Two speed hydraulic door operator
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United States of America Patent
Stats
-
May 2, 1995
Grant Date -
N/A
app pub date -
Nov 12, 1993
filing date -
Nov 12, 1993
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A hydraulic door operator includes a reversible hydraulic pump driven by an electric motor and connected in a closed loop to a reversible hydraulic motor which operates the door. A bypass valve assembly is connected across the loop between the pump and hydraulic motor. The bypass valve assembly is operative when fluid is delivered by the pump to drive the motor in one direction so that a portion of the fluid flow is bypassed from reaching the motor. When the pump is operated to deliver fluid to drive the motor in the opposite direction, the bypass valve assembly is inoperative. When operative, the bypass assembly will cause the motor to be driven at a slower speed than it will be driven when the bypass valve assembly is inoperative.
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