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Патент USA US2114324

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April 19, 1938.
Filed Feb. 14, 1933
3 Sheets-Shea?l l
April 19, 193s.
Filed Feb. 14, .1933>
.Sacca :s ive
Non-Inh: rfèrenee
3 Sheets-Sheet 2
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April 19, 1938.
Patented Apr. 19, 1938
' UNITED srA'rss
sueur orrics
Foster E. Weld, Newton, Mass., assignor-to The
Gamewcll Company, Newton, Mass., a corpora
tion of Massachusetts
Application February 14, 1933, Serial No. 656,664
9 Claims.
The present invention relates to signaling sys
tems, and more particularly to installations with
several outer signal initiating circuits associated
with one another, and with signal manifesting
5 devices at a receiving station, by means of re
peaters, which automatically organize the desired
` reception and manifestation of the signals orig
inating in the outer circuits, each of which may
comprise a group o-f individual signal despatch
10- ing stations. Such installations are used for
many purposes but mainly in ñre alarm systems
with normally closed outer signal circuits or loops
constantly carrying current, each loop comp-ris
ing in series connection several so-called alarm
15 boxes and also signal manifesting devices such as
gongs and the like. Such systems must be neces
sarily as reliable and independent of supervision
as possible, and it is for this reason desirable
that the appliances involved be few, simple and
rugged. -However the repeaters are especially
likely to be rather involved, cumbersome, and
therefore expensive, and also unreliable because
of their very complexity. It is therefore the main
object of the present invention to provide a sig
naling system of the type referred to which is
comparatively simple and inexpensive but> never
theless able securely and reliably to perform all
functions legitimately required from such instal
In its broader aspect the present invention pro
poses the interposition between a number of
outer signaling circuits and a central reception
circuit of selecting instrumentalities, .for example,
of the type commonly used in automatic tele
C13 5 phone installations, which upon abnormal con
ditioning of any one outer circuit, associate the
reception circuit with consecutive outer circuits,
quickly passing from one normal circuit to the
next, but being stopped for operative association
lo between the reception, circuit and an abnormally
conditioned outer circuit. This arrangement
permits of various embodiments and elabora
tions, several of which are herein shown and
In one modification the invention proposes ar
rangements for excluding accidentally faulty sig
nal circuits from operative association with the
signal reception devices, with the object of pro
viding an installation always properly responsive
50 to signal circuits which are in good working con
dition, while preventing faulty circuits from in
terfering with the orderly reception of signals
from sound circuits, this embodiment being par
ticularly suited for central stations which are not
55 constantly supervised,
(Cl. 177-354)
In another embodiment the invention employs
instrumentalities for'preventing the unseparated
consecutive reception of signal portions originat
ing in different signal circuits, with the object of
avoiding the misinterpretation of signals.
In still another variation the invention pro
poses the use of apparatus for quickly stopping
the loop selecting means and for maintaining it
stopped under certain conditions, with the object
of providing an installation which securely estab- >10
lishes association between alarm and signal cir-
cuit, and which renders the repeater unrespon
sive in case of an accidentally defective signal
It is one of the features of the invention to l5
permit its use in so-called reflex circuit installa
tions, that is, in circuits where signals originating
in a certain outer signal circuit are not only re
ceived and repeated at the central station and in
special manifesting or alarm circuits, but also 20
“reflexed” into other outer signal circuits, ex
cluding the circuit in which the signals originate.
Such “reiiexing” into other signal circuits may be
desirable either for the purpose of providing for
successive formulation of signals in two separate 25
circuits when boxes of the so-called “succession”
type in the respective circuits are concurrently
started, or for the purpose of actuating signal
manifesting devices such as gongs or registers
in such circuits. It is therefore a further object 30
of the invention to provide a signaling system of
the type referred to, with several signal formu
lating circuits, the signals of each of which can
be repeated in the other similar circuits, and to
provide means for preventing the repeating de- 35
vice from influencing the originating circuit with
its own signals, which would cause garbling of
Also the invention contemplates the use, in sys
tems of the type dealt with herein, of peculiar 40
alternating current responsive devices producing
unidirectional current, with the object of con
trolling, with alternating current supplied signal
loops, receiving and repeating apparatus. oper- 45
ative with direct current, and with the further
object of supplying outer signal circuits as Well
as direct current operative signal responsive de
vices With electric energy derived from a source
of alternating current.
These and other aspects and objects will be
apparent from the following detailed explanation
illustrating the genus ofthe invention with ref
erence to several concrete embodimentsthereof.
The description refers to drawings, in which:
Fig. 1 is a connection diagram of a signaling
system according to the present invention;
Fig. 2 is a similar diagram incorporating in
strumentalities for disconnecting faulty signal
Fig. 3 is a detail of the register incorporated in
this circuit;
Figs. 4, 5 and 6 are details illustrating the oper
ation of the register;
Fig. 7 is a connection diagram similar to Fig. 1
but with cut-olf and actuating relays, and illus
trating the adaptation of the invention to a re
flex repeater circuit;
Fig. 8 is a diagram of a system similar in prin
15 ciple to those shown in the other figures, but
touches the ñrst line contact | with one of
these two sliding contacts after the other slid
ing contact has left the last line contact.
The register M is of the so-called open circuit
type, -as for example described in connection
with Fig. 14 of Patent No. 1,602,065 of October
5, 1926 to C. El. Beach. As at length described
in that patent, a register comprising relay mech
anism of this type has a paper feed mechanism
(not shown) which is automatically started
when magnet 3|3 is energized and continues to
run a certain period of time, usually somewhat
longer than the longest interval between the
impulses of any signal, following each energiza
tion of the magnet 3|3, as will be apparent from
adapted for operation with alternating current;
the following explanation of the operation of
Fig. 9 is a detail of the alternating current
arrangement of Fig. 8.
