US947340A

US947340A - Telephone switch apparatus.

Info

Publication number: US947340A
Application number: US44?1??0?A
Authority: US
Inventors: Stanislaw A Koltonski
Original assignee: ELECTRO MECHANICAL WORKS
Current assignee: ELECTRO MECHANICAL WORKS
Publication date: 1910-01-25
Anticipated expiration: 1927-01-25

Description

UNITED STA PATENT OFFICE.

s'ransuw A. X OLTONIRI, OI BOITON, MASSACHUSETTS. A hSTGNOB TO ELECTED 1 manual: WORKS. OI INTO], IASIACHUBETT8.A CORPORATION OF MAINE.

'rnarnon UWITOH arrana'rus.

cacao.

v lssstssattsa it Letters Patent. Application lied August ls. "a., lertal In. 4 48.188.

lntcntcd Jun. 2-1. mm.

7b all whom it may 'eoncem:

lie it known that'I, Srasmnaw A. Konroneur, a subject of the Czar of Russia, and

Switch A paratns, of which the following is a s i tion.

This invention relates to telephone switch apparatus for use in what is commonly known as a private branch exchange and is for certain im rovements u :rparstue of the general aracter of t at ascribed in Letters Patent of the United States No. 846 479 issued to me March 12, 1907.

due of the objects of mg invention is to provide means whereby e trunk 'line or cflitrlailelsxciis circutt will bedautgmatisa y c irrespective an in epen ently of the operation of the switching devices controllingpr operating the branch or intercommunicating circuits, thus overcoming the objection common to i ments 0! this t heretofore used, that unlethe attendan at the central inatrn t I of the branch exchange holds the trunk ine circuit closed by manually depressing the plunfirr of the trunk line circuit and olding it t epressed while connecting or calling one of he branch hnea, the operation of the-branch line switching mechanism releaeesthe trunk lme switching mechanism and breaks the trunk line circuit.

Another object of my invention is to provide a separable twoart frame for the switch ap ratus. one 0 which parts carries the switc ing devices and the means for holdin them in operative position, and the other 0 which part carries the circuit contacts and circuit connections. the coliperatmg parts upon t'hc two scct ions bcing so arranged as to come into their proper relationahi when the two sections arc placed togct er.

further objcct of my invention is to aggrc te all of the contacts and circuit conncct one for cat-h branch station circuit in scpaihte groups cach upon a sin le yoke or bracket which mav be attachct to or detarhcd from tho ramc as a separate and complete unit.

further object 'of my invcnt-ion is to provide the rows or banks of circuit springs tit-contacts with lugs projecting outwardly 'thcrefrom at. either side of the instrument so that. they arc readily ncccssiblc for the at tachmcnt or dctachnu-nt of the bus bars.

Other features ot novchy and im rovcment will be hcrcinat'ter dcscri and pointed out in the claims.

.In the accompanying drawings which illustrate certain embodnncnts of my invcntion,Figure 1 is a front elevation of an apparatns embodying the invcntion with the cover removed; Fig. 2Vis a cros section on line 2-2 of Fig. I viewed from below; Fig. 8 is a side elevation. partly in section, on finch-4i of Fig. 1; Fig. 4 is a plan view of the latchqblates for controlling the switch ieratmg devices; Fig. 5 is a side elevation o the latch-plates showing two of the plunrs in normal position; Fig. 8 is an enrged perspective view of one of the unit groups of ring contact switches showing also amodi form of line connection devices; Fig. 7 is a side elevation of one of said unit groups showing said modified form of line conncction completed; Fi 8 is a detail showing in side view a sin a latchlate which may be used in place 0 a plural I of latch-plates by cmploving a longer catch projection on the trunlr hne lunger than those on the plangcrs for the ranch or intercomn'mnicating circuits; and Fig. 9 rcp resents diagrammatically the wiring or circuit conuwtions bctwccn three stations providcd with my improved switching instrunwutsJ which is a sufiicient number for the pn rose of illustration.

en in use the instrument as a whole is placed in a vcrtical position as shown in Fig. Lwith the mciver-hmk levcr at the top, and one such instrument or 'apparatus is cplrovided at cacb station of the branch ea ange The apparatus consists of a, base 1 upon which thc instrumcnt is mounted. A cover or box 2 incloscs and protects the instrument. The instrument proper oontaincd therein consists of a base plste 3 to which a series of groups of circuit springs or contucts' is sccured in a row along each cdgc. One or more of these groups are to bc cmploycd for trunk lines or main cxchangc circuits and thc others for the branch or intcrcommuuicating circuits. As illustrated in the drawinus. two of said groups 4" ntc employcd for trunk linc circuits and thc othcrs 4' for the branch circuits. 'lhcrcls also employed an additional unit or group ltiU .4 which includes contacts and connections for what ma be termed a non-interfering circuit by it rich all other stations are excluded from the at sling or home station or from euttmF into a circuit connected with a trunk me. The base plate 8 is secured to cross bars 5 by which it is fastened to the base 1.

