JP2003103990A - Cap and cap for mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a hazard that when a cap is inadvertently swallowed, a through hole for air circulation which is formed on the peripheral part of a bottom formed at the rear end part of a cap, might be covered because the through hole is entrapped into the inner wall face of throat and consequently, securing sufficient air circulation is difficult. SOLUTION: This cap is fitted into the barrel in a freely attachable/ detachable manner and has a bottom which is provided at the forward end part of a cylindrical part formed from the rear end to the forward part of a cap body. In addition, the through hole is formed at the bottom in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap of a writing instrument such as a ballpoint pen or a mechanical pencil, which is detachably attached to a barrel, and a cap of cosmetics, liquid containers, and medicinal containers, not limited to the writing instrument.

[0002]

2. Description of the Related Art As an example, Japanese Patent Laid-Open No. 10-166785.
The publication will be described. The cap described in that publication has a bottom, and a plurality of through holes are formed near the periphery of the bottom. When an infant or the like accidentally swallows the cap, the through hole ensures air circulation, thereby avoiding a risk such as suffocation as much as possible.

[0003]

By the way, in the above-mentioned prior art, the through hole for air circulation is formed in the peripheral portion of the bottom portion formed in the rear end portion of the cap. Therefore, if it is accidentally swallowed, the through hole formed in the peripheral portion will sneak into the inner wall surface of the throat, and as a result, the through hole will be covered (see FIG. 10) to ensure sufficient air circulation. There was a risk that it would be difficult to do.

[0004]

SUMMARY OF THE INVENTION The present invention is a cap removably attached to a barrel, the cap having a bottom, the bottom being formed from the rear end of the cap body toward the front. The gist of the present invention is that it is provided at the front end of the cylindrical portion and that a through hole is formed in the bottom thereof in the axial direction.

[0005]

Function: Air is circulated near the radial center of the cap. In the unlikely event that the cap is in the lateral direction, air is circulated through the gap between the clip and the cap.

[0006]

EXAMPLE One example will be described with reference to FIGS. 1 to 3 and 5 to 8. This is an example of applying the present invention to a side knock type mechanical pencil. The rear part of the barrel 1 is a core tank part 2 having a hexagonal cross section capable of accommodating a plurality of cores. An eraser 3 is removably press-fitted to the rear end of the barrel 1, and a cap 4 is detachably fitted so as to cover the eraser 3. The clip 4 is integrally formed on the cap 4 with the through hole 5c formed in the base portion, but it may be formed by separate members and fixed to each other by means such as press fitting. The cap 4 will be described in detail later. On the other hand, a core insertion hole 6 having a smaller diameter than the core tank portion 2 but capable of accommodating a plurality of cores is formed inside the front side of the barrel 1, and a collar portion 7 that slides with the core tank 2. The slide member 8 having is arranged so as to be movable back and forth,
A chuck body 9 that holds and releases the core is fixed to the front end of the slide member 8. A chuck ring 10 for opening and closing the chuck body is surrounded by the outer periphery of the front side of the chuck body 9. Reference numeral 11 denotes a tip member that is detachably fixed to the front end of the barrel 1 by means such as screwing. The tip member 11 holds the lead lightly and prevents the lead from retreating during lead-out operation. A slider 14 in which a core detent member 12 made of a rubber-like elastic body for blocking and a guide member 13 for guiding the core is arranged is arranged so as to be retractable. Reference numeral 15 is an O-ring made of a rubber-like elastic body arranged in a gap between the slider 14 and the tip member 11,
The slider 14 cannot move with an external force of about its own weight.

A recess 1a is formed in a part of the shaft cylinder 1 slightly in front of the center. The recess 1
A window hole 15 is formed in a, and a knock piece 16 for moving the slide member 8 forward is arranged in the window hole 15. One side surface of the knock piece 16 is exposed by the recess 1a, and the other side surface is in contact with the thick portion 1b of the barrel 1. Further, the top portion 17 of the knock piece 16 is located at a position slightly higher than the locus of the circumscribed circle of the barrel 1 (specifically, about 0.5 mm to 1.5 mm).
mm) (see FIG. 3), but may be formed to have almost the same height. In this way, even if the height of the knock piece 16 protruding from the shaft cylinder 1 is substantially equal to the outer diameter of the shaft cylinder 1, since the concave portion 1a is formed, a sufficient pressing stroke is required in the lead-out operation. Can be secured. Reference numeral 18 is a locking claw that prevents the knock piece 16 from falling off the window hole 15. In addition, as shown in FIG.
The a may be formed on both sides or around the knock piece 16. Operability in the lead-out operation is improved.

The knock piece 16 has a U-shaped cross section, and inclined surfaces 19 are formed in front and back on both side surfaces thereof. The inclined surface 19 is in contact with the inclined surface 20 formed in the intermediate portion of the slide member 8 (see FIG. 5). That is, when the knock piece 16 is pressed in the direction perpendicular to the longitudinal direction of the barrel 1, the inclined surface 19 of the knock piece 16 is pressed.
Presses the inclined surface 20 of the slide member 8, whereby the slide member 8 advances and the lead is paid out.
Reference numeral 21 is a grip member 21 made of a rubber-like elastic body attached to the front portion of the recess 1a. The grip member 21 has spiral grooves 22 formed at large intervals. It is also possible to improve the anti-slip property when gripped by directly knurling the barrel 1 without using. Further, reference numeral 23 is a chuck spring composed of an elastic member such as a coil spring for urging the slide member 8 and the chuck body 9 backward.

