US1695268A - Automatic telephone system - Google Patents

Description

Dec. 18, 1928.

F, ALDENDORFF AUTOMATIC TELEPHONE SYSTEM 3 Sheets-Sheet 1 Original Filed Feb. 14. 1922 IQTJ 000 7 m II. N; m4 H -Q VL mm w WKIIW 7?! i v Dec. 18, 1928.

F. ALDENDORFF AUTOMATIC TELEPHONE SYSTEM Original Filed Feb. 14. 1922 3 Sheets-Sheet "mu 8 w a o O 5/ Q 2 7. 9 0 w 1 3 3 in: 5 W u 8 m 3 w W M, /l 6 7 nuw H? a w nw h/bb 5 f a w tutu w wrlTl 61 u y g. +A|% lmlllfi v u 2 w W x 5 J W I 6 1 J m 1 3 6 6 h W a 55 J Illa/ an on- FAZdendo Patented Dec. 18, 1928.

UNITED s r-Ares PATEN PU F-ICE.-

FRI'JZZ ALDENDORFF, or 13Ea1,IN --.'virrL1i[Ens]:o RF, GEEMANY, nssrenonor ,ONE-FOURTH TO PAUL KOLISCH, on NEW x031 N. Y.; CHARLOTTE ALDENDORFF soLn HVEIR 0F SAID B Z EN'D i I DECEASED- ai 'roivrarrc TELEPHONE sysrnm.

Original application filed February M, 1922, Serial No 536,504, new Patent No. 1,641,145, dated September 7 6, 1927, and in Great Britain May 17, 1921. Divided. and this application filed April 7,1926. Serial no. 00,291 I This invention" relates in general to -telephone systems in which the connections between the subscribers lines are set up with the aid of electromechanically controlled switching apparatus and isa division of application Serial No. 53655041 (United States Patent #1,6417,145). One oi the chief objects of the invention is to simplify the mechanical construction' of the switching devices. To this end the system is' arranged in such a manner that the switches employed for establishing talking connections areuni-lnotional that is each has wipers that only execute simple rotary motions or, if preferred, straight line motions. bi-motional switches may be entirely dispensed with, without 'perceptibly slowing down the speed with which the connections are obtained. Another feature of the invention is that a ca'lling party selects the desired number, but not actually the desired line, by means of devices which revert to common use as soon as a talking connection is set up between the lineof the calling party and the desired lineby talking connection switches. The selectingimpulsesfor selecting a desired number are partly sent into, a device permanently associated with. a talking connection switch and partly into a wanted line designating device which may be common to a numberoftalkingconned tion switches. i

Another feature of the invention is the use i of a switch or switches with a singlewipen driving means, a primary numerical device for selectingany desired group oi bank con tacts in the'swi-tch, and-asec'ondarry numerical device for controlling the driving mechanism whilst the wipers are being set onto a'certain contact (or set of contacts) in'the selected group of bank contacts. Circuit arrange ments are provided for enabling one orinore secondary devices to be used for controlling the driving mechanism of any one of a number of talking connection switches. A connecting device is provided forconnecting a secondary controlling device to any talking connection 7 switch. A connecting device which is arranged to connect an associated switch controlling device to another talking connection trunk as soon. as the previous In accordance with this invention,

with this latter finder.

of bank contacts of the talkingconnection switch. v

The connecting devices ortrunk finders are so arranged that the release from a trunk depends 'fiIStly on the calling subscriber being connected to said talkingtrunk and secondly on this trunk being connected to another trunk or tea line leading to a desired subscriber. The release of the trunk finder is eflected by acircu-it (controlled :by the release relay of the transitorily engaged finder and by a relay associated with the 'trunkfinder that is de-energized at the moment whena talking connection is extended through the talking connection calling-line finder to the wipers of the switclrassociatcd The connection of the calling subscriber is transferred from a transitoi'illyusecl trunk to theitalking trunk at v a certain moment. Up to the moment when the connection of the calling subscriber to' the talking trunk, the release of the line selecting or designating switch is under the is transferred from thetransitorily ised trunk H control ofthe release relay associated wvith the transitorily used trunk. At the moment when the'connection. of-the calling subscriber is transferred from the transitorily nsedtrunk to the talking trunk,"the release of the line selecting switch is made dependent on a device associated with the vtalking connection calling line l'lIlCl1-. Atthemoment when the connection of the calling'subscri'ber is extended through a talklng connection calling llne finder and its associated trunk to another trunk or line) the 'line selectingswitch is released. The line selecting or designatswitch isreleasedat any moment during the progress ofthe connection through the tr-ansitorily engaged switchesby the de-energizatiou .ot 'their associated release relay,

