Thin laminated gasket

Claim 1

A compressible gasket for sealing the cylinder bore of a high compression automobile engine and capable of maintaining its dimensional stability under the temperature and pressure conditions encountered in use in such an engine, said gasket having a total compressed thickness of less than .030 inch and comprising two outer metal sheets and filler means sandwiched between said metal sheets, said metal sheets and said filler means each having apertures in registration with one another, including combustion openings, and each lamina having generally parallel planar faces whereby each lamina is of substantially uniform thickness, said filler means including a compressible layer comprised of asbestos fibers impregnated with a binder and having a maximum compressed thickness of 0.015 inch, said filler means also including a single metal shim between said layer of fibers and one of said sheets, at least some of the apertures in said shim at said combustion openings being spaced concentrically outwardly of the registering apertures in said layer of fibers, one of said sheets having first portions extending through said last mentioned apertures and second reversely bent portions extending outwardly into a position substantially vertically aligned with last mentioned shim apertures whereby a four layer laminate is provided around said combustion openings including a double thickness of said one metal sheet, a single thickness of the other of said metal sheets, and said compressible layer thereby providing substantially uniform compressibility characteristics throughout said gasket, the exposed surfaces of said gasket being coated to provide a means for insuring that the gasket will intimately and uniformly contact the facing surfaces of a cylinder head and block.