US2100390A - Call transmitter - Google Patents

Description

Nov. 30, 1937. H w. GOFF 2,100,390

CALL TRANSMITTER Filed Feb. 1a, 1957 s Sheets-Sheet 1 FIG./

DIRECTORY lNl/EN 70/? H. n. 6 OFF ATTORNEY Nov. 30, 1937. H. w. GOFF CALL TRANSMITTER Filed Feb. 18, 1957 6 Sheets-Sheet 2 lNl EN TOP 0 H. W 60F F ATTORNEY Nov. 30, 1937. H w GOFF 2,100,390

CALL TRANSMITTER Filed Feb. 18, 1957' 6 Sheets-Sheet 3 50 FIG. 3 //a 47 62 as B 52 2 49 /46 6/ INVENTOR H. W. GOFF ATTORNEY Nov. 30, 1937. H. w. cor-"F CALL TRANSMITTER 6 Sheets-Sheet 6 Filed Feb. 18, 1937 FIG/9 FIG/8 INVENTOR H. W. 6 OFF KczQi 94 ATTORNEY Patented Nov. 30,1937

UNITED, STATES CALL TRANSMITTER Harold W. Goff,

Great Neck, N. Y., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application February 18, 1937, Serial No. 126,416 '10 Claims. (01. 179-90) This invention relates to call transmitters of the so-called repertory type which are used in automatic telephone exchange systems to simplify the dialing operation of a predetermined number of frequently called telephone designations.

It is an improvement over the call transmitter disclosed in Patent 2,036,037 to H. W. Golf, dated March 31, 1936.

' In that patent a manually operable crank is provided for rotating a screw for moving a feeler member in selected position with respect to a plurality of discs, each having peripherally disposed teeth which are removed to form notches representing a certain telephone number, these discs cooperating with a star wheel for reciprocating a lever mechanism which in turn moves nor-' mally non-effective pulsing and shunting rotating camming members in a path foractuating re-' spectively associated contact elements, according to the character of selected discs or the number of teeth removed from the periphery of the selected disc, the discs being keyed to a supporting shaft which is actuated by a motor spring tensioned by the operation of a manually operable lever member.

According to the present invention, the manual operation of a knob disposed outside the transmitter housing is effective to rotate a sprocket wheel formoving a chain in .a line parallel to a shaft provided for guiding an index member in juxtaposition to the face of a dial on which the names of a certain number'of telephone subscribers are printed, such operation being effective to simultaneously move a feeler supporting arm in operative relation with the code disc thus selected which corresponds to the name of the telephone subscribers desired. Means operable upon the tensioning of a motor spring is provided for looking the selecting mechanism and the feeler supporting arm in the selected position during the operating of a pulsing mechanism. Means actuated by the operation of the motor mechanism cooperates with the selected code disc for imparting reciprocating movement to a' cam for moving pulsing and shunting camming elements in a path for actuating the pulsing and shunting springs according to the code disc bearing the designation of the telephone subscriber desired. Means is provided for yieldably holding the code discs in spaced relation on their supporting shaft with means movable upon theoperation of the selecting mechanism for selectively positioning such operable means in engaged relation with the-selected disc for removing such a disc from 55 the supporting shaft m replacement by another disc bearing a different telephone call designation.

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

Fig. 1 is a front elevation of the call transmitter of the invention; Y

Fig. 2 is a right-side elevation view showingthe casing with portions cut away;

Fig. 3. is a, front assembly -view of the mechanism showing a number of operating parts with portions cut away;

Fig. 4 is a partial view showing the code discs and their locating bar in normal position;

Fig. 5 is a cross-sectional view taken on line 55 of'Fig. 3 showing the pulsing mechanism, the casingbeing shown with portions cut away;

Fig. 6 is a cross-sectional view taken on line 66 of Fig. 4; 1

Fig. 7 is a partial view showing the pulsing mechanism with the pulsing and shunting cams in the normal non-operated position;

I Fig. 8 is a view similar to that of Fig. '7 showing a number of pulsing and shunting cams in the operated position;

Fig. 9 is an end view of Fig. '7;

Fig. 10 is an end view of Fig. 8 showing the pivoted'cam in the operated position; Figs. 11 and 12 are detail views;

Fig. 13 is a view of a. code disc blank shown in perspective;

Fig. 14 is a cross-sectional view taken on line l4l4 oiFig.7;

Fig. 15 is a detail view of the pulsing mechanism-showing their supporting element in section;

Fig. 16 is a detail view of the 'feeler supporting member showing its operating connection with an arm of the selecting mechanism;

Fig. 17 is a view of a disc notched to represent a certain telephone designation;

Figs. 18, 19, and 20 are diagrammatic views of the cams used for controlling the operation of the pulsing mechanism;

Fig. 21 is a detail view of the motor mechanism; and i Fig. 22 is a detail view of a 1001: used for preventing the operation of the selecting mechanism during the pulsing operation of the transmitters.

