US2049810A

US2049810A - Pencil lengthener and holder

Info

Publication number: US2049810A
Application number: US692598A
Authority: US
Inventors: James P Kusa
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-10-07
Filing date: 1933-10-07
Publication date: 1936-08-04
Anticipated expiration: 1953-08-04

Description

Aug. 4, 1936. J. P. KUSA.

PENCIL LENGTHENER AND HOLDER Filed Oct. '7, 1953 2 Sheets-Sheet l l/vvs/vroe: JAMES R. KusA Qjmj 2) A TTOP Y.

Aug. 4, 1936. J. P. KUSA PENCIL LENGTHENER AND HOLDER- 2 Shets-Sheet 2 Filed Oct. 7; 1933 lNvsA/roe: JAMES P. KUSA Arm/2N5! Patented Au 4, i936 UNITED STATES PATENT OFFICE 2,049,810 maven. LENG AND noLnEa James Blues, Cleveland, Ohio Application October r, 1933. Serial No. 692,598

.flsom'ms. (elmo) This invention relates to pencil lengtheners and holders for holding short pieces of pencils inorde'r to provide a greater length 'of grip and greater ease of manipulation and also to provide an en- 5 largedand more suitable grip for longer pencils.

As is well known, when a pencil is worn down to a relatively short length it ceases to be convenient for'use and it is necessary that the short piece or m stub oi the pencil be mounted in a lengthener so as to provide agrip of suitable length. It also frequently happens that, after a pencil has been somewhat shortened by use, the writer desires to mount the pencil in a holder in order toprovide 15 an enlarged or more suitable grip. In many cases,

also, the writer or draftsman has a series of holders having easily perceptible differences of form,

color or inscriptions which he uses selectively to hold pencils of difierent degrees of hardness, which are otherwise only distinguishable by close g examination of the lettering on the sheath of the pencil.

I am aware that lengtheners have been 'proobjectionable inward movement of the pencil caused by ordinary pressure in writing, and the 35 gripping of the pencil is not sufllclently firm to prevent the rotary. movement of the pencil when sharpened in a mechanical sharpening device.

One object of this invention, therefore; is to produce an improved pencil holder which will 40 more firmly grip and more rigidly hold the pencil than is possible with previously known holders.

A further object of this invention is to produce a pencil holder which is adapted to' hold various 45 tion or. pencil and holder to be of objectionable length. v

A further object of this invention is to produce a pencil lengthener and holder which positively 50 grips the pencil andfrom which the pencil may be axially extended as the pencil is used, thus maintaining a substantially constant overall length ofpencil and holder.

A further object of this. invention is to produce 55 a pencil holder in which the pencil may be mountlengths of pencils, without causing the combinaed very quickly with a slight rotary movement and with a minimum of effort. A further object of this invention is to produce a pencil lengthener in which a pencil or stub of the usual standard polygonal cross sectional shape may be inserted in the holder to any desired extent and may begripped in that position in the holder by a slight rotary motion.

. Afurther object of this invention is to produce a pencil lengthener of this type in which the penoil will not shift or twist when it is being sharp wed in a mechanical pencil sharpener. A further object of this invention is to produce a pencil holder and'lengthener artistic in appearance, simple and economical in construction, and eflicient and certain in operation.

For the accomplishment of the above and other objects, this invention comprises a pencil holder consisting'of a tube with-a generally cylindrical bore having an interior dimension adapted to slidably but snugly receive a wood sheathed pencil of polygonal cross section, the tube being formed with one or more transverse inwardly directed indentations or projections which will not prevent the insertion of the pencil into the tube but which .25

are adapted, when the pencil is rotated, to impress themselves in the apex lines or ridges of the pencil whereby the pencil is prevented from moving axially relatively to the tube.

A further feature of this invention is the provision of a stop, preferably formed by one or more longitudinal inwardly directed projections which limit rotary movement of the pencil to a degree which will arrest the rotation of the pencil while the ridges are' in engagement with the transverse indentations.

