Motor powered air hammer

Claim 1

A MOTOR POWERED PNEUMATIV IMPACT TOOL COMPRISING A MAIN SLIDE BARREL HAVING ANVIL GHIDE HOUSING STRUCTURE AT ONE END, AN ANVIL SHAFT CARRIED IN SAID ANVIL GUIDE HOUSING STRUCTURE AND PROJECTING THERETHROUGH, A HAMMER SHAFT RECIPROCABLY SLIDABLE THROUGH SAID BARREL TO APPLY ENDWISE IMPACTS TO SAID ANVIL SHAFT, MEANS DEFINING A COMPRESSION CHAMBER WITHIN SAID BARREL AND INCLUDING A PISTON FIXEDLY MOUNTED ON SAID HAMMER SHAFT TO OPERATE IN SEALING SLIDABLE RELATION IN SAID BARREL AND MEANS COMPLETING AN AIR SEAL AT THE OTHER END OF THE BARREL, MEANS FOR SUPPLYING AIR TO SAID COMPRESSION CHAMBER TO MAINTAIN A PREDETERMINED MINIMUM PRESSURE THEREIN, A MOTOR MOUNTED IN FIXED RELATION TO SAID BARREL, AND MECHANICAL MEANS CONNECTING SAID MOTOR AND OPERABLE REPEATEDLY FIRST TO SHIFT SAID HAMMER SHAFT TO MOVE SAID PISTON TOWARDS SAID OTHER END OF THE BARREL FOR MULTIPLYING PRESSURE IN SAID COMPRESSION CHAMBER AND THEREAFTER TO RELEASE SAID HAMMER SHAFT TO ENABLE EXPANSION OF SAID CHAMBER TO DRIVE THE HAMMER SHAFT AGAINST THE ANVIL SHAFT, SAID MEANS FOR SUPPLYING AIR COMPRISING AN AIR ACCUMULATOR FOR STORING AIR AT A PREDETERMINED PRESSURE LEVEL ABOVE ATMOSPHERIC PRESSURE, ADJUSTABLE PRESSURE REDUCING MEANS INTERCONNECTED BETWEEN SAID AIR ACCUMULATOR AND SAID COMPRESSION CHAMBER FOR SUPPLYING AIR TO SAID COMPRESSION CHAMBER AT A SELECTED PRESSURE LEVEL BELOW SAID PREDETERMINED AIR ACCUMULATOR PRESSURE LEVEL, AND A ONE WAY VALVE INTERCONNECTED BETWEEN SAID ADJUSTABLE MEANS AND SAID COMPRESSION CHAMBER TO PERMIT FLOW OF AIR INTO SAID COMPRESSION CHAMBER WHILE PREVENTING INCREASED PRESSURE IN SAID COMPRESSION CHAMBER DURING COMPRESSION FROM INFLUENCING SAID ADJUSTABLE MEANS.