JPH0692082A - Writing tool - Google Patents

Abstract

PURPOSE:To prevent inflow of air from a pen body, adjust flow rate of ink to be supplied to a core tip so as to make operation always smooth. CONSTITUTION:On an end of a cylindrical ink tank 2 having an ink reservoir 3 formed therein, a pen body 4 slidable in the axial direction is mounted, and a tail plug 10 is embedded in other end. A slidable slide plug 5 is arranged in contact with the back end of the ink reservoir 3 and a diaphragm member 6 is arranged between the ink reservoir 3 and the pen body 4 so as to open/close an ink passage. In a center hole 13 of a core holder 12 constituting the pen body 4, a flow rate adjusting body 7 consisting of a porous body is arranged. When the core holder 12 is pushed and the diaphragm member 6 is bent, the ink passage is opened so that the flow rate adjusting body 7 adjusts the flow rate of ink.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument such as a whiteboard marker or a felt tip pen, and more particularly to a construction of the writing instrument which prevents the pen body from drying.

[0002]

2. Description of the Related Art In a writing instrument such as a felt tip pen, an ink tank is filled with a porous material such as batting and the ink is held in the batting by a capillary force. However, the amount of ink that can be held becomes small. In addition, when writing quickly, the ink supply from the batting to the felt tip was small, so there was a problem such that the handwriting was faint.

[0003]
Therefore, as disclosed in JP-A-3-13396, the liquid ink is directly stored in the cylindrical ink storage chamber, and the ink and the air are separated from each other in a slidable manner. While inserting the slide stopper, a cylindrical valve body having a valve seat that allows the flow of ink only in the pen body direction is provided between the ink storage chamber and the pen body provided at the tip, and the valve body is further provided. An auxiliary ink chamber is formed between the pen body and the pen body.

[0004]

In the writing instrument of this structure, since the batting is omitted, a large amount of ink can be stored in the ink storage chamber, and the ink storage chamber can be stored in accordance with the amount of ink consumed by writing. Since the slide plug slides and the valve body opens to replenish the consumed ink amount, there is an advantage that handwriting does not fade.

However, although the valve element provided between the pen body and the ink storage chamber is a check valve, it is set to open with a small negative pressure by writing, so the cap is closed. If the cap pressure is high at this time, air may enter the sub ink chamber from the pen body or may open the valve seat in the opposite direction to enter the ink storage chamber.

Then, when air enters the sub ink chamber, the invading air blocks the ink passage, which causes a writing problem. Further, when air enters the ink storage chamber, it stays in the sliding portion of the slide stopper, and the air serves as a cushioning material so that the writing pressure does not act directly on the slide stopper, making sliding impossible. This will cause writing problems.

In addition, when a high writing pressure is applied to the pen body during writing, the valve seat of the valve body is deformed, such that the valve seat rises and cannot function as a one-way valve, so that ink is continuously flown to the pen body, There is a problem that it causes dripping.

Therefore, the present invention provides a writing instrument in which air does not enter from the pen body even when the cap is closed, the flow rate of ink is suppressed even at the writing pressure, and the writing instrument is always operated smoothly. With the goal.

[0009]

To achieve this object, the present invention provides a cylindrical ink tank having an ink storage chamber for storing ink therein, and an axial direction mounted on one of the ink tanks. And a pen body that is slidable in the ink tank and that is provided in the ink tank to cut off the space between the ink storage chamber and the pen body, and the ink storage chamber and the pen body when the pen body is press-fitted into the ink tank. And a diaphragm member for communicating with each other, and a flow rate adjusting body made of a porous body is disposed inside the pen body.

[0010]

When the writing pressure applied to the pen is applied to the pen body, the pen body presses the diaphragm member and bends to communicate with the ink storage chamber. The ink in the ink storage chamber flows into the pen body, but the flow rate adjuster buffers the flow of the ink to control the flow of ink and prevent problems such as dripping.

