JP2004130681A - Writing utensil cap and molding die structure for writing utensil cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-priced and high safety writing utensil cap which is simply structured of a few number of components with an outstanding appearance and the easiness to highlight its design features, and a molding die structure for molding this cap. <P>SOLUTION: This writing utensil cap is structured of a cap body (1) having an attachment part (9) to a writing utensil body and a clip (2) formed on the cap body (1). The writing utensil cap is double-molded and the clip (2) comprises a clip support (4) fixed to the clip body (1) and a clip piece (3) supported by the clip support (4). At least either of the cap body (1) or the clip support (4) has vent holes (7 and 8) which make the interior of the cap body (1) communicate with the outerior. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a writing instrument cap and a writing tool cap forming mold structure.
[0002]
[Prior art]
A writing instrument cap having a cap body and a clip is known for protecting a pen point at the tip, preventing ink volatilization, carrying in a pocket, and preventing rolling on a desk. A writing instrument cap generally includes a cylindrical cap body provided with a concave-convex fitting portion on the writing instrument body side, and a separate or integrated clip on the upper portion of the cap body (opposite to the opening of the cap body). .
When the cap is formed by injection molding, it is often molded integrally. In this case, the cap body and the clip are completely the same color, so the appearance design cannot be changed much, and it is used for low-grade products. It is often done.
Further, in the case where the clip as disclosed in Japanese Patent Application Laid-Open No. 2002-172887 or Utility Model Registration No. 2595554 is a separate body, a sufficient strength is required for the clip attaching portion, although the coloring and the like can be changed. Therefore, there are problems such as an increase in the size of the mounting portion and a problem of material restrictions, and a great deal of design and design considerations have been required.
[Patent Document 1] Japanese Patent Application Laid-Open No. 2002-172887 [Patent Document 2] Japanese Utility Model Registration No. 2595554
As a countermeasure for ensuring breathing at the time of accidental ingestion of the cap, there have been known ones in which an air flow path is secured around the attachment portion of the clip piece, and those in which a hole is simply formed in the cap ceiling.
The one with the cap body and the clip as a separate body improves the discriminability of the appearance, but it is difficult to increase the hole size for ventilation, the mounting space and the wall thickness are increased, Problems often arise, such as the mounting portion becoming conspicuous due to the problem of mounting strength, the total length of the writing implement becoming longer, and the outer diameter increasing.
[0004]
In the double molding, after molding the primary side, the molded article is left in the mold or is put in the mold to perform the secondary side molding, or by simultaneously molding the two resins, an integrated molded article without assembling is required. This is a method of obtaining a mold, and various mold structures are employed.
Ordinary double molding is such that two resins such as a shaft and a rubber grip overlap in a ring shape, and the resin on the secondary side covers the upper part of the resin on the primary side.
As the mold structure of the writing instrument cap, it is necessary to secure a ventilation hole for safety, and it is necessary to provide a clip that is elastically deformed, so that a particularly difficult structure is often required.
[0005]
[Problems to be solved by the invention]
If the conventional clip is simply molded integrally with the cap body, there is a problem that the appearance cannot be differentiated as described above. Therefore, it is desirable that the writing tip be configured to be visible from the outside. Furthermore, it is preferable in terms of safety to ensure ventilation at the time of accidental ingestion.
In the case where the clip and the cap main body are separated from each other, there are assembly problems that require complicated assembly, and the provision of the clip attachment portion results in an increase in the thickness, the length of the writing implement, and an increase in the design.
With respect to writing instrument caps, the mold structure required from the viewpoint of design differentiation is also becoming more difficult. Particularly in the case of a double-molded mold structure, it is desired to take into account the multi-cavity. I have.
The present invention has been made by focusing on the problems of the above-described conventional technology, and has a simple configuration with a small number of parts, has an excellent appearance, is easy to develop a design property, is inexpensive, has a highly safe writing instrument cap and An object is to provide a mold structure for molding the cap.
[0006]
[Means for Solving the Problems]
To solve the above problems, the following means are provided.