' A more specific additional feature of this invention is the provision of resilience and frictional resistance in association with the transverse inwardly directed projections whereby a tendency of the pencil to be inadvertently released is prevented.

In the preferred embodiment of this invention the indentations are so shaped and disposed as to leave a polygonal opening having substantially the same shape' and size as the crosssection of the pencilfor which the holder is intendcylindrical tube and to supplement the resilience of the tube and to improve the artistic appearances of this novel holder and to enlarge its utility. I

Further and more specific objects of this invention will become apparent from the following description and claims. This description sets forth in detail certain devioes'embodying this invention, such disclosed devices constituting, however, but a few of the forms in which the principle of this invention may be applied- Referring to the annexed drawings:

Fig. 1 is .a plan view of a preferred form of this improved holder gripping a pencil.

Fig. 2 is a side elevation of the parts shown in Fig. 1, a certain casing element or sheath of the holder being shownpartly in section.

Fig. 3 is a complete axial section of this improved holder, this view being taken in the plane indicated by

line

3, 3 in Fig. 1 and the pencil inserts being shown in elevation- Fig. 4 is a view, partly in elevation and partly in axial section, illustrating a simplified form of this improved holder and showing a pencil gripped in the holder.

Fig. 5 illustrates this invention applied to the pencil arm of an inexpensive form of drafting compass.

Fig. 6 is an enlarged perspective view of the gripping portion of one of the tubular elements comprising a portion of the devices shown in the preceding figures, and disclosing some of the important elements of this invention.

Fig. 7 is a view similar to Fig. 6 showing one of many alternate arrangements of the elements of the gripping'portion of the tubular element comprised in my invention.

Fig. 8 is an enlarged transverse sectional view thru the holder and pencil at a point spaced fromthe gripping portion, this view being taken on the plane indicated by line I, 8 of Figures 2 and 3.

Fig. 9 is an enlarged transverse section thru the holder and pencil taken on the plane indicated by line I4, I in Figures 2 and 3, this view, however, showing the pencil in slidable relation to the holder, this being the position in which the pencil is inserted in the holder.

Fig. 10 is a view similar to Fig. 9 but taken on the plane indicated by line I5, I5 in Figures 2 and 3, this view alsoshowing the pencil in that angular position in the holder inwhich it is inserted into the holder and is slidable therein.

Fig. 11 is an. axial section thru the holder, this view being taken on the plane by line I I, II in Fig. 12 is a view similar to Fig. 9 but showing the pencil rotated about 30 degrees clockwise from 'its insertion position, as viewed in the drawings.

Fig. 13 is a view similar to Fig. 10 but also showing the pencil rotated about 30 degrees clockwise from its insertion position.

Fig. 14 is an enlarged view taken in the plane indicated by line I4, I4 in Figures 2 and 3. this view corresponding with Figures. 9 and 12- but showing the pencil securely gripped in the holder, having been rotated about 45 degrees clockwise from-the inserting position shown in Figure 9 as viewed in the drawings.

Fig. 15 is a similarly enlarged view taken on the plane indicated by line I5, I5 in Figures 2 and 3,

this view corresponding with Figures 10 and 13 but showing the pencil rotated about 45 degrees from the insertingposition shown in Fig. 10 and being securely gripped in the holder.

seated in the usual ferrule 'I, on a pencil end 8,

Fig. 16 is an axial section thru the holder, this view being taken on the plane indicated by line I6, It in Fig. 14.

Fig. 1'? is a view similar to Fig. 15 showing, however, a modified form of transverse pencil 5 gripping elements.

In reference to Figures 9 to 16 inclusive, it

should be noted that, in the broader aspects of .the specifications and claimsand I desire not to be limited'in any respect by the use of one term or the other.

