Note: Descriptions are shown in the official language in which they were submitted.
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TELESCOPING JACK FOR LIFTING LARGE CAPACITY TRUCKS
[0001] This application claims priority from United States
Patent Application No. 16/725,991, filed December 23, 2019,
and the entire content of such application is incorporated
herein by reference.
FIELD OF THE APPLICATION
(0002]This application relates to the field of jacks, and more
specifically, to a telescoping jack for lifting large capacity
trucks, such as open pit mining haulage trucks, and the like.
BACKGROUND
(0003]Large capacity open pit mining haulage trucks require
lifting or jacking to replace worn out or flat tires, for
example. Currently, a single lifting ram or cylinder based
jack is typically used for this purpose.
[0004] However, existing single cylinder jacks have several
disadvantages. First, the single cylinder is often heavy and
awkward to handle and as such may cause operator injuries and
strains. Second, the operator typically needs to stand under
the truck while operating the jack and as such the operator
may be injured by falling debris from the undercarriage of the
truck. Third, the operator is typically required to lock the
lifted truck via safety stands or lock collars while
positioned under the lifted truck, which may be dangerous.
Fourth, existing jacks are slow to operate typically requiring
approximately 20 to 30 minutes per lift. Fifth, as typically
only one point or corner is lifted at a time by existing
jacks, the lifted truck or load may become unstable when the
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entire front or rear is lifted at one time. Sixth, existing
jacks are often unstable when subjected to side loading, for
example, when a tire is pulled off the lifted truck. Finally,
the cylinders of existing jacks are typically driven by an
airline which may freeze up in cold climates.
(0005] Under pressure to improve both safety and efficiency
while lifting and securing the largest haulage trucks (e.g.,
up to 400 ton) in the world, mining companies require a safe
and cost effective jack for their truck maintenance needs.
V006,1A need therefore exists for an improved jack for lifting
large capacity trucks and the like. Accordingly, a solution
that addresses, at least in part, the above and other
shortcomings is desired.
SUMMARY OF THE APPLICATION
[0007]According to one aspect of the application, there is
provided a jack, comprising: a top plate adapted to contact a
load; an intermediate plate positioned below the top plate,
the intermediate plate having a channel formed therein; a base
plate positioned below the intermediate plate; a first pair of
actuators coupled between the base plate and the intermediate
plate, one of the first pair of actuators positioned on either
side of the channel; and, a second pair of actuators coupled
between the channel of the intermediate plate and the top
plate; wherein the first and second pairs of actuators are
operable to move the top plate and the intermediate plate
between respective lowered positions and respective raised
positions to thereby lower and raise the load.
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[0008] According to another aspect of the application, there is
provided a jack, comprising: a top plate having at least one
adapter block mounted thereon and adapted to contact a load;
an intermediate plate positioned below the top plate; a base
plate positioned below the intermediate plate; a first pair of
actuators coupled between the base plate and the intermediate
plate; and, a second pair of actuators coupled between
respective lowered portions of the intermediate plate and the
top plate; wherein one of the first pair of actuators is
positioned on the base plate on either side of the respective
lowered portions of the intermediate plate; wherein the first
and second pairs of actuators are operable to move the top
plate and the intermediate plate between respective lowered
positions and respective raised positions to thereby lower and
raise the load; and, wherein a top adapter plate of the at
least one adapter block is operable to slide between first and
second positions on the top plate as the load is raised and
lowered to thereby maintain alignment of the top,
intermediate, and base plates below the load.
[0009]According to another aspect of the application, there is
provided a jack, comprising: a top plate adapted to contact a
load; a base plate positioned below the top plate; at least
one actuator coupled perpendicularly between the base plate
and the top plate; wherein the at least one actuator is
operable to move the top plate between a lowered position and
a raised position to thereby lower and raise the load; and, at
least one locking assembly adapted to lock the top plate in
the raised position; wherein the at least one locking assembly
includes a locking bar and a ratchet rack, the locking bar
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having an upper end and a lower end, the locking bar hinge
mounted at the upper end proximate to the top plate, the
ratchet rack inclining upward from the base plate toward the
top plate and having at least one notch formed therein, the at
least one notch adapted to receive and lock the lower end of
the locking bar, and the lower end of the locking bar slidable
up the ratchet rack and into the at least one notch as the top
plate is moved from the lowered position to the raised
position.
[0010] According to another aspect of the application, there is
provided a locking assembly for a jack, the jack having a top
plate adapted to contact a load, a base plate positioned below
the top plate, and at least one actuator coupled
perpendicularly between the base plate and the top plate and
operable to move the top plate between a lowered position and
a raised position to lower and raise the load, the locking
assembly comprising: a ratchet rack, the ratchet rack
inclining upward from the base plate toward the top plate and
having at least one notch formed therein; and, a locking bar,
the locking bar having an upper end and a lower end, the
locking bar hinge mounted at the upper end proximate to the
top plate; wherein the at least one notch is adapted to
receive and lock the lower end of the locking bar, the lower
end of the locking bar slidable up the ratchet rack and into
the at least one notch as the top plate is moved from the
lowered position to the raised position to thereby lock the
top plate in the raised position.
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BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Features and advantages of the embodiments of the present
application will become apparent from the following detailed
description, taken in combination with the appended drawings,
5 in which:
[0012] FIG. 1 is a front perspective view illustrating a jack in
accordance with an embodiment of the application;
[0013]FIG. 2 is a front view thereof;
[0014] FIG. 3 is a rear view thereof;
[0015] FIG. 4 is a left side view thereof;
[0016]FIG. 5 is a top view thereof;
[0017] FIG. 6 is a bottom view thereof;
(0018] FIG. 7 is a front perspective view illustrating the jack
of FIG. 1 with the front hood and rear hood removed in
accordance with an embodiment of the application;
[0019]FIG. 8 is a top view thereof;
(0020] FIG. 9 is a rear perspective view illustrating the rear
strut, steering, and walking beam assembly of the jack of FIG.
7 in accordance with an embodiment of the application;
[0021] FIG. 10 is a front view thereof with the rear wheels
shown in a retracted position;
[0022]FIG. 11 is a rear view thereof with the rear wheels shown
in an extended position;
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(0023] FIG. 12 is a front perspective view illustrating the main
lifting assembly of the jack of FIG. 1 with the top plate
shown in a lowered position in accordance with an embodiment
of the application;
(0024] FIG. 13 is a front view thereof;
(0025.1FIG. 14 is a left side view thereof;
VI026:1FIG. 15 is a top view thereof;
[0027] FIG. 16 is a front perspective view illustrating the main
lifting assembly of the jack of FIG. 1 with the top plate
shown in a partially raised position in accordance with an
embodiment of the application;
[0028]FIG. 17 is a front view thereof;
Ne29,]FIG. 18 is a left side view thereof;
(0030] FIG. 19 is a top view thereof;
[0031] FIG. 20 is a front perspective view illustrating the main
lifting assembly of the jack of FIG. 1 with the top plate
shown in a fully raised position in accordance with an
embodiment of the application;
(0032] FIG. 21 is a front view thereof;
Nen.IFIG. 22 is a left side view thereof;
(0034] FIG. 23 is a top view thereof;
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N035.1FIG. 24 is a cross-sectional view illustrating the main
lifting assembly of the jack of FIG. 1 taken along line A-A in
FIG. 23, in accordance with an embodiment of the application;
[0036] FIG. 25 is a cross-sectional view illustrating the main
lifting assembly of the jack of FIG. 1 taken along line B-B in
FIG. 23, in accordance with an embodiment of the application;
(0037] FIG. 26 is a front view illustrating one of the compact
spherical bearing cylinder mounts shown in FIG. 24 in
accordance with an embodiment of the application;
[0038]FIG. 27 is a cross-sectional view thereof taken along
line C-C in FIG. 26;
N039.IFIG. 28 is a cross-sectional detail view illustrating the
installation of the spherical bearing cylinder mounts in the
main lifting assembly shown in FIG. 24 taken along line A-A in
FIG. 23;
[0040] FIG. 29 is a left side view illustrating the jack of FIG.
I positioned under the rear lifting point of a truck in
accordance with an embodiment of the application;
[0041] FIG. 30 is a rear view thereof;
[0042] FIG. 31 is a left side view illustrating the jack of FIG.
