US959462A - Call-distributing switch. - Google Patents

Description

MEETS-41mm 1.

E'RISTENSBN.

0000000000000 OQ@ 000000000000000 o V.: G l CALLMSTEIBUTIN@ SWITCH. AZPLIOATIGNNFILED JUH; 23, 1906.

MEETS-SHEET 2.

.gammadi .May 3l, 3.91).

P. V. CHBS'I".EI\TSEN;V CALI DISTRIBUTING? SWITCH. PPLIOATIOH HLED. JUNE 2s, 190e.

PETER VALDEMAR CHRSTENSEN, OF COPENH-.GEL ENMARK, ASIG'NOR TO AKTIE- BOLAGET L. M. ERICSSON t CO., GF STOCKHOLM, SEDEN.

UNITED smrns Para CALL-DISTRIBUTING SWITCH.

Specification of Letters atent.

Patent-militair 3i, i910.

Application filed .Tune 23, 1906. ySerial No. 323,l00. l

To all whom it 'may concern.'

t by the present invention,

Be it known that I, PEiER-,VALDnMAR' In the heretofore usual telephone arrangements the subscribers lines are, at the change, divided into groups, each one consisting of a number of lines, corresponding to the average etiioieney of a. single operator. It appears hoWevei',-even it, with due regard to the empirical number of calls from the subscribers concerned, by means of the .so-called intermediate distributingtields, the lilies of the various groups are so distributed, that each operator might be expected to get,

a uniform share of the work,-that, in the .:ourse of time, matters Will be altered, so

that the individual operators will, again be unevenly oeeupied, and besides it may happen, that one ot the positions is crowded with work, during certain hours ot the day, while other positions are (.-oniparatively short ot' work. This state ol thiiigscauses delays and uncertainty in the telephone service, as wel] as overirfu'liiugr ot' the operators at they unduly busy positions.V These bad conditionsl may ol:l r-ourse be remedied by planning;r the exehangie so that the number olE lilies belonging( to earh group is made small enough to enable the opeiators, at any time, even at the busiest positions, to perform the exchange service with ease, but this arrangement necessarilv means a heavy first oost and a numerous operatingr stati". An attenil'it has been made to remedy the beforementioned draw-bach. by terniiiuitingil the subscribers lines at a peculiarly constructed distriluition board :t'roin where they are, 'when a call is made. su'itelud onto any inult'ijile board operator happening\,tov be idle at the given moment; this method however causes too great a delay in the operating. ,TliisldraW-back is completely removed the improvement being attained in such a manner that when the subscribers call, automatically opera tor happening to be The ma the line to be bel engi ne; ing` lines,

matie switxhing ing; a contact belonging toone of line Wires, starting' the motion of connections are made and instantaneously with the idle at the moment. in4 feature of the invention is that connected with an idle line certain group of distributas a main line., to an anto device, the latter, by elosthe main a group to a is run oicontact springs, until one of these, sliding along' a. contact row, reaches a, coiitaet corresponding to an idle distributing line whereby a cited ai id neeessa ry Qn the.

sri-called search magnet is ein consequently closes the contacts, for the desired connection.

accompanying drawings, Figure l is a longitudinal verticalsection oiilthe switching tribution. same.

7, and 8 Figs. 3, (1mb, e-f, and f--e respectively.

device used for the automatic dis- Fig'. 2 is a bottoni-view of the 4- and 5 are moss-sections Figs. 6, are wiring diagramsshowing, by

way of example, how the circuits may be arranged.

in the subscribers lines a. are of one hundred, group shown on subsei'iboi"s l arrangenient shown in Fig. 6 the divided into-'groups there being; but a single the drawing', and on each ine provided an automatic switch 15 adapted to connect the subseriberls line with common .t

run to th any oi' the distributingv linesA c o all the automatic switches in the These distributing` lines are e stations of a certain number'ot operators, for instance one to each ot tit teen, or three lines to each oi tive dili'erent stations.

dra Wing.

For' the salie ol elearness, only shown on tho At. each station (Z terminates a certain number ot' distributing lines, thirty itor instan d i tte re n t Y.illu h the ce, starting,r 'from as many or fewer groups et automatic switches. numbers chosen, by Yay of ex*- aniple, one operator serves two hundred "subseribers.y but each o Berater niaVr l) i' means oi" the distriluiting lines e, be connected with au;r one ot three thousand .subseribers The du upon the his line with one K .lines terminating atthe stat'ioiiot' an idle operator,

ties oli the autouiatie` switch are, call o't a subscriber, to conne-et of the idle dlstribntingand there to indicate the call, be-

to he blocked, until. thefoperator, after the clearing-ott' signal, opens the connection.

