Patent ID: 7363713

Claim:
A reciprocating power tool comprising: a motor, a tool bit that performs a predetermined operation by reciprocating, a slider that reciprocates to drive the tool bit, a motion converting mechanism including a crank mechanism that converts a rotating output of die motor into a reciprocating movement of the slider, a counter weight provided in the motion converting mechanism, the counter weight reciprocating in a direction opposite to the reciprocating direction of the slider, wherein the phase difference between the reciprocating movement of the slider and the reciprocating movement of the counter weight is set such that a time lag is provided between the instant when the slider reaches a top dead center and the instant when the counter weight reaches a bottom dead center, and a bevel gear provided in the motion converting mechanism, the bevel gear rotating about an axis perpendicular to a first plane, the counterweight reciprocating in a second plane substantially parallel to the first plane.