Electrolytic grinding machine

Claim 1

APPARATUS FOR REMOVING METAL BY AN ELECTROLYTIC PROCESS, THE COMBINATION COMPRISING: AN ELECTRIC MOTOR INCLUDING AN INTERMEDIATE HOUSING SECTION HAVING A STATOR MOUNTED THEREIN; A ROTOR MOUNTED WITHIN SAID STATOR; A SOLID SPINDLE CONNECTED TO SAID ROTOR AND EXTENDING BEYOND THE ENDS THEREOF AND BEYOND THE ENDS OF SAID INTERMEDIATE HOUSING SECTION; A FIRST HOUSING END SECTION HAVING A BEARING MOUNTED THEREIN, FIRST INSULATION MEANS BETWEEN SAID FIRST HOUSING END SECTION AND SAID INTERMEDIATE HOUSING SECTION, SAID FIRST END SECTION BEING FIXED TO BUT ELECTRICALLY INSULATED FROM SAID INTERMEDIATE SECTION, SAID SPINDLE BEING ROTATABLY SUPPORTED ADJACENT ONE END THEREOF BY SAID BEARING AND EXTENDING THROUGH AND BEYOND SAID FIRST END SECTION; A SECOND HOUSING END SECTION HAVING A SECOND BEARING MOUNTED THEREIN, SECOND ISULATIN MEANS BETWEEN SAID SECOND HOUSING END SECTION AND SAID INTERMEDIATE HOUSING SECTION, THIRD INSULATION MEANS BETWEEN SAID SECOND HOUSING END SECTION AND SAID SECOND BEARING, SAID SECOND END SECTION BEING FIXED TO BUT ELECTRICALLY INSULATED FROM SAID INTERMEDIATE SECTION, SAID SPINDLE BEING ROTATABLY SUPPORTED ADJACENT ITS OTHER END BY SAID SECOND BEARING AND EXTENDING THROUGH AND BEYOND SAID SECOND END SECTION; AN ELECTRICALLY CONDUCTIVE SLIP RING WITHIN SAID SECOND END SECTION AND SECURED TO SAID SPINDLE BETWEEN SAID SECOND BEARING AND THE ADJACENT END OF SAID STATOR, SAID SLIP RING BEING ELECTRICALLY CONNECTED TO SAID SPINDLE BUT BEING FREE OF ELECTRICAL CONNECTION TO THE WINDINGS OF SAID MOTOR; A BRUSH MOUNTED IN SAID SECOND END SECTION AND MEANS URGING SAME INTO SLIDING CONTACT WITH SAID SLIP RING; A SOURCE OF D.C. POTENTIAL AND MEANS CONNECTING ONE TERMINAL OF SAME TO SAID BRUSH, THE OTHER TERMINAL THEREOF BEING ADAPTED FOR CONNECTION TO THE WORKPIECES TO BE GROUND, SAID SECOND BEARING BEING INSULATED FROM FLOW OF ELECTRICAL ENERGY THERETHROUGH BY SAID THIRD INSULATION MEANS; AND MEANS FOR SECURING ELECTROLYTIC GRINDING WHEELS TO THE RESPECTIVE ENDS OF SAID SPINDLE WITH AT LEAST ONE GRINDING WHEEL ON SAID SPINDLE.