JP2001270281A - Writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce fatigue associated with long time writing. SOLUTION: A delivery pencil 10 is constituted by including a main body tube 11 consisting of a front region 16 positioning on a penpoint part 12 side, a rear region 17 positioning on a push button part 14 side and an intermediate region 18 positioning between the front region 16 and the rear region 17. The intermediate region 18 is made to be constricted or to be diametrically made smaller than the outer diameters of the front region and of the rear region 17. Concretely, the intermediate region 18 has an outer diameter, which curvedly reduces so as to be connected respectively from the front end side of the intermediate region 18 connecting with the boundary position B1 on the front region 16 side and from the rear end side of the intermediate region 18 connecting with the boundary position B2 on the rear region 17 side to the middle of the intermediate region 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing implement, and more particularly, to a writing implement which is less liable to fatigue even when writing for a long time.

[0002]

2. Description of the Related Art A writing instrument such as a draw-out pencil or a ball-point pen having a main body cylinder having a pen tip portion provided on a front end side has been conventionally known. Generally, most of these writing instruments are those whose main body cylinders are provided in a relatively simple cylindrical shape having a substantially constant outer diameter, or those whose front end side has a relatively large diameter. Also, the weight structure is such that the center of gravity is arranged on the front end side to improve the feel when first held.

[0003]

However, such a writing instrument has a disadvantage that the feeling of fatigue when writing for a long time increases due to the following factors. That is, while writing, the front end side of the main body tube is pinched with the thumb, the index finger and the middle finger, and a small reciprocating rotation around the intermediate region between the front region and the rear region of the main body tube by light snap of the wrist. This is performed by giving a movement, that is, a pivot operation to the writing implement. At this time, an intermediate region located between the front region and the rear region of the main body cylinder comes into contact with the edge region of the hand connecting the bases of the thumb and the index finger, whereby the writing implement is slightly inclined. In this state, it is supported at two places, the pinched portion on the front end side and the edge region of the hand. Here, while the edge region of the hand has a complicated surface shape, the body tube has a simple cylindrical shape, so that the edge region of the hand and the body tube hardly come into contact with each other. Therefore, at the time of writing, the intermediate region is difficult to adhere to the edge region of the hand, and the writing implement cannot be firmly supported there. The cylinder is liable to shake in directions other than the proper direction, and stable pivoting operation cannot be obtained,
These factors lead to an increase in fatigue when writing for a long time. Also, especially in the case of a double chuck type writing instrument, since the weight of the internal mechanism itself on the front side necessarily acts, the close contact of the intermediate area with the edge area of the hand described above. The degree is further reduced, and the above inconveniences become more apparent.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such inconvenience, and an object of the present invention is to provide a writing instrument which can reduce fatigue caused by long-time writing.

[0005]

To achieve the above object, the present invention relates to a writing instrument having a main body cylinder having a pen tip portion provided on a front end side, wherein the main body cylinder has a front region, a rear region, , An intermediate area between each of these areas,
The intermediate region is provided in a constricted shape having a diameter smaller than the outer diameter at the boundary position with the front region, and has a weight structure in which the center of gravity is located in the intermediate region. According to such a configuration, at the time of writing, the intermediate region is easily adapted to the edge region of the hand connecting the bases of the thumb and the index finger, and the thumb and the index finger that pinch the edge region of the hand and the main body tube The writing implement is securely supported at two places, that is, the middle finger and the middle finger, so that the load concentration on the fingertip can be suppressed, and a stable pivoting operation can be performed, thereby reducing fatigue associated with long-time writing. be able to. In addition, since the middle area has the center of gravity, the writing area acts so that the middle area naturally rides on the edge area of the hand during writing, and the writing implement is more reliably provided at two places, the edge area of the hand and the fingertip. I can support it. In addition, since the center of gravity is located in the intermediate area serving as the rotation center during writing, a stable pivoting operation with less blurring of the writing implement during writing can be obtained.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a configuration may be adopted in which the intermediate region is provided with an outer diameter that decreases in a curved manner from the front end and the rear end of the intermediate region toward the center of the intermediate region. preferable. With this configuration, the intermediate region can be more easily adapted to the edge region of the hand, and fatigue caused by long-time writing can be further reduced.

