US2184528A - Mechanical pencil - Google Patents

Description

fill-72 Dec. 26, 1939.

L. J. MOST MECHANICAL PENC IL Filed larch 18, 1939 .Q arch Room Patented Dec. 26, 1939 Search Roon PATENT OFFICE MECHANICAL PENCIL Lucifer J. Most. Hudson County, N. J.

Application March 18, 1939, Serial No. 262,591

2 Claims.

My invention relates to a mechanical pencil, and is a modification of the structure as disclosed in my pending application, Serial No. 209,739, filed May 19, 1938.

The object of the invention is to provide a simple mechanism, formed of few moving parts, for propelling, retracting, expelling and automatically presenting a new lead to writing position.

Another object of the invention is to provide a mechanical pencil in which the lead itself is a part of the feed mechanism.

A still further object of the invention is to provide a mechanical pencil where the feeding can be done generally with the fingers holding the pencil in writing position.

In the appended drawing, forming part of this application, Figure 1 is a fragmentary elevation, partially in section.

Figure 2 is an enlarged cross-section on line 22, Figure 1.

Figure 3 is an enlarged cross-section on line 3-3, Figure 1.

Figure 4 is an enlarged cross-section on line 4-4, Figure 1.

Figure 5 is a section through the die and guiding tubes on line 5-5, Figure 4.

Figure 6 is a fragmentary elevation of a modified form of the pencil end, as shown in Figure 1, and

Figure 7 is a section on line 1l, Figure 6.

Referring to the drawing, I0 is the pencil shell or barrel formed with a hollow tip H, terminating in an opening l2, through which a lead may protrude. The tip H is provided with lateral cut-outs or openings l3 which are diametrically opposite, and through which the nut or die I4 is accessible for manipulation.

The die is maintained in proper register with the openings l3 by spaced tubular members I5 and I8 of angular cross-section, corresponding to the angular cross-section of the lead they are to engage, in this particular case the lead being square. The lower tube I5 is anchored in the tip II by a washer plug IS.

The die M has a circular recess I! which houses a portion of the tube l5, permitting the die to revolve freely relative to said tube. A similar recess I1 is formed on the opposite end of the die l4 to accommodate the lower end of the tubular member l8, the upper end of the tubular member l8 terminating with a hopper I9, which constitutes the body of the magazine for leads formed by the hopper with the barrel l0.

It will be seen that the die 14 positioned between the spaced tubular members l5 and I8 is free to revolve relatively to said tubular members, but prevented from moving longitudinally thereof, and is maintained by said tubular members in proper register with the lateral openings l3 in the barrel. To assure proper axial and angular alignment of the two tubular members l5 and I8, a washer 20 is provided between the tubular member 18 and the interior of the tip H.

The threaded portion 2| of the bore of the die lying between the recesses I1 is formed to engage the corners of the lead, which is presented thereto by the tube l8. This tube, due to its cross-section, prevents the lead from turning when the die I4 is revolved relatively thereto, and as the lead progresses through the die it will enter the lower tubular member l5, which aligns with the tube l8; as the lead progresses through the tube it can pass through the opening l2 in the tip H. To prevent a lead section 22 passing beyond the die H from dropping out from the tubular member IS, the lower end of the tube or of the tip is made to frictionally engage the lead therein, and the advancing of that section of the lead, which remains in the tube I5, is obtained through the succeeding lead which passes the die l4 to enter the tube l5.

The position of the die I 4 being such that it lies in proximity of the fingers engaging the pencil in writing position, the manipulation of the lead in the pencil, therefore, can be done by the fingers while in that position.

In the modified form shown in Figures 6 and 7, the shoulders of the lateral apertures 13' are rounded up inwardly to provide a better access to the die M by flattening and rounding oflf the shoulders of the lateral openings I3.

I claim:

1. In a mechanical pencil, a barrel having a lead outlet, a pair of aligning spaced tubular members of angular cross-section fixed in the barrel in proximity of the outlet and aligning therewith, a threaded die positioned between the tubular members and having annular recesses accommodating the proximate ends of the tubular members, so that the said die is free to revolve relatively to said members, but prevented from moving longitudinally, said barrel having lateral openings giving access for the manipulation of the die, and a hopper rising from the tubular member above the die forming with the barrel the magazine for leads.

2. In a mechanical pencil, a barrel terminating with a tip, a pair of spaced aligning tubular members of angular cross-section located in said tip and co-axial therewith, a threaded die positioned between the tubular members co-axial therewith and having an annular recess accommodating the proximate ends of the tubular members so that this said die is free to revolve relatively to said tubular members, but prevented from longitudinal movement thereof, said tip having means whereby access may be had to said die from the lateral side of said tip, and a hopper forming part of the upper tubular member in the tip, and engaging the barrel to a lead magazine.

LUCIFER J. MOST.

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