Cushion brush

Abstract

To provide a cushion brush that can improve cushion property of a brush surface.SOLUTION: A cushion brush 10 includes a brush surface 30 and a base 20 for fixing the brush surface 30. The brush surface 30 includes: a surface part 32 including a plurality of bristles 31; and an inner surface part 33 installed on an inner side from the surface part 32. Both the surface part 32 and inner surface part 33 have elasticity. The surface part 32 and the inner surface part 33 are elastically deformable relatively to each other.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a cushion brush. [Background technology]

[0002] A hairbrush used for combing hair is known as an example of a conventional cushion brush. For example, the hairbrush described in Patent Document 1 below has bristles that protrude approximately perpendicularly from the brush surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-119869 A Summary of the Invention [Problem to be solved by the invention]

[0004] There was a demand for a better cushioning of the brush surface to soften the feel of the brush bristles on the scalp.

[0005] The present invention was completed in view of the above circumstances, and an object of the present invention is to provide a cushion brush that can improve the cushioning properties of the brush surface. [Means for solving the problem]

[0006] The cushion brush of the present invention has a brush surface having a plurality of brush bristles, the brush surface having a surface portion and an inner portion located inside the surface portion, both of which are elastic and capable of elastically deforming relative to one another. Effect of the Invention

[0007] With this configuration, the surface and inner surfaces are elastically deformed inward when subjected to an inward force, and attempt to return to their original state when the inward force is removed. The surface surface returns to its original state not only by its own elastic force, but also with the help of the inner surface which attempts to return to its original state. Therefore, the surface surface can be elastically deformed to a degree that it cannot return to its original state by its own elastic force alone, making the surface soft and improving the cushioning properties of the brush surface. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing a cushion brush in this embodiment. [Diagram 2] An exploded perspective view showing the cushion brush. [Diagram 3] FIG. 2 is a cross-sectional view showing the brush part, which corresponds to the cross section taken along the line AA in FIG. 1; [Figure 4] FIG. 2 is a cross-sectional view showing the brush unit, which corresponds to the cross-section taken along the line BB in FIG. 1; [Diagram 5] Front view showing the inner surface [Figure 6] Side view showing the inner surface [Figure 7] Plan view showing the inner surface DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A preferred embodiment of the present invention is described below. [1] The cushion brush of the present invention comprises a brush surface and a base for fixing the brush surface, the brush surface having a surface portion having a plurality of brush bristles and an inner surface portion provided inside the surface portion, the surface portion and the inner surface portion both having elasticity, and the surface portion and the inner surface portion are relatively elastically deformable. With such a configuration, the surface portion and the inner surface portion elastically deform inward when subjected to an inward force, and tend to return to their original state when the inward force is removed. The surface portion returns to its original state not only by its own elastic force, but also with the help of the inner surface portion which tends to return to its original state. Therefore, the surface portion can be elastically deformed to a degree that it cannot return to its original state by its own elastic force alone, so that the surface portion can be made soft, and the cushioning properties of the brush surface can be improved. [2] In the cushion brush described in [1] above, a gap may be formed between the surface portion and the inner surface portion when the surface portion and the inner surface portion are not elastically deformed. With this configuration, the surface portion elastically deforms independently in the initial stage when it receives an inward force, so that the ease of deformation of the brush surface can be ensured, and a soft feel can be achieved. [3] In the cushion brush according to any one of [1] to [2] above, a plurality of protrusions may be provided on at least one of the inner surface of the surface portion and the outer surface of the inner surface portion. With this configuration, the protrusions interposed between the surface portion and the inner surface portion can reliably secure a gap between the surface portion and the inner surface portion, thereby improving the cushioning properties of the brush surface. [4] In the cushion brush according to any one of [1] to [3] above, the inner surface may be formed with at least one opening. With this configuration, the inner surface can be made lighter and the feel of the cushion brush can be improved. [5] In the cushion brush according to any one of [1] to [4] above, the inner surface portion may have a plurality of elongated bridge portions, and the plurality of bridge portions may be formed by intersecting along the inner surface of the surface portion. With this configuration, the inner surface portion deforms along the extension direction of the bridge portions, so that a wide range of the inner surface portion can be easily deformed. [6] In the cushion brush described in [5] above, the bridges may cross each other to form a plurality of polygonal shapes. With this configuration, the inward force is distributed in a well-balanced manner along the bridges, so that the change in the amount of elastic deformation of the inner surface can be made to have a constant gradient. Therefore, the scalp can be massaged with a good feeling.

