US1053864A - Automatic telephone-exchange system. - Google Patents

Description

. J. PETLCKY. AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

` APPLICATION IILED JUNE 24, 1909.l

'Patented Feb.18,1913.

14 SHEETS-SHEET 1.

J. PETICKY.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED 111111124, 1909.

1,053,864. Patented Feb. 18, 1913.

14 SHBETS-BHBET Z.

J. PBTICKY.

AUTOMATIC TELEPHONE EX HANGE SYSTEM.

FILED JUNE24, 1909.

APPLIGATIO1 Patented Feb. 18, 1913.

14 SHEETS-SHEET 3.

J. PETICKY. AUTOMATIC TELEPHONE EXCHANGE SYSTEM,

APPLICATION FILED JUNE 24, 1909.

Patented Feb. 18, 1913.

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U uuu J. PETICKX.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JUNE 24, 1909.

Patented Feb. 18, 1913.

14 SHEETS-SHEET 5.

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J. PETICKY.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JUNE 24, 1909.

Patented Feb.18,1913

14 SHEETS-SHEET 6A J. PETICKY.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLIOTIOI FILED JUNE 24, 1909.

Patented Feb. 18, 1913.

14 SHEETS-SHEET 7.

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J. PETICKY.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JUNE 24, 1909. 1,053,864, Patented Feb. 18, 1913.

14 SHEETS-SHEET 8.

J. PBTICKY.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JUNE 24,1909.

Patented Feb. 18, 1913.

14 SHEETS-SHEET 9.

J. PBTICKY. AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

14 SHEETS-SHEET 10.

Patented Feb. 18, 1913.

APPLICATION FILED JUNE 24, 1909.

J. PETICKY.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JUNE24,1909.

1,053,864. Patented Feb. 18, 1913.

J. PETICKY.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM, APPLloA'rIoN FILED JUNE 24, 1909.

1 ,053,864, Patented Feb. 18, 1913.

14 SHEETS-SHEET 12.

WAK 62M J. PETICKY.

AUTOMATIC TELEPHONE EXCHANGE SYSTEM. APPLICATION FILED JNI; 24, 1909.

.1,053,864 Patented Feb. 18,1913.

14 SHEETS-`BBEBT 13.

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J. PETIGKY. AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JUNE 24, 1909.

1,053,864. Patented Feb. 18,1913.

waz JMJ? gram shown in Fig. 43.

sTATEs PATENT oEEicE.

Jossl'" rErI'cxY, or xNIeLIcHE wmNBEnoE, NEAR PRAGUE, AUSTRIA-HUNGARY.

AUTOMATIC v'LEIJ'SIEHONEfEXCHANGE SYSTEM.

To all whom, it may concern.'

Be' it known'that I, Josnr Perreux', a subjectof vthe .Em eror.. of :Austria-Hungary, and resident of {nigliche lVeinberge, near Prague, Austria-Hungary, have invented certain new `4and useful Improvements in Automatic ATelephone-Exchange Systems, of which the following isV a specification.

This` invention relates t0 automatic telephon'e exchanges and its principal object is to improve an simplify the same.

Inrthe drawings: Figure 1 shows a view from the back of the subscribers call apparatus certain parts to this apparatus he- I ing broken away so as to increase the cleariiess of the figure. Fig. 2 shows a side elevation of Fig. 1. Fig. 3 is a front elevation view of the entire apparatus. Figs. 4 to 16 show details of the subsoribei"s call apparatus. Fig. 17 is a side elevationof t ie exchange apparatus. Fig. 18 is the corresponding top plan view. Figs. 19. to 23 show detailv views of this apparatus. Fig. 24 shows a side elevation view of one of the intermediary switch apparatus. Fig. 25 is a top plan view of the same, the upper electroinagnet being removed. Figs. 26 to 33 show details appertaining thereto. Fig. 34 is a top plan view of the coniiecting-up aJparatus, while Figs. 35 to 42 showdetai s of the same. Fig. 43 shows a scheme for connecting up the various contacts and electroinagnets of the automatic telephonesystem. Fig. 43* shows an extension of circuit dia- Figs. 44 and 44 together show the repartition ofv groups.

