US1475500A - Selector switch amd connection - Google Patents

Description

Nov. 27 1923.

F. A. LUNDQUIST SELECTOR SWITCH AND commc'rrou Original Filed Aug. 21, 1918 4 Sheets-Sheet 1 17220127220 2: 1 fian/i .Lu zzwt dgwgmag 1 fi Nov. 27 I923 1,475,500

F. A. LUNDQUIST 7 SELECTOR SWITCH AND CONNECTION Original Filed Aug. 21, 1918 4 Sheets-Sheet 2 "Nov. 27, 1923, 1,475,500

V F. A. LUNDQUIST A SELECTOR SWITCH AND CONNECTION Original Filed Aug. 21. 1918 4 Sheets-Sheet 3 ii :9 w" Us 1:6 Q1

5 7 R 1 I 6 TE 3 [Q to laden/Z 57 wine/a5 Fan/L HZLUZCZQLZZSZT Original Filed Aug. 21, 191B 4'Shaets-Shaat 4 Patented Nov. 27, 1923.

UNITED STATES FRANK A. LUNDQUIST, OF CHICAGO, ILLINOIS, ASSIGNOB, BY MESNE TO-HENBY S.'CCNRAD, TRUSTEEIE PATENT OFFICE.I 4

ASSIGNMENTS,

snnnc'ron swi'rcH AND connncrlon.

- Application filed August 21 1918, Serial No. 2 50,373. ma w a 1 3m '19, i223.

1 all whom'it may concern:

Be it known that I, FRANK A.' Lonnqmsrf'a citizen of the United States of America, and a resident of Chicago, county 5 of Cook, and State of Illinois, have invented certain new and useful Improvements in Selector Switches and Connections, of which the following is a s ecification.

My invention relates to selector switches and connections therefor, and has for its object improvements in the construction and operation of automatic telephone exchanges.

In the accompanying drawings Fig. l is a, side elevation of the switch; Figs. 2, 3 and 4 are sections onflines corres ondingly marked on'Fig. 1; p

*igs. 5, 6, 7 and 8 are details of parts of theswitchy p r Fig. 9 is a section of a typical pneumatic motor ofyvhich there are several of difierent sizes in the switch;

Fig. 10 is asection of the valve arrangement used; in controlling the admission of air,to the,motor; and I 2 f Fig.'11'- .a' diagram of the switch and so m ich of ,thefelectrical connections as is toan understanding of the present i hi ie to Fig. 9-, the motor used is o composed olfai. stationary standard 15having'an axialopening 16, and, a tube 17 which fitsover. and slide s.on the standard A pipe: 18 compressed air between the top bf the standardl5 and the closd'head of rises and serves to move any obj ect'connected to it! When theadmitted air is permittedto escape,,the tube 17 returnstononn'al position, bygQthe action. of gravity or. spring.

There are four motors of this type mthc present switch. They all operate on the same principle, butdifi'er from each other in details; They will be referred to b characters applied to the moving tube.

