Safety brake system for vehicles

Claim 1

In a safety brake system for a vehicle having a door, a brake actuating member, and an ignition switch: a. a supporting frame carried by said vehicle, b. a movable frame mounted on said supporting frame and movable relative thereto to a first position when the brakes are applied and to a second position when the brakes are released, c. resilient means restraining movement of said movable frame toward said first position and disposed to move said movable frame toward said second position upon release of the brake, d. a reversible power unit mounted on said movable frame, e. a winch mounted on said movable frame and having a cable extending therefrom and operatively connected to said brake actuating member, f. means operatively connecting said power unit to said winch, g. a first electrical circuit operatively connecting said power unit to a source of power for driving said power unit and said winch connected thereto in a direction to move said brake actuating member to brake applying position whereupon said movable frame moves toward said first position, h. a door actuated switch in series with said first circuit completing said first circuit in response to opening said door, and i. a first limit switch in series with said first circuit and operable in response to movement of said movable frame to said first position to interrupt said first circuit.