JP2003341276A - Coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein, since the inner diameter of an O-ring is larger than the outer diameter of the intermediate part of a piston, the attitude of the O-ring is hardly stabilized, and when the piston is axially moved and pressurized, the O-ring axially moves, but the O-ring is then twisted or distorted so that air is resultantly leaked with the result that the pressurization is not surely conducted. <P>SOLUTION: A coater comprises a liquid contained in a barrel body, a pressurizing means for pressurizing the liquid disposed at the rear of the body, a back-flow inhibitor moving in association with a decrease in the liquid and disposed at the rear of the liquid, a first valve mechanism disposed between the inhibitor and the pressurizing means, and a second valve mechanism disposed at the pressurizing means. In this coater, the second valve mechanism includes an annular member slidably disposed at the piston, and a through hole formed at the piston and opened or closed by the sliding annular member. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to coating having a pressurizing means for pressurizing a liquid chamber containing a liquid, and examples of the applicator include makeup tools such as eyeliner and manicure, ballpoint pens and the like. Writing instruments and correction tools are listed.

[0002]

2. Description of the Related Art As an example of the prior art, Japanese Patent Laid-Open No. 10-2
No. 8921 will be described. A cylinder chamber is provided in the rear portion of the main body that stores the liquid agent, and a piston is slidably arranged in the cylinder chamber. Also,
A check valve, which is biased rearward by a coil spring, is arranged in a front portion of the cylinder chamber, and a portion in front of the check valve serves as a liquid agent storage portion. An O-ring is slidably inserted in the piston axial direction at a small-diameter intermediate portion between the large-diameter base portion of the piston and the head portion in which the air passage is formed, and the piston is moved forward. By doing so, the annular step portion of the piston comes into close contact with the side surface of the O-ring, and it is possible to pressurize the air in the cylinder chamber. Then, the check valve is opened by the applied pressure, and when the pressurized air is sent to the liquid agent storage unit, the liquid agent in the liquid agent storage unit is pressurized. Further, when the piston is retracted, the annular step portion of the piston becomes O.
The head part comes into contact with the O-ring when separated from the ring. As a result, the ventilation passage is opened and the outside air flows into the cylinder.

[0003]

The above-mentioned conventional technique has an advantage that outside air can flow into the cylinder when the piston is retracted. However, since the inner diameter of the O-ring is larger than the outer diameter of the middle portion of the piston, it is difficult to stabilize the posture of the O-ring. That is, when the piston is moved in the axial direction and pressurized, the O-ring also moves in the axial direction, but at this time, the O-ring is twisted or distorted.
As a result, the air leaks and the pressurization is not reliably performed.

[0004]

The present invention has been made in view of the above problems, and a liquid is contained in the shaft main body,
Further, a pressurizing means for pressurizing the liquid is disposed behind the shaft main body, and a backflow preventive body that moves with the decrease of the liquid is disposed behind the liquid, and the backflow preventive body and the backflow preventive body are provided. An applicator in which a first valve mechanism is disposed between the pressurizing means and a second valve mechanism is disposed in the pressurizing means, and the second valve mechanism is slidable on a piston. The gist of the invention is that it is configured by an annular member arranged and a through hole formed in the piston that opens and closes by the sliding annular member.

[0005]

According to the present invention, due to the above construction, the annular member is prevented from being twisted or distorted when the piston slides, and is corrected.

[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 liquid 4 is directly contained inside the front shaft 2. That is, front shaft 2
It itself is a container for the liquid 4. Further, a tapered tip portion 5 is formed at the front end portion of the front shaft 2,
A ballpoint pen tip 6 is press-fitted and fixed to the front end of the tip portion 5. 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. The tip opening 9 is closed. Then, when the ball 7 of the ball-point pen tip 6 is brought into contact with the application surface or the like, the contact force causes the ball 7 to retreat and the tip opening portion 9 to be released, so that the liquid in the 2 is rotated with the rotation of the ball 7. Discharge.
Further, three ribs 11 are extended at equal intervals behind the ink passage 10 of the ball-point pen tip 6 to which the elastic member 8 is attached, and the rear end portions thereof are circular connecting portions 12.
However, the ribs 11 may be connected at an intermediate portion.

