US1767878A - Typewriting machine - Google Patents

Description

June24, 1930. G. 5. GOING TYPEWRITING MACHINE Filed May 28, 1929 WITNESSES 2 Sheets-Sheet 1 ATTORNEY June 24, 1930. G. a. some TYPEWRITING mourns:

Fil ed May 28, 1929 2 Sheets-Sheet 2 'WITNESSES I ATTORNEY j Patented June 24, 1930 UNITED STATES PATET oFFICE GEORGE G. some, or STAMFORD, connncr cur, ASSIGNOR To nnivimeron'rxrn- I WRITER COMPANY, or ILION, NEW YORK, A CORPORATION or'nnw YORK 'IIYPEWRQITING MACHINE Application filed May 28, 1929.

My invention relates to typewriting and like machines .and more particularly to the case shift mechanism thereof.

The main object of my invention, generally stated, is to provide a noiseless, simple, inexpensive, compact and highly eflicient means for preventing a rebound of the case shift part, more particularly its return to normal position. i v

To the above and other. ends which will hereinafter appear, my invention consists in the features of construction, arrangements of'parts and combinations of devices set forth in the following description and U particularly pointed out in the appended claims.

In the accompanying drawings, wherein like reference characters. designate corresponding parts in the different views,-

Fig. 1 is an enlarged, detail, fragmentary, side elevation, with parts in section, disclosing enough of the typewriting machine to illustrate my invention in its embodiment therein,-said view showing the parts as they. appear when the carriage is in the lower case position. V

Fig. 2 is a view that corresponds substantially to Fig. 1 except that the parts are shown as they are disposed when the carriage is shifted to upper case position.

I have shown my invention embodied, in the present instance, in a noiseless portable typewriting machine of the character disclosedin my application Serial #331,534,

, filed Jan. 10, 1929 in which the devices of the present invention may be readily incorporated without modifying the existing structural features of said machine. It should be understood, however, that the invention is not restricted in its use to any particular character of typewriting and like machine, but may be employed in such machines generally, wherever found available. In fact the nature of-the invention is such as to enable it to be readily incorporated, as

erial No. 366,623.

an attachment, in typewriting machines that vary materially in character.

In the accompanying drawings I have shown only so much of the typewriting machine as is necessary to illustrate my present invention in its embodiment therein.

The present invention is in the nature of machine and has fixed thereto near each end a crank arm 5. A counter balance spring 6 for the case shift mechanism surrounds the rock shaft 41, said spring being secured at one end, as at 7, to the casting 2. The

opposite end of the spring is connected to a collar 8 that is adjustably connected to the rock shaft 4 to adjust the tension of the spring on the case shifted parts. Each of the parallel arms 5 is pivoted at'9 to a depending bracket arm 10 on the case shift frame which in the presentinstance is in the nature of a carriage support indicated as a whole by the reference numeral 11.

The carriage support 11 extends from side-to-side of the machine and has oppositely disposed grooved race-ways 12 therein to receive crossed rollers 13 which also are received in oppositely grooved race-ways 14 in a cross bar 15 of the carriage to which end plates 16 are secured at 17. The carriage, which carries a cylindrical platen 18, is thus mounted to travel from side-to-side of the machine on the carriage support 11 and is adapted to shift up and down with said support in the case shifting movements of the latter; I

To further guide. and control the carriage in its case shifting movements I provide a cross bar 19 secured at its ends by screws 20 to the end plates 16 of the carriage. The rear casting 2 of the frame at about midway in the width of the machine has a guide plate 21 secured thereto by screws 22. The cross bar 19 is free to travel with the carriage across the face of the guide plate 21 and also to slide up and down thereon when the carriage receives a case shifting move-v ment. I employ suitable means, not shown, but which are disclosed in my said application Serial #365,426, for retaining the carriage against forward displacement from the guide plate 21 without interfering with the travelandrase shifting movement of the is. provided with an opening 28., the walls of which engage three sides. of a rock shaft 29 which is. square in cross section. The lever 26 is formed with an offset ear 30 that underlies. the. rock shaft 29 and is secured thereto by a headed screw 31. In this manner the lever- 26 and the rock shaft 29. are connected to rock together- Said rock shaft extends from side-to-side of the machine and is mounted at its ends on pivot screws 32 carries by the side plates 1 of the frame. At the left-hand side of the machine there is provided a second case shift lever or arn; 33 provided with a finger key 3%. This lev er arm 33, is connected to the. rock shaft 29 in the same manner as the lever 26, but

1 of the frame.

