US1119394A - Telephone system. - Google Patents

Description

J. G. BLESSING.

TELEPHONE SYSTEM.

APPLICATION FILED DEO. 21,1908.

1,1 19,394. Patented Dec. 1, 1914.

6 SHEETS-SHEET l.

J. G. BLESSING.

TELEPHONE SYSTEM.

APPLIOATION FILED 13mm, 190s.

1,1 119,394, Patented Dec. 1, 1914.

8 SHEETS-BEBE?? 2.

` ivm/wif@ J. G. BLESSING.

TELEPHONE SYSTEM.

APPLxoATIoN FILED m021, wos.

6 SHEETS-SHEET 3.

Patented Dec. 1, 1914.

L G.BLESSING.

TELEPHONE SYSTEM.

APPLIUATION FILED 1320.21, 190e.

Patented Dec. 1, 1914.

6 HEETS-SHBET 4.

J. G. BLESSING.

TELEPHONE SYSTEM.

APPLIUATION FILED 1320.21.1908.

1,1 19,394. Patented De0.1,19 14.

e SHEETS-SHEET 5.

www

J. G. BLESSING.

TELEPHONE SYSTEM.

APPLICATION HLBD DB0A 21, 1908,

1Jo l l 9,394. Patented Dec. 1, 1914.

6 SHEETS-SHEET 8.

35 the plunger and the cylinder' walls. Re

whereby the end of the locking pin` nearest the dial' registers with one of the slots 17, as indicated at 18 in Fig. 16.

, .llt will be seen that there are as many of these slots 17 as there are finger-holes 19, so that the dial is adapted to be locked in any one of ten positionsthat is, in an)7 one of its normal positions. The pendant rod 11 is also adapted to control a dash-pot arrangement. (See Fig. 3). The said dashpot, it will be seen, is mounted on the' bushing 6. It consists of a cylinder 2() and plunger 21 and a retracting spring 22. The plunger 21 has a central bore 23 that connects lthe air chamber with the valve in the upper section. It will be seen that when thc plunger 21 is depressed by the switch-hook through the medium of the flange 2li, (Fig. 3), the air rushes up through the bore 23 and raises the ball 25 and passes out through the crevice'26. lVhen the plunger. is released, however, the aircannot return by the way it passed out, but must leak in between ferring to Fig. 3, it will be seen that the piston or plunger of the dash-pot is provided with a depending member 27 which is adapted to work in conjunction with the springs 28, 29 and 30. Therefore, when the switch-hook is depressed the spring 29, which is held inengagemcnt with the spring 28 while the receiver is off the hook, may be quickly separated from said spring 28 and permitted to pass into engagement with the spring 30, as when the receiver is vhung up; but when the receiver is removed from the hook the spring 2) cannot reverse its position as quickly.' lt will. be seen that the plunger 21 has attached to it a separate spring 31, the tension of which may be 'regulated to control. the time of operation of the dash-pot.

