US1552039A - Typewriting machine - Google Patents

Description

Sept, l, l 925.

1 d. AB. coRcoRvAN l TYPEWRI TING MACHINE Fild June 26, 1924 lio ' sheet, the type-heads springing APatented Sept. 1, 1925.

j UNITED STATES PATENT OFFICE.

vCORNELIUS BL CORCRAN, DECEASED, LATE -OF NEW YORK, N. Y.; BY MICHAEL J. CORUORAN, ADMINISTRATOR, OAF NEW YORK, N. Y., ASSIGNOB T0 UNDEBWOOD TYPEWBITEB COMPANY, 0F NEW YORK, N. Y., A CORPORATION 0F DELAWARE.

4rnurwm'rme MACHINE. I.

appnoauon ma :une ne, m4. serial Na. 129,482.

To all whom z't may concern:

Be it known that CORNELIUS B. CoRoonAN, deceased, late a citizen of the United States, and late residing in the boron h of Bronx, county of Bronx, city and tate of New York, invented certain new and useful 1mprovements in Typewriting Machines, of which`the following is a specification.

This invention `relates to typewriting machines of the front-strike type, in which the type-bars are mounted on a curved wire carried by a segment. Usually the blows of the type-bar are stopped, just before contact of the t pes with the platen, by a rigid rtion o the type-bar segment to avoid t le tendencyof the type-bar to chatter and make repeated 'impressions on a workbeyond a stop suliciently to deliver a whip-like blow upon the work-sheet.

Such impact of the metal surfaces pro# duces an annoying clattering noise of considerable intensit and it is therefore one of the features o this invention to provide an improved separate stop .designed to deaden` such sounds without lessening the advantages of a rigid anvil or type-bar stop l formed directly on the segment.V

It is a further feature to provide a stop readily removable when worn, that is moderately ieldable, tending to reduce the shock ofY the type-bar and preventing it .from being transmitted to other parts of the machine, thus further reducing the noise can be readily applied without any changes in the typewriting machine.

These features are accomplished by securing a segmentalsprin sto upon the face of the segment, in which t e type-bars are pivoted, making use of openings which already exist therein for attaching purposes, the stop being provided with sound-reducing means known to be effective and so mounted as to prevent the emission of noise to a marked extent.

Other features and advantages will hereinafter appear.4

In" the accompanying drawings,

Figure 1 isa front elevation of a typei, bar segment as used with a machine of the Underwood type, showing an embodiment of the ,inventlon as applied, the platen ap caring in dot-and-dash lines.

igure 2 is a transverse sectional view of the same, the section being taken on line 2-2 of Figure 1, and a type-bar shown in dotanddash` lines as connected to the segment, both in raised and lowered Fi nre 3 is a view similar to igure 1, but s owing a modified form of the stopbar anvil.

Figure 4 is a transverse sectional view, taken on' line 4 4 of Figure 3.

In the accompanyino drawings, such parts of a typewriting machine are shown as relate only to the invention, all other parts beingof ordinary construction and unrelating'to this disclosure.

he platen, generally designated by the numeral 10, is of the cylindrical type, shift- 1positions.

able into upper andlower case position to receive the impact from the type .characters carried on type-heads 11, these heads bein fixed on free ends of type-bars 12 pivote on a rod 13 and actuated by links 14 engaging the'bar's near their pivoted ends.

The type-bars shown are of the Underwood style, andthe links 14, as will be understood, are moved by their connections with key-actuated levers on the keyboard of the machine in the ordinary manne/r, such parts being omittedl from the-.drawings The rod 13 is mounted in the lower part of a type-bar segment 15, the same having slots 16 to actuate the type-bars 12 and an extending rib 17 adjacent to which the type- .barsmove when in position to make an impression on the platen. The segment 15 is fixed rigidly by screws 18 to a front portion of the typewriting` machine frame, indicated by the numeral 19, the construction of the machine'being well known.

As shown in Figures 1 and 2, a stop comprising two similar but oppositely-'disposed stop, and to further reduce the noise the slightly offset towards the supporting sur-V face \20, or, if preferred, provided with washers 28, to raise the smooth' lever under surface of the stop slightly away form the surface 20, such offset presenting a space of only a few thousandths of an inch' in extent, and passing through a perfora- `tion in' each pad are binding screws 29 hold,- ing the stop firmly in engagement with the segment. i"

From. the foregoin it will be clear that when a type-bar stri es the stop, the stop, will be momentarily deliected to make contact with the face of the segment, recoverying instantlyafter the impact, such yielding of the stop in no wise interfering with its arresting eifect, but serving to cushion the blow to prevent sound emission, suchl silencing effect being increased dueto peculiarity of its structure.

fn `the modificationshown in Figures 3 and 4, the stop 31 is integrally formed from a single piece of metal having broadly curved ends 32 from which extend arms 33 spaced closel their ends 34 through which pass screws 35" securing the stop spaced from the face of the segment 15 in the manner before described.

The inner adjacent side of the stop contains a plurality of closely-spaced openings 36 extending partially through the material of the stop, and set firmly in. each opening isa plug37 of relatively soft, dense material, as lead, actfing to reduce the vibrant quality of the metal stop and to correspondingly lessen the sound of thetype-bar blow I scope of the Y tance therefrom, said stop having a plurality ofV closely spaced recesses in its under surface, said stop being mounted to spring against the sup ort when struck by a typebar, anda lea plug' fixed in each of the mentioned recesses. f n

2. The combination with a typewriting machine having type-bars and a segmental concentric to the curved f klower edge o the stop, and being offset at support therefor, of an arcuate stop having spring arms secured at their ends to the face of the support, means for spacing the stop and' arms slightly from the support, and means in the stop to reduce sound upon its being struck by a type-bar.

`3. The combination with a typewriting machine havingy type-bars and a segmental presenting a relatively narrow contact surface and containing a plurality of openings in its iower surface, arms integral with the ends of the stoo said arms being curved to extend alon'rioe the convex edge of the stop towards each other, and provided with openings to receive securing means engagedy in the support, means at the ends of the arms to raise the stop minutely from the surface of the support, and leaden plugs fixed ,in the mentioned openings.

5. The combination with a typewriting machine having type-bars and a segmental support therefor, of a stop shaped to conform with the support and intercept each of the type-bars at their impression strokes, said stop'being composed of two like sec@ tions arranged in opposed relation, each section having. openings in their under surfaces and re-entrantly turned arms at their ends, means at the ends of the arms by which the stop may be secured to the support, other means for holding the stop minutely spaced from the support, and means for unitingy the 'adjacent ends of the stop sections.

6. The combination with a typewriting machine having type-bars and a segmental support therefor, o-f a stop' shaped to conform with the support and intercept each of the type-bars at their impression strokes, said stop being composed of two like sections arranged in opposed relation, each section having openings in their under surfaces and reentrantly turned arms at their ends, means to spacedly secure the arms to said support, and a plate riveted to the inner adjacent ends of the sections, said late being level with the under'. surface o the stop. Y

f MICHAEL J. CORCORAN, Administrator of the estatey of @ormz'us B.

Corcoran, deceased'.

type-bars at their impression strokes,said stop d

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