Railway switches and signals – Electric actuation – Car-actuated circuit controllers
Patent
1982-12-30
1985-06-25
Reese, Randolph
Railway switches and signals
Electric actuation
Car-actuated circuit controllers
246249, 340941, 377 9, B61L 116
Patent
active
045249326
ABSTRACT:
A Hall effect element, incorporated into an integrated circuit unit with temperature compensation, voltage regulation, and amplification, is mounted on top of a permanent magnet made of ceramic material with the critical Hall axis aligned with the magnet pole axis. To avoid saturating the Hall cell, it is positioned within a pole-to-pole hole in the magnet, which creates a flux null space. The permanent magnet and Hall cell assembly is mounted on the rail a predetermined distance below the top so that the flange of passing wheels occupies the air gap between the magnet and the rail through which the major portion of the magnet flux flows. Reduction of the air gap increases the level of the magnet flux and thus the level of voltage output of the Hall cell. The output of the Hall cell is applied to a Schmitt trigger whose switching level is set by a threshold voltage unit. Increased Hall output voltage actuates the trigger circuit which applies the signal to a switching transistor whose output in turn is applied to a pulse detector which registers the wheel detection. The magnet, Hall circuit element, and processing network are encapsulated within an epoxy material which is fitted for direct mounting to the base of the track rail on the gauge side.
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American Standard Inc.
Reese Randolph
Sotak J. B.
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