US1929991A - Sound deadening housing for typewriters - Google Patents

Description

Oct. 10 1933. DBLAD 1,929,991

S OUND DEADENI NG HOUS ING FOR TYPEWRI TER S Filed March 11, 1929 5 Sheets-Sheet 1 o 10 1933- a. J. RUNDBLAD 1,929,991

SOUND DEADENING HOUSING FOR TYPEWRITERS \Filed latch 11, 1929 5 Sheets-Sheet 2 Oct.'10 1933. a. J. RUNDBLAD SOUND DEADENING HOUSING FOR TYPEWRITERS Filed March 11, 1929 s Sheets-She et s Oct. 10 1933. .1. RUNDBLAD SOUND DBADENING HOUSING FOR TYPEWRI TERS Filed March 11, 1929 Oct. 10 1933.- a. J. RUNDBL'AD 1,929,991

somm nmsuma nousmer roa nrswmmas Filed Maren 1929 5 -Sheets-Sheet 5 Patented Get. 10, 1933 UNITED STATES PATENT OFFICE,

soUNn DEADENING, HOUSING FOR 'rvrsvvnrrsns George J. itundblad, Woodstock, lili., assignor to Woodstock Typewriter Company, Woodstock, 111., a corporation of Illinois Application March 11, 1929. No. 345,934.-

g 39 Claims. (Cl. 2117-60) This invention relates to mechanism for enthereto at 2 which forms a lid to completely enclosing a typewriter and has for one of its objects close the typewriter except for the keyboard the provision of means to deaden the sound inciwhich projects through and snugly fits in an dent to the operation thereof. opening in the front of the lower half of the 1 Another object is to make the mechanism of housing so as to be readily accessible to the opco the typewriter readily accessible for certain purerator. The material of which the housing is poses, such as when it is desired to remove the constructed is immaterial as far as the present 1 paper from the plate-nor adjust the tabular invention is concerned, but it is understood that StODS. any well-known sound deadening materials may Another object of the invention is to prevent be used or any construction of the walls or the 65 g the accumulation of dust and dirt on the type like that will aid in keeping the sound therein. writer. The I typewriter is a power driven typewriter Other objects of the invention will appear hereand from one side thereof projects a shaft which inafter, the novel features and combinations beis continuously rotating. This shaft is driven by ing set forth in the appended claims. an electric motor or from any other source of 70 In the accompanying drawingspower which may be desired. This shaft 4 in Fig. l is. a sectional elevation of a housing emturn drives a shaft 5 through a coupling member bodying my invention, showing the position the 6 of any well-known construction, but preferably 7 typewriter would occupy in dotted lines; comprising a pair of flanges attached respectivea 2 is a verticalsectional View thereof; 1y to theshafts 4 and 5, which in turn carry pins 75 Fig. 3 is a front elevation of the housing with (shown in dotted lines) projecting into an intera section thereof broken away to show certain posed flexible member to provide a silent and flexof the operating levers; ible drive for the shaft 5.

Fig. 4 is a fragmentary view showing mech- The shaft 5 is used to operate the mechanism anism for raising and lowering the cover; for raising and lowering the cover 3 when it is Fig. 5 is a view looking from the right of Fig. desired toinspect or remove the work or adjust 1 -p thereof ection; the tabular keys on the typewriter, or for any 6 is a view looking from the right of Fig. 5; similar purpose. This mechanism more fully to 7 is a section on the line 7-7 of Fig. 5; be described ,hereinaft r constitutes the main 30 Fig.8 is a section on the line 8-8 of Fig. 5; feature of novelty in the present device and its Figs. 9 and 10 are cross-sections of the mechasimplicity and usefulness will be more apparent nism for cushioning the opening movement of as the description thereof proceeds.

