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Патент USA US2036023

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March 31," 1936:
H. c. ‘CURL ,
Filed June 9, 1933 ' 1
8 Sheets-Sheet l7
FIG. /
FIG. 2 FIG. 3 FIG. 4
F788 F169
FIG. 5 FIG. 6 FIG. 7
March 31, 1936.
H_ c, CURL
Filed June 9, 1935
8 Sheets-Sheet 2
March 31, 1936.
Filed June 9, 1933
88heets-Sheet 3
FIG. 3
March 31, 1936.
H. c. CURL
Filed June 9, 1933
8 Sheets-Sheet 4
March 31, 1936.
|-|_ q CURL
Filed June 9, 1935
8 Sheets-Sheet 5
FIG. 5
. C‘. CURL
March 31, 1936. -
H. c. CURL
Filed June 9; 1933
8 Sheets-Sheet 6
FIG. 6
H. a; CURL
March 31, 1936.
Filed June 9, 1953
8. Sheets-Sheet 7
h’. C. CURL
Patented Mar. 31, 1936
v. ‘2,036,023
Herbert G. Curl, Bayside, N. vY., assignor to Bell
Telephone Laboratories, Incorporated, New
York, N. Y., a corporation of New York
Application June 9, 1933, Serial No. 675,051
5_Claims. (01. 179-1)
This invention relates to announcing telephone
systems and the object of the invention is to‘pro
.vide such a system comprising two or more unit
systems which may be operated entirely inde
5 pendently or as one complete system, as desired.
six groups of receivers 4 to 9. The-second unit
system similarly comprises station 20! and 202,
an ampli?er 203 and four groups of receivers 2M
tov 201. Only one receiver is ‘indicated for each
group but it will be understood that any desired
Heretofore there have been proposed systems _ number of loudspeaking receivers 01'' headsets or
comprising a number of transmitting stations, 2. combinations thereof _may be operated in one
common ampli?er and a' number of groups of group. Similarly, while only two transmitting
loudspeaking receivers selectively controllable
stations are shown in each system it will be obvi- '
from any one of the several stations.
ous from the connections shown and described 10
below how any desiredadditional stations may be
Some of
these systems have been arranged'so that when
one station is using the system all the others are added to the system.
The ampli?ers 3 and 203 have been shown with
. locked ‘out, but in?anv emergency any other sta
tion: may cut in andobtaingjoint (orvsole) control’ ' two conventional stages primarily for the pur
pose of showing the manner of interconnecting 15
of any desired receiver groups; ,
According to the present inventiontwo or more them for combined system operation as described
of these systems are so interconnected that any‘
below. > In actual practice a number of additional
transmitting station may control the' receivers 01'
stagesmay be required.
the other‘systems as well as its own receivers in
O exactly the same manner as if the several sys
tems were originally designed as a single system
having one ampli?er and a number of transmit
ting stations equal to the total number in the
several systems.
More speci?cally this is accom-.
plished by parallelling the several ampli?ers and
providing in each unit system su?icient circuits
for the operation of the total number of stations
and loudspeakers in thecombined system. These
interconnections are preferably arranged to be
made by a single masterswitch so‘that‘ajchange
from unit’to system operation or viceversa can
‘be made without delay.
' .
A further‘ featurev of the ‘invention is vsignaling
means adjacent each receiver so that the opera
35 tor may be requested to repeat the message or be
advised that the message is understood. These
circuits are also interconnected between systems
Ordinarily, a single
common battery would be provided for the entire
relay control system but individual batteries have 20
been indicated wherever necessary, to simplify
the wiring. Station I, which is typical of all four
stations of the two systems, is equipped with a.
transmitter l0, indicating lamps II and l2,-ten
receiver group selective keys I3 to 22 and ten 5
corresponding receiver group indicating lamps 23
to 32.‘ The ?rst six lamps 'and keys at all sta
tions are associated with the six receiver groups
of the ?rst unit system'and the last four lamps
and keys are associated with the four receiver
groups of the second unit system. A non-lock
ing key 33 is'provided for extinguishing the sig
nal lamps whenan announcement has been com
pleted and a locking key or cut-in switch 34 35
enables the stationto cut in its transmitter while
another station is using the system.
_ '
Normal operating priority between the several
to function oneither a unit or system basis.
