US1590917A - Mechanical pencil - Google Patents

Description

4 June 29,1926. 1,590,917 y M. c. TAYLOR MECHANICAL PENCIL .Filed Feb,` 14{1921 Patented June 29, 1926.

UNITED STATES PATENT OFFICE.

MILTON C. TAYLOR, or CHICAGO, ILLINOIS, Assieivon To THE wAIrLCoMPANY, oF

CHICAGO, ILLINoIs, A CORPORATION or DELAWARE.

MECHANICAL PENCIL.

l l Application filed February 14, 1921. SeriaiNo. 444,674.

Y My invention relates to improvements in acter comprising a novel means for eXtruding or feeding the Vlead from the end of the pencil, and

Second, to provide a pencil of the character described, which is simple of construction, economical to manufacture and easy to operate.

These and other objects will definitely appear as the descriptionv progresses, reference being had to the accompanying draw-- ings in which Fig. 1 is a longitudinal sectional view' of` my improved pencil, j 1

' Fig. 2 is a perspective view of my pencil with a portion of the barrel broken away, showing the inner or feeding mechanism in its operative position,

Fig. 3 is a disasssembledview of the inner orfeeding mechanism and showing their respective relation to one another,

Fig. 4 is a cross sectional view on the line 4-4 of Fig. 1,

Fig. 5 is a cross sectional view on the line 5-5 of Fig. 1, and

Fig. 6 is a fragmentary view of the inner barrel showing the laterally extending guide fin.

Vith reference to the drawings, 10 indicates the outer casing or barrel being swaged as at 11 and slotted as at 12 to form a split tip. The numeral 13 indicates an inner barrel, extending about one-half the length of the Outer casing or barrel 10, the lower end of said barrel 13 havinga plug 14 fiXedly attached thereto, and the upper end of said barrel frictionally engages the cap 15 and also forms a receptacle for the eraser 1-6 ,the said inner barrel is slightly bent or turned outwardly as at 17 to form a seat for the eraser 16. The outside diameter of the inner barrel 13 is smaller than the inside diameter of the outer casing 10 by twice the thickness of the shell 18, thus causing the inner barrel, when inserted in the outer cas.-

ing to lit snugly within lthat part of the outer barrel or casing 10 which contains the shell 18. The inner barrel 13 is prevented from being pushed down within the outer casingV or barrel 10 beyond the required. length by reason of another inner barrel 19. Said innerl barrel or shell 19 iits snugly and is solderedA to the outside barrel or casing 10said shell 19 being of a greater thickness thantlie shell 18, thus preventing the barrel 13 from being pushed beyond the point of contact ofthe barrel 13 and the shell 19, which is at the point 20. The shell 19, as is best shownin Fig. 6, is slotted its entire length* as lis shown at 31, the said barrel is turned vinwardly' at 32 to form a iin 33, said iin 33 extending beyond the lowerniost pointof the barrel119 and into the swaged portion of the outer casing or barrel 10 as shown at 34 and is cut away so as to fit snugly against the swaged ortion of the barrel, the opposite side 35 orming a straight edge and runs parallel with the barrel 10 above theswagedV portion.V

- Fixedly attached yto the plug l14 is a slotted tubing 21, which extends in a downward direction to the point 'where the barrel is' swaged at 11, said slotted tubing being threaded its entire length. The circular nut 22 isthreaded interiorly and the upper -portionv of said nut. extendsoutwardly forming a shoulder 23, said shoulder being about twice thecircumference as the lower portion of the nut. The shoulder 23 is slotted as at 24, said slot being adapted to engage the fin. The nut 22, as will be seen, screws on toV the slotted tubing 21.

A feed wire 26 is bent slightly upwardly as at 27 and 28 and between these two points the wire is so stamped as to form the two shoulders 29 and 30 on the opposite side of the feed wire. sembled as follows: Y

That portion of the feed wire below the shoulder 30 is iirst inserted into the slotted tubing 21; the nut 22V isthen placed on the feed'wire between the shoulders 29 and 30 and thence is screwed lon to the tubing, the shoulders 29 and 30 riding in the slotted portion of the tubing; causing thefnut to be securely locked between the shoulders 29 and 30. As has been explained before, the slotted The inner mechanism is as# tubing is fiXedly attached to the plug 14, the v plug in turn is attached to the barrel 13 the upper portion of which engages the cap 15. The assembled mechanism is then placed within-the barrel 1Y0 in which is soldered the shell 19in the lower halt ot the barrel and the shell 18 is soldered to the casing 10 at a determined point to which is ultimately Y attached the clip. Upon the insertion of the mechanism the slot 211 in the nut 22 engages -the fin 33 of the shell 19. By a 'turning of ther cap 15, which is rictionally mounted upon the inner barrel 13, in .a clockwise direction, said inner barrel will also revolve in aclockwise directionand the externally threaded slotted tubing 21, being; lixedly at tached to said inner barrel, will be caused to revolve in the saine direction, causing the nut 22 to unscrew in the direction ot the tip; the feed wire 26 beingI .attached to said' nut and having shoulders riding in the slet in the tubing 21., will. also pursue a downwand direction, andthe lead 37 being situated in the tubing 21 vdirectly .below said vfeed wire, will be crced out through the splittip 12.

By reversing the aforementioned opera.- tion, the said feed wire will be withdrawn andthe lead can .be tubing .21.

The numeral 36 indicates a lead container,

. and when a new lea-d is desired, the cap and forced back thrcngh the.

the flange on the clip y38-is inserted` into an orifice in the outer barrel 10 and-seldered to .the shell 18.

While I have illustrated and described the preferred form of construction 'for carrying my invention into effect, this is capable of variation and modilication without departing from the spirit ot Ithe invention. VI, therefore, do not wish to :he limited tothe precise details et construction set forth, but desire Vto .avail :myself oit .such variations .and incdilicaticns as come within thesccpe of the append-ed claims. Y y

Having described my invention, what I `claim yas new and'de-sire Vto secure by Letters ing a lateral projection, ya rotatable lshellV within the casing, an extension on said shell, and provided vwith a slot through which `the projection projects, a nut cooperable with said extension,V Vand an inn-er barrel secured within the casing and cooperable with the nut for holdingit against rotation but allowing` lits llongitudinal movement'lor the propelling ot the propeller.

In witness whereof I have hereunto' subscribed my name. f

HLTON C. TAYLQR.

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