I In Fig. 10 there is shown a casing 19 in which are valves 20 and 21. The valve 20 1 normally rests on its seat and revents compressedair flowing in the direction indicated by the arrows. Valve 21 has a projecting stem 22 adapted to be engaged by an armatnre lever 23 or by any other device to lift said valve and press it against its seat. The valves have ns 2% and 25 projecting toward cachcthsr and so arranged at if armature23 lifts valve21 to its seat, "alve 20 will be lifted from its seat and r it air to flow to pipe 18, which is the ame pipe as that shown in Fig. 9; In theiwords, when an armature lifts the valves in a casing like 19, compressed air iows thru a pipe ike 18 to operate a motor like 17. hen the armature falls, the air in the motor is permitted'to escape by passing around valve 21 and its stem to' outside soace. The valves in this switching mechao5 msm will be referred to by the casings which contain them. i l I The frame 'ofthe switch is composed of a bottom bar 26, a top bar 2fl; and endlbars .28 and 29. "Near the centralfpartfof thi's'70 frame is a vertically movabl'motolBO pliedwith. compressed airfg'thrn "a 31 and controlledby valvesiffi'easing 32; The motor'fit) hason ita icker): adapted be engaged by a pawl f34foi1ithejdclsliaft 35. The teeth ofrack'33'areso arranged'thatf the pawl 34 will suppdrt tliefmotor'30 inits elevated position after: the air whichmo ves it h s been P rmit do es ap -1 5 Z -onl ow' 03 sn hetmk 36 r cl s its teeth facing;, inj the opposite direction fromf tho's'e 'of 33f pawl"? 'on'iock h -W38 isl s h df. g "J hit fl i rack 36' tojfsto'pf-th'"'jlpv'wrar of; motorBO under th 'oiifofcomp l egsd aiii; B5 A spring 39 acts bl'l 4o'. i fi' pav r1 3710 normally hold said pawl ffi oni engagement withii aclr" 36,? as Trimm r. O' n i d' carried'i'n a frame 41 whichiis secnredto the outer end at a horizontahfiotoif The motor 4-2 is operated by compressed ziiifcoming thriip pes43'and44' valve casing The roller 54 running on track 55 supports the weight of the parts on the outer end of the motor 423 Secured to the top of motor 30 are arms 6 56 and 57-,-: and on these arms are insulated wipers 58, 59, 60 and 61 adapted to engage hank contacts shown in the upper part of Fig. 11. When motor 42 and magnet 53 act to move motor 30 to the right, the wipers are advanced 'ste'p b step to successive posi' tiop s under vertica rows of contacts, and when" when'smotor 3Q acts; the wipers, are moved "iipivard' to successive engagement with contacts in pre-sele'ctedrows.

o (fi ieiti gma mi ath c wa roller cshr -anged'ito be, :e, lgedhy t-hteeth of ilieescape wheel semen thaigwheel rotates. When" such .enga'g'eifient the teeth of wheel 50 vibrate ar'xii'itfi to open and close whenjth'eg iiotoig 42? is. jnorxhal posi tion, a 'pin'66 on said"mo tor"ep'g.ags arm '62 to lift roller ear ;of-,wh'eel5b"and 2 hbid sgri spa an in electrical connec 4 tion w thpach'otherl 'But when motor 4-2 e sg 'idmna the peh he p n 4 leaves the arm. ,62 l and "roller filiialls to ene ent with? the teeth of wheelf 50.

two pavilsjfis; an ,6 .irranged to engage a. stationary "atcl iet 'ffliholtedto'end bar 28.

engagesthe tail "efpawrea e ho'l jsaid pawl 3 away'fromratchet' '7fl when'tBemomr is in .itslowerpr normal posi' ionq But upon then-motor l nojvin'g upward, the lpr'o'e'ction 71' leaves the. tail "of pawl 69 and 'sai pawl becom's. free to engageratchet 70.'- The tail of the ,pawl 68is1normally engaged by a bar 72 secured to the; of ash'ort stroke motor 73.sup lied with compressed air thru a pipe 74. EVhen the tail of pawl 68 is thus engaged, said pawl is held out of etigagement with ratchet 70, but when the motor 73 operates to lift bar 72, pawl 68 falls into engagementwith ratchet 70.

Shown at the lower ri ht hand part of Fig. 1 is the apparatus wiich compose the motor switch of the selector. This switch has some of the characteristics of the well known side-switch but is here called a motor switch because its most-important functions involve the control of motorseither directly thru a valve or indirectly thru magnetic devices. The stationary contacts of'the motor switch are secured to a bracket 75' carried on the end bar 29. The wipers of the .motor switch are secured on an irregular disk 76 pivoted at 77 to a plate 78 fast to the end bar 29.

