JPH11129684A - Cap for writing instrument or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap for a writing instrument or the like for smoothly feeding the air by suppressing a damage to a nib without generating a hermetical seal fault with a simple mold structure. SOLUTION: The cap 1 comprises an outer cylinder opened at both ends, an inner cylinder 3 having an annular sealing portion 31 to be sealingly engaged with a writing instrument body on an inner periphery and formed of a cylinder with a bottom, and a plurality of longitudinal ribs 4 extended axially on the inner periphery of the cylinder 2 and integrally. The inner periphery of the cylinder 2 is integrally coupled to the outer periphery of the cylinder 3 above the portion 31, and air passages 6 are provided between the ribs 4. An annular gap 5 is provided between an outer periphery of the portion 31 and the inner periphery of the cylinder 2. Lower ends of the ribs 4 are extended downward from an opening end of the cylinder 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cap for a writing instrument or the like. More specifically, the present invention relates to a cap such as a writing instrument that allows air to flow even if an infant or the like accidentally swallows it and avoids suffocation.

[0002]

2. Description of the Related Art Conventionally, in a ventilation cap in which an inner cylinder and an outer cylinder are integrally connected by a rib, for example, a flat-opened flat pipe is disclosed.
Japanese Patent No. 100895 discloses an outer cap (corresponding to an outer cylinder of the present application) for the purpose of allowing air flow when a cap is swallowed and preventing the pen tip from being damaged by inserting the pen tip into an air passage. An inner cap (corresponding to the inner cylinder of the present application) having a sealed portion inside the rib (corresponding to the vertical rib of the present application)
And an air passage is formed between the ribs, a flange is provided continuously below the opening end of the inner cylinder, and the flange is divided by a slit provided on the axis of the rib. Is disclosed.

However, the conventional cap has a structure of a rib for connecting the outer cap and the inner cap so that air can flow therethrough, and a structure of providing a flange for guiding the pen tip inward. In addition to complicating the mold structure, the ribs cause sink marks (i.e., molding failure due to uneven wall thickness) in the seal fitting portion of the inner cap inner surface with the writing instrument body, and the sealing of the pen tip of the writing instrument body is impaired. There is a possibility of complete (that is, poor airtightness). In addition, when the pen tip is inserted into the cap, the air flow resistance increases due to the presence of the flange for guiding the pen tip inward, which may hinder smooth air flow.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and has a simple mold structure.
Does not cause poor airtightness, suppresses damage to the pen tip, and
An object of the present invention is to provide a cap such as a writing instrument that allows smooth air distribution. In the present invention, “upper” indicates the cap closing side, and “lower” indicates the cap opening side.

[0005]

[Means for Solving the Problems]

(Outline) The cap 1 of the writing instrument of the present invention includes an outer cylinder having an inner cylinder 3 having a bottomed cylindrical body having an inner peripheral surface provided with an annular seal portion 31 for sealingly fitting with the writing instrument body, and an outer cylinder having both ends opened. 2
And a cap 1 such as a writing implement made of a synthetic resin molded body integrally connected to the inner peripheral surface of the outer cylinder 2 by a longitudinal rib 4 extending in the axial direction so that air can flow therethrough. A plurality of vertical ribs 4 are provided integrally, and the inner peripheral surface of the outer cylinder 2 and the outer peripheral surface of the inner cylinder 3 above the annular seal portion 31 are integrally connected by the vertical ribs 4. An air passage 6 is formed therebetween, and an annular gap 5 is provided between the outer peripheral surface of the annular seal portion 31 of the inner cylinder 3 and the inner peripheral surface of the outer cylinder 2,
It is required that the lower end of the vertical rib 4 extends below the opening end of the inner cylinder 3 (claim 1).

The inner peripheral surface of the outer cylinder 2 and the outer peripheral surface of the inner cylinder 3 above the annular seal portion 31 are integrally connected by a vertical rib 4, and the outer peripheral surface of the annular seal portion 31 of the inner cylinder 3 is connected to the outer peripheral surface. By providing the annular gap 5 between the inner cylinder 3 and the inner peripheral surface of the outer cylinder 2, the thickness of the annular seal portion 31 in the radial direction is made uniform, the occurrence of sink in the annular seal portion 31 is suppressed, and The sealing performance with the writing implement body is satisfied, and the pen tip can be reliably sealed by the inner cylinder 3.

Further, the lower end of the vertical rib 4 extends below the opening end of the inner cylinder 3, so that the outer peripheral surface near the opening end of the inner cylinder 3 and the inner peripheral surface of the outer cylinder 2 are located between the outer peripheral surface. The annular gap 5 can be reduced. Thereby, when the pen point is inserted into the cap 1, the pen point contacts the lower end of the vertical rib 4 and is guided inward, so that the pen point is inserted into the annular gap 5 and is damaged. Can be avoided. That is, a guide portion 41 for guiding the pen tip inward is provided at the lower end of the vertical rib 4.
Can be configured.

Further, the vertical ribs 4 form an axial ventilation passage 6 between the vertical ribs 4 between the outer peripheral surface of the inner cylinder 3 and the inner peripheral surface of the outer cylinder 2 and simultaneously move the pen tip inward. Since the guide portion 41 for guiding the pen tip is formed, not only the breakage of the pen tip is suppressed, but also the mold structure is simplified, and at the same time, the smooth flow of air passing through the inside of the cap 1 in the axial direction becomes possible.

