WO2000003881A1 - Appareil permettant le depot de liquides, en particulier pour ecrire - Google Patents

Appareil permettant le depot de liquides, en particulier pour ecrire Download PDF

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Publication number
WO2000003881A1
WO2000003881A1 PCT/EP1999/004952 EP9904952W WO0003881A1 WO 2000003881 A1 WO2000003881 A1 WO 2000003881A1 EP 9904952 W EP9904952 W EP 9904952W WO 0003881 A1 WO0003881 A1 WO 0003881A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
housing
liquid supply
capillary
region
Prior art date
Application number
PCT/EP1999/004952
Other languages
German (de)
English (en)
Inventor
Rainer Kaufmann
Original Assignee
Dataprint R. Kaufmann Gmbh
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 Dataprint R. Kaufmann Gmbh filed Critical Dataprint R. Kaufmann Gmbh
Priority to EP99936528A priority Critical patent/EP1097047A1/fr
Publication of WO2000003881A1 publication Critical patent/WO2000003881A1/fr

Links

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

Definitions

  • the invention relates to a device for applying liquids, in particular a writing instrument, according to the preamble of claim 1.
  • a generic writing instrument in which the housing has a partition wall through which a capillary liquid conductor connects the liquid supply to the capillary writing tip.
  • a buffer store is formed around the capillary liquid conductor, which temporarily holds liquid, which emerges from the liquid supply when the negative pressure in the liquid supply decreases, for example as a result of heating.
  • the air supply to the liquid supply takes place through the capillaries of the capillary liquid conductor, which capillaries have the least capillarity.
  • the invention has for its object to provide a device with a simplified structure for applying liquids, in particular a writing instrument, in which the need for a buffer store for temporarily holding liquid in the event of pressure fluctuations or temperature changes is eliminated.
  • FIG. 1 shows a detailed view of the writing instrument of FIG. 1,
  • Fig. 3 is a detailed view of a modified embodiment of the writing instrument according to Fig. 1 and
  • FIG. 4 shows a detailed view of a further, modified embodiment of the writing instrument according to FIG. 1.
  • a writing instrument has an overall cylindrical housing 2 which tapers conically at its front end and has a channel 4 which is completely filled with a capillary writing tip 6.
  • the capillary writing tip 6 can be, for example, a wick or a prefabricated plastic molded part with continuous pores or capillaries.
  • the capillaries of the capillary writing tip 6 have different capillarities due to their dimensions and / or due to different surface properties.
  • the height of rise up to which the liquid used for the writing instrument rises into the respective capillary is defined as capillarities or capillary forces.
  • the liquid supply 10 is delimited by a piston 12 which is tightly guided in the housing 2 and which borders on the one hand on the liquid supply 10 and on the other on the environment or the ambient pressure.
  • the frictional force between the piston 12 and the housing 2 is greater than the weight of the liquid column which pulls on the piston 12 when the device is held down with the capillary writing tip 6, so that no liquid emerges from the writing tip 6.
  • the device If the device is used for writing, liquid is sucked out of the liquid supply 10 through the writing tip 6 by forces acting between the writing tip 6 and a base to be written on. This creates a negative pressure ⁇ p in the liquid supply, as a result of which the piston 12 moves to the left in accordance with FIG. 1 and compensates for the decrease in volume of the liquid chamber 8.
  • the size of the negative pressure ⁇ p which is necessary to move the piston 12 is such that this negative pressure is smaller than the capillary force of the capillary or pore of the writing tip 6 which has the least capillarity. If this were not the case, the negative pressure within the liquid chamber 8 would suck air into the liquid chamber 8 through the capillary with the least capillarity of the writing tip 6. Exactly this is to be avoided with the device according to the invention, however, so that the difficulties arising in known writing instruments in which the liquid storage space has to be ventilated are avoided.
  • the force for moving the piston 12 is thus matched to the writing instrument in such a way that it is greater than the weight of the liquid column pulling on the piston 12 when the instrument is held vertically, but is smaller than the capillary force of the "weakest" capillary of the writing tip 6.
  • FIG. 2 shows details of an advantageous embodiment of the device of FIG. 1, in particular the piston 12.
