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Publication numberUS2224083 A
Publication typeGrant
Publication dateDec 3, 1940
Filing dateApr 14, 1939
Priority dateApr 14, 1939
Publication numberUS 2224083 A, US 2224083A, US-A-2224083, US2224083 A, US2224083A
InventorsCary Myers Lewis
Original AssigneeRoyal Typewriter Co Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Typewriting machine
US 2224083 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

c. 3, i940. L.. c. MYERS TYPEWRITING MACHINE Filed April 14, 1939 wwwa@ Lew/"s @Myers Y a img Patented Dec. 3, 1940 PATENT oFFICI-:

TYPEWRITTNG MACHIN E ,Lewis Cary Myers, Freeport, N. Y., assignor to Royal Typewriter Company, Inc., New York, N. Y., a corporation of New York Application April 14,A 1939, Serial No. 261896 13 Claims.

This invention relates to typewriting machines, and more particularly to typewriter type bar rests.

Typewriters now most generally used` include .i sets of type bars movable individually from at rest positions into printing position in contact with a work sheet positioned on a platen or cylinder, from which they rebound or are retracted to come to rest on a support generally known as l` a type bar rest or type barv head rest. In the interest of quiet operation, it is desirable that theA impactof the type bars upon the type bar rest be cushioned; and in the interest of smooth and l rapid operation it is desirable that rebound of the l type bars from the type bar rest be avoided. Cushioning of the impact by means heretofore known has been accompanied by an undesirable amount of repulsive response of the type bar head rest, resulting in rebounding of type bars. Type bar rebound may cause type bar collision which interferes greatly with speedy machine operation.

An object of this invention is to provide a` typewriter type bar rest which has a low degree of springiness or repulsive response to type bar impact, and, at the same time, a high degree of sound-deadening capacity. 1

Another object-is to provide a type bar rest of the character referred to which comprises means providing and utilizing the cushioning and sound-deadening effect o-f-a plurality of air film-s.

A further object is to provide a typebar rest including a plurality-of curved laminae loosely held in assembled relation and mounted on a relatively rigid part of a typewriting machine in a novel and"h improved manner. A

Other objects will become apparent `from a reading of the following detailed description, the appended claims, and the accompanying drawing, in which:

Figure 1 is a fragmentary View partly in section and partly in elevation showing parts of a front strike typewriter equipped with a type bar rest embodying the invention;

Figure 2 is a longitudinal sectional view of a type bar rest embodying the invention, and drawn on an enlarged scale;

Figure 3 is a cross sectiontaken on the line 3 3 of Figure 2;

Figure 4 is a perspective view of a lamination forming part of the improved type bar rest;

and

Figure 5 is a crosssectional view of a tubular cover for encasing partsof a type bar rest.

The invention is illustrated as being embodied 5y.,v in a ARoyal Standardv front strike typewriter,

but it will be understood that typewriters of other kinds may be equipped with type bar rests embodying the invention. The typewriter partly shown includes the usual type bar segment A supported on a main frame `(not shown) and a plurality of type bars C (only one of which is shown) pivotally mounted as at B and each being equipped with a type head D. The type bar C is shown in full lines in Figure 1 in its at rest position with the head D supported on. atype bar 104 rest, generally designated E, embodying the present invention. Thel type bars are adapted to be swung upwardly to the printing position, indicated in dotted lines in Figure 1, with their heads g in front of a platen F mounted on a carriage G. 15

When in this position the type bars engage an abutment H on the segment A and the platen F mounted on the carriage G. l

The type action associated with each type bar includes the usual pivoted key lever I connected 20 by a short link J to a pivoted front link K conv nected by a link L to a pivotally mounted' intermediate lever M. The upper end of the lever M is connected to the type bar heel by means of a rear link N, and a link O provides operating con- C25 nection between the intermediate lever M and a universal bar P. A returning spring Q is connected between the lever M and guided by the link O to a spring anchor R. The typewriter shown' includes the usual letter spacing mecha- 30 nism, part only of which designated S is shown. When the key lever I is depressed the type bar C will be` swung upwardly and rearwardly to the position shown in dotted lines in Figure 1,l and when the key lever is released the type bar will 35 rebound from the platen and abutment H' and,v

member I secured to the segment A by suitable means such as mounting legs 2 which position the supporting member in front of and in spaced relation to the segment. Preferably the edge of y50 the supporting member l remote from the segment -is formed with a flange 3.

