Method of forming a pallet

• US 5,391,251 A
• Filed: 01/28/1992
• Issued: 02/21/1995
• Est. Priority Date: 05/15/1990
• Status: Expired due to Term

• Current Assignee: Lyle H. Shuert
• Original Assignee: Lyle H. Shuert
• Inventors: Shuert, Lyle H.
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): Lorin, Francis J.
• Application Number:
  US07/826,842
• Time in Patent Office: 1,120 Days
• Field of Search: 156/210, 156/292, 156/196, 156/293, 156/227, 264/545, 108/51.1, 108/901
• US Class Current: 156/292
• 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 2519/00034 Plastic
• CPC Class Codes: B65D 2519/00069 Plastic
• CPC Class Codes: B65D 2519/00273 made of more than one piece
• CPC Class Codes: B65D 2519/00293 made of more than one piece
• CPC Class Codes: B65D 2519/00323 made of more than one piece
• CPC Class Codes: B65D 2519/00343 contact surface being substantially in the form of a panel
• 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 2519/00557 without separate auxiliary elements
• CPC Class Codes: B65D 2519/00562 chemical connection, e.g. glued, welded, sealed
• 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
• CPC Class Codes: Y10T 156/1025 to form undulated to corrugated sheet and securing to base with parts of shaped areas out of contact

Abstract

A method is provided for forming a pallet including thermoforming a pair of plastic sheets and then fusing the two sheets together to form the pallet. One of the two sheets is thermoformed to provide a series of pin assemblies with each pin assembly including a plurality of hollow pin portions extending outwardly. The second sheet is thermoformed to provide a series of leg portions that define a corresponding series of grooves in the sheet, each groove corresponding to a respective pin assembly of the first sheet. The first sheet is assembled with the second sheet such that each pin assembly of the first sheet rests nestingly within the respective groove of the second sheet and then the material of the pin assemblies are fused to the material of the respective grooves. Web portions of the first sheet interconnect adjacent pin portions and are formed as folds extending outwardly in the same direction as the pin portions, but to a lesser extent.

Claims

1. A method of forming a pallet comprising:

thermoforming a first plastic sheet to provide a main body planar portion and a series of leg portions extending downwardly from said main body portion and defining a respective series of grooves opening in the upper face of said main body portion;

thermoforming a second plastic sheet to provide a main body planar portion corresponding generally in size and configuration to said first sheet main body portion and a plurality of hollow pins extending downwardly from said second sheet main body portion, opening in the upper face of said second sheet main body portion, and arranged to form a series of pin assemblies with each pin assembly comprising a plurality of pins arranged in a configuration corresponding generally in size and configuration to a respective groove; and

nestingly inserting each pin assembly into a respective groove and fusing material of the pin assembly to material of the groove to form the pallet.

2. A method according to claim 1 wherein the pins of each pin assembly are arranged in an annular configuration and wherein the leg portions are formed to define a series of annular grooves for nesting receipt of the respective annular pin assemblies.

3. A method according to claim 1 including the further step of:

forming a base plastic structure; and

fusing the base structure to the bottoms of the leg portions of said first plastic sheet.

4. A method according to claim 3 wherein:

said step of forming a base plastic structure comprises;

thermoforming a third plastic sheet to provide a main body planar portion and a series of leg portions extending upwardly from said main body portion and defining a respective series of grooves opening in the lower face of said third sheet main body portion;

thermoforming a fourth plastic sheet to provide a main body planar portion corresponding generally in size and configuration to said first, second and third sheet main body portions and a plurality of hollow pins extending upwardly from said fourth sheet main body portion, opening in the lower face of said fourth sheet main body portion, and arranged to form a series of pin assembly with each pin assembly comprising a plurality of pins arranged in a configuration corresponding generally in size and configuration to a respective third sheet groove; and

nestingly inserting each fourth sheet pin assembly into a respective third sheet groove and fusing material of the pin assembly to material of the groove to form the base structure.

5. A method according to claim 4 wherein said step of fusing the base structure to the bottoms of the top portions of said first sheet comprises fusing the tops of the leg portions of said third sheet to the bottoms of the leg portions of said second sheet.

6. A method of forming a pallet comprising:

thermoforming a first plastic sheet to provide a generally planar main body portion, a plurality of hollow pin portions extending downwardly from said main body portion and opening in the upper face of said main body portion, and web portions interconnecting pairs of adjacent pin portions;

thermoforming a second plastic sheet; and

fusing said second plastic sheet to the bottoms of said pin portions;

each web portion being formed as a fold extending downwardly from said main body portion to a location above the bottoms of said pin portions with adjacent portions of the fold fused together to form a seam in the upper face of said main body portion.