Patent ID: 6378668
Filing Date: 2002-04-30
Classification: B60T,B61H

Abstract:
A spring applied parking brake assembly for a railroad vehicle braking system, such railroad vehicle braking system including a force transfer lever associated with at least one force transmitting member for initiating a brake application, said spring applied parking brake assembly comprising:(a) a housing including a means for one of applying and removing pneumatic pressure therein; (b) a piston assembly mounted for longitudinal movement within said housing, said piston assembly capable of longitudinal movement upon one of an application and removal of pneumatic pressure to a first side of said piston assembly, said piston assembly including a piston and a piston rod; (c) an extension means associated with an end of such force transfer lever; (d) attachment means disposed on said piston rod for associating said piston assembly with said extension means so as to apply a force to said extension means and consequently to such force transfer lever upon longitudinal movement of said piston assembly; and (e) at least one spring member caged between an inside end surface of said housing and a facing surface of said piston, said spring member being capable of applying a force to a second side of said piston assembly to achieve longitudinal movement of said piston assembly upon removal of pneumatic pressure to said piston assembly to cause said piston assembly to retract within said housing and cause such force transfer lever to rotate in a direction to initiate a brake application in such railroad vehicle braking system.