Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3824933 A
Publication typeGrant
Publication dateJul 23, 1974
Filing dateSep 14, 1972
Priority dateSep 14, 1972
Publication numberUS 3824933 A, US 3824933A, US-A-3824933, US3824933 A, US3824933A
InventorsW Lind
Original AssigneeJaw Bar Plastics Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Load bearing pallet and interlock
US 3824933 A
Abstract
A load bearing pallet including two identical mold formed halves each having a load bearing surface and a plurality of relatively spaced supporting pads with an interlocking feature provided thereon and comprising a projection on the supporting pad extending thereacross and with an overhanging lip formed on one side thereof immediately over a draft opening, and with an opening immediately behind the projection formed for interference snap-lock and press fitted engagement therethrough of a like projection on a pallet half disposed in complimentary relation thereover.
Images(2)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent [.191

Lind 1451 Jul 23, 1974 [54] LOAD BEARING PALLET AND INTERLOCK 3,592,145 7/1971 Petry 108/57 Inventor: Willard E. Lind c es Mich. 3,664,27l 5/1972 Wolder 108/58 [73] Assignee: Jaw-Bar Plastics Corporation, Primary Examiner-Paul R. Gilliam Birmingham, Mich. Attorney, Agent, or FirmDale Austin Winnie [22] Filed: Sept. 14, 1972 [57] ABSTRACT PP A load bearing pallet including two identical mold formed halves each having a load bearing surface and [52] US. 01. 108/51, 108/58 ,a plurality of relatively Spaced Supporting P with 51 1m. 01 B65d 19/18 imerlmking feature Provided thereon and Comprising 58 Field of Search 108/51-58 a P i the Supporting Pald emnding there" 1 across and with an overhanging lip formed on one side [56] References Cited thereof immediately over a draft opening, and with an UNITED STATES PATENTS opening immediately behind the projection formed for interference snap-lock and press fitted engagement g therethrough of a like projection on a pallet half dis- 3:307:504 3/1967 :532: n 108/58 posed in complimentary relation thereover. 3,404,642 10/1968 Belcher et al 108/58 X 4 Claims, 10 Drawing Figures I LOAD BEARING PALLET AND INTERLOCK BACKGROUND OF THE INVENTION Most load bearing pallets, which are used with fork lift trucks, are made of wood slats nailed to cross members, on each side, and are usually of unfinished lumber so roughly and crudely made that they are generally expendable after a relatively short period of time. Normally they are made so that fork lift entry is possible from only two opposite sides and since they are seldom painted or treated in any way they are prone to collect and retain moisture which results in mildew, rot and their ultimate deterioration.

Although efforts have been made to make pallets out of other more durable and longer lasting materials, the expense and/or added weight of the pallets have proven impractical on any large scale basis.

Aluminum and plastic materials have been tried, be cause of their relative light weight, but with these materials another problem has been that only single faced pallets can be made, due to the mold forming process from which they are derived. This, in turn means even further expense in fastening and retaining two complementary pallet halves together, if a two faced pallet is desirable.

SUMMARY OF THE PRESENT INVENTION The present invention is directed to a two faced pallet' having four way entry, which is made of a light weight high impact resistant plastic material, and which is mold formed to include a particularly new and model means of interlocking'opposite and relatively identical pallet halves together without the use of separate and distinct fastener means.

The basic pallet form is of an open honey cone structure with supporting pads formed at and between its corners which include the pallet interlock feature. The interlock on each pad includes a projection extending across the pad which has an overhanging lip provided on the outermost end of one side, immediately over a relatively narrow draft opening beside the projection which enables the overhanging lip to be mold formed right on the cross projection.

There is, in turn, an opening provided immediately beside and behind the pad projection which is formed to receive in an interference and snap-lock fitted engagement therethrough a like pad projection of an identical pallet half complementarily disposed thereover for press fitted interlocking engagement therewith.

As a consequence, identical pallet halves, with like supporting pads, including complementarily disposed interlocking features are received one over the other, in back-to-back relation, and may be force fitted into a secure and positive engagement to provide a two faced light weight pallet which allows four way entry and one which will not warp or rot and is capable of steam cleaning as and when desired.

DESCRIPTION OF THE DRAWING FIGURES FIG. 1 is a side edge view of one end of a pallet made in accord with the teachings of the present invention.

FIG. 2 is a top plan view of one corner of the pallet.

FIG. 3 is a perspective view of a whole pallet includ-' ing the interlock feature of the present, invention.

FIG. 4 is an enlarged cross-sectional view taken through one of the interlocking lugs or pads of the pallet shown in the previous drawing figures.

FIG. 5 is a bottom plan view of one of the interlocking parts, in and of itself.

FIG. 6 is a top plan view of the same interlocking part.

FIG. 7 is a side elevational view of the interlocking part with certain features shown in dotted outline as they are therewith.