Readily separable from the base plate 8 and the parts carried thereb is a frame which consists of an inner p ate 6 and an outer plate 7 connected by 8. Two

rows of plungera of which 9 9, are employed to operate the trunk line circuits, an

lates

14, 15 and 16. he ends of the middle tch-plate 15 are ided in was 18 in the posts 8. The ates 14 an 16 are suprted as herein'a terdescribed. The plate 4 serves as a latch for holding the trunk line plungers 0 in their depressed pocition, and the plate 16 as a latch io hold the branch line luugers 10 m their depressed position to'c one the talking circuits. For this nrpoee in or projections are pro? vided upon sai plates adapted to cooperate with catches on said plungcrs as will be hereinafter more particularl dcacriimd. To rovidc free action thereof tiic plates 14 an 10 are hun at thcir cnda upon a pair of links 17, euci link pivoted at one en to the latch plate and at the other end to the frame of the machine. Between the plates 14 and 16 lies the plate which is operated by the de reseion of any plunger to cut out armopen t e home Cll'tltll of the calling sta- Escli plunger or switching device in provided with a member consisting of a rail 20 ofnon-oonducting material mounted on a stud 19. The outer ends of the rolls 20 upon the branch line plungcrs 10, are of 'smaller diameter than the inner ends for the purpose hereinafter described. When the two sectlona of the frame. that containing the plunfers and latch-plates, and that oon tainiu tic iroops of contact springs, are placer t1 her in their proper ition, the ama er portions of the rol 20 pass between the upper ends of the a ring contacts of the tal ing circuit, an .the larger portions of the rolls cuter between the aprmgcontactsot the li ie circuits, but in this position, which is their normal position none of the circuits controlled by said cameo spring contacts are cloned. The closing of acid switches in accompliahcd by the depresaion oi oaid plungera as hereinafter duscribcd.

The Imrt of the frame comprising the inner p utc 6 and outer late 7 and connecting posts 8 carrying the plungcrs, latchplateo, receiver-hook lever and their amociatcd partn. is constructed so as to be readily attached to or dctachrd from the plate 3 which carries the contact unite; andto facilitate and insure the accurate alincment of the two parts 01 the frame so as to bring the coectmg mcmiiers into their roper relation two or more dowel pins 1 are employed secured to cross bars 5, which pins paaa through pro )crly located holes in plate 0. Should it at desired to remove the plate 7 for any put-pace, this may he emomphshcd by removing the screws at the tops off the posts 8 which hold said late, in which case the plungers may be heiii in their position by the inner plate ti, by depres in' each and passing a pin or stop through t to perforation l m the lower end of each plunger. When a trunk line plunger 0 in tlepwneud its roll 20 will s read the airing contact members I" and causing; them to moire contact respectivciy with I: and 1') than nineing; the trunk line circuit. To hold the plunger 9 deresocd it is provided on its ower side wit a beveled tooth 22 which enga s a projection 22" on latch plate 14. In or or to call one of the intcreummunicntin stations and to conncct.it with the trunfi line, the attendant then depresses one of the plnngcrs 10 appropriate to the desired station. The deprcsaion of the plunger 10 causes thc roli 20 at its nmallcr diameter to spread the npriruzs c' and c causing them to make contact respectively with the talking circuit springs c' and 0, while they are in their operative position. By depressing the plunger 10 to its full extcnt, the roll 20 at Ill-l larger diamctcl' will bear upon the inwardly projecting wings in of the contact aprin c and c apt-coding aaid upringa outward y againnt springs c and a respectively, thue cloning the 'nignnling circuit of no atation being called. lly relieving pressure on plunger 10, plunger 10 mturns-mlllicicntly to again opcn the niggnaliug circuit and close the talking circuit. the catch or tooth 22 which engages latch-pinto ltl holding the talking circuit ultmul. 'l'hc lll'nln'lt .ol' intcrcommunicating circuit thuu cluacd will remuin clueed until unotlu-r plunger I0 is dcprcuncd, whereupon thc tooth :29 of such. plunger will more lltt' lntcll-plniu Hi and unntch the prcviously tlcprcs cd plunger 10 allowinc it to return to normal position undcl' the inilucucc of spring ll.- lhc trunk lino plun or will remain in dc )rcsswd position unti another trunk line p on cr is depreeccd no as to move the latch-p ate it to at one end with a post 28' secured releu-e it. or until the telephone receiver hook releul-eit uhereinafter set forth.

' tin the aide of eaeh plunger ahank oppoaite to the tooth '12! is u bevel rum surlacc .4 whit-h bear:- agniust a projection on plate I! when the plunger is depletes-d moving the plate I.- upward and thereby moving it )wnrd a small iuaulnting roll secured to p ate it: by atud :25. This roll pro'ects between contact :1 rings and n of t ie group 4". The upwim nuwemeut of the roll breaks the contact between the circuit springs a and a and bet ween u and tr and thus opens the home eireuit aml prevents all other stattons from etttting into that station. This so-ealled home eireuit is kept open by said cum surfaee ao long an any one of the plungrra is held in depremed poaitlon and 2H rhaa-d again only when all of the pluugers are returned to normal ition.

