JP6735883B2 - Writing instrument - Google Patents

Description

The present invention relates to a writing instrument.

Conventionally, in this type of writing instrument, for example, in Patent Document 1, a mounting body formed of rubber, synthetic resin, or the like is fitted in an opening of a shaft cylinder, and rubber is provided near a writing section of an internal mechanism such as a cartridge type ballpoint pen. There is disclosed a structure in which a fitting body made of synthetic resin or the like is attached, and an inclined surface of the fitting body is tightly fitted in an opening of the attachment body.

JP-A-61-112700

The writing instrument of Patent Document 1 has a structure in which a fitting body as a separate component is fitted and inserted in the vicinity of a writing portion of an internal mechanism (corresponding to the cartridge of the present application) such as a ballpoint pen. Therefore, the writing pressure at the time of writing disengages the fitting body from the internal mechanism such as a ballpoint pen, which may cause the pen tip to sink into the barrel. In addition, the writing instrument of Patent Document 1 has an increased manufacturing cost as the number of parts of the internal mechanism such as the ballpoint pen increases due to the fitting body.

Furthermore, in the writing instrument of Patent Document 1, the inclined surface of the fitting body may bite into the opening of the attachment body of the barrel due to the writing pressure during writing, and it may be difficult to remove the internal mechanism such as the ballpoint pen. Further, since the writing instrument of Patent Document 1 has a structure in which the cap fits into the fitting body, the fitting body may further bite into the mounting body due to a strong pushing operation of the cap when the cap is attached, and When removing the cap, you may accidentally pull out the internal mechanism such as the ballpoint pen.

The present invention solves the above-mentioned conventional problems, and there is no risk of the pen tip immersing in the barrel during writing, and the fitting state between the barrel and the cartridge does not change when writing or removing the cap. Therefore, it is an object of the present invention to provide a writing instrument in which the cartridge can be easily removed at all times, and there is no risk of accidentally pulling out the cartridge when removing the cap, and an increase in the number of parts of the cartridge can be suppressed.

In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite cartridge side.

A first invention of the present application comprises a barrel 2, a pen tip 4 at a front end thereof, a cartridge 3 which is detachably attached to a front end opening portion of the barrel 2, and a cap 7 attached to the pen tip side. It is a writing instrument provided, wherein the cartridge 3 includes a pen tip 4, a pen tip holder 5 to which the pen tip 4 is fixed, and an ink containing cylinder 6 in which the rear portion of the pen tip holder 5 is press-fitted and fixed. The nib holder 5 is formed with a tapered front portion 51 to which the nib 4 is fixed, and an insertion portion formed rearward of the tapered front portion 51 and having an outer diameter smaller than a rear end of the tapered front portion 51. 52, a press-fitting portion 53 formed rearward of the insertion portion 52, having an outer diameter smaller than that of the insertion portion 52, and press-fitted and fixed to the front end opening of the ink containing cylinder 6, and the tapered front portion. 51 and a step portion 54 formed between the insertion portion 52, and in a state in which the cartridge 3 is inserted and attached to the front end opening portion of the barrel 2, the tapered front portion 51 is the 2, the step portion 54 is in contact with the front end of the barrel 2, and the outer surface of the insertion portion 52 is detachably fitted to the inner surface of the front end opening of the barrel 2, A grip portion 51a for attaching and detaching the cartridge is formed on the outer surface of the front portion 51, and the cap 7 is fitted to the outer surface of the front end portion of the barrel 2 in a state where the cap 7 is attached to the pen tip side. The cap 7 is not in contact with the tapered front portion 51.

Since the writing instrument 1 of the first invention adopts the above-described configuration, the step portion 54 of the pen tip holder 5 is brought into contact with the front end of the barrel 2, so that the pen tip 4 is placed inside the barrel 2 during writing. It is possible to avoid immersing, and since the cap 7 is not in contact with the tapered front portion 51, the fitting state of the shaft cylinder 2 and the cartridge 3 does not change when the cap is attached and detached, and the cartridge 3 can always be easily removed. In addition, there is no risk of accidentally pulling out the cartridge 3 when the cap 7 is removed, and moreover, an increase in the number of parts of the cartridge 3 is suppressed and a simple structure is obtained.

