Note: Descriptions are shown in the official language in which they were submitted.
CANADIAN PATENT APPLICATION
TITLE: INDUSTRIAL CART COMPRISING A MOTHER OR PRIMARY
CART AND A SECONDARY OR DAUGHTER CART
FIELD OF THE INVENTION
[0001] The present invention relates to industrial cart systems, and
more
particularly, to industrial cart comprising a mother or primary cart and a
secondary or daughter cart.
BACKGROUND OF THE INVENTION
[0002] In the art, forklifts have traditionally been used to deliver or
move
materials, for example, palletized loads, or loads contained in bins, in a
factory
or other industrial plant. For a variety of reasons, including safety
concerns,
plants have been moving to being "forklift free" or substantially forklift
free.
[0003] The movement of materials or parts and/or material containers in
a
plant is typically done using automated guided vehicles ("AGV") or a man-on-
board system or a combination of both. In a typical man-on-board system, the
material or components are moved in plant using a train of carts, and a human
operator unloads the carts and removes empty carts. Because a human
operator is involved, there will be limits on the size and/or weight of loads
and/or
cart configurations that can be handled, for example, based on a safety and/or
physical handling considerations.
[0004] Accordingly, there remains a need for improvements in the art.
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BRIEF SUMMARY OF THE INVENTION
[0005] The
present invention is directed to an industrial cart system
comprising a mother and daughter configuration. According to an exemplary
implementation or application one or more mother/daughter cart units are
coupled together and moved through an industrial plant by a tractor or other
drive mechanism. The daughter cart is disengageable from the associated
mother cart and is offloaded or disengaged, for example, to deliver parts,
components or other materials, at a work station or assembly station in the
plant. The empty daughter cart is loaded back onto the mother cart and moved.
[0006] According to another exemplary implementation or embodiment, a
method or process is provided comprising coupling one or more
mother/daughter cart units together and moving the coupled mother/daughter
cart units through an industrial plant utilizing a tractor, or a drive
mechanism
integrated with the industrial plant, for delivery of parts, components or
other
materials, or removal or transfer of parts, components or other materials, at
or
from one or more work stations or assembly stations in the industrial plant.
[0007] According to one aspect, the present invention comprises a mother
cart suitable for transporting a daughter cart, the mother cart comprises: a
base
frame, the base frame includes a plurality of wheels configured to allow the
mother cart to be moved; the base frame includes a loading bay for receiving
the daughter cart, and a support surface for supporting the daughter cart; and
the base frame has a primary restraint mechanism for engaging and securing
the daughter cart in the loading bay.
[0008] According to another aspect, the present invention comprises a
mother cart suitable for transporting a daughter cart, the mother cart
comprises
a base frame and the base frame comprises a substantially C-shape structure
with an open side, and the open side defining a loading bay for receiving the
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daughter cart; the base frame including a support surface for supporting the
daughter cart; the base frame having a primary restraint mechanism for
engaging and securing the daughter cart in said loading bay; and the base
frame further including one or more anti-splay receptacles, the anti-splay
receptacles being configured for engaging a corresponding anti-splay member
on the daughter cart so as to reduce splaying of the open side of the C-shape
structure.
[0009]
According to another aspect, the present invention comprises an
industrial parts delivery system comprising two or more mother carts coupled
together to form a train of carts, and one of said mother carts being
configured
to be coupled to a tractor; the mother cart comprises, a base frame and the
base frame comprising a substantially C-shape structure with an open side, and
the open side defining a loading bay for receiving the daughter cart; the base
frame including a support surface for supporting the daughter cart; the base
frame having a primary restraint mechanism for engaging and securing the
daughter cart in the loading bay; and the base frame further including one or
more anti-splay receptacles, the anti-splay receptacles being configured for
receiving a corresponding anti-splay member on the daughter cart so as to
reduce splaying of the open side of the C-shape structure.
[00010] Other aspects and features of the present invention will become
apparent to those ordinarily skilled in the art upon review of the following
description of embodiments of the invention and/or the accompanying figures.
