US1799485A - Telephone system - Google Patents

Description

April 7, 1931. R. F. s'rr-:l-ILIKl v1,799,485

TELEPHONE SYSTEM Filed Dec. 10, 1928 2 Sheets-Sheet l Eudul hFEl-Llk April 7, 1931. R. F. -ssr-EI-ILIK '1,799,435

TELEPHONE SYSTEM Filed Dec. l0', 1928 2 Sheets-Sheet 2 TO SELECTOR Inventur l l Rum hFEmmk W man? lli) patented4 Apr. '7, 193i UNITED vsrA-'arss P formes y k RUDOLPH E. ,srnHLIx, 0E CHICAGO, ILLINoIs, AssIenoR ,TO RESERVE `r.HOLDING coin- ,RANIL .0E KANSAS cnw; Missen-Rr, A Ic oREoRA'rIon yQE DELAWARE TELEPHONE SYSTEM Application led December '10, `1928. Serial No. 324,816.

vThis invention Arelates general lto auto@ niatsic` telephone systems, more particularly to .such systems in whichrfnder switch .IneCh- Y have employed one oratwo-relays :tor eachline inthe system, :these :relays .being individual to the line and permanently Yassociated with it. When the line initiates fa call @ne .of the relays operates to -,start the finder switch mechanism to V.establish a connection with the line. When the connection :is established the other relay is operated to cut off the first yrelay and clear the line to permit switch operation and conversation. A relay is not an expensive .devi-ce but when -a relayis employed for each line, :a .large ymlmber of such relays are required :in a system of 'any size,

those relays representing an .appreciable part of thetotal ,cost :of vthe system. Itis to the lesseningotithecostoi the system bythe elimf.v

ination of the individual `line relays, this .present .inventionis directed,

`In imycopendi-ng .applications Serial No. 120,547,1iled July 6, 192,6, and Serial No. 229,018, tiled OctoberlQfL i927, I disclose `a finder switch system in which there are `no individual line .or cutfcfi' relays. Instead oi' :using 'the customary relays ,I employ a constantly moving line ,equipment thru the ,operation .ot-,which :a .25' or :50 point finder switch :is operated Y to establish a 'connection with a calling li-ne. The present invention has for its princi-pal object the improvement .O thesystem of my co-pending applications by adapting it for use in a larger telephone that System Wheflelnfinder vswitches are of larger capacity.

veas .an object of my invention PrOVlde a .constantly moving line equipment of 100 line` capacity together with 100 ypoint lfinder switches yand circuit arrangements enabling 'the' line equipment to control the Inders briefly stated, is theV through two motions to establish a ,connec-r tion with a calling line.,-

Further objects ofmy invention not speiciically mentioned here will be best underfv stood from a detailed-reading'of the fclesGlPv tion land claims -which follow.' o

The vv'drawings comprising Figs. 1 and 2, when la-idwith `Fig.'2 to .the right of l with correspondingly --numbered lines in alignment, lshow' .by the yusual .circuit symbols sulicient details to enable a clear understanding of my invention.A v In Fig-1 Ishow the substation-Aand .the details of ythe vban-k assembly of the line equipment. `This line equipment, which maybe of the `type Ashown in my v4copending a.pplicationSerial No.1229,0,18filed Oct. 27, 1927, comprises -five sets of wipers'which are constantlymoving y.over a *Semi,-circularY -rSet of l contacts, there being ,a contact group or each ofthe wipers ineachof ythe sets. Each ywiper hasaccess to 22Lconta`cts, lthose 4con- ,Bythis tacts being `associated with y20 lines. arrangement, theV group ofl 100 flines is periodically tested bythe rotating wipers anda calling one of the lines is answered by the momentary association of auxiliary relays with it through the wipers having ,access .to

that particular line.

In Fig. 2 I show iincler F'which isa well known `rowger two motion 'finder .switch whose wipers move flirst in a vertical direction to'select a level containing a calling line and then in ahorizontal direction to select a particular line inthe level. In the ,present circuits thernovements of the wipers are con? e .trolled solely by the control equipment, `,that

is there are no V:testing functions performed through the wipers Vuntil after they have been set upon a particular vcontact set. 'The finders F are preselected-for use one at a time by distributor D, which r`is a switch mechanism similar to the well'know-n Arotary line sw-itch whose wipers have no normal position but are moved -one step -ztorward upon each'deenergization ot "the 'magnet Associated with the vdistri'bl lt or D are the relays 18.130

`23, inclusive, through the operation oit which the lsettnglno .the nclerswitch 'F 'is controlled after the calling line has been found by the line equipment.

