Coating body and coating member

Abstract

The invention provides a coating body and a coating member, which have high elasticity, can make the whole coating body recessed, and can simplify the structure. A coating body (10) according to one embodiment applies a coating material (M) to a portion to be coated. The coating body (10) is provided with: a cylindrical part (11A) fixed to a holding member (3) that holds the coating body (10); and a hollow protruding part (11B) protruding from the cylindrical part (11A), the protruding part (11B) comprising an elastic body. The protruding section (11B) has: a curved surface section (13) protruding from the cylindrical section (11A); and an expanded-diameter section (12) which is located between the cylindrical section (11A) and the curved surface section (13) and which expands in diameter from the cylindrical section (11A) toward the curved surface section (13).

Description

Technical Field

[0001] This disclosure relates to a coating body and a coating component for applying a coating material to a coated portion. Background Technology

[0002] Patent Document 1 describes a cosmetic application tool comprising an application body and a support portion to which the application body is attached at its end. The top end of the application body is spherical. The application body has a base that is inserted into a large-diameter end portion of the support portion. The support portion comprises: a shaft extending from the large-diameter end; an outer cylinder into which the shaft is inserted; and a rotation mechanism for rotating the application body and the shaft relative to the outer cylinder. A spring and a sponge are provided inside the outer cylinder as elastic bodies to resist the insertion of the shaft.

[0003] When the coating body slides on the surface to be coated, pressure is applied to the shaft, causing it to rotate and be pressed into the outer cylinder. When the coating body is removed from the surface, the shaft returns to its original position due to the elasticity of the spring and sponge. During the application of cosmetics with the coating body, the coating body rotates relative to the outer cylinder and moves on the surface to be coated.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2014-128488

[0007] Furthermore, the coating body undergoes elastic deformation and indents when it comes into contact with the coated area. To achieve a gradient and aesthetically pleasing coating effect, the coating body must possess high elasticity and indent entirely during application. The aforementioned cosmetic coating tool, with its numerous components including a rotating mechanism that rotates the coating body and shaft relative to the outer cylinder, as well as springs and sponges acting as elastic elements, is complex. Therefore, a simplified design is required. Summary of the Invention

[0008] The purpose of this disclosure is to provide a coating body and coating component that are highly elastic, allow the coating body to be recessed as a whole, and simplify the structure.

[0009] (1) The coating body of this disclosure applies a coating material to a coated portion. The coating body includes: a cylindrical portion fixed to a holding member for holding the coating body; and a protrusion protruding from the cylindrical portion and being hollow, the protrusion being made of an elastic body. The protrusion has: a curved portion protruding relative to the cylindrical portion; and an enlarged portion located between the cylindrical portion and the curved portion and expanding in diameter from the cylindrical portion toward the curved portion.

[0010] The coating body comprises a cylindrical portion and a protruding portion. The cylindrical portion is fixed to a holding member, thereby holding the coating body thereon. The protruding portion protrudes from the cylindrical portion and is hollow, being constructed of an elastic body. The protruding portion has a curved surface and an enlarged diameter portion located between the cylindrical portion and the curved surface, the enlarged diameter portion expanding from the cylindrical portion toward the curved surface. Therefore, the curved surface can have high elasticity, and springs, sponges, and rotating mechanisms are not required, thus simplifying the structure. When coating is performed by contacting the curved surface with the part to be coated, the enlarged diameter portion can make the curved surface concave overall. Therefore, by contacting the curved surface with the part to be coated, the coating material adhering to the curved surface can be applied in a gradient and aesthetically pleasing manner in a blending manner.

[0011] (2) In (1) above, the curved surface may have a portion where the thickness of the coating at the curved surface is greater than the thickness of the coating at the enlarged diameter portion. In this case, the curved surface has a portion that is thicker than the enlarged diameter portion, thereby preventing local depressions in the curved surface and ensuring that the curved surface is depression-free.

[0012] (3) In (1) or (2) above, the thickness of the coating at the curved surface may also increase as it moves away from the diameter expansion portion. In this case, it is possible to prevent the curved surface from bending at specific locations and to make the curved surface concave as a whole without any omissions.

[0013] (4) The coating component of this disclosure includes: the coating body described above; and a holding member that holds the coating body by fixing the cylindrical portion of the coating body. Since the coating component includes the coating body described above, it will perform the same function as the coating body described above.

