US3100602A

US3100602A - figures

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Publication number: US3100602A
Authority: US
Publication date: 1963-08-13
Anticipated expiration: 1980-08-13

Description

Aug. 13, 1963v I sHu K. LEAR voo 3,100,602

` CALCULATING MACHINE -Filed Feb. 4. 1960 V 'l sheets-sheet 1 JWTOR. Swear 007 Aug- 13 1963 sHU K. LEAR voo 3,100,602

ALCULATING MACHINE Filed Feb. 4, 19Go 7 sheets-sheet 2 .IN V EN TOR.

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Aug. 13, 1963 sHu K; L EAR voo CALCULATING MACHINE 7 Sheets-Sheet 3 Filed Feb. 4. 1060 Sv G,

Aug 13, 1963 sHU K. LEAR voo 3,100,602

CALCULATING MACHINE Fiqd Feb. 4. 1960 7 4sheets-sheet 4 .5. /Qfl edf [Dlllllllll ill I'Alll CALCULA'TING MACHINE '7 Sheets-Sheet 5 Filed Feb. 4, 1960 Aug. 13, 1963 sHu K. LEAR voo CALCULATING MACHINE 7 Sheets-Sheet 6 Aug. 13, 1963 sHu K. LEAR voo CALCULATING MACHINE Filed Feb. 4, 1960 v INVEN T R 5. Klear. 00.

:4 www States 3,100,602 CALCULATING'MACHINE Shu K. Lear Voo, 298 Lakewood Blvd., Park Filed Feb. 4, 1960, Ser. No. 6,758 Claims. (Cl. 23S-63) Forest, Ill..

This invention relates to calculating machines and more particularly to the key-powered, lor keyaoperated, type of calculating machine wherein a numeral wheel is acltuated directly by depression of a numenal key.

Conventionally, :this type tot key-powered, or key-operated, calculating machine has a plurality of numeral wheels and a plurality of banks of numeral keys, each bank having nine keys marked 1 to and through 9 respeotively, one bankof said keys for actuation of one orf said wheels, and is capable tot performing addition, subtnaction, and multiplication with their respective results displayed on said Wheels but is incapable 'of performing division with its quotient indicated on said wheels.

It Vis the principal objectief rthis invention to provide a ten-key keyboard key-powered, or key-operated, calculating machine having a plurality 'oct numeral Wheels arranged in denominational Iorder and a series of ten numenal keys marked (l -to and through 9 respectively, and means whereby Vupon depression yot anyone of said numeral keys, any one of said numeral wheels in operative relation therewith may be actuated to indicate thereon a number that has been increased by the number marked on said depressed numeral key andalternately to indicate thereon a number that has been decreased by the number marked on said depressed numeral key, and whereby upon ,release of depression of said depressed 31,100,602 Patented Aug. 13, 1963 and eicient device tofyariably numerate the numenals indicated on lsaid numeral wheels.

Other objects-and advantages lof this invention will become :apparent (from the detailed description of the prenumeral key, all `of said numeral keys are bnought from a numeral wheel initially in operative relation therewith toa nrumenal wheel of next lower order to be in operative relation therewith, and to :a numeral wheel of higher order to be in :operative relation therewith when said depressed numeral key was initially in operative relation with the numenal wheel of the lowest order; and funther having an independent manipulative member whereby upon actuation thereof all of said numeral keys are brought from a numeral Wheel initially in operative relation therewith to a numeral wheel of higher order to be in operative relation therewith; and further having means to automatically increase the value of -a numeral wheel by one when an adjacent numeral wheel of next lower order shall have an -accumulated value exceeding nine and alternately to automatically decrease thevalue of anumeral Wheel by one when an adjacent numeral wheel of next lower order shall have a residual value of less than z ero; and further having means to simultaneously zeroise all those Vof said numeral wheels that are not indicating zero; and further having means to automatically register quotient of divisi-on on said numeral wheels; and further having means to yaria'bly numerate the numerals indicated on `said numeral wheels; said machine being capable of per- A furthernbject is to provide for a calculating machine having a plurality of numeral wheels, 1a new novel and eflicient means to simultaneously zeroise all those of said numeral Vwheels that are notv indicating zero.

A further `object is to provide for a calculating ma- [ferred embodiment illustrated in the accompanying drawings, in which:

FIGURE l is a perspective View of a ten-key keyboard key-operated calculating machine embodying the features of this invention in substantially its actual size.

FIGURE 2 is. a plan view off the machine with its outer case removed, showing an operative mechanism 'with certain pants omitted tor clarity.

FIGURE 3 is a vertical sectional View of the machine taken in a plane on Vthe line 3 3 of FIGURE 2 showing an assembly of numeral wheels and its related mechanism.

vFIGURE 4 is a vertical-sectional View of the machine l taken in a plane on the line 4 4 of FIGURE 2 showing a series of numeral keys and their associated mechanism.

FIGURE 5 isan enlarged fragmentary vertical sectional view of la carriage embodying a principal actuating gear, a pointer attached to said carriage, a shift key, a horizontal actuating rack pivoted on a horizontal actuating bar in operative relation with two ratchets and an escapement mechanism.

FIGURE 6` is a vertical sectional 'View of the machine taken in 'a plane on the line 6 6 of FIGURE 2 showing a numeralwheel in operative relation with a principal actuatingV geary and a transfer gear, a carriage for said actuating gear, a pointer attached to said carriage, and a numeral key.

FIGURE 7 is a vertical section-al View of the machine taken in a plane on the line 7 7 of FIGURE 2 showing a numeral wheel in operative relation with a second actuating gear and ya transfer gear, a second carriage for said second actuating gear, a stopper attached -to said second carriage, a 1division key mounted on said stopper, and a numeral key. 1

FIGURE 8 is an enlarged vertical sectional view of a bevel pinion, a pair of bevel gears, a carriage for said pair of bevel gears, an add-subtract key attached to said carriage, and a ratchet associated with said pair of bevel gears.

FIGURE 9 illustnates a lirst integral gear member of a numeral wheelon the right side thereof having twenty teeth operatively associated with a transfer gear.

FIGURE 10 illustrates a second integral gear member ofka numeral wheel on the left side thereof having two teeth operatively associated with a transfer gear.

FIGURE 11 illustrates two adjoining numeral wheels, a tens-digit wheel and a unit-digit wheel, operatively associated with a transfer gear.

FIGURE 12 is an enlarged vertical sectional front view ofa carriagey embodying la principal actuating gear attached with a pointer, a second carriage embodying a second actuating gear attached with a stopper and a ldivision key, and 'actuating mechanism associated therewith.

FIGURE 13 is a similar view of FIGURE 12 showing the division key depressed and the changed position of actuating mechanism associated therewith.

FIGURE ,14 is a vertical sectional side View of FIG- URE l2.

FIGURE l5 is a vertical sectional side View of FIG- URE 13.

FIGURE 16 is a plan view of -a substantially transparen-t multi-colored facia strip with a numerating key attached ythereto moved to the left, illustrating a numerating device which enables the numerals indicated on the numeral wheels viewed through said transparent facia strip appearing yalternately color-shaded and unshaded, readily recognizable as a number without a decimal fraction and respectively marked for billions, millions, thousands, and units. v v.