Fig. 7 shows another arrangement of the circuit Where again the subscribers lines are divided into groups of one hundred. Qn the drawing is shown but a single group. For cach of the latter is provided a certain number, fifteen for instance, of distributing lines c, terminating at a Certain number of positions (Z, for instance one for any one of fifteen. (En the drawing are shown only eight distributing lines c, each one of which terminates at an operating station ol. ln each distributing line o is inserted an automatic switch o', adapted to nialre connection between the said line and an)v one of the hundred subscribers lines o in toe group. ln addition there is provided a main automatic switch. e, arranged to he actuated by a suhscriocfs call to select an idle automatic switch which it then sets into action, in such a manner that the latter (o) makes connec tion `oetween its corresponding distributing line Hand the calling subscribeus line n. lie sides the two wiring diagrams shown by way oit example, various other Wiring niente niay he used for the automatic tribution. rl-he action ot' the automatic switching device illustrated in Figs. l-- of thc drawing will he understood from the following.

Referring to the drawings, l is a cylinder wherein a piston 2 may be moved by .nieans oi compressed air admitted into the cylinder, through a tube 3 and a Valve 4, the valve stein 5 passing looselji7 through the wall of the valve housing and resting against the armature 7 ,of an electro-magnet (S. By means of a spring 8 the armature of the electroonaguet (l is, when the line is idle, kept, in its lower position, so that the inlet from the compressed air pipe to the oyh inder is closed, While the latter is in open connection with the atmosphere; when now the electroinagnet tl, which in the following description is Called the controlling magnet, attracts its armature 7, the 'valve Ll will open, giving access for the compressed air and sluxlting oil the open air inlet. The piston 2 will then move toward the right.

To. the piston is xed a hollow piston rod Sl, carrying at its extreme end, toward the right, an electro-magnet '10, hereinafter called the search-magnet. During the niotion ot' the piston, the magnet l0 is guided by the pins l2 sliding in the guides ll. when the controlling magnet (3 drops its armature 7, and consequently the Valve'l enters its lowerposition, the piston 2 with the piston rod J and the search magnet. 1G are drawn back hy means of a steel hand lil, attached to the circumference oir' the 'hollow 10 pressed against the end -pulley le, containing a spiral spring, the

outer end of which is fastened to the pulley .4, While its inner end is fastened to the middle part of the lined axle of the puliev. A contact spring l5 is fastened to the searchvroagnen or to other parts moving with the piston 2; this spring has electrical connection with one end of the coil of the magnet 10 and during the movement of the piston slides along contact row 1'?, containing' one Contact more than the nuniher of distrib ating lines c to oe connected with the automatic switch. The other end of the coil of the Search magnet l() is connected 'with the cent-ral battery 32, through the armature and working contact of the suosciihcrs linerelay 3l (Fig. S), Each contact i'n the contact row connected, hy means of clistributing line c., to an operating stat-ion al,

and also thron'h tno switch 33, there provided, connected to the ground 34, so that the Contact at is made, as long as cor responding position and distributing line is free,`while it is open, as long as the station or the line is lousy. The one end of the coil of the controlling magnet (l is eonnected with the ground 34, While its other end, as the armature of the subscribers line-relay 3l is attracted, becomes conn-r other terminal of the battery, s call causes forward motion toward the ight of the `piston 2 and the Search magnet l0, Well as ot the contact spring l5.

During the movement to the right, the pins 18 (Figs. l, 2, connected by ineens ot a link system to the search magnet l0, ollowthe rectilinear rails 19 in the guides ll, but when the Contact spring l5 touches a contee' l? that has connection with an idle distributing line c, and thereby with an idle o eratingg station, as well as with the groune, then the search magnet lt) will reeeive current front the battery by the Way of 3l, l0, l5, l?, c, 33, 3ft-g it will new attract its armature QQ, and consequently lift the pins i8, so that, the latter are deviated into the corresponding branclior' sidetrack 2l, pointing upward in a slanting direction. This movement is continued, until the pins 1 8 have reached. the bottoni or' this individual Side track; during the last part of the increment the pine "i8 and the armature 2G are raised still more, and all the parts are held in this position, even if the Contact spring may perhaps have lea the cont-act 17. As the controlling inagnet 6 remains excited, the air pressure remainsl acti e and keeps the searcli..1nagnet of the Sidetrack. @n a plate 22, astened to the armature 20 are tilted three contact springs ).l,the latter igeing, oy flexible wire, connected to the line wires B5 Fig. 8) and to the suoscribers test wire 3o. vWhen the armature of the search magnet, l0 is attracted, and the pins eil to the' that a contact, a motor, a member moved by the motor3 a Contact carried by the member and trawelng over 'the series of select-ing Contacts, a Search magnet in circuit With the Contact carried by the member, a pluralby of contacts carried by he member and adapted to engage the series of Speaking and sgnnliug Coutucs, but norma'ily suppoxed S0 1S to not engage the series of contacts during 'the moven'lent of said member, and n, lacking means operated by 'the Search 11mg;- ne and adapted to stop the travel of H19,

moved membef against the force of the Cx'ving motor and i0 ransfer che force of motor so as i0 move and press he plurality of movable concts against cont-acts of th sffres of speaking and signaling contacts.

ln testmny whereof have signed my name i0 hs Specification 1u the presence of two subscribing Witnesses.

VVnesses:

' JULIUS LEHMANN,

HERMAN RE.

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