US758198A - Adding-machine. - Google Patents

Description

' PATENTED APR. 26, 1904.

T. A. WHEELER. ADDINGMAGHINE. APPLICATION FILED MAY 9, 1903.

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. PATENTED AP 26, 1904'. T. A. WHEELER. ADDING MACHINE. APPLIOATION IILED HAYS, 1903.

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PATENTED APR. 26, 1904.

T. A. WHEBLER. ADDING MACHINE.

APPLICATION FILED my 9. 1903.

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UNITED STATES Patented April 26, 1904.

PATENT OFFI E. I

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent 1V0. 758,198 dated April 26, 1904.

Application filed May 9, 1903. Serial No. 156,451. (No model.)

To all whom it may concern.-

Be it known that I, THEODORE A. WHEELER, a citizen of the United States of America, re-

. siding at the city of New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Adding-Machines, of which the following is a specification.

This invention contemplates the production of an improved adding-machine of simple and durable construction to be rapidly manipulated by persons not necessarily skilled by practice to mechanically add columns of figures in a manner to obtain absolute accuracy of result, and, further, the provision in a machine of this general character of simple and readily operated means for retracting the parts after operation whereby to reset the machine for subsequent additions.

Another object of the invention is the production of a very compact and readily-portable adding-machine which can be manufactured at acost sufliciently low to encourage its general usage, although certain features of the construction are possessed of advantages which render their employment in calculating-machines generally highly desirable.

The following description, read in connection with the accompanying drawings, will enable any one skilled in the art to which my invention relates to understand its nature and to practice it in the form in which I prefer to employ it; but it will be understood that my invention is not limited to the precise form and details of construction herein illustrated and described, as various modifications and changes may be made without exceeding the scope of the claims in which my invention is set out.

Referring to the accompanying drawings, Figure 1 represents in perspective an addingmachine embodying my invention, the front of the casing having an addition-index flanked by a slot, in which the key or motor bar is manipulated in operating the internal adding mechanism of a pair of wheels in opposite directions. Fig. 2 shows the internal adding mechanism in top view and the relation thereto of the key or motor bar and a cam-lifted bar 58 and its depressing-spring for rotating the wheel 16 backward. Fig. 3 is a vertical section taken on theline 3 3 of Fig. 2, showing the cam-actuated pivoted bar for operating the wheel 16 conjointly with the motor-bar for operating the wheel 15, the cam being shown in position to allow the bar to rest on the non-lifting part of the cam. Fig. 1 shows in Vertical section the fixed shaft on which the adding-wheels are mounted to rotate freely and the coasting parts rotatable on said shaft. Fig. 5 shows in sectional de tail the dog 68 on the pivoted bar 58, which operates to engage the teeth of the addingwheel 16 to efiect its rearward rotation in conjunction with the forward rotation of the wheel 15, which is actuated by the key or motor bar. Fig. 6 is a detail top view of the toothed cams for moving the free end of the bar 58 laterally for effecting the engagement of the dog 68 with the adding-wheel 16. Fig. 7 is a horizontal section taken on the line 4: 1 of Fig. 3. Fig. 8 is a horizontal section taken on the line 5 5 of Fig; 3, showing the dogs which release the lock of the adding-wheels. Fig. 9 shows in side view the parts mounted on the'right end of the shaft and the disk 89, havingthe pins 40 for engaging the shaft connected spring 35 to maintain the retracting tension of the spring. Fig. 10 shows the additionindex at the slot in which the key or motor bar is manipulated in the teeth of the addingwheel 15, and also showing the spring, which overlies the periphery of the wheel on the outer side of the teeth and at the outer side of the handle of the bar and by which the key or motor bar is maintained in engagement with the said wheel.

Referring to the drawings by numerals,1 denotes the casing, which may be of the rectangu larform shown and which has a bottom 2, sides 3 4., a back 5, a front 6, and an open top closed by a removable cover 7, hinged to the back 5 and having sides 8 8 and a covered top 9. In the front of the cover-top 9 is a vertical slot 10,

at which is a series of numbers from 0 to 10, inclusive, and 11 is a horizontal slot in said top, through which is displayed the numbers on the addition-wheels presently to be described and which will show the total of the addition. The cover is provided with fastening means 12 to secure it to the casing.

