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Патент USA US2110312

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March 8, 1938.
2 1d, 1 0 3 11 2
Filed May 17, 1935
5 Sheets-Sheet 1
1 im. Y‘ 9 R4 '
W/tnesses :
March 8, 1938.
' '
Filed May 17, 1935
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i 3,
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3 Sheets-Sheet 2
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March 8, 1938.
Filed May 17, 1935
s Sheets-Sheet s '
Patented Mar. 8, 1938
Adalbert Szilard and Georg Keleti, Budapest,
Application May 17, 1935, Serial No. 22,09!
In Austria May 23, 1934
8 Claims. (01. 179-6)
‘The invention relates to an arrangement for be produced in line 3 of subscriber B, and there
telephone systems suitable for automatic con
by, according to the invention, device 2 is in
nection of calling subscribers A with a central ?uenced in such a manner that a calling sub
message oilice in case the called subscriber B is not scriber A is connected automatically to the mes
sage o?ice and the interchange of messages is
5 available to answer the call, permitting the inter
change of messages in both directions by means of made possible either over the operator's set N or
simple auxiliary devices disposed- at the sub
by means of automatic speech or signal record
ing and reproducing apparatus Z. According to
scribers B and of a combined switching and in
dicating device, common for a group of such the invention, for each message chosen by B
subscribers B.
from a plurality of stereotype messages to
Arrangements for similar purposes are in use, be transmitted to calling subscribers A, there
but these known arrangements do not allow the is a corresponding predetermined different
subscribers B to send messages to the calling sub
manner of operation of device I, causing corre
scribers A without a previous call of B to the sponding peculiar current and voltage conditions
message o?lce. In these known arrangements the in line 3 and a corresponding manner of in
recording of these messages in the message o?lce ?uencing device 2. The manner in which device
requires a great amount of operator's work, fur
2 has been in?uenced is observed by the operator
thermore they have the drawback of compara
at N who transmits the corresponding stereotype
tively high ?rst cost for each subscriber and in message to the subscriber A or this message is
so some cases of considerable power consumption communicated automatically, according to the
even during the time of no conversation.
manner in which device 2 has been in?uenced,
On the other hand, the arrangement according by means of apparatus Z in form of signals or
to the present invention is such that frequently speech reproduction. Transmission of messages
wanted, stereotype messages of the subscriber B which are not stereotype addressed by B to A and
recorded beforehand, and the recording of mes
25 which he desires to be transmitted to all sub
scribers A calling him, are neither to be com
sages addressed by A to B, are effected either
municated beforehand to the message o?lce, nor by operators or by automatic recording and re
to be recorded there and to be selected from these producing apparatus Z. As shown hereinafter,
records in case of a call of a subscriber A. The for communications between B and the message
stereotype message set up by B is automatically office a direct connection over device 2 and line 3
indicated to the operator of the message o?ice may be used without any cooperation of the nor
simultaneously with the call of subscriber A or the mal switching apparatus of the exchange.
message is transmitted by means of suitable re
An embodiment of the invention is shown in
producing apparatus in a fully automatic manner. Fig. 2. A is the calling subscriber, B the called
In the ?gures of the annexed drawings
subscriber, VA the automatic telephone ex
Fig. 1 shows diagrammatically, the arrange
change, to which B is connected, I the auxiliary
ment in principle of an apparatus according to device at B, 2 the common switching and indi
the invention,
cating device for all subscribers of the same ex
Figs. 2 and 3 each illustrate an embodiment, change VA.,and a and b the two wires of line 3
shown by way of example, of an apparatus accord
of subscriber B. The auxiliary device I comprises
ing to the invention,
in this case the switch 8 and a variable alternat
Fig. 4 shows the detail of a further arrange
ing current resistance, composed of a variable
ment, in principle, and
Figs. 5 and 6 illustrate details appertaining to condenser K and a variable induction coil W;
the embodiment shown in Fig. 2 and in Figs. 2 for each stereotype message of B a ?xed value of
45 and 3, respectively.
the A. C. resistance is allotted with ?xed values
The idea of the invention is best explained by of K and W. The wires (1 and b of subscribers B
reference to the diagram shown on_ Fig. 1. An are connected to corresponding contacts of two
auxiliary device I is provided at subscribers B, contact banks of finder Sr, having three wipers.
this device being operated by B, if he desires that The primary windings of transformers T are ar
subscribers A, calling him thereafter, shall be ranged in wires b‘, whilst one end of the secondary
connected to the message o?lce. There is also windings is grounded and the other end is wired
to the third contact bank of ?nder S1‘. The ?nd
a central combined switching and indicating de
vice 2, common for a group of subscribers B. er is permanently driven by the stepping magnet
By operating the auxiliary device I, peculiar pre
5Ol determined current and voltage conditions may
M1, as long as there‘ is no incoming call for a
non-answering subscriber B.