[0010] <Example> An embodiment of the present invention will be described in detail below with reference to Figs. 1 to 7. The cushion brush 10 in this embodiment is used for brushing human hair. As shown in Fig. 1, the cushion brush 10 includes a brush portion 11 and a handle portion 12. The brush portion 11 includes a base 20, a brush surface 30, and brush bristles 31. The handle portion 12 extends in one direction from the brush portion 11. A user holds the handle portion 12 in his / her hand, moves the brush portion 11, and brushes the hair with the brush bristles 31.

[0011] In the following description of each component, the side on which brush portion 11 is provided will be referred to as the upper side, the side on which handle portion 12 is provided as the lower side, the side on which brush bristles 31 are provided as the front side, the opposite side as the back side, the right side in Fig. 1 as the right side, and the left side as the left side. The boundary between brush portion 11 and handle portion 12 is a line (a line parallel to the X-axis) that extends perpendicularly to the longitudinal direction (direction parallel to the Y-axis) of cushion brush 10 at the constricted portion between brush portion 11 and handle portion 12. There are also cases where the side of brush portion 11 facing base 20 with respect to surface portion 32 as the reference is described as the inside, and the side opposite base 20 with respect to surface portion 32 as the reference is described as the outside.

[0012] In each diagram, the positive X-axis side is the right side, the negative X-axis side is the left side, the positive Y-axis side is the top side, the negative Y-axis side is the bottom side, the positive Z-axis side is the front side, and the negative Z-axis side is the back side. The X-axis is parallel to the left-right direction. The Y-axis is parallel to the up-down direction. The Z-axis is parallel to the front-back direction. "Parallel" includes a state where something is strictly parallel, as well as a state where it is roughly parallel. The up-down direction is unrelated to the direction of gravity.

[0013] As shown in Fig. 1, the handle portion 12 extends linearly downward from the brush portion 11. A cover 13 is attached to the handle portion 12. The cover 13 has multiple ridges extending in the vertical direction. The multiple ridges function to prevent the handle portion 12 from slipping when gripped.

[0014] 2, the base 20 is molded integrally with the handle portion 12. The base 20 and the handle portion 12 are made of, for example, ABS (Acrylonitrile butadiene styrene) resin. The base 20 has a brush surface 30 fixed thereto.

[0015] The brush surface 30 has a double cushion structure with a surface portion 32 and an inner surface portion 33. The surface portion 32 holds a plurality of brush bristles 31. Both the surface portion 32 and the inner surface portion 33 are formed from an elastic resin material. The surface portion 32 and the inner surface portion 33 are relatively elastically deformable. "Relatively elastically deformable" means that the inner surface portion 33 elastically bends when pushed by the surface portion 32 due to the elastic bending of the surface portion 32, and the elastic force of the inner surface portion 33 pushes back the surface portion 32.

[0016] As shown in Figures 3 and 4, the base 20 has a fixing recess 21 for fixing the brush surface 30. The fixing recess 21 is recessed into the surface side of the base 20. The peripheral portion of the brush surface 30 is fitted into the peripheral portion of the fixing recess 21. The peripheral portion of the brush surface 30 is joined to the peripheral portion of the fixing recess 21 by an adhesive (not shown). A silicone adhesive may be used as the adhesive. A space 22 is formed between the base 20 and the brush surface 30. The distance between the base 20 and the brush surface 30 in the front-back direction is largest at the center of the brush part 11 in the up-down and left-right directions.

[0017] An air hole 23 is formed in the base 20. The air hole 23 is provided at the upper end of the base 20. The air hole 23 communicates with the space 22 of the brush head 11 and the outside of the brush head 11. The air hole 23 penetrates the base 20 in the vertical direction. Air inside the brush head 11 is let in and out through the air hole 23.

