US2374082A - Telephone call transmitter - Google Patents

Description

ApriE 17, 194-5. DQWEY TELEPHONE CALL TI RANSMIITER Filed Aug. 22, 19 42 5 Sheets-Sheet 1 v lNVENTOR y L. BOWL V 9 fi t- 3 (K0294 ATTORNEY A rifl 1?, 1%5. L, DQWEY 2,374,082

TELEPHONE CALL TRANSMITTER Filed Aug. 22, 1942 5 SheetS Sheet 2 ATTORNEV April 17, 1945. T. L.- DOWEY 2,37 ,082 I TELEPHONE CALL TRANSMITTER Filed Aug. 22, 1942 5 Sheets-Sheet a a0 3/ FIGS ATTORNEY T. L. DOWEY TELEPHONE CALL TRANSMITTER 5 Sheets-Sheet 5 Filed Aug. 22, 1942 Has ' INVENTOR 7. 1.. DOWE) 9. @afim ATTORNEY Patented Apr. 17, 1945 TELEPHONE CALL Thomas L. 'Dowey, Summit; J.', assignor to I Bell TelephoneLaboratories,Incorporated; New

York, N; Y.,-a corporation of Appl cation August'22, l942,-S;e j NQKL4 Q 'tablishing talking connections by the operation of. vibrative elements in a magnetic field for gencrating alternating current representingzthe operation of the keys.

According to the-call transmitter of the invention; theoperation of manually operable key members disposed in parallel rowsis effective to differentially actuate a pivoted plate and a ratchet, mechanism for imparting to the-plate, -in'addi-; tion to pivotal movement, a step-by-step transverse movement relative to indicating wheels for placing means carried by this plate in successive operative relation with means in the form ofv gear sector membersv to rotate the indicating wheels and code elements carried thereby for setting and indicating the call. 1 Means in the form of a manuailyoperable key membercontrols the return movement of the code wheels from selected to normal unoperated positions as efiected by the tension of respectively associated retrao-, tile springs, as for correcting a wrong setting of atelephone call designation and following each successive call transmitting operation. In a modification the control of the code wheels following the transmitting ofvav call is effected by a mechanism operable by the placing of the tele'--: phone .h'andset on its support, the operation of such mechanism in turnbeing controlled-by the movement of manually operable means "to po sitions indicated on the casing housing the transmitter mechanism. 7

' A pivoted frame actuated by the mechanism",

under control of the telephone handset, in one position permits the movement of the generator on guiding means transverse of the indicating" wheek from normal to starting position ineffec-f tively relative to the code elements such move ment being effected by the operationof a handle lever as 'for tensioning a. motor spring serving-to return the generator to normal for transmitting the call under control of electromagneticjmea'ns energized through the operation of switches placed at the telephone exchange with which the call transmitter of this invention may be con-i nected, i ,In a modification the 'back and forth operation n iovei'nent to normal unoperated' position as to cause the operation of the vibrative elements is simulated by the pivotal'operation of an angle; lever actuated through the tension of the motor of the generator relative to th'e code wheels in its;

anismn I v.flther novelfeatures and advantages of the invention will appear-from the, following descrip tion'and by thecl'aimsl:appendedthereto, reierencefbelng 'had'to the. accompanying drawings in which:

Fig. 1 is-a side elevation view; 1

.Figgzis atfront elevationview showing/the indicating wheels in operatedijposition; v

Fig; '3 is a top, assembly vview shown with a number otoperatingipartswith ortions broken away. the casing housing the I transmitter mechanism in horizontal section;

Fig; 4 ayertioal sectionalview taken on lin e n asorfrigviei ncwn, with a number of parts operated position but with the alternating cur rent-generatorin normal. non-operated pos tion; I

5 ,isf aI-Itop .view showing the I alternating generator in operated starting position; v 6 his a. vside view showin one of the keys digit indicating wheels in operated p0;