Referring first to the form of the invention 20 illustrated in Figures 1,2, and 3, wherein I represents a pencil, mounted in one end of this improved holder by a novel gripping conformation to be hereinafter described. The pencil is formed with a point 2 and a square upper end 3. The pencil I has a polygonal sheath having apex lines or ridges 4 alternating with plane faces 5. As will appear, the lengthener or holder is preferably formed with a continuous opening extending therethrough and both ends are provided 30 with substantially identical gripping conformations. As a result of this provision a pencil may be mounted in both ends of the holder or, as shown in the drawings, an eraser 6 may be mounted in the opposed end, this eraser being 3 such an eraser assembly as might be reclaimed from an otherwise completely used pencil.

The lengthener or holder, in the embodiment illustrated in Figures 1, 2 and 3 consists of an in-- ner substantially tubular member I 0 and an outer sheath or casing 20.

As best shown in Figures 6, and 8, 9, and 10, the tubular member I0 is preferably made of thin gauge metal having a slight resiliency. The member III is generally tubular in cross section and has a tubular bore II of substantially the 7 same inside diameter as the diameter of the circle circumscribed about the ridges of the pencil I, but is provided with a plurality of inwardly extending projections consisting of inwardly forced indentations or teeth formed, in the illustrated embodiment, of metal of the tube. These inwardly projecting teeth are-located preferably near one or both ends of the tube and are adapted to grip the pencil I and/or pencil end 8. These projections are of two types: first, transversely extending projections or teeth I2 and second, longitudinally extending projections or tongues 60 The transverse projections or teeth I2 are relatively narrow in the longitudinal direction while the longitudinal tongues I3 are relatively narrow in the transverse direction but extend a considerable distance longitudinally of the tube.. The 5 transverse teeth I2 are so formed that their bottoms II form chords across the bore of the tube. It will further be noted that the length of these bottom chords is substantially the same as the width of the faces of the pencil I and that, in the embodiment shown, the number of teeth I2 is the same as the number of faces on the pencil and that these teeth are equally spaced around the bore of tube so that the constricted area 'aoeaaio stantially similar in size and shape to the cross section of the pencil. It will be apparent that the projections l2 substantially contact the faces of the pencil as clearly seen in Figure 10. The constricted area at the teeth I2 is of a size to provide a snug sliding fit for the insertion oi the pencil into the tube, when the pencil is properly angularly alined with the constricted area. As

will be evident from an inspection of the draw-' ings, these inwardly extending projections form transverse fins or walls adjacent the periphery These tongues l3 are circumferentially located' substantially at one end of the transverse teeth I I2 and intersect these teeth, as shown at the points l5, and extend on each side of the teeth i2 for a substantial distance, as will appear from an inspection of Figures 2 and 6.- The longitudinal tongues are formed with a relatively abrupt wall It, extending in a nearly radial direction.

' The outer sheath or casing 20 may be made of any suitable material either formed or molded. I

prefer to make the sheath of pyralyn, celluloid, hardrubber or similar plastic compound. The sheath 2!! is mounted on the tube ill by cementing, forcing, or in any otherdesired manner. The

inner opening of this sheath should preferably be of the same shape as the outside of the tubular member ill. The outer contour of the sheath may be polygonal as shown in the drawings, or cylindricai, or of any other desired shape. The outer surface of the sheath may be smooth, or ribbed,

\ fluted or otherwise fashioned. I prefer, however,

to apply various scales to the smooth faces of the exterior of the sheath as shown at 2!, for use of engineers and draftsmen. Other suitable inscriptions such as decimal tables, interest tables, etc., may be imprinted for other professions as will be understood, or these surfaces may be used for advertising purposes.

y In assembling the pencil in the holder it necessary to axially aline the pencil with the tube and to rotate the pencil so as to angularly aline the faces 5 with the bottoms it of the inwardly extending transverse teeth i2. The pencil may then be inserted in the holder and the upper portion thereof moved past the projections until the desired length of the pencil remains outside of the holder. ,The position of the pencil relatively to the inwardly extending projections l2 and i3 in Figures 12, 13 and 16; The scale of the draw-' ings being very substantially. enlarged in Figures 9 to 16 inclusive, it-will be understood that the inwardly projecting teeth are relatively narrow and practically constitute knife edges andjor this reason the resistance to the rotation of the pencil caused by the teeth I2 is not excessive.

