JP2008179098A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent ink from accumulating in a space between a pen point and an ink relay tube and also, restrain an ink leakage. <P>SOLUTION: This writing utensil is structured of the ink relay tube 4 and a tube cover 5 attached to the former, and the tube cover 5 is of such an external shape that it is fitted to the outer periphery of the ink relay tube 4 between the pen point 3 and the ink relay tube 4 and joined to the inner periphery of the pen point 3 at least, on the apex side of the pen point 3. Further, the tube cover is packed in a space between the pen point 3 and the ink relay tube 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a writing instrument, and more particularly to a writing instrument having a conical nib.

A writing instrument provided with this type of nib is described in Patent Document 1. In the writing instrument of Document 1, the pen tip includes a nib base body and a converging member. The nib base body is formed with a cylindrical base and a circular arc in a cross section continuously from one end thereof, and is formed by providing slit-like grooves between each other at equal intervals on the circumference of the axis. It is composed of 5 to 8 comb-like pieces having a hemispherical division formed at the tip. The converging member is made of a metal pipe that can be fitted on the outer periphery of the nib base body, and by inserting the pipe into the nib base body, each comb-like piece is gradually reduced in diameter toward the tip. When converged into a shape, a hemispherical brush tip is formed at the tip, and an ink lead-out path is formed between each comb-like piece. Then, an ink relay core having a capillary force is inserted into the tip of the pen nib (basic nib body), and the ink relay core is integrally fixed to the tip of the pen shaft. Connected to the ink tank. The pen tip constructed in this way can be written in multiple directions with respect to the paper surface, and even if it rotates around the pen axis, it can be written from any position and from any angle, depending on the strength of the writing pressure, Various forms of characters can be written by changing the width of the line, such as a thick line or a thin line.
JP-A-9-156279

  However, with a writing instrument that uses this type of conical nib, there is a space between the nib, that is, between the nib and the ink relay core. If left in a downward state, the ink is moved into the nib (the space between the nib and the ink relay core by the action of the gravity of the ink and the capillary force of the nib (the ink outlet path) and the ink relay core. ) And the ink tank is close to the maximum capacity, there is no (or small) expansion of air due to temperature and pressure changes, and there is no ink leakage, but the ink is not ink. When the pressure is reduced to less than half of the tank, there is a problem that the ink tank expands due to temperature change or pressure change, and ink leakage may occur due to the pressure.

  The present invention solves such a conventional problem. In this type of writing instrument, an object of the present invention is to prevent ink from accumulating in the space between the pen tip and the ink relay core and to prevent ink leakage. And

  In order to achieve the above object, the writing instrument of the present invention is connected to the ink tank via a pen shaft having an ink tank for storing ink and an ink relay core fixed to the tip of the pen shaft and having capillary force. The pen tip is provided with a base portion formed in a cylindrical shape, one end side of the base portion, the tip end is substantially hemispherical, and the whole is gradually cone-shaped toward the tip end. A plurality of comb-like pieces converged into a shape, a brush tip at the tip, and a conical pen-tip shape having an ink lead-out path between the comb-like pieces, in the hollow of the pen tip In the writing instrument in which the ink relay core is inserted, the ink relay core includes a core cover, and the core cover is attached to the outer periphery of the ink relay core between the pen tip and the ink relay core. At least at the tip side of the nib It has an outer shape in close contact with the inner periphery of the gist to be filled in the space between the pen tip and the ink supply wick. In this case, the pen tip is preferably formed of a plastic material, a metal material, a ceramic material, or a combination thereof. Further, the core cover is formed of an elastic material, is compressed and deformed to the inner periphery of the pen tip, and is at least between the contact portion pressed against the inner surface of each comb-like piece on the tip side and each comb-like piece. It is preferable to have the bulging part extruded.

  In the writing instrument of the present invention, the lead cover is mounted on the outer periphery of the ink relay core between the pen tip and the ink relay core, and is in close contact with the inner periphery of the pen tip at least at the tip end side of the pen tip. Since the space between the nib and the ink relay core is filled, it is possible to prevent ink from being accumulated in the space between the nib and the ink relay core, and to prevent ink leakage reliably. Since the outer periphery of the ink relay core is surrounded by the core cover between the nib and the ink relay core, it is possible to reliably prevent the pen tip (ink relay core) from drying up when the cap is off. It has the effect.

  An embodiment of the present invention will be described below with reference to FIG. 1 and with reference to FIGS. 2 to 4 as necessary. FIG. 1 shows a main part of the writing instrument. As shown in FIG. 1, the writing instrument 1 includes a pen shaft 2 and a pen tip 3, and the pen tip 3 is connected to ink stored in the pen shaft 2 by an ink relay core 4 having a capillary force.