A second invention of the present application is the writing instrument 1 of the first invention, characterized in that an anti-slip portion is formed in the grip portion 51a.

In the writing instrument 1 according to the second aspect of the present invention, since the grip portion 51a is formed with the non-slip portion, the cartridge 3 can be easily attached and detached, and the writing instrument can be easily grasped. Specific examples of the non-slip portion include an uneven portion formed on the surface of the grip portion 51a, or an outer cover made of an elastic material. Examples of the uneven portion include a plurality of annular convex portions or concave portions, a mesh-shaped convex portion or concave portions, a plurality of dot-shaped convex portions or concave portions, and the like.

There is no risk that the pen tip will sink into the barrel when writing, and the fitting state between the barrel and the cartridge does not change when writing or removing the cap, making it easy to always remove the cartridge. At times, there is no risk of accidentally pulling out the cartridge, and moreover, an increase in the number of parts of the cartridge can be suppressed.

It is a longitudinal section of an embodiment of the invention. It is a principal part expanded longitudinal cross-sectional view of FIG. It is a front view which shows the cartridge of FIG. It is an enlarged front view which shows the pen point holder of FIG.

An embodiment of a writing instrument of the present invention will be described with reference to the drawings. (See FIGS. 1 to 4)

A writing instrument 1 according to the present embodiment includes a barrel 2, a pen tip 4 at a front end thereof, a cartridge 3 that is detachable from a front end opening of the barrel 2, and a cap 7 attached to the pen tip side. Equipped with.

-Shaft cylinder The shaft cylinder 2 is a cylindrical body made of synthetic resin or metal with both ends open.

Inner Fitting Part An inner fitting part 21 is formed on the inner surface of the front end opening of the barrel 2. The inner fitting portion 21 has an annular smooth surface. The outer fitting portion 52a of the small diameter portion of the pen tip holder 5 is detachably fitted to the inner fitting portion 21. The inner fitting portion 21 may be an inward protrusion (for example, an annular protrusion, a plurality of dot-shaped protrusions distributed in a circumferential shape, etc.) in addition to the annular smooth surface.

Cap Fitting Part On the outer surface of the front end of the barrel 2, a cap fitting part 22 is formed, on which the inner surface of the cap 7 can be attached and detached. The cap fitting portion 22 is formed by an outward protrusion. The outward protrusions are, for example, annular protrusions or a plurality of dot-shaped protrusions distributed in a circumferential shape. The cap fitting portion 22 may be configured by an annular smooth surface in addition to the outward protrusion.

Friction Member A friction member 8 made of a low-wear elastic material (for example, silicone resin, SBS resin, SEBS resin, etc.) is press-fitted and fixed to the rear end opening of the shaft tube 2. The friction member 8 thermally discolors the handwriting of the thermochromic ink by frictional heat generated by rubbing the handwriting.

Cartridge The cartridge 3 includes a nib 4, a nib holder 5 to which the nib 4 is fixed at a front portion, and an ink containing cylinder 6 to which a rear portion of the nib holder 5 is fixed at a front end.

-Pen tip The pen tip 4 employs a ball-point pen tip having a front end rotatably holding a ball.
The ball-point pen tip contains an elastic body that biases the ball forward and brings the ball into close contact with the inner surface of the front edge portion. By bringing the ball into close contact with the inner surface of the front edge portion, ink leakage and air inclusion from the pen tip 4 when not writing can be prevented. The pen tip 4 may be a marking pen body made of a fiber processed body or a porous body other than the ballpoint pen tip.

-Pen tip holder The pen tip holder 5 is made of a synthetic resin cylindrical body whose both ends are open. The pen tip 4 is fixed to the front end opening of the pen tip holder 5. The rear end portion of the pen tip holder 5 is press-fitted and fixed to the front end opening portion of the ink containing cylinder 6.

The outer surface of the nib holder 5 has a tapered front portion 51 at the front end, and an insertion portion 52 formed behind the tapered front portion 51 and having an outer diameter smaller than the outer diameter of the rear end of the tapered front portion 51. Between the press-fitting portion 53 formed behind the insertion portion 52 and having an outer diameter smaller than the outer diameter of the rear end of the insertion portion 52, and the tapered front portion 51 and the insertion portion 52. It is provided with a first step portion 54 formed and a second step portion 55 formed between the insertion portion 52 and the press-fitting portion 53.