BRIEF DESCRIPTION OF THE DRAWINGS
[00011] Reference will now be made to the accompanying drawings which
show, by way of example, embodiments of the present invention, and in which:
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[00012] Fig. 1A shows in diagrammatic form a mother or primary cart
according to an embodiment of the present invention;
[00013] Fig. 1B shows a mother cart according to another embodiment of the
present invention shown with a daughter or secondary cart in the engaged or
loaded position or configuration;
[00014] Fig. 2A shows a daughter cart according to an embodiment of the
present invention;
[00015] Fig. 2B shows a bottom view of the daughter cart of Fig. 2A according
to an embodiment of the invention;
[00016] Fig. 2C shows a front view of the daughter cart of Fig. 2A;
[00017] Fig. 2D shows a top view of the daughter cart of Fig. 2A;
[00018] Fig. 2E shows a side view of the daughter cart of Fig. 2A;
[00019] Fig. 3A shows a side view of the mother cart of Fig. 1B with the
daughter or secondary cart in the engaged or loaded position;
[00020] Fig. 3B is a top view of the mother cart and daughter cart of Fig. 3A;
[00021] Fig. 3C is a side view of the base frame of the mother cart with the
daughter cart in a loaded or engaged position and raised above the floor taken
through section line A-A in Fig. 3A;
[00022] Fig. 3D shows a perspective view of the mother cart of Fig. 3A with
the daughter or secondary cart in the engaged or loaded position;
[00023] Fig. 4 shows a top view of a mother and daughter coupled in a train
arrangement and depicted in a turning layout;
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[00024] Fig. 5A shows in diagrammatic form a "left-hand" configured mother
or primary cart according to another embodiment of the present invention;
[00025] Fig. 5B shows a "right-hand" configured mother cart according to
another embodiment of the present invention shown with a full daughter or
secondary cart in the engaged or loaded position or configuration;
[00026] Fig. 6A shows the mother cart of Fig. 5B configured with a three-
quarter or a sectional daughter cart according to an embodiment of the present
invention;
[00027] Fig. 6B shows a front view of the mother cart of Fig. 6A with the
sectional daughter or secondary cart in the engaged or loaded position or
configuration (i.e. raised or travel position);
[00028] Fig. 60 shows a top view of the mother and daughter cart of Fig. 6A;
[00029] Fig. 6D shows a side view of the mother and daughter cart of Fig. 6A
taken along section line B-B in Fig. 6B;
[00030] Fig. 7A shows the mother cart of Fig. 5A configured with a full
daughter cart according to an embodiment of the present invention;
[00031] Fig. 7B shows a front view of the mother cart of Fig. 7A with the
daughter or secondary cart in the engaged or loaded position or configuration
(i.e. raised or travel position);
[00032] Fig. 70 shows a top view of the mother and daughter cart of Fig. 7A;
[00033] Fig. 7D shows a side view of the mother and daughter cart of Fig. 7A
taken along section line A-A in Fig. 7B;
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[00034] Fig. 8 shows the mother cart of Fig. 1A with an anti-splay mechanism
according to another embodiment of the invention;
[00035] Fig. 9A shows a perspective view of a three-quarter or sectional
daughter cart according to an embodiment of the present invention;
[00036] Fig. 9B shows a front view of the daughter cart of Fig. 9A;
[00037] Fig. 90 shows a top view of the daughter cart of Fig. 9A; and
[00038] Fig. 9D shows a side view of the daughter cart of Fig. 9A.
[00039] In the drawings, like reference numerals indicated like components or
elements.
DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION
[00040] Reference is first made to Fig. 1A, which shows a mother or primary
cart according to an embodiment of the present invention and indicated
generally by reference 100. The mother or primary cart 100 is configured to
carry or transport a daughter or secondary cart indicated generally by
reference
200 as shown in Fig. 1B. The mother cart 100 in Fig. 1A is configured for
"left-
hand" or left-side loading, and the mother cart indicated by reference 101 in
Fig.
