US1301341A - Self-feeding pencil. - Google Patents

Description

J. C.'WAHL.

SELF FEEDING PENCIL.

APPLICATION mso JAN. 5. 1918.

Patented Apr. 22, 1919.

rara-nr ortica.

TOIEZN4 C. WAHL, 0F CIBIICAG'rO,v ILLINOIS, ASSIGNOR TO THE WAHL COMPANY, 0F WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE.

SELF-FEEDIENG P ENCIL.

Specification of Letters Patent.

Patenten npr. 2e, raie.

through a tip by a pusher, and the -olo] ectA of my invention is to provide a magazine` for holding all the leads in a pencil of the above described type and also to provide the magazinel with means for automatically feeding a new leadinto position when a new lead is required.

My invention may behest understood by .reference tothe accompanying drawings, of

which Figure 1 is a longitudinal section of my improved pencil; v Fig. 2 is a detail of themagazine; Fig. 3 is a detail of the casing surrounding said magazine;

Figwi is a section along theline ,L1-1ct Fig. l;

" themagazine, and

Fig, 6 is a section along the vline H6 6 of Fig. 5.

Similar numerals of reference refer to lik parts throughout all the gures.

The mechanism of my improved pencilv is contained ina metallic casing 10, which is provided with a thread 11, into which is screwed a corresponding thread on the lower portion 12. The .lower portion 12 terminates in a cone 13, into which is soldered a' tube 111, having a threaded portion 15,' which serves to sup ort the pencil tip 16.- The tip 16 is prefera ly made with small ridges `on its interior, similar to the pencil shown in' the patent to Keeran, No. 1,151,016. These ridges extend into the tip, deining a hole slightly smaller than the outside'diameter' of the leads. The leads are forced through said ridgesby a suitable pusher hereinafter to be described, the ridges cutting grooves' into the leads and thereby preventing them from turning in the tip or falling out ofthe same.

In the upper end ofthe tube-14 is placed a tube 17, which extends through a-plate hereinafter to be described. Fig. 5 is an enlarged view of the top of 18, which is riveted on the bottom of .a shell 19, which is secured to the interior of the casing 12 by solder or other means. .Secured to the plate 18 is a tension spring 20, the other end of which is secured to the tube 17, which in its turn is secured rigidly to a splra'l magazine 211, a section of which is clearly shown in Fig. 6. The spring is given a tension, tending to rotate the spiral' maga-f zine 21 in the direction of the arrow (Fig. 6), the tension of the spring being transmitted to said magazine through the medium of the tube 17.

The'spiral magazine contains a plurality 'of leadsl 22, and inspection of Fig. 6 will render it apparent that if the spiral magazine 21 is given a tension to rotate in the direction of the arrow that a blade23, se cured t'o the interior of the casing 19, will crowd the leads 221 together and the innermost .one of said leads will be located in thef central portion 21 of the magazine 2'1, in which osition it will be concentric with the tube 1 and also with a pusher `25, which is advanced within the casing by means The upper portion 10 of the casing has a threaded sleeve ,26 on its interior, in which which are united in ahead 29 and go on I either side of the crosshead 27. The tines of the fork are united at their 4lower end by a crosspiece 30, in which the plunger x25 is slidably mounted. The fork 28 is frictionally supported by the interior of the threaded sleeve -26 and the head 29 serves to support a thumbpiece 31, by means of which the fork 28, land consequently the crosshead27, is turned.

. I shall now describe the operation of `my Vimproved pencil:

Assuming the magazine 21 to be filled with leads 22, las shown in Fig. 6, the particular lead-22 which is in the tip .16 is advanced the plunger" 25 until itis completelyused-,stille fact of the plunger 25 following the central lead 22as said `plunger is' advanced serving to prevent the next adjacent lead 22 from occupying the central portion 24 of the magazine 21.y When the plungerv 25 is withdrawn from the central portion of -the magazine, the lead 22, which is next to said central portion, is forced into said central portion by reason of the tendency of the magazine 21 to rotate .relative to the shell 19, in which .is mounted the blade 23. A new lead is thereupon forced into the cen tral portion 24 of the magazine 21 by reason ofy the magazine 2,1 being turned by the-tenysion of the spring 20. The plunger 25 is then advanced by means of the thumbpiece 31 and this new lead is fed into the tip 16. This process is continued until but three leads remain in the magazine. The maga-v .,zine 4is then replenished in the following Y21. The plate 33 has in it a slot 35, which is normally out of registrywith the lip 32. When it is desired to refill the magazine, the plate 33is turned until the slot 35 is in registry with the lip 32. New leads are inserted one at a time into said lip and the new lead willsqueeze in between the two leadsadjacent to the -lip (Fig. 6) and thus make a place'for itself in said magazine by rotating the' magazine 21 against the tension of the spring '20. This process is continued until the. magazinefis full, as shown in Fig.

l6. The plate 33 isthen turned so that the 7 slot`35 will not be in 4regisf;e1"*vvith the lip 32 and thevupper portion 10 of the casing ,is he -screwed onto the lower portion 1-2.

plunger 25 is then advanced by means `of the thumbpiece 31 ,and the lead' occupying thecentral .portion 24 of the magazine 21 is fed- Many variationsv'may bemade from the precise structure herein described without 'departing from the spirit of my invention,-

since I claim: V

I. In a mechanical pencil, the combination of a casing, va plurality of leads, a spiral magazine containing said leads, and means to rotate said magazine insaid casing.

2.-.In a Amechanical pencil, the combina-` tionof a casing, a spiral magazine arranged parallel to said casing, and means to rotate 'said magazine relative to said casing.'

3. In a mechanical pencil,l the combination ofja casing, a spiral magazine arranged parallel to said casing, and a springto rotate said magazine relative to sald. casing.

4. In a mechanical pencil, the combination let of a casing, a tip in said casing, and a spiral..

magazine within said casing havinga centrai portion concentric with said tip. f

5. vIn a mechanical pencil, the combination of a casing, a tip, a spiral magazinerotataa plunger, and means to advance said plunger into said central portion.

6. In a mechanical pencil, theloombinationv ofa casing, a spiral magazine rotatably I bly mounted within said: casing and having a central portion concentric with said tip,

mounted within said casing, a tip in said casing, a central portion to s'aidl'magazine concentric with said tip, a plurality of leads in said magazine, and means for feeding said leads into thecentral portions of said magazine.

7. In a mechanical pencil, the combination of acasing, a tip mounted in' said casing, a

magazine rotatably mounted in said casing,

said magazine having a central portion concentric with saidtip, a blade fixed iny said casing, aplurality of leads inserted in said magazine, and a spring tending to rotate said magazine relative to said blades, whereby said leads are fed into the central portion of said magazine.

. In witness whereof I have vhereunto fsnbl' scribed my name.

JOHN o.- WAHL.

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