[0018] As shown in Figures 3 and 4, the surface portion 32 is dome-shaped and bulges out toward the front side. The surface portion 32 is curved from the upper end to the lower end. The center of the surface portion 32 in the up-down direction is located closer to the front side than both ends of the surface portion 32 in the up-down direction. The surface portion 32 is curved from the left end to the right end. The center of the surface portion 32 in the left-right direction is located closer to the front side than both ends of the surface portion 32 in the left-right direction.

[0019] The material of the surface portion 32 may be rubber such as ethylene propylene rubber (EPDM). The surface portion 32 is in a sheet form. A large number of through holes for passing the brush bristles 31 are formed over the entire surface portion 32. The peripheral portion of the surface portion 32 constitutes the peripheral portion of the brush surface 30. The peripheral portion of the surface portion 32 is adhesively fixed to the base 20.

[0020] Due to the curvature of the brush surface 30, the tips of the brush bristles 31 are located on an imaginary curved surface. The imaginary curved surface formed by the tips of the brush bristles 31 bulges out furthest toward the front at the center of the brush surface 30. The center of the brush surface 30 is the center of the brush surface 30 in the up-down and left-right directions. When the brush surface 30 receives an inward force, it elastically deforms inward (toward the back side).

[0021] As shown in FIG. 4, the brush bristles 31 are pin-shaped. The tips (front side) of the brush bristles 31 are spherical to enhance the massage effect and not to injure the scalp. The brush bristles 31 have a tapered portion 31T and a spherical portion 31Q. The diameter of a cross section perpendicular to the extension direction of the tapered portion 31T is 1.6 mm to 1.3 mm. The tapered portion 31T is tapered toward the spherical portion 31Q in a direction perpendicular to the surface portion 32. The diameter of the cross section of the spherical portion 31Q is 1.9 mm. The cross section of the spherical portion 31Q is a cross section perpendicular to the extension direction of the tapered portion 31T of the spherical portion 31Q. The diameter of the cross section of the spherical portion 31Q is larger than the diameter of the cross section of the tapered portion 31T.

[0022] An antistatic agent is mixed into the brush bristles 31 to prevent static electricity from being generated during brushing. The brush bristles 31 are fixed to the surface portion 32. The brush bristles 31 pass through through holes formed in the surface portion 32. The brush bristles 31 are inserted into the through holes from the back side of the surface portion 32. Each brush bristles 31 has a retaining portion 34. The retaining portion 34 is disposed on the back side of the surface portion 32 and prevents the brush bristles 31 from falling out. The brush bristles 31 extend in a direction perpendicular to the surface portion 32. The length dimension of all the brush bristles 31 is approximately the same. The length dimension of the brush bristles 31 is 18 mm.

[0023] As shown in Figs. 3 and 4, the inner surface portion 33 is provided inside (backside) the surface portion 32. The inner surface portion 33 is accommodated between the surface portion 32 and the base 20. The inner surface portion 33 spreads along the back surface of the surface portion 32. A gap 35 is formed between the surface portion 32 and the inner surface portion 33. The back surface of the surface portion 32 and the surface of the inner surface portion 33 are separated without being in close contact with each other. The material of the inner surface portion 33 may be rubber such as ethylene propylene rubber (EPDM) or silicone rubber (SI). The inner surface portion 33 can elastically deform to contact the base 20.

[0024] As shown in FIG. 5, the inner surface portion 33 includes a frame portion 36 and a plurality of bridge portions 41, 42, and 43. The frame portion 36 constitutes the peripheral portion of the brush surface 30. The frame portion 36 is adhesively fixed to the base 20. The frame portion 36 has a pair of long edges 37 and a pair of short edges 38. The long edges 37 are longer than the short edges 38. The long edges 37 and the short edges 38 are curved. The degree of curvature of the long edges 37 is gentler than the degree of curvature of the short edges 38. The short edges 38 are portions extending in the left-right direction from the upper and lower ends of the first bridge portion 41 on the left side to the upper and lower ends of the first bridge portion 41 on the right side, which will be described later. The long edges 37 are the other portions.

