US815176A - Automatic telephone connector-switch. - Google Patents

Description

No. 815,176. PATENTED MAR. 1 3? 190 A. E. KBITH & J; & 0. J. ERIOKSON. AUTOMATIC TELEPHONE CONNECTOR SWITCH.-

APPLIGATION FILED APRHZ I, 1905.

8 SHEETS-SHEET l.

No. 815,176. PATENTED MAR. 13, 190 A. E. KEITH & J. & 0.";r. ERICKSON.

AUTOMATIC TELEPHONE CONNECTOR SWITCH. APPLICATION FILED APR.21, 1905.

s SHEETS-SHEET 2 v (Z amcw Y r 23 *PATENT'ED.-MAR.\1 3, 1906. v A'. E. KEITH a; J. & 0. J. ERIGKSON. AUTOMATIC TELEPHONE CONNECTOR SWITCH.

APPLIGATION FILED APR.21, 1905.

- 8 SHEETS-SHEET 3.

No; 815,176. PATENTED MAR. 13, 1906.

A. B. KEITH & J-. & 0. J. ERIOKSON.

AUTOMATIOKTELEPHONE CONNECTOR SWITCH.

- APPLICATION FILED APR.21, 1905- 8 SHEETS-SHEET 4.

PATENTED MAR. 13, 1906. OKSON.

A. E.-KEITH M. & 0-. J. ERI

AUTOMATIC TELEPHONE GONNEG TOR SWITCH. 1905.

APPLICATION FILED APR. 21, v a snrzmsrsnnm' 5.

Ill

mumm

llllllillllllllll- No. 815,176. PATENTED MAR. 13, 1 906 A. E. KEITH & J. & 0. J. ERIOKSON.

AUTOMATIC TELEPHONE CONNECTOR SWITCH.

APPLIOATION IILED.APR.21, 1905. I

8 SHEETS+SHEET mun PATENTED MAR. 13, 1906. IGKSON. 1

' A. E. KEITH & J. & G. J. EB AUTOMATIC TELEPHONE GONNEG TOR SWITCH.

APPLICATION FILED APILZI, 1905. v.

8 SHBETSSHEET 7,

scri er for making t ica N TED STATES I ALEXANDER n- KEITHQ'JO'HN ERIOKSON, AND CHARLES' .i 'ERI'o soN, .oi

or CHICAGO, V ILLINOIS.

. i ialaan th n 21, 1965. serial-m. 256, 04. a

To all whor rtiitma4y.cortcennk Be it known that we, ALEXANDER E.KEITH,

JOHN EmoKsoN, and CHARLES J. ERIcKsoN,

d the line of the.called'subscriber that is, the. subscribers line with which the connectorcitizens of the UnitedStates .lof America,.an residents of Chicago, Cook county, Illinois, have-inventedfia' certain new and useful Improvement in Automatic Telephone Connector-Switches of which the following is a specification..

, ing-machines of that particular 1; e in which v ;a rotatable and endw-ise -mov'a le' switch- Our invention relates toautomatic switchshaft is employed for operating the switchcontacts by which any one of a numberof possible connections can be made, according to the number which the subscriber is calling,

and in which electromagnetically actuated means are employed for giving the shaft its;

step-by-step rotary and endwise movements. In this particular case our invention relates 'more particularly to automatic switchingmachines of this character, which are employed as connector-switches and-which are commonly known as connectors.

In' automatic telephone --exc han es 'the' switches or switching-machines ,w 'ch're-.

ceive -number im ul ses and which automatically select an id e trunk-line are called selectors; but the switches, .each of which is ada ted'to be employed by'the calling subknown as connectors. The step-b ste rotation of at selector is automatic 111 this respect that Its switch-shaft rotates automat-.

switchboard operator and is directly under Consenumber of impulses for giving a connector the deslred extent of vertical step-by step movement-and then sends one or more impulses for giving the sw itch-s'haft'of the connector the desired extent of step-byestep rotary motion, it being understood that a selector performs an operationcorresponding to a single digit of the called number. while a connector performs a general operation 'cornposed of two distinct or successlveo erations representing the last two digits of t e called e final connection directly with'the called-'subscribers line, arey until anidle trunk-line is found. As. distinguished from this the rotation of a connector is only automaticin the sense that the operation does not require the services 'of a 'i atented March.13,.1 9b6.'

with means for establishin fa guarding-ponu'mbei'. =A connector is desirably provided tential at all switch-termina s connected with makes the final connection-and in this way there is no danger'of the said called-sub scribers line being seized by other subscribers conversing or, befo'reifthe called subscriber while the calling and ,called subscribers are answers. It is also evident, however, that while aselector is desirably provided with means for'insuring an'automatic rotation of its I switchshaft iuntilan idle trunk-line is found a connector must as distinguished from this be provided with means whereby it will automatically release and resume its normal condition in case the called-subscribers line is found busy-that is, already in use. Furthermore, a connector is also desirably provided with means whereby the I calling subscriber in case the line which-he is v I calling is busy willreceive a busy. signal as soon as he attempts to'ring the bell at the called-subscriber's station. lectors and connectors are desirably ro vided with electromagneticallyoperate release mechanism by which the switches can be released and the connections broken after 7 r i the conversation is terminated; but in a connector we it preferable to effect a release and restoration of the mechanism by the en- Again, both se-' f ergizing of the -release-magnetthat is, i

we find it referable to release the mechanism upen't e energizing of the release-magnet and before the latter s 'denergized while in a selector it is customary and pref erable to. so arrange the mechanism that the release and restoration of the selectors will not take place until the releasema'gnetof each selector is denergized. I 7

As stated, our present invention relates to automatic switching-machines for use as connectors, and the nature of these connectors .4

and other distinctions between the same and will hereinafter the well-known selectors more fully appear.

I Generally stated, thBObjGOl) of our inventio'n'is the provision of an improved, sim lified, and highly efficient automatic switching machine a apted more particularl for use as a connector; to 1mpr ove,.'n 1o ify, and adapt a switching-machine mechanism of this particular character for use as a connector, and to provide certain details and features of im rovement tending to increase the general e ciency and seryiceability of a switching-machine of this particular type or construction.

A special object is to provide, in connection I with the other essential features of a connector-switc of this character, anim roved In'the accom anying"drawin-gsj Figure 1 is a left-hand si e elevation of a connector-.

switch embodying the princi les of our invention. Fig. 2 is a front e evation of the same. Fig. -3 is -a right-hand side elevation of the said automatic switching-machine or connector. Fig. 4 is a detail plan view of the top of the switching-machine. Fig. 5 is a vertical section on line 5 5 in Fig. 4. 'Fig. 6 is a horizontal section on line 6 6 in Fig. 5.

