Control device for hydraulic winch

Details Control device for hydraulic winch Control device for hydraulic winch

2007-01-23

2007-01-23

Ho, Ha (Department: 3681)

Interrelated power delivery controls, including engine control

Brake control

Brake engaged when engine energy deactivated, brake...

C477S184000, C477S185000, C254S361000, C254S377000

Reexamination Certificate

active

11014832

ABSTRACT:
According to a control device for a hydraulic winch, a regulator controls a motor capacity of a hydraulic motor having variable capacity functioning as a driving source of the hydraulic winch in response to a load pressure, a negative brake stops and retains the hydraulic motor at an automatic shutoff for prevention of overloading, and a controller sends signals to the regulator via a regulator-controlling valve at the automatic shutoff to set the motor capacity at a large value. Thus, the delay to recover the motor capacity at the time of returning from the automatic shutoff that is activated during winding-up of a load does not occur, and a control response is increased.

REFERENCES:
patent: 3799302 (1974-03-01), Workman et al.
patent: 3848716 (1974-11-01), Hanning
patent: 5806838 (1998-09-01), Kalve et al.
patent: 6371447 (2002-04-01), Imanishi et al.
patent: 6648303 (2003-11-01), Nishimoto et al.
patent: 2001-317442 (2001-11-01), None
patent: 3326116 (2002-07-01), None

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