Fig. 1 shows a comparatively simple embodi
ment of the invention which is well adapted
to illustrate the principle of the invention. In
this figure, L denotes a signal circuit or loop
with a group of signal formulating stations N,
this circuit. A pivoted member 3| | of insulat
ing material, associated with the feed mech
anism, is moved- quickly in one direction by a
herein referred to as alarm boxes, a current
source indicated as a battery I0, and the loop
switch (contact |95 having a follower cooperat
ing with a notch of member 3| l), open imme
diately upon energization of the magnet and
are reclosed just prior to termination of the
magnet || of a signal responsive device or line
relay E connected at the central station to the
incoming leads |||, ||2 of the loop L.
30 suitable number of loops may be employed in
order to provide the area served by the signal
ing system with a sufficient number of boxes,
two additional loops L’ and L" with loop mag
nets I2 and i3 being shown in Fig. 1. Accord
35 ing to the practice common in fire alarm sys
tems, the embodiments of the invention herein
described have normally closed loops, signals
being formed by interrupting the loop circuits
by suitable coding means. However, normally
40 open loops in which signals are formed by clos
ing the loop circuits could be used with this in
Each line relay El includes a loop magnet |I,
already referred to and controlling an armature
constituting a movable switch member 24, a
selector contact 2|, and a magnet contact 25.
Since the loops are normally closed and the
loop magnets Il therefore normally energized,
spring 3|2 whenever it is released due to ener
gization of magnet 3| 3, whereupon it is slowly
restored to normal position by the feed train.
The register is so arranged that normally
closed contacts |95 and |99 of the register
run of the paper feed train.
It is understood
that relay M must not necessarily comprise a 30
paper feed train and devices for recording signals
on a tape, but that any apparatus for operating
a switch in the above described manner can be
The reception circuit A comprises reception 35
circuit conductors 45 and 46 connected to wiper
lead 36 and station battery B, respectively, and
signal repeating devices such as tape recorders,
goings, or any other suitable recording, acoustic,
or optic signal manifesting means, which are in
dicated at 50.
As shown in Fig. 1, the line selector contacts
2|, 22, 23, etc. of line relays E are connected
with line contacts I, 2, 3, etc., respectively, of the
selector relays, by means of conductors 4|, 42, 43,
3| are connected intermediate bus 9 and register
contact |96 through conductors 31 and 38, re
member 24 is normally in attracted position,
leaving contacts 25 and 2| open. The central
station has a bus 8 electrically joining all switch
members 24, and a bus 9 similarly joining all
magnet contacts 25. The station has also a
current source, herein indicated as a battery
B, and, in addition to the line relays E, a selector
spectively, whereas
switch is joined to
ister magnet 3|3 is
circuit conductors
and 49.
relay S, a register M, and reception circuit A.
The selector relay S is of the type commonly
used as preselector in automatic telephone in
loop L, due to signals being despatched from an
stallations and may have any suitable conven
60 tional design. The selector herein indicated
comprises a stepper magnet 30 with a vibrator
arm 3|, a vibrator contact 32 normally making
connection with the arm 3| (the contacts be
ing bridged by a circuit suitable to suppress
sparking), in series with the magnet, a number
of line contacts l, 2, 3, etc., one line contact
being provided for each loop, and a wiper 35
which is in well known manner mechanically
or otherwise controlled by armature 3| so that
70 it moves over the line contacts step by step
so long as magnet 30 remains energized, there
Stepper magnet 30 and vibrator contact
contact |95 of the register
battery B by lead 39. Regconnected between reception
45 and. 46. with leads 48
This circuit operates as follows: Upon inter
ruption of any one of the loops, for example i
alarm box, or perhaps due to an accidental
break, magnet || of the loop becomes deen
ergized and drops switch member 24, thereby
connecting bus 8 and battery B with magnet 60
contacts 25 and the respective selector contact,
for example, 2|. Contacts |95 and |96 of reg
ister M being closed, stepper magnet 20 is ener
gized through circuit B-8-24--25-9--31
30-3 |---32--38-| 96-| 95-39-B, and begins
to rotate wiper 35 which in due course reaches
the line contact corresponding to the interrupted
loop, in the present instance, contact l, no mat
ter what its prior position was.
With the cus
tomary rates of code signal impulses used in this 70
type of installations, and with the switching ,
by consecutively connecting the contacts with
speed of commercially available telephone pre
the selector lead 36. In well known manner, the
wiper progresses always in the same direction
selector switches, the Wiper is able to cover the
whole range of line contacts during the shortest
and, having a sliding contact at each end, again
interval between signal impulses, so that contact 75
I is securely reached before the loop Vis again
closed and contacts 2l and 24 broken in the
course of signaling.
When the wiper has reached contact I, register
magnet 3| 3 is energized through circuit B-S
24-2 I _4 I _I -35-3 6--49-3 I3--48-B, starts
thepaperfeedtrain of the register and causescam
3II to rotate, thereby opening contacts |95, ISB.
These contacts being in the energizing circuit
10 of the stepper magnet 39, the selector switch is
stopped and the connection between signaling
loop L and reception circuit maintained. Since
the time elapsing from> energization of magnet
3I3 to the opening of switch I 95-I 96 is shorter
15 than that needed by the stepper magnet to move
the wiper from one line contact to the next,
the connection is always established at the proper
contact, in this case contact I. Signals can now
be received through the operation of line relay
E dropping and attracting its switch member 24
as the loop L is interrupted and again closed,
member 24 energizing and deenergizing the re
ception circuit through selector Contact 2I. The
signals are, for example, recorded by register M,
25 or manifested at other devices connected to re
ception circuit A. Upon running down of the
register feed train after completion of a signal,
as above explained, contacts |95 and I 98 close
and the device is again ready for signal recep
30 tion from any one of the loops, member 24
having been in the meantime attracted, inter
rupting contacts 25 and 2| and therebydeener
gizing magnet 3I3.
