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Патент USA US2113119

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' April 5, 1938.
Filed’ Jan. 15, 1936
4 Sheets—Sheet 1
April 5, 1938.
" '
Filed Jan. 15, 1936
4 snaps-Sheet 2 <
Apia/N410 721mm?
650,665 7791/45 54(6)?
I ~
Filied Jan. 15, 1936
4 Shéets-Sheet 5
April 5, 1938.‘
, 2,113,119
Filed Jan. 15, 1936 '
4 Sheets-Sheet
> ‘I akoY :1
‘5 06
[Pia/M410 Jar/0K ‘
_ 660(61" 72/0/4145 644/5?“
fl'atehted Apr. 5,1938
UNITED-"STATES. vPM ENT 1 urn-cg] .5
' ‘2,113,119
Reginald Taylor and
Liverpool, England,
George) Thomas Baker;
assignors to Associated '
Telephone, & Telegraph Company, Chicago, Ill.,
a corporation of Delaware
Application January 15,
1930, Serial No. 594st
In Great
5 Claims.
4, 1935
The present invention relates to telephone sys
tems and is more particularly concerned with
system employing ?nal selector switches pro
vided with two or more sets of wipers, the re
' 5 quired set being connected up by ‘the operation
of one or more discriminating relays. The ob
relay. WS.
p '
when the speaking leads are l
. ,
relay‘ A operates and at armature al' brings up
relayB which, guards the circuit by placing earth
on the release trunk conductor at armature bl f
and at armature 66 operates relay C. Upon the
reception of the tens digit-relay A repeats the
loci; of the invention is to provide for more satis-i impulses ‘through the low resistance. leitv-hand
factory operation of such switches and ‘for new winding-of relay C to the vertical magnet ,VM
trunking arrangements whereby their improved which according'ly'raises the wipers to’the desired
10 i'acilities may be used to_better advantage.
According to one feature of the invention in an
automatic switch, provided with a plurality oi"
' sets of wipers determination of the set of wipers
,I I.
' On'the ?rst vertical step the of! normal springs I‘
are mechanically operated thereby at springs ~Ni
short circuiting the right-hand winding of relay
C which however, remains held during impulsinz
15 to
be over
used which
is effected
the in
has 5 been
but only after the setting operation has com
over its other‘ winding.‘ It will be understood’
that the short-circuited winding or relay C*acts
,as a copper slug and the relay is thus made slow‘
According to another feature of the invention releasing. Relay B is also held during impulsing
in an automatic switch provided with a plurality by the assistance 01' the copper sing on its core.
' At the end of the tens digit, relayA remains
20 of sets 01' wipers the determination of the set
to be used is effected in the interl 4 energized and relay C releases‘ after a short in?
digital ‘pause between two trains of impulses terval and at armature cll completes s circuit for
operating relay E in series with the-vertical mag
transmitted for setting the switch.
VM. ‘Relay, E at armature ei ' transfers the
A iurtha' featuretoithe invention is that‘ in net
.25 a telephone system employing automatic switches impulsing circuit to the-rotary magnet RM and
at armature‘ e2 removes the short circuitiromrl
- with a phrality of setsrof wipers wiper dis
crimination at the final selectors is e?ected in relay '0 which thereupon re-operates and trans
accordance with the route over which the switch iers the holding circuit for relay E to the control
is seized, all the possible routes extending from oi its own armature .ei. The units digit when
30 the same position of a preceding switch over the.‘ received is similarly repeated by relay A through
the low resistance winding oi relay C‘ tothe r07
same set of wipers.
_ _
'Ihe invention will be better understood from tary magnet RM which advances the wipers into
engagement withthe required subscriber's line.‘
the following description 0! one method oi-car
On the first rotary step the rotary oi! normal‘
' rying it into e?ect, reference/being had to the’
35 accompanying drawings. These comprise Figs. 1 springs are mechanically‘ operated, thereby at
springs NRI short, circuiting the left-hand wind
and 2 which show a 200-line '?n'ai selector ar
ranged ior ordinary operation and Figs. 3 and 4 I ing of relay C which again holds during impuls;
\ I -‘
which show a 200-line ?nal selector adapted to ing over its "other winding.
