JP2002086978A - Pen core holding structure for writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the type of a holder, which can be manufactured by a cost lower than the bondingly fixing type of the conventional plastic holder, the caulkingly working type of the conventional metal holder or the like and, at the same time, which accelerates the improvement of its productivity. SOLUTION: A plurality of projecting parts 4 are protrusively formed at the inner diametral portion of the bore 2 of a synthetic resin holder member 1 so as to develop states countering writing pressure and giving elasticity therein. By step-polishing working the external shape of an extra fine pen core 11 so as to correspond to the positions of the projecting parts 4 of the holder member 1, a smaller diametral part 12 for introducing the projecting parts 4 is formed by grinding. The projecting parts 4 are continuous pleatedly annularly along the inner periphery of the bore 2 and projectingly formed in a state being slightly inclined towards the inserting direction of the extra fine pen core 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing tool pen core holding structure for holding an ultrafine pen core made of felt material or the like at the tip of a shaft cylinder of a writing tool such as a highlighter pen and a felt-tip pen.

[0002]

2. Description of the Related Art Conventionally, as a pen core holding structure for a writing instrument of this type, there are, for example, an adhesive fixing type using a plastic holder and a caulking type using a metal holder. That is, when the plastic holder is employed, as shown in FIG. 4A, the shaft hole 10 of the plastic holder member 100 fitted into the shaft cylinder of the writing instrument.
After inserting the microfine pen core 102 into the microlens 1, the adhesive 103 is applied and fixed to the microscopic gap between the shaft hole 101 and the microfine pen core 102.

On the other hand, when a metal holder is employed, as shown in FIG. 4 (b), an ultrafine pen core 202 is inserted into a shaft hole 201 of a metal holder member 200 fitted into a shaft cylinder of a writing instrument. After that, the conical cylinder head 203 at the tip of the holder member 200 formed in communication with the shaft hole 201 is subjected to compression stenosis using a caulking tool to fix the ultrafine pen core 202 to the holder member 200. Let it do.

[0004]

However, in such a conventionally proposed pen core holding structure, the adhesive fixing type in the case of a plastic holder is extremely fine due to the protrusion of the adhesive 103 when the adhesive 103 is applied. Pen core 102
Is clogged, and the curing time of the adhesive 103 is required, and the operation takes a long time.

On the other hand, in the crimping type in the case of a metal holder, the inner diameter of the holder member 200 and the outer diameter of the extra fine pen core 202 must be processed with considerably high precision. In this case, when the drill blade cannot be cut any more, burrs are generated, so that a defect in the inner diameter processing occurs and a problem occurs in the crimping state. Further, in the case of a metal holder, an air vent hole cannot be formed unless a plastic holder is further used, so that installation becomes complicated.
In addition, since the holder member itself is made of metal, the holder member 200 itself must be subjected to a plating process as a measure for preventing rust, discoloration and the like. As described above, the conventional caulking processing technique is a very difficult operation, and requires a considerable amount of skill and cost, so that the production volume at the production factory is limited to a very small amount, and about 10% or less. It is a fact that defective products generated at a defective rate cannot be avoided.

Accordingly, the present invention has been made in view of the above-mentioned various circumstances, and is inexpensive and can be manufactured at a lower cost than a conventional adhesive fixing type using a plastic holder, a caulking type using a metal holder, and the like. It is an object of the present invention to provide a pen core holding structure for a writing instrument that can promote improvement in operability.

[0007]

In order to solve the above-mentioned problems, according to the present invention, there is provided a synthetic resin made of a synthetic resin having a shaft hole 2 provided at an end of a shaft cylinder so as to hold an extra fine pen core 11. In the pen holder holding structure for a writing instrument provided with the holder member 1, a plurality of projections 4 are formed so as to project in a state where elasticity is given to an inner diameter portion of the shaft hole 2 of the holder member 1 so as to resist writing pressure. A small-diameter portion 12 for introducing the projection 4 formed by grinding the outer portion of the extra fine pen core 11 by step polishing in a manner corresponding to the position of the projection 4 of the holder member 1. It is. The protruding portion 4 is formed by being arranged in a pleated annular shape along the inner periphery of the shaft hole 2, or formed so as to be slightly inclined in the insertion direction of the ultrafine pen core 11, or formed in the shaft hole 2. The length along the inner circumferential direction can be set to be greater than the width along the inner circumferential direction, or the holder member 1 can be formed as a pleated annular shape that extends straight in the inner diameter direction of the shaft hole 2 of the holder member 1. .

