Patent ID: 7644931
Filing Date: 2010-01-12
Classification: B23B,Y10S,Y10T

Abstract:
1. A chuck comprising: a drive shaft extending along and rotatable about an axis; a housing part adjacent the drive shaft and generally nonrotatable about the axis; a chuck body fixed to and rotatable with the shaft and formed with a plurality of guides; respective jaws shiftable in the guides between closely spaced inner positions and widely spaced outer positions; an adjustment sleeve surrounding the body, coupled to the jaws, and rotatable about the axis relative to the body to shift the jaws between their positions; latch means including an array of seats distributed angularly about the axis and fixed relative to the adjustment sleeve and two angularly spaced radially shiftable buttons movable relative to the housing part and manually shiftable between a coupled position for rotationally locking the adjustment sleeve to the housing part and a decoupled position for rotation about the axis of the adjustment sleeve relative to the housing part; a single arcuate leaf spring engaged around the adjustment sleeve, bearing radially outward on both of the buttons, and urging the buttons radially outward into a position disengaged from the seats; and coupling means connected to the latch means for decoupling the latch means from the housing when, in the coupled position, a torque exerted between the housing and the chuck body exceeds a predetermined limit.