In the present form of embodiment of this invention the subscribers call ap aratus, the exchange apparatus, the intermediate switch apparatus, and the connecting-up' apparatus, are constructed in the` followinf7 manner: 'lhe s ubscribers call apparatus Figs. 1 to 16) comprises thev stationarycircular disk 301 (Fgsgl, 2, 4, 7) on whichare arranged two groups 351,253, vof contactswliich are insulated from=eaeh other. 'The first group 351, comprises eleven, the second group, 353, ten contacts 5 the two grou sof eontactsare connected w.ith each other y means of electric conductors. l Arran ed along the groups of contacts and' behind te'idisk-Ol, is a commonl contact bar-350' (Fig. 4).- -The electric connection between the contacts 351 and 353 I Specification of Letters'latent.

- Application led .Tune 24, 1909. Serial No. 504,178.

Patented Feb. 18, 1913.

respectively,` and the contact bar 350, is effected by four pairs of sliding contacts 352 (Figs. 1, 4-7), which are arranged on bent levers 302, 303, 304, 305, (Figs. 1, 5, 6, 9, 10), which are rotated in the direction of the arrow II (Fig. 1) by a clock work 308, (Fig. 2) through the medium of the arms 306 and the common shaft 307. Each of the said bent levers 302 to 305, as well as the sliding contacts thereof, 352, are supplied with a helicoidal spring 309 on the circumference of the disk 301. Mounted on the arm 306, and positioned toward the center of the apparatus is a spring 310 which is provided with a tooth 310 (Figs. 9 and 10), and allows at a given moment the desired bent lever 302-305, to keep its retracted position. The radial arms of the bent levers which are provided with the pin 311, are of different ength and have such dimensions that each of the pins 11 during the rotation of the arms 306 reaches one of the four rows of holes 312, 313, 314, 315, provided in the plate 250. These holes are intended to receive the Contact pegs or plugs 316, 317. 318, 319 (Figs. 1-3; 6-8). They are designated by the numerals 0 to 9 on the outsic e of the late (Figs. 3 to 8), the holes 312 beinU ma eto correspond to the thousands, the holes 313 to the hundreds, the holes 314 to the tens and the holes 315 to the units of the number to be called so that the said late allows of any number being compose between 0 and 9999. Each of said Contact plugs or pegs 316 to 319` is intended to eoperate with one row of holes, the pegs 310 being intended for the row 312, the pegs 317 for the row 313, and so on. The four contact. pegs are suspended from the apparatus by means of cords (Fig. 3), and their free ends project into the ap aratus (Fig. 2) when they have been introdiiced into the desired holes. Thev form in this manner abutments for the pins 311.

If during the rotation of the shaft 307 in the direction of the arrow II, the pin 311 for instance of the longest lever 302, strikes against the pegs 316 which is intended to coperate t-herewith, the bent levei' 302 controlled hy said pin 311 is shifted in the direction ofthc arrow II, and the slide contacts 352 are removed from the circumference of the disk. By this movement, the

slidiiigrcontacts 352 which are arranged on the lower, artfof the bent leverr302 are raised,f`} a'n 'slide -"along tlie''incline of the tooth 310', conse uently pushing aside this tooth, aswell vas (tll riesit'. '"Iflifespriny 310 is t usfteiisioiiedand as soon-as .thesli ingcontacts- 352 havearrived at the-upper surface of the tooth 310', the As ring310 suddenly-@returns into its initia position, as vthefup er surface of the tooth- 310" slides under t e 'surface 'of t-he sliding contacts 352. It results, therefrom, that the'sliding contacts -are held-in their raised position and continue theirmotion -in this position.

