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US 4,535,998 AGranted
Sealing device for hydraulic energy dissipator of the telescopic type
AssigneeCreusot-Loire
InventorMaurice Katz
Life of this patent
Estimating the term…
Abstract
Sealing device for an hydraulic energy dissipator of the telescopic type, formed by a seal comprising a cylindrical ring which grips the rod of the piston and which is extended by a fluid-tight bellows so as to permit axial movement of the seal in its housing following small amplitude movements of the rod. The device is useful for railway suspension shock absorbers.
Claims8
Sealing device for an hydraulic energy dissipator of the telescopic type, comprising
- (a) a working cylinder filled with liquid and divided into two chambers by an axially moving piston provided with calibrated valves determining the hydraulic resistance, a piston rod of said piston being guided through a first end of said cylinder;
- (b) an annular compensating chamber surrounding said working cylinder and communicating through a valve and a calibrated valve with said working chamber adjacent the end of said cylinder remote from said piston rod;
- (c) a fluid-tight seal for the exit of said piston arranged in a housing extending said working cylinder on the rod side, said fluid-tight seal being formed from a cylindrical ring which grips said piston rod and which is extended by a fluid-tight bellows, coaxial with said rod, enabling axial movement of said seal in said housing.
Dependencies are inferred from the claim text.