'sitiom r -.;-Fig-.- '7 isa I casing in'verticalcross. section;

Fig. 8: isa; :frontview showing the casing andv a number-pf operatin liarts in section taken on linei- -lof-Figu y *Fig. 9 isa top view the alternating current generator operating mechanism shown in Figs. 3, 4,5 ,and 6 modified;thegfenerator beingshownin-nomnalstarting position;

Fig. 10 isa siderview of Fig. 9; Fig. vllisa detail view of Fig. 9;

Figxlz is a side view of an alternative mechanisn'rifor returning the'indicatingwheels to nor- 7 mal non-"operated position;

"'Figil3 is' a detailed'view of Fi 12;

,F J15 is H y element's set ffor" transmitting a predeterm ned telephone can designation.

According to the calljransmitter of thisinvenom; base Ill is formed atitgfront end por tionwitl i a key mounting consisting of two'up-' right jextendi'ng portions ii and I2 intercon nectedb'y spacerplates l3, l4 and I5, the spacer plate ,I5. having rectangularly-shaped openings cooperating with circularly-shaped openings in the "spacei'piates l3 and H for guiding a set'of longitudinally movablej key membersjKl, K2, K3;

, from-mama tonoperated position against spr control "of a speed governor mach-g rear view shown with the- "g. 14 is'a-view-of one ofthe code elements;-

adiagramina'tical view of the code On base ID, as shown in Figs. 3, 4, 5 and 8, are

mounted the upright supports 2| v.and. 22 pro-V. vided for supporting a shaft 23 on which are mounted for free rotation thereon a plurality of;

digit indicating wheels WI, W2','W3,' WLWEWG;

W1 and W8. The wheels Wl, W2,'W3,' etc., are

each provided with a pinion PI, 1 2,23, P4,. P5,

ing rods 60 and 6!.

of a coil 5| and are secured collectively between i the pole-pieces 4'! and 48 by a pair of eyelets 49 and 50, see Figs. 5 and 6, serving for slidably mounting the generator thus constructed on guid- These rods are in turn supported at both ends in the arms of an inverted U-shaped frame 65, itself pivoted on a shaft 82 supported at both ends in lugs 63 and 64 formed with the base ID. The frame 65 hasan armature 66 disposed in attractable relation with a magnet 61 provided for moving the generator and the vibrative elements carried thereby against the tension of a retractile spring 82 out of engageable relation from the sets of code teeth formed at the periphery of the digit indicating wheels WI, W2,.W3, etc., for a purpose which will be P6, P1, P8 engaged by respective gear sectors SI,

S2, S3, S4, S5, S6, S1 and S8 which are pivotedone, common shaft 21 jpurnaled at both endsin upright members formed with a support 25, turn secured to the base lfl as by. a number'iof' screws SC. 'Ihe gearjsectors SL252, etc., are.

formed with similar projections so disposed as to be engaged by respectively associated lug members 21 upon the step-by-step transverse move; ment of plate l'l on its supporting shaft l8' as effectedby a ratchet mechanism consisting of a crank arm 28 resting on the plate 11 against the tension of a retractile spring 32 as shown in Figs. 3, 5 and 6.. This crank arm is -formed conti uous-to a rod 29 pivoted at both'ends in lugs such; as 30 and 3| formed with a base Ill while the; opposite end of rod 29 is bent at right-angles to the length of the rodjor mounting an actuating pawl 33 best seen inFig, .3 held inoperative-relation-withthe ratchet teeth 34 formed at the rear edge .of plate I! by a retractile 'spring 35, while a pawl 36 holds the plate l1 ineach advanced position against the tension ofa retractile spring 31'. The plate I! when in normal non-operated position as shown in Fig. 4, has its lug portion 21X placed directly for operating the gear-'sector Sl following the movementgof any one of the keys Kl, K2, K3, etc., for rotating the wheel WI to the position represented by thatkeyl The wheels WI, W2, W3, etc are held in se-- lected position against the tension of retractile spring S40 acting on thegear sectors SI, S2, S3, etc., by similar ratchetwheels 38 engaged by respectively associated pawls l l mounted on a common plate 42, pivoted on a shaft 43 and provided at one end with an arm 44, best seen in Figs. 4 and 8, the operation of which is effective to simultaneously. disengage the pawls 4 I .from their ratchet wheels to permit the return of thelatter to normal non-operated position as for can-.-.- celling and correcting a wrong call setting operation, the return of the digit indicating wheel WI and its actuating gear sector Si from selectedto normal non-operated position, being effective toengage and move a rod 45 --1ongitudinally against the tension of its retractile spring 46, see Figs. 5, 6 and 8 for disengaging .the driving pawl 33 and retaining pawl 38, simultaneously, from the ratchet teeth 34 of plate ll to permit the return movement of the latter to normal none: operated position as efiecteduby its retractile spring 31. 1 j H Thedigit indicating wheels 1W! WZ,.W3, etc