'I'he curved member l supports an assembly generally designated 4 adapted to be engaged by andto supportfthe type bars, the construction being such that the assembly has a very low `degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity. The assembly includes a core comprising a plurality or multiplicity of laminae 5 of wide thin strip material loosely laid' together and having their wide surfaces 6-6 curved, that is, non-planar, and in face-to-face relation. The narrow edge surfaces 1 1 of the laminae may be planar. Laminae of uniform thickness and width are shown, but laminae of varied thickness and width produce good results. The laminae may be of any of various metals, such as steel, copper, or brass, or of bre or composition; or combinations of strips of different materials may be employed.

Although it is desirable that the laminae be laid together loosely, it is, of course, necessary that they be held surely in assembled face-toface relation. In the illustrative and preferred form shown, the laminae are encased in a cover 8 of soft pliant fabric material, which loosely embraces the laminae. The cover, which constitutes the sole means for holding the laminae in assembled relation, may be formed as a tube closed longitudinally by a line of stitching 9 positioned adjacent the flange 3 and closed at its ends by stitching lll-lll. The encasing cover 8 may also be in tubular form as shown in Figure 5.

The laminae, although of relatively hard material as compared to the cover 8, are interleaved with air spaces producing a cushioning effect which minimizes the transmission of returning type bar impact to the supporting .member l, segment A, and main frame. However, if the type bars were allowed to impinge directly upon the topmost lamination, the impact would result in a distinct click. The layer of soft pliant fabric above the laminated assembly prevents the clicking. It has been determined' by comparative tests that these desirable characteristicssilencing of impact and elimination or lessening of rebound-are attained much more eifectively when using an assembly as described above than when using even a thick felt or fabric type bar rest. Such a thick fabric or felt rest, heretofore known, causes objectionable type bar rebound.

The relatively thin fabric cover 8 preferably is protected against wear by a protective facing Il of soft pliant material which is relatively tougher and more durable than the cover material. Leather has been found to possess the necessaryV pliability and resistance to wear. The leather facing is attached to the top of the cover and laminae assembly at spaced points by tie` threads l2 which pass through the facing and through the immediately adjacent and' abutting portion only of the cover 8. Thus the tie threads do not draw the cover tightly about and do not disturb the loosely-laid character of the laminae assembly. Similarly the laminae and cover assembly is attached' to the supporting member I at spaced points by tie threads I3 which pass through the lsupporting member and the immediately adjacent and abutting layer only of the cover.

In operation a type bar returning from printing position will fall upon the rest and will come to a dead stop almost immediately, creating only a slight noise and' not rebounding to any appreciable or objectionable extent. Both silent and rapid operation are thus enhanced.

The construction disclosed herein embodies the invention in its now preferred form, but changes may be made without departing from the invention as d'ened in the claims.

I claim:

1. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type bar rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality of laminae of wide thin strip material loosely laid together and having their wide surfaces curved or non-planar and in face-to-face relation, and a soft pliant cover encasing said laminae.

2. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type bar rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality of laminae of wide thin strip material loosely laid together and having their wide surfaces curved or non-planar and in face-to-face relation with sound-deadening air spaces therebetween, and a soft pliant cover encasing said laminae.

3. In a typewriter having asset of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type bar rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality of laminae of wide thin strip Vmaterial loosely laid together and having their Wide surfaces curved' or non-planar and in face-to-face relation, and a soft pliant cover encasing and loosely embracing said laminae, said cover constituting the sole means for maintaining said laminae in assembled relation.

4. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said' type bars adjacent the free ends thereof, said type bar rest having a low degree of springiness or repulsive response to type bar impact and' a high degree of sound-deadening capacity and comprising a plurality of laminae` of wide thin strip material loosely laid together and havingl their wide surfaces curved or non-planar and in face-to-face relation, a soft pliant cover encasing said laminae, and a protective facing of soft pliant material on the type-bar-supporting curved surface of the laminae and' cover assembly, said protective facing material being relatively tougher and more durable than the cover material. i

5. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type bar rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality of laminae of wid'e thin strip material loosely laid together and having their wide surfaces curved or non-planar and in face-to-face relation, a soft pliant cover encasing said laminae, and a protective facing of soft pliant material on the type-bar-supporting curved surface of the laminae and cover assembly, said protective facing material being relatively tougher and more durable than the cover material and being secured to said cover by means extending through the facing and the immediately adjacent and abutting portion of the cover.

6.V In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type bar rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality of laminae of wide thin strip material loosely laid together and having their wide surfaces curved or non-planar and an in face-to-face relation, a soft pliant cover encasing said laminae, and a protective facing of soft pliant material on the type-bar-supporting curved surface of the laminae and cover assembly, said protective facing material being relatively tougher and more durable than the cover material and being loosely laid upon the cover and lightly connected thereto at spaced points by tie threads extending through the facing and the immediately adjacent and abutting portion only of the cover.

7. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said' type bars adjacent the free ends thereof. said type bar rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality of laminae of wide thin strip material loosely laid together and having their wide surfaces curved or non-planar and in face-to-face relation, and layers of soft pliant material in face-to-face contact respectively with the opposed outside curved surfaces of the laminae assembly.

8. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type bar rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality of laminae of wide thin strip material loosely laid together and having their wide surfaces curved or non-planar and in face-to-face relation, a layer'of soft pliant material in face-to-face contact with the type-barsupporting curved surface of the laminae assembly, and a protective facing on said layer and comprising material which is soft and pliant but which is relatively tougher and more durable than the material comprising said layer.

9. In a typewriter having aset of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type bar rest comprising a curved supporting member; a plurality of laminae of wide thin strip material loosely laid together and having their wide surfaces curved or non-planar and in face-to-face relation; a soft pliant cover encasing said laminae; and means holding said laminae and cover against displacement from said supporting member without drawing the cover tightly about said laminae.

10. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type bar rest comprising a curved supporting member, a plurality of laminae of Wide thin strip material loosely laid together and having `their wide surfaces curved' or non-planar and in face-to-face relation; a soft pliant cover encasing said laminae; and means holding said laminae and cover against displacement from said supporting member comprising tie-threads passing through the supporting member and through the immediately adjacent and abutting portion only of the cover.

11. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged b-y said type bars adjacent the free ends thereof, said type bar rest comprising a curved supporting member; a plurality of laminae of'wide thin strip material loosely laid together and having their wid'e surfaces curved or non-planar and in face-to-face relation; a soft pliant cover encasing said laminae; means holding said laminae and cover against displacement from said supporting member comprising tie-threads passing through the supporting member and through the immediately adjacent and abutting portion only of the cover; a protective facing of soft pliant material on the type-bar-supporting curved' surface of thev laminae and cover assembly, said protective facing material being relatively tougher and more durable than the cover material, said protective facing being loosely laid upon the cover and being lightly connected thereto at spaced points by tie-threads extending through the facing and the immediately adjacent and. abutting portion only of the cover.

12. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged by said type bars adjacent the free ends thereof, said type rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality'of laminae of wide thin strip material loosely laid together and having their wide surfaces curved or non-planar and in face-to-face relation, and a soft fabric cover for said laminae.

13. In a typewriter having a set of pivoted type bars, a type bar rest positioned to be engaged b-y said type bars adjacent the free ends thereof, said type bar rest having a low degree of springiness or repulsive response to type bar impact and a high degree of sound-deadening capacity and comprising a plurality of laminae of wide thin strip material loosely laid together and having their wide surfaces curved or nonplanar and in face-to-face relation.

LEWIS CARY MYERS.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2605880 *Dec 29, 1950Aug 5, 1952IbmType bar rest
US4984917 *Oct 31, 1986Jan 15, 1991Mannesmann AgLaminated platen bar for noise attenuation in matrix printers
Classifications
U.S. Classification400/455
International ClassificationB41J7/22, B41J7/00
Cooperative ClassificationB41J7/22
European ClassificationB41J7/22