Block occupancy detector for model railroads

Details Block occupancy detector for model railroads Block occupancy detector for model railroads

1996-11-12

1998-05-19

Le, Mark T.

Railway switches and signals

Train-position indication

Miniature model

246 34R, 246246, 246249, 246255, B61L 1300

Patent

active

057526770

ABSTRACT:
This invention pertains to model railroads and specifically to the problem of detecting the presence or absence of cars, locomotives, or obstructions which may occupy a particular section of track. Modulated signals of radio frequency are applied to the track via a balanced transformer and detected synchronously. A circuit is provided for nulling the detected signal in the absence of any occupation in such a manner that any change in detected signal represents an item which occupies that track section. The use of radio frequency signals and synchronous detection enables the system to be very sensitive, and to detect objects which do not necessarily form a direct current path across the rails.

REFERENCES:
patent: 2460597 (1949-02-01), Rodgers
patent: 3333096 (1967-07-01), Ohman et al.
patent: 4351504 (1982-09-01), Frielinghaus
patent: 4469298 (1984-09-01), Uebel
patent: 4487385 (1984-12-01), Salmon
patent: 5145131 (1992-09-01), Franke
patent: 5417388 (1995-05-01), Stillwell
P. Mallery, "Electrical Handbook for Model Railroads", (1955) pp. 174-190.
L. H. Westcott, "Twin-T Signalling", Model Railroader, Jun., 1958 pp. 36-41.
C. Small, A. Madle, Model Railroader, Jul. 1947, pp. 536-539.
Hibbs, May, Model Railroader, Sep. 1947, pp. 742-744.
van Allen, Electronics, Dec. 1949, pp. 148-156.
L. H. Westcott, Model Railroader, Mar. 1950, pp. 62-64.

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