When a call is 55
cannot follow the quick vibrations of the bullet, ‘
“switch 8, thereby disconnecting his subscriber's in consequence whereoi it remains attracted dur- ‘
set'and connecting up his auxiliary device I, a ing the time the buzzer is working. As soon as,
made, to a subscriber'B who has operated his
ringing ‘current of less intensity will result, the the ?nder Sr reaches ‘the line of B, relay R1 is
resistance oi device I at the frequency of the ring
energized by V, operates and opens at 1'- the cir-i 5
ing current being greater than that of the sub
cult of the stepping magnet M1 or ?nder 81', and
scrlber's set. As soonas the ?nder sr reaches" as aresult Sr stops. R1 locks. up through Ta and
the contacts oi B. the ringing voltage ls‘trans
m and extends the wires [a and below '1‘. and n
‘mitted by wipers'Sa‘ audit) to ‘the ampli?er V1 This done, relay R2 operatesby r: and the mew
10 and in its output circuit relay R1 will operate. At
subscriber ._B, the wire a being earthed in VA.__ Rs 10
the same time ampli?er Va is also in?uenced by closes at r: the circuit 6! sté
of “
transiormer T and wiper St, but relay. Rs in the vanin'dicator dial Scmm operates, Sch makes a‘
output circuit oi ampli?er V: does not. operate, ‘ step; and 4M3‘ grounds vwire b'by contact I, in
this latter being adjusted to operate only it the
15 normal ringing current is ?owing in wire‘ b. .In
this way relay R: is energized by hand a, oper
matesand opens at rm the circuit 01' magnet M1,‘
and in consequenoethereoi ?nder Sr stops. R:
locks up through Tu, and wires 0 and b are'ex
‘tended by r. and'r‘s. after having been momen
tarily short-circuitedduring switching at vthe pre
' contacts 1'" and-n"; so u‘ to bring the apparatus
consequence whereoi magnet M of device. I is,
released and the ratchet wheel K1 makes a step
accordingly. Magnet M: comprises a self-inter
rupter; not shown .in the. ?gure, which opens the
energizing circuit as soonasthe armature has]
been attracted, therefore M; ialls back aiter each
attraction. ‘This play oi Ma and M is repeated.‘
‘until the rotation of‘ ratchet wheel K1 is limited
by the stop An. Then the‘ratchet wheel K1 re,
in the 'exchange'iVA' into the'talking position. turns to its normal position under action oi a
Finally the circuit oiustepping‘ma'gnet Ma oi se-j spring, not shown on the ?gure, tensioned during
lector We. is closed atrm. Selector Wagrotates the stepping of K1 and released by An; drop lie
anew its wiper Wt successively connects diiier
at the‘ same time ‘restored
ent oscillatingcircuit 81s to the grid of oscillator 7. the loop of subscriber B','i. eithe circuit oi Rs, '
tube Sefeach frequency of the oscillator tube cor- _' is'opened. and in consequence‘m cannot be ener- '
responds to ‘a ireouency tuned up by. a" certain set
glzed again. .“Dlal sch stops aitera's many steps
‘tingoi device 'I. 'As soon as the sameireql'sency‘ as the. ratchet wheel K1 waslallowed ‘to :periorm 30
is sent which corresponds to‘ the setting of device bythe adjustablestop An. 1 Contact K: which is
I. these results a resonance current in‘ line‘ '3 open only in the normal position oi dial Bob, is
which operates relay R4, by transiormer T; and nowclosed and relay Rois energizedby the back
v1h. This relay opens thecircuit oijmag
not H: at run; selector We stops and R4 locks up
through nu. The operator's set Nand at the same
time one oi the talking machines Z areconnected
up atrn and by wiper We respectively. [Each oi
the talking
transmits one’ of the stereo
. ‘contact 1'2, disconnecting; R: from wire b at 1's and
extending wiresa and b along rs. and Ta to the .
operator's set N. ‘Now the operator can read the
stereotype message indicated by‘the: position 0!
dial; Sch and recognizes, from the position ‘oi ?nd!
