EP0626276B1 - Stylo-pointe-bille - Google Patents

Stylo-pointe-bille Download PDF

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Publication number
EP0626276B1
EP0626276B1 EP19940104220 EP94104220A EP0626276B1 EP 0626276 B1 EP0626276 B1 EP 0626276B1 EP 19940104220 EP19940104220 EP 19940104220 EP 94104220 A EP94104220 A EP 94104220A EP 0626276 B1 EP0626276 B1 EP 0626276B1
Authority
EP
European Patent Office
Prior art keywords
ball
tip
ink
valve chamber
point pen
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
EP19940104220
Other languages
German (de)
English (en)
Other versions
EP0626276A1 (fr
Inventor
Seiichi Kobayashi
Kazuhiko Furukawa
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.)
Mitsubishi Pencil Co Ltd
Original Assignee
Mitsubishi Pencil 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
Priority claimed from JP1993012171U external-priority patent/JP2604349Y2/ja
Priority claimed from JP3185693U external-priority patent/JPH0683380U/ja
Application filed by Mitsubishi Pencil Co Ltd filed Critical Mitsubishi Pencil Co Ltd
Publication of EP0626276A1 publication Critical patent/EP0626276A1/fr
Application granted granted Critical
Publication of EP0626276B1 publication Critical patent/EP0626276B1/fr
Anticipated expiration legal-status Critical
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
    • B43K7/00—Ball-point pens
    • B43K7/01—Ball-point pens for low viscosity liquid ink
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K23/00—Holders or connectors for writing implements; Means for protecting the writing-points
    • B43K23/08—Protecting means, e.g. caps
    • B43K23/12—Protecting means, e.g. caps for pens
    • B43K23/122—Protecting means, e.g. caps for pens with means for preventing choking
    • B43K23/124—Protecting means, e.g. caps for pens with means for preventing choking comprising an air passage
    • 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

Definitions

  • the present invention relates to an improved ball-point pen equipped with a back leaking preventing mechanism and in particular to an improved ball-point pen which uses a so-called thixotropic ink (having shear viscosity decreasing property) which has a relatively low ink viscosity as compared to the ink used for oil type ball-point pens and therefore is subject to flow backward and which presents high viscosity at static state but lowers its viscosity due to the rolling of a ball when writing to flow out.
  • thixotropic ink having shear viscosity decreasing property
  • the present applicant has disclose, a back leaking preventing mechanism in Japanese Utility Model Publication Hei 4 No.52067 in which prevention of back leaking of ink is effected by providing a valve chamber having a ball valve put therein with play.
  • This disclosure provides a plastic mouthpiece made of a synthetic resin, which holds a ball in a valve chamber thereof and which is provided with a required number of projected bars so that the ball is put therein with play and cannot slip cut. At writing, ink flows to the tip through channels formed between the projected bars.
  • the plastic mouthpiece is formed by injection-molding.
  • the projected bars are formed as undercut, so that it is hard to form them with high dimensional accuracy. Further, a troublesome treatment is needed to allow the projected bars not to be damaged when the ball is inserted into the chamber by pushing away the projected bars.
  • this method suffers from another drawback which arises when centrifugal treatment is effected at manufacturing stage in order to remove bubbles mingled in the ink filled. More specifically, when the centrifugal operation is performed, the ball is pushed toward the projected bar area by the centrifugal force so that the ball is bitten and fixed by the projected bars.
  • Conventionally known ball-point pens can be categorized into two types, one of which is a so-called oil type ball-point pen that uses a high viscosity ink.
  • the other is a so-called water type ball-point pen which includes sliver fibers holding ink therein and an ink feeder that leads ink from the fibers to the tip of the ball-point pen.
  • Each type of the ball-point pens has several defects, but the most notable defects with regard to the oil type ball-point pen are ink-blobbing due to the high viscosity of the ink used and low writing density.
  • the water type ball-point pen takes a higher cost for materials used since the water type ball-point pen uses sliver fibers for keeping the ink. Additionally, the water type ball-point pen has a drawback that consumption of ink cannot be known.
  • the ink is volatile or easy to vaporize and the ball-point pen is adapted such that a large amount of ink flows out in order to enhance the written density. Accordingly, the ink reservoir is made large in diameter so that it can keep a large amount of ink.
  • the viscosity of the ink is small as compared to those for oil-type ball-point pens, the flow resistance of the ink in question to the ink reservoir is small.
