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35, T193. 2, wäß@ p, 5, HAU-RDN MECHANICAL PENCIL Original Filed Aug. >2l, 1929 ,Eli „TM `E , uNvENToR . PAU L. S HAUTON EY HIS ATTORNEY W ¿QW 2,108,668 Peienied Feb. 1s, 193s UNITED STATES PATENT OFFICE i 2,108,668 MECHANICAL PENCIL Paul S. Hauton, Atlanta, Ga. Original application August 21, 1929, Serial No. 387,542. Divided and this application Septem ber 21, 1932, Serial No. 634,099 5 Claims. (Cl. 1Z0-18) operating parts in partially disassembled condi My invention relates to pencils of the “me tion. chanical” type, having means foradjustably pro jecting and electing the lead, and is a division of Fig. 5 is a detailed view of one form of- operat-4 my copending application Serial No. 387,542 filed ing screw or helix. Fig. 6 is a similar view of a modified operating August 21, 1929. ' The purpose of the invention Ais to provide a generally improved, simplified and economical structure, and especially to provide an improved screw or operating helix, guide sleeve, lead grip and ejecting pin. In pencilsof Lthis class, the operating screw or helix has frequently been in the form of a helical wire or strip with spaced turns, and in such devices the spacing of the turns is liable to alteration after assembly of the pencil. I pro vide an operating screw or helix consisting of an originally flat straight strip of sheet metal, and coil it into a helix with the strip edges in con tact, the strip being cross-sectionally formed to 2 provide a channel; or else I interpose a helical wire between the edges of the strip, so that in either case the turns of the strip are secured against variations in spacing. I also provide in combination with the operat-v ing screw'and a slotted guide sleeve, a lead grip sleeve therein, and ejecting pin within the grip sleeve, and lugs on the grip sleeve and pin en gaging the helix of the screw,- together with a sleeve near the vtip end of the pencil case or body 30 and arranged to receive the grip sleeve lug while the sleeve is in ejecting position. II'he guide sleeve ls also arranged to have frictionalV co operation with the grip sleeve lug to secure the proper relative positioning of the grip sleeve and 35 ejecting pin as thevlatter is withdrawn to permit the insertion of Aa Vfresh lead. 'I'he characteristics and advantages of the in vention are further suñiciently referred to` in ' screw or helix. / ' Referring first to Figs. 1 to 5: In the form shown, the case or body l is of relatively thick section and may be of wood, al though the case structure may be varied without 10 affecting other features. The operating screw - or helix 2 extends throughout the greater part of the length of the case bore and may have a frictional .fit therein, which is suilicient to secure the helix against rotation.` In the form shown in Figs. 1,‘2 and 3, the screw consists of an originally flat strip of sheet metal, the edges of which are bent at right angles to form shallow flanges 3. This strip is wound or coiled into helical form with the flanges in contact, thus producing a wide helical channel or thread formation li to co ’ operate with lugs of the grip sleeve and ejecting» pin, as will appear. In the variation shown in Fig. 5, the metalr strip is formed with a, central bead 5, so that when wound to helical form, the edges of the strip abut and the successive turns of the bead 5 provide the screw channel therebetween. ’ In the variation shown in Fig. 6,> the metal strip 2a is flat without edge flanges or bead and it is Wound into helical form with an interposed wire 5, also hellcally wound and with which the edges of the strip engage, the wire in this case providing the sides of the screw thread formation or channel, the bottom of which is formed by the inner sur face of the strip. l A short sleeve or tube 6 is inserted with a fric tional fit near the tip end of case l; this sleeve connection with thefollowing detail description 40 of the accompanying> drawing, which shows cer vbeing cylindrical and providing a chamber to 40 tain respective embodiments. After considering receive the lead grip sleeve lug in one operative' , these examples, skilled persons will understand position, as will appear. Within the helix 2 is a longitudinally slotted that many variations may be made