US2314801A

US2314801A - Telephone call transmitter

Info

Publication number: US2314801A
Application number: US293710A
Authority: US
Inventors: John G Roberts; Ferry Dobbs; Charles D Richard
Original assignee: Bell Telephone Laboratories Inc
Current assignee: AT&T Corp
Priority date: 1939-09-07
Filing date: 1939-09-07
Publication date: 1943-03-23
Anticipated expiration: 1960-03-23

Description

March 23, 1943- J. G.l ROBERTS ETAL 2,314,801

TELEPHONE CALL TRANSMITTER Filed Sept. 7, 1939 6 Sheets-Sheet l Aro BCV/Q- 2a@ MM A. TTOR/VEV J. G. ROBERTS ETAL TELEPHONE CALL TRANSMITTER Filed sept. 7. 1959 6 Sheets-Sheet 2 A TTOR/VE Y Mardi 23, 1943.

J. G. RoBER'rsE-rAL l 2,314,801 TELEPHONE CALL '.LANSM-ITTERv Filed Sept. '7, 14939 6 Sheets-Sheet 5 t ATTORNEY -March 23, 1943- J. G. Roar-:RTS Erm. 2,314,80

TELEPHONE CALL TRANSMITTER Filed sept. '7, 1939 e sheets-sheet 4 FIG-6 @-44 y/ 2 a ,s s, l 2

7 Bl l l s1 4s SPH sa Kl w ss al a 5l o n 6a n un UQ @am ma( March 23, 1943. J. G. ROBERTS ET AL 2,314,801

` TELEPHONE GALL TRANSMITTER Filed Sept. 7. 1939 6 Sheets-Sheet 5 elo V J. c. ROBE/ers '/NVENmgf can/CHAR@ UQ @me 25 mdf( March Z3, 1943'. J. G. ROBERTS ETAL 2,314,301

TELEPHONE CALL TRANSMITTER Filed Sept. '7, 1959 6 Sheets-Sheet 6 J. c, ROBE/ers NVENTOS name/4R0 U@ @tu hmm ATTORNEY l Patented Mar. 23, '1943 UNITED STATES ATENT OFFICE 2,314,801 TELEPHONE. CALL TRANSMITTER Application September 7, 1939, Serial No. 293,710

13 claims.

This invention relates to call transmitters of the type used in telephone systems, for example, for establishing talking connections.

According to this invention, a call transmitter is provided in which the operation of a'set of key members representing digits is effective to actuate camming bars which in turn actuate spring retracted plunger members for selectively positioning stopping members in the path of pulsing elements actuated by a motor, means being provided for operatively connecting the pulsing elements to the motor in a sequence of operations corresponding to the order of the manual operation of the key members which may represent a given telephone call designation.

Manually operable means is provided which when moved in either one of a number of predetermined positions, conditions the motor mechanism for transmittmg telephone call designations by the so-called keY-by-key or preset pulsing operation `of the transmitter mechanism or to condition the transmitter mechanism for repeating a given call designation any number ci times desired without subsequently resetting the digit key members following the first transmitting operation of such call designation.

Means operable under'control of a camming mechanism is provided for stopping the operation of the motor at the conclusion of each digit transmitting operation by the keyby-key operation of the transmitter, while means actuated by the movement of the key members is effective to render the operation of such camming mechanism ineffective following the setting operation of the digit key members at a greater rate of Speed than that requiredY for the transmitting of a train of pulses corresponding to the individual operation of these keys.

Manually operable means is provi-ded for moving a pointer on a dial Whichindicates the position of -a cam shaft relative to a series of pawls, the operation of which conditions the pulsing mechanism for transmitting call designations which may consist of a number of digits less than the capacity of the transmitter while manually operable means is provided for tensioning the motor spring at the end of each call transmitting operation with means whereby the operation of such tensioning means is effective to return the operated camming elements and their associated stopping members to normal position preparatory to a subsequent call transmitting operation.

Other features of the invention and advantages will appear from the following descriptionV and by the claims appended thereto reference being had to the accompanying drawings in which:

Fig. 1 is a perspective View;

Fig. 2 is a top assembly View shown with. the casing partly in section;

Fig. 3 is a left side assembly view shown with the casing in section;

Fig. 4 is a right side assembly View also showing the casing in section;

Fig. '5 is a front assembly view showing the casing and a number of operating parts in section;

Fig. 6 is a sectional view taken on the line 6 6 of Fig. 7 and looking in the direction indicat-ed by the arrows, a number of parts being shown with portions cut away;

Fig. 7 is a longitudinal sectional View taken on line l-l of Fig. 2V and looking inthe direction indicated by the arrows;

Figs. 8, 9, 10 and 1'1 are partial viewsot the pulsing bar actuating mechanism shown with a number of operating parts in section;

Fig. 12 is a longitudinal sectional view taken on line 'l-'l of Fig. 2V showing-a number of parts in the operated position;

Fig. 13V is a front view shown with the casing and a number of operating parts with portions cut away, one of the keys and anumber of parts actuated thereby being shown the operated position;

Fig. 14 is an assembly viewV shown in perspective, a number of operatingV partsbeing shown with portions cut away;

Fig. 15 is a partial view of the` camniirig bar operating mechanism shownn perspective;

Fig. 16 is a detailed view showing the governor shaft stopping mechanism;

Fig. 17 is a detailed View of the mechanism shown in Fig. 16 showing the manually operable digit dening camming shaft in tlieop'erated position; and

Fig. 18 is a view of the digit pin4 setting' mechanism shown in perspective.

In the call transmitter of the invention, a base 29 is formed with lugs as 2| provided for securing a casing 22 byl a numberl of screws 23. This base is formed with perpendicularlly extending end flanges 2li, 2-5 and side flanges Z6" and' 2li for mounting the transmitter operatingrmechanism which will be hereinafter described in detail.