are provided at their periphery withsetsof code teeth 'as shown in Figs. 4', 6,12 and 14, representing the digits 1 to 0 provided for actuating vibrative elements in the form of reeds R1, R2, R3 and R4. These reeds extend through the core hereinafter described in detail.

' The lower end portion of one of the arms of U-s haped :frame 65 is formed with a projection on which rests the prong of a second U-shaped frame to which are secured the rods 69 con- I2 pivoted on studs 13 carried by the extensions 14 and li of a bracket 16. The arms H and 12 having their free end portions disposed in engaged relation with the plungers ll'jan'd l8'o'perated by gravity upon the placing of the telephone handset HS in a cradle in the form of projections PR carried by the casing 19 housing the'ti'ansmitter mechanism, the placing of'the handset in its cradle being effective to cause the pivotal movementofarms II and 12, the down ward movement'of frame -68 and thereby the pivotal movement of frame as for moving the vi brativeelements RI, R2, R3 and R4 out of enga'geable relation from the code teeth of the digit wheels WI, W2, W3, etc, against the tension of retractile spring 82.

The alternating current generator may be moved manually from normal non-operated position shown'in Fig. 3 to starting position trans-- verse of the wheels WI, W2, W3, etc., shown in FigL' 5 by'a handle 1ever'83 at one end of a shatt- 84'. J 'Ihisshaft is pivoted in bearings BiandBG formed with the base l0 and to the opposite end of shaft 84 adjacent bearing 86 is keyed a lever member 81, Figs. 3', 5 and'l', extending upwardly for connection with anarm 88 as by an adjust able link 89, theyarm '88 is provided at its free, end with a rollerv 9| engaging the edge of a plate: pawl 92; pivoted on the pole-piece 41 of the generator asshown in Figs. 3 and 5, while the return movement of the generator is effected by the tension of retractile spring 90 through the. engagement of roller SI at the end of arm 88 with a ridge 83 formed with the pole-piece '43- but un-- der control of electromagnet 6! in a mannerwhi h will be hereinafter described in detail. The gen- In Figs. eV and 10 is shown a modificationlinf wl iichthe back and forth movement of the piv oted frame 65 which supports the alternating current generator is eifected by an angle lever Nlfl pivoted on a plate lfll' secured to the polepieces and 48 of the generator andheld in re; tracted position by a spring 332. Angle lever I00 has one of its arms engaging the lever BB 'Which L under thetension of motor spring 90 causes the. "pivotal movement of angle lever" 'lfilldue' tothe" asvaosa WI, the motor spring continuing the'movement oi the generator on guiding rods I50 and BI to the point wherein the vibrativefreeds of the generator engage the code wheel W2 by the tension of spring 30 for repeating the cycle of operation 13; the arm WY of theinverte'd u shaped'f irame 68."is-p'rovided with a spring-pressed pawl I30 disposed in engageable relation-with a pivoted double armed lever member I3I, the arm NY :01

as described in connection with the code carried by wheels WI.

