Valve control for vibrator and like apparatus operating on elastic fluid

Claim 1

VIBRATOR APPARATUS, COMPRISING: MEANS INCLUDING A PRESSURE-CHARGEABLE AND DISCHARGEABLE POWER CHAMBER HAVING A HAMMER AND PISTON MEANS MOVABLE IN ONE DIRECTION UPON CHARGING OF SAID CHAMBER AND BIASED FOR RETURN MOVEMENT UPON DISCHARGE OF SAID CHAMBER; MEANS INCLUDING AN INLET CHAMBER CONNECTIBLE TO SOURCE OF ELASTIC FLUID UNDER PRESSURE; MEANS INCLUDING A CHAMBER-CONNECTING PORT, A MAIN VALVE FOR OPENING AND CLOSING THE PORT, AND A VALVE SUPPORT MOVABLY CARRYING SAID VALVE; VALVEHOLDING MEANS RELEASABLY HOLDING THE VALVE CLOSED; MEANS INCLUDING A PRESSURE-CHARGEABLE AND DISCHARGEABLE VALVE CHAMBER OPERATIVELY RELATED TO A FIRST PRESSURE AREA EXPOSED TO SAID VALVE CHAMBER FOR ACTING IN A CLOSING DIRECTION ON SAID MAIN VALVE WHEN SAID VALVE CHAMBER IS CHARGED; MEANS INCLUDING A SECOND PRESSURE AREA ACTING ON THE MAIN VALVE AND EXPOSED TO INLET CHAMBER PRESSURE AND EFFECTIVE UPON A PREDETERMINED PRESSURE DIFFERENTIAL BETWEEN THE VALVE CHAMBER AND INLET CHAMBER IN FAVOR OF SAID SECOND AREA TO OVERCOME THE HOLDING MEANS FOR OPENING SAID MAIN VALVE; AND MEANS FOR REGULATING THE OCCURRENCE OF SAID PRESSURE DIFFERENTIAL INCLUDING A PASSAGE LEADING AT ONE END OF THE VALVE CHAMBER AND ALTERNATELY CONNECTIBLE AT ITS OTHER END TO INLET CHAMBER PRESSURE WHEN THE MAIN VALVE IS OPEN AND TO A LOWER PRESSURE WHEN SAID MAIN VALVE IS CLOSED SO AS TO RESPECTIVELY CHARGE AND DISCHARGE SAID VALVE CHAMBER, A SCOENDARY VALVE IN THE PASSAGE YIELDABLE TO OPEN TO INLET CHAMBER PRESSURE WHEN THE MAIN VALVE OPENS, WHEREBY TO CHARGE SAID VALVE CHAMBER WITH INLET CHAMBER PRESSURE SO AS TO CAUSE RECLOSING OF THE MAIN VALVE, SAID SECONDARY VALVE BEING ARRANGED TO CLOSE SAID PASSAGE INCIDENT TO CHARGING SAID VALVE CHAMBER SO AS TO TRAP PRESSURE IN SAID VALVE CHAMBER AT A VALUE SUFFICIENT TO PREVENT IN SAID VALVE CHAMBER ON SAID SECOND MAIN-VALVE AREA FROM IMMEDIATELY RE-OPENING SAID MAIN VALVE, AND MEANS OPERATIVE BY THE HAMMER AND PISTON MEANS UPON PREDETERMINED RETURN MOVEMENT THEREOF TO FORCIBLY OPEN SAID SECONDARY VALVE TO RELEASE SAID TRAPPED PRESSURE FOR DISCHARGING THE VALVE CHAMBER AND THEREBY TO INCUR SAID PREDETERMINED PRESSURE DIFFERENTIAL IN FAVOR OF SAID SECOND AREA.