Wear-resistant chuck for driving hard-shank bits
Patent 5340128 Issued on August 23, 1994. Estimated Expiration Date: 
March 18, 2013. 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.
March 18, 2013. 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 150983 914255 1898264 2346706 Arrangement for torque transmitting, and tool cooperating therewith Method of applying non-slip coating to tools and resulting product Self-clamping or self-tightening chuck Patent #: 4902025 InventorsAssigneeApplicationNo. 033126 filed on 03/18/1993US Classes:279/60, Obliquely guided reciprocating jaws279/43.6, With jaw pads or insert279/46.6, With jaw pads or insert279/123JawsExaminersPrimary: Bishop, Steven C.Attorney, Agent or FirmForeign Patent References
International ClassB23B 031/12Foreign Application Priority Data1992-03-21 DEAbstractA chuck for driving drill bits an the like having shafts of hardened steel is provided with clamping jaws which at least at their clamping surfaces have a coating of diamond dust, so that they will have a resistance to abrasion that is greater than that of hardened steel. The diamond dust can embed itself in the clamping jaws. The entire chuck jaw may be made with a material having that property or one or more clamping parts of the jaw may be made of such a material, or the coating may be provided on a part of the chuck jaw or on the clamping parts.Other References
Field of SearchObliquely guided reciprocating jawsThreaded sleeve and jaw Conical sleeve Threaded central cone and jaw Threaded sleeve and body Reciprocating jaw advancing sleeve Radially reciprocating jaws MISCELLANEOUS KEYLESS TYPE SOCKET Jaws Fixed cam and moving jaws Threaded-sleeve actuator Axial screw actuator Fixed cam and moving jaws Threaded sleeve and body With jaw pads or insert With jaw pads or insert With tool-retaining means Clamping jaws Named material Nonmetallic Specific material(s) used for holder | |
