Communications: electrical – Systems – Call station
Patent
1976-02-26
1977-02-22
Swann, III, Glen R.
Communications: electrical
Systems
Call station
200 511, 200 50B, 340421, G08B 1302
Patent
active
040094740
ABSTRACT:
An alarm system for indicating the unauthorized withdrawal of an appliance lead from a wall receptacle includes a spring biased arm extending partly through the ground connector opening of the receptacle against a microswitch. When the plug is in the receptacle the arm is displaced by the ground terminal of the plug away from the microswitch, opening the switch. The microswitch is connected in series with a master switch which, in turn, connects to an audio alarm. Upon withdrawal of the plug from the receptacle, the spring biasing forces of the arm direct the arm both across the ground terminal openings and against the micro-switch, closing the circuit to the alarm. Should the plug be removed, a slot is provided in the wall plate through which a key is insertable to withdraw the arm from the ground terminal opening, thus permitting reinsertion of the plug. In the alternative, the inventive alarm may include a latching relay, latched by the closure of the microswitch, and a master switch may be included in the circuit for on-off control.
REFERENCES:
patent: 3090948 (1963-05-01), Cremer
patent: 3114905 (1963-12-01), Sliman
patent: 3192518 (1965-06-01), Sliman
patent: 3786502 (1974-01-01), Stendig et al.
Babcock William C.
Swann III Glen R.
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