JP2003039876A - Applicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the conventional problem that when a pressurizing mechanism (a cylinder member) and a coating fluid tank are separated from each other, a blocking body made of a silicone rubber is exposed and impaired by an inadvertent operation, for example, injuring the blocking body by an impact caused when it is brought into contact with a desk surface or hurting the blocking body by the tip of the coating fluid tank to be replaced and that the pressurizing force is whittled away and consequently the stable discharge of the fluid is not obtained, when the applicator with the impaired blocking body is used. SOLUTION: This applicator is of such a construction that a replaceable ink reservoir is arranged forward of the pressurizing mechanism with a valve which can be opened and closed and a coating part is arranged at the forward end of the ink reservoir. The valve is wrapped with a cover member of a harder material than that of the valve and a through hole is formed in the cover member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an applicator in which a replaceable ink container is arranged in front of a pressurizing mechanism having a valve that can be opened and closed, and an application section is arranged at the front end of the ink container.

[0002]

2. Description of the Related Art As a conventional technique in which a pressurizing mechanism having an openable / closable valve is arranged behind a barrel, Japanese Patent Laid-Open No. 2000-30
No. 9193 is known. According to the invention, "a spherical applicator is rotatably held in a state where a part thereof is exposed from the tip of the tip, and the spherical applicator is elastically urged by a spring to be attached to an inward tip edge of the tip. A small diameter part at the tip of the applicator, which is in contact with the chip and is connected to a coating liquid tank filled with a film-forming coating liquid having high viscosity, at the tail end of the coating liquid tank injection-molded with a hard synthetic resin. A cylindrical cylinder member with a bottom having a ventilation hole in the radial direction is arranged in the outer peripheral surface of the small diameter portion projecting into the coating liquid tank, and a closing member made of a soft elastic body for closing the ventilation hole is fitted into the outer peripheral surface of the small diameter portion. Rarely, a piston member having an axial through hole formed therein is arranged in the cylinder member in a state of being elastically bulged in the tail end direction by a spring, and on the outer peripheral surface of the tip end portion of the piston member,
An upper O-ring and a lower O-ring that slide in an airtight manner are fitted to the inner peripheral surface of the cylinder member, and a space between the upper O-ring and the lower O-ring is filled with a grease-like sealant, which is penetrated by a fingertip. When the piston member is moved forward with the hole blocked, the air in the pressurized cylinder member expands the blocker and enters the coating solution tank through the ventilation hole, and the inside of the coating solution tank is heated. An applicator characterized by being pressed. Is the gist. That is, by pressing the piston member, the inside of the coating liquid tank is pressurized and the coating liquid is discharged.

[0003]

In the above-mentioned prior art, since the inside of the tank is pressurized and discharged, stable discharge can be obtained. By the way, in recent years, recycling has become active because of resource saving. The above-mentioned applicator is no exception, and the applicator tank has come to be replaceable. That is, the pressurizing mechanism at the rear part and the coating liquid tank can be attached and detached. Also in the above example, the cylinder member and the coating liquid tank are fixed by screwing,
It is removable. However, in the above-mentioned conventional technique, when the pressurizing mechanism (cylinder member) and the coating liquid tank are separated, the closing body made of silicon rubber is exposed, and the closing body may be damaged by an accidental operation. there were. For example, it may come into contact with the top surface of a desk and be scratched by the impact, or the tip of the coating solution tank to be replaced may be scratched. If the occluder is used with scratches, the pressure is weakened and stable ejection cannot be obtained.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, in which a replaceable ink container is arranged in front of a pressurizing mechanism having an openable / closable valve, and the ink container is formed. An applicator in which an applicator is disposed at the front end of the valve, while covering the valve with a cover member that is harder than the valve,
The gist is that a through hole is formed in the cover member.

[0005]

The function of the cover member is to prevent external force such as impact on the valve.

[0006]

EXAMPLE A first example will be described with reference to FIGS. The shaft body 1 includes a front shaft 2 and a rear shaft 3, which are detachably connected by screwing. The screw structure will be described later in detail. The liquid 4 is directly contained inside the front shaft 2. That is, the front shaft 2 itself serves as a container for the liquid 4. Further, a tapered tip portion 5 is formed at the front end portion of the front shaft 2, and a ballpoint pen tip 6 is press-fitted and fixed to the front end of the tip portion 5. And
A ball 7 is rotatably attached to the front end of the ball-point pen tip 6, but is always urged forward by an elastic member 8 such as a coil spring, and the tip end opening of the ball-point pen tip 6 is always present. It is blocking part 9.
Then, when the ball 7 of the ball-point pen tip 6 is brought into contact with the coating surface or the like, the contact force causes the ball 7 to retract,
When the tip opening 9 is released, the liquid in the front shaft 2 is discharged as the ball 7 rotates. By the way, the rear end of the elastic member 8 is a rib 2 formed on the front inner surface of the front shaft 2.
It is in contact with and is seated on a. Specifically, the rib 2a is seated at the substantially central portion (see FIG. 2). In order to improve the flowability of the liquid, a sufficient flow passage is secured.

