US1929992A - Casing for typewriters - Google Patents

Description

Oct. 10, 1933. G. J. RUNDBLAD CASING FOR TYPEWRITERS Filed March 11, 1929 6 Sheets-Sheet l Cd. 10. 1933. G BL D 1,929,992

CASING FOR I'YPEWRITERS Filed March 11 1929 6 Sheets-Sheet 2 d- G. J. RUNDBLAD CASING FOR TYPEWRITERS Filed March 11, 1929 6 Sheets-Sheet 3 Oct. 10, 1933 G. J. RUNDBLAD CASING FDR TYPEWRITERS Filed March 11, 1929 6 Sheets-Sheet 4 Oct. 10, 1933.

G. J. RUNDBLAD CASING FOR TYPEWRITERS Filed March 11 1929 6 Sheets-Shea I 5 0ct. 10, 1933. a. J. RUNDBLAD CASING FOR TYPEWRITERS Filed March 11, 1929 6 Sheets-Sheet 6 Patented Oct. 10, 1 933 4 I p r I Q UNITED STATES PATENT OFFICE CASING FOR TYPEWRITERS George J. Rundblad, Woodstock, Ill., assignor to Woodstock Typewriter Company, Woodstock, 111., a corporation of Illinois Application March 11, 1929. Serial No. 345,935

18 Claims. (01. 217-) This invention relates to mechanism for enclos- The housing A comprises the base member 1 ing a typewriter and has for one of its objects, with an upstanding portion 2 which comprises the provision of means to deaden the sound inthe lower or stationaryrpart of the housing. A

P cident to the operation of the typewriter. two part closure is provided for the housing Another object of this invention is to provide A. This consists of a member 3 pivoted at 4 60 means which will keep out dust and dirt from to the upstanding portion 2. Member 3 normally the typewriter and therefore increase its cfilis closed, as shown in full lines in Fig. 1, and ciency and extend its usefulness. 7 has pivoted theretoat 10 a cover ,5 which, in

Another object of the present invention is to the use of this device, is the part of the closure r provide means for making the typewriter readily normally opened and closed so as to permit in- 5 accessible when it is desired to remove the paper spection of the work, removal thereof, or for from the platen, or'to adjust the tabular stops, any similar Ipurpose. When the machine is in or for any similar purpose. operation, these parts are in'the, position shown Other objects of the invention will appear herein full lines in Fig.1, and the cover 5 may be inafter, the novel features and combinations bemoved to the dotted line position E, or both ing set forth in the appended claims. the members 3 and 5 maybe moved to the dotted In the accompanying drawings: line position F, by suitable mechanism which will Fig. 1 is a sectional elevation of one end of a hereinafter be described. I housing embodying my invention, taken on the In the front part of the casing, A is a slot-'7 line 1-1 of Fig. 2; through which ,theline spacing lever D is adapted Fig. 2 is a front elevation with parts broken to project and since this lever travels longitudi-' away for clearness and illustration of certain nally of the housing as the typewriter is being mechanisms; I operated, the slot is elongated as shown in Fig. Fig. 3 is a fragmentary plan viewof the mecha- 2 and is provided with flexible strips 8 and 9 nism for operating the cover for the housing; i on either side thereof toprovide a means for Fig. 4 is a section onthe line 44 of Fig. 3; closing the slot except for the place where the Figs. 5 and 6 are sections on the lines 5--5 an spacing lever D happens to be located. The

6-6, respectively, of Fig. 4; 1 purpose of these strips 8 and 9 is to deaden the Fig. 7 is a modification of the mechanism shown sound coming from the typewriter and they may in. Figs. 1 to 6, inclusive, taken on the line 'l-7 be made of any flexible material desired, such of Fig. 8; I as felt, fabric, rubber, or the like.

