Plastic pallet

• US 5,845,588 A
• Filed: 10/30/1996
• Issued: 12/08/1998
• Est. Priority Date: 01/11/1996
• Status: Expired due to Fees

• Current Assignee: Borealis AS (Ineos AG)
• Original Assignee: Borealis AS (Ineos AG)
• Inventors: Gronnevik, Oddbjorn
• Primary Examiner(s): Chen, Jose V.
• Application Number:
  US08/739,642
• Time in Patent Office: 769 Days
• Field of Search: 108/51.1, 108/901, 108/902, 108/56.3, 108/51.11, 108/57.27, 108/57.26, 108/57.25, 108/57.28, 108/57.34
• US Class Current: 108/57.27
• CPC Class Codes: B65D 19/0026 and each contact surface having a stringer-like shape
• CPC Class Codes: B65D 19/0048 and each contact surface having a stringer-like shape
• 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 2519/00288 made of one piece
• 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 2519/00557 without separate auxiliary elements
• CPC Class Codes: B65D 2519/00562 chemical connection, e.g. glued, welded, sealed
• CPC Class Codes: B65D 2519/00791 handles, handgrip holes
• CPC Class Codes: Y10S 108/901 Synthetic plastic industrial platform, e.g. pallet

Abstract

A pallet fabricated made of a thermoplastic material is produced by joining together individually fabricated structural components, each individually thermoformed from an extruded plastic parison of a multilayer structure. The structural components include a deck in the form of a continuous sheet with longitudinal and transverse sides, one or more upper runner components fastened by their top side to the bottom of the deck, each of which includes a cross member with downward-facing posts, and one or more lower runner components, each of which includes a cross member with upward-facing posts and which is fastened by the tops of its posts to the bottoms of matching posts on the corresponding upper runner components.

Claims

1. A pallet made of a thermoplastic material, the pallet fabricated by joining together a plurality of individually fabricated structural components, each of the structural components being individually thermoformed from an extruded plastic parison having a multilayer structure, the structural components comprising:

(a) a deck (2) in the form of a continuous sheet having a longitudinal side (14), a transverse side (15), and top and bottom surfaces,

(b) at least one upper runner component (3) having top and bottom surfaces, each said upper runner component (3) comprising a cross member (8) having downward-facing posts (7) and being fastened by its said top surface to said bottom surface of said deck (2), and

(c) at least one lower runner component (4), each said lower runner component (4) comprisinq a cross member (8) having upward-facing posts (7), each said upward-facing post fastened to one said downward-facing post of a corresponding said upper runner component (3).

2. A pallet according to claim 1 wherein at least one said upper runner component (3) fastened to one said lower runner component (4) is positioned along said longitudinal side (14) and along said transverse side (15).

3. A pallet according to claim 2 wherein one said upper runner component (3) fastened to one said lower runner component (4) is positioned along a said transverse side and has a length substantially equal to said second length.

4. A pallet according to claim 1 wherein at least one of said top surface of each said upper runner component and the part of said deck to which said upper runner component is fastened is formed with a longitudinal recess, so that a straight open channel (9) is created between said upper runner component and said deck.

5. A pallet according to claim 4 wherein each said channel (9) is sealed at each end so that a closed hollow space is created.

6. A pallet according to claim 4 wherein a stiffening section is inserted into one or more of said channels (9).

7. A pallet according to claim 1 wherein the extruded multilayer structure is fabricated from a thermoplastic selected from polyolefins, PVC, ABS, styrene plastics, PA and PC.

8. A pallet according to claim 7 wherein said thermoplastic is reinforced with a reinforcing material selected from cut glass fibers and continuous glass fibers, said reinforcing material running in the direction of extrusion.

9. A pallet according to claim 1 wherein the extruded multilayer structure comprises a foamed plastic layer having a solid skin on one side thereof.

10. A pallet according to claim 9 wherein said foamed layer and said solid skin are coextruded so that they create an integrated multilayer structure.

11. A pallet according to claim 9 wherein said foamed layer and said solid skin are made of different materials.

12. A pallet according to claim 9 wherein said extruded multilayer structure comprises at least one polyolefin material.

13. A pallet according to claim 12 wherein said foamed layer has a closed cell structure.

14. A pallet according to claim 1 the extruded multilayer structure comprises at least one foamed plastic layer having a solid skin on both sides thereof.

15. A pallet according to claim 1 wherein the structural components are joined together by butt welding.

16. A pallet according to claim 1 wherein the structural components are joined together by the use of a material selected from glue and adhesive.

17. A pallet according to claim 1 wherein the structural components are joined together mechanically by one or more fastening means selected from snap-together arrangements, clips, bolts made of plastic, and bolts made of metal.

18. A pallet according to claim 1 wherein at least one of said top and bottom surfaces of said deck are furnished with a plurality of parallel, raised longitudinal sections made of a coextruded friction material.

19. A pallet according to claim 18 wherein said bottom surface of said upper runner component is furnished with one or more raised longitudinal sections made of a coextruded friction material.

20. A pallet according to claims 18 or 19 wherein said friction material is a polyolefin material.

21. A pallet according to claim 20 wherein said polyolefin material is EVA.

22. A pallet according to claims 17 or 18 wherein said parallel, raised longitudinal sections have a height of about 1 mm and a width of from narrow strips to a continuous facing.

23. A pallet according to claims 1, 2, or 4 wherein said deck includes one or more structures selected from raised areas and recesses made to fit articles that are to be disposed on the pallet.

24. A pallet made of a thermoplastic material, the pallet fabricated by joining together a plurality of individually fabricated structural components, each of the structural components being individually thermoformed from an extruded plastic parison having a multilayer structure, the structural components comprising:

(a) a deck (2) in the form of a continuous sheet having two longitudinal sides (14) of a first length, two transverse sides (15) of a second length, and top and bottom surfaces,

(b) at least two upper runner components (3), each said upper runner component comprising top and bottom surfaces and a cross member (8) having downward-facing posts (7), having a length substantially equal to said second length, and being fastened by said top surface to said bottom surface of said deck (2), each said upper runner component disposed substantially parallel to a said transverse side, and

(c) at least two lower runner components (4) comprising a cross member (8) having upward-facing posts (7), each said upward-facing post fastened to one said downward-facing post of a corresponding said upper runner component (3).

25. A pallet according to claim 24 wherein one said upper runner component (3) fastened to one said lower runner component (4) is positioned along at least each said transverse side (14) of said deck.

26. A pallet according to claim 25 wherein one said upper runner component (3) fastened to one said lower runner component (4) also is positioned along a said longitudinal side and has a length substantially equal to said first length.

27. A pallet made of a thermoplastic material, the pallet fabricated by joining together a plurality of individually fabricated structural components, each of the structural components being individually thermoformed from an extruded plastic parison having a multilayer structure, the structural components comprising:

(a) a deck (2) in the form of a continuous sheet having two longitudinal sides (14) of a first length, two transverse sides (15) of a second length, and top and bottom surfaces,

(b) at least two upper runner components (3), each said upper runner component comprising top and bottom surfaces and a cross member (8) having downward-facing posts (7), one said upper runner component having a length substantially equal to said second length, being fastened by its said top surface to said bottom surface of said deck (2), and disposed substantially parallel to a said transverse side, and the other said upper runner component having a length substantially equal to said first length, being fastened by its said top surface to said bottom surface of said deck (2), and disposed substantially parallel to a said longitudinal side, and

(c) at least two lower runner components (4) comprising a cross member (8) having upward-facing posts (7), each said upward-facing post fastened to one said downward-facing post of a corresponding said upper runner component (3).