JP4180183B2 - Liquid writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid writing instrument. More specifically, the present invention relates to a liquid writing instrument of a type that opens a valve device by tilting a pen body by writing pressure. In the present invention, “front” refers to the pen tip side, and “rear” refers to the ink tank side.
[0002]
[Prior art]
Conventionally, for example, in Japanese Utility Model Publication No. 54-40099, a ring valve made of an elastic material is in close contact with a valve seat surface in a radial direction, and a pen body caused by writing pressure (that is, a contact force between a paper surface and a pen body during writing). There is disclosed a liquid writing instrument of the type in which the ring valve is elastically deformed in the radial direction and the valve device is opened by the tilting operation.
[0003]
[Problems to be solved by the invention]
In the conventional liquid writing instrument, the valve device has a seal structure only in the radial direction between the ring valve and the valve seat surface. The elastic action in the radial direction gradually decreases, and the sealing performance between the ring valve and the valve seat surface is loosened. As a result, ink may leak out from the pen tip when not writing.
[0004]
In addition, the conventional liquid writing instrument has a configuration in which a fulcrum for tilting the pen body is located behind the seal portion, and when the pen body tilts, a soft ring valve made of an elastic material is used as a hard valve seat. It is the structure which presses against a surface and carries out compression deformation. Therefore, even if it is possible to slightly open the seal portion by the operation of the pen body, it is difficult to open the seal portion largely. Therefore, when writing, the ink outflow from the pen tip becomes insufficient, and the handwriting often blurs.
[0005]
The present invention solves the above-mentioned conventional problems, maintains a sufficient sealing performance at the seal portion, there is no risk of ink leakage even in a non-use state for a long time, An object of the present invention is to provide a liquid writing instrument provided with a valve device capable of obtaining sufficient ink spillability during writing.
[0006]
[Means for Solving the Problems]
[1] The present invention includes an annular first valve portion 41 that is displaceable in the radial direction in accordance with the tilting of the pen body 2 due to writing pressure, in the main body 3 between the pen body 2 and the ink tank 31. Provided with a first seal portion 4 composed of an outer peripheral portion of the first valve portion 41 and an annular first seat portion 42 which is in close contact with the radial direction, and the first valve portion is tilted by the pen body 2 by writing pressure. 41 or a liquid writing instrument 1 in which the first seat portion 42 is elastically deformed in the radial direction to open the first seal portion 4, and a main body 3 between the pen body 2 and the ink tank 31. An annular second valve portion 51 that is urged forward in the axial direction and can be retracted as the pen body 2 is retracted by writing pressure, and an annular second valve portion 51 that is in close contact with the second valve portion 51 in the axial direction. a second sealing portion 5 formed of the second seat 52 is provided, the first seat 42 and the second seat portion 52 is formed integrally with the valve 9 provided in the main body 3 the inner surface, writing time, it causes opening the first seal portion 4 by tilting of the pen body 2 by writing pressure, retracting the second valve portion 51 by the retraction of the pen body 2 by writing pressure It is a requirement that the second seal portion 5 is opened (claim 1).
[0007]
(Function)
When not writing, the first seal portion 4 (axial seal portion) and the second seal portion 5 (radial seal portion) are in a closed state. At the time of writing, first, the pen body 2 is retracted in the axial direction by the writing pressure, and accordingly, the second valve portion 51 is retracted in the axial direction against the forward urging by the spring or the like. The close state in the axial direction between the second valve portion 51 and the second seat portion 52 is released, and the second seal portion 5 opens.
[0008]
Furthermore, the pen body 2 is tilted by the writing pressure at the same time when the pen body 2 is retracted or after the pen body 2 is retracted. That is, at the same time when the second seal portion 5 is opened or after the second seal portion 5 is opened, the first valve portion 41 is displaced in the radial direction as the pen body 2 is tilted, and the first valve Due to the elastic deformation of the part 41 or the first seat part 42, a part of the first valve part 41 and the first seat part 42 in the radial close state is released, and the first seal part 4 is opened. (See FIG. 6).
[0009]
That is, when the first seal portion 4 is opened, at least the second seal portion 5 is in an open state, and the first seal portion 4 and the second seal portion 5 are opened, whereby the ink tank Ink is supplied from 31 to the pen body 2.
[0010]
Therefore, even if the seal structure of the first seal portion 4 becomes loose due to a long-term non-use state, the second valve portion 51 is forcibly urged in the axial direction by a spring or the like so that the second seat Close to the part 52. Thereby, since reliable sealing performance is obtained by the second seal portion 5, ink leakage during non-writing can be sufficiently suppressed.