[0014] (5) In (4) above, the retaining member may also have an internal space that communicates with the exterior of the coating member and the interior of the curved surface. In this case, when the curved surface comes into contact with the coated portion, the air inside the curved surface can be released to the exterior of the coating member through the internal space of the retaining member. Therefore, the elasticity of the curved surface can be further improved, making the curved surface more prone to concavity.

[0015] Invention Effects

[0016] According to this disclosure, it has high elasticity, which allows the coating to be recessed as a whole and simplifies the structure. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view showing the coating component of an embodiment.

[0018] Figure 2 It is shown Figure 1 A cross-sectional view of the coating body and the retaining component of the coating component.

[0019] Figure 3 It is shown Figure 2 A three-dimensional view of the retaining component.

[0020] Figure 4 It is shown Figure 2 A three-dimensional image of the coated body.

[0021] Figure 5 It is shown Figure 2 A side view of the coated body.

[0022] Figure 6 It is shown Figure 2 A cross-sectional view of the coated body.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1: Coating component; 2A: Outer cylinder; 3: Holding component; 3A: Internal space; 4: Middle cylinder; 5: Inner cylinder; 5b: Insertion part; 5b1: Protrusion; 5b2: Recess; 5c: Annular recess; 5d: Annular protrusion; 5f: Annular protrusion; 5g: Protrusion; 5h: Annular protrusion; 6: Cap; 6A: Cylindrical part; 6B: Tail plug; 7: Coating material receiving part; 8: Spring; 10: Coating body; 11A: Cylindrical part; 11B: Protrusion ; 11b: Annular protrusion; 11b1: Top surface; 11b2: First inclined surface; 11b3: Second inclined surface; 11d: Inner surface; 11f: Outer surface; 11h: Bending part; 12: Expanded diameter part; 12b: First bending surface; 12c: Inclined surface; 12d: Second bending surface; 13: Curved part; 13b: Cylindrical part; 13c: Bending part; 13d: Top; D: Axial direction; L: Axis; M: Coating material; S: Gap. Detailed Implementation

[0025] Hereinafter, embodiments of the coating body and coating member of this disclosure will be described. In the description of the drawings, the same or equivalent elements are labeled with the same reference numerals, and repeated descriptions are omitted where appropriate. Sometimes, for ease of understanding, parts are depicted in a simplified or exaggerated manner in the drawings, and the size ratios are not limited to those shown in the drawings.

[0026] Figure 1 This is a cross-sectional view showing the coating member 1 equipped with the coating body 10 according to this embodiment. Figure 1 As shown, the coating component 1 is a coating container that holds the coating material M and allows a user to apply the coating material M through the coating body 10. The coating material M is, for example, in a solid state. However, the coating material M may also be in a semi-solid, soft, or gel state.

[0027] As an example, the coating material M is a cosmetic, and the coating component 1 is a cosmetic container. The coating body 10 applies the coating material M to the part to be coated. The "part to be coated" refers to the part to which the coating material is applied. The "part to be coated" is, for example, the skin, eyebrows, hair, or paper of the user to which the coating component 1 is applied.

[0028] In the coating member 1, a portion of the components are cylindrical. In this specification, "axis" and "axis line" refer to the center line extending along the longitudinal direction of the coating member 1, and "axis direction" refers to the direction along the axis L of the coating member 1. For example, in the coating member 1, when the components are assembled, the axes L of multiple cylindrical components extend in the same direction. Hereinafter, the direction in which this axis L extends will be defined as the axis direction D. The coating member 1 is, for example, a rod extending along the axis direction D. As an example, the coating member 1 is a cylindrical rod.

[0029] The coating component 1 has a coating body 10 and a container body 2 for holding the coating body 10. The container body 2 has an outer cylinder 2A that forms the outer surface of the container body 2 and a holding member 3 for holding the coating body 10. For example, the outer cylinder 2A is provided as a bottomed cylinder (as an example, a bottomed cylindrical shape). A portion of the holding member 3 is housed inside the outer cylinder 2A.