without de guide sleeve l, the upper end of which is pro parting from the principles disclosed, and I con vided `with prongs 8 inserted and clenched in 45 template the employment of any structures that are properly within the scope of the appended claims. ' ' ' Fig. 1 is a longitudinal section of a pencil em. bodylng the invention> in one form. - ' Fig. 2 is a similar section of the lower end portion, showing another operative position. Fig. 3 is a similar view showing still another operative position. _ u ‘ Fig. 4 shows ~the vvguide sleeve and certain co. slots in the upper end 9 of a thimble I0, which is revolvable on the reduced` upper -end portion of the case and secured against kaxial displace ment by a bead ii pressed in the sleeve and engaged in an angular channel ln the case. A sleeve I2 is frictionally engaged over thimble l0. Instead of a plurality of slots obviously one slot might accommodate both prongs. The outer portion of sleeve l2 receives an eraser I2a, or a cup or thimble I3 of sheet metal in which the 2 2, 108,668 eraser may be placed, removal of thimble I3 being prevented by pressing or spinning inward the edge I4 of sleeve I2. By the described arrange ment, the guide sleeve 1 may be rotatedin rela tion to the case and helix 2 by turning sleeve I2. A lead grip sleeve I5 is slidably located within the guide sleeve, and the grip sleeve has near gage .in the screw channel; and thereafter both of the lugs are withdrawn toward the upper end of the case and in properly spaced‘ relation, as above referred to, by rotary movement in the screw channel as impelled by the guide sleeve. I thus provide in a simple vand inexpensive structure, for positive regulable projection of the its upper end a, closed slot I6 to accommodate a lead, for positive lead butt ejection, and for con relatively long _and narrow lug I1, of an ejecting venient reloading, with definite control of the pin I8, which is slidably located within the grip grip sleeve'and ejecting pin during reloading, 10 sleeve. The lug I8 may be formed by bending and positive retraction of the grip sleeve with the pin, as clearly shown in Fig. 1. ’Below slot the lead into the pencil after reloading, all by I6, the grip sleeve has formed thereon a rela manipulation of the one controlling element, tively long and narrow lug I9, passing through namely, sleeve I2. ~ 15 the slot of- the guide sleeve. Lug I1 also passes I claim: 15 through the slot in guide sleeve and both the. 1. A mechanical pencil comprising a casing lugs engage in the channel of the screw or helix having a reduced cylindrical end,v the cylindrical 2. A lower end portion of the slot in the guide end forming a shoulder and an axial internally sleeve is relatively narrow or constructed as at threaded bore in the casing coextensive with the 20 20, Fig. 2, for frictional cooperation with lug. I9, casing and reduced end, a slotted' rotatable feed 20 as will appear. The lower end of the grip sleeve tube in the casing bore having a split end form is slotted as at 2| to provide a lead grip. ing locking prongs, an inverted thimble jour lA metal tip 22 is fixed at the lower end of the naled on said reduced end having an opening case by providing it with an upper or sleeve por engaged by said prongs to lock the thimble and 25 tion 23 telescoping within sleeve 6 and friction slotted tube>r together, the lower` circumferential ally or otherwise retained. The bore 24 at the edge of the thimble riding on the shoulder, a lower end of tip 22 provides a lead guide. A lower manually operable sleeve of substantially the inner portion of the tip^22 is recessed or conical same outside diameter as the casing frictionally as at 25, so that'when in ejecting position, the ñtting the outside of said thimble and projecting 30 lower end of the grip sleeve will engage in this i above the upper end thereof to conceal the end 30 conical portion, the guide bore 24 to check fur of the thimble and having its lower circumferen ther outward movement of the grip sleeve. tial edge riding on the shoulder. 