If one loop, for example L', should be inter
rupted when another loop, for example L, des
patches signals, the wiper stopping at line con
tact I can not proceed to line contact 2, cor
responding to L', before the signal from L is ñn
ished,because of the interruption of the energizing
40 circuit of Stepper magnet 3|) at register contacts
relay S, a station battery B, and reception cir
cuit -A- similar to the' corresponding elements of
Fig. 1,> designated with like numerals. The reg
ister P is somewhat different from register M
vof Fig. 1 and comprises two sets of contacts, ~~
one of which is normally closed and opens upon
energization of the register magnet, staying open
for a predetermined period, whereas the second
set of contacts is normally open andv closes only
for a very short time -»immediately before the first I
set of contacts recloses. While any suitable de
vice performing this function may be employed,
a register device somewhat similar to that de
scribed as relay I in Patent No. 1,627,685 to C. E.
Beach is herein shown. This device comprises a iis
normally deenergized register magnet IBI, an
armature M33 with ledges, a detent arm |04, a
lever H4 with toothed segment H6 and pin 5I,
and a time relay movement with cam |24, stop
ledge |25, gear train H8, and escapement I23.€ 20
Upon energization of magnet IUI, armature ID3
releases arm IM which in turn releases ledge
`#L5 and therefore the movement, so thatcam
IM begins to rotate, returning arm |04 to nor»
mal position and quickly depressing lever II4,1~"25
-which is permitted by the ratchet device of gear
train II8. After lever H4 is released by cam
IZê, it can return only slowly into initial posi
tion, due to escapement I23, which is now con
nected to segment IIS by the ratchet device.- f Pin`
5I of lever H4 actuates two switches, a normally
open restoring switch with spring contacts 52
and 53, and a normally closed register switch
with contacts 54 and 55. The contacts 52 and
53 and their function are schematically shown ~» 35
in'Figs. 3, 4, 5, and 6, as follows: As indicated
in Fig. 3, spring contact 52 has an extension
56 for engagement with pin 5I, which, however,
clears the body of spring 52. -Upon descending,
pin 5I first releases spring contact 55, thereby? 40
interrupting connection between- 54 and 55.
If a loop, for example L', should remain open
Later (Fig. 4) it engages extension 56 at the
indefinitely, as in the case of an accidental break
inside,'slides down 56, and leaves it again, there
by releasing 52 into initial position (Fig. 5). The
electrical relation of contacts 52 and 53 isl there
by not inñuenced. Upon moving upwardly, pin
in the loop circuit, the wiper 35 of switch S will
be stepped around until it makes contact with
line contact 2. Register M will then be tripped,
thereby opening contacts IE5 and ISE and thus
preventing further movement of wiper 35. After
a predetermined cycle of operation, register M
50 again closes its contacts I 95 and I 96, thereby
again energizing magnet 3B of switch S, and
stepping wiper 35 out of contact with line con
tact 2. This interrupts the path through regis
ter magnet 3 I3 and thus restores the register to
Ul Ul normal condition. Magnet 30 continues to step
Wiper 35 until it either finds another loop cir
cuit open or until it again makes contact with
line contact 2. If no other loop is open, the reg
ister M will again be tripped and the cycle de
60 scribed above will be repeated until loop L’ is
restored to normal closed circuit condition, or
until the driving power for the register is ex
5I engages the outer side of extension 56 and
presses 52 towards 53, establishing contact dur
ing the'engagement between pin 5I and exten
sion 5E, whereupon 52 and 53 separate again and 50
shortly thereafter, pin 5I recloses contacts 54
and 55. Similar to the operation of register M
of Fig. 1, the feed train of register P is so timed
that contacts 5G, 55, opened upon initial ener
gization of magnet lill, reclose only after the4
lapse of a period somewhat longer than the
longest interval between signal impulses.
Each loop L, L', etc., is associated with a re
store relay D, D', etc., each restore relay having
a restore magnet 5I Vcontrolling two normally
closed switches 62 and 63, herein referred to as
stepper magnet switch and cut-off switch, re
spectively, and a change-over switch 64. As
shown in Fig. 2, one contact of switch 62 is
connected to one terminal of magnet 6I, whereas 65
the other’ magnet terminal leads to the movable
element of changeover switch Si! which normally
connects the magnet with a contact 55, herein
called energizing contact, but which contacts
with contact 55, herein referred to as holding
contact, -upon being attracted by 6I. As sche
matically indicated in Fig. 2, this change-over
Whereas circuits according, or similar, to Fig. 1
are suitable for use in installations with central
stations which are permanently supervised, the
operator disconnecting any signal loop which re
mains open indefinitely, modifications similar to
Fig. 2 are preferable where constant supervision
70 is not contemplated, so that the repeating mech
anism should respond only to sound signal loops
regardless of the presence of faulty loops, with
out the necessity of manual readjustment.
