Container

Abstract

To provide a container capable of attaching and detaching a pouring cap to a container while preventing the pouring cap from rotating together with an over-cap.SOLUTION: The container includes: a container that has a mouth that opens upward and contains contents; and a pouring cap that is detachably attached to the mouth. The mouth is cylindrical and extends along the central axis of the container. The pouring cap has an outer tube that is cylindrical and extends along the central axis and is disposed radially outward from the mouth about the central axis. One of the mouth and the outer tube has a plurality of protrusions that protrudes radially and is disposed along the circumferential direction about the central axis. The other of the mouth and the outer tube has a plurality of recesses that is recessed radially and disposed along the circumferential direction. The respective protrusions are disposed inside different recesses from each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a container.

Background Art

[0002] A capped container having a container, a pouring cap that is fitted to the mouth of the container and has a pouring outlet, and an overcap that is detachably screwed to the pouring cap and covers the pouring outlet is known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described capped container, when the overcap is rotated in the circumferential direction with respect to the pouring cap and removed from the pouring cap or attached to the pouring cap, there is a risk that the pouring cap may come off from the mouth of the container because the pouring cap rotates together with the overcap. In order to suppress such co-rotation, a capped container provided with ratchets that contact each other in the circumferential direction at the mouth of the container and the pouring cap is known. However, in such a capped container, in order to remove the pouring cap from the container, it was necessary to break the ratchet. Therefore, it was difficult to attach the pouring cap to the container again.

[0005] The present invention has been made in consideration of the above points, and one of its objects is to provide a container that can attach and detach a pouring cap to and from the container while suppressing the co-rotation of the pouring cap with the overcap.

Means for Solving the Problems

[0006] The present invention includes the following configurations. [1] A container having an opening on the upper side for accommodating contents, and a pouring cap detachably attached to the opening. The opening is cylindrical and extends along the central axis of the container. The pouring cap is cylindrical and extends along the central axis, and has an outer cylinder portion disposed radially outside the opening with respect to the central axis. Either the opening or the outer cylinder portion protrudes in the radial direction and has a plurality of convex portions arranged along the circumferential direction centered on the central axis. The other of the opening and the outer cylinder portion is recessed in the radial direction and has a plurality of concave portions arranged along the circumferential direction. Each of the plurality of convex portions is disposed inside a different one of the plurality of concave portions. [2] The outer cylinder portion has a plurality of the convex portions, and the opening has a plurality of the concave portions. The container according to [1]. [3] The ratio of the radial dimension of the concave portion to the radial thickness of the opening is 50% or more. The container according to [2]. [4] When viewed from the axial direction, which is the direction in which the central axis extends, each of the plurality of convex portions and the plurality of concave portions is semi-circular. The container according to any one of [1] to [3]. [5] When viewed from the axial direction, which is the direction in which the central axis extends, each of the plurality of convex portions and the plurality of concave portions is triangular. The container according to any one of [1] to [3]. [6] When viewed from the axial direction, which is the direction in which the central axis extends, each of the plurality of convex portions and the plurality of concave portions is square. The container according to any one of [1] to [3]. [7] When viewed from the axial direction, which is the direction in which the central axis extends, the shape of each of the plurality of concave portions is the same as the shape of the convex portion disposed inside each of the plurality of concave portions. The shape of the outer cylinder portion when viewed from the axial direction is a rotationally asymmetric shape centered on the central axis by the shape of each of the plurality of convex portions when viewed from the axial direction and the circumferential arrangement of each of the plurality of convex portions. The container according to any one of [1] to [3].

Advantages of the Invention

[0007] In the present invention, it is possible to provide a container in which a pouring cap can be attached to and detached from the container while suppressing the co-rotation of the pouring cap with an overcap.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0009] Hereinafter, an example of the container of the present invention will be shown and described with reference to the drawings. In the following description, the dimensions and the like of the figures illustrated are examples, and the present invention is not necessarily limited thereto, and can be appropriately changed and implemented without changing the gist thereof. Further, in the following drawings, in order to make each configuration easy to understand, the scale and the number in each structure may be made different from the actual structure.

[0010] In each drawing, the Z-axis is appropriately shown. The Z-axis is the direction in which the central axis J, which is the central axis of the container of the embodiment described below, extends. The central axis J appropriately shown in each figure is a virtual axis. In the following description, the direction in which the central axis J extends, that is, the direction parallel to the Z-axis, is referred to as the "axial direction". In the present embodiment, the axial direction is the vertical direction. In the following description, the side to which the arrow of the Z-axis points in the axial direction (+Z side) is referred to as the "upper side", and the side opposite to the side to which the arrow of the Z-axis points in the axial direction (-Z side) is referred to as the "lower side".

[0011] In the following description, the radial direction centered on the central axis J is simply referred to as the "radial direction", the outer side in the radial direction is simply referred to as the "outer side in the radial direction", and the inner side in the radial direction is simply referred to as the "inner side in the radial direction". The circumferential direction centered on the central axis J is simply referred to as the "circumferential direction". The circumferential direction is indicated by the arrow θ in each figure. The side to which the arrow θ points in the circumferential direction is referred to as the "one side in the circumferential direction". The side opposite to the side to which the arrow θ points in the circumferential direction is referred to as the "other side in the circumferential direction". The one side in the circumferential direction is the side that advances clockwise around the central axis J when viewed from above (+θ side). The other side in the circumferential direction is the side that advances counterclockwise around the central axis J when viewed from above (-θ side).

[0012] <Embodiment> FIG. 1 is a cross-sectional view showing the container 10 of the present embodiment. FIG. 2 is a cross-sectional view showing the container 10 of the present embodiment and is a cross-sectional view taken along line II-II in FIG. 1. As shown in FIG. 1, the container 10 of the present embodiment includes a container 20, a pouring cap 30, and an overcap 40.

[0013] The container 20 is a bottle for storing contents. The container 20 has an opening on the upper side. The contents are, for example, liquid or powdered laundry detergents, liquid bleaches, fabric softeners, dishwasher detergents, and liquid mouthwashes. In the present embodiment, the container 20 is made of resin. As the resin constituting the container 20, polypropylene, high-density polyethylene, low-density polyethylene, polyethylene terephthalate, etc. can be used. The resin constituting the container 20 is preferably high-density polyethylene or polyethylene terephthalate. In the present embodiment, the container 20 is made of high-density polyethylene. In the present embodiment, the longitudinal elastic modulus (Young's modulus) of the container 20 is 500 MPa or more and 5000 MPa or less. The container 20 is formed by methods such as blow molding, stretch blow molding, and injection blow molding. The container 20 has a storage portion 20a and a mouth portion 21.

