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Патент USA US2108437

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Feb. l5, 1938.
Filed Nov. 23, 1935
Patented Feb. 15, 1938
‘ Unirse STATES ’PT
Alfred Heyduck, ‘Berlin-Neuenhagen, Germany,
assigner to Mix & Genest Aktiengesellschaft,
Berlin-Schoneberg, Germany, a company
Application November 23, 1935, Serial No. 51,252
In Germany November 28, i934
`6 Claims. (Cl. 179-18)
This invention relates to automatic or semi
automatic private branch exchange systems with
“intermediate call” facilities whereby a subscriber
of `a P.‘B. X. `station whois talking with an outside
exchange subscriber `can temporarily free his line
for another call while holding the outside call,
and can later resume the outside call. '
In known arrangements of this kind,' a key at
PA pulls up and with its contact pal short-cir
cuits the high resistance .portion of its winding,
whereby the calling subscriber is blocked in known
manner against the hunting of all selectors.
Contact paII breaks the circuit of the call iinder,
so that fkthe switching arms of AS will stop at the
segments `oi the calling subscriber. Contacts
PaIII and pctIV switch the talking wire through,
so that relays AH and BH can pull up over the
subscriber’s loop, i. e. over station N. Contact IO
altIII closes a circuit for VAI-I over yhI, ahIII,
from the‘outsíde exchange line, while connecting ' VAH, -«. Instead of contacts paIII and paIV,
it tothe selectors of a local trunk, the outside' - contacts cwhï and tahII close the circuit to the
‘connectionrbeing maintained at that time in a subscriber. Contact odhIII switchesthe positive n
well-known manner. The user of Asuch a P. B. X. pole directly to the c-wire, so that relay PA re
station can in this way make an intermediate call leases; ` In the local trunk contact ochV had
to a. subscriber whose station is’connected to the switched the starting chain onto the next free
A P. B. X., but he can not make an intermediate call local trunk. , With this operation relay EH has
the P. B. X. station is pressed in order to ground `a
wire ofthe subscriber’s line and thereby to ener~
gize a'relay` that acts todìsconnect this station
to‘another outside exchange subscriber, that is to
released and has therefore opened its contacts
say, can not make an intermediate .call over the
chl and vehII.
main exchange.
"Facilities -for intermediate ‘call over the main
exchange are provided in the arrangement de
scribed hereafter by way of example, reference
beingY had to theY accompanying drawing, that
diagrammati'cally shows a private branch ex
change system consisting of local trunks or links
AS~-LW and outside exchange trunk equip
ments AW. Only one local trunk and one out
30 side trunk are shown. N denotes a subscriber’s
set. Relays are designated by capital letters,
their contacts by the respective small letters.
A.-Loccl calls within P. B. X.
„Uponlifting the receiver, relay R,’be1onging to
station N, pulls up:
_, wiz, r11, N, tlv, RI, + ‘
Relay NH is energized over contacts TIII and tIV
and atits contact nhl it closes the circuit for the
relay EH of a free local trunk or link. Contact
ehII closes an obvious circuit for the call-finder
magnet ASM.
Contact ehI closes a circuit which
extends over the test wire to energize relay PA
as follows:
of this relay, y Relay VBH is retarded against re
now again permanently established.’ With the
release lof VBH, suitably built contacts 'UbhIV and
obhHI thereof are operated consecutively, so that
potential is temporarily switched on the windings
of PL. This establishes the test circuit, in which
relays R and T of the desired subscriber are en
ergized over their windings II. Relay PL pulls
up and short~circuits the high resistance portion
of its winding, so that it blocks in known manner
the called subscriber against engagement over
It holds over its low resistance
winding II .and contacts plIlI, oahIV. Contacts
plI and plII switch the talking wires of the house
connection set through to switching arms c and
h of line selector LW; Call current is now trans
tact lrII switch off the windings and resist
mitted periodically into the line to the called
ances Wil, RI, .TI which were connected with
party from a source of alternating current, so that
the-talking path >during the calling condition.
NH is also `deenergized over Contact IÍIV. Relay
lease and consequently remains pulled up during
the impulse series, as does relay VAH. Contact
altI energizes line selector magnet LWM over
Dahl/'II according to the number of impulses
given, so that the line selector turns its switching
arms a, b, c the desired number of steps. At
the end of the series of impulses, relays AH and
BI-I remain again permanently pulled up. Relay
VBH releases at the end of its retardation pe
riod because the short circuit of its winding is
other selectors.
lIn this same test wire circuit the windings
II `of relays R and T of the subscriber are
energized. Contacts tII and tIII as well as con-k
Relays AH and 'BI-I swing with the dialing. In
this operation only those circuits become effective
which are joined with the contacts of relay AH.
