초록 ▼

A fail-safe brake for a vehicle and including friction-type brake members and hydraulic pressure-type piston members operable on the brake members. Springs are also operable on the brake members for positioning and holding the brake members in braking relationship when the hydraulic pressure is abse

A fail-safe brake for a vehicle and including friction-type brake members and hydraulic pressure-type piston members operable on the brake members. Springs are also operable on the brake members for positioning and holding the brake members in braking relationship when the hydraulic pressure is absent. Also, hydraulic pressure can be utilized for overcoming the springs and releasing the brake members. The system includes hydraulic pumps and valves for controlling flow to and from the brake unit itself. A piston pilot member and a piston guide cylinder both guide the pistons.

대표청구항 ▼

A fail-safe brake for a vehicle having an actuator means and friction-type brake members operative to effect brake action in response to said actuator means applying a force thereon, said actuator means comprising a shaft pilot member, a projection coaxially on said pilot member, a piston member flu

A fail-safe brake for a vehicle having an actuator means and friction-type brake members operative to effect brake action in response to said actuator means applying a force thereon, said actuator means comprising a shaft pilot member, a projection coaxially on said pilot member, a piston member fluid-tightly slidable coaxially about said pilot member for movement toward and away from said projection, a cylindrical member affixed to said piston member and extending therefrom and in fluid-tight sliding relation over said projection and defining a fluid-retaining pocket with said projection and said piston member and being operatively associated with said brake members for forcing said brake members into braking action in response to movement of said piston member toward said projection, a fluid pressure pump and passageway in fluid-flow communication with said pocket for fluid pressurizing said piston member in the direction away from said projection to thereby relieve the braking force on said brake members, spring means operatively associated with said piston member for yieldingly moving said piston member toward said projection when the fluid pressure in said pocket is only a minimum pressure and to thereby effect a fail-safe brake action on said brake members, and an additional member being coaxially slidable on said pilot member and operatively associated with said brake members for effecting brake action in response to selective actuation of said additional member independent of movement of said piston member.