As shown by Fig. 1, a metal sheet 320 is secured to the framework ofthe apparatus on the left hand side of the. disk 301, and this metal sheet is provided with an incline, that is to say, that the metal sheet 320 is bent so as'to form an incline, the lower part of which is directed toward the framework of the apparatus. As soon as the upper part of the spring 310 arrives at this metal plate and on theupper surface of the latter, the spring 310 slides along the aforesaid incline of the metal plate 320 (Fig. 10, the direction indicated by the arrow IV), and is thus held under tension until the tooth 310 leaves the plane of the sliding contacts 352, thus allov ing the latter to'return suddenly into their starting position or position of rest under the action of the spring 309, and the spring 310 leaves then the incline of the metal sheet 320 (that is to, say the lower part thereof according to Fig. 1), and returns into its starting position. The upper peg 316 raises the arm 302, and the peg 317 the arm 303, that is to say that the sliding contacts 352 of the levers 302, 303, slidel on the contacts 351 until they are raised -by the pews 316 to 319 inserted intoa determined olle ofthe rows 312, 313, 314, 315. If the eg 316 .has been introduced for instance into` the first hole designated by 0,*the sliding-contacts 352 pass over the first contact of the group 353, and are then raised before they have time to come into contact with the following contact 353;-they continue afterward their motion in this raised position. If on the contrar the .peg 316 has been inserted in the fift i hole ofthe row 312, the contacts 352 (Figs. .1, 0, 8) slideonly on the five first contactsj353, are therefore raised, and continue their Ymotion in this raised osition. The same'operation lisv repeated with the bent levers 303 and=304,' and the egs 317 and'318. VThev bent lever 305' (FigLl ,works na similar inanner, and the sole difference existing ink its construction consists in that this'lever isdirectedin the opposite directinto the other'bent lever,'so that its slidingy contacts 352 slide exclusively on the contacts 351"(Fig. 7 ).--v' It is easily seen that the hole which has received one of the pegs corie spring 310, which car-v responds to a contact closed iu a suitable manner.

. The starting of the subscribers call is carA ried out by means of a starting lever 125 (Figs. 1, 2, 3) which is connected through Vthe medium of a transmission gear with a clock motion 308, and carries a bent arm 126 (Fig. 2). Mounted on the shaft of said lever 125 is a bent lever 127 (Figs. 1, 2), the shorter arm of which carries at its lower end an abutting tenon 128, one of ,the sides of 'which has ieen fiat, by means of a file and against which the arni 126 strikes when the lever 125 is lowered (Fig. 3). Positioned between the arm 126 and the longer arm of lever 127 is the tenon 12S) of a bai' 130 which oscillates on a. pivot and the opposite end of which is bent at right angles and applies itself against the abutment 131 of an arm 132 which is rigidly connected with the shaft 307, and consequently with the arm 306. )Vlien the lever 125 is pushed downward in the direction of the arrow V (Figs. 1 and 3), its arni 126 strikes against the tenon 128 and causes the shorter arm of lever 127 to move downward until its extension strikes against the stationary pin 133, secured to the framework of the apparatus. At the same time, the longer arm of the lever 127, and the tenon 129, have caused the bar 130, to oscillate in t-lie direction indicated by the arrow VI so as to set free the abutment 131. Thereafter the apparatus provided at thetelephone apparatus of the subscriber is adapted to move under the infiuence of the lclock work 308, and as a vmatter of fact, begins to move. The rod 125 is then set free and returns into its start-ing position shown by Fig. 3. Then the arms 306 have nearly accomplished an entire revolution, an abutment 134 secured to one of the arms 306 strikes against a stop device., the complete description of which will bc given'later on, and which is shown by Figs. 2, 11, and 12. When the retarding effect of this stopping device has been removed, the apparatus continues moving on a short distance until it arrives again in its starting or zero position. Once the arm 126 strikes again against the tenon 129, it carries it with it in -its motion as well as the arm of the lever 127, and the bar 130 so that the lat-ter arrives again in the path of motion of the abutment 131, and finally stops the arm 132 after an entire revolution has been accomplished. The above mentioned stopping device (Figs. 1, 11, and 12), is intended to give the parts of the apparat-iis the position which they niust have so that the conversation might take place between the subscribers. It comprises a stirriLp 135 (Fig. 12) provided on the inner surface of the front covering plate and adapted to move around the pivot 136, this stirrup carrying a pin 137 and projecting hook 138, and being controlled by a tractional spring 251. )Vhen the. saidfrnembersoccupy their osition of rest,` tliefhoolci138 is-iiidicatedv y a hook 139, which is connected'witli the lever 140 of the telephone receiver and carries vbeyond its point ;"of'- oscillation I 252 anl abutment 141. The arm 142 keye'd on the shaft-307r carries an abuttingpinl43.

