Patent ID: 7036608
Filing Date: 2006-05-02
Classification: B25D

Abstract:
1. An apparatus for providing percussion action in a rotary power tool including a working member and a rotary output shaft defining an axis, the percussion apparatus comprising: a moveable mass movable parallel to the axis of the rotary output shaft to cause impacts to be applied to the working member of the tool; conversion means for intermittently converting rotary movement of the rotary output shaft into movement of the moveable mass; a clutch means including a first clutch member adapted to rotate with the rotary output shaft, and a second clutch member connected to the conversion means and adapted to intermittently engage the first clutch member and be rotated thereby to cause movement of the moveable mass and wherein the second clutch member is adapted to disengage from the first clutch member when the moveable mass applies an impact to the working member.