US2179950A - Mechanical pencil - Google Patents

Description

Nov. 14, 1939. `L. J. MOST vMLGHAN'ICAL PENCIL .Filed March 18, 1939 INVENTOR Supa ik Patented Nil-V114, 1939 y :UNITED STATES mrlsi1T" OFFICE ...tllfltf' 222321:.' le,...

10 Claims.

My invention relates to mechanical pencils of the type disclosed in my pending application, Serial Number 208,739, filed May 19th, 1938.

The object of the invention is to provide a simple mechanism, formed of few moving parts,

for propelling, repeliing, expelling and automatically presenting a new lead to writing position.

Another object of the invention is to provide a mechanical pencil in which the lead itself is part of the feed mechanism. .e

' In the appended drawing forming part oi this application,

Figure 1l is an elevation,l partially in section, on line I I, Figure 2.

Figure2 is an enlarged cross-section on line 2 2, Figure 1. l v

Figure 3 is also an enlarged section on line 3 3, Figure-1.

Figure 4 is an enlarged fragmentary cross- V section on line 4 4, Figure 3, showing only the piu-,ts of the lead feeding means.

Figure 5- is a cross-section on line 5 5, Figure 4.

Figure 6 is a similar section on line 6 6, Figl251W@ 4, and

other end. The end of the tip is-truncated to` form a leadv outlet opening I2. In line with the opening I2 and coaxially withv the barrel is a lead guide I3 of angular cross-section, in this particular case, triangular.

ported and secured within the tip by a washer plug I4. 'I'he lower end of the lead guide I3 is preferably flush with the end I2 of the aperture in the tip.

'I'he upper end of said guide has as many prongs I5 as there are sides to the guide. The Width of the prongs I5 is such that they can freely .pass through the die or nut I6 without touching its threads when vpositioned coaxially with 45 said guide I3. In forming the prongs from the body of the lead guide, shoulders I 1 are formed, which constitutes a bearing for the lower end I8 of the die I6. To prevent the die I6 frommoving longitudinally of said guide, the protruding ends I9 of the prongs I5 are bent over the upper end 20 of the die I6 to maintain said die on the shoulders I1.

The die I6 is housed and secured in a tubular -extension 2|, forming part of the hopper 22 of a magazine 23,` which is revolubly. mounted inthe It is properly sup-f (o1. 12o-1s) sleeve24 therein, but will not entrain a lead that l0 I is positlonedin the sleeve 24. The lower end of the magazine is preferably centered by a ring 26 to maintain die in proper alignment with the lead guidel3. l

The ,longitudinal displacement of the magazine l5 in the barrelis preferably prevented by a. ring 21, located between two protruding beads 28, formed'in the lateral surface of the magazine near the protruding portion .25 thereof. This ring 21 has a frictional engagement with the inside of 20 `the barrel sov that it requires an lefl'ort to move' it longitudinally,` but the magazine is free .to revolve relatively to the ring. This is an additional precaution as the magazine is prevented from longitudinal movement by the engagement of 25 l the die I6 between the shoulders I1 on the bent ends I9 of theprongs I5.

A triangular lead 29, entering from the magazine 23 intosleeve 24, will be guided thereby toward the die I6 and the prongs I5, located in 30 the die I6,r will force the triangular lead to present itself so that the lateral sides of the lead 29 will contact with the'sides of the prongs I5, the thread edges of said lead engaging the threads of the die. Since the lead engaged by the prongs 35 can not turn when the die I6 is turned through the magazine, the lead will be forced to move longitudinally, since `the die is prevented'from longitudinal movement by its engagement with the lead guide I3, of which the prongs I5 form 40 an integral part. As long as there is a lead portion located within the die I6, it will be forced shown in Figurer?, the sleeve 24 is part of the -lead guide I3. The sleeve is secured to the pro- 55 truding ends I9' of the prongs Il' and. therefore, the tubular portion 2|' is stationary relative to the magazine.

The die I6' is split so that the same can be positioned between the shoulders I1', formed between the prongs by lead guide I3' and sleeve 24', and the split ring is secured to the tubular extension 24' from the hopper 22'.

In this particular structure, a triangular lead entering the sleeve 24' will be guided more easily into the die in the proper engagement with the prongs, as, under no circumstances, may it be entrained by the rotation of the sleeves. for in this particular case, the sleeve is stationary, relative to the rotating magazine.

