Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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B ~qround of the Invention:
The p.resent invention relates to a bac~ up alarm
system. More particularly, the invention relates to a
back up alarm system for a burglar alarm system utilizing
an electric circuit.
The embodiments of FIGS. 1 to 4 a.re disclosed in
the United States Patent No. 4,012,728, issued to the
present inventor on Marc~ 15, 1977.
Alarm systemis are disclosed in United States
Patent No. 3,204,222, issued in August, 1965 ko Montroy
et al, United States Patent .No. 3,688,256, issued in
August, 1972 to D'Ausilio et al, United States Patent NoO
3,703,714, issued in November, 1972 to Andrews and United
States Patent No. 3,893,069, issued in July, 1975 to Mason.
O~jects of the in~ention are to provide a back up
ala.rm system for a burgla.r alarm sys-tem, w~ich bac~ u~
alarm system functions more effectively and more rapidly
than a silent burgla.r alarm system to provide complete
p.rotection from burglars, since the back up alarm system
functions efficiently, effectively and reliably by wireless
transmission to wa.rn of t~e cutting of an elect.rical con-
ductor of a burglar alarm system circuit and to warn of -the
short-circuiting of electrical conductors of a burglar
alarm system such as, for example, by wire cutters.
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Brief_Description of the Drawinqs:
In order that the invention may be readily
carried into effect, it will now be described with
reference to the accompanying drawings, wherein:
; FIG. 1 is a block diagram illustrating the
basic back up alarm system of the invention;
FIG, 2 iS a block diagram of a first embodiment
of the bacX up alarm system of the invention;
FIGo 3 is a block diagram of a second embodiment
of the back up alarm system of the invention; :. :
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FIGo 4 is a block diagram of a third embodiment
~ of the back up alarm system of the invention;
:;; FIG~ 5 i5 a block diagram of a fourth embodiment
; of the back up alarm system of the invention; and .
: FIGo 6 is a block diagram of a fifth embodiment
of the back up alarm system of the invention~
In the FIGS~ the same components are identified
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by the same reference numerals.
Detailed Descri~tion of the _nvention:
The back up alarm system of the invention is for
a burglar alarm system utilizing an electric circuit 1 ~.
haviny electrical conductors (not shown in the FIGSo)o
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T'he back up alarm system of the invention com-
prises a loek in relay 2 electrically connected to the
electric circuit 1 of t'he burglar alar~ system. The relay
2 may comprise any suitable relay having an energizing
winding and a relay switch or relay contacts controlled in
position by such energizing winding. In the embodiments of
FIGS~ 20 3 and 4, the energizing winding of the relay 2 is
energized by the eireuit 1 of the burglar alarm and maintains
the relay eontaets normal]y open, so that as long as the
burglar alarm cireuit is elosed and the burglary alarm
system is in operative condition, t'he relay contacts are
open. As soon as a eonductor of the burglar alarm circuit
1 of the embodiments of FIGSo 2~ 3 and 4 is cut by a burglar,
or due to any other circumstance, so that the burglar alarm
system beeomes inoperative, the relay energizing winding
of the relay 2 eloses the relay contacts t'hereof, and the
relay energizing winding remains deenergized until it i.s
reset by a reset switc~, ~ereinafter describedO
In t'he embodiments of FIGSo 5 and 6, the energizing
winding of the relay 2 is deenergized, as is t'he eircuit 1
of the burglar alarm and said cireuit maintains the relay
contacts normally open, so t~at as long as the burglar
alarm eircuit remains deenergized and the burglar alaxm
system is in operative condition, the relay c~ntacts are
openO As soon as a conductor of the burglar alarm
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circuit 1 o~ t~e embodiments o FIGS. 5 and 6 is
energized or short-circuited, by a burglar, so that the
burglar alarm system becomesinoperative, the relay energiz-
ing winding of the relay 2 closes the relay contacts there-
of, and the relay energizing winding remains energized
until it is reset by the reset switch.