At the rear end of the liquid 4, two kinds of grease 10 (water-based grease 10a and oil-based grease 10b) for preventing the liquid 4 from flowing out from the rear portion of the front shaft 2 are interposed. A float 11 made of synthetic resin is buried in the. The float 11 is not always necessary when the viscosity of the liquid 4 or the grease 10 contained therein is relatively high, or when the inner diameter of the refill 2 is relatively small. Furthermore, when the float 11 is inscribed in the front shaft 2 with a certain amount of pressure input, grease is not always necessary. As will be described later, the grease 10 and the float 11 advance as the amount of liquid decreases. Reference numeral 12 is a cap detachably attached to the front end of the front shaft 2, and the clip 12 is integrally molded with the cap 12, but is formed of a separate member.
It may be fixed to the cap by means such as press fitting.

Inside the rear portion of the rear shaft 3, a piston member 15 biased rearward by an elastic member 14 such as a coil spring is slidably arranged. The O-ring 16 made of an elastic member press-fitted into the middle portion of the is a sliding portion with the inner surface of the rear shaft 3, but is replaced with the O-ring 16 and the piston member 15
A circumferential projection or the like may be integrally formed on the outer peripheral surface of the. Also,
A pressing portion 17 is integrally formed at the rear portion of the piston member 15 and protrudes from the rear end portion of the rear shaft 3, but the piston member and the pressing portion are formed as separate members, and press fitting or the like is performed. It may be fixed by means. Further, the rear shaft 3
A vertical groove 18 is formed on the inner surface of the rear portion, and in the normal state (the final retracted position of the pressing member 17), the O-ring 16 of the piston member 15 is located at the intermediate portion of the vertical groove 18. That is, in the normal state, the vertical groove 18 allows the inside and the outside of the rear shaft 3 to communicate with each other. A slit 19 is formed in the rear portion of the rear shaft 3 at a position facing each other, and an elastic projection 20 fitted in the slit 19 is formed on the outer surface of the piston member 15. The elastic protrusion 20 is formed by forming a U-shaped slit 21 on the side surface of the piston member 15 (see FIG. 3). And these are in,
By engaging, the protrusion of the piston member 15 from the rear shaft 3 is prevented. Reference numeral 21 is a circumferential flange that prevents the piston member 15 from being excessively retracted during the pressing operation.

A valve mechanism 22 made of a rubber-like elastic body is arranged at the intermediate portion of the rear shaft 3 and at the rear portion of the front shaft 2. The valve mechanism 22 has a reduced diameter bottom portion 2.
3 is a cylindrical body 24 having slits 25 formed in the bottom portion 23. A flange portion 26 is formed on the outer surface of the rear portion of the tubular body 24 (see FIG. 4), which is in contact with the circumferential step portion 3a formed on the inner surface of the rear shaft 3, but the piston The end of the elastic member 14 that urges the member 15 is pressed against the circumferential stepped portion 3 a via the fixing ring 27 and is fixed to the rear shaft 3. The valve mechanism 22 forms the cylindrical body 24 having a gradually reduced diameter, so that the slit 25 easily expands with respect to the pressure from the direction of the cylindrical body 24 and the pressure from the opposite direction. However, it has a structure that is difficult to expand. That is, by making the area of the portion that receives the pressure small, it is difficult to deform. By arranging the valve mechanism 22 in the intermediate portion of the rear shaft 3, two chambers are formed in the rear shaft 3, but the chamber formed behind the valve mechanism 22 is referred to as the pressurizing chamber 28. The chamber formed at the front is referred to as a pressure holding chamber 29.

Next, the connecting means for connecting the front shaft 2 and the rear shaft 3 will be described in detail. A male screw portion 30 having a trapezoidal cross section is formed at the rear portion of the front shaft 2. On the other hand, in the front part of the rear shaft 3, a female screw part 31 having a mountain-shaped cross section is formed. A semicircular arc cover 32 is formed on the inner surface of the rear shaft 3 at the rear of the female screw 31 so as to cover the valve mechanism 22. And
At the front end of the cover 32, the chip holder 6
A cylindrical portion 34 in which a through hole 33 having a diameter smaller than the outer diameter of
Are formed. In other words, the cover portion 32 protects the valve mechanism 22 and prevents the leaked grease 10 and liquid 4 from moving backward. That is, the vicinity of the bottom of the pressurizing chamber 29 also serves as a liquid reservoir. By the way, such ink leakage is likely to occur when a shock is applied, such as dropping the applicator upside down. Although the number of the through hole 34 is one in this example, a plurality of through holes 34 may be formed. The flowability of air is improved, and the pressurizing operation becomes easy.

