US1252974A - Telephone-exchange system. - Google Patents

Description

H. G. WEBSTERl TELEPHONE EXCHANGE SYSTEM.

l. ,I APPLICATION FILED MAY I6. 1914- 1,252,974. Patented Jan. 8,1913.

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TELEPHONE EXCHANGE SYSTEM.

APPLICATION min Mule. 1bn.

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H. G. WEBSER. TELEPHONE EXCHANGE SYSTEM.

PPLrcATIoN FILED MAv16.1s14'. V 1 ,252,974. Patented Jau. 8, 1918.

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wnNEssEs INVEN'roR H. G. WEBSTER.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION msu MAY16.19|4.

Patented Jan. 8,1918.

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W ITNESSES INVENTOR H. G. WEBSTER.

TELEPHONE EXCHANGE SYSTEM.

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15,252,974. Patented Jan. 8,1918.

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El El v [NVE NTOR H. a. WEBSTER.

'TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED nu 16.l 1914.

Patented Jan. 8, 1918.

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TELEPHONE EXCHANGE SYSTEM. rrucmon f|' Lzu nu 1s. 1914.

Patented Jan. 8,1918.

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' Patented Jan. 8,1918.`

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APPLICATION man MAY I6. |914.y

Patented Jan. 8,1918.

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INVENTOR H. G. WEBSTER. -TELEPJHUNE ExclHANGE SYSTEM.

APPLICATION FILED MAY I6. 19H. K

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Patented Jam, 8, 1918 H. G. WEBSTER.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED MAY I6 1914.

INVENTUR SUN WITNESSES H. G.`WEBSTER.

TELEPHDNE EXCHANGE SYSTEM. APPLICATION msu MAY 1s. 1914.

Patented Jan. 8,1918.

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Araucaria; ma may 1 6, 1914. gum No. 838,961.

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Be i'ltkynownthat 1Ha13nr G- vWEBSTIfifi, L 'zenfflh@ UnitedStates, residing at cago," ihn-the, county (ifI Cook, angl .State of 6 llmns", .have invented 'a new and n seful Ingp'royexncnt in V,Terlephcne-Egnz-hange Systems, 1Of i which" the following is a 'specificayv mferrition' relates to VMtelephone ex- 10 chgingeq L "cll pa rticu'larly `to that f direct yloatrnlln ,ifi machamsmsforhuildm- ,11,13 a

' dingto thelirgcof tels Y paucity ofvthesystem'.

@My invention also comprises certain vimtiren-pe. *n

Edvard e .a eac case' the secondary 'selection isac'orn .pli'shcd ybyu-'a1sr'rifnlilar relay `grmp associated Y with sel'lt `tion. serres to5 select an" 'inferrcda-tel which llas :been yconnected with n Ii,

an increase inthe `total line capacitypf sys- 'tems en) loyying a; 'serres 'of automatic swiktche'sf or completing conn'ection-bet'n'een Patented Jan- 8, 1.918-

a callingand'calledslibscriber. In'p'rior ydigit system, it'l'xas'bec possibleV to use only those call `numberscomprising fivehdgits each and beginning VJwith the numenlsfone to nine, inclusive. Call rnurnbersc(insisting of one', two,.three and f'ourdi its have not luis thereforejbeen lto ,this fextrenflimi'tetl: 1t 1s one lyfeatilreof the presentimention to provrlderneans forwutili'zinjg those'eall numbers having fewer digits .than the inlaximm n uhmber` of'digits'ernployedin the' 'system thus materially increasing theftotal' linecaproyenient with respect to circuit arra'nfe- In accordance with the .particular embodiments ofl'vrnyinvention here illustrated, theA line` of a' eaullingsubscriber is extended ,to-

` the Alteylsfet operator (who manipulates the.

ns. In one :embodiment thefprimaryf; Ifl lis. `performed bythe 4answering or vgator of a manualexehange sing` lays'arrangedgenerally in the manner e-Ik been heretofore utilized lin 1 "e-digt Sys`4 tem, an'd 'the line capacity offsnchsystems vrnent.{1I}@other ldtalls which, togelhgerjylth i the above; [will "'be'vrknore fpllylexplained in thefollowin g "description taken pm connec-4 f tion'Withfthejccornpanying drawings. $0`

y Vary answering cord` *nir-2 :In :1nf Y Vvo'itler' vcm1;poliment -also here escrlbedl the. primary selection 1s accomphsledfby; :y rem.v

E. Clement 'March '24, l1914-; jfl

aint mediate' trunk. Thefsecpdaryy "ics to select andronnect to an diete v"trunk Ia first' selector which has li'fmlben. s'sociatedwith the called 'subscrbel-jys" a f I tion; tertiarylselection is performed by a si'miilarfrelay roup.ivhclr'isdrectl rt-of tlfe primary selecting operascribed.' The first selector serves to pick a trunk leading to a distant exchange and terminating 1n a second selector, to be herey afterreferred to as an inter-office selector.

