U.S. patent number 3,648,268 [Application Number 04/873,468] was granted by the patent office on 1972-03-07 for surveillance and alarm system.
Invention is credited to Melvin Paull.
United States Patent |
3,648,268 |
Paull |
March 7, 1972 |
SURVEILLANCE AND ALARM SYSTEM
Abstract
A surveillance and alarm system having a plurality of entry
responsive means for detecting entry into predetermined locations
throughout a building, and indicating means for maintaining
surveillance on the building and for indicating the number and
locations of entries into the locations. Means are also provided
for maintaining a closed series loop circuit between entry
responsive means and for indicating any interruption in signal in
the series loop circuit. The system further includes an external
signalling device responsive to an entry or an interruption in
signal, and means for selecting any one of several system mode
variations.
Inventors: |
Paull; Melvin (St. Louis,
MO) |
Family
ID: |
25361693 |
Appl.
No.: |
04/873,468 |
Filed: |
November 3, 1969 |
Current U.S.
Class: |
340/506; 340/517;
340/524; 340/545.9; 340/693.2 |
Current CPC
Class: |
G08B
13/22 (20130101) |
Current International
Class: |
G08B
13/22 (20060101); G08b 013/22 () |
Field of
Search: |
;340/213,213.1,214,409,412,333,274,276 ;317/135 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Trafton; David L.
Claims
What is claimed is:
1. A surveillance and alarm system for a building comprising a
plurality of entry responsive means, a line out responsive means,
the entry responsive means and line out responsive means being
electrically connected together in a normally closed series loop
circuit, the line out responsive means being responsive to an
interruption in the signal in the closed series loop circuit, means
associated with each of the entry responsive means for supplying
power to the remaining entry responsive means in the closed series
loop circuit when one or more of the entry responsive means are
actuated, external signalling means responsive to the actuation of
any of the entry responsive means or the line out responsive means,
means responsive to the actuation of each of the entry responsive
means for indicating the number and location of the entries, and
means for supplying power to the system.
2. A surveillance and alarm system of claim 1 including means for
holding activated external signalling means and indicating means in
the activated condition.
3. The surveillance and alarm system of claim 2 including means for
releasing the holding means.
4. The surveillance and alarm system of claim 2 including means for
setting the system in any one of several mode variations.
5. The surveillance and alarm system of claim 4 wherein one mode
variation is with both the external signalling means and the
indicating means responsive, and another mode variation is with
just the indicating means responsive.
6. The surveillance and alarm system of claim 4 wherein the means
for setting the system in any one of several mode variations
includes a key switch having a surveillance and an alarm
position.
7. The surveillance and alarm system of claim 6 including means for
releasing the holding means, wherein said releasing means is
responsive to placing the key switch in the alarm position
providing automatic resetting of the entry responsive means when
the key switch is placed in the alarm position.
8. The surveillance and alarm system of claim 6 wherein the means
for setting the system in any one of several mode variations
further includes means responsive to the key switch setting for
selecting the responsiveness of the external signalling means.
9. The surveillance and alarm system of claim 8 including a means
for making the external signalling means responsive to the
actuation of the entry responsive means or line out responsive
means regardless of the mode setting of the key switch.
10. The surveillance and alarm system of claim 9 wherein the last
named making means includes an inside alarm set switch which when
closed makes the external signalling means responsive to the
actuation of the entry responsive or line out responsive means
regardless of the mode setting of the key switch.
11. The surveillance and alarm system of claim 9 including
indicating means responsive to the actuation of the line out
responsive means, and internal sounding device responsive to the
actuation of the entry responsive means or the line out responsive
means, means for deactivating the internal sounding device, and
means for holding activated external signalling means and
indicating means in the activated condition.
12. The surveillance and alarm system of claim 2 including a panic
switch which when closed connects a signal from the power supply
means directly to the external signalling means.
13. The surveillance and alarm system of claim 2 including
indicating means responsive to the actuation of the line out
responsive means.
14. The surveillance and alarm system of claim 13 including a case
interlock switch in the series loop circuit, whereby opening the
case interlock switch interrupts the power signal in the closed
series loop circuit causing the line out responsive means to
actuate and the external signalling means and the line out
indicating means to respond.
15. The surveillance and alarm system of claim 2 including an
internal sounding device responsive to the actuation of the entry
responsive means or the line out responsive means.
16. The surveillance and alarm system of claim 15 including means
for deenergizing the internal sounding device.
17. The surveillance and alarm system of claim 2 including means
for testing the operation of the entry responsive means.
18. The surveillance and alarm system of claim 1 wherein the power
supply includes an auxiliary battery power supply, a rectified line
power supply, and means for automatically switching from the
rectified line power supply to the auxiliary battery power supply
when the line power be interrupted.
19. The surveillance and alarm system of claim 2 including means
for preventing the line out responsive means from responding to
short temporary interruptions in the signal in the closed series
loop circuit, and for providing an exciting signal to the line out
responsive means placing the line out responsive means in its set
position immediately upon energizing the system.
20. The surveillance and alarm system of claim 2 wherein the
plurality of entry responsive means comprises a plurality of
station switches having normally closed and normally open
positions, and a relay associated with each station switch having
normally closed and normally open positions and a plurality of sets
of contacts, each station switch and relay combination being
electrically connected through normally closed terminals in a
closed series loop circuit; and the line out responsive means
comprises a line out relay having normally closed and normally open
positions and a plurality of sets of contacts, the coil of the line
out relay being electrically connected in the closed series loop
circuit, whereby the line out relay is energized and in the
normally closed position.
21. The surveillance and alarm system of claim 20 wherein the means
associated with each of the entry responsive means comprises means
associated with each station switch and relay combination for
supplying a power signal to the series loop circuit when any of the
station switch and relay combinations are placed in the normally
open position.
22. The surveillance and alarm system of claim 21 wherein the
external signalling means is responsive to the placing of any
station switch and relay combination in the normally open position,
or the placing of the line out relay in the normally open position,
and the indicating means for indicating the number and location of
the entries is responsive to the placing of any of the station
switch and relay combinations in the normally open position.