At he'endoi the units digit, relay C releases
perform a P. B. x. hunting operation on ‘any
and: opens the circuit of relay E-and during the
slow release period-oi the latter a testing circuit ;
The mechanical construction of the switch to, is
completed for relay H to the test wiper PI‘.
which the circuits apply is assumedto be similar .
to that described inthe applicationv of R. N. . .11 the line is free,‘ relay H operates in series-with
saxby. Serial No. 634,285,- tiled 22nd September - the cut oi’! relay oi the called subscriber's lihe"
45 1932, now Patent.‘ 2,028,689,;granted Jan. 21, '
1938, in which only two magnets are provided for
a vertical and rotary type switch and release is
brought about by the further operation 0! the
rotary magnet which advances the wipers clear
circuit and at the makeéiirst armatge ‘hi com
oreover. at .
- pletes'a locking circuit for itself.
' armature hi direct earthis-connected to the'test >
wiper Pl to busy the called line and at armatures
hi. and M the‘ ringing circuit is prepared. Up
‘ on the release of relay E aiter its slow periods 50 '.
Referring now to Figs. 1 and 2, it will ?rst be ' circuit is completed over armature cl tor operate 1 _ '
assumed that the switch is taken into use over in'g relay J which thereupon locks over its arma- '
'50 oi'theba'nka'
“the odd‘ set of conductors negative I._ positive: ture ii and at armatures 18 and i5 compietesthe'
' iTindiPt'in' which case itsoperation does not‘. ringing circuit includingthe generator GNR, the
'55 involve the ener'giaation of the wiper switching
' left-hand winding of relay 1" and the-ringing re
turn resistancefYA. During the ringing‘ period
ringing tone is extended to the calling subscriber
over a leak circuit provided by the low capacity
condenser Q1) and through the lower winding of
relay D to inform him that the call is proceeding.
Meanwhile owing to the release of relay E, relay
C has re-operated and at armature cl prepares
also‘ be noted that seizure of the switch during‘
the unguard period does not interfere ‘with the
release because the initial operating circuit of re
lay B is available only when theyswitch is in its
normal position.
when the switch is taken into use over- the even -
set of conductors ‘nega‘tive‘l, positivc 2, and P2, '
- a circuit for re-operating relay‘E.
the circuit operations are the same as described
When the called subscriber replies, the direct , up to the end of the tens digit where relay E op
10 current loop completed across the line causes the
- ring' trip relay F to energize whereupon byoper
ating its light armature Ii it locks up over its
right-hand winding in series with “relay H. Re
lay F cuts oil’ the ringing current at armatures f2
and f3 and completes the talking circuihbetween
the calling and called parties. Relay D'now op
crates over the called subscriber's loop in series
with the iron-hydrogen current limiting resist
. ance BRA.‘ This resistance has‘the property of
erates on the release of relay C. In these cir-,
cumstances the operation of armature e4 removes,
a ‘short-circuit from the left-hand winding of the
wiper switching relay WS and enables it to op
‘erate in series with‘the line relay A. Relay WS
locks over its, other winding and armature 108i
.and as .soon as the rotar movement of the
switch begins. its operatin
winding is again '
short-circuited by the normal rotarylsprings‘NRl. -
This arrangement provides constant seizure time
limiting the current passing therethrough to a regardless of ‘the route over which the switch is 20
predetermined value and its purpose is to main
taken ‘into use. Operation of the switch now'
tain a constant battery feed to the called sidee'of proceeds as described with the exception that
the circuit over a wide range of loop resistances. ‘the lower set of wipers are connected up to en
Relay D at armatures di and d2 provides ‘the able selection to takev place in the even hundred
PD usual supervision by reversing current/to the call
group of lines. It will be noted that with. relay 25
ing side of the circuit and at armature dl oper-, WS' operated the conductor ll extending to a_'
.ates relay E which locks up at armature c8 and common timer is connected to' the test jack Tl
at armature e5_ connects booster battery‘ to the so that if a link 'is inserted in the appropriate
release trunk conductor to operate the calling test ‘jack springs the buzzerrmay be operated ‘to ‘
30 subscriber’s meter in rthe well-known manner. indicate to an attendant when the lower set of 30
Relay E also at armature e3 releases relay J the ,wipers is in use. In the event of the test wiper ._
Irelease time of; which‘ determines, the duration Pi or P1 encountering booster battery from :a
of application of_ the metering pulse after which
~ line in the metering'condition there is no danger‘
earth lyre-connected to the release trunk con
of false switching since ‘the windings of, relay H
ductor at the resting springs of armature» 12 to ' are arranged to neutralize as soon as the make-,
guard the circuit.‘ Relay J upon releasing opens
?rst armature hJ closes and full operation of the -
‘ the circuit of relay E which also releases after . relay is prevented,
its slow-
without any ‘material change to
the circuit connections.f_ Clearly if relay D ini
The circuit including‘armatures d! and II and
' lamp LP_ extends by way of common conductor II
tially operates intermittently due to clumsy re
to an alarm and serves to indicate if, the called 40
moval of the‘receiver by -the~called party, relay subscriber is held unduly owing to the calling
E remains locked‘and there will be no false in
terruption of the metering pulse.