It will also be apparent from Figures 12 and 13 that the pencil is now positively locked against axial movement relatively to the holder, due to the interlocking of the teeth i2 in the recesses- 9. It will be understood that the passing of the ridges of the pencil in engagement with the bottoms of the teeth I! will cause a slight outward distention of the tube as shown at II in Figures 12 and 13.

The continued rotation of the pencil in'a clockwise direction brings'portions of the pencil adjacent the ridges in engagement with the longitudinally extending inwardly projecting tongues l3 which eflectively serve as stops ,or abutments to prevent or'arrest the further 'rotation of the pencil in the clockwise direction. It will be apparent that this additional rotation from the position shown in Figures 12 and 13 to the arrested. position of the pencil shown in Figures 15 and 16 does not cause the release of the recesses 9 from the transverse teeth l2.v When the pencil reaches the arrested position, the outward distention i1 retracts due to the passage of the high points or ridges of the pencils beyond the innermost point of the bottoms it of the teeth It. It will also be understood that the resilience and the resistance of the tube to distend will efiective ly prevent-the inadvertent counterclockwise rotation of the pencil in use and the consequent undesired release of the pencil. It will also' be apparent that the resilience of the wood will cause 25 I It will be apparent that the gripping engagement of the holder on the pencil is such as topositively prevent axial movement of thepencil in the holder during all reasonable uses of the pencil and also that the gripping engagement will positively prevent the rotation of the pencil in one direction and will prevent the rotation of the-pencil in the other direction by a substantial frictional and elastic resistance. It will also be apparent that this pencil will not become shifted or rotated when sharpened on a mechanical sharpener as the usual right hand rotational effeet will only serve to more tightly abut the ridges 4 against the longitudinal tongues id.

The snug fit of the pencil in the here it of the tubular member holder in which the ridges of the pencil practically contact the bore of the tube on all sides, as clearly shown in Fig. 8, result in providing a very firm engagement of the pencil in the holder which is free from the looseness and flexure which is frequently found in holders.

The eraser 6 being provided with' a pencil end extension 8 is mounted in the holder in the same manner as explained above for the pencil except i that, for the sake of conforming to usual custom,

the arrangement of inwardly projecting teeth and longitudinal tongues is. made opposite hand from that shown at the right end of the holder in Figures 1 to 3 in order that the eraser may be locked in the holder by the usual right hand rotation.

A great many types of holders may be provided including this invention and I illustrate in Fig. 4 only one such modification. In this modification, 30 indicates a tubular member in which is mounted a-pencilsimilar to the pencil I. This tubular member is provld'ed'with transverse indentations 3i and longitudinal indentations 32, bothat the right end of the tube as viewed in the drawings and this tube is closed at the left end as shown at 33. In-this modified-form the outer sheath or casing is entirely omitted for the sake of simplification and economy. In order to compensate for the stiffness afforded by the casing 20 in the first described modification,

I make the tube 30 of slightly thicker material,

as will be understood. outer. surface of the tube 30 may be finished by corrugating, knurling, or otherwise finishing to provide a friction surface, if desired. v

Another adaption of this invention is illus-,- trated in Fig. in which this improved gripping device is shown associated with a usual inexpensive type of drafting compass 4|. This drafting compass 40 is shown as having the

usual arms

41 and 42, the arm 4| being formed with a center point liandthe arm, 42 being iormed with-a substantially tubular member 44 provided with transverse indentations ll and longitudinal indentations 48. The interior construction of the inward projections in the tube portion 44 is substantially identical with that previously described, and the mounting of the pencil is eflected in the same manner as in the preferred adaptation.

vertical pressure is usually exerted on the pencil which frequently causes the pencil, in compasses of this type with which I am familiar, to slip in the holding sleeve.

