US1968972A - thieme - Google Patents

Description

Aug. 7, 1934. o. THIEME COMBINED TYPEWRITING AND COMPUTING MACHINE Ofiginal Filed June 18, 1928 3 Sheets-Sheet 1 INVENTOR:

Aug. 7, 1934. o THiEME 1,968,972

COMBINED TYPEWRITING A ND COMPUTING MACHINE Original Filed June 18, 1928 3 Sheets-Sheet 2 INVENTOR:

Aug. 7, 1934. o. THIEME COMBINED TYPEWRITING AND COMPUTING MACHINE Original Filed June 18, 1928 3 Sheets-Sheet 5 NYENTOR:

Patented Aug. 7, 1934 UNITED STATES COMBINED TYPEWVRITING AND 1 COMPUTING MACHINE Otto Thieme, Hartford, Conn, assignor to Elliott-J Fisher Company, New tion of Delaware Original application Ju 286,218. Divided and 9, 1931, Serial No. 567,7

23 Claims.

This invention relates to key-locking devices in computing machines, particularly where they are combined with typewriting mechanisms.

The invention is shown as embodied in an 6 Underwood typewriting machine having totalizers and a master wheel, which is operable by the numeral-keys of the typewriter. This class of machine is shown in the Kurowski application No. 74,698, filed December 11, 1925 (now 10 Patent No. 1,835,165, dated December 8, 1931).

This application is a division of my pending application No. 286,218, filed June 18, 1928.

The master wheel is indexible by means of a set of independently operable digit-cams, one

16 connected to each numeral-key. The key is mounted upon a type-bar-operating lever. The link extends from the digit-cam down alongside of the key-lever. The latter has a laterally projecting pin which extends into a slot in the face 20 of the link, thereby making a detachable driving connection between thealink and the keylever.

The links are guided in a horizontal crossrack, and the latter may be shifted endwise to shift the links away from the pins, so that the key-levers may be operated without affecting the indexing mechanism or the master wheel.

A transverse trough or channel receives the row of key-locks, which have the form of rods having rounded ends. The set of rods, placed end to end, is nearly sumcient to fill out the trough, but there is enough looseness in the set to permit a single link to enter between any ad-. jacent rods, to move all rods to key-locking po-.

sitions. All of the links have shoulders, and, when one link is operated, its shoulder presses down between the adjacent rod-ends; and crowds the rods end to end, so as to intercept the shoulders on the other links, and prevent them from operating. This prevents another key from being depressed.

When said rack is shifted endwise, it shifts all the links out of connection with the keylevers, and thereby frees the numeral-keys from interference with said key-1ocking devices, so

that when the typewriter is to be operated without computing, the numeral-keys may be operated more rapidly.

The tabulator-keys of this machine also oooperate with said set of key-locking rods, so that the operation of any tabulator-key will lock up the rods, and prevent any numeral-key from being operated. Similarly the operation of any numeral-key prevents any tabulator-key from being operated.

York, N. Y., a corpora-' ne 18, 1928, Serial No. glis application October The machine is also provided with the usual carriage-feeding key-bar for making spaces between words, and this is connected to a train that co-operates with the locking rods aforesaid, so that the spacing key cannot be operated when any numeral-type key is being depressed, and so that a numeral-type key can not be operated when the space-key is being depressed.

The machine is also provided with a backspacing key for the carriage, and this is also connectedto the key-locking train, so that the carriage cannot be back-spaced when any numoral-key is being depressed, and also so that no numeral-key can be operated when the carriage is being back-spaced.

A universal rock-shaft is provided which is operable by any tabulator-key, and it is also operable by the space-key, and also by the backspacing key.- This shaft has an arm which is adapted to force its way between the ends of adjacent key-rocking rods, to lock the same after the operation of either tabulator-key or backspacing key, with the results above given.