Pivoted at 79 on plate 78 is a hell crank lever 80 which has one end restingon top of motor 81 and has on its other end a pawl 52 (Fig. 6) arranged to engage teeth on the "Pivotedto a brac' t on th' endbar 28 lower part of disk 76 to turn said disk on its pivot and thus shift the motor switch wipers from one set of stationary contacts to the next.

livoted at 83 is a pawl 8": arranged to engage teeth.- in the upper part of disk 76 and hold it in its advanced position when moved by motor 81 acting thru lever anal pawl82. The pawl 84 is connected by a rod 85 to a bracket 86secu1edto thbshaft 3:). The shaft 35 has a small lon itudinal movement as representedby the collars 87 on'each side of the end plate 29 as shown inF 1i Thepawl 34 is not connecteddirectly to thefshaftfio but to a" sleeve SSfwhich is slidable pn said shaft and is conneeted'to" frame il Attabhed to lthe gear48" is a case 89 in whichis anordinary'cloek spririgacting;t0 return the motor 42fto1norma'l'position'when air is exhausted therefrom In such return, the awl-341 strikes a small collar 90 'onfth'e en'd jof 35 to 1 move said shaft to the left; longitudinal movement acts thru bracket 86'and rqdSfi to lift pawl 84: from engagement with" the teeth in the upper 'part'of disk 76: When mptor 42 movesfromits normal position, the sleeve 88' slides on shaft to .car1'y pawl 34 away from collar 90, andsprir'i'gfil actingl on pawl 84: moves the shaft 35 to the right and permits said pawl to engage the teeth on disk 76. f

A small'Jnotor 92 has an upwardly projecting rod 93 on which is a collar'94 which is. in contact with the upperface of an arm 95 on bracket- 86 (Fig. 7); A spring 96 on another part of the bracket acts to hold collar 94 and arm 95 in engagement with each other. The construction is such that when compressed air is supplied to the motor 92, the shaft 35 is rocked to cause pawl 34 to engage the teeth of rack 33. Whennir is exhausted from motor 92, the-shaft moves in the op 'osite'direction to release pawl 34 from ract 33.

On the hell crank 80 is air arm 97 which cxtends'np tovalve casing 32. \Vhcn the hell crank is in its normal position thearin 97 acts to open the valve so that-compressed air can flow thru casing 32'and pipe 31 to motor 30. When the motor 81 acts to more bell crank 80, then the valve closes in casing; 32 to shut off the supplyjto' motor 30.

Pivoted atja convenient place near the motor switch is a lever 98, one arm of which engages the. stem of the valve in casing 99. A spring presses the lever 98 against the pin of valve in casing 99 so as to normally holdsaid valve open and permit compressed air to flow thru casing 99 and pipe 101 to casing 32. On one of the motor switch wipers is a projection 102 ada ted to engage the other arm of lever 98 hen the motor switch is in either its normal or its second position, the projection 102 is clear 01 lever 98, but when the motor switch reaches its third or final position the projection 102 engages lever 98 to move it away from the pin of valve in casing 99 and permit said valve to close.

Secured to the upper bar 27 is a slow magnet 103 whose armature 104 is on the shaft 38. When the magnet 103 is ener gized it rocks the shaft 38 to move pawl 37 into engagement with rack 36, and also to cause arm 46 to open valve in casing 45. Because magnet 103 is slow it holds its armature attracted during the sending of im pulses due to operating the calling deviceat a local station.

Supported on the frame of the switch or at some other convenient place is a relay 105 (Fig. 11) which has two armatures and combines within itself and connected parts all of the functions of fast and slow line relays. Adjacent to the relay 105 is a valve casing 106, the valve stem of which bears against the armature 107 to hold it in its retracted position by reason of compressed air. froma source or general supply entering the other end. of the casing and acting to hold the valve closed. A spring 108 acts tohold the armature 107 againstthe valve stem, but theforce of this spring. is a little less than that required to open the valve. When the magnet is energized it attracts the armature 107 to open the valve in casing 106 and permit air; to1flow to pipe 109. After the armatureisattracted, the circuit thru' magnet 105 may bebroken and remade under the conditionsjised in ordinary calling device operations. :-:In other words, the va ein casing 106 and-the e ring 108 act to make relay 105-a slow re armature;107 is concerned.

The armature 110:has;no such connections to it, and consequently res onds to ordinary impulses sent thru 105. elay 105 is a fast relayas v.far as armature llO is concerned.

