Automobile tow bar

Claim 1

A TOW BAR COMPRISING, A FRONT TOWING YOKE HAVING SPACED UPPER AND LOWER PLATES JOINED TOGETHER AT THE FRONT AND DEFINING AN UPRIGHT DRAFT PIN HOLE IN THEIR JOINED PORTIONS, LATERALLY SPACED PAIRS OF PIVOT PIN HOLES IN THE REAR ENDS OF SAID PLATES HAVING PIVOT PINS REMOVEABLY POSITIONED THEREIN, A PAIR OF COACTING CAM PLATES ROTATABLY MOUNTED BETWEEN SAID YOKE PLATES AND AROUND SAID PIVOT PINS, A NOSE PROJECTING FROM ONE OF SAID CAM PLATES, A NOTCH FORMED IN THE OTHER OF SAID CAM PLATES RECEIVING SAID NOSE WITH THE EDGE OF THE NOTCH ROLLINGLY ENGAGING THE EDGE OF THE NOSE, CONNECTING PORTIONS ON SAID CAM PLATES PROJECTING FROM SAID YOKE PLATES AT EQUI-ANGULARLY SPACED POSITIONS ON OPPOSITE SIDES OF A LONGITUDINAL PLANE PASSED BETWEEN SAID PIVOT PINS AND THROUGH SAID DRAFT PIN HOLE, A PAIR OF TUBULAR TOWING ARMS SECURED TO SAID CONNECTING PORTIONS OF SAID CAM PLATES, A YOKE SECURED TO ONE OF SAID ARMS AND HAVING A TIE BAR PIVOTED THEREIN, A SECOND YOKE SECURED TO THE OTHER OF SAID ARMS, A COUPLING TUBE PIVOTED IN ONE SIDE OF SAID SECOND YOKE AND BEARING AGAINST THE OTHER SIDE TRANSVERSE TO SAID OTHER ARM AND HAVING A SLEEVE ON ONE END SLIDABLY RECEIVING SAID TIE BAR, A CLAMP SCREW THREADEDLY ENGAGED THROUGH SAID COUPLING TUBE AND CLAMPINGLY ENGAGED WITH SAID TIE BAR, A LOCK NUT ON SAID SCREW ENGAGEABLE WITH SAID SECOND YOKE, AND COUPLING MEANS ON THE REAR ENDS OF SAID ARMS ATTACHABLE TO A BUMPER.