Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3090948 A
Publication typeGrant
Publication dateMay 21, 1963
Filing dateOct 31, 1961
Priority dateOct 31, 1961
Publication numberUS 3090948 A, US 3090948A, US-A-3090948, US3090948 A, US3090948A
InventorsCremer Norman C
Original AssigneeCremer Norman C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Receptacle plug to protect appliance theft
US 3090948 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

May 21, 1963 N. c. CREMER 3,090,948

RECEPTACLE PLUG TO PROTECT APPLIANCE THEFT Filed 001'. 31, 1961 NORMAN C. CREMER INVENTOR ATTORNEY United States Patent 3,090,948 RECEPTACLE PLUG TO PROTECT APPLIANCE THEFT This invention relates generally to alarm devices, and more particularly it pertains to a power mains receptacle arrangement for giving warning upon the detachment of an appliance plug.

It is the object of this invention to provide a switch element in an electric receptacle which is operable by its mating plug.

Another object of this invention is to provide an electric circuit requiring a minimum of wiring; in combination with a novel appliance plug and mains receptacle which will sound a local or remote warning signal upon the disconnection of the plug from the receptacle.

And yet another object of this invention is to provide a dummy plug for disabling a warning system receptacle.

These and other objects and advantages of this invention will become more readily apparent and understood from the accompanying specification and single sheet of drawings in which:

FIG. 1 is a front elevation of a duplex wall receptacle incorporating features of this invention;

FIG. 2 is a cross sectional view of the receptacle of FIG. 1 taken along the line 2-2 and including a cooperative plug and alarm bell of the warning system; of this invention; and

FIG. 3 is a side elevation of a dummy plug for use in disabling the alarm system of this invention.

Referring now to the details of the drawings, in FIGS. 1 and 2 there is shown a duplex wall receptacle 10. This receptacle consists of a pair of modified spaced sockets 12 having the usual hot wire terminals 14 and ground wire terminals 16.

In the usual manner, these terminals 14 and 16 are connected to the respective hot conductor 24 and ground conductor 26 of the electric power mains.

An aperture 18 is provided in each socket 12, and it communicates to the interior thereof as best shown in FIG. 2. A resilient leaf spring 20, which is attached to the hot wire terminal 14, is located directly beneath each aperture 18 and it makes electric contact with the underside of a contact blade 22. 7

An alarm conductor 28 is routed to the desired location and it is connected to a warning device 39 such as a lamp, buzzer, or bell. The ground return wire 32 of the warning device 30 is then connected wherever convenient to the ground conductor 26 of the electric mains. Thus only one alarm wire is required for each receptacle socket 12 which is to be protected.

A special plug 34, as shown in FIG. 2, is used on the appliance, such as a radio or television set, an air conditioner, or refrigerator. When the plug 34 is inserted into its respective socket 12 to power the appliance through the usual contact pins 36, an actuator plunger 38, which is attached to the plug 34, passes through the aperture 18 and depresses the spring 2%). Consequently, as long as the plug 34 remains seated in the socket 12 the circuitry between the hot conductor 24 and the alarm conductor is interrupted.

Should there be an accidental or unauthorized removal of the plug 34, the leaf spring 2:) is no longer held depressed by the plunger 38 and hot circuit contact is made to the contact blade 22 whereby the warning device 36 gives an alarm.

When there is an authorized removal of the appliance for repairs or other reason, the alarm 30 is disabled by 3,9fi348 Patented May 21, 1953 use of a dummy plug 40 illustrated in FIG. '3. This dummy plug 40 is identical to the plug 34 having contact pins 42 and an actuator plunger 44 corresponding to the contact pins 36 and actuator plunger 38 as previously described. However, no electrical connectors are required to the contact pins 42 of this dummy plug 46.

Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

What is claimed is:

1. In combination, a socket having a hot wire terminal and a ground wire terminal for connecting to hot and ground conductors, respectively, of an electric power main, said socket having a pair of openings therein for receiving spaced contact pins and an aperture extending therein, means including a resilient leaf spring attached to said hot wire terminal and located directly below said aperture, a contact blade engageable by said leaf spring, a warning device connected to said contact blade and to said ground terminal, and a plug for said socket having a pair of spaced contact pins for making contact with said hot wire and ground wire terminals and an actuator plunger for passing through said aperture in said socket for depressing said leaf spring so as to interrupt the circuitry between the hot wire terminal and said alarm device, whereby when said plug is removed from said socket, the circuitry between said hot wire terminal and said alarm device is completed-to give an indication of the removal of said plug.

2. In combination, a plug having a pair of spaced contact pins and an actuator plunger spaced from said pins, a power mains receptacle device for giving warning upon the detachment of said plug, said device consisting of at least one socket having a hot wire terminal and a ground wire terminal for connecting to hot and ground conductors, respectively, of an electric power main, said socket having a pair of spaced openings therein for receiving said spaced contact pins for connection to said hot wire and ground wire terminals and also an aperture extending therein, means including a resilient leaf spring attached to said hot wire terminal and located directly below said aperture, a contact blade engageable by said leaf spring, and a warning device connected to said contact blade and to said ground terminal, whereby when said spaced contact pins of said plug are positioned in said openings, they contact said hot wire and ground wire terminals and said actuator plunger passes through said aperture in said socket for depressing said leaf spring so as to interrupt the circuitry between said hot wire terminal and said alarm device.