The subscriber at his local station is con nected by line wires to a line switch atthe central office. 1 w r 1, A

By the operations of his line switch theisubscriher has his line wires extended to lines 117 and 118 to this switch. Hence, wires 117 and 118 become line wires leading to'a'local station and over which the. subscriber may send impulses by operating his calling device. The first circuit :coming to this switch comes to line 111 and then continues thru l12contact arm 113--114-115 to battery X. Battery'X is a. common battery, and the circuit just givenin part starts from the other side'of this battery and goes thru a magnet on the line switch to connect the lines 117 and 118 to the local station. This circuit belongs to the-lineswitch and is referred to here only because part of it appear in this switch.

lVhen a subscriber operates his calling ay as far as device after being connected to this switch a circuit is completed as follows: Battery- X-resistance 116-117 to local station and back over 118relay 105119X.

This circuit thru relay 105 attractsarmature 107 to open the main valve 106 to permit compressed air to flow from the source to the local supply pipe 109. From pipe 109 air flows to motor 92 which rocks shaft so that holding pawl 34 may fall into ratchet33. It also flows to motor 73' which lifts bar 72 so that holding pawl 68 may fall into ratchet 70.

When armature 107 was attracted it closed springs 120 and 121 to make a new circuit from the line switch over wire 122 to take the place of the circuit over wire 111 which becomes broken at 112-l14 by the first advance of the motor switch. The closure of springs 120 and 121 also close a circuit as fol lows: X120121-123-124slow magnot 103-1251266564-127X.

The attraction of armature of magnet 103 tilts shaft 38 to open valve which permits air to how to the small quick motor 81 and to the horizontal motor 42. Motor 42 can not operate as it is held by connections to escape wheel and can move only when the magnet 53 operates. But the motor 81 0perates on the bell crank 80 to shift the motor switch arms from normal position to the next. adjacent position, and also to permit the normally open valve 32 to close. When armature 107 o ened valve 1062s before thru relay 105. One of the things done is'adv l 10. would close a-circuit for the magnet'53 if ita vancing the motor switch one step. This were'not for the fact that the fast armature 110 operates at the same time to open springs 128 and 129. But upon breaking the circuit at the local station, armature 110 falls back and a circuit is completed as follows: X. 128129130-131-switch arm 132 -133- 13453-123121120X.

Im pulses sent over this circuit operate the escapement to let the motor 42 move the motor 30 and its connected wipers step by step to positions under successive rows of cont acts shown in the upper part of Fig.11. The number of steps the escapement makes is determined by the number of impulses.

which the subscriber at his local station sends by operating his calling device. Upon making the first step, the pm 66 leaves the arm 62 so that roller 63 falls to contact with escape wheel 50 and opens contact springs 64 and 65. Each tooth passing roller 63 closes these springs, but they are left open at the termination of the last step.

The springs" 64 and 65 are in the circuit torthe ma a slow ma et its armature remains attracted during the stepping of the escape ment. But upon the stoppage of the motor 42, the open condition ofthese springs permanentl breaks this circuit thru magnet 103, an its armature falls-back to permitvalve 45 to close. p

The closure of valved? shuts the complessed air-from motors 42' and 81 and opens *the exhaust; -Owing tothe fact that the pawl 68 had prviously'eng'aged rachet 70,

the exhaust from motor 42 does not permit that motor to return to its normal position at this time. For 0 erativcu'rposes, a "check valve 43 (Fig. I? is placed in the pipe 43 so as to cause the exhaust from motor 42 to be gradual instead of sudden.

But the exhaust from 81 is immediate with the result that the bell crank 80 falls back opens valve 32. .Vhen motor-42 made its first movementto' the right, the shaft 3fiand'connection 86 also movedto the rightto p'ermit holding pawl 84 to fall into theupper teeth of disk 76. As a result the finotor switch is held inits moved position aficr the bell 'cra ik'SO- has fallen back.

