Note: Descriptions are shown in the official language in which they were submitted.
CA 022F79064 1999-02-01
DRAWER TOWER
This is a divisional application of application serial no.
2,157,706 filed on 7 September, 1995.
BACKGROUND OF THE INVENTION
Field Of The Invention
The present invention relates to a cart for transporting
and/or containing materials. In particular, the present
invention relates to a drawer tower for a cart particularly
useful for transporting medical supplies from an off-site
location or warehouse to a hospital and vice versa.
Discussion OfRelated A~
Healthcare organizations that currently engage in off-site warehousing of
supplies have used existing wire carts, enclosed bins and a myriad of other existing
transport vehicles that were not specifically designed for the task, demand
constant maintenance and frequently need to be replaced. Those org~ni7~tions
quite often use whatever carts or vehicles that are readily available, such as
dollies, lockers wheeled on lorries or carts, Milcare's Bulk Supply Carts, Wireform
carts, wire carts with cages around them, and enclosed bin variations of intrasite
vehicles. However, such vehicles may show signs of excessive wear and tear when
used for off-site warehousing. Furthermore, supplies may be lost or broken
during transit due to the vibrations of the truck and delivery onto.and off of the
van.
Another comrnon problem is that supplies that are transported from one
facility to another may be exposed to the environment. Off-site warehouse and
hospital receiving docks frequently do not enclose the open doors of the truck and
potentially expose the medical supplies to rain, snow, and dirt. Carts used today
-
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-- 2
frequently are not enclosed so the supplles are exposed to such
environmental factors as dirt and dust that can ruin the
supplies. Failure to protect supplies often results in damaged
supplies, which translates into increased costs and waste and,
more importantly, to the lack of supplies designated for the
patient.
Another disadvantage of present day transport vehicles is
that they are not specifically designed to maneuver about
common obstacles such as docks, ramps, thresholds, and
irregular surfaces including cracks and holes in the pavement.
These types of obstacles often force an individual to transport
the medical supplies in ways that are unstable and could result
in injury to the individual or damage to the transport vehicle
or contents therein.
SUMMARY OF THE INVENTION
The present invention relates to a cart for transporting
materials along a floor having a base positioned parallel to
the floor. Positioned above the base is a rectangular cover
having a first side edge, a second side edge and a back edge
defining three sides of a rectangle. A first side support, a
second side support and a back support each extend from the
base to the cover. Four vertical supports extend from the base
to contact the cover at four points substantially aligned with
a first diagonal of the rectangle.
The present invention provides a drawer tower for
containing one or more slidable drawers, the drawer tower
comprising: a first side paneli a first and a second connector
attached to the first side panel, each of the first and second
connectors having a first end and a second end that each extend
along a first direction; a second side panel parallel to and
spaced from the first side panel along the first direction; a
third and a fourth connector attached to the second side panel,
each of the third and fourth connectors having a first end and
a second end that are directly opposite and extend toward the
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first and second ends of the first and second connectors,
respectively; and a first adjustment piece that receives a
predetermined length of the first end of the first connector
and receives a predetermined length of the first end of the
third connector, wherein the first adjustment piece has an
attachment device to permanently engage both of the first ends
and fix the separation between the first and second side
panels.
The present invention provides a durable transport cart
that protects medical supplies from being damaged by the
environment of during transport.
The present invention also provides improved flexibility
in storing a wide variety of sizes and shapes of medical
supplies.
The present invention also provides improved
maneuverability around common obstacles encountered during off-
site warehouse transport.
The foregoing features and advantages of the present
invention will be further understood upon consideration of the
following detailed description of the invention taken in
conjunction wit~
.
