Patent GB-594640-A (GB)
Title: Improvements in or relating to separable fasteners
IPC: A44B19/40
Filed: 1944-05-06
Abstract: 594,640. Slide fasteners. WINTERHALTER, M. May 6, 1944, No. 8627. Convention date, April 15, 1943. Addition to 571,691. [Class 44] In a slide fastener as described in the parent Specification the fastener elements are correctly spaced on the carrier by the provision of shoulders on the carrier. A carrier 1, Fig. 1, of thermoplastic substance such as polyamide, of circular, rectangular or triangular crosssection is upset against the fastener elements of zinc or thermoplastic substance threaded on it, to form shoulders 6. The fastener is sewn to the article of clothing &c. by means of studs 5. The shoulder may be formed. by die-pressing with the application of heat. In modifications the shoulders are formed by deflecting the carrier upwardly or downwardly with the application of heat. In another modification the carrier, between the fastener elements is pierced and expanded by means of a pointed tool. In a further modification the fastener elements are mounted on a carrier formed of two threads which are forced apart between the elements and the space thus formed filled with a substance which sets. In the modification shown in Fig. 10 the carrier is inserted in a groove 16 in the fastener elements and a projection 18 is pressed against it to compress it and form shoulders on the carrier on each side. The fastener elements have points 21 adapted to be driven through the article of clothing and locked by a surface 22. In a modification of this construction the groove 16 is formed in the under surface of the fastener element. In another modification the fastener elements are provided with apertures so that they may be strung on an auxiliary thread first, to facilitate insertion of the carrier in the grooves 16, and the carrier 26 is formed with recesses 29, Fig. 14, which may be trapezoidal or triangular, to receive the fastener elements. The auxiliary thread may be finally removed. The fastener elements are connected to the article of clothing thrusting the pointed end 32, Fig. 13, through the material 31 of the clothing, a thread 34 is then threaded through apertures in the elements at the rear of the material. A still further modification shows the carrier twisted about its longitudinal axis to form the shoulders. In Fig. 17 the carrier 45 is gripped between the jaws 42, 43. In Fig. 20 the carrier is inserted in a groove 50 and shoulders 51 are upset across it. The carrier 49 is flattened and formed with recesses, by rolling or pressing, where the fastener elements are to be attached. A number of modifications of the fastener element are shown provided with additional means in the groove 50 for maintaining the elements on the carrier. In Fig. 26 this comprises ribs 54 in the groove 50. The other modifications show channels in the groove 50 or a combination of ribs and channels or one or two pointed projections or a groove at the bottom of the groove 50. Three forms of carrier are shown in which recesses to receive the fastener elements are formed by pressing a thread of polyamide of round cross-section to flattened or square cross section at intervals. A carrier formed of several threads twisted together is shown. A thread or several threads may be spun round the carrier. The fastener elements may be cast or threaded on the carrier.