US1209456A

US1209456A - Type-bar rest.

Info

Publication number: US1209456A
Application number: US866936A
Authority: US
Inventors: Emmit G Latta
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-02-15
Filing date: 1914-10-16
Publication date: 1916-12-19
Anticipated expiration: 1933-12-19

Description

E. G. LA TTA. TYPE BAR REST.

APPLICATION 'r'ILED OCT- 16. 1914-.

Patented Dec. 19,1916. 2 SHEETS-SHEET] Iva /P223 77 7771 asses:-

TYPE BAR REST. APPLICATION FILED OCT. 16. l9l4.

Patented Dec. 19, 1916.

2 SHEETS-SHEET 2' fl%7'7?6g-$ mew/QM.

77977? eases 3- in their normal rest position.

EMMIT G. LATTA, 0F SYRACUSE, NEW YORK.

TYPE-BAR REST.

neoaaac. I

Specification of Llattcrs Patent. I Patented Bras, 1%, 19116.

@rigiiial application filed February 15, 1911, Serial No. 608,657. Divided and this application filed October 16, 1914. Serial No. 866,936.

Be it known that I, EMMrr G. LA'r'rA, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented a new and useful Improvement-in Type-"Bar Rests, of

which the following is a specification.

This invention relates to improvements in rests or back stops which'are employed in typewriting machines for arresting the movement of the type-bars when returning from their excursions to the platen, and for supporting the free ends of the type bars This application is a division of my application Serial No. 608,657, filed February 15, 1911, which has matured into Patent No. 1,115,077, dated October 27, 1914, and the invention is herein described and illustrated in connection with a front strikeor visible writing typewriter of the construction disclosed in said application, in which the typebars are pivotal y mounted on a segment that is adapted to be shifted for placing one or another of the difierentsets of type on the type-bars in printing relation to the platen. The invention is not, however, necessarily restrictedin applicationto a typewriter of this construction.

The object of the invention is to provide a type-bar rest or back stop of simple and practical construction which will eifecprevent the type-bars from reboundtually ing wh n theyreturn from the platen into engagement with the rest or back stop, and

which will also reduce to the minimum the noise incident to the contact of the type-bar 1 v with the back stop. or rest.

In the accompanying drawmgsrFigure 1 is a fragmentary longitudinal sectional elevation of a typewriti'ng machine provided with a type-bar rest or back stop embodying .the invention. Fig. 2 is a front "elevation,

art ly in section, thereof in line 22, Fig. 1. ig. 3 is a fragmentary front elevation of the back stop showing (exaggerated) the deformation thereof incident to the contact of a type-bar therewith. Fig. 4 is a rear elevation of one'end of the segment showing the manner of attaching the back stop thereto. r

A represents. the main frame of the machine; B the top plate thereof; C the platen carriage'which supports the platen c; E the type bars which are pivoted in an are be- -middle of the segment.

low the carriage so that the type-bars can swing upwardly and rearwardly to make the impressions at the front side of the platen; F the key levers and f one of the auxiliary levers operated thereby for actuating the type-bars; and G the segment or support on whlch the type-bars are pivotally mounted. The segment is movably mounted so'that it can be shifted vertically on a central arm h and two side arms h h the front ends of rear side of the segment. The side arms h h are rigidly secured at their rear ends to a rock shaft H which is suitably journaled at its ends on the opposite sides of the main frame, and the central arm h is forked and has the rear ends of its two branches pivoted in lugs k projecting upwardly from a bar k which is rigidly secured to the rear portion of the main frame and to which the rear ends of the key levers are pivoted. The segment-supporting arms are parallel and thus hold the segment upright in its normal and shifted positions. 1 represents a cam which are pivoted inslotted lugs 76 on the tel rock shaft 2' and is provided with a cam slot in which works a roller 91' journaled on a bracket 2' which is secured in any suitable way to and projects forwardly from the w These parts are preferably constructed and operate as shown and described in said application hereinbefore mentioned, but they could be of any a other suitable construction.

P represents the back stop, or'rest, for supporting the outer ends of the type-bars in the normal position thereof. This back stop is also supported from the segment so as to shift ,therewith, for instance, by posts {I which are rigidly secured to the ends of the segment in any convenient way and project forwardly therefrom. The back stop or rest, as shown in Fig. 1, preferably'consists of a chain composed of center blocks and side links pivotally connected by rivets, and is provided with a top strip or pad p of leather or other The suitable noise-preventing material. blocks and links meet on radial lines with only enough clearance to permit'a very limited movement thereof on the rivets, so that the back stop or rest retains a segmental form and only a limited flexing thereof is permitted. The end blocks are pivoted on the front ends of the supporting-posts p.

