Патент USA US2116136код для вставки
May 3, 1938. « ì A: O. BEISANG` PENCIL ì Filed Aug. 13, 1936 2,116,136 Patented May 3, 1938 2,116,136 .I (Y UNITED STATES PATENT> OFFICE . 2,116,138 PENCIL Aurea o. Belang, St. Paul, Minn., assigner to Brown à Bigelow, St. PauL‘Minn., a c0110?! tion of Mlnnelota ` Application August 13, 1936, Serial No. 95,816 s ein”, (ci. 1z0-1s) My invention .relates to _an improvement in pencils. and~more particularly to a'mechanical pencil of an extremely simple type wherein only a few parts are required. Afeature resides in 5 - a flexible spiral driver which is operated by the head of the pencil, and a spring locking sleeve holds the driver in operating position. Many pencils have been made which- operate mechanically by rotating one vportion of the l C pencil with respect to the other-to expel or repel the lead. Most of these pencils, however, are provided with `quite a number of parts, thus increasing the cost of manufacture. While simple mechanical pencils have been previously 15 manufactured, most of these- simple mechanical pencils omit some important function in the op eration of the pencil when constructed. In other words, the simpliñcation of the construction has been made by leaving oil.' some of the functions of 'operation of the more complicated construc 2 tions. - » . Itis the object of the' present >invention to pro to the other end of the tube, drawing the lead into the tube, before inserting the tube into the outer shell of the pencil, thus protecting the lead within the spirally slotted tube. It is a feature of my invention to provide a lead carrier having means thereon extending out of the tube through the helical slot and into en gagement with the inner walls of the outer shell of the pencil, to provide friction to prevent ro tation of the lead carrier with the tube. A spring 10 tension is provided against the walls of the tube which is sumcient to resist rotation of the lead carrier‘when the tube is rotated. , It is a further feature `of my invention to pro vide a pencil which will not permit breaking of the lead by longitudinal pressure on the lead. The lead operating mechanism of the pencil is sup ported in the outer shell of the pencil by a fric tion means sufficient to hold the lead operating mechanism in place under ordinary writing pres- 20 sures on the lead. If, however, too great a strainr is placed longitudinally on the lead, the lead op vide a pencil with an outer casing which may erating mechanism containing the lead will be ' be made ofy metal or non-metallic material, and forced upwardly with respect to the outer pencil wherein a lead pusher and carrier of a unique ' shell, thus preventing the breakage of lead. 'l'.'his 25 ¿ design is provided having spring bowed portions releasing means of the lead operating mecha.-` which are adapted to friction'ally engage inthe nism prevents damage to the lead as well as the l casing to prevent rotation lof the carrier while operating mechanism by reason of the releas the flexible spiral driving member is adapted to ing of the spirally -slottedtube when too great 3 O be rotated to operate the spring lead carrier to ` pressure is exerted against either the writing propel or repel the lead in the pencil. It is al feature of my invention that when ‘ removed from the outer pencil. shell or casing, lead, or the lead carrier is driven to the front or writing end of the pencil and cannot be driven further. ’ «i ~ the lead propelling mechanism, if held in a ver tical position, will cause the spring` lead carrier c:e Cl to rotate to twirl from one end to the other of .These and _other objects and novel features of my invention will be more' clearly and fully set forth in the following specification and claims. the spiral driving member to permit the removal » " In the drawing forming a part of my- speciñca tion: ` or replacement of lead therein. "I'he lead pro peiling mechanism comprises a tube having a Figure 1 is a longitudinal section of my pencil, helical slot therein, and a lead carrier inter woven through the spiral slot of the tube havingl `a lead carrying end positioned axially in the tube. ’I'he lead carrying end is provided with a slidable ` sleeve for engaging the lead, so that the lead45 moves with the lead carrier. If the tube, when removedy from the louter shell >oi' the pencil, isl held vertically,A the lead carrier will move downwardly in the tube, rotating‘as it moves. 50 in enlarged form. ‘ ` ‘ Figure _2 is an elevation view of or casing of my pencil. > >*'40 -the outer shell e l, Figure 3 is a side elevation view of the tube having the »helical slot therein, mounted on'the head end of Athe pencil. ' . ,1 45 'A ' Figure 4 is a side elevation view, partially in section, of the lead actuating carrier adapted to When the lead carrier reaches its lowermost posi be operated within the tube of Figure 3. Figure o is a cross-sectional view on the lineA tion, it extendsvbeyond the end of the tube. where> 5-,5 of Figure 1. the lead may be quickly Aand readily removed or replaced. When a new lead has been inserted in the sleeve on the/end of the lead carrier, My pencil A is provided with an outer shell l0, tubular in shape, and tapering to a point ll at the lower end thereof. ’I'o the shell I0 is at tached a pocket clip l2, having a pocket engag ing rounded end Il supported by a spring arm 55 ` f the tube may be held Vwith the lower end upper 55 ` most. The lead " carrier will-then freely rotate . . 1l y 2 ~:2,116,130 I4. Attaching flanges Il extend through holes spring tension. The long longitudinal engage in the' shell Il, and are clinched over on the ment will resist the tendency for the lead car rier 21 to rotate with the tube 25. The lead carrier 21 is much more resistant to rotary move ‘insidelof the sneu n at n, to nom the cup lz in proper position. » The lead operating mechanism of the pencil A is mounted upon a pencil head I1. The head I1 is of substantially the same diameter as the shell III, and is concentric with the shell I3. The` ment than to longitudinal movement, making it a comparatively simple matter for the lead carrier to move longitudinally when the tube 25 is ro tated. upper extremity of the head I1 is hollowed out ' 'I'he operation of the pencil is believed clear from the description. 'I'he lead is fed through 10 10 at I8 to accommodate the eraser I3. ’I'he lower portion 23 of the head I1 nts within the shell the lead opening 33 in the point II of the tapered I0, and is of slightly smaller'diameter than the portion of the pencil by 'rotating the head I1 in inside of the shell III. An annular groove 22 is one direction. The rotation of the head I1 acts to rotate the tube 25. Rotation of the tube 25 moves the plunger downwardly in the shell III, the 15 edge of the slot 25 engaging the arms 33, 35 and 31, and acting as a cam to urge the lead carrier 21 downwardly. 'I'he lead carrier 21 is kept from formed in the lower portion 25 of the head I1, 15 intermediate the ends of the lower portion 2li. A split spring ring 23 is mounted in the annular groove 22. This ring is normally of slightly larger diameter than the inner diameter of the shell I0, but is formed of spring material, and readily con 20 tracts slightly upon pressure to slide within the shell III. 'I'he outer surface of the ring 23 is tapered as shown at 24, to permit this ring to rotation by the engagement of the portions 34 and 38 of the lead carrier against the inner wall of 20 the shell I0. When the lead carrier moves sufilciently, the ' slide readily into the end of the shell I0. 'I'he _lower end of the sleeve 28 engages the inner head I1 is accordingly held in the upper end of tapered wall of the shell. Further movement of the lead carrier 21 downwardly will move the 25 the shell I Il under spring tension, the ring 23 impcding longitudinal movement of the head I1 l lead carrier relative to the sleeve 28 until the with respect to the shell I0. As the ring 23 sleeve 28 is entirelyœdisengaged from the lead rotates readily within the groove 22, the rotary 40 of the pencil. movement is not impaired by the friction ring 23. 'I'he angle of the groove 25 in the tube _25 is The lower portion 25 of the head I1 is longi 30 such that when the tube l25 is removed from the 30 tudinally drilled to accommodate _the end of al shell I0, the plunger will move toward one end or tubular member 25. 'I‘he tube 25 is wedged into the drilled opening, so that the tube 25 will ro tate as an integral part of the head I1. 'I'he tube 25 is formed of a strip wound in helical form, the other of the tube when the tube 25 is held vertically. The weight of the lead carrier 21 is suñlclent to cause the same to freely twirl down providing a helical slot or groove 25 between suc cessive convolutions. 'I'he tube'- 25 extends to a point near the lower tapered end II of the shell I0, and preferably contacts the inner wall of the 40 tapered portion to hold the tube in proper posi tion within the shell Il. . A spring wire lead carrier 21 is provided within the tube 25 for actuating the lead. A `sleeve 28 having a slot 29 in one side thereof surrounds, and extends beyond, the lower end of this lead carrier 21. A projection 38 on the vlead carrier 21 near the lower end thereof extends through this slot 29, and holds the sleeve slidable on the lower end of the lead carrier 21. A second pro jection 32 on the lead carrier 21 limits-the sliding movement of the sleeve 23, permitting the sleeve to slide until the lead carrier extends from one end to the other of the sleeve. 'I'he lead carrier 21 is bent at substantially right angles to the axis thereof to provide an arm 33 wardlyin the slot 25. Thus, after a new lead has been inserted in the sleeve 23, the tube may be held vertically with the head I1 down, and the .lead carrier will move toward the head until the lead is entirelyl enclosed within the tube 25, or virtually so. As the friction of the sleeve or ring 23 is all that holds the lead operating mechanism in the shell III, it may be seen that abnormal longitudinal pressure on the lead. will act to force the ring out of the shell I8„thus preventing the breakage 45 of lead when too great a longitudinal pressure is exerted against the same. It will also be noted that the lead operating mechanism may at any time be withdrawn from the- shell I8 Aby a longi tudinal pull on the head I1. In accordance with thepatent statutes I have described the principles of operation of my pencil; The lead carrier 21 is then bent to provide a and while I have endeavored to set forth the best embodiment thereof, I desire to have it under stood- that this is only illustrative of a means of 55 carrying out my invention, and that obvious changes may be made .within the scope of the slightly bowed spring portion 34 engageable with following claims without departing from the spirit the inner wall of the outer shell I0. of my invention. extending through the slot 25 in the tube 25. An arm 35 `att-substantially right angles to the axis of the lead carrier extends through the slot 26 at a point spaced above the arm 33, entering the tube 25. An axially aligned portion 35 extends-to a point adjacent the arm 33, where an arm 31 ex tends through the slot 26 in a direction opposite