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

• Current Assignee: Kabushiki Kaisha Sanko Vinyl Kogyosho
• Original Assignee: Kabushiki Kaisha Sanko Vinyl Kogyosho
• Inventors: Fukuichi, Miwa
• Primary Examiner(s): Grosz, Alexander
• Assistant Examiner(s): Nicholson, Eric K.
• Application Number:
  US07/108,826
• Time in Patent Office: 581 Days
• Field of Search: 5/455, 5/458, 5/456, 5/457, 5/472, 5/477, 5/449, 156/292, 156/73.1
• US Class Current: 5/655.3
• CPC Class Codes: A47C 27/081 of pneumatic type
• CPC Class Codes: A47C 27/087 with means for connecting opposite sides, e.g. internal ties or strips
• CPC Class Codes: B63C 11/04 Resilient suits

Abstract

A technical object of this invention is to hold down an inflation of an air cushioned portion of an air filled product required to have a high pneumatic pressure of the air chamber with extremely high load F. For the purpose, in a core structure according to this invention in the middle portions of an upper side leather cloth sheet a pair of core members (4) of a double layer structure (1'"'"', 2'"'"') identical with the leather cloth sheets (1, 2) is provided, and each core member (4) is fused to each of the upper side and lower side leather cloth sheets at both end portion (5), and middle portions (6) of a pair of core members (4) are sewn with a yarn (7) to be coupled. The core structure according to this invention is particularly suitable for holding down the inflation of bouyance adjusting apparatus for scuba diving and the like.

Claims

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.

2. The improved core structure of claim 1 wherein each of said plastic sheets comprises a polymeric plastic selected from the group consisting of a polyurethane and a polyvinyl polymer or copolymer.

3. The improved core structure of claim 1 wherein each of said cloth sheets includes nylon.

4. The improved core structure of claim 1 wherein the cloth sheet and the plastic sheet associated with each of said leathery type sheets are joined together by adhesive means.

5. In a method of manufacturing a core structure for holding down an inflation of an air filled product wherein said air filled product includes upper and lower leathery type sheets, the improved method comprising the steps of

(a) forming said upper and lower leathery type sheets (3) by joining together a plastic sheet (2) which can be fused by high frequency waves and a cloth sheet (-),

(b) forming a core member for insertion between said upper and lower leathery type sheets, said core member including a pair of leathery type sheets (4) each made of a double layer construction substantially identical to the double layer construction of said upper and lower leathery type sheets (3),

(c) bonding together said pair of leathery type sheets (4) forming said core member by positioning the cloth sheets (1) associated respectively therewith towards each other and sewing together with yarn (7) the central region (6) associated respectively therewith,

(d) disposing said core member between said upper and lower leathery type sheets (3),

(e) applying pressure from the upper part of the upper leathery type sheet (3) of the air filled product, and

(f) fusing and bonding together the respective end portions (5) of said core member to the upper and lower leathery type sheets (3) by applying high frequency wave voltage.

6. The improved method of claim 5 wherein each of said plastic sheets comprises a polymeric plastic selected from the group consisting of a polyurethane and a polyvinyl polymer or copolymer.

7. The improved method of claim 5 wherein each of said cloth sheets includes nylon.

8. An improved core structure for holding down an inflation of an air filled product comprising a first pair of spaced apart flexible sheet members forming the upper and lower members of said air filled product, each of said first pair of flexible sheet members including a cloth sheet and a high frequency wave fusible plastic sheet, at least one core member positioned between said first pair of flexible sheet members, said core member including a second pair of flexible sheet members each including a cloth sheet and a high frequency wave fusible plastic sheet, said core member being positioned between said first pair of flexible sheet members such that the high frequency wave fusible plastic sheet associated with one of said second pair of flexible sheet members is positioned adjacent to the high frequency wave fusible plastic sheet associated with one of said first pair of flexible sheet members and the high frequency wave fusible plastic sheet associated with the other of said second pair of flexible sheet members is positioned adjacent to the high frequency wave fusible plastic sheet associated with the other of said first pair of flexible sheet members, each of the flexible sheet members of said core member having portions adjacent the respective ends thereof which are fusible with the respective flexible sheet members associated with said first pair of flexible sheet members, said second pair of flexible sheet members being coupled together at an intermediate location along the respective lengths thereof.

9. The improved core structure of claim 8 wherein said second pair of flexible sheet members are coupled together by stitching.

10. The improved core structure of claim 8 wherein said second pair of flexible sheet members are coupled together by riveting.

11. The improved core structure of claim 8 including a plurality of core members positioned between said first pair of flexible sheet members.

12. A method for manufacturing a core structure for holding down an inflation of an air filled product, said air filled product including upper and lower flexible sheet members, said improved method comprising the steps of

(a) forming the upper and lower flexible sheet members of said air filled product by joining together a high frequency wave fusible plastic sheet and a cloth sheet,

(b) arranging said upper and lower flexible sheet members in spaced apart relationship such that the high frequency wave fusible plastic sheets associated respectively therewith are positioned towards each other,

(c) forming a core member for positioning between the upper and lower flexible sheet members of said air filled product, said core member including a second pair of flexible sheet members, each of said second pair of flexible sheet members being of a construction substantially similar to the construction of the upper and lower flexible sheet members associated with said air filled product and each including a high frequency wave fusible plastic sheet and a cloth,

(d) arranging said second pair of flexible sheet members such that the cloth sheets associated respectively therewith are positioned towards each other,

(e) coupling together said second pair of flexible sheet members at an intermediate location therealong,

(f) disposing said core member between the upper and lower flexible sheet members of said air filled product such that the high frequency wave fusible plastic sheet associated with one of the flexible sheet members of said core member is positioned adjacent to the high frequency wave fusible plastic sheet associated with one of said upper and lower flexible sheet members and the high frequency wave fusible plastic sheet associated with the other flexible sheet member of said core member is positioned adjacent to the high frequency wave fusible plastic sheet associated with the other of said upper and lower flexible sheet members,

(g) applying pressure from the upper portion of said upper flexible sheet member, and

(h) fusing together the respective end portions of said second pair of flexible sheet members to the upper and lower flexible sheet members by applying high frequency wave voltage.