The flange members 2li and. 25u at the ends` of the base as shown in Figs. 2,. 3, 4, 5, 6 and'l support a set of horizontally and parallelly disposed rods b1, b2, b3, b4, b5, be and b1 on which. thev gear racks Rl, R2, R3, R4, R5, R5 and RLT ar'eslidably mounted. These gear racks engage slots as SL in a cross-bar 28 provided for holding these gear racks against turning movement on their supporting rods b1, b2, b3, etc., the cross-bar being secured at both ends on

side flange members

26 and 21 by a number of screws SC shown in Figs. 3, 4, 6 and 14.

On gear racks RI, R2, R3, etc., are slidably mounted one end of pulsing bars PI, P2, P3, P4, P5, P6 and P1, while their other ends are slidably mounted in rectangular openings RO in the supporting bar 28. The movements of gear racks RI, R2, etc. are imparted to their associated pulsing bars PI, P2, P3, etc. by similar springs, such as 29 shown in Figs. 3, 1 and 12 having one of their ends secured to the gear racks RI, R2, R3, etc. and their free ends frictionally engaging the under surface of pulsing bars PI, P2, P3, etc. for operating them and thereby actuating a common rocking bar 33 for opening a normally closed impulse contact 3|, Figs. 3, 5, '1, 13 and 14, the bar 30 being' mounted for rocking movement on a shaft 32 supported by side ilange

members

26 and 21. f

The pulsing bars Pl P2, P3, etc., are limited in their rectilinear or sliding movements as imparted by the gear racks RI, R2, R3, etc., by similar stop pins as 33 best shown in Figs. 2, 3, 1, 12 and 14 arranged in equal spaced relation in parallelly disposed rows in supporting

bars

34, 35, 36, 31, 33, 39 and 4i), there being ten pins in each bar.

The pins 33 in each supporting bar 34, 35, 35, etc. are friotionally held in normal non-operated position'by springs in the form of combs 4I shown in Figs. 3 and '1 secured at both ends to their respective bars by screws as 42 and 43. The pins 33 may be moved selectively from the unoperated position shown at :r: in Figs. 3, 5, '1, 12 and 13 to operated position in the path` ofthe pulsing bars PI, P2, P3, etc. as shown at :nl in Figs. 12 and` 13 through the manual operation of key members KI, K2, K3, K4, K5, KE, K1, K8, K3 and KIQ Vshown in Figs. 1, 2, 3, 4, and 5 in a manner that will be hereinafter described in detail. These key members are pivotally mounted on a common shaft 44 andare disposedin operative relation withthe camming or bearing portions of bars BI, B2, 133,134, B5, Bt, B1, es, Be and Blu shown in Figs..1 2, 13 and 14 which are connected at both ends on

similar links

45 and 45 so as to permit thedownward movement of these bars upon the operation of their associated key members. Springs such as 41, shown in Figs. 3, 5, and 13 bearing against the arm portions 43 of links 45 of each bar BI, B2, B3, etc. are providedrfor yieldably holding these bars in engaged relation with the under surface of the key members KI, K2, K3, etc. It is to be noted however that the surface of cross-bar BI that is nearest to the supporting shaft 44 at its point of contact with its respecf tive key as shown in Fig. 13 is made parallel to the longitudinal axis of this bar while the bearing surfaces of the other cross-bars proportionally increase in height so as to compensate for the difference in the length of the circular arcs generated by the pivotal movement of the key members at their points of contact or intersections with their respectively. associated cross-bars BI, B2, B3, etc., this mechanism permitting to impart a uniform axial movement to aset of pins YI, Y2, Y3, Y4, Y5, Y6, .Y1, Y8, Y3 and YI, see Figs. 5, 7 and 12 and to the stop pins 33 actuated thereby in Yresponse to the operation of any one of the key members K I K2, K3, etc.

, .The pins YI, Y2, Y3, etc. are slidably mounted 0n a carriage 5I shown in Figs. 5, 6, '1, 12, 13 and 14 and are held in normal non-operated position by hook-shaped retractile spring SPH. Carriage 5I in turn is slidably mounted on guiding

rods

52 and 53 for movement at right angles to the direction of the rows of pins 33 in supporting bars 34, 35, '36, 31, etc. and therefore longitudinally to camming bars BI, B2, B3, etc. the pins YI, Y2, Y3, Y4, Y5, YS, Y1, Y8, Y9 and YIIJ registering with the ten pins 33 in supporting bar 34 when the carriage 5I is in normal position as shown in Figs. 2, 5 and 14. The operation of any one of the key members KI, K2, K3, etc. is transmitted to its associated camming bar BI, B2, B3, etc. for operating its corresponding pin YI, Y2, Y3, etc. as the case may be against the tension of its retractile spring SP and thereby moving one of the pins 33.in the bar 34, for example, in the path of pulsing bar PI, for arresting its movement as imparted by the operation of gear rack RI in turn actuated by a gearing mechanism which will be hereinafter described in detail.

The operation of anyone ofthe key members KI, K2, K3, etc. as above mentionedis imparted to a saw-toothed rack 51, see Figs. 4, 5, 12, 13, 14 and 18through an angle lever 58 having one end loosely connected to the rack 51 and its other end engaging Ithe under-disposed surface of a U-shaped yoke 54, while the other end of rack 51 is loosely connected to a link member 55 pivoted at its other end to a laterally extending lug formed with the side ange 26 as shown in Figs. 5, 13 and 14. The movement of rack 51 is effective to tension a retractile spring ST having one of its ends hooked to the side ange 21 and its other end to a stud TU which serves for pivotally connecting one end of saw-toothed racki 51 to the free end of link 55 the spring ST thus serving to yieldably hold the yoke 54 in engaged relation with the underside of key members KI, K2, K3, etc. and the ratchet-toothed rack 51 actuated thereby in its normal non-operated position as shown in Figs. 5 and 14. The operation of any key KI, K2, K3, etc. and thereby the movement of U-shaped yoke 54 and the angle lever 58 is effective to impart a longitudinal movement to the saw-toothed rack 51 for engaging the tooth TI for example of this rack with a pawl 59 mounted on a shoulder screw 60 engaging the carriage 5I sov thatY the return movementV of rack 51 to normal under the tension of its retractile spring ST when the depressed key is released is effective to move the carriage 5I one step by positioning the pinsYI, Y2, Y3, etc. carried thereby in operative relation with the row of pins 33 in supporting bar 35 preparatory to the operation of the second digit key member KI, K2, K3, etc. as the case may be.

