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Патент USA US2121182

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June 21, 1938.,
.
' '
'
‘
A. s. BENJAMIN
,
2,121,182
SELECTIVE SIGNALING SYSTEM
Filed Feb. 7, 1934
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42,121,182
Patented June 21, 1938
UNITED’ STATES PATENT P‘ OFFICE
2,121,182‘ I
SELECTIVE‘ SIGNALING SYSTEM
‘Abraham‘S.
Teletype Corporation,
Benjamin, Chicago,‘I~ll.,
Chicago,‘ Ill.,va‘
assignorfto‘
corporation of Delaware
'
Application February 7, 1934, Serial Noffi o
v
‘*1 Claims.
(01. rim-s52)
‘This invention pertains to signaling systems‘ cated and with details of‘ central office control
andmore particularly to composite ?re alarm and
apparatus, and
printing telegraph systems arranged to permit
transmission to a plurality of stations simul
taneously.
,
‘
‘
v
.I'
by
r
.
‘
t Fig. 2 shows details of a station.
‘
provided
Printingwhich'maybroadcastby
telegraph{transmitting equipment
suitable curis 5'5
‘
rents to the ‘stations inugr‘oups, andvmanual im- ‘
The ‘principal object of the invention is the pro
vision of a signaling‘ system'includingi a central
or control station and a'plurality of distant sta
pulsing ‘keys ‘are provided which will supply to
the stations signal impulses of .certaincurrent
strength for operating either of two signal bells
tions arranged so that the control station may
according tothe‘ polarity‘of thelapplied current. ‘
10 communicate telegraphically ‘or through the op
Switches‘ are arranged for‘ transferringjsignal
lines fromthe printingservice to the bell operat
eration of audible signaling apparatus with all
of thestations or with any group of the stations.
ing service and‘ vice versa.‘
Another object is to provide for dividing the
‘
WvAcontrol ‘circuit for printing telegraph signals
comprises‘ ‘telegraphf transmitter l, telegraph ‘1‘5
distant stations into groups so that one or more
groups of stations may be‘selected to receive a
_ message and other groups excluded from such
printer‘ 2, and ‘, transmitting relays 3, 4, and‘ 5,
The above and other objects of the invention
whose ‘cont‘a‘Qtstand ‘armatures are connected.
through contacts of keys ‘6, "I, andv8 to lines 9,
wires the signals suitable for the message‘to‘be
Relay l?y‘responds' tobpolar signals‘ and has two
message.
‘
i
ill,“ and‘v Vljl which‘ have ‘each va ‘plurality ‘of sta- I
are attained by connecting ,a plurality of sta
20 tions together in groups by a line wire and then tions ‘ l‘2.‘ ‘Any key may be,‘ operated to transfer
extending that line wire to a central o?ice and its associated line from ‘the printing telegraph
proceeding thus until all stations are connected control circuittojthe bell control key l3 and any
in several such groups. At the central of?ce, each i orall keyst‘, 1‘, 8, maybe operated atone time.
Each station 12 has circuits and“ apparatus as M
line wire has a switch by which one group or
shown in Fig. '2 in'which three ‘line relays are ‘25
25 more or all groups may be connected to a trans
mitter which will transmit upon the selected line connected‘, in vthej'circuit .ofr the signaling line.
transmitted. - Thus a selectivity in type of signals
is employed to enable the operator at the central
30 office to‘ sen-d electrical signals of different kinds
to operate at the stations electrical receiving
devices of di?'erent classes, the equipment at the
stations being such that each station is equipped
35
'
.
The apparatus at each station comprises an
4
mally held .out of‘ contact‘with either contact by
a centering ‘springjl‘8‘., ‘Relay l4 is‘marginal and ‘23:0
willuopera'te only when supplied‘with a current
of “50 milliamperes or more ‘and responds selec
tivelyto polar currents either ,to close tongue I‘!v
with a plurality of different types of signal re-‘ to contact “l5‘1to' operate‘ ‘bell'l9 by current from
ceiving devices and the devices are so associated battery 20, or to‘ close tongue‘ H to contact I6 to '
operate belll Z'I‘by‘ current from battery 20.v
that any signaldevice may be operated inde
Relay 22 ispola-r and is sensitive to currents of
pendently of all other signal devices at that sta
tion.
40
contacts ‘|._‘5 and l?pand a tongue I‘! whichis I101’?
audible signal deviceor a plurality of‘ such, devices’
and also a printing telegraph receiving‘ device‘.
These several receiving devices are associated
with the line wire by means responsive selectively
to signals in the line such that only one receiving
device will respond to any‘signals sent from the
control o?ice.
