| 摘要 |
1417886 Sliding-clasp-fasteners OPTI-HOLDING AG 6 April 1973 [7 April 1972] 16564/73 Heading E2S A row of interconnected coupling elements for a sliding-clasp-fastener comprises a strip of extruded plastics material 3 at least a part of the strip being hollow and formed with coupling elements 2 by deforming the hollow part into the shape required for the interlocking elements. Figs. 1, 2, show an extruded plastics strip 3 of hollow profile section which has flanges 4 for attachment to a stringer tape, not shown, and which is formed, along one edge, with interlocking members 2 shaped as shown in Figs. 3, 4. The geometry of the members 2 can be varied provided that, when fitted to the slider of a sliding-clasp-fastener, they provide adequate resistance to tearing open by longitudinal and transverse pull. In a modification, Figs. 6, 8, a flattened part 5 of the hollow profile section 3A forms a stringer tape which may have reinforcing, textile, inserts. The coupling elements 2 are formed by expanding, or by flattening, the hollow section such that there is wall-to-wall contact with the coupling elements formed between the flattened areas. A strip 3, produced by extruding a strip from the nozzle 7 of a worm extrusion press 6, Fig. 9, is placed under internal pressure, or inflated, and is then fed to forming rolls 8, 9 which may be heated, to form the coupling elements 2. |
