US1640473A - stehljk - Google Patents

Description

Aug) 30, 1927. 1,640,473

R. F. STEHLIK I 1 IMPULSE SENDER Original Filed un 9. 1924 5 Sheets-She 2 *Inusn m:

Bub 131 221 F. 57521 71 5 1,640,47 30 R. F. STEHLIK 3 IMPULSE SENDE'R Original Filed June 9, 1924 5 Sheets-Sheet 3 frz Y 5% 4/ Inuarr mu-' Ending uh F. SEEM:

1927- R. F. STEHLIK IMPULSE SENDER Original Filed Jun 9. 1924 5 Sheets-Sheet 5 WW 11m NNN Eur/7:2 h E 52511111:-

Patented Aug. 30, 1927. I

UNITED STATES PATENT errici i RUDOLPH IF. STEI-ILIK', OF CHICAGO, ILLINQIS, ASSIGNOB, BY MESNE ASSIGNMENTS, TO AUTOMATIC ELECTRIC INC OF CHICAGO, ILLINOIFa, A CORPORATION OF DELA- WARE.

Application filed June 9, 1824, Serial No. 718,683. Renewed December 29, 1926.

The present invention relates in general to impulse senders but is concerned more particularly with impulse senders used in telephone systems and more especially those which employ a progressively movable switch mechanism to count the impulses as they are sent or transmitted.

The main object is the production of new and improved circuit arrangements whereby the counting switch of a sender is provided with a plurality of normal positions to avoid the necessity of rotating over all the remain ing positions when a series of impulses comprising only a small number of impulses is transmitted. For example, impulse senders are ordinaily designed to send out a maximum ot ten impulses and have, in addition to one normal position and one pick-up position, ten sending positions. Now in case a series of impulses comprising only three im pul es, for example, is transn'iitted, it is necessary, at the end of the series,to advance the sending switch through its remaining seven positions before its normal position is reached.

In order to cut down this large amount of wasted movement, which is the cause of a large amount of wear and tear on the switch e-chanism itsielf and is also the cause of wasted time between successive serles of 1mpulses, a novel circuit arrangement has been provided which allows for a second normal position at which the sending mechanism may be stopped at a halt way point. Now, a in order to prevent the sending mechanism from being out of step when it is started from this second normal position, it is provided with a second control wiper which is :uitomatically connected up and used instead 4 oi? the normal control wiper when the switch is started from its intermediate normal position.

Although senders of the above type may be used for any one of a number of purposes and in connection with any one of a number of devices, it has been chosen to illust "ate the sender in connection with a socalled director which is employed in a multi-o'liice automatic telephone system primarily to promote trunking cfficieney by permitting calls to all oflices in the same locality to be handled over the same group of trunks regardless of their numerical desig nation. l eee directors are used to register n: a number to retrans mit the proper code to trunk the call to the desired oiiice in accordance with the most ecoi'iomical trunking arrangement and to register and retransmit unchanged the tour subscriber digits of a number.

Although the director as a whole does not form any part oi this invention, but is used merely toillustrate one use for the new and improved sender, it is, nevertheless, an object of the invention to combine the new and improved sender with the remaining part of the director so that the'entire director functions as a unitary organization.

Referring now to the drawings comprising Figs. 15, inclusive, they show by means of the usual circuit diagrams, a suflicient amount 01 apparatus in a system embodying the principlesof invention to enable the invention to be understood and its utility appreciated.

Fig. 1 shows the substation A of which the associated line terminates at the exchange in the line switch C, which has accessthrough the trunk circuitTC to the first selector 1). This drawing shows also the director selector DS.

