Dead length collet chuck holder

• US 5,480,164 A
• Filed: 11/23/1994
• Issued: 01/02/1996
• Est. Priority Date: 11/23/1994
• Status: Expired due to Fees

• Current Assignee: William G. Murphy
• Original Assignee: William G. Murphy
• Inventors: Murphy, William G.
• Primary Examiner(s): Bishop, Steven C.
• Application Number:
  US08/344,142
• Time in Patent Office: 405 Days
• Field of Search: 279/4.07, 279/4.09, 279/47, 279/48, 279/50, 279/43, 279/51, 279/57, 279/146, 279/110, 82/142, 82/147
• US Class Current: 279/50
• CPC Class Codes: B23B 31/2072 Axially moving cam, fixed jaws
• CPC Class Codes: Y10T 279/17521 Reciprocating cam 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.

Claims

1. An improved dead length collet chuck holder for preventing edgewise movement of collet jaws while closing containing a collet threaded at one end, a collet retaining ring, a closing sleeve surrounding the collet, a push tube for applying closing pressure to the collet jaws without axial movement of the jaws and an actuator for coupling said push tube to the closing sleeve, the improvement comprising, in part, a series of bolts arranged around a drilled bolt circle in said collet retaining ring with a corresponding series of tapped holes in the interior of the chuck holder whereby the collet is firmly anchored at its threaded end to the collet retaining ring which is then bolted to the chuck body so that the possibility of axial movement of the collet jaws and any workpiece therein is minimized.

2. An improved dead length collet chuck holder as described in claim 1 in which another part of the improvement is comprised of a hollow cylinder threaded at both ends to firmly couple the push tube to said closing sleeve through said actuator thereby further increasing the rigidity of the assembly.

3. An improved dead length collet chuck holder as described in claim 1 in which the collet is prevented from turning during opening and closing of the jaws by a set screw mounted in the body of the holder, said set screw contacting and being slidable in a slot machined in the collet whereby jaw operation is made even more repeatable and precise.