  • the piston 12 is generally pot-shaped and has a cylinder wall region 14 and a bottom 16. At the front end of the cylinder wall area 14, a ring area 18 starting from a bead is formed, which is sealed on the inside of the housing 2. leads is. In the area of the bottom 16, another bead-shaped ring area 20 is formed, which is guided on the housing 2 and has grooves 21, via which an annular space 22 formed between the piston 12 and the housing 2 has a space 24 of the housing 2 acted upon by ambient pressure Back of the piston 12 is connected.
  • the function of the piston 12 is as follows:
  • this pressure difference ⁇ p is effective at the cylinder wall area 14, as a result of which the elastically designed cylinder wall area 14 deforms and the contact force between the ring area 18 and the inner wall of the housing 2 decreases. As a result of the decrease in contact force, the frictional force decreases.
  • the piston 12 can move to the left as a result of the negative pressure ⁇ p, which also acts on the base 16. If the negative pressure decreases, the frictional force increases, which increases the holding force of the piston.
  • the rear end of the housing 2 is closed with a plug 26 through which a helical, capillary air inlet duct 28 leads.
  • the capillarity of the air inlet channel 28 is advantageously smaller than that of the capillary of the writing tip 6 which is designed with the least capillarity.
  • Fig. 3 shows a modified embodiment of a piston and the application of ambient pressure to the piston rear.
  • the piston 12 of FIG. 3 is like the piston of FIG. 2 also with a
  • Cylinder wall region 14 and a rear floor 16 are formed.
  • the piston 12 in FIG. 3 has a rigid front wall
  • the sealing ring region 34 formed outside the front wall 30 is designed as a lip seal, the sealing lip pointing to the side facing away from the liquid supply.
  • the annular region 36 which is formed in the rear region of the piston 12 and lies against the inner wall of the housing, serves to change the frictional force as a function of pressure.
  • the ring region 36 in turn has grooves 21. via which the annular space 22 is connected to the rear of the piston 12.
  • the function of the piston 12 according to FIG. 3 is as follows: If a vacuum ⁇ p arises in the liquid reservoir 10, the resiliently designed bottom 16 is deformed and the resiliently designed cylinder wall region 14 is deformed in such a way that the contact force between the ring region 36 and the housing inner wall decreases. whereby the frictional force of the piston 12 decreases overall and the piston can move to the left according to FIG. 3.
  • the negative pressure in the liquid supply 10 ceases. increases the contact force of the annular region 36 on the housing inner wall, so that the holding force of the piston 12 is increased.
  • the sealing force in the region 34 does not change or changes only insignificantly ( ⁇ p is effective on the sealing lip).
  • the rear side of the piston 12 is not directly connected to the environment, but a bellows 40 is attached to a stopper 38, which closes the housing 2, via which a volume or Pressure equalization takes place.
  • a passage 42 leads through the plug 38 into the interior of the bellows 40.
  • Fig. 4 shows a further modified embodiment.
  • the piston 12 is designed with an overall H-shaped cross section, a front ring region 44 in turn being sealingly guided on the housing 2 and a rear ring region 46 having grooves which vent the annular space 22.
  • the ring areas 44 and 46 are at the end of bent conical areas of the Piston 12 formed, each pointing obliquely outwards.
  • the normal function i.e. the decrease in the frictional force at negative pressure in the liquid supply 10 corresponds to that of FIG. 2; at negative pressure in the liquid supply 10, the frictional force of the ring area 44 decreases.
  • the housing 2 is provided at its rear end with a rubber stopper 48 with a passage 42, the rubber stopper 48 being designed with an oversize, so that, for example, impacts occurring when the device falls down are reduced.
  • the device according to the invention can be modified and / or supplemented in a variety of ways.
  • the parts of the piston which are in engagement with one another and the inner wall of the housing can be provided with rough surfaces which increase the static friction, for example with surfaces which are provided with micro hairs which are approximately perpendicular to the direction of movement of the piston, in order to increase the static friction and the sliding friction in one to reduce even slight geometric deformation of the piston.
  • the writing tip 6 can be replaced by other writing tips, including brushes, etc.
  • the shape of the housing 2 can also be modified in a variety of ways. Likewise the Geometric design of the piston, the material stiffness being chosen so that the basic functions are retained.
  • the piston is matched to the described requirements by selection of material and material thickness and, if appropriate, by coatings.
  • the piston can consist of homogeneous plastic, fiber composite material or a material with an embedded metal membrane.