23. The surveillance and alarm system of claim 2 wherein the
indicating means comprises a light indicator for each station
switch in the system, means electrically connecting each light
indicator to its associated station switch and relay combination,
and means for energizing each light indicator whenever its
associated station switch and relay combination is placed in the
normally open position.
24. The surveillance and alarm system of claim 23 including a line
out indicator, the line out indicator being electrically connected
to the line out relay, and means for energizing the line out
indicator whenever the line out relay is placed in its normally
open position.
25. The surveillance and alarm system of claim 24 wherein the light
indicator associated with each station switch and the line out
indicator are mounted on a control panel.
26. The surveillance and alarm system of claim 23 including a key
switch having an alarm and a surveillance position, an on-off
switch having an open and closed position, means responsive to the
placing of the on-off switch in its closed position for providing a
signal to the key switch, a latching relay having an alarm and a
surveillance position, the position of the latching relay being
determined by the position of the key switch, and means responsive
to the placing of the latching relay in its alarm position for
supplying a signal to the closed series loop circuit, whereby
closing the on-off switch provides a signal to the key switch which
when placed in its alarm position will cause the latching relay to
be placed in its alarm position applying a signal to the closed
series loop circuit.
27. The surveillance and alarm system of claim 26 including means
responsive to the placing of the on-off switch in its closed
position for providing a signal directly to the closed series loop
circuit.
28. The surveillance and alarm system of claim 27 wherein a signal
line is electrically connected to each station switch and relay
combination and the line out relay and becomes energized when any
of the station switch and relay combinations or line out relay are
placed in the normally open condition, and including means for
connecting the signal line to the external signalling means through
the latching relay, the last-mentioned connecting means providing
activation of the external signalling means with the key switch in
the alarm position but not in the surveillance position.
29. The surveillance and alarm system of claim 28 including an
inside alarm set switch having an open and a closed position, the
inside alarm set switch connected between the signal line and the
external signalling means and across the latching relay, whereby
closing the inside alarm set switch, allows any signal on the
signal line to bypass the latching relay and energize the external
signalling means regardless of the position setting of the key
switch.
30. The surveillance and alarm system of claim 28 including an
internal sounding device connected to the signal line and activated
whenever there is a signal on the signal line.
31. The surveillance and alarm system of claim 30 including an
audio silence relay having a normally closed and a normally open
position and at least one set of contacts, the internal sounding
device being connected to the signal line through normally closed
contacts of the audio silence relay.
32. The surveillance and alarm system of claim 31 including an
audio release switch having a closed and an open position, means
connecting the power supply signal to the coil of the audio silence
relay when the audio release switch is closed, whereby closing the
audio release switch places the audio silence relay in the normally
open position, interrupting the signal from the signal line to the
internal sounding device, deenergizing the sounding device.
33. The surveillance and alarm system of claim 32 wherein the audio
silence relay is provided with at least two sets of contacts and
the series loop circuit is fed through the second set of contacts
in the audio silence relay and the key switch.
34. The surveillance and alarm system of claim 23 including means
for holding each of the relays associated with the station switches
in the normally open position once it has been placed in that
position.
35. The surveillance and alarm system of claim 34 including means
for releasing the holding means, allowing the relays to return to
their normally closed position.
36. The surveillance and alarm system of claim 35 wherein the
holding means includes a holding line, a reset relay having a
normally closed and normally open position and a plurality of sets
of contacts, and means for applying a holding signal to the holding
line through normally closed contacts of the reset relay.
37. The surveillance and alarm system of claim 36 wherein the means
for releasing the holding means includes a reset switch having an
open and a closed position and means connecting the power supply
signal to the coil of the reset relay when the reset switch is
closed, placing the reset relay in it normally open position,
whereby closing the reset switch and placing the reset relay in the
normally open position interrupts the holding signal and resets the
relays associates with the plurality of station switches.
38. The surveillance and alarm system of claim 37 wherein the
series loop circuit is fed through a set of contacts in the reset
relay.
39. The surveillance and alarm system of claim 36 including means
for applying a signal to the coil of the reset relay through the
key switch when placed in the alarm position, whereby placing the
key switch in the alarm position places the reset relay in the
normally open position interrupting the holding signal thereby
providing automatic resetting of the relays associated with the
station switches.
40. The surveillance and alarm system of claim 23 including a panic
switch which when closed connects the signal from the power supply
directly to the external signalling means.
41. The surveillance and alarm system of claim 23 wherein the power
supply includes an auxiliary battery power supply, a rectified line
power supply, and means for automatically switching from the
rectified line power supply to the auxiliary battery power supply
when the line power be interrupted.
42. The surveillance and alarm system of claim 23 including a test
switch having a closed and an open position, and means for
connecting the power signal to the coils of the relays associated
with the station switches when the test switch is closed.
43. The surveillance and alarm system of claim 20 wherein the
system relays are mounted in a box and including a case interlock
switch having a closed and an open position connected in the series
loop circuit and means for mounting the case interlock switch in
the box so that the case interlock switch is placed in the open
position interrupting the signal in the closed series loop circuit
causing the line out relay to be placed in its normally open
position when the cover of the box is removed.
Description
SUMMARY OF THE INVENTION
The surveillance and alarm system of this invention comprises a
plurality of station switches at predetermined locations throughout
the building in which the system is installed and responsive to
entries through the locations, such as doors or windows, where the
station switches at located. A relay having a plurality of sets of
contacts is associated with each station switch. Each station
switch is connected to its associated relay and to the other
station switch and relay combinations in a closed series loop
circuit, which circuit is energized when the system is set to any
of its mode variations. Also included in the closed series loop
circuit is the coil of a line out relay which is energized by the
signal in the closed series loop circuit, placing the line out
relay in its normally closed position. The line out relay is
actuated by an interruption in the signal in the closed series loop
circuit such as for example, when a line in the loop is cut.