1
In a state where the outer surface (outer fitting portion 52a) of the insertion portion 52 is fitted to the inner surface of the front end opening portion (inner fitting portion 21) of the barrel 2, the tapered front portion 51 is located closer than the front end of the barrel 2. It is located in the front. A grip portion 51a is formed on the outer surface of the tapered front portion 51 when the cartridge is attached or detached (when the cartridge is replaced). The outer diameter of the rear end portion of the tapered front portion 51 is set to be substantially the same as the outer diameter of the front end of the barrel 2. As a result, at the time of writing, the region of the outer surface of the front end portion of the barrel 2 behind the outer surface of the large diameter portion can be gripped. A front end portion of the tapered front portion 51 is formed in a tapered shape.

On the surface of the grip portion 51a, a non-slip portion including an uneven portion (an uneven portion formed by a plurality of annular protrusions and a plurality of annular grooves) is formed. As a result, stable gripping can be performed when the cartridge is attached and detached and when writing.

Further, the outer diameter of the rear end of the tapered front portion 51 is set to be smaller than the inner diameter of the opening of the cap 7 of the barrel 2. Thereby, the non-contact state between the inner surface of the cap 7 and the pen tip holder 5 is maintained.

An outer fitting portion 52a is detachably fitted to the inner fitting portion 21 on the inner surface of the front end opening of the barrel 2 on the outer surface of the insertion portion 52. The outer fitting portion 52a is formed by an annular outward protrusion. The outer fitting portion 52a is fitted to the inner fitting portion 21 (annular smooth surface) on the inner surface of the front end opening of the barrel 2. In a state where the outer fitting portion 52a is fitted to the inner fitting portion 21 on the inner surface of the front end opening of the barrel 2, the first step portion 54 and the front end of the barrel 2 are brought into contact with each other in the front-rear direction, The backward movement of the tip holder 5 is restricted. Incidentally, the outer fitting portion 52a may be an annular smooth surface other than this.

The outer surface of the press-fitting portion 53 is formed by an annular smooth surface. The outer surface of the press-fitting portion 53 is press-fitted and fixed to the inner surface of the front end opening of the ink containing cylinder 6. In a state where the outer surface of the press-fitting portion 53 is press-fitted and fixed to the inner surface of the front end opening portion of the ink containing cylinder 6, the second step portion 55 and the front end of the ink containing cylinder 6 are brought into contact with each other in the front-rear direction.

-Ink storage cylinder The ink storage cylinder 6 is a cylindrical body with both ends opened, and is obtained by extrusion molding of synthetic resin. The outer diameter of the ink containing cylinder 6 is set smaller than the outer diameter of the outer fitting portion 52a of the insertion portion 52. As a result, the ink containing cylinder 6 can be smoothly inserted into the front end opening of the shaft cylinder 2. Inside the ink container 6, an ink (water-based or oil-based ink) and a follower (for example, a high-viscosity fluid) that is filled in at the rear end of the ink and moves forward as the ink is consumed are housed. In the present embodiment, preferably, the ink is a water-based thermochromic ink. The thermochromic ink is preferably a reversible thermochromic ink that discolors or decolors when heated. A tail plug may be fixed to the rear end of the ink containing cylinder 6.

-Cap The cap 7 is formed by a bottomed cylindrical body having one end opened and the other end closed, and is obtained by a synthetic resin molded body. On the inner surface of the opening of the cap 7, a fitted portion 71 that can be fitted into the cap fitting portion 22 of the barrel 2 is formed. The fitted portion 71 is formed by an inward protrusion. The inward protrusions (for example, annular protrusions, a plurality of dot-shaped protrusions distributed in a circumferential shape, and the like) ride over and are locked by the cap fitting portion 22 (outward protrusions). The fitted portion 71 may be an annular smooth surface in addition to the inward projection.