Relay VBH pulls up during the series of impulses;
because contact ahIII removes the short circuit l
the ringer will operate there. The call current
.flows through the windings of relay YH, which
however can not pull up because its Winding II
is short-circuited through vbhII. As soon as the
called subscriber lifts the receiver, a direct cur
rent circuit is closed over the subscriber’s loop
and the windings of relay YH, under the effect oi'
which relay YH pulls up. Contact yhI removes
the short circuit of relay VBI-I, so that the latter
pulls up. Contact cbhV switches relay YH from
the source of alternating current and connects
it directly to the positive pole. Contacts vbhI
and 'ubhII switch the talking path between the
calling and the called parties through, so that
now the telephone connection is established.
At the end of the call both subscribers replace
their receivers, and relays AH, BH, YH release.
Relay VAH is thereby deenergized and therefore
over UahIII and vahIV it removes the busy po
tential from the c-wires of the call finder and the
line selector. As soon as PL is released, a circuit
20 is established for LWM over:
UahVII, pZIV, lwm, lcoh
Contact >lach is open as long as the line selector
is in the rest position, and it closes as soon as
this selector leaves that position. Contact lwm
is controlled by the armature of_ the line selector,
so that it operates as a self«interrupter.
Relay NA closes, with its contact nal, a circuit
for relay E in the first free outside trunk equip
ment. Contact eI prepares the test path over
the d~arm of the outside trunk selector, and con
tact eII closes the circuit for rotary magnet AWM
of the outside trunk selector, which turns step by
step as a self-interrupter until its switching arms
meet the connection of the calling subscriber.
The test circuit is thereby established over
-, RII/TII, rI, tI, d-arm of
AW, pIII, PI, PII, cI, +
Relay R pulls up and thereby separates the calling
equipment from the loop of the calling subscriber.
Relay P short-circuits the high resistance portion
of its winding, so that the subscriber is blocked in
known manner against seizure over other selec
At contact pV it opens the circuit for
AWM. - Contact pIII switches relay P from the
d-wire and connects it with the c~wire, so that
RII and TII now are held without the aid of
contacts tI, TI. Contacts pI, pII switch the tele
phone path frorn the subscriber to supply bridge
A, B. The two relays pull up; A switches in relay
VA, with its contact aIII, over
line selector turns until it reaches its rest posi~
tion, whereupon contact koi/z opens and stops the
30 selector. The local trunk thereby becomes free
again for further seizures.
B.-Calls from P. B. X. to Outside exchange
_, VA, am, xn, +
Contacts cal, 'UaII now assume the switching .
through of the subscriber’s loop instead of con
tacts pI, p11, which now open, because contact
vaIII connects the positive pole with the c-wire
The drawing merely shows the devices for out " and in this way releases P through short circuit
Incoming traiiic from ing. Contact vaIV, in preparation, is switched to «
the outside exchange has not been considered, connect the outside trunk start chain to the relay
since it is immaterial to the nature of the inven
of the next exchange connection set; consequent
ly relay E releases and, by its contact eI, definitely
If a subscriber wishes to establish an outside
breaks the circuit for P.
exchange connection, he lifts the receiver and
With contact al relay A has closed, over the
operates the key n at his station, thereby ground
winding of the repeating coil RU, the loop line 40
ing the talking wires. Therefore relay R can leading to the outside exchange, so that the call
not operate due to short circuiting, while on the
condition is produced at the outside exchange in
other hand relay T pulls up over its winding I known manner.
due to amplification of current and holds, after
If the outside exchange is of the automatic
the release of the key, over
type, then the subscriber will dial, in which case
contact aI transmits the impulses to the outside
_, Tl, 7H, N, tIII, TIII, NA, -I
exchange. While dialing, VB pulls up over
so that outside trunk starting relay NA responds.
If a call iinder AS has already tested when the
subscriber presses his grounding key, then,
through the grounding of the connection line, This relay holds because it is retarded against
relay BH of this call finder is caused to release release during each series of impulses, and over
through short circuiting and relay XH of the ubI it short-circuits repeating coil RU, in order to
respective local trunk is energized over its wind
prevent any distortion of impulses. At the end of
ing II:
the outside exchange call the subscriber replaces
35 side exchange traiiîe.
+, ahII, hhI, XI-III, _
The c-wire is interrupted at the rest contact
of rhII, so that subscriber relays R and T, which
60 in this special case have been energized over the
c-wire of AS and their windings Il', are caused
to release, and the a-wire is grounded over vahIII
at the front contact of œhII. Consequently relay
R can not pull up again over its winding I due
65 to short circuiting, while TI is sufficiently ener
gized over the direct ground to pull up and it
will hold over tIII in series with exchange start
ing relay NA. At œhï relay VAH is caused to
release slowly through short circuiting. Contacts
70 oahI, oehII open and relays AH, BH and XHI
release, so that the local trunk becomes free.
