Container with cap

Abstract

To provide a container body with a cap suppressed in deformation of an inner cylinder and leakage of inner liquid in the container body.SOLUTION: In a container body with a cap, an inner peripheral surface of a mouth 12 has a first inner peripheral surface 15 positioned at an upper end part and extending downward from an upper end opening edge 12a, and is provided, at a cap top wall part 19, with an inner cylinder 21 projected downward and inserted into the mouth, and an outer cylinder 22 projected downward and abutting on an outer peripheral surface of the mouth. An outer peripheral surface of the inner cylinder has a first outer peripheral surface 23 extending downward from a lower surface of a top wall part and abutting on the first inner peripheral surface. The first outer peripheral surface presses the first inner peripheral surface toward outside in a radial direction, and elastically deforms an upper end of the mouth toward outside in the radial direction. An upper side projection 22a and a lower side projection 22b are formed on an inner peripheral surface of the outer cylinder in this order. The upper side projection extends continuously over the whole length in a circumferential direction, and abuts on an outer peripheral surface of the upper end part of the mouth, and the lower projection abuts on an outer peripheral surface of the upper end part of the mouth, or is located closely.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a container body with a cap.

Background Art

[0002] Conventionally, for example, as shown in Patent Document 1 below, there is provided a container body for containing a content liquid, and a capped cylindrical cap screwed onto the mouth of the container body. An inner cylinder protruding downward and fitted into the mouth is provided on the top wall of the cap. A container body with a cap is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional container body with a cap, when the internal pressure of the container body rises or an impact force is applied, for example, after filling the content liquid, the inner cylinder may deform and the content liquid in the container body may leak. / / 这里原日文表述似乎有误,根据语境推测修改为上述内容。

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a container body with a cap that can suppress deformation of the inner cylinder and leakage of the content liquid in the container body even when the internal pressure of the container body rises or an impact force is applied.

Means for Solving the Problems

[0006] The present invention employs the following means to solve the above problems. That is, the capped container body of the present invention comprises a container body that contains liquid contents, and a top cylindrical cap screwed onto the mouth of the container body, wherein the inner circumferential surface of the mouth comprises a first inner circumferential surface located at the upper end and extending downward from the upper opening edge of the mouth, a first stepped surface extending radially inward from the lower end of the first inner circumferential surface, and a second inner circumferential surface extending downward from the radial inner end of the first stepped surface, wherein the top wall of the cap is provided with an inner cylinder protruding downward and inserted into the mouth, and an outer cylinder protruding downward and in contact with the outer circumferential surface of the mouth, wherein the outer circumferential surface of the inner cylinder extends downward from the lower surface of the top wall and in contact with the first inner circumferential surface, a second stepped surface extending radially inward from the lower end of the first outer circumferential surface, and the radial direction of the second stepped surface The outer cylinder comprises a second outer peripheral surface extending downward from the inner end, the first outer peripheral surface pressing the first inner peripheral surface radially outward, elastically deforming the upper end of the mouth radially outward, a vertical gap is provided between the second stepped surface and the first stepped surface, the second outer peripheral surface abuts against or is close to the second inner peripheral surface, an upper projection and a lower projection are formed on the inner peripheral surface of the outer cylinder in this order from top to bottom, the upper projection extends continuously along the entire length in the circumferential direction and abuts against the outer peripheral surface of the upper end of the mouth, the lower projection abuts against or is close to the outer peripheral surface of the upper end of the mouth, and a thin-walled portion is formed in the top wall portion that is surrounded by the inner cylinder when viewed from the vertical direction, the thin-walled portion extends continuously along the entire length in the circumferential direction and is formed in an annular shape with width in the radial direction The thin-walled portion is formed with the lower surface of the top wall portion recessed upward, and the portion of the lower surface of the top wall portion that connects the inner circumferential surface of the inner cylinder and the thin-walled portion includes a first connecting surface extending downward from the lower surface of the thin-walled portion and a second connecting surface extending radially inward from the inner circumferential surface of the inner cylinder and connected to the first connecting surface via a corner. .

