Method of making injection-molded slide fastener sliders

Details Method of making injection-molded slide fastener sliders Method of making injection-molded slide fastener sliders

1988-03-07

1988-12-13

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264250, 425DIG34, 249142, B28B 716, B29D 500

Patent

active

047909730

ABSTRACT:
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.

REFERENCES:
patent: 2509278 (1950-05-01), Scheuermann et al.
patent: 2705345 (1955-04-01), Epple
patent: 2736062 (1956-02-01), Scheuermann et al.

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