US1805673A - Lead pencil - Google Patents

Description

May 19, 1931. A. F. POOLE LEAD PENCIL Filed oct. 15, 1924 Patented May 19, 1931 v narran STATES "PATENT ori-ica ARTHUR POLE, OF WESTBORT, CONNECTICUT, ASSlGNOR TO WAHL COMPAINY, Y 1 f .'.fOFKCHICAG-O, ll'.|2[i1l\l'0$,- A CORPORATION 0F DELAWARE v LEAD rENcIL Applicationled October 15, r1924. 'Serial No. 743,841.

My invention relates to new and useful improvements in lead pencils and more particularly to a mechanical pencil of that typeemploying a plunger forpropelling a lead and 5 provided with a magazine for holding eXtra leads. f' f n v Among the objects of my invention are to provide aconstruction wherein the pencil casing is composed .'of sectionsgwhich may ybe is readilyseparated Vfor the introduction of leads to the lead magazine or for yplacing a casing in such a manner that the lead maga'- zine isexposed 'ands'o that a new lead'may:

7.5 be readily and `quickly transferred from the magazine into lead propelling position; to provide a novel pencil construction wherein the lead magazine is arranged contiguous to the pencil tip, together with a two-part casing adapted to separate between the tip portion and the magazine portionjso as'to permit Athe quick transfer `of the lead from the magazine to the tip, such construction including a lead guide constructedland arranged to assist in the guidance of the leadduring the transferring operation;"toiprovidea novel pencil construction including a rubber erasing meinber disposed at'the rear end of the pencil and v a cooperative lead propelling'member which ber eraser outwardly'as itbecomes worn ;v 'to provide an improved construction for attach ing the clip tothe pencil casing toprovide thesey and other objects of invention which followingspecification when taken in connection with the accompanying drawings where- 1n:= r

Figure l is a longitudinal section lthrough the pencil; v v Y.

yend of the section 2 is interiorly threaded to j is constructed and arranged to force the rub' described.

will be more apparent froma perusalI of the Figure 2 is a fragmental longitudinal sec tion on a plane at right angles to that shown in Figure 1. Y v

i Figure 3 is a longitudinal section through a slightly modified form of pencil.

Figure yl; is a fraginental longitudinal sec'- tion on a plane at right angles to .that shown. in Fig. 3. i

` Figure 5 1s a section on lline 5-5 of Fig' Brel.. i l56() lncarrying out Vmy invention I provide a casing formed of the cylindrical section 1 and the conical section 2 which are connected by the sleeve 3, thatend of the sleeve extending within the end of the section lbeingsoldered `65 or secured thereto in any other lsuitable manner and that section extending into` the secvtion 2 being eXter-iorly threaded to engage inf terior threads formed the large end of the section 2. That end of the sleeve which isin y70 the section lis interiorly beveled,as shown4 lat 4, fora purpose whichv will Vappear as thev description proceeds, and the outeror small receive the threaded shank 5 of a tip ,6 Which is provided with ridges as shown in thepatent -to Keeran No. 1,151,016. The end of the section 2, connected to the sleeve, is provided ywith a bead 7 which aids in concealing the `l joint between the two sections. Av guide tube 8 'issecured in the conical section 2 by `mea-ns .of a washer 9 which is secured to both the i tube and interior ofthe section, and as shown, the inner end of the tube is exteriorly beveled and secured to the interior of the section at-85 10. The parts are preferably secured by soldering or may be secured in any other suit-y able .mannen rlhe inner end, -of the guide tube extends within the sleeve 3 and is interiorlybeveled as shown at 11 to form a `guide 9o vforthe insertion of a lead aswell as to positionthe'propelling plunger rod, to be later Secured within theopposite end of the section lis a sleeve 12 having ythe arm 13 ofa spring clip 14 secured thereto by soldering or other means, said arm of the spring clip Abeing received in a slot formed in the section of the casing. Adjacent the ,outer end the' @leere @las e @011er l5 Spun @haar adartedruo to be received in a groove formed around the exterior of a cap 16, such connection allowing f `the cap to be rotated with respect tothe sleeve.

A washer 17 is received in the cap and forms an abutment for the inner end of an eraser 18 which is held in the cap by the in-turned edge 19 which embeds itself in the eraser.