In thev position of zero, orposition of rest, all .the members described above occupy the position shown by'. Fi0'.:1'.- As soon as the member re reseiiting the number of the subscriber-to called has been composed, and after the apparatus annexed to the telephone apparatusfof the subscriber has nearly accom lished, as explained above, a complete revo utioii, the abutment 134 strikes against the pin 137y (Fig. 11), thus causing the momentaneous stopping of the apparatus. In this position,4 the telephonie conversation can take place.

If at this moment the subscriber who calls upon another one removes the telephone receiver 253 from the hook 140, the atteris caused by the springs controllinfr it. to rise and thus cause the iiooks 139 and 138 (Fig. 11) `to engage each other. When at the end .of the conversation, the telephone receiver is again put on its hook, its weight causes the lever 140 to be lowered again and causes the stirrup 135 to move again in the direction indicated by the arrow VH, SFig. 12). The pins 134, 137, are consequent-y removed from each other and the apparatus is again sct free and can contiiiue its radial motion. The pin 143 strikes then against the abutment 141, thus doing away with the mutual engagement between the hooks 138, 139, and producing the liberation of .the stirrup 135, so that all the membersof the apparatus can return into their position of rest, shown by Fig. 1.

Thesliaft 307, togetherw-ith the arms 306, 142, 132, therefore continues still a little.its motion until tho tcnon 131, as already stated, rikes against the end of the balance beam 130. -1

80,81, 82, 83, are spring contacts providedin the apparatus annexed to thetele- )hone apparatus of the subscriberl (Fig.I 1).

he contacts 81, 82, 83,"are insulated from eachother, and secured to lthe plate of the apparatus; The contacta 80,1181, 82, are formed'by three,or rather four, springs,

' the spring cont-act 82 being `closed in the-position of rest, while the contacts 80 and 81 are open.-Tliese.spring contacts are formedA by a-.central'sprin 80' (Fig. 13), which is providedon'its'le t side'with'two pins254, 255, opposite which arel two springs carrying eac apinl- Arranged on the riglitside of the spring 8(7)"in a in 256'opposite which is thecontactisprinfv 57 which in turn, carriesajpin'.x-\s readily seen ythese'pinsiI form mal position are open and the contact 82 which under normal conditions is closed.

Secured to one of thc arms 300 is a certain number of extensions 144, 145, which are bent in a suitable manner, and the object of which is to close or to open at a given moment the spring contacts 81, 82, 83. A moment before the apparatus iii the course of its rotary motion stops in the position in which the conversation can take-place, the extension 144 touches the sprinffs of the contact 81 and closes this contact for a moment (Fig '14). A moment later, the said contact isvagain open and the apparatus stops, (Fie. 11).

hen the apparatus after the conclusion of the conversation, has begun its motion, the second extension 145 touches the springs of the contact 80, closes the latter during a moment (Fig. 15), and opens it again an instant later.

