Cap unit and container with cap

Abstract

The present application provides a cap unit capable of preventing pressure rise in a container body and easily and safely performing unpinning. The cap unit is mounted to a container body having an upper opening, and includes an outer cap covering an upper opening portion of the container body, an inner cap inserted into an inner side of the container body from the upper opening portion of the container body, and a waterproof packing located at an outer peripheral portion of the inner cap to seal between the inner side of the container body and the inner cap. The waterproof packing is composed of a ring-shaped elastic sealing member abutting against a protruding portion protruding from the inner side of the container body in a whole circumference. The waterproof packing is mounted to the inner cap in a state of fitting with a ring-shaped groove portion provided at the outer peripheral portion of the inner cap. A pressure release portion is provided at the outer peripheral portion of the inner cap, and releases pressure in the container body when the pressure in the container body rises to a predetermined pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to a cap unit and a container with a cap. BACKGROUND

[0002] In the past, there has been a container with a cap (a plug body) that closes an upper opening portion of a container body by being fitted to a neck portion of the container body that is installed to the upper opening portion. In addition, there has been a container with a cap that maintains a heat retaining or heat insulating function by having a container body with a vacuum heat insulating structure. For example, in such a container with a cap, a structure is adopted in which an inner cap and an outer cap are used to close the upper opening portion of the container body (for example, refer to Patent Documents 1 and 2).

[0003] Specifically, the container with a cap described in Patent Documents 1 and 2 has an inner cap that closes the opening portion in a state of being fitted to the inside of the container body from the upper opening portion of the container body, a waterproof packing that seals between the container body and the inner cap in a state of being installed to the inner cap, and an outer cap that is detachably installed to the container body by screwing in a state of covering the upper opening portion of the container body from the outside. The outer cap, when installed to the container body, restricts movement of the inner cap to the upper side by abutting against the inner cap.

[0004] Patent Document 1: Japanese Patent No. 5494717

[0005] Patent Document 2: Japanese Patent No. 5841220

[0006] However, in the above-described conventional container with a cap, for example, when high-temperature contents are put in the inside of the container body, or when gas is generated due to putrefaction of the contents in the container body, as the pressure in the container body sealed by the inner cap and the outer cap rises (becomes positive), the inner cap becomes pressed by the outer cap.

[0007] At this time, the tightening force generated between the container body and the outer cap due to screwing increases, and thus it is sometimes difficult to rotate the outer cap to a direction of being taken out (a plug opening direction). In addition, when the outer cap is taken out (the plug is opened), the pressure in the container body is released sharply, and thus a large sound is sometimes emitted, or the inner cap flies to the upper side. SUMMARY

[0008] The present application has been made in view of the above-described conventional situation, and aims to provide a cap unit that can prevent the pressure in a container body from rising and easily and safely perform plug opening, and a container with a cap that can further improve convenience of use by having such a cap unit.

[0009] To achieve the above-described object, the present application provides the following solutions.

[0010] 〔1〕A lid unit which is attached to a container body having an upper opening, the lid unit being characterized by comprising:

[0011] an outer lid which covers the upper opening of the container body;

[0012] an inner lid which is inserted from the upper opening of the container body to the inside of the container body; and

[0013] a waterproof packing which is provided at the outer peripheral portion of the inner lid to seal the inside of the container body from the inner lid,

[0014] the waterproof packing being composed of a ring-shaped elastic sealing member which abuts against a protruding portion protruding from the inside of the container body all around, the waterproof packing being attached to the inner lid in a state of being fitted into a ring-shaped groove provided at the outer peripheral portion of the inner lid,

[0015] a pressure release portion being provided at the outer peripheral portion of the inner lid, the pressure release portion releasing the pressure in the container body when the pressure in the container body rises to a predetermined pressure.

[0016] 〔2〕A lid unit which is attached to a container body having an upper opening, the lid unit being characterized by comprising:

[0017] an outer lid which covers the outside of the container body;

[0018] a middle plug which is inserted from the upper opening of the container body to the inside of the container body; and

[0019] a waterproof packing which is provided at the outer peripheral portion of the middle plug to seal the inside of the container body from the middle plug,

[0020] the waterproof packing being composed of a ring-shaped elastic sealing member which abuts against a protruding portion protruding from the inside of the container body all around, the waterproof packing being attached to the middle plug in a state of being fitted into a ring-shaped groove provided at the outer peripheral portion of the middle plug,

[0021] a pressure release portion being provided at the outer peripheral portion of the middle plug, the pressure release portion releasing the pressure in the container body when the pressure in the container body rises to a predetermined pressure.

[0022] 〔3〕A lid unit which is attached to a container body having an upper opening, the lid unit being characterized by comprising:

[0023] a lid body which is attached to the neck portion of the container body and which is provided with a liquid passage hole which communicates with the inside of the container body; and

[0024] a lid body that is attached to the lid main body in a detachable manner by screwing and that opens and closes the liquid passage,

[0025] The lid main body has:

[0026] an inner cylindrical portion that is inserted into the inside of the container main body from the upper opening of the container main body; and

[0027] a waterproof packing that is provided on the outer peripheral portion of the inner cylindrical portion and that seals the inside of the container main body from the inner cylindrical portion,

[0028] The waterproof packing is composed of a ring-shaped elastic sealing member that abuts against a protruding portion that protrudes from the inside of the container main body in its entirety, and is attached to the inner cylindrical portion in a state of being fitted into a ring-shaped groove portion provided on the outer peripheral portion of the inner cylindrical portion,

[0029] The lid body has:

[0030] an outer lid that covers the outside of the lid main body;

[0031] a middle peg that is provided on the central portion of the inside of the outer lid and that closes the liquid passage in a state of being inserted into the inside of the lid main body; and

[0032] a lid packing that is provided on the outer peripheral portion of the middle peg and that seals the inside of the lid main body from the middle peg,

[0033] The lid packing is composed of a ring-shaped elastic sealing member that abuts against the inner peripheral surface of the lid main body in its entirety, and is attached to the middle peg in a state of being fitted into a ring-shaped groove portion provided on the outer peripheral portion of the middle peg,

[0034] A pressure release portion is provided on the outer peripheral portion of at least one of the inner cylindrical portion and the middle peg, and releases the pressure in the container main body when the pressure in the container main body rises to a predetermined pressure.