- switch should be so arranged that when the mov
The embodiment shown in Fig. 2 has signal able member 64 is attracted by 6I, it will make
loops L, line relays E, a station bus 8, a selector contact with 66 before breaking contact with'65.«.;75
` lAs shown in Fig. 2, movable members 24 of line
normal position, enabling the repaired loop again
relays E lead toy station bus 8, whereas selector
contacts 2|, 22, etc.,.are connected to the re
spective cut-oir switches 63 of their restore relays,
and magnet contacts 25 to their respective mag
nets 6|. The station has conveniently three addi
to actuate the repeating devices. It will be under
tionalbusses 1|, 12, 13, bus 1| being connected
is faulty and requires attention.
to the pole of battery B which is also joined to
reception circuit bus 4B. Bus 1I also electrically
joins all holding contacts 66. The -movable mem
bers of allstepper switches 62 are connected to
bus 12, which leads to one terminal of stepper
-magnet 30. Bus 13, electrically joining all en
ergizing contacts 65, leads to Contact 53 of the
.15 restoring switch of register P. Each cut-ofi'
switch 63 leads to thecorresponding line contact
of the selector relay S, Fig. 2 showing the cut-off
switch corresponding to loop magnet II con
nected to line contact I, and the cut-oñ switch
corresponding to magnet I2 connected to line
Contact 2.
Similar to the embodiment of Fig. 1, wiper 35
leads to reception circuit conductor 45, register
magnet IDI is connected intermediate the wiper
and the'battery, in parallel with the reception
circuit, and register switch 54-55 normally con
neots/ the battery with vibratorv 3|,” 32 of selector
relay S. Contactv 52 of the normally open restor
ing switch of register P` is also connected to the
(§30 battery.
` The circuit shown in Fig. 2,> with an individual
restore relay for each loop, operates in the fol
lowing manner. As described before, the line
relay E' of an interrupted loop, for example loop
..35 L, drops member 24, connecting` the battery with
contacts 2| and» 25. This closes a circuit B-8
_24--2 5_8 2--1 2_30-3 I ---3 2-54-5 5-46 -- B,
which energizes stepper magnet 30, thereby start
ing theA selector switch. Wiper 35 having made
M10 contact with the respective linev contact, in the
present example contact I, establishesV a circuit
B --- 8_2 |--63--I---35--45--|0 |-46 -- B
energizes register magnet IBI. Register P starts
its feed train and immediately opensr contactsr 54,
n.45 55, thereby arresting'the'wiper of the selector
switch at line contact I, connecting with selector
contact 2|. The above-described registering
means are nowready to receive signals from outer
circuit L, through interruption of contact 2| of
50 line relay E responding to signaling impulses.
After the signal has been received> and the reg
ister movement nearly run down, contacts 52,
53. close momentarily, as hereinbefore described,
thereby closing a circuit B--8-24-2 5-6 I-SII
55 65-13L-53-52-4`5--B and >energizing restore
magnet E |- which attracts switch members B2, 63
and 54, changing 64 from energizingY contact 65
to holding contact 6G and opening stepper and
cut-ofi switches 62 and 63, respectively. This
60 establishes a holding circuit B-1I-66-64
6|-25-24-8-B for magnet 6|, so that |ì2` and
63 are retained open soflong‘ as line magnet II
remains deenergized, member 24 droppedand 25
closed. If, therefore, any one loop should not
become normally closed upon having transmitted
a signal, but remain open for an undetermined
time, as perhaps due to a break, its restore relay
D restores responsiveness of the repeater with
respect to the remainder of the loops, whereas
70 the faulty loop is excluded from influencing the
signal manifesting circuit so long as it remains
open. Upon reclosing it, energization of loop
magnet I I and lifting of member 24 ensues, open
ing the holding circuit of restore magnet 6| at
25, so that members 62, 63, and 64 return to
stood by any one skilled in the art that alarm
devices can be introduced, for example, in con
nection with members |52v and 63, vfor indicating '
at the central station or elsewhere that a loop
Fig. '1 shows a modification similar to the cir
cuit of Fig. 1,*but of the reiiex type and perform
ing additional’functions. As in Fig. 1, there are
loops L, L', L", etc., in which the signal formulat
ing stations N are of the so-called non-inter
fering and succession type or in which signal
manifesting devices as, for example, gongs G,
are included, and a station with line relays E,
battery B, busses 8 and 9, reception circuit A,
and a selector relay'S’.
There are in addition
-a cut-off relay C, an actuating relay F, and a
reflex relay R.
The cut-oir' relay C is somewhat similar to 20
the restore relay D shown in Fig. 2, and has a
cut~ofî magnet 8| controlling a step-per magnet
switch'82 with stepper contact 83 and a change
over switch 84 with cut-off contact 85 and hold
ing contact J86. Switch member 84 is connected
to one terminal of 'magnet 8|, and contact 86
and stepper switch member 82 are electrically
The selector relay S’ is similar to relay S of
Fig. 1 but has auxiliary short-circuiting switches
here indicated by two sets of auxiliary line
contacts I', 2', 3', etc., and I”, 2”, 3", etc., cor
responding to line contacts- I, 2, 3 etc. of the
main selector switch, and two auxiliary wipersk
35’ and 35", mechanically or otherwise asso
ciated with wiper 35 for conjoint movement and
electrically joined' by conductor 48.
Actuating relay F has an actuating magnet
9| and normally open spring contacts 92, 93 vwhich
close quickly upon energization of magnet 9|
and open again a predetermined time after the
last preceding energization of 9|.