The key-locking mechanism is inexpensive to manufacture, and readily operable by the links, and by the various spacing devices as aforesaid, and is economical in space, and is readily insertible in the machine at a point above the keylevers and below the indexing mechanism, and. is not liable to get out of order. V

In order to silence the computing mechanism to permit the machine to be used simply for typewriting, a lever at the front of the machine may be depressed, and this forces down a link which has at its lower end means for camming said link-rack endwise, thereby disconnecting all of the links from the keys, and hence silencing both the indexing mechanism and the key-locking mechanism at the operation of the numeral-keys.

The case-shift key-lever of the typewriter is connected to another link having a cam for camming said link-rack endwise, to disconnect the numeral-keys and the key-locking mechanism when the case-shift key is depressed.

Other features and advantages will herein-v after appear.

In the accompanying drawings,

Figure 1 is a vertical section through an Underwood typewriting machine, showing a totalizer mounted upon a truck movable with the typewriter-carriage, a totalizer-actuating mechanism at the front Of the machine-frame with the associated typewriter parts connected thereto.

Figure 2 is a detached view, in perspective, of the parts operated to disconnect the totalizeractuating and key-lock mechanism from the numeral-key levers.

Figure 3 is a skeleton view, in perspective, of

many co-operative parts, looking diagonally into the machine from a rear corner, many of the The Underwood typewriting machine includes alphabet-keys and numeral-keys 31, which, when depressed, operate key-levers 32 extending rearwardly to fulcrum upon a pivot-wire 33 to vibrate a bell-crank 34 swingable about a fulcrum-wire 35, to vibrate a type-bar 36 radially swingable about a curved fulcrum-wire 37, to strike the front face of a platen 38 mounted to rotate within a platen-frame 39, case-shiftable within a carriage 40 movable upon a carriageguiding rod 41, and further provided with a center roll 42 to run upon a track 43 at the front of the machine-frame 44. The carriage 40 has a feed-rack 45 in train with a pinion 46 that drives an escapement-wheel 47 operative through a carriage-motor, not shown, to effect letterspacing movements of the carriage by escapement-dogs 48 vibrated by a universal bar 49 driven rearwardly through the impact of each type-bar in typing. Letter-spacing may also be effected by the usual space-bar 50 connecting the front ends of two levers 51 joined to a springpressed rock-shaft 52 having an arm 53 extending rearwardly to engage an extension 54, forming a part of an escapement-rocker 55.

The computing mechanism includes two mechanisms, an actuator-mechanism 67, fixed to the machine-framea and a totalizer-mechanism 68 movable with the carriage 40. The frame preferably is cast with a rail-section 71 along the upper edge, through which a V-shaped groove- 72 is machined to provide bearing faces for two pairs of rolls 73.

A rail 79, having an inverted V-shaped raceway to ride upon the rolls 73, is driven to and fro by connections with a pair .of arms 80, one arm secured at each end of the front rail 81 of the carriage-frame 40.

Upon a shaft 138 there are mounted a series of camming actuators 139, one actuator for each numeral-key. Each actuator has pivoted at the side thereof, as at 148, a sheet-metal link 149 pendent therefrom with the lower end 150 extending below the plane of the keys. The series of links 149 are guided by passing through slots 152 (see Figure 3) in a plate 153 arranged for sliding movement upon the top face of the crossbar 57. Each slot 152 is formed with a clearance opening 154 through which the wider lower end 150 of the links 149 may be inserted sidewise up to a narrow neck 155, then turned a quarter around to lower a wider section 156 into the slots 152, and the links may then be adjusted upon their pivots 148.

As the actuators 139 are normally aligned by their stop-faces 147, and it is'desirable to align H the keys 31 and the key-levers 32 independently of the actuators, adjustable means for articulatv ing the links 149 to the key-levers, are provided to compensate for variations in manufacture of the actuators 139, the links 149 and the keylevers 32. To this end, each numeral-key lever 32 is provided with a rockable link-pivot-carrier 157 pivoted to the key-lever at 158 and rockably adjusted by set screws 159 to raise or lower astud 160 projecting from the face of an arm 161, forming a part of the carrier 157. Each projecting stud 160 may thus be aligned with a slot 162 in each link 149, and when the studs are finally adjusted to their slots, each link will be free toswing sidewise off the stud and become disconnected from its key-lever. To effect this side swing of the links 149, the slotted plate 153, which is guided by the screw-and-slot connections, is given a longitudinal movement upon the bar 57 against the tension of a spring 164. The forced movement of the plate 153 to the left of Figure 3 disconnects all the links 149 from their studs 160, and the actuators 139 and links 149 are held raised by their springs 144, and the numeral-keys 31 may be depressed without vibrating these parts of the actuating mechanism.

