JPH06127185A - Writing instrument - Google Patents

Abstract

PURPOSE:To eliminate movement of fingers for holding a writing instrument to a core side of a pen even if it is used by a person having a strong writing pressure by reducing a stage until ink is supplied to a pen lead, eliminating blocking of an opening of an ink leakage preventing air passage even if the instrument is held in any state. CONSTITUTION:A writing instrument 1 comprises an ink tank 2, a pen core 4 for discharging ink, a core holder 6 for holding the core 4 in the tank 2, and a connecting member 8 disposed in the tank 2 to supply the ink of the tank 2 to the core 2 in such a manner that the tank 2, the core 4 and the member 8 are disposed coaxially. The tank 2 is converged to an opposite side of the core, and substantially formed in a conical shape, and an opposite core side of the member 8 is brought into contact with an inner wall of the tank 2 at a vertex side or substantially brought into contact therewith.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument. Specifically, the present invention relates to a writing instrument mainly used for writing on a substantially vertical surface such as a whiteboard.

[0002]

2. Description of the Related Art A writing instrument a which has already been proposed for use in writing on a substantially vertical surface such as a whiteboard will be described with reference to FIG. The writing instrument a is, for example, as disclosed in Japanese Utility Model Publication No. 35-28716,
An ink tank b, a pen core d through which the ink c comes out, a pen core holder e for holding the pen core d in the ink tank b,
The ink tank b, the pen core d, and the relay member f for supplying the ink of the ink tank b to the pen core d are basically configured, and the ink tank b, the pen core d, and the relay member f are on the same axis. It is located in The ink tank b has a cone shape that tapers toward the pen core,
The non-pen core side end g of the relay member f comes into contact with the felt body i made of an absorptive material arranged on the inner wall h of the cone-shaped ink tank b on the side opposite to the apex. An opening k of an air passage j for preventing ink leakage from the pen core d due to the increase in pressure in the ink tank is formed near the end g of the relay member f on the side opposite to the pen core.

[0003]

However, in the conventional writing instrument a, it is necessary to supply the ink to the pen core d through the felt member i made of an absorbent substance in addition to the relay member f. It has been desired to reduce the number of parts required until the ink c is supplied to the pen core d. Further, when writing on a vertical surface such as a whiteboard, it is often the case that the writing tool a is held so that the side opposite to the pen core d faces obliquely downward for convenience of use. In this case, the ink c in the ink tank b inevitably flows toward the side opposite to the pen core d in the ink tank b, and the opening c near the end g of the relay member f opposite to the pen core side is closed by the ink c. It will come off. for that reason,
There has been a problem that the opening k does not function and the pressure in the ink tank b increases, causing ink leakage from the pen core d.

Further, since the pen core d side is tapered, the finger holding the writing instrument a may move to the pen core d side when used by a person having a strong writing pressure, which is difficult to use. To avoid this, apply the large diameter part of the writing instrument a on the side opposite to the pen core near the ball between the fingers of the palm, and wrap the rear part of the writing instrument with the entire palm, that is, hold it with a choke. It is conceivable to solve the above problems for the time being.

However, since such a way of holding is different from a way of holding an ordinary ballpoint pen or pencil, it may be inconvenient for a person who is not accustomed to holding the writing instrument by wrapping the back of the writing instrument with the entire palm. It was

The present invention has been made in view of the above-mentioned conventional problems, and the problems to be solved are as follows.
(1) Reducing the number of parts for supplying ink to the pen core, (2) No matter how the opening of the ink leakage prevention air passage holds the writing implement, and wherever the writing implement is placed, (3) A new writing instrument that prevents the opening from being blocked by ink, and (3) prevents the finger holding the writing instrument from moving to the pen core side even when used by a person with strong writing pressure. To provide.

