Historical Document · 1906
US 815,321 Automatic Telephone Selector Switch
The two-motion selector switch patent.
Historical Document · 1906
The two-motion selector switch patent.
No; 815,321. PATENTED MAR. 13, 1906. A; E. KEITH &YJ. & C. J. ERICKSON.‘ AUTOMATIC TELEPHONE SELECTOR SWITCH. APPLICATION FILED MAYZ, 1905. 8 SHEETS—SHEET 1. I I No. 815,321. PATENTED _MAR. 13, 1906. ‘ A. E. KEITH & J. & C. J. ERICKSON. AUTOMATIC TELEPHONE SELECTOR SWITCH. APPLICATION FILED MAYZ, 1905. 8 SHEETSr-SHEET 2. i8 / [/0 k a II 57 I! £55 r, l 1 W" t A $6 . A IH f - .ii ' Inn ‘.5 HI I H No. 815,321. ' _ _ PATENTED'MAR. 13, 1906. A. E. KEITH E J. & c. J. ERIOKSON. AUTOMATIC TELEPHONE SELECTOR SWITCH. APPLICATION FILED KAYZ, 1905J I 8 SHEETS~BHEET 3‘ in - . , ‘e . QM‘ ' . ' 7270229 ’ $64 8. M @W iazvzqw.’ . No. 8151321.- ‘ ‘ y Y‘ PATENTEDMARJB, 1906. A. B. KEITH & J. & C. J. ERIGKSON‘. ‘ AUTOMATIC TELEPHONE SELECTOR SWITCH. APPLICATION FILED MAYZ. 1905. 8 SHEBTS—SHBBT 4. QM. Y No. 815,321_. - ’ PATENTED MAR. 13, 1906. A. E. KEITH & J. & G. J. ERIGKSON. AUTOMATIC TELEPHONE SELECTOR SWITCH. APPLICATION FILED MAYZ, 1905. 8 SHEETSTSHEET 5. No. 815,321. ‘ EATENTED MAR. 13, 1906. A. B. KEITH & J. & 0. J. ERIGKSON. AUTOMATIC TELEPHONE SELECTOR SWITCH. APPLICATION FILED MAYZ, 1905. 8 SHEETS—SHEET 6‘ I No.‘ 815,321. _ . __ PATENTED MARY13, 1906. A. E. KEITH & J; & c. J. ERIOKSON. ‘ AUTOMATIC TELEPHONE SELECTOR SWITCH. APPLICATION FILED MAYZ, 1905. 8 SHEETS-SHEET 7. No. 815,321. - ' , PATBNTED MAR. 1a,v 1906.‘ A. E. KEITH & J. & 0. JQERIOKSON. - AUTOMATIC TELEPHONE SELECTOR SWITCH. APPLICATION FILED MAY 2, 1905. '8 SHEETS-SHEET s. W, nxnikt,i UNITED STATES. PATENT OFFICE. ALEXANDER E. KEITH, JOHN ERICKSON, AND CHARLES J. ERICKSON, OF CHICAGO, ILLINOIS, ASSIGNORS TO AUTOMATIC ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATIONYOF ILLINOIS. ’ AUTOMATIC TELEPHONE SELECTOR-SWITCH. Speci?cation of Letters Patent. i No. 815,321. Patented March 13,1906. ' Application 1110a May 2, i905. Serial No. 258,509. rotatable ‘and endwise-movable switch-shaft, Be it known that W8,ALEXANDER E.KEITI~I, together with switch arms or wipers mounted JoHN ERIoKsoN, and CHARLES J. ERICKSON, upon said shaft and adapted to engage the .55 citizens of the United States of America, and usual semicircular banks of contacts. To all whom it may concern. residents of Chicago, Cook county, Illinois, The machine or switch as a whole involves have invented a certain new and useful Im suitable electromagnetically-actuated mech anism for steppin the shaft vertically to any provement-in Automatic Telephone Selector Switches, of which the following is a speci?ca desired level-of t e bank-contacts, it being 60 tion. understood that these contacts. are arran ed ~ Our invention relates to the automatic in rows one above theother; The step-by step or ratchet mechanism with which the step-by-step switching apparatus or machin ery employed in automatic telephone-ex changes. switch is provided can also be. employed for rotating the shaft in a step-by-step manner 65 It relates more particularly to that type of at any desired level; but, as will hereinafter automatic switch or switching machine com more full ‘appear, this rotary step-by'~step ~ monly known as a “selector” —that is to say, ‘motion 0 the shaft is, when the switch is a switch employed for automatically select used as a selector, automatic in character and ' ing and making connection with an idle is not under the control of the calling sub- 70 20 trunk-line leading to another selector or to a scriber. In such case, however, the-calling “connector,” as the case may be. In some instances these selectors are known as “?rst mechanism to the extent necessary to enable selectors” and are so designated when they are employed to receive the electrical im ulse or impulses representing the ?rst digit 0 any 25 subscriber’s number. Again, these selectors subscriber has control of the stepLby-step him to cause the said shaft to move or step up to any desired level, according to the charac 75 ter of the ?rst digit ofrthe called number; but as explained and after the calling subscriber are known as “second selectors” and when so has caused the selector to bring its shaft referred to are employed for receiving the wipers up to the desired level—that is to say, electrical impulse or impulses representing up to the desired row of contacts——the switch ' the second digit of any subscriber’s number. then continues its operation automatically Should the exchange be of considerable size and without the direct control of the sub say one in which the subscribers’ numbers scriber for the purpose of automatically se range as high as five di 'ts-some of these “se lecting an idle trunk-line leading to another lector-switches” wou d be known as “third selector or to a connector or to some other 85 selectors,” inasmuch as they receive the elec— device, according to the size and character of 35 trical impulse or impulses representing