- DS identifies calling lines in the banks of or, during the progress of the talking connection through the talking connection calling line finder, by the deenergization of a relay associated with this finder. Means are thus provided for properly releasing, at any moment in which the call may be abandoned, all the devices allected in making a call in a system using by-paths for selecting purposes. Further features of the invention will appear hereinafter and in the claims and drawing in which latter Figs. 1 and 2 show the circuits and switches of a complete system employing transitorily engaged marking switches for designating the group and terminal 10- cations of wanted lines in a main lineswitch. These figures also show atransitorily engaged. line linderand a preselecting trunk finder switch and Fig. 8 shows amodificacation of the auxiliary arrangements for set ting a talking connection switch or main switch onto a wanted line or trunk.

Referring to the drawings 8 represents a calling subscriber, CS is a talking connection calling line finder, WS is a talking connection wanted line finder, T is a talking connection trunk "forming a link between the finder CS and the numerical switch VVS, T-F

is a trunk finder," F is a transitorily engaged,

finder, S is a units selector or wanted line designating switch.- When a subscriber S makes a call his line is first connected by a finder F to a switch Sand his selecting impulses pass through the finder F partly through the associated trunk finder TF into a group selecting device Sg and partly into the units or line selecting device S. The impulses sent into the group selecting device 89 immediately cause the wipers of the finder VVS to start travelling towards the selected group or bank contacts. and when they have reached this group they continue travelling until they reach a contact designated by the units selector P. W' hen theyhave reached this contact the selected line is tested by a test relay 27/ associated with thefindcr WS.

If the tested line is tree the test relay ener gizes. 7 Meanwhile the calling line finder CS will have moved its wlpers onto the bank con- 'tacts corresponding to the line of the calling subscriber S. hen the line finder CS has set its wipers onto the calling line and, in addition to this, the test relay tr responds, the line of the calling subscriber S is switched through to the wanted line and the trunk finder TF is caused to set its brushes onto another trunk T which is neither engaged by a conversation nor seized by another trunk finder. The by-pat-h consisting otF, TF and S may then be used for another connection. a

An identifying switch DS isprovided for a group of finders F. This identifying switch the switches CS and F in such a way that a calling line finder US will never connect to any calling line except the one by whose call it is affected. I 7

Another identifying switch DS is provided for a group of units selectors S. The identifying switch DS prevents a called line finder TVS from stopping on any wanted line excepting the line selected by the calling subscriber and connected to the finder VVS. The release of the units selector S depends on the release relay 1" up to the moment when the calling subsoribers line is found by the line finder CS. At'that moment the releaseof the switch S is made to depend on arelay 3 associated with the finderCS or on the test relay tr.

The operations involved in establishing a talking connection will now be more fully described. w'When the calling subscriber Elraises his receiver the line relay 4. associated. with his line is energized by a current which flows from the positive pole throughl, contact 5 of cut-ofit' relay 6, limb b of calling line,

instrument S, limb c ot a calling line, contact? of cut-otl relay, other winding 0t line relay 4 to the negative pole, The line relay 4 on. energiz ng prepares astoppmg circuit by means of its contact 9, closes an operating circuit of a transitonly used finder F at its contact 11, and renders the calling line busy ping relay 24;, brush 28, stopping wire 31, contact 9, cut-oil relay 6 to the positive pole. The relays 6 and 24 are thus energized, the

latter relay opening the circuit of the operating magnet 25 at 13, preparing an identifying circuit at its contact 14;, preparing a circuit at 15 which extends through the relay 33 and the contact 32 when the relay r is energized, reducing the potential on the stop ping wire 31 by. closing its contact 16 and extending the subscribers line a, Z) to the impulse relay 85 through its contacted? and 18. The cut-off relay 6 disconnects the line relay from the subscribefis line at its con tacts 5 and 7 and connects itself to the stopping wire through its contact 8 thus making its circuit independent of the contact 9 of the line relay which is opened as soon as this relay is cut oltfrom the calling line as de scribed.