In the cap 1 for a writing instrument or the like according to the first aspect, the lower end of the vertical rib 4 has a tapered shape that inclines inward as it goes upward, and the pen tip is guided inward at the lower end of the vertical rib 4. It is preferable that the guide portion 41 is formed (claim 2).

Thus, when the pen tip is inserted into the cap 1, even if the pen tip is brought into contact with the lower end of the vertical rib 4, the pen tip is moved along the tapered lower end (that is, the guide portion 41). Can be smoothly inserted into the inner cylinder 3, and damage to the pen tip can be further avoided.

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a line BB of FIG. 4 is a plan view of FIG. 1 and FIG. 5 is a bottom view of FIG.

The cap 1 is made of an injection molded body of a synthetic resin (for example, polypropylene). The inner peripheral surface of the outer cylinder 2 having both open ends and the outer peripheral surface of the inner cylinder 3 having a bottomed cylindrical body are formed by a plurality of vertical members. The ribs 4 are integrally connected. The vertical rib 4
An axial ventilation passage 6 is formed between them.

The outer cylinder 2 is a cylindrical body whose both ends are opened in the axial direction, and a plurality of (specifically, 16) longitudinal ribs 4 extending in the axial direction are integrally formed on the inner peripheral surface thereof. Has been established. On the other hand, the inner cylinder 3 is a cylindrical bottomed cylindrical body having one end closed and the other end opened, and an annular seal portion 31 made of an annular projection is integrally provided on the inner peripheral surface near the open end. I have.

The vertical rib 4 is provided on the annular seal portion 3 of the inner cylinder 3.
1 is connected to the outer peripheral surface at a position above (i.e., a position avoiding the annular seal portion 31) and the inner peripheral surface of the outer cylinder 2. That is, since the vertical ribs 4 are not formed on the outer peripheral surface of the annular seal portion 31 and the annular gap 5 is formed, the thickness of the annular seal portion 31 in the radial direction can be made uniform. The seal portion 31 does not have sink marks during molding.

The lower end of the vertical rib 4 extends downward in the axial direction and is located below the opening end of the inner cylinder 3 (ie, between the opening end of the inner cylinder 3 and the opening end of the outer cylinder 2). 2 is located on the inner peripheral surface. All the lower ends of the vertical ribs 4 are formed in a tapered shape inclining radially inward as going upward in the axial direction, and serve as guide portions 41 for guiding the pen tip inward when the pen tip comes into contact. ing. Further, the gap between the vertical ribs 4 is set to be sufficiently smaller than the outer diameter of the pen tip, so that the pen tip does not penetrate there and is not damaged.

Further, four planar projections 21 are integrally formed below the vertical ribs 4 on the inner peripheral surface of the outer cylinder 2. The planar projections 21 prevent the cap 1 from wobbling when fitted to the pen tip side of the writing implement main body, and serve as a fitting portion when fitted rearward to the tail end side of the writing implement main body.

The synthetic resin material constituting the cap 1 of the present invention includes, for example, polypropylene, polyethylene, polycarbonate, polyethylene terephthalate and the like.

The cap 1 of the present invention is applicable to, for example, a writing instrument such as a marking pen, a felt-tip pen, a ball-point pen, a pipe pen, a fountain pen, or an applicator such as a correction liquid, a cosmetic liquid, or an adhesive.

[0019]

According to the first aspect of the present invention, a cap for a writing instrument or the like has a simple mold structure, does not cause poor airtightness, suppresses damage to a pen tip, and has a smooth air flow. Becomes possible.

According to the present invention, there is provided a cap for a writing instrument or the like.
With this configuration, the insertability of the pen tip can be further improved, and damage to the pen tip can be avoided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a cap such as a writing instrument of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a plan view of FIG. 1;

FIG. 5 is a bottom view of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap 2 Outer cylinder 21 Plane projection 3 Inner cylinder 31 Annular seal part 4 Vertical rib 41 Guide part 5 Annular clearance 6 Air passage

Claims (2)

[Claims] 1. An inner cylinder (3) comprising a bottomed cylinder having an annular seal portion (31) on the inner peripheral surface for sealingly fitting with a writing instrument body.
And the inner peripheral surface of the outer cylinder (2) with both ends open,
A cap (1) such as a writing implement made of a synthetic resin molded body integrally connected to each other through a longitudinal rib (4) extending in the axial direction so as to allow air flow, and a plurality of caps extending in the axial direction on the inner peripheral surface of the outer cylinder (2). The vertical ribs (4) are integrally provided, and the vertical ribs (4) allow the inner peripheral surface of the outer cylinder (2) and the outer peripheral surface of the inner cylinder (3) above the annular seal portion (31) to be formed. An air passage (6) is formed between the longitudinal ribs (4), and an outer peripheral surface of an annular seal portion (31) of the inner cylinder (3) and an inner peripheral surface of the outer cylinder (2) are connected. A cap such as a writing instrument, wherein an annular gap (5) is provided therebetween, and a lower end of the vertical rib (4) extends below an opening end of the inner cylinder (3). 2. A cap for a writing instrument or the like according to claim 1,
The lower end of the vertical rib (4) has a tapered shape inclining inward as going upward, and a guide portion (41) for guiding the pen tip inward is formed at the lower end of the vertical rib (4). Characteristic writing instrument caps.