US2195267A - Calculating machine - Google Patents

Description

March 26,1940. E. s. BUSH 2,195,2 7

CALCULATING MACHINE Filed Feb. 6,1936 Y 7 Sheets-Sheet 1' fa '4 1" n25 MW u INVENTOR [ass/vs S BUSH A-rw-onmay March'26, 1940.

E. S. BUSH CALCULATING MACHINE Filed Feb. 6, 1936 7' Sheetg-Sheet 2 INVENTOR. EUGENE 5. B USH ATTORNEY.

. g mi V m w w March 26, 1940. E. s. BUSH CALCULATING DIACHIfiE 7 Sheets-Sheet 3 Filed Feb. 6, 1936 INVENTOR. [005m- 5. Bus

ATTORNEY.

7 Sheets-Sheet E. s. BUSH CALCULATING IACHINE Fil'ed Feb. e. was

NMFbMm kQ March 26, 1940.

INVENTOR. [l/GENE 5 Bus/4 ATTORNEY.

Maach 26, 1940. E. s. BUSH CALCULATING MACHINE Filed Feb. 6, 19:56

7 Sheets-$13k): 5

, INVENTOR EUGENE 5. BUSH ATTORNEY March 26, 1940. El s. BUSH 2,195,267

CALCULATING MACHINE Filed Feb. 6, 193a Fishnets-sheet s INvENToR EUGENE 6i ,BusH

BY ATTORNj March 26, 1940.

' V E. s. BUSH CALCULATING MACHINE Filed Eeb. 6. 1936 7 Sheets-Sheet 7 R O T H E v N I Patenteiglvlar. 26, 1940 UNITED STATES CALCULATING mcmun Eugene S. Bush, St. Louis, Mo., assignor to Bush Manufacturing Company, St. Louis, Mo., a corporation of Missouri Application February 6, 1936, Serial Ni; 62,598

11 Claims.

This invention relates to improvements in calculating machines, and more particularly to machines pertaining to and for use in the mathematical arts, and which are electrically or elec- 5 tro-mechanically operated.

A general object of the invention is attained in an improved and simplified agency for translating the movement of selecting keys or the like, to the totalling mechanism as such, this translating means consisting of an improved electro-mechanical device and a novel combination thereof with the keys and totalling mechanism of calculating machines.

A further object of the invention is attained in the simplification of the mechanism functionally connecting the keys andtotalling apparatus, so as to require a minimum number of parts; to decrease the noise of operation heretofore attending the operation of calculating machines;

to improve the key touch and to minimize the effort incident to key placement in connection with selecting operations. In utilizing the term key" it is here intended to include any member presented to the operator for facultative manipulation in order to-eifect the totalling or other mathematical result.

More specifically stated in reference to the embodiment of the invention selected for disclosure, the invention has an object an improved use and application of electro-magnetic units or solenoids, for translating the key movements to the totalling, accumulating or other calculating mechanism as such.

In connection with the foregoing, it is an additional object of the invention to control the operation of the counting or calculating devices by means of solenoids, and to control the action of the solenoids in sequence by means of a master switch, which may itself be solenoid operated.

In connection with the foregoing, yet another object of the invention is so to construct a calculating machine, that the movement of an armature associated with each of the solenoids of one group or class, can be controlled at will by the operator of the machine; otherwise expressed, this object is attained in a preselection by the operator of the distance of armature to machines relating to the several mathematical arts, for example, such machines as those for adding, subtracting, multiplying, dividing, as well as computing, counting, and bookkeeping machines. Since many or most of the machines of this general class consist essentially of, or necessarily embody apparatus for both adding and substracting, and since predominantly the multiplying and dividing machines consist in essence of adding and subtracting mechanism, the invention is for brevity, described by making reference to'a small type of apparatus intended primarily for adding and subtracting operations.

The foregoing and numerous'other objects will be apparent from the following detailed description of the embodiment selected for purposes of disclosure, and my making reference to the accompanying drawings, in which:

Fig. 1 is a top or plan view of an adding and subtracting machine embodying the invention; Fig. 2 is an enlarged fragmentary view, showing certain parts in section, of the master or control mechanism made use of in the operation of my device, the location of Fig. 2 being identified by line 22 of Fig. 9; Fig. 3 is an enlarged section of the master control switch as viewed along line 3-3 of Fig. 2; Fig. 4 is a vertical longitudinal section of the forward portion of the device, showing one of the secondary solenoids together with its preselecting mechanism; Fig. 5 'is an enlarged fragmentary longitudinal section of the forward portion of the device, and showing particularly certain of the preselecting and clearing elements; Fig. 6 is an enlarged fragmentary view of one of the preselecting buttons in operative position; Fig. 7 is a sectional elevation taken on line 'l-'l of Fig. 6, and showingcertain details of the construction of one of the preselecting switches; Fig. 8 is a section along line 8-8 of Fig. 6 and showing a preferred arrangement for retaining or holding one of the preselecting keys in operative position; Fig. 9 is an enlarged vertical transverse section of the device, taken along line 9-9 of Fig. 4; Fig. 10 is a fragmentary transverse section along line Ill-i0 of Fig. 5; Fig. 11 is a fragmentary transverse section along line il--li of Fig. 5; Fig. 12 is a section of the device along line l2--l2 of Fig. 5; Fig. 13 is a fragmentary section along line |3l3 of Fig. 5; Fig.14 is a fragmentary section along line ll-il of Fig. 5; Fig. 15 is a fragmentary top or plan view of one of the secondary solenoid circuit breakers; Fig. 16 is a side elevation of the structure appearing in Fig. 15; Fig. 17 is a transverse section of the same mechanism, as viewed along line Il-ll of Fig. 16;

portion of the casing in horizontal section; Fig.

19 is a vertical section taken on theline lO-ll of Fig. 18; Fig. 20 is an enlarged vertical section of one of the calculating or counter units together with certain of its operating elements, all

as viewed along line 20-20 of Fig. 19; Fig. 21 is an enlarged fragmentary vertical section of one of the calculating units and associated wheel or disc, and showing certain of the elements provided for resetting the device to a starting point after completion of a mathematical operation; Fig. 22 is a vertical sectional elevation as viewed along line 22-22 of Fig. 21; Fig. 23 is a vertical elevation showing certain parts in section and as viewed along line 23-23 of Fig. 21; Fig. 24 is a horizontal elevation showing certain parts in section and as taken along line 24-24 of Fig. 21, and Fig. 25 is a diagrammatic representation of the various electromagnetic units or solenoids, together with the assocated switches and electrical conductors, and representing a preferred circuit relation or wiring diagram of the parts illustrated, when utilized with the mechanism illustrated by the preceding figures.

Referring now by characters of reference to the drawings, there is shown a casing I, provided with a top or cover 2, a bottom designated at 3, side walls 4 and 5, and end walls which may be designated as front and rear walls respectively, and indicated by numerals 6 and 1. The top 2 is provided with a relatively raised area equipped near one of its ends with windows or apertures designated in order at 9A, 9B, 8C, 9D and 8E, these apertures being spaced laterally of the top (Fig. 1). Further carried by the top 2 of the casing are a plurality of rows of buttons or keys designated in order as A, B, C, D and E, the several rows of keys being spaced laterally of the top,- and each row extending longitudinally thereof.