. the chainat both sides of that point, and this transmits a slight impulse to some of the adjacent type-bars so that their inertia is added to that of the chain to absorb the shock. The result is that the tendency of the type-bars to rebound is practically overcome.

In the use of a type-bar rest or back stop composed of a chain of links or connected blocks or weights as described, it has been found that when a type-bar returns from the platen intov contact with the back stop, sev- 'eral of the bars at each side of it move slightly toward the platen, showing that the chain is slightly flexed outwardly at the point struck, and straightens somewhat at each side ofthe returning bar, asindicated in Fig. 3, and that part at least of the force of the returning bar is transmitted to the adjacent bars which do not however ofl'er' enough resistance to cause the returning bar to rebound. The bars thus moved at opposite sides of the returning bar react on the chain to restore it. to its normal curve. The links of the back stop should be sufliciently heavy not only to cause the inertia thereof to absorb more or less of the force of the blow delivered by the returning type-bar, but prevent appreciable rebound of the returning type-bar by the reaction of the adjacent type-bars. The back stop or rest is flexible or adapted to'give under the blow of the returning type-bar but is practically free from rigidity and elasticity and its action is different from that which would result from the use of an elastic device such, for example, as a helical wire or spring. The back stop with properly proportioned parts prevents practically entirely even the slightest noticeable rebound and therefore overcomes the trouble. caused by the rebounding of the type-bars. It also eliminates practically all noise incident to the contact of the type-bars with the back stop.

The back stop or rest is preferably constructed of metallic links and faced with a strip of nonresonant or sound-preventing.

material, as shown, but the back stop could be composed in whole or in part of flexibly connected component blocks or links made of fibrous or other material having the minimum elasticity and of a non-resonant or sound deadening character without departing from the invention, and. the back stop could be of still other construction comprising a chain or series of separate blocks, links or units flexibly connected to form a continuous flexible and substantially inelastic rest for the type-bars.

It will be apparent that the back stop or rest described can be attached to a nonshifting segment or otherwise mounted in the machine, and is also applicable to ma chines ofdifferent construction from that shown in the drawings.

I claim as my invention: 1. The combination with a series of movl able type-bars, of a flexible backstop suspended from its ends and comprising a plurality of separate rigid parts flexibly connected end to end to form a yielding substantially inelastic rest for the type-bars.

2. The combination with a series of movable type-bars, of a jointed, flexible, substantially inelastic back stop for the type-bars suspended by its ends.

3. The combination with a series of movable type-bars, of a flexible articulated, substantially inelastic back stop for arresting the type-bars as they return to normal position, said back stop being constructed and adapted to distribute some of the force of the returning bars to other bars of the series.

I 4. The combination with a series of movable type-bars, of an articulated back stop of rigid component sections for arresting the type-bars as they return to normal position having a surface of non-resonant character for contact with said type-bars.

5. The combination with a series of pivoted type-bars, and a supporting" segment therefor, of a curved, flexible articulated, substantially inelastic back stop for the typebars pivotally connected in fixed relation to' the segment.

6. The combination witha series of movable type-bars, of an articulated back stop for arresting the type-bars as they return to their normal position, suspended from its ends, and a continuous strip'of noise-deadening material arranged on the back stop for the engagement of the type-bars.

7. The combination with a series of movable type-bars, of a back stop for arresting the type-bars as they return from the platen comprising a chain of pivotally connected links and having a yielding surface for the engagement of the type-bars.

8. A type-bar rest consisting of a flexible chain suspended by its ends and comprising a series of separate flexibly connected blocks.

9. A type-bar rest consisting of a flexible chain suspended by its ends and comprisinga series of separate pivotally connected blocks. I

10. 'A type-bar rest consisting of a flexible chain suspended by its ends and composed of a series of separate blocks flexibly connected "so as to have a limited movement relative to each other.

incense 11. The combination with a. series of pivoted type-bars, and. a shiftablesupporting segment therefor, of an articulated backstop for the type-bars suspended by its ends from supports on said segment.

12. lihe combination with a series of pivoted type-bars, of a back-stop for intercepting the type-bars as they return to their v normal position comprising a chain of pivotally connected rigid links.

13. The combination with a series of typebars, of a back-stop for intercepting the type-bars as they returnto their normal position comprising a chain of links pivotally ber, 1914:.

EJNHVHT G. LATE-A.

Witnesses:

ELMER E. STANTON, LEONARD '1. How.