[0025] As shown in Figures 4 and 5, the frame 36 has a recess 39 for venting air. The recess 39 is provided in the upper short edge 38. The recess 39 is a cutout formed in the center in the left-right direction of the short edge 38. The brush surface 30 is fixed to the base 20 by the recess 39 without blocking the air hole 23 of the base 20.

[0026] The dimension of the frame 36 in the front-back direction increases from the top to the bottom in side view as shown in Fig. 6. The dimension of the lower short edge 38 in the front-back direction is greater than the dimension of the upper short edge 38 in the front-back direction.

[0027] As shown in FIG. 5, the bridging portions 41, 42, 43 are provided in an area surrounded by the frame portion 36. When viewed from the front side, each of the bridging portions 41, 42, 43 extends in an elongated manner. Of the bridging portions 41, 42, 43, the first bridging portion 41 extends in the up-down direction. Three first bridging portions 41 are arranged at equal intervals in the left-right direction. The first bridging portions 41 are parallel to each other. One first bridging portion 41 is located at the center of the inner surface portion 33 in the left-right direction.

[0028] Of the cross-linking portions 41, 42, and 43, the second cross-linking portion 42 and the third cross-linking portion 43 extend in an oblique direction relative to the first cross-linking portion 41. The second cross-linking portion 42 and the third cross-linking portion 43 are formed symmetrically with respect to the first cross-linking portion 41. When viewed from the front side, the second cross-linking portions 42 and the third cross-linking portions 43 are arranged parallel to each other and at equal intervals.

[0029] The first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 intersect with each other. The first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 form a plurality of triangular shapes by intersecting with each other. The second cross-linking portion 42 and the third cross-linking portion 43 have intersections 44 where they intersect with each other. The intersections 44 are located at the first cross-linking portion 41 and the frame portion 36.

[0030] The inner surface portion 33 has a plurality of openings 45 surrounded by any one of the frame portion 36, the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43. The openings 45 are open on both the front and back sides. Most of the area surrounded by the frame portion 36 on the inner surface portion 33 is the openings 45.

[0031] As shown in Figs. 6 and 7, the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 each have a wall shape surrounding an opening 45. The height dimension 46 of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 is approximately constant in the extension direction. The height dimension 46 of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 is a dimension in the front-back direction, and is a dimension parallel to the Z-axis. The height dimension 46 of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 is larger than the thickness dimension of the surface portion 32 (see Figs. 3 and 4). The height dimensions 46 of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 are equal to each other. The first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 are gently curved so as to be parallel to the surface portion 32.

[0032] The thickness dimension 47 of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 is smaller than the height dimension 46 of each of them as shown in Fig. 6. The thickness dimension 47 of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 is a dimension in a direction perpendicular to the extension direction of each of them as seen from the front side as shown in Fig. 5. The thickness dimensions 47 of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43 are equal to each other.

[0033] As shown in Figs. 3 and 4, a plurality of protrusions 48 are provided between the surface portion 32 and the inner surface portion 33. The protrusions 48 are integrally formed with the inner surface portion 33. The protrusions 48 are connected to the inner surface portion 33 without being separated. The protrusions 48 are formed of the same material as the inner surface portion 33 and have elasticity. The height dimension of the protrusions 48 is larger than the thickness dimension of the surface portion 32 and smaller than the height dimension 46 of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43. The tip of the protrusion 48 is disposed in contact with or close to the surface portion 32 when the cushion brush 10 is not in use (when the surface portion 32, the inner surface portion 33, and the protrusions 48 are not elastically deformed).

[0034] 5, the protrusions 48 are provided on the surfaces of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43. The protrusions 48 are cylindrical. Some of the protrusions 48 are disposed at the positions of the intersections 44. The protrusions 48 are disposed at approximately equal intervals in the extension direction of each of the first cross-linking portion 41, the second cross-linking portion 42, and the third cross-linking portion 43.

