EP1699641B1 - Ball-point pen with means of preventing inclination of the straight portion of the ball-pressing spring - Google Patents
Ball-point pen with means of preventing inclination of the straight portion of the ball-pressing spring Download PDFInfo
- Publication number
- EP1699641B1 EP1699641B1 EP04801415A EP04801415A EP1699641B1 EP 1699641 B1 EP1699641 B1 EP 1699641B1 EP 04801415 A EP04801415 A EP 04801415A EP 04801415 A EP04801415 A EP 04801415A EP 1699641 B1 EP1699641 B1 EP 1699641B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ball
- point pen
- straight portion
- capillary channel
- longitudinal axis
- 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.)
- Not-in-force
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K1/00—Nibs; Writing-points
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K7/00—Ball-point pens
- B43K7/10—Arrangements for feeding ink to the ball points
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K1/00—Nibs; Writing-points
- B43K1/08—Nibs; Writing-points with ball points; Balls or ball beds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K1/00—Nibs; Writing-points
- B43K1/08—Nibs; Writing-points with ball points; Balls or ball beds
- B43K1/086—Nibs; Writing-points with ball points; Balls or ball beds with resilient supporting means for the ball, e.g. springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K7/00—Ball-point pens
Definitions
- the present invention relates to the technical sector of ball-point pens.
- these pens comprise an ink reservoir which communicates with a usually cylindrical hole connected to the capillary channel of a tip which has a cavity inside which the ball for writing is seated.
- This ball when the pen is not writing, is kept pressed against a retaining edge, which is also formed on the said tip, in order to prevent the ink from escaping, and this function is performed by a compression-resilient spring which presses on the ball by means of the free end of a straight portion with which the said spring terminates.
- the abovementioned ball is pressed towards the inside of the tip and, overcoming the resistance of the spring, is displaced from the retaining edge by an amount sufficient to allow the ink used for writing to pass outside.
- the abovementioned straight portion of the spring also has a very small diameter (of the order of a few tenths of a millimetre) and, when it is pressed axially during writing, it frequently slides on the surface of the ball, flexing with respect to the remaining part of the spring, and, being deviated from the initial position coinciding with the longitudinal axis of the ball-point pen, is positioned with the free end arranged on a side point of the ball situated in the vicinity of the said retaining edge.
- the straight portion of the spring exerts on the ball, during writing, a force which has a considerable transverse component which keeps the said ball pressed transversely against the retaining edge and, since play is necessarily present between the latter and the ball, the annular cross section through which the ink flows out is not symmetrical with respect to the axis of the pen, having a length which, instead of being constant, varies from zero to a maximum value proceeding circumferentially around the ball, reaching at said maximum value a size which allows the ink to flow out at a rate greater than the flowrate envisaged during the design stage, which flowrate is calculated according to the viscosity of the ink and a uniform width of the annular flow cross section.
- the ink in the region of the abovementioned blotches, the ink, forming zones which have a greater than normal thickness, is unable to dry rapidly and, if inadvertently one brushes against said blotches with one's hand or arm, the result is to cause them to spread, producing unaesthetic smears and also dirtying one's hand or arm.
- the inventor of the subject of the present application has aimed to provide a solution to the problem described hitherto and has devised a ball-point pen of the type described above, where the said capillary channel, through which the said straight portion of the ball-pressing spring passes, is provided with means able to prevent this portion from inclining with respect to the longitudinal axis of the pen.
- these means consist of enlarged portions which create a narrow section of the capillary channel inside which the said straight portion of the spring is inserted in an approximately complementary manner with a minimum amount of play.
- a ball-point pen 101 comprises an ink reservoir (only a small part of which is schematically shown) communicating with a cylindrical hole 10 connected to a capillary channel 3 of a tip 4 which is provided with a cavity 9 which seats the ball 5 for writing and inside which the said capillary channel 3 terminates.
- This ball is kept pressed against a retaining edge 9t formed on the contour towards the outside of the said cavity 9, by the thrust exerted by a compression-resilient spring 6 which terminates in a straight portion 6r aligned with the longitudinal axis M-M of the ball-point pen 101, the free end 6p of which (shown in continuous lines) is in contact with the ball 5.
- This straight portion 6r passes coaxially through a cylindrical capillary channel 3 and, when the ball-point pen 101 is used for writing, as shown in the figure, the force Q acting on the ball 5 is transmitted to it at a point P and causes flexing thereof with respect to the point 0 where the straight portion 6r is connected to the remaining parts of the spring 6, causing it to incline (to the right in the drawing) with respect to the said axis M-M.
