US1609729A - Pencil - Google Patents

Description

Dec. 7 1926.

H. W. LARSSON PENCIL Filed Feb. 6. 1923 INVENTO Patented Dec. 7, 1926.

HENRY W. LARSSON, OF OAKLAND, CALIFORNIA.

j PENCIL.

Application filed February 6, 1828. `Serial No. 617,406.

My invention relates to a pencil, and to Referring to the drawing in detail, simithat ty in which the leads are inserted and lar numens refer to similar parts, throughadua ly projected by mechanical means. as out the several views. t e point Wears, The pencil consists of two cylindrical I One of the objects of the present invention parts, the lead receiving, or point section, 56 is to generally improve and simplify pencils and a barrel section 2. These sections are of the mechanical type, to make them easy joined by a friction joint. The joint is to manipulate, and so arranged, that the formed by reducing the point section 1, and leads employed for writing may easily be forming a bea-dll, on its outer end. The l renewed when desired. side Walls of this reduction are split at 60 Another object of the invention is to prol0-10, to allow the bead 11, that is slightly vide a. pencil which consists of a point seclarger in diameter, to enter the barrel 2, and tion and a barrel section, turnably mounted expand into recess 19, formed in barrel 2, with relation to each other by a friction when the joint is assembled. This construcll joint, where a turning movement of either tion makes a turnable friction joint, with a O6 section, in relation to one another, transmits tendency to stay closed, but that may be partan advancing or retarding movement to the ed, when a longitudinal force great enough plunger that propels the leads. 1s applied to force bead 11 out of recess 19. j Another object of the invention is to pro- The guide tube 3 is secured in the pointed vide a release for the propelling mechanism, end of point section 1. It acts as a guide 70 when the pencil is parted for inserting a new for the lead on its way to the tip 21, through lead, thus eliminating the necessity of rewhich the lead 15 is forced. This tip 21 may turning the plunger, or propeller, by turning be a snug fit, or split, to produce a friction any part of the pencil. on the lead. On the lower end of tube 3, a Another object of the invention is to pronut 18 is formed. This nut is split by a num- 75 Vide a magazine in the barrel of the pencil ber of slits 22, and is sprung open, as shown for holding spare leads, and means for partly in Fig. 2, and closed inAFig. 1. The function elevating the leads out of the barrel, so that of this nut 18 is to close over, and engage they may readily be picked out of the magthe. threaded plunger 5, when the two parts ezine as needed. of the pencil are joined, and to open and l0 Another object of the invention is to prodisengage plunger 5, when the pencil is vide the pencil with a mechanism that cannot parted. Y be injured by over propelling or repelling of In the barrel section 2, the tube 4 is mountits plunger beyond its limits. ed. Its upper end is bell shaped, and acts as Further objects will hereafter appear. a closer forthe split nut 18, when the pen- 06 The invention consists of parts and concil parts are joined. In this tube 4 a threadstruction, combination and arrangements of ed plunger 5 is mounted, free to slide thereparts, as hereafter more fully described and in; but prevented from turning therein, by claimed, havin reference to accompanying key 8 formed on its lower end. This key 8 drawings, in w ichl engages in a spline 7, cut in tube 4, as clearly D0 Fig. 1 is a central longitudinal section shown in Fig. 3. Plug 9, Fig. 1 forms a through the pencil. stop for plunger 5, and is secured in lower Fig. 2 is a similar view. showing point, or end of tube 4, as shown in Fig. 1. On the lead receiver, parted from barrel section. lower end of tube 4, a cup 6 is mounted and Fig. 3 is a section of barrel, with the magasecured. This cup has a number of slits 14, i zine elevated, exposing spare leads. forming its side walls into a series of springs, Fig. 4 is a cross section on the line 4 4, that expand and friction a ainst the inside Fig. 1. Walls of barrel section 2. ne of the func- Fig. 5 is a cross section on line 5 5, tions of cup 6 is to friction and follow barn .Fg- 2 rel 2, when turned in relation to point section l 1. This friction is great enough to do all useful work required to propel leads through the tip 21. But should any undue strain be set up in the mechanism, as propelling the plunger beyond its limits, or should the lead be obstructed in its passage through the tip 21, and thus throw an overload on the mechanism, cup 6 will slip in barrel 2, by which it is actuated, thus taking care of the overload, and preventing injury to mecha nism.