Further, even if the state in which the cap is opened is continued, the ink is replenished from the flow rate adjusting body to prevent fading of writing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The writing instrument 1 of the present invention shown in FIGS. 1 and 2 has an ink tank 2 in which an ink storage chamber 3 is formed, a pen body 4 attached to one end of the ink tank 2, and an ink tank 2. A slidable slide stopper 5 for partitioning ink and air inside the other of the above, and a diaphragm member 6 arranged in the ink tank 2 for opening and closing a passage between the pen body 4 and the ink storage chamber 3. The pen body 4 is provided with a flow rate adjusting body 7.

The ink tank 2 is formed of, for example, a synthetic resin such as polypropylene and has a transparent cylindrical shape having an appropriate length, and an ink storage chamber 3 is formed in the internal space of the ink tank 2 for writing ink. Is filled. The ink storage chamber 3
A slide stopper 5 is inserted in the rear end portion side in a liquid-tight manner and is slidable in the axial direction.

The slide stopper 5 is formed of an elastic material such as silicone rubber and has a slightly tapered hollow cylindrical shape. A seal portion 8 is formed on the peripheral edge of the rear end of the slide stopper 5, and the seal portion 8 is in close contact with the inner peripheral surface of the ink storage chamber 3 to maintain liquid tightness. Ink tank 2 behind the slide stopper 5
A tail plug 10 having an atmosphere communication hole 9 is attached to the open end, and the inside of the ink tank 2 is communicated with the atmosphere through the atmosphere communication hole 9. Further, a lubricant such as paraffin is applied to the inside of the ink tank 2 between the slide stopper 5 and the tail stopper 10 to facilitate sliding of the slide stopper 5.

A pen body 4 is arranged at the front end of the ink tank 2. As shown in FIG. 2, the pen body 4 includes a core 11 in which fibers are hardened at a high density, a core holder 12 that holds the core 11 and is slidable in the tip end of the ink tank 2 in the axial direction. The flow rate adjusting body 7 is arranged in a center hole 13 defined in the wick holder 12.

In the core holder 12, the core 11 is inserted into an opening at the tip of a center hole 13 bored in the central axial direction, and the side wall near the rear end protruding in a small diameter communicates with the center hole 13 and an axis line. A porous portion 14 is provided in a direction orthogonal to the. Also, the core 11 and the hole 14
A flow rate adjuster 7 made of a porous material such as urethane foam or batting is disposed in the center hole 13 of the.

The diaphragm holder 6 is fixed in the ink tank 2 by bending the rear end of the core holder 12 having a small diameter, and the inner peripheral wall of the diaphragm member 6 closes the hole 14.

Reference numeral 15 is a cap.

The operation of the writing instrument 1 having the above structure will be described in detail.

When the cap 15 is removed, the solvent contained in the ink held on the wick 11 diffuses into the atmosphere and the wick 11 begins to dry. The stored ink is supplied to the core 11, and writing can be performed from the beginning of writing without causing a blur phenomenon.

When the writing pressure is applied to the lead 11, the lead holder 12 slides toward the ink storage chamber 3 side by the writing pressure, pushes and bends the diaphragm member 6 toward the ink storage chamber 3, and at the same time, the ink storage chamber 3 is pressed. Pressurize the inside and attach the slide stopper 5 to the tail stopper 10
Slide slightly to the side. Then, the hole 14 at the end of the core holder 12 is separated from the inner peripheral wall of the diaphragm member 6, the ink storage chamber 3 and the central hole 13 communicate with each other, and the ink flows from the ink storage chamber 3 to the central hole 13 to adjust the flow rate. The slider plug 5 slides in the ink tank 2 toward the pen body 4 side while moving toward the core 11 via the body 7 due to the decrease in ink.