From the f ring it will be seen that the latch-plate holding the trunk line lunger or )lungers 9 is independent of an not atl'eet by the operation of any of the other switching devices but will hold the trunk line rloaed notwithstanding the de- Emit)" of the plungera controlling the ranch circuits.

Springs 28 under tension are connected to each "of the outer latch-plates, and at the other end to the 28 second to the middle latch-plate t'i aml extending through alota in the two outer latch-plates. These Springs normally tend to urge the platen respectively toward their operative position.

In order to restore all of the switching devices to normal position after a call, I provide means whereby the depresaton of the receiver-limit lever by hanging the receiver thereon releases all the p ungera both of the trunk line and of the branch lines which are then in depreiated ptatition. This restores all of the circuits to normal condition. This means eonaitits of a dog 90 pivoted at 97 upon the latch-plate In and told in operative position a spring 28 (see Fig. One arm of lit ll dog is provuled with a notch against which n lateral extension 80 of a supplemental lever 81 hears. The supplemeuta lever til is pivoted to the bracket it at 32 and carries a atnd 83 pmjeeting beneath the receiverhook lever II. The stud 33 carries thereon a roll 34 against whit-h the river-hook lever ll bears and also carries a bearing roll of insulating material, it! which aervea aa a bearing to act upon the contacts of group 4' to open nml close the telephone eirentt when the receiver is lnmg up or taken down. Thedog 20 in aim provided with a curved arm it which extends over an adjustable eeeentrie atop 37 seenrml to bracket ll in such position that when the dog 26 is depreaeed by the action of the supplemental lever 31. which is moved by the downward swing of the tele ihone receiver-limit lever ll. t to arm 86 wi l he brought into contact with the eccentric stop 37 and will cause the dog 26 to tilt" upon "'4 \ivot 21' until the lateral projection of i to lever :H is disengagts from the notch 29 allowing the dog and the aliding latch-platen controlled thereby to return to normal position. the pmjection 80 panning beta-ecu tlie arms 26 a 80 of the dog. liy turning the eccentric 87 upon its supporting arm the time when the dog may be released from engagement with the pro'action 80 can be varied and regulated. 'hen the plate to la depreleledby the operation of the dog an above deteribed. it releases the plungera controlling the tutu-communicating circuits. The ptn 88 then will engage the plate 14 deprenung the same thereby releaaing the trunk hangers; thus all of the plunger-a held by t e latch-plates become released. The late 15 which is held in elevated positton y the cam surfaces 24, will be simultaneously released with the release of the plunger-s and all the circuits will be restored olnntzmag copditiotln- I h ea 0 em 0 m 'arate ate plate for holding tile trim line plungers m their depressed position. the trunk line and the branch line plungera may be all held by a single plate and at the aame tune provision made so that the operation of the branch plungera will not release the trunk line plungera. Thiais accomplished by the construction shown in Fig. 7 wherein the catch tooth 22' of the trunk line plunger 9 as made longer than the tooth 92 of the branch pluuger10.tn which case after plunger 9 has been d ao that Ill tooth 2? in MM by latch late 16. the depresaron of any 0 the pangera 10 for the branch circuita willmt release the tooth 22" because of its ter length. The latch plate may he mat a to operate properly by regulating the strength of the moring 98 andythe springa 11 which respectively are urging the latch-plate and the nlungera to their normal poaitmna.

In Fig. 0 there is illustrated a grou or unit of contact apringa assembled and Id as a single unit complete in itself in a yoke or bracket 80 which may be readily attached to or detached from the. plate 8 for the purof repair or reneu'a by acrewa through toles without disturbing other parts of the ap uiratua'with the exception of unsoldering the bun bar eonncctiona preaentiy to be described. In order to prevent accidental contact between any two of the springs of the several groups. stepped atopa .41 made of insulating material may be insorted between the springs and for the purpoae of aeenrutely loenting trlt'h bracket 30 with refer-nee to the edge oi plate 1!, proans I waif: 3 12x521.

"I, t h I s o t e a aratus.

jectiona 49 are formed upon tbbottom of each bracket to engage the edge of plate 8. The contact prings are Iproperly insulated from each other as usna Proiocting outwardly from each spring of tho talltin and ringing circuits is a lug to which the us-bar is secured. These lugs arc arran l in series. ()ne series of In 44 upon t corresponding contacts of he 1 several groups are preferably arranged in the same vertical plane. Another series of lugs 4a are upon their corresponding contacts of the several groups and are arranged in snother. plane. Another series of lugs on still other corresponding contacts are in another plane, and a fourth series of in a s7 arearranged nlpon still other corresponding contacts In a ourth plane. The bus bars 50 may then be soldered or otherwise secured to the several series of lugs and run in a strai in line without interfering one with anot er. In order that all the lugs and bus bar connections may be readily accessible for inspection and repair by simply removing the cover from the apparatus, it will be observed that all of said lugs project outwardly from the spring contacts at either side of the ap sratua. Heretofore it has been the raet cc to arrange bus bars in various ot ier locations more or less covered and obscured by portions of the apparatus so that they have been accessible for repair 0 by removing or dismantling certain e termin 51 (see Fig. 2) are provided for the several contacts. In Fi 6 and 8 I have shown a modified form 0 line terminal wherein an extension 52 from the contact springs projects outward from the base in front. of the contacts and terminates 'in a U-sba piece 53. A metal stri 54 secured wit iin said U-shaped piece asy a screw as is fastened to the inaulatin stri 56 upon the base 1, to the lower end 0 whici strips I54 the line wires are connected. By loosening the screws as when any one of the unit groups 4', 4" etc. is removed, this U- ahapet p ece as will'be removed with it. This construction afl'ords a form of line connection which need not be disconnected from the terminals-should it be nscenary to springs from the housing or box.

