US616417A - hackmann - Google Patents

Description

In. 6|6,4|7. Patented Dec. 20, |898. F. HACKMANN. INDICATOR.

(Applicm'on med Nov. n, 1697.) (No Model.) 3 Sheets-*Sheet l.

NU. 6l6,4|7. Patented 000.20, |898. f F. HACKMANN.

INDICATOR.

(Appumion med mw. 2e, 1897.)

(No Model.) 3 Sheets-Sheet 3.

Z4 2 1 W f @JW/, I// ff da f2 ya 918739863138 90 S'MSA',

UNITED STATES PATENT OFFICE.

FREDERICK IIACKMANN, OF'MILNAUKEE, IISCCNSIBQ ASSIGNOR,B'Y

DIRECT AND MESNE ASSIGNMENTS, TO THE AUTOMATIC INDICATOR- COMPANY, CF SAME PLACE,

iNDicAToR.

SPECIFICATION forming part of Letters Patent No. 61B,417, dated 'December 20, 1898. Application iiled November 26, 1897. Serial No. 659,786. (No modelJ T0 tl/ZZ whom 'it 72mg/ concern:

Beit known that I, FREDERICK IIACKMANN, of Milwaukee, in the county of Milwaukee and State 0f Wisconsin, have invented a new and useful Improvement in Indicators, of which the following is a description, reference being had to the accompanying drawings, which are -a;part of this specification.

in contradistinction to marle's or dashes priuted on a movable slip of paper, as is now done in the most common form of lire-alarm indicators. if

A further object resides inthe provision of a construction which in tl'iej'case of a .firealarm apparat-us, for instance is applicable t0 any existing system in which alarm-boxes are provided in connection iwith a make-andbreak electrical circuit.

Furthermore, my invention contemplates as objects sim plicity and chcapness of construction.

With the above and other incidental objects in view the invention consists of the devices and parts or their equivalents, as hereinafter more fully set forth.

In lthe accompanying drawings, Figure 1 a side elevation with the pumpand other parts in section. Fig. 2 is a platz view of the comn plete machine. Fig. 3 is a Ke'tion ou theline 3 3 of Fig. 2. Fig. 4 is a section on the line 4 i of Fig. 1, and Fig. 5 is a section through the printing-roller. y

Referring to the drawings, the numeral (i indicates a base-plate provided at one end with binding-posts 7, to which are connected, respectively, the supply and return wires. (Not shown.) x

Mounted upon the hase-board is a metallic frame consisting of a base 8,' provided at one end with an upwardlyfextending member 9,

preferably of arch-shaped form. The base S 5o is secured to the base-board by being screwed or otherwise suitably connected thereto.v4 g

Supported on the base 8 is an electromagnet y 10. From the binding-posts 7 extend wires 11 and 12, leading to the respective coils of 55 the electromagnet. lhe armature 13 of the;

electromagnet is secured medially to a medial point of a pivoted lever 1l. Near one end this lever has projecting laterally therefrom the pintles 15. 'lhe ends of these pintles 6o are pointed and turn in. recesses formed in the ends of adjusting-screws 16, said screws passi/ng through rthreaded openings lin the side arms of the upwardly-extending archshaped portion U of the base 8. These screws 65 are provided at their outer ends with milled heads 17 for convenience in turning the same. 'lhe screws also carry jam-nuts 18, which are adapted to be turned against the side arms of the areh-shaped portion 9, so as to hold `7o the screws in adjusted position. Whenever it is desired to turn the screws for the pur-y poseof adjustingthe bearings, the jam-nuts,

