WO2020209024A1

WO2020209024A1 - Applicator and brush-bristle mounting fixture

Info

Publication number: WO2020209024A1
Application number: PCT/JP2020/012009
Authority: WO
Inventors: 安永　雅博; 英則西村
Original assignee: 株式会社サクラクレパス
Priority date: 2019-04-08
Filing date: 2020-03-18
Publication date: 2020-10-15
Also published as: JP2020172030A

Abstract

[Problem] To provide: an applicator that can be manufactured inexpensively and has good cohesion at a tip end portion of brush-bristles; and a brush-bristle mounting fixture used with said applicator. [Solution] An applicator in which brush-bristles are mounted to a brush shaft with a brush-bristle mounting fixture, wherein a brush-bristle mounting fixture 13 has a brush-bristle mounting hole 37. A shape changing section 71 that changes the shape of the brush-bristles inserted from the rear side is provided in a portion of the brush-bristle mounting hole 37. The shape changing section 71 is a portion where a transverse cross-sectional area decreases toward the tip end side. The shape changing section 71 is formed in a region spanning from the rear end of the brush-bristle mounting hole 37 to a portion spaced from the rear end by L1/2, where L1 is the full length of the brush-bristle mounting hole 37.

Description

Applying tool and brush ear attachment

The present invention relates to an applicator provided with brush ears formed by bundling fibers. It also relates to a brush ear attachment used in such an application tool.

There is known a coating tool that has a liquid such as water built inside the brush shaft and supplies the liquid from the inside of the brush shaft to the tip side of the brush by pushing the brush shaft. As such a coating tool, for example, there is a coating tool disclosed in Patent Document 1.

The coating tool disclosed in Patent Document 1 has a brush tip attached to a shaft tube via a fixing member. Specifically, the brush tip is inserted and fixed in the fixing member, and the brush tip and the fixing member are inserted and fixed in the shaft cylinder.

Here, the fixing member is formed with a through hole penetrating from the front end to the rear end, and the cross-sectional shape of the through hole is a flat shape (bale shape) from the front end to the rear end. That is, the through hole is a hole having the same or similar cross-sectional shape in the entire area from the front end to the rear end. Further, the brush tip also corresponds to the cross-sectional shape of the through hole, and the cross-sectional shape of the entire area from the front end to the rear end is flat.
Then, the brush tip is inserted from the rear end side of the through hole, and the tip of the brush tip is projected from the tip of the through hole.

That is, the coating tool of Patent Document 1 has the same overall shape of the brush tip and the through hole, and by matching these shapes, the brush tip is not forcibly deformed and the tip of the brush tip is less likely to be cracked. are doing. In other words, the fixing member of Patent Document 1 is intended to be attached to the barrel without deforming the entire shape of the brush tip.

Further, Patent Document 2 discloses a brush ear cover that deforms the tip shape of the brush ear. This brush tip cover is an accessory member of the brush tool (applying tool), and is attached to the tip of the brush shaft as needed. Then, by attaching it to the brush shaft, the entire shape of the brush tip is forcibly deformed into a flat shape.
That is, when the brush tip cover is not attached to the brush tool, the shape of the brush tip is round (cylindrical). On the other hand, when the brush ear cover is attached, the shape of the brush ear becomes flat (flat). From this, it is possible to use the brush ears of one brush ears in two shapes without preparing two brush ears having different shapes of the brush ears.

Here, the brush tool that adopts the brush tip cover of Patent Document 2 is used in the state where the brush tip cover is attached to the tip of the barrel and in the state where the brush tip cover is removed, as described above. For this reason, it is necessary to expose the brush ears to the outside by a certain length or more before and after attaching and detaching the brush ears cover so that the brush ears are easy to use in each state. Therefore, the brush ear cover is inevitably in the shape of a short cylinder (the length in the front-rear direction is short) in which the length in the front-rear direction (the direction from the tip side to the tail side) is constant or less. That is, the brush ear cover of Patent Document 2 has a short distance from the circular opening on the rear end side to the flat opening on the front side, and only a part of the middle part of the brush ear is positioned inside to forcibly compress and deform. It has a structure to make it.

JP-A-2017-99518 Japanese Patent No. 3927034

Here, in the coating tool of Patent Document 1, when a plurality of coating tools having different shapes of brush ears are manufactured, it is necessary to form the brush ears separately.
That is, in the coating tool of Patent Document 1, when the shape of the brush tip is round, it is necessary to form the brush tip having a circular cross-sectional shape from the front end side to the rear end side. Further, when the shape of the brush tip is flat, it is necessary to form a brush tip having a flat cross-sectional shape from the front end side to the rear end side.

Here, the brush ears are generally formed by bundling hair materials to form a hair bundle, and integrating the rear end portions of the hair bundle by welding (heat welding). Therefore, in the case of the coating tool of Patent Document 1, when the shape of the brush tip is round, the rear end portion must also be round, and when the shape of the brush tip is flat, the rear end portion is also flat. Must be a mold.
Therefore, when manufacturing a plurality of types of brushes, it is necessary to have equipment for welding the rear end portion of the hair bundle into a round shape and equipment for welding the rear end portion of the hair bundle into a flat shape. Further, when a plurality of facilities are required for manufacturing hair bundles, the facilities become large-scale. Since the site area of a factory or the like that manufactures brush tools is limited, it is not preferable that the equipment becomes large in this way, and the introduction of the equipment is costly, which leads to an increase in manufacturing cost.

Further, the brush tool using the brush tip cover of Patent Document 2 has a problem that the tip of the brush tip is easily cracked when the brush tip cover is attached, the tip of the brush tip is difficult to gather, and fine drawing cannot be performed when using the brush tip. It had been done.

Therefore, it is an object of the present invention to provide a coating tool that can be manufactured at low cost, has a well-organized tip portion of the brush tip, and does not easily crack the tip. Another object of the present invention is to provide a brush ear attachment used in such an application tool.

As a result of diligent studies by the present inventors in order to solve the above problems, the brush scion is deformed from the rear end side, and a large number of portions having a deformed cross section are present inside the brush scion attachment. , I found that it is possible to make the tip of the brush ear hard to break.
The invention according to claim 1, which is provided based on such findings, is an application tool that includes a brush tip and a brush shaft and attaches the brush tip to the brush shaft via a brush tip attachment tool. Has a brush tip mounting hole through which the brush tip is inserted, the brush tip mounting hole extends from the tail side to the tip side, and a part of the brush tip mounting hole is the brush inserted from the tail tail side. It is a shape deforming portion that deforms the shape of the ear, and the shape deforming portion is a portion where the area of the cross section decreases toward the tip side at least in the tip side portion, and the total length of the brush tip mounting hole is defined. When L1, the shape-deforming portion is a coating tool characterized in that it is formed in a range from the rear end of the brush tip mounting hole to a portion separated by L1 / 2.