FIGURE 17 is a similar view .asLFIGUR'E 16 with the numerating key moved to the right showing said numerals to be a number with a decimal fraction and 4respectively marked for millions, thousands, units, and hundredths.

FIGURE 16A is fragmentary sectional view showing the mounting of the transparent facia strip on the supporting pins.

FIGURE 17A is fragmentary sectional view showing the mounting of the numeratin-g key on the transparent facia strip. g

Y FIGURE 18 is a vertical sectional view of a train of numeral wheels with two of said numeral wheels, one wheel indicating a and a second Wheel indicating a numeral 5, exploded to show the relative positions of the cam bushings associated therewith, land a clearance key.

FIGURE 19 is a similar view of `FIGURE 18 showing the clearance key depressed and the train ofnumeral wheels moved rightward with the numeral Awheel initially indicating a numeral now zeroised.

FIGURE 20 is a similar view of'FIGURES 18 and 19 showing the clearance key restored to normally raised position after release of depression of said clearance key and Ithe train of numeral Wheels returned to initial position with the entire train of numeral wheels all zeroised.

FIGURE 2l is an enlarged fragmentary view of the Y two exploded numeral wheels shown in FIGURE 18.

FIGURE 22 is an enlarged fragmentary view of the two exploded numeral wheels shown in FIGURE 19.

FIGURE 23 is Aan enlarged perspective View of a cam Y bushing for a numeral wheel.

FIGURE 24y is a vertical sectional view similarto 1IIGURES 3 land 4 illustrating the depression of a numeral FIGURE 25 is a vertical sectional'view similar to FIGURE 24 illustrating the release of depression of a numeral key.

While the invention is susceptible of various modifications andalternative constructions, I have shown in the drawings and will hereinafter describe in detail the preferred embodiment, but it is to be understood that I do not hereby intend to limit the invention to the specific form disclosed 'but intend to cover all modifications and alternative constructions falling within the spirit and scope of theinvention as expressed in the applied claims.

Referring to the drawings, the calculating machine of this invention in the preferred embodiment, as shown in FIGURE 1, ycomprises an outer case 30 in which is encased ian operative mechanism which is mounted on a frame work including supporting plates suitably secured together.

On the top side of said outer case 30 there are arranged a series of ten depressible numeral keys 45 marked 0 to and through 9 respectively. As shown in FIGURES 4, 6, and 7, each of said numeral keys 45 has a stem 46 extending downwardly into said outer case through a slot 50 in the top plate 31 and a second slot 51 in a supporting plate 170, slidable therethrough vertically with a pin 49 on said stern 46 near the lower end thereof and beneath said 1supporting plate 170 to limit the upward movement of said stem. Each tof said numeral keys 45 is provided with a spring 52 mounted near the lower end of the stem 46 of said numeral key between a pin 48 on said stem 46 and sa'id supporting plate 170 for maintaining said numeral key in a normally raised position and restoring said numeralkey to said raised position upon release of deis a projecting lug -47 (see FIGURES 6 and 7), adapted to drive a horizontal actuatingbar 12S to move in a longitudinal direction when said lug 47 slides into and in contact with the left edge `of a slanting slot 129 in said hori- Zjontal 'actuating bar 12S, upon depression of said numeral key 45.

On the top side of theV -outer case 30, there are also arranged an addsubtract key 53, a clearance key 56,-a shift key 62, a numerating key 42, a pointer 66, a stopper 68, and -a division key '70, ,all of which have stems extending downwardly into the outer case through slots in the top plate'31 provided therefor and suitably mounted, as described in detail hereinafter.

In the top plate 31, there is a plurality of Windows 34 through which numeral markings on the numeral wheels 74 are exposed to view. As shown in FIGURE 3, immediately lbeneath said windows 34 and above said numeral wheels 74 is a substantially transparent facia strip 35 mounted at the opposite 'ends thereof on two supporting pins 40 and 41 `on said top plate 31 extending through two slots 38 and 39 at the opposite ends of said transparent facia strip for longitudinal movement thereon movable by the numerating key `42 which has a stem 43 extending downwardly through a slot, 44 in the top plate 31 into the outer case and rigidly secured to said transparent facia strip 35, as shown in FIGURE 16, 16a, 17, and 17a. Said' transparent facia strip '35 is constructed of a plurality of colored sections V36 and 36a and colorless sections 37 arranged alternately so that the numerals marked on said numeral Vwheels 74 viewed therethrough appear to be color-shaded Iand unshaded respectively and accordingly Each of

said sections

36 and 37 has an area large enough to cover the area `of `three adjoining windows 34, whereas the leftmost section 36a thereofL has an area largeu enough to cover yan area of at least one Window in excess of the remaining windows 34, if any, uncoverable by the

other sections

36 and 37 thereof. The arrangement is such that when said transparent facia strip 35 is moved hundred twenty-live million, seven hundred ninety thousand, three hundred and seventy-nine. And when said transparent facia strip 35 is moved to the right by said numerating key 42, asshown in FIGURE 17, said exemplified vnumerals appear to have the numerals 2 1 color-shaded, the numerals 2 5-7 unshaded, theV `r numerals 9-0-3 color-shaded, and the numerals 7- 9 unshaded, readily recognizable as twenty-one million, two hundred fifty seven thousand, nine hundred and three, and seventy-ninehundredths. It is apparent that by moving said numerating key 42 to the left, a number will appear without a decimal fraction, and when said numerating key 42 is moved to the right, arnumber will appear with a decimal fraction. K v v v Y In FIGURE 2, there is shown a train of numeral wheels 74 which are mounted on a irst stationary spindle 81 on which said numeral wheels 74 are individually rotatable `and collectively movable longitudinally. Said stationary spindle 81 is Iixedly supported at the opposite ends there, of in apertures in supporting

plates

172 and 174. At the right end of said train of numeral wheels 74 is a compression coil spring 83I mounted on said stationary spindle 81, preventing said train of numeral wheels from longitudinal movement thereon in normal position without interfering with individual rotation of said numeral wheels, and restoring said train of numeral -wheels to said normal position after having been moved longitudinally to the right thereon. As shown in FIGURES 3, 18, 19, `and 20, at the left end of said tr-ain of numeral wheels74 is a cap type member -84 slidably mounted on the left end Y yof the clearance key '56, keeping said clearance key 56 in a normally raisedaposition and with its right end resting against the leftmost numeral wheel k74 of said train of numeral wheels.

Each of said numeral wheels 74 has on its peripheral flange markings of a sequence of ten numerals of to and through 9 (see FIGURE 2), on its right side a first integral gear member 75, and on its left Iside a second integral gear member 76'. Said first integral gear'members 75 has a plurality of teeth whose number equals to the number of the numeral markings on said numeral wheel 74, or a multiple thereof (see FIGURE 9), and said second integral gear member 76 has one tenth as many adjoining teeth las said first gear member 75 (see FIGURE l0).- Said first integral gear member 75 is adapted for actuation by a principal actuating gear 92 (see FIGURE 6), a lsecond actuating gear 105 (see FIGURE 7 and a transfer gear 8S (see FIGURES 6 and 7). Said second integral gear member 7 6 is adapted for actuation of said transfer gear 88. The teeth of both integral gear rnernlbers 75 and 76 protrude beyond the peripheral flange of said numeral wheel 74. To keep said numeral wheels 74 from wobbling on the stationary spindle `S1 when not rotating thereon, an idle spindle 86 (see FIGURES 6 and 7) is providedtherefor, said idle spindle 86 being mounted at the opposite ends thereof on yielding supports 87 and being in constant engagement rwith the integral gear members of said numeral wheels 7 4.