of course, are loosened. It is obvious that the farther inward the adj listing-screws are 75 turned the greaterwill be the power required to turn the lever on its pivot, and when the Screws are turned outwardly the lever will turn more freely or with less power. The lever has depending from its pivotal end a rod 8o lt,the lower end of which is engaged by one. end of a coiled spring 20.v 'lo the opposite end of this coiled springr is connected aser-ew 2l. This screw passes through a plain or uuthreaded opening in a post or upright`22 and 85 is provided for a desired 'distance longitudinally with a groove 23. A pin 2t extendsinwai-di y from the post and enters this groove. By this arrangement the screw is prevented from rotating. Nuts 25 25' engage the screw 9o on opposite sides of the post. The nut Lis adapted to be turned so as to cause a ,longitudinal movement of the screw," and the nut 25' is adapted to be turned against the post when the desired adjustment of the screw is 95 obtained, thereby acting as a jam-nut and in connection with the nut 235 holding the screw against longitudinal movement after proper adjustment of the same. By adjusting the screw 2l,it is obvious that the tension of the spring 2O may be regulated, the function of said spring being to return the lever an adjusting device, whereby the limit of thedown movement of the lever is regulated, the lower end of the screw being adapted to contact with the lower member ofthe curved arm 26. A jam-uut 2 9 is adapted to turn on the screw above the lever, and this jam-nut by being turned against the lever serves to hold the screw to adjusted position. The extent of the upward movement of the lever is regulated by means of a similar screw 30, which turns in a threaded opening formed in the upper member of the curved arm 26, and with the end of which screw the upper side of the end of the lever is adapted to contact on the up movement of said end of the lever. Thisscrew is also provided with a milled head 3l for convenience in turning the same and carries thereon a jam-nut 32, adapted to be turned against the upper side of the upper member of the curved arm 2li-in order to hold thescrew to adjusted position.

Extending outwardly from one side of a supplemental framework 33 is a pivot-pin 34. On this,pin isv mounted a rocking lever 35. One end of this rocking leveris provided with an elongated slot 36, into which is adapted to extend a projecting pin 37 from the end of the lever 14. Mounted in the side pieces of the supplemental frame isa shaft 38, which shaft has mounted fast thereon between the side pieces of the supplemental frame a feedroller 39. The shaft 3s has also mounted fast thereon adjacent to one end of the feed-roller 39 a cog-wheel 40. `One of the ends of the shaft 38, which projects beyond the side of the supplemental frame,has mounted thereon a ratchet-wheel 4l. Pivoted at a medial point to the angularly-benteud 42 of one arm of the rocking lever 35 isa pawl 43. The upper end of this pawl engages the ratchettvheel, and to the lower end of the pawl is connected one end of the coiled spring 44. The opposite end of this coiled spring is connected to a projecting arm 45; From this construction it will he seen that as the end of the lever 14 is forced downwardly it will throw the ehd of the rocking lever 35, to which The upper end of this screw is I ratchet-Wheel will thereby be turned the distance of one tooth, and will consequently rotate the shaft 38 and the drum and cog-wheel mounted upon said shaft. The cog-Wheel is held against backward rotation by means of a spring-dog 46, secured at its lower end to the base and having its upper end engaging the teeth of the ratchet-wheel.