The successive operation of rack 51 as eifected by the operation of a number of key members KI, K2, K3, etc. representing a given telephone number is therefore eiective to impart a step- Icy-step movementy to carriage 5I for successively positioning the row of pins YI, Y2, Y3, etc. withV the pins 33 of bars 34, 35, 3B, 31, 38, 39 and 40 for a seventh digit exchange oce while tensioning the retractile springs 5I .and 6Ia on the guiding rods k52 and 53, carriage 5I being heldin each advanced position, however, by a pawl 62 mounted on theshoulder screw 60 and engaging a stationary saw-toothed rack B3 disposed in line parallel and adjacent to theV turn supported by side flanges and 21 as shown in Figs. 3, 1, 12 and 14. The carriage actuating and retaining pawls 59 and 62 may be simultaneously disconnected from their associated saw-

toothed racks

51 and 63 for permitting the return movement of carriage 5| to normal non-operated position at the end of each call transmitting operation through the operation of a plate 66 shown in Figs. 2, 3, 5, 7, 12, 13 and 18. This plate is mounted on four links 51-68 and 39-80 and is provided at its front end with a ridge portion 8| extending upwardly at right angles thereto for simultaneously engaging the

pins

82 and 83 laterally extending from pawls 59 and 52 and thereby releasing the carriage 5| which is then returned to normal position from any of its advanced positions depending upon the number of digits comprised in the telephone number transmitted by the tension of its retractile springs 6| and 6|a.

The plate 66 is provided with ten parallel slots 84 shown in Figs. 2, 14 and 18 through which the pins 33 in supporting bars 34, 35, 3S, 31, 38, 39 and 40 extend so that an upward movement of this plate through the operation of a camming mechanism, which will be hereinafter described in detail, is electve to return the stop pins 33 while simultaneously releasing the carriage 5| by the operation of pawls 59 and 62 as above described.

The upward movement of plate 58 is effected by a lever member 85 which is moved in the direction indicated by the arrow in Figs. 3, 14 and 18 and having its free end engaging the camming surface 86 formed at the edge of the plate EB, the lever member S5 being operated upon the return movement of the gear racks Rl, R2, R3, etc. to normal by a mechanism which will be hereinafter described in detail.

The gear racks Rl, R2, R3, etc. and the impulse bars Pl, P2, P3, etc. actuated thereby are operated by a gearing mechanism connected to a motor spring 93, see Fig. 4. This motor spring is tensioned by the manual operation of a handle lever 9| secured as by a screw W2 to a disc member dc which is in turn secured to a gear sector |35 shown in Figs. 4, 5, 13 and 15 by a plurality of screws W this gear sector having a hub portion H mounted for free movement in the hub portion H2 of another gear sector 83, and the hub portion of gear sector 8B is mounted for free movement in a bearing |31 formed integrally with a mounting plate 96, this plate being secured to side flange 21 by screws CRI and CRZ.

The movement of gear sector |34 in the direction indicated by the arrow in Fig. 4 is imparted to gear sectorv 08 through a projection |35 and the angular movement of gear sectors 88 and |34 is limited in the direction indicated by the arrow by a stop 90 engaged by the gear sector 88 and in its return movement Yby a stop 89 formed with plate 95 engaged by the gear sector 88. The movement of gear sector ,88 and gear sector |35 in a counter-clockwise movement as imparted by the operation of handle 9| is effective to rotate a pinion 32 and the gear sector |33 respectively. Y The turning movement of pinion 92 rotates the ratchet wheel 93 and tensions the motor spring 90, which has the end of its outer convolution secured to a lug 95 formed with the mounting plate 35 and the end of its inner convolution to the hub of ratchet wheel 93. The return movement of pinion 92 andthe ratchet wheel 93 carried.- thereby under the tension of motor spring 94 is effective to rotate a gear 91 through the engagement of pawl 98 carried by the gear 91 with the ratchet wheel. S3 under the tension of a spring |00, the turning movement of gear 91 being effective to actuate a centrifugal governor 10| through a pinion |02 and worm gear |03, in turn engaging the worm |04 formed with governor shaft |05 thus controlling the return movement of gear 91 under the tension of motor spring 94.

The turning movement of main gear 91 rotates a hollow shaft |08, see Figs. 8 and 15, through the intermediary gears |06 and |91 the latter being secured on the end of hollow shaft E08 bya set screw se.

The hollow shaft |58 which is rotated seven turns for each turn of gear 91 is journaled at both ends in

side flanges

23 and 21 and on this shaft is loosely mounted a plurality of gears G|, G2, G3, G0, G5, G6 and G1 disposed in operative relation with gear racks Rl, R2, R3, R4., R5, R5 and R1, respectively.

The gears G|, G2, G3, etc. are provided with slidable clutch pins SI, S2, S3, Sil, S5, S3 and S1 for engaging a slot or key-way |39 in the hollow shaft |53 for imparting movement to the gear racks Rl, R2, R3, etc. and thereby to the pulsing bars Pi, P2, P3, etc., the engagement of clutch pins Si, S2, S3, etc. in the key-way |09 being effected successively through the operation of a camming mechanism, which will be hereinafter described in detail.

In the hollow shaft |03 is mounted for axial movement therein a shaft H0 having camming portions as ci, c2, c3, cs2, c5, c5 and c1, shown in Figs. 8, 9 and 1l tted in the key-way |39 of shaft |08 and disposed in engageable relation with the clutching pins Sl, S2, S3, etc. of gears G|, G2, G3, etc. for disconnecting these gears from the shaft |08 under control of a cam Eli formed at the end of hollow shaft |38. The length of the eective portion of this cam is of the order of degrees and is engaged by a roller H2 carried by a lever I3 pivoted on a screw 220 shown in Figs. 5 and 13. Lever i3 is provided at its free end with two diametrically disposed screws I l and H5, the ends of which engage a collar H3 formed in one end of shaft H0 so that each turn of hollow shaft |38 as imparted by the gearing mechanism, above described, the cam il l inV cooperation with a retractile spring |2| is effective to impart a back and forth axial movement to the shaft H0 for disengaging any one of the pins SI, S2, S3,

etc. which may have been engaged in the key-way |09 of hollow shaft |08.