I positioned under the front lifting point of a truck in
accordance with an embodiment of the application;
[0043]FIG. 32 is a rear view thereof;
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[0044] FIG. 33 is a front perspective view illustrating a main
lifting assembly for the jack of FIG. 1 with the top plate
shown in a lowered position in accordance with another
embodiment of the application;
[0045] FIG. 34 is a front view thereof;
[0046] FIG. 35 is a top view thereof;
[0047] FIG. 36 is a left side view thereof;
[0048] FIG. 37 is a cross-sectional view thereof taken along
line A-A in FIG. 36;
[0049]FIG. 38 is a partially exploded front perspective view
illustrating the main lifting assembly of FIG. 33 in
accordance with an embodiment of the application;
[0050] FIG. 39 is a front view thereof;
[0051] FIG. 40 is a left side view thereof;
[0052] FIG. 41 is a cross-sectional view thereof taken along
line B-B in FIG. 40;
[0053]FIG. 42 is a fully exploded front perspective view
thereof;
[0054]FIG. 43 is a front perspective view illustrating a main
lifting assembly for the jack of FIG. 1 with the top plate
shown in a lowered position and equipped with sliding adapter
blocks and an adapter block mounting plate in accordance with
another embodiment of the application;
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(0055] FIG. 44 is a front view thereof;
[0056] FIG. 45 is a top view thereof;
[0067] FIG. 46 is a left side view thereof;
(0058] FIG. 47 is a partially exploded front perspective view
illustrating the main lifting assembly of FIG. 43 in
accordance with an embodiment of the application;
[0056:1FIG. 48 is a front view thereof;
[0060] FIG. 49 is a front perspective view illustrating one of
the sliding adapter blocks shown in FIG. 43 with the top
adapter plate thereof shown in a first, unloaded, or retracted
position in accordance with an embodiment of the application;
[0061] FIG. 50 is a rear perspective view thereof;
[0062] FIG. 51 is a top view thereof;
[0063:IFIG. 52 is a front view thereof;
(0064] FIG. 53 is a right side view thereof;
(0065] FIG. 54 is a cross-sectional view thereof taken along
line A-A in FIG. 52;
pow FIG. 55 is a bottom perspective view thereof with the top
adapter plate thereof shown in second or rearward position;
[0067] FIG. 56 is a front perspective view thereof;
pow FIG. 57 is a top view thereof;
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(0069] FIG. 58 is a front view thereof;
[0070] FIG. 59 is a right side view thereof;
[0071] FIG. 60 is a cross-sectional view thereof taken along
line A-A in FIG. 58;
5 [0072] FIG. 61 is a bottom perspective view thereof with the top
adapter plate thereof shown in a third or forward position;
(0073] FIG. 62 is a front perspective view thereof;
(0074] FIG. 63 is a top view thereof;
(0075] FIG. 64 is a front view thereof;
10 [0076] FIG. 65 is a right side view thereof;
(0077] FIG. 66 is a cross-sectional view thereof taken along
line A-A in FIG. 64;
[0078] FIG. 67 is an exploded perspective view illustrating one
of the sliding adapter blocks shown in FIG. 43 in accordance
with an embodiment of the application;
[0079] FIG. 68 is bottom perspective view illustrating the top
adapter plate of the sliding block adapter block of FIG. 67 in
accordance with an embodiment of the application;
[00801 FIG. 69 is a rear perspective view thereof;
[0081] FIG. 70 is a top view thereof;
[0082] FIG. 71 is a front view thereof;
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NIMM FIG. 72 is a right side view thereof;
[0084] FIG. 73 is a cross-sectional view thereof taken along
line A-A in FIG. 71;
N085:IFIG. 74 is bottom perspective view illustrating the
bottom adapter plate of the sliding block adapter block of
FIG. 67 in accordance with an embodiment of the application;
(0086] FIG. 75 is a rear perspective view thereof;
[0087] FIG. 76 is a top view thereof;
[0088] FIG. 77 is a front view thereof;
VINg.IFIG. 78 is a right side view thereof;
[0090] FIG. 79 is a cross-sectional view thereof taken along
line A-A in FIG. 77;
(0091]FIG. 80 is a front perspective view illustrating a jack
with the top plate thereof shown in a lowered position in
accordance with another embodiment of the application;
[00921 FIG. 81 is a right side view thereof;
[0093:1FIG. 82 is a rear view thereof;
[0094] FIG. 83 is a front perspective view illustrating the jack
of FIG. 80 with the top plate thereof shown in a raised
position;
[0095:1FIG. 84 is a right side view thereof; and,
[0096] FIG. 85 is a rear view thereof.
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mown It will be noted that throughout the appended drawings,
like features are identified by like reference numerals.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Nom In the following description, details are set forth to
provide an understanding of the application. In some
instances, certain structures, techniques and methods have not
been described or shown in detail in order not to obscure the
application.
N1099] The jack 100 of the present application provides an
integrated truck lifting solution. The jack 100 provides for
reduced truck maintenance costs by reducing the time required
to lift trucks for tire changing, repair, etc. In particular,
according to one embodiment, the present application provides
a jack 100 having a total collapsed height of approximately 33
inches with the ability to lift and extend linearly
approximately 30 inches for a total working extend height of
approximately 63 inches. This allows the jack 100 to fit under
and lift a range of differently sized large capacity open pit
mining haulage trucks 1000. In addition, the jack 100 has
multiple visual secondary mechanical locking assemblies 810,
820, 830, 840 that may support the entire load of a lifted
truck 1000 (e.g., 220 tons or 440,000 lbs, etc.). The
secondary mechanical locking assemblies 810, 820, 830, 840 are
visible to an operator of the jack 100 who may be positioned
at a safe distance away from the truck 1000 as it is lifted.
Furthermore, the jack 100 may be remotely controlled to lift
and lock a truck 1000 using a handheld remote control unit
8000 (see FIG. 80) or the like.
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[00100] The jack 100 is a mobile lifting and looking device
designed to lift and lock in an elevated position, large
capacity trucks including both 300 and 400 ton open pit mining
haulage trucks. Advantageously, the jack 100 will work on both
sizes of trucks. The jack 100 includes a remote control unit
8000 that allows an operator to maneuver the jack 100 under a
truck (or other load) 1000, lift the truck 1000, and lock the
truck 1000 in a raised position (e.g., 1600, 2000) without the
operator having to venture underneath the truck 1000.
10 [00101] .. FIG. 1 is a front perspective view illustrating a
jack 100 in accordance with an embodiment of the application.
FIG. 2 is a front view thereof. FIG. 3 is a rear view thereof.
FIG. 4 is a left side view thereof. FIG. 5 is a top view
thereof. And, FIG. 6 is a bottom view thereof.
15 [00102] According to one embodiment of the application, the
jack 100 may include: a chassis, frame, or base plate 110
having an upper surface 111 and a lower surface 112; a main
lifting assembly 200 mounted on the upper surface 111 of the
base plate 110; first and second retractable front wheels 131,
20 132 mounted to the upper surface 111 of the base plate 110 at
the front end 150, the front wheels 131, 132 movable from a
retracted position 133 as shown in FIGS. 1-6 to an extended
position (not shown); a rear strut, steering, and walking beam
assembly 300 mounted on the upper surface 111 of the base
25 plate 110 at the rear end 160; and, first and second
retractable rear wheels 141, 142 mounted within the rear
strut, steering, and walking beam assembly 300, the rear
wheels 141, 142 movable from a retracted position 143 as shown
in FIG. 10 to an extended position 144 as shown in FIG. 11
=
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(described below). The structural components (e.g., the base
plate 110, the main lifting assembly 200, etc.) of the jack
100 are typically made of metal (e.g., steel, etc.).
[00103] FIG. 7 is a front perspective view illustrating the
jack 100 of FIG. 1 with the front hood 101 and rear hood 301
removed in accordance with an embodiment of the application.
And, FIG. 8 is a top view thereof.
[00104] According to one embodiment, the first and second
retractable front wheels 131, 132 are mounted to right and
left sides 170, 180 of the upper surface 111 of the base plate
110 via respective first and second outrigger arms 731, 732.
The outrigger arms 731, 732 may be controlled to extend and
retract the front wheels 131, 132, either together or
individually. The front wheels 131, 132 are generally extended
when the jack 100 is being positioned under a truck 1000 and
are retracted during lifting of the truck 1000.
[00105] According to one embodiment, the jack 100 may be
self propelled and has mounted on its base plate 110 a diesel
engine 710, fuel tank 720, battery 740, radiator 750, and
hydraulic tank 760 for powering the hydraulic motors (e.g.,
integrated with the outrigger arms 731, 732) associated with
the hydraulically driven front wheels 131, 132 and the
hydraulic cylinders 271, 272, 273, 274 of the main lifting
assembly 200. According to one embodiment, the operation and
positioning of the jack 100 is remotely controllable using a
handheld remote control unit 8000 operated by an operator or
worker.
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[00106] FIG. 9 is a rear perspective view illustrating the
rear strut, steering, and walking beam assembly 300 of the
jack 100 of FIG. 7 in accordance with an embodiment of the
application. FIG. 10 is a front view thereof with the rear
5 wheels 141, 142 shown in a retracted position 143. And, FIG.
11 is a rear view thereof with the rear wheels 141, 142 shown
in an extended position 144.
[00107] According to one embodiment, the rear strut,
steering, and walking beam assembly 300 of the jack 100 may
10 include: a frame 310; a bumper 320 mounted to the frame 310
for protecting the rear wheels 141, 142; a hydraulic cylinder
strut 330 mounted through the upper surface 311 of the frame
310; a walking beam (and axle) 340 coupled to the lower end
the hydraulic cylinder strut 330, the walking beam (and axle)
15 340 in turn being coupled to the rear wheels 141, 142 below
the upper surface 311; and, a hydraulic rotary actuator (e.g.,
capable of 180 degrees of rotation) 350 coupled to the upper
end of the hydraulic cylinder strut 330 above the upper
surface 311 of the frame 310. The hydraulic cylinder strut 330
is operable to move from a retracted position to an extended
position and hence to move the rear wheels 141, 142 from a
retracted position 143 above the lower surface 112 of the base
plate 110 to an extended position 144 below the lower surface
112 of the base plate 110 where the wheels 141, 142 may come
into contact with the ground (or other surface) 1010 for
raising the jack 100 off the ground 1010 in preparation for
movement or repositioning. The hydraulic rotary actuator 350
is operable to rotate the hydraulic cylinder strut 330 and
hence the rear wheels 141, 142 coupled thereto for steering
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the jack 100 during movement or repositioning. The walking
beam (and axle) 340 functions like a suspension arm allowing
horizontal movement of the rear wheels 141, 142 so that both
wheels remain in contact with the ground 1010.