Fig.- 8 is a front elevation of the housing with The cover 5 is provided with a glass panel 6 certain parts broken away, for the sake of clearwhich permits the operator to see the work ness; at all times. i

T Fig. 9 is a fragmentary plan view of the mecha- A segmental gear 11 is fastened to the cover nism for raising the covering means for the '5 by means of rivets 12 or by any other suitable housing; fastening means and rotates therewith about Fig. 10 is a section on the line 10-10 of Fig. 8; pivot 10. A similar segmental gear 13 mounted Fig. 11 is a section along the line 1l--l1 of On t e eve 14 pivotediat 4, is adapted Fig. 9; and v v mesh with gear 11 and, when lever 14 is rocked Fig. 12 is a section along the line 12--12 of O- e dot ed e position Shown in Will Fig. 9. c y operate to rotate gear 11 and rock the cover In the use of typewriting machines, and espe- 5 to the dotted line position E. This allows cially those operated by electric motors, there is the operator to have access to the typewriter considerable noise produced incident to theopersuch as for the purpose of removing the paper 'ation thereof. The present invention aims to retherefrom, and is a sufiicient opening for the duce the amount of the noise which is audible to normal use of the machine but at other times, it the operator of \the typewriter and to those is desirable to reach other parts thereof, such around. This is accomplished by enclosing the as the tabular keys on the back of the typewriter. typewriter in a sound-deadening chambergener- When the operator desires to have access to ally denoted as Ain the drawings. The typewriter more of the typewriter than is permitted by the .B is shown in dotted lines and is entirely within movement of the cover 5 to the position E, he the housing except for the key board C thereof grasps the knob 44 fastened to the pivot 10, which projects outside of the housing, as shown and moves the pivot 10 bodilytowards theleft,

fit

in Fig. 1, forthe convenience of the operator. as shown in Fig. 1. This causes the. gear 11 to roll on gear 13 which telescopes the cover 5 within the cover 3 and at the same time moves both the cover 5 and the cover 3 to the dotted line position F. This opening movement is limited by the stop 45, shown in Fig. 2 and in dotted lines in Fig. 1, as is also the normal opening of the cover 5. It will readily be seen therefore, that the operator now has access to the back part of the typewriter for adjusting the tabular stops or for any other desirable purpose. Obviously, a lever may be fastened to cover 3 to take the place of knob 44.

The normal operation, however, contemplates moving only cover 5 to the dotted line position E and this necessitates some simple and efficient means for rocking the gear 13 about the pivot 4. For this purpose, a link 15 is pivotally connected to the lever 14, supporting the gear 13, and. is pivotally connected to a crank disk 16 at 17. A stud 18 is fastened to support 20 and is used to rotatably support the "disk 16. Therefore, it will be seen that when the disk 16 is rotated through 189 from the full line position to the dotted line position, in Fig. 1, the gear 13 will be rocked to open the cover 5. By moving the crank disk 16 through another 180, the cover 5 will be closed.

To move the crank 16 in: the manner heretofore described, interconnected gears 19 and 21 are provided, the latter having means to actuate it. Gears 19 and 21 are in the ratio of 1 to .2. Therefore, it is only necessary to give a quarter revolution to gear '21 to move gear 19, and, consequently, crank disk 16, through the desired angle of 180.

Of course, it is necessary that the gear .21 be operated through a full quarter of a revolution and no more or less in order to insure the proper operation of the crank disk 16. For this purpose, gear '21 is mounted on the hub 26 which is free to rotate on shaft 25 and has a pawl 23 pivoted at 24 adapted to engage a ratchet 22 fastened to rotate with shaft 25. Thus, it will be seen that if the shaft 25, is rotated in a clockwise direction, as shown in Fig. 1, the gear 21 will be caused to rotate therewith. Since it is desired that only a quarter revolution be given to the shaft 25, the ratchet 22 is provided at one end thereof with a member 33 fastened thereto and having arms 36 and 35 adapted to engage a pin 34 mounted on the stationary frame 20 used to support the shaft 25 and its associated mechanisms.

