US3112561A

US3112561A - Method and apparatus for making pencil marking points

Info

Publication number: US3112561A
Application number: US9485A
Authority: US
Inventors: Solow Benjamin
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-05-17
Filing date: 1960-02-18
Publication date: 1963-12-03
Anticipated expiration: 1980-12-03

Description

B. SOLOW Dec. 3, 1963 METHOD AND APPARATUS FOR MAKING PENCIL MARKING POINTS 2 sheets-sheet 1 Original Filed May l?, 1955 101m f/JM//Y SOZOW BY auth H. m

INVEN ,4 rra/PNEX B. soLow 3,112,561 t METHOD AND APPARATUS FoR MAKING PENCIL MARKING POINTS ,Y

Original Filed May 17, 1955 2 Sheets-Sheet 2 Il!!! Il!!! III il Il 2 5 du a,

1N VEN TOR. ff/VJM/A/ faz 014/ BY ML N. w

3,112,561 METHD AND APPARATUS FR MAKING PENCIL MARKING PiNIS Benjamin Solow, 5743 Rhodes Ave.,

North Hollywood, Calif. riginal application May 17, 1955, Ser. No. 508,957, now Patent No. 2,942,577, dated .lune 23, 1960. Divided and this application Feb. 18, 1960, Ser. No. 9,485

2 Claims. (Cl. 29-420) rThis invention relates to novel pencil marking-points and to xa method yand apparatus for making such markingpoints.

For many years pencil manufacturers have sought a mechanical lead pencil that would provide a sharp point, which sharp point would not be dulled after the initial writing period.

A suggested solution to this problem is the magazine form of mechanical pencil, namely pencils in which a series of sharp points are contained in a magazine, and in which means are provided for ejecting worn points and substituting new ones therefor. A number of United States patents have been granted on such devices, such as Fornander Patent 499,191 issued June 6, el893; Goldsmith Patent 618,172 issued January 24, 1899, etc.

However, the magazine pencil has never proven commercially practicable. The salient reason for the failure of this pencil lies in the fact that it has not been possible to provide a sharpened pencil lead having adequate structural strength. Thus, the pencil leads are subjected to stresses and strains in manufacture and assembly, particularly during the magazine loading operation, in transport, and while positioned within the pencil, etc. causing the points to shatter, split, :or become dull. As it has not heretofore been possible to provide a pencil markingpoint having adequate strength, the magazine form of pencil has not been commercially exploited,

This invention has IasV `an object the provision of -a pencil marking-point for use in a magazine pencil, which marking-point possesses great structural strength.

A further object of the present invention is the provision of a method of manufacturing pencil markingpoints possessing great structural strength.

Another object of the present invention is the provision of apparatus for making pencil marking-points of great strength.

Still further objects will appear hereinafter.

For the purpose of illustrating the invention there is shown in the drawings forms which are presently preferred; it being understood, however, that this invention is not limited to. the precise arrangements and instrumentalities shown.

'Referring to lthe drawings, wherein like reference characters refer to like parts;

FIGURE l is a perspective view of one embodiment of the pencil marking-point of the present invention.

FIGURE 2 is a part elevation 'and part longitudinal sectional view of a split ltube magazine of the present invention showing a plurality of pencil marking-points nested together.

FIGURE 3 is :a fragmentary enlarged sectional View of a portion of FIGURE 2 showing the relationship of the pencil marking-points nested together.

FIGURE 3a is a vertical sectional View of Aa modified embodiment of the pencil marking-point of the present invention.

FIGURE 4 is a perspective View of an embodiment of a mold for forming the pencil marking points of the present invention.

LFIGURE 5 is a longitudinal sectional View of the sheet metal plate used to form the support collar for the pencil marking points of rthe present invention.

fil

3,112,561 Fatented Bec. 3, 1963 FIGURE 6 is a fragmentary sectional view through the sections of the mold with the mold sect-ions in operative alignment, and with a pencil marking-point formed therebetween.

FIGURE 7 is a diagrammatic sectional View of the punching-out stage in the manufacture of the pencil marking-points of the present invention.