Manual switches are provided for setting the system in any one of
several possible mode variations, such as the surveillance mode or
burglar alarm mode. One of the manual switches, the key switch, is
mounted on one of the outside doors of the building and is used to
set the system in the burglar alarm mode. Most of the other manual
switches are located in a convenient place such as on a control
panel.
Various signalling devices and indicators are included in the
system and operate depending on the mode setting. An external
signalling device which could be a siren, a bell, a connection to
the police station or another similar type of signalling device, is
set to operate when the system is in the burglar alarm mode. The
system is also provided with a panic switch, which when closed will
energize the external signalling device; and an inside alarm set
switch, which when closed will energize the external signalling
device whenever any one or more of the station switch and relay
combinations or the line out relay is actuated, regardless of the
system mode setting.
Indicators responsive to the actuation of each station switch and
relay combination, and the line out relay, indicate the number and
location of entries.
Other features of the invention are a test mode to test the
operation of the relay associated with each station switch, and a
signal release to reset the system.
Thus, it will become clear that this invention is both an alarm
system and a surveillance system which may be combined in various
mode settings, and includes features designed to minimize failure
of the system.
BRIEF DESCRIPTION OF THE DRAWING
The drawing is a schematic diagram of the surveillance and alarm
system of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the drawing there is shown a power supply 10, a control panel
11, an external signalling device 12, and a plurality of station
switches 21-30. The station switches 21-30 are located at various
positions throughout the building such as at the doors or windows
or wherever protection is desired. While in this embodiment of the
invention there is described a system having 10 stations, obviously
any number of stations may be used. Only the stations 21, 22 and 30
are shown on the diagram. The remaining stations 23-29, are
identical to the stations 21, 22 and 30 and were therefore
omitted.
POWER SUPPLY
The power supply 10 includes a transformer 31 which drops the line
voltage to a rectifier network 32. The signal from the rectifier
network 32 is applied to the coil 33 of a relay 34. A resistor 35
is in series with the coil 33 of the relay 34 to reduce the voltage
across the coil 33 to an amount less than the voltage across the
coils of the other relays in the system. This will cause the relay
34 to deenergize and switch to the auxiliary power supply before
the other relays in the system deenergize. The rectified voltage is
fed from the bottom of the resistor 35 through a line 36 to the
normally closed terminal of the contacts 37 of the relay 34. The
drawing depicts the relay 34 in the normally closed position. A
battery 38 is connected by a line 39 to the normally open terminal
of the relay 34 and acts as a secondary or backup power supply
should the line power for any reason be interrupted. A lead 40
which is the power lead to the surveillance and alarm system is
connected to the center terminal of the relay 34. Thus, it can be
seen from the drawing that the rectified voltage at the coil 33 of
the relay 34 holds the contacts 37 in the normally closed position.
With the contacts 37 in the normally closed position, the rectified
voltage is fed from the bottom of the resistor 35 through the line
36 and the normally closed and center terminals of the contacts 37
of the relay 34 to the line 40. If for any reason the line power is
interruped, the coil 33 of the relay 34 will deenergize placing the
relay 34 in the normally open position. With the relay 34 in the
normally open position, the voltage from the battery 38 is fed
through the line 39 and the normally open and center terminals of
the contacts 37 of the relay 34 to the line 40.
The remainder of the surveillance and alarm system will be
described with the various manual switches positioned as they would
be under normal operating conditions. Unless it is specified to the
contrary, it may be assumed that each of the relays shown in the
drawings is shown in its normally closed position.
BURGLAR ALARM MODE
There are seven manual switches shown in the drawing. These
switches are: the key switch 50, the on-off switch 51, the panic
switch 52, the inside alarm set switch 53, the reset switch 54, the
audio release switch 55, and the test switch 56. By appropriately
setting these switches, various modes of operation may be selected.
The first mode which will be described is the burglar alarm mode.
For this mode, the key switch 50 is placed in the burglar alarm
position, (this is where the wiper arm 60 of the key switch 50
joins the center terminal 61 to the alarm terminal 62) the
surveillance switch 51 in the closed position, and all of the other
manual switches 52, 53, 54, 55, and 56 in the open position.
With the key switch 50 in the burglar alarm position and the on -
off switch 51 in the on position, the signal on line 40 is fed
through a line 63, a line 64, the on - off switch 51, a line 65,
and a line 66 to reset relay 67. The reset relay 67 has a coil 68
and four sets of contacts A, B, C, and D, with the reset relay 67
deenergized in its normally closed position, no signal having as
yet been applied to the coil 68, the signal on the line 66 is fed
through the center and normally closed terminals of the set of
contacts C of the reset relay 67 through a line 69 to a line 70. As
will be seen, it is the line 70 which supplied holding voltage to
each of the relays associated with the station switches 21 through
30 and supplies the voltage to actuate the external signalling
device 12 when the normally open contact of any one of the station
switches 21-30 is closed.
When the on-off switch 51 is closed, an initial pulse appears on
the line 66 which is fed through a capacitor 71 and lines 72 and 73
to the coil of a line out relay which will be hereinafter
described.
Each of the station switches 21-30 has three contacts: a center
contact, a normally open contact, and a normally closed contact.
Associated with each of the station switches 21-30, is a relay 75
having a coil 76 and four sets of contacts A, B, C, and D. The coil
76 has in parallel with it a capacitor 77. The line 70 is connected
to the center terminal of the set of contacts A of each of the
relays 75 with appropriate leads 80, 81, etc.
