U.S. patent number 3,812,995 [Application Number 05/229,793] was granted by the patent office on 1974-05-28 for combination container and skid support.
This patent grant is currently assigned to McDonnell Douglas Corporation. Invention is credited to Paul E. Lewis.
United States Patent |
3,812,995 |
Lewis |
May 28, 1974 |
COMBINATION CONTAINER AND SKID SUPPORT
Abstract
A vacuum-formed polyethylene container and skid support for
forklift handling wherein the skid support has a four-way forklift
entry for expeditious handling and has a self-reinforcing
configuration which makes it light but rugged.
Inventors: |
Lewis; Paul E. (Anaheim,
CA) |
Assignee: |
McDonnell Douglas Corporation
(Santa Monica, CA)
|
Family
ID: |
22862684 |
Appl.
No.: |
05/229,793 |
Filed: |
February 28, 1972 |
Current U.S.
Class: |
220/1.5; 220/605;
108/55.1; 220/636 |
Current CPC
Class: |
B65D
19/18 (20130101); B65D 2519/00268 (20130101); B65D
2519/00129 (20130101); B65D 2519/00348 (20130101); B65D
2519/00273 (20130101); B65D 2519/00208 (20130101); B65D
2519/00557 (20130101); B65D 2519/00288 (20130101); B65D
2519/00497 (20130101); B65D 2519/00069 (20130101); B65D
2519/00318 (20130101); B65D 2519/0086 (20130101); B65D
2519/00796 (20130101); B65D 2519/00174 (20130101); B65D
2519/00059 (20130101); B65D 2519/00034 (20130101); B65D
2519/00661 (20130101); B65D 2519/00711 (20130101) |
Current International
Class: |
B65D
19/02 (20060101); B65D 19/18 (20060101); B65d
019/04 (); B65d 019/18 () |
Field of
Search: |
;108/51,52,56,58
;220/1.5,69 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lowrance; George E.
Attorney, Agent or Firm: Richardson; Robert O. Royer; Donald
L. Jason; Walter J.
Claims
What is claimed is:
1. An integral one-piece skid support comprising:
a central portion of rectangular shape adapted to contact the
bottom of a container to be supported thereby,
intersecting channels bounding said central portion,
said channels having floor contacting skid portions,
said channels being open at the ends thereof to receive forks of a
forklift truck from any of four directions, said channels having
inner vertical walls terminating at their upper edges with the
edges of said central portion
said channels having vertical outer walls terminating in fastening
flanges for attachment to a container to be supported thereby,
said fastening flanges having downturned reinforcement edges
connecting with said floor contacting skid portions and with said
channel outer vertical walls
said channels inner vertical walls forming horizontal corners at
their tops with said central portion,
said channel inner vertical walls intersecting to form vertical
corners,
said inner vertical walls terminating at their lower edges in said
floor contacting skid portions and forming horizontal corners
therewith.
2. A skid support as in claim 1 wherein said reinforcement edges
are in alignment with said inner vertical walls and extend
outwardly from intersecting channels.
3. A skid support as in claim 1 in combination with a container
positioned thereon,
means connecting said fastening flanges to the bottom of said
container,
said channels being open at the top thereof to permit contact of
the forks of a forklift with the bottom of said container between
said flanges and said central portion.
Description
BACKGROUND OF THE PRESENT INVENTION
In industrial areas, trash, scrap, manufactured parts and other
items are placed in containers for storage, utilization or
transportation to other areas. Steel tubs have been used for many
years. Even though they are protected by corrosion-resistant paint,
the corrosion problem still exists requiring refurbishing
periodically. Those having hinged lids still do not afford
environmental protection since moisture can and does seep in to
damage the material or add to the corrosion problem. For comparison
purposes, their initial cost of approximately 500.00 dollars is
distributed over a 15-year life expectancy. A wood box with pallet
is one of the most inexpensive containers in use, costing about
14.00 dollars. However, a complete replacement must be made every
45 days when subjected to the same environment as the steel tub
previously mentioned. The wooden sides of the box are abrasive to
the material contents being transported and the absence of a lid
subjects the material contents to pilferage and weather damage.
Both the steel tubs and the wood boxes are raised from the floor
and set on skid bases which permit them to be moved around and
lifted by a conventional forklift for loading, emptying or movement
to other areas.
SUMMARY OF THE PRESENT INVENTION
A plastic transport tub of a high-density polyethylene made by a
vacuum-forming process has been developed to provide the maximum in
environmental protection for shop supplies and perishable tools.
Its cost, as compared with the others, is about 73.00 dollars each.
A typical tub is 48 inches in length, 42 inches in width, and 33
inches high, and weighs 60 pounds. The inner volume of 38.5 cubic
feet has a support capacity of 1,500 pounds and a life expectancy
of 15 years. In a 2-hour period, a 2,500 pound load caused a
deformation but when pressure was released, the container
immediately returned to its normal configuration. The thickness of
the material preferably was 0.350 inch although appropriate ribs,
flanges, or rims would be of a greater thickness. Generally, the
configuration of the skid support is a central portion of
rectangular shape, positioned against the base of the container.
