JPH09202086A - Ball point pen chip for high viscosity liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball point pen chip for a high viscosity liquid, which is excellent in a constant clearance in a condition, in which the pressure a writen put on the pen is applied, airtightness in a condition, in which the pressure is released, and in a manner of manufacturing. SOLUTION: This chip is constructed such that a ball 8 is held by a housing portion 2, which has a liquid passing port 3 at a bottom 2a, and is prevented by a rim 5 from dismounting. In this case, the chip body 1 comprises a housing portion 2, a plurality of movable portions 6 for biasing the ball 8 against the rim 5 when the pressure a writen put on the pen is released, said movable portions being elastically deflectable in a direction of application of the pressure when the pressure is applied, and a plurality of stationary bearing seats 7 for bearing the ball 8 pushed by the pressure. The chip body 1 is injection molded into a unitary body from a synthetic resin material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball-point pen tip for a high-viscosity liquid, which is suitable for a correction liquid or a liquid paste having a relatively high liquid viscosity.

[0002]

2. Description of the Related Art As a conventional ballpoint pen tip, for example, the ballpoint pen tip described in Japanese Utility Model Publication No. 60-34478 and the structure of the ballpoint pen tip described in Japanese Utility Model Publication No. 60-69684 There is a valve-applied applicator for correction fluid described in JP-A 7-28943, an applicator described in Japanese Utility Model Laid-Open No. 6-17983, and a ballpoint pen described in JP-A-7-251591.

The ball-point pen tip of (3) has minute recessed grooves radially formed on the ball receiving surface, and the target liquid is a low-viscosity liquid having a relatively low liquid viscosity such as water-based ink or oil-based ink. is there. The structure of the ballpoint pen tip is
Protrusions are formed on the ball receiving seat surface separated by the ink groove, and the target liquid is for low viscosity liquid such as water-based ink or oil-based ink whose viscosity is relatively low, similar to the above. It is a thing. That is, and are configured to receive and support the ball at a fixed point in order to secure a certain clearance for drawing the ink between the ball and the rim. By the way, if the viscosity of the liquid is high like correction liquid or liquid glue, the high viscosity liquid will dry and solidify through the gap between the ball and the rim. Can not.

There is an applicator that is compatible with this high-viscosity liquid. The applicator comprises a mouthpiece, a ball holding pipe, a ball, a pressing member, and a spring. The spring is a valve mechanism that pushes the ball through the pressing member. When the writing pressure is released, the valve mechanism is used. Keeps the airtightness of the high viscosity liquid and prevents the high viscosity liquid from drying and solidifying. However, since the ball is supported at the movable point, it can be retracted up to the rim at the end of the holding pipe when the writing pressure is applied, and the clearance between the ball and the rim is not constant. In addition, there is a problem that the discharge amount of the high-viscosity liquid varies, and there is also a problem that the holding pipe end scratches the writing surface when the ball is fully immersed.
Furthermore, the number of parts and the number of parts are large, and the difficulty of assembly is high, and the number of manufacturing steps is large and the manufacturing burden is large.

The applicator comprises a mouthpiece, a ball holding pipe, a ball and a seat member. The spring member of the seat member in the holding pipe is a valve mechanism for pushing the ball, and the writing pressure is released. In this state, the valve mechanism works to maintain airtightness so that the high-viscosity liquid does not dry and solidify. However, the ball seat is constructed so that it can be repelled and moved by a spring piece, and like the above structure, the ball is supported at the movable point, so when the writing pressure is applied, the ball Can immerse up to the rim at the end of the holding pipe at the maximum, the clearance between the ball and the rim is not constant, and the discharge amount of the high-viscosity liquid varies. There is also a problem that will scratch. Further, the number of parts and the number of parts are large, and if the applicator is of a general size, the diameter of the seat member having the spring piece is a minimum of about 1 mm. A high-precision assembly process is required for positioning and fixing in the holding pipe, and the difficulty of assembly is high, and the number of processes and the manufacturing burden are large.

On the other hand, the ball-point pen is composed of three members, a ball holding pipe, a ball and a spring, and has a valve mechanism that pushes the ball, which is caulked and held by the housing at the tip of the metal holding pipe, with a spring, and the writing pressure is In the loaded state, the ball is supported by the seat of the housing, a certain clearance is secured between the ball and the rim, and in the state where the writing pressure is released, the valve mechanism works to maintain airtightness. , The high viscosity liquid is prevented from drying and solidifying. Although such a ballpoint pen solves both problems of clearance and airtightness, since the spring is housed in the ball holding portion and the ball is pressed by the rod shaft portion of the spring tip, A high precision molding process is required so that the movement of the rod shaft is not obstructed by the seat, and there remains a problem in that the manufacturing and assembling of each component part imposes a heavy manufacturing burden.