As shown in Figs. 2, 3, '4, 5, and 6 the side flanges 2n and 2| are welded at their lower and upper ends to the base 22 and plate 2 3, respectively to form a mounting frame for the transmitter mechanism which will be hereinafter described in detail. A housing for the transmitter mechanism is shown in Figs. 1, 2, and 5. It consists of a stand 200 formed with lugs and 202 for supporting the mounting frame thus formed in air" oblique relation with respect to the plane of stand 200 and to this stand are secured the ,7

left and. right side portions 203 and H4 and front and rear portions 204 and 205, respectively. At their upper disposed ends the casing portions 204 and 205 are provided with downwardly extending arms 206 and 201 for securing these portions to the top plate 23 in overlapping relation with the peripheral edges of side portions 203 and 4 as shown in Fig. 2 for holding them firmly to the plate 23.

At the lower disposed end of flange 2| is sesured a laterally extending spindle 24 shown in /Figs. 4 and 5 provided for rotatably mounting a sleeve 25. On one end of this sleeve is secured a gear sector 28 shown in Figs. 2, 6, and 211 and its other end is formed with a notch 21 provided for receiving a similar shaped tooth extending from the hub portion HP of a handle lever 28, this lever being held against axial movement on the spindle'24 by a screw 29.

On the bushing or sleeve is secured one end of a spiral spring 30, shown in Fig. 21, and the other end of this spring is hooked to a spring barrel 3| secured to a bracket 34 by screws 32 and 33, this bracket being in turn secured to the base 22 by screws 35 shown in dotted lines in Fig. 2. According to this construction, the movement of lever arm 28 from the position shown in Fig. 2 to a stop 36 secured to bracket 34 is effective to tension the spring 30 for rotating the gear sector 26 and thereby a pinion 31 shown in Figs. 2, 5, and 21 secured to the ratchet wheel 38, this ratchet wheel being in turn engaged by two spring-pressed'pawls 39 and 40 carried by a gear 4|. Gear 4| is mounted on a stud 42 secured on the flange 2| and meshes with a pinion 43 rotatably mounted on a stud ST and on the hub portion of this pinion is securely mounted a gear 44. Gear 44 in turn meshes with a pinion 45 shown in Figs. 3 and 5 secured on a shaft 46 journaled at one end in a bracket 41 secured to the under side of plate 23 by a number of screws 50 and its other end in a bracket 48 secured. to the flange 2| by a number of screws 49. The operation of gear sector 26 within the angular distance as limited by the stop 36 and a stop afforded by a pawl 5| shown in Figs. 2 and 6 and a pin I52 carried by gear 4| is effective to rotate the shaft 46 27 turns for a purpose that will be hereinafter described in detail.

On shaft'46, as shown in Figs. 3 and 5, is securely mounted adjacent pinion 45, a gear 52 which meshes with a pinion 53 on the hub 'of which-is securely mounted a gear 54, this gear engaging a pinion 55 secured to the shaft 56 of a centrifugal governor CG provided for controlling the speed of shaft 46 under the tension of motor spring 30.

On the shaft 46 is securely mounted a worm 51 and a star-wheel 96 having four cam-shaped teeth T1, T11, Ta, and T1 as shown in Figs. 2, 5, 7, Y

and 14 provided for reciprocating a bar 13 secured to the free endsof a pair of arms 91 and 98 in turn keyed on a rod 60, this rod being journaled atone end in the base 22 and its other end in the plate 23, while a spring hooked at one end to a bracket BI and .its other end to the bar 13' yieldably holds a shoe member 58 on a plate 63 (shown in Figs.

. sleeve portion carried by arm 91 in engaged relation with the teeth T1, T2, T3, and T1 of star-wheel 96.

The worm 51 meshes with a worm gear 6| secured to the upper disposed end of a vertically disposed shaft 62 journaled in the plate 23 and in the base 22, the lower end of shaft 62 terminating in a semispherical-shaped portion resting 3 and 4) secured to the under side of base 22 by a screw 64, while ,a collar 65 secured to the upper disposed end of shaft 62 prevents the axial movement of this shaft, the speed ratio between shaft 46 and the vertical shaft 62 being of the order of 27 turns of shaft 46 for one turn of vertical shaft 62.