As shown in FIGURES 21 and 22, located inside the Ibore of each of the numeral 'wheels 74 and rigidly secured thereto is a cam bushing 78 which has a cam surface 79 -(see FIGURE 23) engageable by a pin `82 on the first stationary spindle '81 on 'which said numeral wheels 74 are mounted and which further has a slot l18() (see FIGURE 23), to accommodate said pin 82. Said pin 82 is located inside the bore of said numeral wheel 74 in a position not to interfere with the rotation thereof, nor to engage the cam surface 79 of said cam bushing 78 associated therewith when said numeral wheel 74 is indicating a zero and is moving longitudinally towards said pin S2, but to engage said cam surface 79 when said numeral wheel 74 is not indicating a zero and is moving longitudinally towards said pin v82. When said pin v82 is thus engaging the cam surface 79 `of the ca-rn .fbushing 78, it urges the numeral wheel 74 associated with said cam bushing 78 to rotate to a position indicating a Zero, which is attained when said pin 82 is lodged into the slot f8() of said cam bushing 78, as shown in FIGURE 22. j

'As shown in FIGURES 18, 19, and 20, theclearance key 56 has a stem 57 extending downwardly through a slot 60 in the top plate 31 and a second slot 61 in a 'supporting plate 177, sl-idable therethrough vertically with ,the upward movement thereof limited by a pin 59 thereon near the lower end thereof and beneath said supporting plate 177. The intermedi-ate portion of the right edge of said lstem 57 of said clearance key 56 is formed with -a cam surface 58, the undersideof which resting on the left end of -the capy member 84 to keep said clearance key 56 in a normally raised position. As shown in FIGURES 18 and 21, two of the numeral wheels 74, one numeral Iwheel 74 indicating a zero and ya second numeral wheel 74a indicating a numeral 5, are exploded to reveal the respective positions of the cam bushings 78 associated with said two numeral wheels, with the cam surface 79 of the cam bushing 78 associatedfwith the numeral wheel 74 indicating the zero rfacing upward and the cam surface 79:1.'of the cam'bushing 78a associated with thel numeral wheel 74a indicating the numeral 5 facing downward. Upon depressi-on of the clearance key 56, as shown in FIGURE 19, Ythe stem 57 |of said clearance key 56, urges, through its cam surface 58, said cap member 84 6 to move longitudinally rightward and said cap member 84 in turn pushes the entire train of numeral wheels 74 to move collectively likewise rightward, compressing the spring 83 at the right end thereof, during whichrightward movement, said numeral wheel 74a indicating the numeral 57 is urged to rotate to |a position indicating a zero by the pin 82a on the first stationary spindle 81 engaging the cam surface 79d of the cam bushing 78a of said numeral wheel 74a until said pin 82a is lodged in the slot 80a of said cam bushing 78a, while the numeral wheel 74 indicating the zero remains in zero position since the cam bushing 78 therein is n'ot lactuated by the pin 82 on `said stationary spindle 81 when in zero position, as shown in FIGURE 22.

Upon release of depression of said clearance key 56, as shown in FIGURE 20, the spring 813 at the right end of said train of numeral wheels 74 expands, urging said train of numeral wheels 74 'and the cap member 84 at the left end thereof to move longitudinally leftward lback to their initial :and normal position wit-h all of said numeral wheels 74 zeroised, meanwhile said cap member 84 engages the cam surface 58 of the stem 57 of said clearance key 56, displacing said stem 57 in an upward direction, thereby restoring said clearance key 56 to its normally raised position. As shown in FIGURE 3, a plurality of transfer gears 88 arerotatably mounted on a second stationary spindle p 90 which is parallel to the first stationary spindle 8-1 and i-s fixedly supported at the 'opposite ends thereof in apertures in supporting plates @172 and 17 4, said transfer gears 88 being kept 'apart one from another by spacers 89, and being kept from wobbling ion saidsecond stationary spindle when-not rotating thereon by an idle spindle 91 (see FIGURES 6 and 7) which is mounted at the opposite ends thereof on the yieldable supports y87 and is in constant engagement with said transfer gears 88. As shown in FIGURE 1l, each of said transfer gears 88 is operatively associated with the second integral gear member 76 of a numeral wheel 47b and the first integral gear member .'75 fof an adjacent numeral wheel '74a of neat higher order.

Said transfer gear 88 has the function of automatically increasing the value of a numeral wheel 74a by one when its adjacent numeral wheel 74h of next lower order shall have an accumulated value exceeding nine, and the function o-f automatically decreasing the value of a numeral wheel 74a by one when its adjacent numeral wheel 74h of next lower order shall have a residual value of less than zero. Said functions are illustrated in FIGURES 9, l0, and l1.

As shown in FIGURE l0, when a numeral wheel, such as the unit-digit wheel 74b, is indicating a numeral 9, tooth 76a of the second integral gear member 76 of said unit-digit wheel 74b is in engagement with tooth 88a of the transfer gear 88 at the one side thereof so thatwhen said unit-digit Wheel 7417 rotates yone-tenth of one revolution in the direction indicated by an arrow in full lines in said 'FIGURE l0 from its initial position indicating the numeral 9 to a `position indicating a zero (in dotted lines) as shown in FIGURES l0 and 11, its second integral gear rnember 76 rotates with said unit-digit wheel 7412 a distance of two tooth-spaces, moving the two teeth 76a and 76b thereof to a position indicated by 76a and 76h respectively (see FIGURE l0), and drives said transfer gear 88 to notate an equal distance of two tooth-spaces, moving its tooth 38a to a position indicated by 88h (see FIGURES 9 and l0), said transfer gear 88 in turn drives the first integral gear member 75 of the tensdigit wheel 74a an equal distance of two tooth-spaces, moving two of the teeth thereof,teeth 75a and 75h, to a position indicated by 75a' and 75b respectively (see FIGURE 9), and with said first integral gear member 75 said tens-digit wheel 74a rotates one-tenth of one revolution in the direction vindicated by an arrow in full lines (see FIGURE 9) from V74b of FIGURES 10 and 11, is indicating a zero (in dotted llines) tooth 76b (in dotted lines) of the second integral gear member 76 of said unit-digit wheel 7411 is lin engagement with the tooth 88a fof the transfer gear 88 on the opposite side thereof so that when said unit-digit wheel 74b rotates one-tenth of one revolution in the direction, indicated Iby a Vdotted arrow in said FIGURE 10, from its initial position indicating a zero (in dotted lines) to a posit-ion indicating a numeral 9 (in full lines), its second integral gear member 76 rotates with said unitdigit wheel 74b a distance of two tooth-spaces, moving said two teeth 76a and 76b to a position indicated by 76a and 76b respectively, Fand drives said transfer gear 88 to rotate an equal distance of two tooth-spaces moving the tooth 88a of said transfer gear 8'8 Ato a position indicated by 80C, ysaid transfer gear 88 in turn drives the rst integral gear member 75 of the tens-digit wheel 74a an equal distance of two toothV spaces, moving the teeth 75a and 75b sof said rst integral gear member 75 .to a position indicated by 75a and 75b respectively, as shown in FIG- URE 9, and with said iirst integral gear member 75 said Vtens-digit wheel 74a rotates one-tenth of one nevolution in the direction, indicated by a dotted arrow in FIGURE 9, from its initial position indicating the numeral 2 (in dotted lines) to a position indicating the numeral l (in full lines), resulting in a number 19 indicated on said two numeral wheels 74a and 74b, as shown inFIGURES 9, l0, and 1l. This illustrates the so-called borrowing device in a subtractive ope-ration.