the the exchange. Obviously the electromag third digit of any subscriber’s number. It is netically-actuated switch or mechanism of evident that the mechanism of our improved the machine must include means for insuring selector-switch is applicable to either ?rst,' the desired mode of operation of the switch—— 90 second, or third selectors or fourth or ?fth se as, for example, when employed by a calling lectors, according to the size of the exchange. subscriber in automatically selecting an idle As will hereinafter more fully appear, certain trunk-line leadin to the desired group of sec features of our improved automatic switch ond selectors, third selectors, or connectors, ing device are also applicable to switches of as the case may be; but it will also be seen 95 the same general type, but which are for cer that 1provision must be made whereby the 45 tain well-known reasons referred to as “con nectors”——that is to say, switches which re switc can be operated to the desired posi- 1 tion and made to remain in such condition s ond to the electrical impulses representing during conversation between two subscrib t 1e last two digits of anyisubscriber’s num ers, but then released by some act on the part ber and which make the ?nal connection di of one of the subscribers after the conversa rectly with the called-subscriber’s line. tion is terminated. Again, when used as a selector the switch must in addition to its be seen that the essential feature consists of a function of making connection with an idle As a selector or even as a connector it will 2 815,321 trunk~line perform the further office of estab improvement are ap licable to the so-called lishing such a guarding potential at all other “connectors,” as wel as to a selector such as terminals connected with such line as will pre clude seizure thereof by some other sub herein shown and described. To the foregoing and other useful ends, scriber, and, furthermore, and if employed as however, our invention consists in matters 70 a ?rst selector, provision must be made for hereinafter set forth and claimed. creating such a guarding potential at all ter In the accompanying drawings, Figures 1, minals at the calling-subscriber’s line as will 2, and 3 are respectively a left-hand side eleva preclude a cutting in on this line by other tion, a front elevation, and a right-hand cle 10 subscribers while the-same is in use. In other vation of an automatic step-by-step switch 75 words, regardless of whether the switch is to ing-machine embodying the principles of our be employed as a ?rst, second’, third, or other invention, the said switch in this instancebe selector, means are desirably provided for en ing what is commonly known as a “selector.” abling the switches to protect the lines in use Fig. 4 is an enlarged side elevation of a por against seizure by other subscribers when tion of the mechanism shown in Fig. 3. Fig. such lines are in use and in each case to rotect 5 is a horizontal section on line 5 5 in Fig. 4. the line leading from it and with whic it has Fig. 6 is a detail of a portion of the mechanmade connection against seizure b other sub ism shown in Fig. 5, showing the rotary pawl scribers. These and other desira le features in engagement with the rotary ratchet-teeth. 20 or requirements will hereinafter more fully‘ Figs. 7, 8, 9, 10, and 11 are each a detail of 85 appear. the ratchet or escapement mechanism of the Generally stated, the object of our inven tion is the provision of an improved, simpli so-called “side switch” and illustrate differ ent conditions or positions of the same. Figs. 12, 13, 14, and 15 are each a detail of the end of fied, and highly~efhcient switching-machine 25 of the foregoing 0'eneral character. the interrupter-arm and of the switch-springs Certain speciaf objects are to provide, in operated thereby and show different condi combination with the other elements, the im tions or positions of the same. Fig. 16 is a de proved cast frame for mounting the opera tail side elevation of a portion of the vertical tive parts of the switchinglmechanism ; to pro step—by-step mechanism and shows the releas vide, in combination with the other elements, ing devices and the rigidly-connected locking 95 improved flat adjustable springs forretaining dogs. Fig. 17 is a front view of the devices the so-called “vertical” and “rotary” arma shown in Fig. 16. Fig. 18 is a view'of the tures of the so-called “vertical” and “ro other side of the devices shown in Fig. 16. tary” magnets in their normal positions; to Fig. 19 is a view of a portion of the mechan 35 provide, in combination with the other ele ism shown in Fig. 17, but showing the same I00 ments. an improved flat spring and a novel in a different position. Figs. 20 and 21 are arrangement for fastening the same in lace each a perspective of the link employed for for pressing the rigidly-connected loc ing connecting the armature of the “release-mag dogs against the so-called “vertical” and