CA 022~9064 1999-02-01
.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a perspective view of a cart according to the present
invention;
FIG. 2 shows a front view of the cart of FIG. 1;
FIG. 3 shows a rear view of the cart of FIG. 1;
FIG. 4 shows a right side view of the cart of FIG. 1;
FIG. 5 shows a left side view of the cart of FIG. 1;
FIG. 6 shows a top view of the cart of FIG. 1;
FIG. 7 shows a bottom view of the cart of FIG. 1;
FIG. 8 shows an exploded view of the cart of FIGS. 1-7;
FIG. 9 shows a top view of the base of the cart of FIG. 1;
FIG. 10 shows a base frame for the base of FIG. 9;
FIG. 11 shows a bottom view of the base of FIG. 9;
FIG. 12 shows a side view of a swivel lock used with the cart of FIG. 1;
FIG. 13 shows a top view of the swivel lock of FIG. 12;
FIG. 14 shows a cross-sectional view of the left and right inner doors of the
cart of FIG. 1;
FIG. 15A shows the interior view of the left door of the cart of FIG. 1;
FIG. 15B shows a side view of the left door of FIG. 15A;
FIG. 16 shows a cross-sectional top view of a bumper used in the cart of
FIG. 1;
FIG. 17 shows a cross-sectional side view of the bumper of FIG. 16;
FIG. 18 shows a cover frame of the cart of FIG. 1;
FIG. 19 shows a bottom view of a cover of the cart of FIG. 1;
FIG. 20 shows a partially broken away view of the left and right inner
doors of the cart of FIG. 1;
FIG. 21 shows an interior view of the left end panel of the cart of FIG. 1;
FIG. 22 shows a cross-sectional top view of the left end panel of FIG. 21;
FIG. 23 shows the interior view of the rear panel of the cart of FIG. 1;
FIG. 24 shows a cross-sectional view of an emergency brake located on the
right wall of the cart of FIG. 5;
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FIG. 25A shows a variety of drawers and shelving that can be installed
within the cart of FIG. l;
FIG. 25B shows a perspective view of a drawer tower that can be installed
within the cart of FIG. 1 and shown in FIG. 25A;
FIG. 26A shows a front view of the drawer tower of FIG. 25B;
FIG. 26B shows a side view of the exterior of one of the side panels of the
drawer tower of FIG. 25B;
FIG. 26C shows a bottom view of the side panel of FIG. 26B;
FIG. 27A shows a front view of an inventory list holder for use with the
cart of FIG. l; and
FIG. 27B shows a side view of the inventory list holder of FIG. 27A.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A portable cart 2 for tr~nsporting materials along a floor or surface
according to the present invention is substantially shown in FIGS. 1-7. As shownin the exploded view of FIG. 8, cart 2 has a generally horizontal base 4 positioned
parallel to the floor that includes a rectangular and metallic base frame 6 withcorner flanges 8. Corner flanges 8 have inner and outer openings 9 and 11,
respectively. The base 4 preferably is generally rectangular in shape having a pair
of side edges 18 that face opposite each other and are attached to edges 14, 16.It is understood that other shapes for base 4 are possible without departing from
the spirit of the invention.
Base frame 6 preferably comprises a tubular steel weldment as shown in
FIG. 10. Plastic deck 12 is then placed on top of frame 6 as shown in FIG. 11.
Four wheels, such as 8-inch diameter casters 10 are mounted to base frame 6 and
plastic deck 12 by well known ~tt~chment devices, such as welds or a carriage
bolt, washer and nut (not shown). Deck 12 preferably is rectangular in shape
having a front edge 14 and a back edge 16 facing opposite each other and is
raised in the center to prevent water and dirt from becoming trapped inside the
cart 2. Deck 12 preferably is made of polyethylene plastic and is made by the
process of double wall vacuum forming to resist torsion and bending.
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The double wall vacuum process used for forming deck 12 is preferably
used for forming other parts of cart 2 as well. The process is well known and
comprises having two plastic sheets suspended on a rotary turntable. While the
turntable rotates, the temperature of each pLastic sheet is raised by a heating
element until they soften. The softened plastic sheets are then placed over pre-heated upper and lower aluminum molds of the part to be formed, such as deck
12. A vacuum is applied to each mold resulting in a pre-heated sheet being
sucked into each mold so that the plastic takes on the shape of the mold. Both
molds are then clamped together under pressure. During the clamping process,
the plastic sheets are fused to each other at places known as pinch points
wherever the upper sheet and lower sheets contact each other when the mold
halves come together. The fused pinch points increase the module of rigidity andstrength of the part.
