Device for the precise transverse positioning for a member displaceable along a rail of a railway track with respect to said rail
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United States of America Patent
Stats
-
Jun 4, 1991
Grant Date -
N/A
app pub date -
Oct 12, 1989
filing date -
Dec 19, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method for positioning with precision a member displaced along a rail transversely with respect to the symmetry axis of the head of the rail. According to this method, one emits through the head of the rail two ultrasound beams which are practically perpendicular to the fish plates of this rail. One receives the echoes of these beams reflected by the fish plates. One forms a regulation or adjusting signal which is a function of the time difference between the emission and the reception of its echo for each of the two ultrasound beams and uses this regulating signal to elaborate a control signal for the transverse positioning of the member.
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