The calling device is detachable as awhole from the base 2, there being no electrical connections whatever attached to the calling device. It consists of a frame having a .front plate 32. and a back.-plate suitably held together by ties 84 (Fig. 15). Clamped tothe plate by means of a clamping plate there isa glass plate 36 provided vwith a proper cushion-back of paper or other material 37. The dial 12 is suitably secured to a centrally located shaft 38 which is supwheel engages a pinion 1,1 rase-fi ported in place between the clamping plate 35 and the back plate 33. Attached to the shaft 38 there is a coiled spring 39, the other end of which is attached to the gear wheel' L10 (see Fig. 17) which is loosely mounted upon the rear section of the shaft 88. This gear wheel 40 is normally kept against the cup 41 (Fig. 18) that contains the spring 39 by a suitable spring 42. This spring and its relation to the gear wheel Ll() is more clearly shown in Figs. 19, 26 and 28. The gear 4 3 (see Figs. 11 and-14), to which pinion there is attached a gear 411.' This gear in turn meshes with a worm gear 45 to which a governor 4:6 is attached. This governor is of a centrifugal charac-ter, the ends of the limbs 47 (Fig. 12) of which are weighted and swing oil' until they strike and run against the inner surface of the cylinder 48 (Fig. 15). .Evident-ly, therefore, the speed at which the gea-r wheel A10 (Figs. 19, 20, 26 and 38) can rotate may be controlled by such governor. At the end of the shaft 1) that carries 'the worm 45 (F igs; 12, 15 and 29) and opposite the governor end, there is pivoted a twotoothed pinion 50 through the medium 4of whi li the governor is normally locked. The locking member 5 1 (Figs. 26, 27, 2 8 and 29) is loosely mounted upon a pin 52 (see Fig. 15) which is held in position between the front and back plates 32 and 33 of the frame. This locking member 51 is prevented from rotating on this pin by a short guide pin (not shown) that projects forwardly from the back plate It will be seen that the saine spring that holds the gear wheel 40 in its normal position, as shown in Fig. 1S), retains the locking member 51 in a position to hold one-of the teeth of the pinion 50, as shown in Fig. 29. This locking n1embei'51, as indicated in Figs. 26 and 27, is adapted to slide back and forthon the pin 52'. While in the .position indicated Lin Fig. 26, the locking member 51 Aassumes the 'locking positionshown by the solid lines;`. but when 1t assumes the position shown in Fig. 27, the locking member slides to the position indicated by the dotted lines in Fig. 29 and permits the governor and, therefore, the gear wheel to operate. It will be seen that whether or not the governor and gear wheel may rotate depends upon the position of the spring 42 (see Figs. 26 and 27), and it also depends upon the position of the trigger Referring more particularly. to Figs. 12 and13, this trigger consists in detail of a shaft 54 at the front end of which there is attached the member 55`v and at the rear end of which there is attached the member 56. Due to the control of the trigger 53 the spring l12 may be removed from` the locking member 51, as indicated in Fi 28, butstill the locking member 51 will e unable to assume thepositioir Tilt) shown in Fig. 27 for locking the governor, as indicated in Fig. 29, due to the position of the trigger arm 56. This position is indicated in Figs. 1l and 12 which corresponds with the position indicated in Figs. 26 and 28. When, however, the linger of the calling subscriber presses the trigger 53 su'lliciently to lower the arm 56 (Fig. 12) and permit the coiled spring 57 to drive out the locking member 51, as indicated in Fig: 27, then and at the instant that the locking member 51 clears the tip ofthe governor the main spring 39 acts to rotate the gear wheel 4U, which in turn rotates the pinion 43 on the shaft 58 on which is located the gear 44 which in turn drives the governor.

It will be seen'that on the shaft 58 (Fig. ll) there is provided a device 59 for operating the impulse springs 60 and 61. These springs 60 and 61 are indicated in Figs. 7, 8 and 9, and at the called subscribers station. This cam-like device 59 that controls the impulse springs is more clearly shown in Fig. 30. It will be seen that the gear wheel 40 (Figs. 19, 20 and`21) is pro vided with an anti-'friction roller 62 for preventing friction between the edge of the spring cup L11 and the gear wheel 40. This anti-friction wheel 62 normally restswithin a carved-out section 63 (Fig. 19).` It will also be seen that on the sides of th spring cup and diametrically opposite this carved-out section there is a stop-lug 64- (Figs. 18 and 22) against which the pin 65 on the gear .Wheel ll() normally rests, as indicated 'in Fig. 23. When the subscriber turns the dial he rotates the spring cup 41 which is rigidly secured to the dial; and since the governor is normally locked, as indicated in Fig. 29, the gear Wheel 40 cannot turn, and consequently the roller 62 is forced from the depression or carved-out section 63 to the rim 66 of the spring cup, as indicated in Fig. 20, with the result that both the gear wheel 4() and spring 42 are depressed, as indicated in Fig.. 20. As the dial continues to rotate, the tension in the cup spring 39 is increased until the finger trips the trigger 53. By the time that the finger reaches the tin'ger stop 67 (Fig.10) the trigger 53 has been sufficiently pressed to permit the rear arm 56 to clear the pin or shaft on which the governor locking member 51 is mounted.

