Expansible chamber devices – Resilient means interposed between working member and...
Patent
1988-06-20
1990-01-02
Garrett, Robert E.
Expansible chamber devices
Resilient means interposed between working member and...
92140, 74110, 74516, 269 32, 279 4, F16J 110
Patent
active
048905410
ABSTRACT:
A fluid-operated actuator for collets, vises, chucks and other workpiece engagement devices, for example, the actuator having a piston which moves the engagement device toward the workpiece with a force equal to product of the area of the face of the piston times the pressure of a fluid applied to the face. When the engagement device has engaged the workpiece, additional, relatively slight movement of the piston causes a force multiplying mechanism to provide increased engagement force without increasing the pressure of the actuating fluid. The overall travel of the actuator mechanism is not limited by the force-mulitplying mechanism which begins to function only after the unrelated distance of travel of the engagement device to the workpiece. Thus, for example, compressed air at ordinary shop pressures may be used to actuate collets or chucks on automatic lathes or the like to provide relatively high clamping forces.
REFERENCES:
patent: Re25334 (1963-02-01), Michalak, Jr.
patent: 2134227 (1938-10-01), Forkardt
patent: 3042289 (1962-07-01), Mikina
patent: 3272087 (1966-09-01), Culver
patent: 4621568 (1986-11-01), Gailey
Crozier John H.
Garrett Robert E.
Williamson Mark A.
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