[0007] According to the present invention, an inner cylinder and an outer cylinder are provided on the top wall of the cap, and the upper end of the mouth is held radially by the inner cylinder and the outer cylinder. Therefore, even if the internal pressure of the container increases or an impact force is applied, for example, the mouth is less likely to deform radially outward, and it is possible to suppress the deformation of the inner cylinder in a direction away from the inner circumferential surface of the mouth, thereby improving the airtightness inside the container. Since a vertical gap is provided between the first stepped surface of the mouth and the second stepped surface of the inner cylinder, even if the liquid contents of the container enter between the outer surface of the inner cylinder and the inner surface of the mouth, it can be kept in the space between the first and second stepped surfaces, making it difficult for it to reach the first inner surface and the first outer surface which are in contact with each other, thereby suppressing leakage of the liquid contents of the container. If the second outer surface of the inner cylinder and the second inner surface of the mouth are in contact with each other, then even if the inner cylinder is deformed by an impact force, for example, at least one of the first and second outer surfaces can seal the space between itself and the inner surface of the mouth, further improving the airtightness inside the container. If the second outer surface of the inner cylinder and the second inner surface of the mouth are close to each other with a small gap between them, the cap can be easily attached to the mouth. An upper projection and a lower projection are formed on the inner circumferential surface of the outer cylinder, extending in that order from top to bottom. The upper projection, which extends continuously along the entire length of the circumferential direction, abuts against the outer circumferential surface of the upper end of the mouth, while the lower projection abuts against or is close to the outer circumferential surface of the upper end of the mouth. Therefore, while ensuring a seal between the outer cylinder and the mouth, the contact area between the inner circumferential surface of the outer cylinder and the outer circumferential surface of the upper end of the mouth can be reduced, thereby suppressing the torque required to attach and detach the cap from the mouth. Since a thin-walled portion is formed in the top wall portion that is surrounded by the inner cylinder when viewed from above and below, when the internal pressure of the container increases, the thin-walled portion can be deformed upward, thereby suppressing the internal pressure of the container and reliably preventing the inner cylinder from deforming in a direction that moves radially away from the inner circumferential surface of the opening. Since the thin-walled section is formed with the lower surface of the top wall recessed upward, when the internal pressure of the container increases, the thin-walled section can be deformed in a responsive manner, which reliably suppresses deformation of the inner cylinder and prevents deterioration of appearance. On the lower surface of the top wall, the portion connecting the inner circumferential surface of the inner cylinder and the thin-walled portion comprises a first connecting surface extending downward from the lower surface of the thin-walled portion and a second connecting surface extending radially inward from the inner circumferential surface of the inner cylinder and connected to the first connecting surface via a corner, and is formed in the shape of a circumferentially extending protruding rib. Therefore, when the internal pressure of the container increases, it is possible to reliably suppress the deformation of the inner cylinder in a direction away from the inner circumferential surface of the mouth, and the propagation of deformation of the thin-walled portion to the inner cylinder.

[0008] The upper and lower protrusions may be located in the same vertical position as the first outer circumferential surface.

[0009] Since the upper and lower projections are located in the same vertical position as the first outer peripheral surface of the inner cylinder, the outer peripheral surface of the upper end of the mouth, which is elastically deformed radially outward by the first outer peripheral surface, can be reliably pressed against the upper projection, thereby ensuring a secure seal between the outer cylinder and the mouth.

[0012] The thin-walled portion may be formed in the part of the top wall that is radially inward from the inner cylinder.

[0013] In this case, since the thin-walled portion is formed in the part of the top wall that is radially inward from the inner cylinder, when the internal pressure of the container increases, it is possible to suppress the deformation of the inner cylinder by following the deformation of the thin-walled portion, thereby reliably improving the airtightness inside the container.

[0018] A sealing projection may be provided on the lower surface of the top wall portion, in the portion located between the inner cylinder and the outer cylinder, projecting downward and contacting the upper opening edge of the mouth portion.

