US 1985307 A
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Patented Dec. 25, 133934 ENCILS ADJUSTABLE R'UllBER ERASR FOB LEAD william F. naast. casper, Wyo. Application November 13, 1933, Serial No. 697,734
This invention relates to improvements in erasers adapted for use with lead pencils, but' when so used the pencil becomes a suitable holder only, as any other device of propershape would be equally effective in the eraser assembly. In other words, the fact that the holding device as shown inthe drawing is a lead pencil has no special significance in the combination. Hence, whenever the term pencil is used in the speciill0 cation, it must be understood as suiliciently comprehensive to cover any suitable device of proper shape and strength to perform `the desired function. The reason a lead pencil is used in the drawing is because it is believed that theprincipal use of the device will be with lead pencils. Pencils having erasers attached to one end have been known for along time, but the erasers have always been too short to last as long as the lead pencil with the result that long before the lead pencil is worn out, the eraser will be useless.
Itis theobject of 'this invention to produce an eraser assembly in which the eraser shall be much longer than that ordinarily employed and which shall be calculated under ordinarycir- 2liv cumstances to last during the life of the pencil,
if employed therewith.
Where a long slim rubber eraser is attached to a pencil, it needs some means for steadying' it because it vwould be too iiexible to be successfully operated without some/supporting means, and another object of this invention is to provide an eraser assembly in which a sleeve is rotatably secured to the assembly in such a way that a portion of the sleeve overlaps the eraser and another portion the adjacent end of the Apencil. The sleeve is usually provided with threads on its inner surfacev that engage corresponding threads on the pencil and'jherefore when .the sleeve 'is rotated, it will also move longitudinally, thereby making it possible to exspose as much ofthe eraser as may be foundnec- The above and other objects that may become apparent as this description proceeds are attained by means of a constructionand an arrangement ot parts that will now be described in detail, andfor this purpose reference will be had to theA accompanying drawing in which the preferred embodiment ofthe vinvention has been illustrated. and in which: viIlllg'. 1y is a side elevation of my improved de- Fig. 2 is a-side elevation showing the protecting sleeve in section; 65 Fig. 3 is a section taken on ,wie Hrm. n.
(Cl. 1Z0-38) Fig. 4 is a transverse section taken on line 4 4, Fig. y3; and
Fig'. 54 is a view similar to that shown in Fig.
2, but showing a slightly modied form of construction. 5
In the drawing reference numeral 6 indicates a pencil which is made of wood and constructed in the ordinary manner. fThe lead has been designated by reference numeral 7, though it has no signiiicance except to show the adaptation of the 10 device. One end of thepencil is provided with a wedge-shaped notch 8 for the reception o f the wedge point 9 of the eraser 10. vThe eraser is made from India rubber of the composition usually employed for this purpose 'and is glued to the l5 sides of the notch in the end of the pencil. In -the embodiment shown in Figs. 1 to 4, the pencil is provided with threads l1 on its outer surface and rotatably connected with the threaded end of the pencil is a protecting sleeve 12. The sleeve 20 is provided with threads 13 on its inner surface which cooperate with the threads'll sothat whenever the sleeve is turned, it will move longitudinally. f The outer end of the sleeve is provided with a cylindrical portion 14 whose inside diameter 25 is of the proper size to'receive the eraser and by properly positioning the sleeve the proper amount,
of eraser can be left exposed and as this wears, the sleeve can be rotated so as to expose still more of the eraser and inthis manner the eraser 30 can be used until it is\ entire1y worn out, but will always have proper support for successful operation.
In Figs. Lto 4 the eraser has lbeen shown as secured to the pencil by means of glue or. cement, 9.5 andl this requires that a notch be cut in the end of the pencil.l` This construction also requires ,the outer surface ofthe pencil to be provided with .threads for cooperating with the threads on the protective sleeve. P 40 In Fig. 5 a slightly modified form of constructionihas been shown. ,In this construction the eraser 10 has its inner end secured in a connector 15 whose other end` 16- is secured to the 45 end of the lead pencil and heldin place .by an indentation -17. That portion of the connector between the cylindrical ends 15 and 16 `is threaded as indicated at 18 and the protectingsleeve'is so constructed that its threads will engage with the threads 18.. When the construction shown in Fig. 5 is used the assembly comprising the eraser, the connector and the protecting sleeve can be made and assembled and then applied to the end of the lead pencil or other-holder in the same mannerv as is now common practice in connection' with the usual erasers.
It will beseen from the drawing that by this construction an eraser of any length can be employed and that by merely rotatingthe protective sleeve, a greater or less portion o! the eraser can be exposed and as the eraser wears, the sleeve can be moved downwardly and will serve to support the eraser at all points so that it can be usedy the ordinary eraser now em- 1,9s5,3o7 l provided with a transversely extending notch,
an eraser having one end. wedge-shape andl inserted into the' notch and a tubular sleeve surrounding the eraser and the notched end of the holder, the, sleeve having internal threads which are so dimensioned that they will'indent the outer surface of the holder to form a threaded engagement therewith, the outer end o! the sleeve having a cylindrical Lportion whose inside diameter is the same as the inside diameter of the threaded opening, the diameter of the eraser being substantially equal to the inside diameter of the cylindrical portion whereby the latter will steady the eraser.
WILLIAM F. BOAST.