JP2003182281A - Barrel for writing instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a barrel for a writing instrument in which a cost is reduced, a restriction in the degree of freedoms of designing is eliminated, an ink residue amount can be visually recognized and hand feeding of a grip member can be improved. <P>SOLUTION: The barrel for the writing instrument comprises the transparent barrel 1 made of a plastic, the black grip member 10 molded integrally with the barrel 1, and a transparent refill 20 to be inserted into the barrel 1. A reduced diameter mounting part 5 for the grip member 10 is formed to be recessed on the barrel 1. The member 10 is formed of a polymer such as a rubber or the like in a substantially cylindrical shape, provided in a thickness difference and formed partly with a thick part 11, and formed in a residual part with a light transmissive thin part 12. Thus, the residual mount of the black ink 21 in the refill 20 can be grasped from the thin part 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a barrel of a writing instrument having a grip member for preventing slippage.

[0002]

2. Description of the Related Art A conventional writing instrument has a long writing time.
There is a problem that the grip of the shaft cylinder (not shown) may slip or the fingers may hurt, so in order to eliminate this problem,
A cylindrical grip member made of a soft material such as rubber is fitted into the grip portion of the shaft cylinder. However, in the case where the grip member is simply fitted, when the writing instrument is a transparent pen ballpoint pen which is frequently used in office work, there arises a problem. That is, the transparent pen ballpoint pen has a great advantage that the remaining amount of ink can be easily visually grasped, but when the grip member is fitted, there arises a problem that the advantage is impaired.

[0003]

As a method of solving the above problem, there is a method of making the remaining amount of ink visible by making the grip member semitransparent or transparent. However, according to this method,
Since it is necessary to use a transparent material, the cost becomes high, and the degree of freedom in design is restricted as the transparency is secured. Further, when using a translucent material, the wall thickness must be reduced, which causes a problem that the grip feel of the grip member deteriorates.

As another method for solving the above-mentioned problems, as in Japanese Patent No. 2681750, a transparent shaft cylinder is provided with a protrusion and is exposed in a substantially floating island shape from a grip member, so that the inside of the ink storage pipe of the shaft cylinder is prevented. There is also a method of making it possible to visually check the remaining amount of ink in. However, according to this method, since a part of the shaft cylinder is exposed to the grip member in a substantially floating island shape, there is a problem that an unpleasant sensation occurs when the exposed portion hits the hand. Further, if the floating island is provided at a position where it does not touch the finger, it is actually difficult to grasp when the remaining amount of ink approaches the end.

The present invention has been made in view of the above, and it is an object of the present invention to provide a barrel of a writing instrument which can reduce the cost, eliminate the restriction of the degree of freedom in design, and improve the hand feeling of the grip member. Has an aim.

[0006]

In order to achieve the above object, the present invention provides a substantially transparent barrel made of plastic and a translucent or opaque grip member integrally molded with the barrel. And a refill for accommodating ink to be inserted into the shaft cylinder, wherein a reduced diameter mounting portion for a grip member is formed on the shaft cylinder, and the grip member is formed of a polymer into a substantially cylindrical shape. , Characterized in that the grip member is provided with a thickness difference so that a part thereof is a thick part and the remaining part is a light-transmissive thin part, and the presence or absence of refill ink can be visually confirmed from this thin part. There is.

The convex portion is projected from the peripheral surface of the reduced-diameter mounting portion of the shaft cylinder, and the thick portion of the grip member extends from the peripheral surface of the reduced-diameter mounting portion to the outer peripheral surface of the grip member. The thin portion of the grip member can be formed from the convex portion to the outer peripheral surface of the grip member. In addition, a recess is formed on the peripheral surface of the reduced-diameter mounting portion of the shaft cylinder, and the thin portion of the grip member extends from the peripheral surface of the reduced-diameter mounting portion to the outer peripheral surface of the grip member. It is also possible to use the thick portion of the grip member up to the outer peripheral surface. Furthermore, it is preferable to form the thin portion of the grip member within a range of 0.2 to 0.8 mm.