As shown in vFIGURE 2, a principal actuating gear 92 having preferably nine teeth and being adapted to drive a numeral wheel 74 to rotate through the rst integral gearrnember 75 thereof with which said principal actuating gear 92 is in engagement, is mounted on Va first rotatable spindle 94 in which there is a key-way 95 extending longitudinally through the entire length thereof to accommodate a key 93 (see FIGURE 6) in the bore of said principal actuating gear 92 and enabling said principal actuating gear 92 to move longitudinally thereon and to revolve therewith. Said first rotatable spindle 94, being parallel to the iirst stationary spindle 01, is journalled at the opposite ends thereof in bearings in the supporting plates 172 and .179. As shown in FIGURES 12 and 13, a carriage 96 embodying said principal actuating gear '92 is mounted on said first rotatable spindle 94 and movable longitudinally thereon with said principal actuating gear 92. In an aperture 99 in the right side of the upper member 97 of said carriage 96 is secured a frictional cord 102 which extends rightward over the frictional surface of the peripheral flange of a spool 1155 (see FIGURES 2 and 3) which is ixedly mounted on a third rotatable spindle 157 which is perpendicular to said first rotatable spindle 94 and is journalled at the opposite ends thereof in bearings in the supporting plates 175 and 176, and returns, after passing over two guide-pulleys 103 and 104 at the left end of the machine (see FIG- URES 2 and 3), to an aperture 98 in the left side of the upper member 97 of said carriage 96 to be secured therein. Said carriage 96 has a left arm 100 extending leftwardly for actuation of a lever 121 associated with a second carriage 107 embodying a second actuating gear 105, as described hereinafter. Rigidly'secured to said carriage 96 is the stem 67 of the pointer 66 (see FIG- URE 12) which extends upwardly through a slot 32 in the top plate 3'1 to support said pointer 66 (see FIGURE l).y Said slot 32 extends longitudinally through said 8 f top plate '31 and is located between the windows 34 and the numeral keys 45 (see FIGURE 1). Said pointer 66 which moves longitudinally in and above said slot 32, has for purpose of pointing to a windowV 34 at which an operation of calculation is to be performed. A. plurality of notches 33` (see FIGURE l) are provided-in the one side of said slot 32 to holdl said pointer 66 and the stopper 68 properly stationed. Said stopper 68 has a stem 69 extending downwardly through said slot 312 y' (see FIGURES 12, 13, 14, and 15), and is manuallyV movable longitudinally in and above said slot 32 and settable in front of any one of said Windows 34 at which the leftward movement of said pointer 66 is to be arrested (see FIGURE 1).

As shown in FIGURE 2, a driven bevel pinion 154 is xedly mounted on the irst rotatable spindle 94 at the right end thereof and is adapted for actuation by either of a pair of driving bevel gears 144 and 145, each of said pair of bevel gears 144 and 145 having twice as many teeth as said bevel pinion 154. As shown in FIG- URE 8, said pair of bevel gears 144 and '145 are embodied in a third carriage 148 and are rigidly securedY together by a sleeve 146 in which there is a slot 147 through which. extends a pin 150i on a second rotatablel spindle 1'49 on which said pair of bevel gears 144 and V145 are mounted and movable transversely thereon and with which said pair of bevel gears 144 and 145 revolve. Said second rotatable spindle 149 is journalled at the opposite ends thereof in bearings in the supporting plates and i176 and is arranged perpendicularly to said irst rotatable spindle 94 on which said bevel pinion 1154 is fixedly mounted (FIGURE 2). Said pair of bevel gears 144 and 145 are movable forwardly and rearwardly on said second rotatable spindle I149 bythe addsubtract key `53 which has a stem V54 extending downwardly through a slot 55 in the top plate 311 and rigidly secured to said third carriage 148. When said add',- subtract key 153i is moved rearward to add position, the front bevel gear 144 as shown in dotted lines in FIGURE 8 comes into engagement with the bevel pinion 154 which can then be actuated thereby to rotate in one direction; and when said add-subtract key 53 is moved forward to subtract position, the rear bevel gear 145 controlled by the principal actuating gear 92 which rotates with the bevel pinion 1154, both of which being mounted on the first rotatablerspindle 94, a reversal of the rotational direction of said bevel pinion 154 reverses the rotational direction of said principal actuating gear 92 and hence the rotational direction of the numeral wheel 74 1n operative relation with said principal actuating gear. It is, therefore, apparent that when the add-subtract key 53 is moved to add position, a numeral wheel 74 in operative relation with the principal actuating gear 92 will rotate in the direction in which the value of the numeral indicated thereon is increasing, andy when said add-subtract key l5-3 is moved to fthe subtract position, said numeral wheel 74 will rotate in the reverse direction in which the value of the numeral indicated thereon is decreasing.

As shown in FIGURES 2., 5, and l8, a iirst ratchet 15'1,

having an equal number of teeth as the principal actuat ing gear 92, that is, nine teeth, is iixedly mounted on the second rotatable spindle 149 on which the pair of bevel gears 144 and 145 `are also mounted, and isprovided with a spring-pressed'pawl 152. (FIGURE 5), pivoted on a pin 153 for controlling said iirst ratchet 151 and said pair of bevel gears 144 and 145 to revolve -with said second rotatable spindle 149 in one direction only. Said rst ratchet 151 is adapted for actuation by a horizontal actuating Vrack 138 pivoted on a horizontal actuating bar 128 (see FIGURES), as explained hereinafter.