At the rear end of the liquid 4, two kinds of grease 13 (water-based grease 13a and oil-based grease 13b) for preventing the liquid 4 from flowing out from the rear of the liquid 2 are interposed. Is embedded with a float 14 made of synthetic resin. The outer diameter of the float 14 is formed slightly smaller than the inner diameter of the float 2. The grease 1
3 is always interposed in the gap between the front shaft 2 and the float 14. The float 14 is used when the liquid 4 and the grease 13 contained therein have a relatively high viscosity,
It is not always necessary even when the inner diameter of the front shaft 2 is relatively small. Also, these grease 13 and float 1
No. 4 moves forward with the decrease of the liquid. Code 15
Is a cap detachably attached to the front end of the front shaft 2, and a clip 16 is integrally molded with the cap 15, but it is constituted by a separate member and fixed to the cap by means such as press fitting. You may.

A piston member 18 biased rearward by an elastic member 17 such as a coil spring is slidably arranged inside the rear shaft 3. The piston member 18 has a lower part that is inserted into the rear shaft 3 from the middle part thereof, and the part where the piston member 18 is inserted has a clearance that prevents rattling as much as possible while ensuring sufficient air circulation. is doing. A sliding groove 19 is formed in the middle of the piston member 18, and an annular O-ring 20 made of an elastic member is fitted in the sliding groove 19. The O-ring 20 serves as a valve mechanism (second valve mechanism). The O-ring 20 has an outer diameter that is slightly larger than the inner diameter of the rear shaft 3, so that the O-ring 20 and the rear shaft 3 have a larger diameter.
It is in close contact with the inner surface of the. Also, the O-ring 20
The inner diameter of is smaller than the outer diameter of the sliding groove 19 of the piston member 18. The sliding groove 19 is O
The O-ring 20 has a groove width (front-back direction) longer than the wire diameter of the ring 20, and the inserted O-ring 20 has its sliding groove 19
The range from the front part 21 to the rear part 22 is slidable. That is, the front part 21 which is the most advanced position of the O-ring 20 contacts the front step part 21a, and the rear part 22 which is the most retracted position contacts the rear step part 22a. Further, the rear portion 22 is provided with a communication hole 23 that communicates with the inner side of the piston member 18, so that air can flow. In addition, the piston member 18 in the normal state
In the rearmost retracted position, the O-ring 20 slides in the sliding groove 1
It is located at the front portion 21 of the rear shaft 9, and the inside and the outside of the rear shaft 3 communicate with each other through the communication hole 23.

A pressing portion 2 is provided at the rear of the piston member 18.
4 is integrally formed and protrudes from the rear end portion of the rear shaft 3, but the piston member and the pressing portion may be formed as separate members and fixed by means such as press fitting. In addition, a slit 25 is formed at a position facing the rear portion of the rear shaft 3, and an elastic protrusion 26 fitted into the slit 25 is formed.
Is formed on the outer surface of the piston member 18. The elastic protrusion 26 is formed by forming a U-shaped slit on the side surface of the piston member 18. The fitting and engagement of these members prevents the piston member 18 from protruding from the rear shaft 3.
Reference numeral 27 is a circumferential flange that prevents the piston member 18 from being excessively depressed during the pressing operation.