[0019] In this case, a sealing projection is provided on the lower surface of the top wall that protrudes downward and abuts against the upper opening edge of the mouth, making it possible to seal the space between the lower surface of the top wall and the upper opening edge of the mouth, thereby reliably improving the airtightness inside the container. [Effects of the Invention]

[0020] According to this invention, even if the internal pressure of the container increases or an impact force is applied, for example, deformation of the inner cylinder and leakage of the liquid contents inside the container can be suppressed. [Brief explanation of the drawing]

[0021] [Figure 1] This is a partial longitudinal cross-sectional view of a capped container body shown as one embodiment of the present invention. [Figure 2] Figure 1 is a magnified view of the container body with a cap. [Modes for carrying out the invention]

[0022] Hereinafter, with reference to the drawings, an embodiment of the present invention will be described. As shown in FIG. 1, the capped container body 1 according to this embodiment includes a container body 11 that houses the content liquid, and a capped cylindrical cap 13 screwed onto the mouth 12 of the container body 11. The mouth 12 is formed as a wide mouth having an inner diameter of, for example, 30 mm or more, preferably 30 mm or more and 50 mm or less. In the illustrated example, the inner diameter of the mouth 12 is about 42 mm.

[0023] The container body 11 is formed in a bottomed cylindrical shape, and the container body 11 and the cap 13 are arranged coaxially with a common axis (central axis) O. The side of the mouth 12 of the container body 11 along the common axis O is referred to as the upper side, and the bottom side of the container body 11 is referred to as the lower side. The direction along the common axis O is referred to as the vertical direction. When viewed from the vertical direction, the direction intersecting the common axis O is referred to as the radial direction, and the direction of orbiting around the common axis O is referred to as the circumferential direction.

[0024] As shown in FIG. 2, the inner peripheral surface of the mouth 12 includes a first inner peripheral surface 15, a first stepped surface 16, and a second inner peripheral surface 17.

[0025] The first inner peripheral surface 15 is located at the upper end of the mouth 12 and extends downward from the upper end opening edge 12a of the mouth 12. The upper end opening edge of the mouth 12 faces upward and is a flat surface that extends continuously over the entire circumferential length. The first inner peripheral surface 15 extends substantially straight in the vertical direction.

[0026] The first stepped surface 16 extends from the lower end of the first inner peripheral surface 15 toward the inside in the radial direction. The first stepped surface 16 extends downward as it goes toward the inside in the radial direction. Note that the first stepped surface 16 may extend straight in the radial direction. The connecting portion between the first stepped surface 16 and the first inner peripheral surface 15 is formed in a curved surface shape that is recessed toward the outside in the radial direction. In a longitudinal sectional view along the vertical direction, the length of the first stepped surface 16 is shorter than the length of the first inner peripheral surface 15. Note that in the longitudinal sectional view, the length of the first stepped surface 16 may be equal to or longer than the length of the first inner peripheral surface 15.

[0027] The second inner circumferential surface 17 extends downward from the radial inner end of the first stepped surface 16. The second inner circumferential surface 17 extends almost straight in the vertical direction. The connection portion between the second inner circumferential surface 17 and the first stepped surface 16 is formed in a curved shape that bulges radially inward. The vertical positions of the upper end of the second inner circumferential surface 17 and the upper end of the male thread formed on the outer circumferential surface of the opening 12 are equivalent to each other.

[0028] A female threaded portion is formed on the inner circumferential surface of the peripheral wall portion 18 of the cap 13, which screws into the male threaded portion formed on the outer circumferential surface of the mouth portion 12. The portion of the upper surface of the top wall portion 19 of the cap 13 that is located radially inward from the outer peripheral edge portion 19a is concave downward. Alternatively, the entire upper surface of the top wall portion 19 may be formed flat.

[0029] The top wall portion 19 is provided with an inner cylinder 21 that protrudes downward and is inserted into the opening portion 12, and an outer cylinder 22 that protrudes downward and abuts against the outer circumferential surface of the opening portion 12.