According to the application tool of the present invention, the shape of the tip portion of the brush tip is deformed by inserting the brush tip into the brush tip attachment tool. For this reason, when manufacturing multiple types of application tools (brush tools) with different tip shapes, by attaching the brush tips using the brush tip attachments corresponding to each shape, brushes of the same shape are attached to each application tool. Ears can be used.
That is, when manufacturing a plurality of types of brushes having different tip shapes, it is not necessary to manufacture brush ears having different shapes, and the manufacturing cost can be reduced.
Further, by forming the shape-deformed portion in a range from the rear end of the brush tip mounting hole to a portion separated by L1 / 2, most of the brush tip in the longitudinal direction becomes the deformed shape. In addition, the portion to be deformed can be accommodated in a wide range inside the brush tip attachment. From this, it is possible to make the tip portion of the brush tip difficult to crack, and it is possible to provide an application tool in which the tip portion of the brush tip is well organized.

In the invention according to claim 2, at least a part of the brush tip mounting hole is formed with a tip-side shaping portion and the shape-deforming portion continuously, and the tip-side shaping portion is formed of the shape-deforming portion. It is a portion that is located on the tip side and has substantially the same cross-sectional area and shape of each part, and the length of the tip side shaping portion in the direction from the tail side to the tip side is that of the shape deformation portion. The coating tool according to claim 1, wherein the coating tool is 1.5 times or more longer than the length in the same direction.
Here, "substantially the same" in area and length means that they are completely the same and include an error of several percent, and the same applies hereinafter.
Further, "substantially the same" shape (planar shape) means that the part corresponding to one shape corresponds to the other shape in a state where one shape and the other shape are overlapped with each other. It is assumed that the difference is within plus or minus 0.5 mm, and the same shall apply hereinafter.
In other words, "substantially the same" includes those that are completely the same and those that are not completely the same but have a slight difference and that have the same effects and effects as when they are completely the same.

According to this configuration, the brush ears are housed inside the tip-side shaping portion that is long in the front-back direction (direction from the tail side to the tip side), and the tip portion of the brush ears can be well organized and hard to break.

According to the third aspect of the present invention, in the brush ear, a portion of the brush ear that is located inside the brush ear attachment is from the tail side to the tip side of the portion that protrudes outward from the tip portion of the brush ear attachment. The coating tool according to

claim

1 or 2, wherein the length in the direction toward the head is long.

According to this configuration, the tip of the brush can be better organized and less likely to crack.

In the invention according to claim 4, the shape-deformed portion and the tip introduction portion are continuously formed in a part of the brush tip mounting hole, and the tip introduction portion is located on the tail side of the shape deformed portion. It is a portion where the area of the cross section gradually decreases toward the tip side, and the area of the cross section of the tail side portion of the shape deformed portion is the area of the cross section of the front end side portion of the tip introduction portion. The application according to any one of claims 1 to 3, wherein at least the tip end side portion of the shape deformed portion is a portion in which the area of the cross section continuously decreases toward the tip end side. It is an ingredient.

According to such a configuration, it is preferable because it is easy to insert the brush tip into the brush tip attachment hole when manufacturing the coating tool and the manufacturing is easy.

In the invention according to claim 5, the brush ear has a hair bundle portion located on the tip side and a solid portion forming a rear end portion, and the rear end side portion of the hair bundle portion is the shape deformed portion. The coating tool according to any one of claims 1 to 4, wherein the coating tool is located inside the above.

According to this configuration, the root portion of the hair bundle portion is located inside the shape deformation portion, and the tip portion of the brush tip is more difficult to crack, which is preferable.

The invention according to claim 6 further includes a liquid supply regulating member that can supply liquid to the brush tip from the inside of the brush shaft and regulates the flow of the liquid, and the liquid supply regulating member is the same. It is attached so as to cover a part of the brush tip attachment from the outside, and the brush tip attachment is provided with a ridge portion protruding from the surroundings on the outer surface, and the ridge portion regulates the liquid supply. The coating tool according to any one of claims 1 to 5, wherein the relative movement of the member with respect to the brush tip attachment is restricted.

According to this configuration, it is possible to supply an appropriate amount of liquid when supplying liquid from inside the brush shaft to the brush spike. Further, by providing the brush tip attachment with a ridge portion (rib portion), it is possible to improve the strength of the brush tip attachment and prevent an unintended misalignment of the liquid supply regulating member.

The invention according to claim 7 is a brush tip attachment tool for attaching a brush tip to a brush shaft, which has a brush tip attachment hole through which the brush tip is inserted, and the brush tip attachment hole is from the tail side. A part of the brush tip mounting hole extending to the tip side is a shape deforming portion that deforms the shape of the brush tip inserted from the tail side, and the shape deforming portion is at least the tip side portion of the tip side. This is a portion where the area of the cross section decreases toward the direction of the brush, and when the total length of the brush tip mounting hole is L1, the shape deformed portion is separated from the rear end of the brush tip mounting hole by L1 / 2. It is a brush tip attachment that is characterized in that it is formed in the range up to the part.

Similar to the above, the brush tip attachment tool of the present invention can deform the shape of the tip portion of the brush tip, and it is possible to make the tip portion of the brush tip difficult to crack at that time. Therefore, it is possible to provide a coating tool that can be manufactured at low cost and that the tip portion of the brush tip is well organized.

According to the present invention, it is possible to provide a coating tool that can be manufactured at low cost and that the tip of the brush tip is well organized. In addition, a brush ear attachment used for such an application tool can be provided.

