US1715770A - Pencil - Google Patents

Description

J. P. LYNN PENCIL v .im 4, 1929.

Filed vJune 16, 1927 Patented June 4, 1929.

UNITED STATES PATENT OFFICE.

JOHN I. LYNN, O1?A CHICAGO, ILLINOIS, v.ASSIGNOR TO DUB-OLITE PENCIL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PENCIL.

Application led June 16, 1927. Serial No. 199,238.

This invent-ion relates to a pencil of the type which utiliz-es mechanical means for advancing a lead, as required, into writing position. The present improvements are directed to the construction of a pencil body in which is contained an active lead and also, if desired, other reserve leads, as well as the propelling means therefor.

The pencil body with which this invention is concerned is formed of material which can be moulded to the desired size and shape. For this purpose it is common to employ heat and pressure. The resulting product may be of rather brittle character, or it may. be slightly warped or bent from the true form of the mould in which it was produced. Such deficiencies are diflicult to overcome, and tend greatly to impair 'the usefulness of the pencil.

The present invention is'designed to provide for the production of a body which is suitably reinforced. By the provision of such reinforcement, strength is added to the structure so that it will withstand hard usage without breaking. In addition, the form given to thebody by the mould in which it 1s produced will be accurate and true so as to function perfectly with the associated pro elling mechanism.

Vsth objects and purposes such as have 'ust been outlined, the present invention is argely concerned. For a suggestive embodiment of my invention, reference may be had to the accompanying drawing wherein:

Figure l is a vlew (partly in side elevation and partly in longitu inal section of a pencil body equipped with a propelling mechanism;

Fig. 2 is an enlarged detail in section of the lower end of the pencil body with a portion of the ropelling mechanism, shown most in elevation, applied thereto; and

Fig. 3 is a transverse section taken on line 3-3 of Fig. 1.

The pencil herein illustrated by Wag7 of example comprises a body A having, i desired, at its upper end a ferrule 5, in which is held an eraser 6. Fitted to the lower pencil end is a cone-shaped tip B having a rotatable connection therewith.

The pencil body is shown as provided with anaxial opening 7 having one or more slots therein for the accommodation of a head 8 which is carried on a threaded plunger 9.

At its lower end the passage 7 opens into a-` round chamber 1() of enlarged diameterv wherein is also received a tube 11 extending upwardly from the tip B. rIhe walls of this tube arel frictionally engaged with the body walls surrounding the chamber 10 so as to establish a rotatable connection between the tip and pencil body. Extending axially within the tip is a guide tube 12 wherein is slidingly received an active lead 13. At its f according to this invention, may be formed by the application of pressure and heat to a suitable material which is capable of being moulded to the required shape. It is the purpose of this invention to reinforce such a body, and as a suggestive means for this purpose I have shown a wire 14 inthe form of a continuous` spiral which is extendedK lengthwise of the pencil body for a desired portion of its length. This wire is embedded within the material forming the body so as to lie interiorly thereof. Where the body walls are of reduced thickness to form the enlarged chamber 10 of the lower end thereof, the coils of its wire may be tangential to the walls of this chamber, as shown in Fig. 1, or may be slightly exposed within the chamber, as suggested in Fig. 2. In the latter case, the walls of the tube 11 engage directly with the spiral when the tip isl fit-ted to the pencil' body, thus establishing a metal to metal contact. The use of a wire coil for this reinforcement is desirable, inasmuch as the material forming the body may flow freely therethrough, when being moulded to shape. It is possible, however, to obtain satisfactory results by a reinforcing medium otherwise formed, as, for example, by the use of one or more rings arranged in spaced relation, or by providing one or more bands or sleeves extending lengthwise of the pencil. In any suchconstruction, the necessary reinforcement is provided, the reinforcing mcdium is wholly concealed and, if desired, a small portion ofthe reinforcing means may be exposed within the lower chamber for contact with the upstanding tube of the tip.

I claim: 1. In a pencil, a moulding forming a body 5 in which is an axial opening, and a reinforcement within the body extending longitudinall thereof and exposed in part upon the wal s surrounding said opening whereby to engage with a tip when fitted thereto, sub- 10 st antially as described.

tion of-its length and exposed in part upon 15 the walls surrounding said opening whereby to enga e with a. tip when fitted thereto, substantial y as described.

JOHN P'. LYNN.

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