The liquid writing instrument 1 according to claim 1 is provided with the valve seat 9 in which the first seat portion 42 and the second seat portion 52 are integrally formed on the inner surface of the main body 3, thereby reducing the number of parts. A simple structure that is easy to assemble can be provided at low cost.
[0011]
[2] In the liquid writing instrument 1 according to the first aspect, a support portion 6 that restricts rearward movement of the pen body 2 and serves as a fulcrum for tilting the pen body 2 is provided on the inner surface of the main body 3 (claim 2). Is preferred.
[0012]
(Function)
At the time of non-writing, the support part 6 is in a non-contact state with the pen body 2 (the locking part 21a) in the axial direction, and the first seal part 4 and the second seal part 5 are in a closed state. Then, at the time of writing, the pen body 2 is retracted by the writing pressure, the support portion 6 and the pen body 2 are in contact with each other in the axial direction, and the rearward movement of the pen body 2 is restricted. Opens in the axial direction. At the same time or after the second seal portion 5 is opened, the pen body 2 is supported in the radial direction by the support portion 6, and the first seal portion 4 is opened by the tilting of the pen body 2 due to writing pressure. Is done.
[0013]
That is, according to the above configuration (Claim 2), since the support portion 6 is configured to support the pen body 2 in the axial direction and the radial direction, at least the second seal portion 5 when the first seal portion 4 opens. Can be opened.
[0014]
The support 6 abuts the pen body 2 at least in the axial direction, and restricts rearward movement of the pen body 2. Thereby, the opening amount of the second seal portion 5 in the axial direction is restricted, and an appropriate ink outflow amount can be adjusted regardless of the magnitude of the writing pressure. Note that the axial gap L between the pen body 2 and the support portion 6 (that is, the opening amount of the second seal portion 5 in the axial direction) is an appropriate amount of ink outflow and uncomfortable in the axial direction of the pen body 2 during writing. Considering suppression of rattling, 1 mm or less (preferably 0.5 mm or less) is preferable.
[0015]
In addition, the support unit 6 supports the pen body 2 in the axial direction and restricts the rearward movement of the pen body 2, and supports the pen body 2 in the radial direction as a fulcrum for tilting the pen body 2. Since it also has a function, it is not necessary to separately provide a portion to be supported in the axial direction and a portion to be supported in the radial direction, and the whole structure can be simplified.
[0016]
[3] In the liquid writing instrument 1 according to the second aspect, it is preferable that the support portion 6 is provided in front of the first seal portion 4 (Claim 3).
[0017]
The configuration in which the support portion 6 is provided at the front position from the first seal portion 4 is the first with respect to the tilt amount of the pen body 2 as compared with the configuration in which the support portion 6 is provided at the rear side from the first seal portion 4. The radial displacement of the valve portion 41 can be increased, and by the slight tilting of the pen body 2, it is possible to obtain a sufficient opening amount (that is, ink outflow property) of the first seal portion 4.
[0018]
[4] In the liquid writing instrument 1 according to the first aspect, the first seat portion 42 is configured to be softer than the first valve portion 41, and the first seat portion 42 is disposed outside the first seat portion 42. It is preferable to provide a relief space 32 in which one seat portion 42 can be deformed radially outward (Claim 4).
[0019]
With the above configuration, the first seat 42 can be easily elastically deformed radially outward. Thereby, the first seal portion 4 can be opened for a slight tilting operation of the pen body 2 (that is, the tilting amount and the tilting power), and a sufficient ink discharge amount during writing can be secured.
[0020]
[5] In the liquid writing instrument 1 of claim 1, the valve body 8 in which the first valve portion 41 and the second valve portion 51 are integrally formed is provided on the outer surface of the rear end portion of the pen body 2. (Claim 5) is preferable.
[0021]
With the above-described configuration, the number of parts is reduced, a simple structure that is easy to assemble can be provided, and can be provided at a low cost.
[0022]
[0023]
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0025]
[First embodiment]
1 to 6 show a first embodiment of the present invention.
The liquid writing instrument 1 of the present embodiment is mainly provided with a pen body 2 that is movable in the axial direction and the radial direction at the tip of a main body 3 that becomes an ink tank 31, and the pen body 2 and the ink tank in the main body 3 are provided. In the ink flow path between 31, a first seal portion 4 that opens due to the radial displacement of the pen body 2 and a second seal portion 5 that opens when the pen body 2 moves rearward in the axial direction are disposed. This is the configuration.