3. In combination, a plug having a pair of spaced contact pins and an actuator plunger, a power mains receptacle device for giving warning upon the detachment of said plug, said device consisting of a socket having a hot wire terminal and a ground wire terminal for connecting to hot and ground conductors, respectively, of an electric power main, said socket having a pair of spaced openings and an aperture therein, a resilient leaf spring attached to said hot wire terminal and located directly below said aperture, a contact blade engageable by said leaf spring, and a warning device connected to said contact blade and to said ground terminal, said spaced contact pins of said plug contacting said hot wire and ground wire terminals and said actuator plunger passing through said aperture in said socket to depress said leaf spring so as to interrupt the circuitry between the hot wire terminal and said alarm device when said plug is assembled to said device and when said plug is removed from said socket, said circuitry between said hot wire ice " 3 terminal and said alarm device is completed to give an 1,312,191 indication of the removal 'of said plug. 2,799,852

, y 2,609,409 References Cited in the file of this patent 2,970,286

UNITED STATES PATENTS D. 151,571 Tillinghast Oct. 26, 1948 525,752

4 V V McDonnell Aug. 5, 1919 Barnes July 16, 1927 Radeke Sept. 2, 1952 Modrey Jan. 31, 1961 FOREIGN PATENTS France Oct. 9, 1920

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1312191 *Oct 10, 1918Aug 5, 1919 I lanograph co
US2609409 *May 1, 1951Sep 2, 1952Poor & CoBattery cell inspecting and testing system
US2799852 *Nov 26, 1954Jul 16, 1957Barnes Robert ECurrent responsive signal devices
US2970286 *Mar 19, 1957Jan 31, 1961Modrey Henry JContinuous outlet strip
USD151571 *Jul 31, 1946Oct 26, 1948 Design for a dummy plug for electric outlets
FR525752A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3192518 *Aug 13, 1962Jun 29, 1965Sliman Michael TAlarm system
US3196225 *Apr 13, 1961Jul 20, 1965Gen Motors CorpRotary interrupter switch
US3314678 *Jul 9, 1963Apr 18, 1967Brunswick CorpMechanism for setting bowling pins at selected positions
US3427550 *Sep 28, 1966Feb 11, 1969Motorola IncUnit carrier
US3692966 *Jul 22, 1970Sep 19, 1972Cooke Eng Co TheMulti-circuit patch plug and jack
US3737591 *Oct 27, 1971Jun 5, 1973Alarm Products Int IncTrap switch with elongated mounting wire for completing continuity circuit
US3781857 *Feb 18, 1972Dec 25, 1973Davis CCondition responsive receptacles
US3912889 *Feb 14, 1974Oct 14, 1975Bendix CorpElectrical connector having an internal switch
US4009474 *Feb 26, 1976Feb 22, 1977Eller Chauncey BAlarm system for electrical receptacles
US4028691 *Apr 2, 1976Jun 7, 1977Abraham ZederTheft deterring apparatus
US4037223 *Apr 1, 1975Jul 19, 1977Tucci CorporationAudible alarm system for an electrical outlet
US4038505 *Mar 3, 1975Jul 26, 1977Motorola, Inc.Subminiature connector arrangement
US4053724 *Jun 19, 1975Oct 11, 1977Jesus Gomez LlonaPanel and plural module assembly having mechanical keying and modular plug structure to activate/deactivate automatically bridged load carrying circuits
US4075617 *May 17, 1976Feb 21, 1978Wireman Wallace HAlarm circuit for monitoring removal of plug from electrical power receptacle
US4189723 *Feb 28, 1978Feb 19, 1980Hylton Earl AElectrical receptacle provided with an alarm system
US4224486 *Mar 5, 1979Sep 23, 1980Amp IncorporatedShunt protected power connector
US4256936 *Oct 27, 1978Mar 17, 1981Dynatech Laboratories, Inc.Electrical jack and patch cord assemblies
US4855719 *Feb 17, 1987Aug 8, 1989Hermetic Switch, Inc.Electrical receptable alarm switch
US4894019 *Jun 20, 1989Jan 16, 1990Delta Systems, Inc.Torsion spring shorting connector
US5138134 *Dec 22, 1988Aug 11, 1992Ellison Mearl EDecorative wall hanging heater
US5220139 *Dec 12, 1991Jun 15, 1993Valeo VisionHigh security high tension lamp and connector assembly, in particular for car lighting
US5258744 *Jul 5, 1991Nov 2, 1993Abraham ZederAnnunciator apparatus for monitoring electrical connections
US5347095 *Jan 14, 1993Sep 13, 1994Abraham ZederElectrical receptacle for use with annunciator apparatus for monitoring electrical connections
US5418521 *Nov 24, 1993May 23, 1995Read; RobertPower cable with alarm
US5525965 *Mar 23, 1995Jun 11, 1996Crg Enterprises, Inc.Appliance theft prevention alarm
US8902065Jan 29, 2013Dec 2, 2014Jonathan WillisSecurity alarm system device and component for securing outdoor appliances
DE3838657A1 *Nov 15, 1988May 17, 1990Bayerische Motoren Werke AgDevice for detecting the inadvertent loosening of the two plug parts of an electrical connector
Classifications
U.S. Classification340/568.3, 340/538, 439/133, 340/656, 200/51.1
International ClassificationG08B13/14, H01R13/70, H01R13/703
Cooperative ClassificationH01R13/7035, G08B13/1409
European ClassificationH01R13/703C, G08B13/14B