Clutch and brake controls for inching vehicle

Claim 1

FOR USE WITH A VEHICLE HAVING FLUID ACTUATED BRAKES AND A DRIVE TRAIN INCLUDING A CLUTCH, AN INCHING AND BRAKING SYSTEM COMPRISING A VALVE WITH AN ELONGATED BODY, A LONGITUDINALLY EXTENDING BORE IN THE SAID BODY, A FIRST PISTON SLIDABLY DISPOSED IN THE SAID BORE FOR LONGITUDINAL MOVEMENT AND DEFINING WITH THE SAID FIRST AND SECOND LONGITUDINALLY SPACED APART CHAMBERS, FIRST AND SECOND PORTS COMMUNICATING WITH THE SAID FIRST CHAMBER, THIRD AND FOURTH PORTS COMMUNICATING WITH THE SAID SECOND CHAMBER, SPRING MEANS FOR BIASING THE SAID FIRST PISTON TOWARD THE SAID FIRST CHAMBER, A SECOND BORE EXTENDING LONGITUDINALLY THROUGH THE SAID FIRST PISTON, A SECOND PISTON SLIDABLY DISPOSED IN THE SAID SECOND BORE AND ACTUATABLE LONGITUDINALLY TO A POSITION BLOCKING COMMUNICATION OF THE SAID THIRD PORT WITH THE SAID SECOND CHAMBER, AND SPRING MEANS FOR BIASING THE SAID SECOND PISTON TOWARD THE SAID FIRST CHAMBER SO THAT WHEN PRESSURIZED FLUID IS SUPPLIED TO THE SAID FIRST CHAMBER THE SAID SECOND PISTON