Any mecha
nism suitable to perform this function may be
employed. Fig. '1 shows, as an example, the fol
lowing arrangement: A lever 94 is pivoted at 95
and has linked thereto'armature 95 and catch
91. A toothed segment 98 is also pivoted at 95
and has a hook 99’ adapted to be engaged by
catch 91,. An escapement and ratchet device |90
permits quick rising of segment 98, but only a 60
slow dropping thereof. If magnet 9| is deen
ergized, contacts 92 and'93 are separated by
insulating block 90 of segment 98. If 9| becomes
energized, lever 94 quickly lifts segment 98, per
mitting contacts 92 and 93 to close. Arrived in
elevated position, catch `91 strikes stop |92 and
releases hook 99 of segment 98 which thereupon
begins’to drop slowly, and' at its lowest position
again separates the switch contacts. Upon de
energization of magnet 9|, lever 94 drops, its 60
catch 91 reengaging hook 99. It is apparent that
contacts 92 and 93 always reclose after a pre
determined time from the last energization of
magnet 9|, no matter whether or not `segment
98 has partly dropped between two energizations. 65
The reñex relay R has .areflex magnet |39
which controls, a series of normally closed reflex
switches I3I, |32, |33, etc., one for each signal
Asin Fig. l1, the members 24 of line relays E
are interconnected by bus 8, and" their magnet
contacts 25A by bus:9. Selector contacts 2|, 22, 23,
etc., are connected to the corresponding line con
tacts I, 2,'3, etc., of the selector'relay S’. Reiiex
switches | 3| , |32, |33, etc., are serially included
in the signal loops through conductors 23|, 232;
33|, 332 and 43|, 432 respectively, the loops re
maining closed so long as the reflex switches re
Ul main in their closed position, that is, so long as
reflex magnet |30 is deenergized. By means of
conductors 233, 333, 433; 234, 334, 434, auxiliary
line contact pairs |’, l”, 2', 2”, 3', 3", etc., are
connected in parallel to respective signal loops,
short circuiting reflex switches |3|, |32, |33, etc.,
respectively, upon being bridged by wipers 35',
35" and conductor 48.
Actuating magnet 9| of actuating relay F is
segment 98, by dropping, again opens contacts
92 and 93, thereby opening the holding circuit
of magnet 8| and therefore restoring the whole
circuit `to normal condition, ready to receive and
to repeat subsequent signals from any one of the
If two loops, for example L and L', should des
patch signals simultaneously, it might happen
(assuming the absence of actuating relay F, and
that L’ starts signaling subsequently to L) that 10
L’ begins to repeat in the middle of one of its sig
nal groups, immediately following the last sig
nal group of L, which could easily cause misinter
connected between bus 9 and one pole or bat
pretation of signals. However, actuating relay F
tery B, and actuating switch contacts 92, 93 be
tween the other pole of B, and, through conductor
|4|, to the movable member of stepper magnet
switch 82 and to the holding contact 86 of cut-off
relay C. The stepper contact 83 and vibrator
contact 32 of stepper magnet 38 are joined by
maintains contacts 92, 93 closed, cut-off 8| ener
conductor |42, and cut-01T contact 85 of cut-off"
relay C is connected to conductor 45 of the alarm
circuit and therefore to wiper 35. Cut-off mag
net 8| is connected intermediate, therefore, to
change-over switch 84 and battery B, by means
of conductors 89 and 48.
Reñex magnet |38 is connected between the re
ception circuit conductors 45 and 46 and may be
in series with other suitable signal responsive
30 devices, as indicated by apparatus 58, or may be
connected independently in parallel to such re
sponsive devices, as indicated at |58.
The reflex repeater circuit of Fig. '1 operates in
the following manner, As previously described,
the interruption of a loop, for example L, causes
members 24 to drop. Contact 25 closes a circuit
gized, and therefore stepper contacts 82, 83 open
during a certain time interval after loop L has
stopped signaling. Hence, stepper magnet 38
can not be energized before that time, wiper 35
can not connect contact 2 to the alarm circuit, 20
and signals from L’ can not be repeated until an
interval has elapsed that is sufficient for separat
ing the signals of L and L’.
If this time interval is chosen a trifle shorter
than the longest interval within any one series 25
of signals (this longest interval being the so
called round pause), but longer than any other
signal interval, the signals of the subsequently
signaling loop L’ are repeated commencing with
the start of a complete round.
In case a loop, for example L, is accidentally
broken and magnet || permanently deenergized,
magnet 9| remains energized, but contacts 92, 93
nevertheless open after a certain time, breaking
the holding circuit for magnet 8 I, which will then
B-8-24-25-9-9I-B, energizing magnet 9|
of actuating relay F, which thereupon promptly
vibrate since wiper 35 is still at contact | and
thereby holding the energizing circuit for 8|
closed. Stepper magnet 38 is at the same time
closes contacts 92, 93. This establishes a circuit
B_92-83- | 4 |-82-83-32--3 |-38-B which
disconnected, so- that no other loop can possibly
transmit signals so long as one loop is abnormally 40
energizes stepper magnet 38, actuating the selector
interrupted. Relay C keeps vibrating, indicating
relay, whose wiper 35 advances until reaching line
contact |. At this moment, a circuit B--8-24
2 I- |-3 5-85--84-8 |-8 9-46-B is established,
energizing cut-off magnet 8| which attracts
switch members 82 and 84, opening contact 82,
and changing connection of 84 from 85 to 86.
This establishes a holding circuit B~---92-93I4|-86--84-8|-89-48-B for magnet 8| and
breaks the energization circuit of stepper magnet
38, thereby stopping wiper 35 at contact I, which
establishes association between loop L and recep
the faulty condition, until loop L is repaired or
member 24 of magnet || manually lifted, there
by separating loop L from the installation.
The modification shown in Fig. v8 and claimed
in Patent No. 2,040,288 of May 12, 1936 utilizes
a circuit similar to, but somewhat simpler than
tion circuit A. At the same time, cut-01T magnet
8| is disconnected from circuit A.
The reception circuit is now enabled to repeat
any signal despatch from L, and such signals are
also reflexed into the other loops, but not into L,
in the following manner.
