US1591920A - Typewriting machine - Google Patents

Description

July 6,1926. 1,591,920

C. B. CORCORAN TYPEWRITING MACHI NE Filed Nov. 23, 1923 Patented July 6, 1 926.-

UNITED STATES 1,591,920 PATENT OFFICE.

CORNELIUS B. CORCORAN, DECEASED, LATE OF NEW YORK, N. Y.; BY MICHAEL J. CORCORAN, ADMINISTRATOR, OF NEW YORK, N. Y., ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

Application filed,November 2B, 1923. Serial No. 676,514.

This invention relates to sound-deadening devices for typewriting machines, and is in the nature of a sound-muflling canopy for a sound-absorbing shell which encloses the typewriting machine while permitting the ordinary typing operations to be carried on.

The invention may preferably be used in combination with a sound-deadening shell or shoe, such as, for example, that shown in the co-pending application, Serial- No. 604,468, filed December 2, 1922 (now patent No. 1,509,828, dated September 30, 1924). The canopy may be swingably mounted upon the rear wall of the box.

In the preferred form, the cover comprises an upstanding flat portion of about the width of the rear wall of the box, normally spaced a sufficient distance from the rear wall to allowa long work-piece zto'be hung therebetween. Integral with the flat portion is an upper curved portion, which extends forwardly over the platen, so as to absorb the sound waves which are produced by the types striking the platen, and those due to the movements of the platen and the platencarriage. The vibrations are absorbed by the dampening material with which the canopy is lined.

The canopy is preferably composed of an outer light, sheet-metal plate and an inner foraminous plate, which exposes a soundabsorbing filler, such as felt, confined between the plates.

The normal effective position of the canopy over the carriage allows typing'to be done without interference; provides an unobstructed view of the work-sheet for a substantial distance above the printing posi-- tion; does not interfere with the making of erasures or corrections at the printing line; provides a smooth metallic surface to deflect the leading edge of the Work-sheet downwardly within the space formed by the rear wall of the box-sectionand the front wall of the canopy; has open ends, so as not to interfere with the to-and-fro movement of the carriage and work-sheet; and is arranged to swing across the top of the ma- I chine to a rear inoperative position through wall of. the shell, so that it may be swung backwardly to give free access to the top of the carriage,

The lower edge of the canopy is preferably hinged near the bottom of the shell, so that long work-sheets inserted around the platen and projecting over the rear wall may be accommodated without interfering with the carriage movement. When shorter work-sheets are used, the cover may be f hinged to the top edge of the wall.

The hinge is preferably constructed to hold the canopy in its normal effective positlon by a spring, and may havea detent latch, or it may simply have a counterbalance as by means of a spring.

Other features and advantages will hereinafter appear.

when the coveris releasablylatched in its extreme displaced position.

Figure 4 is an enlarged'plan View, partly in section, of the hinge-connection shown in Figure 3.

Figure 5 is a view, partly in section, of a fragment of'the novel cover, showing the construction of the lower edge thereof.

Figure 6 is a diagrammatic View in side elevation similar to Figure 1, showing a modified form of the invention.

' Figure 7 is an enlarged view in side elevation of the modified form of the hinge-connection shown in Figure .6.

Referring to the drawings, a typew'riting machine 10 may be fitted into an. enclosing sound-deadeningbox 11, which has its interior 12 lined with suitable sound-absorbing material such as felt, in order to reduce the objectionable noises produced during the typing operation. The box 11 may be of the form described in the co-pending application referred to above. a 7

Such dampening devices, however, will not wholly mufile the sound propagated upwardly from the machine 10, especially those sound waves which are produced by the type-heads l3 striking against the platen 14, and those produced by shifting the platenframe 15 in the carriage 16.

The invention effectively intercepts and absorbs these upwardly emanating noises, and may comprise a sound-absorbing cover or canopy 17 composed of an outer metallic shell 18 and an inner closely-perforated metallic shell 19, with a pad of sound-absorbing material 20 therebetween. The upper and side edges of the outer shell 18 may be clamped over the inner shell 19 to hold the members forming the cover 17 together, and a bar 22 may be suitably fastened, as by screws 23, to the lower edge of cover 17 on the inner side thereof to bind and to stiffen the same. The canopy 17 may be supported in a suitable manner, as

by a pivotal connection from the rear side of box 11 to extend upwardly and forwardly over the carriage 15.

The preferred form of cover 17 see F igures l and 2, comprises a lower upstanding fiat portion 24 normally spaced from and parallel to the rear side wall of box 11, to allow a long work-piece 25 to be moved therebetween by the platen-carriage 16 without interference, and an upper portion 26 of curved cross-section integral with the flat portion 24. The upper portion 26 extends forwardly over the platen 14, so as to act as a bafiie against which the noise-producing vibrations rising upwardly from the machine may strike to be absorbed. Where only ordinary or short length work-sheets are used, the cover 17 may be modified to form a single curved memberhinged near the top edge of the rear wall of box 11, as shown in Figure 6.

