Pneumatically driven clamping device, in particular a machine vi

Details Pneumatically driven clamping device, in particular a machine vi Pneumatically driven clamping device, in particular a machine vi

1981-09-21

1983-12-06

Watson, Robert C.

Work holders

With fluid means

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

B25B 114

Patent

active

044188994

ABSTRACT:
A pneumatically driven clamping device, in particular a machine vice, has a clamping member movable in the clamping direction in a stationary housing and an adjusting arrangement for coarse adjustment of the clamping member in the clamping direction with respect to the stationary housing. Between the adjusting arrangement and the clamping member in a drive housing there is provided a power amplifier with a primary element to which pneumatic pressure can be admitted, an abutment provided at one end of the power amplifier and connected to the adjusting arrangement, and a secondary element movable in the clamping direction at the other end of the power amplifier and acting on the clamping member. In the drive housing a wedge is provided which is movable transversely of the clamping direction of the power amplifier, is disposed between the secondary element of the power amplifier or its abutment and the respectively adjoining part to separate them in the clamping direction and is driven by a pneumatic piston and cylinder unit whose pressure chamber is connected in series with the pressure chamber of the primary drive element via a connecting duct and an adjustable excess-pressure valve arranged in this duct.

REFERENCES:
patent: 2140658 (1938-12-01), Van Sittert
patent: 2424090 (1947-07-01), Gordinier
patent: 2530085 (1950-11-01), Shaff
patent: 2803157 (1957-08-01), Seitter
patent: 3484094 (1969-12-01), Arnold
patent: 3941362 (1976-03-01), Arnold et al.
patent: 3958493 (1976-05-01), Fujita et al.
patent: 4354421 (1982-10-01), Sims

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