The wiring :.of the private branch telephone svstem having three stations provided with t w improved switch apparatus is shown dingrammuticnllv in big. 9. he three branch stations. hosul. 2 and 3, are counts-ted by two bell circuit wires 80 and til. and six tclcphonc circuit wires 62 to 07 inclusive. ncctcd with one of the poles of the telephone buttery Tl by wires 72,-78 and 74, rcs wctivcly. each of said wires including the usual impedance coil (5, while wires,68, 65 and (36 remove the entire mechanism and circuit' and 69. respectively, with the oppos The wires 62. 64 and 07 are conpole of battery 71 iy wires 76, 77 and 78. re-

spectively each of the la t mentioned wires including also an impedance coil 79. The wires 60 and 61 are connected by wires 168 its es of a bell battery 70. At each station a l of the contacts 0, of etc. are connected by a single conductor or wire 80 with the wire 60 leading to one pole of hell battery 70, while the wire it! that leads to the opposite pole of battery is connected with one terminal of a hell it at each station hv a wire 81. The other terminal of each bell It is connected by a wire 82 with the contact e of its station. The contact c at each station with which a is normally in engagement. is connected by a wire 83 with the contact a of the home switch of its station, and each wire 83 is connected by wires 84 with the contacts'c, d.

etc. of its station and by a wire 85 with the contact I) of the trunk switch of its station. At station No. l the contact a with which contact a is normally in engagement, is connected by a wire 86 with wire 05; at. station No. 2 the contact a is connected by a wire 87 with wire 67; and at station No. 3 said contact a is connected by a wire 88 with wire 68. It will now be seen that the bell circuit for each station includes wire 81, bell B, wire 82. contacts e and a. wire 83, contacts a and a. and wires 86, 87' and 88. At stations Nos. 2 and 3 the switch d, d etc. is the branch switch for calling and controlling communication with station No. 1. and the contacts 4!" of both of these branch switches are connected each by a wire 89 with thewire 64 to which the wire 105 connects contact a of station No. 1. At stations Ros. 1 and 9 the contacts c. 0' etc. is the branch switch for Eli calling and controlling communication with station No. 3, and the contacts c' of these two.

No. 2. The contacts 0. and I! of these twowitches are connected each by a wire ill ith the wire (ill. with which the wire 106 of station No. 2 connects. Assuming now that the operator at station o. 2 or No. :l desires to ring the bell of station No. 1. then be pushes. in. to the linnt of its movement. the

usb button 10 of branch switch (I, (1' etc. of iis station. and as long as he holds this push button in its extreme iuncr )osition n circu'it is com )lctc through he] ll of station No. l. whici is traced as follows: from buttery 70 through wires 0H and (it wire 81 of cameo cs I'tl-t' may by: contacts I! and 1; and thence lhrou 'h \tn cs H). lit) and il back to battery 7". t will now be plain how the operator sure from such push button the bell B at the called station ceases to ring. At each station the contact a of the home switch is connected by a wire 93 withone of the terminals of a transmitter T, the other terminal of which is connected through a wire 94 with the contact 0', said wire 04 including the primary of an induction coil I. The contact a with which contact 4: cooperates is connected by a wire 95 with the wire on. The secondary of the coil 1 is connected by wires 90 and 97 with the receiver R. The contact b of the trunk switch is connected by a wire 98 with the wire 93, while the two middle contacts 6' and b are connected with the trunk line wires tit! and 100 leading to central.

It will now be clear that when the trout: switch button of any station is pushed in and the receiver it removed from its book, a trunk line leading to central is closed, which is traced at the branch station as follows: from wire 99 through contacts 6 and b; wires 85, amt U5 contubts of and wire 94 including the primary of induction coil 1; transmitter '1; wires 93 and 98; and contacts b and b to wire 100. Since the latch-plate 14 for the trunk awitch is entirely indcpendent of the branch switch buttons 10, any one or more of the latter may he depreiaaal after the trunk switch button has been de usual, and those branch cwitch buttons wil be caught and held in their inner 't ons by the latch plate 18; but if the ranch switch buttons have been depre-ed previously to the operation of the trunk awitch button, then when the trunk switch button ia depreaaed the cam 941 of the latter will operate the late 10 so as to return these branch awitci buttons, auto maticall' to normal ition, leaving only the trun line ctinn with the station.

