US585301A

US585301A - Electric tower-clock

Info

Publication number: US585301A
Authority: US
Publication date: 1897-06-29
Anticipated expiration: 1914-06-29

Description

(No Model.) 4 Sheets-Sheet 1.

T. H. WURMB & R. BAUMANN. ELECTRIC ToWEE oLoEK.

(No Model.) 4 Sheets-Sheet 2.

T. H. WURMB & R. BAUMANN. ELECTRIC TOWER GLocK.

No. 585,301. Patented` June 29,1897.

4 Sheets-Sheet 3.

T. H. WURMB & R. BAUMANN. ELECTRIC Tow-BR CLOCK.

No. 585,301. Patented June 29, 1897.

(No Model.)

(No lionel.) 4 sheen-sheet 4. T. H. WURMB 8u R. BAUMANN.

n ELECTRIC TCWER CLOCK. NC. 585,301.

Patented June 29,` 1897.

UNITED STATES PATENT OEEicE.

THEODORE Il. VURMB AND ROBERT BAUMANN,y OF S'l. LOUIS, MISSOURI.

ELECTRIC TOWER-CLOCK.

SPECIFICATION forming part of Letters Patent No. 585,301, dated June 29, 1897. Application iiled May 18, 1896. Serial No. 591,998. (No model.)

Be it known that we, THEODORE H/VURMB and ROBERT BAUMANN, of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in Electric Tower- Clocks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a pa rt hereof.

Our present invention relates to the .construction of electromechanical clocks of large dimensions, such as sign and tower clocks, and the mechanism for operating said clocks, and also the system of electrically operating' such mechanism.

The object of our invention is to provide a machine of the most simple construction, positive in its operation under all conditions and circumstances, and the most economical in the use of the electric current supplying the power. Following out this general object, we have constructed a device which may be operated with less electric current than would be required to even start the armature of an electric motor of a size capable of operating the clock.

In the drawings, Figure l. is a top plan View ol our improved mechanism for operating tower-clocks. Fig. 2 is a side elevation of the parts shown in Fig. 1. Fig; 3 is a vertical transverse sectional view on the lines 3 3 of Fig. 1, looking in the direction as indicated by the arrow. Fig. 4 is a vertical transverse sectional view on the lines -fl 4 of Fig. 1, looking in the direction as indicated by the arrow. Fig. 5 is an elevation, partly in section, of our improved tower-clock and our improved mechanism for operating the same. Fig. 6 is a transverse sectional view on the lines o 6 of Fig. 1. Fig. 7 is a diagrammatic view showing the course of the electric currents through the mechanism of our improved tower-clock and the connections between said mechanismfand the master-clock. Fig. 8 is a side elevation showing an enlarged detail view of the electrical connections to the master-clock and its location relative to the shal't of the seconds-hand of said clock. Fig. 9 is a top plan view of the part shown in Fig. 8.

Referring to the drawings by numerals, the

power mechanism is mounted on the table 1.

rlransversely-alined post-s 2 project upwardly from near the center of said table 1, and in bearings in said posts is journaled the shaft 3, upon which is mounted the worin-gear l between said posts. Below the table l and attached thereto are

brackets

5 and 6, and in the lower ends of said brackets are longitudinally-alined bearings in which is mounted the shaft 7, upon the center of which is positioned the worin-gear 8, which meshes into and is driven by the worm-gear i, as shown in Fig. 6.

Near one end of the shaft 3 and outside of the bearings 2 is xed a ratchet-wheel 9. Two non-magnetic brass brackets 10 and 11 are secured to the table 1 and project upwardly therefrom and carry two horseshoe electro`

magnets

12 and 13,- one above the other and in a horizontal position. At the ends of the magnets l2 and 13, opposite the brackets 10 and 11, are non-magnetic brass brackets 11 and 15, and a shaft 1G is journaled in the upper ends of said brackets and transversely of the machine.

Vertical bars 17 and 1S are attached at their centers to the shaft 16, and the upper ends-of said bars are connected by the armature 19 of the electromagnet 12, and the lower ends of said bars are connected by the armature 2O of the electromagnet 13. A pawl 21 is attached to the end of the armature 19 by the screw 22 and extends longitudinally of the machine and engages the teeth ot' the ratchet-wheel 9, and a similar pawl 23 is attached to the end ot' the armature 2O by a screw 2i, and also engages the teeth of the ratchet-wheel 9.