One of the buttons or keys in each row, for example at one end of the row, is designated by a suitable legend such as the letter C, designating it as a clearance button for that row. The remaining buttons or keys are shown as provided with legends, in the present instance numerals in sequence from 1 to 9, both inclusive as shown, or may bear other insignia as may be required for the particular work to which the machine is adapted. In addition to the keys or buttons discussed, the top 2 also carries a key, bearing, for example, the letter G, and which in the example shown is used for general clearance, or clearing the machine as a whole. An additional button bearing the letter R is utilized in a manner corresponding to the usual repeating key characterizing existing adding or calculating machines. The detailed function and operation of these buttons will be hereinafter described.

There is also carried by the top an elongated key or bar K, which serves to operate a switch through which for certain modes of usage hereinafter referred to, electric current is supplied to the electrical and electromagnetic units hereinafter referred to in detail. Parallel to one of the sides of the casing and carried by the top 2, is a bar M which extends longitudinally of the casing and serves to operate a master control switch for placing the machine in operation, all as hereinafter more fully described. It will be understood that in accordance with the present disclosure, each of the several keys, buttons and bars, is adapted for movement toward and from the top of the casing, or otherwise expressed, is adapted for an approximately vertical recipro catory actuation, each of the keys and bars being returned to upward or inoperative position, and normally held away from the top 2 as by means of a suitable spring. Each of the numberbearing keys in the several rows A,'B, C, D and E is provided with a shank or stem I I, preferably formed of insulating material, and which serves to position the associated'spring i0, surrounding the stern, it further appealing that each of the key stems extends into the casing through a suitable aperture therefor in the top or cover, 2.

Each of the numeral-key stems here in discussion, is provided with a slot l2 (Figs. 5, 6, 7 and 9) through which there extends a clearance rod, there being one such rod for each row of buttons or keys, these rods being numbered A, IJB, IIC, ISD and "E, the letter suflixes corresponding with the letter designation of the associated row of keys or buttons. It will further appear that each of the key stems is provided with a pair of spaced projections or teeth ll, one of which is located' on each side of the slot, these teeth projecting forwardly or in a direction toward the operator, and each being characterized by an inclined lower edge and a horizontal top or upperedge, so that when the key or button is depressed, the inclined edge will engage an adjacent pin or projection ii. A number of such elements I5 are carried by each of the clearance rods, to correspond to the number of keys associated with the rod. In the example of the disclosure there are nine such keys per row, although it will be understood that this number may be varied to meet difierent requirements.

Associated with each of the rods IIA, "B, "C, MD and IIE, is a spring l6 by which the rod is held in operative position as shown by Fig. 5. Due to the biasing effect of the spring it, it re-- suits that when a key is depressed, the inclined edge of the tooth or projection 14 carried by the stem H by which the depressed button is carried, will contact with an adjacent projection II and move that particular clearance rod in a forward direction until the stem Ii has been depressed suiilciently to bring the horizontal portion of the tooth below the projection l5. At this time the associated spring l6 will retract the rod, causing the pin ii to ride onto the horizontal edge of the tooth and to retain the button in depressed position as is clearly shown by Fig. 6. For purposes of returning the keys C, each is provided with a spring carried by its stem II, the spring being designated at H. The lower end of the key stem is bifurcated in form. so as to .straddle the clearing rod associated with the corresponding row of keys, and further provided with teeth is which contact and coact with projections 20 carried by the associated clearing rod. The latter teeth are somewhat longer than the teeth l4, so that when therow-clearing key C is depressed, it will act to displace the rod longitudinally, in a direction forwardly of the machine, and will release any numeral key in the corresponding row which has been locked in depressed position. The tooth or projection I4 is of such a length that when the key C is fully depressed, its horizontal portion will not pass under the projection 20, but upon release of pressure on the key, both the key and rod return to their original or starting positions.

Provision is made for slidably mounting the rods "A, IIB, C, "D and IIE, by suitable 1| brackets 2| (Fig. 5) dependingly carried by the top portion or cover 2 of the casing. Each of these rods has its forward end bent at a right angle as indicated by the numeral 22, these ends making contact with levers 23 mounted on a rock shaft 24, journalled in the sides 4 and 5 of the casing The rock shaft 24 has also secured thereto a lever 25, the free end of which extends into a slot 26 formed in the stem or shank 21 of the key heretofore designated in Fig. 1 by the reference numeral G. For the purpose of returning the latter key to its normal or uppermost position, there is provided a spring 28 surrounding the stem 21, the upward movement of the key G being limited by means of a pin or like element 29 located beneath the casing top 2. It will be noted that the corresponding rods |3A, I3B, I30, I 3D and 3E have their bent portions located forwardly of the levers 23, so that the rods are enabled to reciprocate when influenced by any of the numeral keys or row-clearance keys; it will also appear that the operation of the general clearance key G will move all of the rods simultaneously, so as to effect a clearance of the entire keyboard at one time, and will serve, when desired, to eliminate the necessity of operating all of the individual clearance keys C in the several numeral rows.

Extending transversely of the interior of the casing is a shaft 38 on which are mounted a plu rality of bellcrank levers 3|, these levers corresponding in number to the number of clearing rods I3, and being independently movable or pivoted on the shaft 38. Each of the bellcrank levers 3| is provided with an upwardly extending arm 32, the upper end of which is provided with an enlargement 33 in which is formed a slot 34. A pin 35 is carried by each of the clearance rods and projects laterally thereof into the slot 34 of the associated lever 3 I, in such a manner that the rods l3 may be moved forwardly or to the left (Fig. 5), without actuating the associated bellcrank lever. Each of the levers 3|' is also provided with an arm 36 which extends forwardly in a substantially horizontal direction, and which normally contacts with a sleeve 31 slidably mounted on an arm 38 of an adjacent bellcrank lever 39, the levers 39 corresponding in number to the bellcrank levers 3|. Each of the levers 39 also includes a downwardly extending arm 40, the purpose of which will be hereinafter more fully described. Each of the sleeves 31 above referred to is normally held in an extended position, as shown by Fig. 5, by a coil spring 4| carried by the arm 38 of the lever. Each of these sleeves is also provided with a projecting pin 31A which contacts the front edge of an associated lever 42, the levers 42 being fixedly mounted on a shaft 43 extending transversely of the casing and conveniently mounted in its side walls. A single lever 44 is also secured to the shaft 43, and is slotted at its free end so as to receive the lower end of a stem 45 associated with the key of button designated by the letter R. This key is normally returned to and held in raised position by means of a spring 46, the upward thrust of which is limited by means of a pin 41 carried by the shank 45, and arranged to abut the under surface of the top 2 at the upper limit of movement of the key and shank.