During the continuation of the motion of the ap aratus, the third extension finally enters into action, closing with its curved surfaces in a suitable manner the contacts 80 and 8l (Fig. 16), and opening at the same time the contact 82, these contacts being again set free a moment later. The apparatus finally stops definitely.

The contacts 83 (Fig. 1) are formed by two contact springs which when occupying their position of rest, are applied against one another by an extension 147 (Fig. 1) which is secured to the arin 306 and are thiis closed.

As soon as the apparatus begins to leave this position of rest, the extension 147 leaves the s ring 83 which under the influence of its elliisticitv, produces the opening of the contact, and this opening is maintained iintil the apparatus after having nearly entirelv accomplished its revolution, arrives in tie position in which the conversation takes place. At this moment, the extension 147 again engages the s ring 83 and thus produces the closing of t ie contacts. \Vhen the conversation is concluded, the a iparatus as it has been described above, au with it the extension 147, still perform a short movement until they have attained again their position of zero in which the spring contact 83 remains always closed.

Tlieexchange apparatus (Figs. 17 to 23) is constructed as follows: Arranged on the stationary sector shaped plate 148 (Figs. 17 to 19) are thiee rows of contacts 354, 356, 358, which are insulated from each other, and on which slide three contact springs 355, 357, 359, which are also insulated from each other. These springs are secured to a tooth segment 150 which is adapted to move around the vertical shaft 149 and to be actuated by the pawl 151 (Figs. 18|to 21) engaging the tooth of the segment to this end, the pawl 151 is mount- .iu-f'rotary'- andyieldingmanner on. av lever 152. (Fig.f21)'arra`nged'under the tooth segmentrl() (Fig.'-1 7), and; carrying the armature' 258.*of'th'e' electro-magnet 321, so that the'pawl'lt'ilzateach;ener izing ofthe electro-magnet 321,.' causes -t e: tooth segment 150'as Vwellaat iesliding contacts 355, 357,

its, object` to1ock. the v segment: 150 when the pawlall slidesbackward after. itsvadvancing fo'rthe segment.' The amplitude of motionoftheylever 152 and. that of thesegment 150 .is limited bv abutments which are arranged in a'suitable manner. The return motion of the` lever.152 after it has effected the-actuation of the segment, and the return mot-ion4 of the latter after the conclusion of the telephonie conversation, are. produced by tractional springs 154 and 155f (Fig. 18).

The advancing motion of the segment 150 (Fig.,18)does not take place during the conversation, but before the latter can be carried'on, as before the conversation can take place it is necessary to cause the apparatus to move and with it the segment 150. It is only after this motion has been performed that the conversationv can take place, asthe lever 1'52 mounted in a rotary manner on shaft 149 is attracted by the electro-magnet 321 wherefrom it followsthat the pawl 151 performs an actuating stroke (in .the direction of the arrow VIII Fig. 18), and causes the segment 150 to move. As readily seen, this segment 150 moves in the same direction. as the pawl151.

At each to andv fro` motion of the lever 152 carryingthe pawl,.an abutment 156 mounted4 e-n vthisl'ever (Figs. 18, 21) .closes and opens' thespring contact 85 provided on the stationary plate 148. As soon-as the toothed segment. 150 with its sliding contacts 55, 57, 50, has arrived at the last contacta 54, 56, 58, arraugedon the right aide of Fig. 18,.it closes through the instrumentality ofan abutment 157 carried by it, a springcontact 88 mountedon the plate 148. Whenthe toothed segmentlzreturns into itsstartingposition,the Contact 88 is again opened.

