Title: Rigid chuck assembly

Abstract: A chuck assembly for rigidly gripping an elongated workpiece, and particularly concrete reinforcing bars, is disclosed. The chuck assembly is designed for use in a machine tool, such as a thread mill, to enable threading of the ends of reinforcing bars. The chuck assembly includes jaws that are formed to engage the bar over a substantial length, preferably at least four bar diameters, and that are formed to provide a line contact engagement of the bar so as to dig into the bar ribs and provide high resistance to torsional forces. The jaw members are preferably tapered and actuated by a pair of complimentary wedge members mounted in sliding engagement with substantially the entire length of the jaw members. The chuck assembly is mounted in a two piece cast housing that is bolted together and formed with openings to permit debris to gravitate from the movable members of the assembly.

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Inventors: Howlett, James W. (Berkeley, CA, US)

Application Number: 972273
Filing Date: 1978-12-22
Publication_date: 1980-12-16
Assignee:
Primary Class(es): 279/121 279/123
Other Classes:
US Patent Ref:

2676381	Apr, 1954	Holmes	279/123.
3100382	Aug, 1963	Muller	279/121.
3253332	May, 1966	Howlett	403/305.
3415552	Dec, 1968	Howlett	403/305.
3434337	Mar, 1969	Goeke	279/121.
3456956	Jul, 1969	Herbkersman	279/121.
3792869	Feb, 1974	Braun	279/121.
3850535	Nov, 1974	Howlett	403/305.
3999418	Dec, 1976	Morell	279/123.

Other Refs: 1034307723886417248

Jul, 1978	CA
Feb, 1955	GB
Oct, 1974	SU

Primary Examiner: Briggs, William R.
Assistant Examiner:
Attorney: Warren, Chickering & Grunewald