It is a perspective view which shows the brush tool which concerns on embodiment of this invention, and shows the state which the cap member was removed. It is an exploded perspective view which shows the brush main body of FIG. It is a perspective view which shows the front side cylinder part of FIG. It is a perspective view which shows the brush ear attachment of FIG. It is a perspective view which shows the state which the brush ear attachment of FIG. 4 was seen from another direction. It is a top view which shows the brush ear attachment of FIG. It is a side view which shows the brush ear attachment of FIG. It is a figure which shows the brush ear attachment of FIG. 4, and is the explanatory view which shows by partially breaking the periphery of the water supply groove part. It is a cross-sectional view of AA which shows the brush ear attachment of FIG. It is a partially broken perspective view which shows by breaking a part of the brush ear attachment of FIG. It is a figure which shows the cross section of the shape deformation part of the brush ear attachment, (a) is the end view of the cross section cut at the part shown by CC of FIG. 9, and (b) is the end view of FIG. It is an end view of the cross section cut at the portion shown by DD, and (c) is the end view of the cross section cut at the portion shown by EE of FIG. It is a figure which shows the cross section of the scion holding part of the brush ear attachment, (a) is the end view of the cross section cut at the part shown by FF of FIG. 9, (b) is FIG. It is an end view of the cross section cut at the portion shown by GG. It is BB sectional view which shows the brush ear attachment of FIG. It is a perspective view which shows the inner plug member of FIG. It is explanatory drawing which shows the state of inserting the brush ear of FIG. 2 from the rear side of the brush ear attachment, and is attached in the order of (a) to (c). It is explanatory drawing which shows the state of inserting the brush ear attachment of FIG. 2 from the rear side of the water supply regulation member, and is attached in the order of (a), (b). It is sectional drawing which shows the brush main body of FIG. 1, and shows the state in which the tip portion is arranged. It is a perspective view which shows the tip side part of the brush body of FIG. 1 enlarged, and shows the state which the tip part is arranged. It is explanatory drawing which shows the part of FIG. 15B enlarged. It is a figure which shows the cross section of the brush ear and the brush ear attachment, and is the end view of the cross section cut at the part shown by HH of FIG. 15C. It is a figure which shows the tip end side part of the brush body of FIG. 17, and is explanatory drawing which shows the state that the liquid flows to the hair bundle part of the brush ear in the brush body.

Hereinafter, the brush tool 1 (coating tool) according to the embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these examples.
Further, in the following description, unless otherwise specified, the brush tip (tip of the brush tip 14) side will be referred to as the tip side or the front side, and the opposite side in the longitudinal direction of the pair will be described as the tail side or the rear side.

As shown in FIG. 1, the brush tool 1 of the present embodiment is a brush formed by attaching a brush tip 14 to a tip portion of a brush shaft 30, and is a so-called main brush. That is, no core or pipe for supplying liquid is arranged inside the brush ear 14, and the structure is such that thread-like hairs are arranged in substantially the entire area from the center to the edge of the cross section of the brush ear 14. (Details will be described later).
This brush tool 1 is a brush used in calligraphy, and is used as a brush or a paintbrush.

As shown in FIG. 1, the brush tool 1 includes a brush tool main body 2 and a cap member 3.

As shown in FIG. 2, the brush body 2 includes a front cylinder portion 10, a rear cylinder portion 11, a water supply regulation member 12 (liquid supply regulation member), a brush ear attachment 13, and a brush ear 14. , The structure is provided with the inner plug member 15.

The front tubular portion 10 is a hollow member in which a space is formed, and the inside and outside communicate with each other via a front opening 20 and a rear opening (not shown) on the tail side.
The front cylinder portion 10 is formed by integrally forming a small-diameter tubular front cylinder tip portion 10a located on the tip side and a large-diameter tubular front cylinder rear end portion 10b located on the tail side. That is, the outer peripheral surface of the front cylinder tip portion 10a and the outer peripheral surface of the front cylinder rear end portion 10b are continuous via a step.

The front cylinder tip portion 10a is a portion that is inserted inside the cap member 3 when the cap member 3 (see FIG. 1) is attached.
As shown in FIG. 3, four rib portions 21 are formed on the inner peripheral surface of the front cylinder tip portion 10a on the tip side. Each of the four rib portions 21 is a substantially rectangular parallelepiped portion, has a substantially rectangular cross-sectional shape, and extends in the front-rear direction.
The four rib portions 21 are formed at positions separated from each other in the circumferential direction of the front cylinder tip portion 10a. Specifically, one rib portion 21 is formed at a position separated from the other rib portion 21 in the circumferential direction by about 90 degrees.

Further, on the inner peripheral surface of the rear end portion 10b of the front cylinder, a female screw portion 23 (not shown in FIG. 3, see FIG. 17) is formed on the tail side portion.

As shown in FIG. 2, the rear tubular portion 11 is a hollow member in which a space is formed, and more specifically, the rear tubular portion 11 has a bottomed tubular shape in which the internal space is continuous with the outside through the tip opening 25. It is a member of.
The front end side portion of the rear side cylinder portion 11 is thinner than the rear end side portion, and a male screw portion 26 is formed on the outer peripheral surface of the front end side portion. The male threaded portion 26 forms an engaging portion paired with the female threaded portion 23 of the front tubular portion 10 (not shown in FIG. 2, see FIG. 17), and the male threaded portion 26 is one of them. That is, the brush shaft 30 (see FIG. 1) is formed by inserting the tip end side portion of the rear side cylinder portion 11 into the rear end side portion of the front side cylinder portion 10 and screwing the female screw portion 23 and the male screw portion 26. It is formed.

The rear cylinder portion 11 is formed of a flexible member, and is a portion in which a liquid such as water (water in the present embodiment) is stored.
That is, in the brush tool 1 of the present embodiment, water can be supplied to the brush ear 14 by the user picking and pushing the rear cylinder portion 11 (details will be described later).

The water supply regulation member 12 is formed of a porous material that can be impregnated with a liquid, and has water absorption and water retention. The water supply regulation member 12 of the present embodiment is formed from a urethane resin sponge as a raw material. As shown in FIG. 2, the water supply regulating member 12 is formed so as to have a tubular shape, and is provided with a fixing member insertion hole 12a penetrating from the front end to the rear end.

As shown in FIGS. 4 and 5, the brush ear attachment 13 is a member that extends in a predetermined direction (front-back direction) with a width, and is a hollow member having a space inside.
The brush tip attachment 13 is a member in which a spike-shaped holding portion 35 on the tip side and a tip introduction portion 36 on the rear end side are integrally formed. The brush tip attachment 13 is formed with a brush tip attachment hole 37 that penetrates from the front end side to the rear end side.

In the following description, the brush ear attachment 13 will be described with reference to the posture shown in FIG. That is, unless otherwise specified, one side of the peripheral wall (upper side in FIG. 4) is the upper side, and the opposite side (lower side in FIG. 4) is the lower side.

As shown in FIG. 4, two engaging surface portions 45, a first water supply hole portion 46, and a water supply groove portion 47 are formed on the upper portion of the brush ear attachment 13.

Here, the brush ear attachment 13 of the present embodiment is a member in which the upper portion and the lower portion are plane-symmetrical. That is, the upper half and the lower half of the brush tip attachment 13 are plane-symmetrical with a virtual plane extending including the central portion in the vertical direction as a symmetrical plane.
Therefore, two engaging surface portions 45, a first water supply hole portion 46, and a water supply groove portion 47 are formed on the lower portion of the brush tip attachment 13 as well as the upper portion (not shown in FIG. 4). Similarly, each portion formed in the upper portion is also formed in the lower portion.
In the following description, only the upper portion of the brush ear attachment 13 will be described in detail, and the overlapping detailed description of each lower portion will be omitted.