Opening the valve 32 permits compressed air to'flow thru 109-99 -101-32--31 to motcirf30. This starts the m'otor30 to carry its wip'ers'upward on atrunk hunting expedition. As in some well known constructions, idle trunkshave-battery connections to them sothatwhen the wipers come to the bank terminals of such' a'trunk a current will flow as follows; Battery 'connection135-found contact point 13tr-Wipers 59l25-magnet 103124--123- -121'120-battery X.

'Energizing magnet 103 tilts shaft 38 to throw'p'awl 37 in ratchet 36 and stop motor 4 jwit-h its in contact with the found trunk. The tilting of shaft38' also opens valve 45110 permit compressed air to flow to motors42 and 81. Air flowing to motor 42 does nothing at this time because magnet. 53 does not} operate, but'motor 81 acts to shift the rtiotor switch to its final position and to'perinit valve 32170 close.

The closureofvalve'32 permits air to exhaust from motor 30(but as the holding pawl 3 is inengagement with ratchet 33 by .reasonof compressed air being in motor 92, exhausting'air from motor 30 accomplis hes not-hin at this time. The final movement'of the motor switch moves lever 9850 that valve 99 may close and cut the su ly of air from valve 32.

en the wiper 59 came to engagement with the idle contact point 130, the wipers 60 and 61 came to contact points 137 and 65 138 connected to Wires-139 and 140 leading ct 103, but as this is to the next switch which may be either a selector or a connector. At the time the motor switch was shifted to its final position it connected the line wires 117 and 118 to wipers 60 and 61 and hence to wires 139 and 140 so that thereafter these wires become line wires leading back to the calling local station. The completed connections thru this switch are as follows: 117-141- l4=2-arm l13143l4-l61-138-140;and 11Scontact points closed by arm 132'- 1=l660137139.

W hen the wipers reach an idle trunk, the switch at the cm] of that trunk (selector or connector) moves to break the battery connections to 135. This breaks the circuit thru magnet 103 so that shaft 38 may return to its normal position. This permits stopping pawl 37 to become free from ratchet'36, but as compressed air had previously been cut 015' from motor 30, this a complishes nothing. 1

The return of the shaft 38 to itsnormal position lets valve 45 close to cut'ofi' compressed air from motors 42 and 81. Nothing happens at motor 42 because pawl 68 is in engagement with ratchet by reason of comprcssed air being on motor 73. It should be noticed that pawl 69 is also in engage-mentwith ratchet 70 by reason of the fact that the upward movement of niotor 30 had lifted the projection 71 from the tail of pawl 69. Pawl 69 will hold until motor 30 returns to normal pawl 68 has been re eased by theexhaustof air from motor 73. This will appear later.

Cutting the air supply from motor 81 lets bell crank BOreturn to normal-position and open valve 32.= But as valve 99 had been previously closed 'by reason of the motor switch moving lever 98,"nothingresuits from the opening of valve 32. And as pawl 84 is still in engagement with ratchet 76, the motor switch is retained in its advanced position when the bell crank 80 falls back.

During subsequent operations inmakinga call, and during talking, the relay 105 is the only electrical device on this switch which continues to receive current. 'By examining the circuits it will be seen that this relay is bridged between wires 117 and; 118, and that the circuit for the relay will be broken when the calling subscriber breaks connection between the wires by hanging up his receiver. Current flowing thru relay 105 maintains its armature 107 attracted to hold open valve 106 and keep air pressure in pipe 109. Small motors 73 and 92 connected to this pipe are the only motors which take air pressure during talking.

When the calling subscriber. breaks the connection between 1 17 and 118, the armature 107 falls back so that valve IOS-may shut ofi the air supply from 109. When this osition; which is after occurs motors 73 and 92 fall back to normal osition. In doing this, bar 72 of motor 3 lifts pawl 68 from ratchet 70, andmotor 92 permits pawl 34 to fall out of ratchet 33. Then this occurs motor 30 falls back to its lowest position and causes projection 71 to release awl 69L -With pawls 68 and 69 both released: the spring in case 89 returns motor 42 to normal position, carrying the parts in frame 41 with it." As these parts approach their normal position, pawl 34 strikes colhr 90 on shaft 35 to move said shaft to the left and release awl 84. When this occurs spring 76 ig. 63) returns the motor switch to its normal position.