[0030] The inner circumferential surface of the inner cylinder 21 extends straight in the vertical direction along its entire length. The outer circumferential surface of the inner cylinder 21 includes a first outer circumferential surface 23, a second stepped surface 24, and a second outer circumferential surface 25.

[0031] The first outer peripheral surface 23 extends downward from the lower surface of the top wall portion 19 and abuts against the first inner peripheral surface 15 of the mouth portion 12. In the longitudinal cross-sectional view, before the cap 13 is attached to the mouth portion 12, the first outer peripheral surface 23 exhibits a curved shape that protrudes radially outward. The first outer peripheral surface 23 abuts against the first inner peripheral surface 15 in a state of radial compression deformation. The first outer peripheral surface 23 pushes the first inner peripheral surface 15 radially outward, causing the upper end of the mouth portion 12 to elastically deform radially outward.

[0032] The second stepped surface 24 extends radially inward from the lower end of the first outer peripheral surface 23. The second stepped surface 24 extends downward as it moves radially inward. The second stepped surface 24 may also extend straight radially. In the longitudinal section view, the second stepped surface 24 extends substantially parallel to the first stepped surface 16. A vertical gap is provided between the second stepped surface 24 and the first stepped surface 16. The connection portion between the second stepped surface 24 and the first outer peripheral surface 23 is formed in a curved shape that bulges radially outward. In the longitudinal section view, the length of the second stepped surface 24 is shorter than the length of the first outer peripheral surface 23. In the longitudinal section view, the length of the second stepped surface 24 may be greater than or equal to the length of the first outer peripheral surface 23.

[0033] The second outer circumferential surface 25 extends downward from the radial inner end of the second stepped surface 24. The second outer circumferential surface 25 is in contact with or close to the second inner circumferential surface 17. The upper part of the second outer peripheral surface 25, in the state before the cap 13 is attached to the mouth portion 12, exhibits a curved shape that protrudes radially outward in the longitudinal cross-sectional view. The upper part of the second outer peripheral surface 25 is in contact with the second inner peripheral surface 17 of the mouth portion 12 in a state of radial compression deformation. The lower part of the second outer circumferential surface 25 extends radially inward as it goes downward, and moves radially inward from the second inner circumferential surface 17. The entire second outer surface 25 may be in contact with the second inner surface 17, or it may be in close proximity with a small gap in the radial direction.

[0034] The outer cylinder 22 is radially separated inward from the inner circumferential surface of the peripheral wall portion 18 of the cap 13. The lower end of the outer cylinder 22 is located above the lower end of the inner cylinder 21. The lower end of the outer cylinder 22 is located above the second stepped surface 24 of the inner cylinder 21. The outer surface of the outer cylinder 22 extends straight in the vertical direction along its entire length. The upper part of the inner circumferential surface of the outer cylinder 22 extends straight in the vertical direction, while the lower part extends radially outward as it goes downward. The upper part of the inner circumferential surface of the outer cylinder 22 abuts against the outer circumferential surface of the mouth 12. The lower part of the inner circumferential surface of the outer cylinder 22 is radially separated from the outer circumferential surface of the mouth 12. The lower part of the inner circumferential surface of the outer cylinder 22 is formed in a curved shape that protrudes radially inward.

[0035] An upper projection 22a and a lower projection 22b are formed on the inner circumferential surface of the outer cylinder 22, in that order from top to bottom. The upper projection 22a and the lower projection 22b are formed on the upper part of the inner circumferential surface of the outer cylinder 22. The upper projection 22a and the lower projection 22b are located in the same vertical position as the first outer circumferential surface 23 of the inner cylinder 21. The upper projection 22a abuts against the outer circumferential surface of the upper end of the mouth 12, and the lower projection 22b abuts against or is close to the outer circumferential surface of the upper end of the mouth 12. The upper projection 22a and the lower projection 22b each extend continuously along the entire length of the outer cylinder 22 in the circumferential direction. The lower projection 22b may extend intermittently along the entire length of the outer cylinder 22 in the circumferential direction.