[0035] Next, an example of how to use the cushion brush 10 will be described. The user holds the handle 12 in the hand and gently presses the brush bristles 31 against the scalp while brushing. The tips of the brush bristles 31 form a surface that is curved in the opposite direction to the direction that makes it easy to follow the scalp, making it easy to wrap the hair around it.

[0036] The scalp is massaged by pressing the tips of the brush bristles 31 against the scalp. By pressing the tips of the brush bristles 31 against the scalp, the surface portion 32 receives a force toward the back side. The surface portion 32 elastically deforms toward the back side so as to fill the gap 35. By elastically deforming the surface portion 32, the protrusions 48 are pushed toward the back side and elastically deform so as to fall. In addition, the first cross-linked portion 41, the second cross-linked portion 42, and the third cross-linked portion 43 are pushed toward the back side and elastically deform so as to fall. The collapse refers to deformation in which each of the cross-linked portions 41, 42, and 43 is tilted in a direction perpendicular to the extension direction of the cross-linked portion. The elastic deformation of the first cross-linked portion 41, the second cross-linked portion 42, and the third cross-linked portion 43 occurs along the extension direction of each of them. The first cross-linked portion 41, the second cross-linked portion 42, and the third cross-linked portion 43 fall in different directions from each other.

[0037] When the brush surface 30 sinks more, the inner surface portion 33 comes into contact with the base 20. When the inner surface portion 33 is in contact with the base 20, it falls over and elastically supports the surface portion 32. If the brush surface is formed only of a soft surface portion, when the brush surface sinks more, the user will feel a hard sensation when the brush surface directly hits the base. However, since the surface portion 32 does not directly hit the base 20, it is possible to prevent the scalp from feeling a hard sensation when the brush surface 30 hits the base 20.

[0038] When the tips of the brush bristles 31 are moved away from the scalp, the force acting on the brush bristles 31 is reduced. The surface portion 32 attempts to return to its original state due to its own elasticity. The inner surface portion 33 initially assists the force of the surface portion 32 returning to its original state. As the surface portion 32 returns to its original state, the force acting on the inner surface portion 33 is reduced. The inner surface portion 33 returns to its original state while pushing the surface portion 32 towards the front. This makes it possible to prevent the surface portion 32 from sinking and not returning to its original state.

[0039] Next, the operation and effect of the embodiment configured as described above will be described. The cushion brush 10 includes a brush surface 30 and a base 20 to which the brush surface 30 is fixed. The brush surface 30 includes a surface portion 32 having a plurality of brush bristles 31 and an inner surface portion 33 provided inside the surface portion 32. Both the surface portion 32 and the inner surface portion 33 have elasticity. The surface portion 32 and the inner surface portion 33 can be elastically deformed relative to each other. According to this configuration, the surface portion 32 and the inner surface portion 33 elastically deform inward when subjected to an inward force, and tend to return to their original state when the inward force is removed. The surface portion 32 returns to its original state not only by its own elastic force, but also with the help of the inner surface portion 33 which tends to return to its original state. Therefore, the surface portion 32 can be elastically deformed to a large extent to a point where it cannot return to its original state by its own elastic force alone, thereby improving the cushioning of the brush surface 30.

[0040] A gap 35 is formed between the surface portion 32 and the inner surface portion 33 when the surface portion 32 and the inner surface portion 33 are not elastically deformed. With this configuration, the surface portion 32 elastically deforms independently in the initial stage upon receiving an inward force, so that the ease of deformation of the brush surface 30 can be ensured, and a soft feel can be achieved.

[0041] A plurality of protrusions 48 are provided on the outer surface of the inner surface portion 33. According to this configuration, the protrusions 48 interposed between the front surface portion 32 and the inner surface portion 33 can reliably secure the gap 35 between the front surface portion 32 and the inner surface portion 33, thereby improving the cushioning properties of the brush surface 30.

[0042] A plurality of openings 45 are formed in the inner surface portion 33. With this configuration, the weight of the inner surface portion 33 can be reduced, and the cushion brush 10 can be made more comfortable to use.