the cover, taken on the lines 99 and 10-10 112- In general the raising of the cover 3 is accom- Spectively of ig. 4; plished by rocking the lever in a vertical direc- Fig. 11 is a detail view of the arm connected tion about the shaft 8 from the full to dotted with the cushioning member in Fig. 4; and 7 line positions shown in Fig. i. This in turn rocks Figs. 12 to 18, inclusive, are detailed views of the arm 9 about the pivot 10 to the dotted line various parts used in the mechanism for raising position shown in said figure. Levers 7 and 9 and lowering the coverofthecasing. are connected by a lost motion connection com- 40 In the use of typewriting machines, and espeprising a pin 11 on arms which slides in a slot cialiy those operated by electric; motors, there is 12 in arm 7. considerable noise produced and the present in- Movement of arm 9 upwardforces the arm 13 in vention aims to reduce this noise so that the opthe same general direction and lifts the cover by oration oi the typewriter will be less bothersome the action of the end of slot 14 therein against the 45 to thetypist and others in the vicinity of the pin 15 which is rigidly fastened to the cover 3;as

typewriter. This is accomplished by enclosing shown in Fig. 9, and has a circumferential groove the typewriter in a sound deadening housing gentherein which permits it to guide the side memerally denoted A in the drawings. The typebers of the slotted member 13. Some means must wtcr B is shown in dotted lines and is entirely be used to cushion the opening movement of the so within the housing except for the keyboard 0 cover so that there will be no jar, and for this thereof which projects outside of the housing as purpose a spring-pressed slidingblock l6 operatshown in Fig. l. I ing in slot- 14 abuts against the upper side of pin The housing A comprises two parts, the lower 15. It is provided with a steml'l screw-threaded part 1 which supports and encloses most of the or otherwise fastened therein and surrounded by to. typewriter, and the upper part or cover 3 pivoted a spring 18 which abuts againstthe block 16 and 11 0 a rigid abutment 19 fastened by screws across the slot 14 at the end of the member 13, which abutment also serves as a bearing, see Fig. 9, for slidably receiving the stem 17. The rather sudden opening of the cover has the tendency to carry the cover upward after the lever 9 has reached the extent of its upward movement and this added movement is gradually checked by the spring 18 which is compressed and the cover is finally returned to a position of rest with the pin at the lower end of slot 14 when the spring again has expanded. Thus it will be seen that a very efiloient and simple means has been provided for effectively raising the cover and while all this may be accomplished by manually raising the lever 7, it is preferred to use a power means set in motion by a simple key mechanism mounted on the front or" the housing, and which means will now be more fully described.

Mounted in the lower part of the housing are brackets 20 and 21 having upstanding ears forming bearings for the shafts 22, 5 and 8 and which are driven through any suitable gearing, such as shown in Fig. 2, from the driven shaft 5. Thus shaft 8 is always rotating.

Rigidly mounted on this shaft is a ratchet wheel 23 and loosely mounted thereon are the member 24, spring drum 25, ratchet wheels 26 and 27 and arm 7. Arm 7 is rigidly connected to ratchets 26 and 27 by pins 28,.see Figs. 4, 7 and 15, so that they all turn in unison about shaft 8.

Drum carries a spring interiorly thereof and the spring is fastened at its outer end by a struckout portion 30 on drum 25 engaging a hole formed in the end of the spring, while the inner end thereof is similarly fastened at 31 to an annular portion 24 on member 24 which encircles hub 25 of drum 25. This spring is wound up by rotation of member 24 while the housing 25 is held relatively stationary. This is accomplished in the following manner: A pawl 32 is adapted to engagethe ratchet 23 when the spring has unwound because of the fact that the outer end 33 of the spring 29 will at that time be near the inner side of the casing 25 and will rock the lever 34 clockwise about pivot 35 as seen in Fig. 6. The lever 34 has the end which engages the spring notched as at 36 so as to straddle the spring and move therewith, see Fig. 12. When pawl 32 engages ratchet 23, part 24 is rotated and winds the spring 29 until the proper tension has been given thereto, whereupon the outer end of the spring is caused to move away from the inner wall of the casing 25 and rock the lever counterclockwise, as seen in Fig. 6, and thus withdraw the pawl 32 from engagement with the driven ratchet 23. The member 24 is kept from reverse rotation by means of pawl 37 mounted on pivot 38 and spring-pressed by means of spring 39 into engagement with. ratchet 40 integral with member 24. A cover plate 67 mounted integral with member 24 protects the spring 29 from dust and dirt.

The energy thus stored in spring 29 is used to raise the cover 3 when the drum 25 is released.

'The drum is normally held stationary by a projection 41 on lever 42 engaging one of four struckup lugs 43 spaced 90 apart on the outer face of drum 25, but when the lever 7 is in its lowermost position it is released as shown in Fig. 7. This allows the drum to rotate just slightly past the projection 41, but it is kept from rotating farther by pin 44 engaging one of the lugs 43 spaced oppositely in respect thereto. This pin 44 is spring-pressed to the left as shown in Fig. 5 and moved by cam 45 to the right into the path of lugs 43. The pin 44 has one fiat face 46, best seen in Fig. 14, and projects through ratchet wheels 26 and 27 and through a hole 47 in arm 7 having a complementary shape to the end of the pin 44, see Fig. 15. The fiat face of the pin 44 engages lugs 43.

