Work holders – Holder mounted for movement – Including means to shift holder position
Patent
1974-07-16
1976-01-06
Smith, Al Lawrence
Work holders
Holder mounted for movement
Including means to shift holder position
269 19, 269 71, 200 6147, 214 1Q, B23Q 104, B25B 122
Patent
active
039306437
ABSTRACT:
A workholder or roll-over fixture including a primary supporting structure and a pair of workholding elements mounted for rotation in the structure about a fixed axis of rotation and providing a work-receiving area therebetween. The workholder is particularly suitable for servicing and maintaining large and heavy machinery. The workholder includes a control system including a sensing means that is sensitive to out of balance forces within the workholder caused by rotation of the workpiece when held by the workholding elements and movement of the center of gravity of the workpiece relative to the axis of rotation. This control system also preferably includes a device mounted on one of the workholding elements which is adapted to sense the attitude thereof. The sensing means provides an output signal, which is sent through the attitude sensing device, indicative of the out of balance forces. Adjusting means are responsive to this output signal and effect positional adjustment of the workholding elements on the structure relative to the axis of rotation. This positional adjustment tends to decrease and remove the out of balance forces by moving the center of gravity closer to the axis of rotation. The preferred adjusting means include a hydraulic motor and lead screw mounted in and on each of the workholding elements.
REFERENCES:
patent: 2166410 (1939-07-01), Jackson
patent: 2224958 (1940-12-01), Faber
patent: 3155219 (1964-11-01), Sterrett
patent: 3190463 (1965-06-01), Cohan
patent: 3236535 (1966-02-01), Barber
patent: 3669409 (1972-06-01), Eranosian
patent: 3710955 (1973-01-01), Redman
Smith Al Lawrence
Watson Robert C.
Wescan Mining Trucks & Equipment Ltd.
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