These steps 35 and 36 are arranged so that only a 90 revolution may be given to the ratchet member '22. Obviously, however, different gear ratios between gears 19 and 21 may be used and the steps 35 and 36 may be set so that ratchet 22 may be given more or less rotation than that illustrated, as may suit the requirement of the particular machine.

It will be seen that by the mechanism just described, when the lever 43 is rotated in a clockwise direction, as shown in Fig. 1, that the ratchet, and, consequently, gear 21, will be rotated therewith through an angle of 99, causing the segmental gear 13 to move from the full to the dotted line position. This opens the cover 5, and, to close it, another quarter of a revolution must be given to the gear 21. This may be done by bringing the lever 43 to its original position. This also rotates the ratchet 22 and the member 33 to their original positions and the gear 21 cannow be given another quarter of a revolution to close the member 5.

While the movement of the handle 43 to its original position may be accomplished manually, it is preferred that some automatic means be used for this purpose. To this end, the shaft 25 has rigidly connected thereto a member 28. This member is yieldingly engaged by a member 29 loosely mounted on the shaft 25 and both the members 28 and 29 are provided with serrated faces to cause them to rotate together while permitting them to be separated and locked in various angular positions relative to each other. The purpose of this is to tension a coil spring 30 having its opposite ends fastened in the rigid framework 20 and in the member 29 at 31 and 32 respectively.

The member 29 is rotated in such a direction as to coil the spring 30 and give to it a tension which has a tendency to rotate the shaft 25, and, consequently, the lever 43, in a counter-clockwise direction, as seen in Fig. 1. Thus, after the handle 43 has been used to either open or close the cover 5 by rocking it in a clockwise direction until the member 36 engages the stop '34, the spring 30 will operate to return the handle 43 to its original position when released by the operator.

The operation of this device should .be apparent from the description thereof but a brief summary of its operation will now be given. When it is desired to move the cover 5 to the position E, the lever 43 is rotated in a clockwise direction until the stop 35 engages the pin 34. The gear 21 simultaneously rotates therewith as does also the member 27, due to pawl 23 engaging the ratchet 22. To insure the holding of the cover in. open position and also to insure the holding of the cover in closed position, I have provided the detent mechanism shown in Fig. 5. At each cover opening position and at each cover closing position the gear 21 shown in 1 and 4 will be rotated through only 90". The disc 27 shown in Figs. 4 and 5 is secured to the hub 26 and is provided with notches 42 spaced 90 from each other around the circumference thereof and these notches are adapted to be engaged by a roller 39 rotatably mounted on the end of the detent arm 3'7, which in turn is pivoted at 38 to an upstanding ear 41 on the framework 20. The detent arm 37 is spring-pressed into engagement with the disc 27 by a spring 40. It will thus be seen that when the roller 39 rests in the notch 42, the cover 5 will be retained in its closed position when moved to the latter position and that the cover will also be held by the mechanism shown in Fig. 5 in its open position when moved to such position.

When the lever 43 has been rocked until arm '35 comes into engagement with stop 34, the roller 39 will be in engagement with one of the notches 42 to hold the hub 26, and, consequently, the shaft 18, from rotating. The spring 30 will now return the lever 43 to its original position when released by the operator. The gear 21 operates the gear 19, which, in turn, rotates the crank disk 16, and this, in turn, rocks the gear 13 through the intermediate lever 15 and link 14. Movement of the gear 13 to the dotted line position causes the cover 5 to rock on its pivot 10 to the dotted line position E. A similar operation to that described for opening the cover 5 will now close it in the manner previously described.

In the modification shown in Figs. '7 to 12, inclusive, the members 51 to inclusive, are similar to parts 1 to 15, inclusive, and A, 13,0 and D indicate similar parts to A, B, C and D, of the embodiment shown in Figs. 1 to 6, inclusive, and operate in the same manner, but a different mechanism is used to set in motion the lever 65 for operating the cover. In this case, a power actuated mechanism is provided in place of the manual means used in the modification previously described. 1 Thecrank disk comprises a drum 66 mounted on shaft 69 and secured thereto by a screw 68 screw-threaded in the. end of the shaft 69 and abutting against the hub 74 of the drum. Ar-

ranged interiorily of thedrum is a spring 70 secured at its outer end by means of a lug 71 projecting through a hole in the spring. The inner end is similarly secured at 72 to the hub portion 73 of the member 75. The drum is connected to the lever 65 by the crank pin 67.

