JP5729174B2 - Applicator - Google Patents

Description

  The present invention has a pen tip and a shaft tube connected to the rear end of the pen tip, and accommodates the coating liquid and the slide stopper that advances in close contact with the rear end interface of the coating solution in the shaft tube. It is related with the applied applicator.

  Conventionally, there are applicators that perform writing by substituting the coating liquid with air. However, the increase in internal pressure due to temperature rise and leakage of the coating liquid are regarded as problems. As a workaround, a slide plug is placed in the shaft tube. Many applicators configured such that air does not exist in the coating liquid container by advancing the slide stopper as the coating liquid is consumed have been disclosed (see Patent Document 1).

In addition, many pressure-type writing instruments that provide discharge support by applying pressure to the slide plug and the coating liquid by providing a pressure system behind the slide plug are also disclosed (see Patent Document 2).

JP-A 64-5897 Japanese Patent No. 4131794

Patent Document 1 is a direct liquid type writing instrument having an ink cylinder and a slide stopper that moves forward as the ink is consumed while maintaining the sealed state of the ink. When the slide stopper is inserted from the rear end opening of the ink cylinder in a state filled with the air, the air in the ink cylinder is sealed and compressed between the ink and the slide stopper, and the slide stopper is moved backward. I try to push back. Therefore, it is difficult to insert the slide stopper until it comes into close contact with the rear end interface of the ink.

Patent Document 2 discloses a compressible ink driving member (slide of the present invention) that has a sufficiently large diameter so as to be deformed and adapted to the writing medium and the inner surface of the ink tube in the ink tube. A pressure-type writing instrument provided with a pressure system, and the inner surface of the ink tube is tapered from the rear end toward the front end. Therefore, the ink driving member and the ink tube inner surface start to come in contact further rearward than the rear end interface of the writing medium. That is, in the ink tube, air is sealed between the writing medium and the ink driving member, and the air is compressed and tries to push back the ink driving member. For this reason, it is difficult to insert the ink driving member until the ink driving member comes into close contact with the rear end interface of the writing medium.

  The present invention has a pen tip and a shaft tube connected to the rear end of the pen tip, and is disposed in the shaft tube at the rear end interface of the coating solution or the coating solution, or at the rear part of the coating solution. An applicator that houses a slide stopper that advances in close contact with the rear end interface of the grease, and forms a narrow groove on the inner surface of the shaft tube, and the narrow groove is near the rear end of the coating liquid, or The gist is that the grease is formed from the vicinity of the rear end of the grease disposed at the rear portion of the coating liquid toward the rear portion of the shaft cylinder.

The present invention has a pen tip and a shaft tube connected to the rear end of the pen tip, and is disposed in the shaft tube at the rear end interface of the coating solution or the coating solution, or at the rear part of the coating solution. An applicator that houses a slide stopper that advances in close contact with the rear end interface of the grease, and forms a narrow groove on the inner surface of the shaft tube, and the narrow groove is near the rear end of the coating liquid, or Since the grease is arranged from the vicinity of the rear end of the grease arranged at the rear of the coating liquid toward the rear of the shaft cylinder, the slide plug is opened at the rear end of the shaft cylinder when the coating liquid is already filled in the shaft cylinder. Even if the slide plug is inserted from the portion, the slide plug is not pushed back by the air in the shaft tube, and the slide plug can be easily inserted until it comes into close contact with the rear end interface of the coating liquid.

The longitudinal cross-sectional view which shows 1st Example (insertion process of a slide stopper). The A section enlarged view of FIG. FIG. 3 is a cross-sectional view taken along a line YY in FIG. 2. The longitudinal cross-sectional view which shows 1st Example (at the time of completion of insertion of a slide stopper). The B section enlarged view of FIG. FIG. 6 is a cross-sectional view taken along the line ZZ in FIG. 5. FIG. 3 is a view corresponding to FIG. 3 showing a modification of the narrow groove in the first embodiment. FIG. 3 is a view corresponding to FIG. 3 showing a modification of the narrow groove in the first embodiment. The longitudinal cross-sectional view which shows 2nd Example (at the time of completion of insertion of a slide stopper).