Air passage A first air groove 56 is formed in the first step portion 54 in the radial direction, and a second air groove 56 is formed on the outer surface of the insertion portion 52 in the front-rear direction communicating with the first air groove 56. An air groove 57 is formed, and an air circulation gap 9 communicating with the second air groove 57 is formed between the outer surface of the ink containing cylinder 6 and the inner surface of the shaft cylinder 2. With the cap 7 removed from the pen tip side and the cartridge 3 inserted into the barrel 2, the ink is accommodated by the first air groove 56, the second air groove 57, and the air circulation gap 9. Air can flow between the rear end opening of the cylinder 6 and the outside air.

-Cartridge Removal With the cartridge 3 inserted in the barrel 2, the cap 7 is removed from the pen tip side, the outer face of the barrel 2 is held by one hand, and the grip portion 51a of the pen tip holder 5 is held by the other hand. The cartridge 3 can be removed from the barrel 2 by grasping and pulling.

When the cartridge insertion cartridge 3 is removed from the barrel 2, the grip portion 51a of the pen tip holder 5 is grasped by hand and inserted from the rear end of the ink containing barrel 6 into the front end opening of the barrel 2, The first step portion 54 of the tip holder 5 is brought into contact with the front end of the barrel 2, and the insertion portion 52 of the pen tip holder 5 is inserted into the inner surface of the front end opening of the barrel 2. As a result, the cartridge 3 is inserted into the barrel 2.

In the writing instrument 1 of the present embodiment, since the first step portion 54 of the pen tip holder 5 is brought into contact with the front end of the barrel 2, it is possible to prevent the pen tip 4 from sinking into the barrel 2 during writing. .. Further, since the cap 7 is not in contact with the tapered front portion 51, the fitting state between the barrel 2 and the cartridge 3 does not change when the cap is attached and detached, and the cartridge 3 is always easily removed, and There is no risk of accidentally pulling out the cartridge 3 when removing 7. Moreover, an increase in the number of parts of the cartridge 3 can be suppressed, and the cartridge 3 can be obtained with a simple structure.

In the writing instrument 1 of the present embodiment, the grip portion 51a is formed with the non-slip portion, so that the cartridge 3 can be easily attached and detached, and the writing instrument can be easily grasped.

1 Writing Tool 2 Shaft Cylinder 21 Inner Fitting Part 22 Cap Fitting Part 3 Cartridge 4 Nib 5 Nib Holder 51 Tapered Front 51a Gripping Part 52 Inserting Part 52a Outer Fitting Part 53 Press-fitting Part 54 First Step 55 2nd step part 56 1st air groove 57 2nd air groove 6 Ink storage cylinder 7 Cap 71 Fitting part 8 Friction member 9 Air circulation gap

Claims (3)

A writing instrument comprising a barrel, a pen tip at a front end, and a removable cartridge at a front end opening of the barrel,
The cartridge includes a pen tip, a pen tip holder to which the pen tip is fixed, and an ink storage tube in which a rear portion of the pen tip holder is press-fitted and fixed and which stores thermochromic ink therein .
The pen tip holder has a tapered front portion to which the pen tip is fixed, an insertion portion formed rearward of the tapered front portion and having an outer diameter smaller than a rear end of the tapered front portion, and the insertion portion. Is formed between the tapered front portion and the insertion portion, which is formed rearward, has an outer diameter smaller than that of the insertion portion, and is press-fitted and fixed to the front end opening of the ink containing cylinder. And a first step portion,
In a state where the cartridge is inserted into the front end opening of the barrel, the tapered front portion is located in front of the front end of the barrel, and the first step portion is in contact with the front end of the barrel. The outer surface of the insertion portion is detachably fitted to the inner surface of the front end opening portion of the shaft cylinder, and the grip portion for attaching and detaching the cartridge is formed on the outer surface of the tapered front portion.
A friction member made of a low-wear elastic material that thermally changes the handwriting of the thermochromic ink by frictional heat generated by rubbing the handwriting of the thermochromic ink is press-fitted and fixed to the rear end opening of the barrel. Writing instrument characterized by. The writing instrument according to claim 1, wherein an anti-slip portion is formed on the grip portion. The nib holder includes a second step portion formed between the insertion portion and the press-fitting portion,
The writing instrument according to claim 1, wherein the second step portion has a chamfered portion between the second step portion and the insertion portion.

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