Wheeled vehicle steering device

Claim 1

IN A WHEELED VEHICLE STEERING DEVICE HAVING THREE SPACED VEHICLE SUPPORTING WHEEL UNITS, EACH OF SAID WHEEL UNITS SUPPORTING A SUBSTANTIAL PORTION OF THE WEIGHT OF SAID VEHICLE; TWO OF SAID WHEEL UNITS BEING SPACED APART LATERALLY OF THE VEHICLE IN A PLANE SUBSTANTIALLY NORMAL TO THE DIRECTION OF TRAVEL OF THE VEHICLE AND BOTH OF SAID WHEEL UNITS POSITIONED IN THE FORWARD PORTION OF THE VEHICLE RELATIVE TO ITS DIRECTION OF TRAVEL; AND THE THIRD OF SAID WHEEL UNITS BEING POSITIONED REARWARD OF AND BETWEEN SAID TWO FORWARD-POSITIONED WHEEL UNITS; SUPPORTS FORMING UPRIGHT STEERING AXES, ONE ADJACENT EACH OF SAID WHEEL UNITS; MEANS TO PROPEL SAID VEHICLE COMPRISING A DRIVE CONNECTION FOR ROTATING SAID REARWARD-POSITIONED WHEEL UNIT; A STEERING LINKAGE CONNECTING SAID REARWARD-POSITIONED WHEEL UNIT AND ONE OF SAID FORWARD-POSITIONED WHEEL UNITS FOR OPPOSITE STEERING MOVEMENT ABOUT THEIR RESPECTIVE UPRIGHT STEERING AXES; A STEERING MEMBER FOR ACTUATING SAID LINKAGE; AND AN OFFSET SUPPORT BRACKET POSITIONING SAID OTHER FORWARD-POSITIONED WHEEL UNIT FOR FREE CASTERING STEERING MOVEMENT ABOUT ITS UPRIGHT STEERING AXIS WITH CASTERING FREEDOM INDEPENDENT OF SAID LINKAGE CONNECTED WHEEL UNITS; SAID INDEPENDENT CASTERING FREEDOM OF SAID OTHER FORWARD-POSITIONED WHEEL UNIT AFFORDING AN ABILITY OF SHORT TURN FOR SAID VEHICLE WHEN DESIRED AS CONTROLLED BY SAID STEERING MEMBER.