Railway switches and signals – Block-signal systems – Automatic
Patent
1983-01-17
1986-02-18
Caldwell, Sr., John W.
Railway switches and signals
Block-signal systems
Automatic
246122R, 246247, B61L 2100, B61L 334
Patent
active
045708827
ABSTRACT:
A vital, or fail-safe, track circuit wheel detector for detecting the presence and position in a given detection zone of wheel-axles on railroad cars; in order to provide the requisite fail-safe indication, the operation of the system relies on a sensing means which produces two distinct output signals. The sensing means includes a biasing arrangement for providing, even in the absence of wheel-axles, a steady output signal derived from the path of normal feed current flow. This bias signal is countered or opposed by a wheel sensing signal from the same sensing means responsive to flux level changes resulting from the presence of particular directional components of wheel-axle shunt current, whereby a dip or net reduced signal is effectuated; in the case of open circuit conditions, the output indication goes to zero when there are no wheel-axles in the detection zone.
REFERENCES:
patent: 2537298 (1951-01-01), Baughman
patent: 2993116 (1961-07-01), Utt
patent: 3353018 (1967-11-01), Gray
patent: 3740549 (1973-06-01), Thorne-Booth
patent: 3979092 (1976-09-01), Perry
patent: 3984073 (1976-10-01), Woods
patent: 4351504 (1982-09-01), Frielinghaus
patent: 4373691 (1983-02-01), Fricke
patent: 4392626 (1983-07-01), Pascoe
patent: 4469298 (1984-09-01), Uebel
Caldwell Sr. John W.
General Signal Corporation
Heim Michael F.
Kleinman Milton E.
Ohlandt John F.
LandOfFree
Vital track circuit wheel detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vital track circuit wheel detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vital track circuit wheel detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1547159