Recyclable plastic pallet

• US 5,337,681 A
• Filed: 09/08/1992
• Issued: 08/16/1994
• Est. Priority Date: 07/24/1992
• Status: Expired due to Fees

• Current Assignee: Consulting Project Managers Incorporated
• Original Assignee: David A. Schrage
• Inventors: Schrage, David A.
• Primary Examiner(s): MILANO, MICHAEL J
• Application Number:
  US07/941,511
• Time in Patent Office: 707 Days
• Field of Search: 108/56.1, 108/55.5, 108/55.1, 108/51.1, 108/53.3, 108/901, 108/902, 411/508, 411/509
• US Class Current: 108/56.1
• CPC Class Codes: B65D 19/0071 forming discontinuous or non-planar contact surfaces
• CPC Class Codes: B65D 2519/00034 Plastic
• CPC Class Codes: B65D 2519/00069 Plastic
• CPC Class Codes: B65D 2519/00104 Plastic
• CPC Class Codes: B65D 2519/00293 made of more than one piece
• CPC Class Codes: B65D 2519/00298 skeleton type
• CPC Class Codes: B65D 2519/00323 made of more than one piece
• CPC Class Codes: B65D 2519/00333 contact surface having a stringer-like shape
• CPC Class Codes: B65D 2519/00373 whereby at least one spacer is made of one piece
• CPC Class Codes: B65D 2519/00393 grid type, e.g. perforated plate
• CPC Class Codes: B65D 2519/00567 mechanical connection, e.g. snap-fitted
• CPC Class Codes: B65D 2519/00572 with separate auxiliary element, e.g. screws, nails, bayonets
• CPC Class Codes: B65D 2519/00835 Integral
• CPC Class Codes: B65D 2519/0084 Separated elements, e.g. including in-moulded elements
• CPC Class Codes: B65D 2565/385 especially suited for or with means facilitating recycling

Abstract

A recyclable plastic pallet (220) upon which objects may be stacked is described. The pallet (220) comprises longitudinally spaced and laterally extending elongate front and back plastic rails (230, 232, 233, 234) having openings 258. The pallet also has laterally spaced and longitudinally extending elongate plastic slats (236) with apertures (254) therein. Retainers (238) are cooperatively received in the openings (258) of the rails (230, 232, 233, 234) and into the apertures (254) of the slats (236) to join the slats (236) and rails (230, 232, 233, 234) together to form pallet (220).

Claims

1. A pallet upon which objects may be stacked, the pallet comprising:

longitudinally spaced and laterally extending elongated front and back rails, the rails having vertically spaced top and bottom surfaces and at least one of the rails having a vertically extending opening formed therein;

laterally spaced and longitudinally extending elongate slats, at least one of the slats having an aperture formed therein; and

a retainer cooperatively held in the opening of the rail and in the aperture of the slat, the retainer including a body having at least one rib extending transverse to the opening in the rail, the opening having at least one shoulder formed therein extending traverse to the opening and the body and rib being oversized relative to the shoulder such that the rib is cooperatively received in a snap-fit manner within the shoulder to prevent the retainer from being withdrawn from the opening.

2. The pallet of claim 1 wherein the rail has a slot extending inclined to and intersecting with the opening to provide access to the rib, the shoulder being formed by the intersection of the opening and the slot.

3. The pallet of claim 1 wherein the slat has a pair of vertically and longitudinally extending flanges located on the underside thereof which sandwich about the top or bottom surface of the rail to prevent relative lateral movement between the slat and the rail.

4. The pallet of claim 1 wherein the slat and the retainer are integrally molded together.

5. The pallet of claim 1 wherein:

the rib has an inclined ramp surface leading to a bearing surface;

wherein when the retainer is inserted into the opening, the ramp surface slides along the opening with the opening enlarging to accommodate the rib and then contracting after the bearing surface has passed the shoulder with the bearing surface bearing upon the shoulder to prevent withdrawal of the retainer from the opening.