Attached to front and back edges 14, 16 of the plastic deck 12 are
mounting surfaces 22 having a sideways "1~' shape formed to capture two extrudedplastic bumper surfaces, preferably made of polyvinyl chloride (PVC) plastic. Asshown in FIG. 9, plastic deck 12 also has slots or grooves 24 located along the
sides 20 and back edges 16 to receive, support and position side and back
supports, such as side walls 26 and back wall 28, respectively, vertically with
respect to the base 4. Plastic deck 12 also has an outer opening 30 and inner
opening 32 at each corner. Thus, base 4 has a pair of openings at each corner
thereof wherein one or, preferably, both of the openings at each corner are
approximately aligned with one of the diagonals extending between opposite
corners of base 4.
Like deck 12, the side walls 26 and back wall 28 are double wall vacuum
formed components made of polyethylene plastic. Each of the side walls 26 has
the same shape and is preferably symmetrical about its horizontal center line. As
shown in FIGS. 8 and 21, side walls 26 are preferably rectangular in shape having
a height of approximately 61", width of approxim~tely 25", and thickness of
approxim~tely 1". Back wall 28, as shown in FIG. 23, also is preferably
rectangular in shape having a height of approximately 61", width of approximately
CA 022~9064 1999-02-01
61" and thickness of approxim~tely 1". Of course, other shapes and dimensions
for walls 26 and 28 are possible without departing from the spirit of the invention.
Side walls 26 and back wall 28 each have alternating cylindric~l hollow
forms 34 and 36, respectively. Hollow forms 34 and 36 are offset from one
another so that when side wall 26 and back wall 28 are brought together at theiredges the hollow forms 34 and 36 intermesh with one another to form hollow
cylindrical channels at each corner extending along the height of the walls. T_ewalls 26, 28 are attached to each other by inserting rods 38 into each of the
hollow channels. Once they are attached to each other, the side walls 26 and
back wall 28 provide structure to the cart 2 which prevents distortion in the cart
which could affect door alignment.
Four inner frame members or supports, such as four 1.25" diameter steel
inner corner rods or tubes 40 extend vertically upward from base 4 by snugly
inserting each of the tubes 40 into corresponding openings of base 4, such as
inner openings 32 of deck 12 and resting against corner flange 8. It is understood
that the inner frame members can have other shapes, such as being rectangular,
without departing from the spirit of the invention. Furthermore, tubes 40 can bemade of other durable materials such as epoxy powder coat painted steel, chrome
plated steel or stainless steel. As will be described below, tubes 40 are also used
to support the inner shelving of cart 2. As shown in FIGS. 8 and 22, the two
front inner corner tubes 40 are also snapped into the front corners 41 of side
walls 26 to provide further support thereof. Tubes 40 are attached to corner
flanges 8 by inserting bolts througll inner openings 9 of frame 8 from the bottom
side of base 4 and tightening into threaded inserts welded at the lower end of
each tube 40.
Outer frame members or supports, such as corner rods or tubes 42 also
extend vertically upward from base 4 as shown in FIG. 8. The tubes 42 are
inserted through openings in base 4, such as outer openings 30 of deck 12 and are
positioned over corner openings 11 of corner flange 8. Like tubes 40, each tube
42 is made of a durable material such as 1.25" diameter steel tubing which can be
epo~y powder coat painted, chrome plated, or stainless steel. In contrast to tubes
CA 022~9064 1999-02-01
40, each corner tube 42 has threaded inserts welded at both the upper and lower
ends. The corner tubes 42 are attached to the base frame 6 by inserting bolts
(not shown) through outer openings 11 and tightening into the threaded inserts.
Each of the outer corner tubes 42 then have corner bumpers 46 inserted over
them so as to cover a portion of tube 42. Preferably two corner bumpers 46 are
positioned at the top and bottom of each tube 42. The bumpers 46 have a cylin-
drical-like shape with notches 45 as shown in FIGS. 8 and 16 and preferably are
injection molded and made of an energy absorbent material such as PVC. As
seen in FIGS. 16-17, longitudinal notches 47 are formed in the interior of bumper
46 as well. Besides reducing the amount of material needed for each bumper 46,
the notches 45, 47 provide pockets to absorb impact energy in a manner similar
to a spring.
