EP0736396A1 - Kugelschreiber - Google Patents

Kugelschreiber Download PDF

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Publication number
EP0736396A1
EP0736396A1 EP95105192A EP95105192A EP0736396A1 EP 0736396 A1 EP0736396 A1 EP 0736396A1 EP 95105192 A EP95105192 A EP 95105192A EP 95105192 A EP95105192 A EP 95105192A EP 0736396 A1 EP0736396 A1 EP 0736396A1
Authority
EP
European Patent Office
Prior art keywords
tip
ink
ball
ballpoint pen
front edge
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Withdrawn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
EP95105192A
Other languages
English (en)
French (fr)
Inventor
Hideshi c/o Sailor Pen Co. Ltd. Okamoto
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.)
Sailor Pen Co Ltd
Original Assignee
Sailor Pen 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 Sailor Pen Co Ltd filed Critical Sailor Pen Co Ltd
Priority to EP95105192A priority Critical patent/EP0736396A1/de
Publication of EP0736396A1 publication Critical patent/EP0736396A1/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Withdrawn legal-status Critical Current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
    • B43K7/00—Ball-point pens
    • B43K7/02—Ink reservoirs; Ink cartridges
    • B43K7/08—Preventing leakage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K7/00—Ball-point pens
    • B43K7/01—Ball-point pens for low viscosity liquid ink

Definitions

  • This invention relates to a direct filled type ballpoint pen having an ink directly charged to an ink reservoir thereof.
  • inks particularly aqueous inks
  • aqueous inks have low viscosity
  • most of the ballpoint pens are of core wad type, in which a rod-shaped core wad, prepared by stretching and shaping together curled extra fine fibers, is impregnated with an aqueous ink, and the ink in the core wad is designed to be fed to the ball via a relay core.
  • the pen head of the above-described ballpoint pen has a complicated structure because of the capillary ink and air grooves and the comb-shaped ink reservoir consisting of a plurality of teeth.
  • accuracy is required of the pen head, because it must be brought into intimate contact with the inner circumference of the ink reservoir. Accordingly, it takes time and trouble for the production of the pen head, becoming a major cause of preventing cost reduction.
  • a slide plug is slidably disposed to be fluid tight in an ink reservoir; an ink is charged to the space forward than the slide plug; and a tip retaining a ball rotatably therein such that the ball may partly appear from the front edge of the tip is attached to the front end portion of the ink reservoir, wherein the ball is resiliently urged by a spring to be brought into contact with the caulked front edge of the tip, when the ballpoint pen is not used.
  • a paste-like counterflow preventing material is disposed in place of the slide plug.
  • a spring having a small mass is used and is disposed within the tip.
  • the ballpoint pen When the ballpoint pen is not used, since the ball rotatably retained in the front end portion of the tip is resiliently urged by the spring to be brought into contact with the caulked front edge of the tip, a valve mechanism can be formed by the ball and the caulked front edge of the tip. Accordingly, even if the ink contained in the ballpoint pen has a low viscosity, dripping of the ink can be prevented. Meanwhile, during writing, the ball is retracted by the hand force to open the valve mechanism and allow the ink to be consumed.
  • the slide plug or the counterflow preventing material advances as the ink is consumed, the negative pressure to be generated in the ink reservoir with the consumption of the ink can be canceled to allow the ink to be fed to the ball, enabling writing with the ballpoint pen. Namely, since the pen head which has a complicated structure and is required to have accuracy becomes unnecessary, a ballpoint pen having a simple structure can be produced inexpensively according to this invention.
  • the spring having a small mass disposed in the tip, even if a great impact is applied to the ballpoint pen, for example, when the ballpoint pen is dropped onto the floor, the inconvenience that the ball slips off the tip can be prevented, because the inertia force of the spring is small and the spring pushes the ball weakly.
  • a bullet-like stainless steel tip 2 has a bore 21 through which an ink is passed and is also provided with a ball house 22 at the front end portion thereof.
  • the ball house 22 communicates to the bore 21 via a center hole 23 and vertical grooves 24 formed radially.
  • a ball 1, for example, made of a hard metal and having a diameter of 1.0 mm is retained in the ball house 22 to be movable forward and backward over a predetermined stroke, and appears partly from the front edge 26 of the tip 2.
  • a spring 5 having a small mass is disposed in the bore 21 of the chip 2.
  • the front end portion of the spring 5 is inserted to the center hole 23 so as to urge the ball 1 forward and bring the ball 1 into contact with the front edge 26 of the tip 2 when the ballpoint pen is not used.
  • a valve mechanism is formed between the ball 1 and the front edge 26 of the tip 2, and dripping of the ink is designed to be prevented without using the pen head.
  • a pusher may be interposed between the ball 1 and the spring 5 so as to urge the ball 1 forward by the pusher.
  • the thus constituted tip 2 is attached directly or via a holder (not shown) to the front end opening of the ink reservoir 3 serving also as the barrel.
  • a slide plug 4 for example, made of a silicone rubber is slidably disposed to be fluid tight within the ink reservoir 3, and an aqueous ink (not shown), so-called a gel ink, having a relatively high static viscosity which can be lowered by the rotation of the ball is fully charged in the space forward than the slide plug 4 to the bore 21 of the tip 2, with no air migrated therein. Accordingly, the slide plug 4 slides forward as the ink is consumed.
  • the ballpoint pen according to this invention is of the direct filled type which can provide a long total writing length, the sliding resistance of the slide plug 4 contributes to the prevention of ink dripping, because no air which can readily be expanded by heat is migrated into said space.
  • a tail plug 6 having a vent 61 is fitted to the rear end portion of the ink reservoir 3.
  • a paste-like counterflow preventing material 7 may be disposed in place of the slide plug 4, as shown in Fig. 2, and a gel ink (not shown) may be charged in the space forward than the material 7 to the center hole 21 of the tip 2.
  • the ballpoint pen When the ballpoint pen is to be used, the ballpoint pen is moved with the ball 1 thereof being pressed against a surface to be written. Then, the ball 1 retracts against the resilience of the spring 5 and rotates in contact with the seat 25, thus enabling writing with the ballpoint pen.
  • the slide plug 4 or the counterflow preventing material 7 advances as the ink is consumed. Accordingly, the negative pressure in the ink reservoir 3 is canceled to allow the ink to be fully fed to the ball 1, enabling continuous writing with the ballpoint pen.
  • the slide plug 4 or counterflow preventing material 7 is prevented from being under the ink head, and further it does not happen that the slide plug 4 or counterflow preventing material 7 retracts to allow the ink to leak from the rear end of the ink reservoir 3.
  • the ball rotatably retained in the front end portion of the tip is resiliently urged by the spring to be brought into contact with the caulked front edge of the tip and form a valve mechanism, and a slide plug or a paste-like counterflow preventing material is disposed in the ink reservoir, so that dripping of the ink can be prevented.
  • the slide plug or counterflow preventing material advances if the ink is consumed, the ink reservoir does not assume a negative internal pressure, thus enabling continuous writing with the ballpoint pen.
  • the valve mechanism consisting of the ball and the front edge of the tip is closed when the tip is allowed to face upward, the slide plug or counterflow preventing material is prevented from being under the ink head, and further it does not happen that the slide plug or counterflow preventing material retracts to allow the ink to leak from the rear end of the ink reservoir. Accordingly, the pen head which has a complicated structure and is required to have accuracy becomes unnecessary, and thus a ballpoint pen which has a simple structure can be produced inexpensively according to this invention.
  • the spring having a small mass disposed in the tip, even if a great impact is applied to the ballpoint pen, for example, when the ballpoint pen is dropped onto the floor, the inconvenience that the ball breaks through the front edge of the tip to slip off therefrom can be prevented, because the inertia force of the spring is small and the spring pushes the ball weakly.

Landscapes

  • Pens And Brushes (AREA)
EP95105192A 1995-04-06 1995-04-06 Kugelschreiber Withdrawn EP0736396A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95105192A EP0736396A1 (de) 1995-04-06 1995-04-06 Kugelschreiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95105192A EP0736396A1 (de) 1995-04-06 1995-04-06 Kugelschreiber

Publications (1)

Publication Number Publication Date
EP0736396A1 true EP0736396A1 (de) 1996-10-09

Family

ID=8219167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105192A Withdrawn EP0736396A1 (de) 1995-04-06 1995-04-06 Kugelschreiber

Country Status (1)

Country Link
EP (1) EP0736396A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022045313A1 (ja) * 2020-08-31 2022-03-03 株式会社パイロットコーポレーション ボールペン
US11993099B2 (en) 2020-08-31 2024-05-28 Kabushiki Kaisha Pilot Corporation Ballpoint pen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE509365A (de) *
NL65419C (de) * 1900-01-01
GB2097007A (en) * 1981-04-21 1982-10-27 Mar Tex Corp Marking device paint system
GB2281257A (en) * 1993-08-31 1995-03-01 Mitsubishi Pencil Co Conserving aqueous inks in reservoirs of writing instruments.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE509365A (de) *
NL65419C (de) * 1900-01-01
GB2097007A (en) * 1981-04-21 1982-10-27 Mar Tex Corp Marking device paint system
GB2281257A (en) * 1993-08-31 1995-03-01 Mitsubishi Pencil Co Conserving aqueous inks in reservoirs of writing instruments.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022045313A1 (ja) * 2020-08-31 2022-03-03 株式会社パイロットコーポレーション ボールペン
US11993099B2 (en) 2020-08-31 2024-05-28 Kabushiki Kaisha Pilot Corporation Ballpoint pen

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Legal Events

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

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AK Designated contracting states

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Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19970204

17Q First examination report despatched

Effective date: 19971117

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: 19980528