FIG. 8 is a front face elevational view of the interlocking part, again with certain features shown in dotted outline as they are therewithin.

FIG. 9 is a side elevational view of two of the interlocking parts, as provided on like pallet halves and disposed relative to each other immediately prior to being press fitted into locking relationship with each other.

FIG. 10 is a side elevational view of the same two parts as shown in the immediately preceeding drawing DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT The first three drawing figures show a load bearing pallet 10 made up of two identical halves l2 and 14 which are joined and locked together by means of special locking lugs 16.

Each pallet half is made of a polyprope'n plastic such as polypropolene, polyethelene or polystyrene material in an open waffle pattern which includes transversely crossed ribs 18 and 20 that are about A of an inch deep and with a wall thickness of about A of an inch in the ribs and the locking lubs 16.

The pallet halves are formed with a narrowing taper or draft downwardly from their face sides, to facilitate their mold form release, as is shown princiapply in FIG. 4, and to include three locking lugs 16 along each side edge, and one centrally, for a total of nine locking lugs in all.

As joined and locked together the pallet halves provide a two face pallet having four way entry, that is from any accessible side, by a fork lift truck or like pallet lifting and moving means. And, they are impact tested and approved, will not warp or rot, can be steam cleaned, are light weight (about 35 pounds) and have a static load bearing capacity of 14,000 pounds which enables their use in at least four high stacks.

Of particular note are the locking lugs 16 which will hereafter be described in further detail. Since each pallet half 12 and 14 is identical, the locking lugs are identical and identically located so that they are relatively aligned when one pallet half is turned over and placed on another pallet half.

The locking lugs include a generally square box sectioned form, about 3 inches deep, with opposite side walls 22, 24 and 26, 28 including about a 5 draft. They also include a bottom wall 30 within which is provided two openings 32 and 34, one on each side of a projection 36 that extends between the relatively opposite side walls 26 and 28.

The larger of the two openings, which is identified as 32, is relatively behind the projection 36 and is formed on its outer side to include a chamfer of about 30 around three of its side edges and to have a straight, no draft, edge inclusive of the back wall 38 of the projection 36. It also includes on its inner side edge, opposite v the projection 36, a rib 40 which stands about .one-

fourth of an inch high and extends in parallel spaced relation to the projection on the inner side of the bot tom wall 30;

For reasons later more fully appreciated, the rib 40 has about a 15 camfer on each edge of its extreme end ity of relatively spaced members formed therewith inerand about a 2 draft along its side edge bordering the opening 32.

The projection 36, that is formed from the bottom wall 30, is not solid but inclusive of an opening 42 within its underside and admin hole 44 centrally of an inch apart from the bottom wall 30 and is formed to include a lip 46 near its outermost end which extends relative over the smaller bottom wall opening 34 on its other side. r

The back corners of the projection 36 and the front corners of the lip 46 each include about a 45 chamfer and the top or end wall of the projection includes about is of substantially the samewidth as the opening 32 relatively behind it, except for the lip 46. Accordingly when two locking lugs,-or pallet halves with locking r lugs, are disposed as shown in FIG. 9, their back walls 38 are relatively aligned against each other and the chamfered edge of their lips 46 lie on the chamfered edge of the opening 32.

thereof through its top wall. It extends a little under."/s

locking said halves together and relatively spacing said load bearing surfaces apart, said interlocking members comprising; a depending form under said load bearing surface and including a bottom wall providing a supporting pad, a projection on said supporting pad extending relatively thereacross near one side thereof and having an overhanging lipprovided on the outermost end of the outermost side thereof, an opening provided in said supporting pad next adjacent and relatively behind said projection near the other side thereof, and of a relatively like breadth and width thereto exclusive of said overhanging lip, and a rib rail formed on said bottom wall on the side edge of said opening opposite and in parallel spaced relation to said projection extending within said depending form, said lip and rib rail being formed for a yielding interference fit with a corresponding rib rail and lip, respectively, on a like depend- Since the shorter ends of both the projections 36 and the openings 32 are also chamfered there is a natural centering of the projections within the openings for rel-- ative alignment of the two pallet halves being joined together, andv since the side edge corners'of the projections are chamfered and the corners of the opening 32 are radiused, as shown, it follows that with a sufficient impact force, properly applied, the locking lug projections 36 may be forced through the openings 32, for the interlock shown in FIGS. 4 and 10, with the projection member lips 46 engaged over the ends of the ribs 40.

As previously mentioned, both the underside of the ing form received in complimentary relation and into pressed engagement therewith, said pallet halves being of molded plastic material and said supporting pads having a second opening formed therein immediately under said over hanging lip for mold form manufacturing ease and providing added elasticity in the interlocking use thereof, said first mentioned opening having the side edges therearound chamfered on the outer disposed side thereof and said projection being chamfered on the end thereof for complimentary alignment therebetween preceeding the pressed engagement of said projection therethrough, said lip and rib rail having a complimentary chamfer provided on the underside of said lip and on the extreme end wall of said rib rail for closer fitting interengagement therebetween.

