Applicator

Abstract

To provide an applicator provided with a chip-proof brush tip which can be held together properly, which can solve the problem that in an applicator which is disclosed, ribs extend to a vicinity of an opening part at a front end of a fixed tube and therefore the ribs contact the vicinity of a front end of a brush tip, so that portions contacting the ribs cause the brush tip to be broken, which makes it difficult to hold the brush tip together.SOLUTION: In an applicator according to the present invention, a plurality of ribs extending along a longitudinal direction of a fixed tube are formed on an inner wall surface of the fixed tube and the ribs are not extended to a front end part of the fixed tube.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an applicator having a brush tip as an application tip. [Background technology]

[0002] Conventionally, inventions relating to applicators equipped with a brush tip as an application target have been disclosed. For example, Patent Document 1 (JP Patent Publication No. 2022-108160) discloses an invention of an applicator in which the brush tip is assembled via a fixed tube that is a cylindrical member and has ribs formed on the inner wall surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-108160 Summary of the Invention [Problem to be solved by the invention]

[0004] In the applicator disclosed in Patent Document 1, the ribs extend to the vicinity of the front opening of the fixed tube, so that the tip also comes into contact with the ribs near the front end of the brush head, causing the tip to crack at these contact points, making it difficult to keep the tip together.

[0005] An object of the present invention is to provide an applicator having a brush tip that is less likely to break and has good manageability. [Means for solving the problem]

[0006] The gist of the present invention is an applicator comprising at least a brush tip, a fixed tube, and a barrel, wherein the brush tip is a bundle of brush tip fibers, the fixed tube is a hollow cylindrical member that is housed so that the front of the brush tip is exposed from the front end opening, the rear of the fixed tube is connected to the front of the barrel, and a number of ribs extending along the longitudinal direction of the fixed tube are formed on the inner wall surface of the fixed tube, but the ribs do not extend to the front end of the fixed tube. Effect of the Invention

[0007] In the applicator of the present invention, the rib does not extend to the front end of the fixed tube, so the vicinity of the front end of the tip can come into contact with the area of ​​the inner wall of the fixed tube where the rib is not present. As a result, as the tip is inserted into the fixed tube, contact with the rib prevents and eliminates twisting and tangling of the fibers that make up the tip, while the contact points with the rib, which are likely to become the starting point of cracks, can be avoided from the vicinity of the front end of the tip, resulting in an applicator with a tip that is less likely to crack and maintains good shape. [Brief description of the drawings]

[0008] [Figure 1] Appearance of applicator 1 [Diagram 2] FIG. 1 is a perspective view of the fixed tube 3. [Diagram 3] Vertical cross-section of fixed tube 3 [Figure 4] Rear longitudinal view of fixed tube 3 [Diagram 5] A longitudinal sectional view of the applicator 1 [Figure 6] Enlarged view of part A in Figure 4 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the applicator according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiment, and various modifications can be made without departing from the gist of the present invention.

[0010] Fig. 1 is an external view of an applicator 1 according to the present invention. Applicator 1 is a so-called brush pen. Other examples of embodiments of the applicator according to the present invention include a paint brush, a paint brush, an eyeliner, and an eyebrow pencil. Applicator 1 is composed of at least a brush tip 2, a fixed tube 3, and a barrel 4. In the longitudinal direction of applicator 1, the side of brush tip 2 will be described as the "front" or "forward" and the opposite side as the "rear" or "rearward."

[0011] The brush tip 2 is a bundle of brush tip fibers. The material of the brush tip fiber used in the brush tip 2 can be appropriately selected from nylon (6,6-nylon, 6-nylon, 12-nylon, 6,10-nylon, 6,12-nylon, 10,10-nylon, etc.), polyester (polybutylene terephthalate, polyethylene terephthalate, polybutylene naphthalate, polyethylene naphthalate, polytrimethylene terephthalate, etc.), polyurethane, polyacrylonitrile, acrylonitrile-styrene copolymer, acrylonitrile-butadiene copolymer, etc., or composites of these materials. In addition, inorganic fillers such as calcium, manganese, zinc, copper, calcium carbonate, kaolinite, clay, and aluminum hydroxide can be added to the material resin from which the brush tip fiber is obtained using these materials to impart mechanical and physical properties such as strength, abrasion resistance, chemical resistance, heat resistance, and shape stability, or the particle size and amount of these inorganic powders on the surface can be adjusted to a desired surface roughness. In this embodiment, the brush tip 2 is made of a mixture of two types of fibers: nylon resin brush tip fibers and polyester resin brush tip fibers. The rear end of the brush tip 2 is integrated by thermal welding, and the resin protruding radially outward forms a flange 2a that is connected in the circumferential direction.