The signal on the line 66 is fed through a line 85 to the center
terminal of the station switch 21 and the normally open terminal of
the set of contacts D of each of the relays 75 associated with the
station switches 21-30. Using the station switch 21 and its
associated relay 75 as an example, the signal on the line 85 is fed
through a line 86 to a line 87. One end of the line 87 is connected
to the center terminal of the station switch 21 and the other end
is connected to the normally open terminal of the set of contacts D
of the relay 75. With the station switch 21 in the normally closed
position, the signal on the line 87 is fed through the center and
normally closed terminals of the station switch 21, a line 88, the
normally closed and center terminals of the set of contacts D of
the relay 75, and a line 89 to the center terminal of the station
switch 22. With the station switch 22 likewise in the normally
closed position, the signal on the line 89 is fed through the
center and normally closed terminals of station switch 22, a line
90, the normally closed and center terminal of the set of contacts
D of the relay 75 associated with the station switch 22, and a line
91 to the center terminal of the station switch 23. In like manner,
the signal is carried through each of the 10 station switches and
set of contacts D of the relay 75 associated therewith forming a
closed series loop circuit the purpose of which will be
explained.
With the station switch 30 in the normally closed position, the
signal at its center and normally closed terminals is fed through a
line 92, the normally closed and center terminals of the set of
contacts D of the associated relay 75, and a line 93 to the
terminal 61 of the key switch 50.
With the key switch 50 in the burglar alarm position the signal on
the line 93 is fed to the terminal 61 and through the wiper arm 60
to the terminal 62 of the key switch 50, and then through a line
100 to a latching relay 101. The latching relay 101 is of the type
that once it is activated to one of its two possible positions, it
will stay in that position until it is activated to the other
position.
The latching relay 101 has two coils 102 and 103. The coil 102 is
the surveillance coil and the coil 103 is the alarm coil. Each of
the coils 102 and 103 has a capacitor 104 in parallel with it. The
latching relay 101 is further comprised of five sets of contacts A,
B, C, D, and E, each set having three terminals. The left terminals
of each of the sets will be referred to as the surveillance
terminals, the right terminals will be referred to as the alarm
terminals, and the middle terminals will be referred to as the
center terminals.
At this point it should be noted that the key switch 50 is designed
so that it requires a key to operate it, and can only be operated
from outside the door. Also, to enter through the door where the
key switch 50 is located requires that the key switch 50 be placed
in the surveillance position. It will be seen that the position of
the latching relay 101 is determined by and corresponds to the
position of the key switch 50, hence prior to setting the key
switch 50 in the alarm position, the latching relay 101 was in the
surveillance position.
Therefore, with the latching relay 101 still in its surveillance
position, the signal on the line 100 is fed through the
surveillance and center terminals of the contacts C of the latching
relay 101, a line 105, a diode 106, and a line 107 to the coil 68
of the reset relay 67. The coil 68 is energized placing the relay
67 in the normally open position. The signal at the line 105 is fed
through a line 108 to the normally open terminal of the set of
contacts B of the reset relay 67. With the relay 67 in the normally
open position, the signal on the line 108 is fed through the
normally open and center terminals of the set of contacts B of the
reset relay 67, and a line 109 to the alarm coil 103 of the
latching relay 101, energizing the alarm coil 103 and placing the
latching relay 101 in the alarm position.
The signal on the line 40 is fed through a line 115, and now with
the latching relay 67 in the alarm position, through the alarm and
center terminals of the set of contacts D of the latching relay 101
and a line 116 to the line 66. When the alarm coil 103 of the
latching relay 101 became energized placing the latching relay 101
in the alarm position, the electrical contact between the center
and surveillance terminals of the set of contacts C of the latching
relay 101 was broken, removing the signal on the coil 68 of the
reset relay 67 causing the reset relay 67 to deenergize. Hence,
after the latching relay 101 is placed in the alarm position the
reset relay 67 returns to its normally closed position. With the
reset relay 67 returned to its normally closed position the signal
on the line 66 is again fed through the center and normally closed
terminals of the set of contacts C of the reset relay 67, and the
line 69, to the line 70, thereby maintaining the signal on the
closed series loop circuit described above and which will be
further described below.
At this point it should be noted that the line 66 which feeds the
closed series loop circuit and the holding line 70 first received
its signal through the on - off switch 51, but later after the
latching relay 101 is placed in its alarm position, receives the
signal through the latching relay 101 independent of the on-off
switch 51. Hence, it can be seen that once the latching relay 101
is placed in the alarm position, the on - off switch could be
opened with no loss of signal to the system.
Returning to the signal on the alarm terminal 62 of the key switch
50 and on the line 100 connected at one end to the alarm terminal
62, the signal on the line 100 is also fed through a line 117, a
diode 118, a line 119, and a line 120 to the center terminal of a
set of contacts B of an audio silence relay 121.
The audio silence relay 121 has a coil 122 and two sets of contacts
A and B. With the audio silence relay 121 in the normally closed
position as shown, the signal on the line 120 is fed through the
center and normally closed terminals of the set of contacts B of
the audio silence relay 121, a line 123 and a line 124 to the
center terminal of the set of contacts D of the reset relay 67.
With the reset relay deenergized to the normally closed position,
as explained above, the signal on the line 124 is fed through the
center and normally closed terminals of the set of contacts D of
the reset relay 67, a line 125 and a line 126, a case interlock
switch 127 shown on the drawing in the normally closed position,
and a line 128 to the center terminal of a set of contacts A of a
line out relay 130.
The line out relay 130 has a coil 131 and three sets of contacts A,
B, and C. As was stated above, an initial pulse was supplied to the
coil 131 through the capacitor 71 which energized the coil 131
placing the line out relay 130 in its normally closed position.
With the relay 130 in its normally closed position, the signal on
the line 128 is fed through the center and normally closed terminal
of the set of contacts A of the line out relay 130 and lines 132
and 73 to the coil 131, holding the line out relay 130 in the
normally closed position. Once the line out relay 130 is closed, it
will stay closed as long as there is voltage on the line 128. If
for any reason the voltage on the line 128 is interrupted, the line
out relay will deenergize and will be placed in the normally open
position.