In the pen holder holding structure for a writing instrument according to the present invention configured as described above, when the ultrafine pen lead 11 is inserted into the shaft hole 2 from the rear side of the holder member 1, the holder member 1 By introducing the protruding portion 4 into the small diameter portion 12 of the ultrafine pen core 11, the ultrafine pen core 11
Hold and fix it so that it does not return to the rear side. At this time, by making the projections 4 themselves resilient, when the microfine pen core 11 is mounted in the shaft hole 2 of the holder member 1, the microfine pen core 11 itself does not have any resistance. 2 are inserted. The projections 4 formed in a pleated annular shape along the inner periphery of the shaft hole 2 ensure that the microfine pen core 11 is centered in the shaft hole 2 with respect to the holder member 1. The protruding portion 4 is formed so as to be slightly inclined in the insertion direction of the microfine pen core 11 and formed so as to protrude from the writing pressure applied to the microfine pen core 11 and to hold the holder member 1 with respect to the microfine pen core 11. To strengthen. The protrusion 4 whose length along the shaft hole 2 is set to be larger than the width along the inner circumferential direction opposes a writing pressure of, for example, about 1.5 g or more on the microfine pen core 11. The projection 4 formed as a fold-shaped annular shape extending straight in the inner diameter direction of the shaft hole 2 is used when the microfine pen core 11 is inserted into the shaft hole 2 from the rear side of the holder member 1. The pressure load at the time of insertion into the core 11 is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
For example, oil-based or water-based ink is used as the writing ink, and a writing instrument such as a felt-tip pen (not shown) is provided in which both ends of a synthetic resin barrel are provided with pen cores for bold and fine characters. The shaft hole 2 provided at one end of the shaft cylinder on the side where the fine character pen core is attached is provided to hold an ultrafine pen core 11 made of synthetic resin such as felt material and having a core diameter of about 0.8 mmφ. It is a holder member made of synthetic resin such as plastic.

As shown in FIG. 1, when the holder 1 is inserted into the distal end of the barrel, the outer peripheral portion of the holder 1 is locked to the distal end of the barrel. Is formed in a protruding manner. A plurality of projections 4 are formed continuously or intermittently in a pleated annular shape along the inner circumference of the shaft hole 2 at the inner diameter of the shaft hole 2 of the holder member 1. 4 itself is formed to protrude toward the distal end of the holder member 1, that is, in a state of being slightly inclined in the insertion direction of the ultrafine pen core 11.

On the other hand, the extra-fine pen core 11 is formed with a small-diameter portion 12 by step polishing the outer portion of the extra-fine pen core 11 itself so as to face the protrusion 4 of the holder member 1. When the ultrafine pen core 11 is inserted into the shaft hole 2 from the rear side of 1, the projection 4 is engaged so as to be introduced into the small diameter portion 12, so that the ultrafine pen core 11 is It is held and fixed in a state where it does not return (see FIG. 1B).

The protruding portion 4 is used for writing the fine pen core 1
The shape 1 is set so as not to be pulled out rearward from the shaft hole 2 of the holder member 1. That is, in order to resist writing pressure of, for example, about 1.5 g applied to the microfine pen core 11, the microfine pen core 11 is formed so as to be slightly inclined in the insertion direction of the microfine pen core 11, and furthermore, the shaft hole 2 When the microfine pen core 11 is attached to the inside of the shaft hole 2, the microfine pen core 11 itself is formed in a state where elasticity is imparted so that the microfine pen core 11 itself can be inserted into the shaft hole 2 without resistance. The length L1 along the width, the width W along the inner circumferential direction, and the protruding length D in the inner diameter direction are appropriately adjusted and set (see FIGS. 1B and 1C). ).

