Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1985-11-14
1988-01-19
Ward, Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277124, 277125, F16J 1510
Patent
active
047201134
ABSTRACT:
An annular multilayer seal including a series of more than two successive layers of elastomeric material. The layers vary in hardness in the axial direction of the seal, the outermost layers being the hardest and the innermost layer being the softest. Where the seal has at least five layers, the hardness of each layer between the innermost layer and each outermost layer is about the average of the hardnesses of the innermost and outermost layers. The innermost layer may have a trapezoidal cross-sectional shape, the major base of the trapezoid being at the inside surface of the seal. The thickness of the other layers may vary nonlinearly from the inside surface to the outside surface of the seal. The innermost layer has a Shore Durometer A Scale hardness of between 40 and 75, the outermost layer has a Shore Durometer A Scale hardness of between 70 and 95, and where there are at least five layers, each layer between the innermost layer and one of the outermost layers has a Shore Durometer A Scale hardness of between 70 and 90.
REFERENCES:
patent: 1964237 (1934-06-01), Wheeler
patent: 2857972 (1958-10-01), Baker
patent: 3554563 (1971-01-01), Schumacher et al.
patent: 4161319 (1979-07-01), Stocking
patent: 4328974 (1982-05-01), White et al.
patent: 4433847 (1984-02-01), Weinberg
patent: 4524981 (1985-06-01), Hertz
Levine Alan H.
Seals Eastern Inc.
Ward Robert S.
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