Press stud device

摘要

1,140,361. Press stud fasteners. WILLIAM PRYM-WERKE K.G. 25 Jan., 1966 (17 Feb., 1965; 1 Oct., 1965], No. 3322/66. Heading E2B. The invention relates to a fastening device of the press fastener type comprising a fastening member 35 of synthetic plastics material having an integrally formed socket or stud adapted to engage resiliently with a complementary stud or socket of a second similar fastening device, and a base integral with said stud or socket, and a metal fastening ring 21 by which the member, in use, is secured to a web of material, said ,ring comprising an annular body 271 having a plurality of prongs, 311 upstanding therefrom which prongs, in use, pierce both the supporting web 36 and the base of the fastening member, with the free ends of the prongs being bent to overlie a surface of the base of the fastening member to secure the fastening member to, the supporting web. According to the present invention, the base of the fastening member is provided within annular bead 43 over which the prongs of the fastening; ring are, in use, bent. As shown the base is also provided on the face opposite the bead with a raised central annular step portion with an outside diameter approximately equal to the internal diameter of the' fastening ring. The step portion then serves as a guide for the prongs as they pierce the base, and the annular body of the fastening ring seats around the step portion. In the embodiment shown, the prongs are first passed through a flange of the base. In an alternative embodiment the prongs are first passed through the flange from above and then through the web of material, the head being on the underside of the flange. In a further embodiment of the female member the flange is omitted and instead the prongs first pass through the web of material and then through the base of the member so that they are bent over the bead inside the socket of the member. The base, on the opposite side of the head can be formed with a groove aligned with the bead.