Figs. 2-5, inclusive, show a director which is one of the group accessible to the director selector DS, Fig. 1. The portion of the director shown in Fig. 2 comprises the se quence switches S and S which are used respectively to control the registrationandthe retransn'iission0t the impulses; the portion of the director shown in Fig. 3 comprises the new and improved sender which sends out the correct number of impulses for each digit, starting from either of its two normal positions impartially; the portion of the director shown in Fig. 4L comprises the oflice register OR and the intermediate distribut ing trame IDF by means of which the oliice codes may be readily changed; and the portion otthe director shown in Fig. 5 comprises the digit registers DR DR inclusive, which are used to register the four subscriber digits in a number.

Regarding theequipment involved in the present disclosure, it may be stated that the substation A, Fig. l', is of the usual automatic type; the line switch C, Fig. 1., together with the director selector DS, the "Witch S, Fig. 2, and the sending 3, is of the well in? wu I '7 \ck rota. y 9e or witch in which the red in ftorward directit.

are advanced upon the back stroke of the stepping magnet rather than upon the front stroke; the selector D, Fig. 1, together with the ofiice register'OR, Fig. 4, is an automatic switch of the well known vertical and rotary type and its bank contacts are accordingly arranged in horizontal rows or levels; and

the sequenceswitch S, Fig. 2, together with the digit registers DR DRfl inclusive, Fig. 5, is of a simple type of switch having wipers which are advanced in a forward direction by the stepping magnet 105 and whichare restored to normal by the release magnet 106 under the control of the contacts 107 which close when the wipers 108 and 109 are first moved "from their normal position and which open again when the wipers are subsequently restored to their normal position.

A detailed description of the operation of the apparatus shown will now be given. For this purpose it will be assumed that the subscriber at substation A, desiring to make a call, removes his receiver. \Vhen this occurs, a circuit is closed over line conductors 11 and 12 for line relay of the line switch C, whereupon line relay 15 energizes; places ground 'on private normal conductor 13 at armature 23, thereby making the calling line usy imn'iediately and closing a circuit through switching relay 14 and stepping magnet 16 in series; and at armature 24 connects test wiper 21 to the junction of switching relay 14 and stepping magnet 16.

From this point the operation depends upon whether the trunk terminating in the bank cont-acts upon which the wipers of the line switch are standing is busy or idle. Assuining first that the trunk is idle, switching relay 14 energizes immediately, seizing the trunk.

Assun'iingnow that the trunk upon which the wipers of the line switch are standing is busy, switching relay 14 is short circuited by "he ground potential encountered on the busy test contact by test wiper 21 and does not energize. interrupts its own circuit, is operated from this same ground potential through test wiper 21'and advances the wipers 22, inclusive, step by step in search of an idle trunk. Vhen an idle trunk is reached, which trunkyit will be assumed,,is the one comprising conductors 27, inclusive, there is no ground potential encountered upon the test contact thereof 'bytest wiper 21, and switching relay 14, being no longer short circuited, energizes. Stepping magnet 16, however, does not energize at this time, on account of the high resistance of switching relay 14. Upon energizing,switching relay 14 disconnects test wiper 21 from the junction of its own winding and that of stepping magnet 16 and connects it to thegrounded private normal conductor 13 at'armature 18,

Stepping magnet 16, which thereby making the seized trunk busy immediately, and at armatures 17 and 19 disconnects the line conductors 11 and 12 from the windings of line relay 15 and ground, and extends them way of wipers 20 and 22, the bank contacts upon which theyare standing, conductors 25 and 27, and the resting contacts and armatures and 41 to the windings oi" the double wound line relay 31 of the trunk circuit TC. Line relay 31 now energizes over the calling line and closes at armature 34 a circuit for release relay 32, whereupon release relay 32 energizes and places ground upon release trunk conductor 26, at armature 36 thereby completing the usual holding circuit for switching relay 14 of the line switch C before the slow acting linerelay 15 has had time to dcenergize.