The engagement of pins Si, S2, S3, etc. with the slot |09 of shaft |03 is controlled by individual lever members Li, L2, L3, Ld, L5, L3 and L1 shown in Figs. 5, 6 and 7 through the cooperation of two cam shafts ||1 and H8 rotatably mounted on the

flanges

26 and 21. Cam shaft I |1 is operatively connected to the hollow shaft |08 through the intermittent or Geneva gears |20 and 50. The driver gear |33 which is secured to the end of hollow shaft 58 in cooperation with gear |20 on shaft i1 imparts 1/7 of a turn to this shaft for each turn of shaft |08.

The cams xl, m2, x3, x4, 3:5, x5 and .t1 of shaft l1 are in the form of discs each provided with a ratchet-shaped tooth as RT shown in Figs. 5, 6, '1, 15 and 16 disposed inequal angular relation on the shaft l l1 thus permitting the successive operation of clutch pins Sl, S2, S3, etc. following each complete turn to cam shaft ||1 for operatively connecting they gears G| G2, G3, etc. to. hollow shaft |08 subsequent to the release of the levers L|, L2, L3, etc. by the operation of cam shaft I8 as will be hereinafter described in detail.

Cam shaft IIB is actuated in a, step-by-step movement upon the successive operation of key members Kl K2, K3, K4, etc. through the operation of a ratchet Wheel 22 secured at one end of a shaft I6 I, see Figs. 4, 6, 13, 14 and 15 as effected by a pawl |23 pivoted at the free end of an arm |24 which is in turn pivoted on a shoulder screw |25 and connected at its free end portion to the lower disposed end of a link member |26, this link being connected at its upper end portion to the U-shaped yoke 54 as by screw |21.

The movement of ratchet wheel I 22 as effected by the pawl |23 is transmitted to the cam shaft I8- through a gear |62 securely mounted on shaft 26| and engaging the gear |53 keyed on shaft I8, the gear ratio between gears |63 and |62 being such as to impart 1/7 of a turn to cam shaft 8 for each tooth of ratchet wheel |22 for each digit key operated.

Pawl 23 as shown in Fig. 4is normally held in disengaged relation from the ratchet wheel 22 through an extension XT of this pawl engaging the under surface of a stop |28 so as to permit the return movement of this wheel and that of cam shaft II 8 to normal position under the tension of a retractile spiral spring |39 shown in Figs. 4, 5 and 14 upon the release of the ratchet wheel |22 by a spring-pressed retaining pawl |29 provided for holding this ratchet wheel in each advanced position.

As above described, the successive operation of the key members KI, K2, K3, etc. imparts a stepby-step unidirectional movement to cam shaft I3 through the movement of U-shaped yoke bar 54, the connecting rod |26 attached at one end thereto, the lever |24 attached at the other end of rod |26 and the pawl |23 carried thereby engaging the ratchet wheel |22 on shaft 25|, thus rotating the gears |62 and |53 and the cams N|, N2, N3, N4, N5, N5, and N1 in the form of discs having different numbers of projections at their peripheries disposed in angular spaced relation so that the iirst key member which may be depressed for the transmitting of a given telephone designation will release the lever LI, the second key the lever L2, the third key the lever L3, etc., for permitting the successive operation of these levers under the tension of their retractile springs CT and thereby the engagement of clutching pins SI, S2, S3, etc.- carried by gears G|, G2, G3, etc. with the sleeve |08 in the sequence determined by the operation of cam shaft I1. These clutching pins are frictionally held in operated position by similar springs SP shown in Figs. 5, '7, 12 and 13V so that a rotary movement of the hollow shaft |08 is effective to rotate the gears GI, G2, G3, etc. as the case may be for imparting a longitudinal movement to their respective gear racks RI, R2,l

R3, etc., a distance corresponding to a corresponding number of pins 33 and the upward eX- tending portions 33Z of the impulse bars PI, P2, P3, etc.

On the top end of angular levers L|L2, L3, L4,

lill

L5, L6 and L1 is pivotally mounted one of the ends of the arms FI, F2, F3, F4, F5, F6 and F1 shown inFigs. 6, 7, 12 and to the free end of each of these arms is mounted a pawl Hl, H2, H3, H4, H5, H6 and H1, each resiliently held against a stop lug formed with each arm FI, F2, F3, etc. by the tension of similar springs a, the top disposed end of each pawl HI, H2, H3, H4, H5, etc. being normally disposed in engageable relation with the tooth of its respective ratchet wheel RWI, RWZ, RWS, etc., which are mounted in equal angular spaced relation on a shaft |10 shown in Figs. 6, '1, 15, 16 and 17. The shaft |10 is operatively connected to the driving gear 91 through a pinion |1| securely mounted on gear 91 and engaging a similar pinion |12 mounted on the shaft |10. The other ends of springs a which are secured to arms FI, F2, F3, etc. rest on a projection |13 formed with the rear flange 25. Each of these springs is disposed in engageable relation with a common plate 200 having an extending arm 20| best seen in Fig. 6 provided for engaging a star Wheel |6| carried by a shaft |05 of a centrifugal speed governor |0| for preventing the operation of the pulsing mechanism against the tension of motor spring 94 under conditions which will be hereinafter described in detail, the speed governor being actuated, as above described, by the main gear 91 through a pinion |02 and a worm wheel |03 keyed on the spindle portion 206 of pinion |02.