[0012] FIG. 2 is an external perspective view of the fixed tube 3, and FIG. 3 is a vertical cross-sectional view of the fixed tube 3. The fixed tube 3 is a molded product made of polypropylene resin. The fixed tube 3 is a hollow cylindrical member. A part of the brush tip 2 is housed inside the fixed tube 3. The front of the brush tip 2 is exposed from the front end opening of the fixed tube 3. The rear of the fixed tube is connected to the front of the barrel 4. When assembling the applicator 1, the brush tip 2 is inserted from the front through the rear end opening of the fixed tube 3, and the rear of the fixed tube 3 is connected to the front of the barrel 4 with the front of the brush tip 2 exposed from the front end opening of the fixed tube 3. When the brush tip 2 is inserted through the rear end opening of the fixed tube 3, the flange 2a comes into contact with the rear end of the rib 3a, completing the insertion.

[0013] A plurality of ribs 3a extending along the longitudinal direction of the fixed tube 3 are formed on the inner wall surface of the fixed tube 3. The ribs 3a do not extend to the front end of the fixed tube 3. Therefore, the front of the brush tip 2 can be brought into contact with the area of ​​the inner wall surface of the fixed tube 3 where the ribs 3a are not present. In other words, the applicator 1 can be used with the front of the brush tip 2 not in contact with the ribs 3a. Thus, as the brush tip 2 is inserted into the fixed tube 3, the brush tip fibers constituting the brush tip 2 are prevented from twisting or entangling by the contact with the ribs 3a, and the contact points with the ribs 3a, which are likely to be the starting points of cracks, can be avoided from the front of the brush tip 2, resulting in a brush tip that is less likely to crack and has good coherence.

[0014] The longitudinal distance X from the front end of the rib 3a to the front end of the fixed tube 3 is greater than the longitudinal distance Y of the rib 3a. Therefore, as the tip 2 is inserted into the fixed tube 3, a portion of the tip 2 that has once come into contact with the rib 3a can have a larger area in contact with the area of ​​the inner wall of the fixed tube 3 where the rib 3a is not present, which is preferable as it makes the tip less likely to break and more manageable.

[0015] The rib 3a is formed so that its width gradually narrows from the rear to the front. The width is the length of the chord between both ends of the rib 3a that contact the inner wall surface of the fixed tube 3 in a cross section perpendicular to the longitudinal direction of the fixed tube 3. Therefore, the contact between the rib 3a and the tip 2 prevents and eliminates twisting and tangling of the tip fibers that make up the tip 2, while the width of the rib 3a that bites into the tip 2 gradually narrows near the front end of the rib 3a, so that cracks are less likely to occur in the tip 2 starting from the point where the rib 3a bites into it, resulting in a well-organized tip, which is preferable.

[0016] The inner diameter of the fixed tube 3 in the entire longitudinal range where at least a part of the brush tip 2 is arranged gradually decreases from the rear to the front. The inner diameter in this range refers to the span length of the inner wall surface of the fixed tube 3 where the rib 3a is formed, excluding the rib 3a. Since the inner diameter in this range gradually decreases from the rear to the front, as described below, when the brush tip 2, part of whose outer diameter gradually decreases toward the front, is inserted through the rear end opening of the fixed tube 3, the brush tip fibers can be regulated to conform to the desired external shape of the brush tip 2, which is preferable because it makes it easier to prevent the brush tip fibers from becoming entangled when the outer wall surface of the brush tip 2 is forcibly pressed against the inner wall surface of the fixed tube 3.

