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Патент USA US2126316

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c. a. C. EGGERS
PROTECTIVE ?SIGNAL? SYSTEM
Filed Dec. 15, 1934
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PROTECTIVE SIGNAL SYSTEM
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?Filed Dec; 15, 1954
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Filed. Dec. 15, 1934
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Clarence
Egg?er's
Patented Aug. 9, 1938
2,126.316
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PROTECTIVE SIGNAL SYSTEM
Clarence C. C. Eggers, Minneapolis, Minn, as
signor of one-half to Calvin E. Holmes, Min
neapclis, Minn.
Application December 15, 1934, Serial No. 757,629
'7 Claims. (Cl. 17'7---369)
My invention relates to protective signal sys
A still further object of the invention resides in
tems and particularly to remotely operated sys
tems for indication at a central station and has
for an object? to provide a system which may be
-' used for the indication of burglaries, rise or fall
in ?temperature, increase or reduction in pres?
?sure or for any of the other uses for which pro
tective systems may be employed.
? An ?object of the invention resides in providing
providing a secondary circuit at the subscriber?s
station similar to said signal circuit at the cen~
tral station for operating said call device.
A feature of the invention resides in providing
asubscriberis operating circuit for closing said
secondary circuit.
An object of the invention resides in disposing
in said subscriber?s operating circuit a protective
a ?system ?which is positive in action and which
device for operating said circuit.
cannot be tampered with in any manner without
Another object of the invention resides in con
necting said subscriber?s operating circuit at one
causing actuation of the system and indication
of the fault.
10
end to a source of electrical energy and at its
~
? A still further object of the invention resides
15 in providing a system in which the particular
locality at Which the variation in condition or
disturbance ?occurs can be indicated at the cen
tral station.
>
Annrobject of the invention resides in providing
20 a? system including a circuit which is adapted to
operatea ?signal if the circuit is grounded, or
opened, 'or?any portion thereof shunted out or
shorted, ?or if any ? combination of shunting,
other end to the ground.
A feature of the invention resides in providing 15
a relay having a coil connected in said subscrib
e1"s operating ?circuit at the grounded side thereof
and having switch ?elements disposed in said sec
ondary circuit.
Another object of the invention resides in pro 20
viding a second potential relay having a coil con
nected in said subscriber?s operating circuit and
having switch elements connected in said sec~
shorting,v grounding or opening any portion of
ondary circuit and in? further providing a re
the circuit is attempted.
An'object. of the invention resides in utilizing
sistance inseries with said protective device and 25
a circuit including a main line running from the
central station? to asubscriber?s station, said main
line being connected at one end to a source of
so electrical energy disposed at the central station
and being grounded at its other end in the central
station.?
'
p
.
'
? A still further object of the invention resides
iirproviding at the central station in said line
and at the grounded side thereof a relay and in
providing at the subscriber?s station a protective
?device adapted to ,open said circuit in the event
that the normal-condition of the circLLit at the
subscriber?s station is} disturbed.
? 'Another object of ?the invention resides in pro
viding at said central station a potential relay in
said circuit and in further providing a resistance
in? series with said protective device and disposed
in close proximity thereto.
An object of the invention resides in providing
at said central station a signal circuit adapted to
be?energized by?elither or both of said relays, said
signal ?circuit having one or more signals therein
for indicating a defect in saidcircuit, tampering
with or intentional operation of the system
through said ?rst ?named circuit.
Another" object of the invenion resides in pro- '
viding a call device in said ?rst named circuit and
in?providing a recording device?in said signal cir
cuit ?adapted to be operated by said call device.
in close proximity thereto.
?
'
A still further object of the invention resides
in utilizing a manually wound spring actuated
call device? and in providing an electrically oper
ated trip device therefor, said trip device includ
ing an electromagnet connected in said sub
scriber?s operating circuit.
An object of the invention resides in the speci
?c construction of said call device.
A feature of the invention resides in providing 35
manually operated switches for closing and
grounding said operating circuits.
An object of the invention resides in the spe
ci?c construction of said switch and in the cir
4:0
cuits' associated therewith.
Other objects of the invention reside in the
novel combination and arrangement of parts
and in the details of construction hereinafter
illustrated and/or described.
45
In?the drawings:
Fig. 1 is a wiring diagram of my invention.
Fig. 2 is a side elevational view of the call de~
vice with the case and base therecf shown in
section.
'
Fig. 3 is a sectional View taken on line 3~3
of Fig. 2.
. ?
Fig. 4 is a sectional view taken on line 4-4 0
Fig. 2.
Fig. 5 is a sectional view taken on line 5-?5 of
Fig. 3.
2
2,126,316
Fig. 6 is an elevational view of the cam key
used with the invenion.
Fig. 7 is a wiring diagram of the portion of the
system associated with the cam key shown in
Fig. 6.
Fig. 8 is an across-the-line wiring diagram of
the system shown in Fig. 1.
'
In designing protective systems it has hereto
fore been customary to provide a protective sys
tem for a single designated purpose as for ex
ample to indicate ?re or burglary or failure of
sprinkler systems or some other single purpose.
The present invention provides a system which
may be used for any and all such purposes and
15 for any other purpose which the subscriber may
desire without additional main lines.
With the
protective systems now in use a protective device
may be rendered inoperative? by competent me
chanics so that the purpose of the system is ob
structed and the system frequently fails to oper
ate at the critical time. The present invention
provides a device which may be used for any
desired purpose and?may be used for several
desired purposes at one time and which cannot be
25 tampered with without causing operation of the
signal.
My invention as shown in Fig. 1, includes a
signal circuit indicated in its entirety by the
reference numeral l9 and an operating circuit
therefor indicated in its entirety by the reference
numeral ||. 'The circuit H includes a main line
l2 having sides I 3 and M which run between a
central station C and a subscriber's station S. At
the subscriber?s station S there are various sub
35 stations a, b; c, d, e, f and g, at which stations
suitable protective devices are installed, for in
dicating at the central station the existence of
certain conditions at the subscriber?s station. At
certain of the above named stations namely sta
40 tions e, f and g, are located call devices l5, l6
and i?! which are adapted to operate a recording
device H3 in the signal circuit I0 and to desig
nate in addition to giving the desired signal the
particular station from which said signal origi
45 nates.
For the purpose of operating these call
devices and to prevent tampering therewith or
with the circuits connected with the same, a
secondary circuit I9 is employed which is similar
to the signal circuit In. This circuit is operated
50 by a subscriber?s operating circuit 2| which is
similar to the operating circuit previously re
ferred to. These various circuits and the appa
ratus connected therein will now be described in
detail.