-The movement of lever 88 and that of the gen- I erator under the tension of motor spring 90 is effected under control of a speed governor through the operation of a shaft I04 journaled inarms I05 and I06 of bracket I6 and on this shaft is mounted ,for free rotation thereon a worm I01, meshing with a gearsector I08 'securely mounted on the generator driving arm 88, the'shaft I04 being rotated by the movement of the worm I0'I through a one-way operable clutch IIO in'the form of a ribbon spring coiled on the drum portion of worm I01 and the enlarged portion of shaft I04.

"In the modification shown in Figs. 9, and 11, a yoke I I2 has one of its arms normallydisposed in engageab-le relation with the free end of lever 88 so that the movement of this lever by the handle 83 i efiective to move the generator in the starting position shown in Fig. 9 wherein the roller at the end of the other arm of yoke II2 iscaused to engage a camming surface H3 for pivoting the yoke in position where its arm RM isdisengaged from the operating arm 88 while a second cam surface II4 (see Fig. 10) is provided for pivoting this pawl in the opposite direction following the transmitting of the call thus placiiig its arm RM in engagea-ble' relation with the operating arm 88 to prepare this mechanism for moving the generator from normal to starting position, the disengaged condition of yoke II'Z from arm 88 prior to the effective return movement of the generator being to prevent the damaging .of the generator operating parts as, for example, by the unintentional operation of the handle 83 during the effective or return movement of the generator to normal position. p

In this modification a spring-pressed pawl I I5 (Figs. 9 and 11) engages an arm lfizsecured to one arm of U-shaped frame 65 for normally hold ing this frame and the generator mounted theree oniin position wherein the vibrative reeds RL, R2,

etc., are ineffective to engage the code elementscarried by the wheels WI, W2, W3, etc., during the movement of the generator from normal to starting position, the engagement of. pawl H5 with arm II6 being efiected as byplacing the tele-- phone handset on plungers TI and 'Ii8 shown in Figs. 3, '4, 5 and 6 with the consequent operation of vertically movable frame 68, the pawl H5 being disengaged from the arm II 6 by a lug I formed with the plate IUI engaging the pawl H5 a small distance prior to the normal starting po-'- sition of'the generator.

-'In Figs. 12 and 13 is shownza modification of I which" is connected to one ender the rod I32, the opposite end of this rod terminating in the form of a disc I33 disposed in coaxial relation,v

with a compresison spring YX, while a second rod I34 is'forrned with a disc portion I35 engaging the other end of the spring and the opposite end of this rod operatively engages with th free end of an arm I36, the other end of which is secured to a plate I31 extending transverse'of the indicating wheels WI, W2, W3, etc., and pivoted at both ends as at I38 on upright supports I 39 and on pivoted plate I3'I are mounted a plurality of spring -pressed pawls I40 so that the pivotal movement of plate I31 is ei fective to cause the disengagement of pawls I40 collectively from their respectively associated ratchet Wheels 38 for permitting the return of indicating wheels WI, W2, W3 to normal unoperated position upon the operation of rods I32 and I34 in a manner which will be hereinafter described in detail. 7 v

Arod I4I having one of its ends extending through an opening in a casing C'I serves for mounting a knob I42 and an index I43 cooperating with instruction as the words Hold, Reset, printed on the casing and provided for'indicating the position of an arm I44 securelymounted on the; oppositejend of rod I4'I relativev to the arm 136 of the retaining pawls supporting plate 131, the arm m at the end ofrod m being to prevent the .pivotal movement of, plate I31 and thereby the disengagement of pawl I40 following.

the operation of arm IIIY the pawl I30, the double armed lever I3I and the rod I32 as for 'cornpressing spring YX whenever it is required or desired to repeat a call, while the rotating of knob I42 for moving the arm I44 to the position shown in dotted line in Fig. 13, will cause the operation of rod I34 through the tensionof spring YX and. thereby the operation of arm I36 for pivot ing the plate I3'I f0r disengaging the pawls, I40 from their respective ratchet wheels 38. g