By referring to Fig. 13, it will be seen that normally thetail-stock 68 on the front arm 55 of the trigger retains the end 69 of the spring-controlled locking device, one end of which is shown at 70. This device, having ends 69 and 70, is controlled by :i retracting spring which. like the spring lit shown in Fig. l1, is adapted to engageone of the slots 17 (see Figs. 13 and 16) on the dial, `whereby the dial is prevented from turningas long as the geanwheel 40 is turning. Even if the subscriber should remove hls finger from the tr1gger 53 before the mechanism comprising the train o gearsy has stopped rotating, still the trigger 53 cannot return to normal position, because the pin or shaft drops behind the arm 5G of the trigger, as indicated in Fig. 27, and prevents the arm 5G from raising to the normal position shown in F ig. l2. It follows, therefore, that as long as the mechanism is operating, the dial remains locked through the medium of the locking mechanism shown in Fig. 13 which coniprises the member provided with the terminals 70 and 69. As soon as the mechanism releases the stopping pin, however, the trigger is released and the dial is unlocked, but the governor is locked. This operation is accomplished :in the following manner: The dial having 'been rotated. and operating tension having been set up in the cup spring 39, then as soon asthe governor is unlocked the gear wheel 40 starts to rotate in the same direction that the dial has been previously1 ro tated until the` anti-friction wheel 62 again yfinds the depression G3 into which the spring 42 forces the said wheel, as shown in Fig. 19. At the same time the spring 112, it will bel seen, restores the goif'ernor looking mechanism, as indicated in Fig. 26, thereby witl1 drawing the pin 52 from behind the arm 56 of the trigger, with the result that the retracting spring 71 then restores the trigger' to its normal position. plainedvthat shortly after the anti-friction wheel (i2 registers with the depression (i3, the stop of the4 gear wheel 40 meets the stop-lock 61 on the spring cup, which therebyinsures that the pin 65 registers with one oi the holes 72 into which it is forced by the spring -l-B at the same time that the antiiriction wheel 62 enters the depression 63. It will. of course, be evident that itisim ,possible for the pin 65 to enter one of the holes 72 before it nears the lug G4, as, for example, in the position indicated in Fig. 22, on account of the anti-friction wheel 62. rlhe engaged and disengaged positions of the pin 65 and the holes 72 are indicated in Figs. Qlfaud Q5, respectively. Although in the drawings the holes 72 are larger than the pin 65, it is not necessary that Ithey should be any larger than to just admit the pin It will at once be seen that this is true because the actual stopping is done at the governor. The principal.use of the pin 65 is to stop the dial if it should be released before the trigger is messed.

From the foregoing it will be seen thaty when the subscriber rotates the dial in a clockwise direction (Fig. 10) he winds up the main spring 39,- and at the same time presses the gear wheel 40 away from the dial. This gear wheel 40 in turn presses th'e spring 42 away from the governor-locking It should be exthe control oi' the arm 56 of thetrigger 53.

' stant the si' As the linger reaches the linger stop 67 the trigger' 53 is depressed, with the result that the arm clears the governor-locking device 51, leaving said device to the control of the retractingspring 5-7, which spring withdraws the locking device from the governor, thus 'permitting the train of gears to operate. At the same time that the governor is unlocked. the trigger operates to lock the dial 12 (Fig. 31) by advancing the linger 70 of the dial-loclring device into one of the slots 17 in the dial. The power' toroperat ing the train ot gears, as already explained, vis provided by the main spring 39 which, since the dial 12 is rendered immovable at the same time the governor is unlocked, forces the gear wheel -10 to rotate. This gear Wheel in turn rotates the'shaft 58 on which are fastened the gear 44 and the impulse spring cam 59. As this cam 59 rotates it operates the impulse springs which control the switches at the central. oiiice. The gear wheel la, of course, being in engagement With the worm gear rotates the gover-A nor. As soon as the governor begins to ro- I tate, the gear wheel i() begins to rotate also and continues to do so until the anti-friction Wheel (32 finds the depression 63. By the time the Wheel 62 finds the depressi-on the stop pin (i5 strikes the'stop lug 64, and at the same time the gear Wheel l0 is pressed into normal position, as shown in Fig. 19, with the pin 65 in one of the holes 72, as shown in Fig. Q3, thereby bringing the Whole train to a standstill. lt is evident thatas the wheel a() drops into normal position the spring '42 drm the locking member 51 into position, looking the governor and unlocking the aim 5o o the trigger, at which inii 71 restores the trigger, the member c.. vhieh then permits the diallocliing pin to be drawn out of engagement with the dial. thans unlocking said dial.