The tension of the coil spring within the drum 66 causes the drum, and, consequently, the pin 67, to be rotated in a clockwise direction, as seen in Fig. 1. This movement operates the lever 65 in the same manner as lever 15 is operated in the embodiment first described. To regulate the drum 66 so that it will rotate only through 180 at each operation thereof, lugs 77, and 78 are provided about the periphery thereof with their forward faces arranged at 130 from each other. a A dog 79 rigidly fastened to a rod 80 is adapted to alternately engage lugs 77 andfi78 and thereby stop the rotation of the drum 66 after it has rotated through 180", to either open or close the cover 55. The dog 79 is kept from rotating by a projection 81 on the'opposite end thereof engaging a rod 82 supported by an inverted U-shaped portion 92 of the support '20.

The lugs 77 and 78 are staggered in adirection longitudinally of the axis of the drum'so that when the dog 79 is in the position shownin Fig. 12, it will engage one of the lugs, for instance, lug 78, and when shifted to .theleft, will engage the other of said lugs 77 whenthe drum rotates through 180". Therefore, it will be seen that by alternately shifting the rod 80, upon which the dog is secured, the drum 66 will be rotated to first open and then close the cover 55.

A roller 85 on the lever 86 pivoted at 88 to the member 20, is adapted to engage notches 83 and 84 in the rod 80 to thereby hold the rod either to the right, as shown in Fig. 12, or its alternate position to the left, as has been described. A spring 87 yieldingly urges the roller 85 into en- 'gagement with the notches 83 or 84.

After the spring '70 has been used to some extent for opening and closing the cover 55, it is necessary to again tension the spring, and, for this purpose, the continuously rotating shaft 69 is provided with a ratchet 107 normally rotating freely within themember 75 but adapted to be connected thereto by a pawl 100 engaging the ratchet. When the pawl 100 engages the ratchet 107, the member 75 is caused to rotate therewith and wind the inner end of the spring 70. To re- 1 providing members 103 and 104 adapted to engage opposite sides of the spring 70.. When the spring has been tensioned, the lever 101 is rocked counter-clockwise, as seen in Fig. 10, because at that time, the spring is drawn inwardly toward the center of the drum and carries the end of the lever engaging the spring along with it. Conversely, when the spring has lost its tension, the lever 101 is rocked clockwise to thereby cause the pawl 100 toengage the ratchet 107, due to the fact that the outer coilof the spring now takes up a positionhear .the inner periphery of the drum. 1

"The continuously rotating shaft 69 is adapted.

to be drivenfrom a shaft 108 through a suitable coupling member 106. This shaft 108 is driven from a power means which is used to operate the typewriter B but it may be driven by any desired source of power, whether connected with the typewriter or not. Shaft 69 is kept from endwise displacement by collars 111 and 112.

The rod 80 is shifted from right to left and vice versa by means of a lever 89 which has a slot 90 therein engaging a pin 91 on the rod 80. The lever 89 is fastened to shaft 93 and is rocked thereby. The shaft 93 projects through the front part of the housing and is provided wit'na cross member 94 provided with keys 95 and 96, which, when alternately depressed, rock the shaft 93 in one direction, and then the other, and, consequently, shifts the rod 80 in a corresponding direction. The depression of key 95 shifts the rod 80 tothe right and the depression of the key .96 shifts the rod to the left.