When the writing pressure is no longer applied, the core holder 12 is slid toward the tip of the ink tank 2 by the elastic force of the diaphragm member 6 so as to be in the initial state. Therefore, the hole 14
Though the ink adheres to the inner peripheral wall of the diaphragm member 6 to stop the flow of the ink, the ink collects in the flow rate adjusting body 7, so that the ink can be continuously supplied to the core 11. In addition, pen body 4
Even when a large writing pressure is applied, the flow rate adjuster 7 has a buffering effect of temporarily storing the ink, so that it is possible to prevent dripping from the core 11.

FIG. 3 shows a second embodiment according to the present invention,
The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, the core holder 20 has a core 11 inserted at the tip of a center hole 13 formed in the central axial direction,
On the side wall near the rear end protruding in a small diameter, a hole portion 14 is bored in a direction communicating with the central hole 13 and orthogonal to the axis. And
An annular groove 21 is defined on the outer periphery of the center of the core holder 20. The annular groove 21 surrounds the core holder 20, and a flow rate adjuster 22 made of a porous material such as urethane foam or batting is provided. There is.
A plurality of holes 23 and 24 are formed at both ends of the annular groove 21 to form a central hole.
It communicates with 13.

When the cap 15 is removed, the flow rate adjusting member is provided through the holes 23 and 24 to the wick 11 which has begun to dry due to the dispersion of the solvent.
The ink stored in 22 is supplied, and it is possible to write without causing the blur phenomenon from the beginning of writing.

When writing pressure is applied, the wick holder 20 slides to press and bend the diaphragm member 6 toward the ink storage chamber 3 and slide the slide plug 5 (not shown) toward the tail plug 10. The hole 14 at the end of the core holder 20 is separated from the inner peripheral wall of the diaphragm member 6, and the ink flows from the ink storage chamber 3 through the center hole 13 toward the core 11. At this time, a part of the ink is stored in the flow rate adjusting body 22 through the holes 23 and 24. Further, even when a large writing pressure or impact is applied to the pen body 4, the flow rate adjusting body 22 performs a buffering action via the holes 23 and 24, so that it is possible to prevent the drop of the wick 11 from the core 11. .

[0027]

As described above, according to the present invention, the diaphragm member blocks the flow between the ink storage chamber and the pen body, and the porous body flow rate adjusting body is disposed inside the pen body, so the cap is closed. Even if air enters the pen body from the core at this time, it is captured by the flow rate adjusting body, and when rewriting, the air is carried away from the core to the outside together with the ink, thus causing no writing defect.

Further, even if the writing pressure is abnormally increased, the flow rate adjusting body of the porous body can be prevented from falling down from the core due to the resistor or suction action.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a writing instrument according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

FIG. 3 is an enlarged vertical sectional view of a main part according to another embodiment.

[Explanation of symbols]

 1 Writing instrument 2 Ink tank 3 Ink storage chamber 4 Pen body 5 Slide stopper 6 Diaphragm member 7 Flow rate adjuster 11 Core 12, 20 Core holder 13 Center hole

Claims (4)

[Claims] 1. A cylindrical ink tank in which an ink storage chamber for storing ink is formed, a pen body attached to one of the ink tanks and slidable in an axial direction, and provided in the ink tank. And a diaphragm member that disconnects the ink storage chamber and the pen body from each other and connects the ink storage chamber and the pen body when the pen body is press-fitted into the ink tank. A writing instrument characterized in that a flow rate adjusting body made of a porous body is arranged on the inside. 2. A pen body is provided with a core holder having a center hole bored in the axial direction, a core inserted into one end of the center hole of the core holder, and a center hole near the core. The writing instrument according to claim 1, comprising a flow rate adjuster. 3. A core holder in which a pen body has a center hole bored in the axial direction, an annular groove is defined on the outer periphery, and a plurality of hole portions which connect the annular groove and the center hole are bored. When,
The writing instrument according to claim 1, comprising a core inserted into one end of a center hole of the core holder, and a flow rate adjusting body that surrounds the annular groove and communicates with the center hole through a hole. . 4. The writing instrument according to claim 1, wherein the flow rate adjusting body is a urethane foam or a batting fiber core.