Fig. 2 also shows the relays 1 to 11, inclusive, which are divided into five groups, one for each set of wipers of the line equipment. Relays 1 `and2 are associated with the wipers 30 to 34 inclusive of the first line eqlpipment, the relay 2 being a line relay w ich is thrown across the subscribers loop and energized if that group is shorted, that is if the receiver is off the hook. Relay 1 is a cut-olf relay which is energized each time the private wiper P1 encounters the contacts of a busy line, in a manner which will be pointed out in detail hereinafter.

Similarly relays 3 and 4 are associated with the wipers to 38, rela-ys 5 and 7 with the wipers 39 to 42, relays 8 and 9 with the Wipers 43 to 46, and'relays 10 and 11 with wipers 47 to 50. Relay 5 is common to the entire group of line equipments, and is energized when one of the equipments is taken into use to disconnect the private wipers P1, P2, P3, P4, and P5 from their respective cutoff relays to prevent energization of those cut-off relays until the finder then being operated is completely set.

f :Referring now to Fig. 1 in more detail it will be noted that the wipers 30 to 34, inclusive, have access to lines O1, 91, 81, 71, 61, 51, 41, 31, 21 and 11, and also the lines 02, 92, 82, 72, 62, 52, 42, 32, 22 and 12. In other words these Wipers have access to lines 1 and 2 in each of the ten levelsin the banks of sis , to 42 have access to lines 5 and 6 ineach of the levels. Wipers 43-46 have access to lines 7 and 8 in each of the ten levels and Wipers 47 to 50, inclusive, have access to lines 9 and 10 in each of the ten levels. This arrangement splits up the grouping of the lines so as t0 permit the control equipment to control both the vertical and rotary motion of the finder switch, the control equipment taking not more thanv one half of a revolution, that is the wipers are moved over the 22 contacts available to them during the complete operation of the finder switch. Wiper group 1 comprising wipers 30 to 34, inclusive, contains five wipers, designated as the positive line, negative line, private, the vertical wiper, and the B wiper. The two line wipers positive and negative land the private wiper need no detailed explanation since their function is the same as similarly named wipers in any well known Strowger automatic telephone system. The vertical or V wiper is the wiper through which the vertical movement of the finder switch is controlled and the B wiper is the wiper through which thev rotar movement of the finder is controlled. ince the vertical tiates a call and that the wipers 30 to 50 ro-' tating from left to right encounter the contacts to which the line A is connected. The line relay associated with the wipers 39 and 4 0 will have its circuit closed through the Yhook switch and instrumentalities of the substation A, and finder F, which has'been preselected by distributor D-will be started in search of the callingV line. At the Sametime that wipers 39 and 40 are engaging contact wiper 33 is engaging contact a. Responsive to the energizaticn of the line relay asso-y ciated with these wipers a circuit is completed through the vertical wiper'33 and contact a to the vertical magnet of the finder F, to energize that magnet to elevate the shaft of the finder one vertical step. I/Vipers 30 to 50, inclusiv-e, move on to the right at a uniform rate of speed. As the wiper 33 passes from contact a to contact I) the circuit of the' vertical magnet of the finder F is opened to permit that magnet to fall back preparatory to taking another step. `When the wiper 33 engages contact the circuit of the vertical magnet of the iinder is again closed'and the shaft elevated another step vertically. The operation continues until wiper 33 engages contact 120 at which time the vertical magnet of the finder F has received seven impulses, and the shaft is standing opposite the seventh level of the switch bank. When contact is reached a circuit is completed through the wiper 33 to operate the change-over relaysin the control equipment, thereby opening the circuit of the vertical magnet and closing a. circuit to the rotary magnet of the nder F. As the wipers of the control equipment movel forward wiper 42 which is the B wiper of the line equipment having access to the calling line A will complete a circuit through contact h to the rotary magnet of the finder F to energize vthat magnet to ladvance the wipers of the finder one step in a rotary direction. When wiper 42 moves from contact 7L to i the circuit of the rotary magnet is momentarily opened and again closed when the contact z' is engaged. In this manner the rotaryimpulsing continues until the wiper 42 engages contact 127 at which time live impulses have been delivered to the rotary magnet and the wipers of the finder switch F are standing opposite the fifth contact set in the selected level, that is, opposite the fifth contact set in the seventh level and are in a position to establish a connection to line 75. When contact 127 is be .controlled responsive reached Wiper 42 completes Aa. circuit' for the switchthrough relay of the iinderoperating it to establish a line..` The 'operation of the .switchfthrough relay of the finder controls the .distributor D to step off of the contacts leading to the finder F and to start Vit in Search of another finder in that group, preselecting that iinder and preparing circuits through which it Will to the initiation ot the neXt'call in the line group. Y.

