PARKING BRAKE ASSEMBLY FOR RAILWAY VEHICLE BRAKE SYSTEM

摘要

A parking brake assembly for a railway car includes a ratchet mounted for rotation on a threaded piston rod of a brake actuator and a holding pawl en gageable with the ratchet for maintaining a push rod of the parking brake as sembly to apply braking force when the air pressure is lost in the brake pip e and releasing the push rod to accordingly release the braking force when t he supply of air pressure in the brake pipe is restored. An operating lever and a cylinder connected thereto are provided for selectively rotating the h olding pawl. Valve is provided for supplying air pressure to and evacuating it from the cylinder. Release mechanism is provided for manually releasing t he braking force. The parking brake assembly is employed with either truck-m ounted or carbody-mounted braking system.