US1621488A - Typewriting machine - Google Patents

Description

March 22, 1.927.v n H. A. AVERY TYPWRITING MACHINE y Y Filed April 4:l` 1925 2 Sheets-Sheet 2 N f ATTORNEYJ? Patented 2z, y1927. I i 1,621,4 88 y.

UNITED sTATEsPArl-:NT OFFICE.A

TO L C SMITH & CORONA TYPEWRITERS INC., OF SYRACUSE, NEW YORK, A COR- PORATION F NEW YORK. y

y, TYPEWBITING MACHINE.

Application led April 4, 1925. lSerial No'. 20,729.

This invention relates to improvements in Fig. 5 a detail view showing the rigid contypewriting machines, and more particularly nection between the right hand shift key' to portable typewriting machines'which are lever and the shift frame, the parts being in transported in carrying cases. normal or lower case position.

5,' The invention has for its objects to pro- The improvements have been illustrated 5 vide a simple and inexpensive case-shifting in connection with a 'portable typewriting and locking device for portable typewriting machine known as the Corona four" and machines having shifting plateus adapted to its carrying case, but may bc embodied in be collapsed without releasing the shift lock; other machines.

lo to provide a case-shifting and locking'mech- The main frame l of the machine is pro- 6o anism for Ia .typewriting machine lhaving a vided with suitable rubber supporting feet shiftable platen adapted to be collapsed byA 2. The platen 3 is journaled in the end pressure from a case cover; to'provide a plates of a platen carriage 4 which is supshit'ting and locking .mechanism for the ported in a downwardly and rearwardly inplaten .carriage of a portable typewriting clined position on suitable'anti-friction beara5 machine adapted to positively shift the ings lto travel transversely of the machine platen carriage and parts movable therewith on a downwardly and rearwardly inclined to upper case position and then spring or l carriage bed 5. The carriage bed 5 is shift-- yield to permitrsecure locking of the parts, able upwardly and rearwardly at right ansaid mechanism being also arranged so that glesto the planeof the bed from the position l70 the platen carriage and parts shiftable thereshown in Fig. `2 to the position shown in with may be forced to normalposition by Fig'. 1 to change case. An antifriction supback pressure resulting from vforcing an enporting and guiding means for the bed is closing case cover down over the machine provided comprising a pair of brackets 6 with the platen carriage locked in upper case extending downwardly and forwardly from 75 posit-ion. the under side o f the bed adjacent opposite Other objectsv and advantages of the imends of the bed and rigidly secured at their provements will appear from the following upper ends to said bed, these brackets being description of thepreferred embodiment of connectedv at Ytheir lower ends by atrans :zo the invention,illustrated in the accompany- -verse brace rod' 7 and provided with raceso ing drawings: way slots 8 foranti-friction balls 9 traveling I ln the drawings: in raceway channels 1() in a pair of brackets Figure 1 is a vertical longitudinal secl '11 secured t0 the main frame of the machine tional view of a typewritingmachine showat opposite sides thereof. The channels l0 ing the collapsible case shifting and locking 1n the brackets 11 extend in a plane at right s; i

mechanism, the platen carriage. being` shown angles of the lplane of the carriage bed 5 locked in upper case position; parallel with the slots 8' in the brackets i.

' Fig. 2 a view similar to Fig. 1 showing the A rock .shaft 12- extends transversely of main frame standing' on the base member of` the machine and is journaled at its ends on 40 a. closed carrying case and the platen carthe main frame 1. A pair of forwardly-and 90 riage forced down-'to and held in lowercase upwardly extending rock arms -13 fixed on, position by the cover member of the v,case said shaft are'provided at their forward with the shift lock still-in locking posit-ion;v ends kwith 'outwardly extending pins 14 en Fig. '3 a perspective view showing the -gaged'in upwardly and forwardly extending I l5 case shift mechanism, the Aparts being in slots 15 in the brackets 6. Theweight of the 95 vnormal lower case position' c shiftable carriage support and partsmount- Fig. 4 a detail view showingthe yielding ed thereon is partly counter-balanced by a vconnectionbetweenthe left hand shift key coll spring'16 connected at onel end to a lever and the shift vvframe,lthe partslbeing in central rock arm 17 extending forwardly 5U normal orlower case position; and from the rock shaft and at its otherend to a 300 "stop f lo I platen support. lThe with a Ashift key`28 at its shifting platen support and isconnecte bracket 18 secured to the main frame. In

the normal lower case position of the platen ycarriage thev stop lugs '19 on brackets 6 abut against the upper end of stop screws 20 on the brackets 11. The' carriage is arrested in upper case position by the engagement of screws21 onbrackets 6 with stop lugs 22 on brackets 11. y

