TW202023917A - Cap - Google Patents

Abstract

A cap (1) comprises: a cap body (11) that has a disc-shaped top plate part (21) and a cylindrical skirt part (22) provided on the peripheral edge part of the top plate part (21); a sealing member (12) provided inside the cap body (11) facing the top plate part (21) separately from the cap body (11), the outer diameter of the sealing member (12) being formed to have a smaller diameter than the inner diameter of the skirt part (22); a bead part (32) provided to the skirt part (22), the bead part (32) limiting and supporting the movement of the sealing member (12) in the direction separating from the top plate part (21), the bead part (32) projecting radially inward in the radial direction of the skirt part (22); and a slit part (33) provided to the bead part (32).

Description

cover

The present invention relates to a lid for closing a tank container.

Conventionally, a cap that seals the mouth of a tank container uses a structure in which a sealing member made of a resin material that is in close contact with the mouth is provided on the inner surface of the cap body. In addition, Japanese Patent Application Laid-Open No. 2017-178421 discloses that for such a cover, in order to reduce the opening torque when the cover is opened, the cover body and the sealing member are formed as a non-adhesive technology. In the case where the sealing member is formed as non-adhesive in this way, a locking protrusion protruding inward is formed on the edge of the cover body to lock the sealing member so that the sealing member does not fall off.

In addition, it is known that when a lid is used for a positive pressure tank in which the inner pressure of the tank is a positive pressure, a ventilation gap is formed in the lid in order to release the internal pressure when opening. [Prior Technical Literature] [Patent Literature]

Patent Document 1 Japanese Patent Application Publication No. 2017-178421

[The problem to be solved by the invention]

However, when the vent gap is provided in the cover, there is a concern that when the vent gap is opened by the cut end of the vent gap, discomfort or the like may be generated on the hand, and the tactile sensation during opening may be reduced. In addition, there is a concern that the contents and the gas in the tank will be scattered from the vent gap when it is opened, and a technology to prevent the contents from scattering through the vent gap is required.

Therefore, the object of the present invention is to provide a cover that can improve the tactility when opening and suppress the scattering of the contents. [Technical means to solve the problem]

As one aspect of the present invention, the cover includes: a cover body, a top plate portion having a disc shape, and a cylindrical edge portion provided on the peripheral edge of the top plate portion; the sealing member is an individual different from the cover body, and The top plate portion is relatively disposed in the cover body, and the outer diameter is formed to be smaller than the inner diameter of the edge portion; the rounded edge portion is provided on the edge portion to restrict the movement of the sealing member in the direction away from the top plate portion It is supported and protrudes annularly toward the radially inner side of the edge portion; and the slit portion is provided at the round edge portion. [Invention Effect]

According to the present invention, it is possible to provide a cover that can improve the tactile feel at the time of opening and suppress scattering of contents.

Hereinafter, the cap 1 according to an embodiment of the present invention will be described using FIGS. 1 to 6. Fig. 1 is a side view showing the structure of the cover 1 according to the first embodiment of the present invention in a partial section. FIG. 2 is a side view showing the structure of the cover 1. Fig. 3 is a cross-sectional view showing the structure of the cover 1 partially omitted. FIG. 4 is a cross-sectional view showing the structure of an important part of the lid 1 and the movement of the gas in the tank container 100 when the lid 1 is away from the mouth portion 110 of the tank container 100. Fig. 5 is a cross-sectional view showing the structure of the cover body 11 used in the cover 1 in the cross section taken along the line V-V in Fig. 2. Fig. 6 is a cross-sectional view showing the structure of the rounded edge portion 32 and the slit portion 33 of the cover main body 11 in the VI-VI line cross-section in Fig. 2 and partially omitted other structures.

As shown in FIG. 1, the lid 1 is attached to the mouth 110 of the can container 100, and is sealed and fixed in a state of being sheathed on the mouth 110 of the can container 100, thereby sealing the can container 100.

Here, the can container 100 is a so-called bottle-type container that stores beverages and the like. For example, the can container 100 is made of a metal material such as an aluminum alloy with a resin film layered on two areas and a surface-treated steel plate. The tank container 100 is formed in a cylindrical shape having a different outer diameter with one end reduced in diameter. The can container 100 has a mouth 110 for discharging the stored beverage at one of its ends. The mouth portion 110 has a lower jaw portion 111, a male screw portion 112, and a curl portion 113 on its outer peripheral surface from the bottom surface side of the can container 100 toward the end.

The lower jaw 111 is formed by an annular protrusion. The crimped portion 113 is formed to have a smaller diameter than the male screw portion 112. In addition, the outer diameter of the crimped portion 113 is smaller than the inner diameter of the cap 1. The curled portion 113 is formed by folding the end of the mouth portion 110 more than once. The curling portion 113 is an opening configured to discharge the beverage stored in the can container 100.

As shown in FIGS. 1 to 4, the cover 1 includes a cover body 11 and a sealing member 12 provided in the cover body 11 in different individuals.