The spike-shaped holding portion 35 is a portion having a flat overall shape and extending in the front-rear direction.
The spike-shaped holding portion 35 is formed with side wall portions 50 at both ends in the width direction (left-right direction). The outer surface of the side wall portion 50 is a curved surface that is curved so as to bulge outward in the width direction. The two side wall portions 50 are formed so as to be separated from each other. Therefore, the width direction referred to here is also the opposite direction of the two side wall portions 50.

The engaging surface portion 45 is a surface that is continuous with the upper end portion of the side wall portion 50 and is orthogonal (intersects) with the vertical direction. The engaging surface portion 45 is formed from the center in the width direction with respect to the upper end of the side wall portion 50. That is, the engaging surface portion 45 is a surface that spreads in the width direction and the front-rear direction, and extends in the front-rear direction at a position adjacent to the upper end portion of the side wall portion 50.

As shown in FIGS. 4 and 6, the first water supply hole portion 46 is a through hole having a substantially rectangular opening shape, and penetrates the upper portion of the spike-shaped holding portion 35 in the vertical direction (ear-shaped holding). It is a through hole (penetrating a part of the peripheral wall of the portion 35). That is, as shown in FIG. 5, the first water supply hole portion 46 is a hole that communicates with the brush ear attachment hole 37 (inside the brush ear attachment 13) and the outside.

As shown in FIGS. 4 and 6, the first water supply hole portion 46 extends from the rear end portion of the spike-shaped holding portion 35 toward the tip end side (from the right end portion to the left side in FIG. 6), and has a total length ( The length in the anteroposterior direction) is about 70% of the total length of the spike-shaped holding portion 35. That is, the first water supply hole portion 46 extends over most of the upper portion of the spike-shaped holding portion 35.

The opening portion of the first water supply hole portion 46 has a tip end side portion located between the two ridge portions 52.
As shown in FIG. 5, the ridge portion 52 projects upward and has a substantially fan-shaped cross section extending in the front-rear direction. That is, the ridge portion 52 is a portion adjacent to the outside in the width direction and a portion protruding upward from the portion adjacent to the rear side (a portion protruding upward from the formation position of the engaging surface portion 45). .. The ridge portion 52 has a curved surface between an upper end portion located on the center side in the width direction and a lower end portion located on the outer side in the width direction.
Then, the curved surface of the ridge portion 52, the engaging surface portion 45, and the outer surface of the side wall portion 50 form a stepped portion that is continuous in a stepped manner.

As shown in FIG. 7, the brush ear attachment 13 of the present embodiment is provided with a constriction portion 55 on the rear side of the ridge portion 52. The constricted portion 55 is a portion formed thinner than the adjacent portion adjacent in the front-rear direction. That is, the cross-sectional shape of the constricted portion 55 is such that the area of the minimum inclusion circle including the cross-section is smaller than the cross-sectional shape of the adjacent portion adjacent in the front-rear direction.
The constricted portion 55 of the present embodiment is a portion having a shorter length in the vertical direction than an adjacent portion adjacent in the front-rear direction.

As shown in FIGS. 4 and 7, the tip introduction portion 36 is a portion formed by integrally forming the rear large cylinder portion 58 and the front small cylinder portion 59.

As shown in FIGS. 4 and 5, the rear large cylinder portion 58 is a substantially cylindrical portion, and in detail, has a shape in which a part of the side surface is cut off vertically. That is, as shown in FIG. 5, the side surface (outer peripheral surface) of the rear large cylinder portion 58 is formed with a curved surface continuous in the circumferential direction and a substantially rectangular flat surface.

The front small cylinder portion 59 is a tubular portion having a shorter vertical length and a shorter width direction than the rear large cylinder portion 58. The front small cylinder portion 59 extends forward from the front end surface of the rear large cylinder portion 58, and its side surface (outer peripheral surface) portion is continuous with the side surface (outer peripheral surface) portion of the rear large cylinder portion 58 via a step. ..
The water supply groove portion 47 described above is formed on the side surface (outer peripheral surface) of the front small cylinder portion 59.

The water supply groove portion 47 is a groove portion extending in the front-rear direction, and the front end side portion is located between two rib portions 60 (protruding portions) separated and opposed in the width direction.
The rib portion 60 is a portion that protrudes upward from other portions adjacent in the width direction, and is a vertical wall-like portion that extends in the front-rear direction. In the present embodiment, the front small cylinder portion 59 extends from the front end to the rear side.

As shown in FIG. 8, the bottom portion of the water supply groove portion 47 is provided with a groove bottom inclined portion 63, a groove bottom protrusion 64, and a second water supply hole portion 65, respectively, in order from the front end side.

The groove bottom inclined portion 63 is a portion in which the upper surface thereof is inclined so as to be directed downward toward the front end side. That is, the outer surface in the vertical direction forms an inclined surface that inclines toward the central side in the vertical direction toward the front end side.

The groove bottom protrusion 64 is a substantially rectangular parallelepiped portion adjacent to the rear side of the groove bottom inclined portion 63, and is a portion protruding upward (outside in the vertical direction) from the rear end of the groove bottom inclined portion 63. The upper surface of the groove bottom protrusion 64 is continuous with the upper surface of the groove bottom inclined portion 63 via a step.

The second water supply hole portion 65 is a through hole having a substantially square opening shape, and is a through hole that penetrates the front small cylinder portion 59 (tip introduction portion 36) in the vertical direction. That is, it is a hole that communicates with the brush tip mounting hole 37 (inside the brush tip mounting tool 13) and the outside.

Subsequently, the internal structure of the brush ear attachment 13 (brush ear attachment hole 37) will be described in detail.

As shown in FIG. 9, the brush tip mounting hole 37 has a series of through holes in which the tip introduction portion 70, the shape deformation portion 71, and the tip side shaping portion 72 are continuously formed from the rear end side.

As shown in FIGS. 5 and 10, the tip introduction portion 70 includes a hole rear portion 70a having a large hole diameter (large cross-sectional area) and a hole front portion 70b having a small hole diameter (small cross-sectional area). It is formed continuously.
Here, on the inner peripheral surface of the tip introduction portion 36, a portion surrounding the hole rear portion 70a in the circumferential direction and a portion surrounding the hole front portion 70b in the circumferential direction are continuous via a step. In other words, inside the tip introduction portion 36, the surfaces adjacent to the outside of each portion of the tip introduction portion 70 are continuous in a stepwise manner in the front-rear direction.

That is, the tip introduction portion 70 is a hole that gradually becomes smaller toward the tip side.
Here, the "hole that gradually becomes smaller" is a hole whose cross-sectional area becomes smaller intermittently (intermittently). That is, as the cross-sectional area becomes substantially the same toward the tip end side of the hole, the cross-sectional area becomes apparently smaller after a certain amount or more, and then the cross-sectional area becomes substantially the same. The hole is such that the same part continues for a certain amount or more.