[0030] A portion of the coating body 10 protrudes from the retaining member 3. Hereinafter, the direction in which the coating body 10 protrudes from the retaining member 3 is sometimes referred to as "front," "front side," or "forward," and its opposite direction as "rear," "rear side," or "rearward." "Radial" refers to the direction towards and away from the axis L in a plane orthogonal to the axis L of the coating member 1. "Radial outer" refers to the radial direction away from the axis L, and "radial inner" refers to the radial direction towards the axis L. "Circumferential" refers to the direction along a ring centered on the axis L. However, these directions are for ease of explanation and do not limit the position or orientation of the object.

[0031] The retaining member 3 includes: a middle cylinder 4 having a portion accommodated within the outer cylinder 2A; and an inner cylinder 5 located inside the middle cylinder 4. The middle cylinder 4 engages with the outer cylinder 2A in the axial direction D. The inner cylinder 5 is located at the front side of the middle cylinder 4. The inner cylinder 5 engages with the middle cylinder 4 in the axial direction D within the middle cylinder 4. The retaining member 3 retains the coating body 10 by clamping it between the middle cylinder 4 and the inner cylinder 5.

[0032] The coating component 1 has a cap 6 that covers the coating body 10 and is attached to the container body 2. The cap 6 includes a cylindrical portion 6A and a tail plug 6B. The tail plug 6B blocks one end of the cylindrical portion 6A in the axial direction D. The tail plug 6B is configured to be bottomed and cylindrical (for example, a bottomed cylindrical shape). The cap 6 is designed to be easily attached to and detached from the container body 2 (e.g., the inner cylinder 4). The cap 6 is attached to the container body 2 by engaging with the inner cylinder 4 in the axial direction D via the cylindrical portion 6A.

[0033] The cap 6 has a coating material receiving portion 7 located inside the cylindrical portion 6A and a spring 8 that applies force to the coating material receiving portion 7 rearward. The coating material receiving portion 7 is provided as a bottomed cylindrical shape (for example, a bottomed cylindrical shape). The coating material M is filled inside the coating material receiving portion 7. The coating material receiving portion 7 can move along the axial direction D inside the cylindrical portion 6A. When the cap 6 is attached to the container body 2, the coating body 10 enters the inside of the coating material receiving portion 7 and comes into contact with the coating material M. Thus, the coating material M is attached to the coating body 10.

[0034] A spring 8 is positioned between the tail plug 6B and the coating material receiving portion 7. With the cap 6 attached to the container body 2, the spring 8 applies a rearward force to the coating material receiving portion 7. For example, the coating material receiving portion 7 has a reduced diameter at the end on the tail plug 6B side, and one end of the spring 8 is wound around this reduced diameter portion.

[0035] The spring 8 applies force to the coating material M contained in the coating material receiving portion 7 together with the coating material receiving portion 7 toward the coating body 10. Therefore, even if the remaining amount of coating material M in the coating material receiving portion 7 is reduced, the coating material M can be reliably attached to the coating body 10, so that the coating material M contained in the coating material receiving portion 7 can be used up.

[0036] Figure 2 This is a cross-sectional view showing the coating body 10 and the inner cylinder 5. (See attached image.) Figure 1 and Figure 2 As shown, the inner cylinder 5 is part of the retaining member 3. The coating body 10 has a cylindrical portion 11A fixed to the retaining member 3 (inner cylinder 5) that holds the coating body 10, and a protrusion 11B protruding from the cylindrical portion 11A.

[0037] Figure 3 This is a perspective view showing the inner cylinder 5. (Example) Figure 1 , Figure 2 as well as Figure 3 As shown, the inner cylinder 5 has: an insertion portion 5b, which has a portion that inserts into the cylindrical portion 11A; and a protrusion 5g, which protrudes from the insertion portion 5b in a direction opposite to that of the coating body 10. The coating body 10 is made of a non-air-permeable and non-impregnating material. That is, the coating body 10 is made of a material that does not allow the coating material M to pass through.

[0038] The coating body 10 is, for example, made of an elastomer. For instance, the coating body 10 is made of nitrile butadiene rubber (NBR). In this case, the cost of the material of the coating body 10 can be controlled, and a material with good compatibility with the coating material M can be used. However, the coating body 10 may also be made of a material different from NBR, such as silicone rubber, depending on the material of the coating material M.

