US1493178A - Mechanical pencil - Google Patents

Description

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May 6 1924. T. E. WRIGHT MECHANICAL PENCIL y r ,1 A Wm.. 1

Patented May '6, 1924.

THOMAS'E. WRIGHT, OF BROOKLYN, NEW YORK.

MECHANICAL rauen..

Application -mea may 17, 1922. snal ,110. sst-ooe..

To all whom t may cof/wem.'

Be it known that I, THOMAS a citizen of the United States, and a resldent of the borough of Brooklyn in the count of Kings and city and tate of New ork, have invented certain new and useful Improvements in Mechanical Pencils, of which the following is` a. specification.` improvements relate to mechanical My pencils, so called commercially, of the type in which the lead is forcibly projected through the tip thereof in a manner now well known in the art; and are designed to attain simplicityand economy in construction, as well as to facilitate manipulationas hereinafter fully set forth,-the invention consisting substantially in the specific combination and arrangement of 7parte `and appurtenances described and claimed.

In the accompanying drawings vI exemplify a practical embodiment of the essential features of my improvements in a encil of the class designated, although do not limit myself to the identical form and construction of component parts shown, since various modifications and equivalent mechanical expediente may be resorted to in details with like result, and vwithout de parting from the spirit and intent of my invention in this respect.

With this understanding,

Fig. 1, represents a central longitudinal v section of a pencil casing, showing the adjunctive and contained and in operative co-relation:

Fig. 2, is a. sectional elevation showin the operative parts withdrawn in paru om the casing: l

Fig. 3, is a perspective view of the actuating screw, head, and nut:

Fig. 4, 'is a central longitudinal section of the tubular screw, head and lead magazine:

Fig. 5, is a .sectional elevation of the lower or tip end ofthe pencil, showing a lead in position for use and advancement:

(liig. 6, is a persptive view of the push ro Fig.k 7 vis a transverse section taken upon Fig. 9, is'a transverse section4l taken upon plane of line 9-9 Fig.,1:

E, WRIGHT,

parts' in elevation:

Fig. 10, is an end elevation of the actuatingscrew nut: 1g.' 11, is a transverse section like Fig. 8, and taken on lane of line 8 8, Fig. 1, showing a modi cationfin the form of shell orcasmg;

Fig. 12, is a transverse Isection like unto Fig. 9, and taken on the` same plane 9-9 Fig. 1, of -the .modification shown in Fig. 11. K

The outer shell for casing C, of tubular construction, is formed with a truncated conoidal end portion c, into the extremity of lwhich .the .tip t, is screwed, the y'axial channel in said ti. t affording a close fit fior. the portion of t e lead Z, accommodatedl therein, so that the saidflead Z will be held normally against displacement by 'fric-.tional contact or, technically, by a forced itwhich will vnot however prevent the advance of the lead under screw pressure as' hereinafter set forth.

u The main portion of the tubular casing C,

beyond the truncated conoida-l end c, there- 1 of, may be Y'circular in cross section, (or substantially so) as lshown in Figs. 11 and 12, or it mayy be of any polygonal form, or even trian lar, in cross section, being so constructe as to prevent the rotation of the travelli nut N, which acts as' the mount and ve icle for the lead feed plunger P, as subsequently explainedthe 4peripheral surfaces ofsaid non-rotative travelllng nut N, being of course correspondingly formed for contactual engagementl with the inner surfaces of said' casing C whatever the form thereof in cross section.

Thus in lall but Figs. 11 and 12 of the drawings the use, by wg o f exempliication, of an hexagonal nut is illustrated, the tubular casing C, being correspondingly hexagonal in internal cross section,`where N, essentially cylindrical, or of circular peripheral configuration, -isillustrated', in'

which case the nut N is formed on one or more peripheral sides with a longitudinal groove n', and the -body of the casing C1, is correspondingl formed with one or more longitudinal. ri c', as indicated more particularly in Fig. 12, of the drawings.

The non-rotative vtravellin nut and plunger carrier N,` is formed or en agement with the male screw thread S, whic is pref- J, erabl reversible, so as to function when positioned in either direction, 'llhat is to say,-

`each extremity of said nut-actuating screw S, is formed with ak tapered nipple s, having a relatively tine peripheral screw thread as compared with the relatively coarse vthread of the "main or medial portionof said actuating screw S. .By this duplication of nipple construction either endy of the actuating screw S is ,adapted for engagement with the correspondingly screw-tapped (7') inner end of the rotor tube R, which latter also incidentally, functions as a holder for replace-I ment leads Z. This duplexv nipple end con-A figuration 8, s, of the actuating screw S, is shown more particularly inlig. 2 of the drawings.