The cap 16 has a longitudinal bore which receives the end of a tube 20 having interior screw threads 21 rolled therein, said tube being connected to turn with the cap. Secured Within the section 1, of the casing, intermediate the ends and spaced from the inner end of the threaded tube 20, is a collar 22 forming a support for the inner ends of the sections 23 and 24 of a'plunger tube. The section 23 of the plunger tube extends through the threaded tube 2O and has a slot 25 formed therein to receive the offset portion 26 of a plunger rod 27 ,the oflset portion having notches 28 therein to receive the threads 21 of tube 20. The outer end of the section 24, of the plunger tube, `is received in the beveled end 11 of the guide tube 8 and the plunger rod 27 is adapted to extend through the sections 23 and 24 of the plunger tube and enter the guide tube 8 to propel a lead through the guide tube and tip 6. An extension 29 is formed on the olfset portion 26, of the plunger rod, and operates in the plunger tube. rlhis extension is adapted to engage the washer 17 and force the eraser from the cap 16. It will be understood that it will be desirable to force the eraser from the cap as it becomes worn so that the eraser may be used substantially its en- -tire length. The pencil lead in position to be propelled is shown as 30 and the extra leads are'shown at 31.

' Having fully described the detailed construction, it is thought that the manner of using as well as the advantages will be clearly understood. With the parts assembled as shown in the drawings the lead 30 within the 'guide tube 8 is adapted to be propelled by means of the plunger rod 27. The lead will be propelled through the tip 6 and will be held within said tip against rotary movement, in the manner shown in the patent to Keeran above referred to. When it is desired to propel the lead, the cap 16 will be rotated and in turn will rotate he threaded tube 20. The notches 28, in the offset portion 26, of the plunger rod 27, engage the threads in the tube 20, as previously described, and therefore, when the threaded tube is rotated the plunger rod 27 will be slid longitudinally within the sections 23 and 24 of the plunger tube. The said plunger rod enters the guide tube 8, engages the inner end of the lead 30, and therefore propels the lead when operated. By reversing the operation the extension 29, on the offset portion 26, of the plunger rod 27, will engage the washer 17, in the cap, and force the eraser 18 from the cap.

1 of the casing and theirmovement therein Will be limited by the collar 22. The extra leads will surround the section 24 of the plunger tube and space is provided preferably for twelve extra leads, although, of course, it will be understood that by increasing or decreasing the space any number of extra leads might be held. l/Vhen it is desired to insert a new lead in the guide tube 8, the conical section2, of the casing, is disengaged from the threaded end of the sleeve 3. By inclining the cylindrical section 1, the extra leads 31 will pass through the sleeve 3 and one lead may be removed and placed into the guide tube 8. The beveled end 4 of the sleeve 3 acts to guide the extra leads through said sleeve. After the extra lead has been placed in the guide tube 8 the conical section 2 will again be engaged with the sleeve 3. Of course, it will be understood that in order to insert a new lead the cap 16 must be rotated in reverse direction to the propelling movement so as to draw the plunger rod 27 from the end of the guide tube 8. Y By beveling the end of the guide tube 8 as shown at 11 the lead will be guided into the tube.

1n Figures 3 and 4 I have illustrated a slightly modified form of inventionv inwhich the casing is made up of the cylindrical section 32 and conical section 33 connected by a sleeve 34. That end of the sleeve 34 extending into the conical section 33 is soldered to that section, whereas that end which enters the cylindrical section 32 is exteriorly threaded to engage interior threads in the section.

The sleeve 34 is interiorly beveled from the threaded end as shown at 35 for a purpose which will later appear. A guide tube 36 is carried in the conical section 33 and has one end received in the sleeve 34, said end being interiorly beveled as shown at 37 and forming a kcontinuation of the bevel 35 of the sleeve. The opposite end of the guide tube 36 is exteriorly beveled and connected to the interior of the section 33 at 38, the end of the section 33 being interior-ly threaded to receive the threaded shank 39 of the tip 40. rl`he tip will be provided with ridges such as described inthe preferred form of the invention and shown in the patent to Keeran'previously referred to. A bead 41 is formed on the end of the conical section 33 and aids to hide the joint at the point where the two sections are connected.

Secured within the opposite end of the section 32 is a sleeve 42 to which is soldered, or otherwise secured, the arm 43 of a spring clip 44. The arm 43 is received in a slot formed in the section 32. The section 32 has a collar 45 spun adjacent its outer end and the collar is adapted to be receivedin a groove 46 formed in the exterior of a cap 47. The cap has a recess formed in its outer end to receive an eraser 49 and the inner end is provided with a projection 50 to which is seplunger rod 58. This offset portion is prol. -A pencil coinprising a ycasing v'section cured, by soldering or other means, the' end pencil tiporleadfguide 8,;and the front end of a rtube 51 having interior :screw threads of thelead magazine,I and 'especially inl arf 52 rolled therein. A collar' 53'is secured in ranging the lead guidef-.Witha tapered -forthe section 32 intermediate the ends thereof Ward portion,theffacile transfer :of the .lead