Fig. 7 is a perspective of one of the jacksprings on the switching-machine. Fig. .8 is a face view of the j ack-springs on the switching-machine. Fig. 9 is a section on line 9 9 in Fig. 8. Fig. 10 is a perspective of one of the jack-springs on the stationary frame or rack. Fig..11 is a face view of some of the j ack-springs on the rack or support. Fig, 12 is a section on line 12 12 in Fig. 11. is a detail view showingthe manner in which a jack-spring on the switchingmachine engages a stationary jack-spring on the frame or supporting-rack. Fig. 14 is an enlarged plan view of one of the banks of line-contacts. Fig. 15 is a section online 15 15 in Fig. 14. Fig. 16 is a similar section through the private bank. Fig. 17 is an end view of one of the line-banks. Fig. 18 is a perspective of the end plates of the line-banks. Fig. 19 is a detail -sectional view of the private-bank wiper. Fig. 20 is .a similar view of one of the line-shaft wipers. Fig. 21 is a perspective of one of the rings or collars employed in securing the banks of contacts to their supporting rods or hangers. Figs. 22 and 23 aredetail sectional views showing the method of applying the said rings to the rods or hangers on which the banksof contacts are supported, Fig. 24 is an enlarged side elevation of that portion of the switchingmachine involving the so-called private andfrotar magnets, the rotary ratchetteeth, an the side switch. Fig. 25 is a plan of the devices shown in Fig. 24. Fig. 26 is a detail horizontal sectional view showing adiflerent portion of the ratchet mechanismshown in Fig. 25. Figs. 27 to 31, inclu- 33 is a similar view showing the ratchet mechanism in a different position. Fig. 34 is a front elevation of the devices shown in Fig. 32. Fig. 35 is a detail side elevation of the grooved or channeled side of the vertical ratchet-teeth. Fig. 36 is a detail horizontal section just above the vertical ratchet-teeth. Fig. 37 is a similar view showing the parts in different positions. Fig. 38 is a detail side elevation of that portion of the switchingmachine involving the so-called releasemagnet and locking-dogs. Fig. -39.is a front elevation of the devices shown in Fig. 38. Fig. 40 is a view of the other side of the mechanism shown in Fig. 38. Fig. 41 is a view similar to Fig. 39, but showing the parts in difierentpositions. Fi 42 is a pers ective' of the spring arm pr ink employe for normally holding the double locking-dog out of engagement With the vertical and rotary ratchet-teeth, showing the same disengaged from the projection carried by the lockingdog. Fig. 43 is a similar view showing the spring arm or link in engagement with the projection on the double lockin -dog. Fig. 44 is a detail horizontal sectiona view showing the side switch in plan. Fig. 45 is a similarview showing the side switch in a different position. Fig. 46 is a perspective of the side switch, operating-arm, and adjacent parts. Fig.47 is a side elevation of the side-switch wipers and switch-contacts. Fig. 48 is a view similar to Figs. 44 and 45, but showing the side switch in a different position. 49 is a bottom view of that portion of the frame which supports the side switch, showing the side-switch wipers and contacts. Fig. 50 is a detail sectional view showing the key or device'for regulating the tension of..the .side-switch spring. Fig. 51 is a diagrammatic'view showing the circuit arrangement of the connector and also showing certain parts of the connector mechanism in perspective, so as to give a clearer idea of the relation between the circuits and the mechanical parts or mechanism.

As thus illustrated, the switching-machine, commonly known as a connector, comprises a cast frame or body A, preferably of non-magnetic material, and provided with a lower horizontal portion (1, having a pair of forward and laterallyrojecting' ears or pertions a. The vertical disposed and rotatable switch-shaft B is supported in a lower bearing a, secured to the said portion a, and in an upper bearing 0 secured to the forward portions of the to or upper horizontal portion a of the said fiame or body. The

ICC

I I said shaft rovidd it li ifi p n b and b"; and a so with a so-called' private'.

-.wiper bi; Thesaid line-wipers are each preferably composed of a 'pair of spring in gers or arms, with insulation so applied that they are not onl insulated from-each other,

' -but also; from t e switch-shaft upon which the sw1tch-shaft.- An suitable means Jcan:

they. are mounted.v --(S e Fig. 20.) Refer ring toFig. 19, -howver,it W1ll be seen that the private wiper is com osed of" two similar. spring fingers-or arms ut' in this case the sameare. not insulated. from each other, althou h, of course, they are insulated from be employed'for securlng these three wipers" or s g switch-armsto the endwisemovable and rotatable switch-shaft B. The

supportingrodsfor 'li'an ers a have their '11 ate, the different levels being separated from er ends secured to t 'portion' a of t e ame'or body and are of suflicient lengthto permit the upper or rivate bank C and also the lower or line ban s D and E-to be strungthereon and suitably secured place by' means of split collars or clamping-ringsa. Referring to Fig.16, itwill be seen that the so-called private bank Othat is, the bank of switch-contacts known as private'con- =tacts is composed of substantially one.

hundred terminals, each consisting of a single contact and all arranged in horizontal rows of ten terminals each. Inthis way there 'are ten levels at which the switch-shaft may opereach other by suitable insulation, and it will lation is so a plied-that the said terminals or private ba contacts are insulated from-- The rivate-bank contacts-are also be understood, of course, that the insueach other; all bound and hel togetherby means of the upperandlower clamping-plates 'c and c and by means of the bolts or screws 0 ex-.

tending downwardly therethrough. The forward ends of these private-bank contacts are .adapted to be engaged by the-said private corres onding to the line contaotsor termi-.

nals '0 this particular connector. In Fig. 15

:it'will be seenthat' each line-bank comprises substantially fifty terminals arranged in horizontal rows of ten, terminals each, and each terminal in this case, how'ever, consisting of two'contacts'insulated'from each other and' from the balance of the structure.

