JP2571111Y2 - Liquid writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid writing instrument.
More specifically, an ink flow rate adjusting mechanism is interposed between the ink storing section and the pen body, and the adjusting mechanism is operated by pressing the pen body urged forward to the rear, so that the pen body is moved from the ink storing section to the pen body. The present invention relates to a liquid writing instrument of a type for supplying ink to a writing instrument.

[0002]

2. Description of the Related Art Conventionally, in order to prevent excessive outflow of ink, a structure in which a valve portion protruding at a symmetrical portion is selectively seated on a valve seat portion having an ink outflow hole is disclosed in Japanese Utility Model Laid-Open No. 57-121.
No. 584.

[0003]

In the above-mentioned conventional structure, there is a possibility that excessive ink may flow out of the pen body by keeping both valves open and repeating the valve opening operation many times. Was. In addition, the amount of ink flowing out varies depending on the operation method, and a certain amount of ink cannot be reliably supplied to the pen body.

The present invention solves the above-mentioned conventional problems, and a liquid capable of reliably supplying a fixed amount of ink to a pen body without causing excessive outflow of ink (so-called dripping). It is intended to provide a writing instrument.

[0005]

The liquid writing instrument 1 according to the present invention comprises:
The ink flow rate adjusting mechanism 3 is interposed between the ink storing section 22 and the pen body 24, and the adjusting mechanism 3 is operated by pressing the pen body 24 urged forward to the rear, so that the ink storing section 22 A liquid writing implement of a type for supplying ink to the pen body 24, wherein the pen body 24 is provided in the front part of the barrel 2.
A piston member 5 that operates integrally with the piston member 5 and has a circumferential sliding contact portion on its outer surface;
A concave portion 6 for forming a small ink storage gap between the piston member 5 and the inner wall surface of the cylinder portion 41 is provided substantially at an intermediate position in the axial direction of the sliding contact portion of the piston member 5;
A front sliding contact portion 52 and a rear sliding contact portion 56 are formed with the piston member 5 pressed by the pen body 24.
When the piston member 5 advances due to the release of the pressure, the front sliding contact portion 52 is brought into a non-contact state with the inner wall surface of the cylinder portion 41 due to the backward sliding. And at least one of the front sliding contact portion 52 and the rear sliding contact portion 56 is always configured to be in liquid-tight contact with the inner wall surface of the cylinder portion 41. Is required to form an ink guide portion 9 having a capillary force between the rear portion of the pen body 24 and the concave portion 6 when the pen is opened to the pen body 24 side.

The recess 6 is a front sliding contact portion 52 of the piston member 5.
And the rear sliding contact portion 56, and there are several types of shapes. For example, a configuration in which an annular concave groove is formed in the sliding contact portion to form the concave portion 6 (see FIG. 4), a configuration in which the concave portion 6 is partially formed in a part of the peripheral surface of the sliding contact portion (see FIG. 5), A configuration (not shown) in which two concave portions 6 provided at opposing positions on the peripheral surface are communicated with each other and a through hole is formed, or a configuration in which two annular projections are disposed and the concave portion 6 is provided therebetween. (See FIG. 6) and the like are appropriately adopted.

The volume of the recess 6 (the depth in the radial direction or the size surrounded by the sliding contact portion) is appropriately set in consideration of the amount of ink held in the pen body 24 and the like.

[0008] The cylinder portion 41 may be formed integrally with the inner wall of the shaft cylinder 2, or may be formed of a cylindrical body formed of a separate member.
It may be configured to be fixed to the inner wall.

The pen body 24 may be any of a heat-sealed fiber and a resin processed body, a felt, and a plastic extruded body having an ink flow passage in the axial direction. It is sufficient that the rear part of the pen body 24 and the piston member 5 are operated integrally when the pen body 24 is operated, and the rear end of the pen body 24 and the front end of the piston member 5 are in contact with each other. Is adopted. In particular, in the configuration in which the pen body 24 comes into contact with the front end of the piston member 5, a ridge 53 or a concave groove 54 may be formed on the front end face of the sliding contact portion in order to efficiently draw out ink at the rear end of the pen body 24.