It will be seen that the above description applies to Fi g. 3l, and taken in conjunction with this figure gives a clearer understanding of the workings ot the calling device. ln connection withv this ligure it may be Well to explain that the trigger, to which in this ligure are attached the arms 55 and 56, oscillates about an axis indicated by a line awa.. Bjr' referring to this figure it will be seen that when the spring-4.12 is forced to the right by the gear Wheel ell) when the' dial is rotated, the governor-locking device 5l is prevented from opera .ng (iu response to the tension el thi` .spring 57 by the arm 56 vthe rotation ot said rilassa mal position, at which time the spring 1li vrestores the loclzing member 51 and releases the trigger. When the calling device is in position onihe base ot' the subscribers instrument, as indicated in lfgs. l and (l, the cam 59 is brought into suol iiiosition that :am t ratos the inln pulse spring G1. lt wil be sec i that at each resolution ot the cam 3f) the spring (3l is separated from the spring (30 twice. This particular construction, however, is not es sential, as the cam may be made to separate the spring only once at each -ieifiilutiom or more than twice during' each revohition. It Will be seen, furthermormby referring to vFig. 15 that the pin which is controlled by the s\vitchhook (Fig. l) through the gaged by the dial-locking terminal 7 O (Fig. 13) VJli'ithin the base of the l .me the plate 7 3 is suitably fastened to the inen'lber 7 by a, nut 74. On this plate are mounted the binding posts 75, induction-coils, springs and other details necessary ter completing and controlling the circuits" at the subscribers station. Beneath this plate there is pro` vided a guard 7G whichis also properly secured, as, for example, to the nut 74 by a screw 77. A1 suitably insulated. opening 78 is also provided for a terminating cable that is made up o'l conductors that connect with the line and other circuits.

From the foregoing it will be seen that l. provide an improved arrangement whereby the'calling device is located at the base of a telephone deskfset, and whereby the switchhook. at the upper end of the standard of the set is mechanically connected with the said calling device, whereby the requisite control is exercisedby said hook over said device. It will also be seen that I provide means Yfor retarding the transition et' the line from normal to operative con litioii--tl1at is to say, when the subscriber takes down his receiver the line does notcliange instantl)A from its normal condition to a condition suitable for the transmission of voice-currents. In this Way the subscriber or ailing party is precluded from hanging .up his receiver and then instantly taking the saine down againand thereby interfering vwith the release of the switches. The switches at the central station, some .of which have one motion to select groups vand another metion to connect with a line in any selected group, are releasable by simply opening the line circuit at the substation. For this reason it is desirable that provision be made for insuring against a too quick closing ot the line circuit after the same has once been opened for the purpose of releasing. Also.

