Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1974-03-01
1976-07-20
Smith, Jr., David
Electrical transmission or interconnection systems
Switching systems
Switch actuation
H01H 700
Patent
active
039708640
ABSTRACT:
A fail-safe timing circuit energizable in response to a starting signal for activating a system, such as a fuel ignition system or an air conditioning system, includes a first switching circuit responsive to the request signal to activate the system to commence its operation tentatively, a time-out circuit responsive to the starting signal for generating a time-out signal after a predetermined time delay interval, a circuit responsive to a system variable such as the establishment of a flame in a fuel ignition system or the sufficient increase in oil pressure of a compressor in an air conditioning system becoming a predetermined condition, such as the flame occurring or the compressor oil pressure achieving a given desired value, for preventing the time-out circuit from generating its time-out signal, and a second switching circuit for causing the first switching circuit to de-activate the system in response to the time-out signal. As a result, the system is prevented from operating in an undesirable or unwanted manner should the system variable not reach the predetermined condition within the timing interval.
REFERENCES:
patent: 3270799 (1966-09-01), Pinckaers
patent: 3291183 (1966-12-01), Fairley
patent: 3441356 (1969-04-01), Walbridge
patent: 3649156 (1972-03-01), Conner
patent: 3726630 (1973-04-01), Potts
patent: 3770364 (1973-11-01), Walbridge
patent: 3832123 (1974-08-01), Walbridge
Johnson Service Company
Smith Jr. David
LandOfFree
Control arrangement fail-safe timing circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control arrangement fail-safe timing circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control arrangement fail-safe timing circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-558650