The sliding contact portion and the inner wall of the cylinder portion 41 always have a circumferential liquid-tight contact portion, that is, at least one of the front sliding portion 52 and the rear sliding contact portion 56. Since the portion is always in liquid-tight contact with the inner wall of the cylinder portion 41, the ink in the ink storage portion 22 does not directly flow out to the pen body 24 at any time during use. Specifically, even when the pen body 24 is pushed in maximum or when the pen body 24 projects maximum, the pushing stroke is set so that the pen body 24 does not directly communicate with the pen body 24, and the recess 6 is formed even in the intermediate operation state in which the sliding contact portion moves. The length of the cylinder portion 41 in the axial direction is set to be larger than the length of the concave portion 6 in the axial direction so that the opening does not simultaneously open to the pen body 24 and the ink storage portion 22.

The ink guiding portion 9 may be formed at least between the rear portion of the pen body 24 and the concave portion 6 when the concave portion 6 opens to the pen body 24 side. For example, a configuration in which a slight gap having a capillary force is formed between the outer periphery of the sliding contact portion in front of the concave portion 6 and the inner wall of the barrel 2 in front of the cylinder portion 41 (see FIG. 1), or the periphery of the sliding contact portion in front of the concave portion 6 Either the surface or the inner wall of the shaft cylinder 2 in front of the cylinder portion 41 may have a configuration in which an axial projection or a slit 91 is provided vertically (see FIG. 6).

[0012]

When the pen member 24 is pressed rearward to retract the piston member 5, the concave portion 6 opens toward the ink storage portion 22, and ink flows into the concave portion 6. At this time, the front sliding contact portion 52 makes liquid-tight contact with the inner wall of the cylinder portion 41 and only the rear sliding contact portion 56 does not contact the inner wall of the cylinder portion 41, so that the inflow ink does not reach the pen body 24. (See Fig. 2)

Next, when the pressing of the pen body 24 is released and the piston member 5 is advanced slightly, the rear sliding portion 56 comes into liquid-tight contact with the inner wall of the cylinder portion 41, and the concave portion 6 blocks communication with the ink storing portion 22. Is done. At this time, since the front sliding contact portion 52 and the inner wall of the cylinder portion 41 also temporarily come into liquid-tight contact, a certain amount of ink is stored in a space formed by the concave portion 6 and the inner wall of the cylinder portion 41. (See Fig. 3)

Thereafter, when the piston member 5 is further advanced, the front sliding contact portion 52 comes into non-contact with the inner wall of the cylinder portion 41, and the concave portion 6 opens to the pen body 24 side. Then, the ink stored in the recess 6 is supplied to the pen body 24. At this time, since the rear sliding contact portion 56 is in liquid-tight contact with the inner wall of the cylinder portion 41, the concave portion 6 does not communicate with the ink storing portion 22. (See Fig. 1)

By providing an ink guiding portion 9 having a capillary force between the rear portion of the pen body 24 and the concave portion 6, the concave portion 6 is provided.
From the ink quickly and reliably. Further, when the ink is filled in the rear portion of the pen body 24, the ink guide portion 9 holds the ink by capillary force and forms a so-called liquid seal, so that the ink supply from the concave portion 6 is suppressed. That is, the pen body 2 generated by repeating the pressing operation
4 can be prevented from being excessively supplied.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
2 shows an embodiment, and FIGS. 2 and 3 show the operation of the embodiment. FIG. 4 shows a main part of the piston member 5 of the embodiment.

