Swing drive with automatic shut-down control

Details Swing drive with automatic shut-down control Swing drive with automatic shut-down control

1975-10-22

1977-03-22

Spar, Robert J.

Traversing hoists

Overhead

Cable

60468, 60484, 74409, 92130C, 214138C, B66C 2386

Patent

active

040131742

ABSTRACT:
A load handling device is disclosed having an improved swing drive assembly including a hydraulically driven pivotally mounted swing drive pinion biased against a segmented ring gear by a hydraulic actuator with a guide roller adjacent the pinion engaging a guide flange concentric with the ring gear to limit the maximum tooth engagement between the pinion and ring gear and thereby provide essentially constant backlash on the pinion gear regardless of eccentricities or other irregularities in the ring gear during swing drive operation. When the swing drive pump is shut down a bypass valve is automatically actuated shunting the flow of hydraulic fluid around the pump and a spring operates to counteract the separating force between the pinion and ring gear due to wind induced rotating force which produces torque on the pinion as a result of the back pressure in the motor and the shunted supply-return lines.

REFERENCES:
patent: 1829807 (1931-11-01), McMurrin
patent: 2983226 (1961-05-01), Livermore
patent: 3949881 (1976-04-01), Morrow

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