  The pen shaft 2 is formed of a plastic material into a cylindrical shape such as a cylindrical shape, and a mouthpiece (a (circular) cylindrical mouth for fixing the pen tip 3) 20 is attached to the tip, and the rear end is sealed. The shaft cylinder 21 is stopped, and an ink tank (not shown, the same applies hereinafter) formed integrally in the shaft cylinder 21. In the case of this pen shaft 2, the pen tip 3 is inserted into the mouthpiece 20 at the tip of the shaft cylinder 21, and the ink relay core 4 is inserted and arranged at the tip side inside the shaft cylinder 21. It is provided in the range. In the ink tank, a form in which ink is directly filled or a form in which the ink is held in an ink storage member such as a synthetic fiber converging body is adopted to store the ink. A cap (not shown) is attached to the tip end side of the shaft cylinder 21 from above the pen tip 3. In this case, the cap is formed in a cylindrical shape such as a cylindrical shape having an opening at the rear end and sealed at the front end by a plastic material, and a cylindrical shape that hermetically surrounds the pen tip inside the cylindrical shape. It has a double cylindrical structure in which a holding member having a shape is integrally provided.

  As shown in FIG. 2, the nib 3 includes a plurality of comb-like pieces 31, 31,..., A base 32, and a converging member 33, and the plurality of comb-like pieces 31 include the base 32 and the converging member 33. Assembled by.

  The plurality of comb-like pieces 31, 31,... Are formed of a plastic material, a metal material, a ceramic material, or a combination thereof, and the tip can be converged into a substantially hemispherical shape and gradually converged into a substantially conical shape toward the tip. Further, each comb-like piece 31 is formed in a substantially sword shape and curved in a cross-sectional arc shape in the width direction, and further, a hemispherical divided portion 310 having a predetermined size is formed at the tip portion thereof. In addition, it is preferable that the notch 311 extended in the base end part direction (along the axial direction of the nib 3) from the said front-end | tip part is provided in the front-end | tip part side of each comb-tooth shaped piece 31. FIG. The cut 311 may be one, or may be two or more (plural), and a predetermined length within the range (or outside the range) of the brush tip 34 linearly with the tip of each comb-like piece 31 as the cut start point. Formed. The base end portion of each comb-like piece 31 is a fixed portion that can be fixed to the base portion 32, and is provided with a widened portion that is wider than the flange portion and the distal end portion side. When the flange portion is inserted into the base portion 32, the front portion of the flange portion is used as a force point portion to be pushed by the pushing jig, and the flange portion serves to receive the pushing force while abutting with the jig. Plays the role of fixing at the position of the front end of the fixing portion. At this time, if the length from the rear side of the flange portion to the tip of the comb-like piece 31 is kept at a constant length with a high accuracy for each comb-like piece 31, the necessary number of comb-like pieces 31 can be formed into a circle. When inserted into the base 32 on the circumference, the tips of the comb-shaped pieces 31 can be formed in a conical pen tip shape. Despite the use of the comb-like pieces 31 that are separately separated in this way, the tip end of the brush tip 34 is aligned with the hemisphere as accurately as possible when assembled, and the entire tip side is gradually and as much as possible. A shape that converges into a conical shape can be obtained. In addition, it is preferable that the plurality of comb-like pieces 31, 31,.

  The base 32 is formed of a plastic material, a metal material, or a combination thereof separately from the plurality of comb-like pieces 31, and is formed into a cylindrical shape as a whole. A groove-shaped fixing portion is provided in which the fixed portion can be inserted in the axial direction (of the base portion 32). In this way, the plurality of comb-like pieces 31, 31,... Are configured to be arranged on the circumference (on one end face of the base portion 32) by inserting the base end portion into each fixing portion of the base portion 32.

  The converging member 33 is formed of a metal material, a resin material, or a combination thereof, and includes a substantially cylindrical converging portion 331 and a frustoconical narrowing portion 332. The converging part 331 is formed in a cylindrical shape so as to be fitted on the outer periphery of the plurality of comb-like pieces 31, 31,... Arranged on the circumference by the base part 32, and has an outer diameter substantially the same as the outer diameter of the base part 32. , And has an inner diameter that can be converged into a substantially cylindrical shape by pressing the intermediate part on the base end side of the plurality of comb-like pieces 31, 31,. The outer diameter and the inner diameter of the converging part 331 are gradually reduced in the narrowing part 332, and the comb-like pieces 31, 31,... The pieces 31, 31,... Have a substantially conical shape, and each hemispherical dividing section 310 has an inner diameter that can converge into a substantially hemispherical shape. The converging member 33 can also be formed integrally with a mouthpiece that attaches the pen tip 3 to the shaft cylinder 21 of the pen shaft 2.