The barrel 2 has a tip 21 for holding the pen body 24 in a slidably protruding state, and an ink reservoir 22 at the rear.
Is provided. An ink flow rate adjusting mechanism 3 is mounted between the front end portion 21 and the ink storing portion 22 in the barrel 2.
The pen body 24 is a resin processed body of a polyester fiber bundle (porosity of about 65%). The ink flow rate adjusting mechanism 3
Is a cylinder member 4 provided on the inner wall of the shaft cylinder 2, a holding cylinder 44 for fixing and holding the cylinder member 4 to the inner wall of the shaft cylinder 2, a piston member 5 slidably in contact with the cylinder member 4, and a piston member 5 attached forward. Spring body 8 to be urged, and said spring body 8
And a spring seat 7 fitted to the inner wall of the shaft cylinder 2.

The cylinder member 4 is made of a rubber material. The cylinder portion 41 has a smooth inner wall at the rear, a large-diameter portion 42 slightly larger than the inner diameter of the cylinder portion 41 at the front, and a flange-shaped fitting at the front end. The attachment section 43 is configured. The cylinder member 4 is mounted on the step portion 23 of the inner wall of the tip end portion 21 of the shaft cylinder 2 by the flange-shaped fitting portion 43, and further, the holding cylinder 4
4 and the stepped portion 23 in the axial direction.
The holding cylinder 44 has an inner diameter slightly larger than the outer diameter of the cylinder member 4, and is fitted to the inner wall of the shaft cylinder 2 so as to overlap the cylinder member 4 after assembly. Further, the rear end of the holding cylinder 44 has a projection radially inward, and serves as a stopper with which the flange 58 of the piston member 5 comes into contact.

The spring seat 7 includes a fitting portion 71 having a plurality of cutouts 72 and a cylindrical portion 73 projecting forward and having a center hole 74 formed therethrough. The fitting portion 71 allows the spring seat 7 to be mounted on the inner wall of the barrel 2 without obstructing the flow of ink from the ink reservoir 22.

The piston member 5 includes a front member 51 and a rear member 5.
5, two members. The front member 51 has a front sliding contact portion 52 and is fitted to the rear member 55 by a rod-shaped insertion portion protruding rearward. On the other hand, the rear member 55 has a rear sliding contact portion 56 at a front portion, a reduced diameter portion in front of the rear sliding contact portion 56, and a fitting hole 57 of the insertion portion formed at a front surface. By fitting the 51 and the rear member 55,
An annular recess 6 is formed between the front sliding contact portion 52 and the rear sliding contact portion 56. The concave portion 6 is surrounded by a circumferential sliding contact portion having substantially the same outer diameter, and is connected to the two sliding contact portions by a tapered surface in order to smoothly flow in and out of the ink.

On the front surface of the front member 51 of the piston member 5, three ridges 53 are radially extended, and
In a state in which it is in contact with the rear end, a space is formed for quickly supplying ink to the rear end (see FIG. 4).

Further, the rear member 55 of the piston member 5
A flange 58 having a rear sliding contact portion 56 at the front portion, the spring body 8 is locked at the rear, and a rod portion 59 extending rearward of the flange 58. The flange 58 abuts against the rear end of the holding cylinder 44 on the front surface to prevent forward movement of the piston member 5 by the spring body 8, and the flange 58 is formed with a notch at the abutting portion, thereby storing ink. The ink flow from the section 22 is adjusted. The rod portion 59 is inserted into the center hole 74 of the spring seat 7 to guide the movement of the piston member 5 in the axial direction.

The ink guide 9 will be described (see FIG. 1). When the recess 6 is opened toward the pen body 24, a slight gap having a capillary force is formed between the front sliding contact portion 52 of the piston member 5 and the inner wall of the cylinder member 4 whose diameter is increased at the front. . Thereby, the ink in the concave portion 6 is smoothly led out to the pen body 24, and when the ink is filled in the rear part of the pen body 24, the excessive supply of the ink is prevented by the liquid sealing effect.

