US879204A - Calculating-machine. - Google Patents

Description

PATBNTED PEB. 18, 1908.l

y No. $219,204.

' G. J. SMITH.

GALGULATING MACHINE.

2 SHEETS-SHEET APPLICATION FILED APE.1, 1907.

' PATBNTED PEB.18, 1908.

G. J. SMITH. GALGULATING MACHINE.

APPLICATION FILED AFR. 1, 1907.

A2 SHEETS-SHEET 2.

.nection with the accompanying' drawings, ,is

is a side elevation of the index g the index rod CHESTER J. SMITH, OF .TAMESTOWN, NEW YORK.

cALoULATrN-MACHINE.

Specication .of Letters Patent.

Patented Feb. 18, 1908.

Application filed April l. 1907. Serial No. 365.734.

To all whom it may concern:

Be it known that I, CHESTER J. SMITH, a citizen of the United States, residing at Jamestown, in the county of Chautauqua and State of New York, have invented new and useful Improvements in Calculating-Ma chines, of which the following, taken in cona full, clear, and exact description.

The invention relates to calculating machines, more particularlyfor calculating wages, or interest-or the price of a commodity; and the objects of the invention are first, to provide a simple mechanismv which is cheap to manufacture, in which for example the table showing the rate per hour and those showing the fractions of an hour may be brought into such conjunction that the amounts may be simultaneousljyT read from the two tables; and second, to provide means whereby the adjoining figures in the tables are covered from sight to prevent error, so that only the correct amount at the prescribed rate is readable.

In the drawings, Figure 1 is a perspective view of the machine with certain portions of the case broken away in order to show a portion of the tables and operating mechanism.

ig. 2 is a crosswise sectional view of the ma chine. Fig. 3 is an end view of the two rolls showing the intermeshing gears and the spring dog which controls the large roll, Fig.v 4 is an enlarged view of a section vof the case, showing the form of holder for the rate numbers and the depression for the index rod. Fig. 5 is a plan view of the index; and Fig. 6

and case underneath in section.

Similar numerals refer to parts in the several views.

, The numeral 1() indicates the case which is preferably made of sheet metal in substantially cylindrical form with cast metal ends 11 which are so formed as, to provide suitable supports for the case and also revolubly support the'rods 12 and 13 upon which the rolls or cylinders 14 and 15 aremounted within case 10. The rolls or cylinders are made hollow and have suitable disk shaped ends to the index being shown corresponding mount the cylinders 14 and 15 on rods 12l and 13. A hand wheel 16 is provided on the end of rod 12 and a knob 17 on the end of rod 13 in order to turn the same.

One end of each of the cylinders 14 and 15is provided with intermeshing teeth or gears 18 and 19, as shown in Figs. 1 and 3; the teeth being of such size as to move the cylinder exactly one line of numerals. Thus, for example, the numerals, as shown are for hours on cylinder 14, and for fractions of an hour on cylinder 15. Consequently teeth 18 and 19 should be of such a size as to correspond to the size of the numerals so that cylinder 14 will stop exactly lon the hour and cylinder 15 on each five minute fraction of an hour. A spring ratchet 20 is provided within the upper side of the case 10 having a roller to engage teeth 18, said roller working easily backward or forward over the rounded ends of teeth 18. Ratchet 20 stops the cylinder 14 exactly on the hour.

A lengthwise slot 21 is provided on the front side of the case l() to reveal the amounts in the table for each consecutive number of hours, which table is placed on the outer side of cylinder 14, the hours being placed at the center and the computations according to the rate per hour being arranged horizontally on each side of the number of hours.

A flanged holder 22 is attached to the case immediately below and adjacent to slot 21 to receive -,the rate slip. It is preferably placed' below instead of above the slot 1n order that it-shall not cast a shadowover the numerals in slot 21 and also to lbe more easily readable, as hereinafter set forth. T he different rates per hour are placed upon a strip of paper which is slipped into holder 22 so that the rates are in line with and close to the amount for any given number of hours.

A slot 23 is provided in case 10 in front of roll 15 parallel to slot 21, to be used in relation to roll 15 in the same manner as slot 21 is used in relation to roll 14. A rod 24 is provided mid-way between slots 21 and 23, and upon rod 24 an index 25 is slidably mounted so that the index may be slipped back and forth from one end .to the other of the rolls. The upper end of the index 25 slides under the edge of case 10 adjacent to slot 21.

i reading glasses 'fr0 'made of suiicient clength to allow 50 17, and wheel 16 is then turned until attained on roll 14.

cc hours appearsin slot 21.

