Method for molding ear cushions

Details Method for molding ear cushions Method for molding ear cushions

1979-11-05

1981-04-07

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

179182R, 179184, 264321, B29D 2700

Patent

active

042605750

ABSTRACT:
Ear cushions for headphones are formed from an open cell polyurethane foam material. An ear cushion blank is cut from the material and compressed to a desired shape between a holder and a forming tool. Heated air is forced through the porous material to set it to a contoured shape. The molding process can be performed quickly without damaging the cellular structure.

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patent: 2468721 (1949-04-01), Volkmann
patent: 2529562 (1950-11-01), Martin
patent: 2622159 (1952-12-01), Herman
patent: 2802214 (1957-08-01), Hanks
patent: 2878153 (1959-03-01), Hacklander
patent: 2977426 (1961-03-01), Noyes et al.
patent: 3084229 (1963-04-01), Selsted et al.
patent: 3236328 (1966-02-01), Burroughs
patent: 3378432 (1968-04-01), Spencer
patent: 3406235 (1968-10-01), Trogdon et al.
patent: 3586794 (1967-11-01), Michaells
patent: 3593341 (1971-07-01), Aileo

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