5 [00108] The rear wheels 141, 142, hydraulic cylinder strut
330 and hydraulic rotary actuator 350 provide for smooth 180
degree rotational steering and, according to one embodiment, a
four inch straight vertical lift in the extended position 144.
[00109] According to one embodiment, the jack 100 may be
equipped for hydraulic front wheel direct drive and may
include an electronic differential control system for left and
right steering.
[00110] According to one embodiment, the front
drives/outriggers 731, 732 of the front wheels 131, 132 may
extend and retract approximately four inches which allows the
entire jack 100 to be selectively raised above and lowered to
the ground 1010. The operation of the two front outriggers
731, 732 may be synchronized with the operation of the strut
330 to provide smooth and level lifting and lowering of the
jack 100 which in turn improves alignment of the jack 100 with
the certified lifting points 1020, 1030 of the truck 1000.
[00111] .. FIG. 12 is a front perspective view illustrating the
main lifting assembly 200 of the jack 100 of FIG. 1 with the
top plate 210 (and intermediate plate 230) shown in a lowered
position 1200 in accordance with an embodiment of the
application. FIG. 13 is a front view thereof. FIG. 14 is a
left side view thereof. And, FIG. 15 is a top view thereof.
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[00112] FIG. 16 is a front perspective view illustrating the
main lifting assembly 200 of the jack 100 of FIG. 1 with the
top plate 210 (and intermediate plate 230) shown in a
partially raised position 1600 in accordance with an
embodiment of the application. FIG. 17 is a front view
thereof. FIG. 18 is a left side view thereof. And, FIG. 19 is
a top view thereof.
[00113] FIG. 20 is a front perspective view illustrating the
main lifting assembly 200 of the jack 100 of FIG. 1 with the
top plate 210 (and intermediate plate 230) shown in a fully
raised position 2000 in accordance with an embodiment of the
application. FIG. 21 is a front view thereof. FIG. 22 is a
left side view thereof. And, FIG. 23 is a top view thereof.
[00114] FIG. 24 is a cross-sectional view illustrating the
main lifting assembly 200 of the jack 100 of FIG. 1 taken
along line A-A in FIG. 23, in accordance with an embodiment of
the application. And, FIG. 25 is a cross-sectional view
illustrating the main lifting assembly 200 of the jack 100 of
FIG. 1 taken along line B-B in FIG. 23, in accordance with an
embodiment of the invention.
[00115] According to one embodiment, the main lifting
assembly 200 may include: a base lifting assembly (or frame)
220 mounted on the upper surface 111 of the base plate 110; an
intermediate lifting assembly (or frame) 240 mounted over the
base lifting assembly 220 and coupled (i.e., one or more of
attached, connected, joined, bolted, welded, screwed, pinned,
hinged, etc.) thereto; a top lifting assembly (or frame) 250
mounted over the intermediate lifting assembly 240 and coupled
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thereto; first and second compact spherical bearing cylinder
mounts 410, 420; and, first, second, third, and fourth locking
assemblies 810, 820, 830, 840.
[00116]
According to one embodiment, the base lifting
assembly (or frame) 220 may be mounted on the upper surface
111 of the base plate 110 and may have first and second
telescoping linear guide columns 261, 262 and first and second
main hydraulic lifting cylinders 271, 272 mounted therein.
Each of the first and second main hydraulic lifting cylinders
271, 272 has a piston rod end 276 and a cylinder barrel end
275, the cylinder barrel end 275 of each of the first and
second main hydraulic lifting cylinders 271, 272 may be
mounted on the upper surface 111 of the base plate 110. Each
of the first and second telescoping linear guide columns 261,
262 has a barrel end 263, a first stage end 264, and a second
stage end 265. The barrel end 263 of each of the first and
second telescoping linear guide columns 261, 262 may be
mounted on the upper surface 111 of the base plate 110.
[00117]
According to one embodiment, the intermediate
lifting assembly 240 may have an intermediate plate 230 having
a lower surface 232 and an upper surface 231. The intermediate
plate 230 may have a central channel 234 formed therein. The
left and right portions 233, 235 of the intermediate plate 230
on either side of the channel 234 are at the same level (or
height) while the middle portion or channel 234 of the
intermediate plate is at a lower level (or height). The
intermediate plate 230 may be positioned over and parallel or
approximately parallel to the base plate 110. The lower
surface 232 of the left and right portions 233, 235 of the
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intermediate plate 230 may be coupled to the piston rod ends
276 of the first and second main hydraulic lifting cylinders
271, 272 of the base lifting assembly 220, respectively. The
lower surface 232 of the left and right portions 233, 235 of
the intermediate plate 230 may also be coupled to the first
stage ends 264 of the first and second telescoping linear
guide columns 261, 262, respectively. The upper surface 231 of
the middle portion or channel 234 of the intermediate plate
230 may have third and fourth main hydraulic lifting cylinders
273, 274 mounted thereto. Each of the third and fourth main
hydraulic lifting cylinders 273, 274 has a piston rod end 276
and a cylinder barrel end 275, the cylinder barrel end 275 of
each of the third and fourth main hydraulic lifting cylinders
273, 274 may be mounted on the upper surface 231 of the middle
portion or channel 234 of the intermediate plate 230.
[00118] Advantageously, by using a channelled intermediate
plate 230, the overall height of the main lifting assembly 200
may be reduced.
[00119] According to one embodiment, the top lifting
assembly 250 may have a top plate 210 having a lower surface
212 and an upper surface 211. The top plate 210 may be
positioned over and parallel or approximately parallel to the
intermediate plate 230. The lower surface 212 of the top plate
210 may be coupled to the piston rod end 276 of each of the
third and fourth main hydraulic lifting cylinders 273, 274 of
the intermediate lifting assembly 240 via respective compact
spherical bearing mounts 410, 420 (described below). The lower
surface 212 of the top plate 210 may also be coupled to the
second stage end 265 of each of the first and second
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telescoping linear guide columns 261, 262. The upper surface
211 of the top plate 210 may be adapted for contacting the
lifting points 1020, 1030 of a truck 1000 (or other load).
[00120] .. Referring to FIG. 24, according to one embodiment,
5 the four main hydraulic lifting cylinders 271, 272, 273, 274
operate at 4500 psi hydraulic pressure creating a total
tonnage lift of 220 tons. The main lifting assembly 200 is
designed for the sequenced operation of all four main
hydraulic lifting cylinders 271, 272, 273, 274 when raising,
10 lowering, and maintaining level on off balanced loads. The
main hydraulic lifting cylinders 271, 272, 273, 274 are
connected in series (i.e., daisy chain) to each other, which
together with the structure of the main lifting assembly 200
described above, eliminates or reduces the need for electronic
15 motion control.
[00121] .. Advantageously, the channeled intermediate lifting
plate 230, integrated main hydraulic lifted cylinders 271,
272, 273, 274, and compact spherical bearing mounts 410, 420
combined with the telescoping linear guide columns 261, 262
20 allows for a low profile collapsed height for the jack 100 of
only 33 inches while providing a linear lifting working stroke
of 30 inches. The telescoping linear guide columns 261, 262
provide the required stability to handle a full 220 ton off
balanced load.
25 [00122] According to one embodiment, each of the first,
second, third, and fourth locking assemblies 810, 820, 830,
840 may have an inclined ratchet rack (or plate) 811, a
locking bar 812, and a lock release assembly 850. The ratchet
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rack 811 may be a right-angled triangle (or approximately
right-angled triangle) shaped gusset plate having a horizontal
or approximately horizontal base, a vertical or approximately
vertical side, and a hypotenuse or inclined side. The base of
the ratchet rack 810 is mounted to the upper surface 111 of
the base plate 110 proximate a side (e.g., the left side 180)
of the base plate 110. The vertical side of the ratchet rack
810 may be mounted to the side (e.g., the front side) of the
base lifting assembly (or frame) 220. The ratchet rack 811 may
be built into or function as a gusset plate strengthening the
connection of the base lifting assembly 220 to the base plate
110. The inclined side of the ratchet rack 811 has a number
(e.g., five) of teeth or notches 813 formed therein for
receiving a lower pin or roller 814 of the locking bar 812.
The locking bar 812 may include first and second elongate
plates or members 816, 817 that are coupled and spaced apart
at a lower end 818 by the lower pin or roller 814 and at an
upper end 819 by an upper pin or roller 815. The upper end 819
of the locking bar 812 is pin or hinge mounted (e.g., using
the upper pin or roller 815) to the side (e.g., the front
side) of the top lifting assembly (or frame) 250 allowing the
lower end 818 of the locking bar 812 to swing or rotate
inwards toward the base lifting assembly 220 and outwards away
from the base lifting assembly 220 by rotation about its pin
or hinge.
