Drill chuck for percussion drilling
Patent 4536109 Issued on August 20, 1985. Estimated Expiration Date: 
March 7, 2004. 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 7, 2004. 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 3737170 Tool holder for hammer drills Patent #: 4491445 InventorsAssigneeApplicationNo. 06/587190 filed on 03/07/1984US Classes:408/240, Clamping jaws279/60Obliquely guided reciprocating jawsExaminersPrimary: Desmond, Eugene F.Attorney, Agent or FirmInternational ClassesB23B 31/12 (20060101)B25D 17/00 (20060101) B25D 17/08 (20060101) Foreign Application Priority Data1983-03-21 DEAbstractA drill chuck usable in a drilling device capable of rotary or rotary-percussion drilling, includes radially adjustable clamping jaws with the clamping surfaces of the jaws directed inwardly towards the central axis of the chuck. Each clamping jaw has at least one projection extending radially inwardly from the clamping surface for engagement in correspondingly shaped recesses in the shank of a drilling tool insertable into the chuck. The clamping surfaces form guide surfaces for the drilling tool so that the drilling tool is adequately guided over large surfaces extending in the axial and circumferential directions in the chuck. | |
