JP3179589B2 - Writing implement - Google Patents

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 and a felt tip pen, and more particularly to a writing instrument capable of removing air from ink and preventing ink from flowing out due to excessive writing pressure. About.

[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 porous material holds the ink by capillary force.
The amount of ink that can be held is reduced, and when writing is performed quickly, the amount of ink supplied from the porous material to the felt chip is small, so that there is a problem such as handwriting being blurred.

For this reason, as disclosed in JP-A-3-13396, a liquid ink is directly stored in a cylindrical ink storage chamber, and the ink and the air are partitioned in the ink storage chamber. A movable slide stopper is inserted, and a cylindrical valve body having a valve seat that allows the flow of ink only in the pen body direction is disposed between the slide valve and the pen body disposed at the tip of the ink storage chamber. Further, there has been proposed a writing implement in which a sub ink chamber is formed between a valve body and a pen body.

[0004]

In the writing implement of this configuration, since the batting is omitted, a large amount of ink can be stored in the ink storage chamber. As the slide stopper slides and the valve element opens to replenish the amount of ink consumed,
There is an advantage that handwriting is not faded.

However, if air remains in the ink storage chamber, air will accumulate in the sliding portion of the slide stopper, and the air will act as a buffer, and the pen pressure will not act on the slide stopper, making it impossible to slide. This may cause writing trouble. For this reason, the ink is filled while sucking the air in the ink storage chamber with a vacuum pump. However, there is a problem that the ink remains partially at the joint between the sub ink chamber and the pen body, and the writing condition is unstable. is there.

Accordingly, in the present invention, the partition wall between the diaphragm member and the ink storage chamber is formed to have a tapered annular slope so that air in the ink storage chamber can be removed, and the air is driven out by bringing the diaphragm member into contact. It is another object of the present invention to provide a writing instrument which always operates the slide stopper smoothly.

[0007]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a cylindrical ink tank having an ink storage chamber in which ink is stored, and a shaft mounted in one of the ink tanks. A pen body slidable in the same direction, an ink and an air at the other end of the ink storage chamber, and a slidable slide stopper, and the ink storage chamber and the pen provided in the ink tank. A diaphragm member that shuts off between the ink storage chamber and the ink storage chamber when the pen body is press-fitted into the ink storage chamber in a direction facing the ink storage chamber. Was formed in a tapered annular slope.

[0008]

When the pen pressure is applied to the pen body, the pen body presses the diaphragm member and bends the diaphragm member toward the ink storage chamber to abut on the annular inclined wall, thereby suppressing excessive bending of the diaphragm member. Therefore, the pen body does not largely enter the ink storage chamber and the flow rate of the ink is constant.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A writing instrument 1 according to the present invention shown in FIGS. 1 to 3 has an ink tank 2 in which an ink storage chamber 3 is formed, a pen body 4 provided at one end of the ink tank 2, and an ink tank. A slidable slide stopper 5 for partitioning ink and air inside the other of the two, a diaphragm member 6 disposed in the ink tank 2 for opening and closing a passage between the pen body 4 and the ink storage chamber 3; Consists of

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

The slide stopper 5 has an H-shaped cross section in which the annular seal portions 8 and 9 extend forward and backward, and is formed of an elastic member such as silicone rubber.
Keep liquid tight by closely contacting the inner peripheral surface. A tail plug 11 having an air communication hole 10 is attached to the open end of the ink tank 2 behind the slide plug 5, and the inside of the ink tank 2 communicates with the atmosphere through the air communication hole 10. In addition, slide stopper 5 and tail stopper
A lubricant such as paraffin is applied to the inside of the ink tank 2 during the period 11 to facilitate sliding of the slide stopper 5.