Knob 109 fastened to pivot 60 is similar to knob 44 in Figs. .1 to 6 inclusive,v and is used to open the two-part cover to the dotted line position F, and the stop 110 will stop the opening movement of the cover55 when it has moved to the dotted line position E. Obviously, a lever fastened to the member 3 may be used in place of knob 109. Suitable designations such as C and 0 may be used to designate the keys which respectively closeand open the cover. 7 The operation of the device is asfollows:

. Whenthe device is in full line position shown in the drawings, the cover 55 is closed. To open this cover 55, the key 96 is depressed, thus rocking 2 the lever 89 to the left, as seen inFig. 8, and shifting the rod 80, and, consequently, dog 79, out of engagement with the stop 78. The spring 70 now operates through the drum 66; pin 67 and link 65 to rock the gear 63 which, because of its engagement with the gear 61, rotates the cover 55 about the pivot 60 to the position E. As soon as the drum has rotated through 180, the dog 79 comes intoengagement with the lug 77 preventing further rotation of the drum. When the key 95 is now depressed, the rod 80 is similarlyshifted in an opposite direction, disengaging the dog 79 from lug 77 and allowing the drum 66 to rotate through another 180 until the dog 79 engages the stop 78 to thereby close the cover 55.

When, after repeated use of the spring to open and close the cover 55, the'spring has become unwound, so that its usefulness is greatly impaired, the lever 101 is rocked tocause the pawl to engagethe ratchet 107 and since shaft 69 continuously rotates the ratchet 107, the member 75 'is therefore rotated and the inner end of the spring iscaused to be-wound. As

soon as the spring is sufficiently tensioned, the

pawl100 is released from the ratchet 107 until the spring is again unwound.

Thus, it will be seen that a very simple and efficient means has been provided whereby the a means for covering the typewriter may be readily moved to'such a position as to make the typewriter accessible and both manual and power actuated means have been shown whereby this may be done. The manual means is used preferably where an ordinary typewriter which does not have any power actuated shaft such as 108, is used, whereas, the power actuated mechanism is preferably employed with power actuated typewriters, but it will be understood that the spring may be tensioned by manual means either engaging the shaft 69 or part or by any other suitable means for accomplishing this result. Other means might be used for shifting the rod than that employed but the form shown in the drawings is simple and dependable and is preferred.

Obviously, those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I wish, therefore, not to be restricted to the precise construction herein disclosed.

Having thus fully disclosed an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:-

1. An enclosure casing for typewriters including a sound deadening chamber in which a typewriter is enclosed and comprising a base portion and a stationary front casing having a horizontal slot through which a line-spacing lever of a typewriter is adapted to project and to travel longitudinally during operation of the typewriter, sound-deadening means carried by the edges of the casing forming said slot adapted to engage the projecting lever to prevent the egress of sound through said slot, a panel having a transparent portion adapted normally to contact with the upper portion of said stationary front casing and adapted normally to overlie the front upper portion of said typewriter, and a rear casing adapted to enclose the rear of said typewriter and adapted to contact with the rear portion of said transparent panel, whereby wholly to enclose said typewriter, and means for shifting said transparent panel with respect to the rear casing whereby to provide an opening above the front stationary panel to give access to the work in the typewriter.

2. An enclosure for typewriters comprising a base portion and a stationary front casing having a horizontal slot through which a line-spacing lever of a typewriter is adapted to project and to travel longitudinally during "operation of the typewriter, sound-deadening means carried by the edges of the casing forming said slot adapted to engage the projecting lever to prevent the egress of sound through said slot, a panel having a transparent portion adapted normally to contact with the upper portion of said stationary front casing, and adapted normally to overlie the front upper portion of said typewriter, and a rear casing adapted to enclose the rear of said typewriter and adapted to contact with the rear portion of said transparent panel, whereby wholly to enclose said typewriter, and means for telescoping the transparent panel relatively to the rear panel, and means for shifting the rear panel relatively to the base to give access to the platen of the machine and also to the rear of the machine.

