Abstract: A collet chuck assembly includes a chuck body carrying a collet retaining ring for receiving the threaded rear end of a standard collet. The collet retaining ring is secured to the chuck body and held against both axial and radial movement relative to the chuck body by a plurality of radially extending fasteners having inner, tapered portions received by correspondingly tapered holes in the retaining ring. A longitudinally or axially displaceable closing sleeve compresses the collet jaws when the sleeve is moved inone axial direction and releases the jaws when moved in the other axial direction. Axial displacement of the closing sleeve is effected by a collet actuator including a plurality of longitudinal fingers extending through openings in the collet retaining ring and having end portions configured to interlock with a correspondingly configured mating portion of the collet closing sleeve.

Abstract: A collet chuck holder is described in which a standard collet is threaded into a retaining ring which is firmly fastened to the inside of a chuck body. A push tube inside the chuck is joined by bolts to a closing sleeve which surrounds the collet; these bolts pass through oversize holes in the collet retaining ring so that forces exerted by the push tube affect only the closing ring and are not transferred to the collet retaining ring. Unlike the draw bar action normally applied to collet operation, there is no axial displacement of the workpiece. This feature is useful where axial displacement would cause errors in the machining operation.