Mounted on. the framework of the apparatus are alsotwo contacts 86 and`87 (Figs. 17, 18, 22), the contact-87 of which is closed and the contactf86 open-whenthe-members c-f the apparatus occupy their.' position of rest or.-positionzofzero,.that is to say, when the;l toothed: segment 15G-occupies its position at the utmost Aleft.A (Fig. '18).` Infact, above'thesecontacts a'ho'ok 158 (Fgj22) is providedfwhich isadapted 'to oscillate again a-suitablepivotandcarres an extension 159 on which .thelever -160xof tho-.armature 25S) (I Tig:.`18)`-of'V tliezlectro-magnet 2337 is adapted toi uct'. Ou. the, side of the contacts 86, 87, is a lever 161 which is connected with the armature 260 of the electro-magnet 328. It results from this arrangement that when .the electro-magnet 328 is excited, the contact springs 86, 87, are pressed against `each other by the lever 161 acting in the direction of the arrow IX (Fig. 18)- on the other hand, as soon as the `circuit of the electro-magnet 328 is interrupted, the contact v87 is stopped by the hook 158 which .produces the opening of the contact 87 and -the closing of the contact 86. `When the electro-magnet 337 is energized, the contacts 86, 87, again assume their position of rest lowing to the raising of the hook 158. Prolvided on the armature 259 of the electromugnet 337 is a lever 163 adapted to move around the pivot 162 and arranged opposite the pawls 151 and 153, the object of said lever being to produce the return mot-ion of the toothed segment 150 in its position of rest.

As soon as the electro-magnet 337 is energized, the lever 163 disengages the pawls 151, 153, from the teeth ofthe toothed seg ment 150, thus allowing t-he latter to follow the action of the spring 155 and to return vinto-its position of rest. At the same time` as it has already been stated above, the con- . tacts 86, 87, and 88, are brought back into their respective positions of rest.

The excitation of the electro-magnet 337 is produced by the excitation of the electromagnet 336 (Figs. 17, 16, 23) and to this end the armature 261 carries one of the springs of the contact 8S), the opposite spring being mounted on the framework of the apparatus. Arranged opposite the spring cited in the first instance, is a hook 164 which is adapted to be actuated bythe arm 165 secured to the toothed segment'lt). When the members of the apparat-us occupy their position of rest, the contact 89 is open, while in case of excitation of the electromagnet 886, this contact is closed and is maintained in ita closed position by t-he hook 164. However, as soon as the segment 150 has returned into its position of rest, or position of zero, the arm 165 causes the hook 164 to oscillate whereby the open ing of the contact 89 is produced.

The construction of the two intermediate switches (Figs. 24 to 33) is absolutely identical and it is for this reason that only one of them has been shown and described. However, in order that it might be possible during the explanation of the function of the entire system to refer to both the intermediate switehes, the reference numerals of certain members (that is to say of the electro-magnet and the contacts) of the second intermediary switches have been put between parentheses, while the other constitutive members of the intermediate switches (segments, levers, and so on) have onlybeen designated once in the usual mannerinFigs.24vto Each -zofxthe .two intermediary switches (Fig`s424 to 33),- comprises a certain number, which may vary according to the requirements of. contact- rows 860, 362, 364, 366, 368, 370, on which slide sliding contacts :101,363, aca, 367, 369,' 371, (Figs. 24 und ee). By requirements the following is to be understood: 1n the tele hone exchange it is necessary to makeuse o a certain number of identical apparatus (exchange apparatus, intermediate vswitch apparatus, connectingup apparatus) in lorder to allow the subscribers .which are connected with these apparatus to select a second, third, and so ou, (ordinarily ten per cent. of the number of the subscribers) apparatus in the case where one of the apparatus selected by the subscriber was occupied at .his moment. This number is ordinarily ten per cent.; it may, however, be higher (fifteen er cent., ctc.) which varies according to tie intensity of working of the telephone system.

The sliding contacts are arranged in such a manner that they first advance ste by step in the direction of the arrow a: (Figs. 2l to 26), and it is in such a manner that at each step three v rows of contacts can be touched at a time, as this has been indicated in Fig. 25 by the braces. During the firstmot-ion in the direction of the arrow X contacts 360, 362, 364are not touched, but the sliding contacts move at the side of the contact rows.