10 When a fresh lead has been inserted in the 2. A method of producing a mechanical pencilA lead grip‘and the grip sleeve is withdrawn to including laterally bending edges of a thin fiat 35 any intermediate position Within the pencil, the sheet metal strip to form thin ñanges along each grip sleeve and ejecting pin I8 are positioned as ‘ edge of the strip, then tightly coiling the flanged shown in Fig. 1; that is, the lower end of the` metal strip to form an internally threaded tubu pin vI8 is withdrawn from the lower end of the lar member of small diameter and then snugly grip sleeve sufficiently to permit proper' engage fitting the tightly coiled tube in a casing bore, ment of the lead end within the gripping forma the bore being of substantially the same di 40 tion of clutch of the sleeve, this proper position ameter as the outside diameter of the tubular ing of the grip sleeve and pin being maintained member whereby the tubular member is- pre by engagement of their respective lugs i1 and I9 vented from uncoiling and the edges of the coils in the screw channel. The lead is then projected are maintained in contact. as desired by rotation of sleeve I2, thus causing 3. A mechanical pencil comprising a casing rotation of the guide sleeve 1 which in turn having a reduced cylindrical end, the cylindrical causes the lugs I 1 and I9 to rotate and to be end forming a shoulder and an axial internally moved downward, with maintenance of their threaded bore in the casing coextensive with the casing and reduced end, a slotted rotatable feed tube in the casing bore having a split end form 50 ing locking prongs, an inverted thimble jour nailed on said reduced end, having an opening engaged by said prong to lock the thimble and slotted tube together, the lower circumferential edge of the thimble riding >on the shoulder, and a manually operable sleeve of substantially the proper spacing, as controlled by the screw chan 50 nel or helix. When the end of the grip sleeve approaches the lower end of the conical forma tion 25 of tip 22, lug i9 passes out of the screw channel or helix and is located in the clear an nular chamber provided by sleeve 6, and the 55 grip sleeve is, therefore, permitted to remain stationary while continued rotation of sleeve l0 causes further outward movement of the eject ing pin by cooperation of its lug with the screw channel, and finally the end of the pin forces 60 out the lead butt, as shown in Fig. 3. Reverse rotation of sleeve I2 then first re tracts the ejecting pin’by movement of its lug I8 in the screw channel while th`e grip sleeve is prevented from upward movement by frictional 65 engagement of its lug I9 in the narrow slot por tion 20 of the guide sleeve. This condition con tinues until lug I1 engages the upper end of slot I6.I At this time, the lower end of the eject ing pin is withdrawn suiiîciently to permit in 70 sertion of a fresh l'ead into the gripping end of the lead grip sleeve, and further rotation of sleeve I2 4in the reverse direction then acts by engage ment of lug I1 with sleeve I5 at the upper end lof slot I6, to retract the grip sleeve longitudi 75 nally until its lug I9 is in position to again en same outside diameter as the casing frictionally iitting the outside of said thimble and projected above the upper end thereof to conceal the end of the thimble. ~ 4. A mechanical pencil comprising a casing having a reduced cylindrical end, the cylindrical 60 end forming a shoulder and an axial internally threaded bore in the casing, a slotted rotatable feed tube in the casing bore having a split end 65 forming locking prongs, an inverted thimble journalled on said reduced end, having an open ing engaged by said prong to lock the thimble and slotted tube together, and a manually oper able sleeve frictionally fitting the outside of said 70 thimble and projected above the upper end there of to conceal the end of the thimble. 5. A mechanical pencil comprising a casing having an axial internally threaded bore in the casing, a slotted rotatable feed tube in the casing 75 2,1os,ecs ` 3 bore having a split end forming locking prongs, above the upper end thereof to conceal the end an inverted thimble journalled on said reduced end, having an opening engaged by said prong to lock the thimble and slotted tube together, o! the thimble, the casing having a shoulder por tion to provide a riding surface for the-lower circumferential edge of the thimble. and a. manually operable sleeve frictionally ?t- ting the outside of said thimble and projected \ ' PAUL S. HAUTON.