The lower corners of the outer shell 18 ma be formed with extending arms 27, which are bent forwardly and may be tapped to receive shouldered hinge-screws 28. In the preferred form of hinge-connection, shown in Figures 1, 2 and 3, bearing-plates 29 may be fastened at their upper and lower portions by suitable means, as screws 30, threaded into the side walls 31 of box. 11 close to the lower rear corners thereof. The upper portions of plates 29 may be of curved shape to conform with the outer edges of curved clearance slots 32, and their lower portions may extend rearwardly to form a pivotal connection with arms 27 of the cover 17 through the hinge-screws 28. Close to the outer ends of arms 27 stud screws 33 may be mounted to extend inwardly into box 11 through the slots 32. The free ends of screw-studs 33 may act as anchors for the ends of retractile springs 34:, the other ends of which may engage suitable fixed means, as screw-studs 35, fastened into the sides 31 of the box 11 close to the bottom edge and projecting inwardly thereof.

Slotted sector plates 36 may also be held by the screws 30 to have the curved slots therein coincide with slots 32 in the sides of box 11. The ends of the slots in sector plates 36 may act as stops for the studscrews 33 fastened to the arms 27 of cover 17 to limit the swinging displacement of the same.

To releasably hold the cover 17 in its extreme displaced position, flat detent-springs 37, shaped to correspond with slots 32, may be rigidly held by their lower ends over slots 32 by the lower set of screws 30, so that the upper ends of the springs 37 may be in the path of movement of the studscrews 33 to releasably engage the same when the cover 17 is moved to its extreme displaced position.

In operation of the preferred form, the cover 17 is swung backwardly, when it is required to give access to the top of the machine, on hinge-screws 28 against the action of the springs 3%. The cover 17 will be held in its extreme displaced position by the ends of the fiat springs 37, which engage the stud-screws 33. By a slight forward pull on the cover 17, the stud-screws 33 will he slipped over the ends of the springs 37, and thereafter the cover 17 will be automatically returned to its normal effective position by springs 34, see Figures 3 and 4.

In the modified form shown in Figures 6 and 7, a single member 38 may replace the bearing and sector plates of the preferred form, and may be attached in any suitable manner to the sides of box 11 as by soldering. In this arrangement the springs 3i merely act to balance the weight of the cover when it is in its displaced position.

.It will be particularly noted that the canopy has a width approximately the same as the width of the machine; that the printing position of the types, which are the noisy elements in the machine, is ventral of the width of the canopy; and that noise-producing vibrations rising to and intercepted by the canopy. are absorbed or dissipated through the co-operation of the fine perforated surface with the sound-absorbing felt inlay.

Broad claims directed to the specific construction of the perforated, sound-absorbing canopy will be found in my pendin applicagion, Serial No. 653,041, filed J uly 21, 19 3.

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

means for connecting said cover and said shell to allow the cover to swing across the machine from its normal effective position for giving access to the top of the machine.

2. In a typewriting machine, in combination witha sound-deadening box or similar device in which the machine sets, a soundabsorbing, open-ended cover overhanging the machine from the rear to intercept theupwardly-propagated noise-producing vibrations, without interfering with the typing operations, means for connecting said cover and said box to allow the cover to swing across the machine from its normal effective position to'give access to the top of the machine, and releasable detent-means to hold the cover in its displacedposition.

3. In a typewriting machine, in coinbi nation with a sound-deadening box or similar device in which the machine sets, a soundabsorbing, open-ended cover overhanging the machine from the rearto intercept the upwardly-propagated noise-producing vibrations, without interfering with the typing operations, means for connecting said cover and said box to allow the cover to swing rearwardly across the machine from its normal effective position to give access to the top of the machine, said means including a detent means to releasably hold the cover in its displaced position, and other means to urge the cover back to its normal effective position when manually released from said detent means.

4. In a typewriting machine, the combina tion with a sound-deadening box or similar device in which the machine sets, of a movable carriage to hold a work-piece for letterspace movement therewith, a sound-absorbing, open-ended canopy overhanging the carriage from the rear to intercept the upwardly-propagated noise-producing vibrations, without interfering with the typing operations, and means connecting the canopy to said box to permit the canopy to swing across the machine in a transverse direction to the movement of the carriage for giving access to the top .of the machine.

