US1603781A

US1603781A - Typewriting machine

Info

Publication number: US1603781A
Application number: US726424A
Authority: US
Inventors: Lindburg Joseph
Original assignee: Underwood Typewriter Co
Current assignee: Underwood Typewriter Co
Priority date: 1924-07-17
Filing date: 1924-07-17
Publication date: 1926-10-19
Anticipated expiration: 1943-10-19

Description

J. LINDBURG TYPEWRITING MACHINE Filed July 17 Oct. 19 1926.

Memisa oet. 1e, 1926.

Perser orties..

mener-i immense, or BeooirLYiv, New venir, nssenor To Uivnnnwoon TYPE- vferrna coi/Prima on new Yoeri, N. Y., .e oonr'onnrron or DELAWARE.

Application filed July 17, 1924. Serial No. 726,424.

This invention relates generallyto sounddeadening casings for typewriting ma-` chinese, and more lparticularly to an adjustable spring device cio-operating `with` the cover thereof to automatically open the saine when access is desired to thetypewritler. A

' Unefeature of the invention is ithe provision ofmeans for'iobtainin'g a minute'adjustment ofthe spring tension of the device, so as to regulate the' action thereof to obtain the necessary ferce'forprperly opening the cover, while at the sainev tinie'providing a ycompactstructure of sufficient mechanical strength to transmit the action of a heavy spring through the adjusting means and tothe eover'withoutdanger of breaking or injuring the adjusting means. i'

` Another ffeat'ure'is the provision of means for gradually arresting the movement of the coverwhen' it is' approaching the open position, thus eliminating anypossibility of jar or vibration to the veasing'onthe machine contained therein. i i

" Other vfeatures and advantages will hereinafter appear.

In the accompanying drawings,

Figureiis a 'cross-section "through the sound-deadening casingshowing the cover in closed position.- 'v

Figure 2 is a somewhat reduced viev7 similar to Figure 1, but showing the cover opened.

Figure 3 is a plan view of one end of the casing, the cover being broken away to showl the cover-opening deviee. i

Figure'e'is an enlarged vertical section on the line 4 e of Figure 2.

The sound-deadening' casing comprises two main parts, namely, a housing 10 and a rover 11, the cover being hinged at 12 to swing between the positions indicated by Figures 1 and 2. Both the housing- 10 and the rover 1 1 may beformed from sheet material and lined on their inner walls with suitable sound-deadening material, such as that indicated at`13v. The front wall 1-1 ofA the housing- 10` is cut awayv at 15 tor allow 'the keybea'rd eitension of a A typewriting machine `(not shown) to" protrude there-v through" the upper portion of the machine extending under'the cover 11, asshown in dotanddash lines, at 16', window 17' the `cover 11 permits the work being typed in the in achinr-i to be observed. Carriage-operating levers 18y extend through a slot 18 formed between the upper edge of the front wall 141 of the housing l0 and the forward edge 119 of the cover 11, theslot being practically closed by two resilient flexible cushions V2O andV 2'1`carried respectively by the cover and housing. l i

.For lockingthe cover in closed position7 there is pivoted at 22 to one vof the side walls of the cover a latch 23, vwhich extends" into the body of the housing 10 and .is provided with a hooked end 211 which is spring pressed into engagement under a. lip or de-4 tent 25 fastened to the-interior of the housiing. The latch may be disengaged from the detent 25 by pressure upon" a fingerpieee 26, The* cover l11 is caused to automatically openl when the finger-piece 26 has releasedithe'latch, and for this purpose there is provided a spring device consisting of an arni-27 pivoted on'a` shaft 28', one end of the shaft being supported in a bracket 29 carried by the housing'i@ the other end of the lshaft? fitting within an aperture 30 in the end wall ofthe housing. i

The sound-deadening material 13 is cut out or slottedadjacent'the bracket 29 so as to permit the bracket to project therethrough. The arm'27 has an elongated slot 31 therein, which provides side members and an end member 33. A roller 311 projects through the slot 31 and is carried on a shouldered 'screw 35 threadedV into a boss 36 formed in the end Wall of the cover 11. A flat-headed screw 37 retains the roller 34 in position upon the shouldered screw 35 and suihcient clearance is allowed to permit free rotation ef the roller; A pair of springs 3S and 38 are oppositely disposed within the slot 31 of the arm 27', one end ofeach spring;- being curved inwardly toward the opposite spring`r and the other end of each 'spi-ine fastened within the side members 32 of the slot by meansof suitable bolts 39. The free ends of thesprings 38 and' 33 are bent pas allelf with the main body portionA of' the springs, and forked as indicated' at 4:0. The forked ends of the

springs

38 and 33 tend from the slot on both sides thereofY and partiallyy around the end member Q ef the arm 27 to provide guide means for the 'free ends oit the springs.