The tendency of the spring 29 is to rotate the arm 7 and ratchet members 26 and 27 in a clockwise direction, as seen in Fig. 4, through the intermediate members 25, 43 and 44, but is unable to do so as long as the pawl 47 is in engagement with ratchet 27 mounted on a pivot 43 fastened to the framework 21. To release this pawl a lever 49 mounted on pivot 48 is provided with a pin 50 which when rocked to the right in Fig. 4 will release the pawl from engagement with ratchet 27. This allows the energy stored in the spring to raise the arm through connections 25, 43 and 44 until the arm 7 is in its extreme upward position, at which time the left end of the pin 44, in Fig. 5, has come down off the cam sur face 45 and is retracted by action of the spring 68.

The drum then is free to rotate until one of the projections 43 engages the lug 41 on lever 42 which is carried to its uppermost position by spring 53 when the lever 7 is raised.

The lever 7 is kept in raised position by pawl 54 engaging the ratchet 26 and when it is desired to lower the cover, lever 49 is rocked to the left to release this pawl and allow the lever 7 to descend clue to the weight of cover 3. When the lever has almost reached the limit of its downward movement it strikes projection 55 on lever 42 and the final closing movement of the cover cushioned because of spring 53 acting through lever 42 against downward movement of lever 7. At the same time the lowermost lug 43 is released from lever 42 and the pin 44 which has been moved to the right by cam 45 again engages the uppermost lug 43 and the device is ready to be operated again. Spring 56 yieldingly holds the desired pawl in engagement with its respective ratchet and against pin 50. To rock the lever 49 a simple toggle mechanism is provided comprising lever 51 which is moved back and forth by bell crank 52 pivoted at 57. This bell crank is in turn rocked by a pivoted bell crank 58 having a notched end 59 engaging a projection 60 on lever 52. This bell crank is in turn rocked by levers 61 and 62, the latter being pivoted at 63 and having two projecting arms 64 and 65 which when pressed, alternately rock lever 49 through the connecting levers 61, 58, 52 and 51 to either raise or lower the cover 3. Depressing the member 65 opens the cover and depressing lever 64 closes it. Obviously other arrangements may be used to rock lever 49, but the present means places the operating key near the operators hands and therefore is preferred.

The keys may be suitably marked with an O for open and a C for close as shown in Fig. 1, but other designations may be used and obviously it is not necessary that they be marked at all, if desired. Lever 58, Fig. 3, is held to the right or to the left by means of spring 63 which is always on the corresponding side of pivot 69 as is the lever 58.

The cover 3 is preferably provided with a glass panel 66 so that the operator may view the work as the typing progresses, but this is not essential to the operation of the machine.

The operation of the device is as follows: With the; cover in closed position as shown in Figs. 4

(iii

to 7, inclusive, it is now desired to raise thecover for whatever purpose desired. The key member 65 is depressed, thus rcckinglever 49 to the right to releasepawl 47, as seen in Fig. 4, through intermediate levers 62, '61, 58, 52 and 51-. This permits the spring 29 to rotate the drum and consequently move the lever 7 upward. This in turnrocks lever 9 which forces thecover open, the opening movement of the cover being cushioned by pin 15 acting against spring 18. 'At approximately the time the cover reaches its full open position, the pin ie is retracted by spring The cover is held open at this time by engagement of pawl 54 with ratchet 26. The drum 25 now being free to rotate, rotates until one of the lugs 43 comes into contact with the projection 41 on lever 42 which at this time is in a raised position, thus stopping rotation thereof.