To permit passage through the top 2 of the stem 45, there is provided an elongated opening 48, the stem also being arranged to be retained in depressed position through the agency of a projection or tooth 49 adapted to engage the under surface of the top 2 adjacent the slot 48, whereby the key R may be positioned in depressed relation. This effect is also contributed to by a bow spring 58 (Fig. 5) arranged to shift the stem in the elongated aperture therefor, when the key is depressed. The stem or shank 45 is provided near its lower extremity with a transversely projecting pin 5| which bears against the upper face of the lever 44, with the result that when the key R is depressed, the lever 44 will lock the shaft 43, causing the levers 42 to actuate the several sleeves 31 against their springs,.and along the arms 38 of the bellcrank levers 39. It results from this that the sleeves 31 are removed from contact with the arms 36 of the bellcrank levers 3|, thereby permitting the levers 39'to operate independently of levers 3|. It is however the normal function of levers 39 to actuate levers 3|, as will hereinafter more fully appear.

As a means of mounting the bellcrank levers 39, there is provided a shaft 39A which is mounted in brackets 52, the levers 39 being held against movement in one direction by means of a stop 53 formed on each of the brackets, and arranged to make contact with that arm of the lever 39 located adjacent the bracket.

Secured to the under surface of the top 2 of the casing, are a plurality of longitudinally extending strips 54. These are formed of insulating material and are so arranged in spaced relation on opposite sides of the stems or shanks ll of the numeral-bearing keys, that the stems or shanks of the keys pass between the paired strips 54. The insulating strips serve primarily the purpose of mounting elements for the switch parts through which selected circuits are established incident to manipulation of the keys. The switches are secured to the strips, and so located as to be spaced on opposite sides, and extend into the path of the stem or shank of the key,

which thus serves as the switch actuating memher.

The switches associated with each of the key stems or shanks I consist of cooperating contact members 55 and 56 on one side of the stem, and 51 and 58 on the opposite'side. By preference, the members 55 and 51 are formed of a resilient conducting metal, and are so arranged as to be moved outwardly and to contact respectively with the members 56 and 58 when the stem associated with a preselected key, is depressed.

Located in and disposed longitudinally of the casing are a plurality of solenoids 59A, 59B, 59C, 59D and 59E, one thereof being operatively related to the counting unit of each of the colums or rows of numerabkeys, the stationary portions of each of these solenoid assemblies bein secured to the bottom of the casing. Connected at preselected points of the coil winding of each of the solenoids, are a plurality of conductors 68, 6|, 62, 63, 64, 65, 66, 61 and 68, these conductors being in turn connected to the switch members 5 of that particular column or row of keys to which the given solenoid is functionally associated; for example, the solenoid 59A is con- .nected to the switch member 5 in the row A of the numbered keys, the solenoid 5913 to the row B of such keys, and so through the several columns or rows. It is to be noted that the conductors 60, etc., are all electrically connected to the rear portion of the associated electromagnet or solenoid, as willappear from Figs. 4 and 25.

The several switch members 55 of the row A of the number keys, have attached thereto conductors 69A, these conductors being secured to a conductor 18A which is in turn connected to a contact 1 IA mounted in the stator 12 of a control switch. Similarly, the switch members 55 of the row B have conductors 59B connected thereto, the latter being in turn connected to a conductor 183 which is directed to a contact MB in the stator 12. In a similar manner the switch members 55 in the row C are connected to a stationary contact 1IC through the agency of conductors 69C and 180.

In corresponding fashion, the switch members 55 in the row D are electrically connected to the contact 1ID through conductors 59D and 18D, and switch members 55 in the row E, are connected to the contact 1|E through conductors 59E and 18E.

Referring further to the sequence or control switch, the stator 12 therefor consists of an annulus or ring formed of insulating material in and about which the contacts 1IA, H3, H0, ND and HE are spaced at equal angles or distances. Within the stator is mounted a rotor element 13, also formed of insulating material, and which carries a conductorring 14 on one of its faces, being further provided with a contact brush 15 connected to the ring and projecting beyond the periphery of the rotor. As will appear upon rotation of the rotor the brush 15 will engage in sequence the stationary contacts carried by the stator and heretofore described, in a manner progressively to complete electrical circuits to the switch members 55 in the rows A, B, C, D and E. The elements just described will best appear from Fig. 3 and their circuit relation best understood from Fig. 25.

The rotor 18 is mounted on a shaft 15 (Fig. 3) which is journalled at one end in a bracket 11 dependingly supported from the top 2 of the easing, and at its opposite end in a screw threaded sleeve 18 carried, for example, by one of the side walls of the casing. A ratchet wheel 19 which is concentric or coaxial with the shaft 16, is fixed to the rotor of the switch, an l is impelled in one direction of rotation by a pawl 88 pivotally carried on one face of a gear 8 I, loosely mounted on the, shaft 15. This gear or pinion 8| normally enmeshes with a rack element 82 (Figs. 2 and 3), formed by preference of insulating material, and which forms part of the support 83 for the armature 84 of a solenoid 85, provided for the purpose of operating the sequence or control switch M. As shown by Fig. 2, the armature 84 is normally returned in the position shown by means of a coil spring 85. In order to prevent a return of the solenoid armature 84 too quickly after the current in the.

solenoid winding 85 is interrupted, there is provided a disc 81 slidably mounted on the shaft 16 (Fig. 3), and which is urged against the rotor of this switch by the coil spring 88, the loading of the spring being regulated by the threaded adjustment of sleeve 18 heretofore described. The frictional relation established through the spring between disc 81 and rotor 13, acts as a damping agency for controlling the rate of return of the solenoid armature under the influence of the spring 86.

During the power movement of the armature 94, the rack 82 operates to rotate the gear 8| in such a direction that the pawl 88 will ride .over the ratchet wheel 19 without actuating the rotor, but upon the return movement of the armature, gear 8I will rotate in the opposite direction, and due to the engagement of the pawl 88 with the ratchet wheel 19 secured to the rotor 19, the

latter will now rotate, causing the contact brush 15 to traverse and sequentially to engage the contacts 1IA, 1|B, 1I "D and HE. By preference, and in the ex mple of the disclosure, the movement of the armature 84 and the rack 82 is sufllcient to rotate the gear 8| substantially a complete revolution, or in any event, to an extent such that the contact brush 15 moves through an arc somewhat greater than that between the contacts HA and "E.

It will further appear from Fig. 3 that there is provided a contact brush 89, carried by a strip of insulation 98, the latter being in turn secured to the casing, and a conductor 9| serving to connect the brush 89 to the conductor 92.

The bar M of the master control switch is provided with a stem 83 formed of insulating material, by preference, the stem or shank 88 being embraced by a coil spring 98A, due to which the bar M is normally held in outermost or raised position. Its upward movement is limited by means of a pin, or the like 94, extending through the stem 99 and contacting for purposes of limiting movement, with the under surface of the top 2.

