US1181819A - Calculator. - Google Patents

Description

H. A. WRENN.

CALCULATOR.

APPLCATlON FILED JUNEZ, 1915. 1,181,193 Patented May 2,1916.

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H. A. WRENN.

CALCULATOR. APPLICATloN FILED JUNE 26.1915.

Patented May 2, 1916.

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CALCULATOR. APPUCATN FILED UNE 25,1915. 1, 1 81,81 9. Patented May 2, 1916 3SHEETS-SHEET 3|- UNTED STATES PATENT oFiiioE.

HERBERT A. "TR'ENN, WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR OF ONE- HALF TO STERLING H. WATSON, OF WASHINGTON, DISTRICT OF COLUMBIA. l

CALCULATOR'.

Specification of Letters Patent.

To all whom it may concern Be it known that I, HERBERT A; WRENN,"

acitizen of the United States, residingat VVashingto-n, District of Columbia, have inf vented certain new and useful Improvements in Calculators, of which the followning. is a specification, reference being had therein to the .accompanying drawing.

This invention relates to new and useful improvements in calculating apparatus, designed especially for adding, subtracting, multiplying and dividing.

The invention comprises-a simple and eilicient apparatus of'thisnature having various details o-f construction, combinations and arrangements of parts which will be hereinafter fully described, shown in the accompanying drawings and then specifically defined' in the appended claims.

-My invention is illustrated in the accompanying drawings, in which:

Figure 1 is a frontI elevation of a calculating apparatus, parts beingI broken away to better illustrate featuresl of the invention. Fig. 2 is a central -ve'rtical sectional view through the calculator. Fig. 3 is an enlarged detail in elevation of the transferring or carrier features of the invention. Fig. 4:

- is an enlarged detail p'erspectiveview showing a resilient tension means.. Fig. 5 is a detail perspective view of a portion of an endless chain with a modified ,link utilized for clearingl the wlieels. Fig. 6 is a detail view of a feature of the invention for imparting an intermittentl movement' to the endless.

chain, and Fig. 7 is a. detail view of a portion of the carrier device.

Reference now being had to the details of the drawings by numeral, 1 designates the frame of the calculator which may be of any shape or size and mounted within the casing Iis a .shaft 2 upon which a series of numeral bearing wheels 3 are journaled which carry two sets of numerals upon the projecting portion 4 thereof, one set .being designated in the drawings by numeral 5 and the other set by numeral 6,

numerals at the left hand corner of the facehe latter bearing the small upon which the larger numerals appear.

-Said wheels, details of which are shown in I Fig. 3 of the drawings, are made preferably of a. stamped up piece of metal with an integral cam 7 upon one face thereofI and each wheel has a cylindrical bearing portion 7.

Fastenedfto the upper surface of the bottom of the casing is a cross-piece S. a detail of a portion of which is shown in Fig. 4 of the drawings. and which has notches 9 upon theJ forward edge thereof. Resilient, bailshaped members 10 have their opposite sides.

passing through the'notches and horizontal portions 11 pass underneath the crosspiece and the hooks l2 at the ends thereof engage over .the rear edge of the cross-piece, said bail-shaped portion being disposed normally at an angle, as shown inthe drawings, and

Patented May 2, 1916.

being resilient andserving as a tension means 'A' for the purpose presently to be described. Endless chains, made up of links 13, are connected together and everyl tenth link, which is designated by-numeral 14," a detail of which is shown in Fig. 5, differentiates from the other links in having theprojecting ends lwhich are provided for the purpose of clearing the wheels. y Said links engageover the projecting portions 4 which serve as the equivalents ofteeth of a cog .wheel and which chain also engages over a 'columns of numerals from 0 to 9,' is adapted to be shifted for the purpose of adapting the apparatus for use in adding dollars and cents or for calculating numbers generally, v

the sheet of numerals being at its extreme limit to the, right when calculating dollars and cents andin which position the columnl ,of numerals at the extreme right would be .obscured by the opaque portion 24 upon a transparent covering 25. When the numeral carrying sheet is shifted to theextreme left, the column -ofl figures to the extreme left of the sheet would be covered up by the opaque strip 27 at the edge of the glass cover and the column at the extreme right Awould be disclosed, adapting the apparatus for use in adding, subtracting, multiplying or dividing numbers. The surface upon which said columns of figures appear has vpreferably different colored sections, the first Idesignated by numeral 18 being red, the shading,