When it is desired to close the cover, member 64 is depressed rocking lever 49 so as to release pawl 54 and permit the cover to descend of its own weight. As it approaches the downward extent'of its travel, pin 44 is forced into the path of member .43 by cam 45 and lever 7 moves lever 42 downwardly releasing the drum 25 which can .now rotate until the stop adjacent the pin 44 comes into engagement therewith and the mechanism is again in a position to raise the cover by depression ofthemember 65. It will be noted that after the lever 42 is depressed the lug 43 which was in engagement with the stop 41 will now be moved just slightly past the stop 41, see Fig. '7, and consequently the stop cannot again move into engagement with the same lug 43 to prevent the spring from raising lever '7 when the pawl 47 is released.

its further usefulness to'raise the cover is very limited, the lever 34 is rocked as previously explained and the ratchet 23is engaged by pawl 82, thus causing the members 24 and 23to be temporarily connected and cause the former to wind the inner end or" the spring until sufiioient tension is produced and the pawl 32 is caused to r be disengaged from the'ratchet 23, spring 39 restricted to the precise construction herein disclosed.

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

1. In a sound-deadening housing for typewriters,-the combination with a cover for a typewriter of self-contained power-operated mechanism for opening said cover, means operatively associated with the cover for effecting the closure of said cover by gravity independently of said power-operated mechanism, and manually actuated mechanism operatively associated with the cover and the power operated mechanism for controlling the opening and closing of said cover.

2. In a sound-deadening housing for typewriters, the combination with a cover for a typewriter, of a motor, connections between said motor and said cover for opening said cover by power from said motor, means operatively associated with the cover for effecting the closure of said cover by gravity, and means operatively'associated with the motor and the cover for holding the motor inoperative during the closure of said cover; i

3. In mechanism for operating a cover, the

combination with a cover, of a motor, means connecting said motor to said cover to open the latter by the power of said motor, means operatively associated with the cover for effecting the closure of said cover by gravity, and means operatively associated with the cover for storing power in said motor independently of the closing of said cover.

'4. In mechanism for operating a typewriter cover, the combination with a motor, of power transmission mechanism operatively associated with the motor and the cover of a typewriter to open such cover by power from said motor, means operatively associated with the motor and cover for controlling said power transmission mechanism to effect the opening of said cover by power from said motor and the closure of said cover by gravity independently of said motor, and a source of power operatively connected with the motor separate and independent of the closing operation of said cover.

5. In I apparatus for operating a cover for a typewriter thecombination with a motor, of power transmission mechanism operatively' con- .nected to said motor and associated with the cover of a typewriter, and means for releasing said power transmission mechanism to permit the cover to close by gravity independently of with and connected to a cover for a typewriter, Whenever the spring becomes unwound so that.

and controlling means operatively associated with the transmission mechanism for effecting motor and closure of said cover by gravity indeendently of said motor while said motor is held against operation.

7. In apparatus for operating the covers of typewriters, the combination with a spring motor comprising a rotatable element, of a plural-- ity of circumferentially spaced lugs projecting from "said rotatable element, power transmission mechanism comprising spaced-apart ratchets reversely arranged and mounted to rotate on the axis of said rotatable element, and means associated with said lugs and said ratchets to control the transmissionof power to the cover to open the same and the release of the cover to eifect the closure thereof by gravity independently of said motor.

8. In apparatus for operating a cover, the combination with a motor, of power transmission mechanism connected between said motor and the cover to be operated and comprising an actuating arm, reversely arranged ratchet wheels connected to said arm, pawls associated with said ratchet wheels, means for driving the wheels through said pawls, and means for releasing one of said pawls to effect the opening of said cover and the other pawl for effecting the closing of said cover.

I 9. In apparatus for operating a cover, the combination with a motor comprising a rotatable element of a plurality of cireumierentially spaced lugs on said rotatabie element, power transmission mechanism adapted to be connected to the pressed pin, a cam in position to move said springpressed pin for engagement by one of said lugs when the cover'is closed, and means for restrainthe opening of said cover bypower from. said i I no 1. and

cover to be operated and comprising a springing operation of said motor when the cover is open and said pin is out of engagement with all of said lugs.

10. In apparatus for operating a cover, the combination with a motor comprising a rotatable element, of a plurality of circumferentially spaced lugs on said rotatable element, power transmission mechanism comprising a pivoted arm, a spring-pressed detent carried by said arm, a stationary cam for moving said detent into the path of said lugs for engagement by one of them when the cover is closed, pawl and ratchet mechanism for preventing said motor from opening said cover, means for releasing said pawl and ratchet mechanism to cause said motor through one of said lugs and said cletent to operate said power transmission mechanism to open said cover, and latch mechanism in position to engage one of said lugs to prevent rotation of said rotatable element after said power transmission mechanism has been operated to open said cover.