subscriber failing to hang up.
Referring now to the operation of the P. B. X. '
If the called subscriber is busy, relay H will . ?nal selector switch slipwn in Figs. 3 and 4 it will
be understood without further description that. 45
as regards the setting of the wipers and the se
a circuit is-completed over arr’naturee3 for oper
lection of an ordinary line the‘ operation of‘ the
ating relay G’ which at armature gl connects circuit is the same asin Figs. 1' and 2.
busy ?ash and tone from the cam assembly BT '
When the wipers of the‘switch are set into en-v
50 to the lower winding of relay A and at armature
gagement with the first line of a‘P. B. X; group, 50
02 connects the busy'hold cam assembly BE in ' one or other of the group testing wipersPZ' will
circuit with the left-hand winding of relay'B in encounter battery since theP! contacts are wired
order that vthis relay (shall be held.’ during the as shown'in the lower corner of Fig. 4-, Comeflash period when mam-.4 releases. 7
quently if. relay H fails to operate owing to the '
not operate owing to the absence of battery on
the test contact and‘ upon ‘the release of relay E
/At the end of the conversation when the call-v '?rst line being ‘busy, relay HS operates over its’
ing party replaces hisreceiver, relay K releases upper winding to prepare the switch for autm-
and allows relays B, C, F and H to fall away matic rotation and at~armatu~re hsl switches one
whereuponearth on the release alarin common ’ winding of relayG into vthe testlngcircuit of re
I. provides a self-interrupted driving circuit for lay H._ when relay E releases, relay C re-o r- 1 60 the rotary magnet RM to advance the wipers _ 'ates and at armaturevci in conjunction- with ar 60
‘ clear'of the bank so thatthey restore to the home‘ mature?sl completes a circuit'for the rotary
position where the circuit is opened'by the ofi= _ magnet RM which energizes to advance the wipers, '
normal springs N3.‘ Relay B‘ upon releasing, at
on“ to the next set of contacts. At the end of
armature bi removes the guarding earth from __the' magnet stroke the interrupter springs‘ rm
the release‘trunk conductor to enable the .pre
close and complete a circuitfor energizing relay
ceding switches to restore butupon the release G-over its ‘lower winding so that this relay in turn
of relay C earth is re-applied to the rel‘easetrunk at armature 95_ opens'the circuit for the rotary
conductor over armature. c3 ‘until the \switch 'ar-‘
rives at its home position where the earth is dis
connected by the off-normal springs N2. Under.
,This interaction between the rotary
magnet and ‘relay 0 serves to rotate the wipers.
» in search of a free line .in the IP.,B.' X. group. 70
During hunting, ‘relay, as. is intermittently ed
ergi'zed‘by armature 04 but remains held with, 'l
therefore the unguard period on the release trunk . the assistance of its‘ copper sing and the shunt-v
‘ all conditions of release it is arranged that relay‘
B'releases relay ‘,0 in'the manner described and
conductor is determined by the releasing time of
relay C which is substantially‘constant. It should
ing effect of the lower winding of relay H.
. When‘ a free line is ‘found; relay 1! operates in ‘17g
Alternatively of course, the‘ ?nal selector ac-_
series with'the called subscriber's cut-oi! relay
and relay G which now holds to prevent further cording to the. invention maybe arrangedv for
seizure from two di?erent groups oi'group selec
rotation of the wipers. Relay H then locks inde
pendently over its other winding and armature" tors or ‘from diiferent levels oi the same group
_ 5 hi, and at armature k2 connects direct earth to -
the test wiper and bank contact to hold the called
We claim:
subscriber's cut-off relay and short circuits re
‘Is In combination, an automatic switch hav
lay G. Relay G thereupon» releases relay HS a ing two sets 01 wipers, two routes over which said
'which at armature hs5 completes a circuit for switch may be seized, means’ for directively oper
ating said switch after seizure over either route,
10 operating relay J which thereupon applies ring
and meanse?ective only ai'ter the switch has
ing current to the selected line.