In order to limit the case shifting movements of the frame 11 to and from normal position I provide stops at both sides of the machine. In the present instance each of the stops for limiting the upward motion of the shift frame is designated as a whole by the. reference numeral 37. Each of said stops is secured by screws 38 to the casting 2 and comprises a metal plate 39 beneath which is a l yer of felt 4-0. The felt is covered by a very thin metal plate 4C1 bent at its ends, at 4L2, around the ends of the plate 39 and the intervening felt l0 and securing the latter in place on the stop plate 39. The thin plate 411 constitutes a contact face with which the carriage support 11 coacts to arrest the upward shift movement thereof. The stock from which the plates 39 are made is such that a slight bend may be given the stops to adjust them. his construction provides for substantially noiselessly arresting'the carriage in its upward shifting movements.

For arresting the return movement of the carriage, screw stops 48 are received in tapped openings in ears 44 on brackets d5 secured by screws al6 to the side plates 1 of the frame. The lower ends of these brackets 45 are supported on the forwardly extending arms 47 of the casting 2. Lock nuts 4L8 may be employed on the screw stops 43 to hold them against accidental displacement from their adjusted positions. 'As shown in Fig. 1 the case shift frame 11 bears against the heads of the screw stops 4;?) and limits the return motion of said frame to normal position.

It should be understood that so far as the present invention is concerned it is immates rial what character of stops are employed for arresting the case shift frame.

Coming now to the means for preventing a rebound of the shift frame from normal position, which constitutes the important feature of the presentinvention, it will be seen that I have provided a detent device in the nature of a lever 49 of'the third order. This lever is carried by and pivoted, at 5 0, on the case shift lever 26 to have a bodily movement therewith and also have a pivotal movement thereon. The upwardly and rearwardly extending arm of this lever carries a double detent roller 51 pivoted thereon at 52. In some instances, however, it may be found desirable to fix this so-called detent roller against turning movement. This roller is adapted to enter the space between the forwardly and upwardly inclined part of the carriage support 11 and the upper flattened edge 53 at forward end of the arm 5 when the parts are in the normal position, as shown in Fig. 1. The effect of forcing the roller 51 into the position shown in Fig. 1 is to exert a wedging action on the parts with which the roller coacts, tending to force the case shift frame to return to normal position and also maintaining the roller 51' extended end of the pivot 9. The force of 49 on its pivot 50 and force the detent roller thereon into effective wedging position shown in Fig. .1. It should be understood that the spring 54 is lighter than the spring 35 and cannot overcome the force of the latter.

' The forward arm of the detent lever 49 carries an off-setfiange 56 that overlies the case shift lever 26. This flange is tapped to receive a screw stop 57 adjustable up and down on the flange 56 and adapted to coact at its upper end with a fixed part 58 of the machine, which in the present instance happens to be a part of the type bar segment. A look nut 59 may be employed on the screw stop to hold it against accidental displacementfrom its adjusted position.

The construction is such that when the parts are in the normal position shown in Fig. 1, the screw stop 57 will engage the fixed part or stop 58. At this time the spring 54 holds the detent roller 51 seated against a case shiftable parts, as pointed out above, whereas the spring 35 resists the elevation of the rear end of the lever 26 and the pivotal point 50. This results in holding the case shift frame 11 and the parts carried thereby against rebound. The necessity for preventing such rebound is well understood in the art and need not be elaborated on herein.

