US1298639A - Eraser structure. - Google Patents

Description

J. AULD. ERASER STRUCTURE.

APPLICATION FILED FEB. 6 1919.

Patented Apr'. 1,1919.

i '.ENTTED J AU'LD, OF CHICAGG, ILLINOIS.

ERASER STRUCTURE.

To all 'whom t may concern:

Be it known that I, JOHN AULD, a citizen of the United States, and a resident of Chicago', in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Eraser Structures, of which the following is a specication.

My invention relates to eraser structures, and particularly to improved holders and brush attachments therefor.

Although my invention may be employed in connection with different types of erasers, it is particularly desirable in connection with the circular disk type of eraser.

The object of the invention is to provide a sheet metal supporting frame for the eraser, together with a handle or holder hinged to the fra-me, for affording better hold for guiding and steadying the eraser and for permitting more accurate use thereof. The handle or -holder structure may have a brush secured thereto, and another feature of the invention -involves the irnprovement of forming the brush.

The various features of the invention are shown in the -accompanying drawings, in which* Figure 1 is a side elevational view of the eraser structure, involving an eraser disk, supporting frame and handle.

Fig. 2 is an edge view of the structure of Fig. 1.

Fig. 3 is a side elevational View showing a brush secured to the holder.

Fig. 4 shows a modified form of supporting frame.

Fig. 5 is a sectional View on line 5 5 of Fig. 4.

Figs. 6, 7 and 8 show various steps in the formation of the brush and holder, and

Fig. 9 is a plan view of another form of the eraser structure to which my invention is applied.

Referring to Figs. v1 and 2, the eraser structure comprises the circular rubber disk 10, the supporting frame 11 and the wire holder 12. The supporting frame is of sheet metal and is of U-shape. The limbs of the frame have at their ends openings for registering with the center opening usually found inl circular eraser disks, a tubular rivet 13 extending through the openings to secure the eraser disk to the frame for rotation therein so that different surfaces of the Specification of Letters Patent.

Patented Apr. 1, i1919.

Appueatien sied February e, 191s. serial No. 275,478. y

eraser may lbe presented for use. The holder 12 is of U-shape and is bent from a piece of wire, its ends 14 and 15 being deflected inwardly into coin-cident lines to form pivot trunnions. The frame 11 at itsV bend iS formed to provide the opposite pivot openings 16 and 17 for the trunnion ends 14 and 15. The wire holder is normally sprung so that when it is applied to the supporting frame its sideswill be spread apart to afford spring pressure against the supporting ',frame. It is very desirable that when the eraser 'is not in use the holder should assume a neutral position to lie in the plane of the eraser disk, but to yield t0 swinging movement so that the structure can be readily grasped and its parts swung relatively during use.

'In Figs. 1 and 2 this is accomplished by I diagonal cutting away of the corners at the bend of the supporting frame 11, thus leaving diagonal cam surfaces which cause spreading apart of the holder sides when it is swung, the tendency being then to keep Vthe holder extending away from the frame and in the plane thereof.

, In Fig. 3 the holder 12 is shown supporting the brush cup 18 from which the bristles 19 extend andadditional means in the form of a thin flat spring 20 is provided for keeping the holder yieldingly in neutral position. This spring is shown secured to the cup18 at its upper end, extends at its lower end between the sides of the frame 11 through the notch 21 formed in the bend of the frame. When the brush is to be used for cleaning purposes the eraser structure may be held by the frame 11. The flexible yielding or spring hinge connection of the brush holder and the frame permits a more yielding and softer application of the brush to typewritten documents.

'In the arrangement of Figs. 4 and 5 the eraser disk 10 is reinforced by the side plates 22 and 23, secured together by the tubular rivet 24 and the frame 11 has detachable connection with the eraser, and at the ends of its limbs has the beads or projections 25- spreading apart of the frame when the f of bristles .at the holder 12 is swung, and only the spring 20 is relied upon forlkeeping the holderv nor- Inally in its neutraliposition. Y

In Figs. 6, 7 and 8 the manner of forming the holder and formingandhsecuringr the A lengthof. vwires brush thereto is shown. first bent into the form of a hairpin, andits bent end is slipped through the opening 27" Y in thefbasef ofthe cup 18.- A bundle `ofbristles 29 is then inserted .throughtheA bend of d thewire and the Wire then pulled doWnw wardly into .the cupgthus bending the bundle middle'andbringing the l two ends thereof/together to form the brush. k.The cupk is then `flattened to secure the bristlestherein and theends of the wireare then bent to formshoulders 30y and 31 forengag- ,ingiwitlr the cup to prevent displacement thereof.Y The wire is then further benty to formits.parallel sides andthe trunnion ,-,end'sll andf15; Y v d `gFig,.5 shows more clearlythe manner, of I v"securing the` Spring 520, the upper and of the spring being inserted .through thejopening 27 to be clamped-land,` secured when the cup is; flattened; i When they holder is appliedto ,they supportinv frame 11 the lower end of i .the -sprlngis s ipped through the slot, 21v into position between the frame sides.

y In Fig. 9 my improved brush holder is shown appliedto an eraserof the flat oblong type, inwhich' a strip '32. of `erasing, rubber isA adjustable within the rectangularv frame 33. `,Theframe is provided with opposite openings 34 and 35 at one end forreceiving 'the turnedinends 14; and 15 ofthe holder 12, which may or may not have a brush secured thereto.

precision. Whenevery theA eraser is released from the hand' the yspring hinge connection between the frame andholder willlcause. the holder to extend outwardlyy inthe plane of Cpiesof this vpatent maybe obtained for 'come within the scope of the invention.

the eraser disk so that the eraser structure is ialways in proper position to vbe taken in I do not desire to be limited to the exact constructions" and arrangements herein described and referred to, as changes and modifications can no doubt be made and still I yclaim as follows: Y. 1.The-co1nbination with an eraser, of a supporting framey therefor, and a handle spring hinged thereto. d v

2. A supporting :structure for erasersvr comvprisinga"U-shapedframe for receiving the eraser.v betweenitsends, and `a holder hinged to said frame at'the bend thereof. l

3. A supportingstructure for erasers comprising a lU-shapef frame forl ,clamping an eraser between.fits;ends,ra holder hinged to said frameto form-an extension thereof, and a brush securedto-said holder.

4.Y A supporting structure for erasers comi prising a U-shapedframe forclarnping an A, eraser between itsends, a wire holder hinged to the end of said frame toform an extension thereof,.and yielding means normally y...

holding saidv holder ,extended and in the plane of said frame. l y d d' 5.` A'L supporting structure for erasers comprisingy a U-shape clamping frame, a holder hinged tosaid frame at its bend to form continuation thereof, and` a ,spring-1 extend- `.ings between said holder and frame tending toy hold saidholder. extendedin the plane of said frame.

. 6. A supporting structure for erasers com- -V prising a U-shape framefor clamping` an eraser between its ends, a U-shape holder havingits ends insertedinto jthe opposite ends of the bend of saidl U-frame, whereby said holder is hingedtosaid frame to form a continuation thereof, the corners at the bend of said frame being cut away diagonally to presentV cam surfaces to the end of said holder wherebysaid holder will normally be heldA extended from and in the plane of said frame. Y

In witness whereof, I `hereunto subscribe my name this 3rd day of February, A. D., 1919; i

Jol-IN AULD.

ive cents each, by addressing the Commissioner of Patents, Washington, 20.6.

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