[0026]
Further, the first seal portion 4 and the second seal portion 5 of the present embodiment include a valve body 8 in which a first valve portion 41 and a second valve portion 51 are integrally formed, and a first seat portion. 42 and the valve seat 9 which formed the 2nd seat part 52 integrally. In this embodiment, the second seal portion 5 is arranged in front of the first seal portion 4.
[0027]
The main body 3 is a bottomed cylindrical body, and an ink tank 31 is formed at the rear portion, and a cylindrical front body 33 is fitted on the inner surface of the front end opening. An annular valve seat 9 made of an elastic material is fixed to the inner surface of the main body 3 behind the front body 33, and a spring seat 36 is fixed to the rear of the valve seat 9.
[0028]
The pen body 2 is a rod-shaped fiber bundle resin processed body having a step portion on the outer surface of the intermediate portion. A cylindrical pen body cover 21 is fixed to the outer peripheral surface of the stepped portion, and a bottomed cylindrical valve body 8 is attached to the outer peripheral surface of the rear end. An ink absorber 38 made of a porous material such as sponge is disposed on the outer peripheral surface of the pen body 2 between the pen body cover 21 and the valve body 8 (that is, behind the support portion 6 in the tip body 33). .
[0029]
On the inner surface of the front body 33, a support portion 6 made of a plurality of (in this case, three) inward projections is formed (see FIG. 4). At the time of writing, due to the retraction of the pen body 2 by the writing pressure, the rear side surface of the stepped locking portion 21a on the outer surface of the pen body cover 21 abuts the front side surface of the support portion 6 in the axial direction. Movement is restricted.
[0030]
The valve body 8 is a bottomed cylindrical body made of a synthetic resin that is harder than the valve seat 9, and includes a first valve portion 41 formed of an annular protrusion integrally formed on the front outer peripheral surface thereof, And a second valve portion 51 formed of an annular flat surface formed integrally with the front end surface of the valve body 8 in front of the valve portion 41. A spring receiving step is integrally formed on the outer peripheral surface of the rear portion of the valve body 8. Further, a pen body mounting hole 81 is provided at the front end of the valve body 8, and the rear end portion outer peripheral surface of the pen body 2 is fitted therein. Further, the valve body 8 is urged forward by a compression coil spring 37 locked to the spring receiving step portion, and when not written, the second valve portion 51 and the second seat portion 52 are connected to each other. Close to the axial direction.
[0031]
The valve seat 9 is a cylindrical body in which a flange portion at the front end portion and a cylindrical portion extending rearward from the flange portion are integrally formed of an elastic material (for example, synthetic rubber or thermoplastic elastomer). The valve body 8 is configured to be softer (that is, the first seat portion 42 is configured to be softer than the first valve portion 41). Further, the valve seat 9, the first valve portion 41 is capable close sliding first seat 42 of the cylindrical inner surface to the valve body together when it is formed integrally 8, the first The second valve portion 51 is formed integrally with the inner surface of the cylindrical portion in front of the seat portion 42, and the second valve portion 51 is formed of an annular step portion that can come into close contact in the axial direction.
[0032]
The valve seat 9 is fixed to the inner surface of the main body 3 by the flange portion. An annular relief space 32 for easily elastically deforming the cylindrical portion radially outward between the outer surface of the cylindrical portion including the first seat portion 42 of the valve seat 9 and the inner surface of the main body 3. Is provided.
[0033]
The first seal portion 4 of the present embodiment is opened and closed in the radial direction, and can be brought into close contact with each other in the radial direction. The first valve portion 41 of the valve body 8 and the first seat portion 42 of the valve seat 9 Consists of. On the other hand, the second seal portion 5 of the present embodiment opens and closes in the axial direction and can be in close contact with each other in the axial direction, and the second valve portion 51 of the valve body 8 and the second seat portion 52 of the valve seat 9. It consists of.
[0034]
The spring seat 36 is fixed to the inner surface of the main body 3, supports the rear end portion of the coil spring 37 in the axial direction, and supports the outer peripheral surface of the coil spring 37 in the radial direction by a plurality of ribs 36a on the inner surface. An ink circulation hole 36b is opened at the center of the spring seat 36 (see FIG. 5).