[0036] The upper projection 22a and the lower projection 22b, in the longitudinal cross-sectional view before the cap 13 is attached to the mouth portion 12, exhibit a curved surface shape that protrudes radially inward. The upper projection 22a and the lower projection 22b are in contact with the outer circumferential surface of the upper end of the mouth portion 12 when compressed radially. The lower projection 22b may be separated radially outward from the outer circumferential surface of the upper end of the mouth portion 12.

[0037] On the lower surface of the top wall portion 19, a sealing projection 35 is provided in the portion located between the inner cylinder 21 and the outer cylinder 22, projecting downward and abutting against the upper end opening edge 12a of the mouth portion 12. The sealing projection 35 extends continuously along its entire circumferential length. The lower end of the sealing projection 35 is formed in a curved shape that protrudes downward. The sealing projection 35 is radially separated from the inner cylinder 21 and the outer cylinder 22.

[0038] A thin-walled portion 26 is formed in the surrounding portion 19b of the top wall 19, which is surrounded by the inner cylinder 21 when viewed from above and below. However, it is not necessary to form the thin-walled portion 26 on the top wall 19.

[0039] The thin-walled portion 26 is formed in the top wall portion 19, in a part that is radially inward from the inner cylinder 21. The thin-walled portion 26 may also be provided in the portion of the top wall portion 19 that is vertically connected to the inner circumferential surface of the inner cylinder 21. The thin-walled portion 26 is formed on the outer peripheral edge of the surrounding portion 19b. The thin-walled portion 26 may also be formed, for example, in the radially central part of the top wall portion 19. The thin-walled portion 26 extends continuously along its entire circumferential length and has a radial width. The thin-walled portion 26 is arranged coaxially with the common axis O. The width of the thin-walled portion 26 is greater than its thickness. The width of the thin-walled portion 26 is smaller than the radius of the portion of the top wall portion 19 enclosed by the thin-walled portion 26 when viewed from the vertical direction. The thin-walled portion 26 may be, for example, scattered at multiple locations within the surrounding portion 19b, or it may be formed integrally over the entire area of ​​the surrounding portion 19b.

[0040] The thin-walled portion 26 is formed by the lower surface of the top wall portion 19 being recessed upward. Alternatively, the thin-walled portion 26 may be formed by the upper surface of the top wall portion 19 being recessed downward. On the lower surface of the top wall portion 19, the connecting portion 27 that connects the inner circumferential surface of the inner cylinder 21 and the thin-walled portion 26 comprises a first connecting surface 31 extending downward from the lower surface of the thin-walled portion 26, and a second connecting surface 32 extending radially inward from the inner circumferential surface of the inner cylinder 21 and connected to the first connecting surface 31 via a first corner portion (corner portion) 33.

[0041] The connection portion between the inner circumferential surface of the inner cylinder 21 and the second connecting surface 32 is formed in a curved shape that is recessed radially outward. In the longitudinal cross-sectional view, the lengths of the first connecting surface 31 and the second connecting surface 32 are equal to each other. On the lower surface of the top wall portion 19, the inner surface 34, which is located radially inward from the first connecting surface 31 and extends downward from the lower surface of the thin-walled portion 26, and the main surface portion 36, which is located radially inward from the thin-walled portion 26 and faces downward, are connected via the second corner portion 37. In the longitudinal cross-sectional view, the angles of the second corner portion 37 and the first corner portion 33 are approximately 90°.

[0042] As described above, in the container body 1 with a cap according to this embodiment, an inner cylinder 21 and an outer cylinder 22 are provided on the top wall portion 19 of the cap 13, and the upper end of the mouth portion 12 is held radially by the inner cylinder 21 and the outer cylinder 22. Therefore, even if the internal pressure of the container body 11 increases or an impact force is applied, for example, the mouth portion 12 is less likely to deform radially outward, and the deformation of the inner cylinder 21 away from the inner circumferential surface of the mouth portion 12 is suppressed, thereby improving the airtightness inside the container body 11.