A bar I45v (Fig-12) extends transverse'of gear sectors SI, S2, S3, etc., andfls secured at both ends to a pair of arms ,I46 pivoted at I41 on lugs formed with the base I0 and one .of the pivots I41 serves for pivotally mounting a latch I48 disposed for engaging a ratchet tooth I49 formed with rod I32 under the tension of spring I53, upon the movement of the bar I45 as effective by the operation of the sector members SI, 82, S3 from normal'to operated position, as for the setting of a call. The holding of rod I32 and arm I3I in operated position prevents the re lease of indicating wheels WI, W2, W3, etc.,

during the call transmitting operation and the reengagement of retaining pawls I40 with their respective ratchet Wheels S2, 83, until all the indicating wheels WI, W2, W3 have been returned to normal positionby the tensioning of a sma11 distance from'normal non-operated 'po-" sition. v v I y In a typical. example of operation in the trans mitting of the telephone call designation GP-34921-M, for example with the handset HS resting on plungers TI and 18 as shown in Figs. 1 and 4, frame 88, Figs. 3 and 4, through its arm TIIY' holds the frame 85, in position wherein the current generator and the vibrative elements carried thereby may be moved from the position shown in Fig. 3 to starting po sition shown in Fig. 5 ineffective relative to the code elements CEI, E2, (3E3, etc., carried by the indicating wheels WI, W2, W3, etc., as effected by the manual operation of handle 83, rotating the shaft 84 for moving the lever 86 at the opposite end of the shaft and thereby operating the arm 88 through link 89, the arm 88 engaging the pawl plate 92 as shown in Fig. 3, the generator being held in starting position as shown in Fig. and in dotted lines in Fig. 7 by the spring-pressed pawl 95 engaging the projection 96 carried by the pole-piece 4'! of the generator.

The operation of the key GHI ing upon the longitudinal movement of this key.

from its engaged point with this plate to its stop positions, through the projection 21X carried by this plate now in registry with the projection 26 of gear sector SI, thus rotating the indicating wheel WI to a position wherein'the letter G appears under the glass plate window I of casing CI, while placing the teeth Tl and T4 of code element CE of indicating wheel WI in a path to be engaged by the vibrative elements RI and R4 of the generator as will be hereinafter described in detail. The downward pivotal movement of plate I! causes a pivotal movement of rod 29 through its arm 28 and retractile spring 32 for advancing the driving pawl 33 carried by this rod, a distance of one tooth of ratchet teeth 34 (see Figs. 3 and 5) thus causing the lateral movement of plate H on supporting shaft I8 against the tension of its retractile spring 31 for placing the projections 21 of this plate (see Fig. 8) in registry with the projection 26 of gear sector S2 upon the return movement of plate I! to normal position when the key K4 bearing the designation GHI is released, the plate being held in each lateral advanced position by the retaining pawl 36.

The operation of key KI bearing the designation PRS I the second digit of the called designation abovementioned, is effective to cause the pivotalmovement of the plate I! for moving the gear sector S2 and thereby the indicating wheel W2 in position wherein the letters PBS 1 appear in registry to the glass plate II in the casing C, this indicating wheel like indicating wheel WI being held in selected or operated position by respective spring pawls M and this call setting operation is repeated for each successive key K3, K4, K9, K2, KI and M, the latter representing a particular signal not used in the setting of ordinary telephone call designations.