  In this way, the plurality of comb-like pieces 31, 31,... Are inserted on the respective fixed portions of the base 32 and arranged on the circumference (on one end face of the base 32). Are converged into a conical shape by the converging member 33 and formed into a conical pen nib shape having a brush tip 34 at the tip and an ink lead-out path 35 between each comb-like piece 31. One or a plurality of cuts 311 extending in the proximal direction from the distal end portion are provided on the distal end side of the comb-like piece 31, and the distal end side of each comb-like piece 31 is further divided so that the distal end portion is By forming a hemispherical shape and gradually forming a conical shape as a whole toward the tip, even if the number of the plurality of comb-like pieces 31 is small, the tips of the plurality of comb-like pieces 31, 31,. The hemisphere is formed as much as possible, and the entire tip side is formed as conical as possible.

  Then, the ink relay core 4 is inserted into the hollow 30 of the nib 3, and the nib 3 is attached to the tip of the pen shaft 2. In this case, a core cover 5 is attached to the outer periphery of the ink relay core 4. The ink relay core 4 used here is a fiber core (fiber assembly) such as polyester, and has an appropriate length that can be arranged inside the pen tip 3 and the pen shaft 2, as shown in FIG. The tip is formed in a substantially conical shape so as to be fitted to the brush tip 34 of the nib 3 and the hollow tip 30 Т in the vicinity thereof, and the rear part is formed in a round bar shape. In addition, the rear part has a stepped round bar shape, and a front round bar shape part 41 continuous to the substantially conical shape part 40 at the tip and a rear round that expands the outer diameter and continues to this round bar shape part 41. And a bar-shaped portion 42. Further, the rear end portion of the rear portion is formed in a tapered shape that is gradually reduced in diameter toward the rear end surface. The core cover 5 is mounted on the outer periphery of the ink relay core 4 between the nib 3 and the ink relay core 4 and has an outer shape that is in close contact with the inner periphery of the nib 3 at least at the tip side of the nib 3. Yes. In this case, as shown in FIG. 4, the core cover 5 is made of a resin material having elasticity, and has a small diameter truncated cone that can hold the tip end side (particularly, the front round bar-shaped portion 41) of the ink relay core 4. A shape portion (or a cylindrical shape portion) 51 and a large-diameter columnar shape portion 52 capable of holding the middle of the ink relay core 4 (particularly the front portion side of the rear round bar shape portion 42). , 52 is provided with a step 53, and the outer peripheral edge 51E of the tip of the small-diameter frustum-shaped portion 51 and the front outer peripheral edge 52E of the large-diameter columnar portion 52 are compressed to the inner periphery of the pen tip 3. The contact portion 54 is pressed against the inner surface of the comb-like piece 31 and the bulge portion 55 is pushed out into a groove (ink lead-in path 35) between the comb-like pieces 31. In this way, the ink relay core 4 is inserted over the shaft core of the core cover 5, the conical tip of the ink relay core 4 is projected from the core cover 5, and the core is formed on the outer peripheral surface on the front end side of the ink relay core 4. A cover 5 is attached. The ink relay core 4 is inserted and arranged from the base side of the nib 3 into the hollow 30 to the tip thereof, and the tip of the ink relay core 4 is the tip of the hollow 30, that is, the brush end portion 34 and the hollow portion in the vicinity thereof. Fitted into the tip 30 Т, the frustoconical tip edge of the core cover 5 and the cylindrical front edge are in close contact with the inner circumference of the pen tip 3, and the pen tip 3 and the ink relay on the tip side of the pen tip 3 The space between the core 4 is filled and the outer periphery of the ink relay core 4 is surrounded by the core cover 5 between the nib 3 and the ink relay core 4. In this way, the base end side of the pen tip 3 is fixed to the tip of the pen shaft 2 via the mouthpiece 20, and the ink relay core 4 is connected to the ink tank inside the pen shaft 2 (shaft cylinder 21).

  In this way, the pen tip 3 is formed so that the tips of the plurality of comb-like pieces 31 are as hemispherical as possible and the tip side is entirely conical as much as possible, so that the tips are not misaligned. A hemispherical brush tip 34 is formed, and a constant ink outlet path 35 is formed between the comb-like pieces 31. Due to the structure of the nib 3, when the hemispherical brush tip 34 is pressed against the paper surface obliquely with respect to the axis, the hemispherical divisions 310 at the tips of the comb teeth 31 are displaced from each other and elastically deformed, You can write in any direction with respect to the paper surface because the tip part is restored to its original hemispherical shape by the elasticity when the outer diameter of the tip hemisphere part is expanded and the operation to press against the paper surface is removed. In addition to being able to write from any position and from any angle even if it rotates around the pen axis 2, the width of the line can be changed to be thicker or thinner by adjusting the writing pressure. It is possible to write various forms of characters with varying widths. At that time, the comb-like piece 31 bends and absorbs the writing pressure according to the strength of the writing pressure, and the cushioning property gives the writer's finger a soft touch and is said to be less tiring even if writing for a long time. There are advantages. This cushioning property can also reduce the deformation and wear of the pen tip when the writing pressure is high, and improve the durability of the writing portion. Even if the pen is left unattended for a long time, or the moisture evaporates from the surface of the pen tip and the ink dries and the tip slit of the pen tip 2 is blocked, if the writing operation is performed again, the writing tip 34 moves. Since the hemispherical shape is deformed to move the slits, the dried ink film or mass is broken and the ink can be easily derived. Further, since the notch 311 is provided on the tip side of each comb-like piece 31, the notch 311 also has an elastic deformation action on the brush tip 34, and the notch 311 has the same ink as the ink outlet path 35. There is a derivation action, and the above-mentioned writing performance can be enhanced as much as possible.