These and other features of the invention will ' stations is obtained by means of priority relays
4| , 44, 41 and 50, one for each station in the com
40 be more clearly'understood from the following bined system, the operating circuit of each relay
" detailed description and the accompanying draw
ings, in which:
extending through the contacts on the other .
Fig. _ l vis a schematic representation of the
proper arrangement of the several sheets of draw
45 ings in order to show a co-ordinated system;
Figs. 2, 3, and 4 and the upper portion'of Fig. 9,
taken together, show one ‘complete unit system
three relays so that the operation of one relay
disables the other three. Similar priority relays
241, 244, 241 and 250 are provided in the other
system but for separate unit operation only the
two relays in each ‘unit associated with the sta
tions in that unit are operable. When the master
switch ‘200 is closed the operating circuitsof cor
taken together, show a second complete unit sys‘-_ responding relays are in parallel so that one pri
‘ ority relay is operated in each unit system from
tem; and
Fig. 8 shows the master switch for combining each. station of the combined system.
according to this system;
Figs. 5, 6, and 7 and the lower portion of Fig. 9,
the unit system.
The ?rst unit system comprises essentially two
55 transmitting stations I and 2, an ampli?er 3 and
The operation of the system will be explained by
?rst describing the operation of a unit system
and then by showing how the same operating fea
tures are obtained when the units- are function
ing as one complete system.
as already pointed out, the previous operation of
relay 4| has opened the operating circuit of this
relay at contact 58. If the circumstances war
When the Operator of station I has a message
to deliver he inserts plugs 35 and 38 of his trans ‘ rant emergency action he may, however, close his
mitter in the jacks 31, 38 and operates one or
more of the locking keys I3 to I8 according to the
number of receiver groups to be connected. He
then closes the hand operated contact 38 on his
transmitter to complete a circuit extending from
10 ground at the'jack 38 over conductor 48, the
winding of his priority relay 4|, conductor 42,
back contact 43 of priority relay 44 of station 2,
conductor 45, back contact 48 of priority relay
41, conductor 48, back contact 48 of priority relay
15 58 to the grounded battery 5|.
The operation of relay 4| in closing contact 52
completes a circuit for the lamp II at station I
and the lamp I I I at station 2 to indicate that the
system is in use. Contact 53 of the relay com
pletes the operating circuits of the relays 54 and
56 from grounded battery 85 over the conductor
51. The breaking of contacts 58, 58 and 88 of
relay 4| opens the return circuit leading over con
cut-in switch 88, which completes a circuit ex
tending from ground through the switch and con
ductor 88 to the cut-in relay 88 and back to
ground through the battery 8 I. The operation of
the relay 8,8 prepares an operating circuit for the
priority relay 44 independently of contact 58 on
priority relay 4| .so that upon closing the trans
mitter switch 64 the operating circuit for relay
44 extends from ground at the transmitter to the
switch 64, conductor 82, winding of relay 44, to
grounded battery 8|. The operation of relay 44
thereupon operates relays 88 and 81 as before
and connects to the ampli?er 3 any groups of re
ceivers selected at station 2 but not already con
neoted to the system by station I. The operator
at station 2 may then proceed to deliver his emer
gency ,message. Upon the completion of his
message he merely releases his transmitter switch
84 thereby releasing the priority relay 44 and the
ductors 8|, 82 and 63 to the windings of the other
priority relays 44, 41 and 58 respectively. Con-'
tact 58, therefore, disables relay 44 so that sta
transmitter and receiver control relays 88 and 81.
The locking key 88 is also released to release relay
88 and restore the system to normal operating
tion 2 can not operate it in the usual manner by condition.
means of the transmitter switch 84.