2. The load bearing pallet of claim 1, said plastic material of said pallet halves and inclusive of said overhanging lip and rib rail being retained at a temperature of 80 to 1 10 for added pliability and lubricity condusive to the press fitted interengagement required there amount as the thickness, or standing height of the ribs 40, together with the thickness of the bottom wall 30,

so that there is a secure and tight interfit between the, lips 46 and ribs 40 and the assurance of a positive and r relatively fixed engagement between each pair of interengaged locking lugs.

In actual assembly the pallet material, and more parlips to provide for any necessarydrainageat each end,

in the final assembly, and, as mentioned, the locking projections 36 themselves are provided with drain holes 44 so that no accumulation of water will catch and stagnate aroundthe pallet interlocks.

In conclusion, although the interlocking system shown has been designed for use with load bearing palj between. v 3. A snap lock interference fitted connection for interlocking different plastic molded parts together, and comprising: two identical halves each having a load bearing surface and a plurality of relatively spaced members formed therewith interlocking said halves together and relatively spacing said load bearing surfaces apart, said interlocking members comprising a depending form under each of said plastic molded parts and I including a bottom wall providing a supporting pad, a

ticularly the locking lugs 16, are maintained at between a projection on said supporting pad extending relatively thereacross near one side thereof and having an overhanging lip provided on the outermost end of the outermost side thereof, an opening provided in said supporting pad next adjacent and relatively behind said projection near the other side thereof, and of a relatively like breadth and width thereto exclusive of said overhanging lip, and a rib rail formed on said bottom wall on the side edge of said opening opposite and in parallel spaced relation to said projection extending within said depending form, said lip and rib rail being formed for a yielding interference fit with a corresponding rib rail and lip, respectively on a like depending form received incomplimen'tary relation and into pressed engagetary chamfer provided on the underside of said lip and on the extreme end wall of said rib rail for closer fitting interengagement therebetween.