Other means to sever the connections between the numeral-key levers 32 and the links149 include a bell-crank having a crank-arm 165 and a pointer-arm 166 to indicate the mechanical state of either on or off for the connections 149, see Figures 3 and 5. The bell-crank is secured-to the end of a stud 167 having a bear ing in a cross-bar 168 and secured to a lever 169 at the rear of said bar. swingable with the crank-arm between stoppositions determined by a pinandslot connection 170 and held in either stop-position by a suitable detent 17 1. The free end of the lever has a long rod 172 secured thereto, which in turn pendently supports a connection 173 that is guided at the lower freeend by.a slot 174 in the plate 153 and by a pin 175 in the bar 57. The connection 173 is formed with a cam-face 1.76 to engage the end of the slot 174 that opcrates to shift the plate 153 and remove the links 149 from the key-lever driven studs 160 when the crank-arm 165 is shifted to the off position.

It is necessary in all computing mechanisms to provide means to prevent the simultaneous depression of two numeral-keys. Heretofore this means, becausethey were engaged by the keylevers, were effective whether the computing connections are operative or inoperative; hence the fast typing of numerals when the computing connections are inoperative is interfered with by these interlocking elements, and is objectionable. The present improvement provides interlocking elements to co-operate with the links 149, so that when said links are shifted to a non-computing position the numeral-keys are restored to their normal typewriter touch. To this end, each link 149 is shaped at one edge to form a lip 177, normally within the plate 153 but clearing the bar 57, and passable downwardly through a slot 57 in the bar when theassociated key is depressed.

To co-operate with the lip 177 of each link 149, a series of round rods 180, see Figure 4, are arranged horizontally end to end within a groove 179 in the bar 57, as clearly disclosed in Figure 4, where the series of rods 180 have a slight longitudinal endwise movement. between a fixed stop 1181 and an adjustable stop 182, on said bar 57, said endwise movement being equal The lever 169 is meral-key when other keys in the keyboard are the depression of any link 149, as follows.

5 from which arm, and the arm 192, links 198 N to 'the key-levers 200.

to the thickness of a link 149 so that only one link at a timemay be operated by its numeralkey. The lengths of the rods 180 equal the spacing of the links 149 and the ends of all the rods may be rounded to promote the entrance of a link between adjoining rod-ends.: Itwill be noted in Figure 5 that when the plate 153-is assembled upon said bar 57, the rods 180, although slidable endwise under said plate, cannot become dislodged from the groove 179;

The links 149 when shifted sidewise for disconnection from the numeral-key levers 32 are locked against downward movement by reason of the lips 177 of said links being then opposed by the top of the bar 57. To this end the linkclearing slots 57 in said bar are made only wide enough to freely admit said lips when the links 149 are coupled to the key-levers for computing. This locking of the links 149 when they are disconnected from the key-levers prevents untoward operation of the computing actuators 139. v

It is not only necessary to prevent the depression of two numeral-keys, but it is also essential to prevent the depression ofany nudepressed, such as the space-bar 50, a backspace key 183,and any tabulator-key 186, and these several keys are operative to close up the working gap between the rods 180 and prevent Each space-bar lever 51 is provided with a link 187 demountably secured thereto, see Figures 1, 3 and 5, and with the free end thereof pivotally connected to a crank-arm 188 operative to rock a shaft 189 having bearings in a.

pair of arms .190 extending rearwardly from bar 57, said shaft having a restoring spring 191 under tension between the pin on one of said arms 190 and a pin on the shaft 189. A crankarm 192 is secured to the shaft 189 to vibrate the interval the space-bar is depressed the numeral-key links 149 are blocked by the rods 180. Conversely, operation of any numeral-key and its link 149 looks the space-bar.