net” with the two rigidly-connected locking “rotary” ratchet-teeth carried by the rotary dogs and show the said link in different posi 105 switch-shaft ; to provide, in combination with tions relatively to the small projection on the the other elements, an improved arrangement double locking-dog which it is adapted to en involving a screw having a lock-nut and gage. Fig. 22 is a detail plan of the so-called which passes through ‘a lug in the frame and “normal—post switch” and the clock-spring 45 acts as a guide for ‘the “rotary pawl”——-that device for returning the shaft to its normal is, the pawl carried by the armature of the position. Fig. 23 is a detail vertical sectlon rotary magnet and which actuates the rotary on line 23 23 in Fig. 22. Fig. 24 1s a back ratchet-teeth carried by the shaft; to provide, view of the jack~springs whic 1 are attached in combination with the other elements, an to the switch structure and which are adapt improved stop for the said pawl of the so ed to engage the stationary jack-springs se I15 called “rotary magnet,” to provide,.in com cured to the rack or other support upon bination with the other elements, improved which the switches are mounted. Fig. 25 is a means for separating the banks of contacts section on line 25 25 in Fig. 24. Fig. 26 is a and for holding the same in place and for in perspective of one of said jack-sprmgs._ Flg. 55 suring easy and effective adjustment thereof. 27 is a perspective of one of the stationary It is also an object, of course, to provide j ackespr1ngs——that is, one of the jack-springs certain details and features of construction, secured to the rack or support on wlnch the improved combinations, and matters of im switches are mounted. Fig. 28 is a side view provement tending to increase the general of the jack-spring shown in Fig: 27, showing efficiency and serviceability of an automatic its support in section. Fig. 29 1s a face vlew I25 step-by-step telephone-switching machine or of the structure shown in Fig. 28. Fig. 30 1s mechanism of this particular character. a detail view showing the manner in whlch a ‘As previously stated and as will herein jack~spring on the rack or support receives after more fully appear, many of the objects one of the jack-springs on the structure of the 65 of our invention and many of the features of switch. Fig. 31 is a detail plan of the so 815,321 ‘called “side switeh,” Showing certain parts connected with his line and anather trunk in ‘ horizontal section. Fig. 31"‘ is‘ a’ etail line, according‘ as the switch'is as a ?rst, ‘ view of the to Fig. clock-spring 31, but device. showing Fig. 32 is side second, or third selector‘. ' ,More‘ strictly Speaking, the Switch fer inspecting a sub switch insecend position. Fig. 33 shows the scriber’s line with any one ofja number of 70 side switch‘ in thir’drOSitiQn- Fig- 34 is a trunk-lines. or for connecting a trunk-line bottom ‘plain: bf the S146. switch as Shawn in‘ with any one of another group of trunk-lines Fig 31, showing portion ofthe support-_ corn" rises the upper and lower banks O'and D in -frame. Fig.‘ 35 1s a side view of the of “ inc-contacts,” together with the switch— IO s1 e-switch armsor wipers'and the stationary arms or shaft-‘wipers c and d,'the latter bein 75 contacts for the same: Fig. 36 is a detail mounted upon said‘ shaft. As illustrate , view showing the key or device to which the these two banks of contacts are semicircular lower end of the “side-switch sprin ”’ is se inform, each comprising ?ve superimposed V cured and by which the tension of t e latter semicircular rows of "‘line-terrninals,” which is regulated. Fig. '37 is a perspective of the are suitably insulated from each other and 80. said side switch,‘showing the “side-switch each of which ‘consists of'a pair of contacts wipers” and contacts removed. Fig. 38 is a connected with Opposite Side-S 0f ‘a metallic detail. View of the vertical, step-by-step mech trunk-line. These line-terminals c’ and d’ anism, showing‘ adjacent parts in section. are of the charactershown-‘more clearly in, 20 39 is a view similar to Fig. 38, but show Fig. 44, each terminal,"as stated, consisting 85 ing the parts in a different position. Fig. 40 of two contacts suitably insulated from each is a front view of the vertical ste -by-step other‘ and provided at their rear or outer mechanism‘and adjacent parts. F1 . 41 is a ends with terminals suitable ‘for making sol side view of the vertical ratchet-teet , show der or other wire connections, and in each 25 ing the vertical groove or channel in same. case these contacts have their forward ends Fig. 42 is a'hori‘zontal section on line 42 42 in held in position to be engaged by one of the Fi . 41. Fi . 43 is a detail section of the cir two pairs of "‘line-wipers” mounted on the cu ar teeth sown in Fig. 41, showing the sup said shaft. (See Figs. 44, 49,’ and 50.)" ‘The porting - dog in enga ement with the said “line-shaft wipers” c and d are, as illustrated, teeth. Fig. 44 is a p an view of‘one of the mounted in pairs, the pair (3 being allotted to 95 line-contact hanks, showing the switch-shaft the line-bank vC and the pair id to the line and the bankksupporting rods in horizontal bank D.’ The two line-‘banks thus provided eeeeien and One .ef the Shaft-Wipers was not really constitute one bank divided into two Inal position. Fig. 45 is a vertical section sections, inasmuch as the constructionillus 35 thrbugh the Sig-called “Private-bank con tact.” 46 1s a perspective of one of the end Pieces of the bank shown in Fig- 44- Fig 47 is a detail sectional view of the “private trated involves ‘ one line-terminals I00 arranged’ in ten .s'lipérimppséd isemicii'éular rows of ten terminals‘ each. Consequently, and’in‘ order 'to obtain compactness and shilft wiper.” Fi . 48 is a similar view of avoid cross-talk and secure ‘other’ advan one of the line-shat wipers. Fig. 49 is a ver tages, the line-terminals connected with the r05 ticel s?etien on 111.1? 49 49in Fig- 44- Fig- 5.0 is one hundred trunk-lines leading from the an, 9nd View of’one of the “ ‘lineébanks.” Fig. switch are dividedinto' two rou'psv and each 5.1 is a Perspective of 0.11.6 of the rings or collars grou I constitutin , as'state ,[a bank; but in ‘ for supporting’and separating the contact the ank D the eve superimposed rows of 45. banks. Fig’. 52 is'adetail section of one of the ' trunk-line terminals represent the ?rst, hank- supporting rods, showing the applica-v third, ?fth, seventh, and ninth levels of the tion of the collar shown in Fig. 51. 53 switch, while the terminals of the bank vC rep is a view Similar to Fig. 52 and illustrates the resent the second, fourth, sixth, eighth, and method of ap lying or adjusting the said ring tenth levels, or the “zero-level," as the up- ' into place. ig. 54 illustrates one method of permost or last level is sometimes called, of wiring 9r conneetin' ‘ the ma nets and‘ relays. the switching‘ apparatus ‘as a whole. In other and switches, &c. ,' sown int 1e preceding ?lg words, the ‘two pairs of shaft-wi ers c and d IIO > ur'es and shows the principal parts of the mec - are adapted to operate in ten distinct levels anism,’ 111 perspective’ or horizontal planes, the relative arrange- ' I ' As illustrated, the switch is ada ted 55 ment of the said wipers and rows oi termi I20 for use as a selectorwe'ither ?rst, secon , or rials being such ‘that when'the lower pair cl of third, as the case may be—and comprises a line-wipers is Operating in the ?rst level the cast framsA, ada ted te'supporh the retatee upper air cis out of use and swinging around hie and vertically-movable switch-shaft B in a p ane just below the row of terminals and other ‘operative parts in suitable posi» representing the second level of the switch I25 trans. As previously explained, a switch of with the first or lowermost horizontal row in this character is designed for use as a medié the bank 0; on the other heed; when the urn ‘which'a' telephone subscriber may es pair '0 of line-shaft wipers is working in the tablish connectiqn between his line ‘and a said second level of terminals the lower pair (1 6.5 trunk-lineor between a trunk-line already is then out of use andmoving in a horizontal 130 , . 4: 815,321 plane between the ?rst and second horizontal being suitably clamped to the shaft B and in rows of terminals in the bank I)——that is, be sulated therefrom. These shaft-wipers may tween the rows of terminals representing the be of any suitable form or character, but are ?rst and third levels of the switch. It will preferably of the shape and construction be readily understood that the shaft-wipers shown more clearly in Fig. 44, each wiper 70 are insulated from the shaft and that the comprising a pair of superimposed strips of members of each pair are insulated from sheet metal, having their enlarged or middle each other, and in use the upper members of portions suitably clamped to the shaft and the two pairs are connected together and rep provided at their rear or outer ends with ter minals for making solder or other wire connec 75 IO resent one side of the “line-circuit,” while the lower members of the two pairs are con tions. The contact end of each wiper (“pri nected together and allotted to the other side vate ” or “ line ”) consists of the slightly-sepa or parallel limb of the circuit. In this way rated end portions of the two superimposed the switch is capable of establishing any one pieces of metal, the same being ada )ted to 15 of substantially a hundred possible connec receive and engage the upper an lower tions, as will hereinafter more fully appear. surfaces of the terminals, either private As shown, the said line-banks are supported or line, as the case may be. In this way by rods or hangers a, the latter being ar each line-shaft wiper has an upper member ranged vertically at each side of the switch— or switch-arm adapted to connect the so shaftB and having their upper