By a system of alternating currents, which will be explained later, the armatures 19 and 2O are attracted alternately, thus imparting 'a rocking motion to the bars 17 and 1S and the shaft 16, and by this means thepawl 21 is pulled backwardly when the pawl 23 is pushed forwardly, and vice versa. This rocking motion operates the ratchet-wheel i) and im'parts motion to the worm gear 4: and through its connections to the clock in the tower. The teeth of the ratchet-wheel 9 are preferably one-eighth of an inch apart and of an even number. The range of motion between the armatures and the face of the cores is proportionate to the distance between the teeth ot' the ratchet-wheel. The pawl of IOO that armature opposite that one which is being attracted pushes the ratchet-wheel a distance equal to one-half of a tooth, and consequently it requires two motions ot each armature, one backward and one forward, to push the ratchet-wheel the distance of one tooth. By switching the electric current in such a way as to cause the armatures to operate alternately a continuous vibrating motion is imparted to said armatures and through the pawls and their connections to the clock, as bet'ore described.

rlhe table l is preferably made of iron, and behind the brackets lO and ll a base 25, made of slate or marble, is rigidly secured to said table l. There is an opening of suitable size in the table l underneath the base for suitable electrical connections with the different parts mounted on said base.

A lug 26 is secured to the inner face of the lower armature 20, and a bar 27 is pivotally connected to said lug QG and extends longitudinally of the device and between the coils ot the lower magnet 13 to a position above the base 25. In the rear end of the bar 27'is a pin 28, projecting upwardly through the slot 2) in the free end of the switch-lever 30, as shown in Fig. l. There is a sliding connection between the rear end of the bar 27 and the base 25. A plate 3l is secured to the base 25, and apin passes downwardly through the end of the switch-lever 30 and the plate 3l and is iixed in the base 25. Upon the upper surface of the switch-lever St) and surrounding the pin 32 is a collar 33, and on top of said collar is a washer 3l, and on top ot said washer il is a spring-washer 35, and on top ot said spring-washer is a nut 3G, by means of which the pressure upon the switch-lever FEO is regulated. rlhe tree end of said switch-lever ESO is provided with an upwardly-projecting lug` 37, carrying the longitudinally-extending horizontal contact-pin 23S, said pin being provided at each end with platinum contact-points 50 and l0.

rihe mechanism just described is necessarily very iinely adjusted. The bar 27 travels backwardly and forwardly about oneeighth of an inch, or a distance equal to the vibration of the armatures, but by means of the slot 2),in which the pin 28 operates, there is lost motion between the bar 27 and the i'ree end of the switch-lever SO, which allows the armatures to almost strike the cores before the pin moves the switch-lever 30. Mounted upon the opposite end of the base 25 from the pin 32 are binding-posts stl and t2, to which are attached coppercontact-springs-t and l-t, said springs being horizontally positioned transversely of the machine and having their free ends adjacent to the platinum contact-points 3S) and i0, as shown in Fig. l. losts i5 and i6 are positioned between the free ends of said springs t3 and al, and setscrews t7 and 4S are screw-seated in said posts l5 and a6 in a horizontal position with the points of said screws against the inner faces of the ends of said springs, and the distance between the ends of said springsis adjusted and determined by said set-screws. The switch-lever 30 and the parts connected to it are of brass orbronze. The sides of the slot 29 are protected from the strokes of the pin 2S by a hardened-steel plate t), having a corresponding slot, which steel plate is secured to the switch-lever 30. The length of the slot 2O is approximately one-sixteenth of an inch less than the range of motion of the armatures plus the thickness oi the pin 2S. The bar 27 is cut in two on the dotted lines 27 and a piece ot insulation 27b is inserted to connect the two ends of said bar and thus insulate the pin 2S from the lug 26.

The copper springs i3 and il are so adjusted relative to the contact-points Si) and O that when the point 39 is in contact with the spring -tl the point O is out of contact with the spring 43, and vice versa.

The operation of the bar 97 by the armatures operates the switch-lever 30 through the pin 2S, working in the slot 20, and thus operates the pin 3S to alternately break the circuit attached to the spring i153 and close the circuit attached to the spring il, and vice versa. It the lower armature be moved by hand slowly against the core of its magnet, the pin 2S pushes the switch-lever 30 backward, connecting the contact-point 30 with the spring 44 and disconnecting the contactpoint from t-he spring i3, and the switchlever remains in this position under pressure of the spring-washer lf the upper armature be moved against its magnet, the contact-point 30 leaves the spring -t-tand the point 40 connects with the spring i3 and is held there by the pressure of the springwasher 35 until the lower armature is moved again.