The saft 62 is provided at its ends with disc members 66 and'61 which are secured thereto by screws 68 and 69 and a bar 10 shown in Figs. 3, 4, and 6 is secured at both ends to these discs by. screws 1| and 12. The bar 10 registers with the peripheral edges of discs 66 and '61 and engages the radial slots RS of code elements CD for readily locating them in their starting posi-'- tion with respect toa feeler supporting arm 14 actuated by the reciprocating movement of bar 13 as effected by the operation of star-wheel 96.

On shaft 62 between discs 66 and 61 is secured a mounting frame consisting of two substantially V-shaped comb members 16 and 11 having their lateral projections registering with each other for holding the code discs CD in equal spaced relation and perpendicular with respect to their supporting shaft 62 while springs such as 15 shown in Fig. 6 which are formed in the manner of the comb secured between the V-shaped comb members 16 and 11 serve for resiliently holding the code discs CD in centered relation with respect to shaft 62.

On shaft 46 is secured as by screws 19 a collar 18 shown in Figs. 3, '1, 8, and 15 formed with a and a disc portion 8|, which cooperates with a rim 82 also formed with the collars 18 for supporting a plurality of rods Y1, Y2, Y3 and Y4 and X1, X2, X3, and X4 shown in Figs. 9 and 10, the pins Y1, Y1, Y3, and Y beingsecured in indentations formed at the periphery of the ridge 82 and at the periphery of disc 8|, while the pins X1, X2, X3, and K4 are mounted for longitudinal movement in guiding holes in the collar 18 and in similarly spaced holes in disc portion 8|. On similar ends of the pins X1, X2, X1, and X1 are secured the camming members S1, S2, S3, and S4, respectively for operatin shunting springs for a purpose well known in the telephone art and on the pins Y1, Y2, Y3, and Y1 are slidably mounted camming members in the form of rollers P1, P2, P3, and P1 for operating pulsing springs as 94 in a manner that will be hereinafter described in detail.

The cams S1, S1, S3, and S1 which are secured at the ends of pins X1, &, X1, and X1 and the roller cams P1, P1, P3, and P1 are connected by pairs S1-Pi, S2--P2, S3-Pa, and S4-P-1 by U- shaped link members M1, M2, M3, and M4-S80111Ed. on movable pins X1, X2, X1, and X1 and slidably moving on the stationary pins Y1, Y2, Y3, and Y4. provided with projections Z1, Z1, Z3, and Z1, respectively for engaging once upon each turn of shaft 46 the cams 90, 9|, and a barriermember 92 shown in Figs. 9, l0, l4 and diagrammatically in Figs. 18, 19, and 20. w

The radially extending Z1 link members M1, M2,

The link members M1, M2, M3, and M1 are move in a vertical plane in position as indicated I by projections Z1 and Z1 in Fig. '7 wiQi cam rollpast the cam 9| ers P1 and P4 in position ineffective to operate the pulsing spring 94 and their associated segmentary shunting cams Si and S4 in position ineffective to operate the shunting spring 95. However, upon the turning movement of shaft 46 in a clockwise direction as indicated by the arrowsin Figs. 7, 8, and 9 and diagrammatically in Figs. 18 and 19 and with the movable cams 92 in the position shown in Fig. 19 the projections Z1, Z2, Z3,

and the pair of cams Pi-S1, Pa-Sz, Ps-Sa, 8nd Pi-S4 in a path for successively eng ing the pulsing spring 94 and the shunting spring 95 depending upon the operation of cam 92 as eflected by the conjoint operation of star-wheel 96- and transmitter housing.