The pawls HI, H2, H3, etc. may be moved cut of engageable relation from the one tooth ratchet Wheels RWI, RW2, RWS, etc. on shaft |10 by cams as DCI, DC2, DC3, etc. on a shaft 201. This shaft is rotated by a knob 208, shown in Figs. 1, 2, 3, 5, 13, secured to the top disposed end of a vertical shaft 299 in turn operatively connected to shaft 201 by bevel pinions 2|@ and 2| The movement of shaft 201 as defined by the movement of knob 208 in registry with one of the

digit numbers

1, 2, 3, 4, 5, 6 and 1 printed on a dial 2|2 on the casing 22 is effective to move as many pawls HI, H2, H3, etc., out of operable relation from the ratchet wheels RWi, RW 2, RW3, etc., as the number selected on the dial 2|2, the conditioning of the pawls HI, H2, H3, etc. permitting the stopping of the motor mechanism following the pulsing operation of the transmitter in response to each key depressed in a call designation of less than seven digits and to permit the running'down of the motor mechanism following the transmission of the last digit comprised in that call designation. A resetting mechanism operated by the handle lever 9| is provided for returning the pulsingbars P P2, P3, etc. to normal together with their actuating gear racks Rl, R2, R3, etc. following the transmission of each telephone call designation. In this resetting mechanism the operation of handle lever 9| and therefore that of the gear sectors |34 and |33 `is effective to disengage the pawl |32 from ratchet Wheel |22 so as to permit the cam shaft i I6 actuated thereby to return to normal unoperated po` sition under the tension of spiral spring |39. The gear sector |33 is secured at one end 'of a shaft |40 journaled at that end in a bearing portion 4| formed with the base 20 and its other end in a bearing portion in the flange 26. A pair of lever arms |42 and |44 best seen in Fig. 14 are secured on the ends of shaft |40 and the free ends of these arms are operatively connected to similar levers |44Y through bell cranks IdX, while the Vfree ends of levers |44Y are connected to the pivot portions of bar |46 by similar links IMW,

the bar |56 being mounted for sliding movement on the guiding bars bl, b2, b3, b4, etc. so that the movement of gear sector 533, as effected by handle 9|, is eiective to return to normal the gear racks RI, R2, R3, etc. and thereby the pulsing bars PI, P2, P3, etc., collectively, to normal starting position as shown in Figs. 3 and 7.

The movement of lever |38A in the reset position, as sho-Wn in Figs. 3, 4 and 6, the arm |5| actuates a plate |53 through the arm |52 of the plate for moving a roller |54 in engageable relation With the camming arm 85A of leverBE for pivoting this arm in the direction indicated by the arrow during the return movement of rack Rl, R2, R3, etc. and their associated pulsing bars bi, bz, b3, etc. to normal and thereby causing the operation of plate 66 for disengaging the pawls 62 and 59 from

racks

63 and 51 so as to permit the return to normal resetting of carriage 5| and simultaneously moving the pins 33 to normal non-operated position.

Upon the manual movement of lever |38A into the position marked repeat, that is, in the position shown in dotted lines in Fig. 4, the movement of arm |5| carried thereby is imparted to arm |52 for moving the plate |53 and the roller |54 out of engageable relation from the camming surface 85A of lever 5 so that the operation of handle lever 3| and gear sectors |34 and |33 actuated thereby is effective to return the gear racks Rl, R2, R3, etc. and their associated. pulsing bars bi, b2, b3 to normal, but the lever 85 and therefore the plate 66 are not operated and the pins 33 previously set remain in their adjusted operated position so that the tensioning of motor spring 9d through the operation of handle 3l causes the operation of pulsing bars b1, bz, b3, etc. in the manner above described without requiring the resetting oi the key members Kl, K2, K3, etc. previously set for repeating the transmission of the call.

A manually operable lever |55 is pivoted as on a screw |51 on an upright supporting member |55 shown in Figs. 3, 4, 6 and '7 formed with the base 23 and the lower end portion of this lever is connected to a longitudinally movable rod |53 supported at its free end portion in a guiding lug |59 formed with the base 2u. The rod |58 is provided with an upright extending lug portion 25S for engaging ia star wheel 56| carried by the governor shaft l for preventing the operation of the transmitter mechanism under the tension of motor spring 94, thus permitting the setting of all the key members Ki, K2, K3, etc. representing a given telephone number prior to the operation oi the transmitter, the release of the governor being eiected by the movement of the manually operable lever member 55 adjacent the word rel-ease, as shown in Figs. 1 and 2.

In a. typical Vexample of operation as for transmitting the telephone call designation 6234652 by the so-called key-by-key pulsing operation of the transmitter, the knob *ttt is moved in registry on 'the No, 'l printed on dial 212, as shown in Fig. 2, signifying a seven digit call, the movement of this knob being elective to rotate the shaft 263 and thereby the cam shaft 2i?? in position ineffective `relative to pawls Hi, H2, H3, etc. so as to permit the locking of the pulsing mechanism following its operation in response to each lrey depressed as will be hereinafter described in detail.

Lever |55 is moved in the Vreleased position so as to permit the immediate starting operation of the pulsing mechanism following the setting of the first key in such designation while lever |33A is moved in the reset position shown in Fig. 1, so as to prepare the resetting mechanism for returning the gear racks R|, R2, R3, etc., the pulsing bars or elements P|, P2, P3, etc. and the digit pin 33 to normal operated position, such resetting mechanism being operated by the movement of handle 9| simultaneously with the tensioning of motor spring 54.

The operation of key K5 representing the first digit of the call designation 6234652 above-mentioned, is effective to operate its respective camming bar B5 and thereby thespring retracted pin YE, now in operative relation with this bar, Figs. 3, '7, 12 and 18 for moving the corresponding stop pin member 33 in the path of lug 33Z of camming or pulsing bar PI With the pulsing bar Pl, P2, P3, etc. the gear racks RI, R2, R3, etc. and therefore the respective driving gears Gl, G2, G3, etc. in normal position as shown in Figs. 7, 8, 9 and 15, the clutch pins Sl, S2, S3 carried by gears G|, G2, G3, etc. are disposed in operablerelation with their respective angle levers Ll, L2, L3, Lil, etc. and in engageable relation with the groove |59 of hollow shaft ISB, the operation of each angle lever LI, L2, L3, L4, etc. being in turn controlled by respective cam wheels 33|, x2, x3, etc. and similar retractile springs CT.