[0035] 〔4〕 The lid unit according to any one of the above-described 〔1〕 to 〔3〕, characterized in that,

[0036] The pressure release portion has a recess or a notch portion that communicates with the inside of the container main body via the groove portion,

[0037] The elastic sealing member separates the groove portion from the recess or the notch portion in a state in which the elastic sealing member is fitted into the groove portion,

[0038] When the pressure in the container body rises to a predetermined pressure, the elastic sealing member is elastically deformed, and the groove portion and the recess or notch portion are brought into communication, whereby the pressure in the container body is released to the outside from the recess or notch portion.

[0039] [5] The lid unit according to the above [4], characterized in that

[0040] The recess or notch portion is provided so as to recess or notch at least a part of a side surface of an upper side of the groove portion.

[0041] [6] The lid unit according to the above [4] or [5], characterized in that

[0042] The recess or notch portions are arranged at equal intervals in the circumferential direction of the groove portion.

[0043] [7] A container with a lid, wherein

[0044] The lid unit according to any one of the above [1] to [6]; and

[0045] A container body for mounting the lid unit.

[0046] [8] The container with a lid according to the above [7], characterized in that

[0047] The container body has a vacuum heat-insulating structure.

[0048] As described above, according to the present application, it is possible to provide a lid unit capable of preventing the pressure in a container body from rising and easily and safely performing unpinning, and a container with a lid capable of further improving the convenience of use by being provided with such a lid unit. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is a sectional view showing the structure of a container with a lid provided with the lid unit according to the first embodiment of the present application.

[0050] Figure 2 is an exploded perspective view of the lid unit and the container body shown in Figure 1 from the lower side.

[0051] Figure 3 is a side view showing the structure of an inner lid provided in the lid unit shown in Figure 1

[0052] Figure 4 is a sectional view showing the structure of a container with a lid provided with the lid unit according to the second embodiment of the present application.

[0053] Figure 5 is an exploded perspective view of the lid unit and the container body shown in​Figure 4 An exploded perspective view of the cap unit and the container body.

[0054] Figure 6 is a sectional view showing the structure of a cap unit according to the third embodiment of the present application. Figure 4 is a side view showing the structure of the cap unit.

[0055] Figure 7 is a sectional view showing the structure of a cap unit according to the third embodiment of the present application.

[0056] Figure 8 is a view showing the cap unit from the lower side. Figure 7 An exploded perspective view of the cap unit and the container body.

[0057] Figure 9 is a view showing the cap unit from the lower side. Figure 7 is an exploded perspective view of the cap body and the waterproof packing provided in the cap unit.

[0058] Figure 10 is a sectional view showing the structure of a cap unit according to the third embodiment of the present application. Figure 9 is a side view showing the structure of the cap body.

[0059] Figure 11 is a view showing the cap unit from the lower side. Figure 7 is an exploded perspective view of the cap body and the waterproof packing provided in the cap unit.

[0060] Figure 12 is a sectional view showing the structure of a cap unit according to the third embodiment of the present application. Figure 11 is a side view showing the structure of the cap body.

[0061] Explanation of Reference Numerals

[0062] 1A, 1B, 1C... lid unit; 2A, 2B, 2C... container main body; 3... outer container; 4... inner container; 5... vacuum heat insulation layer; 6... inner threaded portion; 7... protruding portion; 8... outer lid; 9... inner lid; 10... waterproof packing (elastic sealing member); 11... middle peg; 12... vent hole; 13... peg body; 14... outer threaded portion; 15... groove portion; 16... heat insulation material; 17... elastic snap portion; 18... insertion groove; 20... pressure release portion; 20a... cutout portion; 30... lid main body; 31... outer lid; 32... middle peg; 33... waterproof packing (elastic sealing member); 34... outer threaded portion; 35... groove portion; 40... pressure release portion; 40a... recess; 50... liquid passage hole; 51... lid main body; 52... lid body; 53... outer cylindrical portion; 54... inner cylindrical portion; 55... waterproof packing (elastic sealing member); 56... outer threaded portion; 57... groove portion; 58... outer lid; 59... middle peg; 60... lid packing (elastic sealing member); 61... heat insulation material; 62... inner threaded portion; 63... outer threaded portion; 64... groove portion; 70... pressure release portion; 70a... recess; 70b... recess; 100A, 100B, 100C... capped container. DETAILED DESCRIPTION

[0063] Hereinafter, an embodiment of the present application will be described in detail with reference to the drawings.

[0064] (First Embodiment)

[0065] First, as the first embodiment of the present application, for example, a capped container 100A provided with a lid unit 1A as shown in FIG. 1A will be described. Figures 1 to 3

[0066] Further, Figure 1 is a sectional view showing the structure of the capped container 100A provided with the lid unit 1A. Figure 2 is an exploded perspective view of the lid unit 1A and the container main body 2A viewed from the lower side. Figure 3 is a side view showing the structure of the inner lid provided in the lid unit 1A.

[0067] As shown in FIGS. 1A to 1C and FIGS. 2A to 2C, the capped container 100A of the present embodiment is provided with the lid unit 1A of the present embodiment, and the container main body 2A to which the lid unit 1A is attached and detached. Figure 1 Figure 2 The capped container 100A is a mug (beverage container) capable of keeping a beverage substance (content) housed in the container main body 2A warm by the container main body 2A having a vacuum heat insulation structure.

[0068] The capped container 100A is a mug (beverage container) capable of keeping a beverage substance (content) housed in the container main body 2A warm by the container main body 2A having a vacuum heat insulation structure.

[0069] ​​Specifically, the container body 2A is composed of a double-layered container, having a bottomed cylindrical outer container 3 made of, for example, stainless steel, and an inner container 4, with their openings joined together in such a state that the inner container 4 is housed inside the outer container 3.

[0070] In addition, a vacuum insulation layer 5 is provided between the outer container 3 and the inner container 4. The vacuum insulation layer 5 can be formed, for example, by blocking the exhaust hole located at the center of the bottom surface of the outer container 3 in a chamber that has been depressurized (evacuated) to a high vacuum.

[0071] The container body 2A has: a generally circular bottom 2a, a cylindrical body portion 2b that rises from the outer periphery of the bottom 2a in a generally cylindrical shape, and a generally cylindrical neck portion 2c that narrows at the upper side of the cylindrical body portion 2b. In addition, the upper end of the neck portion 2c has a circular opening as the upper opening portion 2d of the container body 2A.

[0072] In addition, an internal thread 6 is provided on the inner circumferential surface of the neck portion 2c (inner container 4). Furthermore, below the internal thread 6, an annular protrusion 7 is provided protruding from the inner circumference of the inner container 4 (container body 2A) all around the circumference.