As a further result of the energization of release relay 32, it closes at armature 37 a circuit for switching relay 81 and stepping magnet 82 ot' the director selector DS in series, and at armature 38 connects test wiper 89 to the junction of the said switching relay and stepping magnet. Accordingly, the director selector DS operates in the same manner as already explained in connection with the line switch G to select an idle director. Assuming that the director reached by 'way of conductors 91-94, inclusive, is the first one found to be idle, the wipers 87 90, inclusive, are rotated and stopped in engagement with the bank contacts in which the said conductors 9194, inclusive, terminate, whereupon switching relay 81 energizcsand grounr 5 test wiper 89 at armature 85, thereby making the seized director busy ii'i'unediately. As a further result of the energization of switching relay 81, it prepares the operating and switching circuit at armature 86; and at armatures 83 and 84 connects up wipers 87 and 88, thereby placing a closed bridge across conductors 42 and 44 of the selector D. This closed bridge ineludes conductors 91 and 92, and armature 208 and its resting contact of relay 202, Fig. 3, and contacts 233 of the sending switch SS in multiple. Responsive to the closure ofthis bridge, line relay 51 of the selector D energizes and closes a circuit for release relay 52 at armature 62, whereupon release relay 52 energizes also, preparing the selec'tor for-operation in the usual manner.

In'the director, the holding relay 201. Fig.

3, is energized over test conductor 93 responsive to the latter being grounded through wiper 89 of the director selector- DS, and at armatures 206 and 207 opens the two release circuits of the director.

hen the calling subscriber manipulates his calling device in accordance with the first digit in the dcsirednumber, the circuit of line relay 31 of the trunk circuit TC is opened a corresponding number of times.

Upon each of the resulting dcenergizacions of line relay 31, it closes at armature 85 a circuit. for the vertical magnet. 301 of the oiiice register OR, Fig. 4, as follows: From ground by way of the resting contact and armature .35 ot the line relay 31, armature 80 and working contact wviper 90, con doctor 94-, slow acting series relay 101, Fig. 2, wiper 109 01? the sequence switch S, the vertical. magnet operating conduct-or 115. and vertical magnet 301 01 the otlice register OR to battery. By the operation oi? vertical magnet 301, the wipers 304%307, inclusive, of the otlicc register (Ht are raised step by step and come to rest opposite the desired level of bank contacts. Relay 101. Fig. 2 is cnern I t, 7

gized in series with the vertical magnet and, being slow acting. maintz'iins its armature attracted throughout the. series out impulses. Upon energizing, relay 10.1 closes at armature 1.03 a circuit for the slow acting relay 102 which thereupon energizes and prepares at armature 10 a circuit for stepping magnet 105 of the sequence switch S.

At the end 01? the series of impulses transmitted to the vertical magnet ot the oti'ice register, slow acting series relay 1.01 dcenergizes and closes'at armature 1.03 the circuit 01: stepping 111215;11011105 of the sequence switch S, whereupon the stepping magnet 105 energizes and advances the wipers 108 and 109 into engagement with the second set of bank contacts. A moment later, the slow acting relay 102, whose circuit is opened by armature 103, deenergizes and opens the circuit of magnet 105 at armature 104.

The impulse distributing wiper 109 of the sequence switch S is now in engagement with the bank contact associated with the "otary magnet 302 of the office register OR.

Accordingly, when the calling subscriber mai'iipulates his calling device in accordance with the second digit in the desired number, the resulting series oi impulses is trans mitted over the circuit above traced to the said wiper 109 of the sequence switch S and thence by way of the second associated bank contact. and conductor 11.0 to rotary magnet ing the sender in a manner to be pointed out hereinafter.