The rotor tube R, is held in position normally on the outer end of .the casing C, by means of an inturned snap 'shoulder or boss 0*, as shown more particularly in Figs. 1 and I' 7 of the drawings, said snap bosse", engagcover for the lead' 4a A `rically ingwith the sides 'of an annular groove 1", on the peripheral surfaceof the rotor tube R, and thereby preventing lon i'tudinal movement in either direction of t e rotor R, and' of the actuating screw S attached thereto as aforesaid.

The end section r2, of the rotor 'tube R, protuberant beyond the end of thecasing, constitutes the handle or knob for manipulative purposes, being reerably, although not necessarily, Aof cy 'ndrical form and yknurled peri herally, or otherwise 'formed imate y to,

; of, said slot s2, being for the accommodation of the lead-feed plunger l?. The latter is formed` medially with shoulders 72,12, for

, engagement with the opposite-sides of the non-rotative travelling nut N, which latter is formed with a slot n on one side thereof to admitg'of its straddling said lead-feed plunger P.. Both ends p', p', of the plunger P, are 'ot the sainel length and configuration,

andv hence, like the actuatin screw itself, the plunger is reversible, an will. function in either direction, its ocebeing to trans'-V init the motion and, ower derived from the actuating screw S t rough the medium of the nen-rotative travellin nut N, en which it is mounted, tc the lead positienedin the tip t, and in the herev e ci the nipple s, in-

inearre volved, as indicated more particularly in Fig. 5 of the drawings. Y

rlhe non-rotative nut N, is, on one side, formed with a concave Hare n?, to admit of its insertion or withdrawal, past the sna boss c", of the tubular casing C, and this concave flare .01.2, is preferably coincident ywith, and constitutes the entrance to, the

slot n', formedl tor the reception of the shank v or medial portion of the type feed plunger/ P. rlhis construction of nut N, will be u nderstood by reference more particularly toI Fig. 10, of the drawings.

`It is obvious ,from the foregoing that, with the parts assembled and in the relative positions shown for instance, i-n Fig. 1, the turning of the rotor R in eitherdirec'tion'wll cause the actuating screw S, to advance lor retract. the non-rotative lnut N, and with it the lead-feed plunger P. Thus the pressure on the inner end of the lead Z, in the tip t, may be relaxed, as when itis desired to force the outer end -of said lead backward into sired to force the end of said lead l, outward be ond the tip t, to compensate for wear etc.

en it is desirable to elect replacement of a lead Z, a sharp pull on the rotor R will release it fromthe snap boss c* of the casing C, and permit of the withdrawal there? from, bodily, of the actuating screw S, nonsaidtip t, or augmented, as `when it isvv derotative nut N, and plunger P,-`the saidy snap boss c", affording the onlyresistance to v be overcome in this lrespect.

When the operative parts are then withdrawn from tliecasing C, the rotor R, may

be. unscrewed from the nipple s of theactu-l .atmg/ screw S, to which it was attached, and

a fresh lead l, may be withdrawn from the reservoir?I through the tap hole.

This being accom lished, the rotor isv los.

again screwed ontojt e actuating screw S,

but to the opposite nipple s, thereof,-or in other, words the actuating screw S, is inverted or reversed, so as to bring thev non-rotative nut N and plunger P into operative position for 'immediate use after the opera-l tivev parts are again inserted in the casing C, thus obviating the necessity for rotating the nut N on the actuatin screwS,-back to the starting point so as to ring the feed plunger P into position for action on the re lacement lead Z; The latter is inserted in t e bore s',

` ofthe reversed or tip end nipple of the `actuating screw S, it being understood, of course, that both ends of the said screw S are alike in structure and that the nipples s, a, are duplicates. f

Thus repared for renewal of service, t e operative parts are orcib reinserted in the tubular casin C, untill the snap Mss again engages 'with the annular, groovel r', in the periphery of the rotor R, when the device again is ready for iininediate use.' f

encil connection, is the fact that there is abso- An important feature to belno'ted in this lutely no unscrewing of parts involved in either the withdrawal orreinstatement of the operative parts as related to thecontainer or casing C, a simple vpull or push,

exertedinl alignment withtthe central longitudinal axisof said parts as assembled being v amply suiiicient to overcome the resistance prior state of the art is, cheapness .combined simple bot'lrin construction an l to be subjected. There are no com licated.

with durability, the operative arts being o eration, and well calculated to withstand 't e rough usagel to which such implements are liable mechanical expedients involved, and internal stress and wear is ypractically eliminated.