At this point it should be noted that the normally open terminal of
the set of contacts B of the audio silence relay 121 is connected
by a line 135 to the line 124 which effectively shorts the closed
and open terminals of the set of contacts B of the audio silence
relay 121. Likewise, the normally open terminal of the set of
contacts D of the reset relay 67 is connected by a line 136 to the
line 126 which effectively shorts the open and closed terminals of
the set of contacts D of the reset relay 67. This is done so that
the coil 131 of the line out relay 130 will receive a signal
regardless of the positions of the reset relay 67 and the audio
silence relay 121. The reason for feeding the signal on the line 93
through the key switch 50, the audio silence 121, and the reset
relay 67 and then into the line out relay 130, is to maintain a
closed series loop through as many parts of the system as possible.
This is explained in more detail below.
A line 137 is connected at one end to the normally open terminal of
the set of contacts C of the line out relay 130 and at the other
end to the line 66. A line 138 is connected at one end to the
center terminal of the set of contacts C of the line out relay 130
and at the other end to a line out light indicator 139 located on
the control panel 11. A line 142 is connected between the line 72
and the center terminal of the set of contacts A of the reset relay
67. A signal line 143 is connected between the normally open
terminals of the sets of contacts A and B of the relay 75
associated with the station switches 21-30 and a line 144. One end
of the line 144 is connected to the alarm terminal of the set of
contacts E of the latching relay 101 and at the other end to one
side of the inside alarm set switch 53. A line 145 is connected at
one end to the center terminal of the set of contacts E of the
latching relay 101 and at the other end to a line 146 one end of
which is connected to the external signalling device 12. The
external signalling device 12 may be a bell, a siren, a telephone
connection to the police station, or any other suitable signalling
means. Thus, taking the station switch 21 as an example, the
normally open terminal of the set of contacts B of the relay 75
associated with the station switch 21 is connected to the normally
open terminal on the set of contacts A of the relay 75 with the
lines 147 and 148. The lines 147 and 148 are connected to the line
143. The other relays 75 associated with the other station switches
22-30 are connected to the line 143 in like manner.
The normally open terminal of each of the station switches 21-30 is
connected to the normally closed terminals of the set of contacts B
and C of their associated relays 75. Again, taking station switch
21 as an example, a line 150 is connected at one end to the
normally open terminal of the station switch 21 and the other end
to one end of each of the lines 151 and 152. The other ends of the
lines 151 and 152 are connected to the normally closed terminals of
the set of contacts C and B respectively of the associated relay
75. A line 155 is connected at one end to the center terminal of
the set of contacts B of the relay 75 and at the other end to a
light indicator 156 located on the control panel 11. Similarly,
light indicators 157-165 associated with the other station switches
22-30 are also located on the control panel 11. A line 166 is
connected at one end to the line 155 and at the other end to the
coil 76 of the relay 75.
OPERATION IN THE BURGLAR ALARM MODE
The operation of the surveillance and alarm system in the burglar
mode will now be described. This mode is used as for example, where
the building in which the alarm system is installed is to be left
unoccupied for a period of time. With all of the windows and doors
and other locations where the station switches are located secured
and the on-off switch 51 on the control panel 11 closed, the person
setting the alarm leaves the building through the door where the
key switch is located. After closing the door behind him and using
his key he locks the key switch 50 in the burglar alarm
position.
With the on - off switch 51 closed and the key switch 50 in the
alarm position, power is supplied to the system as described above.
The operation of the system will now be explained where an entry is
made through one of the stations where the station switches are
located. Since the circuits of each of the station switches 21-30
and their associated relays 75 are identical, it is only necessary
to explain the operation of one of the station switches and its
associated relay 75 where an entry occurs where that station switch
is located. Assume that station switch 21 is positioned at a window
in the building and that an entry is made through that window. The
station switch 21 is so positioned that if the window at which it
is located is opened, the station switch 21 moves from its normally
closed to its normally open position. The signal on the line 85
will now be fed through the center and normally open terminals of
the station switch 21 through the lines 150 and 152, the normally
closed and center terminals of the set of contacts B of the relay
75, the lines 155, 166 to the coil 76 of the relay 75. This will
cause the coil 76 to energize placing the relay 75 in its normally
open position. With the line 155 connected to the light indicator
156 on the control panel 11, whenever a signal is applied to the
coil 76 of the relay 75 associated with the station switch 21, the
light 156 associated with the station switch 21 will light,
indicating the station through which entry was made.
With the relay 75 associated with the station switch 21 in the
normally open position the signal on the line 70 is fed through the
line 80, the center and normally open terminals of the set of
contacts A of the relay 75, the lines 148 and 147, the normally
open and center terminals of the set of contacts B of the relay 75,
and the lines 155 and 166 to the coil 76 of the relay 75, holding
the relay 75 in the normally open position. The signal on the
normally open terminal of the set of contacts A of the relay 75 is
also fed through the line 148 and the signal line 143, the line 144
(and remembering that the latching relay 101 is in the alarm
position) the alarm and center terminals of the set of contacts E
of the latching relay 101 and the lines 145 and 146 to the external
signalling device 12. Hence, whenever one of the station switches
is placed in its normally open position, such as when entry is made
at one of the stations, the external signalling device 12 is
energized and an appropriate light on the control panel 11
indicates the station through which entry was made. Once any one of
the relays 75 is activated by placing one of the station switches
21-30 in the normally open position, the relay will stay activated
and the external signalling device 12 will remain on even though
the station switch is returned to its normally closed position;
that is, even though the door or window is closed. In other words,
once the alarm is triggered it stays on until the holding signal is
cut, such as with the reset switch 54 as will be described.
It is important to know, however, not only that an entry has been
made, but how many and where the entries were made should there be
more than one. For this reason it is important to keep the series
loop circuit energized so that entry at any one or all of the other
stations can be detected. This result is accomplished by connecting
one end of the line 87 to the normally open terminal of the set of
contacts D of the relay 75 associated with the station switch 21 as
stated above. When entry is made at the station switch 21, and the
station switch 21 is placed in its normally open position, the
signal on the line 87 is fed through the normally open and center
terminals of the set of contacts D of the relay 75 associated with
the station switch 21 through the line 89 to the center terminal of
the station switch 22. Hence, it can be seen that with the station
switch 21 in either the normally open or the normally closed
position, a signal is maintained on the line 89, and the series
loop circuit remains energized. With the series loop circuit so
energized, an entry at one or more of the other stations will be
indicated by the appropriate lights on the control panel 11 in the
same manner as was described with respect to station switch 21.