When. the first subscriber digit is dialled,

assumed, arethc contacts hang up prematurely.

the stepping magnet 401 of the first digit register DB Fig. 5, is operated through wiper 109 of the sequence switch S, Fig. 2, and over conductor 121- and advances the wiper 40st into engagement "with the bank contact corresponding to the digit dialleifl. In the same way, responsive to the second, third, and fourth subscriber digits, the digit registers DB DB and DB respectively, are operated overv conductors 122, 123 and 12 1, respectively, and each advances its wiper into engagement with the bank contact corresponding to the number of impulses received. I Returning now to the point at which wiper 108 of the sequence switch S connected up the interrupter 114 to the conductor 110, the stepping magnet 231 of the sending switch 355 is thereafter operated tl'irough the resting contact and armature 213 under the control of interrupter 114-. Upon the first ener- Zation of stepping magnet 231, the associateci armature is attracted and moves the pawl into engagement with the next notch in the wiper driving ratchet wheel. but does not move the wipers 23-'l-23'7, inclusive. The armature of stepping magnet 231 also opens the sending contacts 233., but the bridge across conductors 91 and 92 is not opened at this time owing to the fact that the contacts 232) are shunted at the resting contact and armature 208 of pick-up relay 202. Upon the subsequent deenergization stepping magnet 231, the wipers 234337. inclusive, are advanced into engagen'ientwith the next set of bank contacts. \Vhen this occurs, wiper 255 opensthe initial circuit oii relay 205 which was formerly closed through wiper 235 and the resting contact and armature 209, leaving relay 205 locked up through armature 21S) and. its working contact. Accordingly, relay 205 maintains the stopwipcr 236 which is the one to be used when the sender is started from the norn'ial position shown.) connected. with stop relay 203 at arn'iature 220. and maintains contact 238 in the bank 011' wiper 234.- grounded at armature 2185-45) as toprevent wiper 23 1 from losing ground. in case itrotates over contact 238 during the transmission of the series of impulses.

As a further result ot the advance of the wipers of the sending switch, wiper 23 1 en a grounded contact, whereupon picle up .re lay 202 energizes and removes at armature 208 the shunt from around contacts 233 of the sending switch. Relay 202 also places an auxiliary ground on conductor 9 at armature 209 so to maintain the director busy until the sender has completed its operation in case the calling siiiloscriher should It a further result of the energization of pick-up relay 202, i closes at armature 210 circuit over conductor 118 forthe stepping magnet'lll loo the sequence switch S, whereupon stepping magnet 111 energizes preparatory to advancing the associated wipers.

With the shunt removed from around the sending contacts 233 of the sending switch SS, each of the subsequent ene-rgizations of stepping magnet 231 results in an opening of the bridgeacross conductors 91 and 92, the wipers or the sending switch being advanced in the usual manner upon each subsequent 'deenergization. Now, upon referring to Fig. wiper 301 of the oilice register OR is in engagement with the bank contact 308, which is cross-conneced on the intermediate distributing frame IDF by means of the jumper 312 to the third impulse stop conductor 3. Accordingly, the first code digit to be transmitted is the code digit 3, and, when three interruptions have been produced in the bridge across conductors 91 and 92, the stop wiper 236 of the sending switch is advanced into engagement with the bank contact in which the third impulse stop conductor 3 terminates, and stop relay 203 energizes over the following circuit: From ground by way ofthe stop conductor control wiper 113 of the sending control sequence switch S, Fig. 2, the first associated bank contact, the first code digit stop conductor 131, wiper 30 of the oflice register OR, bank contact 308, jumper 312 of the intermediate distributing frame IDF, the third impulse stop conductor 3, the corresponding contact in the bank of wiper 236 of the sending switch SS, Fig. 3, armature 220 and its working contact, and stop relay 203 to battery. Upon the closure of this circuit, stop relay 203 energizes and shunts the sending contacts 233 at armature 211, thereby terminating the transmission of impulses. Relay 203 also opens the circuit 01' stepping magnet 111 of the sequence switch S and closes a locking circuit for itself at arn'iature 21 1; shifts at armature 213 the circuit of stepping magnet 231 from the interrupter lead 110 to wiper 23 1 through the interrupter contacts 232; and at armature 212 opens the locking circuit of relay 205. incidentally removing the ground potential from bank contact whereupon relay 205 deenergizes.