A worm-wheel 4l is mounted upon the shaft 28, and includes a hub portion 42 projt g through a perforation 42 in the pivoted end et the arm 27, and provides a bearing upon which the arm may be moved anguiarly. In bracket 29 is threaded a setscrew 44, the end of the screw tightening against a fiat place 44 on the shaft 2S to secure the sameagainst rotation. A worm 45 meshing with the worm-wheel 4l is mounted in trunnions, which may be formed on the arm 27, as shown at 47. It will be noted that the worm is retained within the trunnions b y the worm-wheel 4l, and is provined with a slot 48, so as to enable the worm to be turned by means ot a screwdniver in adjusting the device.

A heavy coil spring 49 encirclesthe shaft 2S, one end 50 of the spring fitting into a perforation in the worm-wheel 4'1, the other end 5l of the spring engaging under the bracket 29, the action of the spring being to raise the'cover when the cover is released by the latch 23. A washer 52 may be provided between the arm 27 and the end wall of the housing 10. It will be readily understood that when the worin is turned, the worm-wheel 41 winds up the spring 49 and by this means a very fine adjustment may be made to position the spring to the exact y' ing casing for a typewriting machine includamount necessary to prevent opening the cover too violently. During the time that the cover is being opened by the tension of the spring 49, the roller 34 bears directly against the spring 38 causing the roller to revolve, thus providing a smoothjand practically :trietionless connection between the arm 27 and the cover 1l.

It will be noted that the distance between the center of the hinge 12 and the roller 84 is greater than the distance from the pivotal point of the arm 27 and said roller. It will also be noted that the pivotal point of the arm 27 is somewhat below the line drawn through the center of the hinge 12 and the roller 84, so that when the arm 27 is actuated to move the cover, the screw 35 carrying the roller 34 moves in the slot 8l toward the free end of the arm until arrested by the curved port-ions of the springs 38 and 38', which cause the cover to be brought to rest in open position, due to the wedging action of the roller between the springs. During this operation, the cover has been smoothly moved from the position shown in Figure l and gradually brought to rest in the Figure 2 position without shock or vibration.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim: v

l. The combination with a sound-deadening casing for a typewriting machine including a body, a cover hinged thereto, and releasable means for holding the cover closed, of a co'venopening device including an arm pivoted to the body, a connection. from the pivoted to the body, a connection from the cover to the arm and moving with relation thereto when the cover is released to open, means for automatically swinging the arm around its pivot, and a pair of oppositelydisposed spring members secured to the arm and receiving the connection in slidable rclation thereto, said spring members being curved inwardly toward one another to provide a wedging action upon said connection to gradually arrest the movement of the cover when thrown open by the action of the arm.

3. The combination with a sound-deadening a body, a cover hinged thereto, and releasable means for holding the cover closed, of a cover-opening device including an arm pivoted to the body and having a pin-andslot connection with the cover, means for automatically swinging the arm around its pivot to open the cover when released, and means associated with said slot and efective to frictionally engage the pin to limit the throw of the arm when opening the cover.

4. The combination with a sound-deadcn ring casing for a typewriting machine includslot connection with the cover, means tor automatically swinging the arm around. its pivot to open the cover when released, and means associated with said slot and effectingl a wedging action against the pin to gradually arrest the movement of the cover when opening.

5. The combination with a sound-deadening casing for a typewriting machine includv ing a body, a cover hinged thereto, and releasable means tor holding the cover closed. of a cover-opening device including an arm pivoted-to the body and having' a pin-and slot connection with the cover, means for automatically swingingthe arm around its pivot to open the cover when released, and a lll) pair or' spring` members secured within the slot o'n opposite sides oi' the pin, the free ends or' said spring members being curved inwardly toward each other and leffecting a wedging action against the pin to gradually arrest movement oi' the cover when 'approaching open position.