The tip introduction portion 70 has a circular opening shape at the rear end portion of the tip introduction portion 70, and the cross-sectional shape of each portion is circular.

Further, in the inner peripheral surface of the tip introduction portion 36, the inner opening of the second water supply hole portion 65 described above is formed in the portion surrounding the hole front portion 70b (see FIG. 5). That is, the second water supply hole portion 65 is a hole that communicates with the front portion 70b of the hole and the outside.

As shown in FIG. 10, the shape deforming portion 71 has an elliptical shape at the rear end opening.
That is, the shape is different from both the opening shape (cross-sectional shape) of the rear end portion of the tip introduction portion 70 and the cross-sectional shape of the front end portion. The opening area of the rear end opening of the shape deforming portion 71 (the area of the cross section of the rear end portion) is smaller than the area of the cross section of the front end portion of the tip introduction portion 70.
From the above, on the inner peripheral surface of the tip introduction portion 36, a portion surrounding the tip introduction portion 70 in the circumferential direction and a portion surrounding the shape deformation portion 71 in the circumferential direction are continuous via a step. In other words, inside the tip introduction portion 36, the surface adjacent to the outside of the tip introduction portion 70 and the surface adjacent to the outside of the shape deformation portion 71 are continuous in a stepwise manner in the front-rear direction.

As described above, the shape deforming portion 71 is a hole that becomes continuously smaller toward the tip end side.
Here, the "continuously smaller hole" is a hole in which the area of the cross section of each continuous portion is gradually reduced.

In the present embodiment, the shape of the cross section of each portion of the shape deforming portion 71 is substantially elliptical.
The term "substantially elliptical" as used herein is not limited to a perfect ellipse, but includes a shape similar to an ellipse. That is, it is a shape having an orthogonal minor axis length and a major axis length, and if it is generally elliptical, the shape of the curved portion may be partially extended irregularly. For example, the oval shape is included in the "substantially elliptical shape".

More specifically, as shown in FIG. 11, the shape deformed portion 71 has an elliptical cross-sectional shape at the rear end portion (see FIG. 11A), and the cross-sectional shape at the front end portion has a shape. It has an oval shape. Then, the shape of the cross section gradually changes from an elliptical shape to an oval shape toward the tip side. That is, the cross-sectional shape gradually shifts to a flat shape toward the tip side.

Therefore, the width direction length (major axis length Lα) of the cross section is substantially the same in each portion in which the positions of the shape deformation portions 71 in the front-rear direction are different. On the other hand, the vertical length (minor axis length Lβ) of the cross section gradually becomes shorter toward the tip side (front side). More specifically, the upper end portion gradually becomes a lower position and the lower end portion gradually becomes a higher position toward the tip side.
Therefore, each of the upper end portion and the lower end portion of the cross section gradually becomes closer to the center in the vertical direction toward the tip end side.

Here, the width direction and the vertical direction are both the radial direction of the tip introduction portion 70 (see FIGS. 5 and 10), are parallel to the cross section of the brush tip mounting hole 37, and are orthogonal to each other. Is. The width direction and the vertical direction are one of the directions orthogonal to the central axis of the tip introduction portion 70 (brush tip mounting hole 37) (first direction) and the other one (second direction). But also.

The first water supply hole 46 and the second water supply hole 65, which are through holes communicating with the outside, are not located in the portion of the tip introduction portion 36 that surrounds the shape deformation portion 71 in the circumferential direction (see FIG. 4). ). That is, the shape-deforming portion 71 is a space surrounded by an inner peripheral surface that is continuous with the outside at the front-rear end and is circularly continuous in the circumferential direction over the entire area in the front-rear direction.

As shown in FIG. 9, the tip-side shaping portion 72 is a portion that is continuous with the front end portion of the shape deforming portion 71 and extends to the front end portion of the brush ear mounting hole 37.

As shown in FIG. 12, the shape of the cross section of each portion of the tip-side shaping portion 72 is substantially elliptical (oval shape).
That is, in the rear end side portion of the tip side shaping portion 72, the shape of the cross section, that is, the shape of the inner peripheral surface of the spike-shaped holding portion 35 and the portion surrounded by the two first water supply holes 46 is substantially elliptical. (See FIG. 12 (a)). On the other hand, in the front end side portion, the shape of the portion surrounded by the inner peripheral surface which is the inner peripheral surface of the spike-shaped holding portion 35 and which is continuous in a ring shape in the circumferential direction is substantially elliptical (see FIG. 12B). ).

The shape of the cross section of the tip-side shaping portion 72 is substantially the same, and in detail, it is substantially the same as the opening shape of the front end portion of the shape deforming portion 71.
That is, the width direction length (major axis length Lα) of the cross section of the tip-side shaping portion 72 is substantially the same as the width direction length of the cross section of the front end portion of the shape deformation portion 71. In addition, the vertical length (minor axis length Lβ) of the cross section of the tip-side shaping portion 72 is substantially the same as the vertical length of the cross section of the front end portion of the shape deforming portion 71. ..

Here, as described above, in the tip-side shaping portion 72, the length in the width direction of the cross section is substantially the same over the entire area in the front-rear direction (see FIG. 12 and the like).
Therefore, as shown in FIG. 13, between the rear end (right end in FIG. 13) of the tip-side shaping portion 72 and the front end (left end in FIG. 13) of the tip-side shaping portion 72 (brush tip mounting hole 37). The length in the width direction (the length in the vertical direction in FIG. 13) of the brush ear mounting hole 37 is the same.

Here, as shown in FIG. 13, the shape deforming portion 71 is formed on the rear end side portion (right end side portion in FIG. 13) of the brush ear attachment 13 (brush ear attachment hole 37).
That is, the shape deforming portion 71 is formed in the range from the rear end to the central portion in the front-rear direction (longitudinal direction, left-right direction in FIG. 13) of the brush ear mounting hole 37. This range extends from the rear end of the brush tip mounting hole 37 to a portion separated by L1 / 2 (50% of the total length L1) when the total length of the brush tip mounting hole 37 (brush tip mounting tool 13) is L1. It is also the range of.

The range in which the shape deformed portion 71 is formed is a range from the rear end of the brush tip mounting hole 37 to a portion separated by a distance (length) of 50% or less of the total length L1, and 40% of the total length L1. It is preferable that the range is up to a portion separated by the following distance (length).
In addition, the range is more preferably separated by a distance (length) of 35% or less of the total length L1, and further preferably the range is separated by a distance (length) of 30% or less of the total length L1. ..

In the present embodiment, the shape deforming portion 71 is formed in a range from the rear end of the brush ear mounting hole 37 to a portion separated by a length of 28% of the total length L1. That is, the total length of the front-rear length L2 of the tip introduction portion 70 and the front-rear length L3 of the shape deforming portion 71 is 28% of the total length L1 of the brush tip attachment hole 37.