Mounted in elongated bearings 47, formed at the upper ends of extensions from the slipplemental frame 33, is a shaft 48, the ends of this shaft being squared to prevent said shaft from turning in its bearings. On this shaft is mounted a printingwheel 49 and also loosely a cog-wheel 50 adjacent and fast to one side of the printing-wheel. l This wheel is shown in the :accompanying illustration of my invention as provided peripherally with a series of num bers,which are in the present exem plifiralion of lnyinvention designed to run from l to 9. The numbers, if desired, may be formed upon a peripheral'band 5l, of rubber or other suitable yielding material, as clearly shown in Fig. 5. lt will also be seen from Fig. 5 that the wheel is' chambered or hollow, and'in t his cham bered or hollowed-out portion isarrangedaclock-springZ. One end of this spring is secured to the shaft 48and the otherend to the-.inside of t he wheel. When the Wheel is turned in one direction, it is obvious that the spring is wound up tightly on the shaft, and the moment the wheel is released after being turned in such diret-tion the unwinding of the spring returns the wheel to its normal position. wheel is such that. the number l is in position to make the first imprint, and said position is always secured by means of a pin 53, which enters a recess 54 in the printit1g-\vheel, as clearly shown in Fig. 4. The end ofthe pin wit-'hin this recess is formed with an enlargement or head 55, and between this.head and theinner wall of the' recess -lis conlined a coiled spring 56, which spring exerts a pres- IIO sure outwardly on the piti and normally holds said piti outwardly, so as lo contact with a part of the framework, and constitutes said pin a stop for regulating the extent to which the printing-wheel is rotated ,backward,'or, in other words, after the spring 52 has lmcoiled to permit. the printing-wheel to rotate .backward only so far as to bring the number l again in position to make the lirst imprint. It will be understood that even at this point there is some tension on the spring 52, as it is not fully unwound. is desired to still further increase the tension of the printing-wheel 49, the pin 53 can be pushed inwardly by the finger or otherwise against the action of the coiled spring 56, so as to ext-end far enough into the recess 54 ns to clear the framework. lhe wheel can then be given an additional tn rn or turns, whereby it is obvious that the tension' of spring 52'is increased.

The numeral 57 indicates a y oke which has extending from one end thereof an arm 58.

If at any limeit y which receive the ends of the shaft 4S.'

The end of this arm is formed with an eye 5S), in which is fast a pin 60. The ends of this pin are pointed and fit in recesses formed in the ends of screws (51 G1, said screws being provided upon their outer ends with milled heads 62 for convenience in turning the same. The screws-pass through threaded openings in an angular bracket 63, and adapted to turn upon the screws are jam-nuts 54, which may be made to bear Iirmly against' the adjacent portions of the bracket, and thereby hold the screws firm to adjusted position. By providing these adjustable bearing-screws the yoke 51 may be. made to turn with more or less freedom, as desired. 'lhe side hars of the yoke 57 are provided with elongated slot-s G5, One of these side members is extended, as indicated at 66, and the extremity of this extension is formed with an elongated slot (37, which is adapted to receive the pin 37, projecting from the end ofthe lever 14.

Extending up from the base 8 is a post 68, which may be formed or provided with a U- shaped portion G9, and extending up from this U-shaped portion is a bifurcated arm 70, the fnl-cate parts of which are formed at their upper ends with bearings 71. Mounted in these bearings is a shaft 72, which shaft carries an inking-roller 73, which roller cont-acts with the periphery of the printingwheel 49, so as to continnallysnpply ink to the type or numbers on said printing-wheel. Mounted in bearings just in advance of the feed-roller 39 is another grooved roller 74, which grooved roller is in close proximity to the periphery of the feed-roller. board 6 are secured uprights 75, the upper ends of said uprights being provided with openings which form bearings for the journals of a roller 76. This roller has radiating from opposite ends thereof the arms 77.

The numeral 78 indicates the strip of paper upon which the imprint of the printingwheel is to be made, said paper being wound upon the roller 76, as clearly shown in Fig. 1, and being confined between the radiating arms 77. The strip is then extended over the feedroller 39, thence between said feed-roller and the grooved roller 74, as clearly shown. The grooved roller therefore serves to keep the stripof paper in engagement with the periphery of the feed-roller.

Secured to an arm 79, extending from the supplemental frame 33, is the cylinder of an air-pump 80. This cylinderis provided in its bottom with a valve-opening 8l, which is controlled by means of a loose ball-valve 8:2.v

Within the cylinder works a piston 83, and pivotally cpnnected to this piston is the lower end of a stem Si. This stem passes through an opening in a screw-cap adjusted to the upper end of the cjlinder, and the upper end of the stem has pivotally connected thereto a `rocking lever 85. The inner` end ofthis rocking lever is pivotally connected to a yoke 36, the downwardly-extending arms ofk said Near one end of the base? yokestraddling the printing-wheel 49 and being bent into hook form to engage under the ends of the shaft 48 of said printingwheel. The pivot of this rocking lever consists of a transverse in 87 the ends of which pin are received in recesses formed in the ends of screws 88, said screws passing through threaded openings in opposite portions of an angle-arm S9, secured to and extending upwardly from the supplemental frame 33. These screws are also provided on their outer ends with milled heads 90 for convenience in turning the same, and have also turning thereon jam-nuts 91, which serve to hold the screws firmly to adjusted position.

