US1825803A - Pencil - Google Patents

Description

Oct. 6, 1931. J. P. LYNN 1,825,803

PENCIL Filed Nov. 8. 1929 Patented @et 9 193.1

JOHN P. LYNN, F CHICAGO, ILLINOIS, ASSIGNOR TO DUR-O-LITE PENCIL COMPANY,

' 0F CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS PENCIL .Application led November 8, 1929. Serial No; 405,678.

This invention relates to a mechanical pencil of the type in which a lead propelling mechanism is actuated by rotation of the pencil tip relative to the pencil body; and more particularly it is concerned with a special construction of the tip per se by which it 1s adapted to contain a reserve supply of leads, by Awhich the leads are coni'ined in place as long as the tip remains assembled with the body of the pencil, and by which a dependable frictional connection is assured between the tip and the pencil body.

A= su gestive embodiment of this invention is set orth in the accompanying drawings @5l wherein;

Figure 1 is a central longitudinal section through the pencil in its entirety;

Figs. 2 and 3 are enlarged transverse sections therethrough on lines 2 and 3, respec- 20 tively;

Fig. 4 is an enlarged perspective view of the sleeve which is joined to the upper end of the pencil tip;

Fig. 5 is an enlarged transverse section therethrough on line 5 of Fig. 4;

Fig. 6 is an enlarged plan view of a modled form of sleeve for the pencil tip; and

Fig. 7 is a fragmentary longitudinal section of the sleeve shown in Fig. 6.

The present pencil comprises a body A in the forni of a barrel having an axial chamber 6 which opens out upon the lower end thereof. Associated with this end of .the pencil is a tip member B which isvfrictionally and rotatably connected with the barrel.

The tip is preferably formed of metal with tapering walls 7 extending from its lower end and straightened out cylindrically, as at 8, in its upper region. Joined to the tip at its upper end is a sleeve 9 whose lower end is enlarged in the form of a depending iiange 10 which fits within the cylindrical portion of the fast in any convenient manner. The tip sleeve at its upper endis inclined inwardly to provide a shoulder 11 supporting a neck 12 having internal threads 14.

Mounted axially within the tip is a tube 15 r confined in place by the proximate tapered do walls at its opposite ends. This tube forms tip to which it is connected a guide for an active lead C which is adapted to be propelled by a plunger 16 having threads which co-act with the threaded neck 14. At the lower end of the plunger is formed an extension 17 of lesser diameter for engaging the lead; the upper end of the plunger is provided with a head 18, preferably lat,.so as to slide non-rotatably within opposite radial slots 19 extending longitudinally along a central bore 20 which communicates with the chamber 6. The upper end of the bore is closed by a wall 21 which serves as a bottom fora second chamber 22 located at the upper end of the pencil. This chamber is adapted to contain a supply of reserve leads D which may b e withdrawn through the upper pencil end upon removal therefrom of a cap E together with an eraser 23 supported within a retainer 24 having a frictional mounting in a ferrule 25 removably connected to the pencil end.

Within the pencil tip is a magazine having for its bottom a plate or plug 26 which extends between the central guide tube and the tapering tip walls. Access to this magazine is afforded through an opening 27 in thev shouldered end of the tip sleeve. 1When the tip is connected to the pencil body, as during normal periods of use, the opening to the magazine is both concealed and closed so that movement of reserve leads F therethrough is prevented.

The frictional connection obtaining between the tip and the barrel should be uniform, and to assure this result, particularly when the present pencil is produced on a quantity basis, I utilize a bushing 28 as a lining within the chamber 6 at the lower end of the barrel. The tip sleeve isfitted within this lining, and preferably is deformed specially so as to co-act therewith in producin a desired degree of friction. In accomplis ing this purpose, the tip sleeve which is made from a slightly resilient material, is deformed in cross-section, as indicated in Fig. 5, as by pressing in its walls at a plurality of places 29, Athereby producing a corresponding out-pressing of the walls at intermediate places 30. rIhe effect of this is to cause the sleeve to assume initially a form and size which will require a slight bending of its Walls when fitted Within the barrel against the lining with which it establishes friction. The connection thus made is one which permits the tip to rotate smoothly relative to the pencil body in order to induce a longitudinal travel of the plunger, and at the same time renders possible an easy disconnection of the tip Whenever necessary for the insertion of a new lead 1n the guide tube.

The same character of connection may be used for oining the sleeve to the cylindrical portion of the tip, it being preferable, however, tliat the deformation of the flange should be such as to ioduce an inseparable frictional connection etween these parts.

