Hydraulic clamp

Details Hydraulic clamp Hydraulic clamp

1988-11-01

1990-08-14

Watson, Robert C.

Work holders

With fluid means

Cylinder-piston means in series with additional positioning...

269309, B23Q 302

Patent

active

049481053

ABSTRACT:
A hydraulic clamp, which actuates a clamping means by a hydraulic pressure of a hydraulic cylinder, has a clamping actuation oil chamber, a piston and the clamping means arranged in a cylinder body of the hydraulic cylinder in this order in the axial direction of the hydraulic cylinder. The clamping means is adapted to be shifted expansively and contractively between advanced position clamping and a retracted position (unclamping) which are at different distances from the axis of the hydraulic cylinder. The clamping means is adapted to be advanced from the retracted position to the advanced position in an early stage of the application of a hydraulic actuation force in the clamping actuation oil chamber, by which the piston is hydraulically actuated, and the clamping means is adapted to be actuated for clamping by a latter stage of the hydraulic pressure in the clamping actuation oil chamber.

REFERENCES:
patent: 4504046 (1985-03-01), Yonezawa et al.
patent: 4577847 (1986-03-01), Schedwin
patent: 4688974 (1987-08-01), Wright et al.

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