From the foregoing description it Willbe seen .that the vertical vn'iovement of the linder is controlled by the Vnumber of steps that the wiper 38 takes before it encounters the contacts 120 or 121. The'number of steps taken by the finder in aV rotary direction depends upon the B Wiper used 'by the control equipment, and the number of steps that Wiper takes after the line is found and 'beorefit encounters the switch-through contacts. It Will be seen that itis necessary to provide a pair of switch-through contacts for each ot the iive B `Wipers, contacts 123 and 122 operating With Wiper 84to control the rotary movement of the finder when the lirst rgroupV of switches of the control yequipment is in use.` When a call is picked up in the first halfof the bank, 4that isodd-numbered lines, Wiper 34 Iencounters one contact prior to the encountering of contact 123, wiper 38 encounters three contacts prior to 125, Wiper 42 live contacts prior to contact 127 ,and Wiper 46 seven contacts prior to contact 129, and Wiper nine contacts priorto contact 181. vWhen a call is picked .up inthe second halt of the banks of the control equipment, that is a call from an even-numbered line, Wiper 34 en. counters Atwo contacts before the switchthrough contact 122 is reached, Wiper 38 Jfour contacts, Wiper 42 siX contacts, Wiper 46 eight contacts, and50 ten contacts. YIta/vill be noted that the controlling ofthe vertical movement of thender is by the Wiper iregardless .of thel control equipment handling the call, and that the B Wipers control the rotary movement of the finder through the opposite half of the bank from that containing the con- .tacts Vof the calling line. The reason for this will be apparent when it is remembered that the line vequipment comprising Wipers 30 to 50, inclusive, is constantly moving .and does not change its pace or stop during .the setting of a call.

When a calling line is found, as the line was found by the Wipers 39 and 40, the control equipment for the entire line group is momentarily made individual to that line and any other calls in the line 'group Which may be Waiting Will be delayed until thelirst .call iscompleted and the inder establishes a .connection to it. When the finder establishes this .connection thedistributor l) is stepped o of the contacts'leading to that inder. The

- distributor then acts as .a selector .picking connection :with the selected' koit relay 6 to battery,

the controlling .equipments are simultaneous ly engaging the contacts of a calling line. ghe locking circuit :tor'the lline relays 2, f4,

7 on these relays themselves, that tchainbeing broken 4by the relay nearest -to relay 18, which terminates the chain, to cut oft' the other line relays. When line relays 7 and 11 Buey guarding i Thevvipers 30 to 5() of the line equipment.

9 vand 11 .extends through chain .contacts are simultaneously energizedby ,their respec-V areconstantly moving from the lett hand y:side

to the right hand side of the bank contacts pictured in Fig. 1, the equipment for doing this being shown in tion Serial No. 229,018, liledOctober 2, 1927. Unless special provisions 'Were made'to lprevent the interference of this equipment with the lines in the group Which arealreadyin use, subscribers talking over that line would hear a series of clicks each time the V positive and negative'line Wipers of the group 'encounterthe contacts of la line. To guard against this, 1, 3, l6 8 and the private Wipers P1, P2, P3, P4, and P5 which Wipers engage the private contacts of the lines in the bank. The private contacts in the bank are spaced a little in advance of the other contacts of the set. If a line has been taken for use in a finder. switch ground is placed on to the priva-te Wiper V52 by the spring 93 of the switch through relay 14 of the finder to extend a circuit through that my co-pending applicay l have provided cut-off relays 10, each associated with one of Y* Wiper and the private contact and release trunk engaged thereby, to the P contact in thel bank of the line equipment associated with that line. When the private IWiper of the line equipment having access to that line, encounters this -P contact thisy ground completes a circuit through the Wiper,`41 for ex ample, through contacts 72, through the cut- Y to .energize that relay which at springs 70 and 71V removes ground and battery from theline Wipers 39 and 40.

Since the private contact P is in advance .of

the line contacts relay 6 will be energized before the line wiper engages their contacts and there will be no click in the line when these Wipers engage since they are connected to nothing and do not bridge from one contactset to another. If the line 7 5 happens to be taken for use by the connector the private contacts CP in the bank of the connector will be grounded by that switch and circuit of the cut-off relay 6 will be closed as before. Thus it will be seen that lines already in use will not be interfered with in any way by the passing of the line equipment wipers over their contacts.