"
Electrical energy is provided at the central
station for both of the circuits l0 and H by
means of a generator 22 which is connected on
one side through a conductor 23 to the ground.
The other sideis connected through a conductor
60 24 with two variable resistances 25 and 26 ar
ranged in parallel. The generator 22 delivers
a voltage considerably greater than that desired
to be used in the circuits In and H and the re
sistances 25 and 26 are employed to cut down
the voltage to that desired. The signal circuit
It! includes a local line 28 which comprises two
conductors 29 and 3|. Conductor 29 is directly
connected to the resistance 25, being thereby
connected to the potential side of the generator
22. Conductor 3| is directly connected to ground.
In the signal circuit I8 is provided in addition
to the recording device l8 a bell or other resonant
signal 33, an annunciator 34 and a light 35. A
conductor 32 forms part of the circuit I0 and is
75 directly connected to the recording device l8,
Branch conductors 36 and 3?! connect the con
ductor 32 with the bell 33 and the coil 38 of
the annunciator 34. The annunciator 34 is con
structed with a swinging armature 39 which oper
ates a trip lever 4|. A swinging arm 42 is held
in position by means of the trip lever 4|. When
the armature 39 is articulated by the coil 38, arm
42 is released and drops downwardly to a posi
tion shown in dotted lines at 43. This arm forms
part of the signalling circuit l0 and is adapted 10
to engage a contact 44 when in its lowermost posi
tion. The contact 44 is connected through a con
ductor 45 with the lamp 35 while the arm 42 is
connected through a conductor 46 with the con
ductor 29. The other side of the lamp 35 is 15
directly connected to the conductor 3|.
The circuit H1 is normally open, being broken
between the conductors 29 and 32. For the pur
pose of closing this circuit, three relays 41, 48
and 49 are employed which are constructed in 20
the following manner: The relay 4'! is provided
with a coil El and two contacts 52 and 53 adapted
to be connected through a connector 54. Con
nector 54, is operated by a plunger 55 which is
drawn into the coil 5| when the said coil is ener~ 25
sized and serves to connect the contacts 52 and
53 together, thereby forming a switch which I
have indicated in its entirety by the reference
numeral 56. A spring 60 attached to connector
54 holds said switch open. The relay 41 is a 30
potential relay and operates only when the po
tential across the coil 5| is increased beyond a
normal predetermined potential insufficient to
cause the closing of the switch 56. Relay 48 is
constructed with a coil 51 and plunger 58 movable 35
within the same.
Plunger 58 operates a con
nector 59 which is adapted to connect together
two contacts 6| and 62. These contacts and con
nector constitute another switch which I have
indicated in its entirety by the reference nu 40
meral 64-. Coil 48 normally holds the switch
64 open and when said coil is deenergized the
spring 63 draws the connector into engagement
with contacts 6| and 62 and closes said switch.
The relay 49 is identical with relay 48 and com 45
prises a coil 65 and a plunger 66 movable Within
the same. This plunger has attached to it a
connector 68 which is adapted to connect to
gether two contacts 69 and ?H and forms in con
junction therewith a switch indicated in its en 50
tirety by the reference numeral 12. A spring 13
similar to the spring 63 serves to close the switch
?12 when the coil 65 is deenergized. Both of the
relays 48 and 49 are current relays and are adapt
ed to hold the switches 64 and 12 open as long 55
as current flows through the coils 51 and. 65 and
are adapted to close said switches when said coils
are denergized.
.
The contact 52 of relay 4'! is connected through
a conductor 14 with conductor 29 previously re
ferred to. Another conductor 15 connects con
60
tact 53 with conductor 32. Contact 6| of relay
48 is connected through a conductor 16 with
conductor 29 and contact 62 is connected through
a conductor ?IT with conductor 32.
Conductors 65
29 and 32 are directly connected to the contacts
69 and H of relay 49. It will thus be seen that
the three switches 56, 64 and 12 are connected
in parallel across the local line 28 forming part
of the signal circuit l0 and that the operation of 70
any or all of said relays will close the signal cir
cuit and procure operation of the various signal
ling devices contained'in the same.
As previously stated, current for energizing the
operating circuit II is procured from the gener 75
3
2,126,316
ator 22. For this purpose the resistance 26 is
employed which has connected to it a conductor
?II. This conductor is in turn Connected to a
rheostat I02 which is further connected� to? a
conductor Hi3. Conductor I03 feeds the various
relays 41, 48 and 48 and is connected in the cir
cuit II as will be presently described in detail.
For the purpose of testing the control circuit
II two test jacks l8 and 79 are employed. The
10 jack 18 comprises four leaves 8|, 82, 83 and 8d.
The leaves BI and 82 are adapted to contact with
one another and the leaves 33 and 84 are similarly
adapted to contact with one another when the
jack is in normal position. The two outer leaves
15 SI and 84 are formed with extensions 85 and 8%
which are adapted to be connected to a suitable
test plug, not shown, when the same is inserted
in the jack. Jack ?I9 is similarly constructed and
consists of outer leaves 8'! and 88 and inner leaves
20 89 and 9! adapted to contact with the outer
leaves. The outer leaves are constructed with
extensions 92 and as which are adapted to be
. connected to the plug used for the testing of the
circuit. It will be noted that the outer leaves of
25 both of the jacks l8 and T9. are normally con
nected to the inner leaves and that when the outer
leaves are spread apart and the plug inserted into
?the jack, the jack ?i8 is connected in the side Id
of line l2 while the jack ?I9 is connected in side
30 I3 of said line.
The manner of connectingr the jacks in the cir
cuit will now be described. Side it of line I2
is connected to leaf spring ill of jack it while a
conductor 94;? is connected to the other outer leaf
35 84 and to the other end of the coil 55 of relay $55.
The other end of this coil is connected through
a conductor 95 with the ground. The two leaves
82 and 83 of the jack ?it ?are connected together
so that when the jack is in normal position con
40 tinuity of the circuit occurs successively through
the leaves 85, 82, 83 and 8d. The jack 19 is simi
larly connected. Side iii of line it is directly
?connected to the leaf 8i? thereof, while the leaf
8B is connected to a conductor 85. This conductor
45 is in turn connected to the end of coil 5i of relay
41. A branch conductor 9? is connected to the
pressure drops below normal, the diaphram Illil 25
will be drawn inwardly through the ?action of
spring I I4 and switch [I2 will open. This will
cause the operation of the signalling system in a
manner to be presently described in detail.
