US1595464A - Mechanical pencil - Google Patents

Description

Aug. 1o 192e. 'I

B. B. 'GoLDsMIITH MECHANICAL PENCIL v Filed April 22. 1921 Patented Aug. 10,1926. A

www f STATES PATENI :o1-ece.

BYRON B. comsmrn, or NEW Yonx, N. Y.

MECHANICAL PENCIL.

` ilppiieatnm-inea Apru 22, 1921. sr1a1No.463,711.

siderably reduced. An important feature' ofmy invention which distinguishes it from other constructions, is that a lead tube isrevolved in a case, and projects out of the front of it, and that .portion-,which is within the case has all the attachments on its interior and exterior for feeding a lead, and

Y that portion of the lead tube which projects outof the front of the case is not covered by any shell or holder, but in itself forms a iinger piece to be grasped When'the pencil is operated, as well as holding the lead rigid. In short, I construct 'a pencil with many less parts than usual. Y i

My iinproved pencil is shown in a preferred embodiment in the accompanying f drawings, lwherein Figure 1 is a viewl partly 0 in elevation and partlyv in longitudinal section, Figure 2 is a cross sectional view on the plane 2-2 in Figure 1, Figure. 3 is a perspective view of the nut, Figure 4 is a similar view ofthe rotator shell and Figure '35 isi a side elevation of the lpusher for the The removable pencil lead 10 is accomx modated within a lead tube 11 whose central E bore fits and su ports the lea'd, retaining it vin place by friction in a well known manner.

Thislead tube is made of a solid rod centrally bored, which is threaded on its exterior surface, as shown at 12, and is provided with a longitudinal slot 13, clearly shown in Figure 2. A straight wire 14, fits into the bore of the tube 11, one end resting against'thev rearend'of the lead 10 and its other end being bent lso as to protrude through. the slot 13,' as shown at 15. This 'wire 1s the lead pusher, bywhose immediate agency the lead 1s pressed forward and outward atwill.

In order to operate thepusher 14 forrthispurpose a nut 16v is screwed onto the threads vvof-thetube11, and as it is revolved it` arl- 5 vances alongthe tube, inpinging upon the tions ofthe shell 19 and tube 11,71 prefer to 'make one end of the shell elastic by cutting bent tip 15, so as to press thepusher' 14 and leadl0 forward.

The revolution of the nut 16 may be accomplished in a variety of ways, but I prefer to provide the nut with a depression 17 into which fits the longitudinal depression 18 in a rotator shell 19 which surrounds the p x nut, thus Vengagin -with it inl a manner to permit rotation o the nut by the rotator while allowing the nut to travel longitudie5 nally within the same., Any form of nut and rotator whereby these functions are made possible is within the invention. Also the rotator need not be a separate shell, but provision can be made on the insidelcf the case for engagement with the nut.,V I

The rotator covers the entire path of longitudinal movement of the nut, and in order to preserve the relative longitudinal positwo longitudinal slits 20 through its sides, and to turn in the edges ofthe shell at its outer end, so that theseedges may spring into a cireulargroove 21 in the tube 11. This permits rotation ofy theshell 19 the tube, while preventing relative longitudinal movement. Of course, instead of slitting shell 19, the same object is accom lished if shell '19 ismade of two halves, w ich will eol ' be held together after they are in place, by

a shell into which the two halves fit.

For' the sake of a better appearance and finish, a tapered cover 22- is slipped over the end of the tube 11 and shell 19 so as t'o conceal ,the slitted end of the latter. Also at the inner end .of the shell I prefer to lit a centering cap 23 which prevents the lead tube from rocking within the casing. Finally the outer casing 24 is slipped over the whole interior mechanism making a tight fit on the cover 22 and completing the article.

It is, of course, necessary: that rotary motion should be transmitted from the casing 100 24 to the rotatori'shell 19, and I prefer to accomplish this by vmaking the'cap 23 fit over the shell 19 and into thecasing 24 so tightly that, for all practical purposes, they are united into one structure. Obviously, if de- 105 siredthis end maybe attained by maklng vthe cover 22 fit the shell tightly.

- 0f course, itis understood that it is not necessary lto depend upon 'friction to make 'this tight fit, but that any methodcan be 1 0 liront off tube 19 engages with' .us-ed' ievhich will ineke the cup 23, shell 19 end cese 2t immovehle with respect to each other. -So that broadly considered, vve simnl vlieve e cese und o leed tube, und by revolving one with respect to the other, the pencilv operates. 'lo demonstrate tle simplicity oil the manufacture oit this article, et tention is culled to the following. The leed tube is inode from e piece of tubing9 lilie- Wiee 'the nut. Both con he mede in'lergge quantities on automatic machines. The leed tuhe, nut und pusher een loe readily essen tiled, and these three pieces really torni the importent part ot the pencil lllflien eesefmhled, they are pushed through the rear oli the rotator tube 19 until tle seri gcluinp the oirculor groove 2l on the leed tu"y e? ceja- 3s 22 ond 23 ere now put on und entire meenemism npushed into the cese 24;.

` To'operete the pencil it is only necessary7 to` resp the projecting end ot the tulo-e ll vvit one hund While, with the other 'the casing 2- is rotated. 'lhis rotates the shell 19 which turns the nut 16, causing it to adtrunce along the tube ll., driving the pusher it und leed 10 before it. lit, et eny time,

theleed projects too ter, the nut is retractedloy contrery rotation ot the closing, und the leadvcan be pushed inv/'ord ny pressure units point. s Y

This structure moy'loe modified in e. ve-

riety of ways Without 'departing from the iyeeeeee scope of mv invention, und l do not limit myself to the details herein shown and described.

What l claim isl. A mechanical pencil comprising e threaded leed tube, u cesing revolubly tted thereon -iirom one end of which the lead tuhe projects to permit it to be grasped in operation, a nut on the lead tube for feeding the leed forward end e rotetor shell within the outer casing engaging seid nut in a manner 'to permit relative longitudinal movement oi the nut end shell, end having e portion engaging un annuler groove in the lead tube 2n Apparatus 'as in claim l wherein' the rotator shell hes resilient slitted end Whose with u tapered cover surrounding the lower endet thev rotetor sl'iellD y A mechanical pencil comprising a leed tuloe, un outer casing, e depresslon on the cxterior of the leed tuloe, end en interior shell fixed to the cesingend having a turnedin elastic portion engaging said de ression on the leed tube so as to permit re attive rotation While preventing longitudinal movement ot the casing and leed: tube.

ln testimony whereof l have -hereto set my hand on this 21st dey ot April 1921.

BYRN B. GOLDSMITH.

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