JPH0890984A - Cap for writing utensil - Google Patents

Abstract

PURPOSE: To prevent the quality of the cap for a writing utensil from lowering due to gate remains by a method wherein a head crown is provided at the top part of the main body of the cap for the writing utensil under the condition that the main body is made of a transparent synthetic resin and the head crown is made of an opaque material and a projected part is provided at the top part of the main body so as to position the gate part for injection molding at the top part of the main body. CONSTITUTION: The main body 1 of a cap for a writing utensil is an injection molded article of a transparent synthetic resin such as a copolyester resin of polycyclohexylene terephthalate and polyethylene terephthalate, on the side face of which a chip 11 is integrally provided. At the top part of the main body 1, a mounting hole 4 for mounting a head crown 7 made of an opaque material is formed so as to protrusively provide a projected part 2 at the bottom of the mounting hole 4 in order to position the gate part 3 for injection molding at the top part of the projected part 2. Further, a stepped part 41 and an annular projection 42 are provided on the inner peripheral wall of the mounting hole 4 so as to abut the frame-like ceiling plate part 71 of the head crown 7 against the stepped part 41 and, at the same time, engage an annular projection 72a provided on the head crown 7 side with the annular projection 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument cap. More specifically, the present invention relates to a writing instrument cap having a crown for identification of ink color, handwriting width, etc., and a crown for the purpose of decoration and the like.

[0002]

2. Description of the Related Art Conventionally, in a writing instrument cap, a structure in which a crown for displaying ink color is attached to the top of the cap is widely known. (For example, actual fairness 2-999
(Publication No. 5)

[0003]

However, in the above-mentioned conventional writing instrument cap, the identification mark such as the ink color is easily visible from the top surface of the cap, but is difficult to see from the side surface of the cap. In order to solve this, it is conceivable to increase the outer protrusion of the crown, but if the protrusion amount is increased, the crown easily comes off from the cap. In addition, infants may swallow the fallen crown by putting it in their mouth.

Further, in recent years, the structure of making the cap transparent has been widely adopted. However, when the cap is formed by injection molding of a transparent synthetic resin material, whitening or turbidity occurs at the gate portion and the vicinity of the gate portion at the time of injection molding. Occurs and the aesthetics are impaired. Also, the aesthetic appearance tends to be impaired by the remaining gates.

The present invention solves the above-mentioned problems of the prior art, and allows the crown to be easily visually recognized without significantly protruding to the outside, and moreover, by the gate portion for injection molding. An object of the present invention is to provide a writing instrument cap that does not impair the overall aesthetics.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a writing instrument cap in which a crown 7 is provided on the top of the body 1, wherein the body 1 is made of a transparent synthetic resin and the crown 7 is made of an opaque material. Then, the convex portion 2 is provided on the top of the main body 1, and the gate portion 3 for injection molding is positioned on the top of the convex portion 2.
It is a requirement that a recess 73 is provided in the crown 7 and the projection 2 is in the inserted state in the recess 73.

The crown 7 preferably has the same or substantially the same color as the ink color of the writing instrument so as to display the ink color. Specifically, there may be mentioned a structure formed of a synthetic resin material colored in the same or substantially the same color as the ink color, a structure formed of a metal material whose surface is colored, and the like.

Further, it is preferable that a pen tip seal member 8 made of an opaque synthetic resin is arranged below the convex portion 2 in the main body 1 or below the partition wall 6. The pen tip seal member 8 may be disposed inside the recess 73 of the crown 7 in addition to the position below the crown 7. Further, it is preferable that the pen tip seal member 8 is made of an elastic material having the same color or substantially the same color as the ink color.

The crown 7 has an identification mark 71 on the outer surface.
a top plate portion 71 provided with a and the main body 1 and the recess 7
The configuration including the tubular portion 72 having 3 is preferable. Specific examples of the identification display 71a include identification information including characters and figures such as pen tip size, handwriting width, pen tip shape, and pen tip type. The identification display 71a can be configured by printing or engraving, or by attaching another member (seal or the like).

Examples of the material of the main body 1 include transparent synthetic resins such as polyethylene, polypropylene, polycyclohexane terephthalate, polycarbonate and methacrylic resin.

As the material of the crown 7, for example, synthetic resin such as ABS, polyacetal, polyethylene, polypropylene, metal or the like is effective. Alternatively, a synthetic resin having elasticity such as rubber elastomer may be used.