At stations b and c are located thermostats I I5 30
and till. The thermostat lit consists of a spiral
ill of bi~~metal which is adapted to contact with
a ?xed contact H8. This construction forms a
switch H9 which is normally maintained closed.
Thermostat Elli similarly consists of a spiral of 35
bi-metal Ill which is adapted to engage a con_
tact �2.
This construction provides a switch
I23 which is also, normally closed.
The ther
mostats H5 and H5 may be so constructed that
the switches thereof open when an increase of 40
temperature occurs. In such case the said ther
mostats are used for indicating ?re or any ab
normal rise in temperature such as might be
occasioned in commercial plants where constant
temperature is essential in the manufacture of its 45
goods or products. The thermostats HE and Ill;
may also be constructed so that the switches
thereof open upon an abnormal drop in tempera
ture. Such device may be advantageously used
The other ends of
Id of line it and is directly grounded and that
of the line, being disposed on the potential side
of the line.
As previously stated the line It extends be
tween the central station C and the subscriber?s
station S, the said line being of any desired length
and taking any suitable course necessary to con~
nect the subscriber?s station with the central sta~
tion. The remainder of the apparatus and the
equipment utilized with the invention is situated
at the subscriber?s station and at the various sub-
stations of the subscriber?s station. The portion
of the circuit II at the subscriber?s station con
sists of a number of conductors which are con-e
nected ?to the various protective devices, said
.75
used in conjunction with a sprinkler system.
This switch includes a case Ilia which is provided
?with a chamber Hi5 within the interior thereof.
Case N34 is open at the front and is adapted to 10
be closed by means of a diaphram H36 secured
thereto through a retaining ring it?! and machine
screws I08. Diaphram It'd carries a contact I39
which is adapted to engage a contact ill, said
contacts forming in conjunction a switch indi 15
cated in its entirety by the reference numeral I I2.
The case IM is connected ?to a suitable pipe H3
which communicates with the water supply sys
tem of the sprinkler system. A spring I I4 acting
between the diaphram Itt and case H34 holds
the switch II 2 normally open. The. pipe H3 com
municates with chamber I95 and when the pres
sure within the chamber W5 is normal, switch
H2 is closed. If for. any reason the water
end of coil 5'! of relay lit.
the two coils 5i and lil of relays ill? and (it are
55 connected in parallel and are in the other side 53
m
At station a I have shown a pressure responsive
switch 403 which is particularly adapted to be
conductor 96 and is also connected to the other
these relays are connected to a conductor 98
50 which in turn is connected to the conductor I63
previously referred to. It will thus be seen that
the coil 65 of relay (is is connected in the side
65
it can readily be comprehended that the type of
device disclosed is merely illustrative and that
any type of device may be substituted for that
disclosed.
devices being all arranged in series in said circuit.
At the various sub-stations a, b, c, d, e, f and g,
a protective device has been installed which is
connected in the circuit ll. Inasmuch?as the
system may be used for various purposes, different
types of protective devices have been shown and
for safeguarding against freezing of water in pipes 50
or other systems or for abnormal refrigeration
or abnormal drop in temperature in any system.
At stations 0 and 7? window foil 52d and IE5 has
been illustrated as installed on two windows lift
and Hill. This foil serves in the usual manner to 55
give a signal when the window has been opened
or broken or the circuit in any other manner
tampered with at such locality. The foil IN and
Hill is cemented to the window and forms a direct
part of the circuit.
method of use of the foil 60
1 Hill and E25 is obvious. Said foil may be used in
conjunction with any closure or structure which
is apt to be broken or tampered with. It can
readily be comprehended that a simple window
switch may be substituted in place of the foil 65
shown or may also be used in conjunction with
the foil, if desired.
Where the protective system is to be used in a
bank or similar place of business, it becomes fre
quently desirable to permit the attendants or cm
ployees in the bank to manually operate the sys
tem and give the signal. For this purpose cam
keys I28 and I29 have been shown at stations (I
and 9.
These cam keys will be presently de- .
scribed ?in vdetail,
75
2,126,316
4
With my improved invention the particular lo
cation of origin of the signal may be accurately
indicated at the central station.
This is ac
complished through the various call devices I5,
I6 and I1 which are situated at the desired sub
stations in the subscriber?s station. With my
invention some of the stations may have such call
devices and other stations may be operated with
out the call device, a general alarm being in such
10 case sounded. For the purpose of illustration,
call devices have been shown at stations e, f and
9, though it can readily be comprehended that
the said devices may be placed at any or all of the
other stations shown, if desired. If the call de
15 vices were directly connected to the protective
devices the same might be tampered with and
shorted out so as to prevent the rendering of the
signal. To overcome this disadvantage the cir?
cuits I9 and 2| have been employed in associa
tion with the call devices and the other equip
ment of the invention, which circuits will be
subsequently more fully described.
Inasmuch as both of the cam keys I28 and I29
and are attached to the bar I35 on the opposite
side thereof.
For operating the key, a cam lever I64 is em~
ployed which consists of a plate-like portion I65
arcuate in form which is pivoted between two
cars I66 formed on the connecting portion I34
of frame I 3!. A pin I61 passes jointly through
said ears and plate-like portion and forms a
pintle on which said cam lever swings. A handle
I68 is attached to said cam lever and serves as a
means for manipulating the same. The plate
like portion I65 has attached to it a pin I69
which has mounted on opposite sides thereof
rollers I1I. These rollers are constructed of in
sulating material such as ?ber or any of the
phenol formaldehyde products. One of the rollers
and the method of connecting up the same are
25 identical, only the key I28 will be described in
I1I is adapted to engage cams I12 and I13 formed
on the switch leaves I42 and I53 and the other of
said rollers is adapted to engage similar cams
formed on the switch leaves I58 and I62, as best
shown in Fig. '1. When the cam lever is swung
downwardly as viewed in Fig. 6, roller I1I moves
the cam I12 upwardly breaking the circuit be
tween leaves I42 and I43 and connecting a cir
cuit including leaves MI and I42. When the
detail. The construction of the said key is shown
handle I68 is moved upwardly, roller I1I operates
in Fig. 6, while the wiring diagram for the portion
in the same manner with reference to leaf I 53
of the circuit II associated therewith is shown in
Fig. '1. The key I28 comprises a frame I3I, U
30 shaped in form which is constructed with two
?legs I32 and I33 and a connecting portion I34.
