US1489765A

US1489765A - Pencil

Info

Publication number: US1489765A
Application number: US603771A
Authority: US
Inventors: Jones Parley
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-11-28
Filing date: 1922-11-28
Publication date: 1924-04-08
Anticipated expiration: 1941-04-08

Description

P. JONES Filed Nov, 28,

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" Patented Apr. S, 11224.

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1.,.' Y JONES, 0F WASHINGTON, DISTRICT 0F COLUMBIA.

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Application led November 28, 1922. Serial No. 603,771. j

' with the accompanying drawings, is a speciiication, like characters on the drawings representing like parts.

This invention relates to mechanical encils and one of the objects is to provi e a encil which is especially adapted for use y artisans, such as carpenters.

Other objects and advantages will appear inthe specification when considered inyconnection with the accompanying drawing, illustrating one embodiment of my invention.

ln the drawing, Figure 1 is a longitudinal plan view of a pencil illustrating my invention;

Fig. 2 is a longitudinal sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is another longitudinal sectional view taken on the line 3-3 of Fig. 2;

Fig. 4 is a sectional view taken on the line 4--4 of Fig. 3;

Fig. 5 is a sectional view taken on the line 5-5 of Fig. 3; and

Fig. 6 is a fragmentary perspective view of the casing and the lead tube, a part` being shown in section.

Referringto the illustrated embodiment in the accompanying drawin I have shown a casing 1, preferably ova or elliptical in cross section, which may be formed of seamless metal tubing. The tapered writing end or tip 2 (Figs. 1 and 2) may be made of any metal which is susceptible of case hardening or tempering to prevent undue wear against the edges of implements, suoli as straight edges, ordinarily used by carpenters and other artisans. The tip 2 may be secured to the end of the casing 1 in any suitable manner. Obviously, the end of thefcasing if desired, may be tapered as by swaging or stamping dies to form the tip.

Cut in the fiat sides of the casing intermediate the ends, are a pair of diametrically opposed oblong openings 3, as clearl shown in Figs. 1 and 6, to accommodate a ead advancing nut 4 which may be cylindrical and slightly larger in diameter than the small diameter of the casing to facilitate manipulation (see Fig. 2). The slotsare substanton tially the same length as the small diameter of the casing and are preferably formed by stamping or cutting H-shaped slits in the casing wall, and subsequently bending the tabs or tongues 5, thus formed, transversely of the axis of the casing (Fig. 6). The bent es form spaced partitions 6 which affor upper and lower bearing surfaces for the milled, lead advancing, nut 4. The inwardly projecting ends or edges of the tongues preferably meet on the large diameter of the casing and may be soldered or otherwise secured together, so as to reinforce any weakened portion of the casing adjacent the openings.

Referring to Fig. 6, the partitions 6 have small, oblong, axially aligned openings or notches 7 preferably cut in thejtongues 5 during the stamping or slitting operation.

The upper opening is adapted to receive and form a guide for a flat pusher rod 8 (Figs. 2 and 5) having square threads 9, preferably formed by stamping dies, to coact with similar threads in the advancing nut 4. The opening in the lower partition is slightly larger than that in the upper one and is designed to receive the upper end of a rectangular metallic lead tube 10 which has its lower end secured in the tip 2 of the casing (Figs. 2, 3 and 7). lead tube may conveniently be secured in the casing by soldering or brazing its upper end to the lower partition 6 (Figs. 3 and 6).

The 95.v

As shown in Fig. 6 the lead tube 10 has 90 a lead retaining spring 11 which is formed by stamping out or cutting a U-shaped slit in one side and bending the tongue thus formed to bear against the lead 12 and hold it in adjusted positions, thus preventing it from droppin out of the tube when the pencil is held 1n upright position. The tip 2 may have a small recess or channel adjacent the spring to permit the spring to fiex.

Referring to Figs. 2 and 3, I have fric- 100 tionally mounted 1n the upper end of the casing a lead magazine 13, to carry extra leads 14, said magazine being provided with asuitable cap 15 which is slidably mounted tube and also to form an abutment or stop 110 on the open end of the casing. The lower for the upper end of the pusher rod to prevent it from being threaded through the nut.

The leads 12 are shown as flat or rectangular in section and are adapted to tit snugly in the lead tube, so that they will not rattle. They are preferably of sutlcient hardness to withstand hard usage without breaking. It will be seen that either a thin or wide line may be made, depending upon the position in which the pencil is held when in use. However, due to the elliptical shape of the casing, the pencil will naturally assume the proper position, between the fingers of the writing hand, for making thin lines.

In the practical operation of my pencil, after a lead is inserted, the user will advance the lead by rotating the nut at on the pusher rod 9 which is held against rotation )y the lead tube. From time to time, as the lead is worn away, the userniay advance it by simply manipulating the nut with the thumb of the dexter hand, without grasping the casing with the other hand, thus leaving the other hand free for holding the work or for other purposes.

