Title: Control arrangement fail-safe timing circuit

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.

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Inventors: Matthews, Russell B. (Goshen, IN, US)

Application Number: 447165
Filing Date: 1974-03-01
Publication_date: 1976-07-20
Assignee: Johnson Service Company (Milwaukee, WI)
Primary Class(es): 307/141
Other Classes:
US Patent Ref:

3270799	Sep, 1966	Pinckaers	431/25.
3291183	Dec, 1966	Fairley	431/78.
3441356	Apr, 1969	Walbridge	431/66.
3649156	Mar, 1972	Conner	431/78.
3726630	Apr, 1973	Potts	431/78.
3770364	Nov, 1973	Walbridge	431/78.
3832123	Aug, 1974	Walbridge	431/78.

Other Refs:
Primary Examiner: Smith, Jr., David
Assistant Examiner:
Attorney: Johnson, Dienner, Emrich & Wagner