Fluid operated tool

Claim 1

IN A PORTABLE POWER IMPACTING TOOL HAVING A PNEUMATICALLY OPERATED ROTARY MOTOR, AN IMPROVED AIR ACTUATED AUTOMATIC TIMING MECHANISM FOR PRECISELY CONTROLLING THE OPERATION OF THE TOOL TO PRODUCE SUBSTANTIALLY THE SAME OUTPUT OF ENERGY DURING EACH REPETITIVE OPERATION OF THE TOOL, SAID TIMING MECHANISM INCLUDING MEANS DEFINING A CHAMBER WITHIN SAID TOOL, A CONDUIT MEMBER EXTENDING WITHIN SAID CHAMBER AND DEFINING A MAIN AIR PASSAGE CONNECTED TO SAID MOTOR, A MAIN CONTROL VALVE OPERABLE FOR STARTING THE FLOW OF AIR THROUGH SAID PASSAGE, A STOP VALVE ADAPTED TO STOP THE FLOW OF AIR THROUGH SAID PASSAGE AND INCLUDING A VALVE MEMBER DISPOSED WITHIN SAID CHAMBER AND SLIDABLY MOUNTED ON SAID CONDUIT MEMBER, SAID VALVE MEMBER BEING OPERABLE BETWEEN A NORMALLY OPEN POSITION WHERE AIR FLOWS THROUGH SAID PASSAGE TO SAID MOTOR AND A CLOSED POSITION WHERE THE FLOW IS STOPED, MEANS DEFINING A PASSAGEWAY CONNECTING SAID MAIN AIR PASSAGE TO SAID CHAMBER, A TIME CONTROL VALVE IN SAID PASSAGEWAY AND INCLUDING MEANS FOR CONVENIENTLY ADJUSTING THE RATE OF FLOW THERETHROUGH SO THAT AIR METERED THROUGH SAID TIME CONTROL VALVE WILL PROGRESSIVELY INCREASE THE PRESSURE IN SAID CHAMBER TO MOVE SAID VALVE MEMBER FOR CLOSING SAID STOP VALVE, AND MEANS FOR RELEASING THE PRESSURE IN SAID CHAMBER WHEN SAID MAIN CONTROL VALVE IS CLOSED.