EP0082594A2 - Bleistift mit regulierbarer Mine - Google Patents

Bleistift mit regulierbarer Mine Download PDF

Info

Publication number
EP0082594A2
EP0082594A2 EP82306005A EP82306005A EP0082594A2 EP 0082594 A2 EP0082594 A2 EP 0082594A2 EP 82306005 A EP82306005 A EP 82306005A EP 82306005 A EP82306005 A EP 82306005A EP 0082594 A2 EP0082594 A2 EP 0082594A2
Authority
EP
European Patent Office
Prior art keywords
writing
cylinder
lead
chuck
pencil
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.)
Withdrawn
Application number
EP82306005A
Other languages
English (en)
French (fr)
Other versions
EP0082594A3 (de
Inventor
Katsumi Outsuka
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.)
Venice Co Ltd
Toplan Manufacturing Inc
Original Assignee
Venice Co Ltd
Toplan Manufacturing Inc
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 Venice Co Ltd, Toplan Manufacturing Inc filed Critical Venice Co Ltd
Publication of EP0082594A2 publication Critical patent/EP0082594A2/de
Publication of EP0082594A3 publication Critical patent/EP0082594A3/de
Withdrawn legal-status Critical Current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
    • B43K21/00—Propelling pencils
    • B43K21/02—Writing-core feeding mechanisms
    • B43K21/22—Writing-cores gripping means, e.g. chucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B43K21/02—Writing-core feeding mechanisms
    • B43K21/027—Writing-core feeding mechanisms with sliding tubelike writing-core guide
    • B43K21/033—Writing-core feeding mechanisms with sliding tubelike writing-core guide with automatic feed by pressure during use of pencil

Definitions

  • This invention relates to an improved propelling pencil. More particularly, the invention relates to an improved propelling pencil in which the lead can be projected or exposed to a predetermined amount only by applying writing pressure to a pencil cylinder, when the lead is worn out or broken.
  • an object of the preferred form of the invention is to provide an improved propelling pencil which is convenient for use and which is free from breaking of the lead due to excessive exposure of the lead from the pencil body. Further objects of the invention will be apparent from the explanation hereinafter.
  • a propelling pencil characterised in that when the writing cylinder end is pushed onto sheet or the desk, the writing end rotates, while a chuck for a lead is operated due to the rotation of the writing end and opens to allow the lead to fall freely to the end of the writing end, the chuck grasps the lead when a pencil cylinder rises, and descends due to returning rotation of the writing cylinder so as to maintain a predetermined amount of projected portion of the lead.
  • a propelling pencil including a chuck for holding the lead which is operated by downwards pushing of the body of the pencil so that the point is pushed to the paper to effect projection of a fresh length of lead from the pencil for writing.
  • a pencil cylinder 1 is proviaed at its top with an eraser 2, and the cylinder is fixed by a screw 6 to a metal piece 7.
  • a store 4 is defined, from which extends a lead guide 3.
  • the bottom 5 of the lead guide 3 acts a stopper 5 for a chuck 25.
  • Cylinder surfaces 8 and 9 inside the metal piece 7 are separated by a section of oblique surfaces 10, which form helical grooves 11, and the surface 8 has part of piece 7 defining vertical grooves 12.
  • a writing cylinder 13 fits in metal piece 7 and is provided with followers 14 which slide within said grooves 11.
  • the cylinder 13 is provided'at its upper part with saw-set cam surfaces 15, and at its lower part with a projected taper 16 for opening the chuck, and a lead protective passage 17.
  • the inside 18 of the cylinder 13 is slidably provided with a chuck cylinder 19.
  • a chuck taper 23 is provided at the bottom of the chuck cylinder 19, while a spring opening 24 is provided at its upper part.
  • a chuck 25 which can be opened at two or three positions, has a recessed taper 25a at its bottom surface.
  • the chuck 25 is urged constantly in the upward direction by a spring 27 provided between a collar 26 and chuck cylinder 19.
  • a writing spring 28 urges the writing cylinder 13 downward via oblique surfaces 20 of the chuck cylinder 19.
  • reference 29 indicates a lead and 30 is paper on which writing is to take place.
  • the lead 29 is stored in lead store 4.
  • the lead 29 falls to the chuck 25 through the guide 3 due to the action of gravity.
  • the cylinder 1 is pressed strongly to the paper 30, the metal piece 7 descends, and the writing cylinder 13 is rotated by means of the action of followers 14 following the helical grooves 11.
  • the saw-set cam surfaces 15 are also roated, since the oblique surfaces 20 which engage with the surfaces 15, are prevented from rotating by virtue of the engagements of keys 22 in grooves 12, the surfaces 20 and the cylinder 19 ascend upward relative to cylinder 13.
  • the chuck cylinder 19 rises relative to the cylinder 13 to the extent of the thread of the saw-set cam surface 15.
  • the stopper 5 engages the upper surface of the chuck 25 and moves the chuck downwards with the result that the chuck 25 is opened and the lead falls through the chuck and the bottom of the lead 29 reaches the sheet 30, as shown in fig. 3.
  • the cylinder 1 is pushed upward due to the reactive force of the writing spring 28, but initially the lead 29 remains in contact with the sheet 30. If the force is further relaxed, the stoper 5 moves clear of the chuck 25 permitting it to rise due to the action of the chuck spring 27 until the chuck 25 chucks the lead 29, and, the lead 28 and the chuck rise together until the chucking force balances the lead weight and, thus the chuck chucks the lead firmly, and reaches the state shown in fig. 2.
  • the followers 14 engage the grooves 11 provided in the metal piece 7, and the writing cylinder 13 starts to rotate in a direction opposite to that in which it rotated when the cylinder 1 was pushed downwards. Consequently, the saw-set cam surfaces 15 of the cylinder 13 turn with a position permitting the oblique surfaces 2e and hence the cylinder to move downwards relative to cylinder 13, and the chuck 25 and the lead 20 descend.
  • the force of the writing spring 28 is stopped by the contact between the lead 29 and the sheet 30.
  • the pencil cylinder 1 is pushed upwards, the writing cylinder 13 rises while rotating, and reaches the state shown in Fig. 1 in which the lead projects from the pencil by a predetermined amount, ready for writing.
  • Writing work is effected with the pencil in this state. Writing can take place as long as the force of writing is below that of the pressure of writing spring 28. If the writing pressure becomes excessive, the lead 29 enters into the lead protective passage 17, and if the writing pressure is reduced, the lead 29 returns its original position. In this way, the lead is prevented from being broken.
  • the state snown in Fig. 3 is independent or the projected amount of the lead prior to the application of excess writing pressure, the projected or exposed amount of the lead at the stage shown in Fig. 1, is maintained constantly at a certain value and, thus, the objective purpose of the invention is achieved.
  • the chuck 25 is constructed to open when stress is applied thereto. If the chuck does not to open during the normal opening described above, the pencil cylinder 1 is pushed further downwards then as shown in Fig. 3. Then the stopper 5 descends and the chuck 25 as well descends, so that the recessed taper 25a collides with the projected taper 16 and forces the chuck 25 to open to its full extent.
  • the projected amount or the lead can be selected in accordance with the user's own choice. That is, the height of respective thread pairs of the saw-set surface 15 which determines the projected amount of the lead, is varied so that the projected amount can be controlled by rotating the writing cylinder 13 to select preferably thread pair. A similar effect can be obtained if the angle of respective oblique surfaces 10 of the metal is varied. In this instance, however, a pair of oval followers 14 should be used.
  • the lead protective passage 17 no obstacle such as rubber packing is provided in the lead protective passage 17 so that the lead may fall freely under gravity when the chuck is opened. Accordingly, the lead remains in the chuck, and projects only by detaching the writing cylinder from the sheet.
  • a predetermined amount of the lead remains projected constantly from the writing cylinder. If a two-stage knocking mechanism or a rotary entering mechanism is provided instead of an eraser at the top of the pencil cylinder, usability of the pencil is more enhanced. In this case, an outer cylinder is covered on the pencil cylinder so that the writing cylinder or the metal portion can be entered into or out from the outer cylinder.