Erected from the base 2 are two posts 13 13, in the upper ends of which is fixed a shaft 14, on which are loosely mounted a combined units and tens wheel 15 and a combined hundreds and thousands wheel 16. Each wheel has a rim parallel with its axis and is provided at its periphery with numerals ranging from Oto 99, and the wheel 15 has a series of teeth 17 17 projecting laterally from the edge of the rim, theteeth corresponding in number to the number of numerals on the periphery, and said teeth are preferably so disposed as to bring the intervening spaces opposite to said numerals. The wheel 16 is provided with teeth 18 18,similarly located and disposed. Loose on the shaft is a hub or collar 20, fixed to the wheel 15 and having an annular groove 21, in which is rotatively confined the inner eircularly-bent end 22 of a motor or key bar 23, the free outer end of said motor or key bar being vertically movable in the slot 10 of the cover and terminating in a finger hold or button 24:. The key-bar is permitted a lateral movement limited by the right-hand wall of the slot 10 and by the base of the spaces between the teeth 17 of the wheel and also a vertical movement between the limits defined by the top of said slot 10 and the shaft-lineof the casing-front. Normally the wheels 15 and 16 are positioned to expose through the slot 11 the portions of their peripheries containing the ciphers, and in snch position the key or motor bar occupies the space between the teeth of wheel 15 at the bottom of the slot 10. 1n practice rotation of the wheel 15 to obtain the additions up to and including 99 is effected by disengaging the key-bar from the initial space at the bottom of the vertical slot by movement to the right, pushing with it the spring-arm, by elevating the key-bar to a point opposite the numeral on the fixed column by the slot to be added, by moving the key-bar to the left to cause engagement with the adjacent teeth 17, and, finally, by depressing the key-bar lever, and thereby rotating the wheel the desired extent, determined, as before stated, by the base of the slot 10, to display at the slot 11 the selected numeral. Accidental disengagement of the key-bar from a tooth 17 is prevented by a spring 25, attached at its lower end to the inner wall of the casing-front and extending parallel to the rim of the wheel 15, lying on its teeth outside of the bar to hold it between the teeth, and said springalso serves automatically to move the key-bar laterally to the left after elevation or depression into engagement with a teeth. In Figs. 1, 2, and 3 this spring is seen as a wire lying across and against the teeth between them and the inner wall of the casing, with its upper end free but held under the casing at the slot to keep it in place on the teeth, so that by pressing the bandle of the motor-bar to the right the spring will be moved out to allow the handle of the bar to be raised to engage the teeth at the desired point indicated by the numeral of the fixed column to be added, the slot being of a length to expose a teeth of the wheel for each numeral along the edge of the slot.

The wheel 15, as will presently be explained, is retracted to normal position by the action of a coiled spring, and said wheel is held against such retractive movement after each partial rotation by a spring-pawl 26, secured at one end to the adjacent post 55 and having its free end formed to engage the teeth 17 in one direction. After the operation of adding is completed to unlock the wheel and allow of its reverse rotation by the coiled spring there is employed an arm 27, pivoted at 28 and intermediately engaging an opening in a proection 29 on the spring-pawl 26. The forward end of the arm 27occupies a horizontal slot 30 in the casing front, said end projecting beyond the front, and in operation the arm is moved laterally to the left, and disengagement of the spring-pawl from the teeth 17 effects the release of the wheel 15 and allows of the rotation of the latter by the coiled spring.

The wheel 16, which is also retracted by the power of a coiled spring,'is held against reverse rotation after partial or complete forward rotation by a spring-pawl 31, fixed at its inner end to a plate 32 and engaging mediately of its length teeth 18. The pawl 31 is re tracted to'release the wheel by movement of an arm 38, which forms an extension of the pawl and occupies a slot 3 1 in the casing front.