1B is configured for "right-hand" or right-side loading, as will be described
in
more detail below. The daughter cart 200 may take various forms, some of
which are described in more detail below, and is generally configured to carry
a
load, for example, automotive components or parts in a bin or other container.
[00041] As shown in Fig. 1A, the mother or primary cart 100 comprises a base
frame 110. The base frame 110 includes a tow bar 112 and a hitch 114, which
are configured to couple to respective front or rear mother carts to form a
train,
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for example, as depicted in Fig. 4 and indicated by references 400a and 400b.
The mother cart 100 includes a push handle 116 which is connected to the front
of the base frame 110, and allows an operator to manually move or position the
cart 100. The mother cart 100 may also include one or more whip flags 118,
indicated individually by references 118a and 118b. As shown, the base frame
110 is configured with a primary restraint mechanism 120 and a secondary
restraint mechanism 130. The primary 120 and secondary 130 restraint
mechanisms are configured to further secure the daughter cart 200 to the
mother cart 100, as described in more detail below. According to an
embodiment, the mother cart 100 is configured with fork-lift pockets 140. Two
fork lift pockets 140a and 140b are connected or affixed to the rear section
of
the base frame 110, and two corresponding (i.e. aligned with respective fork
lift
pockets 140a and 140b) fork lift pockets 140c and 140d are connected or
affixed to the front section of the base frame 110 as shown in Fig. 1A. The
mother cart 100 can be lifted or moved by inserting a fork into each pair of
respective forklift pockets 140a, 140c and 140b, 140d. According to an
embodiment, the mother cart is configured with four castors or wheels 150,
indicated individually by references 150a, 150b, 150c and 150d.
[00042] As also shown in Fig. 1A, the mother cart 100 is configured with a
daughter cart loading bay or slot, indicated generally by reference 160. The
loading bay or slot 160 is configured to receive and support the daughter cart
200 on the base frame 110 of the mother cart 100. According to an
embodiment, the base frame 110 comprises a generally C-Frame configuration
with the loading bay or slot 160 in the open side of the base frame 110.
According to an exemplary implementation, the mother cart 100 is configured
for left hand or left side loading of the daughter cart as shown in Fig. 1A.
The
mother cart can also be configured for right hand or right side loading of the
daughter cart 200 as shown in Fig. 1B and indicated generally by reference
101.
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[00043] Reference is next made to Figs. 2A and 2B, which shows an
embodiment of the daughter cart 200 according to an embodiment of the
present invention. The daughter cart 200 comprises a base frame indicated
generally by reference 210. The base frame 210 includes a deck or support
surface 220. The deck 220 may comprise a flat surface as shown for loading
and transporting a bin or other container on the daughter cart 200. According
to
an exemplary implementation, the deck 220 can include corner brackets 222,
indicated individually by references 222a, 222b, 222c and 222d, for further
securing a bin or other container on the deck 220. As shown, the daughter cart
200 includes one or more push handles 212, indicated individually by
references
212a and 212b, in Figs. 2A and 2C. The push handles 212a, 212b are connected
or attached to the base frame 210 of the daughter cart 200 and allow an
operator to move the daughter cart 200 on/off the mother cart 200 or otherwise
maneuver the cart 200 in a plant or application. As shown in Fig. 2B, the
daughter cart 200 is configured with four wheels or castors 230, indicated
individually by references 230a, 230b, 230c and 230d. The wheels 230 are
connected or attached to the base frame 210 of the daughter cart 200, which
can comprise one or more cross-members 211 connected to the outer or
perimeter frame 213 of the base frame 210. According to an exemplary
implementation, the wheels or castors 230 are configured in a "diamond"
arrangement, which provides a tight turning radius for turning and maneuvering
the daughter cart 200.