[00123] Each locking assembly (e.g., 820) is gravity
activated and the notches 813 on the inclined side of the
ratchet rack 811 provides multiple (e.g., seven for five
notches) pre-set locking positions. Advantageously, as each
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locking assembly 820 is externally mounted on the jack 100,
engagement of the locking bars 812 in the ratchet rack 811
remains fully visible to an operator located at a safe
distance from the truck 1000 or load.
(00124] Referring to FIGS. 12-15, when the top plate 210 of
the jack 100 is in a lowered position 1200, for each locking
assembly (e.g., 810), the roller 814 of the locking bar 812 is
positioned below the lowest notch (e.g., the first notch) on
the ratchet rack 811. Referring to FIGS. 16-19, as the top
plate 210 is lifted to a partially raised position 1600, the
roller 814 of the locking bar 812 rolls or slides up the
ratchet rack 811 and is engaged with a higher notch 813 (e.g.,
the third notch) on the ratchet rack 811. Referring to FIGS.
20-23, as the top plate 210 is lifted to a fully raised
position 2000, the roller 814 of the locking bar 812 rolls or
slides further up the ratchet rack 811 and is engaged with a
yet higher notch 813 (e.g., the fifth notch) on the ratchet
rack 811.
[00126] The notches 813 formed in the ratchet rack 811 are
shaped or angled upward to allow the roller 814 of the locking
bar 812 to travel upward over the notches 813 as the top plate
210 is lifted. Advantageously, the upward angling of the
notches 813 prevents the roller 814 of the locking bar 812
from travelling downward over the notches 813 as the top plate
210 is lowered. In this way, gravity is used to lock the
locking bars 812 in position to secure the raised truck 1000
or load.
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[00126] Referring to FIG. 25, to allow the roller 814 of the
locking bar 812 to travel downward over the notches 813 when
the top plate 210 is lowered, each locking assembly (e.g.,
840) is equipped with a lock release assembly 850. The lock
release assembly 850 includes a lock release plate 851 coupled
to a lock release hydraulic cylinder 852. The lock release
plate 851 (e.g., a 1.1 inch plate) has a right-triangle shape
similar to that of the ratchet rack 811. The lock release
hydraulic cylinder 852 is operable to move the lock release
plate 851 from a retracted position 2510 (as shown in FIG. 16)
to an extended position 2520 (as shown in FIG. 25). When moved
to the extended position 2520, the angled side of the lock
release plate 851 extends beyond the angled side of the
ratchet rack 811, contacts the roller 814 of the locking bar
812, urges the roller 814 out of the notch 813 in the ratchet
rack 811, thus allowing the roller 814 and locking bar 812 to
slide downward over the notches 813 in the ratchet rack 811.
[00127] Advantageously, the locking assemblies 810, 820,
830, 840 do not increase the overall height or width of the
base plate 110 of the jack 100 while creating a slide effect
for each locking bar 812.
[00128] According to one embodiment, the main hydraulic
lifting cylinders 271, 272, 273, 274 are arranged in a
straight or approximately straight row extending from the left
side 180 to the right side 170 of the base plate 110 of the
jack 100 with the telescoping liner guide columns 261, 262 on
either end (as shown in FIG. 24).
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[00129] According to one embodiment, each of the main
hydraulic lifting cylinders 271, 272, 273, 274 may be another
type of actuator such as a pneumatic or electric actuator.
[00130] FIG. 26 is a front view illustrating one of the
compact spherical bearing cylinder mounts 410 shown in FIG. 24
in accordance with an embodiment of the application. FIG. 27
is a cross-sectional view thereof taken along line C-C in FIG.
26. And, FIG. 28 is a cross-sectional detail view illustrating
the installation of the compact spherical bearing cylinder
mounts 410, 420 in the main lifting assembly 200 shown in FIG.
24 taken along line A-A in FIG. 23.
[00131] According to one embodiment, each compact spherical
bearing cylinder mount 410, 420 may include: a female
spherical radius cup 411 having a flat outer surface for
mounting on a surface, such as the lower surface 212 of the
top plate 210, and a female spherical radius inner surface (or
bearing); a male spherical radius cup 412 having a male
spherical radius inner surface (or bearing) for mating with
the female spherical radius inner surface of the female
spherical radius cup 411 and a flat outer surface equipped
with a central thread 413 for coupling to a hydraulic cylinder
such as the piston rod end 276 of the third main hydraulic
lifting cylinder 273; and, bolts 414 (or other fasteners) for
loosely coupling the female spherical radius cup 411 to the
male spherical radius cup 412.
[00132] The purpose of the compact spherical bearing
cylinder mounts 410, 420 is to reduce mechanical side loading
on the rods of the main hydraulic lifting cylinders 273, 274.
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The main lifting assembly 200 will typically move or flex when
loads are introduced thus causing an offset linear force on
the main hydraulic lifting cylinders 273, 274 and their rod
assemblies which may result in a hydraulic seal failure and
5 premature oil leakage. The bearings 411, 412 of each compact
spherical bearing cylinder mount 410, 420 mate together in a
manner similar to that of a ball and socket and allow for an
approximately 15 thousands of an inch offset load. The compact
spherical bearing cylinder mounts 410, 420 allow for a very
10 low profile (e.g., approximately one inch) mechanical link
between the main hydraulic lifting cylinders 273, 274 and the
top lifting plate 210. The loose bolting 414 of the female
spherical radius cup 411 to the male spherical radius cup 412
allows for a mechanical link between the hydraulic cylinders
15 273, 274 and the top plate 210 upon retraction or lowering as
well as upon extension or lifting.
[00133] According to one embodiment, the main lifting
assembly 200 may be operated as a stand alone lifting device.
pollq FIG. 29 is a left side view illustrating the jack
20 100 of FIG. 1 positioned under the rear lifting point 1020 of
a truck 1000 in accordance with an embodiment of the
application. FIG. 30 is a rear view thereof. FIG. 31 is a left
side view illustrating the jack 100 of FIG. 1 positioned under
the front lifting point 1030 of a truck 1000 in accordance
25 with an embodiment of the application. FIG. 32 is a rear view
thereof.
[00135] In operation, the jack 100 with its top plate 210
(and intermediate plate 230) in the lowered position 1200 is
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positioned under a lifting point (e.g., the rear lifting point
1020) of a truck 1000 by an operator using a remote control
unit 8000. When positioned, the front and rear wheels 131,
132, 141, 142 of the jack 100 are retracted and the jack 100
is ready for lifting. To lift the truck 1000, the upper
surface 211 of the top plate 210 is brought into contact with
the lifting point 1020 by moving the top plate 210 to a
partially raised position (e.g., 1600) under control of the
operator using a remote control unit 8000. When moving from
the jack's lowered position 1200 to its partially raised
position 1600, the piston rod of each main hydraulic lifting
cylinder 271, 272, 273, 274 is urged out of its respective
cylinder barrel by fluid pressure causing the intermediate
plate 230 and the top plate 210 to be pushed upward to their
respective partially raised positions 1600, the telescoping
linear guide columns 261, 262 to be partially extended, and
the rollers 814 of the locking bars 812 of each of the locking
assemblies 810, 820, 830, 840 to be pulled up their
respective ratchet racks 811 to engage respective notches 813
(e.g., the third notches) to lock the top plate 210 and truck
1000 in place.
[00136] Similarly, when moving from the jack's partially
raised position 1600 to its raised position 2000, the piston
rod of each main hydraulic lifting cylinder 271, 272, 273, 274
is urged further out of its respective cylinder barrel by
fluid pressure causing the intermediate plate 230 and the top
plate 210 to be pushed further upward to their respective
raised positions 2000, the telescoping linear guide columns
261, 262 to be fully extended, and the rollers 814 of the
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locking bars 812 of each of the locking assemblies 810, 820,
830, 840 to be pulled further up their respective ratchet
racks 811 to engage respective notches 813 (e.g., the fifth
notches) to the lock the top plate 210 and truck 1000 in
place.
[00137] After maintenance on the truck 1000 has been
performed, the truck 1000 is ready to be lowered. First, the
lock release hydraulic cylinder 852 of each lock release
assembly 850 is operated to move the lock release plate 851
from its retracted position 2510 to its extended position 2520
allowing the rollers 814 and their locking bars 812 to slide
downward over the notches 813 in their respective ratchet
racks 811. Second, when moving from the jack's raised position
1600 to its lowered position 1200, the piston rod of each main
hydraulic lifting cylinder 271, 272, 273, 274 is urged into
its respective cylinder barrel by fluid pressure causing the
intermediate plate 230 and the top plate 210 to be pulled
downward to their respective lowered positions 2000, the
telescoping linear guide columns 261, 262 to be fully
retracted, and the unlocked locking bars 812 of each of the
locking assemblies 281, 282, 283, 284 to be pushed down their
respective ratchet racks 811 to their lowered positions.
NI0138] Thus, according to one embodiment, there is a
provided a jack 100, comprising: a top plate 210 adapted to
contact a load 1000; an intermediate plate 230 positioned
below the top plate 210, the intermediate plate 230 having a
channel 234 formed therein; a base plate 110 positioned below
the intermediate plate 230; a first pair of actuators 271, 272
coupled between the base plate 110 and the intermediate plate
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230, one of the first pair of actuators 271, 272 positioned on
either side 233, 235 of the channel 234; and, a second pair of
actuators 273, 274 coupled between the channel 234 of the
intermediate plate 230 and the top plate 210; wherein the
first and second pairs of actuators 271, 272, 273, 274 are
operable to move the top plate 210 and the intermediate plate
230 between respective lowered positions (e.g., 1200) and
respective raised positions (e.g., 1600, 2000) to thereby
lower and raise the load 1000.
