Patent ID: 8113296
Filing Date: 2012-02-14
Classification: B21J,Y10T

Abstract:
1. In an impact tool comprising an elongate shank extending in a longitudinal direction between a working end arranged to engage a workpiece and a mounting end opposite the working end, and a tool head arranged for supporting the mounting end of the shank, the tool head being arranged to drive the shank in the longitudinal direction for impacting the workpiece, an improvement comprising an anti-rotation device for resisting relative rotation between the shank and the tool head, the anti-rotation device comprising: a first anchor portion arranged to grip the shank between the mounting end and the working end of the shank such that relative rotation between the first anchor portion and the shank is resisted; a second anchor portion arranged to grip the tool head such that relative rotation between the second anchor portion and the tool head is resisted; and an intermediate portion coupling the first and second anchor portions such that relative rotation between the first and second anchor portions is resisted; wherein the intermediate portion is sufficiently resilient that longitudinal impacting motion of the shank relative to the tool head is substantially unrestricted while the first anchor portion non-rotatably grips the shank and the second anchor portion non-rotatably grips the tool head.