ends rigidly called “vertical line conductor” of the sub 85 secured to the lower portion a’ of the frame. scriber’s line with the corresponding“ side ” or The so-called “private bank" E is similar in “line” conductor of the desired trunk-line, general form and construction to the other and each line-wiperalso has a lower member banks, but contains ten horizontal rows of or switch-arm adapted to connect the so 25 contacts instead of ?ve, and as another dis callec “rotary line conductor” of the sub 9O tinction each horizontal row of contacts in scriber’s line with the corresponding side or this private bank is made up of ten terminals, line conductor of the said trunk-line, and if each consisting of a single contact, as shown the switch is used as a second, third, 6120., se more clearly in Fig. 45. In this way each lector then the opposite sides of one trunk line-terminal has a corresponding terminal or line are connected, through the medium of 95 contact in the private bank, the object and the two members of either line-wiper, with function of these private-bank contacts be corresponding sides of another trunk-line. It ing hereinafter more fully described. Like will be understood that the relative arrange the line-terminals in the line-banks, the pri ment of the shaft-wipers is such that each vate-bank contacts are all suitably insulated time a line-wiper engages a line-terminal the I00 from each other, and in each case the con “private” wiper enga es the corresponding tacts, with their interposed insulation, are contact in the private bank. Preferably the clamped together by means of bolts and up three banks of contacts are removably mount per and lower clamping-plates. For exam ed upon’ the said rods a, and the arrangement is such that they can be readily adjusted 105 40 le and as shown in Fig. 45 the rivate ank contacts e, together with their inter— ‘thereon, so as to insure the ‘correct or neces— posed insulation, are clamped between upper sary (position of each bank-terminal to its al and lower plates 6’ and as, the latter being lotte shaft-wiper. Furthermore, by mak drawn and held together by means of clamp ing the banks se arate and each removable 45 ing screws or bolts 63. Each line-bank, as as a unit from t 1e balance of the structure I10 50 screws 02 and upper and lower clamping the one s own in Fig.’51. t will be seen 115 that each collar (12 is adapted to ?t and slide - the manufacture and repairing of the switch sulated from each other and held in ?xed rela is greatly facilitated. As shown, the banks ative positions, the whole ‘being held,and are separated from each other and clam ed clamped together by means of bolts and ?rmly in lace by means of s lit collars ike shown in Fig. 49, has its contacts suitably in plates 03 and 04. Preferably the end of each ine-bank is provided with a brass covering-v upon one of the vertical supportin rods or plate—such, for example, as the notched hangers a and is provided with a c amping plate 05 shown in Figs. 46 and 50—as a pro screw 03. Furthermore, each collar is pro 55 vision of this character appears to have a vided with an upwardl -extending and hook I20 bene?cial effect in reducing static action and shaped lug a‘. It wil be observed that the cross-talk. The private-shaft wiper c‘ is sin upper and lower clamping-plates of the three gle in character, inasmuch as it only engages banks have their end portions provided with one contact at a time and is removably se openings adapted to receive the rods a, it be cured to the shaft B and suitably insulated ing possible in this way to secure the rods to the frame A, and then insert the lower ends therefrom. (See Fig. 47.) As shown in Fig. 48, each pair of line-shaft of the rods through the openings in the said lates. The private bank can be ?rst ad wipers comprises an upper and lower switch arm or movable contact, the two being insu ]usted into place in this manner, and then the 65 lated by interposed insulation and the whole upper line-bank O, and finally the lower line 130 815,321 3 bank D, and as soon as the private bank is scribed positions and to return the same to adjusted to the desired position it is then their normal positions when the shaft is re clamped and held in place by the application leased from any position to which it may have to its lower clamping- plate of two of the been rotated for the purpose of makinfr the de rings shown in Fig. 51. The method of ap sired connection. The arm 55 is provided with plying these rings consists in slipping them a sto 1)’, adapted to be enga ed by the so 70 upwardly upon the said rods (1 and then calle "normal-post” arm I)“, t e latterbeing slightly rotating them until the lugs a4 en rigidly secured to the shaft B by a clamping gage the edges'of the lower clamping- late of screw or key device I)". Normally the arm the bank in the manner shown in ig's. 44 b8 engages another downwardly-projecting and 52 and as shown in Fig. 2. When thus stop u on the