Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1997-04-15
2000-03-28
Luong, Vinh T.
Machine element or mechanism
Control lever and linkage systems
Elements
74526, 74527, 74540, 254264, G05G 100, B66D 100
Patent
active
060416769
ABSTRACT:
A locking winch includes a rotatable shaft coupled to a bracket adapted for connection to a structure such as a trailer, truck, hoist, etc. Wrapped around the shaft is a cable, rope or chain and connected to one end of the shaft is a hand operated crank for rotating the shaft in a first direction for retracting the cable about the shaft or for rotating the shaft in a second, opposed direction for removing the cable from the shaft, with the crank movable between first and second positions on the shaft. A sprocket fixedly mounted to the bracket includes a plurality of spaced teeth disposed about the periphery thereof. A torsion spring coupled to the hand operated crank urges the crank to the first position. A locking pin attached to the hand operated crank is disposed between adjacent teeth on the periphery of the sprocket when the crank is in the first position to prevent rotation of the shaft and either withdrawal of the cable from or take-up of the cable on the rotatable shaft. When the crank is manually moved to the second position by overcoming the biasing force exerted by the torsion spring, the locking pin is removed from between adjacent teeth on the sprocket permitting rotation of the crank and shaft and allowing the cable to be either taken up on or removed from the shaft. The crank automatically returns to the first position when manual pressure is removed from the crank, returning the winch to the locked configuration.
REFERENCES:
patent: 1304358 (1919-05-01), Norlund
patent: 1324721 (1919-12-01), Benedict
patent: 1850513 (1932-03-01), Murphy
patent: 3765259 (1973-10-01), Firth
patent: 3934852 (1976-01-01), Weber et al.
patent: 5606849 (1997-03-01), Bettenhausen
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