The wheel 15 is rotated against the action of a spring 35, Fig. 4, coiled about the sleeve of the collar 36 and secured at its inner end to said sleeve, which is fixed by a set-screw 37 to the shaft, whereby, when desired, the tension of the spring is maintained. The coils of the spring are confined in a housing 38 through an opening in which the outer end of the spring extends adjacent to the outer face of a disk having face-pins. Fixed to the wheel 15 to move therewith, and hence loose in the shaft, is a disk 39, carrying a series, preferably four, of laterally-projecting pins 40 10, which are successively engaged by the outer end of the spring in the following manner: Inasmuch as a number of revolutions of the wheel would contract the spring-coils to such an extent as to give undue tension to the spring and great retractive force to the wheel 1 provide for a limited contraction of the coils, regardless of the extent of rotation of the wheel. The housing 38, while adjoining, is free from the disk 39; but in the movement of the wheel 15 said housing is partially rotated through the engagement of the end of the spring with one of the pins 40. Secured to the casin g side 4 is an arm 11, which has its outer end formed with an inclined shoulder 42, maintainedin the path of the end of the spring 35 by the contact with the rim of the disk 39 of an offset 43 on the arm. The extreme end of the spring after passing through the housing-opening is in engagement with one of the pins 40. Rotation of the wheel 15 carries with it the 'end of the spring, and when said end comes into engagement with the inclined shoulder 42 the latter disengages said spring end from the pin, and said end being free instantly retracts, carrying with it the housing until the next pin 40 is reached, when reengagement of the pin and spring-arm takes place. This retractive movement of the spring is insufiicient to cause undue expansion of the spring-coils. Consequently a suflicient tension is maintained to return the wheel tofirst position after release. The disk 39 is provided in its rim with a shoulder 46, Fig. 9, and 47 is a stop-arm extending from the front of the easing back into the path of the shoulder 46 to check the return. or rearward rotation of the wheel when the latter has reached its normal position. The return movement of the wheel 16 is similarly checked by a stop-arm48, engaging a shoulder 49 on a disk 50, fixed to and rotating with said wheel 51. Fig. 4 is a coiled spring fixed at its inner end to the collar 54 and fastened at its outer end to a pin 52 on the disk 50. The spring, which is incased in a housing 53, operates to retract the wheel 16 after rotation, and inasmuch as said wheel is limited in operation to a single rotation no meanssimilar to the spring-releasing means of the wheel 15 are necessary. 54 is the set collar or sleeve between the disk 50 and adjacent post 13, and to this collar the inner end of the spring 51 is fastened, and while joining the disk 50 is not fastened to it, and is therefore free to be set on the shaft to adjust the spring. At each complete revolution of the wheel 15 the wheel 16 is reversely rotated an extent equal to the distance between two of the numerals thereon, and consequently equal to the distance between two of the teeth 18. The means for locking the wheel after forward movement for releasing it for retracting it to first position and for checking its movement at said position have been fully set forth, and I will now describe the means for effecting its forward movement after a complete revolution of the wheel 15. Erected 4 from the base 2 is a post 55, Fig. 3, to the upper end of which is pivoted by a horizontal pin 56 a rod 57. The rod passes at its upperend through an opening in a bar 58, which extends approximately parallel with the wheel 15, and the function of this bar is to rotate the wheel 16 backward. The rod 57 forms a vertical pivot for the forward end of the bar, and as said rod is pivoted horizontally on the post '55 the bar is permitted to have at its rear end both a vertical and a horizontal movement. The elevation of the bar is against the action of -a coiled spring 59, and such vertical movement is obtained by a cam 60, Fig.3, carried by the hub 61, which is formed with hub of wheel 15 and rotatable with it. Lateral movement of the bar to the right, looking from the front, to, engage its dog with the teeth of the wheel 16 is effected through the engagement of a tappet or toothcam 62, Figs. 2, 6, and 7, carried by a disk 63, rotatable with the Wheel 15, with a tooth or shoulder 64 on the side of the bar 58, the meeting surfaces of the cam-tooth and toothshoulder being inclined, as seen in Fig. 6, whereas the opposite surfaces are abrupt or parallel with the axis of the shaft to insure a quick return lateral movement of the bar after disengagement of the cam and shoulder. Likewise the under side of the bar 58 and the cam 60 are formed to obtain a quick depression of the bar, the latter being recessed, as at 65, to receive the cam after it has passed the point shown at 66. The spring 59 in addition to retracting the bar after elevation also retracts said bar after movement to the left, looking from the front; but it is the fall of the bar down the incline which positively gives this retracting left movement to the bar to release its dog from the teeth. The rear end of this bar terminates in a right-angled extension 67, carrying a dog 68, which latter in the normal or lowest position ofthe bar is free of engagement with the wheel,

