Expandable gasket, sealed joint and method of forming same

Details Expandable gasket, sealed joint and method of forming same Expandable gasket, sealed joint and method of forming same

1994-12-29

1996-07-02

DePumpo, Daniel G.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277227, 277235B, 285335, 285363, 428913, F16J 900, F16L 1700

Patent

active

055314546

ABSTRACT:
An improved expandable gasket, sealed joint and method of forming a sealed joint which includes a gasket having at least 5% by weight unexpanded or unexfoliated graphite. The graphite material is preferably a mixture of expanded and unexpanded graphite compressed in a sheet or other shape affixed to a metal plate. The preferred composition is 5 to 70% by weight of unexpanded graphite and 30 to 95% expanded graphite, wherein the percentage of unexpanded graphite is controlled to provide the desired gasket expansion. A more preferred composition includes at least 10% by weight unexfoliated graphite or more preferably 15 to 50% by weight. The gasket is placed between the surfaces to be sealed and clamped in place. When the joint is heated, the unexpanded graphite exfoliates, causing the gasket to swell or expand, tightly sealing the joint. The expandable gasket of this invention is particularly suitable for automotive application, including head and exhaust gaskets which are subject to temperatures exceeding about 400.degree. C.

REFERENCES:
patent: 4756561 (1988-07-01), Kawata et al.
patent: 4795166 (1989-01-01), Irmler
patent: 4799956 (1989-01-01), Vogel
patent: 4813687 (1989-03-01), Nakayama et al.
patent: 5172920 (1992-12-01), Schlenk
patent: 5384188 (1995-01-01), Lebold et al.

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