As shown in FIGURE 4, an elongated horizontal actuating bar 128i is seated in a plurality of yo'kes 133 which are secured to a supporting plate 170, and is mounted for longitudinal movement thereof on a plurality of pins 134 which are secured to said yokes 133 and which extend through a plurality of horizontal slots 130 in said horizontal actuating bar 128 in the lower portion thereof. At the Vleft end of said horizontal actuating bar 128, there is mounted inbetween an adapter 135 on said horizontal actuating bar and a second adapter 136 on the supporting plate 171 a compression spring 137 adapted to restore said horizontal actuating bar to normal position when said horizontal actuating bar has been moved leftward. Extending downwardly and angularly from the upper edge of said horizontal actuating bar 128 are ten inclined, or slanting, slots 129 which are engageable by the projecting lugs 47 on the stems 46 of the numeral keys 45. Said slanting slots 129 are disposed at varying angles such that upon `depression of a numeral key 45, the projecting lug 47 on the stem 46 of said key slides into and in Contact with the left `edge of a corresponding slanting slot I129, displacing said horizontal actuating bar 128 in a longitudinal direct-ion leftward to a distance predetermined by 4the angle of said lslanting slot 129, said horizontal actuating bar 1.28 thereby bringing a horizontal actuating krack 138 pivoted thereon at the right end thereof to move ka corresponding distance. As shown inl FIGURES 4 and 5, said horizontal actuating rack 138` is'pivote'd on a pin 131 on said horizontal actuating bar y12S at the right end thereo-fand is pro- `dicated by'151b.

vided with a spring 142 to keep said horizontal actuating rack`138l downwardly and yieldably upwardly. Said horizontal actuating rack 13S has ten ratchet-type teeth,

of which nine teeth 139 are inclined in one direction and one tooth 141, the Vrightmost tooth,'is inclined in the opposite direction thereof. Said nine teeth 139 are adapted 4for actuation of the first ratchet 151 in the forward, ory leftward, movement of said horizontal actuating rack 138 'and said rightmost tooth'141 is vadapted for actuation of a second ratchet 156 inthe return, or rightward, movement of said horizontal actuating rack 138.

At rest position, the leftmost tooth 140 of said nine teeth 139 is positioned one tooth-space away from the first engageable tooth 151a of the first ratchet 151 and the rightmost tooth 141 is positioned one tooth-space away from the first engageable tooth 156e of said second ratchet 156 on the unengageable side thereof. vSaid second ratchet 156, as shown inFIGURES 2 and `5, is xedly mounted on the third rotatable spindle 157 on which the spool 155 is also tixedly mounted and on which at the rear end thereof is mounted a torsion spring l158 (FIGURE 2) of which one free end is secured to said third rotatable spindle 157 and the other free end thereof secured to the supporting plate 176. `It is to be appreciated that by such an arrangement of the teeth of said horizontal actuating rack 138, said horizontal actuating rack I138` will actuate saidfrst ratchet 151 in the forward, or leftward, movement thereof only when said horizontal actuating rack 13,8 has moved a distance of more than one tooth-space and will actuate said second ratchet 156 in the return, or rightward, movement thereof irrespectiveof the distance which said horizontal actuating rack 138 might have moved forward.

As illustrated in FIGURE 24, upon depression of the exemplified numeral key marked 1, the projecting lug 47 of the stem 46 of said numeral key, on the downward movement of said ste-m, slides into a slot 1.29 in the horizontal actuating bar 128, compressing the spring y 52 at the lower end of said stern 46 and at the same time displacing said horizontal'actuating bar 128 in 1U a longitudinal direction leftward, compressing the spring 13'7 at the left end of said horizontal actuating bar 128, meanwhile, the horizontal actuating rack 138 pivoted at the right end of said horizontal actuating bar 128 isbeing moved leftward likewise by said horizontal actuating bar 128, movingpthe leftmost tooth 1411 thereon to a position indicated by l14Gb (see FIGURE 5), -a distance of two tooth-spaces,V and actuating the iirst ratchet 151 to revolve a distance of one tooth-space, moving the rst engageable tooth 151@ thereon to a position inlt will be noticed that if said depressed numeral key is key marked 0, said horizontal actuating rack 138-will move a distance of one toothspace, moving said leftmost tooth 140 to a position indicated by 140e, contacting the first engageable tooth 151ev of said iirst ratchet `151 without actuating said first ratchet'to revolve. When said first ratchet 151 revolves a distance of one tooth-space, that is, one ninth of one revolution, the pair of bevel gears 144 and 145 which are mounted on the same second rotatable spindle 149 on which said first ratchet 151 is ixedly mounted, also revolves one ninth of one revolution, and one of said pair of bevel gears 144 and 145 drives the bevel pinion 154 in engagement therewith to revolve two ninths of one revolution (said bevel gear having twice as many teeth as said bevel pinion as described herein before) in one direction or in the reverse direction thereof depending upon which gear of said pair of bevel gears 144 and being then in engagement with said bevel pinion 154. As the principal actuating gear 92 which is mounted on the first rotatable spindle 94 on which said bevel pinion 154 is xedly mounted, said principal actuating gear V92 likewise revolves an equal distance of two ninths of one revolution, that is, a distance of two tooth-spaces, lwhich said bevel pinion 154 has revolved, and drives the first integral Agear lmember 75 of a' numeral wheel 74 in engagement therewith to rotate a distance of two toothspaces, and with said rst integral gear member 75 said numeral wheel 74 rotates a distance of one tenth of one revolution and indicates thereon a number that is one more or one less than the number initially indicated thereon depending upon whether the operation is additive or subtractive. As shown in said FIGURE 24, the principal actuating gear 92 is in engagement with the first integral gear member 75 0f the second rightmost numeral wheel 74 which is assumed to be initially indicating a number 2. Upon depression ofthe numeral key 45 marked 1, said second rightmost numeral wheel will rotate to indicate thereon a number 3 which is one more than the number 2 initiallyindicated thereon, assuming this being an additive operation. On the other hand,'if it is a subtractive operation, it is obvious that upon depression of said numeral key marked 1, said second rightmost numeral wheel will indicate a number l which is one less than the number 2 initially indicated thereon. It, therefore, follows that upon depression of any one of said numeral keys `45, a numeral wheel 74 in operative relation therewith will rotate to indicate thereon a number that has been increased or decreased by the number marked on said depressed numeral key, depending upon whether it is an additive or subtractive operation.

Upon release of depression of any one of said numeral keys 45, for example, the numeral key 45 marked 1, las shown in FIGURE ,25, said depressed key is forced to move upwardly to its normally raised position by expansion of the spring 52l mounted on the lower end of the stem 46 of said numeral key, and the horizontal actuating bary 128 is forced to 4move back-ward, or rightward, by expansion of the spring 137 at the left end thereof, whereby the horizontal actuating rack 13S pivoted on said horizontal actuating bar 128 at the right end thereof likewise moves rightward whereupon the rightmost tooth 141 thereof drives the second ratchet 156 to revolve a distance of one tooth-space, moving the first engageable tooth 156e thereof to a position indicated by 156b (see 11 FIGURE 5), and with said second ratchet 156 the spool 155 which is xedly mounted on the third rotatable vspindle 157 on which said second ratchet 156 is also fixedly mounted, revolves and pulls, through the intermediation of the tfrictional cord y102, the carriage 96 and the principal actuating gear 92V embodied therein andthe pointer 66 attached thereto, rightward, :from their initial position A (FIGURE 25) in operative relation with said second rightmost numeral wheel to a second position B in operative relation with the rightmost numeral wheel for actuation by a subsequent depression of `any one of said numeral keys 45, and at the same time moving the pointer 66 from the second rightmost window to the rightmost window as indicated by 66a and 6611 respectively in FIGURE 1. v