In adjusting the springs i3 and il with relation to the contact-points 39 and it) the switch-lever 30 is placed in its central position, and then by means of the set-screws -t7 and -tS the springs i3 and al are adjusted to press lightly against the contact-points 30 and stO. lVhen a connection has been adjusted in this way, the operation of the switchlever SO pushes the one of the copper springs which is in contact with one of the points away from the set screw controlling that spring, as shown in Fig. l. rllhe set-screw controlling the opposite spring holds the spring which rests against that set-screw from Afollowing the pin 3S in its travel. Mounted upon the table l, upon the opposite side of the post 2 from the mechanism just described, is a bracket 50, which carries the electromagnet l and forms the yoke of said magnet, the coils of said magnet being arranged one above the other. The magnet acts as a relay, its operation closing the circuits which operate the magnets l2 and i3. The bracket 50 extends upwardly to a point above the upper edge of the magnet 5l and then longitudinallyot said magnet to a point in trent of the IOO cores of said magnet. The armature 52 is pivotally connected to the upper end of the bracket in position to be operated by the cores of the magnet 5l. Attached to the u pper surface of the bracket 50 is a bindingpost 53, through which operates the screw 54, which screw is controlled by the nut 55, and to the head of the screw 5e!E is attach ed a retractile coil-spring 50, which spring is attached at its opposite end to the bar 57, which bar is attached to and projects upwardly from the armature 52. The tendency of the coilspring 5G is to pull the armature 52 away from the faces of its core. f

Mounted upon the shaft 8, adjacent to the ratchet-wheel 9,`is a disk 58, having a notch 59 cut in its periphery.. A ratchet tooth or lug GO is attached to the front face of the armature 52 and is designed to engage the notch 59 in the disk 58. Pivotally attached to the outer face of the disk 58 by the screw 6l is an A-shaped dog G2, the large end of which extends outwardly from the axis of the disk. A pin G3, projecting outwardly from the face of said disk 58, limits the motion of said dog (52 in a forward direction, and the edge of said dog strikes against the hub Gt of the disk 58 to limit its motion in a backward direction. Projecting outwardly from the face of said dog is a pin G5, designed to be engaged by the lever 6G, which is pivoted to the armature 52.

Projecting upwardly at an angle from the pivot of the lever (5G is a short arm 67, in which is mounted a pin 68, designed to engage the back side of the armature 52, and thus limit the downward motion of the free end of the lever 6G. On the lower surface of the lever G6 is a ratchet-tooth 69, designed to engage the pin on the dog 62. Assuming that the ratchet-tooth GO is in the slot 59, then the dog G2 will be in a vertical position with one side resting against the hub Get of the disk 58 and the ratchet-tooth G9 will be in contact with the pin G5 on the dog G2, as shown in Fig. 2. When the mechanism is in this position, the armature 52 is held out of contact with the core of the magnet 5l by the tension of the spring 5G acting' upon the lever 57. lVhen the magnet 5l is energized, the armature 52 is attracted against the face of its cores, and this motion of the armature moves the ratchet-tooth G9 quickly toward the magnet 5l, and by this motion the dog 62 has its large end moved away from the hub (la and out of a vertical line and by the force of gravity is carried downwardly until it strikes the pin 93. When in this position, the outer face of the dog (l2 rests against the face of the armature 52 beside the lug GO and holds said armature against the cores of the magnet 5l until the disk is rotated to such an eX- tent that the ratchet-tooth GO rests upon the circular periphery of the disk 58 and is out of engagement with the notch 59.

Projecting from the lower end of the armature 52 and in a position parallel with the l shaft 3 is a pin 70, upon the outer end of which is mounted a hard-rubber collar 7l. Near the opposite end of the shaft 8 from the pin and approximately in line therewith a post 72 is verticallypositioned, and a springarm 7 3 is attached to said post and has its free end normally in engagement with the rubber collar 7l on the pin 70, Between the post 72 and the magnet 5l is mounted a binding-post 74, in which is transversely positioned a set-screw 75, and a pin 76 is longitudinally positioned in said binding-post and designed to be engaged by the inner end of the set-screw 75. Upon the point of the pin 76 is a platinum contact-point 77, adjacent the springarm 7 Electric wires are attached to the table l by the

posts

72 and 74, and the connection between said wires is made through the spring-arm 7 3 and the platinum point 77, and said connection is broken or closed by the action of the armature 52 operating the pin 70 and the collar 7l'and thereby vibrating the free end of the springarm 7 3 against and away from the platinum point 77, as shown in Fig. l.