, The calling subscriber, over whose line cur rent now flows through the windings of the impulse relay 35which in turn has energized the release relay 1" by a circuit extending from the positivepolethrough 21,1", 36, to the negative pole, now commences sending his dialling impulses. The contacts 32, 38, 39, 10,42 of the release relay rare closed and the contacts 34:

and 11 of this relay are now open. At the contact 10 a circuit is closed which extends from the negative pole through 40,-relayi3, wiper 415 of trunk finder TF, corresponding bank contact, wire 50, relay 51,-conta'ct 52 to the positive pole] This circuit helps to control the release of the secondary or units designating switch S and of the primaryor tens designating switch S9 as Wlll hereinafter more fully appear.

WVhen the calling subscriber sends in his dialling impulses intermittent closures ofthe" contact 22 will take place due to the deenergization of the impulse relay 35 and tens impulses will flow from the positive pole through 22, contact 39, Wire 53, off-normal contact 5 1, slow-acting relay 55,wire 56,

wiper 46, corresponding bank contact of trunk finder TF, wire 57, wire 58, operating magnet S9 of the tens designating switch which has a switch-arm 59 and an arcuate member60 adapted for connecting the negativepole to any number of contacts 61, 62, 63

' at one and thesametime. According to the number of-tens-impulses sent through the operatingmagnet Sg fewer or more contacts 61,62,63 Wlll be connected to the negative pole by the member 60. If only one tens im- It will be assumed that-the calling subscriber has sent in three tens dialling impulses and that the member 60 has therefore appliedthe negative pole to the contacts 61,62 and hence to the contacts65, 66. As soon as the negative pole is applied to the contact 61 an energizing circuit for the operating magnet '68 of the main switch VVS is closed which extends from the negative pole through 61, 65, wiper 69 of the talking connection switch VVS, operating magnet 68,-interrupter 2' to the positive pole. The wipers will now be'driven forward by the magnet 68 until the wiper 69 is driven off the \Vhen the release relay 7' closes its con' tacts 38 itthereby establishes an energizing circuit for the operating magnet 74 of the calling line identifier. DS. This circuit extends from the negative pole through 38, 75, operating magnet 7 41 to the positive pole. The

magnet 74 drives the wipers 76, 77, 78 of the identifier DS forward until the wiper 77 reaches the'contact 80-to which thenegative pole has been applied by thecontact 1 2 ofthe releaserelay'r usedfor the particular connection. A currentthenflows from the positive pole through the relay 7 9, wiper 77,- bank contact 80, contact 81 of relay 82, contact 42 to the negative pole. Therelay 79 opens the -operating'circuitat contact 82 so that the wipers 76, 77, -78'stop on the bank contacts 83, 80, 84 leading to the particular finderF and trunk finder TF appropriated for the call in question.

W'Vhen the relay 1 was energized and thus caused the energization of the relay 51 as previously described, it also started the operation of-the voice current cailing line :[inder CS by'means of a circuit that extendsztrom the ne ative pole through contact 86, wire 87, bank contact 88, wiper 89 wire 90, contact 91 of the identifying relay 92 operating 1nagnet'93 of the voice current finder CS, interrupter r to the positive pole. 'W hen the wiper 89 is driven 011' the bank cont-act 88 onto the contact strip at, the circuit of the operating niagnet 93 extends "from the negative pole through 94, 89, 90, 91, 93, i to thepositive pole and this circuit remains closed until the identifying relay '92 opens its contact. 91 which it will do when'the wipers 92, 93, 94 and 95 reach the set of bank contacts that belong to the calling subscriber whohasappropriated the switch CS'for his call. iVhen this set of bank contacts is reached an identifying circuit is closed which extends from the negative pole through 78 of the identifier DS, 8i, relay 82, wiper 14E, wire96,iwire contact '91. The identifying relay also closes its contact-s 101,102 whereupon a "current flows through the relay 3 in a circuit which extends from the negative pole'through the left winding of 3,- wire 1, 101, 92, b, S, a, 93, 102 right winding of 3 to the positive pole. When the relay 3 energizcsit'opens the contact 98 and closes at its contact 103 a new energizing circuit for the relay 92- which extends froin the negative pole through 103 upper winding of identifying relay 92, wire 10%, wiper 9 wire 31, contact-9, cut-cit relay 6 to the positive pole. Thus, the energization of the relay 92 is now made to depend on the relay 3. Before the contact 98 is opened anew circuit established for the relay 82 through the contact 108 this circuit extending from the positive pole through 108, 97, 96, 14;, 82, 8 1, 78 50 the negative pole. When the relay 3 opens the contact 52 itestablishes'a new ircuit for the relays 43 and 51 which extends through, the contact 109 and contact 110 to the positive pole. The circuit oft-he relays 51 and 43- is thus now made'to depend onthetest relay tr.