[0007]

The writing instrument according to the present invention comprises:
The above problems are solved and are as follows. The writing instrument according to the present invention as set forth in claim 1 is an ink tank, a pen core from which ink is ejected, a pen core holder for holding the pen core in the ink tank, and the pen core arranged in the ink tank. In a writing instrument comprising an intermediary member for supplying ink of an ink tank and the ink tank, the pen core, and the intermediary member being in contact with each other, the ink tank is tapered toward the side opposite to the pen core, It has a substantially cone shape, and the end of the relay member on the side opposite to the pen core is in contact with or almost in contact with the apex side inner wall of the cone-shaped ink tank. In the writing instrument according to the present invention as defined in claim 2, an air passage is provided in the relay member for preventing ink leakage from the pen core due to an increase in pressure in the ink tank, and an opening of the air passage in the ink tank is provided. The ink is formed in a place where it does not get dipped in the ink even when the specified amount of ink is put in the ink tank.

[0008]

According to the writing instrument of the present invention as set forth in claim 1, the ink tank, the pen core and the relay member are arranged in contact with each other,
Since the ink tank has a substantially cone shape that is tapered toward the side opposite to the pen core, the distance between the relay member in the ink tank and the inner wall of the ink tank becomes narrower toward the side opposite to the pen core. The end of the relay member on the side opposite to the pen core is in contact with or almost in contact with the apex side inner wall of the cone-shaped ink tank. The closest. According to the writing instrument of the present invention as set forth in claim 2, the opening of the ink leakage prevention air passage provided in the relay member in the ink tank is not soaked in the ink even when a specified amount of ink is put in the ink tank. Since it is formed at the location, this opening is not blocked by the ink and always functions.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A writing instrument of the present invention will be described in detail below with reference to the accompanying drawings with reference to the drawings. 1 to 9
Shows a writing instrument according to an embodiment of the present invention. That is, FIG. 1 is a perspective view showing the overall structure of the writing instrument, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a side sectional view of the writing instrument with its axis parallel to the horizontal plane, and FIG. -A sectional view taken along line A,
FIG. 5 is a side sectional view of the writing instrument placed on a horizontal surface, FIG. 6 is a side sectional view of the writing instrument in a standing state with the cap facing up, and FIG. 7 is a side sectional view of the writing instrument in an inverted state with the cap facing down. 8 is a side cross-sectional view showing a state in which the cap is removed and the writing instrument is placed on a horizontal surface, and FIG. 9 is a view showing a modified example of the ink tank in the writing instrument of the embodiment of the present invention.

The writing instrument 1 is made of a synthetic resin, and has an ink tank 2, a pen core 4 placed at the tip of the ink tank 2 through which the ink 3 comes out, and a pen core holder for retaining the pen core 4 in the ink tank 2. 6 and a relay member 8 for supplying the ink 3 of the ink tank 2 to the pen core 4. Then, the writing instrument 1 is arranged in the order of the pen core 4-pen core holder 6-relay member 8 from the tip of the pen core 4 with the cap 5 removed, and the pen core 4, the pen core 4 and the pen except the tip portion 4a of the pen core 4. The lead holder 6 and the relay member 8 are used as the ink tank 2.
It is arranged so as to be in contact with each other on the same axis. An alternate long and short dash line indicated by reference numeral 7 indicates the axis of the writing instrument 1.

The ink tank 2 has a substantially barrel shape as a whole, is a so-called shaft of the writing instrument 1, that is, a portion for a handle for holding the writing instrument 1, and the ink 3 is contained therein. The ink tank 2 includes a rear shaft 12 and a front shaft 14.

The rear shaft 12 occupies most of the ink tank 2, and its outer shape is tapered toward the side opposite to the pen core 4. The rear shaft is made of a transparent material and has a substantially truncated cone shape. The rear shaft 12 is hollow, and the shape of the hollow portion is substantially frustoconical like the outer shape, and a prescribed amount of ink is stored in this hollow portion. The pen shaft 4 side of the rear shaft 12 is open, and the front shaft 14 is fixed to the opening 16 by an appropriate means such as adhesion.

The front shaft 14 covers the opening 16 of the rear shaft 12 and comprises a lid 18 and a tube body 20.
The tube body 20 also constitutes a relay member 8 described later.