An intermediate portion of the rear shaft 3 and the rear shaft 2
A first valve mechanism 28 made of a rubber-like elastic body is arranged at the rear portion. The first valve mechanism 28 is a tubular body 30 having a reduced diameter bottom portion 29, but a slit 31 is formed in the bottom portion 29. A flange 32 is formed on the outer surface of the rear portion of the tubular body 30 and is in contact with the circumferential step formed on the inner surface of the rear shaft 3, but is urged by the piston member 18. The end portion of the elastic member 17 is pressed against the circumferential stepped portion through the fixing ring 33 and is fixed to the rear shaft 3.
The first valve mechanism 28 forms the tubular body 30 whose diameter is gradually reduced, so that the slit 31 easily expands with respect to the pressure from the direction of the tubular body 30, and from the opposite direction. It has a structure that does not easily expand against pressure.
That is, by making the area of the portion that receives the pressure small, it is difficult to deform. By arranging the first valve mechanism 28 at the intermediate portion of the rear shaft 3, and by arranging the O-ring 20 serving as the second valve mechanism at the intermediate portion of the piston member 18, the rear shaft 3 is formed. Although two chambers are formed inside, the chamber formed between the first valve mechanism and the second valve mechanism is called the pressurizing chamber 34, and the chamber formed in front of the first valve mechanism is referred to as the pressurizing chamber 34. It is called the pressure holding chamber 35. Reference numeral 36 denotes a hemispherical cover portion formed so as to cover the first valve mechanism 28, and the front end portion of the cover portion 36 has a through hole 37 having a diameter smaller than the outer diameter of the ballpoint pen tip 6. A tubular portion 38 in which is formed is formed. That is, the cover portion 36 protects the first valve mechanism 28 and prevents the leaked grease 13 and liquid 4 from moving backward. That is, the vicinity of the outer periphery of the cover portion 36 also serves as a liquid reservoir. By the way, such liquid leakage is likely to occur when an impact is applied such as dropping the applicator upside down. Here, examples of the material of the elastic member constituting the first valve mechanism and the second valve mechanism include nitrile rubber, styrene butadiene rubber, silicone rubber, fluororubber, butyl rubber and the like.

Next, the usage (operation) of the first embodiment will be described. FIG. 1 is a view showing a normal state, in which the piston member 18 is biased rearward by an elastic member 17.
At this time, the O-ring 20 has a front portion 21 of the sliding groove 19.
Therefore, the pressurizing chamber 34 is
Is in communication with the outside air. When the pressing portion 24 is pressed from the state of FIG. 1, the piston member 18 advances, but at the time of initial advance, the O-ring 20 does not receive the force from the piston member 18, so the O-ring 20 remains stationary. Is kept. Therefore, the pressurizing chamber 34 remains in communication with the outside air through the communication hole 23.
When the piston member 18 further advances, the rear portion 22
The rear step portion 22a of the abutting member abuts the O-ring 20, whereby the piston member 18 advances together with the O-ring 20. At this time, the O-ring 20 is kept in close contact with the inner surface of the rear shaft 3, and is also in close contact with the rear step portion 22a. As a result, the communication hole 23 is shut off from the outside air, and the forward movement of the piston member 18 pressurizes the pressurizing chamber 34.

Pressurization of the pressurizing chamber 34 is started as the piston member 18 advances, and when the pressure in the pressurizing chamber 34 increases, the slit 31 of the first valve mechanism 28 expands and is pressurized. The air moves into the pressure holding chamber 35. Due to this movement, the pressure in the pressure holding chamber 35 also increases, and as a result, the float 14 moves forward together with the grease 13 and the liquid 4 is pressurized. That is, with air in contact with the liquid,
Instead of pressurizing the liquid, the liquid is pressurized with the float or grease in contact with the liquid. When the ball 7 is pressed against the writing surface or the like in this pressurized state, the tip end opening 9 is opened and ink is ejected. At this time, the ink is applied to the opening 12 of the circular connecting portion 12.
The gap 11a between the adjacent ribs 11 while flowing in from a
From each other, and at this time, they collide with each other, are mixed and stirred, and move toward the tip opening 9.