The inter-office selector serves to pick a local trunk termina-ting in a third selector, to be a l'ed; -group of keyset apparatus with which the 'cia ted.

hereinafter referred to as a local selector." The local selector serves to pick a l'trunk leading to a connector associated with the line group containing the called subscribers -.line; and the connector serves to pick the desired line and to automatically apply current to ring the bell at the sub-station,in case the desired line be idle. The first selector may also pick a local selector, seving as a second selector, located within the originating exchange.

Referring now to the drawings, Figure 1 illustrates an A operators apparatus, and line circuit arrangement which may be used in case the primary selection is performed by an A operator. Fig. 2 lillustrates the the first selector to which the calling line is 'connected by the A operator. Fig. 3

illustratesl the inter-oiice selector, Fig. 4'

the'local selector, and Fig. 5 the connector. Fig. 6 shows the arrangement of the tens and units relays for performing the secai ondary selection, and Fig. 7 thesecondar control apparatus for controlling andv guardS ing the secondary selecting operation. Fig.

- 8 illustrates a section of the intermediate trunk with which the grouped relays of Fig. 6 are associated, and also the apparatus ior -fpntrolling and guarding the tertiary select' ,inv operation. Fig.l 9 illustrates the grouped re ays associated with eaclr keysetfo'r accomplishing the tertiary selection, 4together with .switching apparatus for guarding a ainst delay 1n case a keyset becomes dis and.. Fig. 10 shows the complete group of-ter-tiary selecting relays is asso-l Figs. 1'1, 12 and 13, in connection with Figs.A 3 to 1Q, inclusive, illustrate that-modication of -my invention in which the primary sel'ection is performed-by relay groups rather than manually by anA operator. Fig. 11 shows a subscribers line circuit 'and the relay group for selecting a calling line. Fig. 12 shows the apparatus for controlling and guarding v'the prima'ry'selectingapparatus of Fig. 11, and Fig. 13 shows the first selector associated withkthe relay group of Fig. 11, andwhich is thereby connected with the calling line. Figs. 14 andl illustrate a modification of the tertiary selection and keyset apparatus, whereby calls originating and terminating within the same subexchange may be established using talking trunks entirely'local to such exchange. Fig. 16 is a diagram illustrating a method of arranging a plurality of keysets in related sub-groups for the use of a plurality of key set operators. Fig. 17 is a diagram illustrative of my invention vas embodied in an ex change system comprising five main exs changes and two sub-exchanges, wherein the keyset operators are all located at the central main exchange. Fig. 18 is a chart showing the proper manner of relating the drawings 1 to 1 0, inclusive, to illustrate the arrangement in which the primary selection is performed by A operators; and Fig. 19 is a similar chart showing the arrangement of the drawings for illustrating the modification in which the primary selection is automatically performed byrelay groups.

Referring first to the traveling switches indicated in the accompanying drawings, vthe selectors and connectors are of that type in which the switch Wipers 'are first` directivcly driven in a rotary direction until opposite the elected grou of contacts; and are then driven in a vertical direction with the wipers in engagement with the bank contacts. In the selectors, the vertical stepping isautomaticallycontrolled. to brin'o' the wipers to restx lwhen an idle set of bank contacts is reached while in the connectors, the vertical travel is directively controlled to select an elected set of bank contacts. In the selector switches there are eleven sets of bankcontacts in each vertical row, while in the connetors there are but ten sets, these constituting the terminals of called lines. The mechanical structure of a suitable switch for practising my invention is described in Patent No. 977,536, issued to C.

H. North'December 6, 1910, although my i`nvention is not limited to' this particular switch mechanism.

The' firstv selector switchv is indicated in Fig. 2 by the-Wipers Z152, D53, bfl, with their associated bank contacts','alnd the'r'o- 'tary driving magnet 11:20, the vertical magnet b21', and the release magnet L22. A rotary oiljnormal contact set is indicated at- 525; and 1s actuated at the first rotary step of the'switch and restored to normalatthe end of the rotary restoring motion 'of the j switch. Vertical off-normal contact isets, are" and restored at the end of the vertical re storing motion thereof. The inter-oilice selector is indicated in Fig. 3 of the drawings by the rotary driving magnet 1120, the vertical magnet 2221, the release magnet :11.22, the

"indicated at 550 and b51, these being actu ated at the first vertical step of` the Switch

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