In the present embodiment, the length (overall length) L4 of the spike-shaped holding portion 35 in the front-rear direction is sufficiently longer than the length of the shape-deforming portion 71 in the front-rear direction.
Here, the length L4 of the spike-shaped holding portion 35 in the front-rear direction is preferably 1.5 times or more, more preferably 2.5 times or more, of the length L3 of the shape deforming portion 71 in the front-rear direction. It is preferable, and more preferably 3 times or more. In the present embodiment, the length L4 is about 3.3 times as long as the length L3.

Further, the length L4 in the front-rear direction of the spike-shaped holding portion 35 is longer than the total length of the length L2 in the front-rear direction of the tip introduction portion 70 and the length L3 in the front-rear direction of the shape deforming portion 71. Specifically, the length L4 is more than twice as long as the total length of the length L2 and the length L3, and in the present embodiment, it is about 2.4 times longer.

As shown in FIG. 2, the brush ear 14 is formed by bundling hair materials into a hair bundle and heat-welding the rear end portion. From this, the brush ear 14 has a hair bundle portion 14a forming most of the front side and a flange-shaped portion 14b (solid portion) forming a part around the rear end, and the flange-shaped portion 14b , It is a part formed by solidifying after a part of the hair bundle is melted.

The hair bundle portion 14a is a portion in which hairs are bundled so that the overall shape in the natural state (state in which no external force is applied) is substantially columnar, and extends in the front-rear direction while projecting forward from the front end of the flange-shaped portion 14b. It is a part.
The flange-shaped portion 14b is a substantially disk-shaped portion having a substantially circular shape when viewed from the rear. The flange-shaped portion 14b has a radial length longer than the radial length of the hair bundle portion 14a, and the radial center is located on the same straight line as the radial center of the hair bundle portion 14a. ..
That is, the flange-shaped portion 14b is a portion having a large diameter (thickly formed portion) in the entire brush ear 14, and the outer peripheral edge portion of the flange-shaped portion 14b is in the radial direction with respect to the outer peripheral portion of the hair bundle portion 14a. Located on the outside.

As the hair material used for the brush ear 14, animal hair (natural hair) such as horse or sheep may be used, or artificial hair using synthetic resin fibers or the like may be used. You may adopt the one which mixed the hair.

As shown in FIG. 14, the inner plug member 15 has a structure including an inner plug main body portion 75 and a water supply regulation plug portion 76.

The inner plug main body 75 is formed with a liquid passage hole 78 that penetrates from the front end to the rear end. Further, the inner plug main body 75 has a large diameter portion 75a having a larger diameter than the tip opening 25 (see FIG. 2) of the rear cylinder portion 11 and a small diameter portion 75b located on the most tip side (front side). Has.
On the outer peripheral surface of the front side portion of the inner plug main body portion 75, each portion having a different diameter is formed continuously in a stepped manner, and the diameter decreases toward the front. In other words, the front side portion of the inner plug main body portion 75 has a shape that tapers in a stepped manner.

The small diameter portion 75b of the stopper is a portion having a substantially cylindrical shape, and a side hole portion 80 is provided on a part of the outer peripheral surface. The side hole portion 80 is a through hole that penetrates from a part of the outer peripheral surface to a part of the inner peripheral surface of the plug small diameter portion 75b. In the present embodiment, two side hole portions 80 are formed and face each other in the radial direction of the plug small diameter portion 75b.
That is, the front side portion of the liquid passage hole 78 communicates with the outside through the front side opening portion 81 located at the front end of the plug small diameter portion 75b (inner plug main body portion 75) and the two side hole portions 80. Therefore, the side hole portion 80 is a hole that is continuous with the liquid passage hole 78 and extends in a direction orthogonal to the front-rear direction.

The inner plug main body 75 has an insertion tube portion 75c extending in the front-rear direction, and a part of the insertion tube portion 75c is located on the rear side of the plug large diameter portion 75a. A part of the insertion cylinder portion 75c is a portion to be inserted into the rear cylinder portion 11 at the time of attachment, and is also a portion surrounding the rear end portion of the liquid passage hole 78.

The water supply regulation plug portion 76 is a member having a substantially columnar outer shape, and the front side portion is fitted into the rear end side portion of the liquid passage hole 78. That is, the water supply regulation plug portion 76 has a radial length substantially the same as the radial length of the liquid passage hole 78, and the front portion is inserted into the rear portion of the liquid passage hole 78, and the rear portion is inserted. The side part is exposed to the outside.

The water supply regulation plug portion 76 is a round bar-shaped member made of plastic (synthetic resin), which has higher rigidity than cotton, sponge, etc., and has fine through holes penetrating from the front end surface to the rear end surface. Many are formed (not shown).

Next, the assembly structure of the brush 1 will be described.

When assembling the brush main body 2, as shown in FIGS. 2 and 15, the brush ear 14 is inserted from the rear of the brush ear attachment 13 and the brush ear 14 is attached to the brush ear attachment 13. To do.
Further, as shown in FIGS. 2 and 16, the brush ear attachment 13 is inserted from the rear side of the water supply regulation member 12, and the water supply regulation member 12 is in a state where a part of the brush ear attachment 13 is externally fitted. ..
Then, the brush tip attachment 13 to which the water supply regulating member 12 and the brush tip 14 are attached is inserted from the rear side of the front side tubular portion 10. Further, as shown in FIG. 17, after the inner plug member 15 is positioned on the rear side of the brush tip attachment 13, the female screw portion 23 of the front cylinder portion 10 and the male screw portion 26 of the rear cylinder portion 11 It is screwed so that the brush body 2 is assembled.

That is, as shown in FIG. 17, the water supply regulating member 12, the brush tip attachment 13 and most of the brush spikes 14, and the inner plug member 15 are housed inside the front cylinder portion 10. Then, as shown in FIGS. 1 and 17, the tip-side portion of the brush tip attachment 13 and the brush tip 14 is in a state of protruding outward from the tip opening 20 of the front tubular portion 10.

At this time, as shown in FIG. 18, the rib portion 21 of the front tubular portion 10 and the engaging surface portion 45 are in contact with each other, or are arranged at positions slightly spaced apart in the circumferential direction of the writing shaft 30. (In this embodiment, they are arranged at intervals). That is, at least a part of the brush tip attachment 13 is arranged at a position separated from the side surface of the rib portion 21 in the circumferential direction of the front tubular portion 10 (brush shaft 30). The rib portion 21 and the engaging surface portion 45 form a detent portion, and when the brush tip attachment 13 tries to rotate relative to the front cylinder portion 10, they come into contact with each other. Rotation is blocked.