[00044] As shown in Figs. 2A and 20, the daughter cart 200 may also include
a daughter cart floor lock indicated by reference 214. The cart lock 214 is
affixed
or connected to the daughter cart base frame 210 and is configured to secure
the daughter cart 200 against the floor and prevent the mother/daughter cart
from rolling. According to an exemplary implementation, the cart lock 214
comprises a vertical stop 240 that is moved down with an actuator 242, for
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example, a foot-activated actuator, to secure the cart 200 against the plant
floor
or work surface, and moved up with actuator 242 to release the stop 240.
[00045] Referring still to Figs. 2A and 2C, the base frame 210 for the
daughter
cart 200 also includes a locking hoop or ring indicated by reference 216. The
hoop 216 is engaged by the primary restraint mechanism 120 (Figs. 1A and 1B)
on the mother cart 100 to secure the daughter cart 200 when loaded on the
mother cart 100, as will be described in more detail below.
[00046] As also shown in Figs. 2A and 2B, the daughter cart 200 includes an
anti-splay mechanism 217. According to one embodiment, the anti-splay
mechanism 217 comprises anti-splay pins or members 218, indicated
individually by references 218a and 218b, and corresponding anti-splay
receptacles or slots 128, indicated individually by references 128a and 128b.
The anti-splay pins 218 are attached or formed in the base frame 210 and
configured to engage the respective anti-splay slots or receptacles 128 in the
mother cart 100 as shown in Fig. 1A. The anti-splay pins 218 are configured to
engage the anti-splay slots 128 and provide a structural connection when the
daughter cart 200 is mounted in the mother cart 100, which functions to
prevent
the open end (i.e. C-Frame configuration) of the loading bay or slot 160 from
splaying or opening up and stressing the structure of the mother cart base
frame
110. As shown in Fig. 1A, the anti-splay slots 128a, 128b may include
respective
rollers 129a and 129b, which are configured to facilitate guiding and
engagement/disengagement of the anti-splay pins 218a, 218b, when the
daughter cart 200 is mounted/unmounted from the mother cart 100. According
to another embodiment, the base frame 110 of the mother cart 100 is configured
with anti-splay receiver holes 129, indicated individually by references 129a
and
129b, respectively, as shown in Fig. 8. The anti-splay receiver holes 129 are
configured to receive the anti-splay pins 218. According to an exemplary
implementation, the receiver holes 129 are chamfered or beveled as indicated
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by reference 131 to facilitate the guiding and insertion of the anti-splay
pins 128
as the daughter cart 200 is loaded on the mother cart 100.
[00047] As shown in Fig. 1A, the base frame 110 of the mother cart 100
includes slide or guides plates 122, indicated individually by references 122a
and 122b. The slide plates 122 help guide the daughter cart 200 into position
onto adjacent support surfaces or ledges 123a and 123b on the base frame 110
when the daughter cart 200 is loaded onto the mother cart 100. The base frame
110 may also include a front roller track comprising rollers 124, indicated
individually by references 124a, 124b, 124c in Fig. 1A, and a rear roller
track
comprising rollers 125, indicated individually by references 125a, 125b. The
rollers 124, 125 are configured to facilitate movement of the daughter cart
200
on and off the mother cart 100. According to another aspect, the rollers 124,
125 can be mounted higher (or lower) on the base frame 110 to increase (or
decrease) the ground clearance between of the daughter cart 200 when
mounted on the mother cart 100. According to another aspect, the base frame
110 on the mother cart 100 may also include one or more backstops 126,
indicated by references 126a and 126b in Fig. 1A. The base frame 210 of the
daughter cart 200 includes corresponding stops 227, indicated individually by
references 227a and 227b in Fig. 2A. The stops 227a and 227b on the base
frame 210 of the daughter cart 200 function as "hard stops" which abut against
the respective backstops 126a and 126b when the daughter cart 200 is
mounted or loaded into the loading slot 160 of the base frame 110 in the
mother
cart 100.
