Crossing bell and flasher

Details Crossing bell and flasher Crossing bell and flasher

1982-09-28

1986-09-23

Reese, Randolph

Railway switches and signals

Signals

Light beam projecting

246126, 246294, 340326, 340942, B61L 1304, B61L 2928

Patent

active

046131035

ABSTRACT:
A model railroad crossing bell and flasher employs spaced photocell detectors along the model railroad track. A comparator receives the photocell detector output signals and upon detecting a train shadow provides power to a first oscillator which actuates a pair of light emitting diodes in alternate sequence. Simultaneously, the first oscillator provides power to a second oscillator of a different frequency than the first oscillator. The second oscillator attenuates the first oscillator output signal to create a ringing sound through a loud speaker.

REFERENCES:
patent: 3381219 (1968-04-01), Dumbeck
patent: 3425156 (1969-02-01), Field
patent: 3631392 (1971-12-01), Zelina
patent: 3765006 (1973-10-01), Takahashi et al.
patent: 4293851 (1981-10-01), Beyl, Jr.
patent: 4294035 (1981-10-01), Klein
patent: 4369943 (1983-01-01), Hussein
"Practical Electronic Projects for Model Railroaders", Thorne, P. Kalmbach, Milwaukee, Wisconsin, 1974, pp. 44,45,56 and 57.
"Crossing Bell and Flasher", Bulletin of National Model Railroad Assoc., Waldon, G., 1977, vol. 43, No. 4, pp. 18-20.
"Detection Circuit", Model Railroader, Paul, Aug. 1973, vol. 40, No. 8, pp. 65-67.
"Train Detection Circuit for TTL Systems", Model Railroader, 1977, vol. 44, No. 1, pp. 98-100.
Automatic Diamond Crossing Control, Practical Electronics, vol. 18, No. 7 (Jul. 1982).

Affiliated with

Also associated with

Rating

Crossing bell and flasher does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Crossing bell and flasher, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crossing bell and flasher will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-762416