[0017] FIG. 4 is a view in the longitudinal direction of the rear of the fixed tube 3 (a view of the inside of the fixed tube 3 as seen from the rear). The angle of view from one direction perpendicular to the longitudinal direction of the fixed tube 3 and the shaft tube 4 is referred to as the longitudinal view. The area of ​​the maximum inscribed circle B, which has the apex of each rib 3a as a contact point, is approximately constant. The apex of each rib 3a is the position of each rib 3a that protrudes most radially inward from the inner wall surface of the fixed tube 3. The area of ​​the maximum inscribed circle B is approximately constant over the entire range in the longitudinal direction in which the rib 3a exists. Therefore, the radial height of the rib 3a gradually decreases toward the front relative to the inner wall surface of the fixed tube 3, which gradually reduces in diameter toward the front, and the amount by which the rib 3a bites into the brush tip 2 can be gradually reduced. Therefore, cracks are less likely to occur starting from the point where the rib 3a bites into the brush tip 2, which is preferable because the brush tip can be made well-organized.

[0018] There is a range in front of the rib 3a where the area of ​​the maximum inscribed circle B is the same as the area of ​​a cross section perpendicular to the longitudinal direction of the fixed tube 3. Specifically, it is immediately in front of the front end of the rib 3a. Therefore, from the range where the rib 3a exists relative to the tip 2 to the inner wall surface of the fixed tube 3 immediately in front of that range, it is possible to prevent a sudden change in the contact relationship between the tip and the rib 3a and the inner wall surface of the fixed tube 3, such as a step that can be confirmed when the front end of the rib 3a is viewed from the front of the fixed tube 3. Therefore, cracks are less likely to occur starting from the point where the rib 3a bites into the tip 2, and the tip can be made more compact, which is preferable.

[0019] There is a longitudinal range in which the cross-sectional area in the direction perpendicular to the longitudinal direction is larger than the area of ​​the maximum inscribed circle B in the longitudinal range in which the rib 3a of the brush tip 2 exists. The longitudinal range in which the rib 3a of the brush tip 2 exists is the longitudinal range of the brush tip 2 excluding the longitudinal range of the brim 2a located behind the rear end of the rib 3a and the vicinity of the front end of the brush tip 2 located forward of the front end of the rib 3a. Therefore, when the brush tip 2 is inserted into the fixed tube 3, the entire circumference of the brush tip 2 can be brought into contact with the rib 3a, and the rib 3a can sufficiently push aside the fibers for the brush tip, which is preferable because it can sufficiently prevent and eliminate the twisting and entanglement of the fibers for the brush tip. When the brush tip 2 is inserted into the fixed tube 3, the rib 3a can always be brought into contact only with the rear of the brush tip 2, which suppresses unintended displacement of the fibers for the brush tip in the circumferential direction when the applicator 1 is used, and is preferable because it can prevent the fibers for the brush tip from twisting and entanglement.

[0020] The center of the maximum inscribed circle B is at least parallel to and approximately concentric with the axis of the fixed tube 3 over the entire longitudinal range in which the rib 3a exists. Therefore, the radial height of the rib 3a from the inner wall surface of the fixed tube 3 is approximately constant, which is preferable because it reduces variation in the amount that the rib 3a bites into the brush tip 2 and results in a well-organized brush tip. "Approximately concentric" includes slight differences in measurement values ​​due to tolerances and unintended deviations due to deformation of components over time.

[0021] When viewed in the longitudinal direction, if the radius of curvature of the top of the rib 3a is 0.05 mm or more and 0.50 mm or less, a moderately sharp top can be formed for the tip 2, the rib 3a can be smoothly passed between the tip fibers that make up the tip 2, and it is possible to prevent some of the tip fibers from being pressed radially inward. Therefore, as the tip 2 is inserted into the fixing tube 3, twisting and tangling of the tip fibers can be easily prevented and eliminated, which is preferable.

[0022] When viewed in the longitudinal direction, if the angle θ between the line segments passing through the tops of the ribs 3a adjacent in the circumferential direction and the center of the maximum inscribed circle B is 20° or more and 45° or less, the ribs 3a can be appropriately spaced apart in the circumferential direction. This ensures sufficient space between the ribs 3a for the tip fibers to pass through, which is preferable because it makes it easier to prevent and eliminate twisting and entanglement of the tip fibers as the tip 2 is inserted into the fixing tube 3. The number of ribs 3a is preferably 8 to 18.