As a result of the opening of the circuit of stepping magnet 111 of the sequence switch S at armature 2141-, stepping magnet 111 deenergizes and advances the wipers 113 and 114 into engagement with the second setoi bank contacts, and as a result of the shifting of the circuit of stepping magnet 231 of the sending switch SS at armature 213, stepping magnet 231 is operated through wiper 234 and interrupter contacts 232 and advances its wipers step by step until wiper 234 engages the bank contact 238, which is at this time ungrounded. The wipers of the sending switch SS are now at their'intermediatenon 1 it *ill be noted that the first mal position and the circuit of pick-up relay 202 is open on account of the fact that wiper 23-1 is in engagement with an ungrounded bank contact. Relay 202, however, being slow acting, does not deenergize imn'iediately.

In the selector D, Fig. 1, as a result of each of the three interruptions produced in the bridge across conductors 91 and 92 in the director, line relay 51 deenergizes and closes at armature 62 a circuit through armature 64 and its working contact and series relay 53 for vertical magnet 61. By the operation of vertical magnet 61, the wipers 72-7 1, inclusive, are raised step by step and come to rest opposite the third level of bank contacts. Relay 53 is energized in series with vertical magnet 61 and, being slow acting, maintains its armature 65 attracted throughout the vertical movement. Upon the closure of the oil normal contacts, a circuit is completed from the grounded release trunk conductor 13, through armature 65 and its working contact, and through the interrupter contacts 59 of rotary magnet 58 for stepping relay54, which thereupon energizes and closes alocking circuit for itself at armature 66, and prepares a circuit for rotary magnet 58 at armature 67.

At the end of the vertical movement, the slow acting series relay 53 deenergizes and completes the circuit of rotary magnet 58 at armature 65, whereupon rotary magnet 58 energizes and advances the wipers 72*74, inclusive, into engagement with the first set of bank contacts in the selected level, and, near the end of its stroke, opens the circuit of the stepping relay 54; at its interrupter contacts 59. Stepping relay 54L thereupon falls back and opens the circuit of rotary magnet-58 at armature 67, whereupon rotary magnet 58 deenergizcs and closes its interrupter contacts 59 again.

From this point on, the operation depends upon whether the trunk terminating in the first set of bank contacts is busy or idle. If it is idle, switching relay 55 energizes, seizing the trunk. Assuming, however, that the trunk is busy, switching relay 55 is short circuited by the ground potential encountered upon the busy test contact by test wiper 73, and stepping relay 5 1 energizes through test wiper 73 and again completes the circuit of rotary magnet 58 at armature 67 whereupon rotary magnet 58 energizes alsoand advances the wipers into engagement with the second set of bank contacts.

This alternate operation of stepping relay 54 and rotary magnet 58 continues as described until an idle trunk is reached, which trunk, it may be assumed, is the one comprising conductors 75;'Z7, inclusive. When this idle trunk is reached, switching relay 55, being no longer short circuited, energizes from ground on the grounded release trunk conductor 43 and in series with rial contacts 00, interrupter contacts 59, and stepping relay 54, but stepping relay 54 is not operatively energized at this time on account of the high resistance of switching relay Upon energizing, switching relay 55 opens the test circuit and prepares the usual holding circuit at arn'lature 69; disconnects ground from armature 62 of the line relay 51 at armatiiu'e 70, thereby opening the circuit of the slow acting release relay 52; and at armatures 68 and 71 disconnects conductors 42 and 44 from the windings of the line relay 51 and extends them by way of Wipers 72 and 74, the bank contacts with which they are in engagement, and conductors 75 and 77 to the line relay of the selector switch associated with the seized trunk. The line and release relays (not shown) of the seized selector now energize and the latter places ground on release trunk conductor 76, thereby grounding the release trunk conductor 43 of the selector D through wiper 7 3 and armature 69 and its working contact to maintain the holding circuit closed nvi'terthe slow acting release relay 52 of the selector 1) has deenergized and also after the mleas-te relay 32 of the trunk circuitTC has deenergized, as it does subsequently.