[0014] The accommodating portion 20a is the lower part of the container 20. The accommodating portion 20a is open upward. The internal space of the accommodating portion 20a is the accommodation space 20b. Contents (not shown) are accommodated in the accommodation space 20b. In the present embodiment, the accommodating portion 20a has a substantially square cylindrical shape centered on the central axis J. When viewed from the axial direction, the accommodating portion 20a has a substantially rectangular shape. The accommodating portion 20a may have other shapes such as a substantially cylindrical shape centered on the central axis J.

[0015] The mouth portion 21 is a cylindrical shape extending along the central axis J. In the present embodiment, the mouth portion 21 has a substantially cylindrical shape centered on the central axis J. The mouth portion 21 is open upward. The radial thickness Ta of the mouth portion 21 shown in FIG. 2 is 1.0 mm or more and 3.5 mm or less. As described above, the longitudinal elastic modulus (Young's modulus) of the container 20 is 500 MPa or more and 5000 MPa or less. Therefore, the longitudinal elastic modulus (Young's modulus) of the mouth portion 21 is 500 MPa or more and 5000 MPa or less. In the present embodiment, the mouth portion 21 has a plurality of recesses 23.

[0016] As shown in FIG. 1, the plurality of recesses 23 are holes that are recessed in the radial direction. In the present embodiment, each recess 23 is a hole that is recessed from the surface facing the outer side in the radial direction of the mouth portion 21 toward the inner side in the radial direction. The number of recesses 23 that the mouth portion 21 has is preferably 6 or more and 8 or less. As shown in FIG. 2, in the present embodiment, the mouth portion 21 has 8 recesses 23. Each recess 23 is arranged along the circumferential direction. In the present embodiment, each recess 23 is arranged at substantially equal intervals along the circumferential direction. The circumferential intervals between the recesses 23 arranged adjacent to each other in the circumferential direction may be different from each other. In the present embodiment, when viewed from the axial direction, each recess 23 has a semi-circular shape protruding toward the inner side in the radial direction. In the present embodiment, the ratio of the radial dimension Lo of each recess 23 to the radial thickness Ta of the mouth portion 21 is 50% or more. The radial dimension Lo of each recess 23 is preferably 1.0 mm or more and 3.0 mm or less.

[0017] The pouring cap 30 shown in Fig. 1 is detachably attached to the mouth portion 21 of the container 20. The pouring cap 30 is cylindrical and extends axially about the central axis J. In the present embodiment, the pouring cap 30 is made of resin. As the resin constituting the pouring cap 30, polypropylene, high-density polyethylene, low-density polyethylene, etc. can be used. The resin constituting the pouring cap 30 is preferably polypropylene. In the present embodiment, the pouring cap 30 is made of polypropylene. As described above, in the present embodiment, the container 20 is made of high-density polyethylene. Therefore, the pouring cap 30 and the container 20 are made of different resin materials. In the present embodiment, the longitudinal elastic modulus (Young's modulus) of the pouring cap 30 is 600 MPa or more and 4000 MPa or less. The pouring cap 30 is integrally formed by injection molding. The pouring cap 30 has an inner cylindrical portion 31, a bottom wall portion 32, an outer cylindrical portion 33, a connecting portion 36, an outer mouth portion 37, and a pouring portion 38.

[0018] The inner cylindrical portion 31 is substantially cylindrical and extends axially about the central axis J. The inner cylindrical portion 31 is disposed inside the mouth portion 21. The bottom wall portion 32 projects downward from the lower end of the inner cylindrical portion 31. The bottom wall portion 32 is substantially V-shaped and open upward when viewed in the radial direction. The bottom wall portion 32 is disposed inside the mouth portion 21. A communication portion 32b is provided in the bottom wall portion 32. The communication portion 32b is a hole that penetrates the bottom wall portion 32 in the axial direction.

[0019] The pouring portion 38 extends upward from the bottom wall portion 32. The pouring portion 38 is a trough-shaped having a substantially U-shaped cross-sectional shape when viewed from above. The inside of the pouring portion 38 communicates with the accommodation space 20b of the container 20 through the communication portion 32b. Thereby, the content accommodated in the accommodation space 20b is poured into the inside of the pouring portion 38 through the communication portion 32b. The pouring portion 38 guides the pouring of the content to the outside of the container 10. When viewed in the axial direction, the area of the opening of the pouring portion 38 is smaller than the area of the opening of the mouth portion 21. That is, when viewed in the axial direction, the area of the opening of the mouth portion 21 is wider than the area of the opening of the pouring portion 38.

[0020] The outer opening portion 37 protrudes upward from the upper end of the inner cylindrical portion 31. The outer opening portion 37 has a substantially cylindrical shape centered on the central axis J. The upper end of the outer opening portion 37 is the upper end of the pouring cap 30. A male screw portion 37a is provided on the outer peripheral surface of the outer opening portion 37. The connecting portion 36 has a substantially annular plate shape protruding radially outward from the upper end of the inner cylindrical portion 31. The plate surface of the connecting portion 36 faces the axial direction.

[0021] The outer cylindrical portion 33 is cylindrical and extends along the central axis J. In the present embodiment, the outer cylindrical portion 33 has a cylindrical shape centered on the central axis J. The outer cylindrical portion 33 is disposed radially outside the mouth portion 21. The outer cylindrical portion 33 surrounds the mouth portion 21 from the outside in the radial direction. The radial thickness Tc of the outer cylindrical portion 33 shown in FIG. 2 is 0.5 mm or more and 2.5 mm or less. As described above, the longitudinal elastic modulus (Young's modulus) of the pouring cap 30 is 600 MPa or more and 4000 MPa or less. Therefore, the longitudinal elastic modulus (Young's modulus) of the outer cylindrical portion 33 is 600 MPa or more and 4000 MPa or less. In the present embodiment, the outer cylindrical portion 33 has a plurality of convex portions 35.