Referring Ito fthe drawings, and initially to FIGURES l, 2 and 3 the pencil marking-point of the present invention is design-ated 1li. Marking-point 1li comprises a sheet metal tubular collar 12 and a pencil lead 14. Pencil leazd 14 has a sharp conical point 16 surrounded by an annular hat 17 at one end, and a cone-shaped cavity 13 at the other end, surrounded by `an annular at 19. The tubular collar 12 has au inwardly directed ange 21 which covers :a portion of flat 17. The cone-shaped cavity 18 is of a size sufficient to form 'a nest for the tip portion of the point 16 of la similarly shaped pencil lead 14 so that internesting 4or sheathing of a plurality of pencil points may be accomplished in vertical alignment within a split tube magazine 23 (see FQIGURES` 2 and 3). As seen particularly in yFIGURE 3, when the' marking-points are internested, llange 21 of each upper marking-point rests on the annular upper edge Z4 of the metal collar 12 of the next lower marking-point. There is a gap between point 16 of each up er marking-point and cavity 18 tof each lower marking-point. In this manner all longitudinal thrust is borne by the metal collar 12 and not by lead 14 when the marking-points are internested.

The metal tubular collar 12 serves as a shield protecting pencil lead 14 from shock, when fthe marking-point 1i) is grasped at its sides within the magazine 23. The internesting of point 16 of the pencil lead 14 of one marking-point 1d within the cone-shaped cavity 18 of the pencil lead 14 of another marking-point 1li leads to further structural strength Ias the points 16 are protected by the pencil lead 14 arid metal tubular collar 12 of the marking point within which the point 16 is received.

The method and apparatus for manufacturing the pencil marking-points of the present invention can be ascertained from an examination of 'FIGURES 4 through 7, wherein the manufacture of the pencil marking-point 1i) is illustrated.

One embodiment of the mold used in the present invention is diagnammatically illustrated in FIGURE 4. The mold designated generally as 5t? comprises an upper or cap section 52 and `a lower or bottom section 54. The

sections

52 and 54 are provided with respective mating conical knobs and cavities, so that when upper section 52 alignedly rests on the upper surface of lower section 54, each cavity 53 formed in lower section 54 received a mating conical knob 55 of upper section 52.

The cavity 53 in lower section 54 includes a downwardly directed cone-shaped recess 55 which forms the sharp conical point 116 of pencil lead 14, and a surrounding or contiguous plateau 57 on which flange 21 rests.

Conical knob 55 is smaller than the mouth of cavity 53 in lower section 54 and forms cone-shaped cavity 1S in pencil lead l1d. Surrounding conical knob 55 is a raised contiguous plateau 59 which forms hat l19 in pencil lead 14.

A sheet metal plate 6i? of thin sheet metal (see in particular, FIGURE 5) having annular flanges 612, which serves as a metallic liner (see FIGURE 6) is fitted over bottom section 54. As shown in FIGURE 6i, plate 60 covers the surface of bottom section 54, except for the cone-shaped recesses 56 and the plateaus 57.

The conventional components used in forming pencil leads, such as a plasticized mass of finely divided graphite, soot and yclay are placed in the space between the depending annular ange `62 and the cone-shaped recess 56 in each of the cavities 53 of bottom section 54. Sutilcient pencil lead component composition `is included so that when mold section 52 is placed over mold section '54, the pencil lead components till the cavity intermedi- `ate upper section 52 and lower section 54.

No claim is made to novel pencil lead compositions. Accordingly, conventional pencil lead compositions may be used. Straight Patent 2,388,447; Ferst Patent 2,355,- 639; Van Dusen Patent 2,566,753; Loy Patent 2,645,582, Maneval Patent 2,679,460 and Loy Patent 2,682,476 disclose various pencil lead compositions. The plasticized pencil lead composition shaped in the aforesaid manner may be dried within the mold and then tired at conventionally used Atiring conditions.

When the temperature of the mold has been returned to room temperature, upper section 52 is raised from lower section 54 and plate 60 carrying the hardened pencil marking-points is removed from lower section 54.

The plate is then positioned on a suitable multipunch Y Vpress 70 having a plurality of punches 72 (see FG- URE 7).

As shown in FIGURE 7 the pencil marking-points of lthe present invention `are cut away from plate 68 on the downward movement `of punch '72 (see Vtcp larrow in FIGURE 7 The cut-away pencil marking-points it) fall downwardly in the direction of the bottom arrow, vand are collected at the bottom of the press 76.

Preferably, the split tube magazine 23 is positioned inmediately below the openings in multipunch press 70 so that the movement of punch 72 pushes the cut-away pencil marking-points directly into the split tube magazine 23.

