Patent ID: 7594665
Filing Date: 2009-09-29
Classification: B23B,Y10S,Y10T

Abstract:
1. A workholding chuck assembly for holding a workpiece, the chuck assembly comprising: a housing having a front face; a plurality of actuator arms in said housing, said actuator arms having a first end portion extending from said front face and operable to receive a workpiece retaining jaw thereon, a second end portion in said housing and an intermediate portion between said first and second end portions, said intermediate portion including a semi-spherical section having at least two semi-spherical surfaces with radially recessed surfaces therebetween; a plurality of non-split unitary bearings having a bore therethrough, each of said bearings being disposed around said semi-spherical section of said intermediate portion of an associated one of said actuator arms, each bore having an engaging surface that engages with said semi-spherical surfaces and at least two radially recessed pockets; and at least one actuator coupled to said second end portions and operable to drive pivotal movement of said actuator arms in said bearings to retain and release a workpiece.