  • the ink is liable to leak backward to the rear end of the ink reservoir due to self-weight of the ink and impacts from the outside.
  • the tip ball is subject to slip out due to falling impacts.
  • the ball-point pens of this type are generally provided at the rear end of the ink in the reservoir with a greasy follower which moves following the consumption of ink during writing and prevents the vaporization of ink as well as inhibits the back leaking of ink which would be brought about by the self-weight of ink or the outside impact.
  • Typical ball-point pens are suffering from bad write-feeling with writing since there is a gap between the tip opening of the mouthpiece and the tip and therefore the tip rattles or sways.
  • Japanese Utility Application Laid-Open Sho 49 No.30035 discloses a follower with a cup-shaped float immersed therein.
  • a typical follower not only effects the aforementioned function but also serves to inform the user of the finish or exhaustion of ink. Therefore, it is naturally considered that the follower is to be colored.
  • a dye used is compatible with or soluble in the ink, it becomes difficult to keep a clear separation from the ink end. To make matters worse, the follower might flow into the tip portion, causing deterioration of writing performance.
  • a typical ball-point pen using a thixotropic ink employs a cap having a resilient, non-absorptive sealing piece made of a closed air-foam material, and when the pen is out of use, the tip ball is pressed against the sealing piece.
  • the front barrel end of the pen is covered with the resin cap so as to hermetically seal the tip end.
  • the cap has no ventilating means, pressure inside the cap can rise upon fitting the cap. Part of the pressurized air is forced into the ink through slight clearance between the ball and the tip holding the ball. The thus flowed-in air is left or accumulated as air bubbles in the ink due to the blockade of the follower and the air bubbles disadvantageously inhibit the ink from smoothly flowing at writing.
  • ventilating means is provided between the pen tip and the cap to prevent the above effect, but this gives rise to adverse influence with regard to vaporization of the ink.
  • GB-A-2 078 175 relates to a ball-point pen. It comprises a valve ball being received within a valve chamber to be freely movable axially thereof.
  • a valve seat is formed by reducing the diameter of the wall at the end of the valve chamber, after having put in the ball, remote from the shoulder so as to form an opening of a smaller diameter than the diameter of the valve ball.
  • the valve seat can be produced by a simple shaping operation such as a drawing operation for reducing the diameter of the rearward portion of the wall of the valve chamber.
  • a second object of the present invention is to provide a ball-point pen in which shaking or swaying movement of the tip is prevented even if there is a clearance between the tip opening of the mouthpiece and the tip, so as to achieve a good feeling with writing.
  • a third object of the present invention is to provide an improvement of a ball-point pen using a so-called thixotropic ink (having shear viscosity decreasing property) which presents high viscosity at static state but lowers its viscosity due to the rolling of a ball at writing to provide easy ink flow to thereby provide a ball-point pen having an increased ink reserve by making an ink reservoir greater in its inside diameter and/or in its length so as to lengthen the life of the pen.
  • thixotropic ink having shear viscosity decreasing property
  • a fourth object of the present invention is to provide a ball-point pen with a refill which, upon manufacture of refills of ball-point pens wherein the refills having been filled up with ink and an ink follower are bundled and undergo the centrifugal operation so as to remove air bubbles mingled in the ink, allows the ink to be defoamed in such an assured manner that the bundle of all the refills may be abutted at their tip ends against an abutting surface inside a container of a centrifugal separator.
  • a fifth object of the present invention is to provide a ball-point pen capable of clearly informing about the exhausted state of ink without deteriorating writing performance.
  • a sixth object of the present invention is to provide a ball-point pen which can regulate elevation of the pressure inside the pen when a cap is attached so as not to prevent air from flowing into the ink and which can prevent the vaporization of ink by simple means.
  • a seventh object of the present invention is to provide a ball-point pen which allows air to pass through a pen cap so that it can prevent hazards such as choking in case an infant accidentally swallows the cap and the cap gets stuck in its throat.
  • a ball-point pen of the present invention includes a joint which defines a ball valve seat 13 at an approximately central portion thereof in axial direction.
  • the ball valve seat 13 constitutes one end of a conduit 17 which communicates with an ink reservoir.
  • the joint also defines a valve chamber 12 in which a ball valve 14 is put with play and a tip fitting hole 10 in the front part of the valve chamber.
  • the joint further includes means regulating the ball valve 14 not to stop up the end hole of a tip 5 which is fit in the tip fitting hole 10 when the tip fitting hole 10 is positioned down.