[0073] Furthermore, the container body 2A has a generally cylindrical shape, but the shape of the container body 2A is not particularly limited and can be appropriately modified according to size, appearance design, etc. In addition, the outer peripheral surface of the container body 2A can be coated, printed, etc.

[0074] like Figures 1 to 3 As shown, the cover unit 1A of this embodiment includes: an outer cover 8 that covers the upper opening 2d of the container body 2A; an inner cover 9 that is inserted into the inner side of the container body 2A from the upper opening 2d; a waterproof sealing member 10 located on the outer periphery of the inner cover 9 to seal the inner side of the container body 2A and the inner cover 9; a central plug 11 located in the center of the inner side of the outer cover 8 and inserted into the inner side of the inner cover 9; and a plug body 13 located in the center of the bottom surface of the central plug 11 to close the vent 12 provided in the center of the bottom surface of the inner cover 9.

[0075] The outer cover 8 is made of a heat-resistant resin such as polypropylene, and has a peripheral wall portion 8a that is roughly cylindrical and has the same outer diameter as the cylindrical portion 2b of the container body 2A, and an upper wall portion 8b that closes the upper part of the peripheral wall portion 8a.

[0076] The inner cover 9 is made of a heat-resistant resin such as polypropylene, and has a generally circular bottom wall portion 9a and a generally cylindrical peripheral wall portion 9b that rises from the outer periphery of the bottom wall portion 9a. In addition, an annular upper flange portion 9c is provided all over the circumference of the upper end side of the outer peripheral surface of the peripheral wall portion 9b.

[0077] An outer screw thread portion 14 is provided on the outer peripheral surface of the peripheral wall portion 9b (inner lid 9) to be screwed with the inner screw thread portion 6 on the container main body 2A side. In the lid unit 1A, the inner lid 9 is detachably attached to the container main body 2A by screwing of the inner screw thread portion 6 and the outer screw thread portion 14.

[0078] Further, the inner screw thread portion 6 and the outer screw thread portion 14 are constituted by double threads which are complementary to each other. In the case of using double threads, the inner lid 9 can be attached to and detached from the container main body 2A with a small number of rotation operations (about 180° in the present embodiment).

[0079] The waterproof packing 10 is constituted by, for example, a ring-shaped elastic sealing member of a rubber such as silicone rubber or an elastomer, and the like, which has heat resistance. The waterproof packing 10 is detachably attached to the inner lid 9 in a state of being fitted in a ring-shaped groove portion 15 provided on the outer peripheral portion of the inner lid 9.

[0080] On the other hand, the waterproof packing 10 is capable of being removed from the inner lid 9 by elastically deforming (stretching) itself. Thus, the inner lid 9 and the waterproof packing 10 can be separately and individually washed, and the inner lid 9 and the waterproof packing 10 can be kept hygienic.

[0081] Further, an elastic flange portion 10a is provided on the outer peripheral portion of the waterproof packing 10. The elastic flange portion 10a has a shape of being bent downward from the upper end of the outer peripheral surface of the waterproof packing 10 and protruding over the entire circumference.

[0082] When the inner lid 9 is fitted inside the container main body 2A, the waterproof packing 10 becomes a state of being in contact with the projecting portion 7 of the container main body 2A while elastically deforming the elastic flange portion 10a, and thus is in a state of being in close contact with the projecting portion 7 over the entire circumference. Thus, the inside of the container main body 2A and the inner lid 9 can be made airtight (waterproof) by the waterproof packing 10.

[0083] The middle plug 11 is constituted by, for example, a heat-resistant resin such as polypropylene, and has a substantially cylindrical shape with a bottom, and is integrally attached to the lower surface central portion of the upper wall portion 8b (outer lid 8) by welding or the like. A heat insulating material 16 constituted by, for example, a foamed polyurethane resin or the like is arranged as a heat insulating layer on the inside of the middle plug 11. Further, as the heat insulating layer, air (void) can be used instead of the heat insulating material 16.

[0084] An elastic snap portion 17 is provided on the upper portion of the peripheral wall portion 9b (inner lid 9) by cutting a portion of the peripheral wall portion 9b in the up-down direction. On the other hand, an insertion groove 18 for insertion of the inner lid 9 is provided on the outer peripheral surface of the middle plug 11. In the lid unit 1A, when the inner lid 9 is fitted in the outer lid 8, the elastic snap portion 17 is fitted in the insertion groove 18 while elastically deforming, and thus the inner lid 9 is detachably attached to the middle plug 11.

[0085] A circular vent hole 12 is provided in the central portion of the bottom wall portion 9a of the inner lid 9. On the other hand, a plug body 13 is provided in the central portion of the bottom surface of the middle plug 11 to close the vent hole 12.

[0086] The plug body 13 is made of, for example, a rubber having heat resistance such as silicone rubber, an elastic member, or the like. The plug body 13 has a protruding portion 13a in which the central portion is bulged in a dome shape, a flange portion 13b extending in a diameter expanding direction from the periphery of the protruding portion 13a, a cylindrical portion 13c protruding in a cylindrical shape from the side opposite to the protruding portion 13a, and a ring-shaped groove portion 13d obtained by cutting the outer peripheral surface of the cylindrical portion 13c.

[0087] On the other hand, the middle plug 11 has, in the central portion of the bottom surface thereof, an insertion recess portion 11a into which the cylindrical portion 13c is fitted, and an insertion protruding portion 11b protruding from the inner peripheral surface of the insertion recess portion 11a and fitted into the groove portion 13d. Thus, the plug body 13 is detachably attached to the central portion of the bottom surface of the middle plug 11.

[0088] In the lid unit 1A, when the inner lid 9 is attached to the middle plug 11 by screwing, the protruding portion 13a of the plug body 13 is brought into abutment with the periphery of the vent hole 12 while being elastically deformed, whereby the vent hole 12 can be closed. In addition, in the lid unit 1A, the plug body 13 can be removed from the middle plug 11, and the middle plug 11 and the plug body 13 can be cleaned separately, so that these middle plug 11 and plug body 13 can be kept hygienic.

[0089] However, in the lid unit 1A of the present embodiment, a pressure releasing portion 20 is provided in the outer peripheral portion of the inner lid 9, which releases the pressure in the container main body 2A when the pressure in the container main body 2A rises to a predetermined pressure.

