KR100360613B1 - Ballpoint Tip for Liquid Vessel - Google Patents

Abstract

The tip of the conventional ball-type liquid container was invented in view of the fact that it was very difficult to automate due to the large number of parts and the entanglement of the spring. The tip of the holder 2 was wrapped to allow the application ball 3 to rotate. In the tip tip 1 of the ball-type liquid container held in the form, a spring 4 which is bent by writing pressure when a letter is pressed in the holder 2 is installed. The front end extends and press-contacts the ball 3 through the liquid induction hole 2g in the tip end of the holder 2, and the rear part of the spring 4 is formed into a large diameter portion, so that the locking portion 4b On the other hand, the rear end of the holder 2 is narrowed to form a rear end fixing portion (2j).

Description

Ballpoint Tip for Liquid Vessel

The present invention relates to a tip of a ball-type liquid container having a ball as a writing medium, such as a ballpoint pen writing member.

Most of the factors that determine the performance of ball-type liquid containers used in writing instruments such as ballpoint pens depend on the precision of the tip tip. Even if you draw a line only 10 cm, the ball rotates at 44.5 revolutions of a 0.7 mm diameter ball and up to 63.7 revolutions of a 0.5 mm diameter ball. do. Thus, how to prevent frictional wear, which inevitably arises from such a quick turn, or corrosion and deterioration caused by a quick turn, and how to maintain its performance, is a serious problem for this type of tip. It is becoming. And, if there is a problem in the structure of the tip tip there is a risk that the ink leaks or a lot of ink dung occurs while writing with a writing instrument such as a ballpoint pen.

However, as the tip of the tip used in a ball-type liquid container such as a conventional pen core member of this kind, there may be mentioned, for example, those described in Japanese Utility Model Application Laid-open No. Hei 5-76568. That is, the coating liquid tank 14 rich in flexibility is connected to the front end tip 12 which hold | maintained the ball 11 in FIG. 7 via the connection member 13 and the press-fit cylinder 17. In the applicator in which the coating liquid tank 14 is filled with a film-forming coating liquid having a high viscosity, the ball is rotated while the ball is exposed inside the front end of the tip 12. The ball 11 is pushed forward at the front end surface of the mover 15 which is held in the tip tip 12 and has a low mass mover disposed therein and is shot by a spring 16. It is struck to contact the leading edge toward the inside of the tip 12.

However, the conventional technique used in the control of liquids, such as ball pens and correction liquids, which use gel ink, is used because the ball press part is made of resin and the coil spring is used together, so the number of parts is large. If the pitch of the coil spring exceeds twice the diameter of the spring, that is, the thickness of the steel wire, the springs are entangled easily and cannot be assembled using an automatic assembly machine, and thus cannot cope with mass production.

Accordingly, the present invention has been invented to solve the drawbacks of the prior art as described above, the ball pressing portion and the coil spring is integrally formed so that the tip of the structure is unitized, and when the spring is free, As the gap between each coil is narrower than the spring diameter, the springs are not entangled with each other, and the catching part, which is the rear end of the spring that is tightened and mounted in the tip tip of the ballpoint pen, is larger than the outer diameter of the pitch part. The object is to provide a tip of a ball-type liquid container that can be assembled into an automatic assembly, so that it can be shaped like a run.

In addition, in the ball-type liquid container of the knock type or the lid rotation type which uses ink of the low viscosity to the high viscosity (3.5 cps-5,000 cps at 20 degreeC) for the purpose of writing, a spring is inserted in the tip tip of a ballpoint pen. It is installed at the back of the ball, while it is tightened and mounted by the back end of the holder, and the spring is pushed forward and the opening of the front end is completely blocked, so that ink leaks from the front end when carrying without writing. In addition to being prevented, it is an object of the present invention to provide a tip of a ball-type liquid container which can prevent the ink from drying on the ball rolling portion.

1 is a longitudinal cross-sectional view showing the tip of the ball-type liquid container according to an embodiment of the present invention,

FIG. 2 is an enlarged longitudinal sectional view showing the tip portion of the tip tip in the state where the spring of the tip tip shown in FIG. 1 is extracted; FIG.

3 is a cross-sectional view taken along line A-A of FIG.

Figure 4 is a bottom view showing a state without the ball of FIG.

5 is a longitudinal sectional view showing a state where the tip tip is attached to the pen core member for ballpoint pen,

6 is a longitudinal sectional view showing a ballpoint pen assembled with a ballpoint pen core member in an outer cylinder;

7 is a longitudinal sectional view showing the tip of a conventional ball-type liquid application tool.

