Steering mechanisms for rollers

Claim 1

A ROAD ROLLER VEHICLE COMPRISING AT LEAST ONE PAIR OF ROLLERS, A SEPARATE AXLE FOR EACH OF SAID ROLLERS, SAID ROLLERS BEING ARRANGED IN SIDE-BY-SIDE MANNER, MOTION MEANS FOR DRIVING SAID ROLLERS INCLUDING A SEPARATE SPEED CONTROL FOR EACH OF SAID ROLLERS, A STEERING COLUMN MOUNTED FOR PIVOTAL MOVEMENT ABOUT A FIRST AXIS, A ROTATABLE HAND WHEEL CARRIED ON SAID STEERING COLUMN, FIRST AND SECOND LEVER MEANS EXTENDING OUTWARDLY FROM OPPOSITE SIDES OF SAID STEERING COLUMN AND BEING DISPLACEABLE UPON PIVOTING OF SAID STEERING COLUMN ABOUT ITS FIRST AXIS ALONG WITH SAID STEERING COLUMN, MEANS CONNECTED BETWEEN SAID HAND WHEEL AND SAID FIRST AND SECOND LEVER MEANS TO EFFECT DISPLACEMENT OF SAID FIRST AND SECOND LEVER MEANS IN OPPOSITE RELATIVE DIRECTIONS UPON ROTATION OF SAID HAND WHEELS, AND MEANS SEPARATELY CONNECTED TO SAID FIRST LEVER MEANS AND SAID SECOND LEVER MEANS FOR CONNECTING THE RESPECTIVE LEVER MEANS WITH RESPECTIVE ONES OF SAID SPEED CONTROLS FOR EACH OF SAID ROLLERS OF THE VEHICLE IN A PAIR, WHEREBY WHEN SAID STEERING COLUMN IS PIVOTED ABOUT ITS FIRST AXIS, SAID FIRST AND SECOND LEVER MEANS BEING MOVED WITH SAID COLUMN BY THE SAME AMOUNT TO EFFECT A SIMULTANEOUS UNIFORM SPEED CHANGE AND, WHEN SAID HAND-WHEEL IS ROTATED, SAID FIRST AND SECOND LEVER MEANS BEING MOVED IN OPPOSITE DIRECTIONS BY PROPORTIONAL AMOUNTS TO EFFECT SPEED CHANGE OF THE CONTROL MEANS IN OPPOSITE DIRECTIONS BY A PROPORTIONATE AMOUNT, SAID FIRST AND SECOND LEVER MEANS COMPRISING A DOUBLE-ARMED LEVER MEMBER PIVOTABLY MOUNTED ADJACENT ITS CENTER, SAID HAND-WHEEL BEING CONNECTED TO SAID DOUBLE-ARMED LEVER MEMBER TO ROTATE SAID LEVER MEMBER IN AN AMOUNT PROPORTIONAL TO ROTATION