US703953A - Self-winding electric clock. - Google Patents

Description

N0. 703,953.' PaBnBd lllly l, |902. C'. M. CRUK. SELF WINDING ELECTRIC CLOCK.

(Application led Mar. 9, 1901.)

3 Sheets-Sheet l.

(No Model.)

Witwe/S565,

o., mowrufuo, mswmsm Patented .luly l, 1902.

C. M. CBOK.

SELF WlNDlNG-ELECTRIC CLOCK.

(Application led Mar. 9, 1901.)

3 Shee'ts-Sheet 2.

(No Model.)

m. mx Nm. @wx @bmi v 5% w@ N @WN M WK No. 703,953. Patented my i, 1902.

c. M. canon.

SELF WINDING ELECTRIC CLOCK.

(Application tiled Mar. 9, 1901.) v

3 Sheets-Sheet 3.

(No Model.)

UNITED STATES PATENT OEEICE.

CHARLES M. CROOK, OF BRISTOL, CONNECTICUT, ASSIGNOR TO TI'IE NATIONAL SELF W'INDING CLOCK COMPANY, OF ELGIN, ILLINOIS,

A CORPORATION OF ILLINOIS.

SELF-WINDING ELECTRIC CLOCK.

SPECIFICATION forming part of Letters Patent No. 703,953, dated July 1, 1902.

Application led March 9. 1901. Serial No. 50,438. (No model.)

It consists in improvements in the circuit making and breaking devices and improvements in the winding devices-and' particularly construction by which both the timetrain and the striking-train are wound by impetus derived fromthe same electromagnet, magnets, and, specifically, by the same movement of the magnet-armature.

In the drawings, Figure l is a front elevation of so much of my clock as pertains to the present invention, the front plates of the clock-frame being removed and only the prime-wheels of the time-train and strikingtrain, respectively, being shown7 the remainder of said train, including the governing devices, being removed. at the line 2 2 on Fig. l. Fig. Si is a section at the line 3 t3 on Fig. 2. Fig. t is a detail elevation showing the prime-wheel of the time-train, with the retaining wheel and spring, the retainingwheel being partly broken away tovshow the spring. Eig. 5 is a detail rear elevation showing the contact devices for opening and closing the electric circuit. Eig. 6 is a perspective view of'a contact-piece on the time-train main shaft. Fig. 7 is a detail section at the line 7' 7 on Fig. 6. Fig. 8 is a section parallel with the rear plate, cutting the fore and aft shafts and bindingposts at proper plane to show an elevation of the strike and time trains, winding-cams, and levers, of a slightly-modified form of construction.

A is the front frame-plate of my clock. A is the rear frame-plate.

Fig. 2 is a section B is the electroinagnet, by means of which the motive power is supplied, said magnet being energized by a proper circuit, of which the wires are partly shown, which is opened and closed by connections hereinafter described.

B is the armature of the magnet; B10, the lever-arm of said armature, said lever-arm being fulcrumed at h on the frame.

b1@ is a spring coiled about the rock-shaft of the armature-lever, tending to rock the lever to carry the armature away from the magnet-poles.

C is the main shaft of the time-train, being also the minute-hand staff.

C/ is the mainspring drum or roller, loose on the shaft C.

D is the mainspring of the time-train, which is stopped at one end with respect to the drum C/,as by heilig engaged with the camlever arm E, which is rigid with said drum, and stopped at the other end at any suitable point on the frame, as on the post A2. (See Fig. 2.)

O10 is a ratchet-disk rigid with the drum C.