In many compasses also, in order to overcome this difilculty, clumsy screw devices are provided which constitute an obstructime to adjust.

tion in the use of the compass and require much It will be evident that the present invention discloses a simple and yet eii'ec- 'tive device for preventing endwise movement the pencil in its holderand which at the time permits the easy removal of the pencil from the compass for the purpose of sharpening, and likewise'makespossible the easy axially shifting of the pencil to compensate for the wear of the point.

The forms of this invention described above,

" all include two series of transverse gripping teeth, each series consisting of six inwardly projecting teeth l2, this being the number of the sides of the pencil shown. All of the teeth in one series are located in the same transverse plane and thetwo series are spaced from each other lbngitudinally by a substantial distance.

The longitudinal inwardly projecting tongues I: are six in number, also corresponding with the number of ridges on the hexagonal pencil shown, and are positioned so as to intersect the transverse teeth l2 and are, in fact, of a length greater than the space between the two series of It is notessential, for instance, thattwo series i of teeth l2 be provided, as one series is very satisfactory. It is also not necessary that the number of teeth be the same as the number of sides or ridges of the pencil, as it is entirely practical to provide teeth to grip only a few of the ridges, without sacrificing the emcacy of this device. It will be understod, however, that the firmness of grip and the resistance to axial shifting will increase directly with the number of transverse teeth engaging the pencil.

In any event, I prefer to use a number vof teeth which is a multiple of the total number of ridges on the pencil for the purpose of securing a balanced arrangement of stresses.

The longitudinal tongues likewise need not nec In compasses of this type a direct endwiseessarily be the same in number as the number of ridges on the pencil. Essentially it is necessary only to provide one such tongue which will engage one of the ridges, that being suilicient to arrest the rotation of the pencil in the holder. For the sake of balancing the conditions, however,

I prefer to employ a plurality of these tongues illustrated in Fig. 7 in which a tubular member.

50 is shown having three transverse inward projections or teeth ii and in which three longitudinal tongues 52 are shown, the three tongues being spaced a short distance longitudinally from the teeth 5!. in the same transverse plane it is understood While the teeth 5| are all shown 25 that this is not obligatory, as the teeth might be disposed in diiierent planes relatively to each other without affecting the practicability of the holder. I

' The inwardly projecting teeth in the formsof the invention thus far described all have inner edges which are substantially chords across the bore of the holder. In the broader aspects of this invention it is not essential that these teeth be in the form of segmental walls or fins across the bore. It is necessary only that the teeth project a suiiicient distance inwardly to be adapted to form a recess or groove in the projecting portions of the pencil whenthe, pencil is rotated and that these teeth remain in these recesses when the rotation ofthe pencil has been arrested by the longitudinal stops. The bottoms of the teeth may have any desired contour within the limits just mentioned. For the purpose of illustrating one other form of teeth I have shown,

in Fig. 17, a tube 60 provided with teeth 6| which are considerably less in transverse extent than the teeth l2, which effectively lock the pencil axially and which are positioned relatively to the lm gitudinal tongues 82 so that the teeth 6| prevent axial movement of the pencil when the ridges of the pencil engage the tongues 62.

The tubular member II in the embodiments illustrated is shown as formed from" a metallic tube. It will be understood that this tubular member may have any des ed exterior shape and thatit may be formed 0 any other material sure of the teeth I 2 inthe recesses 9 formed in the ridges I of the pencil, thus preventingthe inadvertent loosening of the pencil. It is also feasible to form the inwardly extending projections by imbedding these projections, or a collar 1' aoaaa o including theprojections, inanytype of'jplastic moldedmaterial thereby securingthe desirable wearing qualities of the projections in a. molded or die cast holder.

- In its broader aspects'it is not essential that a continuous circular bore be provided to receive the pencil. Aiseries of spaced supports for the pencil would be theequivalent of the circular bore. A plurality of sets of spaced teeth or knife edges I2, such as those shown, without any circular bore would also effect the same purpose of preventing holder.

