US1216305A - Automatic telephone system. - Google Patents

Description

ULGOODRUM.

AUTOMATIC TELEPHONE SYSTEM.

APPLICATION FILED MAY 10, 1915.

Wl'iwesaes including in circuit Wyn m ime t tiff with. infield? GHAIELLJES L. GOUDRUM, til!" l 'llllliv Til? VJ'ESTEEN EIJEUTIEIQ To all witom it may Be it known that l, CHARLES Economic a citizen of the United residing st New York, in the county of New York nd. State of li ew lfi'n'lt invented ceitsnn. new and useful lrnpeo cnients in Autonoetic Telephone iiystenis of which the following; a full, elect, concise, emct descrip" Zion.

Elhis we ion relates to telephone one change systems employing inochine switch-- inn, and poi'ticulei'ly to systems oi em chain? consi .ing of o number of oilices'.

ln trunking hetween oiiices in such on changes it is the practice to i'eley or repeat the impulses for setting the selectors et the distant ofice from the incomiong, oilice to the distent office.

Due to the conductive separation of the trunk jlllCllll) at the repeater by condensers,

it ienecessery to provide means for i venting such condensers from chonginge the chcrecter of the impulses relayed to the dis tent oifice to set the selectors thereon which they would otherwise do in discharging Repeaters hove been employed wherein relays disconnect the condensers from the trunk While the impulses EH39, being tronsinittcd. After the ctoi's at the distant oilice hove been set, these relays con-- nect condensers to plete the talking circuit This invention provides a..- repeeter circuit wherein. .ie lays, on their eqitvolen s, necessary and co in inductively unitingthe incoming line flith the outgoing trunk by a low cepocity reheating coil, and

unit to con1- highly efficient use of such ierendered on with the repeater Windings on the incoming side it relay which. 18

adopted to be operated by the sender in accordance with the digits of the Wanted number to actuate e contact in circuit with the repeater windings in the trunk 0 outgoing side to produce impulses therein for setting the selectors at the distant oflice.

The invention will be more reedily understood when described by reference to the accompanying droning which illustrates only so much of telephone 15* stein es 1s tint-annotation of Letters li etcnt.

.ttnnlicntion litey M2,

- coil 9, conductor 25, right-bondwinding of itextented ltelo, co, int? wit. sem no. emote.

Wanted line. The first selector would then in the Wellflmovvn manner automatically plclz: out an idle one of these trunks. The operation of the sppcretus up to this point is Well. known and ther'efo e need not be described. It niey be of the type shown in U. Potentldlilfilll. i When the idle trunk is found, the relay '8 is energized by a circuit lending to the substation A as follows: free pole of the battery, leftlmnd winding of relay 6, conductor '2, Winding 8 oft-he repeating coil 9, conductor 10, contact 11 of the ifii'stxse lecton, brush ithereof, conductor 12; lo 'ush 2 of the finder, contact 13 thereof, line condoctor 14:, primary Winding lii of the induction coil rat substation A, contact 16 and switchliook 1T, transmitter 18 conductor 19, sender 5 linden contact 20, lincler brush 1, conductol." 2]., first selector brush 3, Contact 22, conductor 23, winding 24. of repeating relay 6, to ground. The relay 6 at its lefthand front contact closes o circuit for a slow relay 26, which opens the circuit of release magnet 27 at the first selector. Relay 6 at its i'ight hond armature and front contact closes the trunk circuit lending to the distant ol'lice as follows: free pole of the bot tery, lefthcnd Winding; of clay 28 of the connector at the distant office, conductors 29, 30, winding 31 of repeating coil 9, conductor 32, right-hand armature and front contact of relay 6, conductor 33, winding 34 oi repeating coil 9, conductors 35 end 36, right-hand Winding ofrelay 28 at the connectoi", of ground. The subscriber at sub station 2 now operates his dial. 5 in accordance with the tens digit of the number of: the Wantedline. Each time the circuit of relay 6, above traced, is interrupted by the sender 5, the relay 6 is decnergized and interrupts at its right-hand armature and front contact the circuit traced for relay 28 at the connector. The armature of this relay in vibrating operates the primary magnet of the connector, which magnet elevates the brushes 40, 19 to the level containing the terminals of the Wanted line in the Wellknown manner. At the end of this series of interruptions, when the sender completely restores and maintains the line relay 6 energized, the continued energization of the relay 28 at the connector will causethe changeover operation to take place at the connector to shift the circuit leading from the contact of the relay 28 from operative relation to the primary magnet of the connector and into operative relation with the secondary magnet thereof. The subscriber at substation A now operates his dial 5 in. accordance with the units digit of the num ber of the wanted line, whereupon the circuit of relay 6 is again intermittently interrupted, which in turn intermittently interrupts the circuit of relay 28 at the connector which transmits impulses to the secondary magnet thercat to step the connec or brushes &0, if) to the terminals of the wanted line, whereupon the line is tested and it idle, ringing current is sent thereover, or it busy, a busy signal is sent back to the calling subscri er. The apparatus for accomplishing these functions may be similar to that shown in the patent mentioned.