C2 is the first wheel of the time-train, loose on the main shaft C; but it is carried frictionally with said shaft by means of the collar C3, which is pinned fast to the shaft, and having rigid with it a spring-tripod C3U,which bears against and is engaged with the face of the linely-serrated or marginally-corrugated disk C4, which is fast on the face of the Wheel C27 and holds the hub C21 of the latter hard against the shoulder c of the shaft C. Loose on the hub of the wheel C2 is a retaining-wheel c2, which is connected to the latter by a retaining-spring C5, of which one end is attached to each of said connected wheels, the spring being coiled to put it under tension and reacting to rotate the wheel C2 with respect to the wheel c2 in the direction in which both are driven in the running down of the train. The wheel c2 carries a pawl C20 for engagement with the ratchet-disk` C1 and has a ratchet-periphery which is engaged by the retaining-pawl 020, pivoted on the frame. These wheels c2 and C2 are assembled with the retaining-spring C5 coiled to the full extent, so that it is ready to act on the wheel C2 to IOO drive the train whenever, as during winding, the wheel C2 is momentarily deprived of the driving stress communicated from the mainspring through the ratchet C10 and the pawl C20. The cam-lever arm E, rigid with the drum C, extends therefrom at right angles to the shaft C into the path of movement of the abutment B11, which is a stud and roll jutting from the side of the lever-arm B10, so that as the armature is attracted to the magnet-pole as the latter is energized the movement of said lever-arm carries said abutment against said cam-lever E and swings it, and thereby rotates or rocks the drum C', coils the mainspring l), reti-acting the ratchet-rim C10 under the pawl C00, which engaging said ratchet holds the spring coiled and also receives and transmits through the retainingwheel c2, retaining-spring C, and primewheel C2, the coiling impulse by which the time-train is actuated as the spring runs down.

M is the main shaft of the striking-train, and M the mainspring-drum, loose on the shaft M.

M10 is a ratchet-wheel rigid with the drum M.

N is a lever-arm having an eye n, by means of which it is journaled or vfulcrumed on the drum MC Nl is a pawl pivoted at n to the lever N and having a nose n10, engaging the segment ratchet-disk m10, rigid with the ratchet-disk M10. Said pawl N is extended in two camfork arms N10 and N11.

M2 is the prime-wheel of the striker-train. It may be set fast on the shaft M if said shaft is journaled on the plates of the frame, as it is designed to be shown in the drawings.

M20 is a pawl pivoted on the wheel M2 and engaged by the ratchet-disk M10, and thereby said ratchet-disk communicates the action of the drum to the main Wheel and thence to the striking-train.

P is the mainspring of the striking-train, attached at one end to the drum M/ and at the other end to the train.