Here, as specific examples of the water-based grease 10a, water, ethylene glycol, glycerin, etc. may be mentioned, but they may be thickened with a thickener. Specific examples of the oil grease 10b include silicone, liquid paraffin, polybutene, and alpha-olefin which are gelled or thickened with a gelling agent or a thickener as a general material. Furthermore, examples of the material of the valve mechanism formed of the rubber-like elastic body include nitrile rubber, styrene butadiene rubber, silicone rubber, fluororubber and butyl rubber. Further, as the material of the front shaft 2, a metal material such as stainless steel or brass,
Examples of the material include resin materials such as polybutylene terephthalate, fluorine, and nylon, or those obtained by subjecting the surface of nylon to aluminum vapor deposition or silicon oxide vapor deposition, and those obtained by mixing aluminum powder or glass powder into the resin.

Next, the operation will be described. Pressing part 17
When is pressed against the elastic force of the elastic member 14, the piston member 15 is linearly advanced while being guided by the slit 19. Also, in the forward movement process of the piston member 15, the O-ring 16 passes through the vertical groove 18, but from this time, the pressurizing chamber 2
Pressurization of 8 is started. Then, when the pressure in the pressurizing chamber 28 increases to some extent, the slit 25 of the valve mechanism 22 expands and the pressurized air moves into the pressure holding chamber 29.
Due to this movement, the pressure in the pressure holding chamber 29 also increases, and as a result, the float 11 moves forward together with the grease 10 and the liquid 4 is pressurized. That is, the liquid is not pressurized while the air is in contact with the liquid, but is pressurized while the float or grease is in contact with the liquid.

Here, when the pressing operation of the pressing portion 17 is released, the piston member 15 returns. When the O-ring 16 of the piston member 15 reaches the vertical groove 18 of the rear shaft 3 in the returning process. Since the pressurizing chamber 28 communicates with the outside, new air enters the pressurizing chamber 28 and the depressurized state in the pressurizing chamber 28 is canceled. In this way, in this example, since the piston member can be moved forward (backward) by a fixed amount, the pressure applied to the pressure holding chamber can also be increased by a fixed amount. In addition, since the valve mechanism 22 is made of a deformable rubber-like elastic body, when excessive pressure is applied to the pressure holding chamber 29, the slit 25 of the valve member 22 expands after the piston member returns. When opened, excess pressure is returned to the pressurizing chamber 28 and is discharged from the vertical groove 18.

Here, when the liquid 4 is used up, the front shaft 2 is rotated relative to the rear shaft 3 to separate the front shaft 2 and the rear shaft 3. Then, the new front shaft 2 supplemented with the liquid is screwed and connected to the rear shaft 3. At this time, even if the tip holder 6 is accidentally pierced into the valve mechanism 22, the through hole 33 of the cover portion 34 is formed to have a smaller diameter than the tip holder 6, so that it does not reach the valve mechanism 22. It does not damage the valve mechanism. Further, even if the rear shaft 3 is dropped during replacement, the valve mechanism 22 is protected by the cover portion 32.
It won't get scratched.

A second example will be described with reference to FIG. Cover part 3
5 is an example in which 5 is formed long. More specifically, the distance from the tip of the valve mechanism 22 to the cover portion 35 is formed longer than the length of the tip holder 6. The through hole 36 has a diameter larger than the outer diameter of the chip holder 6, but smaller than the outer diameter of the tip portion 5. That is, even if the tip holder 6 is accidentally pierced into the through hole 36 when the front shaft 2 is replaced, the tip (ball 7) of the tip holder 6 does not reach the valve mechanism 22.

[0016]

The present invention relates to an applicator in which a replaceable ink container is arranged in front of a pressurizing mechanism having an openable / closable valve, and an application part is arranged at the front end of the ink container. While covering the valve with a cover member harder than the valve,
Since the through hole is formed in the cover member, it is possible to provide an applicator that can obtain stable discharge for a long period of time without damaging the valve.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first example of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 is an external perspective view of the main part of FIG.

FIG. 4 is a perspective view showing a valve mechanism.

FIG. 5 is a longitudinal sectional view of a main part showing a modified example of a cover part.

[Explanation of symbols]

1-axis body 2 front axis 3 rear axle 4 liquid 5 front 6 ballpoint pen tip 7 balls 8 Repulsion member 9 Tip opening 10 grease 11 floats 12 caps 13 clips 14 Repulsion member 15 Piston member 16 O-ring 17 Pressing member 18 vertical groove 19 slits 20 elastic protrusions 21 Collar 22 Valve member 23 bottom 24 tubular part 25 slits 26 collar part 27 fixing ring 28 Pressurization chamber 29 Pressure holding chamber 29 caps 30 Male thread 31 Female thread 32 cover 33 through holes 34 Cylindrical part 35 cover 36 through holes

Claims (3)

[Claims] 1. An applicator in which a replaceable ink container is arranged in front of a pressurizing mechanism having an openable and closable valve, and an applicator is arranged at a front end of the ink container, wherein the valve is a valve. An applicator characterized in that it is covered with a harder cover member, and a through hole is formed in the cover member. 2. A coating portion having a diameter smaller than that of the ink container is arranged at a front end of the ink container, and an inner diameter of a through hole of the cover member is smaller than an outer diameter of the coating portion. Item 1. The applicator according to item 1. 3. The applicator according to claim 1, wherein the distance from the valve tip to the cover member tip is longer than the length of the application section.