In the case of said numeral key 45 marked l being initially in operative relation with the numenal wheel 74 of the lowest order, that is, when the principal actuating gear 92 is in operative relation with the rightmost numeral wheel 74, as shown by position B in 4FIGURE 25, upon release of depression of said numeral key marked 1, the carriage |96, the principal actuating gear `9-2, and the pointer 66 are rstly pulled rightward to a position C by the spool 155 which has revolved upon actuation of the second ratchet 156 associated therewith by the rightmost tooth 1141 of the horizontal actuating rack 138 in the return, or rightward, movement. thereof, as explained hereinbefore, whereupon said carriage 96 strikes a horizontal bar 166 (FIGURE 5), said horizontal bar '.166 being operatively connected at the right end thereof to the lower end of a lever y159 by a pin 167 on said horizontal bar 166 extending through a slot 116-1 on said lever 159 at the lower end thereof, and being supported at the left end thereof by a pin 169 on a supporting plate 180 (FIG- 'U RE 2), and being therebyY movable longitudinally. Said lever 159 is pivoted on a rod1-165 secured to the supporting plate 175 and has an ear 160 on the right edge thereof in constant engagementwith the second ratchet v156, permitting said second ratchet andthe spool l155, both being iixedly mounted on the third rotatable spindle 157, to revolve in one direction when thus engaged, and permitting said second ratchet 1156- and said spool 155 to revolve in .fthe reverse direction thereof when disengaged therewith, and further hasta leftwardly extending arm 162 pivotally connected to the stem 63 of the shift key 62 by a pin 64 on said stem 63 through a slot l163 on said left arm 162 of said lever i159, said stem 63 of said shift key 62 extending upvvardly through a slot 65 in the top plate 3.1 to support said shift key 62. The upper end 159a of said lever 159 is contiguous to a dog I143 on the horizontal actuating rack 138 latchable by said dog 143 when the top portion of said lever 1159 pivots to the left. Upon the rightward movement of said carriage `96, said horizontal bar 166 is struck and thereby causes the top portion of said lever '1159v to pivot leftward, whereupon the ear 160 of said lever 159 disengages said second ratchet 156 (FIGURE 5), permitting ythe third rotatable spindle 157, on which both said second ratchet :156 and the spool [1.55 are fixedly mounted, to rotate in the reverse direction thereof by actuation of the spring 1158 associated with said third rotatable spindle 157 at the rear end thereof, and With said third rotatable spindle 157 said spool |155 revolves in the same reverse direction and pulls, through the intermediation of the frictional cord 1012, said carriage 96, said principal actuating gear 92, and said pointer 66 all the way leftward until stopped by the stopper 68, bringing said principal actuating gear 92 to a numeral wheel 74 of higher order to be in operative relation therewith and bringing saidpointer 66 to a window 34 under which is said numeral vwheel of higher order. As shown in FIG- URE 25, upon release of depression of the numeral key V45 marked l the carriage 96, the principal actuating gear 92 and the pointer 66 are firstly moved rightward from the initial position B to a second position KC and thence are moved leftward to a third and final position D. As shown in FIGURE 1, the pointer 66 is moved Y initial position, thereby keeping said second ratchet '156 continually disengaged |with the ear |160 of said lever 159 until said lever i159 is permitted to pivot back to its initial position restored thereto by a spring 164 thereon when said dog 143 on said horizontal actuating bar 138 unla-tches the upper end 159a of said lever `159 in the leftward movement of said horizontal actuating rack 138 upon a subsequent depression of a numeral key 45, whereupon said ear 160 of said lever 1159 again engages said second ratchet 156. This disengagement of said second ratchet 156 with said ear f160 of said lever 159 can also be effected by depression of the shift key 62, said depression of said shift key S62 actuates said lever `159 to pivot in the manner as just described.

A mechanism for automatic registration of the quotient in division on the numeral wheels 74 is illustrated in FIG- URIES V12, 13, 14, and 15. Said mechanism comprises a second actuating gear having an equal number of teeth as the principal actuating gear 92, that is, nine teeth, and being adapted to drive a numeral wheel 74 through the first integral gear member 75 thereof to rotate one tenth of one revolution and to accumulate thereon a numerical value of one upon each actuation thereof by said secondV able spindle 94 and movable longitudinally thereon.

`Said vertical actuating rack i117 having two teeth 118 (FIGURES 14 and 15) made of exible material, is mounted for ventical movement thereof at the lower end thereof in an aperture i in the lower member `109` of said second carriage 107 and is supported and guided at the upper end thereof by a grooved bearing plate 116 secured to the right member 1111 of said second carriage 1017, and is provided with a compression coil spring 120 mounted at cthe lower end thereof to keep said vertical actuating rack 1517 in a normally raised position and to restore said vertical actuating rack i117 to said normally raised position when said vertical actuating rack '.117 hasV been depressed. Said vertical actuating rack 117 is adapted to drive the ratchet hub 106 of said second actu-v ating gear 105 to rotate la distance of two tooth-spaces upon being actuated by a lever 121. Said lever 121 comprising a horizontal uppermember 122 and a vertical member 124 is slidably and pivotally connected atthe lower end of said vertical member 124 to an extending arm .'113 on the right edge of the right member i111 of said second carriage `1017 by a pin 114 on said armV 1.13 extending through a slot .1125 in said vertical member 124 at the lower end thereof, and is operatively connected to the stem 71 of a division key 70 by a pin 72on said stem 71 extending through a curved slot 123 in said horizontal upper member 122 of said lever i121. Said vertical member i12-4Y of said lever 11.21 has on the right edge thereof an ear 1.26 which is normally out of the path of the leftward movement of the left arm 100 of the carriage 96 associated with the principal actuating gear 92 and i114 on said arm I1113 extending through a slot 73 insaid stem 71 of said division key 70, said slot 73 coinciding with the slot 125i in the vertical kmember |124 of said lever 121. Said lever 121 is provided with a spring 127 for restoring said lever 121 to its initial position `after pivoting thereof. As shown in FIGURE 13, upon depressionof said division key 70, said lever 121 is lowered whereby the ear 1.26 thereof comes into the path of and becomesengageable by theleft arm 100l of the carriage 96 Yassociated with the principal actuating gear l92 in the leftward movement of`said carriage 96. When said left arm 410|) of said carriage 96 strikes said ear 126 of said lever 121, said lever 121 pivots whereupon the upper horizontal member 122 of said lever .121 contacts the upper end 119 of the vertical actuating rack 117 and pushes said vertical actuating rack 117 to move downwardly and to drive, with the two teeth 1'18 thereon, the ratchet hub 106 of said second actuating gear I105 to rotate a distance of two tooth-spaces, whereby said second actuating gear 105 rotates with said ratchet hub 106 thereof an equal distance of two toothspaces and drives the rst integral gear member 75 of a numeral wheel 74 in engagement therewith to rotate an equal distance of two tooth-spaces, and with said first integral gear member 75 sad'numenal wheel 74 rotates one tenth of one revolution and accumulates thereon a numerical value of one. In the rightward movement of said carriage 96 in a subsequent operation, said lever 121 is forced by the spring `127 thereon to pivot back to its initial position, withdrawing the upper horizontal member 122 .thereof from pressing against the upper end 119 of said vertical actuating rack 117 which is thereby forced to move upwardly to its normally raised` position by expansion of `the spring `lztyassociated therewith which has been vcompressed in the downward movement thereof. In said upward movement of said vertical actuating rack 117, the two teeth 1118 thereon, being of'flexible nature, yield and slip over the engageable tooth of said ratchet hub e106 without actuating said AratchetAh-ub.