The striking-train is wound by the same action as the time-train--that is to say, by the same movement of the armature and armature-lever; but, as will appear in the following description, the striking-train will not receive a winding impulse at every instance of winding of the time-train, for while the running down of the time-train is uniform and the rewinding of the same occurs when it has run down to a certain point, as will be understood from the description of the winding mechanism above and the circuit making and breaking devices hereinafter described, this is not true of the 'striking-train, which will in the small hours run down very slowly and in case of an hour of higher denomination very rapidly, so that if the first winding impulse which occurs after the stroke of twelve, for example, is sufficient to fully wind up the striking-train it will not be fully run down, so as to require rewiuding, until. sevticaee eral of the small hours are struck, and if it were so constructed as to receive a winding impulse every time the time-train is wound would be overwound during the small hours. The abutment-roll B11, by means of which the time-train is wound, as above described, also engages in the slot or notch N12, between the fork-arms N10 and N11 of the pawl NQ which is fulcrumed, as described,on thelever-arm N, which is in turn fulcrumed on the drinn M. From the lever-arm N extends a finger N0, behind or under the stud B11, alongside the forkarm of the pawl-lever N', and said finger N3 is engaged and actuated by the armature-lever arm in the withdrawing or retreating movement of the latter and is so located that its forward or upper edge, against which the stud bears at the position of rest, stands coincident with the rear or lower edge of the slot or notch in the pawl N when the nose n10 of the pawl is lifted out of engagement with the ratchet-disk m10. (See Figs. l and 3.) `From this construction it results that when the armature is drawn toward the magnet, as the latter is energized and the lever-arm B1" of Ithe armature is swung to the right in its actuating movement it first throws the pawl N' down onto the ratchet-disk m10, and when it is stopped on that disk (see Fig. the arm N11 of the pawl opera-tes as an arm of the lever N, and the further movement to the right of the armature-lever arm swings the lever N about its fi'llcrum-that is, about the axis of the shaft M-and the pawl N', moving as rigid with the lever N and engaging with the ratchet disk m10, communicates movement to the striking-train mainspringdrum, the pawl M20 meanwhile riding over the ratchet M10 and retaining the drum against reversing and in the running action ot' the striking train communicating the movement of the drum under the recoil of the spring to the prime-wheel M2 and to the entire strike-train. lf the nose 91,10 of the pawl N when thrown forward. by the action described lodges on the smooth or untoothed part of the ratehet-diskm10, it will slide over it, producing no winding action; but if it fall into the toothed portion of said ratchet-disk it will wind said striking-train, as desired. The disk m10 is toothed only over such an extent as necessary to insure sufficient winding to cause the striking-train to run long enough to strike twelve, making reasonable allowance for friction to insure uniform speed throughout the entire number of strokes, and since the time-train is wound at least as often as once in twelve minutes the striking-train will also be wound after each striking action, even though the clock is arranged to strike quarters. lt will be understood that the interruption of the ratchet-teeth over a portion of the circumference of the disk m1" is necessary in order that the action of the pawl, which is simultaneous with that of the pawl which drives the time-train-windin g mechanism, may not overwind the striking-train or winding IIO by winding it to the limit prevent the action of the winding-lever upon the time-train. This will be liable to occur in the absence of any provision, such as described at all the small hours, for striking which only a small amount of winding of the striking-train is necessary, whereas the time-train requires and receives the same number and duration of winding impulses for each hour.

It will be noticed that the lower edge of the arm N11 of the pawl N', on which the abutment B11 of the armature-lever rides, is substantially straight throughout the entire distance traversed by said abutment in the winding movement, and at a certain point, which may be termed the culminating point of the movement, the three centersto wit, of b', B11, and M-are substantially in line, so that the point of contact between the abutment and the leveris at that stage nearest the center of the shaft M, and the direction of action on the lever is substantially at right angles to the same, both these conditions-that is, proximity to the center and direct action of the lever-arm-being favorable to deriving relatively large angular or winding movement from relatively small swinging movements of the armature-lever. This condition, it will be observed, is the reverse of, or at least may be contrasted with, the condition which obtains at the commencement of the winding movement, the abutment encountering the lever-arm N11 by a movement at an oblique angle thereto and at the extremity remote from the shaft M. This gain in leverage from the commencement to the end of the winding action is designed to correspond to the gain in attraction of the magnet for its armature as the latter approaches the poles of the former, this attraction being least at the commencement of the movement and increasing rapidly as the armature approaches the poles. This adaptation of the device to the force derivable from the magnet to operate it makes it possible to utilize most fully the energy of the magnet in the winding` action, the amount of winding done by each degree of action of the armature about its fulcrum b being approximately proportional to the pull of the magnet upon the armature. To effect perfect adaptation of the parts, account should be taken also of the slightly-inincreasing tension ofthe spring as it is wound; but with a spring of the form shown, consisting of a coil of wire of very considerable length in proportion to the amount of winding required, this element of the operation probably requires little consideration.

A stud b on the side of the armature-lever B, near its lower end, engages a hook-nose N30 on the end of the lever-finger N3 of the pawl N at the position of rest in the intervals in the winding action, and the winding-lever and the armature-lever thus mutually stop each other at the proper position. It will be noticed that at this stopped position of the armature-lever the abutment B11 holds the pawl N with its nose 'n10 a little way from the ratchet-disk m10. This is for the purpose of permitting the initial part of the movement of the armature under the impulse of the magnet when energized to be performed without doing any work in respect to winding. The slight momentum gained during this slight interval enables the armature to take up the lever when it encounters it promptly and without appreciable loss of impetus. It will be noticed also that the abutment-rollB11 encounters the lever-arm l 11 and swings the latter through the greater portion of its winding movement before it encounters the lever-arm B for the purpose of winding the time-train and that the movement of the abutment during its action upon the lastmentioned lever carries it back along the straight edge of the lever-arm N11 toward the end, diminishing the resistance of said arm, which at this stage of the action is at such an angle to the armature-lever that it receives a diminishing movement from the latter. By this means I avoid loading the armature with the work of both windings at the same time or at least cause the two actions to overlap only at a portion where the requirement of one is slight and diminishing and that of the other is relatively slight, but increasing.