seen' that the relative arrangement,is such It will be that one set of-line-2Wipers on the shaft will swing idly between two horizontalrow's of line-terminals, while the other line-wiper is traversing a horizontal row of line-terminals in the other bank; In this way the two hnebanks'really constitute but'one bank of lmecontacts-that is tosay, but the bank of substantially one hundred line terminals, each terminal being connected with a, differentsubscribers line. Consequently while" one set of line-wipers is in use the other. is out of use but the private wiper on the shaft is always in use, no matter; at what level the shaft is operating. For example, while the lowerpair ofline-wipersb is travehng over' a row 0 line-terminals in the bank E the upper pair of line-wipers?) traveling idly and out of contact with any of the terminals in the bank D but should the shaft be given while under such conditions the lower pair of lin'efwipers is traveling idl and -out of contact with all terminals in the ower bank E. In this way the shaft at one level --'one more vertical step then the upper pair [Of line-wipers is brought into use and caused -to travel upon a row of line-terminals in the bank D uses-the lower pair of line-wipers and the lower bank of lineterminals and then at the next level it uses' the up erpair of line-wipers and the upper bank of 'ne-terminals. Consequently there are ten operative levels for the shaft and its contacts but the line-wipers alternate, one air being used at one level I and the next palrbeing brought into use upon the steppin up of the shaft to. the'next level, I

and so on t oughoutthe different levels at which the .shaftisj capable of rotating. As stated, howeveig'the rivate wiper is always in use regardless of wgat level the shaft is operating in. It is found moresatisfactory to divide the line-terminalsinto twobanks and to use two pairs of linewipers,.for the reason that this arrangement involves-less vertical movement on the part of the shaft than would be the case were the line contacts or terminalsall arranged in one ban-k for it" will be seen. that the line-terminalseach consists of two contacts, one for eachside of the linecircuit, whereas. the terminals in the private bank are of such character that each'row'or I level consists simply of a series of single contacts. In this way it is possible to satisfactorily arrange the ten levels of the private bank; in a single bank of contacts of the same eneral dimensions'and the same height as a bank of line-terminals containing only five horizontal rowsof terminals.

the entire vertical movement of the switchshaft maybe substantially the same as the height or thickness of one of the banks of contacts, whereas if only one pair of line-wiperswere employed in conjunction with a single bank of ine-terminals the shaft would then.

.be required to move u and down to aneirtent equal to the com ined height or thickness of the two line-banks shown in Figs. 1, 2 and 3. It will be understood that the arrangement of bank-contacts is such that a calling subscriber may cause the switch-shaft to firstrise to the desired level, so as to en- I It-is evldent, V v therefore that with thearrangement shown able the connector to pick out the particular group of subscribers in which the called subscriber is included, and to then cause the switch-shaft to rotate in a step-by-step manner until the line-wiper in use picks out the particular terminal connected with the line of the called subscriber.

The split collars or clam ing-rings a are each provided with a hookike lug a and a clamping-screw a said lug being adapted to engage the edge of the lower plate of one of the banks, as shown in Figs. 2 and 22. When tightened up, theseclamping'rings not only keep the banks properly separated and permit them to be adjusted independently of each other, but also fasten the banks securely in lace and in position to be properly engaged y the wipers or switch-arms on the shaft. The end of each line-bank is preferably provided with'a brassend plate, such as the one shown in Figs 17 and 1 8. The said switch-shaft is preferably returned to its normal position after it has been rotated by means of the clock-spring-device b (See Figs. 5 and 6.) One end of this spring is secured to the casing b, which latter is in turn secured to a hub b having a suitable connection with an arm-b. This arm is adapted to enga e the normal post b and to move u and own thereon in conformity to the vertlcal movements of the switch-shaft. Consequently when the shaft is rotated from its normal position the spring 11 is wound up and iven sufficient tension to restore the switc -shaft to its normal position when the connector is finally released. A so called normal post-arm b is secured to the shaft B and adaptedto normallyengage the stop I)", carried by the arm bthat is, when the switch-shaft is in its normal o'sition. It will also be seen that this norma ost-arm is ada ted to normally engage a switch-spring I) or the purpose of keeping the latter nor;

mally out of contact with the switch arm or contact I).

At its back the frame or body of the connector is provided with a suitable number of jack-sprin s F, adapted when the connector 18 adjuste in place to engage the stationary jack-springs F on the frame or supportingrack. In this way each connector can be readily adjusted in place on the frame or rack without the necessity of making or breaking any wire or solder connections, the mutual engagement of the stationary and movable jack-springs being sufficient to close all necessary circuit connections.

The mechanism for giving the switch-shaft a vertical step-by-step movement consists of vertical ratchetsteeth b on the switch-shaft and of a so called vertical magnet G, adapted to operate a vertical ratchet-pawl It will be seen that these ratchet-teeth t" are sufficient in number and of such character as to permit the shaft to be actuated bank-contacts.

ten times in a vertical or endwise' direction, so as to raise the shaft to the desired level of The so-called vertical ma netr G can be secured to the frame or body in any suitable manner. As shown, the said vertical magnet comprises two cores and two windings provided with a single armature g. This armature, it will be seen, is pivoted at g and is therefore adapted to vibrate or swing up and down about a horizontal axis. The arm 9?, which is rigid with the said armature, is provided with an L-shaped lug 9 adapted to reach under the flexible arm or locking device h, as will hereinafter more fully appear. At its end the said arm g 'is pivotally connected at g with the said ratchet-pawl g. It will be seen that the said pawl is subject to the tension of a spring g, by which the same is pressed into yielding en agement with the vertical ratchet-teeth on the shaft. The return movement of the armature is accomplished by the use of a retracting-spring g having one end portion secured to the said a1 mature ,and the other end thereof provided with a notch ada ted to engage the head of the T-shaped an rotary screw-threaded adjusting member 9". In this way the tension of the spring 9 can be varied or regulated by rotating the thumb-screw or rotary threaded adjusting device g", the latter being screwed into a threaded socket in the body-frame, and thus adapted for up-and-down adjustment. The said pawl g is guided into and out of engagement with the ratchet-teeth by means of the guides g and g, the latter being adjustably secured to the body-frame, while the former is shown as being integral with the said body-frame. In this way the alternate energizing and 'denergizin of the said vertical magnet produces a vibratory movement of its armature and a consequent 'step-by-step vertical movement of the switchshaft, due to the reci rocating ratchet-like action of the pawl g. y referrin to Fig. 33 it will be seen that the stop or guide 9 serves as a means for enabling the pawl g to posi tively lock the shaft against upward movement after the pawl has reached the limit of its upward movement. In this way the shaft stops promptly in its u' ward movement each time it reaches the en of an upward step, as it cannot move upward while the pawl g is held tight against the top of the next tooth by the stop g Normally the vertical groove or channel I), extending throu bout the series of vertical ratchet-teeth is engaged by the stationary supporting-dog or, rest I), the same being suitably secured to the body --frame A. Consequentl the shaft B can only move up and down whi e the wipers thereon are out of enga ement with the bank-contacts, andwhen t e shaft begins to revolve it is then supported by the rest I), it being understood that the latter is adapted to engage the under side of the artnular vertical ratchet-teeth 6 With this arrangement the shaft can be elevated to the desired position and may then be rotated at the level to which it has been adjusted, and

