Patent ID: 6155576
Filing Date: 2000-12-05
Classification: B23B,Y10T

Abstract:
A power tool having a collet assembly for securing a wider variety of tool shanks, comprising: a tool body having an output spindle with a threaded distal end, a collet receiving bore in the distal end of the spindle, a collet received in the bore having a distal end with a plurality of radially expandable and contractable jaw portions, and a proximal shank end with a plurality of radially expandable and contractable shank portions, first cam means on the distal end of the spindle for engaging and camming the jaw portions, a collet nut threadedly engaging the spindle distal end and having a second cam means for engaging and camming the jaw portions, and means to enable a greater range of radial movement of the jaw portions to secure a wider range of shank diameters including a radial chamber in the spindle collet receiving bore larder throughout its length than the collet shank portions and adjacent the collet shank portions to enable the collet shank portions to expand into the chamber as the collet jaw portions are cammed against larger tool shanks, said collet nut having an internal bore substantially larder than the jaw portions when relaxed and adjacent thereto to permit expansion of the jaw portions upon insertion of larger tool shanks.