Patent ID: 6397727
Filing Date: 2002-06-04
Classification: B23B

Abstract:
A pivot-chuck actuator comprising:a housing extending along an axis and formed centered on the axis with a piston chamber and a vane chamber offset and separate from the piston chamber; a piston axially displaceable in the piston chamber; a shaft axially fixed to the piston and extending from the housing on the axis; a vane element on the shaft and angularly subdividing the vane chamber into a pair of angularly offset compartments; formations rotationally coupling the vane element to the shaft for joint rotation therewith while permitting relatively axial movement of the vane element and shaft; means for alternately pressurizing the compartments and thereby rotating the vane element and shaft about the axis; and a pair of counterweights angularly fixed on the shaft and axially flanking the vane element.