A writing instrument cap as a first means for solving the problem is a writing instrument cap including a cap body having a mounting portion to the writing instrument body and a clip provided on the cap body, and the writing instrument cap is formed by double molding. The clip is formed by a clip support portion fixed to the cap body and a clip piece supported by the clip support portion. At least one of the cap body and the clip support portion includes the cap body A ventilation hole is provided for communicating the inside with the outside.
The writing instrument cap according to this means is formed by double molding such as double simultaneous molding or insert molding. The ventilation hole may be single, plural, round, irregular, window-shaped or groove-shaped.
[0007]
The second solving means is limited to the first problem solving means, provided with a writing tip visual recognition portion so that the writing tip of the writing instrument body can be seen from the outside when the writing instrument cap is attached to the writing instrument body, The writing tip visual recognition portion is provided at a position facing the ventilation hole with the cap body interposed therebetween.
As a specific form of forming the writing tip visual recognition portion, for example, there is a mode in which at least the vicinity of the writing tip of the cap body, the clip support portion, and the clip piece when the cap is attached is made transparent, translucent, or a window. Furthermore, by making the cap body transparent, translucent, etc., and providing the clip support portion at a position other than near the writing tip when attaching the cap, that is, by providing it so that it does not overlap with the writing tip, the writing tip is also from the outside. Can be visible.
[0008]
A third object of the present invention is to provide a writing tool cap molding die structure for forming a cap body having a mounting portion to the writing tool body and a clip comprising a clip support portion and a clip piece by double molding. A projection is formed on the main body core pin, and at least the projection is brought into contact with the cap body cavity during molding of the cap body, and at least the projection is brought into contact with the clip cavity during molding of the clip. .
A projection is formed on the core pin forming the inner diameter side of the cap body, and at least the projection is applied to the cap body cavity (including the case where a pin is inserted into the cavity, hereinafter similarly referred to as a cavity) at the time of molding the cap body. At the time of molding the clip, at least the projection is brought into contact with the clip cavity. It should be noted that the case where projections are also formed on the cap body cavity and the clip cavity and the projections formed on the cap body core pins abut on these projections is not excluded.
Since the projection always contacts the cavity and the resin does not flow in, the portion becomes a through hole, and a ventilation hole for securing breathing during accidental ingestion can be formed.
[0009]
The fourth solution is a solution of the third solution, wherein the clip cavity is applied to the cap body at a position where the core pin of the cap body is a symmetric axis and the projection is centered on the object axis. A contact portion to be brought into contact is provided, and the cap body core pin is configured to be sandwiched between the protrusion and the contact portion.
[0010]
A fifth object of the present invention is to provide a writing tool cap molding die structure for forming a cap body having a mounting portion to the writing tool body and a clip including a clip support portion and a clip piece by double molding. A first projection is formed in the main body cavity, and at least the projection is brought into contact with the core pin of the cap main body when molding the cap main body, and a second projection is formed in the clip cavity. The present invention is characterized in that the first and second projections are in contact with the main body core pin, and the positions where the first and second projections are in contact with the cap main body pin are the same. The case where the projection is also formed on the core pin of the cap main body and the first projection of the cap main body cavity and the second projection of the clip cavity are brought into contact with this projection is not excluded.
Since the first and second projections always contact the cavity and also contact the same portion of the core pin of the cap body, the resin does not flow into the contact portion. Can be.
[0011]
A sixth aspect of the present invention is a modification of the fifth aspect of the present invention, wherein the cap body core pin has a symmetric axis, and the clip is provided at a position opposed to the first and second projections about the target axis. An abutment portion for bringing the cavity into contact with the cap body is provided, and the cap body core pin is sandwiched between the second protrusion and the abutment portion.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In a writing instrument equipped with a cap for protecting the pen tip and preventing volatilization of the internal ink, for example, a method of providing a clip on the cap body includes a method of forcibly inserting the clip into a mounting portion of the cap body, and a method of fitting unevenly. Generally, a method of fixing with a retaining part such as a screw or a screw is used.
When the clip is made of metal, it has been relatively easy to prevent the clip from slipping off by providing the clip with a notch and press-fitting the clip. However, since the ink colors of recent ballpoint pens range from black, red, blue, etc. to several tens of colors from gold to silver, decoration of caps and clips has become important for differentiation, and colored transparent In addition to the demands for coloring such as lacquer and lame, it is necessary to give superiority in shape and material.