The above being a description of the parts of my invention, its operation will now be p explained. For instance, if itis supposed that it is used in connection and in circuit with an electrical fire-alarm system the indicator is located at a suitable point where itis desired the alarm should be 1ecorded-as, for rinstaneeLat a police-station. If now an alarm' is turned at any particular box by aperson properly manipulating the turn-in lever of the box, so as to produce a make-and-break current, the electricity passing over the linewire will be conducted to either of the binding-posts 7, and from thence by either of'the wires 11 or 12 (in accordance with which wire is the supply-wire) to the electromagnet. As this magnet is energized the Aarmature is drawn toward and to the cores of the magnet. to the lever 14, of course said lever is caused to turn on its pivot, causing the opposite end thereof to descend. NVith this descent of the end of the lever 14 the rocking lever 35 is turned on its pivot, so as to move the dog 43 to a point to engage the next tooth of the ratchet-wheel 41. At. the same time the extended arm G6 of the yoke 57 is brought downwardly, so as to cause the printing-wheel to descend and at the same time the teeth of the cog-wheel 50 to-engnge the teeth of the cog-wheel 40. The descent of the printingwheel causes the imprint of the uutnber1, on the strip ot' paper '78,which paper passes between said printing-wheel and the feed-wheel 39. With thc down movement of the printing-wheel also the yoke 86 is pulled downward ly, and this causes a turningoi the rocking lever and a consequent uplifting of the piston-stern 84 and its piston 83 and lat the same time a raisingot' the valve 82 to permit air to enter the cylinder 8L). At this time the current is broken, vand the moment this 0ccurs the armature 13 is no longer attracted to the elevtromagnet, and consequently the le- Aver 14 is free to return toits normal position.

'lhis has the effect at the same time of rocking the lever 35, seas to return to its normal position, and causing the dogcarried thereby to rotate the ratchet-wheel 4l the distance of one tooth.l As the cog-wheel 4U is carried on the same shaft with the ratchet-wheel 41, said coc-wheel 40 is also therebv rotated. and the IOO IIO

roller 39, which is likewise mounted on the same shaft with the cog-wheel 40 and ratchetfed forwardly a suiiicient distance to present a clear space for the imprint of the next number.` With the uplifting of the armature the yoke 57 is also free to turn back to its normal position. This turning back of said yoke is just suiiicient toraise the printing-roller clear of the feed-roller, so as to allow-for the passage or forward movement of the strip of paper. It is notraised, however, by said yoke suiciently high to clearthe teeth of the cog-wheel 50 from the teeth of the cog-wheel i0. When, however, there is a period of rest between the makes and breaks, the cog-wheel 50 is raised suiciently high to-clear the'y tefeth of the cogwheel 40 by reason of the-uplifting of the yoke 8G, the arms of vwhichengage the shaft 48 and are moved upwardly| the moment the yoke 57 has been turned, asfhereinbefore described. It will be noticed that the slots in the arms of the yoke 57 are somewhat wider than the diameter ot the shaft 48, so that after the yoke 57 has completed its full movement the yoke 86 is still permitted to move upwardly far enough to biting the shaft 48 into contact with the upper edges of the slots 65, and this distance is suliieiqnt to clear the teeth of the cog-wheel 50 from the teeth of the cog-wheel 4.0. The yoki'eBU is caused to move upwardly gradually by the rocking lever and the connection between said rocking lever and the piston 831`of the air-pump. As said rocking-lever S5 is thrned on its pivot the piston is caused to slowly descend, being resisted by the air beneath the same, which is permitted to escape slollwly through the -valve-opening of the cylinder, owing to the loose fit of the ball-valve 82.2v By the time the piston 83 has made its full descent the cog-wheel 50 is raised to its highest extent, which is, as before stated, to such a point as to clear the teeth of the resp tive cog-wheels. The moment thisclearance ,occurs the coiled spring 52 within'theprintingwheel causes a reverse rotation of said printing-wheel to such an extentas to again bring thenumber l on the under side of the printing-wheel to such position as to make the next succeeding imprint, it being understoo'd that this reverse rotation of the printing-wheel is limited by the stop-pin 53. ,5