The rock-shaft 189 also carries an arm 197 depend with their lower ends supporting a universal bar 199 underlying a series of levers 200 depressible by the denominational tabulato-re keys 135. One of the levers 200 may have a pair of prongs 201 to straddle the bar 199, and

the bar 199 may have a pair of pins 202, to straddle one of the prongs 201, see Figure 3,. to prevent displacement of the bar relatively When a tabulator-key 186 isgdepressed the shaft 189 is rocked,- by means of said universal bar 199, to force the tongue 196 to spread the'rods 180- as described for the space-bar.

The back-space key 183 operates to rock the shaft 189, to prevent the depression of a numeral-key, by means of a stud 203 set in a side of the back-space key-lever 204 to engage a ,cam-face 205 on an arm 206 fixed to said shaft.

The two case-shift keys 184 and 185, instead of locking the numeral-keys31 to prevent computivemovements, operate to shift the slideplate 153 to disconnect the computing mechanism from the numeral-keys, see Figure 3. The key 184 is pivotally connected to a slide 207 formed to take a vertical sliding bearing in the bar 57, and also formed with a cam-face 208 to pass through a suitable slot 209 in the slideplate 153 and cam the end of said slot to shift theplate 153 and disconnect the links 149 from all the numeral-key levers, when the key is depressed. Similarly, the depression of the shift-key 185 atqthe opposite side of the keyboard operates a slide 210 within the bar 57 and has a cam-face 211 to engage the end of the plate 153 to shift it in the same direction as by the key 184 when depressed.

The-.actuator-cams 139 are alike in size and shape, but the scope of the camming slots 212 varies with each actuator to enable each actuator, when vibrated by its numeral-key, to convey a rocking motion to a universal shaft 213, equivalent to the numerical value of the key depressed; hence the uniform depression of all the numeral keys uniformly vibrates their actuators 139a fixed extent, but the variations in the slots 212 convey differential rockingmotions to the shaft 213 through each slot engaging astud 214 carried by crank-arms 215 individual to each actuator and fixed in alignment upon the shaft 213.

The shaft 213 and its series of crank-arms 215 are at the driving end of a connected train of mechanisms operative to positively accomplish a definite result'at the driven end of the train, while the actuator-cams are at the end of driven trains actuated by the numeral-keys Secured to the shaft 213 is a crank-arm 221. The free end of the arm 221 has a long stud 223, see Figure 5, projecting from the face thereof, upon which the lower end of a link 224 is mounted, and the upper end of said link is pivotally secured to agear-sector 225, which in turn is connected to a pinion 242.

I The pinion 242 is the driven element for a train of parts that rotate the master-gear 246, and are all supported upon a shaft 247 secured to said master-gear, and rotatable within bearings in two brackets 230 and 248. The pinion 242 is formed integrally with a clutch-member 249 having an even number of slots 250 through the periphery thereof. The pinion 242 and its clutch-member 249 are spaced apart and rotate freely as a unit upon the shaft 247. To co-operate with the clutch-member 249 there is mounted on the shaft 247 a clutch-member slidable along said shaft and having a head 253 formed with suitable clutching teeth 254 to interlock within the slots 250 of the clutchmember 249, a second head 255 having diametrically' disposed tongues 256 to slidably engage within slotscut through a head 258 forming a part of the master-gear 246.

-It will be noted that an annular groove 259 separates the two heads 253 and 255 of the sliding clutch-member, and within this groove 259 a roll 260, pivotally mounted upon a crank arm stud 261, operates to shift the clutch-member along the shaft 247.

The crank-arm (not shown), carrying said stud 251, is vibrated by the initial down stroke numeral key-actuated'type-bars and computing actuator-mechanisms, one for each of thenugear driving clutch before motion is transmitted to the gear-sector225.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be usedwithout others.

