Alarm system for detecting a plurality of different alarm condit

Communications: electrical – Selective – Having indication or alarm

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

340521, 340533, G08B 1900

Patent

active

042504848

ABSTRACT:
An alarm system, particularly for use on a train, responsive to a plurality of different alarm conditions for providing outputs for indicating which one or ones of the alarm conditions have been detected. A signal having at least as many frequency components as there are alarm conditions is generated on a transmission line which runs the length of the area over which the conditions are to be detected. Alarm sensing switches are connected to taps of the transmission line, and each switch is connected to a frequency dependent impedance means which is resonant and has a low impedance at one of the frequencies. A filter is provided for each alarm condition to be detected, each such filter having a band pass at one of said resonant frequencies. The presence of an alarm condition causes an alarm switch to change state, which causes one of the impedance means to short circuit a frequency which otherwise would have been passed by one of the filters, thus indicating the presence of an alarm condition.

REFERENCES:
patent: 3797008 (1974-03-01), Yuasa
patent: 3949358 (1976-04-01), Higashi
patent: 4114150 (1978-09-01), Yamazaki et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Alarm system for detecting a plurality of different alarm condit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Alarm system for detecting a plurality of different alarm condit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alarm system for detecting a plurality of different alarm condit will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1667697

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.