arm 125 just to the right of the 75 applied, these hook-shaped lugs a‘ reach up norma post I)", so as to keep the shaft-wipers wardly and slightly over the end edges of the in their normal positions; but should- the lower clamping-plate of the bank, and when shaft be rotated to the limit of its movement the screws a3 are then tightened up the bank in such direction the arm 718 will then'strike 80 is locked or clamped ?rmly in place. A‘ sec the stop b". In this Way’the said lug on the ond‘ pair of clamping-rings is t en applied in arm 65 immediately to the right of the nor the same manner to thelower clampinge late mal-post arm 1)" serves as a stop to limit the of the bank C, as shown in Fig. 2, an the rotary return movement of the/shaft, while 20 third pair to the lower clamping-plate D. In the lug or sto 67 serves to limit the operative this wa these rings a2 not only separate the rotation of t e shaft in thegdirection neces banks from each other, but also ' clamp 0r sary for picking out and making connection ?rmly lock the same in lace upon the verti with the proper trunk-line. It will be under cally-disposeld rods (1. ach bank is adjust 25 able inde endently of the others, and conse quently the correct position of each bank rela stood, of-course, that the stop 127 is only en gaged by the arm b8 at such time as the shaft 90 may have been caused to rotate to an extent suflicient to carry the shaft — wipers clear tively to its allotted wiper is insured. N or mally the three wipers on the shaft remain across the banks—that is, to the end of any out of use and at points just below the ?rst level. inrwhich the shaft-wipers happen to be level of the switch and in the position shown operating. - This normal-post arm b8> has a in Fig; 44. In order, therefore, to make con further function, as it is provided with a nect'i on with the ?rst line-terminal in the ?rst piece of insulation b1", adapted to normally level, the shaft must be given one vertical engage the intermediate sprinor b11 of a step and then one rotary step, as will herein spring-switch carried by the top of the frame. 35 after more fully appear. ' The mechanism or electroma netically . actuated machinery for operating t e switch Consequently the said spring I)“ is normally in ICO engagement with the lower spring b12 and out of engagement with the upper spring or con_-' contacts thus constructed is as follows: As tact b“. As soon as the shaft makes one ver stated, the frame A is provided with lower tical step, however, the spring!)11 is released, 40 laterally-projecting portions a’ifor sup ort and thereby permitted to break contact with hr ing the stationary switch-contacts. t is the spring I)12 and make contact with the 05 also provided with a lower horizontal portion . spring or switch-contact b‘“, as will‘ herein (1-5, w rich is inte ral with the~ said portion a’ after more fully appear. Between its ‘upper and also with t e vertically-disposed back and lower bearings the said shaft provided A shaft-bearing a.’ is secured to with vertical‘ ratchet-teeth I)“‘ isand with the under side ‘ofthe frame, while a similar rotary ratchet-teeth 61"’, the 'latter’being‘ ar hearing as- is secured to the to or “upper por ranged below the former. ' BEti’il’tveiiiv the tion a9 of the said frame.‘ These bearings rotary b15 and thelower shaft may be of suitable character and are adapted bearingratchet-teeth a7 the shaft is provided with a split 45 portion. a“. 50 to support the shaft B in both its rotary and sleeve Tb1", adapted normally to rest upon the endwise movements. At its up er end the u per surface of the bearing a’ and adapted said shaft is provided with a cloc r~spring de a so to serve as a cam. or stop device for the vice b, preferably of the character‘ shown hereinafter-described side switch.‘ The so-' more clearly in Figs. 2,2 ‘and ‘23'. As shown, called “vertical ratchet-teeth” are prefer 55 the said device comprises‘ia clock-spring I)’, ably ten in-number and corres 0nd 'to the having its inner end suitably‘ secured to'the ten previously-described levels‘o the switch. stationary hub bz-and its outer end secured rotary ratchet- teeth are su?icient in to the shell or housing b3. The said shell or The number to permit the shaft'to be given ten housing is secured to the'shaft by means of a 60 screw or key 6‘, while the said hub is rigidly rotary ste s, it being remembered that'each bank—leve_ contains ten’ operative positions connected with an arm‘ b5, held stationary by that is, ten positions for‘making connection means of the so-called “normal post” I)“, with as many different trunk - lines. As which is secured to the top of the frame. The shown more clearly in Figs/1,16, 41, 42, and . ' tension of the said spring is such as“ to normally 4-3, the vertical ratchet-teeth are provided with a vertical and'longitudinally-extending I30 65 hold the shaft-Wipers in the pfreviouslyéde 815,321 6 channel I)". As shown in Figs. 1, 2, 40, 41, shaft is