Between the two legs I32 and I33 is mounted a
bar I35 which is riveted or otherwise secured to
the said two legs. This bar carries the various
35 switch elements of the key. The switch elements
of the key are formed through a number of
switch leaves which are arranged in groups.
There are four groups designated at I36, I31, I38
and I39 and the switch leaves in each group are
40 similarly constructed. The two groups I36 and
I31 are disposed on one side of the bar I35 while
the groups I38 and I39 are disposed on the other
side of said bar directly in back of the ?rst
named groups and the leaves thereof are hence
45 not fully visible in Fig. 6. Group I36 includes
three leaves I4I, I42 and I43 of which the inner
leaf I42 is adapted to move between the leaves
MI and I43 and to make contact with either
thereof, depending upon the relative positions
50 of said intermediate leaf. The leaves MI and I43
have contacts I44 and I45 which are adapted to
directly engage the leaf I42. To limit the move"
ment of the leaf I42 a rigid leaf I46 is employed
which is disposed between the leaves I42 and I43.
55 All of these leaves including the strip I46 are
separated from one another through insulating
spacers I41 and. the entire group is held in place
by means of screws I48 which pass through the
said leaves and spacers and are insulated from
60 the leaves through sleeves encircling said screws,
which structure has not been shown in the draw
ings. Screws I 48 screw into a mounting block
I49 which is held attached to the bar I35 on one
side thereof by means of a. screw I5I.
65
The group I31 includes leaf springs I52, I53 and
I54 which are constructed identical with the
leaves of the group I36 and which are similarly
separated through insulated spacers I55.
This
?group of springs is attached by means of screws
70 I56 to the block I49, the same as the group I36
and is disposed on the opposite side of said block.
Group I38 includes leaves I51, I58 and I59 and
group I39 includes leaves I6I, I62 and I63. All
of these leaves are mounted in identically the
75 same manner as. the leaves of the previous group
is
opening the circuit through leaves I52 and I53
and connecting a circuit through leaves I53 and
I54.
At the same time a corresponding opening '
and connecting of the leaves of groups I38 and
I39 occurs, due to the other roller I1I on the
opposite side of the plate-like member I65 of the
cam lever I64.
The various leaves of the cam key I28 are '
connected together as shown in Fig. 7.
A con
ductor I14 connects the leaves MI and I63 to~
gether. A conductor I15 connects the leaves I43
and I59 together. Another conductor I 16 con
nects the leaves I52 and I6I together. A con
ductor I11 connects the leaves I53 and I62 to
gether and a conductor I18 connects the two
leaves I54 and I51 together. The other con
ductors of the cam key are connected in the cir
cuit II as will be subsequently more fully de
scribed.
45
'
The three call devices I5, I6 and I1 being
identical in construction, only the call device I5
will be described in detail which is shown in Figs.
2, 3, 4 and 5. This device comprises a panel I 8I
constructed of insulating material which is
mounted upon a base I82. The plate I8I is
smaller in dimensions than the base I82 which
projects marginally outwardly beyond the same.
Enclosing the entire mechanism is a case I 83 con
55
structed with side walls I84 and I85 and with end
walls I86 and I81. A top I88 is connected to all
of said walls. The lowermost portion of case I83
is open and ?is of such dimensions as to ?t about
the panel I8I. The lowermost edges of the walls
I84, I85, I86 and I81 rest directly upon the
base I82. Case I83 is secured to the base I82 by
means of countersunk machine screws I89 which?
are screwed into angle brackets I 9I attached to '
the walls I84 and I85 of the case proper.
The call device includes an electromagnet I92
which is mounted upon the panel I8I. This
electromagnet consists of two cores I93 and I94
attached to a yoke I95. About the cores I93 and
I94 are wound coils I96 and I91. The electro 70
magnet I32 is attached to the plate I8I by means
of countersunk machine screws I98 which extend
through the panel i8I and are threaded into the
core structure of the electromagnet. The electro
magnet I92 further includes an upright I99 con
>
7
2,126,316
structed with a base portion 20L This base por
tion is attached to the panel .I8I by means of
countersunk machine screws
292
which
are
threaded into said base portion and which extend
l~ through the panel I8I. At the upper end of the
upright I99 is provided a forked bearing 294
which rotatably supports a pintle 295. Secured
to the pintle 295 is an armature 256 formed with
a cross head 299 adapted to be attracted by the
10' tires ends of the cores I93 and I94 of the magnet
I92. A screw 29? is threaded into the armature
206 and engages a member 298 extending out?
wardly from the upright I99. This screw limits
the downward movement of the armature 233
15 -?and prevents the cross head 259 from sticking to
the ends of the cores I93 and I94. Issuing up
wardly?from the member 298?is a bracket 299.
An adjusting screw 2i I is threaded in this bracket
and engages the armature 296 and serves as a
?limit for the upward movement of the same. By
means of this screw the'cross head 299 is pre
vented from moving too far away from the
magnet.
A compression coil spring 2I2 acting
between the armature 295 and the member 238
25 ?urges the said armature away from the cores
I93 and I94 and causes the said armature to
normally assume the position shown in Figs. 3
and 5.
For operating the'call device a clock mecha
30 nism is employed which is indicated in its en
tirety by the reference numeral 2I3. This clock
mechanism comprises two bearing plates 2 I5 and
2I5 which are constructed at their lower ends
with ?anges 2I6 and 2I'I. Countersunk machine
35 screws 2I8 pass throgh the panel MI and are
and gives sufficient time for the operation of the
call device.
The call device includes a switch mechanism
best shown in Figs. 2 and 4. This switch mecha
ism comprises a mounting block 243 which is
constructed of ?ber or some other similar in
sulating material. The mounting block 243 is
secured to bearing plate M5 by means of ma
chine screws 244 which extend through the said
block and are threaded into said bearing plate. 10
Attached to the mounting block 243 are two
switch leaves 245 and 243 constructed of spring
material which are formed at their ends with
ears 241 bent outwardly therefrom.
Rigidly
secured to the arbor 234 is a hub 248 which has 15
attached to it two disks 25I and 252. The disk
25f is constructed with a certain number of
notches 253 which are spaced in a predetermined
manner. The ear 241 of switch spring 246 is
adapted to engage the peripheral surface of the
disk 25I and operates to close the circuit when
in contact therewith.
When said ear comes op
posite the notches 253 the circuit through said
switch leaf is opened. The disk 252 is smaller
in diameter than the disk 25i and is constructed
at intervals about its periphery with outwardly
projecting lugs 254. These lugs are adapted to be
engaged by the ear 241 of the leaf spring 245.