Upon the shaft 7 to the left of the wormgear 8 is mounted a bevel-gear 78, which meshes into a bevel-gear 79. Extending upwardly from the table l upon the side of the magnet 5l opposite the shaft 3 is a bracket 80, carrying the Vertically-alined bearings 8l and 82, in which is mounted a shaft 83.

Upon the lower end of the shaft 88 and below the bearing 82 is a collar 84, Yfixed to said shaft, and immediately below said collar is a collar 85, rotatably mounted upon said shaft, and the bevel-gear 79 is fixed to the lower end of said collar. Immediately above the hub of the gear 79 and fixed to the collar 85 is a disk 86, in the periphery of which are evenlyspaced recesses, preferably sixty in number. An arm 87 projects horizontally from the collar 84 to a position in vertical alinement with the periphery of the disk 86, in the outer end of which isa vertically-positioned pin 88, designed to engage the recesses in the periphery 'of the disk 86, thus forming a connection between the shaft 7 through the bevel-

gears

78 and 79, the collar 85, the disk 8G, the pin 88,

Upon the upper end of the shaft 83 is abevelgear 89, meshing into the bevel-gear 90 upon the shaft 91, which shaft operates a dummy clock of ordinary construction. (Not shown.) Upon the extreme upper end of the shaft 83 is a universal joint 92, connecting with the shaft 98, and upon the upper end of said shaft 98 is a second universal joint 94.-., connecting with the central gearing of the clock mechanism, as shown in Fig. 5.

In order to give properly-spaced electrical impulses to the mechanism heretofore dcscribed, we employ a master-clock, which may be located in any desired place and connected by electric conductors with the clock mechanism. For this purpose we place upon the front plate of the clock-frame the block the arm 87, and the collar 8i to the shaft 83. y

IOO

IIO

of rubber 00, which block is attached to the clock-frame by the screws 07 and 0S, working in the slots 09 and 100 in said rubber block. Attached to the outer end of said block is a bar 101, in the lower end ot' which is positioned a screw 102, to which the end of a conductor is attached. At the upper end of the bar 101 are the

lugs

103 and 101, between which is mounted the nut 105, and a screw 106 is positioned horizontally through said lugs and said nut. To one of the outer ends of said screw 10G is attached a leaf-sprin g 107, which rests upon the upper surface of said block 0G and projects beyond the end of said block. A lug u103 projects upwardly from said block 00 to a point over the spring 10 7, and a set-screw is screw-seated in said lug with its point engaging the upper surface of said spring 107. By means of the screw 109 the pressure of the spring 107 a-gainst the upper surface of the block 06 may be regulated, and by means of the nut 105 operating between the

lugs

103 and 101 upon the screw 10G the position of the free end of said spring 107 may be finally adjusted.

A tube 110 is mounted upon the secondshand shaft 111 of the clock. Platinum points 112 and 113 project in opposite directions from said tube 110, and the under surface of the free end of the spring 107 has a thin sheet of platinum and is so positioned that a contact is made between said spring 107 and the platinum points 112 and 133, one each halfminute.

Then the seconds-hand upon the masterclock passes the minute-mark, the contactpoint 112 engages with the end of the spring 107, the contact lasting a fraction of a second, during which time part of the electric current passes from the battery 111 along the wire 115, and from said wire 115 through the wire 11G to the frame 05 of the master-clock, and through the tube 110, the contact-point 112, thelspring 107, and through the wire 117 to the coils of the magnet 51. The armature 52 is then attracted to the cores of the magnet 51, and this motion of the armature 52 carries the free end of the spring 73 into contact with the platinum point 77. Making this contact closes the circuit through the