Synthetic rubber (for example, silicon rubber, urethane rubber, ethylene-propylene rubber, styrene-butadiene rubber, fluororubber, etc.), natural rubber or the like is effective as the material for the pen tip seal member 8.

[0013]

The cap body 1 is made transparent, so that the crown 7 does not largely project to the outside, and the crown 7 can be sufficiently visually recognized from the side surface of the body 1 to identify ink colors and the like. The information can be easily discriminated. Further, the convex portion 2 that tends to be whitened by injection molding can be hidden from the outside by being inserted into the concave portion 73 of the crown 7, and the appearance of the entire cap is not impaired.

By disposing the opaque nib seal member 8 below the convex portion 2, the convex portion 2 which tends to be whitened can be hidden from below the cap body 1 (in the opening direction). You can

Further, the color of the ink can be visually recognized because the crown 7 is the same color or substantially the same color as the ink color, and the identification mark 71a on the top plate portion 71 relates to the pen tip, the handwriting width and the like. The identification information can be visually recognized at the same time.

[0016]

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

1 to 3 show a first embodiment of the present invention. The main body 1 is formed by injection molding of a transparent synthetic resin (specifically, a copolyester resin of polycyclohexylene terephthalate and polyethylene terephthalate).
A clip 11 is integrally provided on the side surface of the main body 1. Further, a mounting hole 4 for mounting the crown 7 is provided on the top of the main body 1, and a convex portion 2 is projectingly provided on a bottom portion of the mounting hole 4, and a top portion of the convex portion 2 further includes: The gate part 3 for injection molding is located. A step portion 41 and an annular protrusion 42 are provided on the inner peripheral wall of the mounting hole 4,
The flange-shaped top plate portion 71 of the crown 7 is brought into contact with the stepped portion 41, and the annular protrusion 42 and the annular protrusion 72a provided on the crown 7 side are fitted over each other.

Further, at the bottom of the mounting hole 4 of the main body 1,
A partition wall 6 is formed, and an insertion hole 5 into which the writing instrument main body can be freely inserted is provided below the partition wall 6. The insertion hole 5
The pen tip seal member 8 is press-fitted into the bottom of the. In detail, the pen tip seal member 8 has an outer peripheral portion with an insertion hole 5
A planar pressure contact portion 51 provided on the inner wall of the bottom portion and supported from four directions
(The inscribed circle diameter is slightly smaller than the outer diameter of the pen tip seal member 8) and at the same time, the rear end portion is brought into contact with the partition wall 6. Then, a gap 52 is formed between each of the planar pressure contact portions 51, which prevents compression of air when press-fitting the pen tip seal member 8 into the bottom portion of the insertion hole 5. Smooth installation work is possible (see Fig. 2).

The pen tip seal member 8 includes a thick annular support portion 81 and a thin-walled concave seal portion 82 at the center thereof.
It is integrally formed of an elastic material (for example, ethylene-propylene rubber) colored in substantially the same color as the ink color of the writing instrument.

The crown 7 is composed of a tubular portion 72 and a top plate portion 71 protruding in a brim shape, and is integrally formed of a material (ABS resin) colored in substantially the same color as the ink color. The cylindrical portion 72 is provided with an annular protrusion 72a for fitting over the outer peripheral surface. Further, a concave portion 73 is formed inside the cylindrical portion 72, and the gate portion 3 is formed in the concave portion 73.
The convex portion 2 having is in an inserted state.

On the surface of the top plate portion 71 of the crown 7, "0.
The identification display 71a "3" is printed in white (FIG. 3). In this embodiment, a ballpoint pen is used as a writing tool, and the tip of the pen tip of the ballpoint pen has an outer diameter of 0.
A 3 mm carbide ball is rotatably held. That is, "0.3" indicates the outer diameter of the ball. This allows you to determine the size of the pen tip of the ballpoint pen without having to remove the cap and do trial writing, which is a guideline for the thickness of the handwriting when the user purchases or uses it. The diameter can be seen at a glance.

When the cap body 1 is viewed from the outside, the body 1 made of a transparent synthetic resin material has a color indication by two points, a crown 7 and a pen tip sealing member 8 which are colored in almost the same color as the ink color. Strongly identified. Further, when looking at the top surface, the ink color and the outer diameter dimension of the ball (identification display 71a) can be discriminated simultaneously.

FIG. 4 shows a second embodiment of the present invention. Body 1
Are formed of transparent synthetic resin. Further, a convex portion 2 (the gate portion 3 for injection molding is located on the top portion thereof) is provided on the top of the main body 1, and a crown 7 is fitted on the convex portion 2.