5. In typewriting machine, the combination with a sound-deadening box or similar device in which the machine sets, of a movable carriage to hold a work-piece for letter-space movement therewith, a soundabsorbing cover comprising a lower ortion positioned a spaced distance from tie outside of the rear wall of said box, and an upper portion extending over the carriage to intercept the upwardly-propagated noiseproducing vibrations, without interfering with the typing operations, and means connecting said cover to the rear wall of the box adjacent the bottom edge thereof to permit the cover to be displaced in a translar device in which the machine sets, of a sound-absorbing cover comprising an outer shell and a closely-perforated inner shell and having a sound-absorbing material disposed therebetw'een, said cover extending over the machine to intercept the upwardlypropagated noise-producing vlbrations, with-out interfering with the typing operations, and means to hold said cover 1n normal effective posit-ion. f

7. In a typewritin machine, the combination with a sound-deadening box or similar device in which the machine, sets, of a sound-absorbing cover comprising an outer shell and a closely-perforated inner shell, and having asound-absorbing material disposed therebetwee-n, said cover extending over the machine to intercept the upwardlypropagated noise-producing vibrations, without interfering with the typing operations, means for connecting said cover and the box to allow the cover to be displaced from its normal effective position for giving access to the top of the machine, detent means to releasably holdthe cover in its extreme displaced position, and means to urge the cover back to its normal-effective position when displaced therefrom and released from said detent means.

8. In a typewriting machine, the combination with a sound-deadening box or similar device in which the machine sets, of a movable carriage to hold a work-piece for letterspace movement, a sound-absorbing cover comprising an outer shell and a closely-perforated inner shell, and having a sound-absorbing material disposed therebetween, said cop er having a lower portion positioned a spaced distance from the outside of the rear wall of saidbox, and an upper portion extending over the carriage to intercept the upwardly-propagated noise-producing vibrations, without interfering with the typing operations, means connecting said cover to the rear Wall of the box adjacent the bottom edge thereof to permit the cover to be displaced in a transverse direction to the movement of the carriage for giving access to the top of the machine and to allow free movement of the work-piece with the carriage between the outside of the box and said cover, and means to hold said cover in nor mal effective position. a

9. In a typewriting machine, in combination, a movable carriage to hold a worksheet for letter-space movement therewith, and a sound-absorbing, open-ended canopy normally overhanging over the carriage from the rear to intercept the upwardlypropagated noise -producing vibrations, without interfering with the typing operations and spaced from the machine to permit free movement of the work-sheet with the. carriage between the machine and the canopy, said canopy being displaceable rearwardly across the machine from its normal effective position to give access to the top of the machine.

10. In a typewriting machine, in combina-" tion, a movable carriage to hold a Work-sheet for letter-space movement therewith, a sound-absorbing, open-ended canopy normally overhanging over the carriage from the rear to intercept the upwardly-propagated noise-producing vibrations, without interfering with the typing operations and spaced from the machine to permit free movementiof the work-sheet with the carriage between the machine and the canopy, said canopy being displaceable across the machine to the rear from its normal effective position to give access ,to the top of the machine, releasable detent means to hold the canopy in its displaced position, and means to urge the canopy back to its normal effective position when released from said detent means.

11. In a typewriting machine, in combination, a movable carriage to hold a worksheet'for letter-space movement therewith, a sound-absorbing, open-ended canopy normally overhanging the carriage to intercept the upwardly-propagated noise-producing vibrations, without interfering with the typing operations, said canopy being displaceable across the machine to the rear from -its normal efi'ective position to give access to the top of the machine, and means to counterbalance the canopy when in its displaced position.

12. In a typewriting machine including a carriage, the combination with a sounddeadening case enclosing the lower part of the machine, of a co-operating sound-absorbing canopy pivoted to the lower rear corners of the case in such a manner as to overhang and not enclose the carriage but movable rearwardly and downwardly across the carriage from an operative position to give access to the carriage to insert a work-sheet.

13. In a typewriting machine including a carriage, the combination with a sounddeadening case enclosing the machine on two sides and the rear, of a co-operat'rng soundabsorbing canopy pivoted at the lower rear corners of the case having a vertical section normally parallel to the rear wall of the case and formed integrally with a curved canopy section to overhang the carriage, the inner faces of both sections formed with a continuous perforated wall to intercept the sound-waves.

14. In a typewriting machine including a carriage, the combination with a sounddeadening case enclosing the machine on two sides and the rear, of a co-operating soundabsorbmg element pivoted to the lower rear corners of the case to extend upwardly and parallel to the rear of the case to terminate at a canopy to overhang the carriage, comprising a back section with turned-up edges to enclose sound-absorbing material and covered by a perforated front section to intercept the sound-waves and direct them to the absorbing element within.

15. In a typewriting machine including a platen, the combination with a sounddeadening case enclosing the machine on two sides and the rear, of a co-opcrating threepart sound-absorbing canopy pivoted at the lower rear corners of the case to overhang the platen, comprising a shell, sound-absorb ing material enclosed by the shell, and a perforated cover, all three combining to form a unitary open-ended sound-absorbing structure over the printing position.

MICHAEL J. CORCORAN, Administrator of the Estate of Cornelius B.

Coreoran, Deceased.

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