It was shown in the foregoing description that the tens dialling impulses go through the slow acting relay 55. The impulses keep Wheh all the tens dialling impulses have been sent in, a. short pause ensues during which the relay allows its armatures to drop back. l l hen the calling subscr1loer thereatter sends in the next series of diallingv iinpuls 1 this next series flow from the posi tive pole through 22, 39, 53, 122, slow-acting relay 123, contact 124, operating magnet 121 to the negative pole. By this means the wiper 125 is set on to the proper units designating contact, say 126 for designating the particular set of bank contacts wanted in the group of bank contacts that has already been designated in the switch lVS. When the units dialling impulses commence flowing through the relay 123 this relay energizes and closes an energizing circuit for the relay 128 which extends from the negative pole through 127, 128 to the positive pole. The relay 128 closes its contacts 129, 130, 131, 132. By its contact 129 the relay 128 preoares an oaeratin circuit for the drivin 22 m magnet 68 of the switch lVS. This circuit is closed when the units dialling impulses cease and the relay 123, is deenergized. This circuit extends from the negative pole through the wiper 131 01": the. wanted line identifier DS which is operated as will be described presently, bank contact 132, contact 130 of the relay 123, contact 129 of relay 128 (which will have closed a locking circuit for itself extending from the positive pole through 130, 136, 137, 40 to the negative pole), 140, wiper 48, corresponding bank contact of the trunk finder TF, wire 141, contact 142 of the identifying relay 143, driving magnet 63, interrupter 2' to the positive pole of the battery. The driving magnet 68 now drives the wipers 69, 70, 71, 72, 73 forward until the wiper 70 reaches the bank contact 145 designated by the wiper 125 having been set onto the bank contact 126 of the'units designating switch S, An identifying cur rent will. then flow from the negative pole through 131 132, relay 146, wiper 125, contact 126, bank contact 145, wiper 70, right winding of identifying relay 143, wire 148,

, corresponding bank contact of trunk finder Th, wiper 47, wire 149, bank contact 150, wiper 151 of the wanted line identifier DS' to the positive pole. The identifying relay 143 and the relay 146 are thus energized, the

:lormer relay opening the circuit of the driving magnet 68 at its contact- 142, closing a locking circuit for itself which first extends through the contacts 152 and 155 and then through a path leading through the contacts 153, 299 and 103. By means of contact 155' the identifying relay 143 applies the negative pole through 153, 155 to the test relay tr and, if the wanted subscriber is free, the test relay tr will now be energized by a current flowing from the negative pole through 153, 155, tr, 160, wiper 71, test wire or wanted line corresponding to 161, a contact corresponding to 10, associated with the wanted line, cut-ofl relay associated with the wanted line and corresponding to 6, to the positive pole of the battery. The test re-, lay tr on energizing opens at its contact-110 the circuit of the relays 51 and 43 which will have extended at this time from the positive P0116 through 110, 109, 51, 50, 45, 43, 201, 199 to the negative pole, and upon. the armature of the relay 43 dropping back impulses will flow from the positive pole through the interrupter 2', contact 41, 200, oil-normal contact 191, driving magnet 121 to the negative pole. The driving-magnet 121 will now continue receiving impulses until it has driven its wiper 125 into the normal position when the oil-normal contact 191 will be opened to stop the operation of the magnet 121. When the relay 43 is deenergized as described acurrent impulse also flows from the positive pole to the interrupter 71, contact 41, 200, 198, relay 1.97, to the negative'pole. The relay 197 is'thus energized to close the circuit of the operating magnet 194 of the trunk finder TF, this circuit extending from the positive pole through 2', 193, 194 to the negative pole. Whenever" an impulse flows through the magnet 194 an impulse will also flow through 2', contacts 195, 196, upper winding of relay 197 to the negative pole, so that during the transition or stepping of the wipers of the trunk finder TF from one set of bank contacts to the next the relay 197 will be kept energized by an impulse through i. VVh'en this impulse through 2' ceases the upper winding of the relay 197 will, whenever the wipers strike a set of bank contacts belonging to an engaged or seized trunk, receive current through a contact 250 or 185, wire 251, wiper 49, contact 196 or through a contact corresponding to 192 in another trunk finder and through the relay 197. When the wipers-oi? the trunk finder TF strike a. of contacts that correspond to a tree trunk that has not been seized by another trunk finder similar to TF the relay 197 will be deenergized to open the circuit of the driving magnet 194. The moment the wipers of the trunk finder TF are moved away from the set of bank contacts leading to the trunk that was appropriated for the particular call in question the locking circuit of the relay 82 which ex tended from the a negative polev through 37,

