Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1985-10-23
1987-07-21
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
34030915, 340514, 340552, 340 51, 340 52H, 340 56, 340 61, 340903, 180167, G08B 2900, G08B 100, G08G 114
Patent
active
046821538
ABSTRACT:
A fail-safe sensor system to provide a positive indication of the proper operation of a sensor system by accounting for the return signals from an active zone and a monitor zone beyond. Search signals, provided by a transducer operating in the transmit mode, are transmitted within an active zone within which objects to be detected are expected to be located. Unreturned search signals are permitted to travel beyond the active zone into a monitor zone beyond and objects in such monitor zone cause return signals which are also employed. A counter feed from a free running clock source is permitted to run up a count whose predetermined limit represents the estimated maximum time period during which a sensor system should operate without contacting an object. Return signals, whether from objects in the active zone or the monitor zone, reset the counter back to zero. The absence of a return signal permits the counter to exceed its predetermined limit and produce an output signal which can be directed to control circuitry, an alarm or logic circuitry to determine if the system is operative.
REFERENCES:
patent: 3383678 (1968-05-01), Palmer
patent: 3787838 (1974-01-01), Feintuch et al.
patent: 3979740 (1976-09-01), Forbat et al.
patent: 3982238 (1976-09-01), Byers
patent: 4012732 (1977-03-01), Herrick
patent: 4092633 (1978-05-01), Fletcher et al.
Boozer James M.
Kumasaka Alan J.
Lindlau Paul F.
Mayer Robert W.
Strelecki Paul R.
Amerace Corporation
Crosland Donnie L.
Teschner David
LandOfFree
Fail-safe sensor system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fail-safe sensor system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fail-safe sensor system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-209981