[0007]

The problems to be solved are, firstly, a certain clearance in the state where the writing pressure is applied, an airtightness in the state where the writing pressure is released, and a manufacturability. A ball-point pen tip for high-viscosity liquid that is excellent in all, secondly, a ball-point pen tip for high-viscosity liquid that does not have liquid clogging in the liquid passage port, and third, liquid clogging in the liquid passage portion that reaches the liquid passage port. The purpose of the present invention is to provide ballpoint pen tips for high-viscosity liquids, respectively.

[0008]

In order to achieve the above-mentioned object, the present invention has a ball-point pen tip for a high-viscosity liquid in which a ball is held by a housing portion having a liquid passage opening at the bottom and held by a rim. In the tip body, the housing portion, and a plurality of movable portions that elastically press the ball against the rim when the writing pressure is released, and are elastically bendable in the same loading direction when writing pressure is applied, It is characterized in that it is composed of a plurality of fixed receiving seat portions that receive and support the ball pushed by the writing pressure, and that the chip body is injection-molded in the same body with a synthetic resin material. Further, the invention is characterized in that the movable portion is located in the middle between the fixed receiving seat portions. Further, the present invention is characterized in that the movable portion has a stirring portion extending to a liquid passage side reaching the liquid passage port. The synthetic resin material in the present invention is an engineering plastic such as polyacetal or a known synthetic resin material.

[0009]

1 and 2 show an embodiment of a ballpoint pen tip for high viscosity liquid of the present invention, in which a tip body 1 is injection-molded into a single body of polyacetal resin, The housing portion 2 of the chip body 1 has a liquid passage port 3 formed in the bottom portion 2a so that the housing portion 2 and the lower liquid passage 4 are communicated with each other, and a ball 8 is attached to the housing portion 2 to prevent the housing portion 2 from being pulled out by the rim 5. And holds it rotatably. Then, the bottom portion 2a of the housing portion 2
When the writing pressure is released, the ball 8 is elastically pressed against the rim 5, and when the writing pressure is applied, the plurality of movable ribs 6 that can be elastically bent in the same loading direction and the ball 8 pushed by the writing pressure are It is formed by a plurality of fixed receiving seat ribs 7 that receive and support.

The movable rib 6 extends from the inner surface of the housing portion 2 toward the center in the centripetal direction and has a protrusion 6a on the upper surface of the tip.
Are formed so as to contact the lower surface of the ball 8. The movable rib 6 is located in the middle between the fixed receiving seat ribs 7 and elastically bends to force the high viscosity liquid in the liquid passage port 3 between the fixed receiving seat ribs 7 to flow. To prevent liquid clogging. The fixed receiving rib 7 extends from the inner surface of the housing portion 2 in the centripetal direction, and is formed so as to ensure a certain clearance a between the rim 5 and the ball 8 in a state where the ball 8 is supported and supported on the upper surface. I am doing it.

As a result, when the writing pressure is applied,
Since the ball 8 is pushed against the elastic force of the movable rib 6 and is supported by the fixed receiving rib 7, a constant clearance a can be secured between the ball 8 and the rim 5, and the high viscosity liquid The discharge amount of is stable. When the writing pressure is released, the ball 8
Is pressed by the elastic recovery force of the movable rib 6 and comes into contact with the rim 5 in a pressure contact state, so that airtightness can be maintained between the ball 8 which is the liquid outlet and the rim 5, and the high viscosity liquid is dried.・ Can prevent coagulation in advance. Then, except for the ball 8, the chip body 1, that is, the housing portion 2, the liquid passage port 3, and the liquid passage 4
Since the rim 5, the movable rib 6, and the fixed receiving rib 7 are injection-molded in the same body with a resin material, the chip body can be easily molded and the ball 8 is attached to the housing portion 2 of the chip body 1. It is easy to assemble just by work and has great advantages in terms of manufacturability. The movable rib 6 located in the middle between the fixed receiving seat ribs 7 repeatedly elastically bends whenever the writing pressure is applied, and the fixed receiving seat ribs 7
Since the high-viscosity liquid can be forced to flow in the liquid passage port 3 portion between them, liquid clogging does not occur in the liquid passage port 3 and stable supply can be achieved.

3 and 4 show another embodiment of the high-viscosity liquid ball-point pen tip of the present invention. Since the structure is basically the same as that of FIG. 1 described above, it is common. The description of the different configurations will be omitted, and the different configurations will be described. The movable ribs 6 in the chip body 1 are connected to respective tip portions extending in the middle of the fixed receiving seat ribs 7, and a rod-shaped projection 6b is formed on the same portion so as to abut the lower surface of the ball 8. At the same time, a stirring portion 6c is formed below the protrusion 6b so as to extend to the liquid passage 4 side. The projecting portion 6b and the stirring portion 6c are concentric with each other, and are concentric with the housing portion 2 so that the projecting portion 6b abuts the ball 8 from directly below.