magnets

12 and 13 and the current passes from the battery 111 over the wire 115 tothe binding-post 113, which is attached to the plate 31, then through the pin 32 to the switch-lever 30, then through the pin 3S and from the contact-point 10 to the spring 13, to the post 11, thence through the wire 110 to the coils of the magnet 13, which energizes the cores of said magnet and attracts the armature 20, the motion of which pushes the bar 27 to operate the switch-lever 30 away from the magnet 13, thus breaking the contact between the point 10 and the spring 13 and making the contact between the point 39 and the spring 11. Then the current passes through the spring 11 to the post 12, and through the wire 120 to the magnet 12, which energizes the cores of said magnet and attracts the armature 10, which movement pulls the bar 27 forward, moving the switch-lever 30 to break the contact between the point 30 and the spring 11 and renew the contact between the point 10 and the spring 13. When the platinum points upon the seconds-hand shaft of the master-clock contact with the spring 107, a part of the current, as before suggested, passes to the coils of the magnet 51, but as soon as this contact is broken the full force of the battery is directed through the magnets 12 and. 13. The continued vibration of the

armatures

19 and 20 act through the

pawls

21 and 23 to rotate the ratchet-wheel 0, thus rotating the wormgear 1, and through its connections operating the hands of the clock in the tower. From the magnet 12 the current passes to the binding-post 121 through the wire 122, and from the magnet 13 the current passes to said binding-post 121 tlirough the wire 123, and from said binding-post said current passes through the wire 121 to the binding-post 72, thence through the spring 73, through the point 77, through the pin 70, and thence through the wire 125 te the opposite pole of the battery 111. From the coils of the mag- .net 51 the current passes through the wire 126 to the binding-post 71 and thence through the wire 125 to the opposite pole of the battery111. Then the magnet 51 attracts the armature 52, as hereinbefore described, pulling the dog G2 out of balance and allowing it to drop down against the pin 03. Said dog G2 holds said armature 52 against the cores of the magnet 51 until the ratchet-tooth (i0 passes out of the notch 59 and rests upon the periphery of the disk 5S, as hereinbefore described. This operation holds the circuit leading to the

magnets

12 and 13 closed and in operation until the disk 5S has made a complete revolution, thus permitting the ratchettooth G0to again drop into the notch 50, thus allowing the spring 5G to operate upon the bar 57 and gulling the armature away from the cores of the magnet 51 and thus break the circuit tov the

magnets

12 and 13, when the mechanism will come to a standstill until the platinum points upon the shaft of the seconds-hand again contact with the spring, when the operation is repeated, as heretofore described.

There is lost motion between the points of the

pawls

21 and 23 and the teeth with which they engage, which allows the armatures operating said pawls to come close to their respective cores before operating the shaft 3. This gives the armatures a chance to get under motion, and the result is a Very strong pull or push upon said pawls. The moyement of the seconds-hand shaft of the masterclock controls the current which operates the magnet 51, and the movement of the armature 52 by the attraction of the magnet 51 and by the action of the dog 02 and the disk 5S controls the current which operates the

magnets

12 and 13. It it is desired that the clock IOC shall be operated only once a minute, then but one of the platinum pointsll2 and 113 is needed; but, on thek contrary, it it is desired to operate the clock every iifteen seconds four of said points would be required. Ii the clock and its connections to the shaft 3 are so geared that one revolution of the disk 58 moves the minute-hai'lds of the clock one minute audit is desired to move them oftener than once a minute, and consequently not so far at a movement, it is necessary that the disk 5S be constructed with notches 59, directly opposite each other, and with two of the dogs G2. This will operate the clock every half-minute and nieve the hands accordingly. If it is desired to change the construction to operate the clock every fifteen seconds, the disk 58 should be constructed with four of the notches 59 and four of the dogs 62.

The dog 62 operates entirely by gravity, except that it is given an overbalaneing impulse by the ratchet-tooth G9 when the armature 52 is attracted. Then the dog 62 is passing upwardly in its orbit, it is the force of gravity that brings it against the hub 64, and it is so constructed that it leans by gravity against said hub until overbalanced in the opposite direction, as before described.

The hands upon the dummy clock attached to the shaft 91 are in the same position relative to their dia-l as are the hands of the display-dials. Thus the operator in charge of the clock may know by looking at the dummy clock just w iat indication appears upon the displaydials. If it is desired to change this indication-1i. c., set the clock ahead or backward-the operator removes the pin 83 from engagement with the disk 86, and the con nection between the shaft 7 and the shaft 83 is thus broken, and by operating the arm 87 the clock may be set as desired, and then the pin 88 is again inserted in the disk 8G and the connection is again established.

In the construction of the mechanism herein` shown and described insulation may be applied wherever it is found necessary or beneiicial', and we do not deem it necessary to particularize in this respect further than we have done.

