US1518008A - Pencil - Google Patents

Description

Patented Dec. 2, 1924.

UNITED STATES PATENT ortica.

ELMER S. SHIMER, 0F MILTON, PENNSYLVANIA.

PENCIL.

Application led .Tune 6,- 1921.

f ing and consequently are ideal for mechanical pencils.

This present invention consists of three main parts, namely, a tube, a spiral and a pin, all properly assembled and encased in an outer holder where they may be held in place by friction.

In the accompanying drawings Fig. 1 is a sectional view through my improved pencil with all parts assembled. Fig. 2 is a side view of the tube, Fig. 3 is a similar view of the spiral and Fig. 4 is a view of the pin.

A represents the spiral, one end being in the form of a solid tube, having a circumferential groove 2 a short distance back from the end and tapering from the groove to a thin edge at the end.

The numeral 3 indicates the pin with a turned up neck 4 at one end, as shown in Fig. 4.

The numeral 5 is the tube, see Fig. 2. rThis has a narrow slot 6 running longitudinally from the outside into the bore T. A shoulder 8 is formed near one end and from the shoulder the end of the tube gradually tapers to nothing.

The numeral 9 is the holder or body and while the other parts are of metal, this is preferably of hard rubber.

The parts are assembled by holding the turned up end 4 of the pin while the free end is inserted through the slot 6, in the tube, in the direction of the taper. lVhile still held in this position the spiral A is sleeved over the free. end of the pin and pushed on into the tube until the end of the spiral reaches the turned up end, whereupon it is turned, thus causing the pin to feed, the slot 6 confining its movement strictly to an endwise travel. Vith a small Serial No. 475,426.

die machine the thin end of the tube is pressed into the groove 2 thus permanently uniting the three parts, into a unit ready for introduction into the holder, where it is held frictionally, the endof the holder '1:

stopping against the shoulder and the tapers of the holder, tube and spiral member forming one general taper. The spinning of the end of the tube into the groove 2 confines all movement of the tube and spiral to a turning movement, all endwise movement of said parts being precluded. In like manner the pin moves straight and does not turn.

The lead is inserted through the end and is backed and fed by the pin and the lead is fed forward when requiredby grasping the tapering or protruding end 9 of the spiral between the finger and thumb of the left hand and by turning the holder and with it the tube with the right hand, to the right. To insert a new lead the holder is turned to. the left, and in the same way the lead may be pushed back if it is out too far. The lead holds its place in the bore of the spiral frictionally.

I claim As an article of manufacture, a mechanical pencil comprising a lead actuating pin having a neck or lug, a longitudinally bored lead-holding tube of uniform external diameter throughout its entire length except for a taper at one end and a recess or groove adjacent the taper, and in which tube the pin is slidably mounted, a helical slot n'iilled in the tube at the opposite end from the recess or groove in which the neck or lug of the pin has a slidable adjustment, a longitudinally slotted housing tube of uniform internal diameter in which the lead-holding 'f tube is inserted and rotatably supported throughout its length, a portion of the pin projecting into said longitudinal slot and adapted to be guided thereby, the end of said housing tube having a tapered edge adapted to be spun into the recess of said leadeholding tube for permanently engaging the two tubes, said housing tube being provided with an external shoulder and a casing functionally engaging the housing and abutting said shoulder'.

In testimony whereof I hereunto affix my signature.

ELMER S. SHIMER.

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