Here, it is preferable that the shaft cylinder and the grip member in the claims are molded by a two-color molding method. The substantially transparent barrel includes transparent and translucent.
Further, the grip member is made of a polymer, specifically, various elastomers, rubbers, or the like, and may be colored or not. The refill ink may be black, white,
It may be red or blue. Further, the concave portion and the convex portion may be singular or plural. Furthermore, the thin portion may be a simple hole or may be formed of various characters, patterns, figures, and the like.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 5, a barrel of a writing instrument according to the present embodiment has a predetermined plastic (for example, A transparent barrel 1 made of ABS resin, acrylic resin, etc., an opaque black grip member 10 molded on the barrel 1, and a transparent refill 20 removably inserted into the barrel 1. I have it.

As shown in FIG. 1 and FIG. 2, the shaft cylinder 1 includes a cap 2 having a substantially hollow truncated cone shape, and a hollow main body shaft 3 which is detachably screwed into the open end of the cap 2. Equipped with. As shown in FIG. 2, the cap 2 is fitted with a coiled spring 4 for returning the refill 20 at a sharpened tip. Further, the main body shaft 3 is formed such that a reduced-diameter mounting portion 5 for the grip member 10 is recessed and formed inward in the outer peripheral wall on the side of the opening front end, and a plurality of convex portions 6 are axially formed from the reduced-diameter mounting portion 5. It projects side by side (see FIGS. 2 and 3). As shown in FIG. 1, a pocket clip 7 is fitted to the opening end portion side of the main body shaft 3, and a push button 8 for pressing the refill 20 is fitted so as to be movable back and forth.

As shown in FIGS. 1 and 2, the grip member 10 is formed into a substantially cylindrical shape by using a thermoplastic elastomer or the like which is excellent in non-adhesiveness, aging resistance and elastic recovery, and the shrinkage of the barrel 1 is performed. The diameter mounting portion 5 is integrally coated with the two-color molding method.
The grip member 10 is provided with a thickness difference so that a part of the grip member 10 is a thick part 11 and the remaining part is a light-transmitting thin part 12. From the thin part 12, the ink 21 in the refill 20 is filled. You can check the remaining amount.

Specifically, as shown in FIGS. 2 and 3, the grip member 10 has a thick portion 11 extending from the peripheral surface to the outer peripheral surface of the reduced-diameter mounting portion 5, and each of the reduced-diameter mounting portion 5 is formed. From the convex portion 6 to the outer peripheral surface is a thin portion 12 that transmits a certain amount of light rays. The thick portion 11 of the grip member 10 is 1 mm or more,
The thin portion 12 is 0.2 to 0.8 mm, preferably 0.5 m
It is good to set it to m or more. 0.2 to 0.8 mm for thin part 12
When the thickness is less than 0.2 mm, the finger is hurt or the strength is lowered, and when it exceeds 0.8 mm, the light transmittance is deteriorated. Thin part 1
2 may be an elliptical hole shown in FIG. 1 or may be a plurality of characters shown in FIG.

As shown in FIG. 1, the refill 20 is filled with black ink 21, the pen tip of the tip portion protruding from the cap 2 is fitted into the spring 4 of the barrel 1, and the sealed end. The portion faces the push button 8 of the barrel 1.

In the above structure, when writing with a writing instrument for a long time, since the cylindrical grip member 10 made of a soft material is integrally formed on the grip of the shaft cylinder 1, the grip of the shaft cylinder 1 is No slipping or finger pain. Further, when the ink 21 remains, the grip member 10
The whole looks black (see Fig. 4), but consumes ink 21
When the boundary line of the ink 21 passes through the thin-walled portion 12 of the grip member 10, the thin-walled portion 12 transmits light to some extent, so that the portion floats and is visually recognized (see FIG. 5).

According to the above construction, since it is not always necessary to use a transparent material, the cost is high, and the degree of freedom in design (shape / color) is restricted due to the securing of transparency. Can be resolved very effectively. Moreover, since the thickness of the grip member 10 is only partially reduced, the hand feeling of the grip member 10 does not deteriorate during writing. Further, since it is not necessary to expose a part of the shaft cylinder 1 to the grip member 10 in a substantially floating island shape, there is no discomfort during writing, and it is easy to grasp even when the remaining amount of the ink 21 approaches the end. be able to. Furthermore, by forming the thin portion 12 into a plurality of characters, symbols, etc., it is possible to greatly improve the display property.

