US655653A - Calculator. - Google Patents

Description

No. 555,553. Patented Aug. '7, I900.

a. J. GNAU.

CALCULATOR.

(Application filed Oct. 28, 1899.)

(N0 llodal.)

Ian 071662" 2 7e J7vww THE Nonms PETERS co., PHoTo-uma, WASHINGYON, D4 0.

r-TED TATES PATENT OFFICE.

GEORGE J. GNAU, OF DETROIT, MICHIGAN.

CALCU LATOR.

SPECIFICATION forming part of Letters Patent No. 655,653, dated August '7, 1900.

Application filed October 28, 1899. $erial No. 734,571. (No model.)

To all whom, it may cancer-n.-

Be it known that I, GEORGE J. GNAU, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Calculators, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates generally to calculators,and has particular reference to a machine of this type especially designed for computing the wages of employees for any number of hours, days, or parts thereof.

The invention consists in the novel constructionof a calculator of this type and in the peculiar arrangement, construction, and combination of its various parts, all as more fully hereinafter described, and shown in the drawings, in which- Figure 1 is a perspective View of the calculator. Fig. 2 is a vertical central section therethrough. Fig. 3 is an enlarged sectional view of a portion of the mechanism shown in Fig. 2. Fig. 4 is an enlarged front elevation of the computing portion of the calculator. Fig. 5 is a view of the calculator with the front of the casing removed, showing the formation of the computing-disks; and Fig. 6 is a section on line 00 :0, Fig. 2.

In construction the calculator consists, essentially, of an inclosed casing having a segmental opening or radial slot formed in the front thereof and provided at one or both sides of the opening with a column of factors of value, one or more disks mounted for rotary movement within the casing and having radial columns of computations thereon adapted to be viewed through the casingopening, and means for rotating the disks independently to bring the radial columns thereon in reading relation to the column or columns on the casing-front.

More particularly the construction of the calculator is as follows:

The reference-letter A designates the inclosing casing, which is preferably semicircular or su bstantially semicircular in configuration to allow of its being arranged upon a desk or table in convenient relation to the operator.

B designates a supporting-arm hinged to the casing-back 0, adapted to maintain the casing in a substantially upright position upon its flat side orbase D. The casing-front is slotted radially, as at E, the opening being substantially the segnlent of a circle, and upon one or both sides of said radial opening is a series of factors designating the rate of Wages per week or the rate per day, or both, as plainly shown in Fig. 4. I also preferably mark above these columns suitable lettering, as Week rate or Day rate, to indicate What the particular factors are, and upon the portion of the casing immediately above the radial slot is marked the Word Hours. The front and back covers F and O of the casing are each apertured, as at b and a, and secured to the covers are the apertured bearingplates 0 and d, the plates being so arranged that the apertures therein will register with the apertures in the covers.

The reference-letter F designates a sleeve journaled within the apertured cover F and extending some distance Within the casing. Upon this sleeve is secured in any suitable manner, as by brazing, a flanged sleeve or thimblef, as plainly shown in Fig. 3, and I designates an outer disk fixedly secured in any suitable manner to the flanged portion of the thimble. This disk is provided with a ra dial slot similar in formation and size to the segmental opening in the casing-front, and has marked upon its periphery factors of time in hours or parts thereof from 1% to 27117. Beneath each factor of time is arranged a radial column of computations of value designating the amount of wages due at different rates per week for the period of time above the column.

H designates a thumb-nut which is adapted to be threaded upon the portion 7a of the sleeve which extends beyond the front of the casing, whereby the disk may be rotated to bring the columns of computations thereon in reading relation to the column upon the side of the slot in the casing-front.

In order that wages may be computed for a longer period than is permissible by the use of a single disk, I have provided a second or inner disk G within the casing, marked in a similar manner to the outer disk, but of greater diameter than said latter disk in order that the peripheral marking thereon will not be covered by the outer disk. Upon the periphery the factors of time are arranged in the same manner, but are a continuation of the factors upon the outer disk, commencing in this particular case with 28 and reading in whole numbers and fractions to 54: 3.

