US3779652A - Automatic pencil for drawing a line - Google Patents

Automatic pencil for drawing a line Download PDF

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Publication number
US3779652A
US3779652A US00169369A US3779652DA US3779652A US 3779652 A US3779652 A US 3779652A US 00169369 A US00169369 A US 00169369A US 3779652D A US3779652D A US 3779652DA US 3779652 A US3779652 A US 3779652A
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US
United States
Prior art keywords
lead
casing
open end
gripping means
motor
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
Application number
US00169369A
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English (en)
Inventor
S Kunitoku
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NISHITETSU SANGYO CO Ltd
Original Assignee
NISHITETSU SANGYO CO Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NISHITETSU SANGYO CO Ltd filed Critical NISHITETSU SANGYO CO Ltd
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Publication of US3779652A publication Critical patent/US3779652A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K29/00—Combinations of writing implements with other articles
    • B43K29/06—Combinations of writing implements with other articles with sharpening devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B43K21/006—Pencil-barrels

Definitions

  • the former two methods have the fault that since the tip of the lead gradually becomes round as it wears away, it is necessary for the lead to be sharpened many times. And the latter method has the fault that thin lead under 0.3mm in diameter is apt to snap and a dark line cannot be drawn, even though it does not require sharpening.
  • My invention comprises means for drawing a fine clear line without sharpening the lead as long as the lead remains.
  • FIG. 1 is a schematic side view of the tip of the lead, illustrating the theory of the automatic pencil for drawing a line;
  • FIG. 2 is a vertical section taken along the line II of FIG. 1;
  • FIG. 3-9 are axial sectional views showing various embodiments of a device for holding a lead or turning it;
  • FIGS. 10-14 are transverse sections taken along the line 11-11 in FIG. 3, the line Ill-III IN FIG. 4, the line IVIV in FIG. 5, the line V-V in FIG. 7, the line VI-VI in FIG. 9, respectively.
  • FIGS. l-l4 the illustrated embodiments of the automatic pencil for drawing a line according to this invention will now be described.
  • the automatic pencil in the present invention comprises a rod 2 for advancing a lead in a holder 1, which rod is rotated by a small motor 3 at one end of the pencil, e.g., a micromotor or a micro-airmotor.
  • the tip (a) of the lead 5 wears to form a conical shape.
  • the conical-shaped tip (a) of the lead 5 continues to wear away due to abrasion on the paper 6, and the conical shape is maintained until the lead 5 is used up.
  • a line having no width ought to be drawn just under the axis of the conical-shaped top of the lead 5 by the base (p-q) of the tip (a) of the lead 5, if the lead 5 is hard and the paper 6 is quite hard and smooth. However since the surface of the paper is uneven, the line has a certain width.
  • the line is not more than 0.4 mm wide when a lead 2 mm in diameter is used, and the line is not more than 0.2 mm wide in case of a lead 1 mm in diameter. (See FIG. 1 and FIG. 2; t, and t in FIG. 2 represent the width of the lines on the paper 6.)
  • a fine dark vantage that a dark line may be drawn with very light pressure of the lead 5 against the paper 6 and, in addition, the width of the line can be freely controlled by pressure of the lead 5 against the paper 6, or the quality of the paper.
  • the first embodiment (illustrated in FIGS. I-3 and FIG. 10)
  • a holder 1 consists of two telescopic sec tions, with the left section housing a narrow tube 8 and the right section housing a micromotor 3.
  • the rod 2 which is an extension of the drive shaft of the micromotor and carries a chuck 4 holding the inner end of the lead.
  • the microairmotor 3 mounted rotates the rod 2 in the center of the holder 1, thus rotating the lead 5 so that the tip of the lead 5, as shown in FIG. 1, becomes conical with a vertical angle of -90, if the holder is inclined at 3045 and the tip of the lead 5 rotates in contact with the surface of a rough paper e.g.
  • the second embodiment (illustrated in FIG. 4 and FIG. 1 1
  • a micromotor 3 is telescopically and axially inserted in the holder 1.
  • One end of a rod 2 is connected to the drive shaft 9 of the micromotor by a coupling 10, and the end of a lead 5 is seated in a chuck 4 at the other end of the rod 2.
  • the micromotor 3 when the micromotor 3 is pushed to the left the lead 5 is projected from the narrow tube 8, since it is pushed out by the rod 2 connected to the micromotor 3.
  • the third embodiment (illustrated in FIG. 5 and FIG. 12)
  • a micromotor 3 is mounted near one end of a holder 1, a chuck 40 at one end of a rod 2 is located in the narrow tube 8a near the tip of the holder 1, and in this embodiment, the part of a lead 5 is inserted in the rod 12 and is gripped by the chuck 4a.
  • the tube 8a is slidable in the casing 1 against the resistance of the spring.
  • the fourth embodiment (illustrated in FIG. 6)
  • a push rod 14 one end of which projects from the end of the holder 1, is connected to a micromotor 3 in the holder 1.
  • the push rod 14 is pushed to the left and the micromotor 3 advances in the direction of the narrow tube 8, the lead 5 is released by the chuck 4b and projects from the narrow tube.
  • the fifth embodiment (illustrated in FIG. 7 and FIG. 13)
  • the end of a rod 2 which has a chuck 4 at one end for holding the lead, is inserted into a first tube 11 in which it is held by the second chuck 12.
  • the end of said tube 11 is connected to the drive shaft 9 of a small motor 3 through a shaft coupling l0, and the end of a lead 5, which projects through a narrow tube 8 gripped by the chuck 4.
  • the micromotor when the micromotor is pushed to the left, the rod 2 is released by the second chuck and the lead is pushed by the rod 2 to project it from the narrow tube 8.
  • the sixth embodiment (illustrated in FIG. 9 and FIG. 14)
  • a micromotor 3 mounted in a holder 1 is connected to a pressure tube 13 slidably mounted in the end of the holder 1.
  • a rod 2 is connected directly to the drive shaft of the motor, and the end of a lead 5 in the narrow tube 8 is gripped in the chuck 4 at the tip of the rod 2.
  • the pressure tube 13 is pushed to the left, the lead 5 is projected through the narrow tube 8 by the rod 2.
  • the seventh embodiment (illustrated in FIG. 8)
  • a micromotor 3 is mounted at the end of a holder 1 and the lead 5 is gripped by a chuck 4 at the end of a rod 2 extending from drive shaft of the micromotor.
  • a narrow tube 8, thepart A, the part B and the part C are fixed to each other. Therefore, when the narrow tube 8 is pulled outwardly, all three of the parts connected to it, A, B, and C move to the left together with it. After that, when the narrow tube 8 is returned to its original position, a desired portion of the lead 5 projects outwardly through the narrow tube 8.
  • An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatbly mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, both said motor and gripping means being longitudinally sladable in said casing. slidable 2.
  • An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatably mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, said casing comprising two parts, one of which is slidable with respect to the other, and said motor being fixed to one of said parts.
  • An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatably mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, said motor being mounted to slide in said casing and said gripping means being a spring operated chuck mounted to be opened when said motor slides in one direction from a normal rest position and closed when said motor slides in the other direction and while it remains in said rest position, and said motor carrying abutment means positioned to advance said lead when said motor is moved in said one direction.
US00169369A 1970-08-08 1971-08-05 Automatic pencil for drawing a line Expired - Lifetime US3779652A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6955370 1970-08-08