Conveniently located with respect to the loud
The operation of relay 54 completes a circuit‘ speakers of each group is a locking key and a
from the transmitter I8 over conductors 88 and non-locking key. If a message delivered to re 30
81, through the contacts on the relay to the con
ceiver group 4, for example, is not understood, the
ductors 88, 68 leading to the input circuit of the non-locking key 83 is closed on contact 84 to oper
amplifier 3. The operation of relay 58 operates ate the signal lamp relay 85 over a circuit extend
the receiver group selecting relays 18 to 15 by ing from ground, conductor 88, winding of the
35 completing at contacts 18 to 8| the circuits pre
relay, conductor 81, back contact 88 of relay 88 35
viously prepared by the closing of the keys -I3 to
to grounded battery. The operation of relay 85
I8 at the transmitting station. In order to obtain
the same volume level irrespective of the num
ber or receiver groups connected to the ampli?er,
these relays 18 to 15 are equipped with substitute
lights lamp 23 at the transmitting station over an
obvious circuit. The key 88 is then released to
load resistors suchas 82 which, when connected,
introduce a loss in the system equal to the power
consumed by the loudspeaking receiver group as
sociated with the relay. The operation of these
relays disconnects these substitute load resistors
and connects the output leads 83, 84 of the ampli
?er directly to the receivers. The transmitter I8
is then connected to the receivers and the opera
tor proceeds to deliver his message over the con
ductors 88, 81 and 88, 88 to the input of the am
pli?er 8 and from the output of the ampli?er over
the conductors 83, 84 to the receivers.
If station'2 desires to use the system when it is
" not already in use a similar series of operations
take place, that is to say the transmitter of‘ sta
tion 2 is connected to vits jack and the receiver
extinguish the lamp and then reclosedv to relight
it repeatedly as a signal that the message has not 40
been understood. The operator will then repeat
the message and when it has been understood the
key IN is closed to operate relay'85 over a circuit
extending from ground, the back, normally closed
contact of the key 83, cond‘uctor I82, key "I, con 45
ductor 88, winding of the relay to grounded bat- ‘
tery. The operation of the relay closes contact
I83 to maintain the operating circuit of the relay
independently of the key I8 I. This maintains the
lamp 28 lighted as an' indication that the message 50
has been understood.
When the message has '
been understood by all the, receiving operators
and the station operator is disconnecting his sta
tion from the system as previously described for
station 2, he also momentarily closes his key 88 55
at the station to operate relay 88 and open con
group selecting keys corresponding to the desired ‘ tact 88 which releases relay 85 and any other sig
receiver groups are operated to prepare the op
nal lamp relays which have been locked up.
erating circuit of' the receiver group selecting
relays 18 to 15. The closing of contact 84 on the
transmitter operates priority relay 44 which lights
the lamps II and II I, as before, opens the operat
The operation of stations MI and 282 is identi
cal with the operation of stations I and 2 already
described so that for unit operation of the system
no detailed discussion of the circuit of the second
ing circuits of the other three priority relays unit system need be given.
and closes contact 88 to complete the operating‘
When it is desired-to operate the two units as
circuits of relays 88 and 81. The operation of one combined system, the master switch 288 is
relay 88 connects the transmitter talking circuit moved to the left to make the necessary addi
to the conductors 88 and 88 leading to the input tional interconnections between the systems.
of the amplifier 8 and the operation of relay 81 Many of the interconnections which do not inter- '
completes the operating circuit of the selected re
fere with the normal operation of the unit system
70 _ceiver group selecting relays. If, however, the may be permanent, as, for example, the connec 70
system is already in use by station .I when the tions between the contacts of the receiver control
operator at station 2 desires to make an announce
relays 58. 81, 288 and 254 and between receiver
ment, he is advised of ‘that fact‘ by his lamp III group indicating lamps 23 to 32 and the corre
but if he ignores this lamp and closes his contact sponding lamps at the other station. The return
75 84, he can not operate his priority relay 44 since, circuit for the lamps 28 to 82 and the correspond 75
ing lamps at station 2, both of which relate to the
’ receiver group in the second unit system, extends
to ground through contact 2I8 of the switch 200
so that for unit operation contact 2I8 is opened
and these lamps will not be lighted when the
answer-back signals are being sent to stations 20I
and 202. Similarly, the return circuit of the ?rst
six lamps at stations 20I and 202 extend to ground
through contacts 263 to prevent signals intended
for stations I and 2 from appearing also at sta
tions 20I.and 202. It will be noted that for unit
operation the output circuit of the‘ vacuum tube
I04 of the ampli?er 3 is shunted by a resistor I05
overa circuit including conductor I06, contact
I01 of the switch 200, the resistor I05 and con
the signal lights 29 to 32 in the station I and
the corresponding lamps are now connected to
ground on one side by conductor 2I9 and con
nected in parallel with the corresponding lamps ~
in stations 20I and 202 by conductors 230, 230,
240 and 242, they may be operated for signal pur
poses from the receiver groups 204 to 201 in the
same manner as the corresponding lamps in
stations 20I and 202 when these receiver groups
are energizedfrom one of the stations in that unit
. system.