[0013]
As the material of the cap body, CoPET (alloy resin of copolymerized polyester and PET (polyethylene terephthalate) resin), PC (polycarbonate resin), elastic acrylic (soft acrylic resin), PP (polypropylene resin), soft styrene resin, etc. are used. Of these, CoPET and elastic acryl are often used in recent years due to their transparency, luster, cap fitting properties, and the like.
However, these CoPET and elastic acrylic resin have a practical heat resistance temperature of 70 ° C. or less, and have a somewhat low heat resistance in consideration of use in a car in summer, etc. Therefore, the press-fitting distance of the clip is required for press-fitting and fixing the clip. It was necessary to take measures such as lengthening, press-fitting, and fixing with separate parts.
Also, PC has problems such as chemical resistance and fitting durability, and PP has problems such as lack of transparency, gloss, and printability of appearance.
Usually, it becomes a writing implement of a large size by the size of the attachment part where the clip is attached. If the clip and the cap body are simply integrated, the size problem will be eliminated, but the appearance will not change the color or the degree of freedom of the shape, so it will be a cap generally used only for very low grade products Alternatively, there is an inconvenience that the cost for differentiation is increased, such as performing printing such as printing twice on the clip portion, or the productivity is deteriorated.
[0014]
Clips are made of PC, ABS, elastic acrylic, PP, etc., which are materials that have strength and rigidity that are difficult to break when the clip is lifted, but in all cases, writing implements that are large enough for the size of the mounting part Is required.
In addition, there is an invention in which a concave portion is provided in the cap body and the clip is fitted in a ring shape.
[0015]
(Embodiment 1)
Embodiment 1 of the present invention will be described in detail with reference to FIGS.
A writing instrument cap including a cap body 1 having an uneven fitting portion 9 as an attachment portion to the writing instrument body and an opening edge 14, and a clip 2 provided on the cap body 1. The clip 2 is fixed to the cap body 1. And a clip piece 3 supported by the clip support 4. The cap body 1 and the clip 2 are formed by double molding.
[0016]
The material of the clip 2 is a material that is elastically deformed when the clip piece 3 is lifted, such as being inserted into or removed from a pocket or the like, and is used as a normal clip (PC, ABS, PP, acrylic, CoPET, PET, PE, PS and the like, and kneaded alloys, elastic grades, inorganic substances, colorants, and the like thereof, and recycled materials thereof can be used. The material of the cap body 1 is, for example, CoPET (alloy resin of copolymerized polyester and PET (polyethylene terephthalate) resin), PC (polycarbonate resin), elastic acrylic (soft acrylic resin), PP (polypropylene resin), soft styrene resin and the like. No.
On the inner surface side of the clip support portion 4, a retaining portion 5 protruding inward of the cap body 1 is provided, and the retaining portion 5 is located behind the opening edge 14 of the cap body 1 for inserting and removing the writing tip ( (Writing instrument insertion side). This makes it possible to securely and securely lock the clip 2 to the clip body without increasing the size of the entire cap.
[0017]
In the first embodiment, the clip support portion 4 includes a base portion 4-a for supporting the clip piece 3 and a base portion 4-b serving as a portion to be attached to the cap body 1, and a tongue-shaped clip is formed from the cylindrical portion 4-b. The retaining portion 5 is made to protrude rearward (on the writing implement side) from the opening edge 14 of the cap body 1. The retaining portion 5 projects inward (in the axial direction of the cap body) behind the opening edge 14, and when a load acts on the clip 2 and the clip 2 comes off from the cap body 1, the clip 5 2 suppresses extraction.
Further, a front end stopper 11 is provided near the distal end of the clip 2 for preventing the clip 2 from coming off from the clip main body 1 when the load is applied to the clip 2 and the clip 2 comes off from the cap main body 1. The front end retaining portion 11 does not necessarily need to be at the front end. Any method can be used as long as the clip 2 can be prevented from falling backward.
[0018]
The clip piece 3 was provided integrally with a clip support 4 fixed to the cap body 1. Since the cylindrical portion 4-b that receives the stress even when the clip 3 is lifted is provided, problems such as loosening of the clip hardly occur.