3. .An enclosure for typewriters comprising a base portion and a stationary front casing having a horizontal slot through which a line-spacing lever of a typewriter is adapted to project and to travel longitudinally during operation of the typewriter, sound-deadening means carried by the edges of the casing forming said slot adapted to engage the projecting lever to prevent the egress of sound through said slot, a panel having a transparent portion adapted normally to contact with the upper portion of said stationary front casing and adapted normally to overlie the front upper portion of said typewriter, and a rear casing adapted to enclose the rear of said typewriter and adapted to contact with the rear portion of said transparent panel, whereby wholly to enclose said typewriter, and means for selectively opening the transparent panel alone to give access to the platen, or for opening the transparent panel and rear panel to give access to the platen and to the rear of the machine.

4. An enclosing casing for typewriters having a slot in the front of said casing through which the spacing lever of a typewriter is adapted to project and to move during operation of a typewriter when arranged in the casing, said casing having a portion shiftable about a first axis to give access to a predeterminel portion of the machine, and said first axis being shiftable about a second axis to give access to a still greater portion of the machine.

5. An enclosing casing for typewriters comprising relatively telescoping parts, means for telescoping certain of said parts to give access to a typewriter when arranged in the casing, and means for shifting said telescoping parts away from the enclosed typewriter to give further access thereto.

6. A sound-deadening enclosure for typewriters comprising a stationary casing for the base and front of a typewriter, said front casing having a horizontal slot through which a spacing lever of the typewriter is adapted to project and move during operation of the typewriter, a rear member on said casing for enclosing a rear portion of the typewriter, a top portion for the casing, said top portion havinga transparent portion and control means for shifting the rear portion relatively to the base and front portion, and for shifting the top portion relatively to the base and rear portion.

'7. A sound-deadening enclosure for typewriters 1 comprising a base portion and a front portion, said front portion having a horizontal slot through which a typewriter spacing lever is adapted to project and move, a rear member for said casing enclosing a rear portion of the typewriter, a top portion for the casing, said top portion having a transparent portion and control means for shifting the rear portion relatively to the base and front portion, and for shifting the top portion relatively to the base and rear portion, and means for shifting the top portion bodily with the rear portion.

8. A sound-deadening enclosure for typewriters comprising a base and a front portion having a slot through which a line-spacing lever of a typewriter is adapted to project and move, a rear portion pivotally mounted at the rear of said base and extending upwardly to enclose the rear and a portion of the top of said casing, and a top portion adapted to enclose the space between the front edge of the rear portion and the top edge of the front portion, and means for shifting the top portion to give access to the platen of the typewriter.

9. A sound-deadening enclosure for typewriters comprising a base and a front portion having a slot through which a line-spacing lever of a typewriter is adapted to project and move, a rear portion pivotally mounted at the rear of said base and extending upwardly to enclose the rear and a portion of the top of said typewriter, and a top portion adapted to enclose the space between the front edge of the rear portion and the top edge of the front portion, means for shifting the top portion to give access to the platen of the typewriter, and means for shifting the rear portion to give access to the rear of the typewriter.

10. A sound-deadening enclosure for typewriters comprising a base and a front portion having a slot throughwhich a line-spacing lever of a typewriter is adapted to project and move, a rear portion pivotally mounted at the rear of said base and extending upwardly to enclose the rear and a portion of the top of said typewriter, and a top portion adapted to enclose the space between the front edge of the rear portion and the top edge of the front portion, means for shifting the top portion to give access to the platen of the typewriter, and means for shifting the rear portion to give access to the rear of the typewriter, said top portion being also shiftable bodily with the rear portion.

11. A sound-deadening enclosure for typewriters comprising a base portion having an upstanding stationary front casing provided with a slot through which the line-spacing lever of a typewriter is adapted to project and move, a rear portion pivotally mounted at the rear of the base and enclosing the rear of said typewriter, a top portion having a transparent panel for viewing the platen and Work, said top portion having a rotatable bearing about which said top portion may be pivotally turned for telescoping said top portion within the rear portion, and means providing a rolling support for said bearing to permit the latter to be shifted about the pivotal axis of the rear portion, whereby to permit said top portion to be shifted bodily with said rear portion to give access to the rear of the typewriter.