[0035]
In addition, the gap L in the axial direction between the pen body 2 and the support portion 6 in this embodiment (that is, the movable amount L in the axial direction of the pen body 2) is set to 0.1 mm to 0.5 mm (FIG. 2). reference). Further, the amount of biting D in the radial direction between the first valve body 8 and the first valve seat 9 (that is, the amount D of the first valve body 8 embedded in the first valve seat 9) is 0.1 mm. It is set to ˜0.5 mm (see FIG. 3).
[0036]
An outer cylinder 35 is attached to the outer surface of the main body 3. Between the outer cylinder 35 and the inner surface of the main body 3, a heat insulating space including an annular gap is formed. The heat insulation space can prevent the air in the ink tank 31 from expanding due to the body temperature of the hand, and can prevent ink leakage from the pen tip. The heat insulating space may be blocked from the outside air by attaching the outer cylinder 35, or may be communicated with the outside air by a vent hole or the like provided in the outer cylinder 35.
[0037]
[Second Embodiment]
FIG. 7 shows a second embodiment.
This embodiment is a modification of the first embodiment, and is different from the first embodiment in that the spring seat 36 is integrally formed on the inner surface of the main body 3 and the rear end opening of the main body 3. The tail plug 34 of the member is fitted. Other configurations are the same as those of the first embodiment.
[0038]
[Third embodiment]
8 and 9 show a third embodiment.
This embodiment differs greatly from the first and second embodiments in that the spring seat 36 that supports the compression coil spring 37 that biases the valve body 8 forward restricts the backward movement of the valve body 8 and The other structure is the same as that of the first and second embodiments in that it functions as a support portion 6 that serves as a tilting fulcrum of the valve body 8.
[0039]
That is, the valve body 8 includes a pen body mounting hole 81 at the front end, a main valve portion integrally provided with the first valve portion 41 on the outer peripheral surface and the second valve portion 51 on the front end surface, and the main valve portion. It consists of the rod-shaped part extended back from the valve part.
[0040]
The spring seat 36 is fixed to the inner surface of the main body 3, has an ink circulation hole 36 b on the outer peripheral surface, and has a support hole 36 c that supports the rear end portion of the valve body 8 on the shaft center. The rear end portion of the rod-shaped portion has a contact portion 82 formed of a conical tapered surface, and the contact portion 82 is configured to be able to contact the front end edge of the support hole 36c of the spring seat 36. . At the time of writing, when the pen body 2 is retracted by writing pressure, the abutting portion 82 of the rear end portion of the rod-shaped portion is abutted and supported by the front end edge of the support hole 36c, and the rearward movement of the valve body 8 is restricted. . In addition, the valve seat 9 and the valve body 8 are supported in the radial direction by the contact support between the support hole 36c and the rod-shaped contact part 82, and this is supported by the pen body 2 (valve body 8) at the time of writing. It can be used as a fulcrum for tilting.
[0041]
In addition, the said 1st valve part 41 and the 2nd valve part 51 of a present Example are comprised by the annular protrusion. Further, the amount D of the first valve portion 41 embedded in the second valve seat 9 is set to 0.1 to 0.5 mm as in the first and second embodiments. Further, the axial gap L between the pen body 2 and the support portion 6 is set to 0.1 mm to 0.5 mm.
[Fourth embodiment]
FIG. 10 shows a fourth embodiment.
The major difference of the present embodiment from the first to third embodiments is the shape of the valve body 8 and the valve seat 9 (that is, the shape of the second seal portion 5). The same as in the third embodiment.
[0043]
The valve body 8 includes a main valve portion having a pen body mounting hole 81 on the front end surface and an annular flange on the outer peripheral surface of the front end portion, and a rod-like portion integrally extending behind the main valve portion. Become. The outer peripheral portion of the flange portion becomes the first valve portion 41 that can be in close contact with the first seat portion 42 in the radial direction, and the tapered front surface thereof can be in close contact with the second seat portion 52 in the axial direction. The second valve portion 51 has a tapered shape.
[0044]
The valve seat 9 includes a flange portion and a cylindrical portion, and is integrally formed of an elastic material. On the inner surface of the cylindrical portion, a first seat portion 42 on which the first valve portion 41 on the outer periphery of the flange portion of the valve body 8 can slide closely, and a tapered shape on the front surface of the flange portion of the valve body 8 are formed. The second valve portion 51 includes a taper-shaped second seat portion 52 that can be closely contacted in the axial direction. The flange portion of the valve seat 9 is fixed to the inner surface of the main body 3, and an annular relief is provided between the inner surface of the main body 3 and the outer surface of the cylindrical portion including the first seat portion 42 and the second seat portion 52. A space 32 is formed.