The lid portion 18 is composed of a bowl-shaped holding portion 23 having a recess 22 for holding the pen core holder 6 by fitting, and a connecting portion 24 bonded to the opening 16 of the rear shaft 12.

The tube body 20 has a holding portion 23 of the lid portion 18.
Is extended from the center to the rear shaft 12 side, and connects the pen core 4 and a batting described later. Then, on the inner wall of the tube body 20, an air passage 21 having a L-shaped cross section which lies along the axial direction of the writing instrument 1 (hereinafter simply referred to as “axial direction”).
Are formed. The air passage 21 communicates with the inside and outside of the ink tank 2 together with another air passage 21A described later to prevent the pressure in the ink tank 2 from increasing. The air passage 21 has an opening 21a that communicates with the ink tank 2, and the opening 21a is formed at a position where the ink 3 does not submerge even when a specified amount of the ink 3 is put in the ink tank 2. In this example,
The ink tank has a volume of 22 cm ³ , and the ink 3 has a volume of 6
The length of cm ³ and the opening 21a from the tip of the tube body 20 is 10 cm.

The pen core 4 is made of a fibrous material, a felt material or a foamed resin, and is composed of a point portion 28 and a fitting portion 30 which are symmetrically formed with a constriction 26. The tip of the point portion 28 is located at the pen tip 29, and the fitting portion 30 fits into the tube 20. It also includes a fitting portion 30. Both the point portion 28 and the fitting portion 30 have a bullet shape with a sharp tip. Further, the pen core 4 is longer than the pen core holder 6, and when the pen core 4 is held by the pen core holder 6, the tip of the point part 28 and the tip of the fitting part 30 are pen-shaped. The size of the pen core 4 with respect to the pen core holder 6 is determined so as to project from the core holder 6.

The pen core holder 6 includes a holding portion 32 and a fitting portion 3.
4 is a hollow body in which the cross section of the writing instrument 1 in the axial direction is substantially T-shaped with its body lying down. Then, the pen core 4 is fitted and fixed in the hollow portion 35.

The holding portion 32 is a point portion 28 of the pen core 4.
A hollow cylindrical main part 36 for holding the latter half of the
An annular projection 38 is formed in the rear portion and annularly engages with the constriction 26 of the pen core 4. In addition, the inner surface 40 of the main portion 36
Another air passage 21A communicating with the air passage 21 of the tube body 20 via an ink storage sponge described later is formed therein. The air passage 21A may be provided in the point portion 28 of the pen core 4.

The fitting portion 34 comprises a step portion 33 extending radially from the rear end of the main portion 36, and a skirt 42 extending rearward from the tip end of the step portion 33 and fitted into the holding portion 23 of the lid portion 18. . A ring-shaped ink storage sponge 43 is put in the skirt 42.

The ink storage sponge 43 absorbs excess ink when the ink 3 is forcibly supplied from the opening 21a of the air passage 21 or an ink supply hole to be described later due to impact or rocking, and the writing instrument 1 This is for preventing the ink 3 from jetting from the ink tank, and is adapted to store the ink from the ink tank 2 by utilizing the absorbing power of the sponge.

The relay member 8 is formed by the tube body 20, a hollow holder 44 fitted on the rear end portion 20a of the tube body 20 and coaxial with the tube body 20, and the tube body 20 and the hollow holder 44. It is composed of a cylindrical batting 48 that is longer than the hollow holder 44 filled in the cavity 45.

The hollow holder 44 has the shape of a test tube, and a neck 46 having a large diameter is formed at the tip thereof.
The tube body 20 and the hollow holder 44 are integrated by fitting the rear end portion 20a of the tube body 20 into the neck 46. Further, the hemispherical bottom portion 50 of the hollow holder 44 is provided with one or a plurality of ink supply holes 52 located on the axial center. Ink tank 2 through the ink supply hole 52
Ink 3 infiltrates the batting 48. The ink supply hole 52 is not limited to the above position and may be near the apex of the hemispherical bottom 50. In short, the ink 3 in the ink tank 2 may be located at any position where it can be soaked in the batting 48 during writing.