It is advantageous in terms of strength that the cylindrical portion 4-b covers the entire cap body 1, but there is a drop-out in the middle of the cylindrical portion 4-b of the clip support portion as shown in FIG. 2 of the first embodiment. Alternatively, the clip window 10 may be modified to have a different shape. In this case, design differentiation can be achieved. Further, a clip retaining portion 5 of the clip 2 is provided at a position facing the clip piece 3 with the cap body 1 interposed therebetween. Since the clip 3 is lifted and used, even when a load acts on the clip 3 and the clip 2 comes off from the cap body 1, the retaining portion 5 is locked or engaged with the opening edge 14 of the cap body 1. Since the clip 2 can come into contact with the clip 2, the clip 2 is superior to the forward drop or swing.
[0019]
Usually, an attachment portion between the cap body 1 and the clip 2 is required, and the clip 2 is often used with relatively large stress applied thereto. In this embodiment, since the cap is a double molded cap, it is not necessary to consider the mounting portion so much, and the appearance can be made superior.
[0020]
Many writing implement caps have been proposed that have ventilation performance in order to cope with an accident in which an infant or the like accidentally ingests the food accidentally and suffocates. With ordinary clips that are not double molded, ventilation holes can be simply secured by merely providing holes. However, in the case of double molding, even if a hole is made in the primary side, the resin on the secondary side There is a problem that the hole is closed when the water flows. As will be described in detail later, since the same continuous clip ventilation hole 7 and cap main body ventilation hole 8 are provided on the primary side and the secondary side, ventilation can be reliably performed without blocking the ventilation holes.
[0021]
The cap main body 1 is formed of a transparent, translucent, colored transparent, or other internally visible resin, and the clip 2 is formed of a colored translucent or colored opaque resin such as an ink color or a shaft color. The window portion 10 as a writing tip visual recognition portion was formed so that the writing tip could be seen from the outside when the writing tip was attached to the writing instrument body.
By providing the clip support portion 4 at a position other than the vicinity of the writing tip when attaching the cap, that is, by providing the clip supporting section 4 so as not to overlap with the writing tip, the writing tip can be seen from the outside.
In the present embodiment, the writing tip (not shown) can be inserted to the vicinity of the front end of the cap body 1, and the type and color of the writing tip can be easily recognized.
Furthermore, a clip window 10 is provided as a writing tip recognition portion so that the writing tip of the writing instrument main body can be seen from the outside when the writing instrument cap is attached to the writing instrument main body. Are provided at positions opposed to the clip ventilation hole 7 and the cap main body ventilation hole 8 which are ventilation holes. Light can enter the inside of the cap body 1 from the clip ventilation hole 7 and the cap body ventilation hole 8, so that the internal visibility from the clip window 10 can be improved. If only the window is opened, the interior is often dark and the color or the like cannot be seen.
[0022]
The present embodiment does not have a conventional mounting portion for mounting the cap body 1 and the clip 2, and is a writing instrument cap that is smart in appearance.
In addition, in order to make it easy to insert and remove the writing instrument main body, it is more preferable to take measures such as making the periphery of the retaining portion 5 tapered.
[0023]
Further, the vent hole for securing ventilation when the cap is accidentally ingested can be integrally formed, and the cap body 1 and the clip 2 can be provided with a certain degree of adhesion without gaps, so that they can be prevented from falling off. It is possible to easily improve the stopping performance and the like and to minimize the thickness.
In insert molding, double molding can be performed by molding the cap body 1 normally, inserting the cap body 1 into a clip mold, and then molding the clip 2.
In the case of such a double molding, it is possible to provide a writing instrument cap excellent in design and appearance without any assembling.
[0024]
(Embodiment 2)
A mold apparatus for obtaining a cap according to the first embodiment of the present invention is shown in FIGS.
As shown in the figure, a gate (not shown) is provided in a space to be a product part by combining steel materials and the like, and the molten resin is injection-molded at a high speed and a high pressure via the gate. In the present invention, the product is taken out in a state where the cap body 1 and the clip 2 made of resin of different materials are integrated by double molding. It is preferable that the cap body 1 and the clip 2 are made of different colors.