[0023] If the maximum width of each rib 3a is 0.15 mm or more and 0.65 mm or less, the rib 3a can adequately push aside the individual tip fibers as the tip 2 is inserted into the fixing tube 3, which is preferable as it allows the tip fibers to be adequately prevented and eliminated from twisting or tangling.

[0024] FIG. 5 is a longitudinal cross-sectional view of the applicator 1, and FIG. 6 is an enlarged view of part A in FIG. 5. The tip 2 has an outer diameter that gradually decreases from at least the middle of the longitudinal direction toward the front. In other words, the tip 2 gradually becomes thinner from at least the middle of the longitudinal direction toward the front. The tip 2, which is a bundle of tip fibers, has an almost constant outer diameter in the same cross section perpendicular to the longitudinal direction, since the tip 2 is almost circular. The tip fibers constituting the tip 2 also have an outer diameter that gradually decreases from the middle of the longitudinal direction toward the front, so that the outer diameter of the entire tip 2 can also be decreased. The tip 2 and the tip fibers can also be decreased in diameter from the rear end. Methods for decreasing the outer diameter of each tip fiber include, for example, a method using a treatment liquid that is a mixture of meta-cresol and calcium chloride-methanol solution, a method of stretching the tip fiber by applying heat stretching, and a method of grinding with a grinder.

[0025] The outer diameter of the tip 2 is approximately constant for a certain distance from the rear end of the tip 2 (excluding the flange 2a) toward the front. The certain distance from the rear end of the tip 2 toward the front where the outer diameter starts to decrease is the maximum outer diameter portion of the tip 2. The maximum outer diameter portion of the tip 2 is in contact with the entire longitudinal range of the rib 3a. This is preferable because it is easier to prevent and eliminate twisting and tangling of the tip fibers as the tip 2 is inserted into the fixed tube 3. Furthermore, the maximum outer diameter portion of the tip 2 is in contact with at least a part of the longitudinal range from the front end of the rib 3a to the front end of the fixed tube 3. This is preferable because it is possible to more reliably bring the portion of the tip 2 with the reduced outer diameter into contact only with the inner wall surface of the fixed tube 3 in the area without the rib 3a, resulting in a well-organized tip.

[0026] The barrel 4 is a molded product made of polypropylene resin. The barrel 4 is a hollow cylindrical member. The rear of the fixed tube 3 is inserted and connected to the front end opening of the barrel 4. A tail plug 5 is disposed at the rear end opening of the barrel 4. The barrel 4 contains the coating liquid L. In this embodiment, the coating liquid L is contained by disposing the coating liquid occluder 6, which is a bundle of acrylic fibers impregnated with the coating liquid L, inside the barrel 4. The coating liquid occluder 6 is a cylindrical member. The material of the coating liquid occluder 6 can be appropriately selected from a fiber bundle made of polyester (polybutylene terephthalate, polyethylene terephthalate, polytrimethylene terephthalate, etc.) fibers, polyamide fibers, acrylic fibers, etc., or a porous body such as urethane or sponge.

[0027] The coating liquid L impregnated in the coating liquid occlusion body 6 is supplied to the brush tip 2, thereby forming handwriting on the coating surface. An intermediate core 7 is provided to supply the coating liquid L from the coating liquid occlusion body 6 to the brush tip 2. The longitudinal rear end of the intermediate core 7 is inserted from the front end face of the coating liquid occlusion body 6, and the longitudinal front end of the intermediate core 7 is inserted from the flange 2a forming the rear end of the brush tip 2. Within the longitudinal range of the brush tip 2, a force acts from the radial inside to the radial outside, which tries to expand the outer diameter of the brush tip 2. The intermediate core 7 is made of polyethylene terephthalate resin, and can supply the coating liquid L from the coating liquid occlusion body 6 to the brush tip 2 by capillary force.