Line A initiates a call Assume now that the line A initiates a. call by removing the receiver from the switch hook to complete a circuit through the telephone to the line conductors leading to the line equipment. It will be noted that these line conductors terminate only in benl: contacts, those contacts being in the banks of the finder switches, the banks of the connector and the banks of the line equipment. When the line initiates a call nothing occurs immediately unless the wipers of the control equipment happen to be standing on the con` tacts of that line at the instant. Since each wiper has access to twenty contacts it will happen more often that the wipers will be elsewhere when the line initiates a call. When the wipers engage the contact set of the calling line, no circuit is closed through the private contact, since that Contact is as yet ungrounded. However, as soon as the line wipers engage the contacts of the line 75 a circuit may be traced from ground through springs 70, positive line L3 and the wiper 39, Contact 75 in the banlr accessible to the wiper 39 to the subscribers loop and telephone, the negative line contact in the banl, wiper l0 engaging that contact, the negative line L3 connected thereto, springs 71, through the upper winding of relay 7 to battery. Relay energizes over this circuit and at spring 73 breaks a point in the locking chain of the succeeding line relays and locks itself from battery through its lower winding, spring 73 and its malte contact, spring 68 and its break contact, spring 63v and its break Contact, through the winding of relay 18 through the breal: Contact of spring 100 to ground. Relay 18 energizes in this circuit and relay 7 is locked in its energized position.

The energization of relay 18 at springs 99 closes the obvious circuit through the win ding of 'relay 21 oi the distributor equipment D, to energize that relay for a purpose which will be hereinafter pointed out. At springs 98 relay 18 closes a circuit from ground through multiple paths, the one leading through the lower winding of relay 10 the lower winding of relay 8, and the winding of relay 5 in series t0 battery, to energize relays 5, 8 and 10. The other multipled path leads through the lower winding of relay 6, the lower winding of relay 3. and the lower winding of relay 1 to battery to energize relays 1, 3 and 6. It will be seen that responsive to the energization of relay 7, relays 18, 21, 1, 3, 5, 6, 8 and 10 have all been energized.

Relay 5 at the springs controlled by it opens the private wipers oit' the line equipment so that no further tests are madeby the distributor and line equipment during the setting of the present call. Relays 1, 3, 6, 8 and 10 are energized to remove the ground and battery connections from the positive and negative line wipers of the line equipment so that lines which may be in use will not be interfered with while the private wiper circuits are olisabled. Relay 7 being locked independently ot the springs 70 and 71 will not fallback at the moment.

The energization of relay 21 prepares a locking circuit for the relays 19, 20 and 22 by closing springs 106; and prepares a point in the circuit of the distributor motor magnet 24 by closing springs 105. At springs 104, relay 21, closes a circuit from ground through wiper 55, through the winding ot' relay 13 to battery. Relay 13 energizes over this circuit to open a point in the finder release circuit at springs 87 and to prepare points in the finder switch through circuits at springs 88 and 92.

Vertical impulsing rl`he inder switch F, having been preselected by the distributor' D in a manner which will be hereinafter pointed out, is now operated in a vertical direction a number of steps corresponding to the number of contacts engaged by the wiper 33 prior to its arrival at a cut-oli' contact. lVhen relay 18 energizes a circuit is closed from ground through springs 97 and the vertical impulse conductor V, wiper 33, contact a, which is in line with the line contacts from which the instant call is initiated, and therefore simultaneously engaged by the wipers, vertical interrupter conductor 142, and thence over parallel paths, the one through springs 110, through the winding of relay 23 to battery, and the other through spring 111, wiper 57, through the winding of the vertical magnet 16 to battery. Relay 23 energizes over this circuit, locking itself over a circuit traceable from ground through springs 96, springs 95, wiper 56, springs 112, through the winding of relay 23 to battery.

The vertical magnet 16 energizes over the above circuit, and is locked energized independently over the wiper 33, over the circuit just traced from the wiper 56 to springs 112, thence through springs 110 and 111, vthrough the previously traced path to the vertical magnet 16. When the vertical magnet 16 is fully energized the locking path of that magnet5andithefrel`ay`23 isbrokenand if thek wiper 33 has passed olfl to the-contact a thatrel'ay and magn'etwill fall back. When the magnet 1-6 energizes it advances the'shaft, not shown, carrying the wipers I5,1l to 53 one-vertical step, inwhich-position thejwipers are held by the well' known mechanical attachments on the switch.v As the line equipmentfand wiper 33 move forward contacts b, @,d, e, f, andV gare encountered in turn and sinimore impulses are sent over the circuit just traced kto the vertical magnet. rlhe magnet is. operated seventi'mes to elevate the wipers 51' to 53 seven steps in the vertical direction, inywhich position they -are standing' oppositethe seventh level of their banks.