The back up alarm system further comprises
electrically conductive leads 3, 4 and 5 electrically
: connecting the lock in relay 2, a source of electrical
. 10 energy 6 of any suitable type such as, Eor example, a
: battery, and a radio transmitter 7 of any suitable type ~or
transmitting radio signals, in a back up circuit with t~e
burglar alarm circuit, as shown in FIG. lo
In the embodiments of FIGSo 2, 3 and 4, w~en an
electrical conductor of the burglar alarm circuit 1 is
cut, the relay energizing winding of the lock in relay 2
becomes deenergized and permits the relay contacts thereof
~ to close thereby closing the back up circuit to actuate the ~ :~
:~ transmitter 7. When the transmitter 7 of the embodiments
. 20 of FIGS. 2, 3 and 4 is actuatedj it transmits radio signals
indicating that an electrical conductor o~ the burglar
alarm circuit 1 has been cuto It also activates an
~ audible alarm such as, for example, a buzzer 8.
; In the embodiments of FIGS. 5 and 6, when an
~- electrical conductor of the burglar alarm circuit 1 is
~- short-circuited, the relay energizing winding of t~e
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lock in relay 2 becomas energiæed and permits t~e relay
contacts t~ereof to close thereby closing the back up
circuit to actuate the transmitter 7. When the trans-
mitter 7 of the embodiments o FIGS. 5 and 6 is actuated,
it transmits radio si.gnals indicat.ing that an elec-trical
conductor of the burglar alarm circuit 1 has been short-
circuited. It also activates the buzzer 8.
A reset switch 9 is electrically connected to the
lock in relay 2 ~or manually resetting the back up circu.it,
in the embodiments of FIGS. 2, 3~ 5 and 6. An additional
reset switch 9', which is normally open, is provided in
shunt with the battery 6, in the embodiment of FIG. 6.
; - A radio receiver 10 of any suitable known type
(FIGSo 2 and 6) receives signals transmitted by the
transmitter 7 thereby indicating an alarm condition at
such receiver.
The embodiments of FIGS. 3 and 4 include a
normally open control switch lock 11 and a key 12 which
fits a nor~ally~cclosed control switcho In the embodiment
; 20 of FIG. 6, the normally closed control switch 12l com-
.~ bines a key arrangement w~ich controls a normally open
:~ alarm switch or switches 18 and is connected to the loc~
... ~ in relay 2 and the battery 6. The key arrangement is
unlocked for operation by a key, as in the embodiments of
FIGS. 3 and 4O In the embodiment of FIG. 5, the normally
closed control switch 12l controls the electric circuit 1.
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In the embodiments of FIGSo 3 and 4, the
normally closed control switch or key 12 controls a mat
17 and a normally open alarm switch.. The control switc~
or key 12 is connected to the locl~ ln relay 2 and the
battery 16 and is unlocked for operation by a key.
In the embodiment of FIGo 3, a fire detector 13,
a panic switch 14, a trap 15 and the battery 16 are
connected in circuit with the loc~ in relay 20 The ~ire
detector 13 and the panic switch 14 should not be con-
trolled by any control switch, unless desiredO
The embodiment of FIGv 4 is the same as that ofFIG~ 3, except that in FIGo 4 the normally open control
switch lock 11 controls t~e trap 15 only, w~nereas in the
embodiment oE FIG~ 3 it controls the operation of ~he
fire de-tector 13 and the trap 15.
A trap is a switch or switches, connected in
series and normally closed, used as an alarm switch. The
trap may be on a door or a window and may comprise any
suitable type of alarm switchv The embodiment of FIG~ 6
includes the ~ire detector 13, the panic switch 14 and an
alarm switch or switches 18. The alarm switch or switches
of the embodiment of FIGo 6 are normally open and are
connected in circuit with the lock in relay 2. The alarm
switches 18 may be placed on doors or windows and may
comprise any suitable type of alarm switchesO
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While the invention has been described by means
of specific ex~m~les and in sp9cific e~bodiments, I do
not wish to be limited theretop for obvious modi-fications
: will occur to those skilled in the art without departing
from the spirit and scope of the invention.
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