The disk just described is mounted for retary movement within the casing and is provided with means for operating the same independently of the complementary disk, as follows:

The reference-letter J designates a spindle which is journaled within the sleeve F and extends through and beyond the outer disk carried by said sleeve and likewise projects some distance beyond the thumb-nut upon the sleeve. At its inner end the spindle is reduced in diameter, as atj, and has a hearing within the apertured back cover of the casing, as plainly shown in Fig. 3. Upon the reduced portion is brazed or secured in any suitable manner a thimble 7t, similar in construction to the thimble before described, and to this thimble is attached the inner disk, the securing devices being of any preferable type. A thumb-nut L has a threaded engagement with the portion of the spindle that projects beyond the nut II to permit of the inner disk being rotated independently.

The construction of my calculator having been thus set forth, the operation of the same is as follows: Supposing that it is desired to calculate the amount due an employee who is paid at the rate of fifteen dollars per week for a period of one hour, to ascertain the amount the outer disk is rotated until the factor of time required-via, one hour-is brought to view within the radial opening in the casing-front. The operator next finds the rate per week in the column upon the casing adjacent the opening that is required viz., fifteenand the computation in the ra dial column' upon the outer disk adjacent to the numerals 15 will give the desired amount. In cases where the amount that is to be computed is for a greater number of hours than appear upon the outer disk the segmental opening in said outer disk is brought into coincidence with the opening in the casing-front. This permits the radial columns upon the inner disk to be seen, and the operation above described is repeated, the number of hours being first found and the radial column beneath the factor of time being placed in reading relation with the columns upon the casing-front. In order that the calculator may be operated rapidly, I have provided means whereby the outer disk will be held stationary when the openings in the latter and the casing are in coincidence to permit of a rapid reading upon the inner disk. The means referred to are in the form of a friction-lock,which is of very simple construction, consisting, essentially, of a depending finger Z,which projects downwardly from the casing-top m between the outer and inner disks, and lugs o 0 upon the rear face of the outer disk and on the periphery of the latter spaced from each other sufficiently to permit of their engagement upon the opposite sides of the depending finger. The lugs are arranged directly above the radial opening in the outer disk in order that the latter opening and the casing-opening will be in coincidence.

It will be readily observed from the description of my invention that factors for any period of time may be arranged upon the easing-front adjacent to the opening therein and also that the day rate which I have shown may be entirely dispensed with, if desired. I merely employ the same as a matter of convenience to dispense with the manipulation of the calculator when only the amount per day is to be figured.

What I claim as my invention is- 1. In a calculator, the combination of an inclosing casing having a segmental opening formed in the front thereof, and provided upon one side of said opening with a column of factors of value, an outer disk rotatably mounted within the casing, provided with a segmental opening corresponding to the opening in the casing-front, and having marked upon its periphery factors of time, and below each of said factors a radial column of computations of value, an inner disk of greater diameter than the outer disk, having markings thereon similar to those on the latter disk, a friction mechanism for holding the opening in the outer disk in coincidence with the casing-opening, comprising a depending finger extending downwardly from the inner face of the casing-top to and between the disks, and spaced lugs upon the outer disk above the radial opening adapted to engage upon opposite sides of said finger, and means for rotating the disks independently of each other in the manner and for the purpose described.

2. In a calculator, the combination of an. inclosing casing provided with front and rear covers, bearing-plates thereon, a spindle journaled at its inner end in the inner bearingplate and projecting through the outer plate, a disk secured to the inner end of the spindle, a sleeve journaled on the spindle and in the outer bearing-plate, a disk secured to the inner end of the sleeve, and actuating-heads detachably secured to the outer ends of said spindle and sleeve.

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

GEORGE .I. GNAU.

Witnesses:

L. J. Wnrrrnnonn, II. 0. SMITH.

ICC

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