. er Sr, which subscriber has been called. . After
‘messag'esi and these
machines are * the communication and reception of the messagq
‘connectedtto the contacts oi the arc oi move
the operator‘presses key.'1‘r,thereby mechanical
’ ment of the wiper We in ,the'proper sequence, so ly releasing dial. Sch. which returns to normal
' that‘the caller has transmitted tom the mes
position under action oi a spring“ Relay‘ 86 I
sage which corresponds" to the manner in ‘which energized by-the iront contact. oi
theauxiliary device has been operated. The talk-‘ ' locks up through contacts rlsand Tu; ‘Assets:
thus transmits to subscriber _A any , as dial Sch has reachedits normal position, on
message set on‘device. I, thevoperator
communicates the special non-stereotype mes
‘jsage are andrecords the‘message oi A addressed
the operator presses'the key Tr,
device I and the operation may
circuit of relay R: is ,opened at contact Ks, then ‘ '
.R: releases, the operator’sset is disconnected, and‘ - ‘
the-locking clrcuitoi’R-eisopened at
oi R1 is opened at run'l‘he circuit oi H1 is closed ‘so
again-Vat’ rm. Finder Br moves on and the whole
operation .is repeated as soon as itreaches the
bodiment is shown in Fig.3, The 'line oi another subscriber who may be called
auxiliary device iconsists
oi anal-V and 'who does not answer.
' ‘thereuponbe repeated as described. :- .
" ternating currentdropF,connectedacrosswires
"Inthe cascoibotharrangements
sand I; in series with a condenser K, and oi a‘ employment or individual relays ior each sub
buzsensu in series» with ‘a stepping magnet it
connected also-‘across the wires sand b as soon
as the drop F ialis. 'l‘he stereotype message is
set up by adjusting stopaAnrensasinse s-ywith
scriber for the device 2' has been" avoided.’ this
beingrendered possible by‘the employment at
the ampli?ers described. by means oi which the
signals arriving from the-‘various lines are trans
a cam‘disc, thereby allowing a ratchet wheel Kl -mitted toI the common relays. Arrangements”
' driven by magnet M and» keyed“on a common
are, however, also possible, which do not require
shait- with‘ the cam disc.’ to rotatea certain'num
any ampli?er but‘require the employment (I in-_‘
'ber oi steps corresponding to the serial‘ number dividual relays iorv each‘ subscriber; ' ' , , '
oi the message. Device 1. comprises a ?nder Sr
ew'ith two wipers. ‘The wires 4 and b oi sub
I scribers 'B are connected to the contact banks, oi
Sr. Wipers Ba and 8b are connected by back
contacts of R1 to thefinput terminals oi a'gband
- The action oi the 'auxiliary‘device I by which
it connects A withv device land the‘ signal'trans- ‘
mission‘ between devices I and I i. e.v the kindle!
peculiar current and ‘voltage conditions, caused
by device'ilin linel, may be di?erentirom those
pass ampli?er V tuned to the irequency oi buzzer ~~oi the embodiments ‘described above. Borea 70
Thewindingoirelel?iisconnectedtothe ' ample, device 2 may be influenced by varying:
V. when
B the intensity, V'irequency, phase,‘
or ,
_ ' been closedandB is called.drop1" iallatmder
action oi the ringing current!
" ‘
somelother characteristics oi‘the ringing‘tl' food;
current, or by supplying'currents or
I 9,110,812
are in?uenced by device I and affect device 2
over line 3 accordingly.
According to the invention the operation of the
switching and indicating device 2 may be made
invention, provision can be made for a number
of stereotype messages different for each sub-.
scriber B, e. g. communication of the directory
numbers, at which he may be reached at the time
being. In this case the selection 01 the meaning
of various readings of device 2 for each subscrib
er B from records by the operator may be avoid
ed by the use of a combined indicating apparatus
acting in a well known manner.