- Figure 3 shows how, in a second example of embodiment 11 of the ball-point pen according to the invention, all the various component parts mentioned in the description of the first example of embodiment are identical (and for this reason are indicated by the same reference numbers), except for the said narrow section 7' which, in this case, does not consist of a cylindrical restriction, but is formed, inside the capillary channel 3, by means of a ring 12 which has a. semi-circular cross section projecting inwards and has an axis coinciding with the longitudinal axis N-N of the ball-point pen 11.
- the said narrow sections 7, 7' irrespective of their form, keep substantially fixed, i.e. oriented along the longitudinal axis N-N of the ball-point pen 1, 11, the straight portion 6r of the spring 6, the free end 6p of which therefore always presses axially on the ball 5 in a substantially central position, avoiding the abovementioned drawbacks.
Landscapes
- Pens And Brushes (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
Description
- The present invention relates to the technical sector of ball-point pens. As is known, for example in
US-A- 6 220 774 , these pens comprise an ink reservoir which communicates with a usually cylindrical hole connected to the capillary channel of a tip which has a cavity inside which the ball for writing is seated. - This ball, when the pen is not writing, is kept pressed against a retaining edge, which is also formed on the said tip, in order to prevent the ink from escaping, and this function is performed by a compression-resilient spring which presses on the ball by means of the free end of a straight portion with which the said spring terminates. When the pen is used, being pressed against the surface on which it must write, the abovementioned ball is pressed towards the inside of the tip and, overcoming the resistance of the spring, is displaced from the retaining edge by an amount sufficient to allow the ink used for writing to pass outside.
- Since the dimensions of the various component parts named hitherto are, as is known, very small, the abovementioned straight portion of the spring also has a very small diameter (of the order of a few tenths of a millimetre) and, when it is pressed axially during writing, it frequently slides on the surface of the ball, flexing with respect to the remaining part of the spring, and, being deviated from the initial position coinciding with the longitudinal axis of the ball-point pen, is positioned with the free end arranged on a side point of the ball situated in the vicinity of the said retaining edge.
- In this position, the straight portion of the spring exerts on the ball, during writing, a force which has a considerable transverse component which keeps the said ball pressed transversely against the retaining edge and, since play is necessarily present between the latter and the ball, the annular cross section through which the ink flows out is not symmetrical with respect to the axis of the pen, having a length which, instead of being constant, varies from zero to a maximum value proceeding circumferentially around the ball, reaching at said maximum value a size which allows the ink to flow out at a rate greater than the flowrate envisaged during the design stage, which flowrate is calculated according to the viscosity of the ink and a uniform width of the annular flow cross section.
- The above causes the appearance, along the writing lines, of blotches which are randomly arranged, creating an unaesthetic effect which is automatically associated with a poor quality of the pen.
- Moreover, in the region of the abovementioned blotches, the ink, forming zones which have a greater than normal thickness, is unable to dry rapidly and, if inadvertently one brushes against said blotches with one's hand or arm, the result is to cause them to spread, producing unaesthetic smears and also dirtying one's hand or arm.
- The inventor of the subject of the present application has aimed to provide a solution to the problem described hitherto and has devised a ball-point pen of the type described above, where the said capillary channel, through which the said straight portion of the ball-pressing spring passes, is provided with means able to prevent this portion from inclining with respect to the longitudinal axis of the pen.
- In certain embodiments of the invention, these means consist of enlarged portions which create a narrow section of the capillary channel inside which the said straight portion of the spring is inserted in an approximately complementary manner with a minimum amount of play.