\Vhen either of the caseshift keys 27 or 34 is depressed the rear end of the lever 26 will be elevated carrying the detent lever up bodily with it and the case shift frame while the screw stop 57 bears against the stop 58. This will result in positively turning the detent lever on its pivot 50 against the force of the spring 54 and in carrying the detent roller51 out of contact with the parts with which it coacts. From a com parison of Figs. 1 and 2 it will be seen that as the carriage is shifted from the lower case Fig. 1 position, to the upper case Fig. 2 position, the forward end of the arm 5 and the carriage support 11 approach each other and close or contract the space in which the roller-51 is received when theparts are in the lower case position. However, as the roller 51 is positively withdrawn from between these parts in advance of their approach towards each other, said roller does not interfere with the case shifting move ment of the case shift frame.

As the parts return to lower case positiontween the lever 26 and the case shift frame.

This I do by enlarging the opening vertically in the rear end of the lever 26, as indicated at 60, where the pivotal connection, at 25, is effected between said lever and the link 24. This enables a preliminary lifting of the detent lever 49 at the first portion of the depression of either shift key, and before any motion is transmitted to the case' shift frame and the parts carried thereby. An upward shift of the pivot 50 at this time results in turning the detent lever on its pivot 50 since the screw stop 57 is held against the part 58. It follows that this will result in a partial withdrawal of the detent roller 51 from its engaged position before motion is transmitted to the case shift frame 11.

It will be understood that the features for preventing rebound of the carriage offer but little resistance to the case. shifting movement of the carriage to the upper case position, which in itself is an important factor.

From what has been said it will be seen that I have provided simple and effectlve means for preventing a rebound of the carriage from normal, lower case, pos tion in returning the carriage to such pos tion, the simple addition of the lever 49 attainmg the ends pointed out.

Various changes in the construction may be made without departing from my invention as it is defined in the accompanying claims.

\Vhat I claim new and desire to by Letters Patent, is: v

1. Case shift mechanism for typewriting and like machines comprising two members that have a relative movement one towards the other as the case shifted part moves away from normal position and have a relative. movement one away from the other as the shifted part returns. to normal position, a detent, spring means for forcing said detent into wedging engagement with and between said members as the case shifted part returns to normal position and thereby prevent a rebound of said part from such normal position, and means for positively withdrawing said detent from such wedging engagement when the case shifted part is moved away from normal position.

2. Case shift mechanlsm for typewriting and like machines comprismg two members that have a relative movement one toward the other as'the case shiftedpart moves'away from normal position and have a relative movement one away from the other as the secure that have a relative movement one towards the other as the case shifted part moves away from normal position and have a relative movement oneaway from the other as the shifted part returns to normal position, a detent, spring means for forcing said detent into wedging engagement with and between said members as the case shifted part returns to normal position and thereby prevent a rebound of said part from such nor mal position, means for positively withdrawing said detent from such wedging engagement when the case shifted part is moved away from normal position, a case shift key, and a lost motion connection between said key and-said case shifted part that enables a movement of said detent out of engaging position to be eflected before motion is transmitted from'said key to the case shifted part. 4. Case shift mechanism for typewriting and like machines comprising two members that have a relative movement one toward the other as the case shifted part moves away from the normal position and have a relative movement one away from the other as the shifted part returns tonormal posi tion, a detent, and automatically operating controlling means for said detent that enable thedetent to be wedged'into position between said members as the case shifted part returns to normal position and thereby prevent a rebound of said part from such position, and which enables said detent to be positively withdrawn from obstructing position between said members as the case shifted part is moved away from normal position, said automatically operating controlling means comprising a stop with which said detent coacts in the normal position of the parts ready to positively withdraw the detent, a spring which tends to force the detent into engaging position, and a lost motion connection that enables a preliminary movement of the case shift key to start a positive withdrawal of said detent with the aid of said stop before motionis trans mitted to said case shifted part.

5. Case shift 'mechanism for typewriting and like machines comprising a key actu ated case shift lover, a detent lever pivoted on said case shift lever and which normally extends into the path ofa case shifted part,

a spring which tends to force the detent lever into such position, a stop carried by a fixed part of the machine and with which said detent lever coacts to effect a movement thereof around its fulcrum and against the force of said spring to releasing position when the case shift lever is actuated, and a lost motion connection between said case shift lever and the part to be given a case shifting n'rowement in order to positively effect a preliminary movement of the detent lever towards releasing position under control of said stop.