Only during the second movement in the direction of the arrow XI (horizontal movement) Fig. 25, the three contacts 361, 363,

365, (367, 369, 371) slide at a time along three contact rows, each of the sliding contacts slidin on one row.

During t. e first movement of the contacts 361, 365, (867, 369, 371) in the direction shown bythe arrow X, these contacts are placed on the side of the three lower rows. By performing their horizontal motion, the contacts-frictionally engage the three lower contact rows. and advance one contact at each step. llfhen the sliding contacts have made two steps in the direction indicated by the arrow X, and afterward perform the horizontalmotion XI, they frictionally engage the second of the rows of three contacts and so on during their advancing motion, as it hasbeen said of the one contact at each step. In order to allow these two movements in the directions indicated by the arrows X and-IX, the sliding contacts are movable around a horizontal shaft and around a vertical. one. The framework 166 intended to carry the stationary contacts 360, 362, 364,'(366,j368, 370), has received a] corresponding shape and-is curved when viewed from-the"side (Fig. 24) according to-the circle'which the sli ing contacts describe by moving;v around the horizontal shaft 167. Viewe from the top, (Fig. 25) the said framework is also curved according to the circle which the sliding contacts describe when performing their horizontal movement -in the direction of the arrow XI around the vertical shaft 168.

' The sliding contacts 361, 863, 365, (367, 369, 371) are secured to a second toothed segment 169 (Figs. 24, 26), which is adapted to oscillate around the shaft 167. The teeth of this segment are engaged by a pawl 170 adapted to oscillate on the lever 171 and controlled by a spring. The lever 171 is also adapted to move around the shaft 167 and is actuated by an electro-magnet 222, 224, so that the toothed segment and the sliding contacts actuated by the pawl 17 are advanced step by step in the direction indicated by the arrow X. A pawl 172 (Figs. 24, 27) has for its object to stop the segment 169 each time the pawl 170 moves backward. The lever 171 (Figs. 24, 26) moves between two stationary abutments 262 and the return motion after each advancing motion of the pawl is produced by a spring 173. The return motion of the toothed segment 169 after the raising of the pawls 170, 172, is effected by a spring 174.

The shaft. 167 is mounted in a framework 175 bent twice at right angles (Figs. 24, 25, 27, and 28) and which is secured on a second toothed horizontal segment 176. The latter is adapted to oscillate on the vertical shaft 168 and is advanced step by step by a pawl 177 (Fig. 28) which is adapted to oscillate on the lever 178 and is controlled by a spring. This lever is also adapted to move around the shaft 168 and to receive an oscillatory motion by an electro-magnet 323 (325) so that throu h the medium of the awl 177 the itoot ied segment 176, the

ramework 175 and the sldin contacts, are advanced step by ste in the irection indicated by the arrow Xl, the sliding contacts during these motions engaging those of the contact rows opposite which they have been brought previously by the first advancing movement in an are to a circle in the direction of the arrow X. The pawl 179 at every receding motion of the pawl 177 serves to sto the segment 176. The amplitude of oscillation' of the lever is here, too, limited in a suitable manner and its receding movement after every working is effected by the spring 180. The ret-urn motion of the segment 176 and that of the segment 169 which is mounted thereon is produced after the raising of the pawls 177, 179, by the traction of a sprin 181. This intermediary switch comprises, esides, a certain number of contaets and electro-magnets, 90 (98) a contact (Figs. 25, 29, 30) which is closed when the members of the apparatus occupy their posiv tio'nlof .rra-ii'ged'belowfthis contactis v by,:anfelectro'm'agnetg'329 (331), -while `in frontof the"eXt-remessurface'of the contact .-energized, the rfs'prings263,264I of the conand produces by its motion the closing of the Contact (98).