during such rotation and as a means of preventing a return or downward movement of the shaft while the locking-dogs are out of'engagement with the ratchet-teeth thereon the rest I) will perform its function of enga ing and serving as a thrust-bearing'for the ottom surface of the particular tooth with which it must enga e in order to support the shaft at the desire level. As stated, therefore, the shaft can only move up anddown while the restjor, supportin -dog b is in enga ement with the vertica groove or channe 1) and cannot be .restoredjto its normal level until after the shaft has beenreleased and allowed to rotate sufficiently to carrythe shaft-wipersiilear of' the line and private banks. During "the vertical. movement .of the switch-shaft and between thestep-bystep movements in this direction the shaft is supported by the vertical locking-dog b.

Figs. 38 to 43 illustrate the said double locking-dog and also the release magnet and its armature and connections with said double locking-dog. It will be seen that the double locking-dog H is not onl provided with the vertical locking-dog b, utis also provided with the rotary locking-dog h. This double locking-dog is also provlded with an arm 71/, having a T-shaped end portion h The bearings h and h are adapted to provide a verticall -dispose d axis, about which the ri id doub e do may swing or vibrate' In a dition the sai double dog is provided with a projection 71?, which is normally engaged by an opening it in the end of the flexib other end portion secured by a screw h to the magnet-bracket It". With this arran ement the two locking-dogs. of the said dou le do are held normally out of engagement wit their respective ratchet-teeth on the switchshaft B. It will be seen, however, that the said double dog is at all times subject to the pressure or tension of the flat sprin h the latter being suitably secured to t e body-' In this way the sa1d posed and provided with a core having one end portion thereof secured to; the magnetbracket h by means of a screw t. The other 'retracting-sprin t.

e armof spring catch device it, the latter havmg lts -mot1on.

end of saidrelease-magnetis, it will be seen,

i, the latter being hung at its upper end and provided at its lower end witha fin er i adaptedtoengage the arm h of the. ouble do Preferably the said armature 'i is prov1 ed at its upper end with a couple of engaging portions i adapted to engage and ang upon the opposite ed e portions of the upper horizonta end portion of this retractlng-sprm 1s suitably secured in place upon the top 0 the magnetbracket hby means of a screw i and that the two upwardly-projecting side portions '5 of said spring are adapted to engage the two portions '5? of the armature and to thus hold the latter securely -1n place against the end portion of the bracket h". The ower end portion '27 of the said retracting-spring is adapted to bear upon the It wil .be seen that the arrangedto act upon the swinging armature intermediate vertical portion of the said armature and to thereby act as a stop for limitthe outward movement of the latter,

W l'ien the said armature is attracted, its inward or forward; movement is yieldingly opposed by the pressure of the spring portions 1 a alnst the upper end or engaging portions'i of t earmature. Asillustrated,thebraclreth is com osedof horizontal and vertical portions, t e upper horizontal portion bein provided with a lug or ear h", adapted to e secured by screws' h to the adjacent vertical portion of the body-frame. I When the release-magnet I is energized, it attracts its armature i and in so doing causes the finger '1', to engage the double dog and force the two locking-dogs out of eng1 gement with their respective ratchet-teet When thus restored to its normal. or inoperative posltion, the said double dog is locked in place by reason of the automatic engagement of the apertured end portion of the spring-catch h with the lug h j 5 Figs. 24, 25, and 26 show the mechanism for iving the shaft a step-by-step rotary g It will be seen that the so-called rotary magnet" J is preferably composed of two cores and two windings suitablysecured to the adjacent'vertical' ortion of the body-frame A, These two e ectromagnets constituting the so-called rotary magnet are arranged in a horizontal position one above the other. and with their" free ends in position to act upon the vibratory armature y'. ThlS armature is pivotally mountedat j, preferably by means of cone-bearings se-- cured to the body-frame, and is thereb adapted to vibrate or swing about a vertlcally-disposed axis. As illustrated this rot'arymagnet-armature is provided with an arm 1' having its end portion'pivotally connected at j with the rotary ratchet-pawl 7'". This ratchet-pawl is, subject to the tension of a spring 9' which tends to force it into engagement with the rotaryratchet-teeth IIO . Fig. 26, as the sto 7" holds the pawl tightly against the bevele surface ofthenext tooth.

An adjustable stop j limits the outward or return movement of the arm j 'under the pressure or action of the retractin -spring 1 This retracting-spring is secure at one end to the armature j and provided in its other end with a notch adapted to en age the head of a T-shaped rotary screw-t eaded adjustin device j, which latter is screwed into a t .eaded socket in the body-frame.

, In this way the said adjusting device can be ro- Y to 50, inclusive, illustrate the socalled side tated, and thereby given an endwise move ment in a horizontal direction for the purpose of changing or varying the tension of the spring j employed for retractingthe rotary armature to its normal osition.

Figs. 24 and 25,27 to 31, inclusive, and 44 switch-that is, the switch which is operated by the 'so-called rivate magnet K. It will be'seen that this private magnet is horizontally dis osed and secured at one end to thebracket the latter being in turn secured to the adjacent portion of the body.- frame A.. At its other end the bracket is is pivotally connected at k with the swinging or vibratory armature This armature is provided with a horizontal and forwardlyextendin arm 10 having a downwardlybent en ortion 70. Upon this arm are mounted t e-up'per and lower flat springs k and 'k, .the same being separated the desired distance by the end ortion k. These springs are provided wit -u per and lower ratchet or saw teeth k an k the upper teeth being slightl out of line with the lower teeth. A piece 0 insulation is is secured to the said arm'and adapted to project between the switch-springs k and k, it bein observed that the former are normally cosed and thelatter normallyo en. These switchsprings are, together wit suitable strips ,or 1eces of insulation, secured to the to of the hracket k by means of screws 7c". he rear ends or terminals k" of these switch-springs are arranged in convenient positions for making. the necessary connections with the circuit wires. The side switch'L is-pivotally mounted at Z, and thus ada ted to swing orivibrate about a Verticallyisposed axis. At one end this side-switch arm or bod is provided witha finger 1, adapted tonorma ly project between into and out of en the two springs k and k, as shown in Fig. 27.