in the director, the slow acting pick-up relay 202 falls back at the end of the interval for which it is adjusted and opens the circuit of slow acting stop relay 203 at armature 210. Stop relay 203 also maintainsits armature attracted. for an interval after its circuit is opened, at the end of which it will fall back and start the sender again as will\ be pointed out. The interval required for the relays 202 and 203 to fall back one after the other is made use ot by the selector D to pertorm the clnlinge-over and lll'tll'llirhlll'lliin g operations ELbOVt described. As a further resi'ilt oi the deeuergization of the slow actinn; pick-up relay 202, it replaces ground on wiper of the sending switch SS,-thereby completing a circuit through bank contact ior relay 204. Relay 204 thereupon z-niergiacs and prepares a locking circuit for itself at armature 216. and at armature 217 connects up the stop wiper 237 with the stop relay 203. 1

At the end oi. the time for which it is adjusted, relay 203 deenergizes and closes at :u'mature 212 a locking circuit through the working contact and armature 216 for relay 204, at the same time connecting ground through al'l'l'lfitllle 215 and its working contact to the first contact in the bank of wiper 234 so as to prevent the said wiper 234 from losing ground in case it passes over such conta 5t (hiring the transmission of the next (1 '11. As a further result of the deener- ./ation of relay 203, it again connects stepping magnet 231 of the sequence switch SS to the interrupter 114, Fig. 2, through conductor 110, thereby starting the sender-for gized through its locking circuit which in-- eludes armatures 212 and 216; closes a circu t at armature 210 and over conductor 118 for thestepping magnet 111 of the sequence switch S; andat armature 208 removes the shunt from around the sending contacts 233 of the sending switch SS. Accordingly, upon each of the following e'nergizations of stepping magnet 231, the bridge across conductors 91 and 92 is opened at the sending contacts 233. p v

I At the end of the fi fth interruption produced in the bridge across conductorslfll and 92 by stepping magnet 231 stepping magnet 231 deenergizes and closes'the bridge again and; again advances the wipers 234-237, inclusive Wiper 237, at this time engages the bank contact in which the fifth impulse stop conductor 5 terminates, thereby closing a circuit for stop relay 203 fol lows: From ground by way of stop conductor control wiper 113 of the sequence switch Si, Fig.2, the second associated bank contact, the second code digit stop conductor 132, wiper 305 of the ofiice register OR, bank contact 309, jumper 313, the fifth impulse stop conductor 5, the associated contacts in the bank of wiper 237 of the switch SS, armature 217 and its working contact, and stop relay 203 to battery. Upon energizing, stop relay 203 opens at armature 214 the circuit of the stepping magnet 111 of the sequence switch S and closes a locking circuit for itself; places a shunt around the interrupter contacts 233 of the sending switch at armature 211; and at armature 212 opens the locking circuit of relay 204. whereupon relzy 204 deenergizes. As a further result of the energization of stop relay 203, it disconnects stepping magnet 231 from the interrupter lead at armature 213 and connects it through the interrupter contacts 232 to the wiper'234. However, the wipers of the sending switch are not adicinced at this time, owing to the fact that they are now in one of their normal positions, ground being removed from the first contact in the bank of wiper 234.

Responsive to the transmission of the second code digit 5, the selector switch asse lit) lit

ciated with the trunk seized by the selector D, Fig. 1, operates in the usual manner to raise its wipers to the desired level and selccta trunk leading to the called oilice.

After the usual interval, relays 202 and 203 fallback one after the other to start the sender to transmit the next digit.