As a result, the same effect as that of FIG. 1 described above can be obtained, and the stirring portion 6c located in the portion of the liquid passage 4 leading to the liquid passage port 3 has an axis line every time a writing pressure is applied. It is possible to forcibly stir the high-viscosity liquid in the liquid passage 4 by repeating vertical movement along the direction, so that the liquid passage port 3
Liquid clogging does not occur in the portion of the liquid passage 4 leading to, and the high-viscosity liquid can be smoothly and stably supplied from the liquid passage 4 to the liquid passage port 3.

5 and 6 show another embodiment of the high-viscosity liquid ballpoint pen tip of the present invention. Since the structure is basically the same as that of FIG. 1 described above, it is common. The description of the different configurations will be omitted, and the different configurations will be described. The movable rib 6 in the chip body 1 has a protrusion 6a.
It is formed by two movable ribs 6 each having a protrusion 6b and a stirring portion 6c in FIG. As a result, the same effect as that of FIG. 3 described above can be obtained, and since the stirring section 6c moves up and down while swinging, the stirring efficiency of the high viscosity liquid is high.

FIGS. 7 and 8 show another embodiment of the high-viscosity liquid ballpoint pen tip of the present invention. Since the structure is basically the same as that of FIG. The description of the different configurations will be omitted, and the different configurations will be described. The movable rib 6 in the chip body 1 has a protrusion 6a.
In addition to the three movable ribs 6 having the protrusions 6b and the stirring portion 6c in FIG.
The movable rib 6 having the above is extended and formed. This has the same effect as that of FIG. 5 described above.

[0016]

A. Effects of the Invention According to the first aspect of the present invention, when the writing pressure is applied, the ball is pushed against the elastic force of the movable portion and is supported by the fixed receiving seat portion. A clearance can be secured and the discharge amount of the high-viscosity liquid becomes stable. In the state where the writing pressure is released, the ball is pushed by the elastic recovery force of the movable part and comes into pressure contact with the rim, so that airtightness can be maintained between the ball and the rim, and high viscosity liquid Can prevent drying and solidification. And, except for the balls, the chip body, that is, the housing portion, the liquid passage opening, the rim, the movable portion, and the fixed receiving seat portion are injection-molded in the same body with a synthetic resin material, so that the chip body can be easily molded and processed. Assembling can be done easily by only attaching the ball to the housing portion of the chip body, which is a great advantage in terms of manufacturability. B. According to claim 2, the movable portion located in the middle between the fixed receiving seat portions elastically repeats the bending operation each time the writing pressure is applied, and the liquid passage opening portion between the fixed receiving seat portions is formed. Since the high-viscosity liquid in 3) can be forced to flow, liquid clogging does not occur at the liquid passage port, and stable supply is possible. C. According to claim 3, the stirring portion located in the liquid passage portion reaching the liquid passage opening is repeatedly moved up and down along the axial direction every time the writing pressure is applied to force the high viscosity liquid in the liquid passage. Since it can be agitated, the liquid passage portion reaching the liquid passage port is not clogged with liquid, and the high-viscosity liquid can be smoothly and stably supplied from the liquid passage to the liquid passage port.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating an embodiment of a ballpoint pen tip for high viscosity liquid of the present invention.

FIG. 2 is a cross-sectional view taken along line (2)-(2) of FIG. 1 where balls are omitted.

FIG. 3 is a vertical cross-sectional view illustrating another embodiment of the high-viscosity liquid ballpoint pen tip of the present invention.

FIG. 4 is a cross-sectional view taken along line (4)-(4) of FIG.

FIG. 5 is a vertical cross-sectional view illustrating another embodiment of the ballpoint pen tip for high viscosity liquid of the present invention.

FIG. 6 is a cross-sectional view taken along line (6)-(6) of FIG.

FIG. 7 is a vertical cross-sectional view illustrating another embodiment of the high-viscosity liquid ballpoint pen tip of the present invention.

8 is a cross-sectional view taken along line (8)-(8) of FIG.

[Explanation of symbols]

 1 chip body 2 housing part 2a bottom part of housing part 3 liquid passage port 4 liquid passage 5 rim 6 movable rib (movable part) 6a, 6b movable rib projection 6c movable rib stirring part 7 fixed receiving seat rib (fixed receiving seat) Part) 8 ball a clearance

Claims (3)

[Claims] 1. A ball-point pen tip for high-viscosity liquid, in which a ball is held by a rim and held by a housing portion having a liquid passage opening at the bottom, the tip body comprising the housing portion and a writing pressure release means. Sometimes, the ball is elastically pressed against the rim to flexibly move in the same direction when a writing pressure is applied, and a plurality of fixed parts that support the ball pressed by the writing pressure. A ball-point pen tip for high-viscosity liquid, characterized in that the tip main body is injection-molded into a single body from a synthetic resin material. 2. The ballpoint pen tip for high viscosity liquid according to claim 1, wherein the movable portion is located in the middle between the fixed receiving seat portions. 3. The ballpoint pen tip for a high viscosity liquid according to claim 1, wherein the movable portion has a stirring portion extending to a liquid passage side reaching the liquid passage opening.