The removal of handset HS from plunger-s11 and 18 causes the arm to move the frame 68 upwardly under the tension of spring 82 serving to pivot the frame 65 for placing the vibrative reeds RI, R2, R3 and RA in operable relation with the code elements of wheels WI, W2, W3. etc., while causing the ratchet tooth 96 carried by the pole-piece 41 of the generator to slip sideways from the retaining pawl 95 so as to permit the movement of the generator on its guiding rods 60 and BI by the tension of motor spring 86 until arrested by the engagement of vibrative reeds RI and R4 coming into contact with the teeth TI and T4 of code wheels CEI carried by indicating wheel WI, causing the flexing of these reeds in timed relation with the energization of electromagnet B! through electrical impulses generated at the telephone exchange, thus disengaging the reeds from the code CEI element to cause the vibration of these reeds for transmitting signals corresponding to the selected position of wheel WI set by the operation of key K4. The deenergization of magnet 61 causes the pivotal movement of frame 65 under the tension of spring 82 as above men. tioned for moving the generator and the vibrative reeds carried thereby in position wherein the reeds engage the teeth T5 and TB of code wheel 0E2 carried by the indicating wheel W2, wherein these reeds are flexed under the action of motor spring 90 when the next energization of magnet 61 causes the release of these reeds so as to permit their vibration to transmit a signal corresponding to the operation of key K1 and this cycle of operation is repeated for each digit in the 'call designation GP-34921-M above-mentioned when the generator has reached its normal non-operated position and the handset HS i placed on the plungers I1 and I8 causing the downward movement of frame 68 and thereby the pivotal movement of frame 65 as above described when the key 44 is operated for moving the pawls 4| in position disengaging their respective indicating wheels which return to normal position by tension of retractile springs 40. The pivotal movement of frame 65 as effected by .the removal of handset HS from plungers TI and I8 is effective to place the guiding edge of pawl plate below the under surface of roller 9| so that the movement of handle 83 is ineffective to return the generator to starting position prior to reaching its normal non-operated position, but roller BI due to the pivotal movement of pawl plate 92 may be reengaged with the guiding edge of this pawl plate when the frame 65 and -the generator have reached their normal nonoperated position shown in Fig. 4. i

In the operation of the modified generator actuating mechanism as shown in Figs. 9, 10 and 11, the driving arm 88, as above described, engages one arm of angular lever I00 while the arm AR of this lever abuts against the bar I03. Under this condition the generator is moved from starting position by the tension of motor'spring 90 on its guiding bars 50 and SI causing the vibrative reeds of the generator to hex when coming into engagement with the teeth of the code element 'CEI carried by wheels WI and thereby momentarily. arresting the generator and causing the pivotal movement of angle lever I 00 against the tension of its retractile spring I02 for imparting a pivotal movement to frame 65 as for disengaging the vibrative reeds RI, R2, R3, R4, as the case may be from the code elements to the vibration of these reeds, the movement ofarm arrange 18 being. under control of thesned'ii vfi fin G through sear sector 08,.worm lit-1; ancielutchitm. 11111, this modification the. unintentionaa: opera tion. of .handle 83 as for moving. .thezsenerator tot-starting position during its call-.-.transmitt ingoperation. is: prevented by the positioning oith'e doublearmedlever I t2 by the cam H3 ll -az path wherein. this-lever is disengaged iromthe arm RB'LbutmeengagedWith the arm 88 when the: geni orator: reaches its normal starting position,

theicamtllr I Y -vInz.-the. operationv of the wheeL releasing mechanism asshown imflgsnltl an'd'.-13,.- .whenever: it is required; or 1 desired. to. repeat'a callythe arm I at the end of rod 'Hxtjis moved by the rotation of. knob [42 to tliexposh ti'on': s'howmin: Figs.v 12 and 13 wherein: the place ing: Dune receivenHS on the'p'lunge'rs 111 andill as ioroperating: the frame IO-Y, the movement mehtwith the tooth I 4'9- oi rod i32, simulta'-' neously with the movement of frame 88' by plac ing the handset-, HS on plungers It; and n at the termination of a. telephone'conversatiom-the pawl M a-however, holds the rod -I32 from 'oper9 ating until all the" digit indicating wheels have returned to normal unoperated position at which position the-spring l5] acting on the-arm flolioi bar 14-5 causes the pivotal movementofpawl M8 for disengaging the-latter from the tooth in thus permitting this red and the double armed lever- 13! to return to normal unoperateci posi tioh, so that" the quicksuccessiv'e placing "and re moving of the handset-on its plungers IT and-'18- do not prevent the full-return of movement of. the indicating wheels to normalnon operatctposition atthe' end of each successive call tra ns mitting operation. I r I 1 +Wha'tisclaimed is: I