The cap 5 includes a holding portion 32 and a point portion 2
8 is coated.

The writing instrument 1 described above is assembled in the following manner. The point part 28 of the pen core 4 is inserted into the holding part 32 of the pen core holding tool 6 through the ink storage sponge 43 put in the fitting part 34 of the pen core holding tool 6, and the point part 28 from the tip of the holding part 32. Stick out.
Then, the annular protrusion 38 of the holding portion 32 is engaged with the constriction 26 of the pen core 4, the pen core 4 is prevented from coming off from the pen core holder 6, and the latter half of the point portion 28 is a hollow cylindrical main portion 36. Held by

Next, batting 48 is put in the hollow holder 44. Since the batting 48 is longer than the hollow holder 44, the batting 48 projects from the neck 46 of the hollow holder 44.
(Note that the length of the batting 48 is, as described below, when the relay member 8 and the pen core holder 6 holding the pen core 4 are combined, the tip portion 30a of the fitting portion 30 of the pen core 4 is Is so long as to penetrate into the tip of the batting 48 and infiltrate the batting 48 so that the ink 3 permeates the pen core 4.)

In this state, the rear end portion 20 of the tube body 20
The batting 48 is pushed into the tube body 20 from a, and the rear end portion 20a and the neck 46 are joined by an adhesive or other joining means. As a result, the tube body 20 and the hollow holder 44 are integrated, and the relay member 8 having the batting 48 inside is formed. The tube body 20 and the hollow holder 44 may be integrated in advance.

Thereafter, the fitting portion 34 of the pen core holder 6 holding the pen core 4 is fitted into the recess 22 of the tip shaft 14 by press fitting or the like. As a result, the pen core 4, the pen core holder 6, the tube body 20 of the tip shaft 14, and the hollow holder 44 are arranged on the same axis. Finally, the connecting portion 24 of the front shaft 14 is fitted into the opening 16 of the rear shaft 12 in which a specified amount of ink 3 has been inserted by press fitting, or is contacted by ultrasonic welding or fitted with an adhesive. The writing instrument 1 is formed by an appropriate method such as burrs.

However, according to the present embodiment, the ink tank 2, the pen core 4, and the relay member 8 are arranged on the same axis, and the ink tank 2 is substantially cone-shaped and is tapered toward the side opposite to the pen core. Since it has a shape, the distance between the relay member 8 in the ink tank 2 and the inner wall of the ink tank 2 becomes narrower toward the pen core side. The end of the relay member 8 on the side opposite to the pen core is formed on the inner wall 2 of the cone-shaped ink tank 2 on the apex side.
Since it is arranged so as to be almost in contact with a, the relay member 8 is
It is closest to the ink tank 2 at its end opposite to the pen core. Therefore, when writing with the holding style such that the non-pen core side faces diagonally downward, the ink 3 in the ink tank 2
Flows toward the side opposite to the pen core, and in particular, the ink 3 directly infiltrates the end of the relay member 8 on the side opposite to the pen core.

Further, since the ink tank 2 is formed of a transparent member, the remaining amount of the ink 3 in the ink tank 2 can be known.

Further, the opening 2 in the ink tank 2 of the ink leakage prevention air passage 21 provided in the relay member 8.
Even if a specified amount of ink 3 is put in the ink tank 2, 1a is formed at a position where it is not always immersed in the ink 3 as shown in FIGS. 3 and 4 to 7.
1a is not blocked by the ink 3 and always functions.

Furthermore, since the rear end of the hollow holder 44 is the hemispherical bottom portion 50, the hemispherical shape allows ink to flow down naturally even when the bottom portion 50 has ink. Therefore, as shown in FIG. 7, even if the writing instrument 1 is inverted, the ink does not remain in the ink supply hole 52, so that the ink solidifies and blocks the ink supply hole 52 even when the writing tool 1 is not used for a long time. There is no.

Although the ink tank 2 is entirely made of a transparent member in this embodiment, a part of the ink tank 2 may be made transparent.

