Chucks or sockets – With fluid-pressure actuator – Socket type
Patent
1994-03-28
1995-06-20
Bishop, Steven C.
Chucks or sockets
With fluid-pressure actuator
Socket type
279 50, B23B 3120
Patent
active
054255449
ABSTRACT:
A bushingless workhead comprises a flexible drill collet inside a flexible chucking collet. The chucking collet has external frusto-conical surfaces on the ends thereof that mate with corresponding frusto-conical surfaces on a pair of pistons. The pistons are slidable within a housing away from each other to apply opposed forces to the chucking collet. The forces cause the chucking collet to collapse and to also collapse the drill collet to grip a tool inside the drill collet. One piston applies a greater force on the chucking collet than the other piston. The chucking collet is thus forced to move longitudinally in one direction, and it abuts a fixed reference surface that repeatably locates the chucking collet with each tool gripping operation prior to the chucking collet collapsing to grip the tool.
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patent: 2471921 (1949-05-01), Ashdown
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patent: 4016680 (1977-04-01), Moores, Jr. et al.
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patent: 4762447 (1988-08-01), Marantette
patent: 4791841 (1988-12-01), Pruvot et al.
patent: 4867463 (1989-09-01), Hopf
Bishop Steven C.
Giddings & Lewis, Inc.
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