ios

designated by numeral 19, being green, the

Asection red and the section 21 green,

forming a convenient means for indicating units, tens, hundreds, thousands, etc. lThe means tor imparting intermittent movements to the chains consists V'of a bar tion ofone end of a spring 31, the other end .of the spring being connected to any aperture 32 inthe flanged bar 33', `which latter also has in lone edge thereofv notches Se in which the' bars 28 are guided in their longitudinalmovements. The lower end of' each bar 28 has an angled lprojection' which in Fig.2, and, when a downward thrust .h is imparted to thebar 28,'said projectionl '28, a detail ofl one of lwhichis shown .Fig.' 6, which has an offset 29 between its vends and is apertured. at 30 for the recepvprojects between the links,'as shown `clearly cominoV ao'ainsttheflower end of the link` r 23 D .will movethe latter and impart a partial revolution to the carrier wheel about which thechain passes. The upper end of each bar 28 has an aperture 36 which receives a pivotal pin 3T, .secured in an aperture 39' inthe L-shapedbarllO, av detail of which is shown in Figi. Said bar 40 has apertures vand 42 Yregistering with each otherandcarries a pivotal pin 43 upon which an anti friction roller te is journaled, said wheel being adapted to travel upon the 'surface of the cam 7.' l..

A bail-shaped member 45 is pivotally mounted upon the pins .46 and 4l', asl shown in" solid lines in Fig. l, and has a handle 48 projectingthrough `a slot 49m one wall of the c asing, said bail-shaped member being. positioned'beyond thevarious series ot chains andv adjacent to their lower ends,

same normally out of the 'path of the chains.

.A'second bail-shaped member is designated by numeral 51', the arms 'of which near their ends are pivotally mounted upon the pins"52.` 'A- spring 53, is secured at one endlto the member 51 and its other end secured to the casing at 54:. A handle 55, which is secured to the member 51, is .shown in solid lines in Fig. 1 and in dottedlines and a spring 50, secured tothe casing, bears'l against the member Zl5 and tends to hold the in Fig. 5, and'hasa movement in a curvedv movement of said member in opposite directions. The transverse portion 5l of the member 51 is adapted to be thrown so as to engage'theseveral'projecting portions 15 of the linkslt when it is desired to clear all of the wheels, it being understood that,v before the wheels may be clearedl` it will be necessary to actuate the bail-shaped. memu ber 45 so that the chains will be thrown out of the. paths of the projections 35 of the' bars28. In the chainsillustrated, every tenth link is of the constructionv shown in Fig. .5 and 4provided lwith the projecting `slot 56,' the ends of the slots limiting the bail-shaped member 51 to with the various projecting portions 15 ol 1 menare ends \15 and whatever numerals may .be

bel caught thereby and the carrier wheelsactuated by the various 'cha-ms will be re-` turned to O.

ln operation of-the apparatus for adding, the fingers ot'the. operator are placed upon the particular numeral about which the marginal edge ofthe link is positioned. rlhechain is' given downward movement until the finger comes in contact with the edge 17. As the links of the chain turn in .disclosed at the sight opening on the vari- 'ous carrier wheels, when the member ll swung downtoward a horizontal position, the projecting ends l5 of the links le will contact with the upper traiisverse.portion y' of the resilient bail-shaped member l0, the

latter will spring back to its normal position, shown in Fig. v2, exerting a tension upon the chain which willtend to aline the numeral at-the slot. lVhen the link on a chain, representing the highest numeral in the column, is brought down to the edge 17, vwhich designates a stop, the cam upon the face of the wheel to the right will have raised 'the l.shaped -bar l() toits vhighest upper limit i' and, when an additional movement 1s imparted to the same chain' to add another number, the end oit the `cam will pass by the antifriction roller and the' spring 3l', which is put under tension as the bar Ll() is being thrown upward, will quickly return the bar 28 to its normal position andY the projection 35 coming in contact with the "link upon an adjacent chainl the links causing the-.chains upon which they appear to be moved correspondingv dis-' tances, the bail-shaped -member t5 first having ben tilted `out of the paths of the projecting ends of the bar 28. in the event -ornit being desired teclear any one numeral hearing wheel independent ol the others. the operator may swing the bail-shaped member l5 through the medium of the handle 48, causing said member ll5 to come in contact with the various chains and impart an outer movement thereto, sothat they will clear the projecting point thus'allowing the chain to beumoved freely upward.