In the message omce provision is to be made for for this kind of messages-stereotype for anyone
subscriber B, but diiferent for different subscrib
10 one or, depending on tra?lc requirements, more ers B--the indications thereof being dependent 10
o?ice lines for communication with subscribers.
According to the invention a direct connection not only on the particular subscriber B who was
over lines 3 and device 2 may be used for the called, but also on the setting of the called sub
communication between subscribers B and the scriber’s device I. Such a combined indicating
apparatus is shown in Fig. 6. Wiper S11 is ?xed
15 message o?ice, without the cooperation oi.’ the on the shaft of the finder Sr whilst wiper S1: is 15
switching apparatus of exchange VA whereby a
certain manner of operation oi! auxiliary device ?xed on the shaft of the disc Sch as in Fig. 3, so
i may set up a direct connection with the op- ' that wiper 811 will switch the indicator lamp of the
called subscriber, whilst wiper SI: will switch the
erator’s set N over line 3 and device 2. For ex
indicator lamp corresponding to the serial num 20
of the message. Thus the message *to be
effected by directing the buzzer's tone from the
auxiliary device I over the resistance W1 and transmitted may be read at the crossingpoint oi
switch S1 in Fig. 5 to the line 3, thereby causing the row and column marked by lit up lamps.
Having now fully described and ascertained our
device 2 to stop on the respective line I and to
automatic in a greater measure than described as
above e. g. by using for recording oi the messages
of A addressed to B speech recording apparatus
said inventionand the manner in which it is to be
‘performed, we declare that what we claim is:
scribed above.
1. A telephone system for the interchange of
According to the invention an additional device
may be provided at B which indicates if B has messages between calling and non-answering
been called during the non-answering period, in called subscribers, comprising a message o?ice,
30 order to induce B to inquire at the message o?ice: an auxiliary device at‘the called station operable
Furthermore the calls may be registered at B or to produce predetermined di?erent current or
voltage conditions in the called line, means for
in the message o?ice by means of metering de
setting said auxiliary device to operate in a se
vices e. g. for accounting purposes, or the time
of engagement of device 2, of the operator, or of lected manner, a signal operable in predeter
mined di?erent ways corresponding to the diii’er
35 apparatus Z may be recorded continuously and
ent- settings of said auxiliary device, switching
separately for each subscriber.
and indicating apparatus common for a group 0!
During the time when device I is in the non
subscribers and responsive to said different
answering condition, the bell may be left con
nected, possibly with a weaker tone, in order to current or voltage conditions, and means con
trolled by said apparatus ior connecting the call
40 make B cognizant of the call, should he have
25 establish the connection to N in the manner de
forgotten to restore his device I into the answer
ing condition. By these means the operator is
enabled to give a special ringing signal to sub
scriber B in urgent cases and in those which have
45 been previously pointed out by B or marked as
desirable by setting his device I accordingly.
According to the invention it the trafiic with
the message office is very intensive, further
switching and indicating devices 2' shown in
50 Fig. 1 may be employed for the same group of
subscribers, in which case provision should be
made in ways for avoiding double connections.
On the other hand, certain parts of the switch
ing and indicating device may also be common for
Q1 iii various groups of subscribers, as shown in Fig. 4.
In other cases, when the tra?ic is moderate, as
at night, etc. the service-oi! several devices 2 serv
ing di?erent groups of subscribers (e. g. in dif
ferent exchanges VA) may be combined; in this
60 case some parts of device 2 will be situated at a
considerable distance from the others and con
nected with them over trunk lines. In such cases
such indications oi.’ device 2 which cannot be
read directly, are to be transmitted to the op
65 erator over trunk lines-in known manner.
In order to accelerate operation, according to
the invention, lamp indicators working in well
known manner may be used for the indication of
the positions.
A certain part of the stereotype messages will
70 be the same for all subscribers B, e. g. the cause of
failure to answer: absence, nighttime etc.; fur
thermore certain limitations of answering, e. g.
only for toll calls; ?nally the time of the next‘
reply condition and the like. According to the
ing subscriber to the message office and for ac
tuating said signal in accordance with the setting
of said auxiliary device.