Publications (1)

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US3779652A true US3779652A (en) 1973-12-18

Family

ID=13406023

Family Applications (1)

Application Number Title Priority Date Filing Date
US00169369A Expired - Lifetime US3779652A (en) 1970-08-08 1971-08-05 Automatic pencil for drawing a line

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US (1) US3779652A (de)
DE (1) DE2139589A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5015049A (en) * 1986-11-04 1991-05-14 Kaiser Optical Systems Method of forming holographic optical elements free of secondary fringes
US5208987A (en) * 1992-05-12 1993-05-11 Hart Enterprises, Inc. Marking device with vibrating yieldable writing tip
JP2015024569A (ja) * 2013-07-26 2015-02-05 ぺんてる株式会社 軸筒の連結構造
US20160207346A1 (en) * 2013-03-15 2016-07-21 Angelo P. Verdelli, Jr. Writing implement holder
USD813311S1 (en) * 2016-06-16 2018-03-20 Dong-A Teaching Materials Co., Ltd. Highlighter
USD863432S1 (en) * 2018-03-11 2019-10-15 Tsung-Hsien Yu Writing instrument
USD936739S1 (en) * 2019-08-22 2021-11-23 Mitsubishi Pencil Company, Limited Pen
USD953200S1 (en) * 2019-08-22 2022-05-31 Mitsubishi Pencilcompany, Limited Pen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE186432C (de) *
US2480740A (en) * 1947-04-08 1949-08-30 Ibm Pencil holder with means to rotate the pencil with respect to the holder incident to use thereof
FR1394248A (fr) * 1964-02-20 1965-04-02 Instrument traceur manuel, en particulier crayon ou plume, à pointe vibrante
US3514211A (en) * 1968-03-12 1970-05-26 Yasuyuki Hashimoto Pencil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE186432C (de) *
US2480740A (en) * 1947-04-08 1949-08-30 Ibm Pencil holder with means to rotate the pencil with respect to the holder incident to use thereof
FR1394248A (fr) * 1964-02-20 1965-04-02 Instrument traceur manuel, en particulier crayon ou plume, à pointe vibrante
US3514211A (en) * 1968-03-12 1970-05-26 Yasuyuki Hashimoto Pencil

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5015049A (en) * 1986-11-04 1991-05-14 Kaiser Optical Systems Method of forming holographic optical elements free of secondary fringes
US5208987A (en) * 1992-05-12 1993-05-11 Hart Enterprises, Inc. Marking device with vibrating yieldable writing tip
US20160207346A1 (en) * 2013-03-15 2016-07-21 Angelo P. Verdelli, Jr. Writing implement holder
US10207534B2 (en) * 2013-03-15 2019-02-19 Angelo P. Verdelli, Jr. Writing implement holder
JP2015024569A (ja) * 2013-07-26 2015-02-05 ぺんてる株式会社 軸筒の連結構造
USD813311S1 (en) * 2016-06-16 2018-03-20 Dong-A Teaching Materials Co., Ltd. Highlighter
USD863432S1 (en) * 2018-03-11 2019-10-15 Tsung-Hsien Yu Writing instrument
USD936739S1 (en) * 2019-08-22 2021-11-23 Mitsubishi Pencil Company, Limited Pen
USD953200S1 (en) * 2019-08-22 2022-05-31 Mitsubishi Pencilcompany, Limited Pen

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Publication number Publication date
DE2139589A1 (de) 1972-05-25

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