Патент USA US2134570код для вставки
Oct. 25, „1938. J. MEILNER 2,134,570 PENCIL Filed May 17, 1955 INVENTOR ATTORN EYS Patented Oca-*25, 1938 2,134,510 , UNITED -s'rlrrr-:s .PATENT OFFICE 2,134,570 PmClL :mph Manner, west om“, N. J., mimo: to Eagle Pencil Company, a corporation of Dela ~ Application any 17, 1935, sei-n1 No. 21,945 s claims. (ci. izo-_zatiÄ - My present invention relates to pencils. more 2l. 'I'he two jaws face `each other, _but are spaced particularly to the so-cailed clutch type pencil of by a gap 2l. ‘ ` the character commonly used by reporters. In a preferred embodiment, the chuck con Among the objects of the invention is to pro struction is made from a single tube, preferably vide such pencil, of the utmost simplicity of con struction, in which the worn lead can be ad vanced to writing position in an instant, and re main eiîectively gripped without local weaken ing or breaking under writing pressure. _Another object is to provide a pencil of the above type, of extremely rugged and inexpensive construction, made of few parts that are not apt to become deranged or jammed in use. In the accompanying drawing, in which is J shown one of various possible embodiments of the >several'features of the invention, . - Fig. 1 is a view in longitudinal cross-section o a complete pencil, Fig. 2 is a fragmentary view on an enlarged of brass, having an enlarged inner bore at the sleeve portion I1 to telescope over _the lead tube proper, and having beyond the -sleeve a bore smaller than the lead, the bore being trans versely cut at 21. to remove metal, for defining the two arms 20 and being longitudinally-slotted 10 to afford the wide slots 26 which space the clutch jaws. The lead tube is also encircled by a collar 28 soldered, brazed or otherwise fastened thereto, substantially midway between its ends, said collar 15 having an outwardly extending -fiange 29 serving as a seat for one end of a coil spring 30 en circling the lead tube. The pencil barrel I6 which may be of vulcanite, enamelled metal or the like ` scale in longitudinal cross-section, taken on line - for its main length, has a tapered forward ex 20 2-2 of Fig. 1,- and with the lead removed, ` tremity 3| which latter is preferably of sheet Fig. 3 is a view similar to Fig. 2, showing the metal, the reduced rim 32 at the forward end relation of the parts with the lead in writing of the barrel snapping in back of the shoulder position, l ledge 25 on the chuck, as best shown in Fig. 2, Fig.- 4 is a transverse sectional viewy taken on when the barrel is telescoped over the empty lead 25 line 4_4 of Fig. 3, tube and its encircling spring 30. The shoulder 25 3 Fig. 5 is a sectional view on an enlarged scale, showing the upper or sharpening end of the ledge 25 thus acts as-a latch with respect to rim 32 and blocks removal of the lead tube and its pencil, and „ associated chuck. -Fig. 6 is a plan view of the Sharpener blank shown positioned in Fig. 5. . Referring now to the drawing, the pencil in cludes a lead tube I0 extending substantially the entire length of lthe pencil having soldered to the rear-end thereof the collar Il of a ferrule pre senting an enlarged` cylindrical bearing i2. The upper end of the tube III is closed by a plug i3 soldered or otherwise held in position. Tele scoped over the upper extremity of the ferrule 4 sleeve I2 is a sheet metal cap or thimble AHl held in position by friction and spaced at its lower or skirt end I5 from the ferrule. The upper ex tremity of the pencil barrel i6 is telescoped over the sleeve i2, the skirt i5 of the thimble or cap „ extending over the extremity of the barrel. The lead tube has a chuck conformation at its for ward end, unitary therewith, and preferably com prising a separate sleeve il -soldered or brazed over the tube iii. The chuck comprises prefer ably a pair of jaw members i8 'and it at the outer ends of arms 20 unitary with and protrud ing forward from sleeve il. ‘Each of the jaw members `is conformed at its inner face as a cylindrical segment 2i struck on a radius smaller 55 than »the radius of the thicker pencil lead. At the outer face each of the chuck jaws is enlarged, presenting a forwardly and outwardly flaring body 22 and a tip 23 tapered forwardly to a relatively sharp rim 2l. A narrow shoulder ledge 60 25 is defined between the shank 22 and the tip In the assembled pencil, the rear end of the barrel is lodged as shown in Fig. 1, between the 30 ferrule bearing I2 on the lead tube and the skirt i5 of the cap or thimble il, ‘while the shoulder ledge 25 on the chuck resiliently holds the barrel i6 in position. By drawing the barrel into the thimble I4 against the resistance of spring 30, the 35 jaws I8 and i9 oi' the clutch are permitted to separate, and the lead may now be readily in serted. By then gripping the barrel and pressing with the thumb on the thimble itl, the lead is 40 released and permitted to drop out to any desired writing length, and upon release of pressure on the thimble, the lead is retained in securely gripped position, as best shown in Fig. 3, by the blocking action of the rim 32 of the barrel against 45 the chuck. The chuck is thus retained by the thickness of the lead 3l tov maintain the shoulder 25 somewhat spaced from the barrel rim, as best shown in Fig. 3. Since the inner radius of the `cylindrical chuck 50 jaws is less than that of the lead, it is clear, as best shown in Fig. 4, that the lead will be engaged only by the edges of the chuck elements, the main areas of which elements are out of contact with the lead. The grip is longitudinal, in the particu lar embodiment shown, along four lines 33, '34, 35 and 36, parallel to the axis of the lead and ex tending the effective length of the chuck. It is thus clear that the lead engagement is well dis 2 2,134,570 tributed along longitudinal lines for an extremely effective gripping engagement of the lead. As compared with a construction in which the lead is gripped peripherally, the gripped length by the present invention is several times greater, and, accordingly, the effectiveness of the hold is improved even though a weaker spring be em ployed. Moreover, by this arrangement, the en gaged portion of the lead is reinforced and 10 strengthened, where with peripherally‘engaging ing shall be interpreted as illustrative and not in a limiting sense. Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is: 1. A pencil structure comprising a unitary bar rel presenting a relatively sharp reduced forward edge, a lead tube extending substantially the length of said barrel, a coil spring within said barrel encircling .said lead tube and urging the 10 latter away from the pencil point, said lead tube clutches, the effectiveness of the hold might be accomplished at the cost of locally weakening the , having a lead gripping jaw structure protruding lead by indenting the same peripherally, and this beyond the rim of said barrel and having a taper would lead to frequent breakage, especially under ing portion within said barrel engaged by the 15 the severe service to which this type of pencil is rim of the latter, said jaw structure presenting commonly subjected. While it is preferred to employ a chuck with two jaw pieces, as shown, it is, of course, apparent that it could be made with three or more such 20 pieces, each conformed to engage the lead sub stantially along its edges, so that the main area of the jaw pieces remains out of contact with the lead. It is also understood that the concave con 25 formation of the jaws need not necessarily be on a circular cylindrical arc, but could be angular, or of any suitable cross-section to afford the de sired longitudinal, relatively sharp line of engage ment with the lead. Referring to Figs. 5 and 6, the pencil is illus 30 tratively shown with a simple lead Sharpener attachment. For that purpose, a rigid disk 40 is retained in the cap midway of the length thereof, within a peripheral groove 4|. The lead sharp 85 ener may constitute a hardened steel blank 42 shown in Fig. 6,_ generally rectangular in form with a generally hour-glass shaped longitudinal aperture 43 and lateral tongues 44 near the op posite extremities thereof, bent inward at right 40 angles and gripping tabs 45 protruding midway from opposite extremities of the blank. The met al of the blank, transversely creased at 46, is inserted by its creased portion through a central an external shoulder serving as a limiting stop determining the uppermost position of the lead tube in the barrel. 2. A pencil comprising a sheet metal barrel presenting a reduced forward rim, a rigid lead 20 tube in said barrel having as a unitary part at the forward end thereof- a pair of spaced arms, each having an enlargement near its forward ex tremity presenting jaws protruding from the rim of said barrel, said jaws presenting longitudinal 25 edges to grip a lead, a coil spring within the bar rel engaging the lead tube to propel the same away from the point, said enlargements tapering at the barrel enclosed portion to cause the rim of the latter to draw the jaws together for longi 30 tudinally gripping the lead, said jaws each pre senting an external shoulder serving as a limit ing stop determining the uppermost position of the lead tube in the barrel. 3. A lead pencil comprising a lead tube having 35 a pair of spaced rigid jaws presenting longi tudinal lead gripping edges, each of said jaws of concavity to be free from engagement of the lead between said edges, said jaws having an inter mediate peripheral shoulder and tapering toward their upper and toward their lower ends, a sheet metal pencil barrel encircling said lead tube and presenting a reduced forward rim encircling the tapering u_pper end of said jaws with the lower aperture 41 in the cap. The fold or crease 46 becomes lodged in a central aperture 48 in the . end of said jaws protruding beyond said rim and disk 40 and the lateral tongues 44 serve as stops against the end wall of cap or thimble I4. For sharpening, the lead is simply inserted through the opening 41 and turned, so that the oblique 50 edges of the hour-glass shaped opening 43 serve as cutting edges to produce the desired conical point on the lead, before insertion thereof through the chuck opening at the forward end of thei pencil. If desired the cap can be removed "Ji Si and held over the lead while in the pencil. It is, of course, understood that the Sharpener appliance, while desirable, is not an essential part of the combination and that if dispensed with, the thimble would be closed or equipped 60 with a removable eraser, if desired. It will thus be seen that there is herein de scribed vapparatus in which the several features of this invention are embodied, which in its ac tion attains the various objects of the invention 65 and is well suited to meet the requirements of practical use. As many changes could be made in the above construction and many apparently widely differ ent embodiments of this invention could be made 70 without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying draw said shoulder serving as a limiting stop between said lead tube and said barrel and a coil spring in said barrel reacting against said lead tube to cause theinner tapered portion of said jaws to be forced toward each other by the engagement therewith of the lower rim of said barrel. 4. A pencil structure comprising a lead tube having lead gripping jaws at the forward end thereof, a unitary sheet metal pencil barrel en circling said lead tube and presenting a relative ly sharp lower rim, said jaws having means thereon cooperating with the lower rim of said barrel for forming a latch connection therewith, and spring means tending to draw said jaws into said barrel. 60 5. A pencil structure comprising a lead tube having lead gripping jaws at the forward end thereof, a unitary sheet metal pencil barrel en circling said lead tube and presenting a rela tively sharp lower rim,` said jaws having means 65 thereon cooperating with the lower rim of said barrel for forming a latch connection therewith, and spring means tending to draw said jaws into said barrel, the external portion of said jaws above said means having an externally tapering 70 portion. JOSEPH MEILNER.