Reinforced plastic pallets

• US 6,199,488 B1
• Filed: 10/07/1997
• Issued: 03/13/2001
• Est. Priority Date: 10/07/1997
• Status: Expired due to Term

• Current Assignee: Orbis Corporation (Menasha Corporation)
• Original Assignee: Cookson Plastic Molding Corporation
• Inventors: Funk, Robert, Favaron, James, Settergren, Bruce
• Primary Examiner(s): Chen, Jose V.
• Application Number:
  US08/946,013
• Time in Patent Office: 1,253 Days
• Field of Search: 108/57.25, 108/57.26, 108/901, 108/902, 108/56.1, 108/51.11
• US Class Current: 108/57.25
• CPC Class Codes: B65D 19/0012 forming a continuous plane contact surface
• 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 2519/00273 made of more than one piece
• CPC Class Codes: B65D 2519/00288 made of one piece
• CPC Class Codes: B65D 2519/00303 Cell type, e.g. honeycomb
• CPC Class Codes: B65D 2519/00308 grid type, e.g. perforated plate
• CPC Class Codes: B65D 2519/00318 made of one piece
• CPC Class Codes: B65D 2519/00338 contact surface having a discrete foot-like shape
• CPC Class Codes: B65D 2519/00358 Cell type, e.g. honeycomb
• CPC Class Codes: B65D 2519/00373 whereby at least one spacer is made of one piece
• CPC Class Codes: B65D 2519/00432 Non-integral, e.g. inserts B65D2519/00462 takes precedence
• CPC Class Codes: B65D 2519/00562 chemical connection, e.g. glued, welded, sealed
• CPC Class Codes: B65D 2519/008 Drainage means
• CPC Class Codes: B65D 2519/0084 Separated elements, e.g. including in-moulded elements
• CPC Class Codes: Y10S 108/901 Synthetic plastic industrial platform, e.g. pallet

Abstract

A reinforced plastic pallet is disclosed. The pallet is characterized in that it is formed of an upper deck, a lower deck, and reinforcing elements. The reinforcing elements are retained on the lower deck in a manner that allows relative movement between the reinforcements and the deck.

Claims

1. A reinforced plastic pallet comprising:

a) an upper deck formed of a plastic material having a first coefficient of thermal expansion, the upper deck having an upper surface, a lower surface, a front edge, a back edge substantially parallel to the front edge, first and second side edges which are substantially parallel to one another and a plurality of legs extending substantially perpendicularly downward from the lower surface;

b) a lower deck formed of a plastic material having substantially the first coefficient of thermal expansion, the lower deck having an upper surface, a lower surface, a front edge, a back edge substantially parallel to the front edge, first and second side edges which are substantially parallel to one another and a plurality of sockets sized and positioned to mate with the legs extending from the upper deck;

the lower deck further including a plurality of channels formed in its upper surface; and

c) a plurality of reinforcing elements having a second coefficient of thermal expansion different from the first degree of expansion, wherein each channel contains a reinforcing element, and further wherein at least one reinforcing element is capable of lateral movement within its channel independent of and relative to the upper and lower decks due to the different first and second coefficients of thermal expansion to minimize stress forces on the pallet.

2. The reinforced plastic pallet of claim 1, wherein each reinforcing element comprises a composite structural member of fiberglass reinforced plastic.

3. The reinforced plastic pallet of claim 2, wherein the reinforcing elements are fabricated from a pultrusion process.

4. The reinforced plastic pallet of claim 1, wherein each reinforcing element has an I-shaped cross sectional configuration.

5. The reinforced plastic pallet of claim 1, wherein the channels are positioned substantially adjacent to the front, back and side edges of the lower deck.

6. The reinforced plastic pallet of claim 5, which further includes a central channel extending substantially perpendicularly between the channels at the front and back edges and through the center of the deck.

7. The reinforced plastic pallet of claim 6, which further includes two subcentral channels, each extending substantially perpendicularly between the channels at the first and second sides and toward the center of the deck.

8. The reinforced plastic pallet of claim 5, which further includes a central channel extending substantially perpendicularly between the channels at the first and second side edges and through the center of the deck.

9. The reinforced plastic pallet of claim 8, which further includes two subcentral channels, each extending substantially perpendicularly between the channels at the front and back sides and toward the center of the deck.

10. The reinforced plastic pallet of claim 1, wherein the upper deck is secured to the lower deck by bolting, welding or adhering.

11. The reinforced plastic pallet of claim 1, wherein the upper deck is provided with a plurality of anti-slip plugs which extend between the upper and lower surface of the upper deck.

12. The reinforced plastic pallet of claim 11, wherein the anti-slip plugs are fabricated of rubber.

13. The reinforced plastic pallet of claim 1, wherein the upper deck includes nine legs, one leg extending downward from each comer, one leg extending downward from the middle of each edge, and one leg extending downward from the center.

14. The reinforced plastic pallet of claim 13, wherein the lower deck includes nine leg receiving sockets, one socket positioned at each comer, one socket positioned at the middle of each edge, and one socket positioned at the center.

15. The reinforced plastic pallet of claim 1, wherein at least one channel includes a plurality of retainers to retain a reinforcing element in a manner which allows relative movement between the channel and the reinforcing element, the retainers being staggered along alternate sides of the channels.

16. The reinforced plastic pallet of claim 1, wherein each channel includes a plurality of retainers to retain a reinforcing element in a manner which allows relative movement between the channel and the reinforcing element, the retainers being staggered along alternate sides of the channels.

17. The reinforced plastic pallet of claim 1, wherein each socket includes a drainage port.