Secured to the under side of the top 2 and spaced on opposite sides of the stem 93, are plates of insulating material 95 and 98 (Fig. 2), there being secured to the plate 95 switch mem bers 91 and 98, the conductor 92 being connected to the member 91 and a conductor 99 serving to connect the member 98 and one end of the winding of solenoid 85. Similarly, the plate 98 serves as a mounting for switch members I88 and IN, the former having connection with a conductor I82 and the latter to a conductor I83, the opposite end of which has a connection to the opposite end of the winding of solenoid 85. The switch members 98 and I 8| are of spring material such as a resilient metal, and are brought into contact with the members 91 and I88 when the bar M and so the stem 98 are depressed, whereby there is established a circuit through the solenoid 85.

Similarly to certain of the switch keys heretofore described, the key or button K referred to in connection with Fig. 1, is provided with a shank, stem or plunger portion I84, which projects through the top 2 of the casing, and which is normally kept in raised or circuit-opening position by a coil spring I85. The extent of upward or outward thrust of the plunger due to this spring, is limited by a pin I85 carried by the shank I84, and adapted to abut the under surface of the top 2. The shank I84 is further provided with a projection or tooth I81 arranged to be brought beneath the lower surface of the top 2, adjacent the shank aperture, so as to maintain the key in depressed position when desired, and so as to keep the supply circuit to the machine closed for as long a time as may be necessary without continued manual pressure on the key.

Extending along the under surface of the top element 2 and on opposite sides of the stem I84, are insulating plates I88 and I89, the former serving to carry switch members H8 and III. In similar manner there are secured to the insulating plate I89, switch elements H2 and III, the latter being preferably of resilient or spring metal, and so located as to be brought into contact with the members I I8 and II 2 responsively to depressing movement of the key or bar K. Conductors II8A, H83, H80, I|8D and BE are shown as secured one each to the in- 9,195,207 dividual members IIO, these conductors IIIA,

H33, H30, IIODand HOEbelnginturn attached to the conductors "A, 10B, 10C, 10D and "E heretofore referred to and connected respectively to the stator contacts of the sequence or control switch shown by Fig. 3. A conductor "4 is electrically connected with the member III, the element II4 either constituting or being connected to one leg of a feeder circuit for the electric system of the machine. The opposite leg II5 of such a circuit, is connected to the member II3, while the conductor I02 leads from the member II2 to the element I00 oi the control switch. Connected to the conductor I02 is a lead III, which serves in effect as a bus or trunk conductor, to the latter being connected branch conductors or leads 1A, H13, H10, ID and IE, these latter being connected respectively to the switch members 51 along the rows A, .B, C, D and E of the numeral-bearing keys of the present disclosure. Attached to the switch members 53 of these rows are conductors H3, H3, I23, I2I, I22, I23, I24, I and I29, there being one such conductor for each of the numeral key switches in each of the columns or rows, as will clearly appear from the wiring diagram of Fig. 25.

Referring further to the assembly and structure of each of the solenoids 59A, 59B, 59C, 59D and 5915:, there is arranged for movement in each of the coils thereof, an armature or core I2'I. Each of such armatures is mounted on and supported by a guide rod I29, this rod being formed of insulating material and projecting beyond the ends of the solenoid core with which the armature is operatively associated. The portion I29 of the rod I29, projecting toward the forward part of the machine, is provided in its upper surface and near one end with a recess I30 (Fig. 5). Over this recess extends the free end of a leaf spring I3 I, the opposite end of this spring being secured to the portion I29. Mounted on the free end of this spring is a wedge-shaped cam, projection or tooth I32, so arranged that during the travel of the rod I29, particularly the portion I29 thereof, this projection will make a camming contact with the arm or lever heretofore described (see Fig. 5). The parts are further so arranged that during the power stroke of the solenoid, the inclined face of this projection will contact with the arm 40, which being restrained from movement by the projection 53 on the bracket 52, will force the spring member I3I into the recess I30. However, on the return movement of the rod portion I29, the vertical face of the tooth or projection I32 will contact the arm 40 in a manner to rock the bellcrank lever 33-40, and will also actuate the bellcrank lever 3I, moving the clearance rod to which the latter is connected, and thereby releasing any numeral key in the appurtenant row which may have been depressed, and at the same time permitting movement of the switch parts associated with such key, to switch-openposition.

Secured .to the bottom of the casing and extending forwardly from each of the solenoid assemblies, is a strip of insulating material I33, each of said strips being characterized by paired upstanding, parallel flanges or ribs I34 and I35. The latter elements are spaced inwardly from the longitudinal edges of each strip and parallel the path of travel of the rod portion I 29 heretofore described. There results from the parallel relation and spacing of ribs I34 and I35, an intervening channel in which moves a projection I 39, formed on the under side of the rod portion I29, and adjacent its outer or free end.

Carried by the strip I33 and'outside of the rib I35, are a plurality of spring members III which correspond in number to the switch members 53, one of the members I3'I being connected 'to the free end of each of the conductors III,

II9, I20, l2l, I22, I23, I24, I25, and I29. The spring members I31 are angulate, preferably substantially L-shaped, and each carries on its vertical leg a contact plunger I38 which projects through an opening I39 in the flange or rib I35,

preferably to a point substantially midway of the channel. Located on the strip I33 and on the outside of the rib I34, are angulately formed spring members I40, each carrying a contact plunger or projection I4I, each of these plungers extending through an opening I42 formed in the rib or flange I34. It is to be noted that the plungers last referred to are disposed opposite the plungers I38, so that the paired elements I39-I4I will be normally actuated in pair as the projection I38 is moved in spreading or deflecting relation therebetween. The flange or rib I34 is provided with apertured extensions I43 in the apertures of which is slidably disposed a rod I44, the latter having its front end I45 bent at an angle so as to extend in the path of the end of the rod portion I29, and so be abutted thereby when the rod approaches one end of its path of travel. For the purpose of retracting the rod I44, there is provided a spring I43 (Fig. 5) which tends to bias the rod rearwardly when displaced as a result of operation of the solenoid to move the rod portion I29 to the outer limit of its movement.

The rod I44 is also provided with a plurality of lateral projections I" which are so spaced and arranged as to make contact with the 'rear edges of the upper portions of a number of levers I48, the latter being pivoted intermediate their ends to the flange or rib I34. The lower portions of these levers are biased forwardly by springs I49, but when the parts occupy the positions shown by Fig. 5, the levers are positioned by the projections I" on the rod I44. As will be seen from Figs. 12 and 17, the contact plungers I are each provided with a recess I50, which the lower end of the adjacent lever I48 is adapted to enter when the plunger or button has been moved outwardly as shown. The purpose of this arrangement will be hereinafter explained in detail.

Attached to the L-shaped contact members I40, are conductors I5I, I52, I53, I54, I55, I53, I51, I59 and I59, the opposite ends of these conductors being connected at preferably equidistant points along the solenoid winding in order commencing from the front end thereof, with the result that when the circuits are established, the coil will be divided into a series of contiguous active zones, the first such zone being that portion of the coil between the conductors 60 and I5I, the next between conductors 6| and I52, and so in the series through the coil, there being preferably at least the same number of zones in each solenoid winding as there are numeral or character keys in the column or row controlling the given solenoid.

