Patent ID: 6341553
Filing Date: 2002-01-29
Classification: B23B,B23Q,Y10T

Abstract:
A chuck assembly comprising:an actuator cylinder centered on and rotatable about an axis but substantially nondisplaceable relative to the axis; a chuck housing spaced axially from the cylinder; a tubular connecting shaft extending along the axis and connected fixedly between the cylinder and the chuck housing, whereby the cylinder, connecting shaft, and chuck housing rotate jointly about the axis but do not move along the axis; a chuck piston axially displaceable in the chuck housing and having an inner end turned axially toward the actuator cylinder; an actuator piston axially displaceable in the cylinder; a shaft assembly comprising an actuator shaft fixed to the actuator piston and having an outer end and a chuck shaft having an inner end connected to the actuator-shaft outer end and an outer end connected to the chuck-piston inner end; and means including a force sensor provided between one of the inner ends and the respective outer end for detecting axial force along the shaft assembly, the one inner end bearing axially via the force sensor on the respective outer end so that axial force is transmitted between the pistons via the force sensor.