The carriage' support is adapted to be shifted to upper case position either through the medium of a temporary shift lever- 23 or through the mediumof a shifting and locking lever 24, said levers being o general arch form and pivoted. intermedlate their ends substantially at the highest points thereof on horizontal pivot screws 25 supported on the main frame adjacent the top of.said frame and forward of the Shiftable downwardly and for# wardly extending arm of the shift lever .23 is provided .with a shift key 26 at itsforward end and is formed at its rear end with .a fork 27, one fingerl of which enga es under the right hand pin 14 and the ot 1er linger of which engages over said pin. The downwardly and forwardly extending arm of the shifting and locking lever 24 is provided forward endand is provided at its rearend with a ksingle linger 29 which engages over the left hand pin 14. A stiff coilspring atV its upperend to lever 24 just forward of the finger 29 and extends downwardly and forwardly therefrom with its axial line par-- allel with the direction of motion ofdth` a its lower end to a forwardly extending {inger 31 formed on'the lower end-of the left hand bracket 6. The spring is normally under tension and is sutliciently strong or stiff to maintain the finger 29 in engagement with the'left hand pin 14 when the platen support is in lower case position and during movement of said support to upper case position. In other words` said spring is made of such -strengththat whenever the key 28 or key 36 is depressed in operation of the machine the shiftable carriage support and the parts thereon will be moved from lower case position to upper case posi- 'tion through the `medium of the lever 2 4 21 engage stops pressure on the and said spring, without said Spring yielding at any time to permit separation of the Vfinger 29 and itsassociated pin 14, until stops '22. Continued downward key on leverl 24 will then cause a slightstretching of the spring and until this s secured by a slight seplaration of finger 29 from pin 14 -`ght excess 24 is arrested by a laterally lug 32 on theflower end'of y a screw 34 to the key lever comb 35 which is mounted on the main rame of the,` machine.4 The forwardarm of lever 24 is arranged to engage said stopl lug .when

extending stop a stop bar 33 24 is shown locked with 30 -is connectedy edge of the .section by suitable hinge means is provided at the llo movement ofthe lever depressed'a slight distance (approximately 31E inch) after stops 21 and 22 come into engagement to prevent nnduemovement of thelever but permit suiliclentexcess motion lthereof to allow engagement of the lock nose 38 under# lock plate 39' with spring' 30 stretched slightly more than normally and finger 29 free of pin 14 to insure asegure locking of the partsv 1n uppercase position, as hereinafter described, and with-fleyer 24 spaced slightly above stop 32. Afsinilar stop devicer (not shown) is provided for the temporary sive springing of said lever. The shift lever its key-carrying end in depressed'position in Fig. 1. This shift lock device comprises the shift-lock key 36 mounted on the upper end of agkey stem 3 which is provided forwardly extending locking lug or nose 38 shift lever 23 to prevent execslillat its lower end with the adapted to be rocked under the lower edge of the downwardly and rearwardly inclined lock plate 39 formed on a bracket 40 secured tothe main frame of the machine, as above described, after the platen reaches upper case position. The key stem 3T is formed with a forwardly extendingarm 41 pivotally held to the lever 24at 42, and said light, coil return-sprig 43 connected at its upper end to the lever 24 and at itslower end to said key stem, a stop lug 44 on the arm 41 normally abutting against the rear shiftkey 28 as shownin Fig.. 3.- The lock may be released by'pressing' down on key 28, whereupon spring 43 will release the latch.`

, A carrying case is provided for the machine comprising a base section 45 and a cover section' 46, said case being provided with a suitable handle 47 and the cover section of the casebeing hinged to the base 48. A suitable lock, not shown, forward end of the case for locking the cover in closed position. When it is' desired to enclose the machine within the case, the

machine` is placed in an u right position in in) i 4stem is. normally held in upright position bya lim the-base member'45 and t e carriage is positioned substantially midway the length of its travel as is usual in encased -portable typewriting machines. In order to keep the dimensions of the case within the lowest possible limit thedepth of the case is made such that the cover member 46 can only be fully closed when the platen carriage is in lower case position.' It frequently happens,-

howev'er, that operators of portable typewriting machines will force down the case coverwhile the. platen carriage is locked in'upper case position, jury to the case Vshift mechanism. With the case shifting and locking mechanisms constructed as above described, the cover member may be fully closed without 'releasing the thereby causing 111-' A:is