Referring further to the solenoid assembly, the rear portion I90 of the rod I23 projects beyond the rear end of the associated winding or core, and is formed to provide a rack I6I on its upper face. This portion I60 is provided at or near its free end with a downwardly extending projection I62, to which is attached one end of a return spring I63, the opposite end of the spring being anchored, for example to the rear end of the solenoid. A stop I64 projects upwardly from the base or bottom of the casing and is located to be engaged by the projection I62, and thereby limit the travel of the rack in the direction of the return spring pull, the stop and projection, or one thereof, being provided with a cushioning element (not shown).

Each of the racks I6I meshes with a gear I66, which is rotatably carried by a sleeve I66 (Fig. 20). A pawl I61 is pivotallly mounted on one face of the gear I 66, and is adapted coactingly to engage with a ratchet wheel I69 formed on or secured to one face of a gear I69 which is also loosely mounted on the sleeve I 66, and located on the pawl-bearing side of the gear I66. A second gear I16 is also loosely mounted on the sleeve I66, and on the opposite side of the gear I66. The gears I69 and I 16 mesh with a pinion or gear I1I which may be of the type shown by Fig. 20, or may, if preferred, be a gear of bevel type. This pinion is rotatably carried by a boss I12 projecting upwardly from the base of the casing. The relation of the pinion to the gears I66 and I16 is obviously such as to compel the gears I 69 and I 16 to rotate in opposite directions when either is actuated. Secured to the ends of the sleeves I66 are gears I13 and I14, the gear I14 meshing with one of a plurality of gears I16 each carried by a face of one of a series of counting or indieating elements I16A, I16B, I16C, I16D and I16E. On the opposite side face of each counting element or wheel, is a segmental gear I11 (Fig. 22), which meshes through a stated or predetermined angle of its rotation with the gear I19, so as to turn the next adjacent counting wheel through an angle, for example, one tenth revolution, corresponding to the next higher member or character. When, in the case of numerals, the next higher number is to be attained than is carried by a given counter or wheel, as for example when the numeral 9 is reached on the wheel I 16A and this element is operated one step farther, the segment I11 engages the gear I13 of the group of gears operating the wheel H613, and rotates it so as to bring into view the numeral 1, through the window in the top of the casing, while a cipher appears on the wheel I16A. ,It is to be understood that there is a separate group of gears for the operation of each counting unit as shown in Fig. 18, it being also understood that the gear I19 is preferably omitted from the gear unit or group identified with the end counter of the series, in the disclosed example, the counting wheel I16A, as such element would have no function in this group.

Extending through each of the sleeves I66 is a short shaft or shaft section I19, which is connected to the short shaft in an adjacent set of gears or sleeve in such a manner that while each of the short shafts is capable of independent rotation, they all may be moved or shifted simultaneously in a longitudinal or an axial direction. Each of the shaft sections is provided with pins I19 and I96 which are of such length as to extend through slots I" and I62 formed in the sleeve I66, and l we their ends projecting beyond the sleeve (Fig. 21). The pins I19 and I99 are designed to be moved into and out of recesses I93 and I94 formed in the gears I69 and I16, respectively, by movement of a knob I96 located outside of the casing. This movement of the knob serves to lock the sleeve I66 and gears I13 and I14, with one or the other of the gears I69 and I16 as desired, which will thereby control the direction of rotation of the counting or computing wheels, due to the fact that the gears I69 and I16 are compelled, as heretofore noted, to rotate in opposite directions. By this provision the preselected forward or reverse gear can be interlocked with the gears that operate the counting or computing: wheels. It is to be understood that while the shaft. sections can rotate freely, independently of each other, the connections between the shaft sections .are' such that a substantially rigid or unitary sectional shaft results so that bearings therefor are "required only at each end of the composite shaft assembly.

The counting units identified with wheels I16A, I163, I160, I16D and H611 are provided with hubs I96 and I91, projecting from opposite sides of the wheels, the hubs I91 each being provided with a notch I99. The counter or computing wheels are loosely mounted on a hollow shaft I99 which has openings I96 therethrough, these openings being adapted to register with the notches I99 in the hub I91.

Within the shaft I99 are secured a plurality of angulate spring members I 9i which have their short ends projecting slightly into the openings 196, and interiorly of the hollow shaft is located a shaft I92, provided with longitudinally spaced enlargements, collars or camming members I93, equal in number to the spring members I9I The hollow shaft I99 is provided at one end with a closure or plug I94, through which the shaft I92 projects, and to the projecting end of the shaft is pivoted a crank handle I95, provided with a fulcrum projection or lug I96 which rides on a ring I91 conveniently projecting from the side 6 of the casing.

Formed on the shaft I92, and spaced inwardly from the end of the side 6 of the casing is a collar or projection I99 (Fig. 21), which is slidably secured to the hollow shaft I99 as by a key I 99. A spring 266 is disposed between the collar and the closure or plug I94, this spring tending normally to bias the collar away from the closure, and thereby tending to tilt the crank handle I96 into the position shown by Fig. 18;

As will have appeared, the purpose of the structure just described is to reset the counters or counting wheels I16A, I163, I160, I16D and I16E, to a zero reading. To eifect this resetting operation, the handle I96 is moved into the position shown in Fig. 21, that is with the shank of the handle at about a right angle to the element I92. This movement of the crank serves to displace the shaft I92 longitudinally in a direction to the right (Fig. 21) and thus causes the enlargements or camming members I92 to bear against and outwardly deflect each of the springs I9 I. with. theshaft I92 in this extended position,'the handle may be turned in either direction, and as the openings I96 are brought into register with the notches I69, the angulate ends of the springs I9I enter the notches and cause the counters or counting wheels to rotate directly with the shafts I92 and I 99. Since the notches I99 are so formed and located as to work opposite the same number or character on each of the counters or counting wheels, it will appear that only one complete revolution of the crank is necessary to align all of the counting wheels in a manner to restore them all to the same or a zero reading. Upon releasing the handle, the spring 266 again shifts the shaft I92 along its axis, bringing the enlarged portions I99 out of contact with springs IOI, which then move inwardly and retract from the notches I88, following which the counters are again independently movable and available for further totalling or calculating operations.

Referring again to the assembly of Figs. 20, 22,

23 and 24, it will be noted that the gears I14 and "am always enmeshed, as are also the gear I95 and rack I5I. From this there results a prevention of any tendency of the counters to overrun when actuated for totalling or other calculating purposes; the gears and wheels, with the exception of gears I55, also fit rather snugly on their respective shafts or sleeves, so as to obviate any tendency to excess movement or spinning after the action of the rack I5I has ceased.

While the operation of the different parts, and hence of the assembly of the device, is

; thought to be obvious from the foregoing description of the elements and their several purposes, the function and use of the mechanism as a whole may be briefly reviewed as follows:

The conductors 92 and I02 are connected in well understood manner to a source of electrical energy (not shown), as through the conductors 92A and 9213. One example of a convenient and usual form of connection, is one of the cord and plug type, which being well known in the electrical arts, need not be described in detail.