In an operation of division, for examplei to divide a number, dividend, 5,634 by another number, divisor, 27, it is proceeded as follows.

iFirstly, Zeroise, or clear, all numerals appearing in the windows 34 by depression of the clearance key 56. The stopper 68 and the pointer 66 are setat the third leftmost window 134, which is for purpose of providing-the leftmost Window 64 to accommodate the irst signicant figure of the quotient andto leave at least one blank window 34 lseparating the last significant iigure of the quotient from the first significant 4figure "of an undivided resid-ual dividend, if any. Move the add-subtract key 53 to add position. The dividend 5,634 isentered by successive depressions of the numeral keys 45 respectivehl marked 5, 6, 3, and 4 corresponding to said dividend 5,634, af-ter which depress the shift key 62 to bring the pointer 66 back to the starting window, that is, the third leftmost window. 'Move the add-subtract key '5-3 to subtract positionand depress the division key 70. The depression of said division key 'l0y lowers the lever 1 21 and its ear 125 into the path of and to be engageable by the .if the divisor is largerthan the partial dividend, the stopper 68 andthe pointer 66 are to' be moved to a next Windowkon therightside thereof before'starting the operation of dividing.

To proceed with dividing, the divisor 27 is entered V by .successive depressions of numeral keys 45 respectively marked 2 land 7 'corresponding :to said divisor 27,

said pointer is secu-red, moves leftward. Near and at the end-of said leitward movement of said carriage 96, the lleftarm thereof strikes the

ear

1,26 or the lever i121, whereupon said lever |121 pivots leftward whereby the upperrnember `122 of sai-d lever 121 pushes the ventieal actuating mack 117 downwardly to drive the ratchet hub -106 lof .the second actuating gear 105 `to rotate a distance of two |t0.orth-spaoes, whereupon said second actuating gear rotates with its ratchet hub 106 an equal dismance ,of two too -spaces and drives the first integral gear member 75 lof the leftmost numeral wheel 74 tot rotate an equal distance of tvwo tooth-spaces, and with said first integral `gear member 75 said leftmost numenal wheel 74 rotates one-tenth .orf tone revolution and registers there- .on a numeral l which appears in .the leftmost window 34 and which is the quotient of one dividing. Meanwhile, the numerals 5 land 6 respectively :appearing in the third land `fourth leftmost windows have been changed into

numerals

2 and 9 respectively, indicating la nurnber 29 which is still langer .than the divisor 27, therefore the entry of said divisor is to be repeated in the same manner las just described, whereupon the numeral "l lappearing in the leftmost window is changed into a numeral 2 land the numerals 2 land 9 appearing in the third and fourth leftmost windows respectively are changed into numerals 0 and "2 respectively, indicatling la number 2 which is smaller than the divisor 27 and cannot be divided. The stopper 68 and the pointer 66 rare then moved to ta next wind-ow 34, that is, the fourth lefltrrrost window. As Ithe numerals 'appearing in the lfourth lan-d ith leftmost windows are 2 and 3 respectively, indicating a number 23 which is still smaller than the divisor 27 and cannot be divided, the stop-per 68 and the pointer 66 are further moved to a nent window, that is, the `fth leftmost window, whereupon the divisor 27 is repeatedly entered for eight times. Alfter the eighth entry of said divisor 27, there appear in theleftmost window and its -ii-ve adjoining Windows six

nurnenals

2, 0, 8, 0, 1, and 8 respectively, clearly indicating a quotient 1ct 2018 rand lan undivided residual dividend of 18, Iwith the stopper pointing to the fifth window.

Openations of Iaddition land subtraction are simplicity itself.

For example: to add two numbersl 2.50 and "65 together. Firstly, depress the clearance key 56 to zeroise, or clear, all numerals :appear-ing i-n the windows 34. Set the stopper 68 land the pointer 66 at the hundreds-digit window. Move the "add-subtract key 53 to add position. Depress successively the numeral keys 45 respectively marked 2, 5, and 0; corresponding to the rst number 250, whereupon there Iappear in the hundredsdigit, tens-digit, and unit-digit windows the

numerals

2, 5, [and "0 Irespectively. Upon depression of the numeral'key marked "'2, la numeral 2 :appears in the hundreds-digit window and upon release of depression of said numenal key marked 2, the pointer 66 automatically moves to the tens-digit window. Similarly, upon the depression :and the release of depression of the numeral key marked 5, 5 appears in the teus-digit window and the pointer 66 automatically moves to the unit-.digit window. Upon depression of the numeral key marked 0, 0 appearing in the unit-.digit window remains unchanged, and upon release of Idepress-ion of said numeral key marked 0, the pointer 66 automatically moves to the hundreds-digit Window, so that the er1-tryv of the second number 65 can be made in the same manner as the entry lof the `first number. As the rst figure of said second number 65 fis a tens-digit, the entry o-f said sectens-digit window is chan-ged into 1 land at the same time the numeral "2 appearing rat the hundreds-digit window is changed into 3 by the function ofthe carrying mechanism of the machine. When the numeral key marked 5 is depressed, the zero appearing in the unitdigit window is changed into 5, resulting in three numerals 3, 1, and "5 appearing respectively in the hundreds-digit, tens-digit, and unit-digit windows, indicating a number 3&5 which is the total of addition 'of said ftwo numbers.

Subtraction is operated in the similiar manner as addition with the except-ion that beiiore subtracting, the addsubtract key 53 is to be moved to subtract position. For example: to subtract la num-ber, sub-itrahend, 365 from another number, minuend, 615. The minnend 615 is iirstly entered in the same manner :as lad-dition with the add-subtract key 53 moved to add position. Atter fthe entry of said minuend "615, the add-subtract key -53 is moved to subtract position, and then the subtnahend 365 is entered in the same manner as addition. After completion of the entry of said subtnahend 365, there appear, in the windows of hundreds-digit, tens-digit, land unit-digit three

numerals

2, 5, and 0, respectively, indicating la number 25 01 which is the answer lof said subtraction. vIt will be noticed that upon .depression ou? the numeral key marked 6 :for the tensdigit 6 of said subtrahend 365, the numeral 1l appearing in the tens-digit Awindow is changed into "5 :and at the same time the numeral 3 appearing in the hunly to said numeral wheels for actuation thereof; a transporter means -for transporting said principal actuator from dreds-.digit window latter depression of the numeral key marked 3 for the hundreds-digit "3 of said subtraihend "365 is changed into Z by the functioning of the borrowing mechanism of the machine.

