JP3348180B2 - Grasping structure of writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip member in which a recess is formed in the front part of a barrel, a gripping member made of a material softer than the material of the barrel is attached to the recess, and the gripping member is attached to the tip of the barrel. The present invention relates to a gripping member structure of a writing instrument fixed by the above.

[0002]

2. Description of the Related Art As an example of a writing implement having a gripping member made of a material softer than the material of the barrel, the one shown in FIG. 7 is known.

[0003] Specifically, in the front part of the barrel 101,
A concave portion 102 is formed, and a holding member 103 such as a rubber member is attached to the concave portion 102 in a state of being in close contact therewith. It is mounted in a press fit rather than in close contact. A male screw 104 is formed at the tip of the shaft cylinder 101 (recess 102).
4, a tip member 105 is screwed. Tip member 1
05 is formed in a conical shape, and the outer diameter of the rear end portion 105a is formed to be substantially the same as the outer diameter of the gripping member 103. That is, the gripping member 103 is
Concave portion 1 formed in rear end portion 105a and shaft cylinder 101
02 and the rear end portion 102a of the shaft cylinder 1
01 does not move back and forth.

[0004]

However, in the above-described mounting structure of the grip portion, although it is securely mounted, since each dimension is set in a press-fit state, it is very difficult to assemble. In some cases, a special jig was required to reduce the frictional resistance between the gripping portion and the shaft cylinder (for example, see Japanese Utility Model Application Publication No.
87489). Therefore, it has been considered that the inner diameter of the gripping member is formed large in advance, which is inserted into the shaft cylinder, then contracted by heat treatment, and the gripping member is securely attached to the shaft cylinder (for example, Japanese Utility Model Application Laid-Open No. 61-128084).
However, the gripping member also becomes expensive, and the number of heating steps increases, resulting in an increase in the price of the product.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a concave portion formed in a front portion of a barrel, and a holding member made of a material softer than the material of the barrel in the concave portion. In the gripping member structure of a writing instrument in which the gripping member is fixed by a tip member attached to the distal end of the barrel, the concave portion is formed so as to gradually increase in diameter from the front end of the barrel toward the rear. At the same time, the inner diameter of the gripping member is
The concave portion is formed so that the diameter gradually increases from
The gist is that it is brought into close contact with.

[0006]

1 and 2 show a first example. Shar
An example in which the present invention is applied to a pencil is shown, but a ball pen may be used. In the drawings, the upper part is referred to as the rear, and the lower part is referred to as the front. The barrel main body 1 includes a front shaft 2, a front member 3 screwed forward of the front shaft 2, and a rear shaft 4 press-fitted behind the front shaft. A lead mechanism 5 for feeding a pencil lead or the like is disposed inside the barrel body 1. The lead mechanism 5 includes a lead tank 6, a chuck body 7 fixed in front of the lead tank 6, and the like. And a center detent member 8 disposed in front of the chuck body 7. Reference numeral 9 denotes a clip fixed to the rear shaft 4, and reference numeral 10 denotes a knock cap detachably attached to the lead tank 6 for operating the lead feeding mechanism 5. is there.

A recess 11 is formed in the front part of the front shaft 2. The recess 11 has the same diameter as or slightly smaller than the outer diameter of the recess 11 and is softer than the material of the front shaft 2. A gripping member 1 made of a material generally called a rubber member, such as a plastic elastomer, NBR, or silicone rubber.
2 are attached in close contact with each other. The recess 11
Are formed to have a large diameter sequentially from the front end of the front shaft 2 toward the rear. That is, it is formed in a conical shape. on the other hand,
The inner diameter of the gripping member 12 is also gradually increased from the front to the rear, so that the gripping member 12 comes into close contact with the conical recess 11.

The front end of the grip portion 12 is in contact with a locking portion 3a formed at an intermediate portion of the tip member 3. By this abutting action, the movement of the gripping member 12 is regulated forward,
The rearward movement of the gripping member 12 is restricted by the rear end 11 a of the recess 11. A male screw portion 13 is formed behind the tip member 3 from the locking portion 3a, and is screwed to a female screw portion formed on the inner surface in front of the front shaft 2. Fixing means such as fitting or simple press fitting may be used.