as in Figs. 2 and 3 and as seen in dotted lines in Fig. 5, the dog having been moved to such position by the dropping of the bar. In Fig. 5 the dog is shown in full lines as engaged between two teeth, and this is the position of the bar when raised and moved to the right, so that when it drops it will pull down the wheel with it and be moved to the left. For this purpose the relation of the cam-tappets and the bar-lifting cam are such that the movement of the dog to engage the.

teeth of the wheel will precede the falling movement of the bar to carry with it the wheel one point, and for this purpose the cam-tappets are arranged to effect such engagement before the lifting-cam allows the bar to fall and by its weight and the pulling down of its connected spring rotate the wheel.

In Fig. 3 the drop-bar 58 is shownin its lowest position by the tripping action of the lifting-cam 60, and in this position the bar will rest on the non-lifting part of the cam. The cam and the disk 63 being both fixed to and carried and ,moved together by the hub of the wheel 15, the relation of the liftingcam to the tappet-cam is such that while the bar is being lifted by the hub-cam the rotation of the disk with the wheel will carry the tappet-cam. up into engagement with the tap-' pet-cam 64 on the bar to move the dog of the latter into engagement with the teeth of the wheel 16, and these two cams are relatively fixed, so that the hub-cam will reach the notch or recess and allow the bar to fall, and quickly following the continued rotation of the wheel will cause the tappet-cams to pass each other, and in doing so the bar will be moved by the action of the spring 59 to the left to disengage its dog.

In operation, as the wheel 15 approaches a complete revolution the cam 60 engages the bar 58 and elevates it to bring the dog 68 opposite the next adjacent tooth 18, whereupon the cam 62 is brought into engagement with the shoulder 6 1 on the bar, with the result of moving the latter to the right to cause the dog to engage said tooth, as in Figs. 5 and 7. Immediately upon said engagement the highest point of the cam 60 trips past the point 66 on the bar, and a similar disengagement takes place at the shoulder or cam-tooth 6 1 and cam-tooth 62, with the result of releasing the bar and allowing the spring 59 to depress the bar while being retracted to the left to engage its dogs, as in Figs. 2 and 3. In the depression of the bar the wheel 16 is rotated by engagement with the dog a distance equal to a space between two of its peripheral numerals, consequently bringing a new numeral opposite to the slot 11. The provision for effecting the movement of bar 58 to the left consists of arm 69, extending from the side t of the casing, and terminates in a downward-inclined end 70 beneath and in the path of the drop-bar 58, and the purpose of the inclined end of this arm is to cause the bar as it is dropped from the cam 60 to slide down and toward the tooth edge of the wheel 15, and thereby carry the dog68 of the angled end of the drop-bar out of and away from the teeth of the wheel 16, and thereby leave the latter free to be returned to its normal position ready for the next addition. In this movement of the bar to disengage its dog from the teeth 18 it is limited by the toothed cams 62 and 6 1, abutting against their respective parts, the disk 63 and the side of the drop-bar 58, as shown in Fig. 6. The movement of the drop-bar to the right is limited by the engagement of the toothed earns 62 and 6 1, as seen in Fig. 7, which shows the point-s of the toothed cams resting upon each other, and thereby limits the movement-of the bar 58 to the right, and has engaged its dog with the teeth 18 of the wheel 16. The wheel 15 has a double function that is to say, its numerals indicate units and tens, and therefore does the work of a separate unit and a separate wheel of tenswhile the Wheel 16 also has two functions-that is to say, its numerals indicate hundreds and thousands, and therefore does the work of a separate hundred and a separate thousand wheel. The importance of the double functions of the adding-wheel is therefore seen to give compactness and a simple construction.