At each corner of cart 2, there is a bracket 48 which is attached to both
the outer tube 42 and inner tube 40. ~tt~chment is accomplished by welding the
bracket 48 to the center of the outer tube 42 and passing a bolt through the
bracket 48 and through a hole in the side wall 26 and threading the bolt into a
threaded insert located in the corresponding inner tube 40. The bracket 48
captures the side walls 26 at their center outer edges and provides support to
resist bending in the center of the outer tube 42 when pushing a loaded cart 2.
As shown in FIG. 8, each of the two inner tubes 40 located at the left side of the
cart 2 have a bracket 49 welded thereto. Each bracket 49 has an opening that
rotatably attaches an end of pull handle 50 so that the handle 50 pivots about the
brackets 49.
The two outer corner tubes 42 at the front of the cart are inserted through
alternating cylindrical forrns 52 located at the edges of double-paneled front doors
54. Preferably the top form 52 is closed while the lower forms have a half-
cylindrical shape. A steel collar 56 is locked in place around each of the frontrods 42 to establish the vertical location of each door 54. The two front outer
corner rods 42 act as a pivot axis for the front doors 54. Each door 54 preferably
is formed by the previously described double wall vacuum forrning process and
is composed of an inner and outer door 58 and 60, respectively. The inner and
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outer doors 58, 60 each are preferably syrnmetrical around their horizontal center
line. As shown in FIGS. 8 and 15A, the inner and outer doors 58, 60 are each
rectangular in shape. The inner door 58 preferably has a height, width and
thickness of approximately 59", 15", and 1 1/4", respectively, while outer door 60
preferably has a height of approxim~tely 59", width of approxim~tely 18", and
thickness of approxim~tely 1 1/4". It is understood that other shapes for door 54
are possible. For example, inner and outer doors 58, 60 could be replaced by a
single door or a tambour type door.
Like the side panels and back wall 26, 28, the inner and outer doors 58,
60 have intermeshing alternating cylindrical forms 62 that receive a 0.25" diameter
steel hinge rod 64 that form a piano hinge joint so as to attach the doors in a
pivoting marmer as seen in FIGS. 1, 2, and 14. To fully open the cart 2, each
inner door 58 opens and folds against the face of the corresponding outer door
60, then both doors 54 pivot around the outer tube 42 and nest against the cart
side walls 26. The steel rod 64 joining these inner and outer doors 58, 60
together extends past the top edge of the doors so that when the doors are closed
against the front of deck 12 and cover 92, rod 64 is captured in a spring loadedroller catch 63 mounted to the front of cover assembly 92 as seen in FIGS. 8 and19. The user opens the inner door 58 by rotating inner door 58 against the outerface of outer door 60 and then pulling on the edge of the nested doors to release
them from the catch. Of course, various other configurations are possible for the
inner and outer doors 58, 60 relative to the amount of pivoting about rods 64 and
tubes 42.
Doors 54 can also be latched into the closed position as shown in FIG. 1.
As shown in FIGS. 15A-B and 20, each inner door 58 has a full-height latching
mech~nism 66, which assembles from the back side of inner door 58. Latching
meçh~nicm 66 comprises a one-piece wire 65 with a loop 67 inserted through a
slot in inner door 58 and retained with backing plate 70 so that loop 67 acts asa handle on the front side of inner door 58. Backing plate 70 preferably is pop
riveted to the center of inner door 58. Top and bottom diecast cylindrical
receptors 68 are formed with mounting ears 72 that are slid over the wire 65 at
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the top and bottom. Each receptor 68 has a cylindrical cavity. Inserted into thebottom receptor 68 is a spring 74 and a steel collar 76 which positions the spring
74 within the cavity. The above-described latching mech~ni~m 66 is mounted to
the inner door 58 by snapping the one piece wire 65 into a groove in the back ofinner door 58. Receptors 68 have corresponding inserts formed in the inner door
58, which they nest into. Further attachment is accomplished by inserting a
threaded fastener or pop rivet through each opening 77 in the mounting ears 72
to engage with the inner doors 58.
When assembled, the formed wire loop 67 protrudes through a slot ~n the
center of the inner door 58 while the portion of wire 65 extending below irmer
door 58 is spring loaded in the downward direction. At the top of the inner door58, the wire 65 is below the top edge of the inner door 58, but still captured by
the top receptor 68. The wire loop 67 can easily be pivoted sideways against theface of the inner door 58 during transport.