Conductors 92 and I02 will serve to supply electric energy to the switch members 91 and I00, respectively, of the master control switch. and at the same time the brush 89 is energized through conductor 9 I, as are the switch members 51 identified with each of the columns or rows A, B, C, D and E.

Assuming now by way of example, that the operator desires to add numbers 185 and 1029;

-he will first depress the key in row A bearing the numeral 5, such key being releasably retained in depressed position by the clearance bar for that row. The next operation takes place in row B, where the key bearing numeral 8 is depressed, and thereafter in similar manner, key No. 1 in row C. Following this, the bar M is depressed to close the circuit between the switch members 91 and 98, and between members I00 and IN. Thiswill actuate the solenoid 85 with the effect of drawing the armature 84 and rack 82 against the action of the spring 85; However, because of the effect of the ratchet l9 and pawl 80, th rotor 13 is not yet moved, but upon releasing the bar M, the bar moves upwardly under the influence of its spring 93A, and

the circuit through the solenoid 85 is broken, following which spring 85 initiates the movement of rack 82 and the armature back to their starting positions. During this phase of the operation, the ratchet and pawl come into action and operate the switch rotor, it being noted that the ring I4 is energized through the brush 89. As

the rotor commences to move, the brush 15 will first come into contact with the stationary contact HA of the stator which will serve to com-' plete the circuit through the conductor 10A, thence into the conductor 59A, thence through switch parts 55 and 55 adjacent the key 5, thence through the conductor 54 of the solenoid coil. Current is taken from the coil through the conductor I55, thence to the button I 4|, button I38, conductor I22, the switch members 58 and 51, conductors IA and H5, and thence through conductor I02 and through the main conductor 923. When the circuit has been thus completed,

the armature oi the solenoid moves into that zone of the solenoid coil which has been energized. In the example given, such energized zone will consist of that portion of the -winding between the points of connection of conductors 84' and I55. When the armature or core of the solenoid is moved into this zone, it also moves the rack I5I to a degree to operate the group of gears of the counter assembly to-rotate the numeral or counting wheel to an extent that the numeral 5 shows through the window 8A, corresponding to the column or row A. During the described movement of the armature and rack of i the solenoid associated with row A, the rod portion I29 bearing the-projection I89 has also been in motion. The first step of the latter movement is to-release the end I45 of the bar I44, permitting the spring I45 to move the bar or rod I44 and thereby release the upper ends of the several swingable levers I48 associated with the given assembly.

As has been previously noted,-the projection I36 traveling in the channel between the ribs or-fianges I34 and I serves to force apart the paired plungers or buttons I88 and I, as it passes these elements. As they are thus forced apart, the springs I49 will cause a movement of the lower ends of the levers I48 into the notches I50. This operation is continued until the proiection has separated the plungers to which the conductors I55 and I22 are attached. Atthis time the circuit through the winding of the coil is broken, following which the spring I59 will initiate the return movement of the armature to its starting position. As the armature nears the end of its return travel, the projection or tooth I32 makes. contact with the arm of the bellcrank 39, causing it to rock the bellcrank lever 3|, which, in turn, will draw the clearance rod forward and release the button or key that has been ,theretofore depressed, and will also serve to open the switches that have been closed by depression of such button.

As the armature approaches or attains the end of its return stroke, the end of the rod portion I29 engages the bent portion I of the rod I44, moving it longitudinally, and causing the projections I41 to rock the levers I48 and to release the plungers I4I which have been held thereby. At this stage the operation, of elements in response to actuation of the key in row A, has been completed. Bythis time the rotor brush has moved sufficiently to reach the contact 'IIB, where the circuit is completed through the solenoid winding zone controlled by. the key bearing the numeral 8. Since the action resulting from and subsequent to the closing of the electric circuit through I IB is the same as described in connection with the row A, with the exception of the extent of armature travel, the subsequent movements need not be described in detail. The switch rotor next closes the circuit through the contact flIC where the same operations are completed. This will clear the keyboard as only three keys have been depressed and the machine is ready for the next setup or calculating operation. i

To effect the next operation the operator depresses the key 9 in column or row A, key 2 in row B, none in row C, as the zero appears in that row, and key 1 in row D. The numerals 1, 8 and 5 have appeared in their respective windows and the solenoid 85 is again in its starting position. The bar M is again depressed, closing the control switch, and will again operate the solenoid 84 and the master control, switch. As the solenoid 59A is energized, the gear, groups operated by the rack I8I of the associated solenoid, will again operate the counters or wheels I'I6A through an angular distance corresponding to 9 numerals. Otherwise expressed, the accumulation of the nine additional stages of movement will bring the count in the unit, to a total of 14. As the zero or cipher on the wheel IIGA passes the window 9A, the segment I" on that wheel engages the gear I19 of the next gear group and serves to move the counter wheel IIBB through, say of a revolution. The solenoid 59A then completes its cycle of operation as previously described in clearing row A. In the example given, the solenoid 593 next is brought into action and serves to actuate the wheel or counter I'I6B through two additional points. In

' so doing, the segment IT! on the wheel I16B comes into engagement with the gear I13 of the group operated by the solenoid 59C, and moves it one point. The solenoid 593 then completes the cycle and clears the row 3.

'Since in the example given the solenoid 590 should retain its initial or zero reading, this coil is not energized by the master control switch, no key having been depressed in the row C corresponding to this coil. In sequence, the master control switch then closes the circuit in the first zone of the solenoid 59D and the numeral 1 appears in the window corresponding to the row D. From the foregoing it will appear that when the described operations are completed, the numerals 1, 2, l, 4 appear through the windows corresponding respectively to the rows D, C, B and A, this number being the sum of 185 and 1029. Assuming no further addition to be desired and no other operation contemplated, the wheels or counters IIBA, I163, I160, "ED and II6E are reset to zero or initial reading in the manner previously described, through the manip ulation of the crank I95 and associated resetting elements.

When the device is to be utilized for additive operations in the manner described, the knob I95 (Fig. 18) is brought to occupy its inward position as represented by solid lines (Fig. 18) under which condition the gear I69 is engaged with the pin I19 and forms the driving element for operating the group of gears. When, however, the knob I85 is drawn outwardly, the gear I is engaged with the pin I90 and becomes the driving element of the gear group; however, as this gear is driven through the pinion I'll it always rotates in a direction opposite that of the gear I69, from which it will appear obvious that the counters I'IIiA, I168, INC, IIGD and I "E are driven in a direction the reverse of that noted in connection with the operations of addition, but in response however to the same movement of the rack NH and armature or core of each solenoid. 1

In the event the operator should depress the wrong key in any one of the columns or rows, his mistake may be easily rectified by pressing the key marked C, in the row in which the error has been committed; the effect of the depression of the row-clearance key is, as before referred to, to shift the clearance bar for that row, and to release, prior to any effect in the totaling or other calculating mechanism of the machine, the key that has been incorrectly depressed.

