Apparatus for shaping coiled slide fastener coupling elements

Details Apparatus for shaping coiled slide fastener coupling elements Apparatus for shaping coiled slide fastener coupling elements

1983-04-06

1985-02-26

Lieberman, Paul

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Convoluting or twisting means

425319, 425393, B28B 1108

Patent

active

045015473

ABSTRACT:
A coupling element shaper comprises a pair of parallel externally threaded screw members corotatable in a common direction and disposed on opposite sides of a mandrel along which a core thread is fed while a filamentary material is wound around the mandrel into a row of helically coiled coupling elements. Each screw member has a portion varying in pitch to gradually reduce in a direction from one end to the opposite end thereof. The core thread is squeezed by the coupling elements as shaped by such portion so as to have a certain degree of stretchability which can cancel or take out its shrinkage when the coupling elements are sewn to a slide fastener stringer tape.

REFERENCES:
patent: 3137037 (1964-06-01), Wilcken
patent: 3262157 (1966-07-01), Fujisaki
patent: 3353217 (1967-11-01), Bashover
patent: 4002278 (1977-01-01), Omori et al.
patent: 4325184 (1982-04-01), Omori

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