Automatic freight car brake apparatus with spring-applied fluid-

Details Automatic freight car brake apparatus with spring-applied fluid- Automatic freight car brake apparatus with spring-applied fluid-

1976-06-09

1977-07-05

Reger, Duane A.

Fluid-pressure and analogous brake systems

Multiple systems

188107, 188170, 303 63, B60T 1304

Patent

active

040336298

ABSTRACT:
The usual brake cylinder in a conventional freight car brake apparatus is replaced by a novel cylinder that embodies a pair of pistons and a spring of sufficient strength to effect a hand brake application. Conventional brake applications and releases are effected accordingly as the usual brake control valve effects the supply of fluid under pressure to and the release thereof from one of the two pistons which are connected to a common piston rod through which force is transmitted to brake applying brake shoes. The second piston is subjected on one side to the force of the spring and on the other side selectively to brake pipe pressure or pressure in a hand brake release reservoir that is charged from the brake pipe to a higher pressure by an air-driven air booster operated by air from the brake pipe. Thus, the spring is enabled to effect a hand brake application in the absence of fluid under pressure acting on the other side of the second piston. This application may be released by the supply of fluid under pressure to this other side of the second piston from either the release reservoir or the brake pipe, or some other independent source.

REFERENCES:
patent: 1061900 (1913-05-01), Clelland
patent: 1792895 (1931-02-01), Cowlishaw
patent: 2318798 (1943-05-01), Piron

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