Vehicular steering

Claim 1

VEHICLE STEERING APPARATUS FOR A SELF-PROPELLING VEHICLE HAVING MOTOR MEANS DRIVINGLY CONNECTED TO A GROUND-ENGAGING TRACTION MEANS, SAID APPARATUS COMPRISING IN COMBINATION A FRAME ASSEMBLY HAVING AT ONE END AN INVERTED U-SHAPED FRAME MEMBER SUPPORTED IN A VERTICAL POSITION, SAID FRAME MEMBER HAVING FIRST AND SECOND DEPENDING LEGS CONNECTED ONLY AT THE TOP BY A CROSS PIECE; FIRST AND SECOND GUIDE WHEELS EACH RESPECTIVELY SUPPORTED BELOW SAID FIRST AND SECOND LEGS TO REVOLVE IN A GENERALLY HORIZONTALY ARC; STEERING LINKAGE MEANS, MOVABLY SUPPORTED FROM SAID FRAME ASSEMBLY AND EXTENDING FROM SAID FIRST GUIDE WHEEL ALONG SAID FIRST LEG, SAID CROSS PIECE, AND ALONG SAID SECOND LEG TO SAID SECOND GUIDE WHEEL THEREBY LEAVING SUBSTANTIALLY UNOBSTRUCTED THE SPACE BETWEEN SAID LEGS, SAID STEERING LINKAGE MEANS INCLUDING A PIVOTED PLATE MEANS HAVING A CROSS PIECE CONNECTED TO THE LINKAGE MEANS IN THE FIRST AND SECOND LEGS OF SAID FRAME ASSEMBLY FOR REVOLVING BOTH SAID GUIDE WHEELS THROUGH RESPECTIVE HORIZONTAL ARCS TO RESPECTIVE POSITIONS TANGENTIAL TO CIRCLES HAVING RESPECTIVE RADII REPRESENTATIVE OF THE DISTANCES OF SAID GUIDE WHEELS FROM THEIR COMMON INSTANT CENTER, THEREBY TURNING SAID VEHICLE WITH A DIFFERENTIAL ACTION BETWEEN SAID GUIDE WHEELS; AND POSITIONING MEANS FOR ENGAGING SAID STEERING LINKAGE MEANS AND FOR SELECTIVELY MOVING SAID STEERING LINKAGE MEANS TO A PREDETERMINED POSITION THEREBY TURNING SAID VEHICLE.