[0022] As shown in Fig. 1, each convex portion 35 protrudes radially inward from the surface facing radially inward of the outer cylindrical portion 33. The number of the convex portions 35 of the outer cylindrical portion 33 is preferably 6 or more and 8 or less. As shown in Fig. 2, in the present embodiment, the outer cylindrical portion 33 has eight convex portions 35. Each convex portion 35 is arranged along the circumferential direction. In the present embodiment, each convex portion 35 is arranged at substantially equal intervals along the circumferential direction. The circumferential intervals between the convex portions 35 arranged adjacent to each other in the circumferential direction may be different from each other. In the present embodiment, when viewed from the axial direction, each convex portion 35 has a semi-circular shape protruding radially inward. The radial dimension Lt of each convex portion 35 is preferably 1.0 mm or more and 3.0 mm or less. Each convex portion 35 is arranged inside different concave portions 23. Thereby, when trying to rotate the pouring cap 30 in the circumferential direction with respect to the mouth portion 21, since the outer surface of each convex portion 35 and the inner surface of each concave portion 23 come into contact with each other in the circumferential direction, the rotational torque for rotating the pouring cap 30 in the circumferential direction with respect to the mouth portion 21 can be increased. In the following description, the rotational torque for rotating the pouring cap 30 in the circumferential direction with respect to the mouth portion 21 is referred to as the pouring portion rotational torque Tn. In the present embodiment, the pouring portion rotational torque Tn is 100 N·cm or more and 500 N·cm or less. The pouring portion rotational torque Tn is preferably 200 N·cm or more and 300 N·cm or less.

[0023] When removing the pouring cap 30 from the mouth part 21, when a user grips the pouring cap 30 and applies an upward force to the pouring cap 30, the outer cylinder part 33 shown in FIG. 1 elastically deforms radially outward, and the mouth part 21 elastically deforms radially inward. As a result, each convex part 35 is located radially outside each concave part 23. Therefore, when the user moves the pouring cap 30 upward with respect to the mouth part 21, the pouring cap 30 can be removed from the mouth part 21. When removing the pouring cap 30 from the mouth part 21, the user can more easily position each convex part 35 radially outside each concave part 23 by applying a radially outward force to the outer cylinder part 33 and elastically deforming the outer cylinder part 33 radially outward. In this case, the pouring cap 30 can be more easily removed from the mouth part 21. Also, when removing the pouring cap 30 from the mouth part 21, the user can move each convex part 35 outside each concave part 23 by applying a rotational torque greater than the pouring part rotational torque Tn in the circumferential direction to the pouring cap 30. After the user moves each convex part 35 outside each concave part 23, the user can remove the pouring cap 30 from the mouth part 21 by moving the pouring cap 30 upward.

[0024] As described above, when viewed axially, the opening area of the mouth part 21 is wider than the opening area of the pouring part 38. Therefore, the user can remove the pouring cap 30 from the mouth part 21 and refill the contents through the mouth part 21. Thereby, the burden of the user's work of refilling the contents can be reduced.

[0025] When attaching the pouring cap 30 to the mouth portion 21, the consumer moves the pouring cap 30 downward from the upper side of the mouth portion 21. At this time, since each convex portion 35 and the outer peripheral surface of the mouth portion 21 are in contact in the radial direction, the outer cylindrical portion 33 is elastically deformed outward in the radial direction, and the mouth portion 21 is elastically deformed inward in the radial direction. When the consumer moves the pouring cap 30 downward and each convex portion 35 and each concave portion 23 are opposed to each other in the radial direction, each convex portion 35 enters into each concave portion 23 by the restoring force of each of the outer cylindrical portion 33 and the mouth portion 21. Thereby, when each convex portion 35 is disposed inside each concave portion 23, the pouring cap 30 is attached to the mouth portion 21. Thus, the pouring cap 30 is detachably attached to the mouth portion 21.

[0026] In addition, in the present embodiment, the mouth portion 21 has a plurality of concave portions 23 and the outer cylindrical portion 33 has a plurality of convex portions 35, but the mouth portion 21 may have a plurality of convex portions and the outer cylindrical portion 33 may have a plurality of concave portions. In this case, each convex portion projects outward in the radial direction from the outer peripheral surface of the mouth portion 21, and each concave portion is recessed outward in the radial direction from the inner peripheral surface of the outer cylindrical portion 33. In this case, each convex portion of the mouth portion 21 is disposed inside each concave portion of the outer cylindrical portion 33. Thereby, similarly to the present embodiment, the pouring portion rotational torque Tn can be increased.

[0027] As shown in FIG. 1, the overcap 40 is cylindrical and extends axially about the central axis J. The overcap 40 is open at the lower side. The overcap 40 is detachably attached to the outer opening 37 of the pouring cap 30. When the user uses the contents stored inside the container 20, the overcap 40 is removed from the pouring cap 30, measures the amount of the contents to be used, and serves as a container for containing the contents to be used. In the present embodiment, the overcap 40 is made of resin. As the resin constituting the overcap 40, for example, an olefin-based thermoplastic synthetic resin such as polypropylene can be used. In the present embodiment, the overcap 40 is formed by injection molding, for example. By using polypropylene resin as the material of the overcap 40, an overcap 40 excellent in moldability, suitability for contents, and transparency can be formed, and thus excellent in metering performance. The overcap 40 has a cap main body portion 41, a cap inner cylinder portion 42, a flange portion 43, a cap seal portion 44, and a cap outer wall portion 45.

[0028] The cap main body portion 41 is substantially cylindrical and extends axially about the central axis J. Inside the cap main body portion 41, the upper portion of the pouring portion 38 is accommodated. The cap inner cylinder portion 42 is cylindrical and projects downward from the radially inner portion of the lower end of the cap main body portion 41. The cap inner cylinder portion 42 is substantially cylindrical about the central axis J. The cap inner cylinder portion 42 is disposed inside the outer opening 37 and the inner cylinder portion 31, respectively. The radial thickness of the cap inner cylinder portion 42 is thinner than the radial thickness of the cap main body portion 41.

[0029] The flange portion 43 is substantially an annular plate shape that spreads radially outward from the lower end of the cap main body portion 41. The cap seal portion 44 is substantially cylindrical and projects downward from the lower end of the cap main body portion 41. The cap seal portion 44 is disposed radially outside the cap inner cylinder portion 42 and radially inside the outer opening 37. The outer peripheral surface of the cap seal portion 44 is in radial contact with the inner peripheral surface of the outer opening 37.

