JPH088868Y2 - Writing instrument with slide stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention also relates to a writing instrument with a slide stopper.

[Prior art and its problems]

In a writing tool that fills ink in a bottomed ink cylinder and transmits the ink to the pen body for writing, a pen core is usually interposed between the ink cylinder and the pen body. The pen core has a function of introducing air into the ink cylinder in an amount equal to the amount of ink consumed for writing, and a function of storing excessively discharged ink and preventing ink dripping. Here, the ink is ejected excessively because the writing instrument is left in a high temperature place, or when the body temperature of the hand of the writer is transmitted and the temperature in the ink cylinder rises, the air in the ink cylinder expands. This is because the pressure inside the ink cylinder becomes large and the ink is pushed out by this, but since the ink storage capacity of the pen core is limited, if the discharge amount exceeds this limit, the ink drops. Therefore, by arranging the slide stopper inside the ink cylinder without using the pen core, and by making the slide stopper move forward as ink is consumed without replacing the ink with air, air will not flow into the ink cylinder. Since it does not exist, it is possible to prevent the ink from flapping off due to an increase in pressure, but further, there are advantages that the number of parts is reduced, the capacity of the ink cylinder is increased, and the writable distance is increased.

However, in such a writing instrument with a slide stopper,
It is necessary to arrange the slide stopper in the ink cylinder in a liquid-tight manner with a large sliding resistance, and on the other hand, it is required to slide easily in the ink cylinder in order to smoothly eject the ink during writing. As described above, the sliding resistance value of the slide plug is important, and it is necessary to set it to an appropriate value, but this is quite difficult. Therefore, a valve plug having a valve function is arranged in the ink cylinder to divide the ink cylinder into a main ink chamber and a sub ink chamber, and ink is supplied from the sub ink chamber to the pen body. When the ink in the ink chamber is consumed and the pressure in the sub-ink chamber drops, the valve of the valve plug opens and ink is supplied from the main ink chamber to this sub-ink chamber, so that the sub-ink chamber is always filled with ink. Is proposed. In addition, even when a large pressure change occurs momentarily due to impact on the ink chamber, such as when the writing instrument is dropped on the floor, the valve stopper damps the ink, preventing ink dripping. .

This valve plug is a columnar body made of an elastic material such as silicon rubber, and has a collar-shaped valve portion that is in contact with the inner peripheral surface of the ink cylinder at the tip thereof. When the part deforms due to the pressure difference and separates from the inner peripheral surface of the ink cylinder, the ink passage from the main ink chamber to the sub ink chamber opens,
The pressure difference between the main ink chamber and the sub ink chamber is small, and the flange valve portion does not deform depending on the viscosity characteristics of the ink used. For this reason, there is a problem that ink is not supplied to the sub ink chamber and ink runs out.

[Purpose of device]

Therefore, an object of the present invention is to provide a writing instrument with a slide stopper, which has a simple structure and in which the valve stopper reliably operates to supply ink to the sub-ink chamber and does not run out of ink.

[Constitution of the device and its action]

According to the configuration of the present invention, a slide stopper that advances as ink is consumed is arranged in the ink cylinder to form an ink chamber,
A valve plug made of a synthetic resin having high elasticity is arranged in the ink chamber to divide the ink chamber into a main ink chamber and a sub ink chamber, and the ink chamber is formed on the outer periphery of the front surface of the valve plug and contacts the inner wall of the ink chamber. In a writing instrument with a slide stopper, in which the flanged valve part is separated from the inner wall of the ink chamber by the pressure difference between the main ink chamber and the sub ink chamber, the pen slides on the tip opening of the ink cylinder. It is freely fitted, and the rear end of the pen comes into contact with the front end face of the valve plug, and when the pen is retracted, the center part of the front end face of the valve plug is greatly depressed and the flange-shaped valve part deforms toward the center. Is separated from the inner wall of the ink chamber, and an ink passage from the main ink chamber to the sub ink chamber is opened.

That is, when the valve plug does not operate due to the viscosity of the ink used, the pen plug is retracted to forcefully deform the valve plug, so the ink passage from the main ink chamber to the sub ink chamber is opened reliably. Sufficient ink is supplied to the sub ink chamber to prevent ink shortage.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

In FIG. 1, an ink cylinder 1 formed of a transparent synthetic resin also serves as a shaft cylinder of a writing instrument, and a tip opening 11 has a
For example, a pen body 2 made of plastic having open cells
Is mounted so that it can slide freely. A tail plug 8 having a vent hole 81 is fitted in the rear end opening of the ink cylinder 1, a slide plug 3 is slidably arranged in the ink cylinder 1, and a water-based ink is provided in front of the slide plug 3. Is filled. A valve plug 4 is arranged in the ink cylinder 1 in the vicinity of the pen body 2, and a rear end of the valve plug 4 has a plurality of protrusions formed on the ink cylinder 1.
It is fixed at 12. The valve plug 4 divides the main ink chamber 6 and the sub-ink chamber 7, and the gap between the outer circumference of the valve plug 4 and the inner surface of the ink cylinder 1 is an ink passage 5 extending from the main ink chamber 6 to the sub-ink chamber 7.