82, 4A, 96, 97,108, to the positive pole was opened When the relay 82 was energized in the manner hereinbefore described and opened its contact 81 it caused the-deenergie zation of the, relay 79 and thus made the ealling-lineidentifier DS available-for the other calls. 7 e

Thewanted line identifier DS had its Wipers 151, 270, 131 set; ontothe ,bankcontacts corresponding to the units designating switch S in. the following manner :-When the. relay 128 was energizediit. closed at its contact 131 an operating circuit extending {110111 the positive pole througlri,p131,:281, 282, 280,'to

the negative pole. At the same time the relay 128 applied the positive poletothebank contact 283 so that when the -driving;magnet 280,- had driventhe wipers 151, 270, 131 ontoathe set of bank-contacts corresponding to S a stoppingcircuit was, closed which extended from the negative" pole through the relay 2,85, wiper270, contact 283, contact 132=to the positive pole. The circuit through the relay 285 is openedand-the wanted line identifier DS is made available for-1 other calls :at the moment when the identifying circuit through the a relay, '1- l6=is CIOSBdyt'O open=ats contact 136 the locking circui-t-ofthe relay 128 -w-l'iich-ex-tends from the positive pole through the lower Winding of 128, contact 130, contact 136, wire 137 and; through the contact 401.01% through the contact 201 199'to the negative pole. It a is thus seen that theWanted-line-identifier DS is made availabletor-another call as soon as the talking connection switch WS-with which it was coupled through 'IF has been set onto the bank contacts leading to the line of,

the wanted subscriber.

The transitorily usedfinder F is made available for a new callvat the moment when the relay 197 is energizedinthemanner described above, when the contact :36iof the relay '197 is opened and the circuit fromthe positive'pole of the battery throu'gln21, r, 36

to the negativev pole is interrupted The relay'r is thendeenerg zed and closes 'a-t-1tscontact the circuit leadingthrou'gh the conetact 20 of the slow acting relay 33, winding,

of the relay 301tothenegative polel The a relay 30 is then energizedianjdvopens (the cons tact -19 to interrupt-the circuityof the relayl;

24. When the relay 241 is deenergized the impulse relay 35 is 1 disconneeted {from-the; calling line atthe contacts117and 18: The

driving magnet 25,- will, now; be reconnected through 13 to theswire'23 which 1 leads to the! contacts, corresponding to 11] of itllvthfi line relays of thisparticular group; ofgsubs'eribw ers. i

The events involvedin establishing a connection through the switch CS',':the;tr-unk T. and the w'anted lineselector WS were explained-above uptothepoint where thev -test relay tr had attracted its armature and opened also openedat103.

, the -.c ir cu-i t of. the relays 51 and l3uat its contactl l-O. At itscontact16 1 the relay. tr closes tl1G-IG1TCL11lAOiE the ringing relay 171, whichex tends fromthe negative pole through 280, 1641,

ringingrelay; 171, interrupter fito the pos-i tive pole." Ring ngcurrent is now 1nt6111'l1ttentlyr sentil'roin a ringing generator 291 through 174, 180, 7 3 tovthe called subscribers stationandback through the. Wiper 72, contact 17 8, contact 175 back to the generator 291.; lVhenthe Wanted subscriber responds there;

lay 170 is energized and; at its contact 290 it opensithe circuit of the ringing relay 171.