In the case of double molding in this embodiment, as shown in FIG. 10, first, a primary space 104 that forms the shape of the cap body 1 that is the primary shape is formed by the cap body core pin 101 and the cap body cavity. The tee 102, the primary side base 103, the ejector 111 and the like are formed, and the interior of the primary side space 104 is filled with resin by injection molding. Thereafter, the portion of the clip 2 on the secondary side shown in FIG. 11 is injection-molded, and the space 109 shown in the figure is filled with resin to obtain a cap in which the primary side and the secondary side are integrated. It is a type structure.
[0025]
In the second embodiment, a projection 101a is provided on a cap body core pin 101 forming the inner diameter side of the cap body 1, and the projection 101a is brought into contact with the cap body cavity 102 to form a contact portion 105. To prevent resin from flowing into
Thereafter, only the cap main body cavity portion 102 is rotated, or the cap main body 1 is taken out and the orientation is adjusted, and the secondary mold is used to form a close contact with the space other than the space 109 to become the clip 2 as shown in FIG. Then, the clip 2 is integrally molded with the cap main body 1 in a state of being closely adhered or welded thereto.
At this time, the projection 101a of the cap body core pin 101 also contacts the clip cavity 107 on the secondary side as well as the contact on the primary side to form a contact portion 105, and the cap body of the primary side cap body 1 The ventilation hole 8 and the clip ventilation hole 7 of the clip 2 on the secondary side can be completely connected.
[0026]
Further, as shown in FIG. 11, when the cap main body core pin 101 is a symmetric axis and the symmetric axis is the center, the clip cavity 107 is located at a position facing the projection 101a (axially symmetric with respect to the symmetric axis). A contact portion 107a for contacting the cap body 1 with the cap body 1 is provided, and the cap body core pin 101 is sandwiched between the protrusion 101a and the contact portion 107a. Note that a clip window 10 is formed at a contact portion between the clip cavity 107 and the cap body 1.
With such a configuration, a mold configuration capable of preventing fluctuation due to the injection pressure, generation of burrs, and the like is provided.
[0027]
(Embodiment 3)
In the third embodiment, as shown in FIG. 12, a second projection 107b is provided in the clip cavity 107 to abut on the core pin 101 of the cap body to form an abutting portion 105.
Although not shown, the first projection formed in the cap body cavity is brought into contact with the cap body core pin 101 before the second projection 107b is brought into contact with the cap body core pin 101, and the cap body 1 A certain primary side cap body 1 was formed.
This figure shows a state in which the second projection 107b is in contact with the same location where the first projection abuts on the cap body core pin 101.
Further, in this drawing, a contact portion for bringing the clip cavity 107 into contact with the cap body 1 at a position facing the first and second projections with the cap body core pin 101 as the axis of symmetry and the object axis as the center. 107a is provided, and the cap body core pin 101 is sandwiched between the second protrusion 107b and the contact portion 107a.
The second embodiment has exactly the same operation and effect as those of the second embodiment, although the projection position is different.
[0028]
In the above-described second and third embodiments, there are no restrictions on the position or shape of the gate, the ejector, and the like, and any structure may be used as long as the structure of the present invention is satisfied. Note that the first and second protrusions may be brought into contact with different portions of the cap body core pin without making contact with the same portion.
[0029]
The embodiment of the present invention is an example, and a detent rib can be added, and the shape, number, and height of the detent can be changed. It is also possible within the scope of the invention to make the cap cross section irregular.
The thickness of the cap body 1 is 0.3 to 1.5 mm, the thickness of the clip 2 is 0.4 to 3 mm (more preferably 0.5 to 1.5 mm), and the clip retaining portion 5 is located outside the cap body 1. It is desirable that the protrusion amount (lock amount) be 0.1 to 1.5 mm inward from the surface.
More preferably, the material of the cap body 1 and the clip 2 should have appropriate adhesion, such as CoPET and PC, and heat resistance such that the primary resin does not extremely melt during molding of the secondary side. Further, in the case of a combination having a difference in melting temperature of 20 degrees or more, the two are not completely adhered to each other, and the present invention is more effective. Further, a shape in which the positions of the clip 2 and the cap main body 1 are reversed (there is a portion where the clip has sunk inside and the cap main body 1 has come out to the outside) can be adopted.
