US922093A - Spring-protector for india-rubber pencil-tips. - Google Patents

Description

S. H. CROCKER.

SPRING PROTECTOR FOR INDIA RUBBER PENCIL TIPS.

APPLICATION FILED AUG. 3, 190a.

922,093. Patented May 18, 1909..

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Qaw m E7 W MZQ UNI ED hi ATEE PATENT SAMUEL HY. OROCKER, OF LONDON, ENGLAND, ASSIGNOR TO EAGLE PENCIL COMPANY, OF NEW YORK, N. Y.

SPRING-PROTECTOR FOR INDIA-RUBBER PENCIL-TIPS.

Specification of Letters Patent.

Patented May 18, 1909.

To all whom it may concern:

Be it known that I, SAMUEL HENRY OROOKER, a subject of the King of Great Britain and Ireland, residing at 9 St. James Walk, in the county of London, England, have invented certain new and useful Improvements in Spring-Protectors for India- Rubber Pencil-Tips, of which the following is a specification.

This invention relates to a spring protector for indiarubber pencil tips constructed in such a manner that the tip can be readily exposed for erasing purposes without special manipulation and is at once covered on stopping the erasing operation.

The ordinary pencil protector, provided as usual with an erasing t1p, is slotted at each side to permit the bent end of a spiral spring to project slightly through, the other end resting against an internal rib. On the pencil protector is slid the tip protector or sheath, having a channel into which snaps the extremities of the bent end of the spring, securing the sheath in place but permitting it to be pressed back to expose the erasing tip. Immediately the erasing operation is over the sheath springs back to inclose the tip and protect it from dirt.

In order that my invention may be more readily understood, reference is had to the accompanying sheet of drawings in which Figure 1 is a longitudinal section of the de vice and Fig. 2 a cross section.

The pencil protector A is formed with the annular channel a which prevents the end of the pencil being forced too far in and also forms a seat for the internal spiral spring B.

The upper end of the spring is bent at b to form a cross piece projecting slightly at each side and passing through the slots a in the protector A. On the outside or" A is slid the tip-protector or sheath 0 having an annular internal groove or channel 0. Ihe extremities of the cross piece or doubled end 6 of spring B extend through the slots of the pro tector into the channel, and thus engage the sheath. By this construction it is feasible to finish each partthe protector A with its contained spring and tip, and the sheath C separately, and then to fit them together by pressing the sheath onto the protector. It will also be noted that the sheath may be rotated freely on the protector A, this obviating any danger of distorting the parts which might otherwise occur on accidental twisting of the sheath. The groove 0 is preferably of triangular cross section, as shown, with a flat upper side to -iform a stop for the extremities of the cross piece I). The lower side is sloping, thus facilitating the fitting oi the sheath upon the protector, as well as enabling the sheath to be removed, as hereinafter explained, from the protector.

To secure the parts together the spring is first inserted and the ends of the cross piece I) may be nipped together by the fingers if nec essary for the insertion of the spring into the end of the protector A. The sheath 0 is then pressed on and forces in the projecting ends of 1) until the channel 0 is reached when the ends spring out and engage the sheath. The latter can be removed by simply pulling with a certain amount of force and may thus be applied to a succession of pencil protectors.

In using the india-rubber tip for erasing purposes the sheath may be held back by the finger and thumb of the user or if the pencil is held nearly vertical the pressure on the paper forces back the sheath and the erasing may be performed without attention to the sheath, which, immediately pressure is re leased, springs back into protecting position.

What I claim as my invention and desire to secure by Letters Patent is 1. In means for protecting the rubber tips of pencil protectors, a longitudinally slotted roteetor, a sliding sheath formed with an. internal annular groove, and a spring within the protector having a bent end or cross piece which extends through the slotted protector into the internal annular groove in the sheath.

2. In means for protecting the rubber tips of pencil protectors, a doubly slotted protector, an internal spring having a bent end projecting through both slots and a sliding sheath formed with a triangular channel to receive the projecting spring ends.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

SAML. HY. CHOOKER.

Witnesses:

FRANK W. PATTIsoN, GEORGE E. RAYNER.

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