' .said lever and support of sutlicient 'strengt Shia ik 'withbui causing any damage Ato the shifting mechanism, the spring yielding unde'r the-abnormal pressure applied tothe shift frainein closing the cover to permit the platen carriage to `move down to lower case position, as shown in Fig. 2. The

trated in the drawings is or more brackets .49 0f: l the depending arms of which are provic ed cover member. of the enclosing casing illusprovided with one with rubber cushions or bumpers l adapted is swung downwardly over the machine with ofthe yieldablec'fnnection between the shift to engagetlie platen roller` 3, when the cover the platen carriage locked in upper case position, to force the platen carriage and its le ver 24 and the shiftable carriage support,

und to thefact that stops 19. aiidf20-are arranged to engage each other -before the upper edge of the forward arm .of lever i ,tion wither. rlield depressed, a shift loc device for lock.- ing the key lever with its key-carrying end vkey lever, means lever intermediate its ends, `an abutment shifting with said end of said lever 24 reaches .the upper end of its guide slot in the comb 3 5, the spr' 30 will only exert a lifting action on thflaniift frame during downward movement of the' key 28 or key 36 notwithstanding the fact that' it is normally under tension. arrangement of the spring 30, the rear' arm of lever 4 24 and the ivot- '25, the line of pull .on 'said spring, w on lever 24 is depressed is at all times sub'- stantially axially of sai spring'and parallel with the line of .movement of the shift frame.. .Whatlfclaimimv 1. In a typewriting machine, the' combination of a shiftable platen support, a shiftl pivotally supporting said support engaging the rear in such manner as to rock the key-carrying end o f the lever downward .when the support moves to upper case position' and move away from said lever when the s pport is vforced to normal posi-v key carryin end ofthe lever depressed, and yieldable means connectin to maintain said lever and abutment in en gagement during movements of the platen support fromlower to upper case position lill .but adapted, under excessive thrust transmitted to thejsuppofrt when. in upper .case

- support tgnorinalfcase position, to yield sufinverted U-sha e,

The cushions-'50 and the brackets platen carriage Owing to the relative en either of the-keysv machine having a of an enclosing case therefor having a cover tion by the cover while -j Aposition in a direction tending to-restore said to lower case .position.whilethe key lever remains locked.

2. The combination with a typewriting machine having a shiftable platen carriage,-

having a cover4 of an enclosing case therefor closable only when the carriage is in lower 'case position, a shift key lever, a shiftable support for the carriage, a spring connecting said lever with said'support for moving' .the carriage to upper case position when the ke carrying end o fsaid leve'ris depressed and a shift lock device for locking the key carrying end of said lever depressed, said spring being adapted to yield sufficiently, to permit forcing of the platen carriage to lower case position throughfthe medium L u 3. The combination with al typewriting machine haviiiga shiftable' platen carriage,

of an enclosing case therefor having a cover closable only when the carriage is in lower case position, a shift key.v lever, a shiftable support forI the carriage, a spring connectver with said supporttor moving ing said le the carriage to upper case position when the keycarrying end of said lever is depressed, a shift lock device for locking the key carrying end of said lever depressed, and means for normally maintainingjsaid spring under tension, sa id spring being constructed and arranged to yield suiiicie'ntly to permit forcing of the platen carriage to lower case position through the medium of said cover while said lever is locked witlrits key depressed. L i

4. The combination with va typewriting shiftable platen carriage,

closable only when the carriage is in lower 'caseposit-ion, a shift key lever, a shiftable support for the carriage, stops for arresting the support in upper case position, a coiled spring connecting said lever with said sup-y lever after engagement of said sto s, and means for normally maintaining sai under tension sullicient to move the shi table partsv without additional stretching of the spring until saidstopsengage,- said. spring being yieldable under-key. pressure after enranged to `:ing of the platenfcarriage to lower case posithe lever is locked.'

platen support', a key latch upon additional depression of the key-carrying endj'of they 5. In a typewriting machine, ashiftable lever for shifting said spring gagement 'of the stops-topermit locking of 4 `the lever andalso being constructed vand 'aryield sutliciently to perinit foresupportfpivotel intermediate its ends, a

coiled pull-spring connecting said lever back of its pivot tension to move the support to upper case position withoutyielding and normally prelifting connection support, and

venting 4said spring from exerting an effective pull on the support, and a shift lock de vice vfor locking said lever with its key depressed. Y i