For the purpose of making the neral operation more understandable, I wil give a brief review of what has preceded.

The first impulse coming to this switching mechanism passes thru the line relay (magnet) 105 to attract its armature 107 so as to open valve 106 andadmit compressed'air to the local supply pipe 109. As a consequence of this, motors 73 and 92 are operated to bring the holding pawls 68 and 34 into operative position. As motors 73 and 92 always operate simultaneously they may be considered as simply duplicate representatives of the same thing in the same sense that the same battery is frequently shown at. several places on the same-drawahe same impulse thru relay 105 also closes contacts 120-121 for magnet 108 which in turn opens valve 45 and admits air from pipe 109 to motors 42 and 81.

The motor 81 closes valve. 32 so as to intercept the flow of air to inotor 30, and at the same time it shifts the motor switch to make a, circuit for magnet 53 so that other impulses thru relay 105 will cause magnet 53 to release motor 42 step by step.

When this stepping stops, circuit is broken for magnet 103 at springs 6465, and valve 45 closes. This causes motor 81 to fall back so as to open valve 32 and start motor 30 upward. When an idle trunk is found, a new circuit is completed for magnet 103 to again open valve 45 and cause motor 81 to again shift the motor switch.

Motors 42 and 30 are switch. moving motors. Motor 81 is a circuit shifting motor which also controls valves for motor 30. Motors 73 and 92 are pawl motors.

The'motors herein described ma be made ver cheaply and will operate a long time wit out attention or repairs if it is not necessary to fit them accurately to prevent leakage. The valves herein described are of the self-closing type, and it is to be ob served that valve 106 is opened to admit compressed air to the local suppl pipe 109 cnlv' when the "switching mec anism is called into operation. At all other times magnet.

the valve 106 is closed and it is not possible for losses to occur b leakage when the switch is idle. During operation, com pressed air is admitted to the main motors 42 and 30 only during brief intervals, and is continuously used only for pawls 34 and 8. Because of the valve arrangements, leakage at the motors becomes a negligible quantity.

W'hat I claim is: i

1. In a switching mechanism having power devices for moving parts of the mechanism in directions perpendicular to each other, pawls designed to hold such movement when made but normall in inoperative positions, pneumatic devicesfor controlling the operative condition of said pawls, a valve for admitting compressed air to said pneumatic devices, and a magnetic device for controlling said valve.

2. Power devices for moving a switching mechanism, holding pawls, pneumatic de vices for bringing said pawls into operative position, and meanstfor controllingthe flow of air to and from said penumatic devices.

3. A neumatic motor, an escapement for controlling the movements of said motor, a relay, and means by which saidrelay simultaneously controls the 'operationsof said es- 5 capement motor.

4:. The combination with pneiimatic motor, and Ian fescapement by which, the

and the supply'of air said motor is fcontrolled, o;f a';relay,havi ngftwo armatures, meansby which on e; armature controls the supply or air tothh' motor,- and means by which the-other armature controls said escapem'ent l 5-. A 1 1 5"p n pti r i t i ei 'ii 'd P su e, a e ma iecme anaam ce arranged ,to permit air to lflow'hfrom thfe flpip'e to the motor, a magnet for'ogerating; the valve, an escapemengf or ,con, nolling-l the movementsof the, motor and meansgoper ating thru'istoppralige of escapeinept ,rnovements for hrea ng lcirp iit 'forj said 6. A pipe, a switch"op'erat i ng motor and other pneumatic devices connected -.to .said pipe, mea-ns for admitting compressed air to said pipe so that it: ,mayflow tothe devices connected thereto', and t'neans operated by the admitted air forintercepting the flow to the motor before said motor can operate.