Two spring loaded catches 78 are secured to the cover assembly 92 through
previously routed holes in the plastic skin. These catches 78 are composed of a
cylindrical diecast housing 80, diecast striker 82, spring 84, and nylon plug 86. As
shown in FIG. 20, the striker 82 is spring loaded in the downward position and
extends below the cover assembly 92.
As shown in FIGS. 9 and 20, a stainless steel striker plate 88 is pop riveted
to the plastic bottom deck 12. This plate 88 has two holes 90 which accept the
ends of the wire forms on both right and left hand inner doors 58. Matching
clearance holes are drilled in the deck 12.
As door 54 is closed, the bottom of wire 65 travels upward onto striker
plate 88 and then springs downward to be captured in the hole 90 in the striker
plate 88. In addition, the closing of door 54 causes a ramped surface 91 attached
to top receptor 68 to push the latch striker 82 attached to the cover assembly 92
upward as shown in FIG. 15B. Further closing of door 54 causes striker 82 to
spring back and secure the top edge of the inner door 58 by being captured in the
top receptor 68.
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To open the door 54, the user lifts up on the handle 67 protruding from
the door face c~ ing the bottom of wire 65 to disengage the stainless steel striker
plate 88 attached to the bottom deck 12. Continuing the upward motion of the
handle 67 causes the top of wire 65 to push up on the spring loaded striker 82 at
the top edge of the door. When this striker 82 is above the top edge of the door,
the user pulls out on the wire formed handle 67 opening the inner door 58.
For inventory control purposes, the latch mechanism 66 can be replaced
with a battery powered solenoid. The user will need an access code to trigger the
solenoid and open the door. An example of such a solenoid powered latch
meçh~ni~m is disclosed in U.S. Patent Application Serial No. 08/082,588 filed
June 23, 1993 and assigned to Herman Miller, Inc., whose contents are incorpo-
rated herein by reference.
Further security for the cart 2 may be provided by preventing the wire
formed handle 67 from moving upward by utilizing one of many known lock
mech~ni~m.~ with the door 54 in its closed position.
As shown in FIG. 18, the cover 92 has a three-sided steel frame 94 that is
insert molded therein. Steel frame 94 preferably has a pair of side frame
elements 96 attached to a front frame element 98 that are attached to each otherby welding or the like. The frame 94 preferably forms three sides of a rectanglehaving a length of approximately 62" and a height of approxim~tely 25". Flanges
100 are welded to the ends of the frame elements 96, 98 of frarne 94. Each
flange 100 has an inner opening 102 and outer opening 104. The steel frame 94
preferably is covered with polyethylene plastic to reduce the overall weight of the
cart and increase the manageable weight of supplies carried by the cart 2. The
rectangular cover 92 so formed has a pair of openings at each corner thereof
wherein one or, preferably, both of the openings at each corner are approximately
aligned with one of t~he diagonals extending between opposite corners of cover 92.
Furthermore, the cover 92 preferably is formed by a double wall vacuum forming
process.
The four outer openings 104 are aligned with the four outer corner tubes
42. Furthermore, the underside of the cover 92 has four hollow inner openings
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102 that are aligned with the four inner corner tubes 40. The cover 92 is attached
to the rest of the cart 2 by inserting the inner corner tubes 40 into openings in the
cover 92, such as the hollow inner openings 102, inserting outer corner tubes 42through a second set of openings of cover 92, such as hollow openings 104, and
passing bolts 108 through openings 104 from the opposite side and having them
engage the threaded inserts located at the top of each of outer corner tubes 42.The tubes 40, 42 act as vertical supports extending from the base 4 to the coverassembly 92 where four of the supports are aligned along one diagonal of the
rectangle defined by frame elements 96, 98 and two of the outer tube supports 42lie outside the rectangle. The other four supports are aligned with the other
diagonal of the rectangle with two of the outer tubes 42 lying outside the
rectangle. Furthermore, the inner tubes 40 are separated from outer tubes 42 by
side walls 26, back wall 28 and doors 54 so that inner tubes 40 are in the interior
of the cart 2 while outer tubes 42 are located at the exteriorly of the cart 2.
Similar to the plastic deck 12, the underside of the cover assembly 92 pro-
vides a channel 110 to nest the side walls 26 and back wall 28 therein. There isalso a door stop surface 112 molded into cover assembly 92 to prevent the doors
54 from pivoting into the interior of cart 2.