The subscriber relays are now in the same con
dition as if the grounding key had been pressed
before the testing of the call ñnder, and relay
NA is therefore operated in this case also.
the receiver; A and B release and cause the re
lease of VA, which hence removes the busy po
tential from the c-wire of the subscriber’s line.
Contact aI breaks the loop leading to the outside
exchange, so that the clearing signal will be given 60
there in known manner.
C.-An intermediate call during outside call
In order to establish an intermediate call con
nection the subscriber presses the key n at his
station N and thereby grounds the talking wire.
Relay B therefore releases, so that X pulls up over
aII, bI. Contact x1 in preparation short-circuits
the outside exchange loop over rI, ubI, in order
to preclude any interruptions. Contact acII re
moves the short circuit of VB, which therefore
pulls up, so that now switching relay UA is en
UAI/Wü. On releasing the key, B releases again
Relays RT and NA continue to hold `even
and hence switches off X. VB releases again. UA
continues to hold over:
after vahIII hasV removed the positive potential
from the a-wire. The switching condition is con
to be maintained over ual after the release oi X.
At the same time the short circuit around UB is
sequently the same as if a subscriber wanted to
reach a free «outside-trunk for an outgoing con Ul
nection, only that now an intermediate call con
nection is> to be considered instead of a sub
interrupted byudl so that this relay can pull upr
under the influence ci the exchange current.
scriber’s connection. As described with reference
to outgoing exchange trañîc, a free outside trunk
The direct current loop to the exchange continues
10 Contacts uaïI and uaIII switch the outside trunk
line from the' repeating coil and connect the in
termediate call line Q in its place. Relay RR
oi th-e intermediate call line pulls up:
selector AW starts to move now and finds the 10
intermediate call line. The subscriber can now
dial the desired outside exchange subscriber over
this second outside trunk line and is in a position
to make the intended intermediate call. As can
be seen from the foregoing, this intermediate call
connection runs over the switching arms ofthe
Local trunk starting relay NH is energized over
rrIV and ttIV. Exactly in the same manner as de
scribed in connection with local calls within
20 P_B. X., the call iinder of a free local trunk now
moves and finds the intermediate call line. The
subscriber selects in known manner the subscriber
desired for the call back. At the end of the inter
mediate call the subscriber switches back to the
exchange line by again pressing the key at his
original AW, the intermediate call line of this AW
and the switching arms of the second outside
trunk selector AW’ directly without a local trunk
being comprised in the connection.> At the end 20
of the intermediate call, as already described, the
key at the station is again pressed, whereby the
subscriber’s line is switched off from the inter
mediate call connection and is again connected
with the ñrst outside Ytrunk line which was wait
ing in the meantime. The second outside trunk
line used Y_for the intermediate call is consequently
station. Relay B thereby again releases so that
relay X is cut in by contact b1. Contrary to the
ñrst pressing of the key, relay VB can not pull up. released.
What is claimed is:
now, since it continues to be short-circuited over
i. In a branch exchange system having local 30
obIII, ubII, aIII. Holding winding II of relay UA
outside trunks, common local trunks ac
is short circuited at :cIIL so that UA releases.
This breaks the direct current loop to the local cessible to any of said local lines for establishing
trunk used in the intermediate call and the seized V@the connections from one local line to another,
local trunk is released.v The outside trunk line is outside-trunk switching apparatus for establish
4again switched through to the subscriber by the ing connections from a local line to an outside 35
trunk and ñrst discriminating means normally
release of X.
effective to associate said outside-trunk apparatus
D.--An intermediate call over a second outsid
with a calling local line in response to the ground
trunk: line
ing of the calling local line, theV combination
comprises an intermediate-call line, sec 40
4 i)
means responsive to a Aground
side exchange subscriber, wishes toV make an
intermediate call to another outside exchange ing of the calling line after the establishment of
a first connection to a‘ first outside trunk for tem
subscriber instead of to a subscriber connected to
the P. B. X. system, then he will by means ci key 1i porarily disabling said connection and initiating
an intermediate-call connection over said inter 45
45 ñrst switch, in the before described manner, from
mediate-call line and over one of said local
the outside trunk line to the intermediate call line
trunks; other means responsive to a later ground
Q so that a free local trunk will be seized. He
will now dial a. certain special number, thereby ing `ci the calling line during the intermediate
setting line selector LW to a contact to which is call connection for releasing said intermediate
connected merely the windingY I of relay 'XI-l~ of call connection and resuming said ñrst connec
the local trunk itself. XH pulls up over the c-wire tion and third discriminating means associated
and test relay PL. The pulling up of relay XII with said local trunk and responsive to the set
ting up of a particular number in said local trunk
`has now the same veiîect as described before under
for releasing said local trunk and grounding said
“Calls from P. B. X. to outside exchange” with re
spect to the case wherein the call finder had intermediate-call line whereby an intermediate
call from said calling branch exchange station
already taken the position of the calling'connec
over a second outside trunk is established by the
tion before the subscriber had pressed the ground
ing key ior the purpose of starting an outgoing actuation of said iirst discriminating >means
exchange connection. Contact 33h11 breaks the without actuating said second discriminating
holding circuit leading to RRII and RTII, so that means so as to resume the previously established
to said iirst outside trunk.