[0043] Since a vertical gap is provided between the first stepped surface 16 of the mouth 12 and the second stepped surface 24 of the inner cylinder 21, even if the liquid contents inside the container 11 enter the space between the outer surface of the inner cylinder 21 and the inner surface of the mouth 12, it will remain in the space between the first stepped surface 16 and the second stepped surface 24, making it difficult for it to reach the space between the first inner surface 15 and the first outer surface 23 which are in contact with each other, thereby suppressing leakage of the liquid contents inside the container 11.

[0044] Since the second outer surface 25 of the inner cylinder 21 and the second inner surface 17 of the mouth 12 are in contact with each other, even if the inner cylinder 21 is deformed due to an impact force, for example, at least one of the first outer surface 23 and the second outer surface 25 can seal the space between itself and the inner surface of the mouth 12, thereby further improving the airtightness inside the container body 11. Furthermore, if the second outer surface 25 of the inner cylinder 21 and the second inner surface 17 of the mouth portion 12 are close to each other with a small gap in the radial direction, the cap 13 can be easily attached to the mouth portion 12.

[0045] An upper projection 22a and a lower projection 22b are formed on the inner circumferential surface of the outer cylinder 22 in that order from top to bottom. The upper projection 22a, which extends continuously along the entire length in the circumferential direction, abuts against the outer circumferential surface of the upper end of the mouth 12, while the lower projection 22b abuts against or is close to the outer circumferential surface of the upper end of the mouth 12. Therefore, while ensuring a seal between the outer cylinder 22 and the mouth 12, the contact area between the inner circumferential surface of the outer cylinder 22 and the outer circumferential surface of the upper end of the mouth 12 can be reduced, thereby suppressing the torque required to attach and detach the cap 13 to the mouth 12.

[0046] Since the upper projection 22a and the lower projection 22b are located in the same vertical position as the first outer peripheral surface 23 of the inner cylinder 21, the outer peripheral surface of the upper end of the mouth 12, which is elastically deformed radially outward by the first outer peripheral surface 23, can be reliably pressed against the upper projection 22a, thereby ensuring a secure seal between the outer cylinder 22 and the mouth 12.

[0047] Since a thin-walled portion 26 is formed in the surrounding portion 19b of the top wall 19, which is surrounded by the inner cylinder 21 when viewed from above and below, when the internal pressure of the container body 11 rises, the thin-walled portion 26 can be deformed upward, thereby suppressing the internal pressure of the container body 11 and reliably preventing the inner cylinder 21 from deforming in a direction away from the inner circumferential surface of the mouth portion 12 in the radial direction.

[0048] Since the thin-walled portion 26 is formed in the part of the top wall portion 19 that is radially inward from the inner cylinder 21, when the internal pressure of the container body 11 increases, it is possible to suppress the deformation of the inner cylinder 21 by following the deformation of the thin-walled portion 26, thereby reliably improving the airtightness inside the container body 11.

[0049] Since the thin-walled portion 26 is formed by the lower surface of the top wall portion 19 being recessed upward, when the internal pressure of the container body 11 increases, the thin-walled portion 26 can be deformed in a responsive manner, thereby reliably suppressing deformation of the inner cylinder 21 and preventing deterioration of appearance.

[0050] On the lower surface of the top wall portion 19, the connecting portion 27 connecting the inner circumferential surface of the inner cylinder 21 and the thin-walled portion 26 comprises a first connecting surface 31 extending downward from the lower surface of the thin-walled portion 26 and a second connecting surface 32 extending radially inward from the inner circumferential surface of the inner cylinder 21 and connected to the first connecting surface 31 via a first corner portion 33, and is formed in the shape of a circumferentially extending protruding rib. Therefore, when the internal pressure of the container body 11 increases, it is possible to reliably suppress the deformation of the inner cylinder 21 in a direction away from the inner circumferential surface of the mouth portion 12, and the propagation of deformation of the thin-walled portion 26 to the inner cylinder 21.

[0051] Since a sealing projection 35 is provided on the lower surface of the top wall portion 19, which protrudes downward and abuts against the upper opening edge 12a of the mouth portion 12, it becomes possible to seal the space between the lower surface of the top wall portion 19 and the upper opening edge 12a of the mouth portion 12, thereby reliably improving the airtightness inside the container body 11.