In Figs. 6 and 7 I have shown a generally similar construction in which is comprised a sleeve 39 having an enlarged flange portion 40 fitted Within the cylindrical upper end 38 of the tip 37. Near the u per end of the sleeve is an inclined shoul er 41 supporting a neck 42 having internal threads 44. Access to the magazine Within the sleeve is afforded through one or more openings 57 in this shoulder. The sleeve may be shaped somewhat as shown in F ig. 6 With bulges 6l and flat portions 62, in alternation, circumferentiall formed about its depending flange 40, andywith corresponding bulges 63 and flats 64 circumferentiall formed about its upper region. Longitudinal slits 65 are cut through the sleeve, and may extend from the openings 57 near its top down into the dependin angeportion 40. The bulges and slits in t e sleeve provide, as desired, frictional contact with a lining 28 when the tip is fitted to the barrel, and the bulUes in the depending flange of the sleeve Will. produce a tight fittin connection With the tip. It is preferred t at between the sleeve and its depending lian e a connecting inclined shoulder 66 shou d be provided so as to facilitate the removal of short or broken leads which normally would remain in the lower end of the magazine.

I claim:

l. In a pencil comprising a barrel, having at one end an axial opening provided with a shoulder, a removable tip for the pencil including a tapered end and a reduced sleeve portion extending into the axial opening in telescopic engagement with the barrel, the sleeve portion terminatin adjacent the barrel shoulder in an incline shoulder wherein is formed an opening, lead-propelling means including a plunger disposed axially in said sleeve and movable longitudinally therein and removable with said sleeve and tapered tip from the barrel, said sleeve being dimensioned to provide an annular spare lead magazine around the plunger, normally closed by the barrel shoulder the opening in the shouldered end of the sleeve affording access to the Leasos magazine Within the tip only when the latterA is disconnected from the barrel.

2. In a pencil, the combination of a barrel, a tip at the writing end having a tapered portion and a reduced cylindrical portion extending rotatively into said barrel, the upper end of said cylindrical portion being shouldered to form a second reduced cylindrical part which is internally threaded, a threaded feed plunger engaged in said part providing an annular chamber in the cylindrical portion serving as a magazine for spare leads, the shoulder at the upper end of said portion being a ertured for access to the leads and the tip Wit said plunger being slidably removable from the barrel to expose the aperture.

3. In a mechanical pencil, a barrel and a tip, said tip comprising a tapered portion and a sleeve portion fitting rotatively into the end of the barrel, said sleeve portion having at its lower end an enlargement including a flange tightly telescoped with the tapered shell, together with means carried by the tip and barrel for propelling a lead through said tip ulpon relative rotation of the tip and barre 4. In a pencil comprising a barrel, having at one end an axial opening provided with a shoulder a tip therefor at the writin end having a tapered portion within Wliic is a magazine for spare leads, there being an opening into the tip magazine, exposed only when the ti is removed from the barrel, and normally c osed by the shoulder ermitting movement of leads into and out o the magazine in the tip, and a reduced sleeve portion of resilient material rotatively engaged in said barrel, the sleeve walls being circumferentially continuous with a slight deformation from a true cylinder before entry in the barrel requiring the sleeve to be sprung to lit so as to insure frictional resistance to its rotation therein.

5. In a pencil comprisin a barrel, a tip therefor at the Writing end Iiaving a tapered portion together with a reduced sleeve ortion, the latter being rotatively engag in said barrel and both the tapered and sleeve portions being hollow to provide therewithin a magazine for reserve leads which are movable into and out of the magazine through an opening in the sleeve portion, said sleeve being formed of resilient material with a portion thereof initially deformed re uiring a bending thereof when entered into t e barrel whereby to insure frictional resistance to its rotation relative to the barrel.

6. In a pencil comprising a barrel, a tip therefor at the Writing end, said ti having a tapered portion and a reduced portion bul ing circumferentially and having a lon itudgnal slit therein and extending rotative y into the barrel for frictional and removable connection therewith, and an axially disposed guide tube in the tip extending through the reduced portion and forming therewith an annular magazine chamber for leads in the tip, access to the magazine being afforded through an opening in the tip .which is closed when the tip is in connection with the barrel.

7. In a mechanical pencil, a barrel and a tip, the tip comprising a tapered portion and a sleeve portion fitting rotatively into the end of the barrel, the sleeve portion having at its lower end an enlargement including a, flange bulging circumferentially and telescoped with the tapered shell, said flange being connected to the sleeve portion by an inclined shoulder, and means carried by the tip and barrel for propelling a lead through the tip upon relative rotation of the tip and barrel. A

8. In a pencil comprising a barrel, a tip therefor at the writing end, said tip having a tapered portion and a reduced cylindrical portion extending rotatively into said barrel for frictional and removable connection therewith, and an axially disposed guide tube in the tip extending through the reduced portion and forming therewith an annular magazine chamber for leads in said tip, access to said magazine being afforded through an opening in the tip which is closed by an adjacent portion of the barrel when the tip is in connection with the barrel.

9. 4In the combination defined in claim 8, an annular plug disposed about said tube with its periphery engaging the inner conical surface of the tapered tip to form a bottom for the annular magazine.

10. In the combination defined in claim 8, the upper end of said cylindrical portion being shouldered to form a second reduced cylindrical part, and one end of the guide tube extending into engagement with the smaller'end of the tapered tip while th'e opposite end of said tube is engaged by said shoulder.

In testimony whereof, I have hereunto set my hand this 5th day of November, 1929.

, JOHN P. LYNN.

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