[0030]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, it is possible to provide a writing instrument cap and a mold structure for molding the cap, which have a simple configuration with a small number of parts, a highly safe ventilation hole, and do not require assembly.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a cap applied to a first embodiment of the present invention.
FIG. 2 is a lateral front external view of a cap applied to the first embodiment of the present invention.
FIG. 3 is a top external view of a cap applied to the first embodiment of the present invention.
FIG. 4 is a right side external view of a cap applied to the first embodiment of the present invention.
FIG. 5 is a sectional view taken along line DD of FIG. 1;
FIG. 6 is a sectional view taken along line CC of FIG. 1;
FIG. 7 is a sectional view taken along the line BB of FIG. 1;
FIG. 8 is a sectional view taken along line AA of FIG. 1;
FIG. 9 is a bottom external view of a cap applied to the first embodiment of the present invention.
FIG. 10 is a vertical sectional view of a mold of a primary side cap main body applied to a second embodiment of the present invention.
FIG. 11 is a vertical sectional view of a mold of a secondary clip applied to the second embodiment of the present invention.
FIG. 12 is a vertical sectional view of a die of a cap applied to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cap main body 2 Clip 3 Clip piece 4 Clip support part 4-a Clip support part Base part 4-b Clip support part Tube part 5 Clip retaining part 7 Clip ventilation hole 8 Cap main body ventilation hole 9 Cap main body convex and concave fitting part 10 Clip Window (writing tip recognition part)
DESCRIPTION OF SYMBOLS 11 Front end stopper 12 Core groove 13 Cavity groove 14 Opening edge of cap body 101 Cap body core pin 101a Projection 102 Cap body cavity 103 Primary side base 104 Primary side space 105 Contact portion 106 between core and cavity Secondary side base 107 Clip cavity 107a Contact portion 107b (between clip cavity and cap body) Second protrusion 109 Secondary space 111 Ejector

Claims (6)

A cap for a writing instrument comprising a cap body having a mounting portion to the writing instrument body and a clip provided on the cap body,
The writing instrument cap is formed by double molding,
The clip includes a clip support portion fixed to the cap body, and a clip piece supported by the clip support portion,
A cap for writing implements, characterized in that at least one of the cap body and the clip support portion is provided with a ventilation hole communicating between the inside and the outside of the cap body. When the writing instrument cap is attached to the writing instrument body, a writing tip recognition section is provided so that the writing tip of the writing instrument body can be seen from the outside,
2. The writing instrument cap according to claim 1, wherein the writing tip visual recognition portion is provided at a position facing the ventilation hole with the cap body interposed therebetween. A cap body for a writing instrument for forming a cap body having a mounting portion to the writing instrument body, and a clip composed of a clip support portion and a clip piece by double molding,
Form a projection on the cap body core pin,
At the time of molding the cap body, at least the protrusion is brought into contact with the cap body cavity,
A cap molding die structure for a writing instrument, wherein at least the projections are in contact with the clip cavity during clip molding. The cap body core pin has a symmetric axis, and at a position facing the projection about the target axis, a contact portion is provided for bringing the clip cavity into contact with the cap body,
The cap forming die structure for a writing instrument according to claim 3, wherein the core pin of the cap main body is sandwiched between the projection and the contact portion. A cap body for a writing instrument for forming a cap body having a mounting portion to the writing instrument body, and a clip composed of a clip support portion and a clip piece by double molding,
A first protrusion is formed in the cap body cavity, and at least the protrusion is brought into contact with the cap body core pin during molding of the cap body,
A second projection is formed in the clip cavity, and at least the projection is brought into contact with the core pin of the cap body during clip molding,
A location where the first and second projections abut against the core pin of the cap body is the same, and a die structure for forming a cap for a writing instrument is provided. A cap body core pin is set as a symmetric axis, and at a position facing the first and second projections about the target axis, a contact portion is provided for bringing the clip cavity into contact with the cap body,
6. The cap molding die structure for a writing instrument according to claim 5, wherein the core pin of the cap body is sandwiched between the second protrusion and the contact portion.

Images