e ment ofthe chain I I5 is eflective to posed for movement of the chain in the code discs CD in detail. Upon the continued turning movement of shaft- 46 and that of the projections Z1, Z2, Z3, and Z4 and assuming that the cam 92 is position shown in Fig. 10 and diagrammatically in Figs. 19 and 29, these projections travel to the left side of the stationary segmentalshaped barrier member 93 that is in position wherein the roller cams P1, P2, etc. and the segmental-shaped cams S1, S2, etc., respectiveengage the pulsing contact .94 and the unting contact 95, for operating them. Upon the continued movement of shaft 46 and therefore that of the projections Z1, Z2, etc., to a point where these projections engag the cam 9|, but with the cam 92 in the position shown in Fig. 9 and diagrammatically in Fig. 18 the projections Z1, Z2, Z3, and Z4 and the pulsing and shunting cams are moved back to normal position to the right side-of segmental barrier 93 and therefore in position ineffective to actuate the pulsing spring 94 and the shunting spring 95. The bar I3 as above described is operated by the turning movement of star-wheel 96 engaging the shoe member 59 mounted on the supporting as will be hereinafter described in the arm 91 of this bar. The supporting arm 91 is' formedv with an extension 98 shown in Figs. 3, 5, 8, and 11 terminating at its free end in a forkshaped portion 99 for engaging the upward extending arm portion I99 of movable cam 92, this cam being pivotally mounted on a stud I9I laterally extending from a bracket I92 in turn securedas by a screw I94 on a vertically extending projection I93 carried by or formed integrally with the flange'29.

A manually operable mechanism is provided for moving the arm 14 and the feeler member 12 carried thereby in selected position with respect to the code discs CD for signaling the desired telephone number, -such mechanism comprising a knob III shown in Figs. 1, 2, and 3 mounted on one end of a spindle I-I2 rotatably mounted in a bushing H3 secured to a stud member N4 of the On the other end portion of spindle H2 is securely mounted a sprocket wheel H4 provided for receiving a chain II 5, this chain engaging the sprocket wheels 9 and Ill 'disa plane parallel to the turning axis of shaft 62. A shaft 8 has its top disposed end engaging the plate 23' and its lower end is secured in the nut screw I I9 shown in Fig. 4. On this shaftis slidably mounted an arm I29 having a lug I2I engagingthe line-I22 of chain 5, as shown in i 2380 that the clockwise and counter-clockwise movement of knob III and the consequent movemove the arm 75 7 I29 along the vertically disposed shaft 8' for. a

and Z4 successively engage the cam ill for moving the links M1, M2, Nb, and M4 3 gutmpiilise which will be hereinafter described in An arm I23 shown in Figs. 5, 6, and 16 secured on arm I29 as by rivets I24 extends inwardly at right angles to the direction of arm I29 and in parallel relation with flange 2I. The arm I23 is provided with a stud I25 having a slot I26 engaging a lug I2I formed integrally with one of the bearing portions oi the lever I4 for moving this lever and the feeler member I2 carried thereby in operative or selected position with respect to the code discs CD on shaft 52, such positions being indicated by an apertured strip I28'secured at both ends to the arm I29 and moving adjacent the face of a dial I 29 slidably engaging the overturned edges of 'a mounting plate I39 shown in Figs. 1, 2, and 3 which is in turn secured to the base 22 by screws I 3i and I32 and at its upper disposed end to the plate 23 by a. number of screws I33 shown in Fig. 2.

A mechanism is provided for centering the arm I4 and the feeler member I2 carried thereby in each selected position with respect to the code discs CD. In this mechanism a carriage I24 which is slidably mounted on shaft H8 and fitted in the space between the bearing portions I35 and I36 of arm I29 is moved along the shaft II8 by a pin I31 shown in Fig. 4 carried by arm I 29 and engaging a slot I38 in the carriage I34. This carriage as'shown in Figs. 4, 5, and 615 formed with an arm I39 having a roller I 49 provided for engaging the teeth of a rack I under the tension of a ribbon-shaped spring I42 having one of its ends secured to the carriage I34 and provided at its free end with a roller I43 hearing against the rear side of rack I4I for resiliently holding the centering roller I49 in engaged relation with the rack II, this rack being formed at each end with hearing portions I45 and I46 shown; in Figs. 3 and 4 for pivotal movement on the shaft I I8 for a purpose that will be hereinafter described in detail.

The arm I29 as shown in Figs. 5 and 6 is formed with a engagement with the teeth of rack I4I when this rack is pivoted on the shaft II8 through the tension of a spring I69, when released by the operation of the gear sector 26 as imparted by the handle lever 28 in its movement from normal non-operated position shown in Fig. 2 to a position against'the stop 36 as for winding the motor spring 39, thuspreventing the selective movement of knob III when the'handle lever 28 is moved away from its normal non-operated position and during the pulsing operation of the transmitter. Upon the return movement of handle lever 28 and the gear sector 25 actuated thereby in the position shown in Fig. 2 following a pulsing operation the pin 52 carried by the gear 4! engages the shoulder portion I53 of pawl SI for imparting a sliding movement to angle lever I55 on its pivot I56 for pivoting the rack MI and thereby disengaging it. from the lug I59 of arm I29, thus releasing the arm I28 as to permit the selective movement of the army 14 and the feeler member I2 carried thereby with respect to the code discs the pulsing mechanism.