- The subject of the present invention therefore consists of a ball-point pen as described in the accompanying
Claim 1. A more detailed description of two preferred embodiments of the ball-point pen according to the invention will now be provided, with reference also to the accompanying drawings in which: -
Figure 1 is an enlarged longitudinal cross section through some parts of a ball-point pen designed in accordance with the present state of the art, while it is being used for writing; -
Figure 2 is an enlarged longitudinal cross section through some parts of a first example of embodiment of a ball-point pen according to the invention; -
Figure 3 is an enlarged longitudinal cross section through some parts of a second example of embodiment of a ball-point pen according to the invention. - If we consider
Figure 1 , it can be seen therein how a ball-point pen 101 according to the state of the art comprises an ink reservoir (only a small part of which is schematically shown) communicating with acylindrical hole 10 connected to acapillary channel 3 of atip 4 which is provided with acavity 9 which seats theball 5 for writing and inside which the saidcapillary channel 3 terminates. - This ball is kept pressed against a
retaining edge 9t formed on the contour towards the outside of the saidcavity 9, by the thrust exerted by a compression-resilient spring 6 which terminates in astraight portion 6r aligned with the longitudinal axis M-M of the ball-point pen 101, thefree end 6p of which (shown in continuous lines) is in contact with theball 5. Thisstraight portion 6r passes coaxially through a cylindricalcapillary channel 3 and, when the ball-point pen 101 is used for writing, as shown in the figure, the force Q acting on theball 5 is transmitted to it at a point P and causes flexing thereof with respect to the point 0 where thestraight portion 6r is connected to the remaining parts of thespring 6, causing it to incline (to the right in the drawing) with respect to the said axis M-M. - Consequently, from that moment onwards, the
straight portion 6r exerts on the ball 5 a non-axial reactive force which has a significant component in the transverse direction which causes the disadvantageous effects described above. - In
Figure 2 , instead, it can be seen how, in a first example ofembodiment 1 of a ball-point pen according to the invention, the phenomenon described above is avoided by creating in the capillary channel 3 a cylindricalnarrow section 7 which has an axis coinciding with the longitudinal axis N-N of the pen, is passed through by thestraight portion 6r of thespring 6 and has dimensions and a shape which practically complement that of the latter (apart from a very small amount of play - accentuated in the drawing - which is left to allow for any thermal expansion of the material from which thespring 6 is made, which differs slightly from the thermal expansion of the material from which thetip 4 is made). Since, in the situation illustrated above, there could be an obstruction in the flow of the ink through the saidnarrow section 7, which is partially occluded by thestraight portion 6r of thespring 6, the inventor has envisaged the possibility of forming one or more radial through-grooves 8i which connect theaforementioned cavity 9 seating theball 5 to the said hole with which theink reservoir 2 communicates. -
Figure 3 shows how, in a second example ofembodiment 11 of the ball-point pen according to the invention, all the various component parts mentioned in the description of the first example of embodiment are identical (and for this reason are indicated by the same reference numbers), except for the said narrow section 7' which, in this case, does not consist of a cylindrical restriction, but is formed, inside thecapillary channel 3, by means of aring 12 which has a. semi-circular cross section projecting inwards and has an axis coinciding with the longitudinal axis N-N of the ball-point pen 11. - In both the cases illustrated in
Figures 2 and3 , the saidnarrow sections 7, 7', irrespective of their form, keep substantially fixed, i.e. oriented along the longitudinal axis N-N of the ball-point pen straight portion 6r of thespring 6, thefree end 6p of which therefore always presses axially on theball 5 in a substantially central position, avoiding the abovementioned drawbacks. - With a ball-point pen according to the invention, it has therefore been possible to achieve the predefined object of the inventor, namely that of providing a ball-point pen with writing lines which are more uniform and without the formation of blotches and/or ragged edges.
Claims (5)
- Ball-point pen (1, 11) comprising a reservoir (2) communicating with a hole (10) connected to a capillary channel (3) of a tip (4) which is provided with a cavity (9) which seats the ball (5) for writing, this ball (5) being kept pressed against a retaining edge (9t) of the abovementioned cavity (9) as a result of the thrust of a compression-resilient spring (6) terminating in a straight portion (6r), the free end (6p) of which is in contact with the said ball (5), characterized in that the straight portion is aligned with the longitudinal axis (N-N) of the ball-point pen (1) and said capillary channel (3) has, inside it, means (7, 7') which, coming into contact with the said straight portion (6r) of the spring (6), prevent it from becoming inclined with respect to the said longitudinal axis (N-N) of the ball-point pen (1).
- Ball-point pen according to Claim 1, characterized in that the said capillary channel (3) has a narrow section (7, 7') which, being passed through in the axial direction by the said straight portion (6r) of the spring (6), is designed with dimensions such as to contain said portion in an approximately complementary manner with a minimum amount of play, substantially preventing it from assuming inclined positions with respect to the abovementioned longitudinal axis (N-N).
- Ball-point pen according to Claim 2, in which one or more through-grooves (8i) are formed in the region of the said narrow section (7), said through-grooves connecting the cavity (9) inside which the said ball is seated to the hole (10) with which the said reservoir (2) communicates.
- Ball-point pen according to either one of Claims 2 or 3, in which the said narrow section is formed by a cylindrical shaped restriction (7).
