Rigid chuck assembly
Patent 4239246 Issued on December 16, 1980. Estimated Expiration Date: 
December 22, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 22, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2676381 3100382 3253332 3415552 3434337 3456956 3792869 3850535 Method of making a tapered wedge Patent #: 3999418 InventorApplicationNo. 05/972273 filed on 12/22/1978US Classes:279/121, Wedge actuated279/123JawsExaminersPrimary: Briggs, William R.Attorney, Agent or FirmInternational ClassB23B 31/12 (20060101)AbstractA 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. | |