[0039] The radial length of the insertion portion 5b is greater than the radial length of the protrusion 5g. The protrusion 5g, for example, has an annular protrusion 5h that engages with the inner surface of the middle cylinder 4 in the axial direction D. The insertion portion 5b engages with the inner surface of the cylindrical portion 11A in a manner that prevents movement in the axial direction and in the circumferential direction. The insertion portion 5b has a plurality of protrusions 5b1 and a plurality of recesses 5b2 arranged circumferentially, with the protrusions 5b1 and recesses 5b2 alternating circumferentially. The plurality of protrusions 5b1 abut against the inner surface of the cylindrical portion 11A. Thus, the inner cylinder 5 engages with the coating body 10 in the circumferential direction.

[0040] The insertion portion 5b has an annular recess 5c located at the rear end of the protrusion 5b1, an annular protrusion 5d protruding from the bottom surface of the annular recess 5c, and an annular protrusion 5f located behind the annular recess 5c. The annular recess 5c allows the inner surface of the cylindrical portion 11A (the annular protrusion 11b described later) to enter, and the inner surface of the cylindrical portion 11A that enters the annular recess 5c allows the annular protrusion 5d to enter.

[0041] When the cylindrical portion 11A enters the annular recess 5c, it becomes shaped such that the annular protrusion 5d inserts into the inner surface of the cylindrical portion 11A. The annular recess 5c is located between the protrusion 5b1 and the annular protrusion 5f, and the height of the annular protrusion 5d relative to the bottom surface of the annular recess 5c increases towards the rear. That is, the radial length of the annular protrusion 5d increases towards the rear. For example, by making the radially outer end of the annular protrusion 5d pointed, the annular protrusion 5d can be inserted into the inner surface of the cylindrical portion 11A that enters the annular recess 5c.

[0042] The coating body 10 will be described in more detail. Figure 4 This is a three-dimensional view showing the coated body 10. Figure 5 This is a side view showing the coating body 10. Figure 6 yes Figure 5 A sectional view along line A-A. For example... Figure 4 , Figure 5 as well as Figure 6 As shown, the protrusion 11B of the coating body 10 is hollow. The protrusion 11B is made of an elastomer. In the above description, an example of the coating body 10 being made of an elastomer has been given. However, it is also possible that only the protrusion 11B of the coating body 10 is made of an elastomer.

[0043] The protrusion 11B has a curved portion 13 that protrudes relative to the cylindrical portion 11A and an enlarged portion 12 located between the cylindrical portion 11A and the curved portion 13. The enlarged portion 12 is the portion that expands in diameter from the cylindrical portion 11A toward the curved portion 13. That is, the radial length of the enlarged portion 12 increases as it moves from the cylindrical portion 11A toward the curved portion 13.

[0044] The curved surface 13 is the portion for which the coating material M adheres and contacts the portion to be coated. When in contact with the portion to be coated, the curved surface 13 is recessed, and the coating material M is applied to the portion. The curved surface 13 is non-impregnating. Therefore, the coating material M does not permeate the curved surface 13, and the coating material M adheres thinly to the curved surface 13, thereby allowing the coating material M to be applied to the portion to be coated in a gradient manner. Therefore, by adjusting the pushing force of the curved surface 13 towards the portion to be coated, the coating material M can be applied while creating a gradient.

[0045] The enlarged diameter portion 12, for example, has a first curved surface 12b extending from the cylindrical portion 11A toward the curved portion 13, a second curved surface 12d extending from the curved portion 13 toward the cylindrical portion 11A, and an inclined surface 12c extending from the first curved surface 12b to the second curved surface 12d. The first curved surface 12b is curved in a way that it is concave as it approaches the cylindrical portion 11A from the inclined surface 12c. The second curved surface 12d is curved in a way that it is convex as it approaches the curved portion 13 from the inclined surface 12c. The enlarged diameter portion 12 has the first curved surface 12b and the second curved surface 12d, thereby enabling the curved portion 13 to be more effectively concave during the application of the coating material M.

[0046] The curved section 13 may have, for example, a cylindrical portion 13b extending forward from the expanded diameter portion 12, a curved portion 13c that gradually narrows as it moves forward from the cylindrical portion 13b, and a top 13d located at the end of the curved portion 13c on the side opposite to the cylindrical portion 13b. The cylindrical portion 13b is cylindrical, and the curved portion 13c is hemispherical. The top 13d may also have a flat surface extending along a plane orthogonal to the axis L.