It is important to note that each toothed wheel is rotated by separate means, the one with a forward movement effected by the hand motor-bar and the other with a rearward movement effected by the drop-bar, the movement of which is rendered automatic so that the movement of one wheel controls that of the other and the rotation of both side by side inopposite directions is' 'portant to note that while the wheels rotate in opposite directions vertically side by side their numerals are exposed at the same opening with the result of the addition and that this exposure is effected with unerring ac curacy by the manipulation of the single motor-bar in its function of pulling down the wheel 15 from any one from 0 to .10 of the numerals of the fixed column and that such presentation of the result of the addition is unerringly determined by the bottom of the slot, as in Fig. 1, which limits the pulling down of the motor-bar, and therefore determines the extent of the downward movement of said Wheel. For every movement of the bar in traversing the fixed column of numerals it must always be limited in its descent by the bottom of the slot, and that limitation exactly brings the numerals on the wheel 15 to the sight-opening as each addition is made. It will also be seen that to whatever extent the wheel 15 is moved its teeth will stand in alinement with the teeth of the wheel 16 and that the numerals of the teeth of each wheel will be in alinement with each other and with the spaces between the teeth of each wheel, so that whatever numeral on the units-wheel 15 which may be presented to the slot 11 the movement of the dollar-wheel 16 will present its numerals in the same line at the slot. This relation of the teeth and numerals of the wheels is effected and maintained by the engagement of the spring-pawl 26 with the teeth of the wheel 15, and it will be understood that the engagement of the springpawls 26 and 31 will hold the wheels from turning against the retracting action of their respective coil-springs and 51; but the pawl 26 will allow the wheel 15 to be rotated forward, and the pawl 31 will allow the wheel 16 to be rotated backward, the downward movement of thewheel 15 being always limited by the stop formed by the bottom of the slot 10 to bring and to hold the teeth 17, so that the pawl will enter the space between the teeth at such stop, while the sleeve 61, upon which the cam-lifted bar 58 rests,will form a stop to limit the descent of said bar, and thereby move the wheel 16, so that the space between its teeth will receive the pawl 31 to lock said wheel.

I claim 1. In an adding-machine, a casing, a shaft fixed therein, a pair of adding wheels rotatively sleeved vertically adjacent to each other on said shaft, each having peripheral numerals and teeth corresponding to the numerals standing in alinement from the opposite edges of the wheels, a bar crossing the toothed side of the wheel pivoted at its front end and terminating at its free end in a dog at the toothed side of the wheel 16, means for supporting the free end of the bar, means operated by the rotation of the wheel 15 to impart to the free end of the bar a vertical and a lateral movement for engagement and disengagement of its dog with the teeth of the wheel 16 to pull the latter down at the rear, and a motor-bar on the sleeve of the wheel 15, adapted to engage the teeth thereof to pull'it down at the front.

2. In a calculating-machine, a casing having a vertical slot, a shaft, a wheel having peripheral numerals and teeth corresponding to the numerals, a motor-bar on said shaft having its handle end projecting through the slot and controlled in its movements .to engage and pull the wheel down the proper distance determined by the lower edge of said slot, a spring-arm at the slot along the teeth for 1 holding the bar in engagement, means for locking and means for releasing the wheel after each partial rotation.

3. In a calculating-machine, a spring-retracted rotatable wheel having a peripheral series of numerals and an annular series of.

teeth at said numerals, a collar on the shaft of said wheel, and a motor or key bar having an inner end engaging the collar and permitting vertical movement of the key-bar to rotate thewheel after engagement with a tooth, said key-bar being also laterally movable to permit such engagement.

1. In a calculating-machine, a casing having a vertical slot, a fixed column of numerals from O to 10, at said slot, a separate slot at the upper end of said fixed column of numerals, a shaft, a wheel thereon provided with peripheral numerals and teeth corresponding with the numerals, the relation of the'teeth to the vertical slot exposing one tooth for each numeral of the fixed column, a motor-bar on the shaft extending through said slot and adapted to engage the teeth, the relation of the two slotsbeing such that the bottom of the vertical slot will determine the movement of the wheel to expose the proper numeral on its periphery at the slot above the fixed column of numerals.

