US1679382A - Pencil - Google Patents

Description

Aug. 7, 1928.

N. P. SJOBRING PENCIL Filed Sept. 11. 1924 tion.

Patented Aug.v 7, 1928.

PATENT OFFICE.

NELS IP. SJOBRING, 0F MILWAUKEE, WISCONSIN.

PENCIL.

Application led September 11, 1924. Serial No. 737,018.

This invention relates `to a pencil, and particularly to thattypc of pencil wherein a lead is ada'ptcd to be fed forward through the pencil point as consumed.

It is an object of this invention to provide a pencil shell and lead guide formed from one piece of sheet metal drawn or formed into the desired shape.

It is also an object of this invention to provide a lead advancing slide having a knob projecting above the surface of the pencil shell for manual movement thereof.

It is a provide Va mechanical pencil having an integral shell and lead guide with a conical point, together with means for applying increased fiiction to the `lead at the point.

It is another object of this invention to provide a simplemechanical pencil and to eliminate complicated feeding mechanisms, thereby providing -a mechanical pencil of inexpensive construction.

Other and further important objects of this inventionv will be apparent from the -disclosures inthe drawings and specifica- The invention (in a preferred form) is illustrated on the drawings and hereinafter more fully described.

On the drawings: Y

Figure 1 is a plan .view of a double ended pencil embodying one form of the device of this invention.

Figure 2 is an enlarged view thereof partly in section oli-the line 2--2 of Figure 1.

Figure 3 is a plan view of another form of the device of thisinvention.

Figure 4 is an enlarged view thereof partly in section on the line 4-4-of Figure 3.

Figure 5 is an enlarged cross section on the line 5-5 of Figure l.

Figure 6 isal cross section on the line `6---6 of Figure 4. E

Figure A7 is a cross section on the line If-7 of Figure 4.

Figure 8 is an enlarged detail section illustrating a modified cap structure. Y

As shown on the drawings;

Y The straight tubular shell Amodification is drawn or otherwise form from sheet metal, a central lead guide 11 being formed integral therewith with spaced reentrant portions 12 10 of either connecting the tube further object of this invention to.

slide has a shank 17 and guide to form a passageway for the lead propelling mechanism. As the entire structure as outlined above is made from a flat stri of sheet metal, the resulting joint may entrant portions, in which case the joint is left open to give a spring gripping effect to the lead guide, this type of joint being indicated by the numeral 14 in Figure 6. A lead propelling slide 15 fits the lead guide 11 to push the lead 16 out as needed. The projecting through the space between the re-entrantV members connecting the shell and lead guide and terminating in a knob or button 18 above the surface of the shell for manual operation of the slide. The construction of the cylindrical part of the shell and lead guide is the saine in both illustrated forms of the device of this invention.

flhe double ended pencil of Figures 1 and 2 involves separate Vconical caps 20 screwed onto the shell 10. The lead guide 11 is carried to the tip of the conical caps and is swaged to a taper adapted to be compressed by screwing on the conical ends to cause the guide 11- to grip the lead. To facilitate contraction of the guide it is slotted as at 21 for -a short distance from the end, if the shell is formed with the joint 13 on the exterior thereof instead of on the guide. The

'reentrant members 12 are carried forward from the end of the shell and tapered off to iit within the caps. It will be evident that j 4:with this construction slacking olf the-` caps.

20loosens the grip of the guide on thelead and allows projection thereof.

The single ended pencil of Figures 3 and 4 is provided with 23 at one end.' The other end 24 is drawn down to a conical point, the lead guide, as in the previous case, extending to the tip of the cone. A split spring bushing 25 is in-- serted around the end of the lead guide and inside the conical shell to resiliently contract ed the lead guide at the tip to provide suiiicient friction to hold thelead during use.

In Figure 8 I have shown a construction wherein a conical or tip cap 26' has a cylinan eraser 22 and holder drical portion 27 engaged inside the shell having a springing frictional engagement therewith. The outer end 28 of said tip frictionally engages the end of the tube to hold the lead gripped therein.

It will be apparent from the foregoing description that this invention provides a pencil wherein the lead is manually propelled and wherein it is resiliently gripped while the pencil is in use. The pencil is as simple as possible in construction-and correspondingly economical in manufacture, and there are no mechanical parts subject to damage.

I am aware that numerous details of construction may ybe varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the atent granted otherwise than necessitated y the prior art.

I claim as my invention:

In a manually operated encil, a sheet metal shell, an apertured conical end enclosing means longitudinally adjustable thereon, spaced arallel reentrant portions of the shell defining a longitudinal slot therein and a split lead-guiding tube, the said rccntrant portions extending beyond the shell and through the aperture in the conical end cnclosing means as a split tube having tapered upstanding supporting tins within the enclosing means, and means slidable in the tube for projecting a lead therefrom.

In testimony whereof I have hereunto subscribed my name.

NELS P. SJ OBRIN G.

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