US588867A - Pencil - Google Patents
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- Publication number
- US588867A US588867A US588867DA US588867A US 588867 A US588867 A US 588867A US 588867D A US588867D A US 588867DA US 588867 A US588867 A US 588867A
- Authority
- US
- United States
- Prior art keywords
- graphite
- core
- filling
- pencil
- softer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 24
- 229910002804 graphite Inorganic materials 0.000 description 24
- 239000010439 graphite Substances 0.000 description 22
- 239000000203 mixture Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 16
- 239000011248 coating agent Substances 0.000 description 14
- 238000000576 coating method Methods 0.000 description 14
- 210000004940 Nucleus Anatomy 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 230000001464 adherent Effects 0.000 description 4
- 230000002093 peripheral Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
- B43K19/02—Pencils with graphite; Coloured pencils
Description
G. H. KNIGHT.
PENCIL.
No. 588,867. Patented Aug. 24,1897.
d 111V e'ntor:
. UNITED STATES PATENT OFFICE.
GEoRGE HENRY KNIGHT, OF- LYNN, MASSAcHUsETTs.
PENCIL.
SPECIFICATION forming part of Letters Patent N 0. 588,867, dated August 24, 1897. Application filed. May '7, 1897. Serial No. 635,563. (No model.)
'10 all whom it may concern:
Be it known that I, GEORGE HENRY KNIGHT, a citizen of the United States, residing at Lynn, in the county of Essex and State of Massachusetts, have invented a new and useful Improvement in Pencils, of which the following is a specification.
My invention is a device for a point-maintaining or self-sharpening pencil or crayon.
In this specification graphite or graphite composition may signify any dry solid used for marking purposes which is obtainable of several grades of hardness.
)Vhile applicable to caseless pencils crayons) and available with any suitable marking material, my invention is more especially designedfor, and is here described as, an improvement in black lead-pencils, so called, whose lead or filling is of a graphite composition. My improvement relates wholly to the filling.
My improved filling consists of a slender rod or filament (preferably of graphite or a preparation thereof) which forms the core, center, or nucleus to a surrounding sheath, body, or coating of like but softer material, or to two or more such successively softer concentric layers or coatings. Being applied in a viscous condition said coatings on solidifying unite with the core and with one another to form the closely-adherent mass of soft exterior and relatively hard central portion which constitutes my composite filling.
My invention is illustrated to a greatly-enlarged scale in the accompanying drawings.
Figure Irepresents a core or center. Fig. II represents a completed filling of the simplest binary) form. Fig. III shows the finished pencil, and Fig. IV the same pointed for use. Fig. V represents a multiplex filling, and Fig. VI the same incased. Figs. VII and VIII are cross-sections of the pencils shown at Figs. IV and VI. Figs. IX, X, and XI show a modified construction to a greatlyenlarged scale.
The simplest (binary) form of my filling is seen in Figs. II, III, IV, and VII, in which a core, center, or nucleus at is shown combined with a closelyadherent encircling and supporting shell, sleeve, or coating Z), of softer graphite, which when solidified forms with said core a a composite but solid rod. Instead of being used in this form directly-as a filling the rod a b may receive an added coating 0, Figs. V, VI, and VIII, (or a series ofsuch coatings,) so as to form a multiplex filling. No coating is applied until solidification of the interior portions, and for each addition a softer marking graphite is selected and is applied in a viscous condition. Such application may be made by immersion of the core or solid nucleus in the viscous or semiliquid coating material. Inclosure may take place in the stock or casing 02 before the peripheral or last applied coating of the core has fully solidified. For manufacture of fillings with very slender cores grooved shell partings 12% b, (shown in Fig. IX,) or Z9 00 11 (shown in Fig. X,) or 19% Z), (shown in Fig. XL) being coated with viscous graphite, the core While plastic is placed in groove to and the parts closed together. A still different mode of manufacture may consist in treating the peripheral portions with glycerin or other softoning agent, leaving the hard central portion intact. Cutting into pencil lengths may take place at any convenient stageof the process.
Iclaim herein as new and of my invention- 1. As a new and useful article of manufacture; the point-maintaining pencil comprising a central rod or core of hard marking material and one or more concentric sleeves of successivelysofter marking material in which the rod or core is incased substantially as set forth.
2. A pencil-filling which consists of the combination of a central graphite core a,with an inclosing shell or coating 1), of like but softer material; for the purpose set forth.
3. A pencil-filling composed of the combination of a graphite center a, and the closelyadherent su pportin g-sleeve b, of softer graphite composition; substantially as described and for the purpose set forth.
4. In the described combination; a central core a, of marking material and one or more tubular closely-adherin g coatings b, c, of like, but successively softer material, as set forth.
5. The combination with a suitable casing; bular layers or coatings Z), a, of successively of the composite filling composed of a graphite softer graphite compositions; for the purpose center Within one or more adherent tubes of explained.
a softer graphite composition. GEORGE HENRY KNIGHT.
(3. The described combination with a casing lVitnesses:
d, of a filling, which consists of the graphite M. E. KNIGHT,
core or center (L, and a series of adherent, tu- CHARLES \V. GEER.
Publications (1)
Publication Number | Publication Date |
---|---|
US588867A true US588867A (en) | 1897-08-24 |
Family
ID=2657532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US588867D Expired - Lifetime US588867A (en) | Pencil |
Country Status (1)
Country | Link |
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US (1) | US588867A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5340226A (en) * | 1993-02-22 | 1994-08-23 | Schwan-Stabilo Schwanhausser Gmbh & Co. | Process for the production of a pencil stick, a stick produced by the process and a pencil having such a stick |
US20020069649A1 (en) * | 2000-12-08 | 2002-06-13 | Ardais Corporation | Container for cryopreserved material |
-
0
- US US588867D patent/US588867A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5340226A (en) * | 1993-02-22 | 1994-08-23 | Schwan-Stabilo Schwanhausser Gmbh & Co. | Process for the production of a pencil stick, a stick produced by the process and a pencil having such a stick |
US20020069649A1 (en) * | 2000-12-08 | 2002-06-13 | Ardais Corporation | Container for cryopreserved material |
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