been operated for selecting one of said two sets
When the called subscriber replies,‘ the ring
ing is tripped and a booster battery pulse is ap ' of wipers in accordance with the route over whic
seizure lo! the switch has been effected.
plied to the release trunk conductor in the man
15 ner described in connection with Figs. 1 and 2, ~ 2. In combination, an automatic switch having
two sets of wipers, two routes over which connec
to effect the operation of the calling subscriber's
tions may be extended to said switch, mea in
prevent relay G from operating if the Pl wiper‘ said switch responsive to primary and seco d'ary
controlfexercised over the particular route used '
should pass over busy lines in the metering con
meter. The'metal rectifier MBA is provided to
It all the lines in the group are busy, the group
in extending connection to the switch for effect
ing the setting thereof, and means in said switch
_testing wiperii32 encounters earth on the last controlled in accordance with the route in use
contact whiclfholds relay G over its lower wind-:_ and during apause between the primary and sec
ing in series with resistance YO. Relay G opens‘
> 25 the circuit of ‘relay HS which releases ‘alter its
ondary controlling operations ior effecting‘ wiper
. ‘ signal to the calling‘subscriber;
. In the event of the wipers oi! one switch pass
ing. oyer ‘ contacts engaged by the wipers of
t 30 another switch which has just been directively
-3'. In combinatioman automatic switch having
slow period and extends the busy ?ash and tone
two sets of wipers, wiper selecting means, two
trunk conductors over which'a plurality of series
of ‘impulses may be transmitted to said switch to
setthe same on a called line, said trunk con
‘30 Y
set to an intermediate linepthere is a possibility Qductors being ‘used/alternatively. depending on
that the G relay of the hunting switch and the which set of wipers has access to the. called line,
HS relay of the stationary switch will operate and means for controlling said selecting means
_To obviate this a high resistance YC is
during the spacing between two successive series
35-; connected in circuit-with the lower winding of
of impulses and ,in accordance‘ with the trunk
conductor over which the. impulses are being
. > in series.
I relay G which de?nitely prevents relay HS from
operating. Relay G however can operate but
4. In combination, an automatic switch having
1 only during the comparatively short slow release
period’ of relay E in the stationary switch, and \ two sets of wipers. a line relay in saldswitch, a
40 accordingly there will be little'or no interruption \ circuit for said line relay including a talking con 40 I
ductor incoming to said switch, a wiper switching‘
to the hunting movement oi‘the ?rst switch. . »
A switch of the kind above described is partic ' relay included in said circuit, said switching relay
ularly suitableior inclusion in a system whereby- ' being normally ‘short circuited, setting means in "
switching‘stages not fully utilized are eliminated. said switch controlled by said line relay responsive
45 Thus‘ it“ the switch is- seized iroma 200-outlet to impulses transmitted over‘ said circuit,‘ and
group selector arranged to respond to a prelim - means eil'ective after impulses have been received
inary digit without an- ei’iectivev setting of its for momentarily removing the short circuit from
wipers, a 4000 line exchange can be provided with, said switching relay‘ to permit the same to ener
only two ranks of switches. The group selector I‘gize in series with said line relay.
50 would need to be of 800 points capacity with two '
sets of wipers each having access to 400 contacts
' 5. In a telephone system‘ including a; selector
switch having a set of wipers which includes two
and‘ associated with a di?erent group of final wipers used. alternatively, a connector switch
selectors. The preliminary digit " would deter‘—-' having two sets of wipers. two routes over which
”mine which set of wipers was to be useifand said connector maybe seized from said selector,
55 hence which group of ‘final selectors would handle both said routes extending‘irom the same posi
the call and also which positive lead was toibe tion of the said selector wiper set and the route
used so as to determine wiper selection in the used being determined by which of said altema-'
tive wipers is'used. andlwiper selecting-r means
final selector. The preliminary digit might oper
ate a relay counting chain or a small auxiliary '
‘in said connector controlled in accordance with
‘60 rotary switch or the main switch might be given , the route over I“ the connector is seized. .
,a preliminary vertical setting and then drop back .
' in readiness for resetting by the subsequent digit. -
. _
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