Clamping device

Details Clamping device Clamping device

1986-08-26

1987-10-06

Schmidt, Frederick R.

Work holders

With fluid means

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

269 20, B23Q 308

Patent

active

046978003

ABSTRACT:
A clamping device, for use for example for clamping a tool or workpiece in position in a machine tool comprises a clamping anchor to which a clamping force is applied by a hydraulically operated cylinder. The device also includes a screw operated compensating or back-up unit which acts on the piston of the hydraulic cylinder. The compensating unit is driven by the same hydraulic system as the hydraulic cylinder and when the piston has been moved hydraulically to apply the clamping force to the anchor, a screw component of the compensating unit moves into engagement with the piston to lock the piston in position and maintain the clamping force even if the hydraulic pressure on the piston is then released.

REFERENCES:
patent: 2681581 (1954-06-01), Pearson
patent: 2966820 (1961-01-01), Huyett
patent: 3663115 (1972-05-01), Vindez et al.
patent: 4080716 (1978-03-01), Vom Dorp

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