11. In apparatus for operating a cover, the combination with a motor having a rotatable element, of a plurality of lugs circumferentially spaced on said rotatable element, power transmission mechanism comprising a pivoted arm, a spring-pressed detent secured to said arm for bodily movement therewith in position to be moved into the path of said lugs, a stationary cam for moving said detent into such path when said arm is in cover-closing position, pawl and ratchet mechanism for preventing said motor from moving said arm to ceveropening position, means for releasing said pawl and ratchet mechanism to cause saidmotor through one of said lugs and said detent to move said arm to cover-opening position, pawl and ratchet mechanism for preventing rotation of said rotatable element after said arm has been moved to cover-opening position, additional pawl and ratchet mechanism for holding the cover in open position against closure by gravity, and m ans for releasing said additional pawl and ratchet mechanism to permit said cover to close by gravity independently of said motor,

12. In apparatus for operating a cover, the combination with a motor, of power transmission mechanism comprising an arm operated by said motor to move said cover, a pawl and ratchet device associated with said arm to hold the cover open, and another pawl and ratchet device associated with said arm for holding the cover closed.

13. In apparatus for operating a cover, the combination with motor comprising a rotatable element, of power transmission mechanism comprising an arm adapted to be connected to the cover to be opened and closed, pawl and ratchet mechanism for holding the cover closed, additional pawl and ratchet mechanism for holding the cover open, and latch mechanism for preventing rotation of said rotatable element after said cover has been moved to open position and until said cover has again been closed.

14. In apparatus for operating a cover, the combination with a motor, of power transmission mechanism operatively connected to a cover to be operated, operative connections between said motor and said power transmission mechanism for normally urging the latter to open the cover, mechanism for releasably restraining said power transmission mechanism against opening of said cover, means for releasing said restraining mechanism without moving said motor to thereby cause said motor through said connections and said power transmission mechanism to open said cover, means associated with the cover and normally biasing the cover toward closed position, mechanism associated with the cover for holding the cover in open position, and means for releasing said last-named holding mechanism to effect the closure of said cover.

15. In apparatus for operating a cover, the combination with a spring motor comprising a spring connected between a normally stationary element and a rotatable element, of power transmission mechanism adapted tobe connected to the cover to be operated, connections between said rotatable element and said power transmission mechanism to cause said spring to normally urge said. power transmission mechanism acting on said rotatable element to open said cover, pawl and ratchet mechanism for restraining said power transmission mechanism against movement to open said cover, and means for releasing said pawl and ratchet mechanism to permit said spring to exert its power to open said cover.

16. In a sound-deadening chamber for typewriters, the combination with a covering means for typewriters, of mechanism for raising said covering means, rotatable power actuated member detachably connected to the mechanism for raising the covering means, power means for said member, means for temporarily restraining the power means from actuating the rotatable means for releasing said restraining means, means for detaching the power means from the mechanism for raising the covering means, means for closing the covering means, and means for re-establishing connection between 1.18 rotatable member and the mechanism for raising the covering means.

1'7. In mechanism for operating a closure, the combination with a motor, of power transmission mechanism operatively connected to said motor and to the closure to be operated, means associated with the transmission mechanism for temporarily restraining said motor from operating said power transmission mechanism, and means associated with and operable on the closing of said closure to release said restraining means.

18. In a mechanism for operating a closure, the combination with a closure, of a power means for operating said closure, means detach ily connecting the closure and power means, means for holding the power means in inoperative position, means for releasing the power means for disconnecting the power means from the closure, means for i e-establishing connection therebetween when the closure is closed, and means for automatically storing power in the power means when the power thereof has become lessened.

19. In a sound-deadening housing for typewriters, the combination with a two-part covering for a typewriter, of a means for opening one part of said covering comprising a rotatable drum, a spring for rotating said drum, a lever adapted to open said one-part detachably connected to said drum, means for holding the l ver in inop ative position, means for releasing said hold 1g means, means for holding the open part of the covering in open position, and be for auto matically storing up energy in the ring adapted to be operatively connected to a power actuate-d part of a typewriter associated with the housing.

20. In mechanism for operating a closure, the combination with a motor, oi power tran ,ission mechanism connected to said motor, a ccntantly driven shaft, and means for automatically storing power in said motor intermittently from said constantlydriven shaft.