the subscriber or calling party cannot torce or manipulate the dial 1n such 'manner as toA iatezici-e with the proper transmission ej? lll) the impulses, inasmuch as the dial can pnly rotate operatively in one direction; and if released before reaching the limit of its forward motion will fly back without sending any impulses. As soon as the subscriber or calling party moves the trigger 53, which motion is suflicient to automatically release the impulse wheel, the latter then rotates to an extent corresponding to the extent to which the propelling spring has been tensioned for any particular-digit of the called number. Thus the dial always rotates first and the impulse wheel afterward; but with my improved arrangement the impulse wheetr'otates much faster than the gear wheel that is propelled by the spring, there being aI speed-up gearing between the spring and the impulse wheel. 'This speed-up gearing has a propelling device at one end and a governor at the other end, and the impulse wheel is connected at an intermediate point therein. By applying the stopping device to the governor, which is at a point in the gearing having the highest speed, greater certainty is obtained, as the mechanism is stopped instantly and without danger of being carried beyond the proper point by momentum. Both the mechanical connection between the switch-hook and the dial and the dash-pot or retarding device are located within the standard-that is to say, withinf'th'e tube which rises from the base upon which the calling device is located. As thus constructed it will be seen that my invention contemplates an improved and highly e'liicient telephone desk-set of that general type in which the receiver, switchhook and transmitter are supported at' the upper 'end of a tubular standard which rises from a base or pedestal.1 It will also be seen, as explained, that by my invention I provide a calling dial that cannot remain in an intermediate position-that is to say, it must be rotated until the linger of the operator reaches the stop 67 in order to en* able it to remain in an advanced position.o If released before the finger strikes the stop 67 the said dial then flies back to the posi tion from which it was moved, without transmitting any impulses. The impulsetransmitting mechanism is automatically released by pressure of the finger on the trigger 53, and thus the impulse mechanism is automatically set in motion regardless of whether the subscriber lets go of the dial. Obviously the movement of the impulse wheel to transmit the impulses cannot be accelerated or interfered with by the calling party. Thus the proper transmission of the impulses is made more reliable and certain. Y

What I claim as my invention is :m

1. In a telephone system, a rotary dial, an impulse wheel, separate or non-coincident axes for said dial and wheel, means for caus ing the wheel to rotate after the dial while the latter remains at rest in its advanced position, a governor, and a train of gearing to the ends of which the dial and governor are applied with the impulse wheel connected at an intermediate point therein.

2i In a telephone system, a dial, an axis for said dial, an impulse wheel provided with an axis, a speed-up gearing from the axis of the dial to theu axis of the wheel, and means including a spring whereby the wheel rotates after the dial and while the latter standing still.

3. In a telephone system, a dial, an impulse wheel, a spring adapted to be ten sioned by. the forward rotation of the dial, means for holding the dial against return in a backward directionto normal position, aspeed-up gearing driven by the spring to operate the said wheel, and means for auto matically releasing the'wheel when the calling party operates the dial.

l. In a telephone system, a train of gearing, a spring applied to one end of sai. train to propel the gearing, means for tensioning the spring. an impulse wheel connected at an intermediate point in said train, a governor applied at the other end of said train, and means 'for automatically releasing the train ot gearing each time the spring is tensioned for a digit of thealled number.

5. In a telephone system, a subscribers calling device provided with an impulse wheel in the form of a cup having a con 100 tinuous but uneven edge serving as a cam, and cireuit-controlling means insulated from. engaged and operated by the cam edge of said wheel.

(l. In a telephone system, a dial, a gear 105 wheel, a spring for propelling the gear wheel. said spring connected to be wound up by the dial, means i'or releasing the gear wheel when the dial has been advanced, an impulse wlieel, and a gearing through which the gear wheel acts to drive the impulse wheel.

7. In a telephone system, a dial, an impulse wheel` means whereby the advancement of the-dial causes the subsequent advancement of the wheel, a governor, and means applied at the governor to automati-z, ally release the wheel when the calling party operates the dial.

8. In a telephone system, a base, a standard, a hookswitch at the top of the stand` ard, a calling device on the said base, and a mechanical connection inclosed within the standard, whereby the hook-switch exercises control over the said calling device. h

9. In a telephone system, a base, u calling device on the base including a dial, a standard on the base, a switch-hook at the top of the standard, -a look for said dial, andia rod for operating` the lock to release the dial 13p dit tid

when the receiver is removed from thesaid hook, said rod disposed vertically within said standard 10. In a telephone system, a base, a standard on said base, a switch hook at the top of said standard, a pin extending upward through said base, a rod-for operating the pin when the receiver is removed from the said hook, said rod disposed vertically within said standard, and an impulse-transmitting device controlled by said pin.