In the embodimentshown in FIGURE 3a, the pencil marking-point includes fa collar 12a and a pencil lead 14a. Collar 12a Iis crimped somewhat at 15, so that it partially projects into pencil lead 14a. The inward projection 15' of collar 12a serves as a thrust pillow and retention stop absorbing longitudinally directed stresses.

Pencil lead 14a is provided with a point 16a, and a cone-shaped cavity 18a surrounded by an annular flat 19a. The lower end of collar 12a is provided with `an inwardly directed flange 21a.

The present invention may be embodied in other specie forms without departing from the spirit or essential attributes thereof, and, accordingly, reference should be made to fthe appended claims, rather than to the foregoing speciiication as indicating lthe scope of the invention.

This application is a division `of my copending patent application Serial No. 508,957 filed May 17, 1955, now Patent No. 2,942,577.

I claim: Y

1. A method of making pencil making-points comprising the steps of placing la plate having ya depending annular ange terminating in an lannular radiallyY i11- Wardly directed flange over a mold having a blind cavity in a manner so that said flange is disposed within said cavity, said step being laccomplished in a manner so that the aperture defined by sm'd annular radially inwardly directed ange is in line with a conical portion at the bottom of said cavity, inserting plasticized pencil lead composition in said depending ange Iand the conical portion of said cavity in a manner so that the upper level of said composition is slightly below the plane fof said plate, forming a conical recess in the upper surface of said composition, hardening the composition at an elevated temperature to form a pencil-marking point embraced by said depending annular ange and having a conical portion projecting through the aperture defined by said radially inwardly directed flange and projecting itherebeyond, and cutting the metal plate along a plane generally proximating the outer surface `of said depending annular iiange to separate said annular ange from said plate.

2. A method in accordance with claim `1 wherein said plate -is provided with a plurality of said annular depending anges, said mold having 'a plurality of said cavities, and said plate being placed over said mold in a manner so that a separate one of said depending annular flanges extends into Ione of said cavities.

References (Jited in the tile of this patent UNITED STATES PATENTS 1,669,342 Mayol May 8, 1928 1,967,077 -Boegehold et al July 17, 1934 2,158,044 Haller May 9, 1939 2,302,045 Neumann Nov. 17, 1942 2,331,074 Jones Oct. 5, 1943 2,545,352 Gibbs Mar. 13, 1 2,572,438 Branson Oct. 23, 1951 2,841,863 Geisler July 8, 1958 2,888,742 Stumbock June 2, 1959 2,982,999 Stewart May 9, 1961

Claims

1. A METHOD OF MAKING PENCIL MARKING-POINTS COMPRISING THE STEPS OF PLACING A PLATE HAVING A DEPENDING ANNULAR FLANGE TERMINATING IN AN ANNULAR RADIALLY INWARDLY DIRECTED FLANGE OVER A MOLD HAVING A BLIND CAVITY IN A MANNER SO THAT SAID FLANGE IS DISPOSED WITHIN SAID CAVITY, SAID STEP BEING ACCOMPLISHED IN A MANNER SO THAT THE APERTURE DEFINED BY SAID ANNULAR RADIALLY INWARDLY DIRECTED FLANGE IS IN LINE WITH A CONICAL PORTION AT THE BOTTOM OF SAID CAVITY, INSERTING PLASTICIZED PENCIL LEAD COMPOSITION IN SAID DEPENDING FLANGE AND THE CONICAL PORTION OF SAID CAVITY IN A MANNER SO THAT THE UPPER LEVEL OF SAID COMPOSITION IS SLIGHTLY BELOW THE PLANE OF SAID PLATE, FORMING A CONICAL RECESS IN THE UPPER SURFACE OF SAID COMPOSITION, HARDENING THE COMPOSITION AT AN ELEVATED TEMPERATURE TO FORM A PENCIL-MARKING POINT EMBRACED BY SAID DEPENDING ANNULAR FLANGE AND HAVING A CONICAL PORTION PROJECTING THROUGH THE APERTURE DEFINED BY SAID RADIALLY INWARDLY DIRECTED FLANGE AND PROJECTING THEREBEYOND, AND CUTTING THE METAL PLATE ALONG A PLANE GENERALLY PROXIMATING THE OUTER SURFACE OF SAID DEPENDING ANNULAR FLANGE TO SEPARATE SAID ANNULAR FLANGE FROM SAID PLATE.