The motor spring 94 is normally prevented from actuating the gears Gl, G2, G3, G4, etc. due to the pawl H| at the free end of arm FI, beingengaged with its respective wheel RWl and normally maintaining the spring d carriedv by arm FI flexed as shown in Fig. 16 for holdingV the plate 2&9 and its lug portion LP in engagement with the star wheel |5| carried by governor shaft. |05. Upon the operation of the first key member K6, above mentioned, and the consequent stepping movement of shaft H8, as effected by ratchet wheel |22, the angle lever LI is moved by its retractile springs CT in position wherein the clutching pin S! of gear Gi is moved in the groove of hollow shaft |58 while simultaneously disengaging the paw] HI at the end of arm Fl from its one-toothed ratchet wheel RWI to causey the springv a to return to its normal position under the medium of its ownresiliency and thereby pivoting the plate 203 for moving its lug LP out of engagement from the `star wheel I'l, thus permitting the operation of hollow shaft |33 and gear Wheel Gi clutched thereto. The rotation of gear wheel Gl through the rotation of hollow shaft. |08 as effected by the engagement of gear lill, with pinion |06 and the engagement of this pinion with main gearll'l is effective to impart a longitudinal. movement to the gear rack RI from the position shown in Fig. '7 to the position shown in Fig. 12 frictionally carrying with it the pulsing element PI through the tension of spring 29. Thepulsing bar Pl is arrested in its movement due to the engagement of its lug 33Z with the depressed pin 33 as eiected by key Kil While the gear rack R| continues its movement until the clutchingpin of gear Gl is disconnected from hollow shaft |58 by the sliding movement of shaft lli! whichmovement is imparted by the cam on the sideof gear |531 in cooperation with lever ||3 and retractile spring |2| shown in Figs. 8, 9 and 10 and timed to occur following each half turn of gears GI, G2, G3, etc., but the engagement of the succeeding clutch pins carried by the gears is timed to occur following each complete turn of hollow shaft |28 when the groove |39 of this shaft is again in registry with clutching pins S2, S3, S4, etc. thus providing a so-called inter-digit space between each set of pulses as eifected by the movement of pulsing elements P|, P2, P3, etc.

` Supposing now that key K2, the second digit of the call kdesignation 6234652, above mentioned, has not been depressed. In that condition the angle lever L2 is held from movement by its cam N2 on shaft ||8 while the pawl H2 at the end of arm F2 is engaged by its one-toothed ratchet wheel RW2 in the manner described in connection with pawl Hl for ilexing its spring a and thereby imparting a downward pivotal movement to the common plate 200 for engaging its lug portion LP with the star wheel |6| and thereby preventing the operation of the motor mechanism which is released upon the operation of key K2, this cycle of operation being repeated for each digitto be transmitted in the call designation above mentioned.

supposing now that key K2 was depressedrprior to the completion of the operation of the transmitter mechanism for transmitting the six pulses in response to the operation of key K6, the cam N2 on shaft ||8 which is actuated a second step by key K2 releases the angle lever L2 so as to permit the engagement of clutch pin S2 carried by gear G2 with the groove |69 of hollow shaft |68 under control of its cam wheel r2 and prevents the locking of the governor shaft as above mentioned in connection with angle lever Ll. 'I'he operation of any one of the keys as in this example keys K2 and K6 in addition to the setting of stop pins 33 in the path of pulsing racks P|,'P2, P3 as the case may be is effective to impart a pivotal movement to the yoke lever member 54, see Figs. 5, 7 and 14, and thereby a pivotal movement to the angle-shaped lever 58 having its downward extending arm loosely conneted to one end of the saw-toothed rack l, the other end of this rack, as above described, beingloosely connected to the arm 55, pivoted to alug extending perpendicularly from the side flange 26, the spring ST serving for returning the rack 51 to normal position, as defined by the yoke 54 normally bearing against the under surface of the keys KI, K2, K3, etc. when each of these keys are in normal non-operated position, so that the movement of rack 51 by the operation of any one of the keys is effective to engage the tooth TI, for example, of this rack with pawl 59 Von carriage bar 5| so that uponthe return movement of the operated key to normal, the retractile spring ST causes the movement of rack 5'|.for moving the carriage 5| in position for placing the spring retracted pins Y| Y2, YS, etc. in axial alignment with the succeeding row of stop pins 33 preparatory to the operation of the succeeding key 'as in this example key K3.

Uponthe last digit transmitted when the gear sector 88, Figs. 4 and 14, and |34 are arrested in their operated position due to gear sector 8S engaging the stop 83, the transmitter mechanism is now ready for a succeeding operation which is effected bythe operation of lever 9| for returning the gear sectors |34 and |35 to normal unoperated position, the movement of lever tensioning'themotor spring 94 while Athe movement of gear sector |34 actuates the gear sector |33 for imparting a small angular movement to shaft |49 ,and to the arms |42 and |44 carried thereby for returning the camming or pulsing bars Pl, P2, P3, etc. to normal unoperated position through the movement of bar |46 connected to arms |42 and |744 on shaft |49 by the links |44X, the lever arms |44Y and links 44W.

The movement of gear sector |33 is eiective to impart a longitudinal movement to pawl |3| for dsengaging the pawl |29 from ratchet wheel |22 for permitting the returning of the camming shaft |8 to normal position through gear |62 on shaft 26| and pinion |63 on cam shaft ||8 as eiected by the tension of the spiral retractile spring |33.

The placing of lever |38A in the reset position, as above described, imparts a small angular movement to the plate |53 through its arm |52 for moving the roller |54 in operative relation with the cam surface A of fork-shaped lever 85 whereby the movement of bar |46 is eifective to impart a pivotal movement to this lever and an upward movement in the plate 66 due to the engagement of the free end of arm 85 with the camming portion 86 of the plate 66 and its arcuated movement as generated by its connecting links 61, 68, 69 and 8D, thus returning the operated stop pins 33 to normal. The bar |46 is returned to normal as shown in Figs. 2, 3, 4, 6, 7, 12 and 14 automatically by the tension of spring 250 having one of its ends connected to upright |56 extending from base 29 and its other end to the gear sector |33 on shaft |40, the return movement of gear sector |33 by spring 250 being eiective to return the gear sector |34 and the handle 9| to the unoperated position while the gear sector |35 remains in the operated position against the stop 99 with the motor spring 94 tensioned preliminary to succeeding call designation transmitting operation.