11. In a telephone system, a base, a dial mounted on said base, a dial lock, a standard on said base, a switch hook at the top ot said standard, springs in said base, and means extending downwardly in the standard to operate said springs when the hook is raised.

12. In a telephone system, a base, a dial mounted on said base, a dial, lock, a stand- .ard on said base, a switch hook at the top of said standard, springs in said base, and a dash-pot for retarding the operation of said springs when the receiver is moved from the hook, said dash-pot inclosed in' said standard.

13. In a telephone system, a dial, adial lock, a switch-hook, a rod by which the hook operates said lock, line springs, a dash-pot connected to operate said springs, means by which the said rod operates the dash-pot only in one direction, and a spring for operating the dash-pot in the opposite direction when the receiver is removed from the hook.

14. In a telephone system, a calling device including an accelerating gear train, an impulse-transmitting device operatively connected thereto at a point between the ends thereof, means for moving said train after lthe calling device is operated, and means for stopping said train, the stoppingI force adapted to be applied at the point of maximum motion.

15. In a telephone system, a calling device including an accelerating gear train, an impulse-transmitting device operatively connected thereto at a point between the ends thereof, means for imparting motion to the train, and means for stopping the same comprising a device adapted to be 4applied at a. point in the train at which the motion is greater than at the point to which the impulse-transmitting device is connected.

16. In a telephone system, a calling device including a gear train one end of which is adapted to move at. a slower rate lthan the other, an impulse-transmitting devi-ce operated by the train, means for moving said train, and means for stopping the same comprising a brake adapted to be applied at the point of highest motion to insure an instantaneous' and exact stopping of the train and the impulse-transmitting device.

il?. lln a telephone system, a calling device including an accelerating gear train comprising a power wheel at the slow end and a governor at the fast end, an impulse-transmitting device operated by saidgear train, means Jfor causing the operation of the' gear train to a definite and lpredetermined excomprising a power gear and a governor, the power member having one end attached' to the power gear and the other end to the dial, locking means for the dial, means for maintaining the train normally locked, whereby the dial may be operated without at the same time moving the train, and whereby tension may be created in the power member for voperating the train, means for then unlocking the train, whereby the impulse-transmitting means may be operated, together' with means for at the same time locking the dial, means for then stoppingthe' train comprising a lock adapted to lje apting means operated by said train, said train plied directly to thegovernor to insure an instantaneous and reliable stoppihgo the train, and means for at thesame time une locking the dial.

19. A telephone system calling mechanism including a. governor-locking mechanism, a dial-locking mechanism, and a trigger for controlling said 'mechanismsdn such a manner that when the governor is locked the dial is unlocked, and' vice versa, as set forth.

20.v A telephone system callingmechanismv including a dial-locking mechanism, a governor-locking mechanism, both con trollo-d by a trigger, a dial, and a dial stop, the trigger adapted to be operated by the calling partys finger as it approaches the finger-stop, whereby at the instant thatv the.y finger reaches the stop the trigger. releases the governor-locking mechanism, and locks rndl operates the dial mechanism to lock-the 21. In a telephone system, a subscribers calling mechanism provided with a pin and a series of holes cooperating therewith to effe'ct an instantaneous and exact stopping of said mechanism, as set forth.

22. In a telephone system, a subscribers calling mechanism provided with a rotary dial, means Jfor locking the dial in its advanced position each time it is rotated, and' devices operative to cause the dial to return to its last position when released before reaching the end of any forward rotation thereof..

23. In a iyelepli,onesystem. a'subscriberav loo nuda

calling mechanism provided with a rotary dial, a rotaryl impulse wheel, a stop forvariably limiting the forward rotationpf the dial, and means including a trigger associated with said stop for automatically releasing the impulse wheel when the dial reaches the limit of any forward rotation thereof, whereby no' impulses are trans mitted unless the dial is fully rotated.