7. In a switching mechanism, a pipe having branches leading to avplurality of. devices, means for admitting compressed air to said pipe, andquiclr 'qperating meansin one branch for interce ting the flow-of com pressed air to another. ranch.,,

8. In a switching mechanism, electrical and pneumatic devices for operatingsaid mechanism, a motor switch serving to control both electrical circuits and the flow of its i so

air to pneumatic devices, and a pneumatic motor for operating said motor switch.

9. Inc switchingmechanism, a supply pipe, a valve for admitting compressed air to said pipe, a pneumatic motor connected to, a branch of said pipe,,a relay, and means by which a series of impulses flowing thru said relay will hold said valve open and control a step by step movement of said motor.

10. Wipers, a pneumaticmotor for moving said wipers, an escapement for causing said. motor, to .make its movements step by step, a magnet for operatin said escapement, and a,relay for control ing said magnetand the supply of air to said motor.

11. Apneumatic motor, amagnet serving to open a communication for compressed air to ,operatelthe motor, and an escapement controlling the movements oilthe mot-or and the circuitjornthe magnet.

12.;In a switching mechanism, a pneu matic motor for movingihe mechanism in one direc ion angle second pneumatic motor for moving- ;itjn' another direction, a source of Q mP eSSed ,air havingconnections to bothmgtors, valvesin sa'id connections servinjg .to' lcontrol thes@ply;of airgto the motpi s a ma ,et hav ng ;an armatnre, and cans b v s ififchsng {in .the POS Q of the co str e will. change the wive s a to shift the open connection from onemotor to thectb or m 153 L iDHJ -Q i i.W PDQ" I ...'at im ri sp t ds w h eenn e a. source of; compressed ,air, ivall'ves arranged t9 q itm the given nd closed, con ti n of saidcjfiiiect'eu i and, magnetarranged to alternately open and close Said alves,

131, In a,s vvitching mechjaniism, two pneum aticiprovided with connections to s 'r iicomp sefljai fand, m gne rranged, to alternately open and close said cnnnectipn's. V p

" 15$ In a'switchin mechanism. two pneumatic motors provi ed with connections to es ur p s efl.-air,..= ma

ranged'to alternately open and close said connections, andmeansfor controlling said .xnagnetlbythe pa'rtsmoyedby said motors. 16"I n a svvitchingmechani'sm, two pneumatic motors, a locally energiaedmagnet ar- ',r to controllsaid rnotoi;s' so as to cause the'm'to operate insuccession and means for controlling (said magnet from parts moved by said motors. A i i 1,7. In atelephoneexchange,the combination with syv itchingfmechanisrii, pneumatic unotors forlgperatinthe mechariism, a sup- F y team ra li es fer.a i fii s r he mee the be eit m esp lv normally cutting said supply pipe from a general source ofgcornpressedain and electii iczil devices for opening said special valve,

flhe combinatipn with a'relay, and a pipe for conveying compressed air ,to,pneu matic devices, of a valve controlling the supply of air to the pipe and the operations of the armature of the rela when electrical impulses flow thru said re ay. 4

19. Ina switching mechanism operated by pneumatic devices and controlled by a relay. a valve serving when closed to cut the pneumatic devices from a source of air pressure and serving when closed to control the armature of said relay.

20. In a switching mechanism, wipers. pneumatic motors for moving said wipersin directions perpendicular to each other, a supply pipe for saidmotors, and means for connect ng said motors successively to said supply pipe.

21. In an automatic trunk selecting system, a pneumatic motor associated vvitheach trunk, a source ,of compressed air, .au-

tomatic means controlled through',the.-, B-

lected trunk for admitting air to a ,inotor upon the selection of the associated trunk.