The said side-switch arm or body is also provided with a couple of In s Z and Z adapted, respectively, to engage t e body-frame and the cam l on the switch-shaft. At its other end the-said side-switch arm or body is provided with four spring-wipers Z Z, Z, and Z, all suitably secured in place by means of screws Z and insulated from each other and from the side-switch arm or body b means of the inter osed strips of insulation The contact-ma ing endportions of these wipers are adapted to en age the stationary contacts 1 ,1 .Z ,'an l, the said contacts being suitably secured to the body-frame by means of screws Z, each contact or terminal.-

being suitablyinsulated from the frame and also from the other contacts. In this way the said side switch has three operative positions, and in each position the wipers are all in contact with certain of the stationary contacts. In other words, the uppermost sideswitch wiper is adapted to cooperate with three stationary contacts, andeach of the other .wipers are adapted to cooperate with three similar con tacts, there being twelve contacts in all. The movement of the side switch is directly accomplished by the positive pressure or tension of the spring l, the same having its lower end secured to the key or tension-regulating devicel". With this arrangement the finger l of the side switch normally occupies the position shown in Fig. 24; but when the private magnet K is energized the arm is is then depressed and the finger Z made to occupy the position shown in Fig. 27tha't is, the said finger shifts from-its normal position in engagement with the innermost lower tooth into engagement with the innermost upper tooth. When the private magnet is then deener ized, the finger Z impinges on the point of the innermost lower tooth is, causing the spring is" to flex or bend in the manner shown in Fig. 28. These two flat springs by the time the private armature rcgains its normal position will be separated enough for the finger Z to clear the upper rearmost tooth. This permits the spring 1" to actuate the side switch from first to second osition with the lug Z resting against the inner edge I of the cam Z, as shown in Fig. 45, and leaving the finger Z nearly in engagement with the foremost lower tooth, as shown in Fig, 29. Then when the shaft is rotated the cam Z leaves the lug l and said finger Z falls against the foremost lower tooth. When the private magnet is again energized and dener ized, the finger 1 passes from second to third position, as shown in Fi s. 30 and 31, in a manner similarto that when it passes from first to second position. The first time the side switch is released its movement is limited by reason of the lug Z engaging the in Fig. 44. The next time the side switch is ITO , ro'ection or, ed e l of the cam l as shown actuated, however, the shaft B has partially rotated the said cam, as shown in Fig; 48, so that the final outward movement of the side switch is limited" by reason of the fin er Z engaging the stationary stop 1", the atter bein suitably secured to the body-fraine. It wi 1 be observed that each time the private magnet is energized its armature is pulled down against the tension of the springs 7c, these springs then returning thearmature to its normal position when the private ma net is deenergized. In this way a sprin sw1tch of suitab'e character, but preferab y composed of the two switch-springs shown in Fig} 24, provides the means for retracting the. armature of the so called private magnet When the release-magnet I is energized, it not only thereby'releases the'switchshaft, but it also restores the side switch. This is accomplished by providing the double dog H with the previously-mentioned 1 T- shaped end portion h and by connecting'this end portion with the side switch by means of a restorin -link'Z the latter being shown more clearly in Fig. 46. The connection between this release-link and the double dog is of such nature that the double dog can be released from its normal position and allowed to move into engagement with the ratchetteeth without'moving the side switch; butafter the connector has been operated in the desired manner and the subscribers are through talking the energizing of the releasemagnet then draws the double dog out of engiagement with the ratchet-teeth and in so 0mg causes the link 1 to move the side switch back to its normal or original position,

and at this juncture it will be seen" that the double dog is drawn out of engagement with the teeth on theswitch-sha ft at the time the release-magnet is energized and that the releasing of the connector is therefore accomplished promptly upon the closingof the-circuit through the release-magnetthat is, the release is accomplished without waiting for the deenergizing of the release-magnet. The said method of releasing the switch-shaft and allowing it to return to its normal position and the manner of supporting the re lease-magnet and adjacent parts constitutes one of the features which distinguish a con For example and as subscriber. It will also be seen, by referring .to Fig. 51, that the herein-described connector is provided with the back release-relays M and a ringer-relay N, as well as with the so-called vertical and rotary relays 0 and P, it being desirable that the connector be provided with means whereby the called subscriber may effect a release of the difierent switches 'in case the calling subscriber fails to make the release and also, of course,

whereby the calling subscriber may after establishing the desired connection between his line and the line of the called subscriber vthen operate a switch and cause the ringingcurrent to be projected onto the .circult through the connector and out over the called-subscribers line to the bell at" the latters station, and the calling subscriber after usin the connector may release the same.

T e circuit arrangement of the connector thus constructed may bechanged or varied to suit the conditions of different cases or requirements; but with the parts connected up in the manner shown in Fig. 51 the'electrical and mechanical operations of the connector are as follows: The impulse or impulses transmitted over the vertical trunkne conductor 1 in the usual or any desired manner cause the so-called vertical relay 0 to become energized as many times as there are impulses and to thereby in turn en-. ergize the vertical magnet G, causing the lat- :ter 'toattract its "armature and bring about the o erations already describedthat is,

' the re ease of the double dog H and the raising of the switch-shaft B to the desired level. A singleimpulse. then transmitted over the rotary trunk-line conductor 2 results in the energizing of the so-called rotary relay P and in the consequent energizing of the private magnet K. This private magnet when energized. causes the side switch to. move fromfirst to second osition for the reasons and in the manner a ready described. This switches the magnet'switching wiper I from the vertical magnet to the rotary magnet J and (puts the latterin condition to be energize when the calling subscriber again energizes the vertical relay 0. It will also be seen that the movement of the side switch from first to second position causes the private side-switch wiper- Z to establish open connecti on between the private-shaft wiper b and the release-magnet I through the medium' of the normally open switch-springs.

k. The impulse or impulses then again transmitted over the vertical line conductor energize the vertical relay, and the latter then brings about the energizing of the rotary magnet J, causing the latter to rotate the shaft B in a step-.by-step manner and as many tiniesas there are impulses transmitted through the vertical line-relay. This causes the shaft and its line and private wipers to rotate in such manner as to bring cuit.

the said Wipers to the desired position that -is, into position where they can engage the bank-contacts corresponding to the line .of.