1, In a call transmitter, a plural-ity of code ele merits disposed in arow, gearing mechanisms, a set of key members for actuating said mechanisms for moving said elements in selected position for setting a call, an alternating current generator having 'vibrative reeds, a motor,'means actuated by said motor for imparting movement to said generator at right angles to the movement and transverse of'said code elements to cause the engagement of said reeds with said elements for transmitting signals corresponding to the operation of said'key members and a governor mechanism for controlling such transverse movement;

2. In a call transmitter, a set of key members, a plurality of indicating wheels, code elements carried by said wheels, a pivoted plate actuated by the operation of said key members, a ratchet mechanism actuated by the pivotal movement of said plate for vmoving the latter in direction transverse of said wheels, andgear sectors actuated by the successive pivotal and transverse movement of said plateror actuating said indicating wheels for setting and indicating the call.

3. In a call transmitter, a set'of key members, a plurality of indicating wheels, code elements carried by said wheels, a pivoted plate actuated variably by the operation of said key members,

a. mec eaie esaetueied--.1 r. tnep fl -l movementaoiesld r ew.:- ;mevins t letter in direction: transve se: at. saidrw e a s c s ctuated bmhesncee s ve telan r e se mevementmfweaidrbla erior.a tu ti s i nd -v catin ;wheelsiiorcse ibaandl in ca i he ca arina me ns'iensione mythe o er of a I case n searzsectorsmWhet me ns fornormall echofirsaid wheelsin said indicating ldinfit. positiom...andi inv ti le; eans for a mating saidratchet means-fol: vpermitting the re: turn of said wheels to normal under thetension f.- eid I springs and, the operation or said. mechanism: upon; the return. movement or. :oneof said wheels for permittins theireturn i operation of all al bi 1i rality; of longitudinally movable ke members,. a pl eoperatem in; one; direction by 'the operationof said members, a. ratchetmechanism operated by y the movement .oisaid plate formatting the latter in: nniiormysten-byestep operation in direction at 'right .:ansles toithej first mentioned direction,

a. plurality ,ot-indicating wheels, codeelements carriectiby saith-wheels, gear'sectors; operatively engaging said: wheels, means carried: bysaid; plate for successively engaging. said gear sectors forv mowing; saidgwhaeels in; position for setting. and in--. dicatinetlrie call and analternatin'g cu'rrentgenorator movable: transverse of said. code: elements for engagin the latterton transmitting call sigmisrepresenting theaoperation oi said. key memiaspindicated hyrthelhsitiom of: said wheels.-

5151!). audit transmitter, a; plurality of. digit key members; a; plurality orindicating wheels actuated byztheloperation at said key members, code, elementsscarrdede'by eachtof saictlwheels, an'alternatingicurventgenerator'ihavin g vibrative reeds; a pivoted frame fort= said 3 generator; means for normally: po'sitionim';v said. firame wherein. the

moventmbofiisai'di generator I transverse of saidcodeiielementllamefiectiveirelativeto" said reeds,v manually; J operable means for". efiecting. such transverse-movement; a; motonspring tensioned: bythe movement; 61.5mm; manually: operable latching meanszfornormallyholding: said:

generatorirr snide operated positiorn and 'ele ctrormagnetic: means operable. tocause the operation. or .for prel'easing said generator tor: permitting itssmov'ement. to. cause the successive engagement of said code elements with said reeds during the return operation of said generator to normal position under the tension of said motor spring.