On the arm I23 is slidably mounted a manually operable index member I I9 which-is resiliently held in its normal non-operated position as shown in Figs. 5 and 6 by a retractile spring "I. The index member I19 is positioned in engageable relation with the selected disc tmough the selaterally extending lug I59 for I CD through the operation of knob III and simultaneously stopping -ment o! rack I4I with the wheels H6 and H1.

lective movement of arm 14. In that position the manual longitudinal sliding movement of index I10 is 'efiective to disengage the selected disc from its supporting shaft ior replacement by another code disc bearing a different telephone designation.

In a typical example of operation for transmitting a telephone call designation and considering the angle lever 28 and the gear sector 26 in normal unoperated position as shown in Fig. 2 the pin I52 abutting against the shoulder portion I53 of pawl 5Iunder the tension of motor spring 30 through pinion 31 and the ratchet wheel 38 engaged by the pawls 30 and 40 carried by gear 4| force the lug I50 '0! angle lever I55 against the vertically extending arm I5I of rack I for pivoting this rack on shaft H8 against the tension'of spring I5I and holding it-in disengaged relation from the lug I50 of arm I20 as to permit the movement of this arm along the shaft H8 as imparted bythe turning movement of knob IH' actuating the sprocket wheel H4 and thereby the chain H5 in line parallel with the shaft H8 through its engagement with the idle sprocket The sliding movementof arm I20 and that of the feeler arm 14 on shaft I I is efiective to position the ieeler member 12 in operative relation with one of the code discs CD on shaft 52, such position being indicated by the perforated strip I28 carried by arm I20 when in juxtaposition to the name of the subscriber desired. which corresponds to the telephone designation formed at the periphery of the selected disc. Supposing that such a disc is formed for transmitting the telephone call designation No. 88271, as shown by the code disc X shown in Fig. 17 and in blank form in Fig. 13, in such a disc the notch A represents digit 8 or eight pulses, notch B, digit 8, notch C, digit 2, notch D, digit '7, and notch E, digit 1, the angular distance or length of the notch E being equal to one reciprocating movement of feeler memmember I2 as imparted by the star-wheel 05,

while the notch D isequal to seven reciprocating movements, the notch C, two, the notch B, eight and the notch A eight since the code disc X may be considered to be divided into 110 parts, which is equal to 27% 4=1l0, where 27% is the number of turns of shaft 45 and 4 is the number of teeth in star-wheel 55 ,which operate the bar 13 and thereby the ieeler arm '14 and the cam 92.

Upon the movement of the position shown handle lever 20 from spring 30, carried by gear sector 25 engages-the pawl i for pivoting it on its pivot I50 against the tension of its retractile spring I50 to disengage this pawl from the pin I52 as to permit the turning movement of gear 4| and to cause the spring I50 to simultaneously impart a sliding movement to angle lever I55 on pivot I55 to cause the engagelug I50 of arm I20 and thereby locking this arm and the feeler member 14 in the selected position.

Upon the return movement of handle lever 20 and that of gear sector 20 through the tension of motor spring 00 the gear H is rotated a comete turn through the engagement of its pawls 30 and 40 with the teeth of ratchet wheel 30, the latter being rotated as above described through the engagement of pinion 01 with the gear sector 25. k

The movement of gear sector 25 is imparted tion of shaft 52 and the code discs shunt cams S1, S2,

where the feeler member 12 spaces and are each Y I20 as to permit to shaft 45 of 'ments to the bar 18 and thereby to the feeler arm 14 and cam 92, simultaneously with the rota- CD mounted be noted, however, that upon the rotation of shaft 52 and the code discs CD an angular distance corresponding to the portion AP of disc X, the lever arm 14 is held out of operative relation from the star-wheel 95 and the bar 13 is not reciprocated so maintained against the resistance of its retractile spring WS in the position shown in Figs. 9, 11, and 14. In that condition the lugs Z1, Z2, Z3.

thereon. It is to and Z4 of links M1, Ma, Ma, and M4 as shown diagrammatically in, F 18 are guided by the cams SI, 92 and barrier 93 in a path wherein the roller pulsing cams P1, P2, P3, and Hand the S3, and 84 are ineffective with respect to their associated pulsing and shunting springs 94 and 95, respectively. However, upon the. continued movement of shaft 46 and the selected code disc X carried thereby to a point enters the notch A through the tension of spring .WS as to permit the reciprocating movement of the bar 13, its supporting arm 91 through its extending portion 98 moves cam 92 out or engageable relation cams to move in a path as indicated in Figs. 19 and 20 for engaging the pulsing and shunting springs 94 and 95 during two turns of shaft 45 or eight vibrations of the feeler member I2 thus causing the digit eight to be transmitted and in a like manner the remaining digits 8, 2, '7, and 1 in-- cluded in the call designation represented by the code disc X.

