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
Patent
1990-12-13
1992-04-21
Shoap, Allan N.
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
264127, 264268, 264273, 277 35, 277 37, 425DIG47, B29C 4318, B29D 3100, F16J 1532
Patent
active
051065657
ABSTRACT:
A hermetically sealing apparatus comprises: a first seal ring made of a rubber-like resilient material and adapted to seal two members which rotate relative to each other; a second seal ring made of a resin and disposed adjacent to the first seal ring on the atmosphere side; and a backup ring secured to the first seal ring. The backup ring has a flange for clamping both the first and second seal rings. The flange is provided with a plurality of holes in such a manner that a portion of the second seal ring contacting the flange bites into the plurality of holes owing to a molding pressure of the first seal ring.
REFERENCES:
patent: 2208482 (1940-07-01), Victor
patent: 2249141 (1941-07-01), Johnson
patent: 2867457 (1959-01-01), Riesing et al.
patent: 3270373 (1966-09-01), Jagger et al.
patent: 4126320 (1978-11-01), Pendleton
patent: 4131285 (1978-12-01), Denton et al.
patent: 4159298 (1979-06-01), Bainard
patent: 4171561 (1979-10-01), Bainard et al.
NOK Corporation
Shoap Allan N.
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