[00048] As described above, the base frame 110 of the mother cart 100 is
configured with the primary restraint mechanism 120 and also the secondary
restraint mechanism 130. The primary restraint mechanism 120 is configured to
secure the daughter cart 200 by engaging or locking the hoop or ring 216 (Fig.
2A) on the base frame 210. According to an embodiment, the primary restraint
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mechanism 120 comprises a latch or hook 170 which is configured to engage
the hoop 216 and an actuator 172 for releasing the hook 170. The latch 170 is
biased (e.g. utilizing a spring mechanism) in a closed or locking position so
that
hoop 216 is engaged when the daughter cart 200 is loaded or pushed into the
loading bay or slot 160. The actuator 172 comprises a foot pad or lever which
is
depressed or push downwards by an operator to unlatch or unlock the hook 170
from the locking hoop 216, thereby allowing the operator to disengage or slide
out the daughter cart 200 from the mother cart 100, for example, by pulling on
the pull handles 212a, 212b.
[00049] The secondary restraint mechanism 130 is provided as a redundant or
backup restraint mechanism to prevent unintentional release of the daughter
cart 200 from the mother cart 100 in the event that the primary restraint
mechanism 120 malfunctions, e.g. the hook 170 becomes disengaged from the
locking hoop 216 on the daughter cart 200. According to an embodiment, the
secondary restraint mechanism 130 comprises a locking bar 180 which is
coupled to the base frame 110 of the mother cart 100 with a pivotable
connector 182. The locking bar 180 is configured to swing or pivot between an
open or unlocked position, indicated by reference 131 in Fig. 6B, and a closed
or locked position, indicated by reference 133 in Fig. 6B. In the locked
position
133, as shown in Fig. 1B, the locking bar 180 abuts against the base frame 210
(and the pull handle 212b) of the daughter cart 200, thereby preventing the
daughter cart 200 from moving out of the loading bay or slot 160 and away from
the mother cart 100, for example, if the primary restraint mechanism 120 has
failed or become unlatched.
[00050] Reference is next made to Fig. 5A, which shows a dual-configuration
mother cart indicated generally by reference 500. The mother cart 500 is
configured to load/carry a full size daughter cart 200 (Fig. 2), or a
fractional, e.g.
a three-quarter, size daughter cart as shown in Figs. 9A to 9D and indicated
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generally by reference 900. The daughter cart 900 comprises a configuration
similar to the daughter cart 200 of Fig. 2, with a smaller or reduced overall
dimensions for the base frame 210 and the deck 220. For example, the deck
220 for the full-size daughter cart 200 is approximately 50" x 50", as shown
in
Fig. 2D, and as shown in Fig. 9C, the three-quarter size daughter cart 900 has
a
deck 920 which measures approximately 34" x 34".
[00051] As shown in Fig. 5A, the loading bay 160 for the dual-configuration
mother cart 500 comprises a full-size loading slot indicated by reference 560
and a fractional, i.e. three-quarter, size loading slot indicated by reference
562.
The three-quarter size slot 562 is configured with a structure similar to the
loading slot 160 (Fig. 1A) and as shown comprises an intermediate support
member 512 connected to the base frame 110, a primary restraint mechanism
520, the loading or guide plate 122b and the anti-splay slot 128b (and the
roller
configuration 129b as described above). The three-quarter loading slot 562 for
the three-quarter daughter cart 900 is defined by the intermediate support
member 512 at one end, and at the other end by the loading or guide plate 122b
on the base frame 110 of the mother cart 500. The intermediate support
member 512 is configured with a loading or guide plate 522, rollers 524
(indicated individually by references 524a, 524b, 524c and 524d as shown), and
an anti-splay slot 528. As also shown, the loading slot 562 includes the
primary
restraint mechanism 520, which is configured in the same manner as the
primary restraint mechanism 120, and comprises a latch or hook 570 and an
actuator 572. The primary restraint mechanism 520 is configured to engage or
secure a locking hoop 916 (Fig. 9A) on the base frame 210 of the three-quarter
daughter cart 900, when the daughter cart 900 is loaded on the mother cart 500
as depicted in Figs. 6A to 6C.