10 (1010139] The above jack 100 may further include a pair of
telescoping linear guide columns 261, 262 coupled between the
base plate 110, intermediate plate 230, and top plate 210, one
of the pair of telescoping linear guide columns 261, 262
positioned on either side of the first pair of actuators 271,
272. The first and second pairs of actuators 271, 272, 273,
274 may be operable simultaneously. The load may be a truck
1000. The first and second pairs of actuators may be first and
second pairs of hydraulic cylinders 271, 272, 273, 274,
respectively. The first pair of actuators 271, 272, the second
pair of actuators 273, 274, and the pair of telescoping linear
guide columns 261, 262 may be arranged in a row.
[00140] The above jack 100 may further include at least one
locking assembly (e.g., 810) adapted to lock the top plate 210
in the raised position (e.g., 2000). The at least one locking
assembly 810 may include a locking bar 812 and a ratchet rack
811, the locking bar 812 having an upper end 819 and a lower
end 818, the locking bar 812 hinge mounted at the upper end
819 proximate to the top plate 210, the ratchet rack 811
inclining upward from the base plate 110 toward the top plate
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210 and having at least one notch 813 formed therein, the at
least one notch 813 adapted to receive and lock the lower end
818 of the locking bar 812, and the lower end 818 of the
locking bar 812 being slidable up the ratchet rack 811 and
into the at least one notch 813 as the top plate 210 is moved
from the lowered position 1200 to the raised position 1600,
2000. The at least one locking assembly 810 may further
include a lock release assembly 850 adapted to unlock the top
plate 210 allowing the top plate 210 to be moved from the
raised position 1600, 2000 to the lowered position 1200. The
lock release assembly 850 may include a lock release plate 851
inclining upward from the base plate 110 toward the top plate
210, the lock release plate 851 moveable from a retracted
position 2510 to an extended position 2520 to urge the lower
end 818 of the locking bar 812 out of the at least one notch
813 allowing the lower end 818 of the locking bar 812 to slide
down the ratchet rack 811 and over the at least one notch 813
as the top plate 210 is moved from the raised position 1600,
2000 to the lowered position 1200. The locking bar 812, the
ratchet rack 811, and at least one notch 813 are mounted to be
visible from a location distant from the jack 100 and load
1000. The at least one locking assembly 810 may be four
locking assemblies 810, 820, 830, 840. The at least one notch
may be five notches 813.
[00141] The above jack 100 may further include a pair of
spherical radius bearing mounts 410, 420 adapted to couple the
second pair of actuators 273, 274 to the top plate 210,
respectively. The jack 100 may further include a pair of
retractable front wheels 131, 132 mounted proximate to a front
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end 150 of the base plate 110. The pair of retractable front
wheels 131, 132 may be hydraulically driven. The jack 100 may
further include a pair of retractable and steerable rear
wheels 141, 142 mounted proximate to a rear end 160 of the
5 base plate 110.
[00142] The above jack 100 may further include an engine 710
mounted on the base plate 110 for providing power to
components of the jack 100. The jack 100 may further include a
remote control unit 8000 for controlling the jack 100 from a
10 location distant from the jack 100 and load 1000. And, the
jack 100 may further include a base lifting assembly 220
mounted to the base plate 110 within which the first pair of
actuators 271, 272 and the pair of telescoping linear guide
columns 261, 262 are mounted, an intermediate lifting assembly
15 240 within which the second pair of actuators 273, 274 are
mounted, and a top lifting assembly 250 on which the top plate
210 is mounted.
[00143] FIG. 33 is a front perspective view illustrating a
main lifting assembly 200 for the jack 100 of FIG. 1 with the
20 top plate 210 (and intermediate plate 230) shown in a lowered
position 1200 in accordance with another embodiment of the
application. FIG. 34 is a front view thereof. FIG. 35 is a top
view thereof. FIG. 36 is a left side view thereof. And, FIG.
37 is a cross-sectional view thereof taken along line A-A in
25 FIG. 36.
[00144] FIG. 38 is a partially exploded front perspective
view illustrating the main lifting assembly 200 of FIG. 33 in
accordance with an embodiment of the application. FIG. 39 is a
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front view thereof. FIG. 40 is a left side view thereof. FIG.
41 is a cross-sectional view thereof taken along line B-B in
FIG.40. And, FIG. 42 is a fully exploded front perspective
view thereof.
5 [00145] .. According to one embodiment, the main lifting
assembly 200 may include: a base lifting assembly (or frame)
220 mounted on the upper surface 111 of the base plate 110; an
intermediate lifting assembly (or frame) 240 mounted over the
base lifting assembly 220 and coupled thereto; a top lifting
assembly (or frame) 250 mounted over the intermediate lifting
assembly 240 and coupled thereto; compact spherical bearing
cylinder mounts 410, 420; and, first, second, third, and
fourth locking assemblies 810, 820, 830, 840.
(00148] According to one embodiment, the base lifting
assembly (or frame) 220 may be mounted on the upper surface
111 of the base plate 110 and may have first and second main
hydraulic lifting cylinders 271, 272 mounted therein. Each of
the first and second main hydraulic lifting cylinders 271, 272
has a piston rod end 276 and a cylinder barrel end 275. The
cylinder barrel end 275 of each of the first and second main
hydraulic lifting cylinders 271, 272 may be mounted on the
upper surface 111 of the base plate 110.
[00147] .. According to one embodiment, the intermediate
lifting assembly 240 may have an intermediate plate 230 having
a lower surface 232 and an upper surface 231. The intermediate
plate 230 may have left and right lowered portions 2341, 2342
formed therein. The left and right portions 233, 235 of the
intermediate plate 230 on either side of the left and right
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lowered portions 2341, 2342 are at the same level (or height)
while the middle portion or left and right lowered portions
2341, 2342 of the intermediate plate 230 are at a lower level
(or height). Alternatively, the left and right lowered
portions 2341, 2342 may be a single lowered portion 234
similar to that shown in FIG. 24. The intermediate plate 230
may be positioned over and parallel or approximately parallel
to the base plate 110. The lower surface 232 of the left and
right portions 233, 235 of the intermediate plate 230 may be
coupled to the piston rod ends 276 of the first and second
main hydraulic lifting cylinders 271, 272 of the base lifting
assembly 220, respectively, via respective compact spherical
bearing mounts 410, 420. The upper surface 231 of the left and
right lowered portions 2341, 2342 of the intermediate plate
230 may have third and fourth main hydraulic lifting cylinders
273, 274 mounted thereto, respectively. Each of the third and
fourth main hydraulic lifting cylinders 273, 274 has a piston
rod end 276 and a cylinder barrel end 275. The cylinder barrel
end 275 of each of the third and fourth main hydraulic lifting
cylinders 273, 274 may be mounted on the upper surface 231 of
the left and right lowered portions 2341, 2342 of the
intermediate plate 230, respectively.
[00148] Advantageously, by using an intermediate plate 230
having a lowered portion 234 or lowered portions 2341, 2342
formed therein, the overall height of the main lifting
assembly 200 may be reduced.
[00149] According to one embodiment, the top lifting
assembly 250 may have a top plate 210 having a lower surface
212 and an upper surface 211. The top plate 210 may be
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positioned over and parallel or approximately parallel to the
intermediate plate 230. The lower surface 212 of the top plate
210 may be coupled to the piston rod end 276 of each of the
third and fourth main hydraulic lifting cylinders 273, 274 of
the intermediate lifting assembly 240 via respective compact
spherical bearing mounts 410, 420. The upper surface 211 of
the top plate 210 may be adapted for contacting the lifting
points 1020, 1030 of a truck 1000 (or other load) either
directly or via optional sliding adaptor blocks 6100, 6200
mounted to the upper surface 211 of the top plate 210 via an
optional adaptor block mounting plate 5000 as described
further below.
[00150] FIG. 43 is a front perspective view illustrating a
main lifting assembly 200 for the jack 100 of FIG. 1 with the
top plate 210 (and intermediate plate 230) shown in a lowered
position 1200 and equipped with sliding adapter blocks 6100,
6200 and an adapter block mounting plate 5000 in accordance
with another embodiment of the application. FIG. 44 is a front
view thereof. FIG. 45 is a top view thereof. FIG. 46 is a left
side view thereof. FIG. 47 is a partially exploded front
perspective view illustrating the main lifting assembly 200 of
FIG. 43 in accordance with an embodiment of the application.
And, FIG. 48 is a front view thereof.
[00151] The upper surface 211 of the top plate 210 may be
adapted for contacting the lifting points 1020, 1030 of a
truck 1000 (or other load) via sliding adapter blocks 6100,
6200 mounted to the upper surface 211 of the top plate 210 via
an adapter block mounting plate 5000.
