Brake assurance circuit to preserve proper locomotive operting s

Details Brake assurance circuit to preserve proper locomotive operting s Brake assurance circuit to preserve proper locomotive operting s

1988-03-25

1989-05-16

Kashnikow, Andres

Fluid-pressure and analogous brake systems

Exterior control

303 15, 303 67, 303101, 188156, B60T 1514, B60T 710, B60T 712

Patent

active

048304379

ABSTRACT:
A brake assurance circuit via which a magnet valve device is deenergized to exhaust brake pipe pressure independently of the locomotive brake valve device in order to apply braking any time the proper operating status of the locomotive brake valve is changed after the locomotive is underway. A pressure switch responsive to the cut-in and cut-out setting of the manual selector valve associated with the brake valve senses the locomotive status and connects one of two possible circuits to the magnet valve device in parallel with a primary circuit having a speed responsive switch. Once locomotive movement is underway, the primary circuit drops out and the effective circuits selected by the pressure switch maintains the magnet valve energized provided the selected pressure switch setting is not changed. Should the pressure switch setting be changed, all power is cut off from the magnet valve and cannot be reapplied until the locomotive comes to a complete halt to allow the speed responsive switch to reset and restore power via the primary circuit.

REFERENCES:
patent: 2068340 (1937-01-01), Logan, Jr.
patent: 2860928 (1958-11-01), Gorman
patent: 3893698 (1975-07-01), Fontaine
patent: 3901558 (1975-08-01), Burckett
patent: 4165136 (1979-08-01), Erlbeck
patent: 4491372 (1985-01-01), Walley
patent: 4626039 (1986-12-01), Worbois
Wabco "26-L", Locomotive Air Brake, Equipment and Devices; Westinghouse Air Brake Division, American Standard Inc., Jan. 1988.

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