GB512715A - Method of forming castings such as sliding-clasp fasteners, on a stringer, by the injection-moulding of thermoplastic material - Google Patents

Abstract

512,715. Fastenings. MORIN, L. H., and MARINSKY, D. March 4, 1938, No. 6863. Convention date, March 18, 1937. [Class 44] [Also in Group V] In forming castings upon a mounting, such as fastener elements upon a stringer tape 10, die elements 31 are intermittently moved in contact with spaced sections of the stringer and thermoplastic material is injected into a mould cavity 30 between the dies 31 selectively from separate hoppers 13, 13a. The hoppers are mounted in a casing 12 and provided with apertured feed slides 14 operated from plungers 28. The hoppers may contain differently coloured material. The feed slides are adapted to register with discharge tubes 21 leading to apertures 22 in heating cylinders 18 in a movable block 19. The plungers 28 feed the material in the cylinders and inject into the mould. The cylinders are adapted to be selectively registered with the mould orifice 41. The block 19 is mounted on a slideway 33 and is moved by a roller 35 engaging a cam 36 rotating on a shaft 37. The cam is so contoured as to move a cylinder 18 into and out of register with the mould orifice a predetermined number of times before changing to the other cylinder 18, the arrangement being such that single fasteners or groups, as of four, are arranged on the stringer alternately in different colours. The cylinders are maintained against the die block by a spring 42 and 'are heated electrically as at 23. The fasteners are successively stripped from :a core 47 and the stringer 10 fed forward. The gate may be removed by a member 49. The stringer is coated with solvent or cement sucked from a container 53. Specifications 512,714; 512,750 and 512,751, [both in Group V], are referred to.