6. In a call transmitter, a plurality of key members, a plurality of digit indicating wheelsactuated by, the operation of said key members,

code elements set in selected position by the.

movement or said wheels, an alternating current generator having 'vibrative reeds mounted for representing the digits of said key members, gearing mechanisms actuated variably by the operation of said key members for rotating said wheels in position for setting a call, an alternating current generatona pivoted frame, means carried by said frame for guiding saidgenerator transverse of said'code elements; means operablefor normally maintaining said fram in position wherein said code elements are ineffective relative to said generator in itsmovementifrbni normal to starting position,- a handle leverior'efiecting such a movement, a motor spring tensionedby-the movement of said handle lever for returning said generator-to normal upon the operation of said operable means to render said code elements effective relative to saidjgenerator for transmitting the call. 1

8. In acall dicating wheels, a-common shaft for rotatably supporting said wheels, a set of key members, a

transmitter, a plurality of digit inpivoted plate actuated variably by the operation of said key members, a drivingpawl actuated under control of said key members in the setting of a call for moving said plate step-by-step in direction transverse of said wheels, a retaining pawl for holding said plate in each of said stepby-step positions, gear sectors,means carried by said plate successively engaging means-carried by said gear sectors for. rotating said wheel -according to the variable movement of said plate for indicating the number of the call, code elements set by the operation of said wheels, an alternating current generator having vibrative reeds, a plurality of means operable for moving said generator in direction at right angles to each other to cause the engagement of said vibrative reeds with said code elements for transmitting the call, means manually operable for permitting the return movement ofsaid indicating wheels to normal and means operated by one of said gear sectors for disengagingsaid driving and said retaining pawls from saidplate for permitting the return of the lattertonormal position following the transmittingof the. call. t

a 9. Atelephone call transmitterhavingahandset and a cradle forreceivingsthe .handset,.a frame actuatedby'the placing and removalioi. the handset from the cradle, a plurality of vcombined code and indicating wheelgmovable from normal to selected position ior,,setting a call, ratchet wheelsland retaining pawls for holding said indicatingwheels in saidselected position, .a, mechanism actuated by. saidframe for operating said pawls for: permitting the return move-.

ment of said wheelsto normal non-operated position, amechanism comprising a pawl carried by said frames, pivoted double armed lever member having one of its arms disposed for operation by said pawl upon the movement of said frame, a rod having one of its ends connected to the other arm of said lever member, another rod disposed coaxially to the first-mentioned rod, a compression spring disposed between the adjacently disposed end of said rods, a pivoted plate for mounting said retaining pawls, an arm carried by said mounting plate having its free end disposed for operation by the movement of the secondmentioned .rod for disengaging said retaining pawls from said ratchet wheels for permitting the latter to return to normal non-operated position, manually operable means movable in two positions, inone position permitting the operation of said retaining pawls upon the operation of said frame by the placingof the telephone handset in its cradle and in the other position causing the tension of said spring to be ineffective to operate said arm for disengaging said retaining pawls from said ratchet wheels for repeating the call.

10. A call transmitter having a handset, a set of key members, gear sectors, a plurality of digit indicating elements moved by the operation of said gear sector under control of said key members in position for setting a call, a plurality of ratchet means for holding said elements in said actuated positions, a mechanism having plunger members and a frame operable upon the placing of the, handset on said plungers to cause the op-- eration of ratchet means for releasing said indicating element following the transmitting oi the call, an abutting arm having an indicator, a pivoted bar actuated by said gear sectors in their movement for setting the call, means actuated by said bar cooperating with said abutting arm to render the operation of said frame ineffective relative to said ratchet mechanism upon the movement of said-frame following the removal and the placing of the handset on said plungers for repeating the call, spring means for retracting said bar to cause the release of the means actuated by said bar for permitting the return movement of said indicating wheels to normal upon the operation of said abutting arm by said indicator. v

. i L. DOWEY.

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