Reinforced plastic pallets and methods of fabrication

• US 5,868,080 A
• Filed: 11/18/1996
• Issued: 02/09/1999
• Est. Priority Date: 11/18/1996
• Status: Expired due to Term

• Current Assignee: Orbis Corporation (Menasha Corporation)
• Original Assignee: Engineered Polymers Corp. (Commercial Plastics Company)
• Inventors: Darst, Daniel, Wyler, Craig Steven, Moseman, Russell Leroy
• Primary Examiner(s): Chen, Jose V.
• Application Number:
  US08/751,401
• Time in Patent Office: 813 Days
• Field of Search: 108/57.25, 108/57.26, 108/57.27, 108/57.28, 108/901, 108/902, 108/51.11, 108/56.1
• US Class Current: 108/57.25
• CPC Class Codes: B65D 19/0022 forming a continuous plane contact surface
• 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 19/0095 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 2519/00268 made of one piece
• CPC Class Codes: B65D 2519/00273 made of more than one piece
• CPC Class Codes: B65D 2519/00288 made of one piece
• CPC Class Codes: B65D 2519/00318 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 2519/00343 contact surface being substantially in the form of a panel
• CPC Class Codes: B65D 2519/00363 grid type, e.g. perforated plate
• CPC Class Codes: B65D 2519/00373 whereby at least one spacer is made of one piece
• CPC Class Codes: B65D 2519/00407 on the load supporting surface
• CPC Class Codes: B65D 2519/00412 on the base surface
• CPC Class Codes: B65D 2519/00432 Non-integral, e.g. inserts B65D2519/00462 takes precedence
• CPC Class Codes: B65D 2519/00437 on the load supporting surface
• CPC Class Codes: B65D 2519/00442 on the base surface
• 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 2519/00567 : mechanical connection, e.g. snap-fitted
• CPC Class Codes: B65D 2519/00572 : with separate auxiliary element, e.g. screws, nails, bayonets
• CPC Class Codes: Y10S 108/901 : Synthetic plastic industrial platform, e.g. pallet

Abstract

A reinforced plastic pallet construction and assembly method are presented wherein multiple reinforcing bars are employed, at least some of the reinforcing bars having an exposed surface at a top surface, underneath surface or bottom surface of the pallet. In addition to functioning as a reinforcing member, the exposed surfaces of the reinforcing bars comprise an anti-skid surface for maintaining positioning of payload on the pallet or facilitating transport of the pallet, e.g., via a forklift or automated transport system. Various techniques for retaining the reinforcing bars within channels formed in the plastic pallet body are described. The reinforcing bars preferably comprise composite structural members of fiberglass reinforced plastic fabricated from a pultrusion process.

Claims

1. A reinforced plastic pallet comprising:

a molded plastic pallet body having multiple channels formed therein; and

multiple reinforcing bars comprising composite structural members of fiberglass reinforced plastic fabricated from a pultrusion process, each reinforcing bar being sized to reside within a different channel of said multiple channels formed in the molded plastic pallet body;

at least one of the multiple channels being configured such that when at least one of the multiple reinforcing bars is positioned therein, a surface of the reinforcing bar is exposed.

2. The reinforced plastic pallet of claim 1, wherein each reinforcing bar has a rectangular-shaped, I-shaped, H-shaped, U-shaped or T-shaped cross-sectional configuration.

3. The reinforced plastic pallet of claim 2, wherein the molded plastic pallet body having multiple channels formed therein comprises a top deck having multiple channels formed therein, and the reinforced plastic pallet further comprises multiple pallet runners secured to a lower surface of said top deck, said multiple pallet runners operating to at least partially retain said multiple reinforcing bars within said multiple channels in said top deck.

4. The reinforced plastic pallet of claim 1, wherein said molded plastic pallet body having multiple channels formed therein comprises a top deck having multiple channels formed therein, and said reinforced plastic pallet further comprises a bottom deck secured to a lower surface of said top deck, said bottom deck secured to said top deck operating to at least partially retain said multiple reinforcing bars within said multiple channels in said top deck.

5. The reinforced plastic pallet of claim 4, further comprising means for securing said bottom deck to said top deck proximate to said multiple reinforcing bars, said bottom deck comprising a single unitary support structure.

6. The reinforced plastic pallet of claim 1, wherein at least one reinforcing bar of said multiple reinforcing bars is retained within at least one of said multiple channels, said at least one reinforcing bar being positioned in said at least one channel in a manner such that a planar surface of the reinforcing bar is exposed, the exposed planar surface being substantially parallel with an upper surface or a lower surface of the molded plastic body.

7. A method for assembling a reinforced plastic pallet comprising:

providing a molded plastic pallet body having at least one channel formed in a surface thereof;

placing at least one reinforcing bar within the at least one channel formed in the molded plastic pallet body, said at least one reinforcing bar being sized and positioned in said at least one channel in a manner such that a surface of the reinforcing bar is exposed at said surface of said molded plastic pallet body; and

applying a retainer to secure said at least one reinforcing bar within said at least one channel.

8. The method of claim 7, wherein said molded plastic pallet body of said providing step comprises a top deck, and said applying a retainer comprises securing a bottom deck to said top deck to retain said at least one reinforcing bar within said at least one channel, said at least one channel being formed in a lower surface of said top deck.

9. The method of claim 8, wherein said securing of said bottom deck to said top deck is accomplished by bolting or welding said bottom deck to said top deck, at least some bolts or welds being adjacent to said at least one reinforcing bar to ensure retainment of said at least one reinforcing bar between said top deck and said bottom deck.

10. The method of claim 7, wherein said providing step comprises providing a molded plastic pallet body having at least one opening in a side surface thereof for inserting/removing of said at least one reinforcing bar, and said applying a retainer comprises providing a side positioning member disposed partially over said surface of said molded plastic pallet body, said side positioning member having a retainer depending partially over said side surface of said molded plastic body having said opening therein, said retainer having an opening corresponding to the opening in said side surface of said molded plastic pallet body and aligning therewith, and said method further comprises securing a snap clip within the aligned openings of the retainer and the side surface to secure the at least one reinforcing bar within the at least one channel of the molded plastic pallet body.

11. A reinforced plastic pallet comprising:

a molded plastic pallet body having multiple channels formed therein; and

multiple reinforcing bars comprising composite structural members of fiberglass reinforced plastic fabricated from a pultrusion process, each reinforcing bar being sized to reside within a different channel of said multiple channels formed in the molded plastic pallet body;

wherein at least one reinforcing bar of said multiple reinforcing bars is retained within at least one of said multiple channels, said at least one reinforcing bar being positioned in said at least one channel in a manner such that a planar surface of the reinforcing bar is exposed, the exposed planar surface being substantially parallel with an upper surface or a lower surface of the molded plastic body.