includes the two line-relays O and P, while the other bridge includes the so-called back release-relays M. The calling subscriber,

then energizes the ringer-relay N in the usual manner and over a circuit including the sideswitch wiper l the switch-springs k", and the line-relay contacts,- which are closed together by the energizing of the line-relay O y when the called subscriber throws current on this side of the circuit for the purpose of initiating the ringing of the called subscribers bell. The energizing of the ringerrelay opens the line-circuit and bridges the ringing- ,generator 5 across that part of the circuit extending to the called-subscribers station. However, should the called-subscribersline be found busy the circuit completed from ground through the private-bank contact of the called-subscribers line and through the private wiper b through the private sideswitch wiper l-, it being remembered that the side switch is still in second position, through the switch-springs is, through the releasema net I, and thence to the non-groundedpole oft ebattery automatically brings about arelease and restoration of the connector to its normal position, it' being also remembered that the springsk will-be brought together by the ca ling subscriber as soon as the rotary line-relay P is energized for the last time m" an attem t to bring the side switch from second to tiird position. Then when the calling subscriber attempts to ring the bell at the called-subscribers station the single impulse employed for this purpose only-en' ergizes the veritca'l line-relay O, and thereby only accomplishes a single actuation of the switch-shaft. in a vertical direction. This, however, is sufficient to bring the normally open switch-springs b and b together'and I to thereby connect a busy-signal machine of any suitable construction with the rotary line side-switch wiper l", and thence through the ringer-relay contacts 6 and 7 with the rotary line conductor 2, the latter at this time being in communication with the calling-subscribers equipment. Through the said equi ment connection is then completed with t e It will be seen that one of said bridges vertical line conductor Z, through the vertical relay 0, with the leadto the non-grounded terminal of battery, and thence with the other terminal of the busy-machine. In this way if the selected bank-contacts are found busy the final energizing of the private magnet simply efiects a release of the connector, and the calling subscriber in then attempting to ring the called subscriber will do nothing more than close the connections necessary for giving the busy-Si nal.' Itwillbe understood, of course, that t e battery 8 is referably grounded at 9 andis suitable for urnishing current to the line-circuits for energizing the line-relays and to the internal circuits for energizing the different magnets of the connector. This in general is the operation of the connector when wired or employed in a circuit arrangement of the character shown; but it is obvious, as previously stated, that the wiring and the circuit arrangement can be varied and changed in accordance with the conditions and requirements of different situations and without departing from the spirit of our invention.

With further reference to the release-magnet, it will be seen that the same is mounted upon a bracket, which al'so'carries the re lease-armature and its retracting-spring and also the flexible arm or spring-catch for normally holding the double dog out of engagement with the ratchet-teeth on the shaft. In this way the release-magnet, its armature, and the said spring-catch, together with the retracting-spring for the armature, can all be readily removed as a unit from the connector. Furthermore, the screw t can by inserting it through a slot in the spring be employed as the means whereby the spring canadjusted or moved on its support for the purpose of varying or changing the spring tension.

With further respect to the operation of the connector it will be seen that the arrangement is such that a release of the connector after the subscribers have finished their conversation can be brought about by the calling subscriber by simply energizing both of the line-relays through the medium of any suitable means, and incase the calling subscriber fails to make such a release the called subscriber can then release the connector by energizing the back release-relays M. The circuit arrangement shown is, it will be seen, of such character that either method of releasing may be carried out in the usual and wellunderstood manner. In any event, however, we employ the novel and advantageous feature of releasin the connector immediately upon the energizing of the release-magnet, rather than upon the deenergizing of such magnet. In this way the connector will release instantly and without waiting for the circuit of the release-magnet to be opened.

In Fig. 51 some of the mechanical parts are other figures of the drawings, inasmuch as this figure is diagrammatic and merely for the purpose of showing the circuits and illustrating the 0 erations. For'example, in Fig. 51 only two anksof contacts are shownthat is, all of the line-contacts are shown in one bank, rather than in two-banks, as previouslyd'eseribed and illustrated. It'will be readily understood, however, that the mechanical construction ispreferabIyof the character shown in Figs. -1 to 50, inclusive, andas previously described. I

' As shown, the difi'erent relays are mounted u on the body-frame of'the switching-mac e, and when thus employed they consti tute a part of the connector; but it isfobvious that these relays may be located on any suit-- able support. 7 r

The purpose of the spring-switch which is operated by the rivate magnet and which serves to retract t e armature ofs'aid magnet is as follows: The upper or normally closed switch-springs are opened to prevent the energi zing of the vertical magnet or the rota magnet or the ringer-relay when the release 1s made by the calling subscriber, according to the condition of the comiector and the posi tion of the side switch. In other words, these u per and normally closed s rings are ada ted to control the circuits .0 the vertica and rotary magnets and the ringer-relay and to prevent. energization thereof when the calling subscriber makes arelease, according to how far the calling op'erationhas progressed. The lower or normall springs are adapted to close when't e 'connector releases automatically.tha.t is, when the connectoris employed in an attempt to callabusysubscribers ine. Inothe'r words, the said lower or normally open switch-springs control the circuit of the release-magnet and a shaft wiper witha are therefore desirably closed together when it becomes necessary to obtain an automatic release. The busy release-circuit brought ement of the privatearged or busy rivatebank contact extends from ground in the manner explained, through the said normally open switch-springs, and through the releasee magnet and directly to the non-grounded pole of the battery. The releaseeeircuit rought about b the releasing of the connector by the cal ing subscriber, in the usual about by the enga c manner, extends from the non-groundedpole .of the battery, through the release-magnet,

through the line-relay springs 10, which are brought together by the simultaneous en ergizing of the line-relays, and thence out' over the release trunk line conductor II to some point whereit can pass to ground and thence back to the grounded pole ofthe battery.

It will be understood, of course, that in the shaft against back movement during op systems, comprising arotatable and en wise-- movable switch-shaft having vertical? and rotary ratchet-teeth, an electromagneticall -actuate d pawl for engaging the vertica ratchet-teeth and thereby giving the said shaft a step-by-step vertical movement,

adapted to engage said 'vert'icalr and roltary ratchet-teeth to prevent backmove ment ofthe shaft during its operation, a release-magnet, and a releasearmature adapted when-attracted by the said magnettopositively draw the said double dog out of engagement with said ratchet-teeth, and to .an electromagnetically-actuated pawl foren- I gaging the said (rotaryratcheteteetli? and thereby giving the said shaft a 'step-by-step rotary motion, a. double dog having "portions thereby allowthe switch-shaft'to' restore itself to its normal position, and means for catching and holding the sa1d double dog in its normalposition out 'of engagement with the'said ratchet-teeth.