.21. In mechanism for operating a closure,"the

combination with a spring motor having anactu- C ating spring, of power transmission mechanism-- operable by said motor and adapted to beconnected to the closure to be operated, a driven shaft, and means for automatically connecting.

said shaft to the spring of said motor to wind up the same when the spring becomes unwound.

22. In a closure operating means for type writers, the combination with a closure normally biased toward closed position, of power means 0p eratively associated with the closure for oper' to closed position, and, means operatively associated with the closure for positively holding said closure in closed position. 1 i

23. In a sound deadening housing for typewriters, thecombination with covering means for a typewriter normally biased toward closed position, of self-contained power m chanism oper-- atively associated with the covering means for opening said covering means, said power means being detachable from said 'covering means when said covering means is open, and means associated with the covering means for holding the covering means in open position after the power means is detached.

24. In a sound deadening housing for typewriters, the combination with covering means for a typewriter normally biased toward closed position, of a selfcontained power mechanism operatively associated with, the covering means .ior opening said covering means, said power means being detachable from said covering means when said covering means is open, means associated with the covering means for holding the covering means in open position after the power means is detached, and means operatively associated with the holding means for releasing said holding mean to permit said covering means to close.

in a sound deadening housing for typewriters the combination with covering means for a typewriter normally biased toward closed position, of a self-contained power operated mechaoperatively associated with the covering means for opening said covering means, said power means being detachable from said covering means when said covering means is open, releasable means associated with the covering means for holding the covering means in open position after the power means is detached, means operatively associated with the holding means for releasing said releasable means to permit said covering means to close, and operatively associated with the covering, means for cushioningthe closing movement of said covering means.

26.- In a sound deadening housing for 'typewriters, the combination with covering means for a typewriter normally biased toward closed position, ofa power operated mechanism operatively associated with the covering means for opening said covering means, said power means being detachable from said covering means zwhensaid covering means is open, means associated the covering means for releasably holding said cove ing means positively in its open position, means operatively associated with the holding means for releasing said releasable means to permit said covering means to close, means operable "'on closing of said covering means toautomatithe covering means and normally :igsaid power: means outof operative con-, n ion with said covering means, said resiliently hold member being operable by said covering means as the same moves to closed position to to said coveringmeans, said resiliently held abcr acting to cushion the closing move-: ment o said covering means.

28. In a mechanism for operating a closure, the combination with a motor adapted to be selectively connected to said closure to open the same, means operable by the closure for disconnecting the motor from said closure after said closure is opened, said means being operable to operatively connect said motor to said closure when closed so that said closure may again be opened by said motor, and additional manually controllable means to prevent operation of said motor when connected to the closure until it is desired to open saidclosure.

29. In an apparatus for operating a cover, the combination with a motor having a rotatable element, of a plurality of lugs circumferentially spaced on said rotatable element, power transmission mechanism comprising a pivoted arm, a spring-pressed detent secured to said arm for esiliently held member operativelyf release said power means and permit its connecbodily movement therewith in position to be moved into the path of said lugs, a stationary cam for moving said detent into such path when? said arm is in cover-closing position, pawl and ratchet mechanism for preventing said mechanism from moving said armto cover-opening po sition, means'for releasing said pawl and ratchet mechanism to cause said motor through one of said lugs and said detent to move said arm to cover-opening position, a second pawl and ratchet mechanism for preventing rotation of said roet mechanism for holding the cover in open position against, closure by gravity, means for releasing said third mentioned pawl and ratchet mechanism to permit said cover to close by gravity independently :of said motor, and means automatically operable upon movement of said arm to cover-closing position for releasing said second mentionedpawl and ratchet mechanism toaestablish connection "between said rotatable element and said arm by means of said detent:

and one ofsaid lugs and for automatically rendering said first mentioned pawl and ratchet mechanism operative to prevent rotation of said cover until said first mentioned pawl and ratchet mechanism is released. H b

30. In a closure for typewriters, the combination with a power means operatively connected to the closure for moving said closure toopen position, of latchmeans operatively associated'with the closure, for holding said closurein'opn position and for releasingsaid closure to permit said closure to move to closed position freely under the force'of gravity through'substantially its entire closing movement, and means associated tatable element after said arm has been moved to cover-opening position, a third pawl and ratch- I with the latch means for cushioning the latter part of the closing movement thereof.