lt will be noted that. wnen the links of the various chains pass by the resilient bailshaped tension device 10, the latter yields lWhen it is desired to clear the .iso

and quickly springs back to its normal position, causing the chain to beheld taut and accurately alining the numerals upon the carrier wheels,

In the manipulatlon of the apparatus for use in subtracting,

the amount of the mmuend by the seriesof A numbers at the `left hand corner -on the pro.-

je'ctinglpart of the ace .4 and which are designated by numeral 6, after which the operator actuates the lchains in the same manner as in addition and -which will show the result bythe series'of numerals designated bynumeral'. f

In the vuse of the calculator for multiplying, assuming for instance that it is desired to .multiply Qby 25, the finger of the erator' is placed upon the numeral 2 in the 5 inthe tens column, twice and which 'is and then, by placing ing down in the second column to the down to'the stop line 17 the finger upon the link about the numeral 5, in the units column, draws the lchaindown to the stop and this is repeated live times, the equivalent of adding v ivetimes.. Then," the linger of the opten's column, right, and drawn erator 'is placed in the' -numeral 2 in the third column, representing hundreds, pullthe chain tol the stop line twice, -and thence the link, designated by numeral equivalent 'of adding 25 twenty times. The

. result will appearjat' thesight aperture, designated through 35,.

Pdivisiom the chains are manipulated in order the various numerals 5. In the'manipulation of `the vcalculator for to bring the various numerals 6 lto designate the dividend the sight aperture, after whichthejchains. are manipulated as in subtraction, the dividend being treated as a n 1 rninuendandv the divisor as a subtrahend, 7 lthat is, if. in vthe 'tens column, the link desigejnating the-first numeral in the subtrahend is pulled down tothe stopline 17 and-then the 50. .to be indicated at'the sight slot above. This ldown to the stop line.

v.units numeral of .the sub'trahendA is brought Thev quotient isindicated by pulling down'the chain at the exmovement extremicl ft each time a quotient numeral is thc various wheels are actuated by the chains in order to disclose In the manipulation 'of the apparatus for the various uses for whic the tension means to aline-'the-numerals is it is provided,

the' same,'that is the yielding bail-shaped A member 10 quickly applying the tension to 'the chains to cause the numerals upon the carrier wheels to aline, and at the comple positioned, to return the wheels to desigiv What I claim to be new is 1. In a calculating machine, a series ot carrier wheels mountedc therein, vtension members, chains madeup of links moving 'about `said carrier wheels and said tension the latter adapted to aline the l members, links ofi the chains,

2. In a calculating machine, a series of carrier wheels mounted therein, chains made up of links moving about said carrier wheels,

stationary,

the tilting of the bail-shaped member 45,

bail-shaped tension members' about which the links of said chains pass,A

i treme leftl end of the series, an intermittent being-impartedtothe chain at the manipulation is repeated until the number f i remaining divisor, the remainder being indicated at the in the dividend is less than the sightaperture at the right of the sight slot.

ing the the latter ladapted to aline the said links. the- 3, In al calculating machine, a `series of carrierwheels mounted therein, Vtension members, chains made upfof links movable about'the carrier wheels and saidtens'ion members,l the'latter adapted to aline the vlinks of the chains, longitudinally movable,

spring-pressed bars adapted to engage the links of the chains, and means oroperating saidbars in one direction.

4'. In a calculating machine, a series of carrier wheels mounted therein, chains made up of links movable about the carrier wheels, longitudinally movable, springvpressed 'bars normally in engagement `with said links for causing an intermittent movement to be imparted to the chains,l and means for throwlinks out of the paths' of the engaging end of said bars to allow the, chains to be operated in. reverse direction.

In'testimony whereof I hereunto atlin mysignature in presence ofltwo witnesses.

Witnesses:

. A. L. HoU'GH, l LS. WATsoN.

HERBERT A. VRENN. v

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