At each branch station the wire 08 is connected wirea 101 with the contacts or, d etc. of t e respective branch awitchca of the station. At station No. 1 the contact d which coogeratea with the-contact d of that switch an at station No. 8 contact a are each connected by a wire 108 with wire 67. At atationa Noa. 1 and 2 the contacts 0 which cooperate with contacta c' of those switches are connected by a wire 102 with the wire 68. At atationa Nos. 2 and 3 the contacts at which cooperate with the contact ll of those switches are connected by wires 104 with the wire iii At station No. 1 the wire 64 is connected by a wire 105 with the contact a" of the home switch of said at.- tion; at utution No. 2 the contact a" of the home switch of that station is connected by a wire 106 with the wire titi. and at hluiiutt .\'o. 3 the contact a of the home switch of that. station is connected by a wire 10? with the wire 03, its explained above the contacts u and u of the home switch of each branch station are normally closed as are also the contacts a? and a of said switch. Also it has heretofore been made clear that the change in the condition of the circuits and switches at the called station is reducod only by the removalof the receiver R from its book in responding to the call which opens switch 0, c, and closes switch e, 0. Therefore, if station Xo. 1 is the called station its pin-i of the primary talking circuit is from wire ti! through wire 86; contacts a, 0'; wires Strand U7; contacts c",

a; wire 94; transmitter '1; wire 93; contacts a, a, and wire 10? to wire 64. That part of the primary talkin circuit at the calling station is ostahlishet by pushing'in the button 10 eorres mnding tothccalled stution, which operation serves to establish said trircuit from either wire U2, (it or tilt, according to which push button 10 is operated through the transmitter of the calling eta tion to wire 63, (5.: or (ii. 'lhus if station No. 2 in calling :iiutimt No. 1 push button at switch Z,Z is depressed and caught by plate It), so that that part of the primary talkin circuit at station No. 2 is from wire tit) witt which wire 86 of station No. 1 connects, through wire 104; contacts d and d of that switch; wire 93; (contacts a and 'a' of the home switch being o icncd at the calling station tht'ottrrjh the tcprteeiion of the push button in caiiing station No. 1) transmitter '1; contacts c,-i:'-',- wires 95 and 83 (contacts a and a of the home switch being opened at the ccllin station through the depression of the past button in calling at tion No. 1), contacts (1 and d of that awitch and wire 89 to wire 64 with which wire 105 of station No. l connects.

ii claim: 7 t

1. .tdelcplmnc switch apparatus for con trolling a p uralit of circuits, of which one or more is a trun line or central exchange circuit, and the others are branch or inter= connnunicatiug circuits, comprising a separate switching device for each circuit tn the system, aml movable retaining means adapted automatically to hold the trunk line or central exchange circuit cloae'd independently of the operation of the switching devices controlling the branch circuits.

2. A 'tele hone switch apparatus for controlling a p uralit of circuits, of which one or more is a trun line or central exchange circuit, and the others are branch or intercouununicating circuits, comprising a sc'puratc switching device for each circuit in the system, means whereby the o ration of any of the switching devices con rolling the hng the branch circuits.

3. A telephone switch apparatus-for co trolling a p uralit of circuits, of which one or more is n trun line or central exchange circuit, and the others are branch or intercommunicnting circuits, com risin a series of switching plungers, one or one circuit, a spring for each plunger normally urging the same toward its elevated or inopsrative' position, and movable retaining means adapted automatically to engage and hold depressed the Inn r or plunger-s controlling the trunk ine circuit irrespective of the operation or the switching plung r-a o! the branch circuits.

4. A tele hone switch apparatus for controlling a p urolit of circuits, of which one or more is a trun line or.central exchange circuit, and the others are branch or intercommunicatin circuits, com irisin a series of switching p ungers, one or eac circuit, a spring for each plunger normally urging the same toward its elcvatcd or inoperative position, means whereby the depression of an) of the branch circuit plun era will release other branch circuit p nngcrs previously depressed, and movable retainin means adapted automatically to engage on hold depressed the plunger or plungers controllin the trunk line circuit or circuitsirrespective of the operation of the pluugcro Offilhi lzrincg: circuitrtl. h f

. so one swi c a arutus or controlling aapi uralit. pp or niore is a trun line or central exchange circuit, and the others are branch or intercomnninicating circuits, com n'ising a separate switching device for each circuit in the system. and menus to hold the trunk line or central exchange circuit closed, irrespective of the operation of li switchcscontrolliug the branch circuits, n lazt'ttt' .or sup rting the receiver, and lllt'ttlh controlled snid lever for ratil nll oi the closed Swilclus to restore all of t to circuits to normal conll. A telephone witch apparatus for controlhng a p uralit of circuits, of which one or more is a trun line or central exchange circuit, and the others are branch or intcrcommunicutin circuits, com wish] a scrics of switching plnizfera, one or can circuit, and means to 01 depressed the plunger or of circuits, of which one.

Mam

plungem controlling the trunk line switch or switches irres tive of the o aeration of the switching iungers of the ranch circuits, a lever or seiiipporting the receiver, and means controll y sai lever for releasing all of the depressed switching plunger-s to restore all of the circuits to normal condition.