Once the cart frame has been assembled as described above, a variety of
large and bulky medical supplies can be placed in the interior of the cart 2 at the
warehouse and moved into a van or truck. The cart 2 is ideal for off-site
warehouse transport since it has a rigid enough structure to withstand push-
ing/pulling at all points. The doors 54 (in both the opened and closed position)are able to withstand push pressure from the user when moving the cart.
Furthermore, the cart 2 is configured so that a single person can move the cart
2 onto the van or truck by pushing on two of the outer tubes 42 located at one
end of the cart 2. Using tubes 42 like handles helps to protect the user's
knuckles. The cart 2 can also be pulled by use of handle 50 located at one end
of the cart 2. When not in use handle 50 sits in a formed perimeter of the side
wall 26.
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Once the person pushes or pulls the cart 2, the cart is easily maneuverable
due to the four casters 10. Two of the four casters 10 simply swivel while a third
caster 10 shown in FIGS. 12-13 will have a swivel lock that can engage with the
third caster. The swivel lock 114 has a cylindrical spring loaded plunger 116 that
is withdrawn so that plunger 116 does not engage caster 10 and allowing caster
10 to freely swivel. Caster 10 can be locked to roll along any direction such asparallel to back wall 28 shown in FIGS. 12-13 by inserting plunger 116 into a
notch 118 located in a rotating turret 120 of caster 10. Inserting plunger 116 into
notch 118 prevents turret 120 and caster 10 from swiveling. When locked, this
caster will cause the cart 2 to track straight m~king it easier for a single user to
maneuver the cart 2.
Insertion of plunger 116 into notch 118 is controlled by a pedal 122 that
is attached at the other end of the base frame 6 by mounting bracket 123 and is
in commllnication with insertion plunger 116 via wire 121. Pedal 122 is attachedto bracket 123 by a retaining pin 124 that passes through a slot in both ends ofmounting bracket 123 and which runs parallel to the floor and through holes in
both ends of foot pedal 122. Pedal 122 has an "L" shape with the longest leg
being parallel to the floor when the swivel lock 114 is in its engaged position with
caster 10. To release swivel lock 114, the user steps on the longest leg to pivot
the pedal downward. As the pedal pivots downward, its short leg bears against
the front surface of mounting bracket 123 moving it and retaining pin 124 forward
in the slot of mounting bracket 123 away from base frame 6. This movement
pulls on wire 121 which is also attached to retaining pin 124 and plunger 116,
resulting in plunger 116 being removed from notch 118 and releasing rotating
turret 120.
Besides a swivel lock 114, a hand-operated emergency brake may be
attached to two casters 10 at one end of cart 2 to quickly stop the cart. As shown
in FIG. 24, the brake is comprised of a pivoting brake handle 125 which is
attached to inner tubes 40 by brackets 127. A brackét 127 is fastened to each
inner tube 40 by passing a bolt through the hole in bracket 127, the hole in
brackets 48, the hole in side wall 26, and into threaded inserts located in the
CA 022~9064 1999-02-01
corresponding inner tube 40. A pair of casters 10 each have a hole through theirking pins 129. Through these holes the ends of wire cables 131 are passed.
Cables 131 communicate brake handle 125 with brake levers 133 through their
attachment at both ends. Brake levers 133 are mounted to casters 10 through
pivot pins 135 and support brackets 137. Brake shoes 139 are secured to brake
levers 133 and positioned adjacent to wheels of casters 10.
To activate the emergency brake, the user grabs onto brake handle 125
while cart 2 is in motion moving away from the user. The momentum of cart 2
causes the brake handle 125 to pivot downward. As the handle 125 moves
downward, the links 141 welded to it and attached to cables 131 pivot upward.
The upward motion of cables 131 lift up and pivot brake levers 133 c~using brakeshoes 139 to come into contact with wheels of casters 10. The friction from thiscontact slows the rotation of casters 10 until cart 2 comes to a stop.
Once the cart 2 is loaded onto the van or truck, the user secures the cart
in the truck or van using what is commonly called a load bar. The securing
mech~nism will decrease the tendency of items to shift during transport.