This central portion is bounded by four intersecting open channels
to receive forks of a forklift truck from any direction. The outer
walls of these channels terminate in fastening flanges for
attachment to the containers and reinforcement edges provide
additional rigidity and strength.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view looking upwardly from underneath to
show the container skid as it is attached to the container; and
FIG. 2 is a perspective view of the top of the skid with the
container removed.
Referring now to FIG. 1 there is shown a container 10 having a skid
support 12 fastened to the base thereof to function as an integral
unit. The container preferably is of a high-density polyethylene on
the order of 0.350 inch thick. The longitudinal or side walls 14
are 48 inches long and the transverse or end walls 16 are 42 inches
wide. The height is 33 inches, with the walls terminating in a
reinforcing lip or flange 18. The end and side walls 14 and 16 at
the bottom curve into a base 20 to form a single integral unit
without sharp corners to facilitate easy cleaning. This container
has a volume of 38.5 cubic feet and a load capacity of 1,500
pounds. The skid support 12 has a central portion 22 of generally
rectangular shape, having downturned walls 24 and 26 along its
sides which are load bearing. The transverse walls 26 intersect and
join the longitudinal walls 24 to form vertical corners for
additional rigidity and strength. These walls also serve as inner
guide walls which are part of the channels through which the forks
of a forklift pass when so positioned.
Extending horizontally and outwardly from the vertical walls 24 and
26 are intersecting longitudinal and lateral floor contacting skid
portions 28, 30. The outer edges of the longitudinal and lateral
skids, 28, 30, have upstanding walls 32 and 34 respectively of the
same height as the inner walls 24 and 26. They also serve as outer
guide walls and load bearing members to support the container 10 as
it rests on the skid support 12 on the ground or floor. The tops of
these upstanding walls 32 and 34 flare outwardly to form fastening
flanges 36 and 38 respectively for attachment to the base 20 of the
container 10 such as by means of bolts 40. The ends of fastening
flange 36 entend downwardly to form reinforcement edge walls 42
which also connect at their lower edge with the edge of skid
portion 30 at points extending outwardly from skid 28. They also
are connected with the end of the outer guide wall 32 to form
vertical corner supports. These end members are in alignment with,
and appear to be an extension of, the inner walls 26. It is noted
that flange 36 is equal in length to inner wall 24. Similarly,
fastening flange 38 also terminates at its ends in reinforcement
edge walls 44. These edge walls 44 unite with the outer upstanding
wall 34 and appear to be an outer extension of skid portion 28. The
intersecting walls 34 and 44 form a vertical corner which serve as
a reinforcement.
Longitudinal and transverse skid portions 28, 30 intersect and then
terminate along diagonal edges 46 which entend between edge walls
42 and 44 at each of the corners. This provides openings for the
placement of lift forks between the base 20 and skid portions 28 or
30. Entrance may be made from any of four directions. The inner and
outer walls 24, 32 and 26, 34, together with skid portions 28, 30,
form open channels for the lift forks which then bear against the
base 20 of the container 10 when lifting it for movement.
The intersection of horizontal and vertical walls form horizontal
corners, i.e., the line of intersection is horizontal. Similarly,
the intersection of vertical walls form vertical corners, i.e., the
line of intersection is vertical. In the embodiment shown there are
thirty-two horizontal corners to resist sag and twelve vertical
corners for strength and rigidity. Moreover, as horizontal and
vertical corners intersect they each reinforce the other, resulting
in an extremely rugged lightweight skid support.
It may be observed, particularly in FIG. 2, that the reinforcement
edge walls 42 and inner edges of fastening flanges 26 connect with
the outer guide walls 32 to form two horizontal corners 48, 50 and
one vertical corner 52 which intersect at a point 54. Similarly,
reinforcement edge walls 44 and inner edges of fastening flanges 38
connect with inner guide walls 34 to form two horizontal corners
56, 58 and one vertical corner 60 which intersect at a point 62.
There are eight such points, one at each end of the fastening
flanges 36, 38, which reinforce and protect the outer guide walls
32 and 34 of skid portions 28, 30.
The inner guide walls 24 and 26 form vertical corners 56 at their
planes of intersection. They also form horizontal corners 64 and 68
where they intersect central portion 22. These corners form points
70 at each corner of the central portion. These four points
reinforce and protect the inner guide walls 24, 26 of skid portions
28, 30.
Obviously, the points and corners need not be sharp nor the corners
squared but should approach these within the limits of practical
manufacturing. The intersection of the three planes provide
reinforcement and rigidity for the skid support 12 in supporting
the container 10 and in moving it with a forklift. The forks 72 may
be inserted above the skid portions 28 in the direction of arrows
74 or 76 and above skid portions 30 in the direction of arrows 78
or 80 as desired.
Having thus described an illustrative embodiment of the present
invention, it is to be understood that modifications thereof will
become apparent to those skilled in the art and it is to be
understood that these deviations are to be construed as part of the
present invention.
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