2. 'A connec'tor for automatic tele hone systems, comprising an electromagnetic ally actuated switch-shaft, switch-contacts opera'ted thereby, a locking devicefor holding its operation,- a releasemagnet, and a release-armature adapted when attracted to -drawTth'e said locking device into osition to release-the said shaft, said locking evice consistin of a double dog adapted when release from its normal position to revent both endwise and rotary motion of t e shaft in a backward direction; andzth'ere bemg a line-circuit provided with a pair of bridged line relays having normally open contacts which control the energizing of sa1d release- "magnet and which can only be closed together by the simultaneous energization of said relays.

systems, comprising electromagnetical y-opsired connection, a locking device for holding the switching means against back movement,

a release-magnet, and a releaserarma 3, connectorf for 'automatic'tele honev crated switching means for making the detu're adaptedwhen attracted. by the said magnet to move the said locking device into position to release the said switching means and thereby'permit the'latter to resume its normal condition, said locking device conbothendwise and rotary motion of the switching means in a backward direction and there sistin of a double dog adapted when release from its normal position to prevent gether by the simultaneous energization of said relays. i 4. Aconneetor" for automatic telephone systems, comprising switch-contacts, a shaft by which the contacts are operated, step-bystep mechanism for operating said shaft, means for locking the switch-contacts in different positions, so as to temporarily maintain any one of a number of possible connections, a release-magnet, a releasesarmature adapted when attracted by said magnet to withdraw said locking means and thereby release the means for operating the switchcontacts, and spring means for automatically restoring the switch-contacts to normal pos1- tion upon the energizingof said magnet, said locking means consisting of a double dog adapted when released from its normal position to prevent both endwise and rotary motion of the shaft in a backward direction and there being a line-circuit provided with a pair of bridged line-relays having normally open contacts which control the energizing of said release-magnet and which can only be closed together by the simultaneous energization of said relays. I

5. A connector for automatic telephone systems, comprising switching contacts, means for oper ating said contacts, locking means for maintaining the switching-contacts in any desired position so as to temporarily establish any one of a number of possible connections, a release-magnet, a release-armature hung at its upper end and having its lower end adapted to engage the said locking means, sprin means for keeping the said armature normal y retracted, means for keeping said locking means normally retracted, and for automaticallyreleasing said locking means upon starting the operation of said switching-contacts, the said armature being adapted when attracted by the magnet to withdraw the said locking means and thereby eflect a release of the switchingcontacts, and automatic means for restoring the released switching-contacts to normal position.

6. A connector for automatic telephone systems, comprising switching-contacts and means for operating the same, a locking device for insuring against back movement of the contacts during their operation, a release-magnet, a flat spring having one end portion suitably mounted and held in a horizontal position, a release-armature having its up er end provided with engaging portions y which the armature is hung upon the opposite edge portions of the horizontal portion of the spring, said spring having a couple of side portions adapted to engage the upper end of the armature at points above the aXis about which the latter swings, and the spring also having a lower portion adapted to act as a stop to limit the movement of the armature away from the magnet, said armature being adapted when attracted by the magnet to Withdraw the said locking device and thereby effect a release of the switchingeontacts, togethenwith automatic means for restoring the released switching-contacts to normal position.

7. A connector for automatic telephone systems, comprising switching-contacts, and suitable means for operating the same, a bracket having a vertically-disposed lower ortion and an upper horizontal portion, a ocking device for preventing back movement of the'sWitching-contacts during their operation, a release-magnet having one end suitably secured to the vertical portion of said bracket, that spring secured to the uper horizontal portion of the bracket, a reease-armature hung on said spring and normally held away from the magnet by the same, said armature being adapted when attracted to withdraw the said locking device and thereby effect a release of the switching contacts, and spring means for automatically restoring the released switching-contacts to normal position.

8. A connector for automatic telephone systems, comprising switching-contacts and means for operating the same, a locking device for preventing back movement of" the switching-contacts during their operation, a spring-catch for normally holdingsaid locking device in an inoperative condition, means for automatically disengaging said catch and releasing the said locking device upon starting the operation of the stitching-contaets, a release-magnet, and a release-armatine adapted when attracted :to withdraw said locking device and thereby efl'ect a release of the switching-contacts, together with spring means for automatically restoring the released switching-contacts to normal position.

9. A connector for automatic telephone systems, comprising switching contacts mounted on the shaft, a side switch,- a locking device for preventing back movement of the shaft during the operation of the eonneetor, means for normally holding said locking device in an inoperative condition, means for perating the said shaft and the side switch, automatic means for releasing the said locking device upon starting the operation of the connector, :1 "release-magnet, a releasearm ature adapted when att racted by said magnet to withdraw the said locking device, and suitable connections whereby the energizing of said magnet is also accompanied by arestorationof said side switch" together with a line-circuit, and a pair of linerela vs bridged across said line-circuit, said line-relays being provided with a pair of normally separated switch-contacts which control lho energizing of the release-magnet andliwhich can only be closed togetherrby the energizing of both relays;

, means for operating said shaft, a lockin de-' 10. 'A connector, for at/tomatic .telephone systems, comprising 'a switch-shaft,

vice for preventing back movement oi the shaft during its operation, a spring-catch for normally holding said locking device in an inoperative position, a release-magnet, means for automatically throwing said locking device into action upon starting the oper-l of the atlon of the connector, a release-ar'm'a:

ture adapted when attracted by said mag? net to withdraw said-lockingdevice, a side switch, and a connection between said side switch andiocking device whereby the en-' ergizing of said magnet and the attraction of said armature is necessarily. accom a restoration of both the said sha t said side switch. 7 v