When the lug 254 is engaged with the leaf spring
245 the circuit through the said leaf spring is 3O
grounded. When, however, the car 241 of said
spring is intermediate the lugs 254 the circuit
through the said leaf spring is opened. The lugs
254 correspond in number and position with the
notches 253and when the two switch leaves 245
threaded into the said ?anges. Spacer sleeves
2I9 are disposed between the bearing plates 2M
and 246 are in the same plane and the ears 247
thereof at the same location the said lugs regis- '
and 2I5 and machine screws 22I pass jointly
ter with the notches; As the arbor 234 rotates
through said plates and sleeves and hold the
40 plates assembled in spaced parallel relation.
Journaled in the two plates. 2 I4 and 2I5 is a main
arbor 222 which projects beyond the plate M4
and has attached to it one end of? a spiral spring
223. The other end of this spring is attached
?to a post 224 secured to the plate 2M. The other
end 225 of arbor 222 projects outwardly through
an opening 226 in the wall I85 of case I83 and
has attached to it a ?nger plate 22'! by means
?of which the arbor 222 may be rotated. Between
50 ? the two plates 2M and H5 is rotatably mounted
on the arbor 222 a gear wheel 229. ~ This gear
wheel has attached to it a pawl 229 (Fig. 5) which
is adapted to engage a ratchet 23I rigidly secured
to arbor 222. A 0 spring 232 attached at one end
?to gear wheel 228 engages at its other end the
pawl 229 and holds the same into engagement
with the ratchet 23I. The gear wheel 228 meshes
with a gear pinion 233 fast on another arbor 234.
This arbor is similarly journaled in the two bear
coil uing plates 2I4 and 2H5. Arbor 234 has attached
to it a gear wheel 235 which in turn meshes with
another gear pinion 236. Pinion 233 is fast on an
arbor 231 which similarly is journaled in the
two bearing plates 2I4 and 2I5. Arbor 231 has
secured to it an escape wheel 238 which cooper
ates with an escapement 239 mounted on an
arbor 24L This arbor is also journaled in the
bearing plates 224- and 2H5. When the spring
223 is wound up rotary movement is imparted
through the gear train to the escape wheel 238
which imparts an oscillatory movement to arbor
24I. Attached to the arbor 24H is a weight 242
which times the oscillation of the arbor 24 I. This
icontrols the time taken for the spring to unwind
circuits are successively opened and grounded
operating in a manner to cause the recording 40
device I8 to function and thereby make a record
in the recording device which indicates the par
ticular station at which the call device originated.
The arbor 222 is held from movement by means
of a latching device best shown in Figs. 2 and 3.
The armature 296 of the electromagnet I92 has
attached to it an upright 255, which is provided
at its outer end with a latch lug 253. This lug
is adapted to engage a ?nger 25'! formed on an
arm 258. Arm 258 is secured to the arbor 222. 50
When the parts are in normal position the finger
251 rests upon the latch lug 256 as shown in Fig.
3. When the armature 295 of the electromagnet
is attracted by the core of the same, the arm
255 is swung toward the left as viewed in Fig. 3 55
and thelatch lug 256 is disengaged from the
?nger 25f. Arbor 222 then commences to rotate,
at the same time rotating arbor 234 and the two
disks 25! and 252 attached thereto in the direc
tion indicated by the arrow in Fig. 2. This suc 60
cessively makes and breaks the respective cir
cuits controlled by said disks.
After the arbor 234 has made a complete revo
lution a pin 259 fast on disk 25I' engages an
arcuate surface 25I on the arm 258 which termi
nates the movement of the clock mechanism and
said arbor 234.
When this occurs the arrange
ment of the contacts ?is such that the circuit
through the spring leaf 245 is closed and that
through the springmleaf 245 is opened.? The device 70
can be manually reset by rotating the finger piece
221 in a clockwise direction as viewed in Figs. 2
and 5. To limit such movement a stop 262 is
employed which is attached to the arm 258 and
which engages- the surface of the disk 25L
6
2,126,316
The manner of connecting up the various pro
tective devices of the invention at the subscriber's
station will now be described in detail. The side
ductor 98, both of the coils 5| and 51 of relays 41
and 48, conductors 91 and 96 and up to the jack
19. Current enters the switch leaf 88 of said
I3 of the line I2 is directly connected to contact
III of? the pressure responsive switch 403. The
other contact I09 of said switch is connected to a
jack and flows successively through switch leaves
9|, 89 and 81, leaving the said jack by means of
the side I3 of the main line I2 which is connected
thereto. Current further flows through the main
resistance 263 by means of a conductor 264. The
resistance 263 is located in close proximity to said
pressure switch or may be made a part thereof by
10 housing the same in some portion of case I84 of
said pressure switch so that it becomes impossible
to tamper therewith. Resistance 263 is connected
by means of a conductor 264 with the contact I I8
of thermostat I I 5. The spiral I I1 of this thermo
stat is connected by means of a conductor 265 with
another resistance 266 which is disposed in close
proximity to the thermostat the same as the
resistance 263. The resistance 266 is connected
by means of a conductor 261 to a similar resist
20 ance 268 used in conjunction with the call device
This resistance is connected by a conductor
269 to the frame of the said call device, said
frame being in turn directly connected to the two
disks 25I and 252. The switch leaf 245 of call
device I5 is connected to ground by a conductor
21I while the switch leaf- 246 is connected by
means of a conductor 212 to one end of the foil
I24. The other end of the foil is connected by a
conductor 213 to a resistance 214. This resist
ance and the resistancew268 are associated with
the call device I5 and the foil I24 in identically
the same manner as the resistances 266 and 263
previously referred to.
A conductor 215 runs
between the resistance 214 and another resistance
216. This resistance is in turn connected by
means of a conductor 211 to the frame of the call
device I6.
A conductor 218 extends between the
switch leaf 246 of call device I6 and the switch
leaf I58 of cam key I28 as shown in Fig. '7.
Switch leaf 245 of call device I6 is grounded
through a conductor 216. The conductor I18 of
cam key I28 is grounded through another con
ductor 219. Switch leaf I42 of this cam key as
shown in Fig. 7 is connected by means of a con?
ductor 28I to a resistance 282. This resistance is
in turn connected by means of a conductor 283 to
a similar resistance 284. Resistance 284 is con
nected by means of a conductor 285 with the
frame of the call device I1. The side I4 of the
main line I2 is directly connected to the switch
leaf 246 of said call device, while the leaf 245 of
said call device is grounded through conductor
260. It will thus be seen that the protective
devices are all connected in series in the operating
circuit II and function as a plurality of switches,
each capable of opening said circuit upon actua
tion thereof and certain of said switches ground
ing the circuit upon actuation. The switch 493
opens the circuit when changes in pressure occur.
