Drill chuck and tool for rotary drilling and rotary percussion drilling
Patent 4726719 Issued on February 23, 1988. Estimated Expiration Date: 
March 20, 2006. 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 20, 2006. 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 ReferencesTool shaft for a tool of the percussive and rotative type Drill chuck for percussion drilling Autolocking hammer-drill chuck Patent #: 4586859 InventorAssigneeApplicationNo. 06/841556 filed on 03/20/1986US Classes:408/240, Clamping jaws279/123, Jaws279/19.4, Spreading elements279/64Threaded sleeve and bodyExaminersPrimary: Bilinsky, Z. R.Attorney, Agent or FirmInternational ClassesB23B 31/00 (20060101)B23B 31/12 (20060101) B25D 17/00 (20060101) B25D 17/08 (20060101) Foreign Application Priority Data1985-03-20 DEAbstractA drilling device includes a drill chuck which is provided with at least two adjustable clamping jaws slightly rotatably guided in the drill chuck and including a guide surface for a tool shank of a tool. The guide surface is provided with at least one projection extending in direction of the chuck axis and engaging into a recess of the tool shank for rotating and axially limiting the play of the tool. The projection of each jaw is arranged circumferentially rearwardly offset to the mid-plane of each clamping jaw so that the guide surface is defined by a leading part which is wider than a trailing part in circumferential direction of the tool shank. | |
