Patent ID: 6131671
Filing Date: 2000-10-17
Classification: B25D

Abstract:
A power-driven hammer operable to impart reciprocating motion to a striking tool, said power driven hammer comprisinga tool body,a cylindrical tool holder held in the tool body and having a front end for receiving the striking tool, a rear end for receiving a striking action therein and a tool axis extending between the front and rear ends, the tool holder being slidable along the tool axis relative to the tool body betweena front position, in which the tool holder can be rotated about the tool axis and relative to the tool body, anda rear position, in which the tool holder is rotationally fixed at a selected rotary angle relative to the tool body,a lock mechanism at the front end of the tool holder for selectively securing the striking tool to the tool holder,an operating member coupled to the lock mechanism and movable between a locking position for actuating the lock mechanism to secure the striking tool to the tool holder and a release position for actuating the lock mechanism to release the striking tool,means for urging the tool holder along the tool axis and toward the rear end of the tool body, andan anti-rotation member secured within the tool body, the anti-rotation memberengaging the tool holder when the tool holder is slid to the rear position by the urging means, so as to maintain the tool holder at a selected rotary angle relative to the tool body, anddisengaging from the tool holder when the tool holder is slid to the front position, to permit rotation of the tool holder relative to the tool body.