'supposing now that it is desired to transmit the call designation 6234652 by the so-called present operation of the transmitter and that it is desired to repeat such a call in the event that the called telephone substation is found to be busy. According to the transmitter of the invention, the lever I38A is moved to the repeat position and lever |55 to the prese position. The movement of lever |55 to the preset position is effective to impart a longitudinal movement to the bar |58 for engaging its upward extending end with the star wheel |6| on governor shaft |95, see Fig. 4, thus permitting the setting of all the keys in the manner above described without causing the starting operation of the motor mechanism which may, however, be started at any time by returning the lever |55 inthe released position and thereby moving the bar |58 and its lug portion 230 out of engaged relation from star wheel |6|. supposing now that the call telephone designation 6234652 is busy and that it is desired to repeat such a call. The movement of lever |38A-to the repeat position, as above described, imparts a pivotal movement to the plate |53 for moving the roller |54 out of engageable relation from the camming surface 85A of fork lever 85 so kthat the movement of bar |46 as for resetting the impulse bars PI, P2, P3, etc. is ineifective to operate the plate 65. Therefore the stop pins 33 previously set in position for transmitting the call designation above mentioned are not returned to normal during the tensioning of the motor spring 94. The cam shaft ||8, however, is returned to normal starting position upon the disengagement of pawl |29 from ratchet wheel |22 and therefore is ineffective relative to angle levers LI, L2, L3, L4, etc. during the repeat operation of the transmitter and the reengagernent of clutching pins SI, S2, S3, etc. by levers Ll, L2, L3, L4, etc. is now under control of the wheel XI, X2, X3, etc. on shaft which is driven by intermittent gears |60 and |20.V

According to this mechanism, a certain telephone call designation may be repeated any number of times by the tensioning of the .motor spring through the operation of handle 9|.

supposing now that it is desired to transmit a call designation of less than seven digits, the knob '2&8 is moved on the Nos. l, 2, 3, 4, 5, 6 and 7 as the case may be for rotating the cam shaft 20?. The operation of this shaft causes a pivotal movement of pawls X1, X5, X4, X3, X2, Xl in number corresponding to the number of digits selected for moving them out of engageable relation with their corresponding one-toothed ratchet wheel RWI, RWS, RWS, RW4, RWS, RW 2 and RWI. Under this condition the pawls Hl, H2, H3, H4, etc. which have not been moved out of engagement from their one-toothed ratchet wheel Rl, R2, R3, R4, etc. operate in the manner above described in connection With the key-by-key digit transmitting operation, but the paWls R'i, R5 and R5 which have been moved in position out of engageable relation with their one-toothed ratchet Wheel permits the continued movement of the driving mechanism following the number of digits transmitted as defined by the position 0f knob 268 until the gear sector 83 is arrested by 'its stop |35 engaging gear sector 13E in turn normally resting against stop 89 as previously described.

What is claimed is:

1. In a call transmitter, a set of pivoted key members, a plurality of pulsing cam bars, a gearing mechanism and a friction drive for each of said bars for moving them longitudinally, a motor for actuating said mechanisms, clutching devices operable for operatively connecting said gearing mechanisms to, and disconnecting said gearing mechanisms from, said motor for imparting to each of said mechanisms a predetermined movement, means operated by said key members for controlling the extent of movement of said 'bars relative to the operation of said mechanisms and a Contact actuated by the operation of any of said bars.

2. In a call tr vsmitterl a set of key members, bars actuated by said members respectively, spring retracted 'plungers lactuated vby 'said bars respectively', a meter mechanism, longitudinally movable pulsing elements actuated by said motor, and normaliL ineffective stop means positioned by the operation of plungers by said bos for controlling the longitudinal operation ci pulsing elements.

3. In a call transmitter, a motor, a set of key members, a plurality vof longitudinally movable pulsing elements, a contact actuated by the succe sive movement of each of Said elements, a clutching mechanism geared to said motor vfor succcssiveiy actuating said elements. means actuated by the operation of said key members for stopping the operation of said longitudinally movable pulsing elements during the continued operation of said mechanism by said motor, and manually operable means for returning said elements to normal position collectively following the successive operation of said contact by said elements.

4. In a call transmitter, a plurality of longitudinally movable pulsing cam elements, a contact, means disposed in operative relation with each of said pulsing elements for actuating said Contact, driving gears, racks movable longitudinally by the movement of said gears for actuating said elements, a common shaft for rotating each of said gears but normally ineffective thereto,

clutch mechanisms for successively operatively connecting said gears to `said shaft for lactuating said pulsing elements, a system of cam shafts and lever members for controlling the operation of said clutch mechanisms, a fixed mounting, a plurality of stop pins arranged in coordinate rows i-n said mounting, a carriage, a row of plunger members mounted on said carriage, a set of key members, means actuated by said key members for moving said plunger members and said stop pins in position for determining the operation of said contact by said elements, and a motor -for actuating said shaft and said cam shafts.

5. In a call transmitter, a plurality of longitudinally movable pulsing elements, a contact, means disposed in operative relation with each of said elements for actuating said contact, driving mechanisms for said elements each comprising a clutching means, a set of key members, means actuated bysaid key members for dening the extent 4of operation of each of said elements, a motor, a cam shaft actuated by said motor, a cam shaft actuated by the operation of each of said key members, means actuated by the conjoint operation of said cam shafts for successively operating said clutching means to cause the successive operation of said elements, a speed governor for controlling the operation of said motor, another Vcam 'shaft actuated by said motor and a lever mechanism actuated by the last-mentioned cam shaft for stopping the operation of said speed governor following lthe operation of said elements.