Next, the operation will be described. Gripping member 12
Is attached to the recess 11 of the front shaft 2, the inner surface of the gripping member 12 and the outer surface of the recess 11 come into contact with each other at or near the final insertion position. Therefore, in the attaching process, there is no frictional resistance between the inner surface of the holding member 12 and the outer surface of the concave portion 11. In other words, the rear end of the gripper 12 is
Immediately before or at the time of contact with the rear end portion 11 a of the first holding member 1, the entire inner surface of the grip portion 12 comes into close contact with the surface of the concave portion 11. Here, when the tip member 3 is screwed, the grip member 12
Is regulated. Immediately before the rear end of the grip portion 12 contacts the rear end portion 11a of the concave portion 11, the entire inner surface of the grip portion 12 is brought into close contact with the surface of the concave portion 11 to be in a press-fit state, so that the concave portion 11 (shaft) of the grip portion 12 is formed. Rotation with respect to the cylinder main body 1) can be prevented as much as possible.

FIGS. 3 and 4 show modified examples of the shape of the recess 11. FIG. 3 shows a concave portion having a curved conical shape, and FIG. 4 shows that there is some frictional resistance during assembly.
It is formed stepwise (stepwise). in this way,
The shape of the concave portion and the shape of the gripping member according to the shape of the concave portion are not limited to those in the previous example, but may be any suitable one. Further, in the previous example, the description has been made in consideration of the shaft cylinder and the grip portion having a circular cross section, but may be a square, a hexagon, or an ellipse. At least a concave portion having a larger diameter in order from the front end of the front shaft toward the rear is sufficient. As shown in FIG. 5, a groove 11 b is formed in the longitudinal direction of the recess 11, and a projection 12 a engaging with the groove 11 is formed inside the gripping member 12, so that the shaft cylinder of the gripping part 12 is formed. Rotation with respect to the main body 1 can be prevented.

FIG . 6 shows an example in which an immersion groove 11c is formed in the rear end 11a of the recess 11, and the rear end of the gripping member 12 is sunk into the immersion groove 11c. Thus, the gripper 12
By making the rear end of the grip portion 12 dive into the immersion groove 11c, it is possible to prevent the grip portion 12 from being turned up or swollen due to deterioration or the like.

[0012]

According to the present invention, a concave portion is formed in the front portion of the barrel, a holding member made of a material softer than the material of the barrel is attached to the recess, and the holding member is fixed by a tip member attached to the tip of the barrel. In the gripping member structure of the writing instrument, the concave portion is formed so as to gradually increase in diameter from the front end of the barrel toward the rear, and the inner diameter of the gripping member is adjusted to the front end.
The concave portion is formed so that the diameter gradually increases from
The gripping member can be easily and securely attached to the shaft cylinder.

[Brief description of the drawings]

FIG. 1 is a longitudinal half sectional view showing a first example of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a longitudinal half sectional view of a main part showing a modification of the gripping member.

FIG. 4 is a longitudinal half sectional view of a main part showing a modification of the gripping member.

FIG. 5 is a cross-sectional view showing a modification of the gripping member.

FIG. 6 is a vertical half sectional view of a main part showing a third example of the present invention.

FIG. 7 is a longitudinal half sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder main body 2 Front shaft 3 Front member 4 Rear shaft 3a Locking part 5 Core feeding mechanism 6 Core tank 7 Chuck 8 Core detent member 9 Clip 10 Knock cap 11 Depression 11a Rear end 11b Groove 11c Submerged groove 12 Gripping member 12a Projection 13 Male screw 13a Guide tube

Claims (2)

(57) [Claims] 1. A concave portion is formed in a front portion of a barrel, and a holding member made of a material softer than the material of the barrel is attached to the concave portion.
There the gripping member to the gripping member structure in writing instrument fixed by the preceding member attached to Jikuto tip, the recess from the front end of the barrel so as to form so as to be sequentially larger diameter toward the rear, the gripping member Inside diameter from front end to back
The gripping member structure of a writing instrument, wherein the gripping member is formed so as to have a large diameter sequentially and is closely attached to the concave portion . 2. A concave portion is formed at a front portion of the barrel, and a holding member made of a material softer than the material of the barrel is attached to the concave portion.
In a gripping member structure of a writing instrument in which the gripping member is fixed by a tip member attached to the tip of a barrel, a groove is formed in a longitudinal direction of the concave portion, and a protrusion engaging with the groove is provided inside the gripping member. The gripping member structure of the writing instrument according to claim 1, wherein the gripping member is formed.