At the ‘central control o?ice a signal transmit
ting device for each type ‘of signal to be trans
mitted is provided, and switches are arranged to
50' permit any transmitting device to be connected to
any line or to any group of lines at one time.
A better understanding of the invention may be
had from the following description, taken in con
junction with the accompanying drawing, wherein
Fig. 1 shows line circuits with stations indi
value 'less than 50 Tmilliamperes, ‘and by its con
tactv it controls the operation‘of a telegraphic
receiving printer‘23 by current‘from‘ battery 24.
,‘Relay 25 ‘is marginal and responds whenever
relay l4 responds to current in the signaling line.
The function of relay 25 is llOuDI‘GVGl’lt the opera
tion of the receiving printer 23 upon signals which , ‘
operate relay {,4 and which also operate relay 22. 45
This function is effected by‘providing ‘the arma
tureof relay 25 with a contact to operate a slow
to-release relay 26 which by a cascade circuit
operates a slow-to-release relay 21 which short
circuits contacts oflrelay 22 and closes the circuit
56
of receiving printer 23 so that it will be unre
spons‘ive to control by relay 22. ‘
Station l2 therefore requires a strong positive
curtentj‘tofoperate ‘relay [4 to operate bell IS, a
strong“ heg‘ativ‘e‘current ‘to operate relay M to 55
2
2,121,182
operate bell 2|, and at other times it requires
weaker currents, both positive and negative, in
properly timed signals to operate relay 22 to con
trol the receiving printer 23. These several cur
rents may be supplied by controlling mechanism
at the central o?ice, Fig. 1.
.
Keys 6, 1, and 8 are shown set for connection
of lines 9, I0, and II to contacts of relays 3, 4,
and 5, and the system thus is shown in condition
10 for transmission of printing telegraph signals.
Operation of transmitter I causes code signals
upon relays 3, 4, and 5, and each such operation
causes a reversal of current in lines 9, III, and II.
With relay 3 energized as shown, current from
16 battery 30 ?ows through'wire 3|, resistor 32,
front contact and armature 33, "wire 34,'in'ner
contact and switch spring 35, line wire 9 and sta
tions I2, switch spring 36 and» inner contact, wire
31, armature 38 and frontcontact, resistor 39,
20 and wire 40. When relay 3 is deenergized for a
spacing signal, current ?ows from positive pole
of battery 30, through wire 3|, resistor 32, back
contact and armature 38, wire 31, inner contact
and switch spring 36, line wire 9 and stations I2,
25 switch spring 35 and contact, wire 34, armature 33
and back contact, resistor 39, and wire 40. The
polar direction of. the current through linewire 9
is reversed by operation of relay 3 and trans
mitter I and relay 3 thus controls polar relays 22
30 at all stations I2 in line 9, signals being repeated
in a local circuit containing battery 24 and re
ceiving printer 23 and thus recording upon re
ceiving printer 23 all messages generated by
transmitter I at the central o?ice.
35
,Key 5 when operated to its alternative position,
connects its springs 35 and 36 to outer contacts
‘and provides a circuit for operation of manual
impulsing key I3. When key I3 is operated down
wardly, it engages its lower contact 4| and closes
40 a circuit for current from negative battery 42
through contact 4|, key I3, wire 43, resistor 44,
outer contact and switch spring 35, line 9 and
stations I2, operated switch spring 36 and outer
contact, resistor 45, and wire 46 to battery 42.
45 Alternatively, when key I3 is operated upwardly
it engages its upper contact 41 and provides a
circuit for current from positive battery 48
through contact 41, key I3, wire 43, resistor 44,
outer contact and switch spring 35, line 9 and
50 stations I2, operated switch spring 36 and outer
contact, resistor 45, and wire 46 to battery 48.
.The operationof key I3 into engagement with
its contact 4| provides current from negative
battery 42 of sui‘n‘cient strength to operate station
55 relays I 4, 22, and 25, under which conditions relay
I4 operates to engage its contact I6 and thus to
operate the signal device 2|, relay 25v operates
to energize relays 26 and 21 to control the local
circuit of receiving printer 23, and relay 22 oper
60
ates ine?ectively because the circuit of receiving
printer 23 has been closed at relay 21. Thus, in
response to key I3 in engagement with its con
tact 4|, signal device I9 is not operated because
65 tongue I1 moves away from contact I6, receiving
printer 23 is not operated because its circuit is
controlled by relay 21, and signal device 2| is oper
ated solely because tongue I1 is moved against
contact I6. Alternatively, when the key I3 is oper
70 ated to engage its contact 41, positive current is
supplied by battery 48 to stations I2 of sui?cient
strength to operate relay I4 to engage its contact
I5, relay 25 is operated to energize relays 26 and
21, and relay 22 is not operated-or is operated to
75
close its , contact because of, the direction or
polarity of the applied current. Thus signal de
vice I 9 will be operated solely.