6. Case shift mechanism for typewriting and likev machines comprising a key actuated case shift lever, a detent lever of the third order carried by and pivoted on :said case shift lever and one arm ofvwhich coacts with a case shifted part to prevent a rebound thereof from normal position, a spring which forces said detent lever to effective position, and an adjustable stop carried by said detent lever and coacting with a fixed part of the machine when the parts are normal position in order to positively withdraw the detent lever from contact with said ficase shifted part when the case shift lever is actuated.

'7, Case shift mechanism for ty writing and like machines comprising a li y actuated case shift lever, a detent lever carried by and moi'm'ted for pivotal movement on said case shift lever and cooperative with a case shifted part to prevent rebound there of from normal position, a spring which moves said detent lever to effective position, a stop which coacts with said detent lever when the par-ts are in normal position to compel a movement of the detent lever around the point of its pivotal connection with the case shift lever and thereby positively withdraw said detent lever from effective engagement with said case shifted part when the case shift lever is actuated, and a lost motion connection between said case shift lever and the case shifted part, whereby a preliminary movement of the case shift lever may be effected independently of the case shifted part in order to start to positively withdraw the detent lever under control of said stop before motion is transmitted to the case shifted part.

8. Case shift mechanism for typewriting and like machines comprisinga case shift frame, parallel arms on which said frame is supported, the construction and arrangement of the parts being such that the free end of one of said arms approaches the,

case shift frame as the latter is moved from normal position, a detent lever carrying an anti-friction roller, a case shift key, and automatically actuated controlling means cooperated with said detent lever for wedging the said roller thereon betweenthe case shift frame and one of said parallel arms when said frame returns to normal position and for positively withdrawing the roller from such wedging position when the case shift frame is shifted from normal position, said controlling means comprising a spring for moving said detent lever to effective position, and a stop with which said detent lever coacts to effect a positive withdrawal thereof from effective position.

9. Case shift mechanism for typewriting and like machines comprising a case shift frame, parallel arms on which said frame is supported, the construction and arrangement of the parts being such that the free end of one of said arms approaches the case shift frame as the latter is moved from normal position, a detent lever carrying an antifriction roller, a case shift key, a spring acting on said detent lever for wedging the said roller thereon between the case shift frame and one of said parallel arms when said frame returns to normal position, a stop tion and which when the case shift lever is actuated holds one end of the detent lever while it is being given a bodily movement with the case shift lever, thereby positively withdrawing the detent lever against the force of its spring from the path ofsaid part with which it coacts.

Signed at Stamford, in the county of Fairfield and State ofConneoticut, this 27th day of May, A. D. 1929.

GEORGE G. GOING.

with which said detent lever coacts in the normal position of the parts for positively withdrawing said roller from wedging engagement when said case shift key is actuated, and a lost motion connection between said case shift key and frame, whereby said key may receive an initial movement independently of the case shift frame in order to release the wedged roller from locked engagement before the case shift frame is shifted.

10. Case shift mechanism for typewriting and like machines comprising a case shift frame, parallel arms on which said frame is supported, the construction and arrangement of the parts being such that the free end of one of said arms approaches the case shift frame as the latter is moved from normal position, a detent lever carrying an anti-friction roller shiftable into wedging engagement between said shift frame and one of said arms when the case shift frame returns to normal position, a case shift key lever by which said detent lever is carried and on which it is pivoted, a spring by which said detent lever is moved to effective position, and a stop with which said detent lever coacts in order to force the roller out of said wedging position when the case shift frame is moved from normal position.

11. Case shift mechanism for typewriting and like machines comprising a case shift frame, a key actuated case shift lever, a detent lever mounted for bodily movement with and for pivotal movement on said case shift lever, a spring for moving said detent lever around its pivotal connection with the case shift lever and into the path of a part mounted to shift with the case shift frame and prevent said frame from rebounding from its normal position, and an adjustable stop with which said detent lever coacts when the parts are in normal posi-v

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