US 3,938,121 A · Electrical wiring and alarm system

Abstract

A three-wire electrical wiring and alarm system has a remotely located alarm device that is turned on whenever an alarm switch is actuated. The alarm device may be wired into the system or it may be operated by a radio signal broadcast from the premises to be protected. In either case an unauthorized intruder is not made aware that the alarm has been signalled. The system has a manual alarm switch and a plurality of intrusion alarm switches, each operated automatically when a corresponding window or door is opened. Manually operated selector switches are provided for disconnecting the alarm switches from power sockets in the wiring system and for selectively enabling the window and door switches. A timer keeps the alarm device on for a predetermined time period following the operation of an alarm switch.

Drawings

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Drawings

Claims11

Dependent claims

In an electrical wiring and alarm system at a premises to be protected, said system having:

one or more receptacles, each having a common terminal and first and second supply terminals insulated from each other and from said common terminal and arranged so that one plug can be plugged into said first and common terminals and another plug can be concurrently plugged into said second and common terminals;
a first line conductor connected to said first supply terminals and connected to one side of a current supply;
a second line conductor connected to said common supply terminals and connected to the other side of said current supply;
a third line conductor connected to said second supply terminals;
and a wall switch connected between said first and third line conductors and operable when closed to connect said third line conductor to said one side of the current supply for turning on lights which are plugged into said second and common terminals of said one or more receptacles;
the improvement which comprises;
alarm switch means and first selector switch means connected by circuit means in series with each other between said first line conductor and said second supply terminals of the receptacles, whereby the opening of said first selector switch means disconnects said alarm switch means from said second supply terminals, said circuit means having a junction between said alarm switch means and said first selector switch means;
alarm signalling means operatively connected to said junction to be activated in response to the closing of said alarm switch means;
and second selector switch means connected in said circuit means for controlling the connection of said alarm switch means to said alarm signalling means.

6 more elements

Dependencies are inferred from the claim text.

Description2,131 words

Summary253 words

#The present application is directed to modifications of the invention disclosed in my Disclosure Document No. 013135, filed in the U.S. Patent Office.

#In my U.S. Pat. Nos. 3,466,454 and 3,543,268, I have disclosed and claimed an electrical wiring arrangement, including a special socket, which is designed to integrate an intrusion alarm system with the wiring system for the lighting and various electrically operated appliances in a residence.

#The present invention is directed to modifications or improvements in the integrated wiring and alarm system of said patents which provide a silent alarm so that the intruder is not alerted to the fact that his presence has been detected, as would be the case if an audible alarm device were located at the protected premises.

Brief description of the drawings2 figures

#Further objects and advantages of this invention will be apparent from the following detailed description of two presently-preferred embodiments, which are illustrated schematically in the accompanying drawing in which:

#FIG. 1 is a schematic electrical circuit diagram of a first embodiment of the present wiring and alarm system;

#FIG. 2 is a similar view of a second embodiment of the present system.

Detailed description1,816 words

#FIG. 1.

#Referring first to FIG. 1, the system has one or more receptacles 10, such as wall sockets, which preferably are constructed as disclosed in my previously-mentioned U.S. Pat. No. 3,466,454. Each receptacle has a common terminal 11 and first and second supply terminals 12 and 13, which are arranged such that an electrical plug (not shown) can be plugged into the first supply terminal 12 and the common terminal 11, and at the same time a second electrical plug can be plugged into the second supply terminal 13 and the common terminal 11. The three terminals 11, 12 and 13 are electrically insulated from each other.

#A first line conductor 14 is connected to the first supply terminals 12 of the sockets 10. A second line conductor 15 is connected to the common terminals 11 of these sockets. These line conductors 14 and 15 are connected across a suitable 115 volt A.C. power supply 16. With this arrangement, whenever an electrical appliance is plugged into the terminals 12, 11 of any one of the wall sockets 10, that appliance is connected across the power supply 16.

Facts

Application

05/495,322Filed 7 Aug 1974

Granted

10 Feb 1976

Term ended

10 Feb 1993

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification2 codes

G08B 13/08
Mechanical actuation: by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
G08B
Signalling systems

Electrical wiring and alarm system

Life of this patent

Electrical wiring and alarm system

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims11

Description2,131 words

Drawings

Classification2 codes

Life of this patent

Description2,131 words