[0028] The front end of the intermediate core 7 is located inside the fixed tube 3 within a longitudinal range forward of the front end of the rib 3a and rearward of the front end of the fixed tube 3. This increases the likelihood of contact between the tip 2 and the area of ​​the inner wall surface of the fixed tube 3 that does not have the rib 3a. The intermediate core 7 prevents the tip 2 from twisting or tangling as it tries to spread from the radial inside to the radial outside, which is preferable because it allows the tip to maintain any desired external shape and provide a well-organized tip.

[0029] The material of each resin molded product can be appropriately selected from polypropylene resin, polycarbonate resin, acrylic resin, polyethylene resin, polyamide resin, polybutylene terephthalate resin, polybutylene naphthalate resin, polyethylene naphthalate resin, vinyl chloride resin, ethylene-vinyl alcohol copolymer, polyacrylonitrile resin, fluororesin, polyacetal resin, polyethylene terephthalate resin, polystyrene resin, ABS resin, silicone resin, elastomer, or composite material containing these resins, taking into consideration moldability and reactivity with the coating liquid L. In addition, various coatings or printing can be applied to the inner wall surface and / or outer wall surface of each member, taking into consideration reactivity and permeability depending on the coating liquid L used. [Explanation of symbols]

[0030] 1 Applicator 2 Brush tip 2a Tsuba 3 Fixed tube 3a Rib 4 shaft cylinder 5. Tail plug 6 Coating liquid occlusion body 7 Relay core

Claims

1. An applicator comprising at least a brush tip, a fixed tube, and a barrel, The tip of the brush is a bundle of brush tip fibers, The fixed tube is a hollow cylindrical member, and is housed in the brush so that the front of the brush tip is exposed from the front end opening, and the rear of the fixed tube is connected to the front of the barrel; A plurality of ribs extending along the longitudinal direction of the fixed tube are formed on the inner wall surface of the fixed tube, The rib does not extend to the front end of the fixed tube. Applicator.

2. A longitudinal distance from a front end of the rib to a front end of the fixed tube is greater than a longitudinal distance of the rib; The applicator of claim 1.

3. The rib is formed so that its width gradually narrows from the rear to the front. The applicator according to claim 1 or 2.

4. The tip of the brush has an outer diameter that gradually decreases from at least the middle of the longitudinal direction toward the front, and the maximum outer diameter portion of the tip of the brush is in contact with the entire longitudinal range of the rib and at least a part of the longitudinal range from the front end of the rib to the front end of the fixed tube. The applicator according to claim 1 or 2.

5. The tip of the brush has an outer diameter that gradually decreases from at least the middle of the longitudinal direction toward the front, and the maximum outer diameter portion of the tip of the brush is in contact with the entire longitudinal range of the rib and at least a part of the longitudinal range from the front end of the rib to the front end of the fixed tube. The applicator according to claim 3.

6. A coating liquid is contained inside the barrel, A relay core is provided for supplying the coating liquid to the brush tip, The intermediate core is inserted in the longitudinal direction from the rear end of the brush tip. The front end of the relay core is located within the fixed tube within a longitudinal range forward of the front end of the rib and rearward of the front end of the fixed tube. The applicator according to claim 1 or 2.

7. A coating liquid is contained inside the barrel, A relay core is provided for supplying the coating liquid to the brush tip, The intermediate core is inserted in the longitudinal direction from the rear end of the brush tip. The front end of the relay core is located within the fixed tube within a longitudinal range forward of the front end of the rib and rearward of the front end of the fixed tube. The applicator according to claim 3.

8. A coating liquid is contained inside the barrel, A relay core is provided for supplying the coating liquid to the brush tip, The intermediate core is inserted in the longitudinal direction from the rear end of the brush tip. The front end of the relay core is located within the fixed tube within a longitudinal range forward of the front end of the rib and rearward of the front end of the fixed tube.

5. The applicator according to claim 4.

9. A coating liquid is contained inside the barrel, A relay core is provided for supplying the coating liquid to the brush tip, The intermediate core is inserted in the longitudinal direction from the rear end of the brush tip. The front end of the relay core is located within the fixed tube within a longitudinal range forward of the front end of the rib and rearward of the front end of the fixed tube. The applicator according to claim 5.

Images