[0090] Further, as the case where the pressure in the container main body 2A rises (becomes positive), for example, there can be mentioned a case where high-temperature contents are put in the inside of the container main body 2A, a case where gas is generated when the contents in the container main body 2A are rotten, and the like.

[0091] The pressure releasing portion 20 has a recess or cutout portion (cutout portion in the present embodiment) 20a which communicates with the inside of the container main body 2A via the groove portion 15. Specifically, the cutout portion 20a is provided to cut a portion of the side surface of the outer peripheral portion of the inner lid 9 at least on the upper side where the groove portion 15 is formed.

[0092] Further, the number of cutout portions 20a can be one or a plurality. In the case where a plurality of cutout portions 20a are provided, it is preferable that they are arranged at equal intervals in the circumferential direction of the groove portion 15. In addition, the width in the circumferential direction of the cutout portion 20a is preferably set within an angle range of 60° or less, because if it is too wide, it becomes a cause of leakage.

[0093] In the lid unit 1A of the present embodiment, in a state where the waterproof packing 10 is fitted in the groove portion 15, the waterproof packing 10 partitions between the groove portion 15 and the cutout portion 20a. In addition, the inside of the container main body 2A and the inner lid 9 become a state of being sealed (waterproofed) by the waterproof packing 10.

[0094] When the pressure in the container main body 2A rises to a prescribed pressure (for example, 200 kPa or more and 800 kPa or less) from this state, the waterproof packing 10 elastically deforms, and the groove portion 15 and the cutout portion 20a become a state of being in communication. Thereby, the pressure in the container main body 2A is released to the outside from the cutout portion 20a.

[0095] Further, in a case where a plurality of cutout portions 20a are provided, by respectively changing the size of the width in the circumferential direction, it is also possible to adjust the set value of the pressure at which the waterproof packing 10 elastically deforms.

[0096] On the other hand, after the pressure in the container main body 2A is released, the waterproof packing 10 elastically returns, thereby partitioning between the groove portion 15 and the cutout portion 20a. Thereby, the inside of the container main body 2A and the inner lid 9 again become a state of being sealed (waterproofed).

[0097] Therefore, in the container with lid 100A provided with the lid unit 1A of the present embodiment, as the pressure in the container main body 2A rises, the fastening force that is generated between the inner screw portion 6 on the container main body 2A side and the outer screw portion 14 on the inner lid 9 side due to screwing increases, whereby the outer lid 8 does not become difficult to rotate in the unpinning direction, and thus it is possible to easily remove the lid unit 1A from the container main body 2A.

[0098] In addition, in the container with lid 100A of the present embodiment, it is possible to avoid the lid unit 1A flying upward due to the rising pressure in the container main body 2A when the lid unit 1A is removed from the container main body 2A.

[0099] As described above, in the container with lid 100A of the present embodiment, it is possible to prevent the pressure in the container main body 2A from rising, and easily and safely unpin the lid unit 1A. In addition, it is possible to maintain the sealing property well by the waterproof packing 10, and improve the operability when unpinning the lid unit 1A. Therefore, in the container with lid 100A provided with such a lid unit 1A, it is possible to achieve further improvement in the convenience of use.

[0100] Further, in the lid unit 1A of the present embodiment, a structure is adopted in which the inner lid 9 is detachably attached to the above-described container main body 2A by screwing, but a structure can also be adopted in which the outer lid 8 is detachably attached to the container main body 2A by screwing.

[0101] (Second Embodiment)

[0102] Next, as a second embodiment of the present invention, for example, regarding... Figures 4 to 6 The lidded container 100B with lid unit 1B shown will be described.

[0103] also, Figure 4 This is a cross-sectional view showing the structure of a covered container 100B with a cover unit 1B. Figure 5 This is an exploded perspective view of the cover unit 1B and the container body 2B from the bottom side. Figure 6 This is a side view showing the structure of the cover unit 1B. Furthermore, in the following description, parts equivalent to the cover unit 1A and the container body 2A described above are omitted, and the same reference numerals are used in the accompanying drawings.

[0104] like Figure 4 and Figure 5 As shown, the lidded container 100B of this embodiment includes a lid unit 1B of this embodiment and a container body 2B on which the lid unit 1B is detachably mounted.

[0105] The lidded container 100B is a thermos (beverage container) that can keep hot beverages (contents) contained in the container body 2B warm through the container body 2B having a vacuum insulation structure.

[0106] Specifically, the container body 2B has a structure that is basically the same as the container body 2A, except that the cylindrical body is longer than the container body 2A and gradually expands in diameter upwards.

[0107] like Figures 4 to 6 As shown, in this embodiment, the cover unit 1B constitutes a plug that closes the upper opening 2d of the container body 2B. Specifically, the cover unit 1B includes a cover body 30, which is screwed onto the container body 2B to cover the upper opening 2d of the container body 2B.

[0108] The cover body 30 has: an outer cover 31 that covers the upper opening 2d of the container body 2B; a middle plug 32 located in the center of the inner side of the outer cover 31 and inserted into the inner side of the container body 2B from the upper opening 2d; and a waterproof sealing member 33 located on the outer periphery of the middle plug 32 to seal the inner side of the container body 2B with the middle plug 32.

[0109] The outer cover 31 is made of heat-resistant resins such as polypropylene and Tritan (registered trademark), and has a peripheral wall portion 31a that is formed in a generally cylindrical shape in a manner that is continuous with the cylindrical portion 2b of the container body 2B, and an upper wall portion 31b that closes the upper part of the peripheral wall portion 30a.

[0110] The middle plug 32 is made of, for example, a heat-resistant resin such as polypropylene, Tritan (registered trademark), or the like, and has a substantially circular bottom wall portion 32a and a substantially cylindrical peripheral wall portion 32b that stands from the periphery of the bottom wall portion 32a.

[0111] The middle plug 32 is located in the inner central portion of the outer lid 31, and the peripheral wall portion 32b is integrally attached to the lower surface central portion of the upper wall portion 31b by welding or the like. In addition, the inside of the middle plug 32 is not limited to the structure in which the above-described heat insulating material 16 is arranged, but can be a structure in which air (a gap) that becomes a heat insulating layer is provided.

[0112] In addition, an external thread portion 34 that is screwed with the internal thread portion 6 on the container body 2B side is provided on the outer peripheral surface of the peripheral wall portion 32b (middle plug 32). In the lid unit IB, by screwing of the internal thread portion 6 and the external thread portion 34, the middle plug 32 (lid body 30) is attached and detached with respect to the container body 2B.

