Patent ID: 6679143
Filing Date: 2004-01-20
Classification: B23D,B25B,B26D

Abstract:
A manually operated rotatable impact tool comprising;a driven member having means for retaining and driving a fastener about an axis, the driven member further having at least one impact stop offset from the axis; a driving member rotatably connected to the driven member for driving the driven member about the axis to loosen or tighten the fastener; an impact mass movable along a path in communication with the impact stop; energy storing means for storing energy upon rotation of the driving member; and energy releasing means for releasing the stored energy and allowing it to be at least partially transferred to the impact mass such that the impact mass accelerates and strikes the impact star upon the release of the stored energy; wherein the energy storing and releasing means comprises a spring for biasing the impact mass away from an abutment on the driving member; a movable stop plate biased into the path and movable out from the path; and a stop mover rotating with the driving member for engaging and moving the movable stop plate from the path upon a predetermined angular rotation of the driving member; and wherein rotation of the driving member forces the impact mass to abut the movable stop plate and compress the spring until the stop mover moves the movable stop plate from the path when the driving member is rotated the predetermined angular rotation thereby releasing the impact mass to accelerate and strike the impact stop.