6. In a typewriting machine, an`upwardly shiftable platen carriage support, a shift key lever pivoted intermediate its ends, an abutment 'shiftin with said support and engaging under t e rear end-of said lever, a coiled spring connected at its upper end with said lever and at its lower end with said4 suppprt and forming the sole' supportbetw'een said lever and a shift lock for locking said key lever with its key depressed, said spring being under sufficient tension to hold said leven against said abutment during uppercase-shift movements of the carriage support. 7, In a typewriting machine, an upward- -ly shiftable platen carriage support, a shift key lever pivoted intermediateits ends, an' abutmentf shifting with said support an engagingunder the rear end of said lever,

with its key depressed,

p positively connecting Vone required to move the sup the carriage l platen support,

` engagedby the la'st-iiienttmel I a coiled spring connected atits upper vrend with said lever and at fits lower en with said support and forming the sole supportllifting connection between said lever and support, a latch' carried'by the forward end of the key lever for locking said key lever a fixed abutment adapted to lbe engaged by said latch after movement of the key lever in excess of that port to upper case position, said spring belng under sufficient` tension to hold said ever against said abutment during upper case shift movements of 'support' but adapted to yield under excessive strain after the support reaches upper case position, means for arresting the carriage support in upper case position, and means for arresting depression of the key-carrying end of the key lever -when he same is depressed beyond. the point necessary to permit engagementl and release of the latchm- 8. Ina typewriting machine, a shiftable a pair of shift key llevers ypivoted intermediate theirl ends, means lever adjacent its rear. end'with the support, a coiled supportshifting spring connecting the other .lever adjacent its rear end with the support to move the supportatol upper case position when the key on said lever is depressed,

means shifting with the sup ort normally lever t0 mainnectlon vtaining said vspring tain said spring under constant tension, lower case stop means for arresting the support in upper case posltion, means for preventing undue depression of the key carrying end which) said spring is connected, and a shift lock device for locking its key-carrying end depressed.

9. In a platen carrlage support, a shift-key vlever fulcrumed on a stationary part of the machine, a helical pull spring directly connected at opposite ends thereof with said support and key lever to form a draft contherebetween for shifting the 'support to upper case position when the key'- for the support, means of the lever with the latter lever with typewriting machine, la shiftablc sov carrying end of the lever is depressed, said spring being arranged with its axial line substantially parallel with the direction of movement of the support and the line. of-o pull' of the key lever on the spring, and means for locking the shift-key lever with its key-carrying end depressed. 10. In a typewriting machine, carriage, a support forpthe carriage shiftable. diagonally upward and rearward, means for guiding-the support, upper and lower case stop devices movements of the support, a 'pair of upwardly arched shift key levers, means pivotally supporting said levers substantially at the top of the arch to rock down inplanes extending fore-and-aft. of

I a A platen so for limiting. shifting up and the machine, means posi-tively connectmg the support with the rear end of one lever, a helical Vsupport lifting spring connected with the rear` arm of the other lever'at its upper end and connected at its lower end with said support, said spring extending substantially parallel with the direction of `shifting movement ofthe support, means shiftable 'with' the support engaging under the rearfend `of the latter lever and main.- under tension, and a shift 'lock device -for locking the latter lever with its key carrying end depressed.

11. lIn a typewriting machine, the combination of a main frame, a platen carriage, an upwardly shiftable support for the carriage, means for said support, a transverse rock shaft journaled in. said frame, a pair .offorwardly extending rock l arnson 'said shaft at opposite sides -oflthcmachine, a pair of i transverse pins connecting\ the support with the forward ends of the rock arms, a temporary shift'key lever fulcrumed on the mainframe at one side of the machine intermediate its. ends and provided with superposed fingers at its rear end between whi h one of said pins extends,fa shift and lock key leverI fulcrumed on the main' frame intermediate its ends at the .opposite side of the machine y and pro-' end with-a single finger en-v4 vided at its rear.

gaging over the other one di vsaid pins, a

normally holding said single finger on the shift and lock lever in engagement with the adjacent pin with the springunder tension7 and cooperating means on the shift and lock lever` and the main frame for locking said lever with pressed.'

its forward end de- `10 In testimony whereof I hereunto flx4 my signature.

HENRY ALLEN AVERY.'

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