6. The pallet of claim 5 wherein the rib is triangular in cross-section.

7. The retainer of claim 1 wherein the body of the retainer is non-circular in cross-section.

8. The retainer of claim 1 wherein the rib is elongate and extends horizontally.

9. The retainer of claim 1 wherein:

the retainer includes two discrete opposing ribs located on opposite sides of the body of the retainer and the opening has two shoulders formed therein, the ribs interlocking with the shoulders to prevent withdrawal of the retainer from the opening.

10. A pallet upon which objects may be stacked, the pallet comprising:

longitudinally spaced and laterally extending elongate front and back rails, the rails having vertically spaced top and bottom surfaces and at least one of the rails having an opening formed therein;

laterally spaced and longitudinally extending elongate slats, at least one of the slats having an aperture formed therein; and

a retainer cooperatively held in the opening of the rail and in the aperture of the slat, thereby joining the slat and rail together;

wherein at least one of the rails has a notch in at least one of its top or bottom surfaces, the notch having an undercut and the slat having a laterally outward extending flange, the flange and the undercut cooperating to form an interlocking joint retaining the slat within the notch of the rail.

11. A method of joining a slat to a rail in a recyclable plastic pallet, the method comprising the steps of:

molding a slat having an aperture;

molding a rail having an opening including a shoulder extending transverse to the opening;

molding a retainer having a body with a rib thereon, the body and rib being oversized relative to the shoulder of the opening;

inserting the retainer into the aperture of the slat and into the opening of the rail with the rib passing into the opening and being received within the shoulder of the opening in a snap-fit manner, thereby cooperatively interlocking the slat, the rail and retainer to one another.

12. The method of claim 11 wherein the rail includes a slot extending transverse to and intersecting with the opening of the rail, the shoulder being formed by the intersection of the opening and the slot.

13. The method of claim 11 wherein the slat includes a laterally outward extending flange and the rail has a notch including an undercut, the undercut and the laterally outward extending flange cooperatively interlocking with one another to retain the slat to the rail.

14. A pallet upon which objects may be stacked, the pallet comprising:

longitudinally spaced and laterally extending elongate front and back rails, the rails having vertically spaced top and bottom surfaces and at least one of the rails having an opening formed therein;

laterally spaced and longitudinally extending elongate slats, at least one of the slats having an aperture formed therein; and

a retainer cooperatively held in the opening of the rail and in the aperture of the slat, thereby joining the slat and rail together;

wherein at least one of the rails has a notch in at least one of its top or bottom surfaces, the slat and the retainer being received within the notch such the slat, the retainer and the rail form a flush surface on the pallet.

15. The pallet of claim 14 wherein the slat, the rail and the retainer have both longitudinal and laterally extending interlocking stepped surfaces which interlock with one another to prevent the slat from moving laterally or longitudinally relative to the rail.

16. A method for removing and replacing a slat from a rail of a recyclable plastic pallet, the slat having an aperture formed therein, the rail having an opening with a shoulder formed therein, and a retainer, the retainer having a head and a body with a rib thereon, the head being cooperatively held in the aperture of the slat and the rib being cooperatively held in the shoulder of the opening, the method comprising:

cutting the slat between the retainer and the rail;

removing the slat from the rail;

removing the rib from the retainer;

withdrawing the retainer from the rail;

placing another slat, having an aperture, upon the rail; and

inserting another retainer into the aperture of the slat and into the opening of the rail to retain the second slat to the rail.

17. A method for removing and replacing a slat from a rail of a recyclable plastic pallet, the slat having an aperture formed therein, the rail having an intersecting opening and a slot extending transverse thereto forming a shoulder at the intersection of the opening and slot, and a retainer which fastens the slat to the rail, the retainer having a body with a rib thereon, the body and rib being oversized relative to and received within the shoulder of the opening in a snap-fit manner to retain the retainer within the slat and rail, the method comprising:

accessing the rib through the slot and removing the rib from the retainer;

withdrawing the retainer from the opening and aperture;

removing the slat from the rail;

withdrawing the retainer from the rail;

placing a second slat, having an aperture, upon the rail; and

inserting a second retainer having a rib thereon into the aperture of the a second slat and into the opening of the rail with the rib of the second retainer being captured within the shoulder of the opening to retain the second slat to the rail.