[0045]
Further, the pen body cover 21 is provided with a locking portion 21a projecting from the front end portion of the pen body 33 so as to abut and support the support portion 6 on the inner surface of the tip body 33 in the axial direction and the radial direction. An ink circulation hole 21b with the outer surface of the body 2 is provided. The rear end portion of the pen body cover 21 is in contact with the front end portion of the valve body 8.
[0046]
[Fifth embodiment]
FIG. 11 shows a fifth embodiment.
The first embodiment is greatly different from the first to fourth embodiments in that the positional relationship between the first seal portion 4 and the second seal portion 5 is reversed, and the valve element 8 is replaced by a valve seat 9. The other configurations are the same as those of the first to fourth embodiments.
[0047]
The valve body 8 is attached to the outer peripheral surface of the rear end portion of the pen body 2 via a pen body cover 21, and the valve body 8 can be retracted as the pen body 2 is retracted. The valve body 8 is formed by integrally forming a cylindrical portion and a flange portion provided at the rear end of the cylindrical portion with an elastic material. A first valve portion 41 made of an annular protrusion is integrally formed on the outer peripheral surface of the cylindrical portion, and the front surface of the flange portion is an annular second valve portion 51.
[0048]
An inner surface of the tip 33 attached to the tip of the main body 3 is provided with an annular first seat portion 42 on which the first valve portion 41 can slide closely. In addition, the rear end surface of the front body 33 is an annular second seat portion 52 with which the second valve portion 51 can closely contact in the axial direction. That is, the first seal portion 4 is in a front position relative to the second seal portion 5. When the pen body 2 is tilted, the soft first valve portion 41 is elastically deformed by pressure contact with the hard second seat portion 52, and the first seal portion 4 is opened.
[0049]
[Sixth embodiment]
FIG. 12 shows a sixth embodiment.
The present embodiment is a modification of the first embodiment, and is greatly different from the first embodiment in that, in addition to providing the support portion 6 that restricts the backward movement of the pen body 2, the valve body that is further retracted is provided. The restricting portion 7 that is in contact with the abutting portion 82 of 8 and restricts the rearward movement of the valve body 8 is provided at the back of the valve body 8 on the inner surface of the main body 3.
[0050]
The axially movable amount L of the pen body 2 is based on the positional relationship between the support portion 6 and the second seal portion 5 (that is, the distance between the front side surface of the support portion 6 and the second seat portion 52, the pen body cover 21). The difference between the rear side surface of the locking portion 21a and the distance between the second valve portion 51).
[0051]
The distance M between the restricting portion 7 and the contact portion 82 of the valve body 8 is set in advance equal to the axially movable amount L of the pen body 2. Therefore, when the attachment structure of the pen body 2 and the valve body 8 is based on the fitting between the rear end portion of the pen body 2 and the pen body mounting hole 81 of the valve body 8, the pen body 2 is a pen of the valve body 8 due to an impact or the like. Even if it falls out of the body mounting hole 81, the pen body 2 can be inserted into the pen body mounting hole 81 of the valve body 8 again to set an appropriate axially movable amount L.
[0052]
[Seventh embodiment]
FIG. 13 shows a seventh embodiment.
The present embodiment is a modification of the sixth embodiment, and is greatly different from the sixth embodiment in that a spring seat 36 having a restricting portion 7 is provided as a separate member and fixed to the inner surface of the main body 3. The configuration is the same as that of the sixth embodiment.
[0053]
[Others]
In addition, as a configuration of the ink tank 31 of the present invention, the rear end of the ink tank 31 is closed, and in addition to the configuration of this embodiment in which air is taken in from the outside through the valve device as the ink is consumed, for example, the ink tank 31 moves forward as the ink is consumed. The structure which provided the following body (for example, a grease-like thing, an elastic body, a piston, etc.) to perform inside, or the structure which consists of a flexible bag body which shrinks with ink consumption, etc. are mentioned.
[0054]
In addition to the fiber pen body, the pen body 2 of the present invention includes, for example, a ballpoint pen chip, a pipe chip, a fountain pen metal plate pen body, a brush pen body, a porous pen body, a plastic extrusion-molded pen body, and the like. be able to.