Reflex relay Ris con
nected across the reception conductors 45, 46, and
its magnet |38 is energized every time loop L is
interrupted and selector contact 2| connected to
member 24. The reñex magnet then opens
switches |3|, |32, |33, thereby correspondingly
interrupting loops L’ and L" and actuating any
signal responsive devices G which may be included
in the loops. When wiper 35 connects contact |
with reception circuit conductor 45, wipers 35’
and 35" rest at contacts |' and I", conductor 40
connecting these two contacts and therefore
shortcircuiting switch |3|, so that signaling loop
L is not affected by the opening of switch |3| of
the reilex relay.
A predetermined time after loop L has stopped
signaling, that is, a certain period after magnet
9| of actuating relay F has lastbeen energized,
that of Fig. '1, its signal loops being supplied
with alternating current. In certain instances
it may be desirable to use alternating current in 50
the outer signaling circuits, but, station equip
ments being usually not well suited for opera
tion with such current, an arrangement like
that to be described is preferable and useful in
such instances, since it permits the use of the 55
customary direct current station apparatus.
The loops L with alarm boxes N are supplied
with alternating current of suitable voltage and
frequency from supply busses |2|, |22, through
supply transformers ||8.
Each loop has a line
transformer T with primaries |5|, |52 having
terminals |58 and |59 on either side of tap |50.
An adjustable impedance |55 is provided which
reproduces the electric characteristics of loop L.
Secondary |58 of supply transformer ||8 is con
nected between tap |58 and terminal |10 of the
impedance |55, loop L is connected between ter
minals |18 and |59, and impedance |55 between
terminals |58 and |18. It is apparent (especially
from Fig. 9, which groups these elements in a 70
somewhat simplified, but equivalent manner),
that the electromotive forces of primaries |5|
and |52 balance each other, provided that the
primary windings and loop L and impedance |55,
respectively, are electrically substantially equiva
lent, in which case no electromotive force is in
latter advancing wiper 35funtil it touches line
duced in secondary |60 of transformer T, so long
contact |. At this moment, a circuit |68-8-46
8|-I13-84-85--65-35-I--IH is closed, ener
gizing cut-off magnet 8| which attracts its arma
tures 82 and 612, opening the above traced stepper
as the loop is closed.
Secondary | 60 supplies the input terminals I6 |,
|62 of rectifier bridges |63, |66 of conventional
design, supplying output terminals |66, |61 and
|68, | 1| , respectively, with unidirectional current,
if an electromotive force is impressed in second
ary |60.
In Fig. 8, terminals |66, |61, |68 of
10 all line transformer circuits are denoted with
these like numerals, whereas the fourth terminals
of the loop have numerals |1|, |12, etc. All
terminals |66 and |68 are joined by bus 8 and all
terminals |61 are joined by bus 9, whereas ter
minals |1|, |12, etc., are connected to corre
sponding line contacts |, 2, etc. of selector relay S.
Selector relay S, cut-off relay C, and reception
magnet circuit at 82, and changing member 84
from cut-off contact 85 to holding contact 86.
This action instantly interrupts the stepping ac
tion of magnet 30, arresting the Wiper at the
appropriate line contact |, and establishing a 10
holding circuit negative terminal of rectifier
|15-66--8l-l13-84-86--9 for cut-01T magnet
8|, so that no other loop can interfere with the
signaling loop L during energization of 8|. After
loop L has finished its signal, that is, shortly 15.
before the feed train of register M’ has run down,
contacts 295, 296 are closed, shortcircuiting mag
circuit A are similar to the corresponding devices net 8|, which thereupon releases members 82 and
8d, restoring the circuit to normal condition. The
shown in Fig. '7, but somewhat differently con
resistance |13 prevents shortcircuiting of the 20
nected, as will be explained hereinafter.
Register M’ has normally open contacts 295, 296 rectifier |14 during such closure of contacts 295
and a paper feed train, and switch operating and 296.
During the signaling period, signals are re
devices quite similar to those of register M in
ceived at register M', or other apparatus, as 50,
corporated in the circuit of Fig. 1, with the dif
ference that contacts 295, 296 are normally open lconnected to the alarm circuit. The unidirec
and close effectively only for a short time just tional current furnished by rectifier bridge |64
before the feed train terminates its run. As upon interruption of the respective loop corre
shown in Fig. 8, block 3H, quickly turned by
spring 3 | 2 upon energization of magnet 3 I3, closes
30 at that time the contacts during a period which
is so short as to have no influence upon the cir
cuit, whereas, towards the end of the slow return
movement of 3| l, it closes contacts 295, 296 for
a time which is sufficient to effect the desired
' result Which will appear hereinafter.
Stepper magnet 39 is connected intermediate
bus 9 and stepper magnet switch 82, which nor
mally connects it with bus 8 through conductor
46, and also with one terminal of cut-off magnet
40 8|. The other side of the magnet 8| is connected,
through resistance |13, to change-over switch
84 which connects it normally to wiper 35,
through alarm circuit conductor 45. The holding
contact 86 is connected to the positive terminal
45 of a local rectifier |14. The negative terminal of
that rectifier is connected through conductor 46
to the bus 8, and the input terminals are con
nected to the alternating current supply busses
|2| and |22. Magnet 8| can be short circuited
50 by normally open contacts'295, 296 of the register
M’ whose magnet 3|3 is connected between con
ductors ‘l5 and 46.
