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US 4,867,460 AGranted
Hydraulic jack seal assembly
AssigneeWestinghouse Electric Corp.
InventorsSteven Colo, Sanjivkumar K. Patel, Melanie J. Smith
Life of this patent
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AssigneeWestinghouse Electric Corp.
InventorsSteven Colo, Sanjivkumar K. Patel, Melanie J. Smith
Estimating the term…
A hydraulic elevator jack having a cylinder, a cylinder head, a plunger, and an improved seal assembly disposed between the cylinder head and plunger. The seal assembly includes a compartmentalized sleeve which axially separates a wear ring and a sealing function, with the wear ring being disposed closer to the cylinder, i.e., on the oil or pressure side of the cylinder head, than the sealing function. The wear ring is discontinuous, having at least first and second spaced ends, providing improved distribution of load on the wear ring while reducing drag and tendency of the wear ring to bind. The sealing function includes at least one O-ring energizing seal having a main body portion, and a discontinuous, elastomeric, solid body O-ring disposed in a cavity defined by the body portion. The O-ring is preferably centered relative to the axial dimension of a sealing surface of the main body portion.
In a hydraulic elevator jack having a longitudinal axis, a cylinder, a cylinder head having a pressure side, and a fluid actuated plunger mounted for axial movement within the cylinder and cylinder head, the improvement comprising:
In a hydraulic elevator jack having a longitudinal axis, a cylinder, a cylinder head having a pressure side, and a fluid actuated plunger mounted for axial movement within the cylinder and cylinder head, the improvement comprising:
Dependencies are inferred from the claim text.