[0113] In addition, the internal thread portion 6 and the external thread portion 34 are composed of double threads that are complementary to each other. In the case of using double threads, the lid body 30 can be attached and detached with respect to the container body 2B with a small number of rotation operations (about 180° in the present embodiment).

[0114] The waterproof packing 33 is composed of, for example, a ring-shaped elastic sealing member such as a silicone rubber or the like that has heat resistance. The waterproof packing 33 is attached and detached with respect to the middle plug 32 in a state of being fitted into a ring-shaped groove portion 35 provided on the outer peripheral portion of the middle plug 32.

[0115] On the other hand, the waterproof packing 33 can be removed from the middle plug 32 by elastically deforming (stretching) itself. Thus, the middle plug 32 and the waterproof packing 33 can be separately and individually cleaned, and the middle plug 32 and the waterproof packing 33 can be kept hygienic with respect to each other.

[0116] In addition, a plurality of (two in the present embodiment) elastic flange portions 33a that are arranged in the up-and-down direction are provided on the outer peripheral portion of the waterproof packing 33. The elastic flange portions 33a have a shape that protrudes from the outer peripheral surface of the waterproof packing 33 in the diameter-enlarging direction over the entire circumference.

[0117] When the middle plug 32 is fitted into the inside of the container body 2B, the waterproof packing 33 becomes a state in which the elastic flange portions 33a are in contact with the protruding portion 7 of the container body 2B while elastically deforming, and thus are in contact with the protruding portion 7 over the entire circumference. Thus, the inside of the container body 2B and the middle plug 32 can be sealed (waterproofed) by the waterproof packing 33.

[0118] However, in the lid unit 1B of the present embodiment, a pressure release portion 40 is provided at the outer peripheral portion of the center bolt 32, which releases the pressure inside the container main body 2B when it rises to a prescribed pressure.

[0119] The pressure release portion 40 has a recessed portion or a cutout portion (a recessed portion in the present embodiment) 40a that communicates with the inside of the container main body 2B via the groove portion 35. Specifically, the recessed portion 40a is provided so as to recess a portion of the side surface of the outer peripheral portion of the center bolt 32 on the upper side where the groove portion 35 is formed.

[0120] Furthermore, the number of recessed portions 40a provided can be one or a plurality. In the case where a plurality of recessed portions 40a are provided, it is preferable to arrange and provide them at equal intervals in the circumferential direction of the groove portion 35. In addition, if the width in the circumferential direction of the recessed portion 40a is too wide, it becomes a cause of leakage, and thus it is preferable to provide it within an angle range of 60° or less.

[0121] In the lid unit 1B of the present embodiment, in a state where the waterproof packing 33 is fitted in the groove portion 35, the waterproof packing 33 partitions between the groove portion 35 and the recessed portion 40a. In addition, the inside of the container main body 2B and the center bolt 32 become a state where they are sealed (waterproofed) by the waterproof packing 33.

[0122] When the pressure inside the container main body 2B rises to a prescribed pressure (for example, 200 kPa or more and 800 kPa or less) from this state, the waterproof packing 33 elastically deforms, and the groove portion 35 and the recessed portion 40a become a state where they communicate. Thereby, the pressure inside the container main body 2B is released to the outside from the recessed portion 40a.

[0123] Furthermore, in the case where a plurality of recessed portions 40a are provided, by respectively changing the size of the width in the circumferential direction, it is also possible to adjust the set value of the pressure at which the waterproof packing 33 elastically deforms.

[0124] On the other hand, after the pressure inside the container main body 2B is released, the waterproof packing 33 elastically returns, thereby partitioning between the groove portion 35 and the recessed portion 40a. Thereby, the inside of the container main body 2B and the center bolt 32 again become a state where they are sealed (waterproofed).

[0125] Therefore, in the container with lid 100B that is provided with the lid unit 1B of the present embodiment, as the pressure inside the container main body 2B rises, the fastening force that is generated by the screwing between the inner thread portion 6 on the container main body 2B side and the outer thread portion 34 on the center bolt 32 side increases, whereby the outer lid 31 does not become difficult to rotate in the bolt opening direction, and thus it is possible to easily remove the lid main body 30 (lid unit 1B) from the container main body 2B.

[0126] In addition, in the capped container 100B of the present embodiment, it is possible to prevent the cap body 30 (cap unit IB) from flying upward due to the pressure rising in the container body 2B when the cap body 30 (cap unit IB) is removed from the container body 2B.

[0127] As described above, in the capped container 100B of the present embodiment, it is possible to prevent the pressure in the container body 2B from rising, and to easily and safely uncap the cap body 30 (cap unit IB). In addition, it is possible to maintain the airtightness well using the waterproof packing 33, and to improve the operability when uncaping the cap body 30 (cap unit IB). Therefore, in the capped container 100B provided with such a cap unit IB, it is possible to achieve further improvement in the convenience of use.

[0128] Further, in the cap unit IB of the present embodiment, a structure in which the intermediate plug 32 is detachably attached to the container body 2B by screwing is adopted, but a structure in which the outer cap 31 is detachably attached to the container body 2B by screwing can also be adopted.

[0129] (Third Embodiment)

[0130] Next, as the third embodiment of the present application, for example, a capped container 100C provided with a cap unit IC as shown in FIG. 10 is described. Figures 7 to 12

[0131] Further, Figure 7 is a cross-sectional view showing the structure of the capped container 100C provided with the cap unit IC. Figure 8 is an exploded perspective view of the cap unit IC and the container body 2C as viewed from the lower side. Figure 9 is an exploded perspective view of the cap body 51 and the waterproof packing 55 provided in the cap unit IC as viewed from the lower side. Figure 10 is a side view showing the structure of the cap body 51. Figure 11 is an exploded perspective view showing the structure of the cap body 52 provided in the cap unit IC and the cap packing 60 as viewed from the lower side. Figure 12 is a side view showing the structure of the cap body 52.

[0132] In addition, in the following description, the same reference numerals are used for the same parts as the above-described cap unit IA and container body 2A, and the description thereof is omitted, and the same reference numerals are marked in the drawings.

[0133] As shown in FIG. 10, Figure 7 and Figure 8 the capped container 100C of the present embodiment is provided with the cap unit IC of the present embodiment, and the container body 2C to which the cap unit IC is detachably attached.

[0134] ​The lidded container 100C is a magic bottle (beverage container) that can keep hot beverages (contents) contained in the container body 2C warm through the container body 2C which has a vacuum insulation structure.