Returning now to the point at which the circuit of the stepping magnet 111 of the sequence switch S was opened at the end of the second code digit, stepping magnet 111, upon deenergizing, advances the wipers 113 and 114 out of engagement with the second set of bank contacts and into engagement with the third set, whereupon wiper 113 grounds the third code digit stop conductor 133. Since only two code digits are needed to trunk the call to the desired office in this case, the third and fourth contacts 310 and 311 in the set of contacts in use are cross-connected by means of the jumpers 314 and 315, respcctively,to the skip conductor 316. Accordingly, when the third code digit stop conductor 133 is grounded by wiper 113, a circuit is closed through Wiper 306, bank contacts 310, jumper 314, skip conductor 316, and the interrupter con tacts 1 12for stepping magnet 111 of the sequence switch S, Which thereupon energizes and interrupts its own circuit at contacts 112, whereupon it deenergizes and advances the wipers 113 and 114 another step. Viper 113 at this time extendsground over the fourth code digit stop conductor 134 to the fourth office register wiper 307, and thence by way of bank contact 311, jumper 315, and skip conductor 316 to stepping magnet 111 by way of interrupter contacts 112. Accordingly, the wipers 113 and 114 are automatically advanced another step and Wiper 113 places ground upon the first subscriber digit stop conductor 141. v

When the sender is started the third time, as it following the usual interval after the second digit, it transmits the first subscriber digit. which is registered on the digit register DB This digit is terminated in the hereinbefore described manner wlicn wiper 236 of the sending switch SS arrives upon the impulse stop conductor upon which wiper 404 of the digit register DB is standing. In case the first subscriber digit is 5 or under, thewipers of the sending switch SS are not advanced beyond the intermedi ate normal position and the transmission of the second subscriber digit commences with stop wiper 237 connected-up by relay 204, but, if the first subscriber digit G or over, the wipers of the sending switch SS are rotated back to the initial starting position and the transmission of the sec- .ond subscriber digit starts with the stop wiper 236 connected up by relay 205. At any rate, at the end of the first subscriber digit, the wipers of the sequence-switch S are advanced to ground the second subscriber digit stop conductor 142 to terminate the second subscriber digit, as determined by the setting of the digit register DR In the same way, the wipers 113 and 114 of the sequence switclrS are advanced at the end of'the second subscriber digit, and ground is extended over the third subscriber digit stop conductor 143 to the wiper of the third digit register DR thereby terminating the third subscriber digit in the usual manner, and, upon the advance of the wipers of the sequence switch S at the end of the third subscriber digit, ground is extended over the fourth subscriber digit stop conductor 144 to the wipers of the fourth digit register DB thereby terminating the fourth subscriber digit in the usual manner.

At the end of the transmission of fourth subscriber digit, the wipers 113 114 of the sequence switch S are again vanced in the usual manner and wiper 113 places ground upon conductor 94, thereliiy closing a circuit through the corresponding contact in the bank of wiper of the director selector DS, wiper 90, working contact and armature 86, and armature and its working contact for switching relay 33 of the trunk circuit TC. Switching relay 33 tl'iereupon energizes; closes a locking circuit for itself at arn'lature 40; and at a matures 39 and 41 disconnects conductors 25 and 27froin the windings of line relay 31 and connects them instead to conductors 42 and 44 extending to the selector D, at the same time disconnecting the control bridge extending to the director, leaving the (25+ tablish'ed connection under the direct con trol of the calling line.

As; a result of line relay 31 of the trunk circuit TC being cut ofi', it deenergizes and opens the circuit of release relay 32 at armr-u ture 34. Responsive to this release relay 32 deenergizes after a slight interval and removes ground from rel-ease trunk coi. uctor 43 at armature 36, leaving the said release trunk conductor 43 grounded by way of the release trunk conductor 76 of the trunk comprising conductors 75-77, inclusive.

As a further result of the deenergization of the release relay 32, it opens at arn'iature 37 the circuit of switching relay 81 of the director selector D x'vh'ereupon switching relay 81 deenergizes and disconnects the wipers 8190, inclusive In the director, holding relay 201 now deenergizes andfplaces ground on the bank of wiper114 oft-he sequence switch S at armature 117, thereby closing a circuit throu ifh the last contact in the bank of wiper 114 for the stepping magnet 111, whereupon stepping magnet 11 1 energizes and opens its own circuit at contacts 112, thereby deenergiziug and advancing the wipers 113 and 114 the remaining step to their normal po ition. As a further result of the deenergization of the and for operating sa-id switch to count a train of impulses, and means i'or stopping said switch in one or the other of its starting positions depending on the number of impulses in the train.

