Patent ID: 6058632
Filing Date: 2000-05-09
Classification: B23D,E02F,E04G,Y10S

Abstract:
Apparatus for performing work by advancing a tool against resistance thereto, comprising a tool-carrying member which is solid with the tool or at least carries the tool with no relative movement in the direction of advance of the tool;a reference member;an actuator operatively connected between the two members and adapted to apply and maintain a persistent force therebetween urging the tool-carrying member to advance relative to the reference member against said resistance;and percussion means associated with the tool-carrying member, comprising a housing positively connected to the tool-carrying member, an inertial mass movable along a reciprocating path inside the housing, and means for reciprocating the mass along the path in the housing to periodically augment the persistent force applied by the actuator to the tool-carrying member by periodic percussive impact forces applied by the reciprocating mass against one end of the path and transmitted to the tool-carrying member and thereby to assist the advance of the tool relative to the reference member against said resistance.