[0135] Specifically, the container body 2C has a shape that is longer than that of the container body 2A, but has a structure that is basically the same as that of the container body 2A.

[0136] The cover unit 1C of this embodiment includes: a cover body 51, which is installed on the neck portion 2c of the container body 2C and has a liquid passage hole 50 communicating with the inside of the container body 2C; and a cover body 52, which is detachably installed relative to the cover body 51 by screwing on and opens and closes the liquid passage hole 50.

[0137] like Figures 7 to 10 As shown, the cap body 51 has: an outer cylinder portion 53, which fits into the neck portion 2c of the container body 2C; an inner cylinder portion 54, which is inserted into the inner side of the container body 2C from the upper opening portion 2d; and a waterproof sealing member 55, which is located on the outer periphery of the inner cylinder portion 54, so that the inner side of the container body 2C and the inner cylinder portion are sealed.

[0138] The cover body 51 is constructed, for example, by integrally forming a cylindrical outer cylinder portion 53 and an inner cylinder portion 54 made of a heat-resistant resin such as polypropylene (PP). Alternatively, the cover body 51 may also have a structure in which the outer cylinder portion 53 and the inner cylinder portion 54 are integrally formed. Furthermore, for the outer cylinder portion 53, in addition to PP as described above, thermoplastic resins such as acrylonitrile butadiene styrene (ABS) can also be used.

[0139] The liquid passage 50 is provided to penetrate the inner side of the inner cylinder portion 54. The liquid passage 50 has: a tapered hole portion 50a that gradually narrows from the upper end of the inner cylinder portion 54 downwards; a first straight hole portion 50b that has the same diameter extending downwards from the lower end of the tapered hole portion 50a; a stepped portion 50c that is narrower than the first straight hole portion 50b at the lower end of the first straight hole portion 50b; and a second straight hole portion 50d that has the same diameter extending downwards from the stepped portion 50c.

[0140] An external threaded portion 56 is provided on the outer peripheral surface of the inner cylinder portion 54, which engages with the internal threaded portion 6 on the container body 2C side. In the cover unit 1C, the inner cylinder portion 54 (cover body 51) is detachably mounted relative to the container body 2C by engaging these internal threaded portions 6 with the external threaded portions 56.

[0141] The waterproof sealant 55 is made of annular elastic sealing components such as heat-resistant rubber or elastomers, for example. The waterproof sealant 55 is installed relative to the inner cylinder 54 in a state of fitting into an annular groove 57 provided on the outer periphery of the inner cylinder 54, and can be freely installed and removed from the inner cylinder 54.

[0142] On the other hand, the waterproof packing 55 is capable of being removed from the inner cylinder portion 54 by elastically deforming (stretching) itself. Thus, the inner cylinder portion 54 and the waterproof packing 55 can be separately and individually cleaned, and the inner cylinder portion 54 and the waterproof packing 55 can be kept hygienic.

[0143] Further, at least one or more (two in the present embodiment) elastic flange portions 55a are provided at the outer peripheral portion of the waterproof packing 55. The elastic flange portion 55a has a shape protruding from the outer peripheral surface of the waterproof packing 55 in the entire circumference of the diameter-increasing direction.

[0144] When the inner cylinder portion 54 is inserted into the inside of the container body 2C, the waterproof packing 55 becomes in a state where the elastic flange portion 55a elastically deforms while abutting against the protruding portion 7 of the container body 2C, and thus is in a state of being in close contact with the protruding portion 7 in the entire circumference. Thus, the waterproof packing 55 can seal (waterproof) the inside of the container body 2C and the inner cylinder portion 54.

[0145] As shown in Figs. 1 and 2, the lid body 51 has a substantially cylindrical shape, and is provided with a liquid passage hole 50, which is a through-hole penetrating the lid body 51 in the entire circumference, and a through-hole 51a, which is a through-hole penetrating the lid body 51 in the entire circumference, and is provided at the center of the lower surface of the lid body 51. Figure 7 、 Figure 8 、 Figure 11 and Figure 12 As shown in Figs. 1 and 2, the lid body 51 has a substantially cylindrical shape, and is provided with a liquid passage hole 50, which is a through-hole penetrating the lid body 51 in the entire circumference, and a through-hole 51a, which is a through-hole penetrating the lid body 51 in the entire circumference, and is provided at the center of the lower surface of the lid body 51.

[0146] The outer lid 58 is, for example, made of a heat-resistant resin such as polypropylene or Tritan (registered trademark), and has a peripheral wall portion 58a formed in a substantially cylindrical shape in accordance with the outer diameter of the outer cylinder portion 53, and an upper wall portion 58b which closes the upper portion of the peripheral wall portion 58a.

[0147] The center plug 59 is, for example, made of a heat-resistant resin such as polypropylene or Tritan (registered trademark), and has a substantially circular bottom wall portion 59a, and a peripheral wall portion 59b which stands in a substantially cylindrical shape from the periphery of the bottom wall portion 59a.

[0148] The center plug 59 is located at the inner side central portion of the outer lid 58, and the peripheral wall portion 59b is integrally installed at the central portion of the lower surface of the upper wall portion 58b by welding or the like. A heat insulating material 61 made of, for example, a foamed polyurethane resin or the like is arranged as a heat insulating layer at the inner side of the center plug 59. Further, as the heat insulating layer, air (void) can be used instead of the above-described heat insulating material 61.

[0149] An inner thread portion 62 is provided on the inner peripheral surface of the inner cylinder portion 54. The inner thread portion 62 is provided at a position of the inner cylinder portion 54 at which the second straight hole portion 50d is formed. On the other hand, an outer thread portion 63 that is screwed with the inner thread portion 62 is provided on the outer peripheral surface of the middle plug 59. In the cap unit 1C, by screwing of the inner thread portion 62 and the outer thread portion 63, the middle plug 59 (cap body 52) is detachably attached to the inner cylinder portion 54 (cap main body 51).

[0150] Further, the inner thread portion 62 and the outer thread portion 63 are constituted by double threads that are complementary to each other. In the case of using double threads, the cap body 52 can be attached to and detached from the cap main body 51 with a small number of rotation operations (about 180° in the present embodiment).

[0151] The cap packing 60 is constituted by, for example, a ring-shaped elastic sealing member of rubber, an elastomer, or the like that has heat resistance. The cap packing 60 is detachably attached to the middle plug 59 in a state of being fitted to a ring-shaped groove portion 64 provided on the outer peripheral portion of the middle plug 59.