to that of the arm 33. The arm 31 supports a spring bowed portion 33, which engages the inner wall of the shell III on the side thereof opposite the engagement of the portion 34 of the lead carrier, balancing the engagement of the lead carrier in vtheshell or casing I3 of the pencil, ' It will be seen that the formation of the lead carrier 21 is such as to provide a pair of re siliently supported portions 34 and 33 frictionally 75 engaging the inner wall of the shell Il under vI claim: Í , 60 l. A pencil comprising an outer casing, a head engageable in one end of said casing for rotation, a tapered writing end on the other end lof said casing, a tubular spirally slotted. member extend ing intoI said casing and secured to said head to 65 be operated by the same, and a spring Wire lead carrier formed from a single piece of wire having a lead carrying end extending axially in said slotted tube and an axially disposed portion spaced from the lead carrier end and having oppo 70 sitely disposed spring arms for engaging in the casing to prevent rotation of the lead carrier but permitting longitudinal sliding of the same in the c_a'sing when the spirally slotted tubular lmember is operated by said head. 75 anales 2. A pencil comprising an outer shell'having - . 6. A pencil including an outer casing, a‘ ilex ible tubular helically slotted rotatably mounted a writing end formed on one end thereof. a cylindrical opening in the' other end thereof, and memberY extending approximately through said 'a lead operating mechanism including a head adapted to support an eraser to close said open ing, a collar portion formed on said head hav ing an annular recess, a -spring collar freely dis posed in said recess, a spirally slotted iiexible entire outer casing axially` disposed therein, a unitary lead operating spring wire member hav ing axially disposed portions extending longi tube secured axially in said collar portion of tudinally engageable at angularly spaced points tudinally in said tubular member, and a plu rality of spring arm portions slidable and longi 10 said head and extending into the major por with the inner portion of said casing to prevent rotation of said lead carrier, and a slidable lead socket supported on the front end of said lead tion oi' the writing tip of said casing, and a spring lead carrier interwoven into the spiral slots of said tube having axiallydisposed portions with carrier. 15 variel> oppositely disposed spring shell engaging portions. ' » ' . ì 7. A pencil including an outer casing, a tubular -helical guide rotatably mounted in said shell cas a lead carrying sleeve on one of said portions, ' ing, a lead carrier in said guide, means on said ` `3. A pencil comprising an outer shell or cas ing, a head rotatably mounted on one end there of, a tubular member secured to said head for rotation thereby, a helical slot formed in said tubular member, a spring lead carrier having portions axially disposedr in said tubular mem ber, and spring arm portions extending through said slot from said axial portions and adapted to 25 engage with said shell to prevent rotation of said lead carrier, and a slidable lead receiving socket ` on one of said axially disposed portions df said _ lead carrier. 4. A pencil comprising an outer shell having lead carrier extending through'said helical guideat different points and provided with spring means for engaging said casing under spring ten sion to prevent rotation and to permit longitl - 20 dinal sliding oi' said lead carrierlin said casing, and a lead receiving sleeve slidably secured to said lead carrier, whereby said lead carrier may be operated by said helical guide when said guide is rotated to propel and repel a lead in said pencil. 2.5 8. A pencil including a writing tip, a lead pro pelling and carrying means including an oper ating head, a rotatable locking sleeve, a heli cally slotted tubular member secured .to said a cylindrical inner wall surface. a tubular mem head, and a spring wire leadV carrier having a 30 ber rotatably mounted in said shell, said tubular slidable lead receiving socket thereon, said lead , carrier having spaced apart axially disposed and longitudinally extending portions for guiding said porting a writing lead axially within said tubu carrier, and spring means connecting said axially lar member, means on said lead carrier engage 35 able with said slot, and spring arm means on> disposed portions for engaging within the cas said lead carrier engageable with the cylindrical ing to hold the lead carrier against the rotation. 9. A pencil having- a removable lead propelling surface of said inner wall of said shell to pre vent rotation of said plunger with respect` tol 'mechanism, a casing for receiving said mecha-said shell. A. l nism. said mechanism including a spirally slotted tubular member, a spring wire lead carrier hav 5. A pencil comprising an outer shell, a tubu lar member rotatably mounted in said shell, a ing longitudinally disposed spaced apart portions member having a helical slot, a member for sup- - ` helical slot formed in said tubular member, a axially disposed within said tubular member, unitary spring lead carrier having> portions ex slightly bowed spring arm portions diametrlcally oppositely disposed, and a slidable, lead socket tending longitudinally within said tubular mem ber, and spring arms formed on said lead carrier carried on one oi' said axially disposed portions 45 extending through said slot into resilient en- - of said lead carrier. , » gagelnent with the inner wall of said shell at oppositely 'disposed points. " - vAlîill'ltlslD O. B'EISANG.