B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/113
B29D 5/00 (2006.01) B29C 45/00 (2006.01) B29C 45/13 (2006.01)
Patent
CA 1283261
ABSTRACT OF THE DISCLOSURE A method of making an injection-molded slide fastener slider includes a first injection-molding step for forming a slider body having an integral arch-shaped support lug and a second injection-molding step for forming a pull tab threaded through a transverse hole in the support lug. For pivotal connection of the pull tab with the support lug, a mold used for achieving the method includes a combination of a main slide core and an auxiliary slide core slidably associated therewith. In the first injection-molding step, the auxiliary slide core is held in a first position in which the two slide cores jointly have a shape corresponding to the shape of the transverse hole while blocking fluid communication between first and second mold cavities in which the slider body and a body of the pull tab are formed respectively. Then the auxiliary slide core is moved to a second position in which a third mold cavity corresponding in shape to a pintle of the pull tab and communicating with the second mold cavity is defined between the slide cores and the underside of the already molded lug. Thereafter, the second injection-molding step is carried out.
561598
Ida Kazuo
Minami Hiroo
Gowling Lafleur Henderson Llp
Ykk Corporation
LandOfFree
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