[54] METHOD OF WELDING PLASTICS SHEETS TOGETHER AND A JOINT USED THEREIN
[75] Inventors: Masaru Kumagai; Toshikazu
Nkbimura, both of Osaka, Japan
[73] Assignee: Toua Kokyu Tugitevarubu Seizo Co., Ltd., Osaka, Japan
[21] Appl. No.: 571,655
[22] Filed: Dec 13,1995
[30] Foreign Application Priority Data
Nov. 8, 1995 [JP] Japan 7-316146
[51] Int O.6 B32B 31/26; H05B 3/10;
H05B 3/44
[52] U.S. CI 156/273.9; 156/272.2;
156/304.3; 156/304.6; 219/544; 219/547;
219/548
[58] Held of Search 156/272.2,273.9,
156/274.4. 275.1, 304.1, 304.3, 304.5, 274.2, 379.7, 304.6; 219/544, 547, 548, 539, 535,
542, 553
[56] References Cited
U.S. PATENT DOCUMENTS 2,388,297 11/1945 Slaughter 156/304.5 X
Plastics sheets having edges to be bonded one to another as well as a plastics joint having at least two weldable regions are prepared, each region having an embedded wire extending along the region. Subsequently, the plastics sheet edges are placed on or in the weldable regions, and an electric current is supplied through the wires to emit heat for fusion bonding each edge to the corresponding weldable region. Alternatively, each of the plastics sheets has at least one edge having an embedded wire so that they are welded to each other, without aid of any joint. The joint has U-shaped grooves or ear-shaped protrusions adapted to engage with the plastics sheet edges, and the wires are embedded in the grooves or protrusions.
3 Claims, 13 Drawing Sheets