Multiplication, which is la process of repeated addition, is operated in the following manner.` For example: to multiply a number, multiplicand, "56 by another number, multiplier, 32. Firstly, zeroise, or clear, all numerals in the 'windows 34 by depression of the clearance key 56. Move the add-subtract key 53 to add position. Set the stopper 68 land the pointer "66 at the hundredsdigit window. Enter the multiplicand 5 6 in the same manner as acl-dition by successive depressions of the nnmeral keys respectively marked 5, 6, and 0 three times corresponding to the tens-digit 3 of said -`multiplier 32 whereupon :there [appear in the windows 34 of thousands-digit, Ihundreds-digit, tens-digit, and unitdigit the

numerals

1, 6, 8, and 0 respectively. rIlhe stopper 68 and fthe pointer 66 lare then moved to the tens-digit window, and the multiplicand "56 is again entered by successive depressions of the numeral keys respectively marked 5 and 6 repeated .two times corresponding to the unit-.digit "2 of said multiplier 312, whereupon there appear in the windows of thousandsdigit, hundreds-digit, tens-digit, and unit-digit the numenals of 1, 7, 9, and 2 respectively, indicating a number 1,792 Ywhich is the product olf the multipli- .cation of said two numbers.

What is claimed is:

1. In `a ten-key keyboard calculating machine havinga v register comprising a plurality of demoninational orders of numeral 4wheels ,and a keyboard of ten selectively depressible keys, each identifiable from the other by an indic'ium thereon of one of a sequence of ten digits of lfrom zeroto nine, both inclusive, in combination, a rotary shaft means, .a principal actuator mounted on the shaft for movement thereon and to rotate therewith, detachable coupling means to couple said principal actuator selectivenumeral wheels to be rotated to zero position by co-openalease means to be engaged by the principal actuator Aaftery actuationl of the last numeral wheel to release said spring means for transporting said principal `actuator from the position in engagement with the numeral wheel ofthe lowest denominational order-back to its starting position;

a member actuatable by said keys and movable by the f respective keys in differing amounts; and motion modifying means to convert movement of the member in the one directionr into a rotary motion of said rotary shaft means.

2. In the calculating machine as set forth in claim l, means for registering quotient of division on said numeral wheels including a secondary actuator rotatably mounted on said rotary Ishaft means and adapted for actuation of a numeral wheel in engagement therewith upon actuation thereof by said principal actuator in its return movement; means for movingsaid secondary lactuator into and out of engagement with numeral wheel; and means vfor rendering said secondary actuator actuatable by said principal actuator, said secondary actuator being normally not actua-table by said principal actuator.

3. In va calculating machine, incombination, asupport; a register comprising a train of numeral wheels mounted on the support, each of said numeral wheels having a cam bush-ing, said numeral wheels being individually rotatable and collectively movable axially on said` support; a

kplurality of projections on said support, each of said projections being operatively associated with cam bushing of each of said numeral wheels; spring means operatively associated with said train of numeral wheels at the one end thereof `and a depressible key operatively associated therewith at the opposite end thereof, whereby upon depression of said key said train of numeral wheels is collectively moved axially on said support in the one' direction,

whereby -all of said numeral wheels are rotated to zero,

position by `co-operation of the cam Ibushings of said numeral wheels with the projections on said support associated therewith respectively, rland whereby upon subsequent release of said key, said train of numeral wheels is restored to its normal position-by said spring means with said numeral wheels rotated to zero position.

4. In a calculating machine, in combination, a support having a plurality of projections; a register comprising `a train of numeral wheels rotatably mounted on the support; means fto mount the support for movement axially withr respect to said train `of numeral wheels; cam bushings carried by the respective numeral wheels fand respectively said projections on the support; a spring means -to engage with said support at the one end thereof; a depressible key Ito engage the opposite end thereof, whereby upon depression of said key, said support is moved -axially in the one direction relative to lthe numeral Wheels to cause the thereon, -a lcam bushing associated with each lof said nu? meral wheels, a plurality of pin-type projections on said supporting means, one of said pin-type projections being 'A i operatively lassociated with each of the cam bushings of said numeral wheels, a spring means operatively asso-- 17 ciated with said train of numeral wheels at the one end thereof and a depressibie key operatively associated With said train fof numeral Wheels lat lthe opposite end thereof, whereby upon depression of said depressib-le key said train :of numeral Wheels is collectively moved in ione direetion longitudinally whereupon all those of said numenal Wheels that are not indicating Zero are rotated byV cio-operation of the `cam bushings of said numeral wheel-s with their respective pin-type projections on said supporting -means to position indicating zero, and upon release of depression of said depressible key said train of numeral Wheels is restored to its initial position by said spring means with the entire train of said numeral Wheels zeroised. v

UNITED STATES PATENTS Richardson etal June 2, 1891 Wurzburg et al Now. 22, 1892 Lanier Ilan. 8, 1918 Tillman Oot. 25, 1921 Locke et al. Feb. 1, 1938 De Valle-Arizpe Nov. 20, 1951 Dustin Feb. 22, 1955 Koch May 20, 1958 Reeves Apr. 14, 19'59 Gross Apr. 26, 1960 Hever Olot. 10, 1961

Claims

1. IN A TEN-KEY KEYBOARD CALCULATING MACHINE HAVING A REGISTER COMPRISING A PLURALITY OF DEMONINATIONAL ORDERS OF NUMERAL WHEELS AND A KEYBOARD OF TEN SELECTIVELY DEPRESSIBLE KEYS, EACH IDENTIFIABLE FROM THE OTHER BY AN INDICIUM THEREON OF ONE OF A SEQUENCE OF TEN DIGITS OF FROM ZERO TO NINE, BOTH INCLUSIVE, IN COMBINATION, A ROTARY SHAFT MEANS, A PRINCIPAL ACTUATOR MOUNTED ON THE SHAFT FOR MOVEMENT THEREON AND TO ROTATE THEREWITH, DETACHABLE COUPLING MEANS TO COUPLE SAID PRINCIPAL ACTUATOR SELECTIVELY TO SAID NUMERAL WHEELS FOR ACTUATION THEREOF; A TRANSPORTER MEANS FOR TRANSPORTING SAID PRINCIPAL ACTUATOR FROM THE ONE POSITION THEREOF IN ENGAGEMENT WITH ONE OF SAID NUMERAL WHEELS AXIALLY TO ANOTHER POSITION IN ENGAGEMENT WITH A SUCCEEDING NUMERAL WHEEL OF NEXT LOWER DENOMINATIONAL ORDER IN SUCCESSION IN DESCENDING DENOMINATIONAL ORDER; SPRING MEANS RESPONSIVE TO MOTION OF THE PRINCIPAL ACTUATOR IN THE DESCENDING DIRECTION TO STORE ENERGY; RELEASE MEANS TO BE ENGAGED BY THE PRINCIPAL ACTUATOR AFTER ACTUATION OF THE LAST NUMERAL WHEEL TO RELEASE SAID SPRING MEANS FOR TRANSPORTING SAID PRINCIPAL ACTUATOR FROM THE POSITION IN ENGAGEMENT WITH THE NUMERAL WHEEL OF THE LOWEST DENOMINATIONAL ORDER BACK TO ITS STARTING POSITION; A MEMBER ACTUATABLE BY SAID KEYS AND MOVABLE BY THE RESPECTIVE KEYS IN DIFFERING AMOUNTS; AND MOTION MODIFYING MEANS TO CONVERT MOVEMENT OF THE MEMBER IN THE ONE DIRECTION INTO A ROTARY MOTION OF SAID ROTARY SHAFT MEANS.