" Oia/miga over Y Whenvthe wiper 33 encounters change-over contact 120 it closes aY circuit from `grounded spring 97, through the change-over conductor 143,through' the winding of rel-ay 22 to battery, energizing that lrelay which locks itself through the springs 106 and 108. The energization of relay22r opens the circuitY of the-vertical magnet 16 of the-finder at springs .1-11-,fandf closes a circuit from'A the rotary interrupter conductor 140 through-fthe winding of relay 23. At springs 109 relay 22 .closes a circuit from ground through spring 74 and the conductor-B3 to kthe -wiper 42 which is nowinengagement with contact 7i of the bank. This circuit 'extends through the'contact and the rotary interrupter conductor land thence over'parallelpaths, the one through conductor 140, through spring 103 and the winding of relay 20- to battery, thesecondthrough spring 110 'and the winding. of relay 23 to battery,y and the third throughl conductor 1'44,-wiper 58 and the ro'- tary magnet 17 to battery. Relay 20 upon energizing locks itself throughv springs 103 and 106 to ground, and' aty springs 102 prepares a point in the switch-through circuit, f' of the' finder.' Relay 23 energizesas before and at spring 112 locks itself yto'ground through the interruptersprings 95 and' 96 of the finder'F,jthisground` circuit also e-X- tending through springs 1121and1110 to the junction' of the conductors 140 and 144 to lock the' rotary'magnet circuit independently of the wiper 4.2 so that the rotary magnet is insured of fulloperation. -When the wiper 42 passes off ofl contact 8 relay23 falls back ifA the rotary magnet has' beenfullyenergized and the rotary magnetfalls back to complete its first step, whichstep has rotated the shaft, not? shown, carrying;l wipers 51` to 53,'inclusive, one step in' therotarydirection to bring the wipers into engagement lwith the first bank contacts in the seventhlevelof their banks. Impulsesl are transmittedin this manner to the rotary magnet and relay 23 whenwiper 42encountered contacts h", z'v,7','7c, and l, af total rof' five impulses delivered to lthe magnet tofbring the wipers of the switch to the fifth contact set in theseventh-level.

Swz'tc'" through" When wiper 42 encounters switch-throughl contact 127 a circuit is closed from ground through the previously traced circuit to the wiper 42, through the switch-through conductor 141, through spring 102'and thence 'over parallel paths one through springs-12085' At springs 100 relay 19opens a pointin` the circuit of relays 18 and 7 to permit thesesrelays to deenergize.; The cir-cuit of cut-off relays .1, 3, 5, 6, 8 and 10 is maintained closed through the make before break combination 100 so that the latter relays are not deen'ergized at thistime. Y The motor magnet 24 of the distributor switch Dis energized, but the wipers are not vadvanced since said switch is of the type of the wel-l known rotary line switch Whoscwipers are advanced when the magnet deenergizesA rather than when the magnet venergizes.- i The energ-izati'on of closes the' line circuit, through the wipers` 5,1 and 53 to the calling line by the operation of springs 90 and 94. At springV 93j relay 14 applies ground through the wiper 52 and the release-trunk Cnnductor associated with the line A to protect the line from intrusion eitherby al connectoror byv theV linee uip- .ment At spring 91- the release'` trunk ack from the selector, not shown, is extended throughv the relay 14so that when the release trunk is grounded by theselector the well known manner relay 1 4 isl'locked` energized to that groundedconductor` to rmaintain the finder in its switch through positionfaslon'g as the connection is wanted. At springy 89 relay 14 opens a point inthe release circuit of the finder. i L

The distributor prese'lect's an alle ytder The deenergization of relay 18- at springs v99 opens the point in thecircuit of slow-torelease relay 221, which falls backY after an interval and at springs y106 opens the locking circuit of relays 22,. 20 and 19. At springs 105 relay 21 opens thecircuit over which magnet 241of the distributor was energized to'permit that magnet to deenergize and advance the wipers of the distributor one step.y If the next finder of the group happens to lbe Vidle no further sten -inGfis-ne'cessar but if it is busy a circuitwill be completed from ground on springs 88, off-normal springs 86,

Vthe bank-contact engaged by wiper 54through relay 14 of the finder leo that wiper, springs 107 and the winding oi the motor magnet 24 to battery. The motor magnet is again energized and breaks its own circuit at springs 107, falling back to advance the wipers of the distributor another step. The circuit from ground on wiper 5a also extends through winding of relay 19 to maintain that relay energized so that the line equipment is not taken for use prior to the finding of an idle finder by the distributor. When an idle finder is encountered, wiper 54C loses ground and the motor magnet comes to rest deenergized. Relay 19 falls back and at vspring 100 closes a point in the circuit 01": relay 18, to permit that relay to be operated by another call in the line group. At spring 100 and its make Contact relay 19 opens the circuit through the lower windings of relay 1, 3, 5, 6, 8 and 10 to permit those relays to restore to again complete the testing circuits of the line equipment so that that equipment may look for additional calls in the line roup. n

While I have chosen to show my invention in connection with a particular type of apparatus, I have done so by way of example only, as there are many modiiications and adapta tions, which will be apparent to one skilled in the art, which can be made without departing from the spirit of the invention.