7. A tele hone switch apparatus for controlling a p uralit of circuits, of which one or more is a trun line or central exchange circuit, and the others are branch or intercommumcatin circuits, com risin a series of switchin p ungers, one or eac circuit,

,antomatical y operated means to hold depressed the plun rs of the branch circuits, and an automatically operated latch to engage and hold depressed the trunk line plunger or lungers, irres tire of the o eration of t e means em 0 ed to hold elungers of the ranch circuits. 8. A telep one switch apparatus for controlling a. p uralit of circuits, of whit-tibiae or more 18 a trun circuit, and the others are branch or interconnnuuicsting circuits, comprising in series of switching plungers. one for each circuit. n latch-plntc adapted to engage and hohl dcprcnm'tl the plungrrs of the hrnnch circuit. and an imlc ndcnt latchlate uduplctl to engage and mid dcprcsscti the trunk lino plunger or plungcrs irrespective of thc operation of the first lncntioncd lntclrplutc.

9. A tclc )hone switch apparatus for conirolling a piurulitr of cii'tftllls'. of which mic or more is n trun linc or control cxchungo circuit. and the others are branch or iutcrcommunicating ('ilflLits, comprising u scrics of switching plungcrs, one for cnch circuit. n latch-pinto uduptcd to cngngo nlnl hohl depressed the plnngcrs of the branch circuits and on imlcpcmlcnt lntch-plutc mlnpt- ('(l to engage and hold tlcprcmul llit' lrunk line plunger or pluugers' irrcspm-tiro' of thc opcration of the first nicntioucd lutrlhplnlc. and u third lntchilutc controIIc lhy the operation of any p uugcr of the series. the movement of whici plutc opcus a circuit to exclude all othcr'circuits from the one conncctcd with the home station.

it). tclcphonc switch uppurntns for controlling n plurnlitv of circuits. of which one or tllm'ois u trun linc or control exchange circuit. and the others are ln'nnch exchange or intcrmnnuunicnting circuits, coniprisin n .wl'it's oi su-itchingtpluugcrs. one for t'llti circnitru lutcli inln itcil to cugngc uml liultl ilcpicescil tho plungcrs of t'nlu'onch cir' cults. nn-uns \rhcrcl r tlic lit';-l'thltlll of any ouc of Hllltl ln'nuch circuit p ungcr-a l'tlt'liht'.\ any tilltttlwlt'plt'xsml brunch circuit pining-or. ttii liitltpt'mlcttl lulcli :ulu itml t0 cugjnglulnl hold depress-ml thc li'lllH Iinc plnngcr or )lllll crs irrcspcctivc ot tlnlrt'lltlit ll ol'thc run s circuit liilllljfll'w'. :iml u iilil'ti latch line or central exchange ano 1,

t'ttlllltlllt'tl by the opera ion of any plunger in the r 'lltri. the lnot'elttt'llt of whi h open it circuit to exclude all other circuits from the home station.

ll. telephone min-h up mrutm for coutrolling u pluralit of circuits, which one or more, it an Iron line or central exchange circuit..- and the others ure brunch exchange or iutcrmmnntnicating: circuih. comm-hing 11 series of switching plunger one for each circuit, a latch adapted to engage and hold deprwml the nlnngera ot the brunch eirt'tllltt. menus \r n-reby the dc men ion of any one of mid branch circuitpiuntzera releuaw any other tl 'pl't'm'tl brunch circuit plump-r:

un iudo iendeut lutch tltlll llt'tl to engu and l Il hold depresied thc'trun lino plunger or plun cro irrespective of the operation of the ll'flllt'll circuit plungere. and a third latch controlled by the operation oftanv plunger in the neriee. the movement of n'hic 1' opcnn a circuit to exclude all ,otllcr'circnite from the home ntation. and means to operate all of said latches together to release all of acid plun rs and restores" of said switches to nonna condition.

12. A telephone witch apparatus for controlling a pluralitv of circuits. of which one operation of any plunger of the series, the

movement of rich opens. a circuit to exelude all other circuits from the home 'statron, a lever for aupportln the telephone receiver, and means contro ed by said lever for operating all of said latch-plates to release all of said plunge", and restore all of said awitches to normal condition.

18. In a telephone switch apparatus rovided with a aerieh of switching deviceav teld in operative position by one or more latchpl tea, the combination with the telephone receiver-book lever, of a supp emental lever pivoted to the ap ratua and operated [a he receiver-hook ever, a ring controll 7 dog pivotedto one of the etch-plates, and means upon the supplemental lever to enga the dog and move I together yntl the late lates to release all of the switching devices meld by laid latch-platen, when the receiverhook lever is dew-eased 14.In a telep one switch apparatus pro- ..M d with a plurality of circuits and 0. comes 'zceiver-hoo said latch-plates. means operated by the reof au'itching devices therefor held in operutivo poxitiou by u plurality of print; actuated ltlltill-llllllththe combination with the telephone rcccivcr-hmxl: lever, of a nupplemental lever pirated to the tt|l]ltll'tll-llli and operated by the mritel'dnmlt lover. a wiring "controlled dog pivoted to one of the etchplates, Incnlln upon the flnpplonu-ntal lever to engs tl dog and move it together with the late i-plute to which it is pivoted to open the circuits controlled thereby, means on auclrlatch-plato simultaneously to o hereto theother latchlatea to restore the c reuitn controlled there y to their uortnalfixaiition and means to release said dog from can aupilemental lever to. permit all of the lat r-plates to retgrn to their normal posihon after said mtches hav'e'been restored to normal position.