  • One of such means can be constructed so that the conduit 17 of the ball valve seat 13 that communicates with the ink reservoir is disposed eccentrically in a proper manner relative to the end hole of the tip 5 but the valve chamber 12 is made to stay within a range of the inside circumference of the tip fitting hole 10.
  • the eccentricity s is represented by an interval between a central axis line 33 of tip end portion and a central axis line 34 of conduit 17.
  • the axis of the tip end hole is made coincident with that of the tip fitting hole while the axis of the conduit 17 communicating with the ink reservoir is made eccentric to the axis of the tip end hole.
  • the axis of the conduit 17 may be made coincident with that of the ball-point pen whale the tip end hole is disposed eccentrically relative to the tip fitting hole 10.
  • the aforementioned means that does not stop up the end hole of the tip 5 includes all these configurations.
  • Figs. 12 to 15 the axis of the conduit is made coincident with that of the tip end hole while preferably a plurality of vertical ribs 15a each having a different height are disposed in required positions on the peripheral wall of the valve chamber. These ribs are provided in such a manner that a cylindrical space may be created by top surfaces of these ribs and the axis of the thus formed cylindrical space is made eccentric to the axis of the tip end hole.
  • a valve which has a spherical shape at least on a surface that contacts with the conduit is put with play in the thus formed cylindrical space.
  • the axis of the ball valve placed on the Communicating opening to the conduit is made eccentric to the axis of the conduit.
  • the ball valve may be structured by a hemispheric form with a projection 14a on the plane side.
  • the projection 14a must be formed enough long to keep the hemispheric portion of the valve to orient toward the conduit and must be shaped so as not to be fit into the tip end hole.
  • This hemispheric structure makes it possible to limit the length of the vertical ribs in the valve chamber to the vicinity of the ball valve seat.
  • the axis of the conduit 17 of the ball valve seat 13 that communicates with the ink reservoir is properly made eccentric to the axis of the tip fitting hole 10 while the valve chamber 12 is made to stay within a range of the inside circumference of the tip fitting hole. Accordingly, when the ball-point pen is oriented upward or with the ball valve being fit on ball valve seat 13, the center of the ball valve 14 is made eccentric in a little amount from the axis of the tip fitting hole 10 to form a room on one side of the valve chamber.
  • a channel 15 is provided in the thus formed room on the side of the valve chamber. This structure allows the idly held ball 14 in the valve chamber 12 to abut the tip rear end 18 eccentrically in a writing position (with the tip downward) to create a ink flowing passage communicating from the ink reservoir through the conduit 17 and channel 15 to the ink tip. Thus, ink may be supplied into the tip.
  • the joint is mainly composed of a squeezing pipe portion 7, a flange 16 and a fitting pipe portion 11.
  • a plurality of vertical ribs 8 of tapered form are extended along the length of the squeezing pipe portion 7 to the flange 16. These vertical ribs 8 press an inner step portion of a mouthpiece 2 (called as plastic mouthpiece if it is made of plastic) to contact with a good bite therewith when the mouthpiece 2 is screwed into the barrel so that the tip will not sway at writing.
  • Ink reservoir is filled with ink having thixotropic property, and a follower 20 that moves following the consumption of the ink is provided at the rear end of the ink so as to prevent the vaporization of the ink.
  • the follower composed of a transparent or translucent greasy material is filled over the ink with a colored resin piece immersed therein having a specific weight approximately equal to that of the follower, so that the remaining amount of ink can be clearly seen and that the tip ball can be prevented from slipping out by falling impacts.
  • the aforementioned flange 16 is provided in an annular form at the rear end of the squeezing pipe portion 7 in the joint so that the front end of the barrel 1 is abutted against the rear side of the annular flange 16.
  • the aforementioned ribs 8 are formed with linearly or curvingly slanting surfaces and provided at required positions on the outside surface of the squeezing pipe portion 7 while rear ends of the ribs are connected with the flange 16 in level with the outside diameter surface of the flange.
  • the aforementioned mouthpiece 2 is fixed to the barrel 1 with the inner step portion of the mouthpiece being contacted with a good bite to the peripheral portions of the ribs. Further, there is provided a ventilating passage communicating from the tip to an inner space 1a inside the barrel.
  • the ventilating passage from a clearance at the front opening of the mouthpiece 2 between the tip 5 penetrated therethrough and the opening edge is communicated by way of channels defined between ribs 8 disposed on the peripheral surface of the squeezing pipe portion 7 and the inner surface of the mouthpiece and by way of recesses 6a formed at the front barrel end to the inner space 1a inside the barrel.