In the use of my invention/in a lire-alarm system it will be supposed that an alarm is turned in from box 23. The momentthe current is made or completed to the indicator and the printing of the number l is caused on the strip of paper the current is then again broken and quickly completed again before the teeth of the cog- wheels 50 and 40 have had a chance to disengage and causing the printing of the number 2. After the number 2 is struck there is then a period of rest in the make-and-break current, which allows suiicient time for the printing-wheel to ascend far enough to disengage the teeth of the cogs 50 and i0. The moment this disengagement takes place the coiled spring 52 unwinds and returns the printing-wheel to a position in which the number l is again on the under side of the roller directly above the strip of paper and in line to make an imprint. The period of cessation of the make and break is followed by three rapid make-and-break currents, which respectively cause the printing of the numbers 1, ,2, and 3, and the printing of this last number 3 is followed by another period of rest, which allows of the disengagement of the teeth of the two cog-wheels and the return of the printingwheel to its normal position. 'lhe alarm is read by reading the last figure after l as often as the number l7 occurs. For instance, on the strip of paper shown in Fig. 2.

the numbers l i 1 2 3 are shown. The last figure following the first l is 2,and the last figure following the second l is 3, thus indicating that the alarm is 23. This system of reading the alarm is true with respect to any alarm which may be turned in.

While-I have described certain detailsof 'construction in the foregoing description, yet

l do not wish to be understood as limiting myself to the specific construction of many of the parts hereinbefore described, inasmuch as many of such' parts may be changed or modified withoutmaterially departing from the spirit and scope of myinvention. l also do not wish to be understood as restricting myself to a printing-wheel having numbers or digits on the periphery thereof, inasmuch as any other suitable characters may be employed to suit the purposes to which the indicator is applied.

What l claim as my invention is-- 1. In an electrical indicator, thecombination, of an electrical circuit, a lever adapted to be turned from its normal position on each completion of the circuit, a printing-wheel,

IOO

ric

means for feeding paper, or other suitable material to be printed upon, toy the wheel, mechanism between the printing-wheel and the lever, said mechanism adapted, as the 1ever is turned from its normal positiomto cause the printing-wheel to contact with and make an imprint upon the strip of paper, or other suitable material, and on the breaking of the current to cause the printing-wheel to revolve, and the feeding mechanism to feed the paper forward, the revolving of the printing-wheel causing the next succeeding numberor character thereon to be brought and held in place, when followed by a subsequent instant com- ,pivotally connected to the other end of the pletion of the current, and mechanism adapted, during a cessation of the electrical makes and breaks, to cause the printing-wheel to return to its normal position for printing its initial number or character.

2. In an electrical indicator, the colnbination, of an electrical circuit, a lever adapted to be turned from its normal position on each completion of the circuit, a printing-wheel, a feed-wheel adjacent thereto, mechanism between the wheels and the lever, said mechanism adapted as the lever is turned from its normal position to cause the printing-wheel to contact with and make an imprint on a strip of suitable material between the wheels, and on the breaking of the current to cause the printing-wheel to move out of eontaetwith the feeding-wheel, and the two wheels to revolve, and the paper thereby fed forward, the revolving of the printing-wheel causing the next snceecdin g num ber or character thereon to be brought and held in place when followed bya subsequentinstant completion of the current, and mechanism adapted, during a cessation of the electrical makes and breaks, to cause the printing-wheel to return to its normal position for printing its initial number or character.

