B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
26/170
B21D 53/52 (2006.01) A44B 19/06 (2006.01) B21F 45/18 (2006.01)
Patent
CA 1188494
ABSTRACT OF THE DISCLOSURE A method of and apparatus for manufacturing coupling elements, suitable for a two-way slide fastener, successively from a rod of metal of a generally Y-shaped cross section having a base, as a prospective coupling head, and a pair of diverging legs. As the rod is fed longitudinally stepwise, it is transversely sliced into a plurality of coupling element blanks, one at a time, on the backward stroke of relative movement of a coacting cutting die and punch. At the end of the backward stroke of the cutting die and punch, a chamfering surface on the cutting punch is forced against the base of the rod to form a chamfered portion thereon so that each sliced coupling element blank has the chamfered base. The chamfered base of each coupling element blank is then formed, by a coacting forming die and punch, into a final coupl- ing head of one coupling element which head has a projection from one face and a socket in the other face at such a position that the chamfered portion is disposed around the socket.
402255
Gowling Lafleur Henderson Llp
Yoshida Kogyo K.k.
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