Further, the substantially pyramidal shape in the present invention is not limited to a mathematically defined cone or pyramid, and may be any one satisfying the following conditions. That is, a curved surface formed by a straight line that connects a closed curve on a plane, a polygonal line, or a line that is a combination of a curved line and a polygonal line, and a certain point outside the plane, one of several planes. A part or a part of a space surrounded by a surface that is a combination of a curved surface and a part of several flat surfaces. Specifically, by inserting a vertical groove 54 for preventing slip in the longitudinal direction of the ink tank 2, for example,
As shown in FIG. 9, the cross section perpendicular to the axial direction of the ink tank 2 may be a combination of straight lines and curved lines.

[0034]

The writing instrument of the present invention has the following advantages. (1) The ink tank, the pen core, and the relay member are arranged so as to be in contact with each other. Since the ink tank has a substantially cone shape that is tapered on the side opposite to the pen core, The distance between a certain relay member and the inner wall of the ink tank becomes narrower toward the pen core side. The end of the relay member on the side opposite to the pen core is in contact with or almost in contact with the apex-side inner wall of the cone-shaped ink tank. At the core end, it is closest to the ink tank. For this reason, when writing with the holding method with the non-pen core side facing diagonally downward, the ink in the ink tank flows to the non-pen core side, and the ink is directly applied to the non-pen core side end of the relay member. It will infiltrate. Therefore, since it is sufficient to supply the ink in the ink tank to the pen core only through the relay member, the number of parts can be reduced as compared with the prior art. (2) Since the opening in the ink tank of the air passage for preventing ink leakage provided in the relay member is formed in a portion that does not get dipped in the ink even when a specified amount of ink is put in the ink tank. The opening is not blocked by ink and always works. Therefore, no matter how the writing instrument is held, it is possible to very effectively prevent the ink leakage due to the increased pressure in the ink tank. (3) Since the diameter of the pen core side is large, the finger holding the writing instrument does not move to the pen core side even when used by a person with strong writing pressure.
It is easy to use.

[Brief description of drawings]

FIG. 1 is an overall perspective view illustrating a configuration of a writing instrument according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the writing instrument of FIG.

FIG. 3 is a side sectional view of the writing instrument of FIG.

FIG. 4 is a sectional view taken along line AA in FIG.

5 is a side sectional view of the writing instrument of FIG. 1 placed on a horizontal plane.

6 is a side sectional view showing a state in which the writing instrument of FIG. 1 is erected with the cap facing upward.

FIG. 7 is a side sectional view of the writing instrument of FIG. 1 in an inverted state with the cap down.

8 is a side sectional view showing a state in which the cap of the writing instrument of FIG. 1 is removed and the writing instrument is placed on a horizontal plane.

FIG. 9 is a cross-sectional view showing a modified example of the ink tank in the writing instrument of the embodiment of the present invention.

FIG. 10 is a diagram showing an example of a conventional writing instrument.

[Explanation of symbols]

 1 Writing Tool 2 Ink Tank 2a Top Inner Wall 3 Ink 4 Pen Core 6 Pen Core Holding Tool 8 Relay Member 21 Air Path 21a Opening 52 Ink Supply Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiomi Kase 1091 Tateishi, Fujioka, Gunma Mitsubishi Pencil Co., Ltd. Research and Development Center

Claims (2)

[Claims] 1. An ink tank, a pen core from which ink is ejected, a pen core holder for holding the pen core in the ink tank, and an ink in the ink tank which is arranged in the ink tank and is supplied to the pen core. In a writing instrument comprising a relay member for the ink tank, the pen core, and the relay member in contact with each other, the ink tank is tapered toward the side opposite to the pen core and has a substantially cone shape. The writing instrument, wherein the end of the relay member opposite to the pen core is in contact with or substantially in contact with the apex-side inner wall of the cone-shaped ink tank. 2. An air passage is provided in the relay member in order to prevent ink leakage from the pen core due to an increase in pressure in the ink tank, and an opening of the air passage in the ink tank allows a predetermined amount of ink to be discharged. The writing instrument according to claim 1, wherein the writing instrument is formed in a portion that is not soaked in ink even when placed in a tank.