A plurality of linear air vents are formed in the inner diameter of the holder member 1 so as to form air vent holes between the projecting side of the microfine pen core 11 and an ink storage chamber (not shown) in the barrel. The replacement groove is formed along the axial direction.

Incidentally, the holder member 1 according to the present embodiment.
Is used for a writing instrument such as a felt-tip pen using, for example, oil-based or water-based ink as the writing ink. In addition to this, the holder member 1 is made of a so-called extra-fine fluorescent pen using a fluorescent pigment as the writing ink. Of course, it may be applied to hold the pen core.

Next, an example of assembling of the embodiment configured as described above will be described. As shown in FIG. 1A, an ultrafine pen core 11 is inserted into the shaft hole 2 from the rear side of the holder member 1. At this time, the projection 4 of the holder member 1
Is introduced into the small-diameter portion 12 of the ultrafine pen core 11, and the ultrafine pen core 11 itself is positioned rearward from the axial hole 2 while ensuring centering of the ultrafine pen core 11 with respect to the holder member 1 in the shaft hole 2. And is firmly held and fixed. The holder member 1 has a flange portion 3 of the holder member 1 at the front end edge of the shaft cylinder of the writing instrument.
Is inserted into the end portion of the barrel so as to be locked.

FIG. 2 shows a second embodiment, and the same components as those in FIG. 1 showing the first embodiment are denoted by the same reference numerals, so that the details are described. Detailed description is omitted. In the second embodiment, the protrusion 4 of the holder member 1 in the first embodiment is used.
Is set so that the length L2 along the shaft hole 2 is larger than the length L1 in the first embodiment described above (FIG. 2).
(See (b).) In order to cope with this, the length D along the axial direction of the small diameter portion 12 of the ultrafine pen core 11 itself is also set large. As a result, the projection 4 itself sufficiently opposes a writing pressure of about 1.5 g or more on the microfine pen core 11.

FIG. 3 shows a third embodiment, and the same components as those in FIG. 1 showing the first embodiment are denoted by the same reference numerals, and are therefore described in detail. Detailed description is omitted. In the third embodiment, the protrusion 4 in the first embodiment is different from the holder 1 in the first embodiment.
Is formed in a pleated annular shape extending straight in the inner diameter direction of the shaft hole 2. When the ultrafine pen core 11 is incorporated into the shaft hole 2 from the rear side of the holder member 1, a pressure load during insertion into the ultrafine pen core 11 itself is minimized.

When the ultrafine pen core 11 is inserted into the holder member 1, the projections 4 swing back and forth, and in some cases, in the circumferential direction of the holder member 1, whereby the ultrafine pen core 11 itself is slightly forcibly forced. May be inserted, or the ultrafine pen core 11 itself may be temporarily or forcibly reduced in diameter so as to be inserted. In essence, an extra-fine pen core 1 in the holder 1
It is sufficient that the projection 4 and the small-diameter portion 12 mesh with each other after the forcible insertion of the pen 1, and the ultrafine pen core 11 is supported in the holder member 1.

[0019]

Since the present invention is constructed as described above, the pen core holding structure can be manufactured at a lower cost as compared with a conventional adhesive fixing type using a plastic holder or a caulking type using a metal holder. In addition, productivity can be greatly improved.

That is, according to the present invention, a plurality of projections 4 are formed in a state in which the inner diameter of the shaft hole 2 of the holder member 1 made of the constituent resin is provided with elasticity so as to resist writing pressure. And a small-diameter portion 12 for introducing the projection 4 formed by grinding the outer portion of the extra fine pen core 11 by step polishing to correspond to the position of the projection 4 of the holder member 1. Conventionally, it has become possible to change from a metal holder type which requires plating to a resin-made holder which is inexpensive and can be mass-produced, such as plastic, which does not require plating. In addition, there is no longer any need for an extrude, dirt, and hardening time due to the adhesive as in the case of the conventional adhesive fixing type using a plastic holder. Furthermore, the skill and cost required in the case of the crimping type using the conventional metal holder are not required, and only the work of the inside job can be completed. Moreover, the use of a plastic holder in addition to the metal holder does not require the conventional complicated installation work of forming an air vent hole, and the air vent hole can be easily formed even with one holder member 1. Made it possible.