FIG. 5 shows another embodiment of the piston member 5. This is an example in which the concave portion 6 is partially provided on the peripheral surface of the sliding contact portion, and the front sliding contact portion 52 and the rear sliding contact portion 56 are continuous sliding contact surfaces. On the front surface, a concave groove 54 is provided in a cross shape, and the pen body 2
4 Form an abutment surface.

FIG. 6 shows another embodiment. A cylinder member 4 made of a plastic molded body is provided
Is fixed. In the cylinder member 4, a plurality of slits 91 are vertically provided as ink guide portions 9 on the inner wall of the front part, and the cylinder part 41 having a smooth surface is formed on the rear part. Two annular elastic bodies are fixed to the front portion of the piston member 5 to form a front sliding contact portion 52 and a rear sliding contact portion 56, and a concave portion 6 is formed therebetween. The other configuration is the same as that of the embodiment of FIG.

[0026]

[Effects of the Invention] Even if the pressing operation is repeated while the pen body holds the ink in a saturated state, the ink is not excessively supplied to the pen body, and the ink in the ink storage unit is not used. Because there is no direct communication with the body, ink does not leak from the pen body. In addition, it is possible to reliably supply a fixed amount of ink to the pen body without variation in the amount of ink spilled by the operation method, which satisfies practicality as a simple writing instrument.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of an embodiment of the liquid writing instrument of the present invention.

FIG. 2 is a longitudinal sectional view of a main part when the pen body is pressed according to the embodiment.

FIG. 3 is a vertical sectional view of a main part showing an operation state of the embodiment.

FIG. 4 is a perspective view of a main part of the piston member of the embodiment.

FIG. 5 is a perspective view of a main part showing another embodiment of the piston member.

FIG. 6 is a longitudinal sectional view of a main part of another embodiment of the liquid writing implement of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid writing implement 2 Shaft cylinder 21 Tip part 22 Ink storing part 23 Step part 24 Pen body 3 Ink flow control mechanism 4 Cylinder member 41 Cylinder part 42 Enlarged diameter part 43 Flange fitting part 44 Holding cylinder 5 Piston member 51 Front member 52 Front sliding contact part 53 Convex ridge 54 Depressed groove 55 Rear member 56 Rear sliding contact part 57 Fitting hole 58 Flange part 59 Bar-shaped part 6 Concave part 7 Spring seat 71 Fitting part 72 Notch 73 Cylindrical part 74 Center hole 8 Spring Body 9 Ink guide section 91 Slit

Claims (2)

(57) [Scope of request for utility model registration] An ink flow rate adjusting mechanism is interposed between an ink reservoir and a pen body, and the pen mechanism urged forward is pressed rearward to operate the adjusting mechanism. In a liquid writing implement of a type for supplying ink to the body, a piston member 5 which operates integrally with the pen body 24 and has a circumferential sliding contact portion on the outer surface in a front portion of the barrel 2;
The sliding portion is provided with a cylinder portion 41 that makes liquid-tight contact, and a small ink storage gap is formed between the piston member 5 and the inner wall surface of the cylinder portion 41 at a substantially intermediate position in the axial direction of the sliding portion. A concave portion 6 to be formed is provided, and a front sliding contact portion 52 and a rear sliding contact portion 56 are formed with the concave portion 6 interposed therebetween. The portion 56 comes into non-contact with the inner wall surface of the cylinder portion 41, while the piston member 5
As a result, the front sliding contact portion 52 is brought into a non-contact state with the inner wall surface of the cylinder portion 41, and at least one of the front sliding contact portion 52 and the rear sliding contact portion 56 is always liquid-tight with the inner wall surface of the cylinder portion 41. A liquid writing implement 1 configured to contact. 2. The liquid writing implement 1 according to claim 1, wherein an ink guiding portion 9 having a capillary force is formed between a rear portion of the pen body 24 and the recess 6 when the recess 6 is opened to the pen body 24 side. .