Another function of cup 6 is to elevate the spare leads 16-17 out of magazine, as shown in Fig'. 3. To do this work, the tube 4 to whiclicup G is fastened is manually raised in the barrel 2. The cup G frictions along the walls of barrel 2, until it reaches the recess 19. At this point, the spring Walls of cup expand into the recess 19, and engage its upper shoulder. This shoulder stops its upward movement, and thus elevated, the spare leads 16-17 shown in Fig. 3, can readily be picked out of magazine, as wanted.

The collar 1Q is secured on tube 4, and serves as aguide to center tube 4 in barrel 2, and to Vform a cover for the magazine when closed, as in Fig. 2.

In operation, the barrel section is turned relatively to the point section, to advance the lead, or retard the plunger 5.

When the lead is all used up, and the plunger 5 has expelled the last part thereof, and it is desired to insert a new lead, the pencil is parted at its friction joint. In doing so, the nut closer on tube 4: releases the spring nut 1S.V This nut springs open and disengages with the threaded rod 5. This rod is then free to follow the barrel section, and is manually returned to its bottom, or starting point. After parting pencil, the point section is held point downward, the magazine is elevated. as shown in Fig. 2i. :1 spare lead is picked out of magazine, and dropped into point section. It drops freely into the guide tube 3. until it reaches the tip 21, where it rests. The magazine is Closed by manually depressing it into the barrel. f

The pencil parts are now ready to be assembled, or joined. In assembling the two sections b v the friction joint, the bead 11 positions the joint, when it engages in recess 19, the nut closer on tube 4:closes the spring nut 1S, that engages the threaded plunger The pencil is now ready-to operate, by turning one section in rotation to the other to advance the lead or retard the plunger.

I wish it understood that various changes, in form, and proportion, may be resorted to, within the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. A pencil comprising a pair of barrel sections, turnably mounted in relation to each other, a lead passage and split nut carried in one section, a nut closer and a threaded rod carried in the other section, and means for imparting motion to said rod, relatively to said nut.

2. A pencil comprising a pair of barrel sections, turnably mounted in relation to one another, by a turnable slip joint, a lead passage and split nut carried in one section, a nut closer and threaded rod friction ally carried in the other section, means for actuating threaded rod through split nut by a turning movement of either section.

8. A pencil composed of a point section and a barrel section, a turnable slip joint connecting them, a lead passage and a split uut mounted in the point section, a slidable nut closer with a slidable threaded rod carried in the barrel section, means for turning said threaded rod in split nut, causing a forward or backward movement of threaded rod, and means for disengaging split nut with threaded plunger.

4. A pencil composed of a point section and a. barrel section, a turnable slip joint connecting them, means for positioning said joint, a lead passage, a split nut carried in point section, a tube frictionally mounted in the barrel section, with a nut closer formed thereon, a threaded rod slidably mounted in said tube, means for closing nut over threaded rod, and means for opening said nut when the sections are parted.

5. A pencil composed of two sections, a point section carrying lead passage, a split nut and a rotating slip joint, a barrel section carrying a threaded rod slidably mounted in a splined tube, a nut closer formed on said tube, a friction cup carrying said tube in barrel, means for closing said split nut when joining sections, and means for opening split nut when pencil is parted.

G. A pencil composed of two sections,a pointed section carrying a lead passage, a split nut anda rotatable friction joint, a barrel section to receive said friction joint, means for positioning said joint, means for closing said split nut over threaded rod means for rotating threaded rod in closed split nut, and means for disengaging said split nut with threaded rod.

7. A pair of pencil sections joined by a positioning rotatable friction joint, a lead passage, a split nut carried in point section, a nut closer .carried on a splined tube, said tube carrying a slidable threaded rod, a key on said rod engaging in said spline, a friction cup carrying said splined tube in the barrel section, forming a space for spare leads, means for retaining said spare leads in barrel section, and means for partly elevating said spare leads out of barrel section.

8. A pencil composed of two sections, a lead passage and an open split nut carrled in point section, means for closing said split nut over threaded rod carried in barrel section by joining said pencil sections, and means for actuating said threaded rod in vl5 closed threaded nut.

9. In combination, a pointed section and a barrel section, forming a-"pencll when joined, the point section carrying a lead plssage and :i split nut, a nut closer, a threaded rod, a friction cup, and a collar forming a 10 magazine' for spare leads in barrel sectlon, means for manually elevating said spare eacs out of magazine substantially as set HENRY W. LARSSON.

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