Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article
Patent
1987-06-15
1989-09-19
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Making hole or aperture in article
264127, 264139, 264262, 264268, 277134, 277152, 277153, B29C 4322, B29C 4304
Patent
active
048679267
ABSTRACT:
A lip-type oil seal for use with a rotary shaft is manufactured by a method wherein different elastomeric materials for forming respectively the sealed liquid side and the atmospheric side of a tip portion of a sealing lip of the oil seal have different moduli of elasticity or hardnesses and are placed in a superposed condition within a mold prepared for vulcanization molding the oil seal. The mold is then clamped and the materials are heated and compressed so that an elastomeric material is fluidized and is vulcanization molded together with the other material to form an integral structure while a surplus portion is allowed to remain on the atmospheric side, thereby forming a sealed liquid side surface of the sealing lip. After the fluidized material has been hardened, the mold is opened and the surplus portion is then cut off, thereby forming an atmospheric side surface of the sealing lip.
REFERENCES:
patent: 4300777 (1981-11-01), Symont
patent: 4406847 (1983-09-01), O'Neal et al.
patent: 4464322 (1984-08-01), Butler
Lowe James
NOK Corporation
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