B - Operations – Transporting – 21 – F
Patent
B - Operations, Transporting
21
F
26/168
B21F 45/18 (2006.01) A44B 19/06 (2006.01) B21D 53/52 (2006.01)
Patent
CA 1124497
- 13 - Abstract of the Disclosure: A method for manufacturing slide fastener elements from a metal strip by press working, each element comprising a head portion and a pair of spaced leg portions extending rearwardly from the head portion is disclosed. The head por- tion includes on each side of the top and bottom surfaces thereof a first projection extending substantially perpen- dicular to the longitudinal direction of the leg portions and a pair of second projections each extending from near one end of the first projection to rearward. The method comprises the steps of preparing a metal strip having two parallel ridges provided on each side of the top and bottom surfaces thereof and extending the length of the strip, deform- ing the ridges on each side of the strip at predetermined spaces so as to intimately contact two ridges to each other at predetermined spaces to thereby form a series of first semi-worked projections and leaving a series of second remained projections between the first semi-worked projections, deform- ing the first semi-worked projections and second remained projections to make the first projections and second projec- tions respectively and simultaneously reducing the thickness of the inside and outside portions defined by the first semi- worked projections and the second remained projections to less than that of the leg portions so that the excess material of the reduced portions flow to contribute to the formation of the first and second projections, forming the external shape of the leg portions by punching the strip, and separat- ing the strip into individual fastener elements by punching the same.
340233
Gowling Lafleur Henderson Llp
Yoshida Kogyo K.k.
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