- 15. Ina teleph switch apparatus for ,controlh a' p urn ity of circuits and pr'ovided wit a seriea of switching devices which are lield in operative position by one 7 or more spring actuated latch-plates, u relever, a dog pivoted to one of eetver-hook lever to entrain and depress the do and its latch-plate, and a fixed stop adapted to engage and actuate the pivoted dog to release it from the operation of the receiver-hook lever to permit said latchplates to return to normal ition.

10. In a tele hone nwitc apparatus for controllin a p urality of ctrcultirand provided wit a series of switching devices which are held in operative .pmition by one or more a ring actuated lutch-phitea, a receiver-h lever, a dog pitoted to one of aaid-latch-platen, means operated by. the receiver-hook lever to engage and depm the dog and itn motuniuul a stop adapted to engage and actuate to pivoted dog to release it from the operation of the receiverhool: lever, said stop comprising an adjuateble eccentric whereby t release ma be varied.

17. A telephone awitch apparatus for controlling a plurality of circuits. comprising u readily separable two-purt frame. one of which parts curries the uu'itching devices.

springs normally holding the same in in-.

operative position. and menus to hold them in operative position and to releaae thcm therefrom, am the other of which parts car rica groups of cooperating circuit spring. toget \er with bus bars connecting the some. and means to guide the two parts of the frame when placed together so as to bring the switching devicesinto proper cuiipcrutire relationship or ulineun-ut with thenrerun-tire circuit nprinun. the ill'Hl nu-ntiom-d part being no comtrueted that the relative potutionu of the dericm curried thereby are not diaturbed when the two parts of the frame are separated.

to time of such llli IN. A telephone switch ll] l|ttll'lllllt4 for controlling a plurality of ircuits, comprising a readily separable two part frame, one of,

I said plungers. and the other of whiei iarts lib - contrnlling ii p consists of a base plate having secured t iereon a bank of maps of circuit springs and means separab y to fasten said two parts together with the members carried thereby in cooperative relationship.

19. A telephone switch apparatus for controlling a plurality of circuits comprising a readily separable two part rame. one of which frame-parts carries the switching dcvices. the springs normally holding the uwitchin llitl springs retained between and abutting against said switching devices and said frame-part. and the means to hold said switching devices in operative ition and to release them therefrom. it frame-part and said devices carried in-why being wholly self contained whereby said deviceswill not be disnnanbered or disturbed when the two parts of the frame are separated, and the other of which frame-parts carries groups of cooperating circuit contacts together with bus bars connecting the same. said two parts and said devices i'especlit'el i' carried therebymaeh being complete in itself and so constructed that each part and the devices carried thereby are not di ineinlwreil or di turbed when the two parts are separated.

20. lml'|tlttllltfJaWiit'll apparatus for controllitig a plurality of circuits. comprising a readily separable two-pait frame. one of which parts consistsof an inner plate and an outer plate provided with guides for the switching pliiugers, said plates connected together by posts, plnngers in said guides carr \'ingcontact springo icrating members, and longitudinally moral) e latch-plates holding depresstal said phingei's, and the other of which parts consists of a base plate having scent-ed thereon a bank or group of circuit contacts. and means to guide the two parts of the frame when placed together so as to bring the switchingdevices into eol'qieratii'e relationship with their respective circuit contacts.

2t. in a trio ihone s\"ilch apparatus for liii'alitv of circuits ainl provided with a series of switching plnngci's. a frame comprising an outer guide plate for said phingeis and ttdmltlllttl inner plate hariiig apertures to gni c the inner ends of said plnngers, the inner ends of said plnngers (lei-ices in inoperative position,- I gage with out character described comprisin adapted to pass through said apertur s, each iiiingeiprov ded with a slion der and held l a spring with the shoulder abutting against said outer guide plate, said outer with means to receive and hold a separable stop to prevent. the plungcrs from being forced out of tlicirinner guiding apertures when the outer guide plate is removed.

22. In a telephone switch apparatus for controlling a p uriility of circuits, in combination, a base having thereon a series of gron s of a win contacts, each group assenib ed an bed in a se ai'ate bracket adapted to be readily attac ed to and detached from said base as'a single unit, and a separable frame carrying a pluralit of switching devices coo crating each with i appropriate group 0' circuit contacts, said brackets lnivin projections ada )tcd to onbase to insure tie accurate positioning of said contacts in relation to said 'switchin devices.

23. In a tee hone switch apparatus for controlling a p urality of circuits, in combination, two parallel. rows of groups of spring circuit contacts, pli ngcrs to operate said circuit eontacts,'the talking and ringing swings of said circuit contacts being provided with lugs, the lugs on the springs of each row being on the outer side of the row and projecting away from the other row, whereby bus-bars connected to said lugs will be situated entirely outside of the rows of iipl'iltgti.