The valve plug 4 is a columnar body made of a highly elastic synthetic resin such as silicon rubber, and the front end surface 4a is slightly recessed in an arc shape in cross section, and a collar-shaped valve portion is provided on the outer periphery of the front end surface 4a. 41 is formed. The rear end of the pen body 2 contacts the central portion of the tip surface 4a, and the collar-shaped valve portion 41 contacts the inner peripheral surface of the ink cylinder 1. The collar-shaped valve portion 41 is provided in the main ink chamber 6
With a slight differential pressure in the sub ink chamber 7, the ink is deformed and separated from the inner peripheral surface of the ink cylinder 1, and the aqueous ink flows from the main ink chamber 6 into the sub ink chamber 7 through the ink passage 5. There is.

Then, when the water-based ink in the sub-ink chamber 7 is consumed by writing, the pressure in the sub-ink chamber 7 decreases and the collar-shaped valve portion 41 deforms. Therefore, the water-based ink in the main ink chamber 6 flows into the sub-ink chamber 7, and the sub-ink chamber 7 is always filled with the water-based ink. On the other hand, this causes the pressure in the main ink chamber 6 to drop, and the slide plug 3 slides forward by the amount of water-based ink consumed.

By the way, depending on the viscosity characteristics of the water-based ink, the collar-shaped valve portion 41 adheres to the inner peripheral surface of the ink cylinder 1, and the sub-ink chamber 7
Even if the water-based ink inside is consumed, the collar-shaped valve portion 41 does not deform,
The water-based ink does not flow into the sub ink chamber 7. At this time, as shown in FIG. 2, the tip of the pen body 2 is pressed against the paper surface or the like with a force larger than normal writing pressure to retract the pen body 2. As a result, the tip end surface 4a of the valve plug 4 has a large depression in the center portion and the peripheral portion is deformed toward the center. Therefore, the collar-shaped valve portion 41 is also deformed toward the center and separated from the inner peripheral surface of the ink cylinder 1, so that the ink passage 5 opens and the aqueous ink in the main ink chamber 6 flows into the sub ink chamber 7. When the flow into the sub ink chamber 7 is completed, the pressing of the pen body 2 is released. As a result, the valve stopper 4 which is rich in elasticity is restored, and the pen body 2 advances and returns to the state shown in FIG. 1, so that writing can be performed without running out of ink.

[Effect of device]

As described above, the writing instrument with a slide stopper of the present invention is configured such that the pen body is slidably fitted in the tip opening of the ink cylinder, and the rear end of the pen body is brought into contact with the front end face of the valve stopper. When the body is retracted, the valve plug is forcibly deformed,
The flange-shaped valve part of the valve plug is separated from the inner wall of the ink chamber to open the ink passage from the main ink chamber to the sub ink chamber, so the valve plug operates reliably with a simple structure. Ink is supplied to the ink to eliminate ink shortage.

[Brief description of drawings]

 1 and 2 are sectional views of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Ink cylinder, 2 ... Pen body, 3 ... Slide stopper, 4 ... Valve stopper, 5 ... Ink passage, 6 ... Main ink chamber, 7 ... Sub ink chamber, 8 ... Tail plug, 11 ... Tip opening, 12 ... Protrusion 41 ... Collar shape Valve part, 81 ... Vent hole

Claims (1)

[Scope of utility model registration request] 1. An ink chamber is formed by arranging a slide stopper, which advances as ink is consumed, in an ink cylinder, and a valve stopper made of a synthetic resin having high elasticity is arranged in the ink chamber. A flange-shaped valve section, which is divided into an ink chamber and a sub-ink chamber, is formed on the outer periphery of the front surface of the valve plug and contacts the inner wall of the ink chamber, is separated from the inner wall of the ink chamber by the pressure difference between the main ink chamber and the sub-ink chamber. In a writing instrument with a slide stopper in which ink is supplied to the sub-ink chamber, a pen body is slidably fitted in the tip opening of the ink cylinder, and the rear end of the pen body is on the front end face of the valve stopper. When abutting and retracting the pen body, the central part of the front end face of the valve plug is greatly depressed and the flanged valve part is deformed toward the center and separated from the inner wall of the ink chamber, and the ink passage from the main ink chamber to the sub ink chamber Is characterized by opening Writing instrument with slide stopper.