Abstract: The present invention relates to a pedal command device with variable reduction for a master-cylinder type pressure emitter. The device includes a pedal articulated on a lever that is pivotally movable about a shaft and recalled by a spring. The pedal includes at one of its ends a cam that actuates a pusher articulated on the lever, which pusher commands a pressure emitter such as a vehicle brake master cylinder by means of a thrust member and a rod.

Abstract: A control lever mechanism which operates to provide a different mechanical advantage at different points in the range of movement of a main operating control member and in dependence on the force applied to, and the force of resistance to the movement of, the main control member is disclosed. The main control lever is pivoted to a fixed fulcrum and linked to a force transmission member by a second pivot forming a fulcrum which is movable along an arcuate path closer to or further away from the fixed fulcrum. When both the fixed fulcrum and the movable fulcrum lie on the same side of the line of action of the force transmission member a component of the applied force tends to move the movable fulcrum towards the fixed fulcrum to increase the mechanical advantage of the control lever.

Abstract: According to the present disclosure a variable ratio parking brake control has a foot operated lever with a cam slot. A guide member is pivotally connected to the lever and it also has a cam slot. A clevis that is connected to a parking brake cable has a bearing pin which is slidably supported within the cam slots of the lever and the guide member. A spring is supported by the guide member and exerts a spring force urging the clevis to the outer ends of the two cam slots. The clevis is slidable from the outer ends of the cam slots to the inner ends of the slots in response to both displacement of the lever from a brake released position to a brake applied position and a load on the clevis that exceeds an amount determined by the force of the spring. The displacement of the clevis from the outer end of the cam slot of the lever to the inner end of the slot increases the mechanical advantage ratio of the brake control system.