Means for depositing hard metal on another metal body by electric sparks

Claim 1

APPARATUS FOR DEPOSITING SINTERED HARD METAL FROM A TOOL FORMED IN PART OF SAID HARD METAL ONTO A WORKPIECE, COMPRISING IN COMBINATION A FIRST TRANSFORMER HAVING A PRIMARY WINDING AND A SECONDARY WINDING, THE TOOL AND WORKPIECE BEING CONNECTED TO OPPOSITE ENDS OF THE SECONDARY WINDING RESPECTIVELY, A PLURALITY OF SERIES CIRCUITS CONNECTED IN PARALLEL BETWEEN OPPOSITE ENDS OF SAID PRIMARY WINDING, EACH OF SAID SERIES CIRCUITS INCLUDING A CAPACITOR AND AN ELECTRONIC SWITCHING DEVICE, A BIASING CIRCUIT NORMALLY HOLDING SAID ELECTRONIC SWITCHING DEVICES NON-CONDUCTIVE, AN A.C. SOURCE HAVING A PLURALITY OF PHASES, A PLURALITY OF TRANSFORMERS AND ASSOCIATED FULL WAVE RECTIFIERS CONNECTING THE PHASES OF THE A.C. SOURCE TO THE PLURALITY OF CAPACITORS RESPECTIVELY TO CHARGE THE CAPACITORS IN TURN IN CYCLIC ORDER, A SWITCH-OPERATING CIRCUIT OPERABLE BY SAID A.C. SOURCE TO RENDER THE ELECTRONIC SWITCHING DEVICES CONDUCTIVE IN TURN IN CYCLIC ORDER WHEN THE ASSOCIATED CAPACITORS ARE CHARGED TO A PREDETERMINED LEVEL, EACH SWITCHING DEVICE SERVING WHEN CONDUCTIVE TO PERMIT DISCHARGE OF ITS ASSOCIATED CAPACITOR THROUGH THE PRIMARY WINDING OF THE FIRST TRANSFORMER, AND SAID SWITCH OPERATING CIRCUIT ENSURING THAT EACH CAPACITOR DISCHARGES THE SAME AMOUNT OF ENERGY THROUGH THE PRIMARY WINDING OF THE FIRST TRANSFORMER IRRESPECTIVE OF THE POSITIONS OF THE TOOL AND WORKPIECE.