given a second step, the said dog b20 en‘ and 42, this channel is normally engaged at gages the second tooth, and so on. Therelease its upper end by the stationary supporting magnet F has its cores secured by a bracket f dog I)“, the latter being secured in any suit to the forward vertical portion of the frame, able manner to the vertical front portion a" the said magnet beingipreferably arranged in of the frame. It will also be seen that this the space between t e vertical portions 0,10 stationary supporting~dog normally engages and a“ of the frame and the horizontal por that portion of the channel or groove b“ tionsa.12 and a”, and it will be seen that the which is cut in the cylindric collar 1)”, thus cores of the said release-magnet are arranged horizontally one above the other. At the IO preventing rotation of the shaft when the lat ter is in its normal position. As soon as the top the said frame is provided with ears a“, shaft is given-one vertical step, however, the containing pivot-screws adapted to engage the collar b19 is raised to a oint where its under upper end of the armature f ’, the latter being surface is at a level witfi the upper surface of arranged in operative relation to the poles or the supporting-dog b“, whereby the shaft if free ends of the “release - magnet cores.” The said armature is normally held away ceived by the dog I)” and supported in its from the said release-magnet by a flat re rotary movements, as shown in Fig. 43. tracting-spring f 2, the same having its upper When the shaft is given two vertical steps, end secured to the top of the frame by a screw the ?rst circular tooth is raised to a level f3 and having its lower end slightly notched where its under side is flush with the upper and adapted to engage a lug f 4, carried at the rotated after having been thus raised is re side of the sup orting-dog b“, whereby the shaft, if rotated at such a level, will be re ceived, as in the previous case, by the sup 25 porting-dog I)“ to carry the weight of said shaft during its rotation. In th1s way and regardless of the level to which the shaft is lower outwardly and upturned end portion of the said armature. Abracket f5 is secured to the frame and provided with an adjustable screw f6, adapted to act as a stop for limiting 90 the outward movement of the said armature. At its lower upturned portion the said arma adjusted or stepped up the supporting-dog ture is provided with a link f7, having its b18 is always ready to receive the shaft if ro outer or free end formed with an ‘opening f8. tated. Furthermore, the- shaft can only Normally the said opening f S engages the move vertically when the stationary sup lug I)“, carried by the rigid structure of the porting or looking dog I)‘8 is in engagement two locking-dogs. Consequently the spring with the groove or channel I)”. Conse 7'2 not only keeps the armature f’ normally quently the u ward movement of the shaft al retracted, but also through the medium of the I00 ways takes p ace before the wipers have been " link f 7 maintains the two locking-dogs nor 35 mally out of engagement with their respec ward or release movement of the shaft always tive ratchet-teeth. When energized in any takes place after the wipers have been rotated suitable manner, the said magnet attracts its or swung completely out of engagement with armature, and thereby pushes the opening the bank-contacts. Normally the two rig {8 into engagement with the projection b", idly- connected locking - dogs 1720 and b“ are and then when the magnet is deenergized out of engagement with the ratchet-teeth, the spring f ‘1 retracts the armature, and there the former being allotted to the vertical by pulls the two locking-dogs b21 and I)22 out ratchet-teeth and the latter tothe rotary of engagement with their respective ratchet ratchet-teeth. These, two rigidly-connected teeth. Referring to Figs. 38' to 43, inclu~ 45 given any rotary movement and the down locking-dogs are mounted to swing about a sive, it will be seen that the so—called “ver tical magnet” G has its upper end suitably 1222 and a small upwardly-projecting, lug b”, secured to the under side of the frame portion vertical axis and are provided with an arm as shown in Figs. 18, 20, and 21. The double a‘13 and oocupiesa position immediately back locking - dog device thus provided can be of the said release-magnet. The armature made in any suitable manner and provided g of the said vertical magnet is preferably with bearings b2‘t affording the said vertical ' mounted to vibrate about a horizontal axis, axis. The upper of said bearings preferably it being provided with adjustable hearings or consists of an adjustable screw bf’, whereby pivots g’ . This armature g is provided with I20 an L-shaped lug g", adapted to reach under 55 any wear or lost motion may be readily taken the link)”, so that when the said armature is up. A spring b2“, having its upper end screw fastened to the frame, is adapted to bear upon