Railway switches and signals – Electric actuation – Control circuits
Patent
1973-02-05
1976-06-15
Mayer, Albert J.
Railway switches and signals
Electric actuation
Control circuits
246 8, 246 30, 246167R, 325 54, 325 55, 340 48, 343770, H04b 100
Patent
active
RE0288675
ABSTRACT:
A communication system between mobile and wayside stations wherein the mobile stations are traveling on a track which is divided into sections by means of an open-type transmission line paralleling the track. A frequency selection and conversion device for each section of transmission line or track is connected to the transmission line to define the length of each section. A series of lower frequency carriers transmitted on the line are allotted respectively to each specific section of transmission line. These low-frequency carriers travel with a low loss along the transmission line and they are selected and converted by their respective frequency selection and converter device to a common high-frequency carrier signal for leaky transmission to a mobile station on the corresponding track section. These signals are used for train control and other communication signals may be transmitted on the same transmission line by a high-frequency carrier signal which is common to all sections, such that the common signal will leak from the transmission line for reception by a mobile station no matter its location on the track.
REFERENCES:
patent: 2808584 (1957-10-01), Kock
patent: 2818565 (1957-12-01), Ajioka et al.
patent: 2929065 (1960-03-01), Kreinheder
patent: 3305682 (1967-02-01), Bolster et al.
patent: 3517315 (1970-06-01), Malm
Baba Takeshi
Maruhama Tetsuro
Nakahara Tsuneo
Shibuya Kenji
Yoshida Ken-ichi
Mayer Albert J.
Sumitomo Electric Industries Ltd.
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