U.S. patent number 3,804,033 [Application Number 05/262,148] was granted by the patent office on 1974-04-16 for pallet with folding corner posts.
This patent grant is currently assigned to G. R. P. Company, Ltd.. Invention is credited to Michizo Izawa, Takeo Izawa.
United States Patent |
3,804,033 |
Izawa , et al. |
April 16, 1974 |
PALLET WITH FOLDING CORNER POSTS
Abstract
The four upright posts which project from the corners of a
pallet platform each have a tubular base portion fixed to the
platform and a top portion of the same tubular material. In the
operative position of the post, longitudinally tapering recesses
and projections of the two portions conformingly engage each other,
and the bore of the top portion is conformingly engaged by a core
fixed to the base portion and projecting from the bore of the same.
A transverse pin between two projections of the top portion is
received in a longitudinal guide slot of the core, thereby
permitting the top portion to be lifted longitudinally from its
operative position to an intermediate position in which the
projections and recesses are disengaged, and thereafter to be
folded toward the platform for compact storage of the pallet or
outward to facilitate loading and unloading.
Inventors: |
Izawa; Michizo (Tokyo,
JA), Izawa; Takeo (Kanagawa-ken, JA) |
Assignee: |
G. R. P. Company, Ltd. (Tokyo,
JA)
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Family
ID: |
12655713 |
Appl.
No.: |
05/262,148 |
Filed: |
June 12, 1972 |
Foreign Application Priority Data
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Jun 16, 1971 [JA] |
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46-43147 |
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Current U.S.
Class: |
108/53.5;
108/55.1 |
Current CPC
Class: |
B65D
19/385 (20130101) |
Current International
Class: |
B65D
19/38 (20060101); B65d 019/44 () |
Field of
Search: |
;108/55,56,129 ;297/357
;248/188.6 ;287/2,3,99 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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969,970 |
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Sep 1964 |
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GB |
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249,467 |
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1948 |
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IT |
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599,210 |
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Mar 1948 |
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GB |
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Primary Examiner: Gilliam; Paul R.
Attorney, Agent or Firm: Berman; Hans
Claims
What is claimed is:
1. A pallet comprising a platform defining a loading surface and a
plurality of posts distributed about the circumference of said
surface,
a. each post having an elongated base portion fixedly fastened to
said platform and an elongated top portion,
b. each portion having an outer skin,
c. said top portion being formed with an elongated bore extending
longitudinally within said skin of the top portion,
d. said base portion having an elongated core part attached
thereto, said core part longitudinally projecting from said skin of
said base portion and being received conformingly in said bore of
the top portion in an operative position in which said portions are
aligned longitudinally and substantially at right angles to said
surface,
1. said skins, said bore, and said core part each being of
substantially uniform angular cross section,
e. each of said skins being formed with two longitudinal
projections and recesses, each projection conformingly engaging a
recess on the other portion in said operative position,
1. in each of said portions, said two recesses being arranged
opposite each other, and said projections being arranged opposite
each other and angularly offset from said recesses,
2. each recess and elongation tapering in the direction of
elongation of the associated portion,
3. a portion of said core part projecting longitudinally from said
skin of said base portion beyond the projections of said base
portion,
4. said core part being formed with a longitudinal slot extending
into said projecting portion of said core part, and
f. a hinge pin connecting the two projections of said top portion,
said hinge pin being received in said slot and guiding longitudinal
movement of said top portion relative to said base portion toward
and away from said operative position while permitting angular
movement of the top portion relative to the base portion when said
projections and recesses are disengaged.
2. A pallet as set forth in claim 1, wherein said cross section is
rectangular.
3. A pallet as set forth in claim 1, wherein said platform is
rectangular, one of said base portions being fastened to each
corner of said platform, the length of each top portion being much
greater than the length of the associated base portion.
Description
This invention relates to pallets, and particularly to an improved
pallet of the type having posts distributed about the circumference
of the loading surface and capable of being folded down toward the
surface for compact storage.
The posts of many known pallets are rather shaky in the erected or
operative position, require relatively great effort for folding and
erection, and present projections in the erected condition which
may catch and damage packages loaded on the pallet.
The primary object of the invention is the provision of a pallet of
the type generally described above which is free of the
shortcomings of the known devices, more specifically the provision
of a pallet whose erected posts are rigid, and become more rigid
under an applied load, are easily erected and folded, and have a
smooth surface when erected.
With these and other objects in view, each post on the pallet of
the invention has an elongated base portion fixedly fastened to the
pallet platform and an elongated top portion, each portion having
an outer skin. One portion is formed with a bore extending
longitudinally within the skin thereof. The other portion has a
core part which longitudinally projects from the skin of the other
portion and is conformingly received in the afore-mentioned bore in
an operative position in which the two portions are aligned
longitudinally and substantially at right angles to the loading
surface of the pallet.
