US1621990A - Automatic pencil - Google Patents

Description

Mamh 22 W27 mzwm L. HI. LRPPERT ET AL AUTOMATIC PENCIL Filed Nov. 13, 1924 Patented Mar. 22, 1927.

UNITED STATES v 1,621,990 PATENT OFFICE.

LEO H. LIPPI IR'I, OF BROOKINGS, SOUTH DAKOTA, AND RAGNVALD IBERGESON, OF

CHICAGO,

ILLINOIS.

AUTOMATIC PENCIL.

Application filed November 13, 1924. Serial No. 749,699.

This invention relates to stationery and more particularly to magazine pencils.

The object of the invention is to provide a pencil of this character so constructed that the lead will be automatically fed to the point when necessary. Another object is toprovide apencil oi this character the lead containing chamber of which will hold a number of leads which will feed to the lower portion through an opening just large enough for a single lead. Another object is to so construct a pencil of this character as to dispense with constant handling of leads to effect saving in tune and prevent soiling of the fingers.

With the foregoing and other Ol) ]00ts ll1 view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and m the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing- F from the spirit of the invention.

In the accompanying drawings Figure 1 represents a longitudinal section of a pencil constructed in accordance with this invention;

Figure 2 is an enlarged detail longltudmal section taken in a plane at right angles to section shown in Fig. 1.

Figure 3 is a transverse section taken on the line 3-3 of Fig. 1;

Figure 4 is a similar View taken on the line 44 of Fig. 1;

Figure 5 is' a transverse section taken on the line 55 of Fig. 1; and

F ig. 6 is a similar view taken on the line 6-6 of Fig. 1.

In the embodiment illustrated a hollow casing 1 is shown having a tapered front member 2 detachably mounted therein and held by means presently to be described.

The rear end of the casing 1 is equipped with a removable cap 3 which fits over the offset upper end 6 of a magazine chamber 6 which carries a pencil rubber or eraser 5 mounted in a clamping member 4. This member 4 is made substantially U-shaped with spring arms 4 having inturned prongs 4" designed 'to bite into the eraser 5 and hold it, the member 4 fitting snugly in the house magazine or tubular chamber 6 fits in the casing 1 at its rear end and extends to a point about midway the length thereof. The tubular magazine 6 has a reduced tubular extension 7 connected with the inner end of the member 6 by a hopper-shaped'connection 8 which is designed to direct the leads which are stored in the chamber 6 into the tubular extension 7 as will-"be hereinafter more fully described. The reduced tubular extension 7 of the magazine is made polygonal in cross section being here shown square, see Fig. 5, and is of a size to receive a single lead which drops from the chamber 6 into the tube and passes down through said tube into the hollow point 2 in which it is held by friction. The lower end of the tubular member 7 is externally threaded to engage a correspondingly threaded portion of the point 2 as is shown clearly in Fig. 1.

The lead feed 'tube 7 is'longitudinally slotted at diametrically opposite sides as shown at 9 and the outer faces of the member 7 adjacent the upper ends of the slots 9 are inclined gradually outward from the ends of said slots as is shown clearly at 10 in Fig. 2 and on which are designed to ride spring fingers 11 carried by a nut 12 which has threaded engagementwith the interior of the casing 1 so that when the magazine 6 and its extension 7 are rotated the nut 12 will be moved longitudinally according to the direction in which these members are turned. When the casing is turned so as to cause the nut 12 to move downwardly the fingers 11.. which have substantially rightangular inwardlyextending points 11 will be moved into the slots 9 and said points 11 will engage the lead in the member 7 and feed it downward the desired length causing it to pass out through point 2, the bore 2- of which registers with the tube 7.

In the use of this pencil the parts being assembled as shown in Figs. 1 and 2 with the magazine 6 filled with leads, not shown, one of the leadshaving dropped into the feeding tube 7 and extended through thepoint 2, the pencil is ready for use. When the lead in use wears short and it is desired to feed it further ,down the casing 1 is held in one hand and the cap 3 is turned which causes the magazine 6 to turn with it. This turning of the magazine causes the nut 12 to move forward in the casing 1 and when it reaches a predetermined point the spring fingers 11 enter the grooves 9 and the points 11 therec of engage the lead to be fed and force it down out through the point until it reaches the desired extension. After the nut 12 has been fed downward to its extreme lower limit the lead in use will pass out through the bore 2. of point 2. The casing or rather the magazine 6 is then rotated in the opposite direction which causes the nut 12 to rise upwardly in the casing 1 until it reaches the point shown in Fig. 2 with the fingers 11 passed out of the slots 9. Another lead will then drop from the magazine 6 into the tube 7 and the pencil will again be ready for use.

It Will thus be seen that after the magazine 6 has been filled with lead the only operation necessary to actuate the feed is to turn the magazine 6 through. the cap 3 and housing 6 in the manner above described.

We claim A pencil of the character described, including a tubular body portion, said body portion havin internal threads disposed throughout su stantially one-half of the length of the body portion, a tubular ma a- 25 zine having an enlarged upper portion or mam containing lengths of lead and having a lower restricted portion, and a tapered funnel-shaped portion connecting the enlarged portion and restricted portion to feed lead to the restricted ortion, said restricted portion having its side walls cut away at opposite sides providing slots and having inclined surfaces adjacent to the upper edges thereof, a nut slidable on the restricted portion,

spring fingers carried by the nut and adapted to extend into the slots to grip a length of lead therebetween to hold and feed the lead towards one end of the body portion,

natures.

LEO H. LIPPERT. RAGNVALD BERGESON.

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