| 摘要 |
783,453. Sliding clasp fasteners. RYSER, E., and VOUMARD, B. March 4, 1955 [March 6, 1954; March 6, 1954], No. 6452/55. Class 44 A method of manufacturing a sliding clasp fastener comprises casting each fastening element directly on to an edge of a supporting strip so that its clasp portion covers a smaller width of the strip than is covered on the opposite side, and defirming the portion of the fastening element on the latter side towards the central longitudinal plane of the fastener so that the strip extends as far as that plane and thus covers that side of the clasp portion which, would otherwise be visible when the fastener is closed. The clasp portion of the element is defined as that part of the element which engages with the elements on the opposite strip. As shown, each element 12 is cast in a threepart mould 24. 26, 28, on to the beaded edge 22 of a supporting strip 10, the casting material being fed through a passage 29 to form two arms 30, 32 of the element, the arm 30 being formed with a projection. 37 and complementary depression 38 by which the elements are interengaged one with the other. A nose 34 on the arm 32 is deformed to clamp the element on to the strip 10. In other arrangements Figs. 5-12 (not shown), the nose 34 may be defined by a notch and the arm 32, or the arms may be plain and the clamping action obtained by a swaging operation, or the arm 32 may be flush with, or extend laterally of the arm 30. Also, the bead' portion 22 may be of a shape other than that shown on Figs. 2-4 and may be disposed symmetrically to or asymmetrically to a plane parallel to the supporting strips and passing through the centre of the arm 30. The elements may made of metal or synthetic plastic. In a further arrangement Figs. 12 to 15 (not shown), the strip is perforated, whereby the two arms of each element are joined through the strip. |
