US11726A

US11726A - Machine for

Info

Publication number: US11726A
Authority: US
Publication date: 1854-09-26
Anticipated expiration: 1871-09-26

Description

A. L. HATFIELD.

Calcuiator. No. 11,726. Patented Sept. 26, 1854.

FIG. .6"

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N. PETERS. Plvoto-Lilhognphur. washmglom n. C.

UNITED srnrss PATENT orr on.

AARON L. HATFIELD, OF LEYVISBURG, PENNSYLVANIA.

MACHINE FOR ADDING NUMBERS.

Specification of Letters Patent No. 11,726, dated September 26, 1854. J-

To all whom it may concern:

Be it known that I, AARON L. HA'rrmLn, of Lewisburg, in the county of Union, State of Pennsylvania, have invent-ed a new and useful Instrument for Reckoning Figures.

The nature of my invention consists in providing a series oi circular metallic disks having numbers stamped thereon, so arranged, in connection with springs, that by the alternate movement of a lever, any number of figures, from 1 up to 10,000, or more, may be correctly and easily added together before the eye.

To enable others skilled in the art to make and use my invention, 1 will proceed to describe its construction and operation, reference being had to the annexed drawings forming part of this specification, in which Figure 1 is a vertical view of one of my instruments. Figs. 2 and 3 are also vertical views. Fig. 1 is a vertical section. Fig. 5 is a top view of one o-t'the disks. Fig. 6 is a bottom View of the same. Fig. 7 is a vertical view of the case with the disks removed. Fig. 8 is a bottom view of disk C.

Similar letters refer to like parts.

A, is the case; B, the outer disk and lining; C, the intermediate disk; D, the upper disk; E, the lower disk; F, center pivot; G, reckoning-lever; H, washer; a, fixed cam attached to the bottom side of the disk E; Z), stop on the outer disk B; 0, slots cut entirely through the intermediate disk 0; (Z, teeth sunk in the upper side of the disk D; 6", points of reference to the disk; d, steady pins; f, pin in pivot; g, handle in the lever G; 9, slotcut through the lever G.

is is a spring-ratchet; 00, spring fastened on the lower side of the lining B; y, springratchet attached to the lining B.

The disk D has numbers upon its outer edge commencing from 1 and running up to 100 in the manner indicated in various figures. The disk C has numbers upon its outer edge commencing at 100 and running by hundreds up to 10,000 or more. The disk B has numbers upon its outer edge commencing at 1 and running up to 100.

The disk B, C, D and the reckoning-lever G, are fastened together by means of a pin, f, passing through the pivot F, and the washer H. The steady pins cl pass up from the lower disk E, through the opening in the center of the disk G into corresponding holes in the disk D; consequently there are no ineans of turning the disk C except the triotion consequent upon its being placed between the two disks D and E, while the disks D and E move simultaneously as if they were made in one piece by means of the steady pins d.

Suppose now that the reckoning-lever G is turned against the stop I) as seen in Fig. 1, through the slot 9 may be read the figures 5,200 on the disk C, and 6 on the disk D. Suppose now that it is desirable to add to this amount 15; in order to do so the reckoning-lever G is turned around in the direction of the arrow until the slot arrives over the figures 15 on the disk B. The position of the lever and slot is seen at Fig. 2. The lever is now pushed back again to the stop 6, and the spring-ratchet 7c catching in one of the sunken teeth on the disk D carries the disk D with it and the lever, and when the lever arrives against the stop Z) the correct sum will be observed on looking through the slot 9 as shown in Fig. 3, the amount now before the eye being 5 200 and 21.

On the lower side of the disk E sunken teeth 6 are cut around the outer edge as seen in Fig. 6. Into these teeth the springratchet 3 takes and prevents the disk E, and consequently the disk, D, from moving, while the reckoning-lever G is being turned in the direction 01": the arrow, but permits the turning of the disks E and D when the reckoning-lever G is moved in the contrary direction. The disk C being pressed between the two disks D and E, would revolve with these disks, by reason of the friction, were there no means to prevent it. To accomplish this the disk G is bent to ward its outer edge in the form seen in Fig. L; and through the bend thus made slots are cut entirely through, as seen at 0 in Fig. 8. Into these slots the spring-lever m, Figs. 4 and 7, catches and prevents the disk C from revolving. In order, therefore, that the disk C may be moved at the proper time some means must be devised for releasing the spring 00. This is done by the cam a, affixed tothe bot-tom of the disk E. At every entire revolution of the disk E the cam a, comes around and striking the spring 00, as seen in Fig. 4, bears it down until the cam 64 has passed the spring 00, when the latter flies up again, and stops the disk, the movement of the disk C at this time is only equivalent to one notch, which exhibits a corresponding increase of 100 in the figthe slots cut in the curve; the outer disk ures seen through the slot 9. Therefore as and lining B with springs w and y, the often as 100 is reckoned by the disk D the disk E with its sunken teeth 0, cam a and disk 0 is moved forward one notch, and steady pins d, the whole being arranged 15 5 in this manner the correctness of the sums and combined in the manner and for the reckoned is insured at the slot 9. purposes set forth, or, in any other manner Having thus described my invention I substantially the same.

A. -L. HATFIELD. [L.s.]

claim The slotted reckoning-lever G with the Witnesses: 10 spring-ratchet is attached; the disk D with H. P. SHELLER,

its sunken teeth; the curved disk C, With HENRY C. HIoKoK.