The pencil is illustrated as hexagonal. This invention is not limited to the use of a hexagonal pencil and the pencil sheath might be octagonal, square, triangular, or have any other suitable number of sides, in which case the gripping means I in the holder would have to be correspondingly forth whether or not altered as will be understood. Faces of the sheath of the pencilmight also be slightly concave instead of plane.

As will be understood, any other suitable type of eraser may be conveniently mounted into the upper end of the lengthener in place of that shown, as the conformation'of the inwardly directed projectionis adapted to firmly grip many forms of standard erasers.

Many other modifications of this invention and its application will naturally occur to those skilled in this art, and the present disclosures should therefore be considered as typical only, and I desire not to be limited to the exact construction shown and described.

I also desire to point out that the novel structure set forth in the claims may be used either as a-separate holder or lengthener to aid in the manual gripping of the pencil, or the structures set forth in the claims may be used in association with or in combination with any other auxiliary device such, for instance, as the compass illustrated in Fig. 5, and. no claims are appended to include combinations of these improved holders with these auxiliary devices, as such claims would constitute aggregations only and would therefor be informal. The claims are accordingly intended to. cover the pencil holding structures set they are associated with other devices. I

What I claim is: 1. A pencil holder having a generally tubular body formed with a relatively narrow inwardly cluding a tubular portion whose inside diameter is substantially the same as the diameter of the ridges of the pencil, a transverse indentation in the wall of the tubular portion and a longitudinal indentation in the tubular portion, the length of the longitudinal indentation being substantially greater than the longitudinal dimension of the transverse indentation.

4. A pencil lengthener for holding polygonal pencils having a generally tubular opemng adapted toreceive the pencil and having inwardly projecting transverse-fins, adapted, upon rotation of free lateral movement in the the bore and a relatively narrow inwardly prof" jecting tongue disposed longitudinally of the bore,

verse circle of the tube and the longitudinal pencils including a .geri'erally tubular -member vcil, to resiliently distort the tubular member, and

ridges of the pencil, whereby the pencil is prevented from' moving; axially, and said opening having inwardly projecting. shoulder means adapted to engage one of the ridges of the pen- 5 oil when said fins are imbedded in said ridges,

' whereby the rotation of the pencil is arrested.

5. A pencil'lengthener for holding polygonal pencils formed with a plurality of ridges; and

plane faces, said lengthener having a generally lil tubular bore and being provided with means adapted, upon rotation of the pencil, fori'ormingindentations in the ridges of the pencil, positive means for,ar-resting the rotation of thepencil in one direction, and friction means'tending to re- 5 tard the rotation of the pencil in. the opposite direction. r j

6. A pencil lengthener for holding polygonal pencils with plane, faces and ridges, having a generally cylindrical bore of substantially the same diameter as the circle-circumscribed about the poly onal pencil and provided with a plurality of inwardly projecting spaced transverse teeth, the inner edges of said teeth being angularly positioned to contact a plurality of-spaced faces of said pencil and adapted, upon rotation of the pencil, to form recesses in the ridges of the pencil.

7. A pencil lengthener for holding polygonal pencils, having a generally tubular bore and hav- 30 mg a plurality of spaced indentations projecting into said bore and adapted to substantially contact the plane facesof said polygonal pencil and adapted, upon rotation of the pencil, to form recesses in the ridges of the pencil, some of said 35 indentations being located in one transverse,

plane of the tubular member,- and other of said indentations being located in a transverse plane spaced from the first named transverse plane;

and means adapted to arrest the rotation of said 4 pencil in one direction. a a

8. A pencil holder for holding polygonal pencils, having a generally tubular body with an opening of substantially the same inside diameter as the diameter of the circle circumscribed about the polygonal pencil, and formed with an inwardly projecting transverse tooth and with an inwardly projecting longitudinally extending tongue, said longitudinally extending tongue being located in an axial plane passing thru said transverse tongue adjacent one end thereof.