In the present specification, the term “before”, which is a term indicating a position or a direction, unless otherwise specified.
It is used on the pen tip side of the writing implement, and "rear" is used on the opposite side in the axial direction.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic front view of an embodiment in which the present invention is applied to a draw-out pencil, and FIG. 2 is a schematic perspective view showing a use state of the draw-out pencil of FIG. . In these figures, a dispensing pencil 10 as a writing instrument includes a main body tube 11 made of resin, a pen point portion 12 connected to a front end of the main body tube 11, and a clip portion 13 arranged at a rear end portion of the main body tube 11. , Knock part 1 connected to the rear end of main body cylinder 11
The core material C is fed out from the front end side of the pen tip portion 12 by a feeding mechanism (not shown) provided inside the main body tube 11. Although the detailed structure of this feeding mechanism is omitted here,
In the present embodiment, a so-called double chuck type structure is adopted, and each time the knock portion 14 is pressed, the back chuck and the front chuck advance in synchronization with each other, so that the core material C can be fed out by a predetermined length. Have been.

The main body cylinder 11 is located at a front region 16 located at the pen tip portion 12 side, a rear region 17 located at the knock portion 14 side, and is located between the front region 16 and the rear region 17. An intermediate area 18 is provided. Here, as shown in FIG. 2, the intermediate region 18
This is a region including a portion that contacts the edge region A of the hand located between the bases of the thumb F1 and the index finger F2.

The front region 16 and the rear region 17 are not particularly limited, but are each provided in a substantially cylindrical shape. In particular, the front region 16 is configured to include a non-slip member (not shown) made of rubber or the like.
6 are prevented from slipping, such as the thumb F1 and the index finger F2.

The intermediate region 18 is provided in a constricted shape having a diameter smaller than the outer diameter of the front region 16 and the rear region 17. Specifically, the intermediate region 18 is set to have a smaller diameter than the outer diameter of each of the boundary positions B1 and B2 with the front region 16 and the rear region 17, and the intermediate region 1 connected to the boundary position B1.
8, the outer diameter decreases in a curved manner from the rear end side of the intermediate region 18 continuing to the boundary position B2 toward the center of the intermediate region 18. For this reason, the main body cylinder 11
Has a shape that narrows while drawing a gentle parabola from the front region 16 and the rear region 17 toward the center of the intermediate region 18.

The pen tip portion 12 includes a tapered portion 21 connected to the main body cylinder 11, and a chuck portion 22 protruding from the tip side of the tapered portion 21 and movably disposed in the front-rear direction, that is, in the axial direction. A known structure is employed. More specifically, the chuck portion 22 allows the core material C to move forward and backward when the knock portion 14 is pressed, in conjunction with the above-described unillustrated feeding mechanism (not shown).
When the key is not pressed, the core C is tightened to restrict advance / retreat.

The clip portion 13 is not particularly limited in the present invention, and is made of resin or the like.
1 or may be formed of metal or the like that is separate from the main body cylinder 11. In short, various modifications are possible as long as the shape and structure can be hooked on a hooking object such as a pocket of clothes. Note that reference numeral 2
4 and 25 are provided in the main body tube 11 and the clip portion 13,
It is a projection for preventing the clip portion 13 from falling off from the hooking target. Further, even in the knock portion 14, the shape, material, and the like are not particularly limited,
Various structures can be adopted, such as providing an eraser or the like in part.

By the way, the drawing-out pencil 10 has a weight structure such that the center of gravity of the whole is located in the intermediate region 18 by properly setting the dimensions, weight, installation position and the like of each of the members described above. Therefore, various changes are possible within this range. For example, when a body having a shape and a weight distribution in which the center of gravity is located at the center of the intermediate region 18 is used as the main body cylinder 11, the other members are located between the center of gravity of each member and the center of the intermediate region 18. The material, the installation position, the weight, and the like are set so that the value obtained by multiplying the distance by the weight of the corresponding member becomes equal before and after the center of the intermediate region 18 as a boundary.