1----tip tip, 2----holder,

2a----front part of the pen, 2b----thin wall,

2c----step, 2d----first step,

2e----2nd step, 2f----3rd step,

2g----ink guide hole, 2gg----branch hole,

2h----ball rest, 2i----

2j----trailing fasteners, 3----balls,

4----coil spring, 4a----extension,

4b----latching part, 5----lead member,

6----back stopper, 7----backflow prevention member,

8----outer cylinder, 9----return spring,

10----clips, 11----knocks.

The tip tip of the ball-type liquid container according to the present invention for achieving the above object, in the tip tip of the ball-type liquid container enclosed and held so as to rotate the ball at the tip of the holder, the writing pressure in the mall holder In addition to the built-in bending spring, the extension of the front end of the spring is pressed against the ball through the liquid guide hole in the tip of the holder, and has a structure in which a tightening part for tightening the rear end of the holder is formed.

(Example)

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a longitudinal cross-sectional view of the tip of the ball-type liquid container of the present invention, in which the tip 1 is composed of a number of components such as the holder (2) and the ball (3) and the coil spring (4).

In more detail, the holder 2 constituting the tip tip 1 has a pen tip 2a at the front end of the cylindrical body, and has a stepped portion 2c between the thin wall portion 2b as the rear part thereof. ) Is formed. Further, inside the pen tip 2a, a first stepped portion 2d, a second stepped portion 2e, and a third stepped portion 2f are formed so that the inner diameter thereof becomes smaller step by step toward the front. Then, the ink guide hole 2g is formed in the third step portion 2f toward the front end opening.

FIG. 2 is an enlarged longitudinal sectional view of the tip tip portion of FIG. 1, and as can be seen from the drawing, the tip tip 1 is formed in, for example, a material in the tip of the pen tip 2a at the front end of the holder 2. The superhard ball 3 made of 96% of Tungsten Carbide and 4% of Cobalt is enclosed and held so as to be rotatable by the front end tightening portion 2i.

3 and 4, the ink induction hole 2g is formed in the front end of the holder 2, and the ball support portion is formed in the front inner circumference of the ink induction hole 2g. 2h) is formed, and the ball support portion 2h has a gap partially formed between the balls 3 so that the balls 3 can be rotated and held.

In this holder 2, a coil spring 4 constituting the tip 1 as shown in the drawing is inserted and loaded from the rear side. That is, the front end of the coil spring 4 has a straight extension 4a extending forward along the axis of the hold 2, so that the extension 4a passes through the ink induction hole 2g and the ball 3 ), The front end surface of the extension portion 4a touches the ball 3 and pushes the ball 3 forward to expose a portion of the ball 3 at the front end opening of the holder 2. In this case, it is most suitable for the ball 3 to expose about 35% to 40% of its diameter.

On the other hand, at the rear end of the coil spring 4, a locking portion 4b having a large diameter is formed, and the rear end of the locking portion 4b is hooked by the rear end tightening portion 2j of the holder 2 to be accommodated. It is supposed to be. On the other hand, a gap is partially formed between the ball 3 and the holder 2, but the front end tightening portion 2i is formed at the tip of the holder 2, so that the ball 3 is held by the holder 2; Can't get out of

3 and 4, the ink guide hole 2g has a plurality of radially radiated from the center hole in cross section so that ink can flow smoothly in relation to the ball 3. Branch holes 2gg are formed respectively.

On the other hand, strictly speaking, the front end surface of the extension portion 4a of the coil spring 4 is planar, whereas the ball 3 has a spherical surface, and both of them are in point contact state. In this state, the ball 3 is pushed forward in the fore tightening portion 2i to be brought into close contact with the entire inner circumference of the fore tightening portion 2i, as described later. Even if it is carried in the state attached to the core member, there is an advantage that there is no fear of ink leakage.

Further, the rear end of the coil spring 4 is formed by a locking portion 4b having a larger diameter than the intermediate pitch portion, and the rear end of the holder 2 corresponding to the locking portion 4b has a rear end tightening portion ( 2j), the rear end of the coil spring 4 is caught by the rear end fastening part 2. In addition, since the outer diameter of the locking portion 4b has a large diameter, even if the tightening degree of the rear end tightening portion 2j of the holder 2 is low, there is also an advantage that the locking action of the coil spring 4 can be sufficiently exhibited. .

However, it is important to make the gap between each coil constituting the spring narrower than the linear diameter of the spring when the spring is free. Specifically, the coil spring 4 has a linear diameter in the range of 0.1 mm to 0.2 mm, and the pitch when the spring is free is 1.5 times to 1.9 times the linear diameter of the coil spring 4. The coil spring 4 is mounted so as to be pitched so as to be tightened behind the ball 3 in the tip tip 1. In addition, if the diameter of the rear end engaging portion 4b of the coil spring 4 that is caught by the rear end tightening portion 2j is larger than the outer diameter of the pitch portion that is the middle portion of the coil spring 4, the direction processing is automatically enabled. There is also an advantage.