  • a cap 23 which is fit on and fixed to the front barrel is formed integrally with an inner cap 25 for hermetically covering the tip portion in a small room. Formed through the cap 23 and the inner cap 25 is a vent which communicates from the inserting side to the rear end of the cap.
  • the inner cap is further provided with a resilient, non-absorptive sealing piece 28 made of a closed air-foam material for pressing the tip end 5a.
  • Fig.1 is a vertical cross-section showing a whole part of a ball-point pen with a tip oriented upward.
  • Fig.2 is a vertical section showing a joint portion as a main part of Fig.1.
  • a joint 3 includes a squeezing pipe portion 7 disposed in the front half, a fitting pipe portion 11 in the rear half and a flange 16 between the former two.
  • the squeezing pipe portion 7 on the front side is provided on its outside surface with a plurality of tapered vertical ribs 8.
  • the fitting pipe portion 11 is secured to an ink reservoir 4, which in turn is fit in with or covered by a barrel 1.
  • a tip 5 having a ball at the top thereof is press-fitted into, a tip fitting hole 10 disposed at the front end of the squeezing pipe portion 7.
  • the joint 3 is integrally molded of an elastically deformable synthetic resin and defines a valve chamber 12 behind the tip fitting hole 10 communicating therewith.
  • valve chamber 12 The principal surface of the valve chamber 12 is defined eccentrically to the axis of the tip fitting hole 10 with the valve chamber 12 being contained within a range of the inner periphery of the tip fitting hole 10. Further, the valve chamber 12 includes a ball valve seat 13 at the rear part thereof while the axis of the hole of the ball valve seat 13 is made eccentric with a proper eccentricity (eccentricity S) relative to the axis of the tip fitting hole 10. Moreover, a channel 15 is provided on one side of the valve chamber space.
  • a ball valve 14 is put with play inside the valve chamber 12.
  • a conduit 17 which communicates with the ink reservoir disposed therebehind.
  • the flange 16 is provided at the rear end of the squeezing pipe portion 7 and the fitting pipe portion 11 is extended backward from the rear side of the flange 16.
  • the cylindrical ink reservoir 4 is pressingly secured to the outside periphery of the fitting pipe portion 11 in such a manner that the front end of the reservoir 4 abuts the rear side of the flange 16 while the inner portion of the ink reservoir 4 communicates with the conduit 17 of the joint 3.
  • Filled inside the ink reservoir 4 is thixotropic ink 19 (having shear viscosity decreasing property) which presents high viscosity at static state but lowers its viscosity to provide easy flow of ink due to the rolling of a ball at writing (Fig.1).
  • Filled at the rear of the ink 19 is a greasy follower 20 which is in contact with the ink surface for preventing the ink from vaporizing and moves as the ink decreases.
  • the ink reservoir 4 is formed of a transparent polypropylene resin molding and the like which inhibits vaporization of ink.
  • the joint 3 securely joins the tip 5 with the ink reservoir 4 full of ink to form a writing portion.
  • the thus formed writing portion is inserted into the barrel 1 from the front end thereof until the rear side of the flange 16 of the joint 3 abuts the front side of the barrel end 6.
  • the mouthpiece 2 is screwed into the barrel end 6 of the barrel 1 with vertical ribs 8 of the squeezing pipe portion 7 being in a biting contact with the inner step portion 9 of the mouthpiece 2.
  • a vent or some vents for communicating with the inner space of the barrel are provided in appropriate positions on the barrel 1.
  • a vent (not shown) in communication with the barrel inside is provided in a plug 22 squeezed at the rear end of the barrel 1.
  • Fig.6 shows a writing state where the tip is oriented downward.
  • the ball 14 abuts the tip end 18 with offset to one side.
  • a channel which allows the ink to flow into the tip 5 e.g. an ink flowing passage 19a is formed on the other side.
  • Ink is supplied from the ink reservoir 4 through the conduit 17 to the valve chamber 12.
  • the ink in the valve chamber 12 further passes through the channel 15 and the ink flowing passage 19a and is led to the front end of the tip 5.
  • the ink presents a high viscosity at static state, but the viscosity of the ink is lowered by the rolling of the ball at the end of the tip 5 so as to flow out a large quantity of ink.