22. In an automatic trunk selectingmys tem, a pneumatic motor associated withieach the selected trunkffor ,admittin'g arryto a m tor up n the sel c i n, fAheo QQ ete u p p a 24. In ..a trunk selecting-system; switchingmechanism ,connected e trunk, a pneumatic; motor associatedlwfii each switching mechanism. .or ;moy,iiig it from ,normal position, ,a source ofiqompressed air, automatic means controlledthrongh the selected trunk for admitting ail'ji) a motor upon the selection of the associated trunk, and ,a restraining device for hglding' said mechanism against movement ,by saidanotor. 25. In a trunk selecting system ,having a switching mechanism ;on teach t zun pneumatic means ,foihmo ving (the switqhin mechanism, a 'SQUIGBqOf compri fised air gn automatic means; controlled ,through ,the

selectedrtrnnk' ior applying the,ail;.,to move a mechanism upon the selection of themssociatedtrunks 26,,In a trunk cselect-in'g' systemahg in ,a switching .mechanism on pneumatic ,means for moving the switching 7.

mechanisms, a source of compressed air, automatic means :controlled through the se'lected'trunk for applyin the air to, move a mechanism upon the se ection ,qflthassociatezl trunk, and a restraining device for holding the mechanism against such movement.

27. In a trunk selecting system having a switching mechanism on each trunk, automatic means controlled through the seleztcd trunk for putting a strain upon a mechanism to more it from normal osition upon the selection of the associate trunk, and an escapexnent for controlling the movement due tosuch strain.

28. In a trunk selecting system having a switching mechanism on each trunk, automatic means for putting a strain upon a mechanism to move it from normal position upon the selection of the associated trunk, and means for controlling such movement from a distant station.

29. In a trunk selecting system having a switching mechanism on each trunk, automatic means for putting a strain upon a mechanism to move it from normal position when the associated trunk is selected, an escapement for controlling the movement due to such strain, and means for controlling the escapement from a distant station.

30. In a trunk selecting system having a switching mechanism on each trunk, a source of compressed air, automatic means for applying the pressure of the air to a. mechanism to move it when the associated trunk is selected, an escapement arranged to hold the mechanism against movement by the air pressure, and means for controlling said escapement by electrical impulses flowing over the selected trunk.

31. In a switching mechanism, a pneumatic motor, an escapement for permitting said'motor to advance step by step, and a magnet operated by electrical imp from 'a. distant station for controlling said escapement.

' 32. In a switching mechanism, a wiper carriage, a motor for movin said carriage, a rack and pinion for contro ling the move ment of Sfl-ld carriage, and an escapement for controlling the rotation of the pinion.

33. In a switching mechanism, a wiper carriage, a motor for movin said carriage, a rack and inion for controlling the movement of said carriage, an escapement for 'iliary switch in swit controlling the rotation of the pinion, and an elcctromagnet for controlling said escapement.

34. In a switching mechanism, a wiper carriage, a pneumatic motor for moving said carriage, a rack and pinion for controlling the movement of sald carriage, and an escapement for controlling the rotation of said pinion.

35. In a switching mechanism, a wiper carriage, a. pneumatic device for movmg said carriage, a switch for controlling the electrical circuits of said mechanism, and a pneumatic motor for controlling the operation of said switch and said device.

36. In a switching mechanism, a wiper carriage, a pneumatic device for moving said carriage, a switch for controlling electrical circuits of said mechanism, and a pneumatic motor which operates in one manner for operating said switch and in another manner for controlling the operation of said carria 37. In a switchmg mechanism, a wiper carriage, a pneumatic device for moving. said carriage, a switch for controlling electrical circuits of said.,mechanism, a. penumatic motor which operates in one manner for operating said switch and in another manner for controlling the operation of said can'iagm and an electm ..niagnet for. controlling the operation of said motor.

38. An automatic switch, a ratchet wheel for controlling the o eration of said switch, a magnet for controlling 'said switch a circuit for said'magnet, apairof rings in said circuit operated by 'saidlrata et wheel to control the circuit of said magnet' 39. In a telephone on; automatic switch, an incoming ltrimkl individual-;..-to

gets on "switch normally disconnected said. incoming means for operating'said switch to select an idle one 0 said outgoing trunks, an auxfor connecting said wipers to said incor'niri trunk after said switch has selected said i e trunlgand a. pneumatic device for controlling the operation of said switch and said auxiliary switch. FRANK A. LUNDQUIST.

said switch,

ulses. said switch, outgoing-i trunks accessiblato

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