FIG. 5 is a longitudinal sectional view showing a state in which the tip tip 1 configured as described above is attached to a ballpoint pen core member, in which reference reference No. 5 shows a ballpoint pen member filled with a ballpoint pen ink. At the front end of the small diameter portion 5a, which is the front part of the member 5, the tip tip 1 is provided to be fixed by pressing.

On the other hand, an opening is formed in the rear portion of the core member 5, and a rear end cap 6 having an air hole small hole 6a is attached to the opening. In addition, in contact with the rear end surface of the ink filled in the core member 5, a backflow preventing member 7 made of polybutene or the like for preventing backflow of the ink is provided. The backflow preventing member 7 moves as the ink is consumed, and descends together with the ink to prevent the ink from flowing back.

FIG. 6 is a longitudinal sectional view showing a knock-type ballpoint pen in which the ballpoint pen member 5 is assembled to the outer cylinder 8 again, and the locking portion 8a is formed at the inner circumference of the front portion of the outer cylinder 8; The return spring 9 mounted between the locking jaw 5b of the pen core member 5 is pushed to the rear of the outer cylinder 8.

Here, when the knock portion 11 is knocked during use, the core member 5 moves forward against the resilience force of the return spring 9 so that the front end of the tip tip 1 protrudes from the opening of the outer cylinder 8. In this state, the locking projection 10a formed on the rear of the front end portion of the clip 10 is held by the stopper 8b provided on the outer wall of the outer cylinder 8, thereby making it possible to write.

On the other hand, after writing is finished, press the rear end of the clip 10 or pull up the front end of the clip 10 so that the locking projection 10a is peeled off from the stopper 8b of the outer cylinder 8, the core member 5. Is pushed back by the return spring 9 to return to its original position so that the front end of the tip 1 enters into the outer cylinder 8 to be received.

That is, in the tip tip 1 of the ball-type liquid container configured as described above, the ball 3 is enclosed by the front end tightening portion 2i in which the ball 3 is inserted into the inside of the front end in advance and the periphery of the front end is narrowed. It is wrapped and held. A plurality of tip tips 1 are set so as to stand on the turntable, and the coil spring 40, which is suspended downward with the locking portion 4b upward, is positioned in accordance with the rotation of the turntable so as to be placed in the holder 2. After being set, if the rear end of the holder 2 is tightened, the united tip tip 1 can be easily completed by automation.

Since the present invention is constituted as described above, the tip of the spring can be unitized by integrating the ball pressing portion and the coil spring, and the gap between the coils forming the spring when the spring is in the free state is applied to the wire of the spring. By making the spring narrower than the diameter, the springs are not entangled. If the catching part of the rear end of the spring that is tightened and mounted in the tip of the ballpoint pen is larger than the outer diameter of the middle pitch part, the alignment direction of the spring can become a fishing hook shape. There is an effect that can be assembled.

In addition, the present invention is a ball of the ball housed in the tip tip of the ballpoint pen in a knock or cap rotary writing instrument using an ink of low to high viscosity (3.5 cps to 5,000 cps at 20 ℃) for writing purposes By tightening on the back, it prevents ink from leaking from the tip when not writing, and also prevents ink from drying out on the surface of the ball.

Claims (4)

In addition to the built-in spring 4 bent by the writing pressure in the holder 2, the extension portion 4a at the front end of the spring 4 is connected to the ball (2g) through the ink guide hole 2g in the tip end of the holder 2; 3) the tip of the ball-type liquid container configured to be pressed against, while the rear end of the holder 2 is narrowed to form a tightening portion 2j, so that the ball 3 is rotatably held at the tip of the holder 2. In the tip, The tip of the ball-type liquid container, characterized in that the outer diameter of the engaging portion (4b) that is the rear end portion is tightened and mounted to the spring (4) is larger than the outer diameter of the pitch portion, which is the intermediate body of the spring (4). delete The tip tip of a ball-type liquid container according to claim 1, wherein an interval between each coil constituting the spring (4) when the spring (4) is in a free state is narrower than a linear diameter of the spring. 4. The linear diameter of the spring 4 is in the range of 0.1 mm to 0.2 mm, and the pitch in the free state of the spring 4 is 1.5 times to 1.9 times the linear diameter of the spring. Tip of the ball-type liquid container characterized in that the.