[0030] The cap outer wall portion 45 extends downward from the radially outer edge of the flange portion 43. The cap outer wall portion 45 has a substantially cylindrical shape centered on the central axis J. The cap outer wall portion 45 is open at the lower side. The cap outer wall portion 45 surrounds the outer opening portion 37 of the pouring cap 30 from the radially outer side. A female screw portion 45a is provided on the inner peripheral surface of the cap outer wall portion 45. By screwing the female screw portion 45a and the male screw portion 37a provided on the outer opening portion 37 together, the overcap 40 is attached to the pouring cap 30. Further, by screwing the female screw portion 45a and the male screw portion 37a together, the cap seal portion 44 seals the outer opening portion 37 in a liquid-tight manner from the radially inner side.

[0031] In this embodiment, when a consumer removes the overcap 40 from the pouring cap 30 and when attaching the overcap 40 to the pouring cap 30, the rotational torque applied to the overcap 40 is about 70 N·cm. In the following description, such rotational torque is referred to as the overcap attachment / detachment torque Tm. Also, in this embodiment, in the manufacturing process of the container 10, when an operator attaches the overcap 40 to the pouring cap 30, the rotational torque applied to the overcap 40 is about 100 N·cm. In the following description, such rotational torque is referred to as the tightening torque Ts.

[0032] According to the present embodiment, the mouth portion 21 is cylindrical and extends along the central axis J of the container 20, and the pouring cap 30 is cylindrical and extends along the central axis J, and has an outer cylindrical portion 33 disposed radially outside the mouth portion 21. The outer cylindrical portion 33 projects radially and has a plurality of convex portions 35 arranged along the circumferential direction. The mouth portion 21 is recessed radially and has a plurality of concave portions 23 arranged along the circumferential direction. Each of the plurality of convex portions 35 is disposed inside a different concave portion 23. Therefore, as described above, when trying to rotate the pouring cap 30 in the circumferential direction with respect to the mouth portion 21, the outer surface of each convex portion 35 and the inner surface of each concave portion 23 come into contact in the circumferential direction, so that the pouring portion rotation torque Tn, which is the rotation torque for rotating the pouring cap 30 in the circumferential direction with respect to the mouth portion 21, can be increased. Thus, the pouring portion rotation torque Tn can be made larger than the overcap attachment / detachment torque Tm, which is the rotation torque applied to the overcap 40 when the consumer removes the overcap 40 from the pouring cap 30 and when attaching the overcap 40 to the pouring cap 30. Thereby, when attaching / detaching the overcap 40 with respect to the pouring cap 30, it is possible to prevent the pouring cap 30 from rotating together with the overcap 40. Also, as described above, the consumer can remove the pouring cap 30 from the mouth portion 21 by applying an upward force to the pouring cap 30 and moving the pouring cap 30 upward, and can attach the pouring cap 30 to the mouth portion 21 by moving the pouring cap 30 downward from above the mouth portion 21. Therefore, the consumer can attach / detach the pouring cap 30 with respect to the container 20. Thus, it is possible to attach / detach the pouring cap 30 with respect to the container 20 while preventing the pouring cap 30 from rotating together with the overcap 40. Therefore, as described above, since the consumer can refill the contents through the mouth portion 21, the burden of the work for the consumer to refill the contents can be reduced.

[0033] Also, in the present embodiment, as described above, when the pouring cap 30 is attached to the mouth portion 21, each convex portion 35 is disposed inside different concave portions 23. Therefore, when the pouring cap 30 tends to move upward with respect to the mouth portion 21, the convex portion 35 comes into axial contact with the surface facing downward among the inner surfaces of each concave portion 23. Thereby, when the consumer uses the container 10, it is possible to prevent the pouring cap 30 from coming off upward with respect to the mouth portion 21.

[0034] Also, in the present embodiment, as described above, the consumer can remove the pouring cap 30 from the container 20. Also, as described above, the pouring cap 30 and the container 20 are made of different resin materials. Therefore, when disposing of the container 10, the pouring cap 30 and the container 20 can be separated and disposed of, so that the recyclability can be improved.

[0035] Also, in the present embodiment, the pouring part rotational torque Tn is larger than the tightening torque Ts which is the rotational torque applied to the overcap 40 when an operator attaches the overcap 40 to the pouring cap 30 in the manufacturing process of the container 10. Therefore, in the manufacturing process of the container 10, it is possible to prevent the pouring cap 30 from rotating together with the overcap 40.

[0036] According to the present embodiment, the outer cylinder portion 33 has a plurality of convex portions 35, and the mouth portion 21 has a plurality of concave portions 23. Different from the configuration of the present embodiment, when the outer cylinder portion 33 has a plurality of concave portions and the mouth portion 21 has a plurality of convex portions, when removing the pouring cap 30 from the mouth portion 21 and refilling the contents through the mouth portion 21, if the contents spill outside the mouth portion 21, the contents may adhere to each convex portion. When the contents adhere to each convex portion, in a state where the pouring cap 30 is attached to the mouth portion 21, the frictional force between each convex portion and each concave portion may decrease, resulting in a possibility that the pouring portion rotation torque Tn becomes small. On the other hand, in the present embodiment, as described above, since the outer cylinder portion 33 has a plurality of convex portions 35 and the mouth portion 21 has a plurality of concave portions 23, when refilling the contents through the mouth portion 21, even if the contents spill outside the mouth portion 21, it is possible to suppress the contents from adhering to each convex portion 35. Thereby, it is possible to suppress a decrease in the frictional force between each convex portion 35 and each concave portion 23, so that it is easy to suppress the pouring portion rotation torque Tn from becoming small. Therefore, it is more preferable to suppress the pouring cap 30 from rotating together with the overcap 40.

[0037] According to the present embodiment, the ratio of the radial dimension Lo of the concave portion 23 to the radial thickness Ta of the mouth portion 21 is 50% or more. Therefore, it is possible to prevent the radial dimension Lo of the concave portion 23 from becoming too small. In addition, it is possible to prevent the radial dimension Lt of each convex portion 35 disposed inside each concave portion 23 from becoming too small. As a result, it is possible to prevent the area of the inner surface of each concave portion 23 that faces the convex portion 35 in the circumferential direction from becoming too small. Therefore, it is possible to prevent the pouring portion rotation torque Tn from becoming smaller than the overcap attachment / detachment torque Tm. Therefore, when attaching / detaching the overcap 40 to / from the pouring cap 30, it is more preferable to suppress the pouring cap 30 from rotating together with the overcap 40.

[0038] According to the present embodiment, when viewed from the axial direction, each of the plurality of convex portions 35 and the concave portions 23 has a semi-circular shape. Therefore, when viewed from the axial direction, it is easier to form each convex portion 35 when forming the container 20 as compared with the case where each convex portion 35 has a rectangular shape. Thereby, an increase in the number of manufacturing steps of the container 20 can be suppressed.

