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Core structure and method of its manufacture

  • US 4,823,417 A
  • Filed: 09/22/1987
  • Issued: 04/25/1989
  • Est. Priority Date: 01/30/1986
  • Status: Expired due to Fees
First Claim
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1. In a core structure for holding down an inflation of an air filled product wherein said air filled product is made of leathery type sheets, the improved core structure comprising upper and lower leathery type sheets (3), each leathery type sheet (3) being of a double layer construction and each being formed by joining together a cloth sheet (1) and a high frequency wave fusible plastic sheet (2), said plastic sheets (2) being positioned toward the inside portion of said air filled product, a plurality of pairs of leathery type sheets (4) being provided as core members for said air filled product, each of said pairs of leathery type sheets (4) being of a double layer construction substantially identical to the double layer construction of said upper and lower leathery type sheets (3), each of said plurality of pairs of leathery type sheets (4) being positioned between said upper and lower leathery type sheets (3) such that the high frequency wave fusible plastic sheets (2'"'"') associated respectively therewith are positioned in opposed relationship with the high frequency wave fusible plastic sheets (2) associated with said upper and lower leathery type sheets (3), each leathery type sheet (4) having its opposite end portions (5) fused respectively with the corresponding upper and lower leathery type sheets (3), and each of said pairs of leathery type sheets (4) being bonded in a central region thereof by sewing with yarn.

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