Spring-actuated parking brake for a vehicle having a...

Details Spring-actuated parking brake for a vehicle having a... Spring-actuated parking brake for a vehicle having a...

2004-05-12

2008-11-25

Burch, Melody M (Department: 3683)

Fluid-pressure and analogous brake systems

Multiple systems

Fluid pressure and electric

C303S157000, C303S158000, C188S352000

Reexamination Certificate

active

07455369

ABSTRACT:
A spring-actuated parking brake includes a spring brake actuator communicating with a fluid source via a supply line. In brake released condition, the actuator is pressurized via a supply valve; in engaged condition, the actuator communicates with a pressure sink via the supply valve and a pressure-relief line. During brake engagement, the supply valve and a shutoff valve between the supply valve and actuator are switched to flow-enabled position for pressure relief of the actuator placing it in communication with the pressure sink. For brake release, the supply valve is switched to the fluid source and the shutoff valve is switched to fluid-passing position communicating with the fluid source to pressurize the brake cylinder. After brake engagement, the shutoff valve is switched to shut-off position decoupling the actuator from the supply line; the supply valve is switched to flow-enabled position placing the supply line in communication with the pressure sink.

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