- Having thus described'my invention, I claim:

1. In a combined typewriting and computing machine having a letter-feeding carriage, the combination with a nest of alphabet and nu' meral type-bars co-operative with a front-strike platen in said carriage, and a set of type-baroperating key-levers below the nest of type-bars and forming forwardly of the latter a typewriterkeyboard, of a master-wheel mechanism for a totalizer traveling with said' carriage, said master-wheel mechanism including a set of rockable digit-evaluators arranged above the keyboard, a link, connected to, and extending downwardly from, each digit-evaluator, at the region between the nest of type -bars and the keyboard, for articulation, with a corresponding numeralkey lever, each link having a locking lip, a bridge supported to extend across the row of links at said region, immediately above the key-levers, and a series of locking elements supported by said bridge and spreadable by the entry of a lip of any link therebetween to prevent simultaneous operation of any other link, said bridge including'means slidably guiding the links formaintaining them in articulation with the key-' levers, said guiding means being disposed immediately above the points of entry of the lips between the locking elements.

2. Machine constructed according to claim 1, said link-guiding means arrangedto be shifted on said bridge for disconnecting and reconnecting the links from and to the numeral-key levers.

3. In a combined typewriting and computing machine, the combination with a series of I? numeral-key-actuated type-bars, a letter-spaceable carriage, a space-bar having levers operable to letter-space the carriage, tabulator-keys operable to 'tabulate the carriage, and computing actuator-mechanisms, each actuator having a pendent link connecting it to a corresponding numeral-key-lever to type and compute a numeral, of means to prevent the joint depression, of any two numeral-key-levers, including a series of longitudinally disposed rods having a working gap tobe filled by means movable by each key-lever, and means for filling up said working gap to prevent the depression of any numeral-key actuated means during the depression of the space-bar or any tabulator-key, said last means including a shaft rockable by the space-bar or by the tabulator-keys and having a gap-filling tongue to engage the rods.

4. In a combined typewriting and computing machine, the combination with a series of merals 1 to 9, each actuator having a pendent link connecting it to a corresponding numeral-key-lever to type and compute a numeral, of a protective interfering mechanism operative to prevent the joint depression of any two numeral-key-levers by interfering with the joint depression of two of the pendent links,- and manually-operable means for shifting and thereby disconnecting all the pendent-links from their mechanism and links being arranged so that each and every link is locked against depression when thelinks are disconnected from the key-levers.

5. In a combined typewriting and computing machine, having a series of key-levers and types operated thereby for typing the numerals l to"9., and computing mechanism including a master wheel and indexing mechanism therefor, said indexing mechanism including actuator-cams for variably operating the master wheel, the combination of links for operating said actuator-cams, said links extending alongside of the key-levers, means for disconnectibly articulating'the linkstothe key-levers, a transverse rack for the links, said rack shiftable endwise to disconnect the links from the key-levers by shifting the links laterally, said articulating means being arranged for ready articulation, and key-locking means operable by shoulders on said links, whereby when the levers are connected to the indexing mechanism they are subject .to the-control of the key-locking means ior preventing joint operation of any two levers, but are freely operable independently of the key-locking 'm'eans'when the links are disengaged from the levers;-

6. In a'combined typewriting and computing machine, havinga series of key-levers and types operated thereby for typing the numerals l to 9, and computing mechanism including a master wheel and indexing mechanism therefor, said indexing mechanism including actuatorcams for variably operating the master wheel, the combination of links for operating said actuator-cams, said links extending alongside of the key-levers, means for disconnectibly'articulating the links to thekey-levers, a transverse rack for the links, said rack shiftable endwise to disconnect the links from the key-levers by shifting the links laterally, and key-locking means operable by shoulders on said links, whereby when the levers are connected to the indexing mechanism they are subject to the control of the key-locking means for'preventing joint operation of any two levers, butare freely operable" independently of the key-locking means when the'links are disengaged from the levers, said key-locking means including a series of round-nosed rods placed end to end, and a'structure'retaining said rods and arranged'so that any of said link-shoulders is insertible between adjacent rods, to move the remaining rods to link-locking positions.

