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Патент USA US3090958

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May 21, 1963
N. c. CREMER
3,090,948
RECEPTACLE PLUG TO PROTECT APPLIANCE THEFT
Filed 001'’. 31, 1961
NORMAN C. CREMER
INVENTOR
BY
ATTORNEY
United States Patent 0 ” rice
3,9?348
Patented May 21, 1953
2
3,090,948
RECEPTACLE PLUG TO PROTECT APPLIANCE
THEFT
Norman C. Cremer, 402 ‘Random ‘Road, Baltimore, Md.
Filed Oct. 31, 1961, Ser. No. 149,114
3 Claims. (Cl. 340-280)
This invention relates generally to alarm devices, and
more particularly it pertains to a power mains receptacle
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 re
quired to the contact pins 42 of this dummy plug 46.
Obviously, many modi?cations and variations of the
present invention are possible in light of ‘the above teach
ings. It is, therefore, to be understood that within the
arrangement for giving warning upon the detachment 10 scope of the appended claims the invention may be prac
ticed otherwise than as speci?cally ‘described.
of an ‘appliance plug.
What is claimed is:
It is the object of this invention to provide a switch
1. In combination, ‘a socket having a hot wire termi
element in an electric receptacle which is operable by its
nal and a ground wire terminal for connecting to hot and
Another object of this invention is to provide an elec 15 ground conductors, respectively, of an electric power
main, said socket having a pair of openings therein for
tric circuit requiring a minimum of wiring; in combina
receiving spaced contact pins and an aperture extending
tion with a novel appliance plug and mains receptacle
therein, means including a resilient leaf spring attached to
which will sound a local or remote warning signal upon
said hot wire terminal and located directly below said
the disconnection of the plug from the receptacle.
aperture, a contact blade engageable by said leaf spring,
And yet another object ‘of this invention is to provide
a warning device connected to said contact blade and to
a dummy plug for disabling a warning system receptacle.
said ground terminal, and a plug for said socket having
These and other objects ‘and advantages of this inven
a pair of spaced contact pins for making contact with
tion will become more readily apparent and understood
said hot wire and ground wire terminals and an actuator
from the accompanying speci?cation and single sheet
25 plunger for passing through said aperture in said socket
of drawings in which:
for depressing said leaf spring so as to interrupt the cir
FIG. 1 is a front elevation of a duplex wall receptacle
cuitry between the hot wire terminal and said alarm de
incorporating features of this invention;
vice, whereby when said plug is removed from said
FIG. 2 is a cross sectional view of the receptacle of
socket, the circuitry between said hot wire terminal and
FIG. 1 taken along the line 2——-2 and including a co
operative plug and alarm bell of the warning system; of 30 said alarm device is completed-to give an indication of the
removal of said plug.
this invention; and
2. In combination, a plug having a pair of spaced con
FIG. 3 is a side elevation of a dummy plug for use in
tact pins and an actuator plunger spaced from said pins,
disabling the alarm system of this invention.
a power mains receptacle device for giving warning upon
Referring now to the details of the drawings, in FIGS.
1 and 2 there is shown a duplex wall receptacle 10. 35 the detachment ‘of said plug, said device consisting of at
least one socket having a hot wire terminal and a ground
This receptacle 10 consists of a pair of modi?ed spaced
wire terminal for connecting to hot and ground conduc
sockets 12 having the usual hot wire terminals 14 and
tors, respectively, of an electric power main, said socket
ground wire terminals 16.
mating plug.
having a pair of spaced openings therein for receiving
In the usual manner, these terminals 14 and 16 are con
nected to the respective hot conductor 24 and ground 40 said spaced contact pins for connection to said hot wire
and ground wire terminals and also an aperture extending
conductor 26 of the electric power mains.
therein,
means including a resilient leaf spring attached
An aperture 18 is provided in each socket 12, and it
to said hot wire terminal and located directly below said
communicates to the interior thereof as best shown in
aperture, a contact ‘blade engageable by said leaf spring,
FIG. 2. A resilient leaf spring 20, which is attached to
the hot wire terminal 14, is located directly beneath 4.5 and a warning device connected to said contact blade
and to said ground terminal, whereby when said spaced
each aperture 18 and it makes electric contact with the
contact pins of said plug are positioned in said openings,
underside of a contact blade 22.
7
they contact said hot wire and ground wire terminals
An alarm conductor 28 is routed to the desired loca
and said actuator plunger passes ‘through said aperture
tion 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 con
venient 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 condi
50 in said socket for depressing said leaf spring so as to in
terrupt 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 re
55 ceptacle device for giving warning upon the detach
ment of said plug, said device consisting of a socket hav
ing a hot wire terminal and a ground wire terminal for
tioner, or refrigerator. When the plug 34 is inserted into
connecting to hot and ground conductors, respectively,
its respective socket 12 to power the appliance through
of an electric power main, said socket having a pair
the usual contact pins 36, an actuator plunger 38, which
is attached to the plug 34, passes through the aperture 60 of spaced openings and an aperture therein, a resilient
leaf spring attached to said hot wire terminal and located
18 and depresses the spring 2%). Consequently, as long
directly below said aperture, a contact blade engageable
as the plug 34 remains seated in the socket 12 the cir
by said leaf spring, and a warning device connected to
cuitry between the hot conductor 24 and the alarm con
said contact blade and to said ground terminal, said
ductor is interrupted.
Should there be an accidental or unauthorized removal
65 spaced contact pins of said plug contacting said hot wire
and ground wire terminals and said actuator plunger
of the plug 34, the leaf spring 2:’) is no longer held de
passing
through said aperture in said socket to depress
pressed by the plunger 38 and hot circuit contact is made
said leaf spring so as to interrupt the circuitry between the
to the contact blade 22 whereby the warning device 36
hot wire terminal and said alarm device when said plug
gives an alarm.
70 is assembled to said device and when said plug is removed
When there is an ‘authorized removal of the appliance
from said socket, said circuitry between said hot wire
for repairs or other reason, vthe alarm 30 is disabled by
3,090,948
"
3
4
terminal and said alarm {device is completed ‘to give an
indication of the removal 'of said plug.
,
y
References Cited in the ?le of this patent
UNITED STATES PATENTS
D. 151,571
Tillinghast ___________ __ Oct. 26, 1948
1,312,191
2,799,852
-=—
2,609,409
V
V
McDonnell _____ .__‘..__~____ Aug. 5, 1919
Barnes ____.= __________ __ July 16, 1927
Radeke ____‘ __________ __ Sept. 2, 1952
2,970,286
Modrey ______________ _._ Jan. 31, 1961
525,752
France _____________ .._ Oct. 9, 1920
5.
FOREIGN PATENTS
.
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