Besides providing maneuverability and durability, cart 2 allows for a
multitude of shelving schemes to accommodate diverse shapes and sizes of
medical supplies. For example, FIG. 8 shows a full width horizontal wire shelf
126 that can be attached to inner tubes 40. Each of the inner tubes 40 have
threaded inserts 128 as seen in FIG. 8 that are vertically spaced from each other
by approximately 6". Well known connectors are used to engage each corner of
the shelf and be threadedly inserted into the inserts 128.
A shorter shelf 130 may be used adjacent a drawer tower 132 in the
shelving scheme of FIG. 25A. The drawer tower 132 preferably consists of a pair
of symmetrical polyethylene plastic tower side panels 134 that are parallel to and
spaced from each other along a first direction as shown in FIGS. 25B and 26A-C.
Each side panel 134 is formed by a double wall vacuum process and preferably
is half the height of the cart opening. Up to four drawer towers 132 may be
inserted within cart 2. Drawer towers 132 may hold drawers and/or full depth
totes 136 specifically designed to fit in them. Each side panel 134 is reversible
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- 14-
to become right or left handed. Furthermore, the interior walls of each side
panel has one or more kacks that face each other and are directly opposite each
other, the tracks having a size to receive one or more slidable drawers.
As shown in the top cross-sectional view of FIG. 26C, each panel has two
connectors such as steel wire forrns 135 which snap in place to provide structure
for the plastic side panels 134. Each of the two wires 135 of the left side panel
134 has a pair of ends that protrude horizontally from the left side panel alongthe first direction. In addition, each of the two wires 135 of the right side panel
134 has a pair of ends that are directly opposite and extend toward corrcsponding
ends of the wires 135 of left side panel 134. As seen in FIGS. 26A-B, near the
bottom of the side panels 134 the wires 135 wind through a pair of notches in the
panel so that the bottom ends are located at in front of the front and back edges
of panels 134. Thus, the bottom ends are laterally offset with respect to the rest
of the wire 135 positioned vertically along side wall 134. Furthermore, portionsof the bottom of wire 135 rests on the floor so as to aid in supporting the tower
134 and lessening the load on side panels 134.
Four adjustment pieces such as steel tubes 137 with threaded inserts at-
tached perpendicular to its outer surface at both its hollow ends is used to join
right and left hand side panels. The tubes 137 slide over and receive a
predetermined length of each of the ends of wire forms 135 at all four corners.
,~tt~cllment devices such as bolts are then threaded into the inserts at each end
of tubes 137 c~nsing the end of the bolts to bear against and engage wires 135
clamping them into position. When tubes 137 and wires 135 are assembled and
clamped to each other they establish the side-to-side location of the panels 134.
By varying the amount of the predetermined length of wires 135 that are insertedinto each end of tube 137, one varies the distance between panels 134.
These adjustable cross-tubes 137, allow.the customer to use a variety of
drawers and/or full depth totes in the tower. Examples of drawers that may be
used are those lockable drawers m~nllf~ctured under thé trademark of Co/Struc~.
Labels may be placed on the drawers and/or shelves which not only list the item
but also may require bar codes or other nonhuman readable inventory control
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- 15-
data. Furthermore, the drawer tower 132 is positioned in the cart per customer
preference. If in the bottom half, grooves 138 are provided in the deck 12 to
position the towers 132. If in the top half, it nests on the cross wires of the wire
shelf 126.
An optional inventory list holder 140 can be attached with threaded
fasteners to either side wall 26. As shown in FIGS. 27A-B, holder 140 consists
of a sheet metal backing 142 with erasable marker board 144 laminated to it. A
flat, clear plexigl~s cover 146 is attached to the sheet metal backing through apiano hinge 148. Along the perimeter of the sheet metal backing 142, a closed
cell foam strip 150 is bonded to provide a barrier against water and dirt. The
plçxigl~s cover 146 closes by means of a quarter turn fastener 152. The user canwrite on the marker board 144 or insert charts or inventory lists which can be
passed over with a hand-held bar code scanner to track the cart contents.
The foregoing description is provided to illustrate the invention, and is not
to be construed as a limitation. Numerous additions, substitutions and other
changes can be made to the invention without departing *om its scope as set
forth in the appended claims.