[0152] On the other hand, the cap packing 60 is capable of being removed from the middle plug 59 by elastically deforming (stretching) itself. Thus, the middle plug 59 and the cap packing 60 can be separately and individually cleaned, and the middle plug 59 and the cap packing 60 can be kept hygienic.

[0153] Further, a plurality of elastic flange portions 60a are provided on the outer peripheral portion of the cap packing 60 in the up-and-down direction. The elastic flange portions 60a have a shape that protrudes from the outer peripheral surface of the cap packing 60 in the diameter-enlarging direction over the entire circumference.

[0154] When the middle plug 59 is fitted inside the inner cylinder portion 54 (cap main body 51), the cap packing 60 becomes in a state of being in elastic contact with the inner peripheral surface of the cap main body 51 with the elastic flange portions 60a elastically deformed, and thus is in elastic contact with the inner peripheral surface of the cap main body 51 over the entire circumference. Further, the elastic flange portions 60a preferably come into contact with the first straight hole portion 50b in the vicinity of the boundary between the tapered hole portion 50a and the first straight hole portion 50b. Thus, the inside of the cap main body 51 and the middle plug 59 can be sealed (waterproofed) by the cap packing 60.

[0155] However, in the cap unit 1C of the present embodiment, a pressure release portion 70 that releases the pressure inside the container main body 2C when the pressure inside the container main body 2C rises to a predetermined pressure is provided on the outer peripheral portion of at least one of the inner cylinder portion 54 and the middle plug 59 (both in the present embodiment).

[0156] The pressure release portion 70 has a recessed portion or cutout portion (recessed portion in the present embodiment) 70a that communicates with the inside of the container body 2C via the groove portion 57. Specifically, the recessed portion 70a is provided so as to recess a portion of the side surface of the upper side of the outer peripheral portion of the inner cylinder portion 54 in which the groove portion 57 is formed.

[0157] Further, the number of recessed portions 70a provided can be one or a plurality. In the case where a plurality of recessed portions 70a are provided, it is preferable to arrange and provide them at equal intervals in the circumferential direction of the groove portion 57. In addition, if the width in the circumferential direction of the recessed portion 70a is too wide, it becomes a cause of leakage, and thus it is preferable to provide it within an angle range of 60° or less.

[0158] In addition, the pressure release portion 70 has a recessed portion 70b that communicates with the inside of the container body 2C via the groove portion 64. Specifically, the recessed portion 70b is provided so as to recess a portion of the side surface of the upper side of the outer peripheral portion of the middle peg 59 in which the groove portion 64 is formed.

[0159] Further, the number of recessed portions 70b provided can be one or a plurality. In the case where a plurality of recessed portions 70b are provided, it is preferable to arrange and provide them at equal intervals in the circumferential direction of the groove portion 64. In addition, if the width in the circumferential direction of the recessed portion 70b is too wide, it becomes a cause of leakage, and thus it is preferable to provide it within an angle range of 60° or less.

[0160] In the cap unit 1C of the present embodiment, in a state where the waterproof packing 55 is fitted in the groove portion 57, the waterproof packing 55 partitions between the groove portion 57 and the recessed portion 70a. In addition, the inside of the container body 2C and the inner cylinder portion 54 become a state of being sealed (waterproofed) by the waterproof packing 55.

[0161] When the pressure in the container body 2C rises to a prescribed pressure (for example, 200 kPa or more and 800 kPa or less) from this state, the waterproof packing 55 elastically deforms, and the groove portion 57 and the recessed portion 70a become a state of communicating. Thereby, the pressure in the container body 2C is released to the outside from the recessed portion 70a.

[0162] Further, in the case where a plurality of recessed portions 70a are provided, by respectively changing the size of the width in the circumferential direction, it is also possible to adjust the set value of the pressure at which the waterproof packing 55 elastically deforms.

[0163] On the other hand, after the pressure in the container body 2C is released, the waterproof packing 55 elastically returns, and thereby partitions between the groove portion 57 and the recessed portion 70a. Thereby, the inside of the container body 2C and the inner cylinder portion 54 again become a state of being sealed (waterproofed).

[0164] Therefore, in the capped container 100C provided with the cap unit 1C of the present embodiment, as the pressure in the container body 2C rises, the tightening force generated by the screwing between the inner threaded portion 6 on the container body 2C side and the outer threaded portion 56 on the inner cylindrical portion 54 side increases, whereby the cap body 51 does not become difficult to rotate in the direction of opening the bolt, and thus the cap body 51 (cap unit 1C) can be easily removed from the container body 2C.

[0165] In addition, in the capped container 100C of the present embodiment, it is possible to avoid the cap body 51 (cap unit 1C) from flying upward due to the rising pressure in the container body 2C when the cap body 51 (cap unit 1C) is removed from the container body 2C.

[0166] In addition, in the cap unit 1C of the present embodiment, in a state where the cap gasket 60 is fitted in the groove portion 64, the cap gasket 60 partitions between the groove portion 64 and the recessed portion 70b. In addition, the inside of the inner cylindrical portion 54 and the middle bolt 59 become a state of being sealed (waterproofed) by the cap gasket 60.

[0167] When the pressure in the container body 2C rises to a prescribed pressure (for example, 200 kPa or more and 800 kPa or less) from this state, the cap gasket 60 elastically deforms, and the groove portion 64 and the recessed portion 70b become a state of being in communication. Thereby, the pressure in the container body 2C is released to the outside from the recessed portion 70b.

[0168] Further, in the case where a plurality of recessed portions 70b are provided, by respectively changing the size of the width in the circumferential direction, it is also possible to adjust the set value of the pressure at which the waterproof gasket 60 elastically deforms.

[0169] On the other hand, after the pressure in the container body 2C is released, the cap gasket 60 elastically returns, whereby the groove portion 64 and the recessed portion 70b are partitioned. Thereby, the inside of the inner cylindrical portion 54 and the middle bolt 59 again become a state of being sealed (waterproofed).

[0170] Therefore, in the capped container 100C provided with the cap unit 1C of the present embodiment, as the pressure in the container body 2C rises, the tightening force generated by the screwing between the inner threaded portion 62 on the inner cylindrical portion 54 side and the outer threaded portion 63 on the middle bolt 59 side increases, whereby the outer cap 58 does not become difficult to rotate in the direction of opening the bolt, and thus the cap body 52 can be easily removed from the cap body 51.