[0055]
【The invention's effect】
According to the first aspect of the present invention, even if the sealing performance of the first sealing portion is loosened, the second sealing portion can provide a reliable sealing performance, so that ink leakage during non-writing can be sufficiently suppressed.
[0056]
According to the invention of claim 2, since the support portion is configured to support the pen body in the axial direction and the radial direction, when the first seal portion opens, at least the second seal portion can be opened. At the same time, the entire structure can be simplified. In addition, an appropriate ink outflow amount can be adjusted regardless of the magnitude of the writing pressure.
[0057]
According to the invention of claim 3, it is possible to obtain a sufficient ink outflow property by a slight tilting of the pen body.
[0058]
According to the invention of claim 4, the first seal portion can be opened with a slight tilt of the pen body, and a sufficient ink discharge amount at the time of writing can be secured.
[0059]
According to the invention of claim 5, the number of parts is reduced, a simple structure that is easy to assemble is provided, and can be provided at low cost.
[0060]
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.
FIG. 2 is an enlarged view of a part S in FIGS. 1 and 7;
FIG. 3 is an enlarged view of a T portion in FIGS. 1 and 7;
4 is a cross-sectional view taken along line AA in FIG.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is an operation explanatory diagram at the time of writing in the first embodiment.
FIG. 7 is a longitudinal sectional view showing a second embodiment of the present invention.
FIG. 8 is a longitudinal sectional view showing a third embodiment of the present invention.
FIG. 9 is an enlarged view of a U part in FIG. 8;
FIG. 10 is a longitudinal sectional view showing a fourth embodiment of the present invention.
FIG. 11 is a longitudinal sectional view showing a fifth embodiment of the present invention.
FIG. 12 is a longitudinal sectional view showing a sixth embodiment of the present invention.
FIG. 13 is a longitudinal sectional view showing a seventh embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid-type writing instrument 2 Pen body 21 Pen body cover 21a Locking part 21b Ink distribution hole 3 Main body 31 Ink tank 32 Escape space 33 Front body 34 Tail plug 35 Outer cylinder 36 Spring seat 36a Rib 36b Ink distribution hole 36c Support hole 37 Coil Spring 38 Ink absorber 4 First seal portion 41 First valve portion 42 First seat portion 5 Second seal portion 51 Second valve portion 52 Second seat portion 6 Support portion 7 Restriction portion 8 Valve body 81 Pen body mounting hole 82 Abutting portion 83 Push rod 9 Valve seat 10 Paper surface L Clearance D in the axial direction between the pen body and the support portion D Biting amount M in the radial direction between the first valve body and the first valve seat Restricting portion Between the valve element and the valve contact part

Claims (5)

An annular first valve portion (41) displaceable in the radial direction as the pen body (2) is tilted by writing pressure in the main body (3) between the pen body (2) and the ink tank (31). A first seal portion (4) comprising an outer peripheral portion of the first valve portion (41) and an annular first seat portion (42) closely in the radial direction is provided, and a pen body (2 ) Is a liquid writing instrument in which the first seal portion (4) is opened by elastically deforming the first valve portion (41) or the first seat portion (42) in the radial direction. In the main body (3) between the pen body (2) and the ink tank (31), the ring body is urged forward in the axial direction and can be retracted as the pen body (2) is retracted by writing pressure. A second seal portion (5) comprising a second valve portion (51) and an annular second seat portion (52) that is in close contact with the second valve portion (51) in the axial direction is provided. Said first seat (42) and the provided second seat (52) is a valve seat formed integrally (9) to the body (3) inner surface, writing time, the pen body by writing pressure (2) The first seal part (4) is opened by the tilt of the second seal part (4), and the second valve part (51) is retracted by the retraction of the pen body (2) by writing pressure, thereby the second seal part (5). A liquid-type writing instrument characterized by being made to open. The liquid writing instrument according to claim 1, wherein a support portion (6) for restricting rearward movement of the pen body (2) and serving as a fulcrum for tilting the pen body (2) is provided on the inner surface of the main body (3). The liquid writing instrument according to claim 2, wherein the support portion (6) is provided in front of the first seal portion (4). The first seat portion (42) is configured to be softer than the first valve portion (41), and the first seat portion (42) has a diameter outside the first seat portion (42). The liquid writing instrument according to claim 1, further comprising a relief space (32) that is deformable outward in the direction. The liquid type according to claim 1, wherein a valve body (8) in which the first valve portion (41) and the second valve portion (51) are integrally formed is provided on an outer surface of a rear end portion of the pen body (2). Writing instrument.

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