Having thus described my invention, what I consider new and desire to have protected by Letters Patent is pointed out in the appended claims.

What is claimed is:

1. In al telephone system, a plurality of subscribers lines terminating in bank contacts, the contacts of said banks being arranged in groups, a finder switch having access to said lines, a constantly moving line equipment also having access to said lines, means for associating said finder with said line equipment and means in said line equipment responsive to the initiation of a call by one of said lines for directively operating said iinder first to select the group containing the calling line and then to select the calling line from that group.

2. In a telephone system, a plurality of subscribers lines terminating only in bank contacts, a two coordinate finder switch having access to said lines, and means common to said lines responsive to the initiation of a call onY one of them for directing said finder through said two coordinate motions to establish a connection with said line.

3. In a telephone system, a plurality of subscribers lines terminating in bank contacts, the contacts of said banks being arranged in groups, a two-directional finder switch having access to said groups, said finder switch having a normal position, a unidirectional constantly moving line equip ment also having access to said lines, means for associating said finder with said line equipment, and means in said line equipment responsive to the initiation of a call by one of said lines for moving said finder out of its normal position through two directions into connection with said line.

l. In a telephone system, subscribers lines, a line equipment having a plurality of sets of wipers, a finder switch having a primary and a secondary motion, a primary test wiper in said line equipment, a secondary test wiper in each of said wiper sets, means responsive to the association of a set of said equipment wipers with a calling one of said lines for directing 'the primary movement of said finder switch under the control of said primary test wiper, and means controlled thru the secondary test wiper of the set associated with the calling line for directing the secondary motion of said inder to establish a connection with said line.

5. In a telephone system, subscribers lines, a line equipment having a plurality of sets of wipers, a finder switch having a primary and a secondary motion, a primary test Wiper in said line equipment, a secondary test wiper in each of said wiper sets, means responsive to the association of one set of said equipment wipers with a calling one of said lines for directing the primary movement of said finder switch under the control of said primary test wiper to operate the finder a number of steps in its primary movement dependent upon the position of the primary test wiper when said line was found calling by said set of equipment wipers, means con-y trolled through the secondary test wiper of the set associated with the calling line for directing the motion of the finder a number of steps in its secondary movement depending on the position of that test wiper when said line was found calling by the said set of equipment wipers, and means associated with said iinder for establishing a connection with said line.

6. In a telephone system, a plurality of subscribers lines designated by tens and units digits, a line equipment having a bank of contacts and wipers sweeping over said contacts, said lines being so arranged in said bank that said wipers simultaneously test the lines of odd units designationin retrogressive order of their tens designation then test the lines of even units designation in retrogressive order of their tens designation,

a finder switch having access to said lines, 1

means in said line equipment for testing said lines for calling condition, and means responsive to thev iinding of such a calling line for directing said finder to it to establish a connection with it.

7. In a telephone system, a plurality 'of subscribers lines designated by tens and units digits, a line equipment having a bank of contacts and wipers sweeping over said contacts, said lines being so arranged in said bank that said wipers simultaneously test the` lines of odd units designation in retrogressive order'of their'tens designation then test the' lines of even units designation in retrogressive and'lof their tens designation, a finder switch liavingi accessi to said lines, means in saidline equipmentfor testing said lines for'calling condition, and means responsive` to the'finding of two simultaneously' calling lines by said line equipment for directingzsaid finder to tlie'one of t'liosegline's having they lower' units designation'.

8. In a telephone system, aA group of' sub'- scribers lines'terminating in a iinder'switch bank and' in a line' equipment bank, a finder switch having' access to saidlines, a constantly moving'. line' equipment alsov having access to said linesprimary and' secondary magnets inpsaid' finder, primary and secondary control' wipers on said line equipment engaging auxiliary` contacts associated with said lines, linefwipersfon. said line equipment, means responsive to the picking up of an' initiated callby' saidk line'wipers for extending a circuit throughv said primary control-wiper and said primary magnet tooperatefthe magnet a' number of times dependent upon the posif ti'on of said line wipers when said calling line was encountered, means operatedl when said' wipers reach' a predetermined position for breaking said primary circuit and for establishing a circuit through sai-d secondary magnet-and wiper to operatethat wiper and magnet' a predetermined number of' steps dependent uponthe positiony of said line'wipers when said calling line was encountered, means' responsive' to thel operationof said magnet-ster positioning'said finder upon said calling: line, and means for establishing a connection therewith;v

9. In a telephone system, a pluralityfof subscriberslinesterminating in: finder bank contacts int which bank they are arranged in a-plurality of groups ina deinite order, contiolf' equipment banks divided into al lesser number of groups of contacts tofwhich said lines are also connected inv a different order, a linder switch having' wipers for registering with said finder cont`acts,.a control equipment having` a wiper set' for eac-h of s'aidf groups 'in' the control equipment bank, said wipers being moved' over' the contacts' of their respective groups at` a uniform speed, means responsive' to the initiation of' a call on one of. said linesV for seizing said line equipment for'tlie exclusive use of that call" when said wipersz encounter' the line, aiidnieans con` trolled thrusaidfline equipment wipers and dependent" upon thef set of wipers used and the position of that set when the-calling line is encountered for directing said finder to establish ai connection withthat line.