- Ball-point pen according to either one of Claims 2 or 3, in which the said narrow section is defined by a ring (12) with a semi-circular cross section projecting towards the inside of the capillary channel (3) having its axis coinciding with the longitudinal axis (N-N) of the ball-point pen (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH02222/03A CH696635A5 (en) | 2003-12-29 | 2003-12-29 | Ballpoint pen has capillary channel with cylindrical narrow section which on coming in contact with straight portion of spring, prevents it from being inclined with respect to longitudinal axis of pen |
PCT/IB2004/004200 WO2005065967A1 (en) | 2003-12-29 | 2004-12-16 | Ball-point pen with means of preventing inclination of the straight portion of the ball-pressing spring |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1699641A1 EP1699641A1 (en) | 2006-09-13 |
EP1699641B1 true EP1699641B1 (en) | 2008-07-09 |
Family
ID=34744488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04801415A Not-in-force EP1699641B1 (en) | 2003-12-29 | 2004-12-16 | Ball-point pen with means of preventing inclination of the straight portion of the ball-pressing spring |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1699641B1 (en) |
JP (1) | JP4737554B2 (en) |
KR (1) | KR101169482B1 (en) |
CN (1) | CN100445106C (en) |
AT (1) | ATE400452T1 (en) |
CH (1) | CH696635A5 (en) |
DE (1) | DE602004014977D1 (en) |
ES (1) | ES2309585T3 (en) |
HK (1) | HK1102923A1 (en) |
WO (1) | WO2005065967A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5186934B2 (en) * | 2008-01-31 | 2013-04-24 | ぺんてる株式会社 | Ballpoint pen tip |
JP5372446B2 (en) * | 2008-09-19 | 2013-12-18 | 株式会社パイロットコーポレーション | Ballpoint pen tip |
JP6189054B2 (en) * | 2013-02-28 | 2017-08-30 | ゼブラ株式会社 | Ballpoint pen tip and ballpoint pen |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08118896A (en) * | 1994-10-19 | 1996-05-14 | Mitsubishi Pencil Co Ltd | Tip correcting pen |
JP3434975B2 (en) * | 1996-06-03 | 2003-08-11 | 三菱鉛筆株式会社 | Ballpoint pen |
JPH10236055A (en) * | 1997-02-25 | 1998-09-08 | Mitsubishi Pencil Co Ltd | Ballpoint pen |
JPH10264577A (en) * | 1997-03-25 | 1998-10-06 | Mitsubishi Pencil Co Ltd | Refill for ballpoint pen |
TW490401B (en) * | 1998-08-21 | 2002-06-11 | Pilot Kk | Retractable type ballpoint pen |
US6220774B1 (en) * | 2000-05-03 | 2001-04-24 | Kotobuki & Co., Ltd. | Ballpoint tip for ballpoint liquid container |
JP4665342B2 (en) * | 2001-05-31 | 2011-04-06 | ぺんてる株式会社 | Ballpoint pen or applicator tip |
JP4101499B2 (en) * | 2001-10-31 | 2008-06-18 | パイロットインキ株式会社 | Ballpoint pen |
JP4436589B2 (en) | 2002-03-29 | 2010-03-24 | 株式会社サクラクレパス | Chip for applicator |
-
2003
- 2003-12-29 CH CH02222/03A patent/CH696635A5/en not_active IP Right Cessation
-
2004
- 2004-12-16 JP JP2006546375A patent/JP4737554B2/en not_active Expired - Fee Related
- 2004-12-16 CN CNB2004800390609A patent/CN100445106C/en not_active Expired - Fee Related
- 2004-12-16 ES ES04801415T patent/ES2309585T3/en active Active
- 2004-12-16 AT AT04801415T patent/ATE400452T1/en not_active IP Right Cessation
- 2004-12-16 DE DE602004014977T patent/DE602004014977D1/en active Active
- 2004-12-16 EP EP04801415A patent/EP1699641B1/en not_active Not-in-force
- 2004-12-16 WO PCT/IB2004/004200 patent/WO2005065967A1/en active IP Right Grant
- 2004-12-16 KR KR1020057021395A patent/KR101169482B1/en not_active IP Right Cessation
-
2007
- 2007-07-09 HK HK07107346.9A patent/HK1102923A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ES2309585T3 (en) | 2008-12-16 |
HK1102923A1 (en) | 2007-12-07 |
JP4737554B2 (en) | 2011-08-03 |
KR101169482B1 (en) | 2012-07-27 |
CH696635A5 (en) | 2007-08-31 |
JP2007516872A (en) | 2007-06-28 |
ATE400452T1 (en) | 2008-07-15 |
CN100445106C (en) | 2008-12-24 |
KR20060114290A (en) | 2006-11-06 |
DE602004014977D1 (en) | 2008-08-21 |
CN1898093A (en) | 2007-01-17 |
EP1699641A1 (en) | 2006-09-13 |
WO2005065967A1 (en) | 2005-07-21 |
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