Title: Electrical control system for pneumatic brakes

Abstract: A brake control valve apparatus is proposed for the respective cars of a train controlled from one end or the other to be braked by an analogue signal of variable mark-to-space form which operates on each car to gate bursts of train-wire carried a.c. supply which after rectification are used to regulate the brake pressure via an E.P. converter. Additionally in order to enable release of a braked car which fails to release its brake in a tunnel, a train brake release wire is provided which in one example operates in an energized-to-release mode to release a single failed brake or in another example operates in a de-energized to release mode to connect local supplies to operate dump valves on all the brake actuators of the train so providing total release in addition to the normal release by the control valve.

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Other info:

Inventors: Maskery, Arthur (London, EN)

Application Number: 548801
Filing Date: 1975-02-10
Publication_date: 1976-07-20
Assignee: Westinghouse Brake & Signal Co. Ltd. (EN)
Primary Class(es): 303/22.7 188/195, 303/3, 303/15, 303/20
Other Classes:
US Patent Ref:

3398815	Aug, 1968	Brath et al.	303/22.
3606484	Sep, 1971	Dressle, Jr.	303/20.
3606490	Sep, 1971	Ando	303/20.
3810681	May, 1974	Matty	303/20.

Other Refs:
Primary Examiner: Kunin, Stephen G.
Assistant Examiner:
Attorney: Larson, Taylor and Hinds