In an emergency the operator at station 2 may,
by means of the switch 08, cut in his transmitter
‘in exactly the same manner as for unit operation
and either station 20I or 202 may also cut in in a 15
ductor I06. Similarly, the output circuit of the
similar manner. For example, the operation of
vacuum tube I09 of the ampli?er 203 is shunted the switch 25I completes a circuit forcut-in
bya resistor I I8 over a circuit including conductor relays 252 and I52 extending from the switch,
I I6, the resistor, contact I I 3 of the switch 200, and
conductor 253_to grounded battery 254 through
relay 252‘ and over conductor 255, contact 256 20
20 conductor II4. When the master switch 200 is
moved to the left contacts I01 and I I3 are broken - of the master switch, conductor I53 to grounded
and the ampli?ers 3 and 203 are paralleled be
battery I54 to relay I52.
tween their stages over the following circuit.
The operation of relay I52 completes a circuit
From the plate of tube I04 over'conductor I06, for priority relay “41 independently of contact
contact I I5 of the master switch, conductor I I6 to v 59 of relay 4|, extending from battery I54, wind 25
the plate of the tube I09 in the ampli?er 203. The ing and relay 41, ‘conductor I55, contact I56 of
plate circuit returns are also paralleled over a the master switch, conductor 243 to ground
,circuit extending from conductor I08 in the- am
through the transmitter switch 239. The opera
pli?er 3, contact II1 of the master switch to con
tion of relay 41 lights lamp I2 and H2 in stations
30 ductor I I4 leading to the ampli?er 203. 'Under
I and 2, respectively, over a circuit extending from 30
this condition, any messages transmitted to either grounded battery I51, conductors I58 and I59.
of the vacuum tubes I04 or I09 will be transmitted through the lamp to conductor 2I9 and ground
to the output circuit of both the ampli?ers 3 and at the master switch. These lamps give an indi
203 to energize any of the selected groups of re
ceivers in both systems. The resistors I05 and
H8 are of such value that when the ampli?ers
are parallelled and the resistors disconnected,
transmission is not affected.
If the operator at station I now operates his
40 priority relay 4I_ to lock out station 2 in the man
cation at stations I and 2 that one of the stations
20I or 202 is using the system. The operation of 35
l‘elay 252 operates relay 241 independently of the
relay 24I which has already been operated by
station I, over a circuit from battery 254, through
the relay 241 to ground through the transmitter
switch ‘ 239.
In closing contact 251, relay 241
ner already described, the priority relay MI in operates relay 258 to connect‘the transmitter
the other unit system will also be operated over 259 to the ampli?er 203 and relay 260 to prepare
a circuit extending from conductor 40, conductor operating circuits for the selecting relays of any
208, contact 209 of the master switch, conductor desired receiver groups not already connected by
2 I0, Winding of the relay 24I, conductor 2I I, con
station I. Station 201 may then proceed to de
tact 2I2 of the relay 244, conductor 2I3, contact liver a message to all the selected receiver groups
2I4 of the relay 241, conductor 2I5, contact 2I6 and when ?nished disconnect his station from
of the relay.250 to grounded battery 2I1. The the system as already described for station I.
. operation of relay 24I opens the operating circuit
When it is desired again to use the system as two
of the relays 244, 241 and 250 so that stations 20I
independent units it is only necessary to restore
and 202 are also locked out. Station I may then the master switch to the position shown and the
proceed to ‘select any or all of the ?rst six loud
combined system is immediately reconverted to
speaker groups associated with'his system and, 7 two independent systems with their original oper
in addition, one or more of the four groups asso- j ating featuresr
ciated wtih the other unit system. For example,
‘he may close all ten keys I3 to 22.
The receiver groups 4 to 9 will be selected in
the manner already described and in addition the
closing of keys I9 to 22 ,will select the receiver
60 groups 204 to 201 in the following manner: A
circuit is made from ground at the master switch
It will be seen from the foregoing description 55
that for unit operation lamps II. and-III are
lighted when either station I or 2 is operating
and lamps 245 and 248 are lighted when either.‘
station 20I or 202 is operating.