Next, the operation will be described. It has a pen tip and a shaft connected to the rear end of the pen tip. After the grease placed at the rear end interface of the coating solution or the coating solution in the shaft tube An applicator containing a slide stopper that advances in close contact with an end interface, and forms a narrow groove on the inner surface of the shaft tube, and the narrow groove is formed near the rear end of the coating liquid or a coating liquid. When assembling the applicator formed from the vicinity of the rear end of the grease disposed at the rear part toward the rear part of the shaft cylinder, the slide stopper is already inserted into the rear end of the shaft cylinder while the application liquid is filled in the shaft cylinder. When inserted through the opening, the air in the shaft tube is pushed forward. That is, the compression action works, but the shaft cylinder used in the applicator of the present invention has a narrow groove on the inner surface of the shaft cylinder, and the narrow groove is located near the rear end of the coating liquid from the rear portion of the shaft cylinder. It is formed towards. That is, the contact between the inner surface of the shaft cylinder and the slide stopper is partially separated. As a result, the air to be compressed in the shaft tube is discharged to the outside of the shaft tube through the narrow groove. That is, due to the discharge of the air in the shaft tube to the outside, the air in the shaft tube is not hermetically compressed between the coating liquid and the slide plug, and the slide plug is not pushed back backward. As a result, the slide stopper can be easily inserted until it comes into close contact with the rear end interface of the coating liquid or the rear end interface of the grease.

Hereinafter, the first embodiment will be described in detail with reference to FIGS. 1, 2, and 3 are a longitudinal sectional view, an enlarged view, and a lateral sectional view showing a state in which a slide stopper has started to be inserted from the rear end opening of the shaft cylinder into the shaft cylinder already filled with the coating liquid. is there. 4, 5 and 6 are a longitudinal sectional view, an enlarged view and a transverse sectional view showing a state in which the slide stopper is inserted and the coating liquid reaches the rear end interface.

The writing instrument main body 1 includes a shaft cylinder 2, a chip holder 4 press-fitted into the tip inner hole 3 of the shaft cylinder 2, a ball pen tip 6 press-fitted into the tip inner hole 5 of the tip holder, and a tip 7 of the ball pen tip. A ball 8 disposed rotatably, a coating liquid 9 accommodated in the shaft cylinder 2, a liquid grease 10 disposed in close contact with a rear end of the coating liquid 9, and a rear end of the grease 10 It is comprised from the slide stopper 11 arrange | positioned closely. Then, the coating liquid 9 is supplied to the surface of the ball 8 through the inner holes of the shaft cylinder 2, the tip holder 4 and the ballpoint pen tip 6.

In this example, a pen tip 12 is constituted by a tip holder 4, a ball-point pen tip 6 press-fitted into the tip inner hole 5 of the tip holder, and a ball 8 rotatably arranged at the tip 7 of the ball-point pen tip. However, the ball-point pen tip 6 on which the ball 8 is disposed may be used as the pen tip 12 and press-fitted into the tip inner hole 3 of the shaft tube.
Further, in this example, the ballpoint pen tip 6 was cited as an example of the nib 12, but a sintered body formed by injection molding or a so-called fiber nib formed by polishing and cutting a fiber converging body, formed by extrusion molding, A so-called resin nib can also be used as appropriate.

The coating liquid 9 accommodated in the shaft cylinder 2 is an oil-based ink whose main medium is an organic solvent such as alcohol, but water-based ink whose main medium is water can also be used and is a coloring component. Pigments and / or dyes, high-boiling organic solvents to prevent freezing, resin components that provide fixability to the writing surface, surfactants and polysaccharides that adjust surface tension, viscoelasticity, lubricity, etc. What mix | blended rust, an antifungal agent, etc., and what mixed white concealing components, such as a titanium oxide for the purpose of typographical correction etc., may be used.

The slide plug 11 accommodated in the shaft cylinder 2 has a cylindrical shape, and is in sliding contact with the inner surface 14 of the shaft cylinder by an annular protrusion 13 formed in the middle of the cylinder. In addition, the shape of the slide stopper 11 can be appropriately selected according to the purpose, such as a spherical shape or a bottomed cylindrical shape. The annular protrusion 13 is not necessarily required, but is preferably formed in order to improve the slidability and stability with the inner surface 14 of the shaft tube. The number of the annular protrusions 13 is one in this example, but two or three may be formed on the top and bottom.

Further, the slide stopper 11 is made of nitrile rubber having an Asker C hardness of 50 degrees, but may be made of other rubber materials or elastomers such as butyl rubber or silicon rubber, or polyethylene resin or polypropylene resin. As long as it has good adhesion and slidability with the inner surface 14 and is compatible with the coating solution 9, there is no change in shape such as swelling, dissolution, decomposition, etc. can do. In this example, the cylindrical portion 15 and the annular protrusion 13 of the slide plug 11 are integrally provided. However, they may be separate from each other, and may be formed of different materials.