My pencil is particularly adapted for use by carpenters and workmen, since it may easily be manipulated and, further, because it may be made longer than the depth of the small pencil pockets, usually provided in carpenters overalls, so that it is always easily accessible and provides for a lead of irregular cross section. Further, the casing and the leads are made of the de.- sired shapes so that no loss of time is entailed by sharpening.

All of the parts of my pencil, except the lead advancing nut 4 and tip 2, may be' made by stamping and cutting dies, thus economizing in manufacture and producing a light and strong device.

My invention, obviously, is not restricted to the particular embodiment shown and described.

Having thus particular] described one illustrative embodiment o my invention, what I claim and desire to secure by Letters Patent is:

1. In a mechanical pencil, the combination of a tubular casing of oval cross section. a lead tube secured within the casing, said tube being oblong in cross Section, a flat threaded pusher rod in the casing projecting into the lead tube and a nut of larger diameter than the small diameter of the casing projecting through the opposed flat sides thereof intermediate the ends of the casing for advancing and` retracting said pusher rod. Y

2. In amechanical pencil, the combination of an oval casing having opposed openings intermediate the ends and in the flat sides thereof, a partition in the casing above Lacasse .said openings having an axial guide opening therein, a lead tube of substantially oblong cross section secured in the casing below said openings, a flat threaded pusher rod for advancing 'a lead in the tube adapted for sliding movement in the guide opening, a rod advancing nut on the pusher rod projecting through said openings beyond the periphery of the casing and adapted for manipulation by the thumb of the dexter hand. said pusher rod .being held against rotation by the lead tube, and means in the tube for holding the lead in adjusted positions.

3. A mechanical pencil, containing in combination, an oval metal casing having opposed oblong openings in the fiat sides thereof intermediate its ends, a tlat lead tube secured in the casing below said openings, a lea-d advancing p-usher rod, a lead advancing nut of larger diameter than the small diameter of the easing threaded on said pusher rod and projecting through said openings, and means for reinforcing the casing above and below said openings comprismg opposed inwardly bent portions integral with the casing, said means also forming abutments for said advancing nut.

4. In a mechanical pencil, the combination of a relatively flat tubular metal casing having diametrically opposed substantially oblong openings in the flat sides intermediate its ends, transverse partitions in the casing at the upper and lower ends of said openings, said partitions comprising opposed inwardly bent tongues arranged in abutting relation having axially aligned openings therein7 a lead tube in the casing,

a lead advancing rod extending through the openings in said partitions and means between Said partitions accessible through said opnings for advancing and retract-ing said 5. In a carpenters pencil, the combination of an oval tubular casing, a flat lead tube secured within the casing a threaded pusher rod slidably mounted in the' tube and held against rotation therein, opposed openings in the flat sides of said casing, and a cylindrical nut on said pusher rod above the tube, said nut being larger in diameter than the smallest diameter of the oval and projecting through said opposed openings.

6. A pencil comprising` in combination,

a tubular casing` substantially elliptical in .section and having opposed oblong openings on the. minor axis thereof. transverse partitions in the casing at the upper and lower ends ot' the openings, said artitions having rectangular openings axial y of the casing, alead tube rectangular in cross section, secured in the opening in the lower partition and at the lower end of the casing, a. flat lead propelling rod in the lead tube having square threads formed on its opposite edges, and a cylindrical rod profpelling nut in the casing between the paru titions extending throng the openings.

f?. In a mechanical pencil, the combination of a tubular casing elliptical in section,

having opposed oblong openings formed in the dat sides thereof, partitions at the upper and lower ends of said openings comprising opposed inturned tabs secured to- 10 get-her at their inner edges to'strengthen the casing adjacent said openings, said partitions having w axially aligned openings therein, a dat lead tube secured to the lower one of said partitions and to the lower end W of the casing, a screw threaded lead advancing rod in the tube and extending through both of said partitions andk a mi propel-ling' nut between said partitions.

8. ln a mechanical pencil, the combina- 2@ tion of a dat metal casing, a dat :.H- tu lstantiallv cylindrical nut for advancing and retracting said pusher rod, said nut pro jecting through openings in the flat sides in-` termediate the ends of the casing and being smaller in diameter than the major diameter of the casing.

9. A mechanical pencil comprising, in combination, a tubular casing of elliptical cross section and a lead advancing nut for projecting a lead therefrom, said nut proB1 jecting beyond the periphery, of the casin through the flat sides intermediate the en and being operable by the thumb of the user while the pencil is in gripped marking posi tion.

In testimony whereof, I have :K1 l my name to this specification.

PARLEY JNES.