Vthese two relays release for the present, and at connection
2. A telephone system comprising an outside
the same time it connects positive potential over
exchange, a branch exchange, outside trunks ex
vahIII to the a-wire of the local trunk. There
tending from said branch exchange to said out
fore, BH releases and thus keeps relay XH ener
side exchange, branch stations, lines connecting 65
gized over ahII, bhI, XI-III. Contact xliI short
circuits relay VAH, which releases at the end of said branch stations to said branch exchange, an
its retardation period and hencedisconnects the impulsing device and a grounding device at each
talking wire by means of contacts Dahl', vchII. .of said branch exchange stations, local trunks
Consequently AH causes the release oí relay XH. for interconnecting said lines responsive to sig
The local trunk is released. When Contact :chil nals from, the impulsing device. at the calling 70
connected positive potential to the a-wire of the branch station, discriminating means normally
local trunk, relay RR could not pull up again, due responsive to the actuation of the grounding de
to short circuiting, while RT was energized over vice at a calling branch station for initiating the
its winding I due to current ampliñcation and establishment of a connection over one of said
locked over TtIII and outside-trunk starting relay outside trunks, intermediate-call means includ 75
ing an intermediate-call line and a ground-de
tecting apparatus, said apparatus being respon
sive to the actuation of the grounding device at
the calling branch exchange station after the
establishment of a ñrst outside connection from
said station to a first outside trunk for temporar
ily disabling said first outside connection and in
itiating an intermediate-call over said interme
diate call-line, said discriminating means being
also responsive to the reception of a predeter
mined set of impulses from the impulsing device
of the calling branch station during the con
nection of said calling station over said interme
diate-call line to one of said local trunks to
ground the intermediate-call line, release said
local trunk and initiate the establishment of a
connection over a second of said outside trunks.
3. A telephone system comprising an outside
exchange, arr automatic branch exchange, branch
20 exchange stations, branch exchange lines con
necting said stations to said branch exchange,
switching arrangements in the branch exchange
whereby any one of said lines may be connected
to any other of said lines, outside trunks extend
ing from said branch exchange to said automatic
outside exchange, an intermediate-call line, fur
ther switching arrangements within the branch
exchange whereby any one of said lines includ
ing said branch exchange lines and said inter
30 mediate-call line may be connected over any one
of said trunks to the automatic outside exchange,
and means whereby an automatic branch ex
change line which is engaged in a first connec-«
tion with a ñrst outside trunk may be intermedi
ately connected over said intermediate-call line
and said further switching arrangements to an
idle second outside trunk for establishing an out
ward call to said outside exchange over said sec
ond trunk while maintaining established the con
nection between said exchange line and said i'lrst
outside trunk.
4. A telephone system according to claim 3 fur Ul
ther comprising a grounding device at each of
sa-id branch exchange stations and means at the
branch exchange responsive to the operation of
the grounding device of the calling exchange sta
tion at the termination of an intermediate call 10
for releasing the intermediate call connection
and rendering operative the connection between
said station and said ñrst outside trunk.
5. A telephone system according to claim 3
having a grounding device at the calling branch
exchange station and means responsive to the
operation of said device after the initiation of an
intermediate-call for releasing said intermediate
call and resuming the previously established ñrst
connection with ther iirst outside trunk, which 20
further comprises special transfer apparatus re
sponsive to the grounding of any calling line and
switching means associated with a predetermined
path of the branch exchange and adapted to
ground said intermediate-call line responsive to 25
the selection of said predetermined path, where
by the said transfer apparatus is actuated.
6` A telephone system according to claim 3 in
which each branch exchange line is associated
with a line relay and a cut-oiî relay and in which
the said intermediate call line is associated in
like manner with a similar line relay and a sim
ilar cut-olf relay, these last named relays being
connected in the same manner as said first
named relays.
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