  In the writing instrument 1, in particular, the core cover 5 is mounted on the outer periphery of the ink relay core 4 between the pen tip 3 and the ink relay core 4, and at least the inner periphery of the pen tip 3 on the tip side of the pen tip 3. Since the space between the nib 3 and the ink relay core 4 is filled, the ink nib is filled with ink and the nib 3 is left in a downward state. By preventing ink from accumulating in the space between the nib 3 and the ink relay core 4, ink leakage can be reliably prevented. In addition, since the outer periphery of the ink relay core 4 is surrounded by the core cover 5 between the nib 3 and the ink relay core 4, the pen nib at the time of cap-off is provided even though the exposed part of the pen tip 3 is large. 3 (ink relay core 4) can be reliably prevented from drying up.

  In this embodiment, the nib 3 has the comb teeth 31 and the base 32 formed separately, and the comb teeth 31 are assembled to the base 32 and converged into a conical shape by the converging member 33. However, the pen tip 3 is provided with a base portion formed in a cylindrical shape and one end side of the base portion, and the tip end is substantially hemispherical and the whole is gradually converged into a substantially conical shape toward the tip end. A plurality of comb-like pieces, a brush tip at the tip, and a conical pen tip shape having an ink outlet path between the comb-like pieces, for example, each comb-like piece and the base May be formed integrally, or each comb-like piece may be processed into a converging state (conical shape), and the converging member may be omitted. With this type of nib, in the form in which the ink relay core is inserted into the hollow of the nib, the same effect can be obtained by similarly mounting the core cover on the ink relay core.

Partially abbreviated enlarged sectional view showing a main part of the writing instrument in one embodiment of the present invention An enlarged perspective view showing a nib employed in the writing instrument Partially omitted enlarged plan view showing the ink relay core employed in the writing instrument An enlarged plan view showing a core cover employed in the writing instrument

Explanation of symbols

1 Writing instrument 2 Pen axis 20 Mouthpiece ((circle) cylindrical mouth for fixing the pen tip)
DESCRIPTION OF SYMBOLS 21 Shaft cylinder 3 Pen tip 30 Hollow 30Т Hollow tip 31 Comb-shaped piece 310 Hemispherical part 311 Notch 32 Base 33 Convergence member 331 Convergence part 332 Constriction part 34 Pen tip part 35 Ink lead-out path 4 Ink relay core 40 Substantially conical part 41 Front round bar shaped part 42 Rear round bar shaped part 5 Core cover 51 Small diameter truncated cone shaped part (or cylindrical shaped part)
51E Tip outer peripheral edge 52 Large-diameter columnar part 52E Front outer peripheral edge 53 Step 54 Adhesion surface 55 Swelling part

Claims (3)

A pen shaft having an ink tank for storing ink; and a pen tip fixed to a tip of the pen shaft and connected to the ink tank via an ink relay core having a capillary force. A base formed in a shape, and a plurality of comb-like pieces provided on one end side of the base, the tip of which is substantially hemispherical and the whole is gradually converged into a substantially conical shape toward the tip. In a writing instrument of the type in which the tip of the brush tip is formed in a conical pen tip shape having an ink outlet path between each comb-like piece, and the ink relay core is inserted into the hollow of the pen tip,
The ink relay core is provided with a core cover,
The lead cover is mounted on the outer periphery of the ink relay core between the pen tip and the ink relay core, and has an outer shape that is in close contact with the inner periphery of the pen tip at least at the tip side of the pen tip; A writing instrument filled in a space between the nib and the ink relay core.   The writing instrument according to claim 1, wherein the nib is formed of a plastic material, a metal material, a ceramic material, or a combination thereof.   The core cover is formed of an elastic material, is compressed and deformed to the inner periphery of the pen tip, and is pushed between the comb-shaped pieces and the close contact portion pressed to the inner surface of each comb-shaped piece at least on the tip side. The writing instrument according to claim 1, further comprising a bulging portion.

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