With key 6 in position as shown in the ?gure,
operation of the transmitter I will provide in
line 9 signaling currents of su?icient volume to
operate relay 22 at each station and of volume
insufficient to operate relays I4 and 25 so that
with relay I4 unoperated, signal devices I9 and
2| 'will'be 'unoperated and receiving printer 23
will be operated through a local circuit including 10
receiving printer 23, battery 24, and contacts of
line relay 22, under control of transmitter I at
the central o?ice.
As is evident from Fig. 1, the stations I2 on
the line conductors I0 and II may be associated 15
with the respective transmitters through the
operation of keys 1 and 8. Thus the stations may
be selectively connected into groups.
The invention has been described with refer
ence to a speci?c system of switches and circuits 20
designed to illustrate the principles of the inven
tion, but its utility is not limited by the speci?c
form shown, being limited only by the scope of the
appended claims.
What is claimed is:
25
1. In a signaling system, a single line circuit,
a station having a polar relay in series with said
line circuit operable on current of a predeter
mined strength, a polar relay connected in series
with the ?rst mentioned polar relay operable on 30
current of lesser strength, and means operable
on the same current strength as the ?rst men
tioned polar relay for rendering the second men
tioned polar relay ineffective.
2. In a signaling system, a single line circuit, a 35
station having a plurality of signaling devices,
means in said line circuit operable on current of
apredetermined strength for controlling certain
of said signaling devices selectively, a polar relay
connected in series with said means and operable 40
on a lesser current for controlling a signaling
device, and means operable on the same current
strength as the ?rst mentioned means for dis
abling the signaling device controlled by the polar
relay.
'
3. In a signaling system, a single line circuit,
45
a station having a plurality of signaling devices,
means in said line circuit operable on current of
a predetermined strength for controlling certain
of said signaling devices selectively, means con 50
nected in series with the ?rst mentioned means
and operable on a lesser current for controlling a
signaling device, and means in series with the
?rst and second mentioned means and operable
upon the same current strength as the ?rst men .55
tionedmeans, for disabling the signaling device
controlled by the second mentioned means.
4. In a signaling system, a line conductor ex
tending to a station, two normally open local
circuits, a polar. relay at said station responsive 60
to currents of a predetermined value for control
ling said circuits selectively, two audible signal
producing devices, one in each of said circuits, a
recording device at said station responsive to cur
rents of a value lower than said predetermined 65
value, and means at said station. operating in
response to currents of said'predetermined value
only to disable said recording device, said polar
relay, recording device and disabling device being
connected in series.
.
70
5. In a signaling system, a single line circuit,
a station having a polar relay in series with said
line circuit operable on current of a predeter
mined intensity, a polar relay connected in series
With-the ?rst mentioned polar relay operable on 75
3
2,121,182
cluding a polar relay operable on current of a
current of lesser intensity, a non-polar relay oper
able on the same current intensity as the first
predetermined intensity, a polar relay operable
mentioned polar relay for controlling the effec
tiveness of the second mentioned polar relay, and
means whereby said non-polar relay is energized
simultaneously with said polar relays.
on current of lesser intensity, and a non-polar
relay operable on the same current intensity as
the ?rst mentioned polar relay, armatures oper
able by each of said relays, a plurality of circuits
selectively closable by the armature of the ?rst
mentioned relay, a signal producing device in
each of said circuits, a circuit closable by the
armature‘of the second mentioned polar relay, a
signal recording device in said circuit, a cascade
circuit closable by the‘ armature of the non-polar
relay, a shunt circuit across the armature of the
second mentioned polar relay, and means con
trolled by the cascade circuit for closing the shunt
6. In a signaling system, a single line circuit, a
station having a polar relay in series with said
line circuit operable on current of .a predeter
10 mined ‘intensity, a polar relay connected in‘series
with the ?rst mentioned polar relay operable on
current of lesser intensity, a non-polar relay in
series with ‘said line circuit operable on current
of said predetermined intensity, and means con
trolled by said non-polar relay for rendering the
second mentioned polar relay ine?ective.
7. In a signaling system, a‘ single line circuit in
'
circuit.
‘
ABRAHAM S. BENJAMIN.
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