Next, another embodiment of the present invention will be described with reference to FIG. In the following description, the same reference numerals are used for the same or equivalent components as those of the above-described embodiment, and the description is omitted or simplified.

In this embodiment, the present invention is applied to a ballpoint pen, and the external shape of the ballpoint pen 30 is substantially the same except that the pen tip portion 12 and the knock portion 14 are slightly different. I have. Here, on the front end side of the pen point portion 12, a pointed head 32 having a rotating ball (not shown) at the front end is provided so as to be able to advance and retreat. The pointed head 32 is connected to an ink storage pipe (not shown) that is stored in the main body cylinder 11, and each time the knock part 14 is pressed, the tip part 32 repeatedly moves forward and backward from the front end of the tapered part 21 (illustrated in the drawing). (Omitted).

In this embodiment, a weight structure is adopted in which the center of gravity of the ball-point pen 30 is located in the intermediate area 18 as in the above-described embodiment. For this reason, it is preferable that the position of the center of gravity of the ballpoint pen 30 be slightly forward of the extended pencil 10.

Therefore, according to each of the above embodiments, since the middle region 18 is formed in a constricted shape and the center of gravity of the writing instrument is located in the middle region 18, the edge of the hand having a complicated curved surface shape is formed. It is easy to adjust to the area A, and the writing implement can be reliably supported even in the intermediate area 18 during writing, and the effect of reducing the load on the fingertip holding the writing implement can be obtained. Also,
Since it becomes easy to fit into the edge area A of the hand, the main body cylinder 11
Wasteful operation can be suppressed, and a stable pivot operation can be performed during writing.

In each of the above embodiments, the front region 16 and the rear region 17 have a substantially cylindrical shape. However, the present invention is not limited to this. Taper type gradually decreasing or increasing toward 18;
Alternatively, various shapes such as a barrel shape in which the shaft diameter partially increases can be adopted.

Further, the shape of the intermediate region 18 is not limited to the shape in each embodiment.
Various changes are possible as long as they are provided in a constricted shape having a diameter smaller than the outer diameter of each of the boundary positions B1 and B2.

Further, in each of the above-described embodiments, an example in which the present invention is applied to a dispensing pencil and a ball-point pen is illustrated and described. However, the present invention can be applied to other writing instruments such as a fountain pen and a marking pen.

[0023]

As described above, according to the present invention, a narrowed intermediate region having a diameter smaller than the outer shape of the boundary position between the front region and the intermediate region, and the center of gravity is located in the intermediate region. With such a configuration, during writing, the middle region is easily adapted to the edge region of the hand connecting between the bases of the thumb and forefinger, while reducing the load on the thumb, forefinger, and middle finger that pinches the main body tube. In addition, a stable pivot operation can be performed, and fatigue associated with long-time writing can be reduced. In addition, the middle region naturally rides on the edge region of the hand during writing, so that the load on the thumb and forefinger can be further reduced, and a stable pivot operation with less blur can be performed during writing.

Further, since the intermediate region is provided with an outer diameter that decreases in a curved manner from the front end and the rear end of the intermediate region toward the center of the intermediate region, the intermediate region is further provided on the edge region of the hand. It can be easily understood.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a dispensing pencil according to one embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a use state of the extended pencil of FIG.

FIG. 3 is a schematic front view of a ballpoint pen according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Pencil (writing implement) 11 Main body cylinder 12 Pen tip 16 Front area 17 Rear area 18 Intermediate area 30 Ballpoint pen (writing implement) B1 Boundary position B2 Boundary position

Claims (2)

[Claims] 1. A writing instrument having a main body cylinder having a pen tip provided on a front end side, wherein the main body cylinder includes a front region, a rear region, and an intermediate region between these regions. A writing instrument, wherein the intermediate region is provided in a constricted shape having a diameter smaller than an outer diameter at a boundary position with the front region, and has a weight structure in which a center of gravity is located in the intermediate region. 2. The writing instrument according to claim 1, wherein the intermediate region is provided with an outer diameter that decreases in a curved manner from the front end and the rear end of the intermediate region toward the center of the intermediate region. .