3. In an electrical indicator, the combination` of an electrical circuit, an electromagnet within the circuit, an armature for the electromagnet, a pivoted lever "secured to saldarmature, aprinting-wheel, a feed-wheel adjacent thereto, mechanism between the wheels and the lever, said mechanism adapted, as the lever. is turned from its normal position by the completion of the current, to cause the printing-wheel to engage the feed-wheel and make an impression on a strip of suitable material passed between the wheels, and onl the breaking of the current to throw the printingwheel out of engagement with the feedingwheel and to also cause the two wheels to revolve and the stri p of material to be fed forward, the revolving of the printing-wheel causing the next succeeding numberor character thereon to be brought into position for printing, and to hold the wheel at such position whenever the first make and break is followed by a subsequent-instant completion of the current, and mechanism adaptedduring a cessation of the electrical. makes and breaks to cause thc printing-wheel to return to its normal position for printingits initial number or character.

et. In an indicator, the combination, of an operating-lever, means for turning said lever from its normal position, a shaft, a feed-wheel mounted on saidl shaft, a cog-wheel and a ratchet-wheel also mounted on said shaft,

another shaft mounted movably in bearings, l

aprinting-wheel and a cog-wheel mounted on the latter shaft, a rocking lever havingone end connected to the operating-lever, a dog rocking lever and adapted'to engage the teeth of the ratchet-wheel; and meehanismvbetween the end of the operating-lever and the prints ing-wheel, said mechanism adapted as the operating-lever is turned on its pivot in one direction to cause the printing-wheel to engage the surface of the feed-wheel and the two cog-wheels to mesh, and when operated in the'opposite direction adapted to throw the printing-wheel and the feed-wheel out of engagement and the two cog-wheels also ont of engagement.

5. In an indicator, the combination, of an operating-lever adapted to be turned from its normal position,ashaft,a feed-wheel mounted von said shaft, a cog-Wheel and a ratchet-wheel also mounted on said shaft, another shaft mounted movably in bearings, a printingwheel, and a cog-wheel also mounted on said shaft, a rocking lever having one end connected to the operating-leveiga dog pivotall)7 connected to vthe other end of the rocking lever and adapted to en gage the teeth of the ratchet-wheel, mechanism between the end of the operating-lever and the printing-wheel, said mechanism adapted as the operatinglever is turned in one direction to cause the printing-wheel to engage the surface of the feed-wheel and the two cog-wheels to mesh, and when operated in the opposite direction adapted to throw the printing-wheel and the feed-wheel out of engagement and also the two cog-wheels out of engagement, and meehanism adapted during aeessation of' the movements. of the operating-lever to cause the printing-wheel to return to its normal position.

6. In an indicator, the combination, of an operating-lever adapted to be turned from its normal position,a shaft,a feed-wheel mounted on said shaft, a cog-wheel and a ratchet-wheel also mounted on said shaft, another shaft mounted movably in bearings, a printingwheel and a cog-wheel also mounted. on said shaft, a rocking lever having one end connected to the operating-lever, a dog pivotally connected to the other end of the lever and adapted to engage the teeth of the ratchetwheel, and a pivoted yoke having its arms provided with elongated slots adapted to receive the ends of the shaft of the printing-A wheel, one end of said yoke being extended so as to engage the end of the operating-lever.

