BOUTEUR ET DISPOSITIF DE CALAGE POUR BRAS DE RETROCAVAGE

BULLDOZER AND BACKHOE LOCK DEVICE

Abrégé anglais

ABSTRACT
A bulldozer and backhoe locking device for preventing the theft
of heavy equipment having hydraulic piston and cylinder assemblies
by holding an Implement thereof In an extended position and
comprising a cylindrical sleeve of a length to fit the piston
rod of the piston and cylinder assembly in its extended position,
the cylindrical sleeve consisting of a pair of sleeve halves
having oppositely disposed longitudinally extending meeting edges,
half circular portions and an annular flange on one end of the
sleeve halves of a diameter greater than the diameter of the
cylinder of the piston and cylinder assembly, the sleeve halves
being hinged together and having means for locking the sleeve
halves together.
-2-

Revendications

The embodiments of the present invention in which an exclusive
property or privilege is claimed are defined as follows:
1. A locking device for use on a piston rod of a hydraulic piston
and cylinder assembly of a bulldozer, tractor, backhoe, and the like
arranged to hold an implement thereof in an extended position and comprising
a cylindrical sleeve of a length to fit said piston rod in its extended
position, said cylindrical sleeve consisting of a pair of sleeve halves
having oppositely disposed longitudinally extending meeting edges, half
circular portions of an annular flange on one end of said sleeve halves of
a diameter greater than the diameter of the cylinder of said piston and
cylinder assembly, means hinging said sleeve halves to one another and
secondary means for locking said sleeve halves to one another, oppositely
disposed outwardly extending arms on the other end of said cylindrical sleeve
arranged to cover pivoted portions of said bulldozer, tractor, backhoe and
the like.
2. The locking device of Claim 1 wherein said means hinging said
sleeve halves to one another comprises registering pairs of L-shaped
apertured extensions attached to said sleeve halves along one pair of said
oppositely disposed longitudinally extending meeting edges.
3. The locking device of Claim 1 wherein said means for locking said
sleeve halves together comprises registering pairs of apertured lugs secured
to said sleeve halves along one pair of said oppositely disposed longitudinally
extending meeting edges.
4. The locking device set forth in Claim 2 wherein said means for
locking said sleeve halves together comprises registering pairs of apertured
lugs secured to said sleeve halves along the other pair of oppositely
disposed longitudinally extending meeting edges.
-7-

5. The locking device of Claim 1 wherein said oppositely
disposed outwarding extending arms are offset in relation to said
sleeve halves.
-8-

Description

1155311
Background of the Invention
(l) Field of the Invention:
This invention relates to locking devices for use on equipment
havTng hydraulic pistons and cylinders such as bulldozers and back
hoes or the like.
(2) Description of the Prior Art:
Prior art devices have used a number of different safety supports
for holding dump truck beds in up position. See forexample U.S. 3,813,124
of May 28, 1974 to D.H. Roland, 3,157;435 of Nov. 17, 1964 to V. H. Sherven
and 3,135,555 of June 2,.1964 to E. MeCaskey.
In U.S. Patent 3,813,124 a safety prop for dump trucks is shown
wherein an elongated tubular member is pivotally secured at one end
between the truck bed and the truck frame thereby locking the truck
bed in extended or up position.
In U.S. Patent 3,157,435 a safety prop for dump trucks is shown
having a sprtng loaded telescopically extensible tubular member positioned
between the frame and the bottom of the dump bed.
In U.S. Patent 3,135,555 a safety guard is disclosed wherein a
tube is positioned around the rod of a hydraulic piston and cylinder
20 preventing the dump truck bed from falling from the up position while
the truck is being worked on.
In applicant's device a split cylindrical sleeve having an annular
flange at one end and a pair of outwardly extending arms at the other
is positioned over the extended rod portion of a hydraulic piston and
cylinder assembly on the bottom of a back hoe attachment or like equip-
ment to prevent the raising of the same from engagement with the ground
thereby preventing movement of the tractor.
28 Description of the Drawings
-3-

