Apparatus for producing pressure waves

Claim 1

APPARATUS FOR PRODUCING SHOCK PRESSURE WAVES, COMPRISING SINGLE-PHASE ALTERNATING POWER SOURCE MEANS, CAPACITOR MEANS, RECTIFIER MEANS CONNECTING SAID CAPACITOR MEANS AND SAID SOURCE MEANS FOR CHARGING SAID CAPACITOR MEANS, A MECHANICAL PRESSURE PRODUCING DEVICE HAVING AN INDUCTANCE WINDING ADAPTED TO RECEIVE THEREIN A WORKPIECE TO BE SUBJECTED TO SHOCK PRESSURE DUE TO THE MAGNETIC FIELD OF SAID WINDING, SWITCH MEANS INTERMEDIATE SAID CAPACITOR MEANS AND SAID PRESSURE PRODUCING DEVICE FOR INTERMITTENTLY CONNECTING SAID CAPACITOR MEANS TO SAID WINDING FOR CAUSING IT TO PRODUCE SAID FIELD, AND CONTROL MEANS CONNECTED TO SAID SWITCH MEANS RESPONSIVE TO THE VOLTAGE OF SAID SOURCE MEANS FOR CLOSING SAID SWITCH MEANS ONLY AT GIVEN ZERO PASSAGES OF ALTERNATING VOLTAGE AT SAID SOURCE MEANS, SAID CAPACITOR MEANS INCLUDING A PAIR OF CAPACITORS IN VOLTAGE DOUBLER CONNECTION, SAID SWITCH MEANS BEING CONTROLLABLE ELEACTRONIC RECTIFIER, AND SAID CONTROL MEANS INCLUDING A PHASE SHIFT NETWORK AND A PHASE NETWORK FOR IGNITING SAID RECTIFIER.