[0171] In addition, in the capped container 100C of the present embodiment, it is possible to avoid the cap body 52 from flying upward due to the rising pressure in the container body 2C when the cap body 52 is removed from the cap body 51.

[0172] As above, in the capped container 100C of the present embodiment, the pressure rise in the container main body 2C can be prevented, and the lid main body 51 and the lid 52 can be easily and safely unsealed. In addition, the airtightness can be favorably maintained using the waterproof packing 55 and the lid packing 60, and the operability when unsealing the lid main body 51 and the lid 52 is improved. Thus, in the capped container 100C provided with such a lid unit 1C, further improvement in the convenience of use can be achieved.

[0173] Further, in the lid unit 1C of the present embodiment, a structure in which the inner cylindrical portion 54 is detachably attached to the above-described container main body 2C by screwing is employed, but a structure in which the outer cylindrical portion 53 is detachably attached to the container main body 2C by screwing can also be employed.

[0174] Further, the present application is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present application.

[0175] In the above-described embodiments, the capped containers 100A, 100B, 100C in which the above-described container main bodies 2A, 2B, 2C having the vacuum heat-insulating structure maintain the heat-retaining function are exemplified, but the present application can also be applied to capped containers provided with container main bodies that do not have a vacuum heat-insulating structure.

Claims

1. A cover unit, which is installed relative to the upper opening of a container body, characterized in that, Possessing: an outer lid covering an upper opening portion of the container body; an inner lid embedded from an upper opening portion of the container body to an inner side of the container body; and a waterproof packing located at an outer peripheral portion of the inner lid to seal between the inner side of the container body and the inner lid, the waterproof packing is composed of a ring-shaped elastic sealing member abutting against a protruding portion protruding from the inner side of the container body throughout the entire circumference, and is installed to the inner lid in a state of fitting into a ring-shaped groove portion provided at the outer peripheral portion of the inner lid, a pressure release portion is provided at the outer peripheral portion of the inner lid, and releases the pressure in the container body when the pressure in the container body rises to a predetermined pressure, the pressure release portion has a recess or a notch portion communicating with the inner side of the container body via the groove portion provided at the outer peripheral portion of the inner lid, in a state where the elastic sealing member is fitted into the groove portion, the elastic sealing member separates between the groove portion and the recess or the notch portion, when the pressure in the container body rises to a predetermined pressure, the elastic sealing member elastically deforms, and the groove portion and the recess or the notch portion become in communication, whereby the pressure in the container body is released from the groove portion and the recess or the notch portion to the outside.

2. A lid unit which is a lid unit installed with respect to a container main body which is opened at an upper portion, characterized by comprising: Possessing: an outer lid covering an outer side of the container body; a center plug located at a central portion of an inner side of the outer lid, and embedded from an upper opening portion of the container body to an inner side of the container body; and a waterproof packing located at an outer peripheral portion of the center plug to seal between the inner side of the container body and the center plug, the waterproof packing is composed of a ring-shaped elastic sealing member abutting against a protruding portion protruding from the inner side of the container body throughout the entire circumference, and is installed to the center plug in a state of fitting into a ring-shaped groove portion provided at the outer peripheral portion of the center plug, a pressure release portion is provided at the outer peripheral portion of the center plug, and releases the pressure in the container body when the pressure in the container body rises to a predetermined pressure, the pressure release portion has a recess or a notch portion communicating with the inner side of the container body via the groove portion provided at the outer peripheral portion of the center plug, in a state where the elastic sealing member is fitted into the groove portion, the elastic sealing member separates between the groove portion and the recess or the notch portion, when the pressure in the container body rises to a predetermined pressure, the elastic sealing member elastically deforms, and the groove portion and the recess or the notch portion become in communication, whereby the pressure in the container body is released from the groove portion and the recess or the notch portion to the outside.

3. A lid unit which is a lid unit installed with respect to a container main body which is opened at an upper portion, characterized by comprising: Possessing: a lid body installed to a neck portion of the container body, and provided with a liquid passage hole communicating with an inner side of the container body; and a lid body detachably installed with respect to the lid body by screwing, and opening and closing the liquid passage hole, the lid body has: an inner cylinder portion embedded from an upper opening portion of the container body to an inner side of the container body; and A waterproof packing member is provided at an outer peripheral portion of the inner cylinder portion to seal between an inner side of the container main body and the inner cylinder portion, The waterproof packing member is composed of a ring-shaped elastic sealing member that abuts against a protruding portion protruding from the inner side of the container main body in its entirety in the circumferential direction, and is attached to the inner cylinder portion in a state of being fitted into a ring-shaped groove portion provided at the outer peripheral portion of the inner cylinder portion, The cover body has: an outer cover that covers an outer side of the cover main body; a center plug that is provided at a central portion of an inner side of the outer cover to close the liquid passage hole in a state of being fitted into the inner side of the cover main body; and a cover packing member that is provided at an outer peripheral portion of the center plug to seal between an inner side of the cover main body and the center plug, The cover packing member is composed of a ring-shaped elastic sealing member that abuts against an inner peripheral surface of the cover main body in its entirety in the circumferential direction, and is attached to the center plug in a state of being fitted into a ring-shaped groove portion provided at the outer peripheral portion of the center plug, A pressure release portion is provided at an outer peripheral portion of at least one of the inner cylinder portion and the center plug, and releases the pressure in the container main body when the pressure in the container main body rises to a predetermined pressure, The pressure release portion has a recessed portion or a cutout portion that communicates with the inner side of the container main body via a groove portion provided at the outer peripheral portion of the inner cylinder portion, In a state where the elastic sealing member is fitted into the groove portion, the elastic sealing member separates the groove portion from the recessed portion or the cutout portion, When the pressure in the container main body rises to a predetermined pressure, the elastic sealing member elastically deforms, and the groove portion and the recessed portion or the cutout portion become in communication, whereby the pressure in the container main body is released to the outside from the groove portion and the recessed portion or the cutout portion.

4. The cover unit according to any one of claims 1 to 3, characterized in that the recessed portion or the cutout portion is provided so as to recess or cut at least a portion of a side surface that forms an upper side of the groove portion.

5. The cover unit according to any one of claims 1 to 3, characterized in that the recessed portion or the cutout portion is arranged at equal intervals in the circumferential direction of the groove portion.

6. A container with a lid, characterized in that comprises: the cover unit according to any one of claims 1 to 5; and a container main body on which the cover unit is mounted.

7. The covered container according to claim 6, characterized in that the container main body has a vacuum heat-insulating structure.

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