JPH022629Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a water-based ballpoint pen.

In a water-based ballpoint pen, in order to smoothly replenish ink from the ink absorber to the first ink guide core that holds the ball, the end surface of the tip of the second ink guide core whose rear end is embedded in the ink absorber is 1st
A structure in which the ink guiding core is in contact with the end surface of the rear end has been proposed, but the first ink guiding core and the second ink guiding core
In the case where the ink guide core is structured such that the end faces abut each other, there may already be a gap between the end faces in the assembled state, or a gap may be created due to dropping or vibration during use. 2
Replenishment of ink from the ink guiding wick to the first ink guiding wick becomes uncertain. In addition, since the diameter of the first ink guide core is normally a small diameter of about 0.38φ, in a water-based ballpoint pen whose end surfaces simply touch each other,
During assembly, excessive force is applied to the rear end of the first ink guide core, causing the first ink guide core to bend.
There was a fear that it might break.

The purpose of the present invention is to provide a water-based ballpoint pen that does not have such drawbacks, and its gist is that the first ink guide core, which holds the ball at the tip, is connected to the second ink guide core that is in contact with it. In a water-based ballpoint pen configured to receive ink supply from an ink storage body through an ink guide core, a recess is provided at the tip of the second ink guide core, and a rear end of the first ink guide core is inserted into the recess. embedding or providing a soft part at the center of the tip of the second ink guide core;
The water-based ballpoint pen is characterized in that the rear end portion of the first ink guide core is inserted and embedded in the soft portion.

The present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a cross-sectional view showing the details of the ink guiding core of the water-based ballpoint pen of the present invention, in which 1 is the writing barrel, 2 is the ink storage body housed in the writing barrel 1, and 3 is the tip of the writing barrel 1. It is a writing tip that is fitted. The writing tip 3 rotatably holds a ball 6 at its tip, and also holds a pipe 4 containing a first ink guiding core 5 for supplying ink to the ball. The writing tip 3 has a cavity 7 at its rear end, into which the tip of the second ink guiding core 8 is fitted.
According to the present invention, a recess 8a is provided at the tip of the second ink guiding core 8.
The rear end portion 5a of the first ink guide core 5 is fitted therein, and this rear end portion is thus embedded in the tip portion of the second ink guide core 8. On the other hand, the second
The rear end portion of the ink guiding core 8 is fitted into the ink storage body 2.

Preferably, when inserting the rear end portion 5a of the first ink guide core 5 into the recess 8a, care is taken to create a slight gap 8c, so that no undue force is applied to the first ink guide core 5. There is no risk of joining.

Figure 2 is a sectional view taken along line A-A in Figure 1.
An enlarged cross section of the ink guiding core 5 is shown. That is, the first
The ink guide core 5 is built into the pipe 4,
It is provided with radial ink guide grooves 5b.

In another embodiment of the present invention, when producing the second ink guide core from acrylic fibers by adhesive curing, the degree of adhesive curing is determined such that the outer peripheral part is hard and the inner core part is softer. The rear end portion of the first ink guide core may be embedded in the core portion. In this case, the second
There is no need to take the trouble to provide a recess at the tip of the ink guide core.

Since the present invention has the above structure, there is no risk of bending or breaking the first ink guiding core due to excessive force being applied to it during assembly, and even if the first ink guiding core is dropped or subjected to vibration during use, There is no gap between the first ink guide core and the second ink guide core, and the practical effect is that the ink can be smoothly replenished to the ball at all times.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1: Writing barrel, 2: Ink storage body, 3: Writing tip, 4: Pipe, 5: First ink guiding core, 6:
Ball, 7: Hole, 8: Second ink guiding core.

Claims (1)

[Scope of utility model registration request] In a water-based ballpoint pen configured to receive ink from an ink storage body through a second ink guiding core in contact with a first ink guiding core that holds a ball at its tip, the second ink guiding core Either a recess is provided at the tip of the second ink guiding wick into which the rear end of the first ink guiding wick is inserted and embedded, or a soft part is provided at the center of the tip of the second ink guiding wick and the first ink guiding wick is inserted into the soft part. A water-based ballpoint pen characterized by having the rear end of the lead inserted and embedded.