Patent ID: 7175184
Filing Date: 2007-02-13
Classification: B23B,Y10T

Abstract:
1. A holder for holding a tool on a longitudinal axis and with said tool having a shank with a recess, comprising: a split collet disposed circumferentially about and being rotatable about said axis and having a body portion and fingers extending from said body portion and parallel to said axis and being radially movable relative to said axis and having an end distal from said body portion, said body portion having a socket for reception of said tool shank and for transmitting rotational drive to said tool and about said axis, a sleeve co-extensively surrounding said collet and being slidable on said collet along said axis and extending circumferentially over said tool shank recess and said fingers, said fingers and said sleeve having mutually engagable camming surfaces for urging said fingers radially toward said axis upon sliding said sleeve in the direction of said distal end and thereby have said fingers radially clamp said tool, a spring for urging said sleeve toward said distal end, a detent ball on said sleeve adjacent said body portion and located to be disposed in said tool shank recess when said sleeve has urged said fingers radially inwardly, a ball-engaging surface on said sleeve to be in contact with said ball in a first axial position of said sleeve to position said ball into said tool shank recess and thereby hold said tool against movement along said axis and said sleeve having a relief located to receive said ball in a second axial position of said sleeve and thereby release said ball from said tool shank recess, and wherein an axially spaced-apart relative position of said camming surfaces when in contact with each other and that of said ball engaging surface is such that said camming surfaces are rotationally clamping said tool when said ball engaging surface has positioned said ball in said recess.