[0052] Since the thin-walled portion 26 is formed continuously along the entire length of the outer peripheral edge of the surrounding portion 19b in the circumferential direction, when the internal pressure of the container body 11 increases, it becomes possible to deform the entire surrounding portion 19b upward, starting from the thin-walled portion 26, and it is possible to more reliably suppress the deformation of the inner cylinder 21 away from the inner circumferential surface of the mouth portion 12 in the radial direction.

[0053] Furthermore, the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0054] For example, a configuration without the sealing projection 35 may be adopted. The upper projection 22a and the lower projection 22b may be located below the first outer peripheral surface 23 of the inner cylinder 21.

[0055] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above embodiments and modifications may be combined as appropriate. [Explanation of Symbols]

[0056] 1. Container with cap 11 Container 12 Mouth 12a Upper opening edge 13 caps 15 First inner surface 16 1st step surface 17 Second inner surface 19 Top wall 21 Inner cylinder 22 Outer cylinder 22a Upper projection 22b Lower protrusion 23 First outer peripheral surface 24 2nd step surface 25 Second outer peripheral surface 26 Thin-walled section 31 First connection surface 32 Second connection surface 33. First corner (corner) 35 Seal protrusions

Claims

1. A container body that holds the liquid contents, The container body comprises a top-shaped cylindrical cap that is screwed onto the mouth of the container body, The inner circumferential surface of the aforementioned opening is A first inner circumferential surface located at the upper end and extending downward from the upper end opening edge of the mouth, A first stepped surface extending radially inward from the lower end of the first inner circumferential surface, The first stepped surface comprises a second inner circumferential surface extending downward from the radial inner end of the first stepped surface, On the top wall of the aforementioned cap, An inner cylinder that protrudes downward and is inserted into the opening, An outer cylinder is provided that protrudes downward and abuts against the outer circumferential surface of the opening, The outer surface of the inner cylinder is A first outer peripheral surface extending downward from the lower surface of the top wall portion and in contact with the first inner peripheral surface, A second stepped surface extending radially inward from the lower end of the first outer surface, The second stepped surface comprises a second outer peripheral surface extending downward from the radial inner end of the second stepped surface, The first outer circumferential surface presses the first inner circumferential surface radially outward, and elastically deforms the upper end of the opening radially outward. A vertical gap is provided between the second stepped surface and the first stepped surface. The second outer surface is in contact with or close to the second inner surface. An upper projection and a lower projection are formed on the inner circumferential surface of the outer cylinder in this order, from top to bottom. The aforementioned upper projection extends continuously along its entire length in the circumferential direction and abuts against the outer circumferential surface of the upper end of the opening. The lower projection abuts against or is close to the outer circumferential surface of the upper end of the mouth portion. A thin-walled portion is formed in the upper wall portion that is surrounded by the inner cylinder when viewed from above and below. The thin-walled portion extends continuously along its entire length in the circumferential direction and is formed in an annular shape with width in the radial direction. The aforementioned thin-walled portion is formed by the lower surface of the top wall portion being recessed upward, On the lower surface of the top wall portion, the portion connecting the inner circumferential surface of the inner cylinder and the thin-walled portion is A first connecting surface extending downward from the lower surface of the thin-walled portion, A container body with a cap, comprising: a second connecting surface extending radially inward from the inner circumferential surface of the inner cylinder and connected to the first connecting surface via a corner.

2. The container body with a cap according to claim 1, wherein the upper projection and the lower projection are located in the same vertical position as the first outer peripheral surface.

3. The container body with a cap according to claim 1 or 2, wherein the thin-walled portion is formed in the portion of the top wall that is radially separated inward from the inner cylinder.

4. A capped container body according to any one of claims 1 to 3, wherein a sealing projection is provided on the lower surface of the top wall portion, in a portion located between the inner cylinder and the outer cylinder, projecting downward and contacting the upper end opening edge of the mouth portion.

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