7. In a combined typewriting and computing machine, having a series of key-levers and types operated thereby to print the numerals 1 to 9, and computing mechanism including a master wheel and indexing mechanism therefor,

said indexing mechanism including actuatorcams for variably operating the master wheel, the combination of links for operating said actuator-cams, said links extending alongside the key-levers, means for disconnectibly attaching the links to the key-levers, a transverse rack for the links, said rack shiftable endwise to disconnect the links from the key-levers by shifting the links laterally, key-locking means operable by shoulders on said links, whereby when the levers are connected to the indexing mechanism they are subject to the control of the key-locking means for preventing joint operation of any twolevers, but are freely operable independently of the key-locking means when the links are disengaged from the levers, said key-locking means including a series of round-nosed rods placed end to end, and a structure retaining said rods and arranged so that any of said link-shoulders is insertible between adjacent rods, to move the remaining rods to link-locking positions, a finger-piece,.and an operating train connecting said finger-piece to said link-rack, to disconnect the links and looking means from the keys.

8. In a combined typewriting and computing machine, having a series of key-levers and types operated thereby to print the numerals l to 9, and computing mechanism including a master wheel and actuatorecams for variably operating the master wheel, the combination of links vfor operating said actuator-cams, said links extending down alongside of the keylevers, means disconnectibly attaching the links to the key-levers, a transverse rack for the links, said rack ,shiftable endwise to disconnect the links from the key-levers by shifting the links laterally, a row of key-locking devices operable by shoulders on said links, whereby when the levers are connected to the indexing mechanism they are subject to the control of the key-locking devices to prevent joint operation of any two levers, but are freely operable independently or the key-locking devices when the links are disengaged from the levers, an additional device movable between adjacent key-locking devices, and carriage-spacing and back-spacing keys each capable of operating said additional device.

9. Inacombined typewriting and computing machine, ,having a series of key-levers and types operated thereby to print the numerals 1 to,9, and computing mechanism including a master wheel and indexing mechanism therefor, ;said indexing mechanism including actuator-cams for variably operating the master wheel, the combination of links for operating said actuator-cams, said links extending alongside of; the key-levers, means for disconnectibly attaching the links to the key-levers, a transverse rack for the links, said rack shiftable end wise to disconnect the links from the key-levers by, shifting said links laterally, key-locking means operable by shoulders on said links, whereby when the levers are connected to the indexing'mechanism they are subject to the control'oftheikeyelocking means to prevent joint operation of any two levers, but are freely operable independently of the key-locking means when the .links are disengaged from the levers, said key-locking. means including a series of round-nosed rods placed end to end, and any of said link-shoulders being insortable between adjacent rods, to move the remaining rods to link-locking positions, a case-shift mechanism, and means controlled thereby for shifting said link-rack endwise, to disconnect the keys from the indexing mechanism and from the key-locking means. r 1 10. In a combined typewriting and computing machine, having type-operating key-levers and a set of digit-indexing computing cams, the combination'of links extending from the cams tothe key-levers, detachable connections between the key-levers and the links, a transverse rack ior the'links, said rack movable endwise to detach the links from the key-levers by shifting the=links laterally, and key-locking devices engageable by shoulders upon the links, whereby when the keys are connected to the indexing cams, the key-levers may coact through the q links" with the key-locking devices to prevent 5 joint operation of any two levers, but when said rack is shifted, said key-levers are disconnected from the indexing cams and also from the keylocking devices, said key-locking devices includin" a structure in which are retained short rods having rounded ends and assembled loosely in said structure with suflicient endwise space to admit a single link, whereby the remaining links and keys are locked, said structure arranged to admit said link-shoulders and to permit the lateral shift of the links.