[0047] like Figure 1 , Figure 2 as well as Figure 6 As shown, the cylindrical portion 11A has an outer surface 11f opposite to the inner surface of the middle cylinder 4. The cylindrical portion 11A has a curved portion 11h at its rear end on the outer surface 11f, which gradually narrows towards the rear. The cylindrical portion 11A has an inner surface 11d opposite to the outer surface of the inner cylinder 5. The cylindrical portion 11A has an annular protrusion 11b on its inner surface 11d that engages with the inner cylinder 5 in the axial direction D.

[0048] An annular protrusion 11b protrudes radially inward at the inner surface 11d of the cylindrical portion 11A. In a cross-section cut along a plane including the axis L, the annular protrusion 11b is trapezoidal. The annular protrusion 11b has a first inclined surface 11b2 protruding radially inward from the rear end of the cylindrical portion 11A, a top surface 11b1 extending circumferentially along the axial direction D from the first inclined surface 11b2, and a second inclined surface 11b3 recessed from the top surface 11b1 toward the enlarged diameter portion 12. With respect to the annular protrusion 11b (top surface 11b1), the annular protrusion 5d of the inner cylinder 5 extends radially outward, thereby pressing the inner surface (radially outward) of the middle cylinder 4 against the cylindrical portion 11A. Thus, the cylindrical portion 11A can be securely clamped between the middle cylinder 4 and the inner cylinder 5.

[0049] The thickness of each portion of the coating body 10 will be explained. The curved portion 13 has a portion where the thickness of the coating body 10 at the curved portion 13 is greater than the thickness of the coating body 10 at the diameter expansion portion 12. For example, the thickness of the coating body 10 at the curved portion 13 increases as it moves away from the diameter expansion portion 12. That is, the thickness of the curved portion 13 increases as it moves from the cylindrical portion 13b toward the curved portion 13c, and increases as it moves from the curved portion 13c toward the top 13d.

[0050] For example, the thickness of the enlarged diameter portion 12 is thinner than the thickness of the portion of the coating body 10 other than the enlarged diameter portion 12. The thickness of the enlarged diameter portion 12 is constant. The thickness of the cylindrical portion 11A is thicker than the thickness of the enlarged diameter portion 12. The maximum thickness of the annular protrusion 11b of the cylindrical portion 11A (the thickness of the annular protrusion 11b at the top surface 11b1) is greater than the thickness of the portion of the coating body 10 other than the annular protrusion 11b. That is, the annular protrusion 11b of the cylindrical portion 11A is the thickest part of the coating body 10.

[0051] As an example, the maximum thickness of the annular protrusion 11b is 0.8 mm, the thickness of the portion of the cylindrical portion 11A other than the annular protrusion 11b is 0.6 mm, the thickness of the expanded diameter portion 12 is 0.5 mm, and the thickness of the top 13d of the curved portion 13 is 0.6 mm. Furthermore, the thickness of the coating body 10 gradually increases from 0.5 mm to 0.6 mm as it approaches the top 13d from the expanded diameter portion 12. The examples of the thickness of the coating body 10 have been described above. However, the thickness of the coating body 10 is not limited to the values ​​described above and can be appropriately varied.

[0052] The retaining member 3 has an internal space 3A that communicates with the exterior of the coating member 1 and the interior of the curved surface 13. In this embodiment, the internal space 3A is formed inside the inner cylinder 5 and the middle cylinder 4. The internal space 3A communicates with the exterior of the coating member 1, for example, via a gap S formed between the container body 2 (outer cylinder 2A) and the middle cylinder 4. Thus, when the curved surface 13 is pressed by coating or the like, air inside the curved surface 13 passes through the internal space 3A and the gap S and is discharged to the exterior of the coating member 1.

[0053] Next, the effects of the coating member 1 of this embodiment will be explained. The coating body 10 includes a cylindrical portion 11A and a protrusion 11B. The cylindrical portion 11A is fixed to the holding member 3, thereby holding the coating body 10 to the holding member 3. The protrusion 11B is composed of an elastic body that protrudes from the cylindrical portion 11A and is hollow. The protrusion 11B has a curved surface portion 13 and an enlarged diameter portion 12 located between the cylindrical portion 11A and the curved surface portion 13, the enlarged diameter portion 12 expanding from the cylindrical portion 11A toward the curved surface portion 13. Therefore, the curved surface portion 13 can have high elasticity, and it is not necessary to provide springs, sponges, and rotating mechanisms in the container body 2, thus simplifying the structure.

