Vital wheel detector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 13, 1997
Grant Date -
N/A
app pub date -
Dec 12, 1995
filing date -
Dec 12, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vital wheel detector for railways injects an oscillating electrical current into a short rail segment and produces a monitor signal in response the magnetic field around the rail. A high Q pickup coil is employed which, when a car wheel is present on the rail segment, sharply decreases in Q and significantly reduces the level of the monitor signal. Any failure of the detector apparatus is in a safe mode, as a loss of rail current results in a loss of the monitor signal whether through an electrical or a mechanical failure. Also, internal mechanical or electrical failures either interrupt the current to the rail or interrupt transmission of the monitor signal to the processing logic.
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