  • Figs.2 and 5 show a state in which the tip 5 is oriented upward. In this state, the ball 14 is placed on the ball valve seat 13 of the valve chamber 12 to stop up the conduit 17. Accordingly, even when the ink immediately under the ball of the tip is exhausted by writing in the downside-up position, no head is acted on the ink and therefore no back leaking occurs.
  • the tip 5 is squeezed into the tip fitting hole 10 of the squeezing pipe portion 7 in the joint 3 while the inner step portion 9 of the mouthpiece 2 abuts or is brought in a biting contact with vertical ribs 8, the tip 5 is prevented from moving or swaying relative to the mouthpiece 2.
  • a front half part of a joint 3 is composed of a squeezing pipe portion 7 which is provided in required positions with linear or curved ribs 8. There is formed an annular flange 16 at the rear side of ribs 8 in such a manner that the rear ends of ribs 8 are substantially leveled with the outside surface diameter side face of the flange 16.
  • the joint 3 includes a fitting pipe portion 7 as a rear half part thereof and an ink reservoir is secured to the fitting pipe portion 11. Squeezed into a tip fitting hole 10 disposed at the front end of the squeezing pipe portion 7 is a rear end of a tip 5 that holds a tip ball 5a.
  • the joint 3 is integrally molded of an elastically deformable synthetic resin and defines a valve chamber 12 behind the tip fitting hole 10 communicating therewith.
  • a frustum-shaped ball-valve seat 13 Provided in the rear part of the valve chamber 12 is a frustum-shaped ball-valve seat 13.
  • the principal surface of the valve chamber 12 is defined eccentrically to the axis of the tip fitting hole 10 with the valve chamber 12 being contained within a range of the inner periphery of the tip fitting hole 10. Further, the axis of a hole in the valve chamber 12 is made eccentric properly relative to the axis of the tip fitting hole 10.
  • a channel 15 is provided on one side of the valve chamber space.
  • a ball valve 14 is put with play inside the valve chamber 12.
  • Formed in the rear part of the valve chamber 12 is a conduit 17 which communicates with the ball valve seat 13. Meanwhile, if the rear end hole of the tip is disposed eccentrically relative to the tip fitting hole 10, the valve chamber 12 need not necessarily be made eccentric.
  • the flange 16 is provided on the rear side of the squeezing pipe portion 7 and the fitting pipe portion 11 is extended backward from the rear side of the flange 16.
  • the cylindrical ink reservoir 4 is pressingly secured to the outside periphery of the fitting pipe portion 11 in such a manner that the front end of the reservoir 4 abuts the rear side of the flange 16 while the inner portion of the ink reservoir 4 communicates with the conduit 17 of the joint 3.
  • Filled inside the ink reservoir 4 is thixotropic ink 19 (having shear viscosity decreasing property) which presents high viscosity at static state but lowers its viscosity to provide easy flow of ink due to the rolling of the tip ball when writing.
  • a transparent or translucent greasy follower 20 filled at the rear of the ink 19 which is in contact with the ink surface for preventing the ink from vaporizing and moves as the ink decreases.
  • a colored resin piece having a specific weight approximately equal to that of the follower is immersed in the follower 20.
  • the colored resin piece is of a pipe piece 21 composed of PP resin or the like, and is immersed in the follower 20 with the inside and outside of the piece 21 filled with the follower 20.
  • the pipe piece 21 is positioned such that a rear part of the pipe piece 21 projects over the rear end of the follower 20.
  • the colored resin piece is not limited to the pipe piece but may be replaced with a rod piece or ball which has an outside diameter properly smaller than the inner diameter of the ink reservoir 4 and is immersed in the follower.
  • the ink reservoir 4 is formed of a transparent PP resin molding and the like which inhibits vaporization of ink.
  • the thus composed arrangement of the tip 5, joint 3 and ink reservoir 4 forms a refill of the ball-point pen.
  • the rear end of the barrel 1 is attached with a plug 22.
  • the barrel 1 is formed of a transparent resin molding so that the consumption of ink can be seen.
  • a ventilating passage from the clearance at the front opening of the mouthpiece between the tip 5 penetrated therethrough and the opening edge is formed so as to be introduced through channels between ribs 8 disposed on the squeezing pipe portion 7 and the inner surface of the mouthpiece 2 and recesses 6a formed at the front side of the barrel end 6 to the inner space 1a inside the barrel 1.
  • a vent or some vents are provided, as required, on a side surface of the barrel 1, or on the plug 22 or between the plug and the barrel, in order to communicate between the inner space 1a and the outside atmosphere.