[0039] According to the present embodiment, the thickness Ta in the radial direction of the mouth portion 21 is 1.0 mm or more and 3.5 mm or less, the longitudinal elastic modulus (Young's modulus) of the mouth portion 21 is 500 MPa or more and 5000 MPa or less, the thickness Tc in the radial direction of the outer cylinder portion 33 is 0.5 mm or more and 2.5 mm or less, and the longitudinal elastic modulus (Young's modulus) of the outer cylinder portion 33 is 600 MPa or more and 4000 MPa or less. Therefore, it is possible to suppress the radial rigidity of each of the mouth portion 21 and the outer cylinder portion 33 from becoming too small or too large. Therefore, since it is possible to suppress the radial rigidity of each of the mouth portion 21 and the outer cylinder portion 33 from becoming too small, it is possible to suppress the radial elastic deformation amount of the mouth portion 21 and the outer cylinder portion 33 from becoming too large. Thereby, in a state where the pouring cap 30 is attached to the mouth portion 21, it is possible to suppress each convex portion 35 from radially coming off from the concave portion 23. Therefore, when the user uses the container 10, it is possible to suppress the pouring cap 30 from coming off upward with respect to the mouth portion 21. Further, since it is possible to suppress the radial rigidity of each of the mouth portion 21 and the outer cylinder portion 33 from becoming too large, it is possible to suppress the radial elastic deformation amount of the mouth portion 21 and the outer cylinder portion 33 from becoming too small when attaching and detaching the pouring cap 30 to and from the mouth portion 21. Therefore, the pouring cap 30 can be easily attached to and detached from the mouth portion 21.

[0040] According to the present embodiment, the pouring portion rotational torque Tn, that is, the rotational torque for rotating the pouring cap 30 in the circumferential direction with respect to the mouth portion 21, is 100 N·cm or more and 500 N·cm or less. Therefore, since the pouring portion rotational torque Tn can be made larger than the overcap attachment / detachment torque Tm, it is possible to suppress the pouring cap 30 from rotating together with the overcap 40 when attaching and detaching the overcap 40 to and from the pouring cap 30.

[0041] <First Modified Example> FIG. 3 is a cross-sectional view showing the container 210 of this modified example. In this modified example, the container 210 includes a container 220, a pouring cap 230, and an over cap 40 (see FIG. 1). In the following description, components having the same aspects as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0042] The container 220 has a storage portion 20a (see FIG. 1) and a mouth portion 221. The mouth portion 221 is cylindrical and extends along the central axis J. In this modified example, the mouth portion 221 is substantially cylindrical with the central axis J as the center. The mouth portion 221 has a plurality of recesses 23. In this modified example, the mouth portion 221 has two recesses 23. Each recess 23 is arranged along the circumferential direction. In this modified example, when viewed from the axial direction, each recess 23 has a semi-circular shape protruding radially inward. Other configurations of the container 220 in this modified example are the same as those of the container 20 in the above-described embodiment.

[0043] The pouring cap 230 is detachably attached to the mouth portion 221 of the container 220. The pouring cap 230 has an inner cylinder portion 31 (see FIG. 1), a bottom wall portion 32 (see FIG. 1), an outer cylinder portion 233, a connecting portion 36 (see FIG. 1), an outer mouth portion 37 (see FIG. 1), and a pouring portion 38 (see FIG. 1).

[0044] The outer cylinder part 233 is cylindrical and extends along the central axis J. The outer cylinder part 233 is cylindrical with the central axis J as the center. The outer cylinder part 233 is arranged radially outside the mouth part 221. The outer cylinder part 233 has a plurality of convex parts 35. In this modified example, the outer cylinder part 233 has two convex parts 35. Each convex part 35 is arranged along the circumferential direction. In this modified example, when viewed from the axial direction, each convex part 35 has a semi-circular shape protruding radially inward. Each convex part 35 is arranged inside a different concave part 23. Thereby, when trying to rotate the pouring cap 230 in the circumferential direction with respect to the mouth part 221, the outer surface of each convex part 35 and the inner surface of each concave part 23 come into contact in the circumferential direction, so that the pouring part rotation torque Tn can be increased. In this modified example, the pouring part rotation torque Tn is 100 N·cm or more and 500 N·cm or less. The pouring part rotation torque Tn is preferably 200 N·cm or more and 300 N·cm or less. The pouring part rotation torque Tn of this modified example is larger than the overcap attachment / detachment torque Tm. Other configurations and the like of the pouring cap 230 in this modified example are the same as those of the pouring cap 30 in the above-described embodiment. Other configurations and the like of the container 210 in this modified example are the same as those of the container 10 in the above-described embodiment.

[0045] In this modified example, the mouth part 221 has a plurality of concave parts 23, and the outer cylinder part 233 has a plurality of convex parts 35. Each convex part 35 is arranged inside a different concave part 23. Therefore, as described above, the pouring part rotation torque Tn can be made larger than the overcap attachment / detachment torque Tm. Accordingly, when attaching / detaching the overcap 40 to / from the pouring cap 230, it is possible to prevent the pouring cap 230 from rotating together with the overcap 40.

[0046] In addition, in this modified example, the mouth portion 221 has two recesses 23, and the outer cylindrical portion 233 has two protrusions 35. Therefore, compared with the above-described first embodiment in which the mouth portion 21 has eight recesses 23 and the outer cylindrical portion 33 has eight protrusions 35, since the number of recesses 23 and protrusions 35 is smaller, the pouring cap 230 can be removed from the mouth portion 221 more easily. Further, when attaching the pouring cap 330 to the mouth portion 221, since the number of protrusions 35 that come into contact with the outer peripheral surface of the mouth portion 221 can be reduced, the frictional force between the mouth portion 221 and the outer cylindrical portion 233 when moving the pouring cap 330 downward with respect to the mouth portion 221 can be reduced. Therefore, the pouring cap 230 can be attached to the mouth portion 221 more easily. As a result, the pouring cap 230 can be attached to and detached from the mouth portion 221 more easily.