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[00152]
The sliding adapter blocks 6100, 6200 are provided
to shift a heavy load (e.g., a 220 ton truck) 1000 while
preventing or reducing any misalignment or bending of the main
lifting assembly 200 of the jack 100 (e.g., misalignment or
bending with respect to the vertical axis of the main lifting
assembly 200 from front 150 to rear 160 (and/or from rear 160
to front 150) of the jack 100). This allows the four locking
bars 812 of the locking assemblies 810, 820, 830, 840 to
function smoothly and effectively and reduces or eliminates
top plate 210 or adapter block 6100, 6200 to load (e.g., truck
body) 1000 contact slippage.
[00153]
According to one embodiment, the adapter block
mounting plate 5000 has an upper surface 5011 upon which one
or more adapter blocks 6100, 6200 are mounted. The lower
surface 5012 of the adapter block mounting plate 5000 is
attached to the upper surface of the top plate 210 of the main
lifting assembly 200. The adapter block mounting plate 5000
may have one or more mounting slots 5100, 5200 formed therein
for receiving and positioning respective adapter blocks 6100,
6200. The mounting slots 5100, 5200 may be positioned
proximate left and right ends of the mounting plate 5000,
respectively, and may extend longitudinally across a portion
of the mounting plate 5000. The mounting slots 5100, 5200
allow the upper surfaces (e.g., 6111) of the adapter blocks
6100, 6200 to be accurately positioned under the lifting
points 1020, 1030 of a truck 1000 (or other load).
polsq
FIG. 49 is a front perspective view illustrating one
of the sliding adapter blocks 6100 shown in FIG. 43 with the
top adapter plate 6110 thereof shown in a first, unloaded, or
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retracted position 7001 in accordance with an embodiment of
the application. FIG. 50 is a rear perspective view thereof.
FIG. 51 is a top view thereof. FIG. 52 is a front view
thereof. FIG. 53 is a right side view thereof. And, FIG. 54 is
5 a cross-sectional view thereof taken along line A-A in FIG.
52.
[00155] FIG. 55 is a bottom perspective view thereof with
the top adapter plate 6110 thereof shown in second or rearward
position 7002. FIG. 56 is a front perspective view thereof.
10 FIG. 57 is a top view thereof. FIG. 58 is a front view
thereof. FIG. 59 is a right side view thereof. And, FIG. 60 is
a cross-sectional view thereof taken along line A-A in FIG.
58.
[00156] FIG. 61 is a bottom perspective view thereof with
15 the top adapter plate 6110 thereof shown in a third or forward
position 7003. FIG.62 is a front perspective view thereof.
FIG. 63 is a top view thereof. FIG. 64 is a front view
thereof. FIG. 65 is a right side view thereof. And, FIG. 66 is
a cross-sectional view thereof taken along line A-A in FIG.
20 64.
[00157] FIG. 67 is an exploded perspective view illustrating
one of the sliding adapter blocks 6100 shown in FIG. 43 in
accordance with an embodiment of the application. FIG. 68 is
bottom perspective view illustrating the top adapter plate
25 6110 of the sliding block adapter block 6100 of FIG. 67 in
accordance with an embodiment of the application. FIG. 69 is a
rear perspective view thereof. FIG. 70 is a top view thereof.
FIG. 71 is a front view thereof. FIG. 72 is a right side view
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thereof. And, FIG. 73 is a cross-sectional view thereof taken
along line A-A in FIG. 71.
(00158] FIG. 74 is bottom perspective view illustrating the
bottom adapter plate 6120 of the sliding block adapter block
6100 of FIG. 67 in accordance with an embodiment of the
application. FIG. 75 is a rear perspective view thereof. FIG.
76 is a top view thereof. FIG. 77 is a front view thereof.
FIG. 78 is a right side view thereof. And, FIG. 79 is a cross-
sectional view thereof taken along line A-A in FIG. 77.
10 (00159] According to one embodiment, each sliding adapter
block (e.g., 6100) may include a top adapter plate 6110
slidably mounted over a bottom adapter plate 6120. The bottom
plate adapter plate 6120 is used for mounting the sliding
adapter block 6100 to the jack 100 (i.e., via the adapter
block mounting plate 5000) and remains stationary with respect
to the jack 100 during operation. A greased NylatronTM sheet
6127 (or any similar nylon, plastic, nylon plastic, or
friction reducing material) may be positioned between the
lower surface 6112 of the top adapter plate 6110 and the upper
surface 6121 of the bottom adapter plate 6120 to improve
slippage (or reduce friction) between the top and bottom
plates 6110, 6120. The sheet 6127 also reduces wear between
the top and bottom adapter plates 6110, 6120. The top adapter
plate 6110 may be coupled to the bottom adapter plate 6120 by
first and second or left and right alignment rods 6150, 6160
which pass through respective holes 6131, 6141 formed in
respective first and second or left and right alignment blocks
6130, 6140 mounted on respective first and second or left and
right sides 6123, 6124 of the upper surface 6121 of the bottom
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adapter plate 6120. A rubber spring 6170 and a washer 6180 may
be mounted on each end of each alignment rod 6150, 6160 and
the top adapter plate 6110 may be attached (e.g., bolted,
etc.) to the end of each alignment rod 6150, 6160 though
respective mating holes 6190 formed in the front and rear
sides 6113, 6114 of the top adapter plate 6110. The alignment
rods 6150, 6160 slide within the holes 6131, 6141 formed in
the alignment blocks 6130, 6140 allowing the top adapter plate
6110 to move or slip on the sheet 6127 over the bottom adapter
plate 6120 and between the alignment blocks 6130, 6140.
[00160] As shown in FIG. 68, according to one embodiment,
the lower surface 6112 of the top adapter plate 6110 extends
downward to contact the greased NylatronTM sheet 6127 on the
upper surface 6121 of the lower adapter plate 6120. As shown
in FIG. 74, the lower surface 6122 of the bottom adapter block
6120 may be equipped with an alignment extrusion 6125 which
mates with a mounting slot (e.g., 5100) of the adapter block
mounting plate 5000. As shown in FIG. 67, the top adapter
plate 6110 may be equipped with handles 6195 for transport,
ease of handling, and positioning. And, also as shown in FIG.
67, a slot 6117 may be formed in the upper surface 6111 of the
top adaptor plate 6110 for the optional mounting of lifting
adapters (not shown).
[00161] In operation, when the jack 100 begins lifting a
load 1000, lateral loading (i.e., from front 150 to rear 160
(and/or from rear 160 to front 150) of the jack 100) causes
the top adapter plate 6110 to slide over the bottom adapter
plate 6120 from a first or unloaded or retracted position 7001
to either a second or rearward position 7002 or a third or
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forward position 7003 depending on the direction of the
lateral loading. The sliding is facilitated by the greased
NylatronTm sheet 6127 positioned between the top and bottom
adapter plates 6110, 6120. This sliding of the top adapter
plate 6110 improves or maintains vertical or approximately
vertical alignment of the main lifting assembly 200 below the
load 1000 which improves the stability of the jack 100. The
rubber springs 6170 function to center the top adapter plate
6110, maintain proportional linear force, and reduce the speed
of lateral shifting of the top adapter plate 6110 over the
bottom adaptor plate 6120. The washers 6180 provide a surface
for the rubber springs 6170 to elastically deform during
shifting of the top adapter plate 6110. The alignment blocks
6130, 6140, alignment rods 6150, 6160 align the top and bottom
adapter plates 6110, 6120 making them function as one unit and
allowing for the top adapter plate 6110 to shift smoothly when
the jack 100 is under lateral loading.
[00162] Thus, according to another embodiment, there is
provided a jack 100, comprising: a top plate 210 having at
least one adapter block (e.g., 6100) mounted thereon and
adapted to contact a load 1000; an intermediate plate 230
positioned below the top plate 210; a base plate 110
positioned below the intermediate plate 230; a first pair of
actuators 271, 272 coupled between the base plate 110 and the
intermediate plate 230; and, a second pair of actuators 273,
274 coupled between respective lowered portions 2341, 2342 of
the intermediate plate 230 and the top plate 210; wherein one
of the first pair of actuators 271, 272 is positioned on the
base plate 110 on either side of the respective lowered
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portions 2341, 2342 of the intermediate plate 230; wherein the
first and second pairs of actuators 271, 272, 273, 274 are
operable to move the top plate 210 and the intermediate plate
230 between respective lowered positions (e.g., 1200) and
respective raised positions (e.g., 1600, 2000) to thereby
lower and raise the load 1000; and, wherein a top adapter
plate 6110 of the at least one adapter block 6100 is operable
to slide between first 7001 and second positions 7002, 7003
on the top plate 210 as the load 1000 is raised and lowered to
thereby maintain alignment of the top, intermediate, and base
plates 210, 230, 110 below the load 1000.
[00163]
In the above jack 100, the at least one adapter
block 6100 may include a bottom adapter plate 6120 attached to
the top plate 210 of the jack 100 and to which the top adapter
plate 6110 is slidably attached. The top adapter plate 6110
may be slidably attached to the bottom adapter plate 6120 by a
pair of alignment rods 6150, 6160 passing through respective
alignment blocks 6130, 6140 mounted on either side 6123, 6124
of the bottom adapter plate 6120, the alignment rods 6150,
6160 may be attached to front and rear ends 6113, 6114 of the
top adapter plate 6110 through respective rubber springs 6170.
The jack 100 may further include a plastic sheet 6127 mounted
between the top and bottom adapter plates 6110, 6120 to reduce
friction between the top and bottom adapter plates 6110, 6120.