Since the projections 4 are arranged in a pleated annular shape along the inner periphery of the shaft hole 2, the center of the microfine pen core 11 with respect to the holder member 1 in the shaft hole 2 is ensured. It is possible to prevent breakage due to the eccentricity of the ultrafine pen core 11 in the shaft hole 2 beforehand.

Since the projections 4 are formed so as to be slightly inclined in the insertion direction of the microfine pen core 11, they can sufficiently oppose the writing pressure applied to the microfine pen core 11, and The function of holding the holder member 1 with respect to the ultrafine pen core 11 can be strengthened.

Since the length of the projection 4 along the shaft hole 2 is set to be greater than the width along the inner circumferential direction, the projection 4 weighs about 1.5 g or more on the extra fine pen core 11 at the time of writing. It can sufficiently withstand writing pressure.

Since the projection 4 is formed as a fold-shaped annular shape extending straight in the inner diameter direction of the shaft hole 2 of the holder member 1, a very fine pen is inserted into the shaft hole 2 from the rear side of the holder member 1. When assembling the core 11, it is possible to reduce a pressure load when the core 11 is inserted into the microfine pen core 11.

[Brief description of the drawings]

FIGS. 1A and 1B are schematic cross-sectional views of a first embodiment of the present invention, in which FIG. 1A shows a state immediately before an ultrafine pen core is inserted into a shaft hole of a holder member, and FIG. The state inserted into the shaft hole of the holder member is shown, and (c) shows the XX cross section in (b).

FIGS. 2A and 2B are schematic cross-sectional views according to a second embodiment of the present invention, wherein FIG. 2A shows a state immediately before an ultrafine pen core is inserted into a shaft hole of a holder member, and FIG. The state where it was inserted in the shaft hole of the holder member is shown.

3A and 3B are schematic cross-sectional views according to a third embodiment of the present invention, wherein FIG. 3A shows a state of a protrusion in a shaft hole of a holder member, and FIG. Show the part.

FIG. 4 is a cross-sectional view showing a conventional technique, in which (a) shows an adhesive fixing type using a plastic holder,
(B) shows a crimping type using a metal holder.

[Explanation of symbols]

 L1, L2: length of the projection W: width D: projection length 1: holder member 2: shaft hole 3: flange portion 4: projection 11: extra fine pen core 12: small diameter portion 100: holder member 101: shaft Hole 102: Extra fine pen core 103: Adhesive 200: Holder member 201: Shaft hole 202: Extra fine pen core 203: Tube head

Claims (5)

[Claims] In a pen core holding structure for a writing implement having a synthetic resin holder member having a shaft hole provided at an end of a shaft cylinder so as to hold an ultrafine pen core, the pen member has a shaft hole inner diameter portion. Grinding by step-grinding the multiple protrusions formed to project repellency in a state where resilience has been imparted to resist writing pressure and the extra fine pen core corresponding to the position of the protrusion on the holder member A pen core holding structure for a writing instrument, comprising: a formed small-diameter portion for introducing a projection. 2. The pen core holding structure for a writing implement according to claim 1, wherein the projections are formed in a pleated annular shape along the inner periphery of the shaft hole. 3. The projection according to claim 1, wherein the projection is formed so as to be slightly inclined in the insertion direction of the ultrafine pen core.
A pen core holding structure for a writing instrument as described in the above. 4. The projection according to claim 1, wherein the length along the shaft hole is set to be larger than the width along the inner circumferential direction.
The pen core holding structure for a writing instrument according to any one of the above. 5. The pen core holding structure for a writing instrument according to claim 1, wherein the projection is formed as a fold-shaped ring extending straight in the inner diameter direction of the shaft hole of the holder member.