'I‘he arrangement shown in Fig. 8, especially
suited for operation with alternating current, but
Ul Ui ' in principle an adaptation of the circuit of Fig.
l, with a cut-off relay added and employing in
stead of the line relays E what may be called,
for want of a better term “switchless alternat
ing current relays”, which have been described
60 hereinbefore, operates as follows: Under normal
conditions, when the loops L, L', etc., are closed,
the electromotive forces of the line transformer
primaries |5I, |52, supplied from busses |2|, |22,
sponds to the current of battery Bof the other
figures, there made available by the closing of
selector contact 2|, and unidirectional current
furnished by rectifier bridge |63 corresponds to
the direct current from battery B made available
through contacts 25. Unidirectional current is
al-so furnished by the rectifier bridge |14 for the
holding circuit of relay C. In this manner, a
signaling circuit supplied With alternating cur
rent exclusively is provided, which combines the
advantages of signal loops energized with alter
nating current and of a repeater circuit operated
with unidirectional current, without involving the 40
use of relays and local supply batteries.
If any one of the loops, for example loop L,
remains open indefinitely, the contacts 295 and
296 of register M’ will cause momentary deener
gi_Zation of magnetiil and during such deenergiza 45
tion of 8|, contacts 82 will close ' the circuit
through magnet 36 and cause stepping of wiper
35. If no other open loop circuit'is found, wiper
35 continues to step around until it again arrives'
at contact | where it again stops vand causes a
second actuation of register M'.
This action is repeated continuously so long
as` loop L remains open, thus calling the oper
ator’s attention to the faulty condition of the
system, which can be rendered responsive to the
sound loops by manually interrupting the recti
fier output leads of the faulty loop.
It will be evident to anyone skilled in the art
that the different features of the embodimentsv
herein described can be combined in various ways,
as for example, that any of these circuits can be'
equipped with reflex repeating equipment, as
shown in Fig. 7, and operated with either direct
balance one another and no electromotive force
current or with alternating current, as shown in
is induced in |60, so that the station circuit does
not carry any current. Upon interruption of a
Fig. 8.
t should be understood that the present dis-v
loop, say L, connection between |59 and |16
is broken, |5| carries no current, and the elec
tromotive force of |52 produces a current in the
70 supply circuit of rectifiers |63 and |66, so that
closure is for the purpose of illustration only,
and that this invention includes all modifications
and equivalents which fall Within the scope of the
unidirectional electromotive forces appear across
appended claims.
I claim:
terminals |66, |61, and |68, |1| respectively. The
1. A signaling system of the character de
unidirectional potential across` busses 8 and 9
supplies current to circuit 8-46-82--3l-32
scribed comprising a current supply; a reception
39-9 which energizes stepper magnet I36, the
circuit conductor; normally closed signal loops
each `including va line-'relay connectingß‘said sup
ply upon interruption of the respective loop with
contacts connected to. corresponding' selector con
a magnet contact and a selector contact; a se
tacts, respectively, azstepper magnet, and` awiper
lector relay including a stepping magnet, a series
of line contacts and a wiper actuated by said
stepping magnet„the magnet being connected to
all of said magnet contacts, each line> contact
being connected to a respective one of the se
lector contacts, and the wiper being connected to
said conductor; and an open circuit register for
10 visually manifesting signals and having a time
train with a controlling register magnet therefor
intermediate said conductor and said supply, and
a normally closed register switch intermediate
said stepping magnet and said source opening
upon energization of said registerl magnet and
closed by a predetermined run of said time train
actuated by said stepper magnet and connected
to said conductor; a cut-off relay having a cut-off.
magnet controlling a normally open holding cir
cuit closed' upon» energization of said cut-oil'` mag
net, a normally closed stepper magnet vswitch
adapted serially to; connectv said stepper magnet
and said' actuating switch across said supply, and
a cut-01T contact normally connecting` said cut
off magnet intermediate said. Wiper andv said
4. A. signaling system of theA character de
scribed, comprising a. current. source; a` plurality
of. signal loops each having. a signal- formulating.
magnet selectively to associate the line relay of an
meansl and a. signal responsive relay; a selector
switch having av contact for each loop, a signalv
reception device and ar normally closed cut-olf`
switch in a- reception circuit; an actuating means;
20 interrupted loop with said conductor, and retained
for; said` selector switch,v a normally closed circuit
in connecting position b_y opening of said register
switch which deenergizes said stepping magnet
upon energization of said register magnet after
said selector relay has selected the line contact
2. A signaling system of thev character de
scribed comprising a current supply; a reception
breaker and a` normally open switch in an actu
ating circuit. connected to said source; means
associated with- each relayv for connecting a con
tact of ‘said selector switchwith said source upon
response of a relay to abnormal, conditioning; of,
its loop, means for closing said normally open
switch upon response of said relay and> opening;
following energization of said register magnet,
said selector relay being actuated by said stepping
. corresponding to the interrupted loop.
circuit conductor; normallyy closed signal loops
it a predetermined time thereafter; and means
each including a line relay with a magnet con
for opening said reception circuit and said circuit
breaker upon connection of said contact with said
connected with said supply upon interruption of
source until said switch reopens.
301 tact and a selector contact, both contacts being
the respective loop; a selector relay including a
stepping magnet; a multiple contact selector
switch actuated thereby and connected to said
ê~ conductor; a register for recording and visually
manifesting signals, said register including a reg
ister magnet connected intermediate said con
ductor and said source, a normally closed reg
ister switch intermediate said stepping magnet
and said supply and opened by- said register mag
net during signal receiving periods, and a nor
mally open restore switch momentarily closing to
wards the end of said periods; and a restore re
lay for each loop, each restore relay having a
normally deenergized restore magnet connected
intermediate the magnet contact of its loop and
said source through said restore switch and con
trolling a stepper switch normally connecting said
magnet contact with said stepping magnet, a
cut-oil’` switch normally connecting the selector
contact of the respective loop with a correspond
ing contact of said selector switch, and a hold
ing circuit, including said magnet contact, for
said restore magnet, said register switch arrest
ing said selector relay upon reaching the line
contact corresponding to an open loop, and said
restore switch energizing said restore magnet a
certain time after energization of said register,
thereby causing said restore magnet to maintain
said stepper switch and said cut-01T switch open
until said line relay opens said magnet contact
upon reclosing of said loop.