[0047] <Second Modified Example> FIG. 4 is a cross-sectional view showing the container 310 of this modified example. In this modified example, the container 310 includes a container 320, a pouring cap 330, and an overcap 40 (see FIG. 1). In the following description, components having the same configuration as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0048] The container 320 has a storage portion 20a (see FIG. 1) and a mouth portion 321. The mouth portion 321 is cylindrical and extends along the central axis J. In this modified example, the mouth portion 321 is substantially cylindrical with the central axis J as the center. The mouth portion 321 has a plurality of recesses 323. In this modified example, the mouth portion 321 has eight recesses 323. Each recess 323 is arranged along the circumferential direction. In this modified example, when viewed from the axial direction, each recess 323 has a triangular shape with one vertex protruding radially inward. The inner surface of each recess 323 is planar and faces in a direction inclined radially outward from the circumferential direction. Other configurations of the container 320 in this modified example are the same as those of the container 20 in the above-described embodiment.

[0049] The pouring cap 330 is detachably attached to the mouth portion 321 of the container 320. The pouring cap 330 has an inner cylinder portion 31 (see FIG. 1), a bottom wall portion 32 (see FIG. 1), an outer cylinder portion 333, a connecting portion 36 (see FIG. 1), an outer mouth portion 37 (see FIG. 1), and a pouring portion 38 (see FIG. 1).

[0050] The outer cylinder portion 333 is cylindrical and extends along the central axis J. The outer cylinder portion 333 is cylindrical with the central axis J as the center. The outer cylinder portion 333 has a plurality of convex portions 335. In this modification, the outer cylinder portion 333 has eight convex portions 335. Each convex portion 335 is arranged along the circumferential direction. In this modification, when viewed from the axial direction, each convex portion 335 has a triangular shape with one vertex protruding radially inward. Each convex portion 335 is disposed inside a different concave portion 323. The outer surface of each convex portion 335 is planar and faces in a direction inclined from the circumferential direction radially inward. The outer surface of each convex portion 335 faces the inner surface of the concave portion 323. Thus, when attempting to rotate the pouring cap 330 circumferentially with respect to the mouth portion 321, the outer surface of each convex portion 335 is likely to catch on the inner surface of each concave portion 323, so that the pouring portion rotation torque Tn can be more suitably increased compared to the container 10 of the embodiment. In this modification, the pouring portion rotation torque Tn is 100 N·cm or more and 500 N·cm or less. The pouring portion rotation torque Tn is preferably 200 N·cm or more and 300 N·cm or less. The pouring portion rotation torque Tn of this modification is greater than the overcap attachment / detachment torque Tm. Other configurations and the like of the pouring cap 330 of this modification are the same as those of the pouring cap 30 of the above-described embodiment. Other configurations and the like of the container 310 of this modification are the same as those of the container 10 of the above-described embodiment.

[0051] According to this modification example, when viewed from the axial direction, each of the plurality of convex portions 335 and the plurality of concave portions 323 has a triangular shape. Therefore, as described above, since the planar outer surface of each convex portion 335 and the planar inner surface of the concave portion 323 can be opposed to each other, the pouring-out portion rotation torque Tn can be more suitably increased. As a result, the pouring-out portion rotation torque Tn can be made more suitably larger than the overcap attachment / detachment torque Tm. Therefore, when attaching / detaching the overcap 40 to / from the pouring-out cap 330, it is possible to more suitably suppress the pouring-out cap 330 from rotating together with the overcap 40.

[0052] <Third Modification Example> FIG. 5 is a cross-sectional view showing the container 410 of this modification example. In this modification example, the container 410 includes a container 420, a pouring-out cap 430, and an overcap 40 (see FIG. 1). In the following description, components having the same aspects as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0053] The container 420 has a housing portion 20a (see FIG. 1) and a mouth portion 421. The mouth portion 421 is cylindrical and extends along the central axis J. In this modification example, the mouth portion 421 has a substantially cylindrical shape centered on the central axis J. The mouth portion 421 has a plurality of concave portions 423. In this modification example, the mouth portion 421 has eight concave portions 423. Each concave portion 423 is arranged along the circumferential direction. In this modification example, when viewed from the axial direction, each concave portion 423 has a square shape. Each concave portion 423 has an inner surface 423a facing the circumferential direction. Other configurations of the container 420 in this modification example are the same as those of the container 20 in the above-described embodiment.

[0054] The pouring-out cap 430 is detachably attached to the mouth portion 421 of the container 420. The pouring-out cap 430 has an inner cylinder portion 31 (see FIG. 1), a bottom wall portion 32 (see FIG. 1), an outer cylinder portion 433, a connecting portion 36 (see FIG. 1), an outer mouth portion 37 (see FIG. 1), and a pouring-out portion 38 (see FIG. 1).

[0055] The outer cylindrical portion 433 is cylindrical and extends along the central axis J. The outer cylindrical portion 433 is cylindrical with the central axis J as the center. The outer cylindrical portion 433 has a plurality of convex portions 435. In this modified example, the outer cylindrical portion 433 has eight convex portions 435. Each convex portion 435 is arranged along the circumferential direction. In this modified example, when viewed from the axial direction, each convex portion 435 is quadrangular. Each convex portion 435 is arranged inside a different concave portion 423. Each convex portion 435 has an outer surface 435a facing the circumferential direction. The outer surface 435a of each convex portion 435 faces the inner surface 423a of the concave portion 423 in the circumferential direction. Therefore, when attempting to rotate the pouring cap 430 in the circumferential direction with respect to the mouth portion 421, the outer surface 435a of each convex portion 435 comes into circumferential contact with the inner surface 423a of each concave portion 423. Thus, compared with the container 10 of the embodiment, the pouring portion rotation torque Tn can be more suitably increased. In this modified example, the pouring portion rotation torque Tn is 100 N·cm or more and 500 N·cm or less. Preferably, the pouring portion rotation torque Tn is 200 N·cm or more and 300 N·cm or less. The pouring portion rotation torque Tn of this modified example is greater than the overcap attachment / detachment torque Tm. Other configurations and the like of the pouring cap 430 of this modified example are the same as those of the pouring cap 30 of the above-described embodiment. Other configurations and the like of the container 410 of this modified example are the same as those of the container 10 of the above-described embodiment.

[0056] According to this modified example, when viewed from the axial direction, each of the plurality of convex portions 435 and the plurality of concave portions 423 is quadrangular. Thus, as described above, since the outer surface 435a of each convex portion 435 and the inner surface 423a of the concave portion 423 face each other in the circumferential direction, the pouring portion rotation torque Tn can be more suitably increased. Thereby, the pouring portion rotation torque Tn can be made more suitably larger than the overcap attachment / detachment torque Tm. Therefore, when attaching / detaching the overcap 40 to / from the pouring cap 430, it is possible to more suitably suppress the pouring cap 430 from rotating together with the overcap 40.