Thermostat I I5 opens the circuit when changes in
temperature occur. Window foil I24 opens the
circuit in case the window is tampered with or
broken and the cam key I28 opens and grounds
the circuit when the circuit is desired to be manu
65 ally opened.
The three call devices I5, I6 and I1
each functions to open and ground the circuit a
successive predetermined number of times when
the trip holding the. clock mechanism thereof
inactive is released.
?
The circuit I I isa normally closed circuit, being
energized from the generator 22, which circuit
includes the line I2. The circuit II may be
traced as follows: Commencing at generator 22
line and up to the pressure switch 483. From the
pressure switch the current ?ows through the
conductor 264, resistance 263, conductor 264, 10
thermostat I I5, conductor 265, resistance 266 and
conductor 261 up to the call device I 5. At the
call device the current continues through resist
ance 268, conductor 269 and to disk 25I of said call
device.
The current continues from the said disk 15
through the switch leaf 246, conductor 212 and
through the foil I24. ' Current leaves the foil
through conductor 213, flows through resistance
214 and conductor 215 up to the call device I6.
Current then ?ows through said call device the 20
same as the call device I5 and from the said call
device to the cam key I28 through conductor 218.
Current continues from the cam key I28, flows
through conductor 283 and the call device I1 and
back to the side I4 of the line I2. From the line 25
I2 the-current ?ows through the test jack 18
through conductor 94, coil 65 of relay 49 and con
ductor 95 to ground, the generator 22 being
grounded through conductor 23 completes the
circuit. When any of the switches constituting
the protective device of the invention are opened
or if the line is broken at any locality both of the
relays 48 and 49 are deenergized and the springs
63 and 13 move the connectors 59 and 68 of said
relays into engagement with the corresponding
contact. This closes the switches 64 and 12 and
closes the circuit I9. This circuit may be traced
as follows: Commencing at generator 22 current
?ows through said circuit from the conductor 24
through the resistance 25 and the conductor 29. 40
Current further flows through the various switch
es 64 and 12 to the conductor 32. From this con
ductor the current divides and passes through the
recording device I3, bell 33 and annunciator 34.
These devices are all grounded and the generator 45
22 being also grounded completes the circuit.
The separate circuit including conductors 46, 45
and 3| and the lamp 35 energize said lamp when
the arm 42 of the annunciator 34 drops and con
tacts with the contact 44. The light 35 when once 50
actuated continues to operate until manually dis
connected which is accomplished by resetting the
annunciator. When the circuit is opened or
grounded by actuation of one of the call devices
I5, I6 or I1, the recording device I8 records the 55
signal given by said call device and indicates the
particular substation from which the call is re
ceived. The recording device I8 may be of any
desired construction.
This particular device
forming no feature of the invention has not been 60
described though it can readily be comprehended
that any suitable construction such as is now well
known in the art and used for similar purposes
may be employed.
In the event that the circuit II is grounded at 65
any locality outside of the central station C the
coil 65 of relay 49 is shunted out and deprived of
electric energy. When this coil becomes deener
gized in this manner switch 12 is closed and the
circuit I0 closed and the signals operated as
previously described.
To make it impossible to shunt out any of the
protective switches or the protective device used
in the operating circuit I I, the various resistances
current flows through conductor 24, resistance 26,
75 conductor IIH, rheostat I62, conductor I63, con 263, 266, 268, 214 etc. which are disposed ad
75
2,126,316
jacent the respective protective device are em
ployed. The circuit II is so balanced through
the rheostat that the potential? relay Ill maintains
the switch 56 open.
The said relays and the said
I resistances ?are so designed that if one of these
resistances is shunted out the potential across
the coil SI? of relay d'I is sufliciently increased
to cause the actuation of said relay. This closes
switch 5'6 and the signal circuit I3 is energized
which causes operation of? the various signals in
the said circuit as previously described. If the
line I2 should become shorted at any location or
if any portion of the circuit H becomes shorted,
the same will operate to shunt out one or more of
15 the resistancesv 263, 266 etc.
This will have the
same effect as shunting out-the single resistance
and will cause operation of relay 4? which ener
gizes the signal circuit and operates the signals
therein.
20
?
My invention is adapted to function if any pos
? sible combination of ground, short or open oo
curs.
When the circuit II is opened at any lo
cality either through the switches or being broken
both relays 42 and 39 are operated which ener
gizes the circuit I9. If a short occurs relay till
alone is operated. If a ground occurs both relays
M and 98 are operated. The same is true if
both an open and'a ground ?occur. If a short and
an open occur relay 9? alone is operated and if a
short and a ground occur both relays it? and 49
are operated. It will thus be seen that no mat
ter what method of tampering with the system
is employed an indication will be given at the
central
station.
Furthermore
the ? particular
35 sub-station at which the signal is given will be
indicated on the recording device when the cir
cuit is opened or tampered with at such sub
station.
The window foil I25 operates the call device
40 I6. Inasmuch as the call device cannot be in~
stalled directly on the window, it becomes neces
sary to run wires from the foil to the said call
device.
If an ordinary circuit were used for
such purpose it would be possible to shunt out the
45.. foil and open the Window without actuating the
signalling system. To prevent this the secondary
circuit I9 is employed which directly operates
the call device.
This circuit is actuated by the
circuit 2i. These two circuits are similar in
50 operation to the circuits I9 and II and are pro
device It and is actuated by foil I25 while the
circuit 2 lg? serves the call device I?! and is actu
ated by cam key I29. Inasmuch as all of these
circuits are identical in all respects and in the
operation thereof, only the circuit 2 If will be de
scribed in detail.
In the circuit 2| j are provided three relays 29I,
292 and 293 which are identical with the relays
3'1, 38 and 99. The relay 29I comprises a coil
294 and two contacts 295 and 296 adapted to be 10
connected together through a. connector 2971
operated by a plunger 298 movable within the coil
292.
These contacts
and
connector form
a
switch indicated by the reference numeral 289.
A spring 339 holds the switch 289 open. Relay 15
295 is a potential relay the same as the relay
9'3.
Relay 292 comprises a coil 299, two contacts
235 and .392 and a connector 394 operated by a
plunger 395 movable within the coil 299. This
connector and contacts constitute the switch in 20
dicated in its entirety by the reference numeral
299.
