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Claim 1

IN A PERCUSSIVE TOOL HAVING A CASING IN WHICH THE OCCURRENCE OF VIBRATION IS UNDERSIRABLE, A WORK SLIDABLY CARRIED BY SAID CASING FOR LIMITED AXIAL MOVEMENTS WITH RESPENT THERETO, A HAMMER AXIALLY RECIPROCABLE WITHIN SAID CASING FOR THE SUCCESSIVE INTERMITTENT DELIVERY OF IMPACT FORCE TO SAID WORK MEMBER, MEANS FOR ESTABLISHING THROUGHOUT THE CYCLE OF HAMMER RECEPROCATION A CONTINUOUS AXIAL FORCE OPERATIVE BETWEEN SAID CASING AND HAMMER TENDING TO PROPEL THE HAMMER IN THE DIRECTION TOWARD SAID WORK MEMBER AND TO CAUSE THE CASING TO RECOIL IN THE OPPOSITE DIRECTION, MEANS FOR APPLYING TO SAID HAMMER IN OPPOSITION TO SUCH CONTINUOUS FORCE A CYCLICALLY VARYING AXIAL FORCE SERVING TO ENERGIZE THE RECIPROCATORY CYCLE OF SAID HAMMER BY VARYING IN MAGNITUDE TO ALTERNATELY BECOME GREATER THAN SAID CONTINUOUS FORCE TO OVERCOME THE SAME AND PROPEL SAID HAMMER IN THE AXIAL DIRECTION AWAY FROM SAID WORK MEMBER AND LESS THAN SAID CONTINUOUS FORCE WHEREBY SAID HAMMER IS THEN PROPELLED IN THE AXIAL DIRECTION TOWARD SAID WORK MEMBER, MEANS FOR RESTRICTING SUCH CONTINUOUS FORCE TO A SUFFICIENTLY CONSTANT VALVE THROUGHOUT EACH RECIPROCATORY CYCLE OF SAID HAMMER TO SUBSTANTIALLY PREVENT THE TRANSMISSION THROUGH SUCH CONTINUOUS FORCE OF SENSIBLE VIBRATION FROM SAID HAMMER TO SAID CASING WHILE AT THE SAME TIME PERMITTING LIMITED VARIATIONS IN THE VALVE OF SUCH CONTINUOUS FORCE IN RESPONSE TO THE RECIPROCATORY DISPLACEMENTS OF SAID HAMMER, AND MEANS OPERATIVE TO CONTROL THE AFORESAID MEANS FOR APPLING SUCH CYLICALLY VARYING AXIAL FORCE TO SAID HAMMER AND BEING RESPONSIVE TO SUCH FORCE VARIATIONS FOR GOVERNING THE RECIPROCATORY CYCLE OF SAID HAMMER.