`6, In a call transmitter., a plurality of key members, pulsing elements, means actuated by the operation of said 'key members for controlling the operation of said elements, a motor, a shaft geared to .said motor, a gear Wheel for each of said elements loosely mounted on said shaft, a clutchirifI pin carried by each of said gears, said shaft having a clutch element common to said clutching pins, a cam shaft actuated by the operation of each of said key members, a cam shaft geared 'to said motor, lever members operatively associated with :said clutching pins and operable upon the conjoint operation of said cam shafts for successively engaging said clutching pins with said clutch element for operation of said pulsing elements, a pulsing contact, and a pivoted member actuated by the movement of each of said elements for `operating said contact.

7. In acall transmitter, a plurality of key members, a plurality of longitudinally movable pulsing elements, a gear rack for each of said elements, friction drives operatively connecting said pulsing elements to said gear racks, a row of normally ineffective stopping members for each of said element-s, means operable by the movement of each of said key members .for setting one of said stopping members in each of said rows for predetermining the extent of movement of said pulsing elements, a motor spring, a rotatable shaft connected to said motor, gears for actuating said racks mounted free on said shaft, means for individually and operatively connecting each of said gears to said shaft to cause the operation of saifl elements to point-s determined by the posiof said stopping members, means actuated by said for successively disconnecting said each 'of said gear racks and a contact actuated ty the movement of each of said elements.

8. In a call transmitter, a set of key members, a plurality of pulsing elements, means set by the operation of said key members for defining the .rs from said shaft following the operation ofA operation of said elements, a motor, a rotatable shaft actuated by said motor, gears for said pulsing elements mounted cn said shaft, normally ineffective clutching devices for operatively connecting said gears to said shaft for actuating said elements, a cam shaft actuated by the operation of each of said key members, a cam shaft actuated by said motor, a plurality of lever members operated by the conjoint operation of said cam shafts to render said clutching device effective relative to said gears, a speed governor for controlling the operation of said motor, and a twoposition manually operable means movable in one position for locking said governor shaft against movement for permitting the operation of a plurality of said key members prior to the operation of said motor and in the other position releasing said motor.

9. In a call transmitter, a set of key members, pulsing elements, a contact actuated by the operation of each of said elements, a plurality of rows of stopping members normally ineffective relative to said elements, a carriage, a row of spring retracted plunger members mounted on said carriage, a ratchet mechanism actuated by each of said key members for moving said carriage step by step for successively positioning said plunger members inoperative relation with each row of said stopping members, means actuated by the operation of each of said key members during the Y ineffective stroke of said ratchet mechanism for setting one of said stopping members in each of said rows in position effective relative to said pulsing elements for controlling the operation of said contacts, a motor spring for actuating said elements, means for tensioning said springs, and means operated upon the tensioning of said spring for collectively resetting said elements to normal.

10. In a call transmitter, a set of key members, a contact, a plurality of pulsing elements, means actuated by the operation of said key members for controlling the extent of movement of said pulsing elements for operating said contact according to the digit values represented by the operation of said key members, a rotatable shaft, a motor for operating said shaft, gears for said pulsing elements supported by said shaft, said shaft having a clutch element, a clutch element carried by each of said gears for engaging the clutch element of said shaft, a camming mechanism for successively engaging the clutch elements of said gears with the clutch element of said shaft for imparting movement to said pulsing elements for actuating said contact, and manually operable means for negativing a predetermined operation of said camming mechanism for permitting the continued operation of said motor to normal position following the transmission of a number of series of pulses corresponding to the number of the operated key members.

11. In a call transmitter, a set of key members, a plurality of pulsing elements, a contact, means actuated by the successive operation of said key members for controlling the extent of movement of each of said pulsing elements, gears for actuating said elements, a common shaft for each of said gears having a clutch element, a clutch element carried by each of said gears for engaging the clutch element of said shaft, a cam shaft operated by the operation of said key members, a

cam shaft operated by said motor, lever members operated by the conjoint operation of said cam shafts for controlling the engagement of each of said clutch elements with the clutch element of said shaft for operating said contact, another cam shaft actuated by said motor, and means actuated by the conjoint operation of said manually operable cam shaft and the last-mem tioned cam shaft for stopping the operation of said motor following the transmission of each successive train of pulses according to the operation of said key members.

12. In a call transmitter, a set of key members, a contact, a plurality of pulsing elements for actuating said contact, means actuated by said key members for controlling the extent of movement of each of said pulsing elements, gear mechanisms for actuating said elements, a driving shaft common to said gear mechanisms but normally ineffective thereto, means for successively operatively connecting said gear mechanisms to said driving shaft, said means comprising a plurality of lever members, retractile springs for said levers, a cam shaft for successively operating said levers under the tension of said springs, a cam shaft operated by the movement of each of said key members for determining the number lof said pulsing elements to be operated for transmitting trains of pulses according to the values cf the digit keys operated, and a plurality of means operable in one position for transmitting such pulses in response to the successive operation of said key members and in another position by the preset operation of said key members.

13. In a call transmitter, a contact, a plurality of pulsing elements for actuating said contact, a set of key members, a plurality of rows of stopping members selectively actuated by the operation of said key members for determining the extent of movement of said pulsing elements, a motor, a shaft operatively connected to said motor, said shaft having a clutch element, a plurality of gears mounted on said shaft, each having means for engaging said clutch element, mechanisms for effecting such engagement, said mechanism comprising a lever member for each of said means, a manually operable lever mechanism, a cam shaft operated by said mechanism for predetermining the engagement of said clutch elements relative to the clutch element carried by said shaft, a cam shaft actuated by said motor cooperating with the first-mentioned cam shaft for permitting the successive automatic engagement with said clutch elements for causing the successive operation of said gears for actuating said pulsing elements, a ratchet shaft actuated by said motor in timed relation to the first-mentioned cam shaft, arms carried by said levers, pawls carried by said arms successively engaged by said ratchet shaft for stopping the Y operation of said motor following the operation JOHN G. ROBERTS. CHARLES D. RICHARD.