This feature of the invention proves very useful in determining how
many entries there were and the location of the intruder should he
still be in the building. For example, when the alarm goes off, the
police can enter the building, look at the control panel and
determine immediately where the entries occurred, and, if station
switches are appropriately located at the internal doors of the
building, the general location in the building of the intruder.
The purpose of the capacitor 71 is to maintain the voltage on the
coil 131 of the line out relay 130 during the period of time that
it takes for any of the station switches 21-30 and their associates
relays 75, the reset relay 67, the audio silence relay 121, the
power supply relay 34, or the key switch 50 to switch from one
position to another. If the capacitor 71 was not in the circuit,
the coil 131 of the line out relay 130 could lose its signal and
deenergize to the normally open position every time one of these
switches or relays changed positions, causing the external
signalling device 12 to become energized and the line out indicator
139 on the control panel 11 to light. Another purpose of the
capacitor 71 which has already been described, is to supply an
initial pulse to the coil 131 for placing the line out relay 130 in
the normally closed position.
The purpose of the line out relay 130 is to indicate whenever the
series loop circuit is opened. This could occur where the station
switch, at the location where the entry was made, opens, but fails
to make contact in the normally open position, where the intruder
cuts one of the lines in the series loop circuit, breaks one of the
lines or the wiper arm 60 while tampering with the key switch 50,
or where the case interlock switch 127 is opened. The case
interlock switch is mounted at the box where the relays used in the
system are located, and is positioned so that it is closed when the
cover is on the relay box and open when the cover is removed. Thus,
if an intruder attempts to remove the relay box cover the case
interlock switch 127 will open. Any of these occurrences will
interrupt the circuit removing the signal at the center and
normally closed terminals of the set of contacts A of the line out
relay 130, the lines 132 and 73 and the coil 131. The line out
relay 130 will thereby become deenergized placing it in the
normally open position. When this occurs, two things happen: the
signal on the line 66 is fed through the line 137, the normally
open and center terminals of the set of contacts C of the line out
relay 130, and the line 138 to the line out indicator 139 on the
control panel 11, causing the line out indicator 139 to light.
Also, the signal on the line 70 is fed through the center and
normally open terminals of the set of contacts B of the line out
relay 130, a line 167, the lines 143 and 144, the alarm and center
terminals of the set of contacts E of the latching relay 101, and
the lines 145 and 146 to the external signalling device 12.
Therefore, whenever a break occurs in one of the lines of the
series loop circuit the line out relay 130 will deenergize causing
the external signalling device 12 to go on and the line out
indicator 139 on the control panel 11 to light. The capacitor 71
prevents a false indication should only a temporary interruption
occur in the series loop circuit as described above.
SURVEILLANCE MODE
The surveillance mode is used where it is not necessarily desirable
to set off an external alarm, but it is desirable to keep
surveillance on the building. For example, a night watchman in a
commercial office building can maintain surveillance by simply
observing the control panel 11. The control panel 11 could be
located in any convenient place such as the lobby of the building
or the security office. This mode could also be used by a
homeowner. The control panel 11 could be located in the
bedroom.
The manual switches for the surveillance mode are positioned with
the on - off switch 51 closed, as in the burglar alarm mode, and
the key switch 50 in the surveillance position. The remaining
manual switches such as the panic switch 52, the inside alarm set
switch 53, the reset switch 54, the audio release switch 55 and the
test switch 56 are all set in the open position.
With the on-off switch 51 closed, the signal from the power supply
10 is fed through the line 40, the on-off switch 51, the line 66,
the reset relay 67, the line 70, to each of the relays 75, and also
through the line 85 and the series loop circuit to the line 93 as
described in detail for the burglar alarm mode.
With the key switch 50 set to the surveillance position, that is,
with the wiper arm 60 of the key switch 50 connecting the terminals
61 and 169, the signal on the line 93 is fed through the key switch
50 and a line 169 to the alarm terminal of the set of contacts B of
the latching relay 101. Since the latching relay 101 was in the
alarm position prior to placing the key switch 50 in the
surveillance position, the signal on the line 168 is fed through
the alarm and center terminals of the set of contacts B of the
latching relay 101 and a line 170 to the surveillance coil 102 of
the latching relay 101. Also, when the key switch 50 was placed
from the alarm to the surveillance position, the signal was removed
from the alarm coil 103 of the latching relay 101 thereby
deenergizing the alarm coil 103. With a signal on the surveillance
coil 102, the surveillance coil 102 becomes energized placing the
latching relay 101 in the surveillance position. The signal on the
line 169 is also fed through a line 172, a diode 173, and a line
174 to the line 120 and so on through the remainder of the series
loop circuit maintaining a signal in the series loop circuit as was
the case in the burglar alarm mode.
An internal signalling device, such as a buzzer 180 is also
provided. The buzzer 180 is shown on the drawing mounted on the
control panel 11 although it could be mounted in any convenient
location in the building. The buzzer 180 is electrically connected
by a line 181 to the normally closed terminal of the set of
contacts A of the audio silence relay 121. The center terminal of
the set of contacts A is connected by a line 182 to the signal line
143.