The plastic sheet 6127 may be a greased nylon plastic sheet.
[00164]
Also in the above jack 100, the first and second
pairs of actuators 271, 272, 273, 274 may be operable
simultaneously. The load 1000 may be a truck. The first and
second pairs of actuators 271, 272, 273, 274 may be first and
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second pairs of hydraulic cylinders, respectively. The first
and second pairs of actuators 271, 272, 273, 274 may be
arranged in a row.
[00165] The above jack 100 may further include at least one
5 locking assembly (e.g., 810) adapted to lock the top plate 210
in the raised position (e.g., 2000). The at least one locking
assembly 810 may include a locking bar 812 and a ratchet rack
811, the locking bar 812 having an upper end 819 and a lower
end 818, the locking bar 812 hinge mounted at the upper end
10 819 proximate to the top plate 210, the ratchet rack 611
inclining upward from the base plate 110 toward the top plate
210 and having at least one notch 813 formed therein, the at
least one notch 813 adapted to receive and lock the lower end
818 of the locking bar 812, and the lower end 818 of the
15 locking bar 812 slidable up the ratchet rack 811 and into the
at least one notch 813 as the top plate 210 is moved from the
lowered position 1200 to the raised position 1600, 2000. The
at least one locking assembly 810 may further include a lock
release assembly 850 adapted to unlock the top plate 210
20 allowing the top plate 210 to be moved from the raised
position 1600, 2000 to the lowered position 1200. The lock
release assembly 850 may include a lock release plate 851
inclining upward from the base plate 110 toward the top plate
210, the lock release plate 851 moveable from a retracted
25 position 2510 to an extended position 2520 to urge the lower
end 818 of the locking bar 812 out of the at least one notch
813 allowing the lower end 818 of the locking bar 812 to slide
down the ratchet rack 811 and over the at least one notch 813
as the top plate 210 is moved from the raised position 1600,
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2000 to the lowered position 1200. The locking bar 812, the
ratchet rack 811, and the at least one notch 813 are mounted
to be visible (e.g., from a location distant from the jack 100
and load 1000). The at least one locking assembly 810 may be
four locking assemblies 810, 820, 830, 840. The at least one
notch 813 may be five notches.
[00166] The above jack 100 may further include respective
pairs of spherical radius bearing mounts 410, 420 adapted to
couple the first pair of actuators 271, 272 to the
intermediate plate 230 and the second pair of actuators 273,
274 to the top plate 210. The jack 100 may further include: a
pair of retractable front wheels 131, 132 mounted proximate to
a front end 150 of the base plate 110, the pair of retractable
front wheels 131, 132 may be hydraulically driven; a pair of
retractable and steerable rear wheels 141, 142 mounted
proximate to a rear end 160 of the base plate 110; and, an
engine 710 mounted on the base plate 110 for providing power
to components of the jack 100. The jack 100 may be remotely
controllable (e.g., from a location distant from the jack 100
and load 1000 via a remote control unit 8000). And, the jack
100 may further include a base lifting assembly 220 mounted to
the base plate 110 within which the first pair of actuators
271, 272 are mounted, an intermediate lifting assembly 240
within which the second pair of actuators 273, 274 are
mounted, and a top lifting assembly 250 on which the top plate
110 is mounted.
[00167] According to one embodiment, the compact spherical
bearing cylinder mounts 410, 420 may be optional. According to
one embodiment, one or more of: the first pair of actuators
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271, 272 are directly (i.e., without intervening components,
linkage arms, etc.) coupled (e.g., one or more of attached,
connected, joined, bolted, welded, screwed, pinned, hinged,
etc.) between the base plate 110 and the intermediate plate
230; and, the second pair of actuators 273, 274 are directly
(i.e., without intervening components, linkage arms, etc.)
coupled (e.g., one or more of attached, connected, joined,
bolted, welded, screwed, pinned, hinged, etc.) between
respective lowered portions 2341, 2342 of the intermediate
plate 230 and the top plate 210. According to one embodiment,
one or more of: the first pair of actuators 271, 272 are
coupled perpendicularly or approximately perpendicularly
between the base plate 110 and the intermediate plate 230;
and, the second pair of actuators 273, 274 are coupled
perpendicularly or approximately perpendicularly between
respective lowered portions 2341, 2342 of the intermediate
plate 230 and the top plate 210. According to one embodiment,
the engine 710 may be an electric motor which may be powered
by the battery 740.
20 [00168] .. FIG. 80 is a front perspective view illustrating a
jack 100 with the top plate 210 thereof shown in a lowered
position 1200 in accordance with another embodiment of the
application. FIG. 81 is a right side view thereof. FIG. 82 is
a rear view thereof. FIG. 83 is a front perspective view
illustrating the jack 100 of FIG. 80 with the top plate 210
thereof shown in a raised position 2000. FIG. 84 is a right
side view thereof. And, FIG. 85 is a rear view thereof.
[00169] According to one embodiment of the application, the
jack 100 may include: a chassis, frame, or base plate 110
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having an upper surface 111 and a lower surface 112; a main
lifting assembly (or frame) 200 mounted on the upper surface
111 of the base plate 110; first and second front wheels 131,
132 mounted to the base plate 110 at the front end 150; and,
at least one rear wheel 141 mounted to the base plate 110 at
the rear end 160. As further described below, the jack 100 of
this embodiment may include a single (or at least one)
hydraulic lifting cylinder (or actuator) 271 mounted between
the base plate 110 and the top plate 210. Note that the
portion of the cylinder barrel end 275 of the hydraulic
lifting cylinder 271 covered by the main lifting assembly 200
of the jack 100 is shown in broken lines in FIGS. 81 and 84.
[00170] According to one embodiment, the jack 100 may be
self propelled and has mounted on its base plate 110 an
electric motor (or optionally a diesel engine) 710 and battery
740 for powering the front wheels 131, 132 and the hydraulic
lifting cylinder 271 of the main lifting assembly 200. The
rear wheel 141 may provide for smooth 180 degree (or
approximately 180 degree) rotational steering. According to
one embodiment, the operation and positioning of the jack 100
is remotely controllable using a handheld remote control unit
8000 operated by an operator or worker.
[00171] According to one embodiment, the main lifting
assembly 200 may include: a top plate 210 having an upper
surface 211 and a lower surface 212, the top plate 210
positioned over and parallel or approximately parallel to the
base plate 110; at least one hydraulic lifting cylinder 271
having a piston rod end 276 and a cylinder barrel end 275, the
cylinder barrel end 275 of the lifting cylinder 271 may be
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mounted on the upper surface 111 of the base plate 110, the
piston rod end 276 of the lifting cylinder 271 may be coupled
(i.e., one or more of attached, connected, joined, bolted,
welded, screwed, pinned, hinged, etc.) to the lower surface
212 of the top plate 210; and, first and second locking
assemblies 810, 820. The upper surface 211 of the top plate
210 may be adapted for contacting one or more lifting points
1020, 1030 of a truck (or other load) 1000.
(00172] According to one embodiment, the lower surface 212
of the top plate 210 may be coupled to the piston rod end 276
of the at least one hydraulic lifting cylinder 271 via
respective compact spherical bearing mounts 410 (as described
above). According to one embodiment, the top plate 210 may
have at least one adapter block 6100 (as described above)
mounted thereon and adapted to contact the load 1000.
According to one embodiment, the at least one hydraulic
lifting cylinder 271 may be another type of actuator such as a
pneumatic or electric actuator.
[00173] According to one embodiment, each of the first and
second locking assemblies 810, 820 may have an inclined
ratchet rack (or plate) 811, a locking bar 812, and a lock
release assembly 850. The ratchet rack 811 may be a right-
angled triangle (or approximately right-angled triangle)
shaped gusset plate having a horizontal or approximately
horizontal base, a vertical or approximately vertical side,
and a hypotenuse or inclined side. The base of the ratchet
rack 810 is mounted to the upper surface 111 of the base plate
110 proximate a side (e.g., the right side 170) of the base
plate 110. The vertical side of the ratchet rack 810 may be
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mounted to the side (e.g., the front side) of the main lifting
assembly (or frame) 200. The ratchet rack 811 may be built
into or function as a gusset plate strengthening the
connection of the main lifting assembly 200 to the base plate
5 110. The inclined side of the ratchet rack 811 has a number
(e.g., three) of teeth or notches 813 formed therein for
receiving a lower pin or roller 814 of the locking bar 812.
The locking bar 812 may include first and second elongate
plates or members 816, 817 that are coupled and spaced apart
10 at a lower end 818 by the lower pin or roller 814 and at an
upper end 819 by an upper pin or roller 815. The upper end 819
of the locking bar 812 is pin or hinge mounted (e.g., using
the upper pin or roller 815) to the side (e.g., the front
side) of the top plate 210 allowing the lower end 818 of the
15 locking bar 812 to swing or rotate inwards toward the main
lifting assembly 200 and outwards away from the main lifting
assembly 200 by rotation about its pin or hinge.
[00174] Each locking assembly (e.g., 810) is gravity
activated and the notches 813 on the inclined side of the
20 ratchet rack 811 provides multiple (e.g., five for three
notches) pre-set locking positions. Advantageously, as each
locking assembly 810 is externally mounted on the jack 100,
engagement of the locking bars 812 in the ratchet rack 811
remains fully visible to an operator located at a safe
25 distance from the truck or load 1000.