[0054] When coating is performed by bringing the curved surface 13 into contact with the part to be coated, the diameter-enlarging portion 12 can make the curved surface 13 concave overall. Therefore, by bringing the curved surface 13 into contact with the part to be coated, the coating material M attached to the curved surface 13 can be coated in a gradient and aesthetically pleasing manner in a smudged manner.

[0055] In this embodiment, the curved surface 13 has a portion where the thickness of the coating 10 at the curved surface 13 is greater than the thickness of the coating 10 at the diameter expansion portion 12. In this embodiment, the thickness of the top 13d is greater than the thickness of the diameter expansion portion 12. In this case, the curved surface 13 has a portion that is thicker than the diameter expansion portion 12, thereby preventing localized depressions in the curved surface 13 and ensuring that the curved surface 13 is completely depression-free.

[0056] In this embodiment, the thickness of the coating 10 at the curved surface 13 increases as it moves away from the diameter expansion portion 12. In this case, it is possible to prevent the curved surface 13 from bending at specific locations, and to make the curved surface 13 concave overall without any omissions.

[0057] The coating member 1 of this embodiment includes a coating body 10 and a holding member 3, which fixes the cylindrical portion 11A of the coating body 10 to hold the coating body 10. The coating member 1 includes the coating body 10 described above, and therefore performs the same function as the coating body 10 described above.

[0058] In this embodiment, the retaining member 3 has an internal space 3A that communicates with the exterior of the coating member 1 and the interior of the curved surface 13. In this case, when the curved surface 13 comes into contact with the coated portion, air inside the curved surface 13 can be released to the exterior of the coating member 1 through the internal space 3A of the retaining member 3. Therefore, the elasticity of the curved surface 13 can be further improved, making the curved surface 13 easier to indent.

[0059] The embodiments of the coating body and coating component of this disclosure have been described above. However, the coating body and coating component of this disclosure are not limited to the above-described embodiments and can be modified within the scope of the spirit stated in the claims. That is, the shape, size, material, quantity, and configuration of each part of the coating body and coating component of this disclosure can be appropriately changed within the scope of the above spirit.

[0060] For example, in the above embodiments, an example of the retaining member 3 including a middle cylinder 4 and an inner cylinder 5 has been described. However, the retaining member may also be composed of multiple components, or it may be a single component; the composition of the retaining member can be appropriately modified. In the above embodiments, an example of the retaining member 3 for holding the coating body 10 being provided in the container body 2, and the container body 2 having an outer cylinder 2A and the retaining member 3, has been described. However, the retaining member may not be provided in the container body 2, or it may be provided separately.

[0061] In the above embodiment, a coating member 1 having a cap 6 attached to the container body 2 has been described. However, the coating member may also not have a cap 6. For example, the coating material receiving portion that holds the coating material M may be separately provided from the coating body 10 and the holding member 3. In this way, the configuration of the coating member can be appropriately modified.

[0062] In the above embodiments, the coating material M is described as cosmetic, and the coating member 1 serves as a cosmetic container. However, the coating material can also be a material other than cosmetic. For example, the coating material can also be a painting material. The coating body and coating member disclosed herein are not limited to cosmetics, but can also be applied to various painting materials such as notebooks or stationery.

Claims

1. A coating body for applying a coating material to a portion to be coated, the coating body comprising: The cylindrical portion is fixed to a holding member that holds the coating body; and A protrusion, extending from the cylindrical portion and being hollow, is made of an elastomer. The protrusion has: The curved portion protrudes relative to the cylindrical portion; and The enlarged diameter portion is the portion located between the cylindrical portion and the curved portion, which expands in diameter from the cylindrical portion toward the curved portion.

2. The coating body according to claim 1, wherein, The curved surface has a portion where the thickness of the coating at the curved surface is greater than the thickness of the coating at the expanded diameter portion.

3. The coating body according to claim 1 or claim 2, wherein, The thickness of the coating at the curved surface increases as it moves away from the expanded diameter portion.

4. A coating component, comprising: The coating body as described in claim 1 or claim 2; and A retaining member is used to hold the coating body by fixing the cylindrical portion of the coating body.

5. The coating component according to claim 4, wherein, The retaining member has an internal space that communicates with the exterior of the coating member and the interior of the curved surface.

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