The calling subscriber S is now vconnected through tliewipers92, 93, contacts 101, 102, condensers,- contacts 172, 173, contacts 180, 178, Wipers 72, 73eto the line of the wanted subscriber. and-itheiconversation can proceed.

It the wanted subscriber should be engaged when the wipers olithe switchWS'are set onto the wanted linethe test relay t1 will not be enbusy tone produced by the busytoneapparatus 182,183will be sent through the contacts 181,177, contact 172,173,,contac'ts 101,

, ergized as; as previouslydescribed and, the

lay 1 13. If the relay 82,-shouldnot have been I deenergiz edby the; displacement of; the wipers of the trunk finder TF as previously ex: plained itscircuit also will be openedgat. the contact 108- when the relay 3 is deenergized.

The holding circuit-ofthe test; relay tr which extends through 103, and the contact 299 is I Should I the; calling subscriber abandon a callwhilewipers of the transitorily used switehiF are stil l set; on his line the impulse relay-35 willrbe deenergizedtoopen the circuit of: the relay, 0" The contact 3 1; which is thenclosed closes the circuit of'the relay 30 i to open the Contact 19 and deenergize the re lay 2 1 and, ifthe units designating switch Si should have been-displacediby numerical i n pulses this switch S willalso be restored t-o norxnalby, impulses that flow from the posi 1311 85 pole through 2', 11, 200,191, driving mag-j net121tothe negative pole. When therelay I I 51;.is deenergizedon-the energization of the- 'testrelay tr-the aun iliary switch Sg'ot' the linain switch sVVS is in'nnediately restored by a impulses that flow .from the' negative pole through the magnet of Sg, wiper 59, contact strip 300, contact 190, interrupteri -to the 7,

positive pole; While the auxiliary switch S9 e is being restored the. circuit of theydriving magnet'68is kept open at thepoint 299; by a contaet controlled by the test relay in Y It willrbe obvious that instead'of providing g a small. number ofisecondary' designating switches or units deslgnatlng switches 'S" which are common to a group of main switches WS a secondary designating switch S may be provided for each main switch. The number of secondary designating switches S will then begreater but the circuit arrangement will thenbe simpler.

It may also be mentioned that the release of the main switch -WS which, as shown in Fig. 1, depends on the deenergization of the a release relay tr, which in turn is eiIected by the deenergization of the relay 3, may be made to depend on the replacement of the called subscribe-rs receiver by means of an auxiliary release relay (not shown) that is operated when the relay 170 is energized and that then prepares a release circuit for WS f and comprising the stepping magnets 317,

334 are associated with the 322 and 333, trunk finder TF. 330 is the impulse relay that receives the dialling impulses from the calling line. When a calling line has been connected through to the wanted line selector and sends in the tens dialling impulses these impulses flow from the minus pole through the contact of the release relay 328, contact 332, 323, stepping magnet 322 (which steps the brushes 319, 326 onto a certain contact, say the third contact 342) to the positive pole. The relay 381 closes the contact 308 and the wanted line connector IVS is then started by a current impulse from the minus pole through 313, operating magnets 312, 308, 310.

to the positive pole. The connector WS now shifts its wipers 310, 311 causing the wiper 310 to contact with the contact strip 65. When the wiper 310 leaves the initial contact the relay 381 is deenergized, but impulses continue flowing through 313, 312, 307, 65,