What I claim as my invention and desire to secure by Letters Patent is, l

1. A mechanical pencil of the character designated comprisln a tubular casing formed with a lead ho ding tip, a lead-feed plunger, formed with lateral shoulders for engagement with a travelling nut, said travelling nut on which said lunger is mounted,

means for rendering said nut-non-rotative within the casing, a -longitudinally slotted actuating screw engaging said non-rotative nut, and. extraneous means for turning said actuating screw on its axis in 'either direction, substantially in vthe manner and for the purpose described.

2. A mechanical pencil ,of the character designated, comprising a tubular casing internally polygonal in cross section and formed with a lead holdin tip, a reversible lead-feed plunger, a travel in nut on which said plun er is mounted, sai nutl conforming perip erally tion of the caslng, a longitudinall slotted actuating screw engaging with. sai non-rotative nut and extraneous means for turning said actuating screw on its axis in either direction, substantially in the manner and for the purpose described.

3. A mechanical' pencil of theC character designated, comprising a tubular casing internally hexagonal in cross section and formed with a lead holdin tip, a reversible lead-feed plunger, a travel in nut on which saidplun er is mounted, sai nut conforming perip erally to the internal hexagonalcross section of the casing, a longitudinallyl and the feed plunger P, is

` designated, comprism to the internal crossv secdesignated, ,comprlsin -slotted actuating screw engaging with said non-rotative nut, and extraneous means for turningsaid actuating screw on its axis vin either direction, substantially inthe manner and for the purpose set forth.

4. A mechanical pencil of-` the character designated, comprising a tubular casing formed with a'lead-holdin tip, a reversible lead-feed plunger, a travel ing nut on which said reversible plunger is mounted, means for rendering'said nut non-rotative within the casing, a longitudinallyl slotted reversible J' actuating screw engaging said non-rotative nut, and extraneous means for turning said actuating screw on its axis in either direction, substantlally in the manner and for the purpose described.

`5. A mechanical pencil of the character designated, comprising a tubular casing formed with a lead holding tip, a reversible lead-feed plunger, a travelling nut on which said plunger is mounted, means for rendering said nut non-rotatable within the casing, a ongitudinally slotted actuating screw 4ensaid non-rotatable nut, a rotor atga 'n` .tacie to said actuating screw and protruding beyond the casing, and means for retainin said rotor in position against longitudina movement in either direction while permittin ofthe turnin thereof on its lon 'itudina axis in either irection, substantia 1y in the manner and for the purposedescribed. -v

encil of the character a tubular' casing formed with a lead ho din tip, a reversible lead-feed plunger, a trave ing nut onwhich 6. A mechanical said plunger is mounted, means for renderf ing said nut non-rotatable within the casing,- a ongitudinally slotted actuating vscrew enga 'n said non-rotatable nut, a rotor attac e to said actuating screw and protruding beyond the casing, and means for' retaining saidy rotor in position against lon itudina movement in either direction lwhi e permittin of the turning thereof on its longitudina axisineither direction, said means comprising a peripheral annular slot on said rotor, and an engaging snap boss on the casing, for the purpose, and substantially in the manner described.

7. A mechanicalpencil of the character a tubular casing formed with a lead ho ding tip, a reversible lead-feed plunger, a travelling nut on which said plunger is mounted, means for renderin said nut non-rotatable within the casing, a ongitudinally slotted actuating screw enga 'n said non-rotatable nut, a rotor attac e to said actuating screw and protrud- ,ing beyond the casing, and means for retainof' the turning thereof on its lon tudina axis .in either direction, said rotor 'lll las

movement in either direction whi e peringl formed with a lead-replacement comartment having a detachable closure thereor substantially in the manner and for the purpose described.

8. A mechanical a tubular casing formed with a lead ho ding tip, a reversible lead-feed plunger, a travelling nut on which said plunger is mounted, means for rendering said nut non-rotatable Within the casi-ng,

10 a longitudinally slotted actuating screw enl gaging said non-rotatable nut, a rotor at- \tached to said actuating screw and protrud.` fing beyond the casing, and meansfor retaini encil of the charactei 5 designated comprism mesme ing said rotor in position against lon itudinal movement .1n either directlon whi e per- -mitting of the turning thereof on its longitudinal axis Iin either direction, said rotor bemg formed with a lead-replacement compartment having a detachable closure consisting of a'rubber eraser, for the purpose 20 and substantially in the manner lset forth. l

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