Control device for hydraulic drive winch
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 18, 2003
Grant Date -
N/A
app pub date -
Nov 2, 2000
filing date -
Nov 25, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A winding-down side pilot port of a control valve is of a 2-port construction comprising a normal winding-down side port having a large pressure receiving area and a free fall side port having a small pressure receiving area, wherein in the free fall operation carried out by setting a motor to a small capacity, a pilot pressure of a winding-down side remote control valve is supplied to the free fall side port through a mode switching valve. Thereby, a stroke of the control valve can be suppressed so that a speed of a motor does not exceed an allowable speed.
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Family
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Cited Art Landscape
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