G. In an impulse transmitter, a counting switch having a plurality of starting positions, means for operating said switch to count a train of impulses, means for rendering ine'ti'ective any starting position reached during the counting of a train of impulses, and means responsive to the completion of the transmission of said train of impulses for automatically continuing the advance of said switch to its nearest starting position.

7. In an impulse transmitter, a counting switch having a plurality of starting posi tions, a plurality of test wipers in said switch, means for starting said switch from any position, and means for automatically rendering eli ective the particular test wiper which corresponds to the position "from which the switch is started.

8. In a telephone sy tem, a progressively movable multi-position device "for counting a group of impulses, said device having a number of start positions, Said number being greater than the number of positions on the device divided by the maximmn possible number of impulses in the group.

9. In'a telephone system, a progressively movable nmlti-position device for counting a group of impulses, said device having a number of start positions, said number being greater than the number of positions on the device divided by the maximum possible number of impulses in the group, and means for causing any position on the device to correspond to different digits depending upon from which position the device started in its counting action.

10. In a telephone system, a progressively movable n'iulti-position device for counting impulses, and means for causing each position to correspond to any one of a plurality of dili'erent digits.

1.1. In a telephone system, a progressively movable multi-position device for counting impulses, each position corresponding to a plurality of different digits, said device having a plurality of start positions, and means depending upon from which position the device starts to fix the digitcorresponding to each position of the device.

12. In a telephone system, a progressively movable device -tor counting impulses, said device having a plurality of stop positions, and means for rendering ineffective any stop position reached before a count has been completed.

13. In a telephone system, a progressively movable device for countinga predetermined number of impulses, said device having two stop positions, and means for rendering the first stop position to be reached inefiective if the number of impulses is any amount greater than a certain amount.

14. In a telephone system, a progressive ly movable impulse transmitter wherein there is provided means for initiating the movement of the transmitter to transmit a predetermined number or" impulse, and means effective when the impulses have been transmitted for continuing the movement of the transmitter until it reaches a stop position but rendering it ineffective to transmit additional impulses, characterized in this, that the transmitter is provided with a plurality of stop positions each of which may be reached during the impulse transmitting movement of the transmitter, and means whereby those positions are rendered inetl'ective until the last named means has operated.

15. In a telephone system, an impulse transmitter including means for transmitting impulses and a; counting switch for counting the impulses as they are trans 'i'nitted, said counting switch having a plurality o't normal stopping positions, means for starting said counting switch from any normal position at the beginning of the train of impulses, means for advancing said switch beyond a succeeding normal position in case the number of in'ipulses is greater than a predetermined number, and means for stopping said counting switch at a succeeding position in case the number of impulses is not greater than that predetermined number.

16. In a telephone system, a counting device for counting groups of impulses, said device having a number of stop positions, means for rendering any stop position ineffective, and means for commencing countm from any of said stop positions.

17. In a telephone system, a counting device ior counting a group of impulses, said device having a number of stop positions, means dependent upon the number of impulses counted lior determining in which position the switch will stop, and means for commencing the subsequent operation of the switch from the preceding stop position.

18. In a telephone system, a device for counting a number of impulses, said device having two stop positions, and means for stopping said device in one of said positions if the number of impulses counted is not more than a certain number and in the other position if it is more than said number.

19. In a telephone'system, a progressively movable multi-position device for transmitting impulses, and means for rendering any one of certain of the positions a stop position depending upon which position was the last stop position and the number of impulses that are transmitted.

In witness whereof, I hereunto subscribe my name this 6th day of June, A. D. 1924.

RUDOLPH F. STEHLIK.

Inn

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