1'05- In a1 telephone system, a' plurality ot subscribers? lines, twoicoo'rdinate iinder switch having ban-kl contacts, a1 commonY line equip'- ment switch' having bank contacts, said lines coiinectedto'the iinder'bank contacts in a defi.- nite order and also connected to the bank contacts of the commony switch'in a different order, means for operating the common'.

switch tos'eize a calling one of said lines, and means in said common switch responsive to such seizure'for directing said iinder switch through its two-coordinate motions in accordf ance withv the' position of the bank contacts f of the said calling line in the common switch bank `to'establisli a connection with the bank contlnactsV of said calling' line in the finder ban ll. In a telephone system, a' line equip- -f of saidlines for thereafter'directing the 'primary and secondary'niovenients of the iind'er under control ofthe primary and' secondary test wipers, respectively, 'dependent upon the position of the bankcontacts of said calling line in said' line equipment.

lf2.` Inv aA telephone system, a plurality of subscribers lines divided into groups,l aecommoii line relay anda common' cut-olf relay for eachy group of lines, an autoniaticswitch common to said' lines and' having av set of wipers for each group, means for operating saidiswitch, means responsive to a set of said wipersv encounteringk a callingv line Jfor energizing the line: relay associated with the group-'iii which the calling'li-iie is located, and :C

means operated responsive'to the operation of said line relay for energizing all the said cut-ott relays to thereby seize saidv common switch for' the' exclusive use of the calling line.

1'3. In' a telephone system, a plurality of subscribers? lines divided into groups, an automaticswitch common tosaid lines and having. a set of-wipers for each group of lines, means for operating said common switch, means-operated' responsive to a set of said wipers encountering .a calling one of saidA lines .for seizing said common switch'tor the exclusive' useV of the calling line, a finder switch: controlled by the operation of said l' common switch to establish a connection with the calling li1ie,-and' means'foperated responsive to" the establishment of said connection for causing said common switch to revert ignations and consecutive tens designations,

such designations determined by the terminating position of said lines in the finder bank, a common line relay and a common cuto relay for each group of lines, means 'for associating the line and cut-olm relays of each group successively with lines in their corresponding groups of lines, means responsive to the association of a line relay with a calling one of said lines for directing said iinder to said line and causing it to establish a connection therewith, and means including said cut-oil;l relays for preventing 'further association of said relays with said lines during the operation of said'tinder switch.

15. In a telephone system, a'plurality ot subscribers lines, two motion directively controlled finder switches having access to said lines, an auxiliary switch for finding a line when calling, said auxiliary switch continuing to operate after connecting with the calling line, and means controlled by the continued operation of said auxiliary switch for directively operating one ot said inders in its two.movements to iind said calling line.

1`6. In a telephone system, a group of telephone lines connected only to the contacts of switch banks, two-motion directively controlled finder switches having access to certain of said contacts, control equipment for said finders, a constantly moving switch for associating said control equipment with certain other ot' said contacts, means responsive to the association of said equipment with the contacts of a calling one of said lines for f thereafter causing said constantly moving switch to generate impulses, and circuit connections over which the impulses generated by said constantly moving switch are delivered to one of said finders to directively operate it in its two movements to the contacts of said calling line.

17. In a telephone system, a group of telephone lines connected only to the contacts ot switch banks, two-motion directively controlled linder switches having access to certain of said contacts, control equipment common to said finders, and a switch for connecting said control equipment with the contacts of a calling one ot said lines, said switch then operating to directively control a finder in its two movements to the contacts of the calling line.

1S. In a telephone system, a plurality ot lines, a directively controlled two-motion automatic switch having access to said lines, a single motion auxiliary switch having access to said lines, said auxiliary switch operating to yconnect with one of said lines when calling, and means for causing both said switches to move together after the auxiliary switch connects with the calling line and until the automatic switch is directively operated in its two movements into connection with the calling line. y

19. In a telephone system, the combination of a plurality of subscribers lines ter'- minating in a switch bank and having tens and units designations in accordance with the position oi the bank contacts in which such lines terminate, cfa second switch bank in which said lines terminate in bank contact groups each of which comprises only the bank contacts of the lines having the same units designation, and means for successively testing the lines in a group.