24. In it tele ihone switch apparatus for controlling a p nrality of circuits, in combination. two parallel rows of groups of spring circuit contacts, plun rs to 0 rate said circuit contacts, the talking and ringing sprin gs of said circuit contacts being provide with lugs, the lugs on the s wings of each row being on the outer side 0 the row and projecting away from the other row, and the series of lugs on the corresponding contacts of each group being in alincment itiid in the same plane, and each of such series of tags being in irditfcrcnt plane from any other series, whereby the bus-bars when connected to their respective series of lugs will be'sitnated entirely outside of the rows of springs and in separate tiers.

2 ..A telephone switch apparatus of the in combination a frame, a ilurality of circuit springs and switching plnngcrs, and a spring actuated plate for holding the plungg'ers cicprezised, said plate being supported to swing in a email are in the. frame by links ivotc at one end to the frame and at the at an end to the plate whereby sliding friction is avoided.

lit)

met). A telephone switch a character descrilx'd comprising in combination, a frame, a plurality of circuit springs and switching plungcrs one or more of which controls the trunk line, and the rest of which pparatus of the I able plate vieldiu l v hcl control the branch lines. a spring actuated latch-plate for holding the trunk 'liuc plauger or pluugcrs depressed, and a spring actuated latch-plate for holding the branch line plungers depressed, each of said platcs ing hung at its ends by links pivoted to said frame and to said plate.

27. In a tele hone switch apparatus of the character eacribcd, the combination with tho ilungcr and latch-plate carrying a frame. 0 a laterally extending arm secured. to said frame at the end thereof. com arising the plate I! having the upturned end it 'proridcd with a mental lever 31 pivoted to acid plate c use to said upturned end ll, and a telephone receiver-hook lever pivoted to Hold late ll oppoai e to the pivot of lever M an extending through said alottcd end B','nieans intermediate the supplemental lever and latch plates to release the latter. and means intermediate the sup lt'mcntal lever and the receiver-hook lever w icrebv the depression of the latter operate the armor.

28. la a telephone switch apparatua of the character dem-rila'd. a group of circuit a iringa consisting of a pair of inner springs or the talking circuit. a pair of ontcra irings for the signaling circuit, and a pair 0 intermediate apriiiga for the line circuit. all of said apriuga being normally electrically di ponuccted from one another. and each of Mid line circuit apriugs ha ring an extension or wing ofl'oet from the linc.of the other 8 rings, in combination with a switching; p un .r carrying a stud extending laterally there roni, one portion of thc .-tud adapted to enter bctwccii the talking and force thciu outwardly agniu-t thc liuc circuit springs during the tirat part oi the downward movement of the plunger. and another portion of said stud adapted to enter between the extensions or wings on the line circuit. 8 rings and force them out of con- ;tacthwiti the talking circuit npriugs and into contact with the aigualingz circuit springs durinf a further downward movement of the p anger.

20. A telephone switch apparatus for controlling a plurality of circuits. comprising in combination a series of switching plungers means to engage and hold depressed suitiplanners, a

lephone circuit. controlled by slut thcrcthroinzh, a i-aipilecircuit prings itudiniilly movin inoperative eani-eigiagin cechof .-aid plunpera. a loii pu-itiou am provit cd with a surface. each of said pluiigcra provid wit a coin to shift sillti plate lengthwise, and means whereby the movement of said plate by the cam of any one of stlitl plungera opens a circuit to c\'clude from the home'atation all the telephone circuits controlled by the other ilungers.

n a telephone switch apparatus of the character de cribed, a group of circuit '-'s rii iga consisting of a pair of inner springs for the talking circuit, a pair of outer springs for the signaling circuit. and a pair of intermediate sprin for the line circuit, all of mid apriuiia being normally electricall v diaconucctcd from one another. and each of said line eircuitsprin having an extension or wing otl'i-et from the line of the other springs, in combination with a switching plunger carrviug a stud consisting of two portions of ditl'erent diameters extending aterally therefrom, the rtion of the stud of the. smaller diameter a opted to enter between the talking circuit aprin and force them outwardly ap'ainst the ine c'irciiit apriuga during the iii-at part of the downward movement of the plunger, .and the other portion of said at'ud of the larger diameter adapted to enter between the extensions or wings on the line circuit sprin and ftll't't' them out of contact with the talking circuit springs and into contact. with the signaling circuit aprin during a further downward movement o the plunger.

31. A telephone switch apparatus for controlling a plurality of circuits. comprising in combination a series of switching plungers means to engage and hold depressed saii plungcra, a telephone circuit controlled h each of said plungers, a movable plate icl iugly held in inoperative position an vided with cam-engaging surfaces, said pluug'cra provided with came to enga aitid cam-engaging surfaces and move nan late and menus wherebv the movement 0 min plate by the cam of' any one of said lungem opens a circuit to exclude from he homo ntution all the telephone circuits controlled by the other planners.

Signed by me at llloeton. Massachusetts, this 5th day of August, 1908.

Ciuauca D. Womanizer, Romain Clioiiamii.