Longitudinal projections and recesses in the two skins conformingly
engage each other in the operative position. The two post portions
are longitudinally guided between the operative position and an
intermediate position by cooperating guide means on the one portion
and the core part of the second portion. The projections and
recesses of the two skins are disengaged in the intermediate
position, and the top portion may be moved angularly toward and
away from longitudinal alignment with the base portion in the
intermediate position on a hinge device connecting the core part
and the one post portion.
Other features, additional objects, and many of the attendant
advantages of this invention will readily be appreciated as the
same becomes better understood by the followong detailed
description of a preferred embodiment when considered in connection
with the appended drawing in which:
FIG. 1 shows a pallet of the invention with erected corner posts in
a perspective view;
FIG. 2 shows one corner post of the pallet of FIG. 1 and associated
elements in the folded condition of the post in a fragmentary view
on a larger scale; and
FIG. 3 shows the pallet of FIG. 1 in fragmentary section on the
line III--III on a scale intermediate those of FIGS. 1 and 2.
Referring now to the drawing in detail, and initially to FIG. 1,
the illustrated pallet is provided with four corner posts, each
having a base portion 1 and a longer top portion 2. The two
portions consist of steel tubes having the same square cross
section over practically their entire length. The base portions 1
are fixed to the four corners of the base frame 3 of the pallet
which partly consists of the same tubular material. Parallel,
transversely spaced, wooden slats 13 cover the frame 3 and form the
loading surface of the platform. The lower end of the base portion
1 of each post is supported on a footing 12 on the base frame 3,
and the upper end of each base portion 1, as far as is seen in FIG.
1, projects a very small distance beyond the loading platform.
A tubular core 4 of square cross section is conformingly received
in the bore of each base portion 1, as is best seen in FIG. 2. It
is fixedly fastened to the outer skin of the base portion 1 by a
bolt 11 passing through aligned openings in the skin of the base
portion 1 and the core 4, and secured by a nut. It projects upward
beyond the outer tubular skin of the base portion 1 which alone is
seen in FIG. 1, the projecting part of the core 4 being received in
the bore of the top portion 2 in the erected or operative position
of the posts seen in FIG. 1. Upright, longitudinal guide slots 5 in
opposite walls of the core 4 extend well above the topmost part of
the outer skin of the base portion 1 and slidably and rotatably
receive a cylindrical hinge pin 6.
Two longitudinal projections 7 on the outer skin of the base
portion 1 taper in an upward direction, and two similar projections
8 on the top portion 2 also taper longitudinally, the hinge pin 6
being fastened to the projections 8 near their narrow free ends. In
the erected condition of the post shown in FIG. 1, the projections
7, 8 are conformingly received in recesses 9, 10 in those sides of
the other post portion which do not carry projections.
In the operative position illustrated in FIGS. 1 and 3, the two
portions of each post are firmly interlocked by the core part 4 of
the base portion 1 which is conformingly received in the bores of
both portions, and by the projections 7, 8 wedged in the conforming
recesses 9, 10. If several loaded pallets are stacked, as is
customary, the weight of the superposed pallets rests on the top
portions 2 and more rigidly wedges the two post portions to each
other.
When it is desired to fold a post, its top portion 2 is readily
lifted to an intermediate position, similar to that shown in FIG.
2, in which the two portions 1, 2 are still aligned longitudinally,
but the projections 7, 8 are fully disengaged from the associated
recesses 9, 10, thereby permitting the top portion 2 to be tilted
toward the loading surface, as is shown in FIG. 2, and thereafter
lowered until it rests on the slats 13 for compact storage of the
pallets. A cap 14 protects the exposed longitudinal end of the core
part 4. During loading and unloading, it may be more convenient to
tilt the upper post portions 2 from the intermediate position
outward and away from the loading platform.
While the illustrated arrangement, in which the core 4 is a fixed
part of the base portion 1 and releasably engages the top portion
2, is usually preferred, this relationship of the several elements
may be subjected to permutations and variations without losing all
the advantages inherent in the illustrated embodiment. When the
core 4 is a fixed part of the base portion 1, as specifically
illustrated and described above, the top portion 2 may be provided
with the guide slots 5, and the hinge pin 6 may be mounted on the
core part 4.
Other variations will readily suggest themselves to those skilled
in the art, and it should be understood, therefore, that this
invention may be practiced otherwise than as specifically
illustrated, and is to be limited solely by the scope and spirit of
the appended claims.
* * * * *