310 to the positive pole. The wipers 310, 311 are thus kept moving-and whenever thewiper 310 encounters a new strip 65', 66, 67 an i impulse is sent from the positive pole through 310, 305, 300 (operating magnet 317) to the negative pole. Theimagnet 317 moves the wiper 318 until it reaches the contact 341 corresponding to the contact 342 onto which the wiper 319 has been set by the tens impulses. The relay 304 is then energized by a current from the positive pole through 310, 304, 316, 301, 318, 341, 342, 319, minus pole. The magnet 317 then has its circuit opened at and at the same time the positive pole is connected through 310, 306, to the Wiper 311. Each time the wiper 311 encounters a new units contact animpul se is sent through 310,306, 311, e14, e02, 337, 33a to the minus pole. In the meantime the units connecting impulses will havecome in and caused the operating magnet 334 to step the wiper 336 onto a certain contact, say 340. When the wiper 335 reaches the contact 339 corresponding to 340 an impulse will fiow through 310, 306, 381, 303, 338, 339, 340, 336 to the negative pole and the relay 381 will then open the circuit of 312 and stop the wipers IVS on the particular line that has been marked by means of the wipers 336 and 319. Iclairni 7 f 1. In a telephone'system; lines impulse transmitters associated with said lines; a conversational switch with fixed contacts connected to said lines, movable contacts, and operating means for operating said movable contacts; an impulse receiving designating switch adapted to be set by a said impulse transmitter; starting means for starting said operating means immediately impulses commence being sent into the impulse receiving switch from a said impulse transmitter; and means for controlling the operation of said movable contacts in accordance with the setting ofthe impulse receiving designating switch.

2. In a telephone system; lines; impulse transmitters associated with said lines; a conversational switch with fixed contacts connected to said lines; other fixed designating contacts, movable contacts cooperating with said designating contacts, and operating means for operating said movable contacts; an impulse receiving designating switch with contacts connected to said designating contacts and adapted to be set by a said impulse transmitter; starting means for starting said operating means immediately impulses commence being sent into the impulse receiving switch from a said impulse transmitter; and means for controlling the operation of said movable contacts in accordance with the setting of the impulse receiving designating .contacts connected to said designating contacts and adapted to be set by a said impulse transmitter; starting means for starting said operating means immedlately lmpulses commence being sent into the impulse receiving sw tch from a said impulse transmitter; and

means for controlling the operation of said movable contact in accordance with the setting of the designating switch. f a

4. In a telephone system; lines; impulse transmitters associated with'said lines; a

conversational switch with groups of sets of fixed contacts connected to said lines, a fixed group designatmg contact allotted to each said group, a movable-contact adapted to cooperate with the group designating con 7 tacts and moving means for moving the 'movable contact over the group designatmg contacts, an impulse receiving designating switch with bank contacts connected to said designating contacts, a movable Contact adapted to cooperate with the bank contacts, and means for setting the movable contact on a desired bank contact in response'to impulses from an impulse transmitter; start ing means for starting the operation of said moving means immediately impulses from a said impulse transmittercommence affecting the designating switch; and means for controlling the operation of the" movable contact of the conversational switch in accordance with the setting of the movable contact that cooperates with said. bank contacts.

5. In a telephone system; lines; impulse transmitters associated with said lines; a rotary step-by-step conversationalsW-itch provided with groups of sets of fixed contacts operation of said stepping magnet as soon as impulses from a said impulse transmitter commence affecting the designating switch; and means for controlling the operation of the rotatable contact of the conversational switch in accordance with the setting of said rotatablebrush.

6. In a telephone system; lines; impulse transmitters associated with saidglin'es; a

rotary step-by-step conversational switch provided with groups of sets of fixed con tacts connected to said lines,a fixed group designating contact allotted to each said group, a contact-set designatingcontacttor ed to cooperate withthe group designating contacts, a second rotatable contact adapted to cooperate with the contact-set designating contacts, and a driving magnet for driving the rotatable contacts; a primary impulse receiving group-designating switch provided with bank contacts connected to said group designating contacts; a rotatable brush adapted to cooperate with bank contacts and a brush-moving magnet for setting the brush in response to impulses "from an impulse transmitter; starting means for starting the operation of said driving'magnet as soonas the transmission or" ii'npu-lses from said line to a conversational switch commences; means for controlling the operation of the rotatable contact ot the con-- versational switch in accorda ce witht-he setti'ngoi said rota't-ablebrush; and a secoinla designating switch for controlling the motion of said impt'ilse receiving contact-set second rotatable'contact.