In Fig. 8 Ihave shown a form of cam-lever for Winding the time-train in which the camtrack is substantially a straight edge, as in the case of the lever-arm N11. In this modiied form e denotes the cam-lever, e being the straight edge constituting the cam-track. Following the action of this form of device it will be noticed that at the wound position or culmination of the winding action the abutementroll B11 of the armature-leverbears against the edge of the cam-track e at a point very near the shaft, the armature being at this stage at the point of its nearest approach to the inagnet-poles and the attraction of the armature for the magnet being greatest; also,that at said position a tangent at said point to the curved path of the abutment about the fulcrum of the armature-lever is substantially at right angles to the radius of the winding-shaft at the same point. This gives the armature-lever at the point at which the power of the lever is maximum a minimum leverage on the winding-shaft, and as the armature retreats from the magnet the winding-shaft revolves under the action of the windingspring and carries the lever-arm back toward initial position. The point of bearing of the abutment on said lever-arm retreats -from the axis of the shaft M toward the end of said lever-arm and at the full line of the lever-arm, as seen, which may be taken as the position at which it will have arrived in the running of the train to the time the contact devices operate to close the circuit, the abutment is operating upon the shaft with the advantage of long leverage, while the force of the armature upon the magnet is least, and that as the abutment travels in IOO which makes a right angle with that face, and this advantage is greatest, as l judge,

when the face of the cam-track substantially radial to the shaft. Uitherwisc stated, the most desirable conditions are 'that the chord .of the arc through which the abutment moves in its winding action shall make an acute angle to the radius of the shaft ai, drawn from the point at which the winding action commences, and that the cam-trai'ek c shall be substantially in such rad'wl liuc, the length ofthe armature-lever from the fulcrum to the abutment being enough greater than the distance from the center ofthe shaft M to cause the abutment to pass beyond the shaft as the lever-arm swings in toward the latter, the arm being suitably reset or curved to permit it to do so. '.ihis construction rei duces the friction between the abutment and the cam to the minimum for a given amount of work and is most easily adaptable to the increasing pull of the magnet upon its armature as the latter approaches the former and to the changing tension oi the spring as it is wound.

l will new describe the coi/itact-makiug devices for opening and closing the electric circuit by which the magnet is energized. These devices comprise two parts, the first part being a laterally-resillent spring-lever K, pivoted without insulation on 'the frame at 7a, having a spring-arm l, resilient in plane transverse to the pivot, "topped against a stud 7.1 on the frame, the second element being fast on the main shaft C of the timetrain. lhis second element comprises an insulated disk S and an uniusulated switch-- disk S. rllhese two disks, with insulating mr.- terial S2 between them, and the insulatingring S3 at the center of the insulated disk il are secured 'together rigidly by means o' a hollow rivet si?, passing through them both the center of the disk and a second rivet s at a little distance from the center.. [in insulating-ring S, surrounding the rivet s?, insulates the plate from the rivet, and the l n'a1-;;; plate S, provided at the outer side of the insulated disk, insulated therefrom by the insulating layer S20, (see Fig. 7,) affords means for heading down both the rivets si; and s? at that side, the disk S serving a like purpose at the opposite side. rihe rivetssis hollow, that it may be adapted to serve as the bearinf or seat of the entire device made up el' the i i and their insulating-riugs, as def-acribed, er. the end of the shaft C which projects through the rear frame plate ff. for that pur ose.

.A stud SU projects V.forward from tin-i plate il lthrough the skeleton rear frame-plate and engages the lever-arm CN, (see F10. 23,) which made rigid with the shaft C at the rear end the inainspring-druin C, and by that engagement the contact element S S is renf red subsnautially rigid with the shaft C- de that is, so that it rotates or rocks with said shaft. ji suitable cottcr-pin c10 is provided to retain it on the shaft against a suitable sho'ulder all. The insulated disk S has a rearwardly-projccting stud s, with which the condnoting-wire is connected, said wire running from one end of the magnet-coil, while to the other end of that coil-wire the circuit-wireflj leads from the batter-yor other source of electric energy. L2 is an electriccircuit wire connected to the frame at any convenient point and designed to lead to the other pole of the battery or other generator. The insulated disk S' is thus in electric circuit with the generator and electromagnet. ln the upper edge ot' the disk S' there is a groove s, which is in the plane of the leverarm, so that the spring-arm K of said lever teniv s to hold the edge of the lever normally lodged in the groove of the disk when the disk is in such position that the disk Vfaces toward the edge of the lever. The disk is, however, cut away obliquely at-.SU at the rear side, the bevel taking off the guardge of the groove at the rear sido, so that I .cu the disl rocked with the shaft to a posiiion at which the lever lodged in the .7, roove rcache said bevel the lever is `forced l y,reaction of its spring-arm lil to slide down the bevel face of the disk and become lodged 'the edge oi the insulated disk S. This :ed disk boing in a circuit with the elecnet and 'the generator and the circuit being at all times complete, except as to connection between said disk and the frame, and this connection being made by the contact of the spning-li-n'or T with the disk, the electromagnet is ener ized and the armature attracted, the winding action hereiubeforc described is performed, and in the rocking of the shaft l in .such winding action the element S S is rocked, causing the edge of the ik S, which is eccentric to the owd the spring-lever li back as he lever passes by the rear guard- 'ie groove in the dis; S', and as it has passed this guard the lever-arm,

l be seen., th, reii'ore, that the winding will occur as often as the running of the train carries tuo shaft back again to an equal angle to thc IIO point at which the end of the lever will be forced down the bevel of the switch. It will be noticed that the spring-lever K is so 1okcated in respect to the axis and periphery of the switch-disk S on which it bears during the running down of the train that its pressure thereon is not directed toward the axis, but in a direction non-radial in respect thereto, and particularly that it operates in a direction tending to rotate the disk, and therebythe shaft C, in the direction in which said shaft rotates or rocks in the running movement of the time-train. The eifect of this arrangement is that the pressure of the contact spring-lever K assists the running of the train, whereas if its pressure were otherwise directed it would act as a brake upon the train and retard it, which would make it necessary to employ such exceedingly-light tension in such spring as to render the operative adjustment too delicate or sensitive to be reliable. With the present construction the contact-spring may be made a supplement to the motor-spring. Another feature which will be noticed is that the periphery of the switchdisk S throughout the portion on which the spring-lever bears in the running action of the train is eccentric with the radins, diminishing from the point at which the lever bears at the commencement of the running to the point at which the lever is deflected by the bevel of said disk onto the other. The effect of this, independently of the direction of the levers pressure on the disk, above stated, Would be to give the spring a slight driving eect on the disk and shaft, which would in part counteract its effect as a brake. It will be noticed also as a feature of importance in this contact making and breaking device that the circuit is broken and the current interrupted as soon as the necessary winding movement has been imparted, so that if the current is strong and the Winding impetus imparted by the magnet to the armature is such as to cause it to make a quick stroke the circuit is broken correspondingly sooner and the circuit is used a correspondingly shorter time than when the battery is Weak and the action of the armature correspondinglymore sluggish, thus preventing waste of current when the battery has been freshly charged, as is liable to occur in any construction in which the duration of the contact is fixed and dependent upon the running of the train rather than upon the time necessary to give the Winding impulse.

l. In an electrically-wound clock, an electromagnet and the circuit in which it is energized; a striking-train and its motor and winding device; mechanism by which the electromagnet operates the winding device; said winding device comprising a non-continuous ratchet which is actuated in one directionin the winding action and in the reverse direction in the running down of the train.

In an electrically-Wound clock, an electromagnet and the circuit in which it is energized; a strike-train and its motor and winding device; mechanism by which the electromagnet operates the winding device, said device comprising a non continuous ratchet which is actuated in one direction in the winding action and in the reverse direction in the running down ofthe train; a pawl engaging the ratchet in the direction for winding up, and means for causing the pawl to be Withdrawn out of the range of the ratchet in its retracting movement.

3. In an electrically-wound clock, an electromagnet and the circuit in which it is energized; a time-train and a striking-train and their respective motors and Winding devices; mechanism by which the electromagnet operates both winding devices; the winding device of the striking-train comprising a noncontinuous ratchet which is moved in one direction in winding up, and in the opposite direction in the running down of the train.

4:. In an electrically-wound clock, an electromagnet and its armature, and the circuit in which the magnet is energized; a time-train and a strikingtrain, and their respective motors and winding devices; mechanism by which the same movement of the armature winds the motors of both trains; the winding device of the striking-train comprising a noncontinuous ratchet which is moved in one direction in winding up and in the opposite direction in the running down of the train.

5. In an electrically-wound clock, an electromagnet and its armature, and the circuit in which the magnet is energized; a strikingtrain and its motor and winding device, and means by which the movements of the armature operate said winding device; the latter comprising a non-continuous ratchet-wheel which is actuated in one direction in the winding action and in the opposite direction in the running down of the train; and a pawl for engaging the ratchet in the direction for winding up; and means for causing the pawl to be Withdrawn out of the range of the ratchet in its retracting movement.

6. In an electrically-wound clock, an electromagnet and a circuit in which it is energized; a time-train and a striking-train and their respective motors and winding devices; the armature of the electromagnet and a lever-arm extending therefrom actuating the winding-up devices of both trains; circuit making and breaking devices in the time-train for periodically causing the magnet to be energized; the winding devices of the strikingtrain comprising a non-continuous ratchetwheel which is actuated in one direction in the winding action, and in the reverse direction in the running down of said train; and means causing the pawl to withdraw out of the range of the ratchet in its retracting movement.

7. In an electrically-wound clock, in combination with the Winding shaft and the ratchet thereon, a lever fulcrumed on the IOO shaft and a pawl fulcrumed on the lever; the winding-magnet and its armature; the leverarm on the armature having an abutment which engages with the pawl in the winding movement in dircction to throw it into winding engagement with the ratchet, whereby the lever is actuated through the medium of the pawl after the latter is engaged by the ratchet, and the reverse movement takes the pawl out of the range of the ratchet.

8. ln an electrically-wound train, in combination with the winding-shaft and ratchet thereon, a winding-lever; a step for its retreating movement; a pawl fulcrumed on the lever; the armature-lever arm arranged to encounter the pawl in the winding movement and throw it into engagement with the ratchet; said pawl having an arm which is actuated by the armature-lever in its retreating movement to hold the pawl ont of engagement with the ratchet after the winding-lever is stopped.

0. ln an electrically-wound clock, an electromagnet and the circuit in which it is energized; the winding-shaft drum orbarrel, and the lever-arm for rotating the same to wind the motor device; said arm having a camtrack or face which is substantially straight; the armature of the electromagnet, and leverarm extending therefrom, having an abutment which bears against the straight face or cam-track of the winding-arm; the proportions of the parts and the relation of the armature-lever tulcrum to the winding-shaft axis being such as to cause the abutment on the armature-lever to move in a path whose chord makes an acute angle with the position of the straight face or cam-track of the winding-lever at the commencement of the winding action, and a greater angle, approximating a right angle therewith, at the culmination of said action.

lO. ln an electrically-wound clock, an electromagnet and the circuit in which it is energized; the winding-shaft drum or barrel, and thelever-arm for rotating the same to wind the motor device; said lever-arm having a camtrack or face which is substantially straight and radial to the shaft; the armature-lever having an abutment which bears against the said radial face or cam-track of the windinglever; the length of the armature-lever arm being suiliciently different from the distance between its fulcrum and the winding-shaft axis to permit the abutment to clear said shaft as the lever swings in toward the latter in its winding action, whereby the path of the abutment makes an acute angle with the radial face of the lever at the commencement of the winding action, and approximately a right angie therewith at the culmination of said action.

1l. In an electrically-wound clock, an electromagnet and the circuit in which it is energized; a time-train and a striking-train, and their respective motors and winding devices;

the armature of the electromagnet, and a lever-arm extending therefrom, and windinglevers for the winding devices ofthe time and striking trains respectively, arranged to be encountered by an abutment on the armaturelever as the armature approaches the magnet, the parts being so disposed that the points of contact of the abutment with the levers lapproach the shaft respectively in the winding action, and so that the encounters of the armature-lever with Isuch winding-levers are successive and not simultaneous; the winding-lever iirst encountered being so disposed with respect to the armature-fulcrum that the abutment passes the point of nearest approach to the shaft and commences to recede therefrom before the culmination ofthe winding movement of the other shaft.

l2. ln an electrically-wound clock in combination with the winding mechanism and the electric circuit for energizing it a contact making and breaking device comprising two contacting parts, one in said circuit, and the other not in the circuit, one of said parts being r0- tated with the train, and the other elastically pressed upon such rotating part in a direction tending to rotate the same.

13. ln an electrically-wound clock in combination with the winding device and the electric circuit in which they are energized; a contact making and breaking device comprising two parts in the circuit one of which is elastically pressed upon the other; and a third part, not in the circuit, which is rotated by the running of the train and which holds the elastically-pressed part out of contact with the other during the intervals between winding, the pressure of said elastically-pressed part operating on said third part in direction tending to rotate the latter.

l-l. ln an electrically-wound clock, an electromagnet and the circuit in which it is energized; the time-train and its motor, and means by which the movement of the magnet-armature winds said motor; a contact making and breaking device, comprising an element carried by a shaft of the time-train, consisting of a disk connected in the electric circuit and a dellecting-disk in juxtaposition thereto not in the circuit; a spring-'linger in the circuit pressing` elastically toward the periphery of the detlecting-disk and elastically dei'lectable laterally from the plane of said disk; said detlecting-disk having a lateral bevel tending to deflect the finger onto the periphery of the circuit-disk, said disks being of equal radius at a distance circumfer- 'entially from the foot of the bevel; whereby the spring-linger is permitted to react laterally oil' from the circuit-disk onto the dellecting-disk when the disks have rotated through the angle between the foot of the bevel and said point of equal radius, the spring-linger being disposed with respect to the periphery of the dellecting-disk so as to press thereon non-radially and in the direction in which.

IOO

TIO

the disk rotates in the running movement of the train; whereby said pressure assists such running movement.

l5. In an electrically-wound clock, au electromagnet and the circuit in which it is energized; a time-train and its motor; and mechanism whereby the magnet-armature winds such motor; a circuit making and breaking,r device, comprising an element carried by the shaft of the time-train, consisting` of a disk connected in the electric circuit and a deflecting-disk in juxtaposition thereto not in the circuit; a resilient finger in the circuit pressing toward the periphery of the deflectingdisk and elastically deliectable laterally from the plane of said disk; said deiiecting-disk having a lateral bevel tending to deect the finger onto The periphery of the circuit-disk, said disks being of equal radius at a distance -Bristol, Connecticut, this 28th day of February, A. D. 1901.

CHARLES M. CROOK.

In presence of- PERCY L. CLARK, ALICE E. BROWN.

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