The two contacts 93, 94 (101, 102) are each formed by two spring blades constructed in such a manner that in the position of rest, the contact. 94 is closed, while the contact 93 is open, (Fig. 31). Below the sprin lr a lever is arranged, the left end of which forms the armature of the electro-magnet- 330 (332). As readily seen, when this electro-magnet is energized, the right end of the lever which carries a screw, Fig. 31, oscillates upward and pushes the springs equally upward. As an insulating block 267 is inserted between the springs 265, 266,v this block, when the spring 265 moves, presses against the lower spring 266 and raises -it until it applies itself against the upper spring of the contact 93. During this movement of the springs, the spring 265 places itself above the upper surface of the tooth 186. Under the action of this s ring, the bent-lever 187 oscillates toward t e sprin s thus allowing its tooth 186 to place itse f under the spring 265 and to stop the latter. Assoon' as the current circulating in the winding ofthe velectrmagnet 330 (332) is interrupted, the armature lever-185 oscillates downward and -the'i-s ring 94 which before had been tensioned, ollows this motion-'of the lever. .Th'e'contact'94 is thus opened.v The contact '93 on the' contrary remains still open. This state of things lasts until the lever187 is actuated, that is to say untilthe` electro-magnet 339 is energized. The armature of this'electromagnet is provided with an 'extension 268 carryin a screw 269 (Fig.,24) which faces towardt e-lower end'ofthe lever *187; vWhenl the electroma et-339 isenergized, the""screw strikes against'tlielever 1,87 and''fthuscauses the bent 'lever'v 18"(l to move.' The spring 265 is thus free and'returns into its prior position, that; islto say, into its-positionof rest in which the contact 94 is closed and the contact 93 open. The levers 184 and 187 are juxtaposed on the same shaft of oscillation. They move at the same time when the electro-magnet 339 is energized.

.;.-`.T.he cont-act 91 is secured to the plate of the. framework and is positioned at the right hand behind the toothed segment, Fig. 24. Jt is composed in turn of two springs forming together a contact.

Y' To the toothed segment. 169 an extension 188 is secured in suoli a manner that it bears in its position of rest against the right hand spring and holds this spring removed from the lefthand spring (Fig. 25). )Vhen the toothed segment 169 begins its movement. the extension 188 leaves the right hand spring which under the action of its elasticity presses against the left hand spring. The contact is closed from this moment.

When the segment 169 arrives again in itsl starting position, the extension 188 again bears against the righthan'l spring of the contactI 91 and thus determines the opening of this contact.

On the side of the framework 175 the contact 92 (100) Figs. 25, 27, 28, is arranged which in its position of rest and (hiring tht` whole. movement of the segment 169 is closed; however, as soon as the horizontal rotary movement begins in the direction indicated by the arrow XI, the extension 189 (Fig. 27) of the framework 175 moves back from the springs of the contact 92 (100). The latter 1s consequently open. If, on the contrary, the segment arrives again in its position of rest, the aforesaid contact is again closed.

.Arranged on the side of the lever 178 is the contact 97 (105), Fig. 28, which is se cured to the framework and is open when the members of the ap )aratus occ-u )y their posiA tion of rest, and during the advancing motion of the vertical segment. As soon as the lever 178 begins moving in order to cause the horizontal segment 169 to advance, the contactl which has just been mentioned is alternatively opened and closed.

At the side and behind the horizontal segment 176 (Fig. 28), the contact 95 (103), Figs. 25, 27, is arranged which is open in the position of rest. As socn as the segment 176 performing its horizontal motion arrives with'the sliding contacts 361, 363, 365, (367. 369, 371) at the lastV contacts 360', 362', 364', (366', 368', 370'), the Contact 95 (103) is closed through the intermediary of an ex tension 190 (Figs. 27 and '28) secured to the segment 176 and remains closed as long as the segment 176 dces not Abegin its receding motion.

The apparatus just described also comprises a disengaging device., which after thc conclusion of the conversation, brings the segments 176, 169, the contacts 90 (98), 93,

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