When the subscriber at substation B removes his receiver, in response to the ringing current, the following circuit is closed to supply him with talking current: free pole of the battery, left-hand winding of relay 37, conductors 38, 39, connector brush l0, terminal 41, conductor in, transmitter 4L3, switchhook 44-, conductor in, primary winding 46 (if the induction coil, conductor 47, terminal 18, connector brush 49, conductors 50, 51, right-hand winding of relay 37, conductor 52, to ground. The direct current which is supplied to the calling subscriber at substation B is prevented from flowing over the trunk conductors 30, by condensers 53, 54 at the connector.

\Vhen the calling subscriber at substation A restores his receiver, he interrupts at switchhooh 17 and contartlli oi the substation apparatus, the circuit of relay (3. This relay allows its armatures to fall back. The left-hand armature in falling back causes the dei ncrgization oi; the slow relay 26, which completes the circuit of release magnet 27 of the first selector over the following circuit: free pole of the IM- .;r v, release magnet 27 oi the selector, conductor 55, brush 56 of: the selector, test contact 5?. conductor 58, armature and back contact of slow relay E26, condutcor 59., left-hand armature and back contact of relay o to ground. The right-hand armature of the relay (3, in falling back, causes the (lei nergization oi relay 28 at the connector, which at its armature and back contact may close the con-- nector release circuit to restore the CONJUNP tor. The apparatus now restored and ready to be used in establishiiur another connectio ii.

What is claimed is:

1. In a tele il'mno QXClifll'lfIO system, the combination with a pair of line oondiurtors, a. connecting circuit in. sections, a repeating: coil uniting said sections iiuiuctively. and means for connecting said line cm with said connecting circuit, oi relay, a metallic circuit including! conductors, said relay and the remain; windings in the incoming); section of saii'l connecting circuit, said relay havii'u a M l:- tact included in the outgoing section c said C(illlitiCtlllg circuit, mean l'or op um." ing said relay in accordance with the di, of the called number, and automatic sw oi (s adapted to be set by the impu... s so p 'o- (luced.

'2. In a telephone exchange system, combination with a pair of line moduciw, a connecting circuit in sections a icpvaiui coil uniting said rvoctions in(luvl,iv l r, means for connecting said lno wii'iduci: with said conucrlin circu Y, of stoppio j, relay, a metallic circuit including: so conductors, said relay and the repeate wii'idiugs in the incoming section of said connecting circuit, said relay lwvins: a club tact coutrollii'ig the continuity oi too uillfi inn? section. ol said conncclii o circuil, a sender adapted to inieri'iuit said nurial ic circuit and thus operate said relay, and automatic switches adapted to be set oy the impulses so produced. I

3. in a telephone exchange system, the combination with a talli'iuecircuit divided into sections, a repeating coil uniliugi said sections inductively, of a relay bridggcd across the n'iiddlc point ol? one side of said repeating coil and having a contact coin trolling the continuity of the other section, means for operating;- said relay in accordance with thediggits of the called number, and automatic switches adaptor: to ho sol by the imliiulses'so produced.

4. In a telephone exchange ,--.,'u -m. the conibinaiioi'i with a pair of line conductors. a connecting" circuit in sections. means l'or inductively uniting said scclious inrludiw 3;"

feed coils and a source of current, of a step:-

ping i'eizim 2E, metallic circuit including; smici line sonductors, said relay and. the feed coil windings in the incoming section of saidi connecting circuit, said relay having ii c0iitact ineiuded in the outgoing section of said connecting circuit, means foir operating said relay accordance with t e digits 0f the caiied number, and ziiiwmaiic SWiilflhi-ES adapted to be set by ehe impiiims so pi-uducted.

In Witness whereof iieiimiiiiu siibsc 'iiae my name this 8th day or" li iaxy, W15.

CIHLRLES L. G-UUDRUM.

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