attracted the said link is lifted out of engage the structure of the two locking-dogs and to ment with the previously-described projec yieldingly hold the same in engagement with tion bf, and in this way the locking-dogs b“ their respective ratchet-teeth when the switch and b“ are immediately released upon the 25 is in operation. Whenever the shaft is given energizing of.the magnet G. In addition one vertical step,rthe locking-dog b” so en the armature‘ g is provided with an arm g”, gages the under side of the ?rst or uppermost having- its end pivotally connected with a ratchet-tooth as to support the shaft in its “vertical ratchet-pawl” g‘. As shown, this 65 raised position, as shown in Fig. 19. If the pawl is subject to the tension of a spring 9‘, 130 815,321 which is fastened to the rear end of the pawl rotary pawl ha. A somewhat similar device at one end and to the arm 93 at its other end. It8 is employed as a stopfor limiting there Consequently the normal tendency of the traction' or back movement of the arm h’ pawl 94. is to enga e. the vertical ratchet when the magnet H is deénergized. The teeth I)“. Pre'ferab , however, the arma other guide it” for this rotary pawl consists, ture g is held normally retracted——that is, preferably, of a iece of metal pressed or 7o. in the depressed position-—by means of a ?at otherwise given t e desired shape and ad spring 9“, havin one end secured to the under justabl held in place by a screw h“) passing side of the sai armature and its other end throng a slot formed itherein~that is, ad IIO notched and adapted to engage the T-sha ed justably secured to the frame A. It is desir . screw-threaded adjustable stop or mem er able that this guide h" be capable of accurate 75 g’. With this arrangement the said T and delicate adjustment, and for this pur shaped screwlthreaded member g7 can be adjusted for the purpose of Varying the ten pose an adjusting-screw h11 is provided and arran ed in positlon to enga e the body por sion of the spring '9“ in'accordance with re tion 0% the said guide. As s own, the screw A; but when the armature g is attracted the its threaded socket in the frame and the guide h9 thereby adjusted in a horizontal 85 uirements. Normally the pawl g‘ engages it“ is .provided with a small ?ange h”, ada t t e guide g", which latter is stationary and ed to engage a slot h13 in the said guide. Wlth secured in any suitable manner to the frame this arrangement the screw it“ can be rotated pawl g4 is then forced by the spring 96 into en gagement with the vertical ratchet- teeth: plane, it being observed that the said guide n its upward movements the said awl is is provided with a pair of ears or cheeks h“, limited by the stop or ide °, which atter is adapted to embrace the ortion of the frame also stationary and ,if ,esired], may be simply upon which it is'mounte . A spring h“, hav 25 a portion of the frame A. When the pawl ing one end secured to the ‘armature h and strikes the stop g", the shaft is of course then the other end notched and adapted to engage 90 looked against farther upward movement the T-shaped adjusting-piece hm, is employed . until the pawl is withdrawn and the vertical for yieldingly holding the said armature magnet again energized. (See Fig. 39.) away from the rotary magnet H. The ten With such construction the alternate attrac sion of the said spring can be regulated by tion and release of“ the armature g is accom rotating the T-sha ed and threaded adjust panied by an alternate engagement of the ing-piece h“, the latter being screwed into pawl g4 with and disenga ement from the the frame. In this way the pawl 71.3 is forced vertical ratchet-teeth, resu ting in a vertical by the guide h" into engagement with the 35 step-by-step movement of the shaft B. In ratchet-teeth h“ each time the magnet H is other words, the shaft is given one vertical energized. Furthermore, said stop or guide 100 step each time the magnet G is energized, it9 serves as a means for holding the pawl and the locking-dog I)20 promptly enga es ?rmly against the beveled forward surface of the vertical ratchet-teeth, and thereby ho ds the next tooth when the end of the rotary - ‘ the shaft against downward movement while step is reached and for' thus positivel lock the spring g“ is retracting the armature g. ing the shaft against further and un ue r0 Figs. 38, 40, and 41 Show'the shaft in its nor tary motion until the pawl is withdrawn and mal position; but in Fig. 39 the vertical the magnet again energized. (See Fig. 6.) magnet G is shown energized and the shaft 45 B as having been stepped up to the sixth As will be seen, the magnet is not defe'nergized until after the pawl is engaged by the stop I10 level. h", so that the ‘rotary magnet continues to The rotary step-by-step mechanism is attract its armature until after the rotary step shown more clearly in Figs. 4, 5, and 6. It is completed. When this magnet is deén will be seen that the rotary magnet H is suit- * er