Should it be desired to clear all of the rows without operating the solenoids or without requiring manipulation of all of the row-clearance keys, key G, being the general clearance key, is depressed. This movement serves to actuate the lever in a manner to rock the-shaft 24 and in turn the levers 23 in a manner to move simultaneously, all of the several ray-clearance bars and thereby to release all of the depressed keys by means of a single manipulative operation.

Should it be desired to repeat the same numbers in the various rows, the repeat key, designated at R, is depressed, the effect of this being to move the arm 44 downwardly, rocking the shaft 43 and causing arms 42, mounted on this shaft, to shift the sleeves 31 forwardly and out of contact with the arm 36 of the bellcrank lever 3|. at this time the operation of the arm 40 of bellcrank lever 39, under the influence of the pro- Jection or tooth I32, will be without effect on the bellcrank l'ever 3|. From this it results that the clearance rods are not operated by the actuation of the electromagnets or solenoids, until the repeat key is again released.

It will be understood that after each cycle of operations of the solenoid 85, bar M, serving to close the circuit through the control switch, must again be depressed in order to initiate a new cycle of operations.

The speed of the rotor I3 is so controlled through the agencies described, that the brush 15 engages the contacts 'IIA, TIB, NC, ND and HE, at least for a suificient time during the movement of the rotor, to permit a full stroke of the solenoids controlled through the several contacts. If desired, a somewhat longer period or interval is permissible, since the circuit through the solenoid coil is broken by the separation of the plungers I39 and I II as the armatureattains the preselected zone of the associated coil or winding.

It will be noted that the gear 9| and gears I85 serve to set into operation the parts associated therewith, only when rotating in one direction, the rotation in the opposite direction as influenced by the reciprocatory movement of the associated racks, being an idle or return rotation, and performing no work.

It will also be noted that it is entirely possible and feasible so todispose the parts of the counter gear units, that such units when operated by the solenoid racks, will function either on the power stroke or on the return stroke of the solenoid armature, without departing from the intended scope of the invention, this charge being effected as may be desirable in certain instances, by reversing the ratchet and pawl mechanism through which is driven the gear I69.

One important feature of the present assembly consists in dividing the windings or coils of each of the solenoids 59A, 59B, 59C, 59D and 59E, into zones which are selectively energizable by the actuation of selected keys in the rows A, B, C, D and E. By this provision, the extent of rotation imparted to each of the'counter gear. groups by the solenoid of that group, is accurately controlled and effected as a result of depression of a numeral key, with a minimum of parts and mechanism.

Another noteworthy. feature of the present construction consists in the interruption of the solenoid circuit through the coil zone when the armature has reached that zone, this being accomplished through the limit switch means described, this result being attained independently of the control switch. There is thus established a maximum interval of energization of the desired portion or zone of the solenoid coil, which would not ,be the case were the energization of the coil dependent upon the time during which the operator held in depressed position, a given numeral-selecting key or like control.

It may further be mentioned that after a selection is made, through the column keys, of a zone of one of the solenoids to be energized, the circuit through that zone is not completed until the rotor I3 is operated to a given position, and that as soon as the armature is brought to occupy the preselected zone, the circuit is again broken due to the separation of the plungers or buttons I38 and I4 I, these elements being maintained in separated or circuit-opening relation until after the key utilized in making the zone selection has been cleared. This arrangement obviates any possibility of the solenoid acting more than once during the period of passage of the brush I5 over the stator contact corresponding to the particular solenoid.

For eifecting certain classes of addition or other calculating work, it may be desirable to accelerate the action of the solenoids 59A, 59B, 59C, 59D and 59E, in such a manner that the device will operate to accumulate or total, and will function for other operations, without employing the control switch and solenoid shown by Fig. 2. Under this form of usage, the counting or calculating units are instantly responsive to depression of the numeral keys in several rows of columns. When desired for this form of usage, the switch controlled by the button K is closed, this switch having been first directly connected to the feeder circuit or source of electrical energy. The closing of this switch will serve to energize the switch members 55 and 51 in each of the rows A, B, C, D and E. As a consequence, when one of the keys in the row E, for example, is depressed, the circuit is established through the zone of the solenoid 59E which has been selected by the depressed key, and the armature I21 is advanced into that zone, so that the proper figure is almost instantly presented through the window 9E without any delay which might otherwise be incident to the movement of the control switch rotor as operated by the solenoid 85. For example, after the key bearing the numeral 2 is depressed, members 55 and 51 being energized, will serve immediately to energize the switch members 56 and 58 respectively. By reason of the conductors BI and I 52, that portion of the solenoid winding to which they are attached, and the plungers I38 and I, the circuit is completed and so remains until the solenoid armature has operated to an extent to cause the plungers I39 and I to be separated by the projection I36.- Since the projection I32 operates the clearing mechanism before the rod I is retracted to 0perate the levers for releasing the limit switch plungers that have been forced apart thereby, it will be seen that the solenoid 59E will be operated only once in response to a single depressing movement of any of the numeral keys.

It is further to be noted that when the key K is depressed, it is retained by the projection or tooth on the stem I04, with the result that the switch members H0 and III, and H2 and H3 remain in contact or in circuit-closing relation. When this switch is thus closed, it will be noted that two or more of the solenoids which operate the counters or counting gear units, may be so operated simultaneously, which is not possible when the control switch identified with Fig. 3, is utilized. When the operator is availing himself of this mode of operation, it may be noted as advisable that the keys selected in the several columns or rows, be depressed in order from right to left, so as to assure the correct functional relation between the adjacent counting units of the several rows.

Many of the details of the wiring, placement of conductors within the casing and connection thereof to the switches and switching units will be obvious to those skilled in the electrical arts, and require no detailed description. Among such provisions there may be mentioned a preference for the disposition in the casing, of an electrical receptacle to which conductors 92A and 92B are attached, and a similar receptacle for conductors H4 and H5. These elements may be of a type adapted to receive detachable plugs or some other suitable form of appliance connection. It is in any case obviously desirable to locate all or substantially all of the wiring connections interiorly of the casing.

While the invention has' been described by making detailed and specific reference to a simplified embodiment thereof, and in the interest of brevity, has been described by reference to a machine primarily to be utilized for addition and subtraction, the specification is to be understood solely in a descriptive and not in a limiting sense, since many changes may be made in the parts, their arrangements, their combinations, their circuit and wiring arrangements, as well as in the purposes and uses of the device, all with out departing from the spirit and full intended scope of the invention as defined by the appended claims.

I claim as my invention:

1. In a calculating machine, key-controlled differential mechanism for translating effective key actuations to an accumulator device, said mechanism comprising a plurality of number selecting keys, a plurality of switches functionally connected to the keys, an electromagnet in circuit with said switches and a source of energy, the electromagnet being characterized by a single, tapped winding providing a plurality of selectively energizable zones of substantially equal magnetic extent, an electromagnetic element reciprocable in said electromagnet winding and operatively connected to said accumulator device, said winding and switches being so connected in circuit as to control the zones of energization of the winding, and therethrough, the extent of actuation of said electromagnetic element, a limit switch for each energizable zone of said winding, operable by the electromagnetic element, latching means for the limit switches, latch-releasing means operable by said element, and keyreleasing means operable by said element upon attaining a predetermined position.

