Metallic slide fastener element and method for manufacturing...

Details Metallic slide fastener element and method for manufacturing... Metallic slide fastener element and method for manufacturing...

2008-01-29

2008-01-29

Brittain, James R. (Department: 3677)

Buckles, buttons, clasps, etc.

Zipper or required component thereof

Interlocking surface constructed from plural elements in series

C024S403000, C024S405000

Reexamination Certificate

active

07322075

ABSTRACT:
A metallic slide fastener element in which an exposed portion outside of an element is finished uniformly with a high smoothness and the fixing strength to a fastener tape is intensified, and a method for effectively manufacturing the same element, wherein a metallic flat type wire rod is placed on a die and the flat type wire rod is punched out with a punch so as to produce a slide fastener element, and at this time, a mouth on a punch side of the die or a peripheral edge of the die is chamfered at a radius of 0.01 to 1.0 mm and a clearance between the punch and the die is set to 0 to 30 μm, so that an element, which has a cut surface comprising a shear surface of 80% or more and a fracture surface of less than 20% and is suitable as a slide fastener to be attached to a high quality product, is obtained.

REFERENCES:
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patent: 4010520 (1977-03-01), Yoshida
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patent: 1-80012 (1989-05-01), None
patent: 09017929 (1997-01-01), None

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