Patent ID: 6726222
Filing Date: 2004-04-27
Classification: B23B,B25B,Y10T

Abstract:
A drill chuck comprising:a chuck body centered on an axis and forming an axially forwardly open bit-receiving recess; means forming at a base of the recess an axially forwardly open polygonal-section seat; a plurality of jaws spaced angularly around the recess forward of the seat; tightening means for displacing the jaws radially inward and outward, whereby the jaws can grip a bit in the recess; an element displaceable in the base of the recess between a blocking position in front of the polygonal-section seat and preventing entry of a bit thereinto and a freeing position clear of the seat and permitting entry of a bit thereinto; and actuating means on the chuck body for displacing the element between the blocking and freeing positions.