Patent GB-916601-A (GB)
Title: Improvements in or relating to helical coil sliding clasp fasteners
IPC: B29D5/06
Filed: 1959-03-02
Abstract: 916,601. Sliding clasp-fasteners. HEILMANN, W. E. March 2, 1959 [March 12, 1958], No. 7165/59. Class 44. [Also in Groups V and IX] A helical coil sliding clasp-fastener comprises two helical coils, Fig. 2, each wound from a filament 1 of synthetic resin material, e.g. polyamide, and enmeshable together by means of a slider, the parts of the helical turns of the coils which become enmeshed being formed with coupling elements 3 which project, on each coil, beyond the diameter of the filament in the direction of the longitudinal axis of the coil, wherein each coil has a filler member 4, e.g. a textile cord, located therewithin and extending longitudinally through the turns of the coil, the filler member being resilient in its transverse direction and filling up its associated coil to such an extent that, when the coils are enmeshed together, the inwardly-directed faces of the coupling elements 3 of one coil are resiliently pressed, by the filler member of the other coil, against the inwardly-directed faces of the coupling elements 3 of the other coil, and vice versa. The coupling elements 3 are formed by deformations 2 on the coils and the deformations are such as to avoid relative displacement of the coupling elements perpendicular to the plane of the fastener. Each coil wound on its cord 4 is subsequently sewn to a stringer tape, Figs. 11 and 12 (not shown), or is woven into a stringer tape, Fig. 13 (not shown), the cord 4 constituting a warp thread of the tape. The coils and the filler members 4 may have any cross-sectional shape, and the filler members may be secured to the coils, e.g. by glue. The coils may each be made in a machine, Fig. 8, having a fixed spindle 16 through a bore 17 of which is fed the cord 4 by means of toothed rollers 30. A collar 18 is rotatably mounted on the spindle 16 and carries guides 27 and 28 and a feed device 29 for the filament 1, the latter being fed from a supply spool 21 rotatably mounted on the collar 18; the filament 1 is fed at a controlled rate either directly on to the cord 4 which would be temporarily stiffened, e.g. by starch, or on to a tube 22 surrounding the cord 4, the coils being pushed up the tube 22 by subsequent coils and so fed on to the cord 4 along which it is subsequently spaced by screws 25 and 26. The filament 1 is provided with the deformations (not shown) forming the coupling elements which are spaced along the length of the filament at distances corresponding to the pitches of the coils and these deformations may be made by driven heated rollers disposed on the collar 18. To obviate backlash on the filament 1, driven gripping rollers may be provided in association with the feed device 29 and the spool 21 may be braked by the provision of a brake lining 31, e.g. of felt, in contact with the spool. The screws 25 and 26 are disposed in a housing 24 which contains heating means whereby the coils are fixed at the desired spacing thereof on the cord 4 and the latter may be supplied with the glue through additional bores in the spindle 16. A second similar machine may be provided and the continuous coils provided by the machines brought into engagement by a slider 32 either before or after they are sewn to stringer tapes. Specifications 916,602 and 916,603 are referred to.