I claim:

1. In a mechanical pencil, a barrel having a tip forming a lead outletl a lead guide within the barrel at the outlet, said guide being adapted to prevent a lead from turning therein while vpermitting a lead to move longitudinally of said guide, a threaded die for engaging a lead directly, and associated with the guide to turn relatively thereto but prevented from moving longitudinally of said guide, and means for turning the die operable at the end of the barrel remote from the tip.

2. In a mechanical pencil, a barrel having a tip forming a lead outlet, a lead guide within the barrel at the outlet, said guide being adapted to` prevent a lead from turning therein while permitting a lead to move longitudinally of said guide, a threaded die for engaging the lead directly mounted on said guide to turn relatively thereto and to prevent it from moving longitudinally of said guide, and means for turning the die operable at the end of the barrel remote from the tip.

3. In a mechanical pencil, a barrel having a tip presenting a lead outlet, the lead. magazine revoluble in said barrel, a lead guide at the outlet secured to the barrel, said guide being adapted to prevent a lead from turning therein while permitting a lead to move longitudinally of said guide, a threaded die for engaging a leaddirectly mounted to revolve on said guide, but prevented from moving longitudinally thereof, said die being ,coupled to the magazine to revolve therewith.

4. In a mechanical pencil, a barrel having a tip presenting a lead outlet, a lead magazine revoluble in said barrel, a lead guide at the outlet secured to the barrel, said guide being adapted to prevent a lead from turning therein while permitting said lead to move longitudinally of said guide, a threaded die for engaging a lead directly, prongs extending from the guide through the die so that the die is free to revolve about the prongs, but prevented from moving longitudinally of said prongs, said die being coupled to the magazine to revolve therewith.

5. In a mechanical pencil, a barrel having a tip presenting a lead outlet, a lead magazine revoluble in said barrel, a lead guide at the outlet secured to the barrel, said guide having prongs adapted to engage a lead to prevent it from turning while permitting it to move longitudinally of said prongs, a threaded die revolubly mounted about said prongs, said prongs having means to prevent said die from moving longitudinally thereof, means coupling the magazine to the die to re- ,volve therewith, and means in said coupling means for guiding a lead to the prongs.

6. In a mechanical pencil, a barrel having a tip presenting a lead outlet, a lead magazine revoluble in said barrel, a lead guide at the outlet secured to the barrel, said guide having prongs adapted to engage a lead to prevent it from turning while permitting it to move longitudinally of said prongs. a threaded die revolubly mounted about said prongs, said prongs having means to prevent lsaid die from moving longitudinally thereof, means coupling the magazine to the die Vto revolve therewith, and means for said coupling means for guiding a lead to the prongs, so that the lead in said last means is free both to turn and move longitudinally.

7. In a mechanical pencil, a lead magazine, a lead guide from said magazine permitting a lead to move longitudinally therewith and to turn therein, a second lead guide spaced from the rst lead guide and in alignment therewith, said second lead guide being adapted to prevent a lead from turning therein, but permitting it to move longitudinally thereof, a threaded die revolubly mounted on said second lead guide, but prevented from moving longitudinally of said second lead guide, and means coupling the die to th'e magazine. v

8. In a mechanical pencil, a barrel having a tip forming a lead outlet, a lead guide within the barrel at the outlet, said guide being adapted to prevent a lead from turning therein while permitting a lead to move longitudinally of `said guide, a threaded die for engaging a lead directly revolubly mounted about one end of said gfuide, and means for turning the die from an end of the barrel.

9. In a mechanical pencil, a barrel having a tip forming a lead outlet, a lead guide Within the barrel at the outlet, said guide being adapted to prevent a lead from turning therein while permitting it to lmove longitudinally of said guide, a threaded die for engaging a lead directly revolubly mounted about a portion of said guide, but prevented from moving longitudinally of said guide, and means for turning the die from an end of the barrel.

l0. In a mechanical pencil, a barrel having a tip presenting a lead outlet, a lead guide at the outlet, said guide being adapted to prevent a lead from turning therein while permitting said lead to move longitudinally of said guide, a threaded die for engaging a lead directly, prongs extending from the guide through the die, and means for turning the die relative to the prongs and preventing it from moving longitudinally thereof.

LUCIFER J. MOST.

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