2. In a calculating machine, key-controlled differential mechanism for translating efiective key actuations to an accumulator device, said mechanism comprising an electromagnet including a continuous, tapped winding providing a plurality of energizable zones of substantially equal magnetic extent, an armature reciprocable in said winding and operatively connected to said accumulator device, a plurality of control keys, a plurality of switching devices arranged for operation by the control keys, and in circuit with the tapped winding so as to permit energization of the magnetic zones thereof one at a time, an additional plurality of switches in circuit with said tapped winding, said switches being operated by the armature in one direction of its movement, to limit the energization of said winding zones, irrespective of the closure of the keyactuated switching devices, and means operable by the armature during its movement in the opposite direction, for restoring the control keys and switching devices to switch-open position.

3. In a calculating machine, key-controlled diflerential mechanism for translating effective key actuating movements to an accumulator device, said mechanism comprising a plurality of selectively operable keys, an electric switch operable by each of said keys, an electromagnetic device, including a continuous, tapped winding in circuit with said switches and a source of energy, said winding providing a plurality of energizable zones of substantially equal magnetic extent, each zone having its energization under the control of one of said key-operated switches, an armature reciprocably movable in said winding and operatively connected to said accumulator device, means under direct control of the armature for terminating the energization of any given zone of said winding as the armature is actuated to and attains such zone, and means operable by said armature for restoring to inactive positions, the key and its control switch effecting the energization of said given zone.

4. In a calculating machine, key-controlled differential mechanism for translating key actuating movements to an accumulator device, said mechanism comprising a plurality of control switches, a manually operated key for actuating each switch, an electromagnet winding, tapped to provide a plurality of energizable zones of substantially equal magnetic extent, said winding being in circuit with said switches such that each of the energizable zones thereof is controlled by one of said switches, an armature associated with said winding and operatively connected to said accumulator device, switching means caused to terminate energization of the winding zones by the armature upon completion of a predetermined range of its movement, and means operable by the armature for causing a restoration of the previously operated keys and switches actuated thereby, to inactive positions.

5. In a calculating machine, mechanism for translating the efiect of key setting movements to an accumulator device, the mechanism including a plurality of key-influenced switches, an electromagnetic winding characterized by selectively energizable zones of substantially equal magnetic length, controlled respectively by said switches, armature means associated with said winding and operatively related to the accumulator device, a limit switch in circuit with each of said winding zones, the limit switches being disposed for sequential actuation by said armature means upon attaining successive predetermined positions, and operable to de-energize the winding zones irrespective of position of the keyinfluenced switches, and an armature-actuated device for restoring the last said switches to open position.

6. In a calculating machine, mechanism for translating the effect of key setting operations to an accumulator device, the mechanism including an electromagnet winding tapped to provide a plurality of energizable zones, key-actuated switches each in circuit with one of said winding zones, an armature for said winding operatively related to the accumulator device, limit switches each in circuit with one of said winding zones,

said limit switches being operable to open-circuit positions by the armature upon its attaining successive predetermined positions, means for latching each limit switch in circuit-open position as it is actuated thereto by the armature, means for releasing-the latching means when the armature has attained a predetermined position in its path, and means operable by the armature for restoring the key-actuated switches to circuit-opening position.

7. In a calculating machine, including selecting keys and accumulator mechanism, a device for translating the eflect of key setting movements tothe accumulator mechanism, the device including a key-{influenced electromagnet, an armature therefor operatively related to the accumulator mechanism, a limit switch in circuit with the electromagnet and operable responsively to the armature upon attaining a predetermined position, a latch arranged to retain the limit switch in circuit-open position when opened by movement of the armature, and latch tripping means operable responsively to movement of the armature into a predetermined portion of its path of travel. 4

8. In a calculating machine, key-controlled mechanism for translating the eifect of key setting movements to an accumulator device, said mechanism including a plurality of control keys,

switch means operatively related to each of said keys, an electromagnetic device including a reciprocable armature operatively connected to said accumulator device and an energizing winding for said armature, said winding being characterized by a plurality of energizable zones each in circuit with one of the key-actuated switch means, latch means for retaining the keys in actuated positions and the associated switch means in closed positions, and latch tripping means operable by the armature in one direction of its movement.

9. In a calculating machine, key-controlled mechanism for translating the effect of key settings to an accumulator device, said mechanism including a plurality of control keys, switch means operatively related to each of said keys, an electromagnetic device including a reciprocable armature operatively connected to said accumulator device and an energizing winding for the armature, said winding being characterized by a plurality of energizable zones each in circuit with one of said switch means, latching means associated with the keys and adapted to retain them inactuated and switch closing positions, a trip lever associated with the latching means and a cam element operatively associated with said armature, the cam element being formed and arranged to actuate the trip lever responsively to movement of the cam element and armature in one direction in a restricted portion of the path of travel thereof, and to clear the trip lever when moving in the opposite direction.

10. In a calculating machine, key-controlled mechanism for translating key settings to an accumulator device, said mechanism including a plurality of keys, switch means operated by each key, an electromagnet winding characterized by a plurality of energizable zones of substantially equal magnetic extent, the energization of each zone being controlled by one of said key-operated switch means, an armature functionally associated with said winding zones, spring means arranged to urge said armature to an initial position, said armature being operatively connected to said accumulator device, a projection on said armature, normally closed limit switches each in circuit with one of said energizable zones of the winding and located in the path of travel of said armature projection, means on said projection 7 operable in one direction of armature travel to open-circuit said limit switches, whereby to effect deenergization of said winding zones, and means operated by the armature on its return movement to said initial position under the influence of said spring means, effective to restore said limit switches to closed positions.

11. In a calculating machine, key-controlled mechanism for translating effective key movements to an accumulator device, said mechanism including a plurality of keys, switch means operated by each key, means for releasably latching said keys and associated switch means in switch-closed positions upon key actuation thereto, an electromagnet winding characterized by a plurality of energizable zones of substantially'equal magnetic extent, the energization of each zone being controlled by one of said keyoperated switch means, an armature functionally associated with said winding zones, spring means arranged to urge said armature to an initial position, said armature being operatively connected to said accumulator device, a projection on said armature, normally closed limit switches each in circuit with one of said winding zones and located in the path of travel of said armature projection, means on said projection operable in one direction of armature travel, for open-circuiting said limit switches, whereby to effect deenergization of said winding zones, means operated by the armature on its return movement to said initial position under the influence of said spring means, effective to restore said limit switches to closed positions, and additional means operable by said armature on its return movement to initial position, to release said key latch means, whereby to restore said keys and associated switch means to switch-open positions.

EUGENE S. BUSH. 20

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