A spring 390 serves to close the said switch
when the relay is deenergized. Relay 293 simi
larly comprises a coil 396, two contacts 391 and
399 and a connector 399 adapted to be operated 25
by a plunger 3? movable within the coil 396.
Said connector and contacts form a switch indi
cated in its entirety by the reference numeral
3I9. A. spring 329 closes the switch 3H] when
relay 293 is deenergized.
30
The various relays 29I, 292 and 293 are con
nected in the circuits 2| and I9 in the following
manner: The circuit 2|)? includes a conductor
3I2 which is connected to the line 288 and to a
rheostat 3 I 3. Rheostat 3 I 3 is connected by means
of a conductor 3% with the coils 294 and 299 of
relays 29I and 292. These-coils are further con
nected together by means of a conductor 3! 5
which in turn is connected to a conductor 3I6.
Conductor 359 is connected to one end of the foil 40
I25.
The other end of the foil is connected by
means of a conductor 3| ?I to a resistance 3I8.
Resistance 3I8 is connected by means of a con
ductor M9 to one end of the coil 396 of relay 293.
The other end of said relay is connected by a 45
conductor 32I to- ground. It will thus be found
that the two coils of the relays 29I and 292 are
connected in parallel and in series with the foil
I25 and the coil of the relay 293, the said circuit
receiving energy from battery 293 through the
vided with similar protective devices by means
of which it becomes impossible to tamper with the
resistance 236. The circuit 2! f is a normally
closed circuit and when closed maintains the
foil or to short out the same and through which
three switches 289, 299 and 3H} open. The rheo
actuation of the signals is made equally as posi- ' stat M3 is adjusted so that if the resistance 3I8
55 tive as when the switch 493 or the thermostat I I5
is shorted out,'the potential across the coil 294' 55
is operated. This is accomplished in the fol
lowing manner:
'
For energizing the circuits I9 and 2! a battery
283?is employed which is connected at one end
60 .to. ground by a conductor 284. This battery is
connected by another conductor 285 to two re
sistances .296 and 28?.? These resistances serve
the same function as the resistances 25 and 26
and operate to control the voltage in the circuits
65, I9 and 2 I. To the resistance 286 is connected a?
subscriber?s operating line 288 which furnishes
?current to the circuit 2I. An auxiliary line289
is connected to the resistance 23'! and serves to
furnish current to the circuit I9.
70p The circuit 2| is divided into three parallel
branch circuits 2Ie, 2| 1? and 2 lg, there being one
such circuit for each of the call devices used with
the system. In the particular instance the cir
cuit 2Ie serves the call device I5, and is actuated
75 by the thermostat IIIS, circuit 2If serves the call
increases su?iciently to actuate the relay 29I
which closes the switch 299.
The line circuit I9 as previously stated includes
the auxiliary line 289. This line is connected by
means of conductors 322, 323 and 324 to the con?
tacts 295, 3M and 301 of switches 239, 299 and
959 respectively. The other contacts 296, 302 and
393 of said switch are connected by conductors
325, 326 and 321 to a common conductor 328
which in turn is connected to the electromagnet 65
I92 of call device I9. The other side of this
electromagnet is connected by a conductor 329
to ground. It will hence be seen that when any
of the three switches 289, 293 and 3I9 are closed
that a circuit is completed from the battery 283 70
through the electrcmagnet 592 of said call device
to the ground. This circuit actuates the call de
vice which in turn operates the signal circuit
and at the same time causes the recording device
I8 to function. In order to render the call de 75
8
2,126,316
vice I5 absolutely positive the disk 252 and switch
sible to tamper with the system without causing
leaf 245 are employed. While the circuit is held
open through the disk 25I and switch leaf 246 the
and any failure whatsoever in the system will be
same is being grounded through the other disk
and switch leaf.
This causes an alternate oper
ation of the circuit through the relays 49 and 41
which procures positive energization of the cir
cuit Ill.
The relays 29L 292 and 293 and the call de
10 vice I6 may be conveniently placed within a sin
gle case and the said case locked so that access
thereto is prevented. All of the wire of the cir
cuit I9 may hence be concealed and only the
wiring of circuit 2| exposed.
Any tampering
with the circuit 2! will cause actuation of the
circuit I9 the same as described in conjunction
with the circuits I0 and II. Actuation of cir
cuit I9 procures the corresponding actuation of
circuits II and I0 and the rendering of the
signal.
My invention operates in the following man
ner: If the pressure switch 403 is opened or if the
30 thermostat I I5 is opened circuit I I is opened and
relays 48 and 49 are deprived of energy and the
switches 64 and 12 close energizing circuit ID.
This operates the various signals 33, 34 and 35.
The same is true if the foil I24 is broken. If the
switch I28 is operated manually by swinging the
handle I68 in either direction the circuit is ?rst
opened and then grounded. This causes the
operation of ?rst both relays 48 and 49 and then
relays 4'! and 49, making the actuation of the
various signals absolutely positive. If an at
tempt is made to shunt out any of the resistances
266, 214, 282 or'284, potential relay 4'! is
caused to operate which again energizes circuit
I9 and operates the signals. If an attempt is
45 made to ground the circuit at any locality in the
subscriber?s station S both relays 41 and 49 op
erate and the signal is given. If the line is both
open and grounded then relay 49 alone operates.
It will hence become apparent that it is prac
tically impossible to tamper with the system
without procuring an indication at the central
station. If the window foil I25 be broken or if
the resistance 3I8 be shunted out or if the cir
cuit 2!)? be shorted or grounded, the three relays
29!, 292 and 293 act in identically the same
manner as the relays 41, 48 and 49 and procure
cnergization of the circuit I9. This has the ef
fect of operating the call device I6. Call device
It? successively opens and grounds the circuit II
60 thereby procuring actuation of the various sig
nals in the central station. >Atythe same time the
call device operates the recording device I8 which
advises the attendant of the particular location
from which the call originates. The same is true
in the event the thermostat II 6 is operated or
the cam key I29, the said results being procured
through the circuits ?Me and 2Ig and circuit I9
in identically the same manner as described in
conjunction with the'window foil I25, and its
associated circuits.
manifest by the operation of the signals. The
system may be periodically tested to determine
leakage in the circuits. The number of units in
the system may be increased or reduced at any
time and by means of the variable resistances
and rheostats employed the circuit is balanced
for such change of conditions. The system is 10
easy to install and can be used with any type
of building or similar structure. Any combina
tion of the services desired may be readily pro
cured. This system can be maintained at a
moderate expense.