[0057] <Fourth Modified Example> FIG. 6 is a cross-sectional view showing the container 510 of this modified example. In this modified example, the container 510 includes a container 520, a pouring cap 530, and an over cap 40 (see FIG. 1). In the following description, components having the same aspects as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0058] The container 520 has a storage portion 20a (see FIG. 1) and a mouth portion 521. The mouth portion 521 is cylindrical and extends along the central axis J. In this modified example, the mouth portion 521 is substantially cylindrical with the central axis J as the center. The mouth portion 521 has a plurality of recesses 523. In this modified example, the mouth portion 521 has eight recesses 523. Each recess 523 is arranged along the circumferential direction. In this modified example, the plurality of recesses 523 includes a plurality of first recesses 523a, 523b, 523c, 523d, second recesses 523e, 523f, and third recesses 523g, 523h. In this embodiment, the plurality of recesses 523 includes four first recesses 523a, 523b, 523c, 523d, two second recesses 523e, 523f, and two third recesses 523g, 523h. When viewed from the axial direction, each of the first recesses 523a, 523b, 523c, 523d is triangular with one vertex protruding radially inward. When viewed from the axial direction, the shapes of the first recesses 523a, 523b, 523c, 523d are the same as each other. When viewed from the axial direction, each of the second recesses 523e, 523f is rectangular. When viewed from the axial direction, each of the third recesses 523g, 523h is semi-circular protruding radially inward. In this modified example, the plurality of recesses 523 are arranged in the order of the first recess 523a, the third recess 523g, the first recess 523b, the first recess 523c, the second recess 523f, the first recess 523d, the third recess 523h, and the second recess 523e toward one side (+θ side) in the circumferential direction.

[0059] In this modified example, the plurality of recesses 523 includes a plurality of adjacent recesses 524 arranged adjacent to each of the first recesses 523a, 523b, 523c, 523d on one side in the circumferential direction. In this modified example, the plurality of adjacent recesses 524 are the first recess 523c, the second recess 523f, and the third recesses 523g, 523h. Therefore, when viewed from the axial direction, the shape of the first recess 523c, which is one of the adjacent recesses 524, is different from the shapes of the second recess 523f and the third recesses 523g, 523h, which are the other adjacent recesses 524. Also, when viewed from the axial direction, the shape of the second recess 523f, which is one of the adjacent recesses 524, is different from the shapes of the first recess 523c and the third recesses 523g, 523h, which are the other adjacent recesses 524. Due to these, the shape of the mouth portion 521 when viewed from the axial direction is a rotationally asymmetric shape centered on the central axis J depending on the shapes of the plurality of recesses 523 when viewed from the axial direction and the circumferential arrangement of the plurality of recesses 523. In the present embodiment, the rotationally asymmetric shape centered on the central axis J means a shape in which when a certain member is rotated around the central axis J, the shape of the certain member when viewed from the axial direction becomes the same shape as the shape before rotation only after a 360° rotation. Other configurations and the like of the container 520 in this modified example are the same as those of the container 20 in the above-described embodiment.

[0060] The pouring cap 530 is detachably attached to the mouth portion 521 of the container 520. The pouring cap 530 has an inner cylinder portion 31 (see FIG. 1), a bottom wall portion 32 (see FIG. 1), an outer cylinder portion 533, a connecting portion 36 (see FIG. 1), an outer mouth portion 37 (see FIG. 1), and a pouring portion 38 (see FIG. 1).

[0061] The outer cylindrical portion 533 is cylindrical and extends along the central axis J. The outer cylindrical portion 533 is cylindrical with the central axis J as the center. The outer cylindrical portion 533 has a plurality of convex portions 535. In this modified example, the outer cylindrical portion 533 has eight convex portions 535. Each convex portion 535 is arranged along the circumferential direction. In this modified example, the plurality of convex portions 535 includes a plurality of first convex portions 535a, 535b, 535c, 535d, second convex portions 535e, 535f, and third convex portions 535g, 535h. In this embodiment, the plurality of convex portions 535 includes four first convex portions 535a, 535b, 535c, 535d, two second convex portions 535e, 535f, and two third convex portions 535g, 535h. When viewed from the axial direction, each of the first convex portions 535a, 535b, 535c, 535d is triangular with one vertex protruding radially inward. When viewed from the axial direction, the shapes of the first convex portions 535a, 535b, 535c, 535d are the same as each other. When viewed from the axial direction, each of the second convex portions 535e, 535f is square-shaped. When viewed from the axial direction, each of the third convex portions 535g, 535h is semi-circular protruding radially inward.

[0062] In this modified example, the plurality of convex portions 535 are arranged in the order of the first convex portion 535a, the third convex portion 535g, the first convex portion 535b, the first convex portion 535c, the second convex portion 535f, the first convex portion 535d, the third convex portion 535h, and the second convex portion 535e toward one side (+θ side) in the circumferential direction. Each of the first convex portions 535a, 535b, 535c, 535d is arranged inside a different first concave portion 523a, 523b, 523c, 523d. Each of the second convex portions 535e, 535f is arranged inside a different second concave portion 523e, 523f. Each of the third convex portions 535g, 535h is arranged inside a different third concave portion 523g, 523h. Therefore, when viewed from the axial direction, the shape of each of the plurality of concave portions 523 is the same as the shape of the convex portion 535 arranged inside each of the plurality of concave portions 523.

[0063] In this modification example, the plurality of convex portions 535 include a plurality of adjacent convex portions 536 that are arranged adjacent to each of the first convex portions 535a, 535b, 535c, 535d on one side (+θ side) in the circumferential direction. In this modification example, the plurality of adjacent convex portions 536 are the first convex portion 535c, the second convex portion 535f, and the third convex portions 535g, 535h. Therefore, when viewed from the axial direction, the shape of the first convex portion 535c, which is one adjacent convex portion 536, is different from the shapes of the second convex portion 535f and the third convex portions 535g, 535h, which are the other adjacent convex portions 536. Also, when viewed from the axial direction, the shape of the second convex portion 535f, which is one adjacent convex portion 536, is different from the shapes of the first convex portion 535c and the third convex portions 535g, 535h, which are the other adjacent convex portions 536. Due to these, the shape of the outer cylindrical portion 533 when viewed from the axial direction is a rotationally asymmetric shape centered on the central axis J depending on the shapes of the plurality of convex portions 535 when viewed from the axial direction and the circumferential arrangement of each of the plurality of convex portions 535. Therefore, by arranging each convex portion 535 inside a different concave portion 523, the circumferential position of the pouring cap 530 with respect to the mouth portion 521 can be uniquely determined. That is, the circumferential position of the pouring cap 530 with respect to the container 520 can be uniquely determined. As described above, in this modification example, the accommodating portion 20a of the container 520 is in a substantially square cylindrical shape centered on the central axis J and is substantially rectangular when viewed from the axial direction. Therefore, for example, when one surface that faces in a direction orthogonal to the axial direction and has a long dimension in the direction orthogonal to the axial direction among the outer surfaces of the accommodating portion 20a is taken as the front surface, even if the attachment and detachment of the pouring cap 530 with respect to the mouth portion 521 are repeatedly performed, the direction of the front surface and the direction of the opening of the pouring portion 38 can be uniquely determined. Other configurations and the like of the pouring cap 530 in this modification example are the same as those of the pouring cap 30 in the above-described embodiment. Other configurations and the like of the container 510 in this modification example are the same as those of the container 10 in the above-described embodiment.

