GB723998A - Improvements in sliding clasp fasteners - Google Patents

Abstract

723,998. Sliding-clasp type fasteners. MULKA, F. April 3, 1952 [June 14, 1951], No. 8534/52. Class 44. In a sliding-clasp fastener of the kind in which fastener elements 5 are arranged in channels formed by the material 17 (Fig. 1) of the stringer, the elements 5 and surrounding material 17 are embraced by separate stirruplike members 19. The mode of engagement of adjacent elements, under the action of the slide 27 (Fig. 1), is shown in Fig. 2 (in which all other parts of the fastening are omitted). The elements 4 have four inclined faces 11 to 14 as viewed in Fig. 1. At least one of these faces may alternatively be disposed at right angles to the neck 6 of the element 5. The engaging surfaces 8, 9 (Fig. 2) of the elements may be straight, as shown, or curved. A plurality of the elements may be formed by swarfless shaping, machining, or bending from a single bar, as shown in Fig. 3a. The elements may be separated during, or after assembly, of the fastening, by bending or stanping. The assembly may be effected by the action of pressure rollers. The stirrup members 19 may be similarly made and assembled (Fig. 3b, not shown). The inner surface of the members 19 may be roughened, or complementary recesses and projections may be formed on the members 19 and elements 5. The joint at the edge of the stringer material may be secured by sewing, adhesive or solder. The stringer may comprise the actual material which the fastener is intended to join. In a modified construction (Figs. 4a, 4b, not shown), the plane of the free end of each stringer, lies in the plane of one of the outer faces of the corresponding member 19. In a further modification, the slide 27 may engage the outer surface of the stirrup members 19 instead of the elements 5. The end faces of the stirrup members 19, may be inclined with respect to a direction perpendicular to the axis of symmetry of the fastener. By this means, the stirrup members may be made to present an unbroken bearing surface to the slide 27. This inclination may be increased to the extent of making the members 19 of triangular shape.