Also, if the grease 10 is filled in close contact with the rear end of the coating solution 9 to form a partition wall with the slide plug 11, even a material compatible with the coating solution 9 can be adopted as the slide plug 11. it can. Examples of the grease 10 include an aqueous grease in which water, ethylene glycol, glycerin and the like are thickened, an oily grease in which silicone, liquid paraffin, polybutene, and alpha-olefin are gelled or thickened, and the slide stopper 11. Can be appropriately selected as long as they are not compatible with each other and do not cause reversal with the coating liquid 9.

The shaft cylinder 2 is an injection-molded product of polypropylene resin, but if it is a material that does not undergo alteration or shape change such as swelling / dissolution / decomposition by the coating liquid 9 or grease 10 and has a low water vapor permeability, A resin such as nylon or nylon, a resin surface subjected to aluminum vapor deposition or silicon oxide vapor deposition, a resin mixed with aluminum powder or glass powder, or a metal such as stainless steel or brass may be used.

A narrow groove 18 having a rectangular cross section extends from the vicinity 16 of the rear end of the grease to the rear end 17 of the shaft on the inner surface 14 of the shaft cylinder. The contact with the protrusion 13 of the slide stopper is partially separated. Incidentally, the vicinity 16 of the rear end of the grease refers to a portion where the protrusion 13 of the slide plug is located when the front end surface 19 of the slide plug is in close contact with the rear end interface 20 of the grease. The inner surface 14 of the shaft tube and the projection 13 of the slide stopper are set so as to be in sliding contact with the entire circumference. Therefore, when the slide stopper 11 is inserted from the rear end opening 21 of the shaft cylinder in a state where the coating liquid 9 and the grease 10 are already filled in the shaft cylinder 2, the air 22 in the shaft cylinder is pushed forward. However, in the pushing process, the air 22 is discharged to the outside of the shaft tube 2 through the narrow groove 18. That is, the air 22 in the shaft cylinder is not hermetically compressed between the grease 10 and the slide stopper 11 and does not push the slide stopper 11 backward. As a result, the slide stopper 11 can be easily inserted until it comes into close contact with the rear end interface 20 of the grease.

  The shaft cylinder 2 of the present example has a straight inner surface 14 from the front to the rear, but at least between the vicinity 16 of the rear end of the grease and the front end 23 of the shaft cylinder, What is necessary is just to set so that the protrusion 13 may slidably contact on the entire circumference. That is, a taper shape in which the inner diameter in the vicinity of the rear end 16 of the grease from the rear end 17 of the shaft cylinder is made larger than the outer diameter of the slide stopper 11 or the inner diameter is gradually reduced from the rear end 17 to the front end 23. Or you may. Incidentally, when the inner surface 14 of the shaft cylinder is tapered, it is easy to separate from the forming pin (core pin) forming the inner surface 14 of the shaft cylinder.

The narrow groove 18 only partially separates the contact between the inner surface 14 of the shaft tube 2 and the slide plug 11, and the close contact between the slide plug 11 and the inner surface 14 of the shaft tube is maintained except for a part thereof. Has been. Therefore, the slide plug 11 can be accurately arranged without being tilted or inverted in the shaft tube 2. The cross-sectional shape of the narrow groove 18 may be a semicircular shape or a fan shape as shown in FIGS. 7 and 8 as long as the protrusion 13 of the slide plug enters the narrow groove and does not hinder the air flow. Alternatively, a plurality of them may be formed, and the depth and width may be appropriately selected.
Further, in this example, the grease 10 is interposed between the coating liquid 9 and the slide stopper 11, but the rear end of the coating liquid 9 depends on the viscosity of the coating liquid 9 and the inner diameter of the shaft cylinder 2. Alternatively, the slide stopper 11 may be directly arranged. When the slide stopper 11 is directly disposed at the rear end of the coating liquid 9, the vertical groove 18 may be formed between the vicinity of the rear end of the coating liquid 9 and the rear end 17 of the shaft tube.