Below the convex portion 2, an insertion hole 5 is provided through which a writing instrument body can be inserted via a partition wall 6. Four ribs 53 are provided on the bottom of the insertion hole 5, and the nib seal member 8 is press-fitted and fixed by the ribs 53.

The crown 7 is a cylindrical body with a bottom,
Similar to the embodiment, it is composed of a top plate portion 71 and a cylindrical portion 72, and is integrally formed of a synthetic resin material having substantially the same ink color as the writing instrument. On the surface of the top plate portion 71, an identification display 71a, which is a number "0.15" or ".15" indicating the handwriting width (mm), is provided (not shown). In the present embodiment, a ballpoint pen or a small pen is considered as the main body of the writing instrument. In order to have the above handwriting width (0.15 mm), in the case of a ballpoint pen, the outer diameter of the tip ball is 0.3 mm, and in the case of a small pen. , And set the outer diameter of the tip to 0.15 mm. Further, on the inner peripheral wall of the concave portion 73 or the outer peripheral wall of the convex portion 2 of the cylindrical portion 72, a protrusion or a groove for fitting can be provided.

The pen tip seal member 8 has a disk shape, and is made of an elastic material having substantially the same color as the ink color of the writing instrument.
In addition, the pen tip seal member 8
The seal portion 82 is recessed.

FIG. 5 shows a third embodiment (a modification of FIG. 4). The pen tip seal member 8 is a spherical elastic body, and the main body 1
It is attached by press fitting from the insertion hole 5 side to the inner hole 21 of the convex portion 2. Further, most of the pen tip seal member 8 is located in the recess 73 of the crown 7 and hidden from the outside by the crown 7, and the pen tip seal member 8 does not need an ink color display function. Therefore, it is black in this embodiment. The other structure is the same as that of the second embodiment.

In addition to the above-mentioned embodiment, although not shown, the identification mark 71a is provided on the outer peripheral surface of the cylindrical portion 72 of the crown 7, the clip is integrally provided on the crown, or metal or the like is used. A configuration in which a separate clip made of is provided can also be appropriately adopted.

Although not shown, the pen tip seal member 8 can be disposed in the cap body 1 so as to be movable in the axial direction.

[0030]

EFFECTS OF THE INVENTION The writing instrument cap of the present invention has the above-described structure, so that the writing cap can be easily visually recognized without the protrusion of the crown to the outside, and the appearance of the whole is impaired by the gate portion for injection molding. Never be

Further, by disposing an opaque pen tip sealing member in the main body, it is possible to hide the convex portion, which tends to be whitened, from below the cap main body.

Further, in addition to the fact that the color of the ink of the writing instrument can be discriminated by the crown that is the same or substantially the same color as the ink color, the identification information on the top plate portion of the crown can be used to identify the pen tip, handwriting width, etc. Can be easily discriminated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

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

FIG. 3 is an external view showing a top surface of the first embodiment.

FIG. 4 is a vertical sectional view of a second embodiment of the present invention.

FIG. 5 is a vertical sectional view of a third embodiment of the present invention.

[Explanation of symbols]

 1 Main body 11 Clip 12 Vent hole 2 Convex part 21 Inner hole 3 Gate part 4 Mounting hole 41 Step part 42 Annular protrusion 5 Insertion hole 51 Surface pressure contact part 52 Gap 53 Rib 6 Partition wall 7 Crown 71 Top plate part 71a Identification Display 72 Cylindrical part 72a Annular projection 73 Recess 8 Pen tip seal member 81 Annular support part 82 Seal part

Claims (4)

[Claims] 1. A writing instrument cap having a crown (7) on the top of the body (1), wherein the body (1) is made of a transparent synthetic resin and the crown (7) is made of an opaque material. Then, the convex portion (2) is provided on the top of the main body (1) and the gate portion (3) for injection molding is positioned on the top of the convex portion (2), and the concave portion (73) is formed on the crown (7). ) Is provided, and the convex portion (2) is provided inside the concave portion (73). 2. The crown (7) is the same or substantially the same color as the ink color of the writing instrument so as to display the ink color of the writing instrument.
Writing instrument cap described. 3. The writing instrument cap according to claim 1, wherein a pen tip seal member (8) made of an opaque synthetic resin is provided in the main body (1). 4. The crown (7) has an identification mark (71a) on its outer surface.
The writing instrument cap according to claim 1, 2 or 3, which comprises a top plate portion (71) provided with and a tubular portion (72) fixed to the main body (1).