A pen body 4 is provided at a front end of the ink tank 2. As shown in FIG. 2, the pen body 4 has a core 12 having fibers hardened at a high density, a core holder 13 which holds the core 12 and is slidable in the tip of the ink tank 2, and The core 12 is inserted into the opening at the end of the center hole 14 formed in the center axis direction of the core holder 13, which is formed of the defined center hole 14,
A hole 15 is formed in a side wall near the rear end protruding to a small diameter in a direction communicating with the center hole 14 and orthogonal to the axis.

The diaphragm member 6 is fixed in the ink tank 2 by bending around the narrow diameter rear end of the core holder 13, and the inner peripheral wall of the diaphragm member 6 closes the hole 15. Further, the rear end of the diaphragm member 6 and the ink storage chamber 3
As shown in FIG. 2, the partition wall between them forms inclined walls 16 and 17 having a mountain-shaped cross section.

Reference numeral 18 is a cap.

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

When the cap 18 is removed and the wick 12 is pressed against the writing surface, the wick holder 13 is slid in the ink tank 2 by writing pressure, and the diaphragm member 6 is tilted by the rear end of the wick holder 13. While being bent toward the wall 16, the inside of the ink storage chamber 3 is pressurized to slightly slide the slide stopper 5 toward the tail stopper 11. Further, when the pen pressure is applied, the hole 15 at the end of the core holder 13 is separated from the inner peripheral wall of the diaphragm member 6, and the ink storage chamber 3 and the center hole 14 communicate with each other, and the ink storage chamber in which the ink is pressurized. 3 flows into the center hole 13. When the ink is reduced, the slide stopper 5 moves the pen body 4 in the ink storage chamber 3.
Slide to the side.

At this time, even if the writing implement 1 is strongly pressed against the writing surface, the diaphragm member 6 comes into contact with the inclined wall 16 and does not bend further to the ink storage chamber 3 side. To prevent ink drips and bleeding.

When the pen pressure is released, the diaphragm member 6
The lead holder 13 is slid forward by the resilience to the initial state, and the hole 15 is brought into close contact with the inner peripheral wall of the diaphragm member 6 to stop the flow of ink.

When filling the ink storage chamber 3 with ink, a predetermined amount of ink is injected into the ink storage chamber 3, and then the tail plug 11 of the writing instrument 1 is turned down and the core holder 13 is turned up. Invert. At this time, air collects on the inclined walls 16 and 17. Next, when the core holder 13 is pressed while the pipe communicating with the vacuum source is in contact with the core holder 13, the diaphragm member 6 is pressed.
Is bent and comes into contact with the inclined wall 16 to completely remove the air on the inclined wall 16 side and suck the air on the other inclined wall 17 side together with some ink. Therefore, when the ink is filled, the ink storage chamber 3
It is possible to provide a writing instrument that has no remaining air inside and can be written smoothly (see FIG. 3).

[0020]

As described above, according to the present invention, the partition wall between the diaphragm member and the ink storage chamber is formed to have a tapered annular slope. The member abuts against the annular inclination on the diaphragm member side, thereby restricting the sliding of the pen body and restricting the outflow of ink.Also, the air generated when the ink is filled into the ink storage chamber by the diaphragm member. It does not extrude and leaves air in the ink storage chamber.

[Brief description of the drawings]

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

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

FIG. 3 is an enlarged vertical sectional view of a main part when pen pressure is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Writing implement 2 Ink tank 3 Ink storage room 4 Pen body 5 Slide stopper 6 Diaphragm member 11 Tail stopper 13 Core holder 15 Hole part 16,17 Inclined wall

Claims (1)

(57) [Claims] A cylindrical ink tank having an ink storage chamber in which ink is stored; a pen body mounted on one of the ink tanks and slidable in an axial direction; While partitioning ink and air at the other end, a slidable slide stopper, provided in the ink tank, shuts off between the ink storage chamber and the pen body, and the pen body is connected to the ink storage chamber. A diaphragm member for communicating the ink storage chamber with the pen body when the ink cartridge is oriented and press-fitted, wherein a partition wall between the diaphragm member and the ink storage chamber is formed to have a tapered annular inclination. Writing implement.