11. A connector for automatic telephone systems, comprising a switch-shaft provided with vertical and rotary anied by ratchet-teeth, a double dog having portions adapted to engage both the vertical and rotary movement of the shaft during its operation, a stationary support, a s ringcatch having one end suitably secured to saidsupport'and its other end adapted to engage said double dog and thereby normally hold the latter in an inoperative condition, electromagnetically-actuated means for automatically disengaging said catch and thereby releasing the said double dog upon starting the operation connector, and electroma netic'allyoperated means for restoring said ouble dog operation, a catch for 'tomatically returning the re upon starting the operation of toits normal position and thereby releasing means for authe shaft, together with spri I eased shaft to its normal position. .12. A connector for automatic telephone systems, comprising switching-contacts and means for operating the same, a locking device for preventing back movement of the switching-contacts during their normally holding the saidlocking device in an ino erative condition, means for automatica disengaging said catch andreleasing the lbckingdevice the con- .nector, and electromagneticallyoperated means for positively withdrawing said locking device and moving it baclg into its normal position in engagement with said catch. 13. A connector for automatic telephone systems, comprising a rotatable and endwise-movable switch-shaft, locking means for preventing back movement of the shaftduring its operation, a-device for normally maintaining said locking means in an inopen ative condition, means for automatically throwing the said locking means into operation upon starting the operation of the conand theratchet teeth to prevent back nector, a side switch, a private magnet. having an armature constituting the .sole means for electromagnetically setting the side switch in motion,.a release-magnet,

a release-armature adapted when attracted to restore the said locking meansto normal condition and thereby effect a release of the switch-shaft, suitable connections whereby the energizing of'said release-magnet is also accompanied by a restoration of said side switch to its normal position, and spring means for restoring the released shaft to its normal position.

7 14. A connector for automatic telephone systems, comprising switching-contacts and means for operating the same, normally inoperative-locking means adapted to prevent back movement of the-switchingcontacts during the operationof the 'connector, and after the said contacts have been moved to the desired position, a side switch, a private magnet provided with temporarily maintain any one of a number of possible connections, a release-magnet, a fiat spring having its upper horizontalpon tion adjustably mounted, a release-armatu-re having its upper end removably hung upon the edges of the saidhorizontal portion o the spring, said spring having upwardlyprojecting side portions adapted to engage the upper end portions of the armature at points above the axis about which the latter I tilts or swings, and the spring also having a lower end portion adapted to act as a stop to limit the movement of the armature away from the magnet, said armature being thereby adapted when attracted to restore the said locking means to normal condition and thus eflect a release of the switching means, together with sprin means for restoring the, switching means w en released to normal positi'on.

16. A connector for automatic telephone systems, comprising a rotatable and endwise-movable switch-shaft having verti'cal and rotary ratchet-teeth, an electromagnetically-actuated pawl for engaging the vertical ratchetteeth and. thereby giving the said shaft a step-by-step vertical movement, an electromagnetically-actuated pawl'fo'r engaging the said rotary ratchet-' teeth and thereby giving the said shaft a step-by-step rotary motion, a double dog having portions adapted to engage said vertical and rotary ratchet-teeth to prevent back movement of the shaft during its operation, a release-magnet, and a release-armature adapted when attracted by the said magnet to positively draw the said double dog out of engagement with said ratchetteeth, and to thereby allow the switch-shaft to restore itself to its normal position, and means for catching and holding the said double dog in its normal position out of engagement with the said ratchet-teeth, together with a line-circuit, the connector as a Whole comprising also a pair of line-relays bridged across the line-circuit, means whereby the relays are controllable by a calling subscriber and operative to cause the connector to establish connectionwith the called-subscribers line, and means Whereby said relays are also controllable by a calling subscriber and operative to eiiect the release and restoration of the connector to normal position.

17. A connector for automatic telephone systems, comprising an electromagnetically-actuated switch-shaft, switch-contacts operated thereby, a locking device for holding the shaft against back movement during its operation, a release-magnet, and a release-armature adapted when attracted to draw the said locking device into position to release the said shaft, together with a line-circuit, the connector as a whole comprising also a pair of line-relays bridged across the line-circuit, means whereby the same are controllable by a calling subscriber and operative to cause the connector to establish connection with the called-subscribers line, and means whereby said relays are also controllable by a calling subscriber and operative to effect the release and restoration of they connector to normal position. v

18. A connector for automatic telephone systems, comprising electromagnetically-operated switching means for makingthe desired connection, a locking device for holding the switching means against back movement, a relcasamagnet, and a re lease-armature adapted when attracted by the said magnet to move the said locking device into position to release the said switching means and thereby permit the latter to resume its normal condition, together with a line-circuit, the connector as a whole comprising also a. pair of line-relays bridged across the line-circuit, means whereby the same are controllable by a calling subscriber and operative to cause the connector to establish connection with the called-subscribers line, and means whereby said relays are also controllable by a callin and operative to eilect the releas 4,; 0 iuosciibei saving 1ts upper end provided with engagin e and res- 1 portions by which the toration of the tion.

19. A connector for automatic teleplionc systems, comprising switch-contacts, step-by-step mechanism for operating said contacts, means for locking the switch-contacts in different positions so as to temporarily maintain any one of a number of possible connections, a "release-magnet," a release-armature adapted when attracted by said magnet to withdraw said locking means and thereby release the means for operating the switch-contacts, and spring means for automatically restoring the switch-contacts to normal positionupon the energizing of said magnet, together with a line-circuit, the connector as a whole comprising also a pair of connector to normal posiline-relays bridged across the line-circuit,

means whereby the same are controllable by a calling subscriber and opcrativc to cause the connector to establish connection with the called-subscribei"sline, and means whereby said relays are also controllable by a calling subscriber and operative to client the release and restoration of the connector to normal position.

20. A connector for automatic telephone systems, comprising switching-contacts, means for operating said contacts, locking means for maintaining the switching-co11- tacts in any desired position so as to temporarily establish any one of a number of possible connections, a release-magnet, a release-armature hung at its upper end and having its lower end adapted to engage the said locking means, spring means for keeping the said armature normally retracted, means for keeping said locking means normally rctracted, and for automatically releasing said locking means upon starting the operation of said switching-contacts, the said arnniturc being adapted when attracted by the magnet to withdraw the said locking means and thereby efiect a release of the switching-contacts, and automatic means for restoring the released switching-centsctsto normal position, the connector as a whole comprising also a pair of line relays and means when-by the same are controllable by a calling subscriber and operative to cause the "conncctoi" to establish connection with the oiled subscribcrs line, and means whereby said relays are also controllable by a calling subscriber and operative to client the release and restoration of the connector to nornnil position.

21. A connector for automatic telephone systems, z 'nnprii-iing swili-hing-wm tacts and means for operating the ame, a locking device for insuring :igaii i barlr movement of the contnc! a during their opera-- rion, a release-magnet a flat spring having one end portion suitably mounted and hold in a horizontal position, :1 rclons arniature :zirmaturc is hung upon

Images