Vibrationless air hammer assembly

Claim 1

A PAVEMENT BREAKER COMPRISING A PERCUSSION TOOL BIT AND AN AIR MOTOR MOUNTED ON SAID BIT AND HAVING AN ELONGATED BORE THEREIN, A RIGID MUFFLER CASING FULLY ENCLOSING SAID MOTOR AT THE TOP OF SAID MOTOR AND OVER SUBSTANTIALLY ALL OF THE SIDE AREA OF SAID MOTOR WITH SAID MUFFLER CASING AND SAID TOOL BIT COOPERATIVELY ENCLOSING SAID AIR MOTOR AT THE BOTTOM OF SAID AIR MOTOR, A PISTON RECIPROCABLE IN SAID BORE IN AXIAL ALIGNMENT WITH SAID BIT FOR DELIVERING BLOWS TO SAID BIT UPPER AND LOWER PORTS IN SAID BORE, AN AIR SUPPLY PASSAGEWAY IN SAID MOTOR HAVING A SELECTIVELY OPERABLE VALVE THEREIN, AN ALTERNATOR VALVE IN SAID MOTOR FOR CONNECTING SAID AIR SUPPLY PASSAGEWAY ALTERNATELY TO SAID UPPER AND LOWER PORTS TO RECIPROCATE SAID PISTON WHEN SAID SELECTIVELY OPERABLE VALVE IS OPEN, VALVE ACTUATING MEANS CONNECTED TO SAID SELECTIVELY OPERABLE VALVE AND MOVABLE BETWEEN ON AND OFF POSITIONS TO MAINTAIN SAID SELECTIVELY OPERABLE VALVE OPENED AND CLOSED RESPECTIVELY, AN AIR EXHAUST PORT LEADING FROM SAID AIR MOTOR INTO SAID CASING, AND AN AIR DISCHARGE PORT LEADING FROM SAID CASING AT A POSITION REMOTE FROM SAID EXHAUST PORT.