Here, when the brush ear 14 is attached to the brush ear attachment 13, the brush ear 14 is inserted from the rear of the brush ear attachment 13 as described above (see FIG. 15).
At this time, as shown in FIG. 15, the radial length of the hair bundle portion 14a in the natural state is smaller than the radial length of the hole rear portion 70a and the hole front portion 70b of the tip introduction portion 70. That is, in the cross section of the hair bundle portion 14a in the natural state, the area of the minimum inclusion circle including the cross section is smaller than the area of the cross section of the hole rear portion 70a, and is smaller than the cross section area of the hole front portion 70b. Also becomes smaller. That is, the hair bundle portion 14a is thinner than the tip introduction portion 70, and can be easily introduced into the tip introduction portion 70.

Further, as shown in FIGS. 15 (b) and 19, the radial length of the hair bundle portion 14a in the natural state is the major axis length Lα of the cross section near the rear end and the rear end of the shape deformed portion 71. , The minor axis length Lβ (see FIG. 11A) is shorter.
That is, in the cross section of the hair bundle portion 14a in the natural state, the area of the minimum inclusion circle including the cross section is smaller than the area of the cross section of the rear end and the vicinity of the rear end of the shape deforming portion 71.
Therefore, when the tip portion of the hair bundle portion 14a is moved from the tip introduction portion 70 to the shape deformation portion 71, the hair bundle portion 14a can be easily introduced into the shape deformation portion 71.

Then, as described above, the shape deforming portion 71 has a shape in which the cross-sectional shape gradually becomes flatter (approaches the oval shape) toward the tip side (see FIG. 11 and the like). Therefore, in the hair bundle portion 14a, the cross-sectional shape of the portion that has passed through the inside of the shape deforming portion 71 (the portion that has moved to the tip side from the tip side opening of the shape deforming portion 71) is before being inserted into the shape deforming portion 71. The shape is different from the cross-sectional shape of.

That is, since the vertical length of the shape deforming portion 71 gradually shortens toward the tip side, each portion of the hair bundle portion 14a is gradually pushed from the vertical direction as it passes through the inside of the shape deforming portion 71. It approaches the flat shape.

Then, as shown in FIGS. 15 (b) and 15 (c), the tip portion of the hair bundle portion 14a is introduced into the tip side shaping portion 72 after passing through the shape deforming portion 71, and the tip side shaping portion 72 is introduced. After passing through, the brush tip attachment hole 37 moves to the outside through the front end side opening.

Here, the tip portion of the bristles portion 14a located outside the brush ear attachment hole 37 may be shaped so that the bristles portion serving as the brush tip is tapered (see FIGS. 17, 18, etc.). That is, the hair tip portion of the hair bundle portion 14a is impregnated with water or the like, and a force is gradually applied along the flow of the hair toward the tip so that the thickness becomes thinner toward the hair tip side. You may shape it.
The hair tip portion may be shaped before assembling, that is, before inserting the brush ear 14 into the brush ear attachment 13. Further, the shape may be adjusted after assembling, that is, after inserting the brush ear 14 into the brush ear attachment 13. However, from the viewpoint of making it easier to insert the brush tip 14 into the brush tip attachment 13, it is preferable to arrange the shape before assembling.
In this case, the tip portion of the brush ear 14 (see FIG. 2) is adjusted so that the thickness becomes thinner toward the tip of the hair.

Further, when the hair bundle portion 14a is moved forward relative to the brush tip attachment 13, the flange-shaped portion 14b comes into contact with the portion adjacent to the rear end opening of the shape deforming portion 71 (FIG. 15 (FIG. 15). c) See). This prevents the hair bundle portion 14a from moving further forward.
That is, the flange-shaped portion 14b is inserted into the shape deforming portion 71 so that at least one side length in the radial direction (vertical length in FIG. 15) is longer than the length in the same direction of the rear end opening in the shape deforming portion 71. It is a size that cannot be done.

As described above, in the present embodiment, the flange-shaped portion 14b is arranged on the rear side of the rear end opening of the shape deforming portion 71, and the rear end side portion of the hair bundle portion 14a located on the front side of the flange-shaped portion 14b is deformed. It is arranged inside the part 71.
More specifically, the flange-shaped portion 14b is in a state of being adjacent to the rear side of the rear end opening of the shape deforming portion 71. Then, the root portion of the hair bundle portion 14a adjacent to the flange-shaped portion 14b, that is, the rear end portion of the hair bundle portion 14a and the portion adjacent to the front thereof are housed inside the shape deforming portion 71.

In the present embodiment, the total length (length in the front-rear direction) L5 of the brush ear 14 is longer than the total length L1 of the brush ear attachment 13 and the brush ear attachment hole 37.
Further, when the brush ear 14 is attached to the brush ear attachment 13, the length L6 of the portion of the brush ear 14 located inside the brush ear attachment 13 is located outside the brush ear attachment 13. The length is longer than the length of L7.
In this way, if most of the brush ears 14 are flattened inside the brush ears attachment 13, the tip of the brush ears exposed to the outside of the brush ears attachment 13 is hard to crack (the shape is hard to collapse). Become.

Here, as shown in FIG. 20, inside the spike-shaped holding portion 35, the cross-sectional area (area excluding the gap portion) of the hair bundle portion 14a (brush ear 14) housed inside is the brush. It is less than or equal to the area of the cross section of the ear mounting hole 37.
The area of the cross section of the bristles 14a is preferably 50% or more of the area of the cross section of the brush tip attachment hole 37 from the viewpoint of more reliably preventing the tip of the brush from losing its shape. Further, it is more preferably 60% or more, and further preferably 70% or more of the cross-sectional area of the brush ear attachment hole 37.

Subsequently, when attaching the water supply regulating member 12 to the brush ear attachment 13, the brush ear attachment 13 is inserted from the rear side of the water supply regulating member 12 as described above (see FIGS. 2 and 16). The water supply regulating member 12 may be attached after the brush tip 14 is attached to the brush tip attachment 13 or before the brush tip 14 is attached to the brush ear attachment 13.

Specifically, the brush tip attachment 13 is inserted into the fixing member insertion hole 12a (see FIG. 2) of the water supply regulation member 12.
The water supply regulation member 12 is attached so as to surround the constricted portion 55 of the brush ear attachment 13 or the constricted portion 55 and a portion adjacent to the front side thereof.
In this embodiment, the water supply regulation member 12 is attached to the constricted portion 55 (see FIG. 16). That is, as shown in FIG. 16B, with the water supply regulating member 12 attached to the brush ear attachment 13, the water supply regulating member 12 and the front end portion of the constriction 55 are at the same position in the front-rear direction. It becomes. At the same time, the water supply regulating member 12 and the rear end portion of the constricted portion 55 are also positioned at the same position in the front-rear direction.

