US 806235 A
Description (OCR text may contain errors)
No; 806,235. PATENTED DEC} 5, 1905. I A. F. W. BOWEN.
RUBBER HOLDING ATTACHMENT FOR PENGILS APPLICATION FILED DEC. 2, I904.
P T OFFICE.
ANNIE F. W. BOWEN, SAN FRANCISCO, CALIFORNIA.
RUBBER-HOLDING ATTACHMENT F OR PENCILS.
Application filed December 2, 1904. Serial No. 235,265. I
To-all whom, it may concern:
Be it known that I, ANNIE E. W. BOWEN, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented'certain new and useful Improvements in Rubber-Holdingin g is a specification.
Thls lnven tion relatesto an 1m provederaser- Attachments for Pencils, of which the follow holder for pencils, the object of my invention being to provide a device of this character in which the eraser will be securely held and in which it can be adjusted to compensate for Wear in the eraser and also to allow any desired portion thereof to project from the holder.
the holder, the rubber being removed.
Referring to the drawings, 1 represents a holder which is made out of metal, preferably sheet metal of a suitable thickness. Said holder comprises a smooth cylindrical part 2,
v by which it is secured to the end of the pencil 3, and a threaded cylindrical part 4, which holds the eraser 5. The part 2 of the holder is secured to the end of the pencil in any suitable manner, as by means of a stem6, screwed through a hole in said cylindrical portion and having a milled head 7, by which it can be turned, the inner end of the screw having a foot 8 to press the pencil firmly against the circular holding portion 2 of the holder and clamp the same.
The eraser consists of a piece of rubber 5 cylindrical in form, and is inserted in the portion'4 of the holder, being firmly clamped therein by means of a nut 9, which is screwed on the threaded portion' t of the holder. This threaded portion has a number, as three, of slitsv 10 extending longitudinally from the open end of the holder to points near the end of said threaded portion, allowing the threaded portion to expand and to be compressed. Said A threaded portion terminates at the outer end in a circular groove 14:, separated, of course,
into 'three sections bymeans of the three slits Specification of Letters Patent.
Fig. 2 is an enlarged longitudi-' Patented Dec. 5, 1905.
10, the inner surface of which groove forms blunt shoulder-sections which extend inward and rest upon the surface of the piece of rubber 5. I Therefore by screwing the nut toward said outer end said shoulder-sections are more and morestrongly pressed into the rubber and firmly clamp the same, and when the nut rests directly over said groove the eraser is firmly held in the holder.
tion said shoulder-sections spring outward and the eraser may be removed. TlllS grooved I By screwing the, nut toward the pencil end of the threaded secend of the holder constitutes an important feature of this invention. Heretofore it has been the practice to use the sharp edges of the holder to grip the rubber. By continuing the thread up to the end of the holder I am enabled to obtain a sufficient grip of the rubber even though using the comparatively blunt ridge formed by the inner surface of the groove, and thus to sufficiently grip the.
rubber without cutting the same.
-Between the end of the penciLand the end of the rubber is interposed a coiled spring 11, attached at one end to a plate or disk 12'and at the other end inserted into the rubber.
The plate is retained within the holder by the shoulder 13 thereof. This spring expands and presses out the rubber when permittedto do so by unscrewing the nut 9. Atthe same time the plate or disk 12 being retained within the holder serves to retain any irregularlyshaped eraser within the holder and prevent its entire extrusion therefrom.
The holder can be used over and over again on different pencils and with 'difierent rubbers, and the-construction.is such as to conveniently admit of different kinds of rubber being substituted for different purposes, as desired. 1
i I claim 1. A device of the character described, comprising a holder having a threaded portion adapted to receive the rubber and having a plurality of slits extending inwardly from the rubber-holding end of the holder to a point near the opposite end of the threaded portion, and having a groove at the rubber-holding v.end forming an inwardly-extending shoulder adapted to firmly grasp the rubber without cutting, a nut screwed on said. threaded portion, and means forsecuring the holder to the end of a pencil, substantially as described.
2. A device of the character described,'comprising a holderhaving a threaded portion adapted to receive the rubber and having a clamping a pieceof rubber and having a shoulder, a plate retained within the holder between the shoulder and the end of the pencil and a spring secured. at one end to said plate and at the other end to said rubber, substantially as described.
In witness whereof I have hereunto set my hand in the presence of two subscribing witnesses.
ANNIE F. W. BOWEN. Vitnesses:
FRANCIS M. l/VRIGHT, BESSIE GORFINKEL.