Fluidically operated railway switch machine

Details Fluidically operated railway switch machine Fluidically operated railway switch machine

1978-02-01

1980-07-22

Blix, Trygve M.

Railway switches and signals

Fluid-motor actuation

Electric control

246258, 246284, 246448, B61L 1106

Patent

active

042135885

ABSTRACT:
A railway switch machine including a first fluid operated actuator for switching the movable points of the rails between two extreme positions for establishing respective routes of travel for railway vehicles, valve device coupled to the first fluid operated actuator to selectively open or to close a passageway coupled to opposite sides of a pressure differential responsive movable member of the first fluid operated actuator whereby when the valve device closes passageways wherein a fluid pressure differential may be established across the movable member to operate said first fluid operated actuator to thereby switch the movable points of the rails and when the first valve device opens the passageway, fluid may be directly exchanged between either side of the movable member such as to permit the movable points of the rails to be moved from one extreme position to the other extreme position by the passage of a railway vehicle trailing the movable points of the rails, a locking device and a second fluid operated actuator for locking the movable points of the rails in either of the two extreme positions, and a resiliently-loaded latching device for releasably latching the movable points of the rails in either of the two extreme positions.

REFERENCES:
patent: 1708245 (1929-04-01), Van Buskirk
patent: 1789108 (1931-01-01), Meadows
patent: 2098831 (1937-11-01), McGowan
patent: 2812426 (1957-11-01), Brown
patent: 3015464 (1962-01-01), Bush
patent: 3158345 (1964-11-01), Wilhelm et al.

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