9. A pencil holder having a generally cylindrical bore formed with a relatively narrow .inwardly projecting tooth disposed transversely of said longitudinal tongue and said transverse tooth intersecting each other, the bottom of said transverse tooth forming a chord of the transtongue extending substantially to the bottom of .the transverse tooth.

10. A pencil lengthener for holding polygonal made of resilient material, said tubular member being formed "with inwardly projecting transverse indentationsadapted to. substantially contact the plane faces of said polygonal penc and adapted, when engaged by the ridges 01 the rotating penbeing formed with inwardly ojecting shoulder indentations adapted to abut e ridges of the pencil, and a casing enclosing said tubular mem-.-

ber whereby said indentations are concealed and 75 the pencil, to form transverse grooves in the pencils, having a generally tubular body formed of relatively resilient material, said body being whereby the resilience of said tubular member is reinforced.

11. A pencil lengthener for holding polygonal pencils having a generally tubular body formed of relatively resilient material, said body being formed interiorly with an inwardly projecting transverse tooth whose bottom forms an edge substantially equal in length to the width of one of the faces of the pencil, said tooth being adapted, upon rotation of the pencil, to be sprung outwardly by the. engagement of the rotating .ridges of the pencil with the bottom of the tooth,

whereby the tooth exerts a resilient pressure against the ridges of the pencil.

12. A pencil lengthener for holding polygonal one direction and whereby the rotation of the pencil is positively arrested in the other direction.

13. A pencil holder for holding a polygonal pencil, having a bore adapted to receive the pencil and formed with inwardly projecting spaced teeth adapted, upon rotation of the pencil, to form recesses in the ridges of the pencil and means adapted to arrest the rotation of the pencil,

said means being located to arrest said rotation when the teeth are imbedded in said recesses.

14. A pencil holder for holding polygonal pencils formed with a plurality of ridges and plane iaces, said holder including a generally tubular bore provided with means longitudinally fixed relatively to the holder and adapted, upon rotation of the pencil, to form indentations in the ridges of the pencil, and means for arresting the rotation of the pencil before the periphery of the.

pencil has advanced a distance equal to the width of the one face of the pencil.

15. A pencil holder for holding polygonal pencils, having a generally cylindrical bore, andformed with a plurality of transverse inwardly projecting teeth whose inner portions form chords across the bore and which are adapted, upon rotation of the pencil, to cut progressively deeper indentations in the ridges of the pencil as the ridges intersect the teeth, and pencil positioning means adapted to engage one of the ridges of the pencil for arresting the rotation of the pencilbefore the ridges reach the ends of the chord forming teeth.

16. A pencil holder having a generally'tubul'ar body formed with a cylindrical bore provided with a transverse inwardly directed tooth, the inner edge of said tooth forming a chord extending in a substantially straight line interiorly across the bore of the tubular body, the ends of said chordal inner edge intersecting the wall of the body.

17. A pencil holder ior'holding polygonalipencils having substantially flat facesand ridges,

said holder being provided with a generally tubuwhose, inner edge forms a chord across the bore portion, the length of said inner edge being substantially equal to the width of one of said flat faces and said inner edge being adapted, upon rotation of the pencil in the holder, to form a progressively deepening groove in one of the ridges of the pencil as the pencil is rotated, whereby the pencil is prevented from moving axially in the holder when the fin is imbedded in the ridge of the pencil.

18. A pencil holder for holding polygonal pencils having substantially flat faces and ridges. said holder being formed with a bore whose diameter is substantially the same as the diameter of the ridges oi. the pencil, and is providedvwith a plurality of circumferentially spaced inwardly projecting transverse iins formed with substantially straight inner edges intersecting the wall' of the bore at their ends, said inner edges being of a length substantially equal to the width of one of the flat faces of the pencil and bein adapted upon rotation of the pencil, to form transverse grooves in the ridges of the pencil, whereby the pencil is prevented rrom moving axially when the fins are imbedded in t e ridges of the pencil. I JAMES; P; KUSA.