[00175] Referring to FIGS. 80-82, when the top plate 210 of
the jack 100 is in a lowered position 1200, for each locking
assembly (e.g., 810), the roller 814 of the locking bar 812 is
positioned below the lowest notch (e.g., the first notch) on
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the ratchet rack 811. Referring to FIGS. 83-85, as the top
plate 210 is lifted to a fully raised position 2000, the
roller 814 of the locking bar 812 rolls or slides up the
ratchet rack 811 and is engaged with a higher notch 813 (e.g.,
the fifth notch) on the ratchet rack 811.
[00176] The notches 813 formed in the ratchet rack 811 are
shaped or angled upward to allow the roller 814 of the locking
bar 812 to travel upward over the notches 813 as the top plate
210 is lifted. Advantageously, the upward angling of the
notches 813 prevents the roller 814 of the locking bar 812
from travelling downward over the notches 813 as the top plate
210 is lowered. In this way, gravity is used to lock the
locking bars 812 in position to secure the raised truck or
load 1000.
15 [00177] To allow the roller 814 of the locking bar 812 to
travel downward over the notches 813 when the top plate 210 is
lowered, each locking assembly (e.g., 810) is equipped with a
lock release assembly 850 as shown in FIG. 25 and as described
above.
[00178] In operation, the jack 100 with its top plate 210 in
the lowered position 1200 is positioned under a lifting point
(e.g., the rear lifting point 1020) of a truck 2.000 by an
operator using a remote control unit 8000. To lift the truck
1000, the upper surface 211 of the top plate 210 is brought
into contact with the lifting point 1020 by moving the top
plate 210 to a partially raised position under control of the
operator using the remote control unit 8000. When moving from
the jack's lowered position 1200 to its partially raised
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position, the piston rod of the at least one hydraulic lifting
cylinder 271 is urged out of its cylinder barrel by fluid
pressure causing the top plate 210 to be pushed upward to its
partially raised position, and the rollers 814 of the locking
bars 812 of each of the locking assemblies 810, 820 to be
pulled up their respective ratchet racks 811 to engage
respective notches 813 (e.g., the first or second notches) to
lock the top plate 210 and truck 1000 in place.
[00179] Similarly, when moving from the jack's partially
raised position to its raised position 2000, the piston rod of
the at least one hydraulic lifting cylinder 271 is urged
further out of its respective cylinder barrel by fluid
pressure causing the top plate 210 to be pushed further upward
to its raised position 2000, and the rollers 814 of the
locking bars 812 of each of the locking assemblies 810, 820 to
be pulled further up their respective ratchet racks 811 to
engage respective notches 813 (e.g., the third notches) to the
lock the top plate 210 and truck 1000 in place.
[00180] After maintenance on the truck 1000 has been
performed, the truck 1000 is ready to be lowered. First, the
lock release hydraulic cylinder 852 of each lock release
assembly 850 is operated to move the lock release plate 851
from its retracted position 2510 to its extended position 2520
allowing the rollers 814 and their locking bars 812 to slide
downward over the notches 813 in their respective ratchet
racks 811. Second, when moving from the jack's raised position
2000 to its lowered position 1200, the piston rod of the at
least one hydraulic lifting cylinder 271 is urged into its
cylinder barrel by fluid pressure causing the top plate 210 to
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be pulled downward to its lowered positions 1200, and the
unlocked locking bars 812 of each of the locking assemblies
810, 820 to be pushed down their respective ratchet racks 811
to their lowered positions.
[00181] According to one embodiment, at least one of the
compact spherical bearing cylinder mount 410 and the adapter
block 6100 may be optional. According to one embodiment, the
at least one actuator 271 is directly (i.e., without
intervening components, linkage arms, etc.) coupled (e.g., one
or more of attached, connected, joined, bolted, welded,
screwed, pinned, hinged, etc.) between the base plate 110 and
the top plate 210. According to one embodiment, the at least
one actuator 271 is coupled perpendicularly or approximately
perpendicularly between the base plate 110 and the top plate
210.
[00182] Thus, according to another embodiment, there is
provided a jack 100, comprising: a top plate 210 adapted to
contact a load 1000; a base plate 110 positioned below the top
plate 210; at least one actuator 271 coupled perpendicularly
between the base plate 110 and the top plate 210; wherein the
at least one actuator 271 is operable to move the top plate
210 between a lowered position 1200 and a raised position 2000
to thereby lower and raise the load 100; and, at least one
locking assembly (e.g., 810) adapted to lock the top plate 210
in the raised position 2000; wherein the at least one locking
assembly 810 includes a locking bar 812 and a ratchet rack
811, the locking bar 812 having an upper end 819 and a lower
end 818, the locking bar 812 hinge mounted at the upper end
819 proximate to the top plate 210, the ratchet rack 811
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inclining upward from the base plate 110 toward the top plate
210 and having at least one notch 813 formed therein, the at
least one notch 813 adapted to receive and lock the lower end
818 of the locking bar 812, and the lower end 818 of the
locking bar 812 slidable up the ratchet rack 811 and into the
at least one notch 813 as the top plate 210 is moved from the
lowered position 1200 to the raised position 2000.
[00183] In the above jack 100, the at least one locking
assembly 810 may further include a lock release assembly 850
adapted to unlock the top plate 210 allowing the top plate 210
to be moved from the raised position 2000 to the lowered
position 1200. The lock release assembly 850 may include a
lock release plate 851 inclining upward from the base plate
110 toward the top plate 210, the lock release plate 851
moveable from a retracted position 2510 to an extended
position 2520 to urge the lower end 818 of the locking bar 812
out of the at least one notch 813 allowing the lower end 818
of the locking bar 812 to slide down the ratchet rack 811 and
over the at least one notch 813 as the top plate 210 is moved
from the raised position 2000 to the lowered position 1200.
The locking bar 812, the ratchet rack 811, and the at least
one notch 813 may be mounted to be visible. The at least one
locking assembly 810 may be two locking assemblies 810, 820.
The at least one notch may be three notches. The jack 100 may
further include a remote control unit 8000 for remotely
controlling operations of the jack 100. The jack 100 may
further include a pair of front wheels 131, 132 mounted
proximate to a front end 150 of the base plate 110 and at
least one rear wheel 141 mounted proximate to a rear end 160
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of the base plate 110. The jack 100 may further include a
battery 740 mounted on the base plate 110 for providing power
to components of the jack 100. The jack 100 may be remotely
controllable. The load may be a truck 1000. And, the at least
5 one actuator 271 may be at least one hydraulic cylinder 271.
[00184] The above embodiments may contribute to an improved
telescoping jack 100 for lifting large capacity trucks 1000
and may provide one or more advantages. First, the jack 100
may be used on trucks made by multiple manufacturers such as
10 CaterpillarTM, KomatsuTM, and LiebherrTM and may accommodate
their proprietary specifications such as lifting points,
lifting methods, and height restrictions. Second, the jack 100
may be used on trucks of different physical sizes as it has a
width that may fit under the smallest truck but yet still may
15 balance the load of the largest truck. This reduces the need
for two or more different jacks to handle differently sized
trucks and hence provides for cost savings. Third, the jack
100 conforms to mine specific, country specific, and culture
specific safety protocols while accommodating any custom
20 aftermarket "add-ons" to the trucks provided by the above-
mentioned truck manufacturers. Fourth, the jack 100 may be
used in high altitude applications. Fifth, the jack 100 fits
under the front of most trucks to reach the manufacturer's
certified lifting points. Sixth, the jack 100 has sufficient
25 working stroke to lift the front tires of a truck off the
ground. Seventh, the jack 100 requires only a single lift or
operation to lift the front or rear end of a truck. Eighth,
the jack 100 does not require the use of a separate safety
stand or other means required by existing "double lift" jacks.
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Ninth, the jack 100 may complete a two-point lift in
approximately 10 minutes. Tenth, at approximately 7 tons and
with approximately 72 square feet of ground contact with the
wheels 131, 132, 141, 142 retracted, the jack 100 acts as
effective safety stand and requires no additional safety
stands. Eleventh, the jack 100 may be used as a multi-lifting
device for lifting skid plates, undercarriage components, and
the like. Twelfth, the jack 100 is user friendly and its
remote control unit 8000 reduces or eliminates the risk of
operator injury. Thirteenth, the jack 100 is designed to lift
at O.E.M. recommended truck lifting points 1020, 1030 and
provides for easy front and rear access under a truck 1000.
Fourteenth, using the jack 100 of the present application, a
mining operation improve per truck utilization by up to 815
hours in a 48-month period. Fifteenth, the jack 100 has a low
profile with an overall collapsed height of approximately 33
inches while still achieving a very difficult linear lifting
stroke of approximately 30 inches without using a scissor lift
(the jack 100 not being of the scissor lift type) or
telescoping hydraulic cylinders. And, sixteenth, the jack 100
has multiple pre-set position (e.g., five, seven, etc.)
gravity activated secondary mechanical locking assemblies 810,
820, 830, 840 that provide a visual indication of load locking
to an operator from a safe working distance.
VI0185] The embodiments of the application described above
are intended to be exemplary only. Those skilled in this art
will understand that various modifications of detail may be
made to these embodiments, all of which come within the scope
of the application.
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