15
Changes in the speci?c form of my invention,
as herein disclosed, may be made within the scope
of what is claimed without departing from the
spirit of my invention.
Having described my invention, what I claim 20
The circuits Zle and My are connected with
the thermostat H5 and the cam key I29 re
spectively. Inasmuch as these circuits are iden
tical with the circuit 2| ,1? and the manner of con
necting the same is identical with that previous
ly described, the said circuits will not be described
in detail.
70
a signal. The invention will operate indefinitely
'
'
My invention is highly advantageous in that
a comparatively simple and practical system
is provided by means of which any desired kind
of protection may be rendered. By means of the
75 circuits employed it becomes practically impos
as new and desire to protect by Letters Patent is:
1. In a protective signal system, a normally
closed operating circuit, a source of electrical en
ergy in said circuit, a normally energized poten
tial relay having a'winding in said circuit, said 25
relay being adapted to be actuated upon the po
tential reaching a predetermined value, a protec
tive device in said circuit, a resistance in said
circuit in series with said protective device and
positioned in close proximity thereto, an adjust
able resistance in said circuit positioned at the
locality of said relay, means for adjusting said
resistance to prevent normal actuation of the re
lay when both of the resistances are in series
in the circuit, and a signal operated by said 35
relay.
2. In a protective signal system for remote sig
nalling, a normally closed operating circuit in
cluding a line running between a central station
and a subscriber?s station and having a loop dis 40
posed within said subscriber?s station, a source of
electrical energy at the central station grounded
on one side and connected on the other side to
one side of the line, the other side of the line
being grounded in the central station, a relay at 45
said central station having a signalling switch
and a coil, said coil being connected in said op
erating circuit, a signal circuit at said central
station, said signalling switch of said relay be
ing connected in said signal circuit, a signalling 50
device in said signal circuit, a recording device in
said signal circuit, a call device at said subscrib
er?s station having a coil and a code switch, said
code switch being connected in the loop of said
operating circuit and being adapted to operate _
said recording device through said relay, a nor
mally closed subscriber?s operating circuit at said
subscriber?s station having a run connected at
one end to a grounded source of electrical energy
and at its other end to a ground, a relay at said 60
subscriber?s station having a coil and a switch,
said coil being connected in said subscriber?s op
erating circuit near said ground, a secondary cir
cuit at said subscriber?s station, the switch of
said second named relay being connected in said
secondary circuit, said coil of said call device be
ing connected in said secondary circuit, and a
protective switch in said subscriber?s operating
circuit.
3. In a protective signal system for remote
signalling, a normally closed operating circuit in
eluding a line running between a central station
and a subscriber?s station and having a loop dis
posed within said subscriber?s station, a source of
electrical energy at the central station grounded
2,126,316
� 9
on one side and connected on the other side to
thereto, a signal circuit in said central station,
one side of the line,. the other side of the line
being grounded in the central station, a relay at
said central station having a signalling switch
and a coil, said coil being connected in said op
erating circuit, a signal circuit at said central
both of said switches being connected in said sig
nal circuit and signalling means in said signal
circuit operated by either of said relays.
5. In a protective signal system, a normally
station, said signalling switch of said relay being
connected in said signal circuit, a signalling de
vice in said signal circuit, a recording device in
said signal circuit, a call device at said sub
scriber?s station having a coil and a code switch,
said code switch? being connected in the loop of
said operating circuit and being adapted to op
erate said recording device through said relay,
15 a normally closed subscriber?s operating circuit
at said subscriber?s station having a run con
nected at one end to a grounded source of e1ec~
trical energy and at its other end to a ground,
a relay at said subscriber?s station having a coil
20 and a switch, said coil being connected in said
subscriber?s operating circuit near said ground, a
secondary circuit at said subscriber's station, the
switch of said second named relay being con
nected in said secondary circuit, said coil of said
25 call device being connected in said secondary cir
cuit, a potential relay at said subscriber?s station
having a coil and a switch, said potential relay
coil being connected in said subscriber?s operat
ing circuit, and said potential relay switch being
30 connected in said secondary circuit, a protective
switch in said subscriber?s operating circuit, and
a resistance in said subscriber?s operating cir
cuit in series with said protective switch and
in close proximity thereto.
4. In a protective signal system for remote sig
35
nalling, a normally closed operating circuit in
cluding a line running between a central station
and a subscriber?s station and having a loop dis
posed within said subscriber?s station, a source
40 of electrical energy at the central station
grounded on one side and connected on the
other side to one side of the line, the other side
of said line being grounded in the central station,
a relay at said central station having a signalling
switch and a coil, said coil being connected in
said operating circuit, a potential relay at said
central station having a signalling switch and a
coil, the coil thereof being connected in said op
erating circuit, a protective device at said sub
50 scriber?s station in said loop, a resistance in series
with said protective device and in close proximity
closed operating circuit including a main line
connected at one side to a ground, a grounded
source of electrical energy, connected to the other
side of the line, a normally energized relay hav
ing a coil connected in said circuit in proximity
to saidiground, a switch mechanism in said cir
cuit, said switch mechanism including a pair of
normally closed switch elements, and a pair of
normally open switch elements, one thereof be
ing grounded, said mechanism being adapted
upon actuation to ?rst open said ?rst named
switch elements and to thereafter close said sec
ond named switch elements to ?rst open and
then ground said circuit, and a signal operated
by said relay.
20
6. In a protective signal system, a normally
closed operating circuit including a main line
connected at one side to a ground, a grounded '
source of electrical energy connected to the other
side of the line, a normally energized relay hav 25
ing a coil connected in said circuit in proximity
to said ground, a call device,� said call device hav
ing a switch mechanism in said circuit adapted
to successively open and ground said circuit, ac
tuating means for said switch mechanism, a trip
including a soil for releasing said? actuating
means, a secondary circuit including the coil of
said trip for ?operating said trip, a normally closed
subscriber?s operating circuit for energizing said
secondary circuit, and a protective device in said
last named circuit.
?7. In a protective signal system, a normally ?
closed operating circuit, said circuit having a run
grounded at both ends, a protective device in said
circuit, a relay in said circuit between one of 40
said grounds and said protective device, said
protective device including two switches, one of
said switches being normally closed and opening
said circuit upon actuation, the other of said
switches being normaly open and having a switch 45
element connected to said circuit, and a circuit
connected to the other of said switch elements
and to a ground in proximity to said protective
device, and means for simultaneously operating
said switches.
?
'
CLARENCE C. C?. EGGERS.
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