GB451556A - Improved method of and means for manufacturing fastening members for sliding-clasp fasteners - Google Patents

Abstract

451,556. Making fasteners. KOPPEL, L. B., 94, Greencroft Gardens, Hampstead, and REITER, B., 17A, Redbourne Avenue, Finchley, both in London. Nov. 16, 1935, No. 31806. Convention date, Nov. 17, 1934. [Classes 83 (ii) and 83 (iv)] [See also Group XXV] Die-rolling; shearing.-Interlocking members for sliding-clasp fasteners are made by feeding a strip of metal to tools, forming the interlocking devices on the strip, and pressing sideways and thus compressing the material of the strip to form the prongs without substantial waste of metal. A strip is fed between a tool e, Fig. 5, and a matrix el to form the aperture d between the prongs without waste of material, and projections and depressions z are formed by tools f, g, f<1>, g<1>. Elements are severed on the lines b by tools h, h<1> and i, i<1>. A number of strips of elements 1 ... 6, Fig. 4, are formed in a sheet of metal, the apertures d being formed by pressing sideways the material thus thickening the metal or increasing its density without waste of material. The tools may be carried on a series of rolls, the strip being notched by tools l, l<1> and l1, l<1>1, Fig. 8, and then spread sideways by tools o, Fig. 9, on rolls m, m<1> embossed by tools on rolls n2, n<1>2, Fig. 11, and finally sheared. Sets of tools may be carried on a single pair of rolls r, r<1>, co-operating with a backing-up roll r<11>, the elements being formed in the strip in a single passage, and finally sheared by cutting edges on a rotary tool q. When the elements are formed with the prongs in the closed position, cam surfaces on the tool q spread the prongs. A series of strips severed from a sheet are relatively displaced in level in order to permit the spreading of the prongs, or alternate strips are fed in opposite directions, two sets of tools being provided. Elements 1.. 6, Fig. 3, may be arranged transversely in a strip a, alternate elements pointing in opposite directions. Specification 400,027 is referred to. According to the Specification as open to inspection under Sect. 91, elements may be formed in one or several rows in strip or sheet material with alternate elements facing in opposite directions and with adjacent rows interengaging to avoid waste of material, but the material between the prongs is punched out. Elements E, E1, Fig. 19 (Cancelled), formed in a strip a, with alternate elements oppositely disposed, are applied to two tapes D, D1 simultaneously and are secured thereon by tools B, C, B1, C1, the members passing immediately to be closed by a slider to form a complete fastener. This subject-matter does not appear in the Specification as accepted.