5 and forms a support for the vinner ends of from the magazine tothe Alead guide in the .70

sections 5 4 and 55 of ai plunger tube; The pencil-tipis secured. section 54 has a slot 56 extending substanl Having fully described myinvention,what tially throughout itsV length and this slot I claim and desire to secure by'Letters Patforms a guide for the offset portion 57 of the ent is vided with diagonally extending notches 59 having a centrallead guide tube, lead yproadapted to engage the threads 52 of the tube pelling mechanisrnincluding a threaded tube 51 so that as the tube 5l is rotatedV by the and av plunger adapted to 'be inovedthrough cap 47, the plunger rod Will be fed longisaid lead guide, a pencilztip detachablyfcony tudinally, through the sections 54 and 55 of nected to the frontof said-,casing section .and 80 the plunger tube. f having lead guide tube adapted to register The outer fend of lthe" section 55 of the Withthe'fflead guide tube of said casing Secplunger tube is receivedv in the conicalrecessl tion, therearmost portion of said ylead guide 35yo'fl the sleeve 34 and terminates a 'short 'tube of saidpencil tip `having va beveled distance from the beveled end of the guide mouth toV facilitate the entrylof said lead into 85 y tube 36. As shown, the plunger'rod 58 1s said tip iead'guide tube, said'casing'section 'adapted to enter the'guide tube 36tofpropel having 'a leadrnagazine disposed about said the lead 60 through thelguidetube and tip casing lead guide tube and having an open 40. The eXtrav leads 6l are. held in thesecend positioned adjacent .and opposite ythe tion'32, of the casing, around the section 55 beveled'niouth of said tip lead guide tubeto 90 of the plunger tube, vand their inner Inovefacilitate the `transfer of.y lead from said ment is limited by the collar 53; magazine to the leadguide tube of said tip. f

j The operation in the modified form of the 2.' A pencil comprising a casing section invention yis substantially thev same as that having-a central tubular lead guide terminate described for the preferred form. With the ing substantiallyv at the f front end of said 95 parts assembled inthe position shown the casing, lead propelling mechanism including lead 60 may be propelledthrough the rguide. a plunger adapted to be moved through Said tube36 and tip y40 by thel rotation ofthe lead guide tube, a pencil tip-fdet'achably con cap 47 which in turn rotates the threaded ,nect-ibleitrthefront of said casingsection,

tubel which feeds the plunger rod'58 longisaid tip including a central tube forming a 100 tudinally through the plunger tube. When lead guidsad tub@ having abeVGlQClPOrtOD it is desired to .insert aneW'lead ythe direcat its rear end to bepositioned oppositethe tion ofl feed of theplunger rod is' reversed front end 'of the leadyguidegtube, of said by turning the cap-47 in the opposite direc'- casing section When said tip is in positionon 40 tion and this rernovesthe end of the plunger said casing section, and. said casing section 105 rod'from the guide 'tube 36.v The'section 33 Ahaving a'leadrnagazine disposed about said of the `casing is then disconnected frointhe tubular lead gudei cylindrical sectionV 32', by rotating to disenle 3. In La pencil, a casingy section having a gagel the threads. By slightly tilting the central lead guide in its front portion4 anda cylindrical section 32' one' of the eXtra `leads yslotted plunger tubein its rear portion, a tip 11o may be kremoved and placed'into the Yguide at the frontend of said vcasing and anjeraser tube 36'. *The lead Will be properly directed seat at the rear endof said casingfor. holdinto the guide tube by the beveledv portion 35 ing an'eraser, a plunger operable in. said lead of vthe sleeve 34 and the beveledend 3'? .of guide, means for moving saidplunger toward i the guide tube. After the new lead is insaid tip and toward said eraser seat, and 115 i serted thefsections 32 and'33 arev again conmeans to cause. said plunger .to` push said nected and the new lead may be fed through, eraser outwardly upon ja predetermined the tube and tip' bythe operation'of fr the movement of said plunger. A L a plunger. 1 'l l r4'. In a `pencil provided with a slotte d p YBy theconstruction shownin bothy forms plunger tube in its frontl portion, the corn- 12o of the invention clogging of theguide tube binationofa casing, avtipv at the front end` isprevented for the reason'that 'the end of offfsaid casing, an ,eraser seatatvthe 11rear the plunger tube lis in close proximity to the end ofsaidl casingfffor retaining an eraser, endof the guide tube, and lead Which'rnay a lead propelling mechanism-operable in said 6G become broken in connecting the two sections 'plungerftube v"for advancing a lead through ,125 of the casing, cannot fall into the guide tube said tip, and means operableby the fmoveoi 'clog the same. i nient of said lead propellingvmechanism for It Will be noted that by providing a pencil pushing said eraser Voutwardly inits seat to construction wherein the casing is separable compensate for the Wear on the eraser.,-4

` l? rta 'pollil niemdate the rear end of the l A mechanical pencil comprising,a.casL 213e ing having atip secured to one end thereof andadapted to receive ,a lead, a partition in the casing intermediate its ends, for forming two compartments, the compartment adjacent the tip adapted for'receiving extra leads, a plunger tube carried by the partition and extending longitudinally of the casing, that e'nd of `the tube entering the compartment removed from the tip having an elongated opening therein, a plunger slidable in the plunger tube and having an offset portion received in the elongatedopening, an interiorly threaded tube rotatably mounted on the end of the plunger tube having the opening therein 'and adapted for engaging the offsetk portion on the plungeigand means for rotating the threaded'tube for operating the plunger to propel the lead in the tip. i A

6. In apencil, the combination of a casing provided with a centrally disposed tubular lead guide and provided at its front end with an interiorly disposed thread, a pencil tip having va portion provided with an external thread "adapted to engage the interior threads on the front endof said casing whereby to permit thedetachable connection of said pencil tip to said casing, said pencil tip having a centrally disposed lead guide tube adaptedto be positioned directly opposite the mouth of saidtubular lead guide of said casing when said tip is positioned on said casing, a lead magazine disposed about said tubular'lead guide, said lead guide tube on said tip having ailaring mouth to assist the feed of said lead into said pencil tip lead guide tube, and means for propellingl a vlead kthrough said lead guide tube. Y

7. A pencilk comprising'acasing, a point portion secured to one end thereof, an eraser holder for retaining an eraser seated therein at the other end of said casing, a plunger guide tube provided with a slot, ay plunger rod carrying a member adapted to project throughv said slot and having grooves, and

' threaded actuating mean-s arranged around ysaid guide tube and `engaging said grooves,

said plunge-r rod being provided with extending portions on each end of said projecting member for expelling said eraser or a lead in said point portion. Y

8. A pencil comprising a casing, a'plunger guide tube provided with a` slot, a plunger rod carrying at an intermediatepoint thereof a member adapted toproject through said slot, helical actuating'vmeans arranged around said guide tube and adapted to cooperate with Ysaid projecting means ytoefect longitudinalmovement of the plunger, means, on

' the exterior of the pencil to operate said helical Aactuating means, means forA retaining a lead at one end kand means forretaining an eraser at the other 'end of Vthe pencil so that either may bevexpelled by the plunger rod.

9. A pencil comprising a casing, a point portion secured to one endthere'off, an eraser holder for retaining an eraser seated'therein at the other end of said casing, a slotted guide tube located centrally thereof, a plunger rod having an intermediate portion bent outwardly so as to project through the slot, the ends ofsai-d rod being aligned and located in said tube, and a threaded cylinder within said casing surrounding said slotted guide tube and adapted to be rotated from the outside of said casing, said projecting portion of the plunger rod being provided with means adapted to cooperate with said threaded cylinder to cause the plunger rod to be moved in either direction for expelling said eraser or a lead carried in said tube and point portion.

10. A pencil comprising a' substantially uniform hollow stem portion, a tapered point portion removably attached thereto, a central elongated tube secured in said point portion and being provided with a bevelled end, a transverse partition in said stem portion dividing said stem' into a front magazine chamber and a rear chamber, a guide member passing through, said partitiomand adapted to be received in said bevelled end of said tube, the rear section ofsaid guide member being slotted, a plunger in said guide member having a projection extending through said slot, and actuating means in said erable from the outside of the pencil and adapted to cooperate with saidV projection to move `the plunger longitudinally, said magazine chamber being empty except for the guide member.

1l. A pencil comprising a substantially uniform hollow stem portion, a tapered point portion removably attached thereto, a lead point guide tube carried in said point portion, said tube being of substantial length for the convenient changing of lead thereinto and having its rear end beveled foreasy insertion of said lead, agtransverse partition in said stem portion dividing said stem into a front magazine chamber and a rear chamber, 4a guide member passing through said partition and supported thereby, said ymember being slotted in the rear chamber and extending into proximity to the lead point guide'in the magazine chamber, a plunger in said guide member having a projection extending rear chamber op- Y llO through said slot, and actuating means in said proximity to the open end of said sai-d magazine chamber.

In witness whereof, I hereunto subscribe my name to this specification.

Ann-rua r. roots.

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