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
EP82306005A 1981-11-12 1982-11-11 Bleistift mit regulierbarer Mine Withdrawn EP0082594A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18191581A JPS5882795A (ja) 1981-11-12 1981-11-12 シヤ−プペンシル
JP181915/81 1981-11-12

Publications (2)

Publication Number Publication Date
EP0082594A2 true EP0082594A2 (de) 1983-06-29
EP0082594A3 EP0082594A3 (de) 1984-08-08

Family

ID=16109122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82306005A Withdrawn EP0082594A3 (de) 1981-11-12 1982-11-11 Bleistift mit regulierbarer Mine

Country Status (3)

Country Link
EP (1) EP0082594A3 (de)
JP (1) JPS5882795A (de)
AU (1) AU9033382A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3546418C1 (de) * 1985-12-31 1987-02-26 Staedtler Fa J S Füllminenstift mit axial beweglichem Minenführungsrohr.
DE102016110211A1 (de) 2016-06-02 2017-12-07 Pelikan Pbs-Produktionsgesellschaft Mbh & Co. Kg Schreibgerät mit versenkbarer Schreibspitze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6001907B2 (ja) * 2012-04-05 2016-10-05 ミクロ株式会社 シャープペンシル

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2654281A1 (de) * 1976-11-30 1978-06-01 Ancos Co Ltd Mechanischer schreibstift
US4211500A (en) * 1977-12-27 1980-07-08 Pentel Kabushiki Kaisha Tip-pushed type mechanical pencil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2654281A1 (de) * 1976-11-30 1978-06-01 Ancos Co Ltd Mechanischer schreibstift
US4211500A (en) * 1977-12-27 1980-07-08 Pentel Kabushiki Kaisha Tip-pushed type mechanical pencil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3546418C1 (de) * 1985-12-31 1987-02-26 Staedtler Fa J S Füllminenstift mit axial beweglichem Minenführungsrohr.
DE102016110211A1 (de) 2016-06-02 2017-12-07 Pelikan Pbs-Produktionsgesellschaft Mbh & Co. Kg Schreibgerät mit versenkbarer Schreibspitze

Also Published As

Publication number Publication date
JPS5882795A (ja) 1983-05-18
EP0082594A3 (de) 1984-08-08
AU9033382A (en) 1983-05-19

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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PUAL Search report despatched

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19850409

RIN1 Information on inventor provided before grant (corrected)

Inventor name: OUTSUKA, KATSUMI