OPERATION IN THE SURVEILLANCE MODE
Again, assume that an entry occurs at the location of the station
switch 21. Just as in the burglar alarm mode, the station switch 21
will be placed in the normally open position which will cause the
coil 76 of the associated relay 75 to energize placing the relay 75
in the normally open position. In addition to energizing the coil
76 of the relay 75, it will cause the corresponding light 156 on
the control panel 11 to light, thereby indicating where the entry
occurred. Also, as described in the burglar alarm mode above, a
signal will appear on the signal lines 143 and 144. However, unlike
in the burglar alarm mode, in the surveillance mode the latching
relay 101 is in the surveillance position which opens the alarm and
center terminals of the set of contacts E of the latching relay
101. Hence, the signal on the line 144 cannot feed through the
alarm and center terminals of the set of contacts E of the latching
relay 101 and the lines 145 and 146 to the external signalling
device 12. In other word, the external signalling device 12 will
not operate in the surveillance mode. However, the signal on the
line 143 will be fed through the line 182, the center and normally
closed terminals of the set of contacts A of the audio silence
relay 121, through the line 181 to the buzzer 180. The buzzer 180
acts as a sound signal to alert the watchman that an entry has been
made and to look at the control panel 11. Just as in the burglar
alarm mode the lights on the control panel 11 will indicate where
and how many entries there were and locate the position of the
intruder in the building. If the line out relay 130 should become
deenergized placing it in the normally open position, such as if
one of the lines in the series loop circuit is cut, this will
energize the signal line 143 as described in the burglar alarm
mode, which will energize the buzzer 180. The line out indicator
139 will also light as described above.
Therefore, it can be seen that the surveillance mode is used
primarily for the purpose of keeping surveillance over the building
and not for the purpose of setting off an external alarm. However,
two methods are provided for setting off the external signalling
device 12 in conjunction with the surveillance mode if desired.
PANIC MODE
One method is to simply manually close the panic switch 52. With
the panic switch 52 closed, the signal on the line 40 is fed
through the line 63, a line 185, the panic switch 52, a line 186,
and a line 146 to the external signalling device 12. No matter what
mode the system is in, closing the panic switch 52 will apply the
signal from the power supply 10 directly to the external signalling
device 12. Hence, closing the panic switch 52 will energize the
external signalling device 12 even where the rest of the system
remains undisturbed. The panic switch 52 could be used for example,
where prowlers are observed outside the building, but no entry has
been made.
INSIDE ALARM SET MODE
Another way to set off the external signalling device 12 in the
surveillance mode, is to close the inside alarm set switch 53. With
the inside alarm set switch 53 closed, whenever a signal appears on
the line 143 it will be fed through the line 144, the inside alarm
set switch 53, a line 187, and the lines 145 and 146 to the
external signalling device 12. However, unlike the panic switch 52,
the inside alarm set switch 53 activates the external signalling
device 12 only when a signal is present on the signal line 143,
which is when one of the station switch relays 75 is energized or
the line out relay 130 deenergized. Therefore, the external alarm
circuit can be activated in the surveillance mode by simply closing
the inside alarm set switch 53 or the panic switch 52.
AUDIO RELEASE MODE
Once the internal buzzer 180 has been energized and has alerted the
person in the building that an entry has been made and to watch the
control panel 11, the buzzer 180 has served its purpose. It may,
therefore, be desirable to deenergize the internal buzzer 180 after
it has signalled an alert. This can be accomplished in any of the
modes by simply closing the audio release switch 55. With the audio
release switch 55 closed, the voltage on the signal line 143 is fed
through a line 190, the audio release switch 55 and the lines 191
and 192 to the coil 122 of the audio silence relay 121. The coil
122 is thereby energized placing the audio silence relay 121 in the
normally open position. When this occurs, the contact between the
center and normally closed terminals of the set of contacts A of
the audio silence relay 121 is broken and the signal to the line
181 and the internal buzzer 180 is interrupted thereby deenergizing
the buzzer 180. On end of the line 191 is connected to the normally
open terminal of the set of contacts A of the audio silence relay
121, so that when the audio silence relay 121 is energized the
signal on the line 182 will be fed through the lines 191 and 192 to
the coil 122 to hold the relay 121 in the normally open position.
Of course, the lights on the control panel 11 continue to indicate
the number and location of entries made since the audio release
switch 55 does nothing to remove the signals to the light
indicators.
TEST MODE
The test mode is provided for the purpose of insuring that each of
the relays at the various station switches 21-30 are operating
properly. The manual switches for the test mode are positioned with
the on-off switch 51 and test switch 56 closed, the key switch 50
in the surveillance position and all of the other manual switches
open. With the on-off switch 51 and the test switch 56 closed, the
signal on the line 63 is fed through the line 64, the on-off switch
51, the line 65, a line 193, the test switch 56 and a line 194 to
the center terminal of the set of contacts C of the corresponding
relay 75 to the station switch 21. With the station switch 21 and
its corresponding relay 75 in the normally closed position the
signal on the test line 194 is fed through the center and normally
closed terminals of the set of contacts C of the relay 75, the
lines 151 and 152, the normally closed and center terminals of the
set of contacts B of the relay 75, and lines 155 and 166 to the
coil 76 of the relay 75. The coil 76 is thereby energized placing
the relay 75 in the normally open position. The signal on the line
155 lights the corresponding light indicator 156 on the control
panel 11 indicating that the coil 76 of the relay 75 is receiving a
signal. With the relay 75 now in the normally open position and
held in the normally open position with the signal on the line 80
as described above, the signal on the test line 194 is fed through
the center and normally open terminals of the set of contacts C of
the relay 75 associated with the station switch 21 and a line 195
to the center terminal of the set of contacts C of the relay 75
associated with the station switch 22. Just as with the relay 75
associated with the station switch 21, the relay 75 associated with
the station switch 22 will now energize and the corresponding light
157 on the control panel 11 will light, indicating that the coil 76
of the relay 75 associated with the station switch 22 is receiving
a signal and that the relay 75 associated with station switch 21 is
operating correctly. The test signal will then be fed to the next
station switch relay, and so on to the next, until all of the
station switch relays have been energized as will be indicated by
the successive lighting of the light indicators 156-165 on the
control panel 11. Thus, when the test switch is closed, the
location indicator lights 156-165 on the control panel 11 should
indicate in sequence that each of the relays associated with the
station switches 21 through 30 is operating properly. If for
example, only the indicators 156-159 associated with the station
switches 21-24 should light, this is a good indication that the
relay 75 associated with the station switch 25 is stuck in the
normally closed position.