Landscapes

  • Pens And Brushes (AREA)

Abstract

Appareil permettant le dépôt de liquides, en particulier pour écrire, qui comporte une réserve de liquide (10) contenue dans un réservoir (2). Ladite réserve de liquide est adjacente à une pointe (6) d'écriture capillaire faisant saillie par rapport au réservoir et à un piston (12) mobile se trouvant dans le réservoir et soumis à l'action de la pression environnante. Ledit appareil est caractérisé par le fait que la force de frottement agissant entre le piston (12) et le réservoir (2) est plus forte que le poids, agissant sur le piston, de la colonne de liquide qui se trouve entre le piston et la pointe (6) d'écriture capillaire, et plus faible que la force capillaire des passages capillaires présentant la capillarité la plus minime de la pointe d'écriture.
PCT/EP1999/004952 1998-07-16 1999-07-13 Appareil permettant le depot de liquides, en particulier pour ecrire WO2000003881A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99936528A EP1097047A1 (fr) 1998-07-16 1999-07-13 Appareil permettant le depot de liquides, en particulier pour ecrire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19832046.9 1998-07-16
DE1998132046 DE19832046A1 (de) 1998-07-16 1998-07-16 Gerät zum Auftragen von Flüssigkeiten, insbesondere Schreibgerät

Publications (1)

Publication Number Publication Date
WO2000003881A1 true WO2000003881A1 (fr) 2000-01-27

Family

ID=7874318

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/004952 WO2000003881A1 (fr) 1998-07-16 1999-07-13 Appareil permettant le depot de liquides, en particulier pour ecrire

Country Status (3)

Country Link
EP (1) EP1097047A1 (fr)
DE (1) DE19832046A1 (fr)
WO (1) WO2000003881A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105890677A (zh) * 2016-04-28 2016-08-24 山东省计量科学研究院 一种小微气体流量发生器
US10414201B2 (en) 2017-11-10 2019-09-17 Sdi Corporation Pressure regulating device for writing tool and writing tool having the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6416242B1 (en) 1993-11-12 2002-07-09 Dataprint R. Kaufmann Gmbh Efficient fluid dispensing utensil
DE19529865C2 (de) 1995-08-14 2002-02-28 Kaufmann R Dataprint Gerät zum Auftragen von Flüssigkeiten auf eine Unterlage mittels eines Auftragselements
US6457892B1 (en) 2001-04-20 2002-10-01 Avery Dennison Corporation Writing instrument having a capillary hole through the container
US6637965B1 (en) 2001-06-22 2003-10-28 Avery Dennison Corporation Writing instrument having a reservoir between a tip and a capillary storage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397939A (en) * 1966-09-14 1968-08-20 Carter S Ink Co Marking instrument
EP0240994A1 (fr) * 1986-04-10 1987-10-14 Jiro Hori Dispositif d'application d'un liquide du genre stylo
EP0476492A1 (fr) * 1990-09-11 1992-03-25 Jiro Hori Marqueur
DE4115685C2 (de) 1991-05-14 1995-01-26 Dataprint Datendrucksysteme R Schreibgerät mit in einem Behälter frei aufgenommener Schreibflüssigkeit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1297512B (de) * 1965-11-15 1969-06-12 Mittenwald Chemie Kg Schreibgeraet mit einem kapillaren Docht
DE1984491U (de) * 1967-11-21 1968-04-25 Rou Bill Fabrik Fuer Schreibge Kugelschreibermine.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397939A (en) * 1966-09-14 1968-08-20 Carter S Ink Co Marking instrument
EP0240994A1 (fr) * 1986-04-10 1987-10-14 Jiro Hori Dispositif d'application d'un liquide du genre stylo
EP0476492A1 (fr) * 1990-09-11 1992-03-25 Jiro Hori Marqueur
DE4115685C2 (de) 1991-05-14 1995-01-26 Dataprint Datendrucksysteme R Schreibgerät mit in einem Behälter frei aufgenommener Schreibflüssigkeit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105890677A (zh) * 2016-04-28 2016-08-24 山东省计量科学研究院 一种小微气体流量发生器
CN105890677B (zh) * 2016-04-28 2021-11-02 山东省计量科学研究院 一种小微气体流量发生器
US10414201B2 (en) 2017-11-10 2019-09-17 Sdi Corporation Pressure regulating device for writing tool and writing tool having the same

Also Published As

Publication number Publication date
DE19832046A1 (de) 2000-02-03
EP1097047A1 (fr) 2001-05-09

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