7. In a telephone system; l1nes;'1n1pulse transmitters associated with said lines; a r0- tary step-by-step conversational switch provided with groups of sets of lined con-tacts connected to said lines, a fixed group desig halting contact allotted to each said group; a contact-set designating contact for each contact set, a rotatable contact adapted to cooperate with the group designating contacts, a second rotatable contact adapted to cooperate with the'contact-set designating contacts, and a driving magnet for driving the rotatable contacts; a primary impulse receiv ing group designating' switch provided with bank contactsconnected tosaid group dcsig' nating contacts, a rotatable brush afd a 'ited to cooperate with bankcontacts and a brushmoving magnet for setting thebrush in re'-' sponse to impulses from an impulse transmitter; starting means for'starting the operation of said driving magnet ass con as the transmission o'fimpulses from a said line to i a conversational switch commences; means for controlling the operation of the rotatable contact of the conversational switch in accordance'with the setting of said rotatable brush; i and a secondary impulse-receiving contact-set designating switch comprising individual bank contacts connected to said contact-set designating contacts,a wiper adapted to cooperate with said individual bank contacts, and a wiper-moving magnet ton setting'the wiper; and means for controlling versational switch comprising fixed contacts 1 connected to said lines and divided into groups and members for selecting contact groups, an impulse receiving-group desi each contact set, a rotatable contact adapt-nating device for controlling the selecting operation of said 'members in accordance starting the operationof said "members as soon as impulses commence being sent from a f said transmitter.

9. In a telephone system; lines; impulse conversational switch comprising fixed con tact sets connected to said lines and divided received; a'secondary impulse-receiving-contact-set designating device .for controlling the selecting operation oi a said member to select an. individual contact-set in accordance with impulses received; and means for starting the operation of the conversational switch as soon as impulsesitor controlling it commence being receiv d.

10. In a telephone system; lines; impulse transmitters associated with said lines; conversational switches each comprising fined contact sets connected to said lines and divided into groups and members for selecting a group of contact sets and any individual set in a group; a primary impulse-receiving group designating device allotted to each conversational switch for controlling the selecting operation of a said member to select a said group in accordance with impulses received; secondary impulse-receiving contact-set designating devices common to a group of conversational switches for controlling the selecting operation of a sa d member to select an individual contact-set in accordance with impulses received; and means for starting the operation of the conversational switch as soon. as impulses for controlling it commence being received.

11. In a telephone system; lines; impulse transmitters associated with said lines; conversational switches each comprising fixed contact sets connected to said lines and dinating device with any conversational switch;

12. In a telephone system; lines; impulse transmitters associated with said lines; conversational switches; group designating means associated with each switch "for controlling it to select a group of lines in accord ance with impulses sent from a said transmitter; and a device common to a plurality of conversational switches for controlling any switch to select any individual line in agroup in accordance with impulses sent from a transmitter and means for starting the operation or" a conversational switch immediately upon the receipt of numerical impulses by a group designating means.

13. In a telephone system; lines; impulse transmitters associated with said lines conversational switches; group designating means associated with each switch for controlling it to select a group of lines in accorr ance with impulses sent from a said transmitter; and means for starting the operation of a conversational switch as soon as impulses for controlling it commence being received by a group designating means.

14:. lna telephone system; lines; impulse transmitters associated with said lines; conversational switches; group designating means for controlling a conversational switch to select a group of lines in accordance with impulses sent from a transmitter; and means for starting the operation of a conversational switch as soon as impulses for controlling it commence being received byra group designating means. e

15. In a telephone system; lines; impulse transn'iitters associated with said lines; conversational switches for selecting groups of said lines and provided with a selecting incinher that is movedto select a said group only when the second or a higher group oflines is to be selected ;and impulse-receiving group designating means for controlling the conversational switches to select a group of lines in accordance with impulses received; and a starting means for starting the operation of a conversational switch as soon as a group designating meanscommences receiving impulsesfrom a said impulse transmitter.

16. In a'telephone system a calling line called lines register mechanism comprising a step-by-step switch for registering the numerical'ldesignation ot a called line, a con-' nector switchhaving contacts in which the called line terminates, said contacts being arranged in groups with a group designating contact for each group means responsive to the setting of said register for electrically marking the group designating contact of the called line and for also electrically mark ing the particular called line individually'in the group andmeans for causing the brushes of said connector to first hunt for the marked group contact and then ffOltllGD'lfiIliGClllIlG contact. I

In testimony whereof I have afiixed my signature.

: FRITZ ALDE'NDORFF.

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