For the com
bined system operation, lamps II, III, 246 and 60
249 are lighted when either station I or 2- is
through contact 2I8, conductor 266, keys I9 to ' operating, and lamps I2, H2, 245 and 248‘ are
22 over all four conductors 2I9 to 222, through
the upper four contacts of the relay 56 which has
‘lighted when either station 20I or 202 is oper
65 already been operated to conductors 223 to 2.26
system is operating, both lamps at all four sta
When one or more stations of each unit
and conductors 221 to 230 toggrounded batteries ' tions will be lighted. If, for example, the operator
through the relays 23I to 234. The operation at station I ?nds his‘lamp II lighted, it is an
of these relays disconnects the substitute load indication that station 2 is already operating; if
resistors and connects the loudspeaker groups 204 lamp I2 is lighted, he knows that one of the
7.0 to 201, through the conductors 235 and 236 to
stations'of the other unit is using the combined 70
the output circuit of the ampli?er 203. By virtue
system and if both lampsare lighted, he knows
of the parallel connection between the ampli?ers
that both station 2 and one of the stations in
the other units are using the combined system.
While-the invention has been described with
these receiver groups will then be energized by
messages sent from station I simultaneously with
75 the receiver group in the ?rst unit system. Since
reference to a. particular circuit for purposes of 75
illustration, it will be understood that various
changes may be made within the scope of the
following claims.
What is claimed is:
1. In an announcing system the combination
with at least two normally independent unit sys
tems each including a plurality of transmitting
stations, an ampli?er, a plurality of receivers,
means at each of the stations for connecting the
stations and the receivers to the ampli?er, means
operated when one of the stations is so connect
ed for disabling the other station, and emergency
means at each station operable while,the station
is disabled for connecting it to the ampli?er, of
15 cross connections between the unit systems and
a switch therein for effectively combining the
unit systems into a single system in which each
transmitting station may control all the receiv
ers in the same manner as it controls the re
20 ceivers in the corresponding system when operat
ing as an independent unit.
2. In an announcing system the-combination
with at least two normally independent unit sys
tems each including a plurality of transmitting
25 stations, a priority relay in each system for each
station in all the unit_systems, an operating cir
cuit therefor, an ampli?er, a' plurality of re
ceivers, a receiver-control relay for each receiver
in all the unit systems, an operating circuit there
30 for, means at each station for operating the cor
responding priority and receiver-control relays
3. In an announcing‘ system the combination
with a plurality of transmitting stations, an
ampli?er, a plurality of receivers, and means at
the stations for selectively connecting the re
ceivers and the stations to the ampli?er, of a
plurality of indicators at the stations, means at
each receiver for operating an indicator at each
station, and means at each station for resetting
operated indicators.
4. In an announcing system, the combination 10
with at least two normally independent unit sys
tems each including a plurality of transmitting
stations, an ampli?er, a plurality of receit .;1'S,
means at each of the stations for connecting the
stations and the receivers to the ampli?er, and
van impedance normally connected in shunt to
the ampli?er, of cross connections between the
unit systems, _a switch therein for e?ectively
combining the unit systems into a single system,
and contacts on the switch for paralleling the 20
ampli?ers and disconnecting said impedance.
5. An announcing telephone system compris
ing at least two normally independent unit sys
tems each including a plurality of transmitting
stations and a plurality of receiver circuits se
in each unit system for each station of all the
unit systems, an operating circuit for each relay
extending through the contacts of each of the
other relays of the unit system, and controllable 30
from the corresponding station, means respon
sive to each priority relay for completing a talk
ing circuit between a transmitting station and
selected receiver circuit, and means for combin
said priority relays for opening the operating cir
35 cuits of the other priority relays, of cross connec
ing the unit systems into a single system com
tions between the unit systems and a switch‘ prising a switch and contacts thereon paralleling
of said unit systems to connect the stations and
the receivers to the ampli?er, and contacts on
therein for paralleling the ampli?ers and the
operating circuits ‘of the corresponding priority
and receiver-control relays of the several systems.
lectively controllable therefrom, a priority relay
the talking circuit and the corresponding priority
relay of the unit systems.
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