[0043] The inner surface portion 33 has a plurality of elongated bridge portions 41, 42, 43. The bridge portions 41, 42, 43 are formed to intersect along the inner surface of the surface portion 32. According to this configuration, the inner surface portion 33 deforms along the extending direction of the bridge portions 41, 42, 43, so that a wide range of the inner surface portion 33 can be easily deformed.

[0044] The bridges 41, 42, and 43 cross each other to form a plurality of triangles. With this configuration, the inward force is dispersed in a well-balanced manner along the bridges 41, 42, and 43, making it easier to make the change in the amount of elastic deformation of the inner surface portion 33 have a constant gradient. Therefore, the scalp can be massaged with a good feeling when used.

[0045] <Other Examples> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments are also included within the technical scope of the present invention. (1) In the above embodiment, the inner surface portion 33 may be in the form of a sheet stored between the front surface portion 32 and the base 20. In this case, the openings 45 may be scattered over the entire area of ​​the inner surface portion 33. When the inner surface portion 33 is fixed to the rear side of the air holes 23, the openings 45 function as the air holes 23. With this configuration, the shape of the inner surface portion 33 can be simplified. (2) In the above embodiments, the inner surface may be made of a sponge or a spring material such as a coil spring or a leaf spring. (3) In the above embodiment, the inner surface portion may be provided with two or more layers. (4) In the above embodiment, the protrusion 48 is provided integrally with the inner surface portion 33. However, the present invention is not limited to this, and the protrusion may be provided integrally with the surface portion, or may be provided integrally with both the inner surface portion and the surface portion. (5) In the above embodiment, the air holes 23 are formed in the base 20. However, the invention is not limited to this, and the air holes may be formed in the surface portion. (6) In the above embodiment, the cushion brush 10 may be a hairbrush used for brushing human hair, or a brush used for brushing animal hair. (7) In the above embodiment, the brush bristles may be animal hair or may be made of nylon or metal. The brush bristles may be made of a bundle of multiple bristles. If the cushion brush is a shampoo brush, a brush for applying finger pressure to the scalp, a face-washing brush, a body brush, or the like, the brush bristles may be resin pins. (8) In the above embodiment, the brush bristles may be molded integrally with the surface portion. (9) In the above embodiment, the handle portion 12 extends downward from the brush portion 11. However, the present invention is not limited to this, and the handle portion may not extend from the brush portion. Specifically, for example, the handle portion may be a part of the brush portion, for example, the back side of the brush portion excluding the brush surface. (10) In the above embodiment, the cushion brush 10 is a hairbrush for combing hair. However, the cushion brush is not limited to this, and may be a shampoo brush, a brush for applying finger pressure to the scalp, a face-washing brush, a body brush, or the like. (11) In the above embodiment, the protrusion 48 is cylindrical. However, the shape of the protrusion may be changed as appropriate. For example, the protrusion may be a mountain-like shape (ridge line) whose width gradually decreases toward the protruding end, or a spherical shape. [Explanation of symbols]

[0046] 10…Cushion brush 20…Foundation 30…Brush surface 31…Bristles 32...Surface part 33…Inner surface 35…Gap 41, 42, 43...Multiple bridge sections 45…Opening 48…Protrusion

Claims

1. A brush surface and a base to which the brush surface is fixed, The brush surface has a surface portion having a plurality of brush bristles and an inner surface portion provided inward from the surface portion, Both the surface portion and the inner portion have elasticity, The surface portion and the inner portion are elastically deformable relative to each other.

2. The cushion brush according to claim 1 , wherein a gap is formed between the surface portion and the inner surface portion when the surface portion and the inner surface portion are not elastically deformed.

3. The cushion brush according to claim 2 , wherein a plurality of protrusions are provided on at least one of the inner surface of the front surface portion and the outer surface of the inner surface portion.

4. The cushion brush according to claim 1 , wherein the inner surface portion has at least one opening formed therein.

5. The inner surface portion has a plurality of elongated bridge portions, The cushion brush according to claim 4 , wherein the plurality of bridge portions are formed so as to cross each other along an inner surface of the surface portion.

6. The cushion brush according to claim 5 , wherein the bridge portions intersect with each other to form a plurality of polygonal shapes.

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