IVe prefer to make the worm-wheel 8 with one hundred and twenty teeth, two teeth for each minute-space upon the dial of the clock, and then one revolution of the worm 4 will rotate the worm-wheel S the distance of one tooth, and thus move the min utc-hand of the clock the space of one-half a minute. This gives the worm 4 great power and enables it to operate aV large clock under all conditions and circumstances. With this construction it is necessary that the magnets should receive an impulse 'from the master-clock every halfminute, as before described.

IVe claiml. In an electric clock, a switch connected to and operated by rocking armatures, which switch consists of a lever pivcted at one end, a bar connected to the rocking armatures and operating transversely of the free end of said lever, a pin fixed in the end of said bar and operating in the slot in the free end of said lever, a lug attached to the free end of said lever, a pin transversely fixed te said lug, contact-points upon the opposite ends of said pin, springs xed to the base of the machine by pests, the free ends of said springs being` positioned adjacent said contact-points, setscrews for adjusting the free ends of said springs, and suitable electrical connections, substantially as specified.

2. In an electric clock, a switch connected to and operated by rocking armatures, which switch consists of a lever pivoted at one end, a bar connected to the rocking armatures and operating transversely of the free end of said lever, said bar consisting of two pieces of metal connected together by a piece of insula` tion, a pin 'fixed in the end of said bar and operating in the slot in the free end of said lever, a lug attached to the free end of said lever, a pin transversely iXed to said lug, contact-points upon opposite ends of said pin, springs fixed to the oase-of the machine by posts, the free ends of said springs being positionednadjaeent to said contact-points, setscrews for adjusting the free ends of said springs, the nut and spring washer for regu lating the pressure upon the pivoted end of said lever, and suitable electrical connections, `substantially as specified.

In an electric clock, the combination,with rocking armatures, of a switch consisting of the bar 27 attached to the rocking armatures, said bar consisting of two metallic ends joined together by insulation 27h and the rear end of said bar having a sliding connection with the base, the pin 2S projecting upwardly from the rear end of said bar 27, the switch-lever 30 pivotally mounted upon the base and having the slot 29 in its free end in which said pin 23 operates, the upwardly-projecting lug 37 upon the free end of said switch-lever 30, the contact-pin 38 attached to said lug and the

springs

43 and 44 adj ustably held in position to be engaged by said contact-pin, substantially as specified.

4. In an electric clock, a switch to be operated by rocking armatures, consisting of the switch-lever 30, the plate 3l under one end of said switch-lever, the pin 32 passing downwardly through the end of said switch-lever and through said plate and lixed inthe base, a collar 33 upon said pinand engaging the upper surface of said switch-lever,the washer 34 on top of said collar, the spring-washer 35 on top of said washer 34, the nut 3G on top of said spring-washer, the upwardly-projecting lug 37 upon the free end of said switchlever, the contact-pin 3S attached to said lug, the platinum contact-points 39 and 40 upon the ends of said pin, the'springs 43 and 44 ad justably held in position to be engaged by IOO IIO

said contact-points, and means ot operating the free end of said switch-lever, substantially as specified.

5, In an electric clock, a switch to be operated by rocking armatures, consisting ot the switch-lever SO, the plate 3l under one end of said switch-lever, the pin 32 passing downwardly through the end of said switch-lever and through said plate and fixed in the base, the collar 355 upon said pin and engaging the upper surface of said switch-lever, the washer St on top of said collar, the spring-washer 35 on top of said washer S4, the nut 36 on top of said spring-washer, the upwardly-projecting lng 37 upon the tree end of said switchlever, the contact-pin 3S attached to said lug, the platinum contact-points S9 and t0 upon the ends of said pin, the springs t3 and tet adjustably held in position to be engaged by said contact-points, means ot operating the tree end ot said switch-lever, which means consist ot a bar 27 attached to rocking armatures and having a sliding connection with the base, the pin 2S projecting upwardly from the rear end et said bar through the slot 29 in the free end et said switch-lever 30, and insulation between the two ends of said bar 27, substantially as specified.

G. In an electric clock, a switch operated by rocking armatures, consisting of the bindingposts tl and t2 fixed tothe base, the contactsprings 43 and et fixed to said binding-posts substantially in parallel position, the posts '-land t() positioned between the free ends ot said springs, the set-screws t7 and iS screwseatcd respectively in said posts 45 and tti with the points of said screws against the inuerfaces ot the tree ends of said springs, the switch-lever 230 pivoted with its free end between the tree enus ot said springs, the lug' 3T attached to the free end of said switch-lever, the contact-pin 3S attached to said lug, the ends ot said contact-pin beingin position to engage the free ends of said springs, and means of operating said switch-lever, substantially as specified.