11. In a combined typewriting and computing machine, the combination with a row. of numeral-key-levers, a row of computing actuatormechanisms over the row of key-levers, and links connecting said key-levers to correspond ing actuator-mechanisms,each link having formed between its points. of connection to. said key-levers and actuator-mechanisms a lip, of a longitudinal series of end-to-end round nosed rodsv adjacent the row of lips, and having a working end-clearance space, as a series, between fixed end stops to be filled by any one of said lips, when the corresponding numeralkey is depressed in computing, structure in which said rods are retained, said structure including said end stops and being formed to admit said lips, but otherwise clearing said links, a rock-shaft, near said structure, for operating a tongue connected to saidrock-shaft, said tonguebeing insertible in said clearance space between said rods, a row of depressible tabulatingekeyilevers, and a universal bar for the tabulating-key levers and underlying the same, said rock-shaft'having armsconnected to said universal bar.

12. In-a combined typewriting and computing machine, the combination with a row of numeral-keydevers, a row of computing actuatorinechanisms over the row of key-levers, and links connecting said key-levers to corresponding actuator-mechanisms, each link having formed between its points of connection tosaid key-levers and actuator-mechanisms a lip, of,

a longitudinal series of end-to-end round nosed rods, adjacent the row of lips, and having a working end-clearance space, as a series, between fixed end stops to be filled by any one of said lips, when the corresponding numeralkey is depressed in computing, structure in which said rods, are retained, said structure including said end stops and being formed to admit said lips, but otherwise clearing said links, a rock-shaft for operating a tongue connected thereto, said tongue being insertible in said clearancespace between said rods, a row of depressible tabulating-key levers under the row of numeral-key-levers, and a universal bar for the tabulating-key levers and underlying the same, said rock-shaft having arms to which are connected pendent links supporting said universal bar.

. 13. Machine constructed according to claim 1l having a. back-space key-lever, and operating connectionsbetween the rock-shaft and backspace key-lever, whereby operation of the latter rocks said shaft to lock the numeral-keys,

and wherebyoperation of the numeral-keys locks apart, therock-shaft having spaced arms from which depend links connected at their lower ends to said space-bar arms. a

15. In a combined typewriting and computing machine, the combination with a row ofnumeral-key-levers, a row of computing actuatormechanisms over the row of key-levers, and links connecting said key-levers to corresponding actuator-mechanisms, each link having formed between its points of connection to said key-levers and actuator-mechanisms a lip, of a longitudinal series of end-to-end round nosed rods adjacent the row of lips, and havingaworking end-clearance space, as a series, between fixed end stops to befilled by any one of said lips, when the corresponding numeral-key is depressed in computing, structure in which said rods are retained, said structure including said end stops and being formedv to admit said lips, but otherwise clearing said links, said links being swingablelaterally about their connections to the actuator-mechanisms and being detachably articulated to the levers, so that in so swinging they may be disconnected from said keylevers, and a slide supported by said structure, through which said links pass, said slide being shiitable endwise to disconnect the links from the key-levers 16. In a combined typewriting and computing machine, the combination with a row of numer-- al-key-levers, a row of computing actuatormechanisms over thev row of key-1evers, and links connecting said key-levers to correspond-- ing actuator-mechanisms, each link having formed between its points of connection to said key-levers and actuator-mechanisms a lip, of a longitudinal series of end-to-end round nosed rods adjacent the row of lips, and having a working end-clearance space, as a series, be-

tween fixed end stops to be filled by any one of said lips, .whenthe corresponding numeral-key is depressed in computing, structure in which,

said rods are retained, said structure including said end stops and being formed to admit said i lips, but otherwise clearing said links, said links being swingable laterally about their connections to the actuator-mechanisms and being detachably articulated to the levers, so that in so swinging they may be disconnected from said key-levers, 'a slide supported by said structure, through which said links pass, said slide being shiftable endwise to disconnect the links from the key-levers, a case-shift key-lever, and a camming link rising from said case-shift key-.