[00052] According to another embodiment, the anti-splay mechanism
comprises an anti-splay plate or flange 928 as shown in Figs. 9A and 9B. The
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anti-splay plates 928, indicated individually by references 928a and 928b, are
configured to engage the anti-splay slots 128a, 128b and anti-splay rollers
129a,
129b, for example, as depicted in Fig. 1A and described above. The anti-splay
plates 928 may comprise, for example, a formed member in the frame of the
daughter cart 900, or a plate that is attached, e.g. welded, to the frame of
the
daughter cart 900, and sized or configured for engaging the respective anti-
splay slots 128. The particular implementation details will be readily
apparent to
one skilled in the art.
[00053] Referring back to Fig. 5A, the base frame 110 for the dual-
configuration mother cart 500 comprises a "C-Frame" configuration and is
configured for left-hand or left-side loading/unloading of the full size
daughter
cart 200 or the three-quarter size daughter cart 900. Fig. 5B shows, on the
other
hand, a dual-configuration mother cart 501 having a base frame 111 configured
for right-hand or right-side loading/unloading of the full size daughter cart
200
as shown in Fig. 5B, or a three-quarter size daughter cart 900 as shown in
Figs.
6A to 6D. The dual-configuration mother cart 501 is also shown in Figs. 7A to
7D, with a full size daughter cart 200 loaded in the full width loading bay or
slot
560. As shown in Fig. 7D, the mother cart 501 is can be configured with a tilt
angle, ranging from approximately 1 to 3 . As shown in Fig. 7B, the full-size
daughter cart 200 is secured with the locking bar 130 in the closed or locking
position 133.
[00054] As shown in Figs. 6A to 6D, a three-quarter daughter cart 900 is
loaded onto the dual-configuration mother cart 501 in a similar manner. The
three-quarter daughter cart 900 is positioned in front of and pushed into the
three-quarter loading slot or bay 562 and abuts against backstops 526a and
526b, as depicted in Figs. 6A and 60. The three-quarter daughter cart 900 is
secured into the loading position with the latch 570 on the primary restraint
mechanism 520 engaging the locking hoop 916 on the base frame 910 of the
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daughter cart 900 as shown in Fig. 6B. The daughter cart 900 is also secured
by
the secondary restraint mechanism 130 with the locking bar 180 being moved
from the unlocked position 131 to the locking position 133, as also shown in
Fig.
6B. According to an embodiment, the three-quarter size daughter cart 900 is
configured with anti-splay pins 918a and 918b (Fig. 6B) which are configured
to
engage the anti-splay slot 528 in the intermediate support member 512 and the
anti-splay slot 128b in the base frame of the mother cart 501.
[00055] Referring again to Fig. 4, two or more mother carts 400 are coupled
together to form a train or parts delivery system which is moved through an
industrial plant or factory, e.g. an automotive assembly plant, by a tractor,
engine other drive or propulsion system (not shown). The mother carts
indicated
individually by references 400a and 400b may comprise the single configuration
mother cart 100 (Fig. 1) and daughter cart 200 (Fig. 2), and/or the dual-
configuration mother cart 500 (Fig. 5) and the full daughter cart 200 (Fig. 2)
or
the three-quarter daughter cart 900 (Figs. 9A to 9D), or a combination
thereof.
The mother carts 400 are coupled together through the tow-bar 112 and hitch
114 to form an industrial parts delivery system and train, for an assembly
plant
or other type of physical plant or factory application.
[00056] The present invention may be embodied in other specific forms
without departing from the spirit or essential characteristics thereof.
Certain
adaptations and modifications of the invention will be obvious to those
skilled in
the art. Therefore, the presently discussed embodiments are considered to be
illustrative and not restrictive, the scope of the invention being indicated
by the
appended claims rather than the foregoing description, and all changes which
come within the meaning and range of equivalency of the claims are therefore
intended to be embraced therein.
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