Patent ID: 8297373

Claim:
A impact device comprising: a housing; a motor supported by the housing; a stationary shaft defining a longitudinal axis and fixed relative to the housing; a rotating transmission member drivably coupled to the motor and supported on the stationary shaft for rotation about the longitudinal axis, the rotating transmission member including a hub having a first cam surface; a rotating impact member carried by the transmission member and rotatable relative to the transmission member, the rotating impact member including at least one lug protruding from an outer periphery of the rotating impact member and a second cam surface; a spherical element engaged with the first and second cam surfaces on the hub of the rotating transmission member and the rotating impact member, respectively; an energy-absorbing member exerting a biasing force against the rotating impact member; and a reciprocating impact member oriented substantially normal to the stationary shaft and impacted by the lug of the rotating impact member.