Next, the second embodiment will be described in detail with reference to FIG. The writing instrument body 24 rotates to the shaft cylinder 2, the tip holder 4 press-fitted into the tip inner hole 3 of the shaft cylinder, the ball-point pen tip 6 press-fitted into the tip inner hole 5 of the tip holder, and the tip 7 of the ball-point pen tip. The ball 8 that is freely disposed, the coating liquid 9 accommodated in the shaft cylinder 2, the grease 10 disposed in close contact with the rear end of the coating liquid 9, and the rear end of the grease 10 The slide plug 11 arranged in this manner, the spring 25 arranged behind the slide plug, the fall of the spring 25 is prevented, and the tail plug 26 press-fitted into the rear end opening 21 of the shaft tube. It is configured. This is an example of a so-called pressure-type writing instrument.
Incidentally, in a pressure-type writing instrument, pressure is applied to the coating liquid and / or grease through the slide plug by the pressurization system, so that the coating liquid and / or grease pushes between the slide plug and the shaft cylinder and slides the slide. There is a high risk of leakage to the back of the stopper. Therefore, the press-fitting allowance with respect to the inner surface of the shaft cylinder of the slide stopper is further increased. As a result, it becomes increasingly difficult to insert the slide stopper to a position where it comes into close contact with the rear end interface of the coating liquid and / or grease. However, in the pressure-type writing instrument of the present embodiment, the narrow groove 18 provided on the inner surface 14 of the shaft tube allows the slide plug 11 to be pressed into the inner surface 14 of the shaft tube with a sufficiently large allowance, even if the allowance for the slide plug 11 is set sufficiently large. Air circulation between the air 22 and the outside is ensured. As a result, the slide stopper 11 can be easily inserted until it comes into close contact with the rear end interface 20 of the grease, and leakage of the grease 10 due to pressurization can be prevented.

Hereinafter, the description of the same configuration as that of the first embodiment is omitted.
The spring 25 is a pressurizing system that urges the slide stopper 11 forward to assist the discharge of the coating liquid 9. The spring 27 abuts the front end 27 of the spring against the rear end face 28 of the slide stopper, and the spring rear end 29. Is compressed and installed in contact with the front end face 30 of the tail plug. The spring 25 is made of stainless steel, and its outer diameter is designed to be slightly smaller than the inner diameter of the shaft cylinder 2. In this example, the pressurizing system is a spring, but it may be a compressed gas or a pump as long as the slide plug can be urged forward.

The tail plug 26 has a substantially columnar shape, and maintains the air flow without blocking the narrow groove 31 at the press-fitted portion with the shaft tube 2. It is not always necessary to maintain the narrow groove 31 in the portion so as to allow ventilation. Further, instead of the tail plug 26, the rear end 29 of the spring may be fixed to the shaft tube 2 by caulking or welding. In this example, since the pressurizing system is a spring, the rear of the slide plug 11 is communicated with the outside air so that the slide plug 11 can easily move forward. In this case, a tail plug having a sealing property may be used. As an example of the sealing tail plug, there is a means for sealing the narrow groove 31 which has a cylindrical shape and has a protrusion on its side surface or the tail plug itself is deformed. In addition, if the air 22 in the shaft cylinder is compressed and the slide plug 11 is not pushed back backward at the time of insertion, a narrow groove is not formed from the rear end 17 of the shaft cylinder to an area necessary for sealing. The tail plug 26 may be formed in a columnar shape.

1 writing instrument body 2 axis cylinder 3 tip cylinder inner hole 4 tip holder 5 chip holder inner hole 6 ball pen tip 7 ball pen tip 8 ball 9 coating liquid 10 grease 11 slide plug 12 nib 13 protrusion 14 axis cylinder The inner surface 15 of the cylinder 16 The vicinity of the rear end of the grease 17 The rear end 18 of the cylinder 18 The narrow groove 19 The front end face 20 of the slide plug The rear end interface 21 of the grease 22 The rear end opening 22 of the cylinder Writing instrument body 25 spring (pressure system)
26 Tail plug 27 Spring front end 28 Slide plug rear end surface 29 Spring rear end 30 Tail plug front end surface 31 Press-fitting narrow groove

Claims (4)

It has a pen tip and a shaft connected to the rear end of the pen tip. After the grease placed at the rear end interface of the coating solution or the coating solution in the shaft tube An applicator containing a slide stopper that advances in close contact with an end interface, and forms a narrow groove on the inner surface of the shaft tube, and the narrow groove is formed near the rear end of the coating liquid or a coating liquid. An applicator formed from the vicinity of the rear end of the grease disposed in the rear part toward the rear part of the shaft cylinder. The applicator according to claim 1, wherein an annular protrusion is formed on the peripheral surface of the slide stopper, and the annular protrusion is slidably contacted with the inner surface of the shaft tube. The applicator according to claim 1 or 2, wherein liquid grease is interposed between a rear end portion of the application liquid and the slide stopper. The applicator according to any one of claims 1 to 3, wherein the slide stopper is urged toward the pen tip by a pressure system.

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