7. In an electric clock, a pair of electromagnets mounted one above the other, armatures in position to engage the cores of said magnets, a rocking' connection between said armatures, a switch attached to and operated by said armatures for the purpose ot alternating the current between said magnets, which switch consists of a pivotally-mounted lever having a slot in its free end, a bareonnected to the rocking armatures and having a pin in its tree end to engage said slot,a contact-pin mounted upon the free end et said switch-lever, and leaf-springs mounted in position to be alternately engaged by said contact-pin, substantially as specified.

8. In an electric clock, a pair ot electromagnets mounted one above the other, armatures in position to engage the cores ot' said magnets, a rocking connection between said armatures, a switch attached to and operated by said armatures for the purpose of alternating the current between said magnets, which switch consists of a pivotally-mounted lever having a slot in its iree end, a bar connected to the rocking armatures and having a pin in its free end to engage said slot, a contactpin mounted upon the free end of said switchlever, and leaf-springs mounted in position to be alternately engaged by said contact-pin, one ot said leaf-springs being electrically eenneeted to the upper magnet and the other one of said leaf-springs being electrically connected to the lower magnet and said switch-lever bei n g electrically connected with the battery, and set-screws lfor adjusting the tree ends ot said springs relative to said contact-pin in such a way that but one spring will be in Contact with the pin at a time, substantially as specified.

f). In an electric clock, the electronmgnets I2 and 13, the brackets It and l5 in front ot said magnets, the shaft 1G journaled in the upper ends of said brackets, the vertical bars I7 and IS attached to said shaft, the armature 19 connecting the upper ends of said vertical bars, the armature O connecting the lower ends ot said vertical bars, the switchbar 27 attached to one ot said armatures and the switch-lever 30 connected to said bar, substantially as specified.

IO. In an electric clock, a pair et electromagnets mounted one above the other, armatures in position to engage the cores of said magnets, a rocking connection between said armatures, reciprocating pawls operated by said armatures in opposite directions, a worm mounted in front ot' said armature, a ratchetwheel upon the shaft of said worm and in position to be rotated by said pawls, and a switch attached to said armatures whereby the current is alternated between said magnets, which switch consists of a lever pivoted at one end, a bar connected to the rocking armatures and operating transversely ot the free end ot said lever, said bar consisting et two pieces ot` metal connected together by a piece ot insulation, a pin fixed in the end ot said bar and operating in the slot in the tree end ot said lever, a lug attached to the tree end of said lever, a pin transversely Yfixed to said lug, contact-points upon opposite ends of said pin, springs fixed to the base of the machine by posts, the tree ends ot said springs being positioned adjacent to said contact-points, set-screws for adjusting the tree ends of said springs, and the nutand springwasher for regulating the pressure upon the pivoted end of said lever, substantially as specified.

Il. In an electric clock, a pair of electromagnets mounted one above the other, armatures in position to engage the cores ot said magnets, a rocking connection between said armatures, reciprocating pawls operated by said armatures in opposite directions, a worm mounted in 'trent of said armature, a ratchetwheel upon the shaft ot said worm and in position to be rotated by said pawls, a switch ICO IIO

attached to said armatures whereby the current is alternated between said magnets, and connections between said worm and the hands of a clock whereby said hands are operated by the operation of said armatures, which connection consists of the bracket SO having the vertically-alined bearings 8l and S2, the shaft 823 mounted in said bearings, the collar Si fixed io said shaft below the bearing S2, the collar S5 loosely mounted upon said shaft immediately below the collar 84, the bevelgear '79 fixed to the lower end of said collar S5, the disk SG fixed to the upper end of said collar S5, said disk having evenly-spaced recesses in its periphery, the arm 87 projecting horizontally from the collar 8st., the pin SS in the outer end of said arm and in position to engage the said recesses, means of operating said bevel-gear 79 and connections between said shaft S3 and the hands of the clock, substantially as specilied.

l2. In an electric clock, a pair of electromagnets mounted one above the other, armatures in position to engage the cores of said magnets, a rocking connection between said armatures, reciprocating pawls operated by said armatures in opposite directions, a worm mounted in front of said armature, a ratchetwheel upon the shaft of said worm and in position to be rotated by said pawls, aswitch attached to said armatures whereby the current is alternated between said magnets, a disk mounted upon the shaft of said worm, said disk having a notch in its periphery, a dog pivotally connected to the face of said disk and positioned with its free end to operate adjacent to said notch, a pin projecting from said free end, an armature vertically positioned with its free end adjacent to the periphery of said disk, a tooth upon said armature and in position to engage the notch in said disk, a pawl pivot-ally attached to said armature with its free end in position to engage said pin upon said dog, substantially as specified.

