Two speed rotary anode x-ray tube driven by a two-phase induction motor

Claim 1

X-RAY APPARATUS COMPRISING AN X-RAY TUBE INCLUDING A TWO-PHASE SQUIRREL-CAGE-INDUCTION TUBE MOTOR OF ROTATING THE ANODE OF SAID TUBE, SAID TUBE MOTOR BEING OPERABLE AT ONE SPEED FROM A 60-CYCLE PHASE-SHIFTED SOURCE AND AT ANOTHER SPEED BY A 180-CYCLE TWO-PHASE SOURCE, A 60-CYCLE PHASE-SHIFTED SOURCE, A 180-CYCLE TWO-PHASE SOURCE INCLUDING A LOWER VOLTAGE EXTERNALLY-EXCITED THREE-PHASE ALTERNATOR AND A SCOTT-CONNECTION VOLTAGE-STEP-UP TRANSFORMER ASSEMBLAGE, AN ALTERNATOR-DRIVING MOTOR, A DIRECT CURRENT FIELD EXCITATION SOURCE, TUBE SPEED MODE SELECTOR SWITCH MEANS OPERABLE SELECTIVELY TO ESTABLISH AVAILABILITY OF SAID 60-CYCLE PHASE-SHIFTED SOURCE FOR TUBE MOTOR OPERATION OR TO EFFECT OPERATION OF SAID ALTERNATOR-DRIVING MOTOR TO RENDER SAID 180-CYCLE TWO-PHASE SOURCE AVAILABLE FOR TUBE MOTOR OPERATION, TUBE MOTOR START-STOP SWITCH MEANS OPERABLE TO EFFECT CONNECTION OF THE TUBE MOTOR TO SAID 60-CYCLE PHASE-SHIFTED SOURCE WHEN SELECTED BY SAID MODE SELECTOR SWITCH MEANS AND TO CONNECT SAID FIELD EXCITATION SOURCE TO THE ALREADY-DRIVEN ALTERNATOR TO EFFECTUATE IT FOR SUPPLY OF TWO-PHASE 180-CYCLE CURRENT TO THE TUBE MOTOR WHEN SELECTED FOR SUCH OPERATION BY THE MODE SELECTOR SWITCH MEANS, AND A SOURCE OF POWER FOR OPERATING SAID X-RAY TUBE DURING ROTATION OF ITS ANODE.