Here, the rib portion 60 of the brush ear attachment 13 is also a portion that functions as a movement restricting portion that prevents the position shift of the water supply regulating member 12.
More specifically, the tip introduction portion 36 has rib portions 60 formed at positions separated in the vertical direction, and a part of the front end side portion in the vertical direction is longer than the periphery. Then, when the water supply regulation member 12 tries to move relatively rearward from the mounting position, the rear end portion of the water supply regulation member 12 comes into contact with the front end portion of the rib portion 60, and the water supply regulation member 12 is caught by the rib portion 60. As a result, the water supply regulating member 12 is prevented from moving to the rear side.
That is, the front end side portion of the tip introduction portion 36 has a size that cannot be inserted into the fixing member insertion hole 12a. In other words, the rear end side opening of the fixing member insertion hole 12a (see FIG. 2) has a vertical length when attached to the brush tip attachment 13 so that the rib portion 60 of the tip introduction portion 36 is formed. It is shorter than the vertical length.

Further, as described above, the brush tool 1 of the present embodiment is obtained by the user picking and pressing the rear side portion of the brush shaft 30 (the portion of the rear side cylinder portion 11 exposed to the outside) and pressing the brush tip. It is possible to supply water to 14 (details will be described later).

That is, when the user pushes the rear cylinder portion 11, as shown in FIG. 21, the liquid (water) contained in the rear cylinder portion 11 passes through the water supply regulation stopper portion 76 and the inner stopper member. It flows into the liquid passage hole 78 of 15. Then, it flows out from the front end side portion of the liquid passage hole 78 to the outside of the inner plug member 15.
Specifically, since the front end side portion of the inner plug member 15 is inserted into the rear end side portion of the brush ear attachment 13, the liquid flows from the inside of the inner plug member 15 to the inside of the brush ear attachment 13. ..

Since the rear end opening of the shape deforming portion 71 is closed by the flange-shaped portion 14b of the brush scion 14, the liquid flows from the second water supply hole portion 65 to the outside of the brush scion attachment 13 and the water supply groove portion. After passing through 47, the water supply regulating member 12 is squeezed.
Further, when the liquid enters the water supply regulating member 12 beyond the water retention limit, the liquid is supplied from the water supply regulating member 12 to the hair bundle portion 14a of the brush ear 14 via the first water supply hole portion 46.

That is, the water supply regulation plug portion 76 having a plurality of through holes and the water supply regulation member 12 capable of impregnating the liquid regulate the supply amount of the liquid to the brush ear 14, the first liquid supply regulation member and the second. Functions as a liquid supply regulation member.
Further, two side hole portions 80 are formed in the front end portion of the inner plug member 15 (see FIG. 14). Therefore, even if the brush tip 14 moves to the rear end side and the front opening 81 of the inner plug member 15 is blocked by the flange-shaped portion 14b, the liquid can flow out from the side hole 80 to the outside.

Further, the first water supply hole portion 46 and the second water supply hole portion 65 are holes (liquid supply holes) for liquid supply through which the liquid passes when the liquid (water) is supplied to the brush ear 14. The water supply groove portion 47 adjacent to the second water supply hole portion 65 (see FIG. 4 and the like) functions as a distribution path (liquid supply groove) for the liquid flowing out from the second water supply hole portion 65.

1 Brush (applying tool)
12 Water supply regulation member (liquid supply regulation member)
13 Brush ear attachment 14 Brush ear 14a Hair bundle part 14b Flange-shaped part (solid part)
30 Brush shaft 37 Brush ear mounting hole 60 Rib part (protruding part)
70 Tip introduction part 71 Shape deformation part 72 Tip side shaping part

Claims

In a coating tool having a brush tip and a brush shaft and attaching the brush tip to the brush shaft via a brush tip attachment tool,
The brush ear attachment has a brush ear attachment hole through which the brush ear is inserted.
The brush ear attachment hole extends from the tail side to the tip side.
A part of the brush tip mounting hole is a shape deforming portion that deforms the shape of the brush tip inserted from the tail side.
The shape-deformed portion is a portion where the area of the cross section decreases toward the tip side, at least in the tip side portion.
When the total length of the brush tip mounting hole is L1, the shape-deformed portion is formed in a range from the rear end of the brush tip mounting hole to a portion separated by L1 / 2. Applying tool.
At least a part of the brush ear mounting hole is formed with a tip-side shaping portion and the shape deforming portion continuously.
The tip-side shaping portion is a portion located on the tip end side of the shape-deforming portion and having substantially the same cross-sectional area and shape of each portion.
The coating tool according to claim 1, wherein the tip-side shaping portion has a length in the direction from the tail side to the tip side, which is 1.5 times or more longer than the length in the same direction of the shape deformation portion. ..
The brush tip has a longer length in the direction from the tail side to the tip side than the portion of the brush tip located inside the brush tip attachment that protrudes outward from the tip portion of the brush tip attachment. The coating tool according to claim 1 or 2.
A part of the brush tip mounting hole is formed with the shape deformation portion and the tip introduction portion continuously.
The tip introduction portion is located on the tail side of the shape deformation portion, and the area of the cross section gradually decreases toward the tip side.
The area of the cross section of the tail side portion of the shape deformation portion is equal to or less than the area of the cross section of the front end side portion of the tip introduction portion.
The coating tool according to any one of claims 1 to 3, wherein at least the tip side portion of the shape deforming portion is a portion in which the area of the cross section continuously decreases toward the tip side.
The brush ear has a hair bundle portion located on the tip side and a solid portion forming the rear end portion.
The coating tool according to any one of claims 1 to 4, wherein the rear end side portion of the hair bundle portion is located inside the shape deforming portion.
Liquid can be supplied to the brush spike from the inside of the brush shaft.
Further having a liquid supply regulating member for regulating the flow of the liquid,
The liquid supply regulating member is attached so as to cover a part of the brush ear attachment from the outside.
The brush ear attachment is provided with a ridge portion on the outer surface that protrudes from the surroundings.
The coating tool according to any one of claims 1 to 5, wherein the ridge portion regulates the relative movement of the liquid supply regulating member with respect to the brush ear attachment.
A brush tip attachment tool for attaching the brush tip to the brush shaft.
It has a brush ear attachment hole through which the brush ear is inserted,
The brush ear attachment hole extends from the tail side to the tip side.
A part of the brush tip mounting hole is a shape deforming portion that deforms the shape of the brush tip inserted from the tail side.
The shape-deformed portion is a portion where the area of the cross section decreases toward the tip side, at least in the tip side portion.
When the total length of the brush tip mounting hole is L1, the shape-deformed portion is formed in a range from the rear end of the brush tip mounting hole to a portion separated by L1 / 2. Brush ear attachment.