Next, the cap 4 will be described in detail.
A tubular portion 24 is formed inside the cap 4, and the tubular portion 24 is integrally formed from the rear end of the cap 4 toward the front. A bottom portion 25 is formed integrally with the front end portion of the tubular portion 24.
Four through holes 26 are formed radially and axially in the peripheral portion of the. Although the through hole 26 is large in order to increase the flow rate of air, it may be smaller than the diameter of the core used to prevent the core from falling out of the core tank portion 2. . Also, the cap 4
The front end face of is inclined and cut out (inclined portion 27), and a step portion 28 formed by a large diameter portion is formed on the inner surface of the inclined portion 27. On the other hand, a step portion 29 formed by a small diameter portion is also formed on the rear portion of the shaft cylinder 1. Then, the stepped portion 28 of the cap 4 is brought into contact with the stepped portion 29 of the shaft cylinder 1, so that the immersion distance of the cap 4 with respect to the shaft cylinder 1 is restricted. Further, a plurality of fitting protrusions 30 are radially formed in the inner middle portion of the cap 4, and the annular recess 31 formed in the shaft cylinder 1 is formed.
Can be engaged and fitted with. That is, the engagement of the fitting projection 30 with the annular recess 31 and the steps 28, 29
The cap 4 is fitted into the shaft cylinder 1 by being abutted against. A step portion 32 formed by a small diameter portion is formed above the fitting protrusion 30. When the cap 4 is depressed beyond the stepped portion 28, the stepped portion 32 abuts on the rear end of the barrel 1 to prevent the cap 4 from further retracting into the barrel 1. Has become. Also, the clip 5 of the cap 4
On the inner wall surface on the side, a flat portion 4a is formed in the longitudinal direction, and a flat portion that matches the flat portion 4a is also formed on the rear portion of the barrel 1 (see FIG. 8). That is, by aligning the flat portion 4a of the cap 4 with the flat portion 1c of the barrel 1, the cap 4 is positioned with respect to the barrel 1, and rotation during use is prevented.

The cap 4 in this example is formed of a resin molded product, and a gate position into which resin flows during molding is provided in a recess 5b formed in a connecting portion between the cap 4 and the clip 5. However, it may be provided on the upper surface of the bottom portion 25. Since the protrusion by the gate exists inside the recess 5b and the tubular portion 24, the appearance of the product can be improved. Further, since the through hole 26 is formed in the axial direction, the core pin located at the front can be inserted into the core pin at the rear (core pin portion for forming the through hole) at the time of molding, so that there is no eccentricity. An accurate molded product (cap) can be obtained. Also, in this example,
A gap 4 a is provided between the tubular portion 24 and the inner wall surface of the cap 4. This prevents dents on the outer surface (dents due to heat shrinkage; generally called "sinks") that occur during molding.

A second example will be described with reference to FIG. The tubular part 24 of the cap 4 is provided with a decoration tool 33 such as a character doll.
It is an example in which is attached. In this example, the hand or head of the doll is the protrusion 34, and the gap formed between them is the air flow passage. Of course, if the doll 33 and the through hole 26 are communicated with each other, air will flow through the protrusion and the through hole.

[0012]

The present invention is a cap detachably attached to a shaft cylinder. The cap has a bottom part, and the bottom part is formed from the rear end of the cap body toward the front. Since the through hole is formed in the front end portion in the axial direction in the bottom portion thereof, even if the cap is swallowed, it is possible to ensure the air circulation until the treatment is performed.

[Brief description of drawings]

FIG. 1 is an external view showing an example of the present invention.

FIG. 2 is a vertical cross-sectional view of FIG.

FIG. 3 is a cross-sectional view of FIG. 1 (knock piece portion).

FIG. 4 is a cross-sectional view showing a modified example corresponding to FIG.

FIG. 5 is an enlarged view of a main part of FIG.

FIG. 6 is a vertical cross-sectional view showing a cap.

FIG. 7 is a top view of the cap.

8 is a cross-sectional view of FIG. 1 (cap portion).

FIG. 9 is a sectional view showing a second example of the cap.

FIG. 10 is a vertical cross-sectional view showing a conventional example.

[Explanation of symbols]

1-axis cylinder 1a recess 2-core tank 3 eraser 4 cap 5 clips 6 core insertion hole 7 Core receiving part 8 Slide member 9 Chuck body 10 chuck ring 11 Tip member 12 core detent member 13 Guide member 14 Slider 15 windows 16 knock pieces 17 top 18 Locking claw 19 slope 20 slope 21 Grip member 22 Groove 23 Chuck spring 24 tubular part 25 bottom 26 through holes 27 slope 28 steps 29 steps 30 Mating protrusion 31 annular recess 32 steps 33 ornaments 34 Protrusion

Claims (4)

[Claims] 1. A cap removably attached to a shaft cylinder, the cap having a bottom portion, the bottom portion being at a front end portion of a tubular portion formed from the rear end of the cap body toward the front. A cap characterized by being provided with a through hole formed in the bottom thereof in the axial direction. 2. The cap according to claim 1, wherein an accessory having a projection partly formed is attached to the cylindrical part. 3. The cap according to claim 1, wherein a clip is provided on a side surface of the cap. 4. The mechanical pencil cap according to claim 1, wherein the inner diameter of the through hole formed in the bottom portion is smaller than the diameter of the core to be used.