11S~311
Figure 1 is a top plan view of the lock device;
Figure 2 is a cross sectional view on lines 2-2 of Figure 1;
Figure 3 is a detailed elevation on line 3-3 of Figure 2;
Figure 4 7s a side elevation of a back hoe equipped tractor and
illustrating the device;
Figure 5 is a side elevation of a portion of a bulldozer illustra-
ting the device; and
Figure 6 is a perspective view of the lock device in partially
opened position.
Summary of the Invention
A bulldozer and backhoe locking device comprises a split elongated
cylindrical sleeve pivoted together along its one edge and having an
annular flange at one end and a pair of arms extending beyond the
other end thereof. The locking device has apertured lugs to secure
the same over the extended rod portlon of a hydraulic plston and
cyllnder assembly on the blade or boom-portion of the equipment thereby
preventing the moving of the equipment.
Description of the Preferred Embodiment
A bulldozer and backhoe locking device comprising a split cylindrica1
sleeve 10 as will be seen in Figures 1 and 6 of the drawings has equal
half sections 11 and 12 with a pair of pivot hinges 13 therebetween one
of which is seen in Figures 2 and 3 of the drawings. Each of said hinges
13 comprises a pair of offset L-shaped extensions 14 and 15. A pin 16
is positioned through an aperture in said extension 15 and into a bore
in said extension 14. The end of said pin 16 ts secured in said aperture
as by welding. Pairsof apertured lugs 17 and 18 extend from and are
secured to each of said ha1f sections 11 and 12 of said split cylindrical
sleeve 10 opposlte the hinges 13 as seen in Flgures 1 2 and 6 of the

1155311
drawings.
The pairs of lugs 17 and 18 are apertured for p1acement of padlocks
(not shown) therethrough.
Referring to FTgures l and 6 of the drawings, two half circular parts 19 of
an annular flange are formed on one end of said half sections 11 and
12 of satd split cylindrical sleeve 10 while a pair of oppositely dis-
posed outwardly extending arms 20 and 21 are secured adjacent the other
end of said split cylindrical sleeve 10. Each of said arms 20 and 21
have a first portion 22 secured to said half sections 11 and 12 respectively
as by we1ding and an intermediate portion 23 extends outwardly therefrom
on an angle and an end portion 24 in coplanar relation to said first portion
extending beyond the end of said split cylindrical sleeve lO.
Referring now to Figure 4 of the drawings, a backhoe attachment 25
is positioned on a tractor 26 having a pair of booms 27 and 2~, hydraulic
plston and cyltnder assemblles 29 and 30 and a bucket 31 pivotally secured
to one another.
In Figure 5 of the drawings, a portion of a bulldozer 32 is shown
having a blade 33 pivotally secured to said bulldozer and a hydraulic
piston and cyli~der assembly 34 pivotal1y engaged thereon.
To use the locking device lO in the backhoe 25, the hydraulic
cylinder 29 is fully extended exposing the rod portion R. The split
cylindrical sleeve 10 is opened, placed around the rod portion R and
closed locking the rod R in extended position with the annular flange 19
in abutment with the end of the piston and cylTnder assembly 29 providing
distribution of force to the outer wall of the piston and cylinder
assembly 29, engagement of the opposite end of the split cylIndrical
sleeve with the boom 27. The arms 20 and 21 cover a pivot pin connecting
23 the rod R wlth the boom 27 thereby preventing removal of the pin. The

1155311
inner surface of the split cylindrical sleeve 10 is preferably coated
with a siippery material SUCIl as TEFLON*as indicated in Figure 6 of
thc drawings by the letter T. (Tetrafluoroethene homopolymer).
It will thus be seen that with the lockin~ device in place the
boom 27 and the bucket 30 cannot be raised from en~agement with the ground
and thereby prevents the tractor 26 from being moved. T use the locking
device on the bul;dozer 32 as seen in Figure 5 of the drawings, the
hydraulic piston and cylinder assembly 34 is extended forcing the blade
33 against the ground. The split cylindrical sleeve 10 is opened and
placed around the rod R of the hydraulic piston and cylinder assembly
34 to hold the rod R in extended position and the blade 33 in ground engaging
position. With the blade in engagement with the ground, the bulldozer
32 cannot be moved thus effectively securing the e4uipment against un-
au~horized removal. Since the bulIdozer and backhoe and like equipment
have no effective locking means, thelocking device 10 of the above
described invention can greatly reduce the theft of such equipment without
having to modify the equipment in any way.
Additional'ly, the locking device can be used on any manufacturer's
equipment that has comparable hydraulic piston and cylinder assemblies.
The only modification required of the device is to increase or decrease
the overall length and/or diameter to suit the different hyd~raulic
piston and cylinder assemblies to which the device is applied.
It will thus be seen that a new and useful locking device for
bulIdozers and backhoes or the like has been illustrated and
described and it will occur to those skilled in the art that various
changes and modifications may be made therein wit,hout departing from the
spirit of the invention and having thus described my invention what I
28 claim is:
* TEFLON is a registered trademark.
-6-
,