Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1987-08-07
1989-06-06
Halvosa, George E. A.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
18832215, 251282, 251319, 267127, 280714, F16F 934
Patent
active
048363421
ABSTRACT:
The piston of the damper, which is of the piston-and-cylinder type, has therein at least one fluid passageway, a pair of fluid inlet/outlet ports opening from one end of the piston and communicating with the passageway at spaced locations along its length, an outlet/inlet port opening from the opposite end of the piston and communicating with the passageway at a location along its length intermediate the locations of the inlet/outlet ports, and a valve element mounted within the passageway for movement transversely thereof between an open-valve position, where the valve element permits relatively free flow of fluid through the passageway, and a closed-valve position wherein the valve element obstructs the fluid flow. The valve element has at least one pressure-equalizing opening extending therethrough and is substantially pressure balanced in a plurality of orthogonal directions. The valve element is driven by an actuator which may be and preferably is a linear actuator of a springless single acting type.
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Halvosa George E. A.
Lord Corporation
LandOfFree
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