5. In an adding-machine, a casing, a shaft therein, a rotatable wheel sleeved thereon, a disk fixed on said sleeve and provided with a plurality of pins, a spring coiled on and having one end fixed to the shaft, the other end of the spring engaging one of said disk-pins, the winding of the spring by the rotation of the wheel causing its retraction, and means automatically to disengage the free end of the spring successively from one pin to another during the rotation of the wheel whereby the winding and expansion of the spring is ren- 'dered partial during a complete revolution of 'shaft projecting through the slot and adapted 'to have a movement therein laterally intoand out of engagement with the teeth and movable vertically in said slot to pull the wheel down, a stop to limitthe descent of the'bar, a spring 35 connecting the shaft and wheel-hub and against the action of which, the wheel is r0: tated, and means for locking and releasing the wheel after each pull-down of the motor-bar.

' 7. In a calculating-machine, a rotatable wheel having numerals, means for moving said wheel, a disk movable with the wheel and carrying a series of pins, a coiled spring fixed at its inner end and having its outer end adapted for successive engagement with said pins, and means effecting the disengagement of the spring end. I

8. In a calculating machine, a rotatable wheel having numerals, means for moving said wheel, a disk movable with the wheel, a coiled spring connected at one end with the disk, and a collar removably fixed to the wheel-shaft and to which the other end of the spring is attached.

9. In a calculating machine, a rotatable wheel having numerals means for moving said wheel, a disk rotatable with the wheel and provided with a shouldervand a series of pins, a stop-arm in the path of the shoulder, a coiled spring fixed at its inner end and adapted to engage the pins of said disk, and an arm having an inclinedshoulder extending into the path of the outer end of the spring to release it from the pin.

' 10. In an adding-machine, a casing, a shaft fixed therein, a pair of wheels 15 and 16 rotatively sleeved vertically side by side on said shaft, each having peripheral numerals and teeth corresponding to the numerals, standing from the outer side of the rims in opposite directions, a motor-bar on the wheel-sleeve engaging the teeth of the wheel 15 to pull it down at the front, a cam and a disk 63 both fixed on the sleeve, a pivoted bar. 58 atthe toothed side of said wheel 15, extending over the cam and terminating in a dog 68 adapted to engage the teeth at the rear of the-wheel 16, a tappet 62 on the disk and a tappct 64 on the bar for engagement to cooperate with the lifting function of the cam to move the dog to effect its engagement with the teeth of the wheel 16 to pull it down at the rear and a spring connected to said bar to force the dog out of engagement.

11. In an adding-machine, a casing, a shaft fixed therein, a pair of adding-wheels, rotatatively sleeved adjacent to each other on said shaft, the rim of each having peripheral numerals, and teeth corresponding to the numerals standing in alinement from the opposite rim edges, the numerals on each wheel also standing inalinement, a motor-bar on the shaft of the wheels for engaging and pulling the wheel 15 down at the front, a stop to limit the downward movement of the bar and wheel, a lifting and falling bar for engaging and pulling down the wheel 16 at the rear, a stop for limiting the downward movement of said wheel and bar, and means for locking each wheel.

12. In a calculating-machine, a rotatable toothed wheel having numerals, a laterally and vertically movable tooth-engaging keybar for moving said wheel, a second rotatable wheel having numerals, and means for partially rotating the second wheel upon a com: plete rotation of the first wheel including a device having a combined vertical and lateral movement.

13. In a, calculatingmachine, a toothed wheel having numerals, a laterally and vertically movable tooth-engaging key-bar for moving said wheel, a second wheel having numerals, and means for partially rotating the second wheel upon a'complete rotation of the first wheel in a direction opposite to that of the latter including a spring-retracted bar pivoted to have a vertical and a lateral movement for engaging and disengaging the second wheel.