Next, FIG. 6 shows a second embodiment of the present invention. In this case, a plurality of recesses 9 are arranged in the axial direction on the peripheral surface of the reduced diameter mounting portion 5 of the barrel 1. The recess is formed, and the thin portion 12 of the grip member 10 extends from the peripheral surface of the reduced-diameter mounting portion 5 to the outer peripheral surface of the grip member 10. The grip member extends from each recess 9 of the reduced-diameter mounting portion 5 to the outer peripheral surface of the grip member 10. 1
The thick portion 11 of 0 is used. The other parts are the same as those in the above-described embodiment, and thus the description thereof is omitted. In this embodiment, the same effect as the above embodiment can be expected, and moreover, when it is not possible to form a plurality of convex portions 6 in the axial direction on the peripheral surface of the reduced diameter mounting portion 5 of the shaft cylinder 1, It is clear that it makes sense.

In the above embodiment, the grip member 10 is used.
The ink and the ink 21 are black, respectively, but the invention is not limited to this. For example, if the thickness of the grip member 10 is adjusted to black and the thickness of the ink 21 is adjusted to white, the thin-walled portion 12 floats up when the ink 21 remains and becomes invisible when the ink 21 is consumed.

[0018]

As described above, according to the present invention, there is an effect that the cost can be reduced, the restriction on the degree of freedom in design can be effectively eliminated, and the hand feeling of the grip member can be improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional explanatory view showing an embodiment of a barrel of a writing instrument according to the present invention.

FIG. 2 is a cross-sectional explanatory view of a main part showing an embodiment of a barrel of a writing instrument according to the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an explanatory diagram showing a state when ink remains in the embodiment of the barrel of the writing instrument according to the present invention.

FIG. 5 is an explanatory diagram showing a state at the time of ink consumption in the embodiment of the barrel of the writing instrument according to the present invention.

FIG. 6 is a view, corresponding to FIG. 3, showing a second embodiment of the barrel of the writing instrument according to the present invention.

[Explanation of symbols]

1-axis cylinder 2 cap 3 body axis 5 Reduced diameter mounting part 6 convex 9 recess 10 Grip member 11 Thick part 12 Thin part 20 refills 21 ink

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C350 GA03 KF01 NA15 NA21 NC05                       NC20                 2C353 HA09 HC04 HJ03

Claims (4)

[Claims] 1. A substantially transparent barrel made of plastic,
A shaft cylinder of a writing instrument, comprising a translucent or opaque grip member integrally molded with the shaft cylinder, and a refill for accommodating ink to be inserted into the shaft cylinder, wherein the shaft cylinder has a reduced diameter for the grip member. The mounting portion is formed, the grip member is formed of a polymer in a substantially cylindrical shape, and a thickness difference is provided to this grip member to make a part thereof a thick part, and the remaining part is a light-transmissive thin part, A barrel for a writing instrument, wherein the presence or absence of refill ink can be visually confirmed from the thin portion. 2. A projecting portion is projected from a peripheral surface of a reduced diameter mounting portion of a shaft cylinder, and a thick portion of the grip member is formed from a peripheral surface of the reduced diameter mounting portion to an outer peripheral surface of the grip member. The barrel of the writing instrument according to claim 1, wherein a thin portion of the grip member extends from the convex portion to the outer peripheral surface of the grip member. 3. A recessed portion is formed on a peripheral surface of a reduced diameter mounting portion of a shaft cylinder, and a thin portion of the grip member is formed from a peripheral surface of the reduced diameter mounting portion to an outer peripheral surface of the grip member. The barrel of the writing instrument according to claim 1, wherein the grip member has an outer peripheral surface up to the thick portion of the grip member. 4. The thin portion of the grip member has a thickness of 0.2 to 0.8.
The barrel of the writing instrument according to claim 1, 2 or 3, which is formed in a range of mm.