Index is an important part oi 'my invention. lt is made sul'hciently broad to allow an opening 26 therein of sufficient length to take in the amounts on roll 1a. A

o similar opening 27 is provided lor the rate i opening the lower end, Winch is oney numerals in rate holder 22, and 28 is provided at half the sizeof opening 26, and is placed in line with the right end of openings 26 and 27 cent, column; since the amount for the fraction of an hour would not reach above the dollar mark. Openings 26, 27 and 28 are preferably filled with suitable magnifying or to easily read the small iigures which are necessary in such a table in order'to diminish the Jize of rolls 14 and 15. Index 25 is made sufficiently Wide also to cover `the numerals each side of the openings 2o 25, 27 and 2S, thereby preventing error. y

To use my device, the accountant slides index 25 on rod 24 to the rate per, hour desired, which rate Will show through opening 27. l-le then turns the cylinders to the de- 25 sired number of hours and fraction of an lie then reads the amount in opening n hour. l 26 and adds to it the number oi cents shown in opening 28 which gives hint ther exact amount for the number of hours and fraction 3o of an hour, provided he has turned the cylinders 14 and 15l correctly. A. small knob 29 is provided on index 25 for the easy handling of the same.

in order4 to uicldy turn the cylinders 11i and 15 to the esired point, they are geared turned independent of the other While thus held out. of mesh. ln order to quickly adjust the rolls, however, it is found exceedingly convenient to hold the rolls in mesh by pressingagainst spring 31 by means of knob the desired number of hours is attained or nearly Willen it is apparent l l l le and being one-hali the size covers only the l that Athe roll is nearing this point, the small I roll 15, which has probably made a number of revolutions in the turning of thebig roll, is

released from contact with the big` roll as said small roll approaches the fractional amount desired. The turning el the large roll is continued until the desired number of lt is only necesoi" hours to sary to cause the desired number number of appear in slot 21 and the desired minutes to appear in slot 23 and to slide index lubly mounted in said case,

sraaoe 25 to the desired rate in order to read the exact amount nue for the number' ol' hours plus the number ol cents lor the minutes, to calculate the exact amount lor a given time.

lt is apparent that interest may easily be calculated upon my device by placing a table with the number ol days and ciimputations .on tlulargc wheel, the interest rates being placed in the holder 22, and the months and computations being placed on the smaller roll 15. .it is also obvious that the computation ofthe selling or cost price of com 'modities by the pound or by the yard may be greatly accelerated by the use of my device. As, for example, the cost of coal er ton vmay be computed by placing the ta le upon roll 14 extending Jfrom one pound to one hundred and placing the number of hundred pound computation on the small roll 15, the different rates per ton being placed in the rate holder 22, then by sliding index 25 along rod 24, until opening 27 is over the desired rate per ton, and turning the cylinders 14 and 15 until the number of hundred pounds and fractions. of a hundred are 'readable in the openings 25 and 28, thereby giving the com putation at once and greatly aiding in the quick calculation of such sales'.l it is also aparent that additional rolls may be added with additional slots therefor in case 1G Where it is desired to handle a greater number of fractional parts in the computation, it only being necessary to provide additional openings in index 25, the ollice of the index 25 being to bring the desired computations into quick relation one to the other so that they may be added together.

l claim as neWz- 1. ln a calculating machine, a case having parallel slots therein, cylinders revolubly mounted in said case opposite said slots, computations arranged in annular and horizontal lines on `said cylinders, an index slidably mounted in saidcase having openings opposite said slot, gear teeth on said cylinders, said cylinders resiliently held apart to be pressed into gear when desired. f

2. ln a calculating machine, a case having lengthwise parallel slots', cylinders revolubly mounted in said case opposite said slots, gears on said cylinders and a spring to hold said gears out of mesh, computations arranged on said cylinders in series corresponding to said slots, a rod on said case'between and parallel to said slot, a price holder on said case betivecn and parallel to said slots, an index slidably mounted on said rod and extending over said price holder and'slots, said index having openings o )posite said slots and price holder, substantially as and for the purpose specified.

3. ln a calculating machine, a case 10 hav-` ing slots 21 and 23, cylinders 14 and 15 revokn'obs 16 and 17 for turning said cylinders, hour oomputal said gears out of mesh, substantially as and 1G tions on vthe le'rge Wheel and minute oompufor the purpose specified.

tations on the'srnall Wheel in'annular and n testimony whereof have signed my horizontal lines, price holder 22 on said case, i name to this specification in the presence of an indeX 25 sldably mounted on rod 24 in I two subscribing Witnesses. 1 said case, said index having openings 26 27'; CHESTER J. SMITH. and 28 opposite said slots and price holdnf; l Witnesses: gears 18 and 19 on said cylinders, a slot 30 in I. A. ELLsWoRTH,

' said case, and a'spring 31 on said case to hold A. W. KETTLE.

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