4. The snap lock interference fitted connection of claim 3, said plastic material of said molded parts and inclusive of said overhanging lip and rib rail being retained at a temperature of to 1 10 for added pliability and lubricity condusive to the press fitted interengagement required therebetween.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2699912 *Oct 6, 1953Jan 18, 1955Walton W CushmanKnockdown pallet
US3294040 *Mar 15, 1965Dec 27, 1966Gregoire Engineering And Dev CLoad carrying pallet
US3307504 *Dec 1, 1965Mar 7, 1967Nosco PlasticsPallet
US3404642 *Jul 27, 1967Oct 8, 1968Owens Illinois IncPallet
US3592145 *Aug 15, 1969Jul 13, 1971Us Air ForceForce-carrying interlock for aluminum extruded platform
US3664271 *Dec 15, 1969May 23, 1972Ernest Harold WolderPlastic molded pallet
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3916803 *Jan 16, 1974Nov 4, 1975Emilia Miguel GarciaLoading platform
US3964400 *Aug 28, 1974Jun 22, 1976B.V. Houtindustrie"De Phoenix"Pallet of synthetic material
US4189125 *Dec 8, 1978Feb 19, 1980Little Jim EGround support pads for mobile structures
US4316419 *Dec 20, 1978Feb 23, 1982Wavin, B.V.Plastics pallet
US4319370 *Oct 11, 1979Mar 16, 1982Imperial Chemical Industries LimitedBase for a bed
US4365803 *Dec 31, 1980Dec 28, 1982Victory Games, Inc.Game table
US4597338 *Nov 14, 1984Jul 1, 1986Pinckney Molded Plastics, Inc.Pallet
US4604014 *Jul 12, 1984Aug 5, 1986Illinois Tool Works Inc.Pallet fastener
US4635562 *Oct 29, 1984Jan 13, 1987Pinckney Molded Plastics, Inc.Sidewall assembly for tote box
US4799433 *Feb 6, 1987Jan 24, 1989Menasha CorporationLarge capacity shipping pallet assembly
US4824129 *Oct 13, 1987Apr 25, 1989Rehrig International, Inc.Plastic dolly with protective caps
US5007352 *Jun 22, 1988Apr 16, 1991Design Count Pty. Ltd.Pallet construction
US5197396 *Aug 5, 1991Mar 30, 1993Penda CorporationDouble deck plastic pallet
US5320048 *Mar 25, 1991Jun 14, 1994Gideon FeinerPanel structures formed by extrusion
US5351629 *Mar 16, 1993Oct 4, 1994Teienda CorporationDouble deck plastic pallet
US5413052 *Mar 29, 1993May 9, 1995Trienda CorporationPlastic pallet with two decks
US5497709 *Oct 28, 1994Mar 12, 1996Larry WingetPlastic pallet assembly
US5555820 *Apr 24, 1995Sep 17, 1996Shuert; Lyle H.Pallet with plastic legs
US5582113 *Oct 13, 1994Dec 10, 1996Langenbeck; Keith A.Modular pallet
US5799378 *Jan 24, 1997Sep 1, 1998Gershenson; BruceFastening system
US6006677 *Jan 8, 1998Dec 28, 1999Rehrig Pacific Company, Inc.Plastic pallet
US6029583 *Jul 2, 1996Feb 29, 2000Allibert-Contico, L.L.C.Pallet with attachable upper and lower members
US6112672 *May 28, 1999Sep 5, 2000Burnham Service Company, Inc.Selectively arrangeable pallet
US6209175Sep 11, 1997Apr 3, 2001Bruce GershensonFastening system
US6250234Jul 1, 1998Jun 26, 2001Rehrig Pacific CompanyMethod of reinforcing a plastic pallet
US6263807 *Dec 6, 1999Jul 24, 2001Ir Operating CorporationReinforced plastic pallet
US6283044Jun 11, 1999Sep 4, 2001Rehrig Pacific CompanyPallet assembly
US6389990Jun 25, 2001May 21, 2002Rehrig Pacific CompanyMethod of reinforcing a plastic pallet
US6418862Jun 23, 2000Jul 16, 2002Burnham Service Company, Inc.Shock absorbing pallet
US6622641Oct 3, 2001Sep 23, 2003Rehrig Pacific CompanyPallet
US6644219Sep 1, 2001Nov 11, 2003Rehrig Pacific CompanyPallet assembly
US6705237Aug 24, 2001Mar 16, 2004Infiltrator Systems, Inc.Plastic pallet design
US6784234Oct 7, 1998Aug 31, 2004General Electric CompanyHigh performance plastic pallets
US6805061Jan 22, 2002Oct 19, 2004Rehrig Pacific CompanyTwo-piece pallet
US6840181Sep 3, 2003Jan 11, 2005Rehrig Pacific CompanyPallet
US6886475Jan 19, 2003May 3, 2005Rehrig Pacific CompanyPlastic pallet
US6935249Dec 8, 2003Aug 30, 2005Infiltrator Systems, Inc.Pallet substructure
US6955129Dec 5, 2003Oct 18, 2005The Engineered Pallot Company, LlcPlastic pallet design
US7197989May 20, 2002Apr 3, 2007Rehrig Pacific CompanyMethod of reinforcing a plastic pallet
US7273014Feb 4, 2004Sep 25, 2007General Electric CompanyHigh performance plastic pallets
US7308857Mar 9, 2005Dec 18, 2007The Engineered Pallet Company, LlcPallet substructure and pallet design
US7690315Jun 15, 2007Apr 6, 2010Rehrig Pacific CompanyNestable pallet
US7779765Feb 27, 2007Aug 24, 2010Daniel KellyPallet with telescoped leg assemblies
US8132771 *Aug 17, 2006Mar 13, 2012Anheuser-Busch Companies, Inc.Portable spacing member
US8230793Apr 2, 2010Jul 31, 2012Rehrig Pacific CompanyNestable pallet
US8651028 *Dec 15, 2012Feb 18, 2014Chep Technology Pty LimitedSeparble block shipping platform
US8701570Dec 30, 2011Apr 22, 2014Capstone Innovations, LlcExpandable modular interlocking pallet system
US20130180437 *Jul 13, 2011Jul 18, 2013A.R. Arena Products, Inc.Flex assembly of pallet base and deck
DE4301199A1 *Jan 19, 1993Jul 21, 1994Werzalit Ag & CoPallet made of fibres or chips
DE102007020277A1 *Apr 30, 2007Nov 6, 2008Schoeller Arca Systems Services GmbhMultipart plastic pallet i.e. Europool pallet, for transporting and storing goods, has upper part forming loading surface, lower part forming contact area, where parts are form-fit interconnected in inseparable manner
WO1996033919A1 *Apr 23, 1996Oct 31, 1996Lyle H ShuertPallet with plastic legs
Classifications
U.S. Classification108/56.1, 108/902
International ClassificationB29C65/58, B65D19/00
Cooperative ClassificationB65D2519/00318, B65D2519/00567, B29C65/58, B65D2519/00288, B65D2519/00412, B65D2519/00278, B65D2519/00557, B65D2519/00069, B29L2031/7178, B65D19/0012, Y10S108/902, B65D19/0038, B29C66/54, B65D2519/00407, B65D2519/00034, B65D2519/00273, B65D2519/00343
European ClassificationB29C65/58, B29C66/54, B65D19/00C1D2C1, B65D19/00C1B2A