Title: Alarm system

Abstract: An alarm system detects the electrical disconnection of electrical equipment such as an appliance which connects by a power plug to a power receptacle on an AC power line. The detection and alarm generating portion of this system is preferably located in a conventional AC power receptacle box and includes a power receptacle which accomodates a conventional power plug from the electrical equipment. When the detection and alarm system is active, a pair of switches is set upon insertion of the plug into the receptacle and, thereafter, if the plug is removed from the receptacle, the alarm is energized. In various embodiments of the invention, the alarm is also energized when any of the following events occur: 1. The power line from the plug to the electrical equipment is cut or is short circuited to ground. 2. The system in the receptacle box is mechanically disturbed. 3. AC power fails and the plug is removed from the receptacle or the power line from the plug to the electrical equipment is cut or short circuited to ground and/or the system in the box is mechanically disturbed.

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Inventors: Girismen, Fahir (Carlisle, MA, US)

Application Number: 467654
Filing Date: 1974-05-07
Publication_date: 1976-08-10
Assignee:
Primary Class(es): 340/635 340/568.4, 340/687
Other Classes:
US Patent Ref:

2799852	Jul, 1957	Barnes	340/280.
3114904	Dec, 1963	Sliman	340/280.
3114905	Dec, 1963	Sliman	340/280.
3192518	Jun, 1965	Sliman	340/280.
3289194	Nov, 1966	King	340/280.
3382494	May, 1968	Mahacsek	340/280.
3609742	Sep, 1971	Burdick	340/280.
3618065	Nov, 1971	Trip et al.	340/280.
3644912	Feb, 1972	Alle, Jr.	340/310.
3781857	Dec, 1973	Stendig et al.	340/280.
3794989	Feb, 1974	Manley et al.	340/280.

Other Refs:
Primary Examiner: Swann, III, Glen R.
Assistant Examiner:
Attorney: Dunn; Robert T.