12. An enclosing casing for typewriters comprising a base, an upstanding stationary front portion having a horizontal slot through which the spacing lever of a typewriter is adapted to project and to move, a rear portion having a pivotal axis at its base and at the rear of the base, a lever pivotally mounted to turn about said axis, and terminating in a segmental gear, a second segmental gear meshing with the first mentioned gear, a top portion having a transverse portion, said top portion being connected to said second segmental gear for turning movement therewith, and said top portion being arranged to telescope within the rearportion, means controlled from the outside of said casing for shifting said last named lever to shift the transparent portion, and for also shifting the rear portion,

13. A sound deadening enclosure for typewriters comprising a stationary portion and a portion movable relatively thereto to give access to at least a part of a typewriter, a shiftable enclosing portion,a turnable disk, a crank connecting said disk and said first shiftable member, a turnable shaft having one end projecting outside of the enclosing membena turning lever thereon, a ratchet sleeve rigidly mounted on said turnable shaft, a member turnable with said ratchet sleeve and having spaced-apart'outstanding arms, stop members, a cooperative stop member disposed between said arms and mounted on a stationary part of the enclosing member, a gear mounted to rotate loose on said turnable shaft, a pawlmounted on the faceof said gearadapted to co-act with the ratchet sleeve on said shaft whereby to turn said gear a limited amount determined by the stop arms, a member mounted to rotate with said shaft and having one end of a coiled spring connected thereto, said spring being'coiled about said shaft and having the other end anchored to the stationary part of the casing, means associated with said shaft for holding the same in predetermined angular position, and a driving connection between said gear and said disk whereby to rotate the disk a predetermined amount on the turning of the gear.

14. An enclosing casing for typewriters comprising a stationary portion having a slot through which a shift lever of a typewriter projects and having a movable portion a lever adapted to move said movable portion, a link connected to said second lever, a shaft turnably mounted on said base, a drum rotatable with said shifting link pivotally connected to said drum and pivotally connected to said second lever to shift the latter, a coiled spring having one end fastened to the interior of said drum and having the other end of said spring connected to a ratchet wheel rotatably mounted on said shaft, spaced-apart lugs mounted on the periphery of said drum, said lugs lying in spaced-apart peripheral planes, and located diametrically opposite with respect to said drum, a rod extending parallel to the rotatable shaft, a stopfastened on the end of said rod and overlying'the path of movement of said lugs, means controlled on the exterior of said casing for shifting said rod endwise, whereby selectively to position said stop in the path of either of said lugs, means for holding said rod in such selectively shifted position, a pawl carried by the stationary base for engaging the teeth of the first mentioned ratchet, a second ratchet loosely mounted upon the rotating shaft, a pawl adapted to engage said second mentioned ratchet to con-. meet the same with the rotating shaft, and a control member connected to said second pawl and adapted to engageopposite sides of the coiled spring whereby when the spring is tensioned, it will be drawn inwardly toward the center of the drum to shift the end of the control member to release said second mentioned pawl.

15. A casing for typewriters comprising a rigidly supported portion and a second portion pivotally mounted relative to the first named portion, and a slidable portion movable within said second portion.

16. A casing for typewriters comprising a base, a rigid portion extending upwardly from said base, a second portion pivoted to said base and swingable toward and away from said first portion, and a panel slidably mounted within the second named portion.

17.'A casing for typewriters comprising a base,

a rigidportion extending upwardly from saidbase, a second portion pivoted to said base and swingable toward and away from said first portion, a panel slidably mounted within the second named portion, and means for sliding said panel relative to the first named portion.

18. A casing for typewriterscomprising a base, a rigid portion extending upwardly from said base, a second portion pivoted to said base and swingable toward and away from said first portion, a panel slidably mounted within the second named portion, means for slidingsaid panel relative to the first named portion, and means for swingingly moving said second named portion.

GEORGE J. RUNDBLAD.

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