Here, when the pressing operation of the pressing portion 24 is released, the piston member 18 starts to retreat. At that time, at the time of initial retreat, the O-ring 20 receives a small retreating force from the piston member 18, so the O-ring 20 remains stationary, and as a result, the O-ring 20 and the rear step portion 22a come into contact with each other. Is released, the communication hole 23 is communicated with the outside air, and the pressurizing chamber 34 is also communicated with the outside air. Due to this communication with the outside air, the pressure chamber 34 has the same atmospheric pressure as the outside air. That is, the decompression of the pressurizing chamber 34 due to the retreat of the piston member 18 is prevented. by this,
The piston member can be smoothly retracted. Then, when the piston member 18 further retracts, the front step portion 21a of the front portion 21 contacts the O-ring 20, and the O-ring 20 also retracts together with the piston member 18 and returns to the normal state. still,
In order to smoothly release the contact between the O-ring 20 and the front step portion 21a during the initial forward movement, and to release the contact between the O ring 20 and the rear step portion 22a during the initial backward movement,
It is necessary to appropriately set the sliding resistance between the inner surface of the rear shaft 3 and the O-ring 20 and the sliding resistance between the O-ring 20 and the sliding groove 19, but this is possible. As described above, since the O-ring 20 is constantly receiving the force from the inner surface of the rear shaft 3 and the sliding groove 19, the posture of the O-ring is always corrected, and as a result, the twist and the distortion are generated. It's getting harder.

FIG. 7 shows a modification of the first embodiment. The sliding groove 19 has a tapered shape, and the outer diameter of the rear portion 22 is larger than the inner diameter of the O-ring 20, but the outer diameter of the front portion 21 is smaller than the inner diameter of the O-ring 20. (See FIG. 7). According to this modification, since the O-ring 20 is located in the front portion 21 of the sliding groove 19 in the process from the release of the pressing operation to the normal state (the outer diameter of the front portion 21 is smaller than that of the O-ring 20). (Because the diameter is smaller than the inner diameter) Twisting and distortion are likely to occur. However, in the pressing operation during use, when the piston member 18 moves forward, the posture of the O-ring 20 is corrected while being expanded from the sliding groove along the taper portion of the sliding groove 19, so that twisting or distortion occurs. It is eliminated and reliable pressurization operation becomes possible. With the configuration of this modification, in the normal state, the O-ring 20 has the sliding groove 19
The O-ring 20 is also not affected by the expansion force from the above, so that there is also an effect that deterioration such as deformation with time is suppressed.

8 to 11 show a second embodiment of the present invention. The description of the same configuration as that of the first embodiment will be omitted. Behind the rear shaft 3, a piston member 18 biased rearward by an elastic member 17 such as a coil spring.
Are slidably arranged. A swing groove 39 is formed in the middle of the piston member 18. This swing groove 3
An O-ring 20, which is an annular member, is fitted and inserted in 9.
The swing groove 39 is formed in a circumferential shape of the piston member 18, but has a minimum groove width portion 40 that is substantially the same as the O-ring 20 at an arbitrary position, and has a maximum groove width at an opposing position. It is a part 41. The minimum groove width portion 40 and the maximum groove width portion 41 are smoothly and continuously formed by the intermediate portion 42. In addition, a communication hole 23 that communicates with the inside of the piston member 18 is formed in the intermediate portion 42, and air can flow therethrough. The O-ring 20 can swing about the swing groove 39 with the minimum groove width portion 40 as a fulcrum, and like the first embodiment, from the front step portion 21a of the front portion 21 to the rear portion 22. Rocks within the range up to the rear step portion 22a.