  • a cap 23 that covers the front barrel includes a clip 24 on the outer peripheral side thereof.
  • This clip 24 is fixed to the cap 23 by press-fitting the cylindrical portion 30 disposed at the rear of the clip into a rear end hole of the cap 23.
  • a vent 29 penetrates through the rear end of the cylindrical portion 30.
  • a cylindrical inner cap 25 defining a small room 27.
  • This inner cap 25 is integrally formed with the cap 23 using a required number of ribs 26 held by the inner surface of the cap 23.
  • An engaging portion 32 is disposed around the inserting opening of the cap 23 and is detachably engaged with another engaging portion 31 disposed on the barrel 1.
  • this engagement is constructed by a familiar way such as an snap-fitting engagement between projection and recess.
  • a resilient, non-absorptive sealing piece 28 made of a closed air-foam material, so that the tip ball 5a is properly pressed by the sealing piece 28 while the tip 5 and the mouthpiece 2 is hermetically confined in the small room 27.
  • the ball valve 14 comes in annular contact with the ball valve seat 13 in the valve chamber 12 to seal the conduit 17 as shown in Fig.10 when the tip 5 is oriented upward, it is possible prevent the ink from flowing backward in the state of downside-up writing. Since, as shown in Fig.10 where the front barrel is capped by the cap 23, the front end of the tip 5 abuts the sealing piece 28, no trouble of the tip ball 5a slipping out due to falling impacts can occur. Additionally, since the ball valve 14 is put with play in the valve chamber 12 in such a manner as to be made eccentric properly to the tip end hole 18, no trouble occurs of the ball valve biting into the tip end hole when the refill with ink filled up is subjected to the centrifugal separation upon the manufacture.
  • the ball valve 14 if the ball valve 14 abuts the tip end portion 18, the ball valve is set off the center so that the ink flowing channel into the tip 5 can be surely established. Further, since the colored resin piece is immersed in the follower 20, not only can the exhaustion of ink be clearly seen, but also the total inner friction is increased even if the flow resistance of the follower lowers as compared to the system with no resin piece. Accordingly, more reliable safety against back leaking can be assured and impactive pressurization on the tip ball 5a caused by shocks can be relaxed so that it is possible to prevent the tip ball 5a from slipping out even when the cap 23 is not placed.
  • the tip ball 5a Since the tip ball 5a is hermetically confined by the inner cap 25, it is possible to prevent the tip ball 5a from drying as well as to prevent the ink from vaporizing.
  • the air passage is established from the tip opening of the mouthpiece 2 to the inner space 1a inside the barrel 1, the augment and reduction of pressure inside the barrel due to attachment or removal of the cap can be relieved so that it is possible to prevent the problem of air bubbles flowing into the ink.
  • the vent 29 would allow the infant to breathe. Since the outside surface of ribs 8 formed on the squeezing pipe portion 7 in the joint 3 are brought in biting contact with the inner step portion 9 of the mouthpiece 2, movement or swaying of the tip 5 relative to the mouthpiece 2 can be prevented.
  • tips of refills must be abutted against a certain surface in a container of a centrifugal separator; otherwise ink would spout out from the tip end to pollute the container.
  • Conventional refills would be entangled with one another when bundled for loading the refills in the container of the centrifugal separator. This would keep some refills at their tips spaced from the abutted surface to thereby pollute the container.
  • the ribs having linearly or curvingly slanting top surfaces are provided on the joint in such a manner that the ribs are in level with the flange outside diameter surface at their adjoining points, no refills are entangled with each other at the joint portions when refills are bundled for the centrifugal operation in the container of the centrifugal separator. Therefore, tips of the refills can be properly abutted in place so that it is possible to prevent ink from spouting out from those tip and therefore it is possible to avoid the pollution of the container.

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Claims (9)

  1. Stylo à bille équipé d'un mécanisme pour empêcher les fuites vers l'arrière, comprenant :
    un joint qui comprend :
    une chambre de soupape disposée dans une partie approximativement au milieu dudit joint par rapport à la direction axiale de celui-ci pour tenir à l'intérieur une soupape à bille avec jeu, ladite soupape à bille pouvant être librement mise en place ou enlevée en démontant un embout, ladite chambre de soupape ayant en outre un siège de soupape à bille dans sa partie postérieure;
    un perçage de montage d'embout disposé dans la partie frontale de ladite chambre de soupape ; et
    un conduit disposé dans l'arrière de ladite chambre de soupape et communiquant avec celle-ci via ledit siège de soupape à bille,
    ledit joint tenant un embout par ledit perçage de montage d'embout et tenant un réservoir d'encre qui communique avec ledit conduit ; et ledit siège de soupape permettant à ladite soupape à bille de s'engager sur ledit siège de soupape à bille de manière à bloquer ledit conduit lorsque ledit perçage de montage d'embout est orienté vers le haut,
    caractérisé par des moyens qui permettent à ladite soupape à bille d'être espacée depuis une surface de paroi de ladite chambre de soupape et d'être retenue de manière à ne pas bloquer le perçage d'extrémité dudit embout, qui sont construits de telle manière que l'axe dudit siège de soupape à bille, défini par l'axe passant par le centre de ladite soupape à billet lorsque ladite soupape à bille est engagée dans ledit siège de soupape à bille, est rendu excentrique par rapport à l'axe dudit perçage d'extrémité d'embout, et en ce qu'un canal est prévu sur un côté dudit espace formant chambre de soupape.
  2. Stylo à bille selon la revendication 1, dans lequel lesdits moyens qui permettent à ladite soupape à bille d'être espacée depuis une surface de paroi de ladite chambre de soupape et d'être maintenue de manière à ne pas bloquer le perçage d'extrémité dudit embout sont construits de telle façon que :
    l'axe dudit conduit est rendu coïncidant avec l'axe dudit perçage d'extrémité d'embout;
    une pluralité de nervures verticales, ayant chacune une hauteur différente, sont disposées dans des positions requises sur la paroi périphérique de ladite chambre de soupape de telle façon que l'axe d'un espace cylindrique défini par des surfaces au sommet desdites nervures est rendu excentrique par rapport à l'axe du perçage d'extrémité d'embout, et que des canaux définis par lesdites nervures sont adaptés à l'écoulement d'encre lorsque le stylo est orienté vers le bas; et
    une soupape qui a une forme sphérique au moins sur une surface qui vient en contact avec le conduit, est placée dans ledit espace cylindrique avec jeu en tant que soupape à bille.
  3. Stylo à bille selon l'une ou l'autre des revendications 1 et 2, dans lequel ledit joint est composé de :
    une partie de tube de serrage qui forme sa partie frontale et qui possède ledit perçage de montage d'embout et ladite chambre de soupape dans sa partie centrale axiale;
    une bride annulaire à l'extrémité postérieure de ladite partie de tube de serrage;
    une partie de tube de montage disposée dans l'arrière de ladite bride, pour recevoir à son extrémité arrière un réservoir d'encre et un fût ; et
    une pluralité de nervures verticales, ayant chacune une surface en oblique linéaire ou incurvée, disposée sur la périphérie de ladite partie de tube de serrage de manière à former une forme qui va en se rétrécissant, lesdites nervures étant connectées à ladite bride de telle manière que les extrémités postérieures desdites nervures soient sensiblement au même niveau que le diamètre extérieur de ladite bride ; et
    dans cet agencement, une pièce d'embouchure pour couvrir l'embout est fixée en butée contre ledit fût avec une partie en gradin à l'intérieur de la pièce d'embouchure située dans un bon contact franc avec lesdites nervures verticales.
  4. Stylo à bille selon l'une ou l'autre des revendications 1 et 2, dans lequel ledit réservoir d'encre est rempli avec une encre dite thixotropique (ayant pour propriété que sa viscosité au cisaillement décroít), qui présente une haute viscosité à l'état statique mais qui abaisse sa viscosité en raison du roulement d'une bille lors de l'écriture pour assurer un écoulement aisé de l'encre tandis qu'un élément suiveur qui se déplace en suivant la consommation de l'encre et qui présente pour propriété d'empêcher à l'encre de se vaporiser est prévu à l'extrémité arrière de l'encre remplie dans ledit réservoir d'encre.
  5. Stylo à bille selon la revendication 4, dans lequel ledit élément suiveur qui se déplace en suivant la consommation de l'encre est de nature grasse et qu'une pièce en résine ayant un poids spécifique sensiblement égal à celui dudit élément suiveur est immergée dans ledit élément suiveur.
  6. Stylo à bille selon la revendication 5, dans lequel ledit élément suiveur qui se déplace en suivant la consommation de l'encre est en un matériau gras transparent ou translucide rempli dans l'extrémité arrière du réservoir d'encre, et une pièce en résine colorée ayant un poids spécifique sensiblement égal à celui dudit élément suiveur est immergée dans ledit élément suiveur.
  7. Stylo à bille selon la revendication 3, dans lequel un passage de mise à l'air depuis un jeu au niveau d'une ouverture frontale de ladite pièce d'embouchure entre ledit embout qui a pénétré à travers celle-ci et le bord de l'ouverture est mis en communication au moyen de canaux définis entre lesdites nervures disposées sur la surface périphérique de ladite partie de tube de serrage et la surface intérieure de ladite pièce d'embouchure, et au moyen d'évidements formés au niveau de l'extrémité frontale du fut jusqu'à un espace intérieur à l'intérieur dudit fût ; un capuchon qui est engagé et fixé sur le fût frontal est formé de manière intégrée avec le capuchon intérieur pour recouvrir de manière hermétique ladite partie d'embout dans un petit espace ; un évent connecté depuis le côté d'introduction vers l'extrémité postérieure du capuchon est formé entre ledit capuchon et ledit capuchon intérieur ; et ledit capuchon intérieur est en outre pourvu d'une pièce d'étanchement élastique et non-absorbante réalisée avec un matériau en mousse à cellules fermées, afin de presser l'extrémité de l'embout.
  8. Stylo à bille selon l'une quelconque des revendications 1 à 7, dans lequel ledit conduit disposé dans l'arrière de ladite chambre de soupape communique avec ladite chambre dans la partie radialement centrale dudit siège de soupape à bille.
  9. Stylo à bille selon l'une quelconque des revendications 1 à 7, dans lequel ledit conduit disposé dans l'arrière de ladite chambre de soupape communique avec ladite chambre de soupape dans une partie décalée depuis le centre radial dudit siège de soupape à bille.
EP19940104220 1993-03-18 1994-03-17 Stylo-pointe-bille Expired - Lifetime EP0626276B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP12171/93U 1993-03-18
JP1993012171U JP2604349Y2 (ja) 1993-03-18 1993-03-18 ボールペン
JP31856/93U 1993-05-24
JP3185693U JPH0683380U (ja) 1993-05-24 1993-05-24 ボールペン

Publications (2)

Publication Number Publication Date
EP0626276A1 EP0626276A1 (fr) 1994-11-30
EP0626276B1 true EP0626276B1 (fr) 1998-10-07

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DE (1) DE69413744T2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3105711B2 (ja) * 1993-08-31 2000-11-06 三菱鉛筆株式会社 ゲル状物と固形物を併用する水性ボールペン用インキ追従体
EP0685348B1 (fr) * 1993-12-06 2000-04-05 Mitsubishi Pencil Kabushiki Kaisha Stylo a bille
US5678942A (en) * 1995-02-28 1997-10-21 Mitsubishi Pencil Kabushiki Kaisha Ball-point pen
JP3929571B2 (ja) * 1997-10-15 2007-06-13 パイロットインキ株式会社 筆記具
JP4028886B2 (ja) * 1997-12-03 2007-12-26 株式会社サクラクレパス 塗布具のインキ逆流防止機構
FR2785569B1 (fr) * 1998-11-09 2001-01-26 Bima 83 Piston suiveur d'encre pour stylo a bille et son procede de fabrication
US6554521B1 (en) 1999-09-14 2003-04-29 Sakura Color Products Corporation Applicator
FR2785570B1 (fr) * 1999-10-08 2001-02-09 Bima 83 Piston suiveur d'encre pour stylo a bille
JP4402895B2 (ja) * 2003-03-26 2010-01-20 株式会社パイロットコーポレーション 水性ボールペン用インキとこれを用いた水性ボールペン
ATE484399T1 (de) * 2003-08-25 2010-10-15 Mitsubishi Pencil Co Schreibgerät

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE484827A (fr) * 1947-04-02
FR1056717A (fr) * 1952-05-21 1954-03-02 Organe combiné d'écriture à bille à écriture variable
FR1497176A (fr) * 1966-10-20 1967-10-06 Paper Mate Mfg Co Dispositif obturateur destiné à suivre le niveau d'encre d'une cartouche
JPS574373U (fr) * 1980-06-10 1982-01-09
BR8507165A (pt) * 1985-01-23 1987-07-14 Gillette Co Instrumento esferografico contendo uma composicao de tinta aquosa
JPH052067Y2 (fr) * 1987-06-03 1993-01-19

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DE69413744T2 (de) 1999-06-02
DE69413744D1 (de) 1998-11-12
EP0626276A1 (fr) 1994-11-30

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