3. A signaling system of the character de
scribed comprising a current supply; a reception
' circuit conductor; normally closed signal loops
each including a line relay with a magnet con
tact and a selector contact, both contacts being
connected with said supply upon interruption of
the respective loop; an actuating relay having an
actuating magnet energized through said magnet
contact, and a normally open actuating switch
closed upon energization of said actuating mag
net, said actuating relay including means for
maintaining said actuating switch closed for a
predetermined time; a selector relay having line
5. A signaling system of the character de
scribed comprising signal loops; a reception cir
cuit; loop selecting means adapted consecutively
to associate each of said loops with said circuit;
meansy includingv a. time train for effecting actu
ation of, said selecting means upon abnormal con
ditioning of one of said loops; and cut-off means
for instantaneously arresting said selecting
means. when it has estab-lished association be
tween an abnormal loop and said circuit, said
actuationeffecting means. maintaining said cut
off means eifective for arresting said selecting
means throughout a predetermined run of said
time train from the beginning of _said abnormalv
6. A signaling system of the character de
scribed comprising a plurality of signal loops
each having means for formulating code signals
comprising groups of impulses; a recording de
vice for visually manifesting signals, said device 50
having electromagnetically controlled mechanism
responsive to signals formulated in any of said
loops; control contacts, associated with said
recording device, and abnormally conditioned by
said mechanism in certain predetermined time
relation to the response of the mechanism to the
iirst and last impulses of any such signal; a
selector switch having a plurality of selector con
tacts, one for each of said loops and a stepping
magnet in series with said control contacts and 60
establishing connection at the selector contact
associated with any one of said loops in response
to the first signal impulse formulated in said
loop; a current sour-ce for operation of said
recording device and said stepping magnet; and 65
means for actuating said selector switch in re
sponse to a ñrst signal impulse to associate said
recording device through said selector contact
with the loop in which formulation of said im
pulse originated and with said source, for re 70
sponse to such signal, said control contacts
supervising said stepping magnet for maintain
ing said association effective throughout, and for
a predetermined time following, the formulation
of said signal.
7. A signaling system of the character de
scribed comprising a plurality of signal loops each
seieotor switch upon abnormal conditioning of
one of said loops for selectively associating said
abnormal loop with said recording device; and a
having means for formulating code signals corn
prising groups of impulses; a recording device for
restore magnet connected with said source in se
visually manifesting signals, said device having
ries with said restore switch and actuated by said
operation of said restore switch to open said cut
electromagnetically controlled mechanism re
sponsive to signals formulated in any of said
loops; normally closed control contacts associ
ated with said recording device, and opened by
10 said mechanism in response to the iirst impulse
of any such signal and hel-d open by said mech
anism until after the expiration of a predeter
mined interval following response of the mecha
nism to the last impulse of said signal; a selector
16 switch having a plurality of selector contacts, one
for each oi said loops and a stepping magnet in
series with said control contacts establishing con
nection at the selector contact associated with
any one of said loops in response to the first signal
impulse formulated in said loop; a current source
for operation of said recording device and said
stepping magnet; and means for actuating said
selector switch in response to a i'lrst signal im
pulse to associate said recording device through
said selector contact with the loop in which
formulation of said impulse originated and with
said source, for response to such signal, said nor
mally closed control contacts supervising said
stepping magnet for maintaining said association
30. effective throughout, and for a predetermined
time following the formulation of said signal.
8. A signaling system of the character de
scribed comprising signal loops having circuit
energizing means made effective upon abnor
35. mal conditioning of a respective loop; a current
off switch, thereby disconnecting said selecting
meansfor any loop remaining abnormally con
ditioned for more than said predetermined time.
9. A signaling system of the character de 10
scribed comprising signal loops; a receiving sta
tion current source; a signal recording device
conditioned for signal reception by a recorder
magnet and having a normally closed control
switch opened-at the energization of said magnet
and a normally open restore switch momentarily
closed a -predetermined time after each signal
reception period; for each loop a line relay hav
ing a magnet contact and a selector contact both
connected to said source upon abnormal condi 20
tioning of their respective loop; for each loop a
restore relay including a restore magnet between
said magnet contact and said restore switch, a
normally closed stepper switch and a normally
closed cut olf switch in series with said recorder
magnet and said selector contacts of said line
relay respectively, and a holding circuit for said
restore- magnet including said magnet contact;
and a selector switch having a plurality of con
tacts one for each- of said loops, and a stepping 30
magnet in series with said selector contact, said
control-switch and said stepper switch; said selec
tor switch connecting in response to abnormal
conditioning of one of said loops said recorder
magnet with the'selector contact of said abnor 35
source; a signal recording device having a nor
mal loop, said recorder magnet, by opening said
mally ineiîective restore switch mechanically
control switch,~arresting said selector switch at
the Contact associated with said abnormally con
ditioned loop for signal reception by said re
closed at a predetermined time after a reception
period preceding the coming to rest of the re
cording device; loop selecting means including a
stepping magnet connected for energization
through said energizing means and a selector
switch connected to said source through said en
ergizing means in series` with a normally closed
l cut oif switch, said stepping magnet moving said
cording device, and said restore switch actuating 40
at said predetermined time said restore magnet
causing it to disconnect said abnormal loop by
opening its stepper and cut off switches.
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