2. A telephone system for the interchange of
messages between calling and non-answering 45
called subscribers, comprising a message o?lce, an
auxiliary device ‘at the called station operable to
produce predetermined di?erent current or volt
age conditions in the called line, means for set
ting said auxiliary device to operate in a selected 50
manner, a signal operable in predetermined dif
ferent ways corresponding to the different set
tings of said auxiliary device, switching and in
dicating apparatus common for a group of called
subscribers and including?nders responsive to '
the di?erent current or voltage conditions in a
particular called subscriber’s line, and means
controlled by said apparatus for connecting the
calling subscriber to the message omce and for
actuating said signal in accordance with the
setting oi said auxiliary device.
3. A telephone system as set forth in claim 2,
said ?nders comprising parts adapted to move in
a step-by-step manner.
4. A telephone system for the interchange of 65
messages between calling and non-answering
called subscribers, comprising a message oince,
an auxiliary device at the called station operable
to produce predetermined dii’i'erent current or
voltage conditions in the called line, means for 70
setting said auxiliary device to operate in a se
lected manner, a signal operable in predetermined
different ways corresponding to the different set
tings of said auxiliary device, switching and indi
cating apparatus common for a group of called 75
" 4
‘ subscribers and responsive’
dlilerent cur-‘w‘f‘tlihfl; In a telephone system, an unattendedsub
rent‘ or voltage conditions, and means controlled
by said apparatm i'or connectingthe calling sub
scriber to the‘ message once and for, actuating
sc?ber’sstation, a subscriber's set,» a message
storing. and. -se'nding device having a'plurality
voi? possible settings corresponding to ,diilerent
ma signal in accordance with the setting .0! said predetermined stereotype ‘messages and connect
auxiliary device; ma switchingapparatus com
prising an amplifier responsive to said diiierent
,current or voltageconditions, and undermin
?uenced by said ampli?er, said ?nders compris
10 ing parts adapted to move in a step-by-step man
, ner.
; 5. Aatelephone
abie to
subscriber'sllinean operator's posi
tion, ‘an operator's set,‘an,indicating device ‘at
said operator's comma switch having accessto ‘
incoming to, said subscriber’s
line and y?respons’iverto
line for ‘completing T
connection between the calling sub
m the interchange oi .aftalking
scriber and-the operator'at said position and
I messages between calling and 1_ non-answering
simultaneously establishing a signal‘ transmis
sion over said‘ subscriber's line between said mes
auxiliary device at the called station‘ operable sage-‘storing and -sending device and said indi 15
111s .;an‘
to produce predetermined ‘diilerent currentor cating device. '
voltage conditions in the called line,
vii. In‘ a ‘telephone system, an unattended
‘setting said auxiliary devicegtooperate in a se
scriber’s station, a subscriber's set, amessage
, lected manner, a signal operable in predetermined storing and -sending device’having a' plurality
d'lil'erent ways corresponding to thedi?ferent set.
01’ possible settings . corresponding to diilerent
wtin‘gs oi’ said auidliarydevice. switching and indi-r predetermined stereotype messages‘ and’ connect
‘cating'apparatus ‘common for a group ofecalledr able to said subscriber's line, an operator's posi
subscribers and responsive to said diii'enent cur
tion, an‘ operator'sset; an indicating device at
rent or voltage conditions, and means controlled said positloma switch having access to said lub
by said' apparatus for connecting, the calling sub
scriber's‘line and responsive to a-call incomingto
scriber ‘to the message omce and Ioractuating I said line for; completing a talking connection be 25
"said signal, in accordance with thesetting of tween the calling subscriber and the operator at
said auxiliary device; said switching apparatus said position and simultaneouslyestablishing a
comprising‘ a ‘means responsive to said diiierent ', signal transmission over said subscriber's line be
current ‘or voltage conditions, and ?nders‘ in
tween said message-storing and -sending>device so a
called subscribers, comprising a messageo?ice,
?uenced by, said‘means, said ?nders comprising '
‘and said indicating device,said message-storing
, parts adapted to move in a stepqby-step manner. i and ‘-'sending device and said message-indicating ‘
' ' 6. In a telephone system, .the combination with
Y " the elements set forth in claim-1' oi’ an indicating
35 device associated with said switching apparatus,
and means for automatically causing said indi
cating device to function so as to indicate ‘which
particular subscriber has been called.
device both comprising parts movable in a step
by-step manner and adapted to operate Iin'syn
chronism it connected one-to the other over said 85
subscriber's line.
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