Steering torque amplifier

Claim 1

IN A TORQUE AMPLIFIER, (A) A HOUSING HAVING (B) A VALVE CHAMBER THEREIN, (C) A ROTARY VALVE ROTATABLY MOUNTED WITHIN SAID VALVE CHAMBER, AND INCLUDING (D) AN INPUT PART, (E) AN OUTPUT PART COAXIAL WITH AND RELATIVELY MOVABLE WITH RESPECT TO SAID INPUT PART, (F) A ROTARY FLUID OPERATED MOTOR WITHIN SAID HOUSING AND INCLUDING (G) A ROTOR HAVING DRIVE CONNECTION WITH SAID OUTPUT PART, (H) FLUID PRESSURE AND RETURN CONNECTIONS LEADING INTO SAID HOUSING AND VALVE CHAMBER, (I) FLUID PRESSURE PASSAGEWAYS IN SAID HOUSING LEADING FROM SAID VALVE CHAMBER TO SAID MOTOR FOR SUPPLYING FLUID UNDER PRESSURE TO SAID MOTOR UPON OPERATION OF SAID VALVE, (J) MEANS TURNING SAID INPUT PART RELATIVE TO SAID OUTPUT PART TO EFFECT THE SUPPLY AND RELEASE OF FLUID UNDER PRESSURE TO SAID MOTOR TO EFFECT TURNING MOVEMENT OF SAID OUTPUT PART BY POWER, (K) A PIN MOUNTED IN SAID INPUT PART AND EXTENDING RADIALLY THEREFROM, (L) A SLOT IN SAID OUTPUT PART RECEIVING SAID PIN AND CIRCUMFERENTIALLY ENLARGED TO ACCOMMODATE MOVEMENT OF SAID PIN WITH RESPECT TO SAID SLOT, AND LIMITING RELATIVE MOVEMENT BETWEEN SAID INPUT AND SAID OUTPUT PARTS AND FORMING A POSITIVE DRIVE CONNECTION BETWEEN SAID INPUT AND SAID OUTPUT PARTS, (M) AND A TORSION SPRING EXTENDING ALONG THE OUTSIDE OF SAID INPUT PART AND CONNECTED THERETO AT ONE END AND CONNECTED TO SAID OUTPUT PART AT ITS OPPOSITE END TO IMPART A FEEL OF STEERING.