31. In a sound deadening housing for typewriters, the combination with a closure, of spring operating means for opening said closure, means associated with the closure and its operating means for disconnecting said operating means from said closure after said closure has been opened, means for closing said closure while the latter is detached from said spring operating means, and additional means associated with the spring operated means for storing energy in said spring to compensate ior the energy lost during the opening movement of said closure.

32. In a sound deadening housing for typewriters, the combination with a closure, of spring operating means for opening said closure, means associated with the closure and its operating means for disconnecting said operating means from said closure after said closure has been opened, means for closing said closure while the latter is detached from said spring operating means, and additional means associated with the spring operated means for storing energy in said spring to compensate for the ener y lost during the opening movement of said closure comprising a constantly driven member normally disconnected from said spring operating means but selectively connectable to said spring operating means to store ener y in said spring operating means after said spring operating means has lost a predetermined amount of energy.

33. In a sound deadening closure for typewriters, the combination with a closure, of a motor operatively associated with the closure for opening said closure, said motor having a coiled spring adapted to expend its energy in opening said closure, means normally holding said closure and motor disconnected from each other as said closure moves to closed position, a continuously driven shaft operatively associated with the motor, and means operable to connect said continuously driven shaft with said spring to wind said spring to thereby store in said spring energy lost upon successive openings of said closure by said spring motor.

34. In a sound deadening closure for typewriters, the combination with a closure, of a spring motor for opening said closure having a coiled spring therein adapted to expend its energy in opening said closure, means for holding said closure and motor disconnected from each other as said closure moves to inoperative position, a continuously driven shaft, and means automatically operable to connect said continuously driven shaft with said spring to wind said spring to thereby store in said spring energy lost upon successive openings of said closure by said spring motor comprising pawl and ratchet mechanism normally out of engagement with each other to disconnect said continuously rotating shaft from said spring but movable into engagement with each other to connect said continuously rotating shaft with said spring by means controlled by the tension in said spring.

35. The combination with a sound deadening closure or housing for typewriters, of a power winding mechanism for spring motors operatively connected to open the closure, an element connected to said spring for winding the same, a continuously rotating shaft, a ratchet on said continuously rotating shaft, a pawl connected to said element adapted to be moved into engagement with said ratchet to thereby cause said element to rotate with said ratchet, and an operative connection between said pawl and a portion of said spring for moving said pawl into engagement with said ratchet when said spring becomes unwound a predetermined amount.

36. In a sound deadening housing for typewriters, the combination with means for covering a typewriter, of a self-contained power device for raising said covering means, said power means being detachably mounted on said covering means and being removable only when the covering means is in a predetermined open position, and means for holding the covering means in open position after the power means is removed, said power means comprising a spring motor, a winding element connected to the motor for tensioning the spring thereof, a rotating shaft driven by the spring, a ratchet on the shaft, a pawl connected. to the winding element and adapted to be moved into engagement with the ratchet to thereby cause the shaft to rotate with the winding element and an operative connection formed between the spring and the pawl and operative, when the spring is unwound to a pre determined degree, to move said pawl into engagement with the ratchet.

37. In a sound deadening housing for typewriters, having a shiftable cover, the combination with the cover of cover actuating mechanism, and a spring motor for operating said actuating mechanism, said motor comprising a spring connected between a normally stationary elem I and a shiftable element, said shiitable elen t being operatively connected with the cover actuating mechanism whereby the spring normally urges said actuating mechanism to open the cover, latch means operatively associated with the shiftable element for restraining the operation of the cover actuating mechanism and means to release said latch means to permit the spring to exert its influence to open the cover.

38. In a cover raising mechanism, the combination with a cover to be raised, of means operatively associated with the cover for raising same, said means comprising a shiftable member, a spring operatively associated therewith for shifting said member, an operating member detachably connectible to the shiftable member and operatively associated with the cover to actuate the same, means for holding the operating member against cover actuating movement, means for releasing said holding means, means for hold- 1 ing the cover in open position, and means adapted for operative connection with a power actuating part for automatically storing up energy in the spring.

39. In a cover actuating mechanism, the combination with a shiftable cover adapted to move between open and closed position, of forming a motor for actuating said cover, cover actuating mechanism operatively associated with said cover and said motor to transfer the power of the motor and apply it for shifting the cover, and means operatively associated with said cover actuating mechanism to provide a resilient buffer for cushioning the movement of the cover at an extremity of its operative movement.

GEORGE J. RUNDBLAD.

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