14. In an adding-machine, a shaft, a pair of wheels thereon in verticallyjoining relation, each having peripheral numerals and teeth, the latter standing in opposite directions from the rim of each wheel, a motorbar engaging the wheel 15 at the front for rptating it forward, and means for partially rotating the wheel 16 backward, including a bar arranged. across the diameter of the wheel 15, its free end extending to and crossing the rear of both wheels, and terminating in a dog for engaging the wheel 16, a cam on the shaft for lifting said bar, a disk fixed to rotate with the wheel 15, and having a tappet, and a tappet on the bar, the tappets and the cam having such relation as to cause the free end of the bar to be lifted in advance of the joint action of the tappets to move the bar laterally.

15. In an adding-machine, a casing, a shaft therein, a pair of wheels loose thereon in vertical joining relation, each having peripheral numerals and teeth standing parallel to the axis in opposite directions from the edge of the rim of each wheel, a motor-bar 23 for engaging the wheel 15 at the front for rotating it forward, a drop-bar 58 for engaging the wheel 16 for rotating it backward, means op-.

erated by the wheel 15 to release such engagement, a stop to limit the descent of the motorbar, a stop to limit the descent of the dropbar, means for limiting its range of move ment a distance of one point, a retractingspring for each Wheel, a spring-dog for locking and releasing each wheel, the motor-bar and the spring-dogs each having a handle at the front for operating it.

16. In an add ing-machine, a casing, a shaft therein, a pair of wheels loose thereon in vertical joining relation, each having peripheral numerals and teeth standing parallel to the axis in opposite directions from the edge of the rim of each wheel, the numerals of each wheel in alinement with the spaces between the teeth, means for operating the wheels in opposite directions and means for limiting such rotation so that every movement of the wheels for every addition will bring the teeth of both wheels in alinement and the numerals of each wheel in alinement with the spaces between the teeth and the extent of the movement of the dollar-wheel will be limited to the distance equal to two of its teeth.

17. In an addingmachine, a casing, a shaft therein, a pair of wheels loose thereon joining side by side each having peripheral numerals and teeth standing parallel to the axis in opposite directions from the edge of the rim of each wheel, the numerals of each wheel in alinement with the spaces between the teeth, a hand-operated bar extending through the front of the casing for engaging the teeth at the side of one of the wheels, to rotate it forward and a pivoted bar at the side of the same wheel extending rearward, and terminating at the rear of the wheels, means automatically operating said bar to rotate the other wheel by engagement with its teeth at its rear side, stops to limit and determin the range of movement of each wheel, and a column of numerals at the front cooperating with the numerals of both wheels to make the addition.

18. In a calculating-machine, a toothed wheel having numerals, and teeth, a laterally and vertically movable tooth-engaging keybar for rotating it, a second toothed wheel having numerals, a spring-retracted bar hav ing a tooth-engaging dog, an arm having a downward-inclined end for laterally moving the bar and a cam for vertically moving the bar.

19. In a calculating-machine, a toothed wheel having numerals and teeth, a laterally and vertically movable tootlrengaging keybar for rotating it, a second toothed wheel having numerals, a bar mounted at one end to have up-and-down and right-and-left movements, a tooth-engaging dogat the opposite end of the bar, a cam for imparting to the bar its vertical movement against spring action and a downward incline arranged to receive the fall of said bar to impart to it its lateral movement against spring action.

20. In an addingmachine ,a pair of numeralwh'eels joining vertically side by side on the same shaft and rotatable in reverse directions, a separate motor-bar for each Wheel, one motor-bar the means for operating the other, each having a falling movement to engage and pull down its engaged Wheel, the movement having a tappet coacting With the disk-tappet of one-being by hand, that of the other being and having a pull-down spring at its rear end, automatic. v for operation in the Way described.

21. In an adding-machine,a pair of numeral- In testimony whereof I aflix my signature in 5 Wheels joining vertically side by side on the presence of tWo Witnesses.

same shaft and rotatable in reverse directions;

a disk having a tappet, and a cam both rota- THEODORE WYHEELER table With the forward rotating Wheel, a mo- Witnesses: tor-bar for the latter Wheel and a motor-bar A. E. H. J OHNSON,

IQ for the rearward rotating Wheel, the latter bar GUY HAMILTON JOHNSON.

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