The peripheral portions PH1, PHz, P113, and PR4 are used to provide the so-called interdigit equal to one turn of shaft 45 or four vibrations oi feeler member 12.

Upon the return movement of shaft 02 and the code discs CD carried thereby to normal, the pin 52 carried by gear 4| reengages the shoulder portion I53 of pawl 5I for' imparting a sliding movement to angle lever I55, and thereby engaging the lug 1,50 of the angle lever- I55 with the upright arm I6I of rack I for pivoting this rack against the resistance of its retracting spring 2 i5I for disengaging it from the lug I50 of arm the movement of this arm along its guiding shaft H8 tor the selection of another disc bearing a difierent code designation by the manual operation of knob III and the transmitter is now ready for a subsequent call transmitting operation.

What is claimed is:

1. A call transmitter comprising 'normally closed impulsecontacts, a plurality of operating members movable in 'a circular path for engaging said contacts, and a pluralityfof cooperating 'cams for changing the .path of said members for controlling the operation of said contacts.

2. A call transmitter comprising normally closed contacts, a plurality of operating members movable in a circular path for engaging said contacts, a movable cam, cooperating with said movable cam for changing the path of said members for controlling the operationof said contacts.

that cam 92 is and av stationary cam means for moving said movable cam in a position inefiective with respect to said operating members for actuating said contacts.

1. A call transmitter comprising normally closed contacts, a plurality of operating members for said contacts, a rotatable shaft for moving said members in a circular path for actuating said contacts, a plurality of cams, one of said cams being movable, a rotatable code element, and means operated by the movement of said rotatable shaft and cooperating with said element for controlling the operation of said movable cam for operating contacts.

5. A call transmitter comprising normally closed contacts, a plurality of operating members for said contacts, a rotatable shaft for moving said members in a circular path, camming mem- .bers for positioning said members along said path in position ineifective with respect to said contacts, a disc having a plurality of notches at its periphery representing the digits of a call to be transmitted, motor means for actuating said rotatable shaft, another shaft actuated by said motor means for said bar, said arm being movable for selectively tacts.

7. In a call transmitter, a shaft, a plurality of code elements having portions for engaging said shaft, a series of spider arms carried by said shaft and extending radially therefrom, and a plurality of spring members carried by said shaft for engaging said portions, said arms serving for holding said elements perpendicularly to the axis of said shaft and in spaced relation relative to each other.

8. A call transmitter comprising a plurality of code elements, a rotatable shaft, means carried by said shaft for receiving said elements in spaced relation to each other, a motor spring, a gearing mechanism operatively connecting said tacts, and a speed governor actuated by said gearing mechanism for controlling the operation of said motor.

9. A call transmitter comprising a rotatable shaft, a plurality of code elements mounted on said shaft in equal spaced relation to each other,

tion of said elements and said feeler member for actuating said contacts, and locking means operable upon tensioning of said motor spring for preventing selective operation of said manually operable mechanism during the'operation of said contacts.

10. A call transmitter comprising a plurality of code elements, a rotatable shaft, means for resiliently holding said elements in spaced and centered relation on said shaft, a pulsing mechanism, a feeler member, a reciprocating bar for actuating said feeler member, a manually operable mechanism for moving said feeler member in selected position with respect to said elements,

said mechanism including a knob, a sprocket wheel actuated by the movement of said shaft and movable by the operation of said chain for positioning said feeler member in selected position with respect to said code elements,a projection laterally extending from said arm, a motor spring for actuating said elements for controlling the operation of said pulsing mechanism, a pivoted rack, means actuated by the movement of said ber with respect to one of said discs, a motor spring, a manually movable handle lever for tensioning said spring, and means actuated by the manual operation of said handle lever for moving said rack in engaged relation with the projection of said arm for locking said feeler member in selected position during the operation of said pulsing mechanism.

HARQLD W. GOFF.

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