13. In an electric clock, a pair of electromagncts mounted one above the other, armatures in position to engage the cores of said i'nagnets, a rocking connection between said armatures, recijiirocating pawls operated by said armatures in opposite directions, a worm mounted in front of said armature, a ratchetwheel upon the shaft of said worm and in position to be rotated by said pawls, a switch attached to said armatures whereby the current is alternated between said magnets, a disk mounted upon the shaftof said worm, said disk having a notch in its periphery, a dog pivotally connected to the face of said disk and positioned with its free end to operate adjacent to said notch, a pin projecting from said free end, an armature vertically positioned with its free end adjacent to the periphery of said disk, a tooth upon said armature and in position to engage the notch in said disk, a pawl pivotally attached to said armature with its free end in position to engage said pin upon said dog, and connections between said worm and the hands of a clock whereby said hands are operated by the operation of said armatures, substantially as specified.

lli. In an electric clock, reciprocating pawls attached to rocking armatures, a ratchetwheel mounted upon a shaft in a position to be rotated by said reciprocating pawls, a worm mounted upon the shaft of said ratchet-wheel, a disk mounted upon said shaft and adjacent said ratchet-wheel, said disk having a notch in its periphery, a dog pivotally connected to the face of said disk and positioned with its i'ree end to operate adjacent to said notch, a pin projecting 'from said free end, an armature vertically positioned with its free end adjacent to the periphery of said disk, a tooth upon said armature and in position to engage said notch in said disk, a pawl pivotally attached to said armature with its free end in position to engage said pin, a pin projecting from the free end of said vertical armature, a block of insulation upon the outer end of said pin, a binding-post, a leaf-spring attached to said binding-post with its free end in engagement with said block of insulation and a contact-point in position to be engaged by the free end of said spring when said spring is operated by the attraction of said armature, substantially as specified.

15. In an electric clock, a contact-point carried by the shaft of a master-clock, a spring in position to be engaged by said contact-point at each revolution of said shaft, a block of rubber attached to the front plate of the masterclock, adjustable connections between said block of rubber and said spring, whereby said spring is supported and may be adjusted, a vertically-positioned electroniagnet connected by suitable conductors to said spring, a vertical armature operated by said magnet, a pin carried by the free end of said armature, a block of insulation upon the free end of said pin, a leaf-spring engaging said insulation, a contact-point adjacent the free end of said spring and in position to be engaged by said spring when said spring is operated by the attraction of said armature, and conductors attached to said contact-point and to said spring, substantially as specified.

1G. In an elect-ric clock, an adj nstable connection between the motive power and the hands of a clock, which connection consists of the bracket 8O having the vertically-

alined bearings

81 and 82, the shaft 83 mounted in said bearings, the collar 8a fixed to said shaft below the bearing 82, the collar 85 loosely mounted upon said shaft immediately below the collar 8i, the bevel-gear 79 iiXed to the lower end of said collar 85, the disk 86 Xed to the upper end of said collar 85, said disk having evenly-spaced recesses in its periphery, the arm S7 projecting horizontally from the collar 84, the pin 88 in the outer end of said arm and in position to engage the said recesses, means of operating said bevel-gear ICO IIO

70 and Connections between snid shaft S3 and the hands of the elook, Substantially as speeified.

17. In un electric eloek, the bloei; of rubber 0U adjust-ablyattached to the front plate oIi :L master-clock, the bar 101 attached to the outer end of said block, the screw 102 in the lower end of said bnr, the

lugs

103 and 101 at the upper end of said bnr, the nut 105 mounted between said lugs, the screw 100 positioned horizontally through said lugs and Said nut, the leaf-spring 107 attached to one end of said screw and resting upon the upper surface of said bloek, the lug 108 projecting` upwardly to :t point over the said spring` 107, the set-