In a telephone system, a subscribers calling mechanism provided with a rotary dial, suitable devices operative to cause the dial to return to the position from which it was moved when released for reaching the limit of its forward rotation, and an i'mpulsetransmitting device controlled by the dial but inoperative to transmit impulses when the dial is released at an intermediate point in its' forward rotation.

25. In a telephone system, a subscribers calling mechanism comprising a rotary dial, an impuIsc-transmitting device controlled by the dial, a trigger actuated upon completion of the forward rotation of the dial to automatically start the operation of said impulse-transmitting device, and devices whereby the dial returns to the position from which it was rotated if the trigger is not operated.

QG. In a telephone system, a subscribers calling mechanism comprising a rotary dial, devices operative to return the dial to the position from which it was rotated when released at an intermediate point in any forward rotation thereof, and an impulsetransmitting device operative to transmit impulses each time the dial reaches the limit of its forward rotation, but inoperative to do so when the dial is released before the forward rotation is completed.

27. In a telephone system, a subscribers calling mechanism comprising an impulsetransmitting device, a train of gearing for operating the same, a pin and a hole adapted to cooperate therewith for insuring an 1nstantaneous and exact stopping of the impulse-transmitting device, a rotary dial, and devices by which the dial flies back to-the position from which it was rotated if released before reaching the limit of its for Ward rotation, said pin and hole thereby also serving to prevent injury to the said gearing when the dial is released before completing its forward rotation.

28. In a telephone system, a subseribers calling mechanism comprising a rotary dial, an impulse-transmitting device, a train of gearing connecting the sa1d d1a1 With the said device, a stopping `device adapted to acl. fr the gearing at the highest point of special ther-ein, and the pm and holes coopel-amig therewith to enable the said stopping device to act effectively at the precise moment.

29. The combination with a numbered plate, the forwardly moving finger hold dial, the slotted flange fixed thereto, the locking member, the movable finger lever adapted to be engaged by the finger when in a finger hold, the fixed indicator, Said lever when engaged by the finger upon actuation of the dial, controlling said locking member to engage said flange to lock the dial, impulse mechanism operated responsive to said4 actuation of the dial and finger lever, and means for unlocking said dial after said mechanism has operated.

30. In a calling device, the combination with a rcvoluble dial having a plurality of operating positions and a series (if-adjacent finger holds for actuating said dial, coperative contacts, operating means` for said contacts adapted to-be adjusted corresponding to movement of said dial to any one1 of its positions, a finger lever adapted to be actuated by engagement with the finger 1n a finger hold, a lockingr member controlled l, by said finger lever for locking said dial against further actuation when moved to any of its operating positions, means for releasing said operating means from an adjusted position to operate said contacts, and means for unlocking said dial after said contacts have operated.

31. In a telephone system, a dial, an impulse'wheel, means whereby the advancement of the dial causes the subsequent ad vancement of the wheel, a governor and automatic means for'directly releasing the governor to permit the operation of the thel when the calling party operates the 32. In a telephone system, a calling device including an accelerating gear train, an impulse transmitting device operatively connected thereto at a point between the ends thereof, means for moving said train after the calling device is o erated and means for stopping said train applying the stopping force at the point o maximum motion.

Signed by me at Chicago, Cook county, Illinois, this 15th day of December, 1908.

JOHN G. BLESSING.

Witnesses:

EDWARD D. FALns, J. NORBY.

Gopiea of thin patent may be obtained for ave cents each, by addressing the Commissioner of Patents, Washington, D. C9

D Correction in Letters Patent No. T,ll9,314.

It is hereby certified that in Lettere Patent No. 1,119,394, granted December 1i,

1914. upon the application of John Blessing, of Chicagmlllinois, for an improvement in .Telephone Systeme, an error. appears in the drawings requiring correction as Jfollows: Sheet Fig.v 2%), should appear asheren shown,

l l l l 15gg. Z9.

` and not as shown in the drawings forming part of the Let-ters Patent; 'and that the' said Letters Patent should be read With this correction therein that the same may conform to the recordl of the case in the Patent Office.

Signed and sealed this 2nd day of February, A. D., 1915.

[SEAL] R. F. WIUTEHEAD,

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