[0064] According to this modification example, when viewed from the axial direction, the shape of each of the plurality of recesses 523 is the same as the shape of the protrusions 535 arranged inside each of the plurality of recesses 523, and the shape of the outer cylindrical portion 533 when viewed from the axial direction is an axially asymmetric shape centered on the central axis J depending on the shape of each of the plurality of protrusions 535 when viewed from the axial direction and the circumferential arrangement of each of the plurality of protrusions 535. Therefore, as described above, even if the attachment and detachment of the pouring cap 530 to and from the mouth portion 521 are repeated, the circumferential position of the pouring cap 530 with respect to the container 520 can be uniquely determined. Thereby, it is possible to suppress a change in the relationship between the orientation of the front surface of the container 520 and the orientation of the opening of the pouring portion 38. Thus, before and after the attachment and detachment of the pouring cap 530 to and from the mouth portion 521, even if a consumer holds the container 520 from the same direction with respect to the front surface of the container 520 and pours out the contents, the pouring portion 38 can guide the pouring of the contents to the outside of the container body 10. Therefore, by attaching and detaching the pouring cap 530 to and from the mouth portion 521, it is possible to suppress a deterioration in the usability of the container body 10.

[0065] In addition, if the shapes of the mouth portion 521 and the outer cylindrical portion 533 can be made axially asymmetric shapes centered on the central axis J, the shape and circumferential arrangement of each recess 523 and the shape and circumferential arrangement of each protrusion 535 are not limited to this modification example. For example, each recess 523 may include only the first recess and the second recess, or may include a recess having a shape different from the first recess, the second recess, and the third recess. Similarly, each protrusion 535 may include only the first protrusion and the second protrusion, or may include a protrusion having a shape different from the first protrusion, the second protrusion, and the third protrusion. Also, the shape of the first recess and the shape of the first protrusion are not limited to triangular shapes, and may be other shapes such as semi-circular shapes. Furthermore, the number of the first recesses and the number of the first protrusions are not limited to four, and may be three or less or five or more. Also, the adjacent protrusions may be protrusions arranged adjacent to each of the plurality of first protrusions on the other side (-θ side) in the circumferential direction. Also, the circumferential intervals between the protrusions 535 arranged adjacent to each other in the circumferential direction may be different from each other.

[0066] As described above, the preferred embodiments of the present invention have been explained. Needless to say, the present invention is not limited to such examples. When the pouring cap is rotated in the circumferential direction with respect to the mouth portion, if the pouring portion rotation torque can be increased, those skilled in the art can obtain the above-described effects based on this index. In addition, the various shapes and combinations of the respective constituent members shown in the above-described examples are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

[0067] The shapes of the plurality of concave portions and the shapes of the plurality of convex portions may be other shapes such as an elliptical shape. Also, the number of concave portions of the mouth portion and the number of convex portions of the outer cylinder portion may be two or more, and the number of concave portions and the number of convex portions may be different from each other.

Explanation of Reference Numerals

[0068] 10, 210, 310, 410, 510... containers, 20, 220, 320, 420, 520... containers, 21, 221, 321, 421, 521... mouth portions, 23, 323, 423, 523... concave portions, 30, 230, 330, 430, 530... pouring caps, 31... inner cylinder portions, 32... bottom wall portions, 33, 233, 333, 433, 533... outer cylinder portions, 35, 335, 435, 535... convex portions, 36... connecting portions, 37... outer mouth portions, 38... pouring portions, 40... over caps, 41... cap main body portions, 42... cap inner cylinder portions, 43... flange portions, 44... cap seal portions, 45... cap outer wall portions, J... central axis

Claims

1. A container having an opening at the upper side for accommodating contents, and a dispensing cap detachably attached to the opening, and comprising the opening is cylindrical extending along the central axis of the container, the dispensing cap is cylindrical extending along the central axis, and has an outer cylinder portion disposed radially outside the opening about the central axis, either one of the opening and the outer cylinder portion projects in the radial direction and has a plurality of convex portions arranged along the circumferential direction about the central axis, the other of the opening and the outer cylinder portion is recessed in the radial direction and has a plurality of concave portions arranged along the circumferential direction, each of the plurality of convex portions is disposed inside a different one of the plurality of concave portions, a container.

2. The outer cylinder portion has the plurality of convex portions, the opening has the plurality of concave portions, the container according to Claim 1.

3. The ratio of the radial dimension of the concave portion to the radial thickness of the opening is 50% or more, the container according to Claim 2.

4. When viewed from the axial direction which is the direction in which the central axis extends, each of the plurality of convex portions and the plurality of concave portions is semi-circular, the container according to any one of Claims 1 to 3.

5. When viewed from the axial direction which is the direction in which the central axis extends, each of the plurality of convex portions and the plurality of concave portions is triangular, the container according to any one of Claims 1 to 3.

6. When viewed from the axial direction which is the direction in which the central axis extends, each of the plurality of convex portions and the plurality of concave portions is square, the container according to any one of Claims 1 to 3.

7. When viewed from the axial direction which is the direction in which the central axis extends, the shape of each of the plurality of concave portions is the same as the shape of the convex portion disposed inside each of the plurality of concave portions, the shape of the outer cylinder portion when viewed from the axial direction is a rotationally asymmetric shape about the central axis by the shape of each of the plurality of convex portions when viewed from the axial direction and the circumferential arrangement of each of the plurality of convex portions, the container according to any one of Claims 1 to 3.

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