7. In an indicator, the combination, of an operating-lever, means for turnings id lever from its normal position, a shaft, a fe d-wheel mounted on said shaft7 a cog-wheel and a ratchet-wheel also mounted on said shaft, another shaft mounted movabl-.y7 in bearings, a printing-wheel and a cog-wheel moiinted on said shaft, a rocking lever having one end connected t0 the operating-lever, a dog pivotally connected to the .other end of thelever and adapted'to engage the teeth of the ratchetvwheel, a pivoted yoke having its arms provided with elongated slots'adapted to receive the ends of the shaft of the`printing-wheel, said slots being wider' than the diameter of the ends of the shaft, and oneof said arms being extended so as to engage the end of IOO IIO

the operating-lever, and a device also engaging th ends of the shaftot the printingwheel,` and adapted to pull said Wheel a greater distance away from the feed-wheel than said printing-wheelis pulled by theyoke, the latter augmented movement of the printing-wheel adapted to cause a disengagement of the teeth of the cogs.

8 in an indicator, the combination,v of an operating-lever, means for turning said lever from its normal position, ashaft, afeed-wheel mounted on said shaft, a cog-wheel and a ratchet-wheel also mounted on said shaft, another shaft movable in bearings, a printingwheel and a cog-wheel mounted on said shaft, a rocking lever having one end connected to the operating-lever, a dog pivotally connected to the other end of the lever and adapted to engage the teeth of the ratchet-wheel, a pivoted yoke having its arms provided with elongated slots adapted to receive the ends ofthe shaft of the printing-wheel, said slots being wider than the diameter ot the ends of the shaft, and one of said arms being extended so as to engage the end ot` the operating-lever. a yoke also engaging the ends of the shaft ot' the printing-wheel, a lever to .vhichsaid yoke is connected, and means for operating said lever. d, l

9. In an indicator, the combination, of an operating-lever, means for turning said lever from its normal position, a shaft, a feed-wheel mounted on said shaft, a cog-wheel and a ratchet-wheel also mounted on said shaft. an

i other shat't movable in bearings, a printing;-

wheel and a cog-wheel mounted on said shaft, a rocking,` lever having one end connected to the operating-lever, a dog pivotally connected to the other end of the lever and adapted to engage the teeth of the ratchet-wheel, a pivoted yoke having its arms provided with elongated slots adapted to receive the ends of the shaft of the printing-wheel, said slots being wider than the diameter of the ends of the shaft, and one of said arms of the yoke being,T extended so as to engage the end of the operating-lever, another yoke also engaging;l the ends of the shaft of the printing-wheel, a lever adapted as the lever to which said yoke is connected, and an airpump having the pistonestem `thereof connected to the end of the last-referred-to lever.

1G. In an indicator, the combination, of a printing-wheel, a shaft on which said wheel is mounted, a spring connected at one end to said shaft, and having,r its opposite end connected to the wheel, and a contact-pin extending laterally from a recess of the printing-wheel, and adapted when the wheel is turned .in a direction to Wind the spring to be pressed inwardly into the recess in order to clear a fixed point or stop of a framework.

l1. In an electrical indicator, the combination, of an electrical circuit, a lever adapted to be turned from its normal position on each completion of the circuit, a printing-wheel, a feed-wheel adjacent thereto, another wheel in advance of the teed-wheel, a roller, a strip of material wound on said roller and extended between the feed-wheel and the printingwheel and also between the feed-wheel and the rollerin advance of said feed-wheel, mech-- anism between the feed-wheel and the printing-wheel and the lever, saidmechanism is turned from its normal position to cause the printing-wheel to descend and make an imprint on the strip 'ot material passing,` between the wheel, and on the breaking of the current to cause the printing-wheel to ascend and the two wheels to revolve and the paper to be Jfed forward, the revolving of the printing-wheel causing,r the next succeeding number or character thereon to be brought and held in place whenever followed byan instant completion of the current, and mechanism adapted, during a cessation of the electrical makes and breaks, to cause the printing-wheel to return to its normal position to print the initial number or character on the strip ot material to be printed upon.

In testimony whereof I aiiix my signature in presence of two witnesses.

F REDERICK HACKMANN,

Vitnesses:

A. L. MoRsnLL, ANNA V. FAUsr.

Images