Next, the method of use (operation) will be described.
FIG. 8 is a view showing a normal state, in which the piston member 18
Are urged rearward by the elastic member 17. At this time, the O-ring 20 is located at the front portion 21 of the swing groove 39, and the pressurizing chamber 34 is in communication with the outside air through the communication hole 23. When the pressing portion 24 is pressed from the state of FIG. 8, the O-ring 20 moves forward with the piston member 18 and the O-ring 20 has the maximum groove width portion 41 with the minimum groove width portion 40 as a fulcrum.
And swings to the rear part 22 of the intermediate part 42 to form the rear step part 22a.
Abut. At this time, the O-ring 20 is kept in close contact with the inner surface of the rear shaft 3 and is also in close contact with the rear step portion 22a. Therefore, the communication hole 23 is blocked from the outside air, and the forward movement of the piston member 18 pressurizes the pressurizing chamber. And the first
As in the embodiment, the liquid 4 can be ejected.

When the pressing operation of the pressing portion 24 is released,
As the piston member 18 starts to retreat, the O-ring 20 swings to the maximum groove width portion 41 and the front portion 21 of the intermediate portion 42 with the minimum groove width portion 40 as a fulcrum, and contacts the front step portion 21a. At this time, the communication hole 23 is communicated with the outside air, and the pressurizing chamber 34 is communicated with the outside air, so that the piston member can be smoothly retracted. That is, the pressure reducing action in the pressure chamber 34 due to the retreat of the piston member is prevented as much as possible.

[0018]

According to the present invention, a liquid is contained in the shaft body,
Further, a pressurizing means for pressurizing the liquid is disposed behind the shaft main body, and a backflow preventive body that moves with the decrease of the liquid is disposed behind the liquid, and the backflow preventive body and the backflow preventive body are provided. An applicator in which a first valve mechanism is disposed between the pressurizing means and a second valve mechanism is disposed in the pressurizing means, and the second valve mechanism is slidable on a piston. Since it is composed of the arranged annular member and the through hole formed in the piston that is opened and closed by the sliding annular member, the annular member is prevented from being twisted or distorted when the piston slides, and air leakage does not occur. As a result, a reliable pressurizing operation can be performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a normal state of a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of FIG.

FIG. 3 is a longitudinal sectional view of a main part of FIG.

FIG. 4 is an external perspective view of an essential part of FIG.

FIG. 5 is a perspective view showing a first valve mechanism.

FIG. 6 is a vertical sectional view for explaining the operation.

FIG. 7 is a longitudinal sectional view of a main part showing a modified example of the first embodiment.

FIG. 8 is a vertical sectional view showing a normal state of a second embodiment of the present invention.

9 is a vertical cross-sectional view of the main part of FIG.

FIG. 10 is an external view of a piston member.

FIG. 11 is a vertical sectional view for explaining the operation.

[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 ink passage 11 ribs 12 circular connecting part 13 grease 14 float 15 caps 16 clips 17 Repellent material 18 Piston member 19 Sliding groove 20 O-ring 21 front part 21a front step 22 Rear 22a Rear step 23 communication holes 24 Pressing part 25 slits 26 Elastic protrusion 27 collar part 28 First valve mechanism 29 bottom 30 tubular 31 slits 32 Collar 33 fixing ring 34 Pressurizing chamber 35 Pressure holding chamber 36 Cover 37 Through hole 38 Cylindrical part 39 Swing groove 40 minimum groove width 41 Maximum groove width 42 Middle part

Claims (2)

[Claims] 1. A liquid is accommodated in the shaft body, and a pressurizing means for pressurizing the liquid is arranged at the rear of the shaft body, and is moved to a rear portion of the liquid as the liquid decreases. An applicator in which a backflow prevention body is arranged, a first valve mechanism is arranged between the backflow prevention body and the pressurizing means, and a second valve mechanism is arranged in the pressurizing means. An applicator characterized in that the second valve mechanism is constituted by an annular member slidably arranged on the piston and a through hole formed in the piston opened and closed by the sliding annular member. 2. The annular member is arranged in an annular recess formed in a piston, the annular recess is formed in a conical shape, and the through hole is formed in the maximum diameter part of the conical annular recess. The applicator according to claim 1, wherein: