Brakes – Internal-resistance motion retarder – Valve structure or location
Patent
1989-06-07
1990-11-27
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Valve structure or location
188317, 188282, 18832222, F16F 934
Patent
active
049729292
ABSTRACT:
The bidirectional valve assembly provides for selection of retraction and extension damping characteristics which can accommodate relatively large separation of damping curves. Two cooperable valve discs or ring members are provided which function in unison to resist fluid flow in a first fluid flow direction, while a single one of the valve ring members functions primarily to resist fluid flow in the other direction. In a first embodiment, one of the two cooperable valve ring members comprises a compliant retainer or fulcrum against which the other valve ring member moves in unison therewith to produce relatively low damping in retraction. The other valve ring member moves alone in extension to produce relatively high damping. In an alternative embodiment, the two cooperable valve ring members are superimposed and move in unison during extension, as dictated by their combined stiffness. In retraction, fluid passes through openings in one of the valve ring members for contact with and movement of the other, relatively compliant valve ring member.
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Ivers Douglas E.
Schwemmer Leonard J.
Butler Douglas C.
Lord Corporation
McCombs David L.
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