1 lever, and slidably guided at'its upper end, said camming link cooperating at said upper end to cam and thereby shift said slide endwise to disconnect the links from the levers upon operation of the case-shift lever. r

17. In a combined typewriting and computing machine, the combination with a row of numeral-key-levers, a row of computing actuatormechanisms over the row of key-levers, and links connecting said key-levers to corresponding actuator-mechanisms, each link having formed between its points of connection to said keylevers and actuator-mechanisms a lip, of a longitudinal series of end-to-end round nosed rods adjacent the row of lips, and having a working end-clearance space, as a series, between fixed end stops to be filled by any one of said lips, when the corresponding numeral-key is depressed in computing, structure in which said rods are retained, said structure including said i end stops and being formed to admit said lips,

but otherwise clearing said links, said links being swingable laterally about their connections to the actuator-mechanisms and being detachably articulated to the levers, so that in so swinging they may be disconnected from said keylevers, a. slide supported by said structure, through which said links pass, said slide being shiftable endwise to disconnect the links from the key-levers, a manually-operable crank-arm spaced from said slide, and a camming link connected at oneend to said crank-arm, and having its other end in camming relation to said slide, whereby, upon operation of said crank-arm, said slide is moved endwise to disconnect said connecting links from said levers.

18. Machine constructed according to claim' 1'7, the slide having a spring for restoring the same to thereby reconnect the connecting links to the key-levers upon retraction of the camming link.

19. In a combined typewriting'and computing machine having a traveling paper-carriage and typing mechanism including a row of numeral-key-levers, said levers being below said carriage, the combination with a row of actuators corresponding to the numeral-key-levers for operating computing devices carried by said carriage, and links depending from said actuators and detachably connected to the numeral-keylevers, so as to be shiftable laterally from the numeral-key-levers, of a structure extending transversely of said links and having a series of locking devices co-operating with said links so that only one link at 'atime may be depressed, each link having a jog forminga lip' which is insertible between said devices, a rockshaft near said structure and having connected thereto a tongue insertible between said locking devices, to enable the latter to prevent operation of any of. the links, a plurality of keys,

ing numeral-key levers, the links being formed 7 to co-operate with a series of spreadable looking elements for preventing simultaneous operation' of any two key-levers, a slide immediately above said locking elements, through which said links pass, said slide being shittable endwise to disconnect the links from the numeral-key levers, and having perforations fitting the links-laterally, and a key-locking tongue operative to spread said elements for looking all the keys, the slide having an opening to admit said tongue, said opening being enlarged topermit endwise movement of the slide without interiering with said tongue. I 1 N 22. In a combined typewriting and computing machine, the combination with a row of numeral-key-levers, a row of computing actuatormechanisms over the row or" key-levers, and links connecting said key-levers to corresponding" actuator-mechanisms, each link having formed between its points of connection to said key-levers and actuator-mechanisms a lip, of a longitudinal series of end-to-end round nosed rods adjacent the row of lips, and having a working end-clearance space, as a series, between fixed end stops to be filled by any one of said lips, when the corresponding numeralkey is depressed in computing to thereby lock the other keys, a bar spanning said links and having a longitudinal trough in which said rods are laid, and a plate on said bar covering said trough to retain said rods and having perforations to slidably guide the links for entry of the lips between the rods, the lips of the links, in the normal position of the links following the key-lever return strokes, being retracted within said perforations to clear said rods, said bar having lip-clearing slots extending transversely of said plate and trough, said end stops extending into said trough.

23. In a combined typewriting and computing machine, the combination with a row of numeral-key-levers, a row of computing actuator-mechanisms over the row of key-levers, and links connecting said key-levers to corresponding actuator-mechanisms, each link having formed between its points of connection to said key-levers and actuator-mechanisms a lip, of a longitudinal series of end-to-end round nosed rods adjacent the row of lips, and having a working end-clearance space, as a series, between fixed end stops to be filled by any one of said lips, when the corresponding numeralkey is depressed in computing to thereby lock the other keys, a bar extending transversely of said links, said bar having a trough to retain said rods and being provided with said end stops and being slotted to admit said lips, but otherwise clearing said links, each lip being formed in its link by a jog in the latter which also clears said bar, and a cover-plate for said trough on said bar to retain said rods and having perforations to slidably guide the links for entry of the lips between the rods, said lips being, in the normal positions of the links following the key-lever return strokes, retracted within said perforations to clear said rods, said plate being shiftable on the bar for disconnecting and reconnecting the links and key-levers.

OTTO THIEME.

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