Process of molding a component of a sole unit for footwear

Details Process of molding a component of a sole unit for footwear Process of molding a component of a sole unit for footwear

1988-07-26

1989-10-24

Lorin, Hubert C.

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

264278, 2643288, 26433115, 26433119, 12142P, 12146BR, A43B 1000

Patent

active

048760536

ABSTRACT:
The process of molding a component of a sole unit for an athletic shoe comprising the steps of supporting a core of a first plastic material in a cavity of a mold, the core defining an integral part of the component and extending within a heel region toward a forefoot region, supporting at least one rigid plug member within the cavity juxtaposed and in partially surrounding relation to the core, injecting a second plastic material into the cavity to fill the cavity, to form a shell around the core, at least partially curing the injected plastic material, removing the plug member, and injecting a third plastic material which upon curing forms a second resilient plastic material having a hardness (Shore A) greater than that of the material of the core into the cavity to fill the area heretofore occupied by the plug member, the plug member being shaped such that the third plastic material forms a set of posts.

REFERENCES:
patent: 2563438 (1951-08-01), Weidner
patent: 3663679 (1972-05-01), Bane et al.
patent: 4302892 (1981-12-01), Adamik
patent: 4316335 (1982-02-01), Giese et al.
patent: 4364188 (1982-12-01), Turner et al.
patent: 4364189 (1982-12-01), Bates
patent: 4551930 (1985-11-01), Graham et al.

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