20. In a telephone system, the combination of a plurality of subscribers lines terminating in a switch bank and having tens and unit-s designations in accordance with the A position of' the bank contacts in which such lines terminate, oit a vsecond switch bank in which said lines terminate in bank contact groups each of which comprises only the bank contacts o1"- the lines having the same units designati-on, and means tor simultaneously testing all the lines in said groups having odd units designations and the same tens designation.

21. In a telephone system, the combination ot a plurality of subscribers lines terminating in a switch bank and having tens and units designations in accordance with the position of the bank contacts in which such lines terminate, of a second switch bank in which said lines terminate in bank Contact groups each oit which comprises only the bank contacts of the lines having the same units designation, and means :for simultaneously testing all the lines in said groups having even units designations and the same tens designation.

22. In a telephone system, the combination of a vplurality ot subscribers lines terminating in a switch bank and having tens and units designations in accordance with the position of the bank contacts in which such lines terminate, ot a second switch bank in which said lines terminate in bank contact groups each of which comprises only the bank contacts of the lines having the same units designation, and means for consecutively testing the lines in a `group in the order of their tens designations.

23. In a telephone system, the combination or". a plurality of subscribers lines terminating in a switch bank and having tens and units designations in accordance with the po sition of the bank contacts in which such lines terminate, of a sec-ond switch bank in with a calling one of said lines, said linesV terminating in the bank of the finder switch in groups, each iinder line group consisting v bank of contacts and wipers sweepingpover said contacts, said lines also terminating in the bank of the line equipment in groups, each line equipment group consisting ofthe lines having the same unit-s designation but different tens designations arranged in a definite order, and means responsiveto the wipers of the line equipment encountering the bank contacts of a calling line for operating said finder switch in its two movements to the finder bank contacts of the calling line in accordance with the position of the bank contacts of the calling line in the line equipment bank.

'25. In an impulse sender for directively operating a two-motion switch in a primary and then a secondary movementl to complete a connection` a primary wiper, a plurality of secondary wipers, means for operating said wipers, means controlled by said primary wiper 'for determining the number of primary impulses to be transmitted to said switch, means for selecting one of said secondary wipers, and means dependent upon selected secondary wiper for determining the number of secondary impulses to be transmitted toV said switch.

26. In an impulse sender for directively operating a two-motion switch in a primary and then a secondary movement to complete a connection, a normally inactive primary wiper, a plurality of normally inactive secondary wipers, means for operating said wipers, means for rendering said primary wiper active, means dependent upon the position of said primary wiper at the time such wiper becomes active for` determining the number of primary impulses to be transmitted to said switch, means for thereafter rendering only one of said secondary wipers active, and means dependent upon the selected active secondary wiper and dependent upon the' position of the primary wiper at the time such wiper became active for determining the number of secondary impulses to be transmitted to said switch.

27. In an impulse sender for directively operating a two-motion switch in a primary and then a secondary movement tocomplete -a connection, a normally inactive primary wiper passing over a deinite number of primary bank contacts' in succession, a plurality of normally inactive secondary wipers each passing over a number of secondary bank contacts, means for rendering Said primary wiper active, means dependent upon the position of thev primary wiper at the time such wiper becomes active for determining the number of primary impulses to be transmitted to said switch, means responsive to the primary wiper engaging the last of said primary contacts for rendering only one of said secondary wipers active, and means dependent upon the selected active secondary wiper for determining the number of secondary impulses to be transmitted to said switch.

28. In an impulse sender for directively operating a two-motion switch, a normally inactive primary wiper passing over a definite number of primary bank contacts in succession, the last of said contacts being a changeover contact for controlling the changeover of said Switch from its primaryv to its secondary motion, a plurality of normally inactive secondary wipers each passing over a number of normally inactive secondary control contacts and a normally inactive switch through contact, means for rendering said primary wiper active, means dependent upon the position of the primary wiper at the-'time such wiper becomes active 'for determining the number of primary impulses'to be transmitted to said switch, means responsive to the primary wiper encountering said changeover contact for rendering said secondary contacts, said switchnthrough contacts, and only one of said secondary wipers active, and means dependent upon the selected active secondary wiper for determining the number of secondary impulses to be transmitted to said switch.

29. In an impulse sender, a switch bank having a definite number of primary contacts, a plurality of groups of active secondary contacts, a switch-through contact associated with each group of secondary contacts, multiple connections between said primary contacts, multiple connections between said active secondary contacts, and multiple connections between said switch-through contacts, each secondary group' comprising a different definite number of active secondary contacts, and wipers cooperating with said lcontacts to control the transmission of impulses by said sender.

In witness whereof, I hereunto subscribe my name this 20th day of November, A. D. 1928.

v RUDOLPH F. STEHLIK.

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