6. The combination with a sound-deadening casing for a typewriting machine including a body, a cover hinged thereto, and releasable means for holding the cover closed, of a cover-opening device including an arm pivoted to the body, said arm having a slot therein, a roller carried by the cover and moving in the slot, means tor automat-ically swinging the arm around its pivot to open said cover when released, and means associated with said slot and ei'lective to itrictionally engage said roller to gradual` ly arrest the movement ot the cover when opening.

7. The combination with a sound-deadening casing tor a typewriting machine including a body, a cover hinged thereto, and releasable means for holding the cover closed, ot a cover-opening device including an arm pivoted to the body, said arm having a slot therein, a roller carried by the cover and moving in the slot, means for automatically swinging the arm around its pivot to open said cover when released, and means associated with said slot to permit Ythe roller to have free rotational movement thereon during a portion of the opening oit the cover and then to frictionally engage said roller to gradually arrest the movement of the cover as the same approaches open po sition.

8. The combination with a sound-deadening casing for a typewriting machine including a body, a cover hinged thereto, and releasable means for holding the cover closed, ot a cover-opening device including an arm pivoted to the body, said arm having a slet therein, a roller carried by the cover and moving in the slot, means for automatically swinging the arm around its pivot to open said cover when released, and a pair ot oppositelydisposed spring members secured within the slot and engaging the roller, the :tree ends of said spring members being curved inwardly toward each other and effecting a wedging action to cause the roller to gradually arrest the movement of the cover as it approaches open posit-ion.

9. The combination with a sound-deadening casing for a typewritino` machine includiug a body, a cover hinged thereto, and releasable means Jfor holding the cover closed, o'l a cover-opening device including an arm pivotedlto the body, a connection :trom the cover to the arm and moving with relation thereto when the cover is released to open, means for automatically swinging the arm around its pivot, and a pair ot oppositely-disposed spring men'ibers secured to the arm and receiving the connection in Aslidable relation therewith, sai-l members being curved9 inwardly toward one vanother so as to cause said connection to torce the members apart to increase the rictional engagement between said connection and mehr bers and thereby gradually arrest Inovement of the cover as the same approaches open posit-ion.

l0. rlhe combination with a sound-dead ening casing for a typewriting machine having a body, a cover hinged thereto, and releasable means for holding the cover closed, of a cover-opening device including an arm pivoted to the body and having a connection to the cover` resilient means :tor turning said arm around its pivot to open the cover when released, and a worm-andwheel connection between the arm and the resilient means :tor varying the tension oi said resilient means to regulate the throw of the arm.

11. The combination with a sound-deadening casino' for a typewriting machine having a body, a cover hinged thereto, and releasable means for holding the cover closed, of a cover-opening device including a shaft mounted in the body, an arm swingable around said shaft, a connection between the arm and the cover, a worm-wheel se" cured to the shaft and movable angularly with relation to the arm, a worm carried by the arm and meshing with said wormwheel, and a coiled spring disposed around the shaft for opening the cover when released, one end of the spring engaging the body and the other end carried in the wormwheel, so that, upon turning the worm, the

tension of said spring may be varied and the cover-opening effort oi the arm regulated.

l2. The combination with a sound-deadening casing Jfor a typewritinv' machine ini cluding a body, a cover hinged thereto, and releasable means for holding the cover closed, of a cover-opening device including an arm pivoted to the body, a connection from the cover to the arm and moving with relation thereto when the cover is released to open, resilient means for automatically swinging said arm around its pivot to impart motion to the cover, means associated with said arm and connection for gradually arresting and then stopping the movement ot the cover as the same nears its open position, and a worm-and-wheel connection between the arm and the resilient means for varying the tension ot said resilient means to regulate the throw ot the armg 13. The combination with a sound-death ening casing for a typewriting machine having a body, a cover hinged thereto, and releasable means for holding the cover closed, of a cover-opening device including tension of said resilient means7 and means an arm pivoied to the body and having a associated With the slot and effective to pin-andslot connection With the cover, i'e- Cause an increasing frctional action against l0 silient means for causing a tlnoW of the the pin to gradually rrest and then stop arm so as to impart movement to the cover, the movement of said cover as it approaches a Worm-and-Wheel connection between the open position.

v arm and the resilient means for varying the JOSEPH LINDBU; l.