The burglar alarm and surveillance modes can also be used as an
easy and convenient method of testing and trouble shooting the
system.
Suppose the burglar alarm mode is to be used. Under normal
operation of the system, one of the station switches 21-30 is
located at the same door with the key switch 50, for example,
station switch 22. With the on-off switch 51 closed, when the door
is opened (the key switch 50 being in the surveillance position),
the station switch 22 will be placed in its normally open position
causing the internal buzzer 180 to sound just as described in the
surveillance mode. The sound of the buzzer 180 is an indication
that a large part of the system is operating correctly. When the
door is closed placing the station switch 22 in its normally closed
position and the key switch 50 placed in the alarm position, the
coil 68 of the reset relay 67 is energized, placing the reset relay
67 in the normally open position as described in the burglar alarm
mode. With the reset relay 67 in the normally open position there
is no contact between the center and normally closed terminals of
the set of contacts C of the reset relay 67, and the signal on the
line 66 cannot get through the reset relay 67 to the lines 69 and
70 and the holding line 81. Hence, the signals on the lines 69, 70,
and 81 are interrupted, and the relay 75 associated with the
station switch 22 will be reset to its normally closed position.
This will cause the buzzer 180 to lose its signal.
Therefore, it can be seen that the reason for feeding the power
signal through the reset relay 67 is to provide an automatic signal
release and resetting of the station switch relays 75 to their
normally closed positions when the key switch 50 is placed in the
burglar alarm position.
With respect to the surveillance mode, suppose for example, that
all of the windows and doors where the station switches 21-30 are
located are closed, but that the external signalling device 12 goes
off when the key switch 50 is placed in the burglar alarm position
or the internal buzzer 180 sounds when the system is in the
surveillance mode. This could mean that one of the station switches
21-30 is stuck in the normally open position. This can be easily
determined by placing the system in the surveillance mode and
observing the location indicators 156-165 on the control panel 11.
If for example, the indicator 160 associated with the station
switch 25 is on, this indicates that the station switch 25 is stuck
in the normally open position.
As another example, suppose one of the station switches is
intermittent, that is, suppose it goes to its normally open
position for a few seconds and then returns to its normally closed
position. Intermittent problems such as this can be the most
difficult to solve. However, by using the surveillance mode, such
intermittence will be permanently recorded by the appropriate light
indicator on=the control panel 11, for when the switch is in its
normally open position, the appropriate indicator will light and
remain lit as an indication of which of the switches is
malfunctioning.
Still another example of how the surveillance mode can be used to
trouble shoot the system is where a break occurs in the closed
series loop circuit as indicated by the line out indicator 139. The
locations of the break can be ascertained at least within limits by
placing the system in the surveillance mode and opening the windows
and doors where the station switches are located. As described
above, power is supplied to the closed series loop circuit even
when one or more of the station switches are placed in the normally
open position. Thus, if for example, a break occurs in the loop
circuit between station switches 29 and 30, the light indicators
156-164 will light, but not light indicator 165. This indicates
that the break is somewhere between station switches 29 and 30.
Hence, the proper use of the burglar alarm, surveillance and test
modes can greatly reduce maintenance and repair time by testing the
system and pinpointing the trouble.
THE RESET RELEASE
The reset switch 54 is located on the control panel 11, and is
provided for the purpose of resetting the relays 75 associated with
each of the station switches 21-30. Again, using station switch 21
as an example, suppose that the station switch 21 is located at a
window and an entry is made through the window causing the station
switch 21 to be placed in its normally open position and energizing
the relay 75. Once the relay 75 is energized, the signal on the
line 80 will hold the relay 75 in its normally open position.
Therefore, even if the window at which the station switch 21 is
located is closed, the relay 75 will remain in the normally open
position. The only way the relay 75 can be placed back in its
normally closed position is by removing the holding signal on the
line 80. This can be accomplished by closing the reset switch 54 on
the control panel 11. The reset switch 54 must be operated with the
on-off switch closed. With both the reset switch 54 and the on-off
switch 51 closed, the signal on the line 63 is fed through the line
64, the on-off switch 51, the line 65, a line 200, the reset switch
54, and a line 201 to the center terminal of the set of contacts A
of the latching relay 101. With the latching relay 101 in the
surveillance position, which would be the case since the key switch
50 would be in the surveillance position, the signal on the line
201 is fed through the center and surveillance terminals of the set
of contacts A of the latching relay 101 and through the line 107 to
the coil 68 of the reset relay 67. The coil 68 is thereby energized
placing the reset relay 67 in the normally open position,
interrupting the signal on the line 66 at the center terminal of
the set of contacts C of the reset relay 67. This will cause the
lines 69 and 70 and the holding line 80 to lose their signal and
the relay 75 associated with the station switch 21 to reset to its
normally closed position. The other relays 75 associated with the
station switches 22-30 reset in the same manner.
It should be obvious, however, that the reset switch 54 will reset
the station switch relays 75 only if the condition causing one or
more of the relays to be placed in its normally open position is
corrected. Hence, if one of the doors or windows where the station
switches 21-30 are located is left open, closing the reset switch
54 will not reset the relays for when the signal release switch is
released or opened, those relays which were previously placed in
the normally open position will return to that position.
It is also to be noted that the reset switch 54 will not operate to
reset the relays 75 where the key switch 50 is in the burglar alarm
position. This is so because with the key switch 50 in the burglar
alarm position the latching relay 101 is in the alarm position and
the signal on the line 201 can not get through the relay 101 to the
coil 68 of the reset relay 67. Thus, an intruder cannot deactivate
the external signalling device 12 by closing the reset switch
54.
Various changes and modifications may be made within this invention
as will be readily apparent to those skilled in the art. Such
changes and modifications are within the scope and teaching of this
invention as defined by the claims appended hereto.
* * * * *