Fluid operated percussion drill or hydraulic hammer

Claim 1

IN A PRESSURE FLUID OPERATED HAMMER FOR USE IN THE DRILLING OF WELLS, A TUBULAR CASING, MEANS FOR CONNECTING THE CASING INTO A STRING OF DRILL PIPE FOR ROTATION WITH THE STRING IN A WELL BORE AND THROUGH WHICH FLUID MAY FLOW THROUGH THE CASING, MEANS FORMING AN UPPER AND A LOWER ANVIL IN THE CASING, A TUBULAR HAMMER MOVABLY DISPOSED IN THE CASING FOR LONGITUDINAL MOVEMENT INTO AND OUT OF ENGAGEMENT WITH THE ANVILS, MEANS ON THE CASING EXTENDING INTO AND SLIDABLY ENGAGABLE WITH THE HAMMER IN POSITION TO FORM THEREWITH A CHAMBER IN THE HAMMER WHOSE OPPOSITE ENDS ARE CLOSED, UPPER AND LOWER PORTS IN THE HAMMER THROUGH WHICH FLUID MAY FLOW INTO AND OUT OF SAID CHAMBER, MEANS IN SAID HAMMER POSITIONED FOR COACTION WITH SAID PORTS TO PREVENT THE INFLOW OF FLUID TO AND ALLOW THE OUTFLOW OF FLUID FROM SAID CHAMBER THROUGH SAID UPPER PORTS AN TO PREVENT THE OUTFLOW OF FLUID FROM AND ALLOW THE INFLOW OF FLUID TO SAID CHAMBER THROUGH SAID LOWER PORTS UPON DOWNWARD MOVEMENT OF THE HAMMER TO CAUSE THE HAMMER TO MOVE UPWARDLY AND TO PREVENT INFLOW OF FLUID TO AND ALLOW OUTFLOW OF FLUID FROM THE CHAMBER THROUGH SAID LOWER PORTS AND PREVENT OUTFLOW OF FLUID FROM AND ALLOW INFLOW OF FLUID TO SAID CHAMBER UPON UPWARD MOVEMENT OF THE HAMMER TO CAUSE THE HAMMER TO MOVE DOWNWARDLY.