The cover body 11 is formed of a material formed by forming a resin film layer on a metal material such as aluminum alloy. The cover body 11 is formed by forming a thin flat plate-shaped material into a cup shape by performing drawing molding, knurling molding, and roll molding.

The cover body 11 includes a disk-shaped top plate portion 21 and a cylindrical edge portion 22 integrally provided on the peripheral edge of the top plate portion 21. The cover body 11 has a top plate portion 21 and an edge portion 22 in an annular shape, and is formed by connecting curved corner portions 23 integrally.

The top plate part 21 is a disc shape, and the main surface is comprised as a plane. The edge portion 22 has one end connected to the top plate portion 21 via a corner portion 23, and the other end is open. The edge portion 22 is from the end of the top plate portion 21 to the end of the opening, and includes a plurality of recesses 31, a rounded edge portion 32, a plurality of slit portions 33, a female screw portion 34, and a tamper-proof tape portion 35.

As shown in Figures 1 to 6, the plurality of recesses 31, the rounded edge portion 32, the plurality of slits 33, the female screw portion 34, and the tamper-proof belt portion 35 are formed by the top plate portion 21; The concave portion 31, the rounded edge portion 32, the plurality of gaps 33, the female screw portion 34, and the cylindrical edge portion 22 of the tamper-proof belt portion 35; and the cup-shaped molded product formed by the corner portion 23 is knurled And formed by processing such as roll forming.

As shown in FIG. 1, FIG. 2, and FIG. 5, the plurality of recesses 31 are provided between the top plate portion 21 and the circular edge portion 32 of the edge portion 22. The plural recesses 31 are, for example, arranged in the circumferential direction of the edge portion 22 at equal intervals. The plural recesses 31 are formed such that the dimension in the axial direction of the cover 1 is longer than the dimension in the circumferential direction of the cover 1.

As shown in Fig. 1, Fig. 2, Fig. 4, and Fig. 6, the circular edge portion 32 is formed in a ring shape. The circular edge portion 32 is located closer to the front end side of the edge portion 22 than the plurality of recesses 31 and is configured to protrude annularly inward in the radial direction via the edge portion 22. The inner diameter of the circular edge portion 32 is smaller than the outer diameter of the sealing member 12. Therefore, the rounded edge portion 32 is a locking portion configured to restrict movement in a direction away from the top plate portion 21 of the sealing member 12 arranged on the top plate portion 21. Specifically, as shown in Figures 1, 3, and 4, the circular edge portion 32 is set to have an inner diameter that becomes the smallest diameter, and is smaller than the outer diameter of the sealing member 12, and from this The location up to the edge portion 22 is inclined with respect to the axis of the edge portion 22.

As shown in FIG. 1, FIG. 2, FIG. 4, and FIG. 6, the plurality of slit portions 33 are provided in the circular edge portion 32. The plurality of slit portions 33 are arranged at equal intervals along the circumferential direction of the circular edge portion 32. For example, the slit part 33 is provided in the round edge part 32 at 8 locations at equal intervals in the circumferential direction. The slit portion 33 is formed by a partial cut provided in the circular edge portion 32. The gap portion 33 releases the internal pressure of the sealed can container 100 when the lid 1 is removed from the can container 100 when it is opened.

As shown in FIG. 1, FIG. 3, and FIG. 4, the slit portion 33 is provided at a location closer to the front end side of the edge portion 22 than a location that becomes the innermost peripheral portion in the radial direction of the circular edge portion 32. In other words, the slit portion 33 is provided closer to the front end side of the edge portion 22 than the portion where the inner diameter of the round edge portion 32 becomes the smallest diameter. The slit portion 33 is formed by a notch extending in the circumferential direction provided in a part of the circular edge portion 32. Therefore, as shown in FIG. 1, FIG. 3, and FIG. 4, the slit portion 33 has a first end portion 33a on the top plate portion 21 side and a second end portion 33b on the front end side of the edge portion 22.

The first end 33 a and the second end 33 b of the slit portion 33 are formed by a part of the rounded edge portion 32. The first end portion 33 a is radially inner side, and extends from the top plate portion 21 side toward the front end side of the edge portion 22. In other words, as shown in FIG. 4, in a state where the lid 1 is fitted on the mouth 110 of the tank container 100, when the tank container 100 is placed below and the lid 1 is placed above, the first end 33a is the lid 1. Inside and extend downward.

In addition, for example, as shown in FIG. 4, the front end of the first end 33a is bent in the axial direction of the cap 1, and extends toward the front end of the cap 1 in the axial direction of the cap 1. Here, the front end of the first end 33a extends in the axial direction toward the front end of the cover 1, and the extended length of the first end 33a does not need to have a predetermined length. In order to make the front end of the first end 33a face in the axial direction, It is only necessary that the front end face the axial direction by the partial bending of the first end 33a.

The second end portion 33b is radially inside and extends from the front end side of the edge portion 22 toward the top plate portion 21 side. In other words, as shown in FIG. 4, when the lid 1 is fitted over the mouth 110 of the tank container 100, the second end 33b is the lid 1 when the tank container 100 is placed below and the lid 1 is placed above. Inside, and extend upwards.

In such a slit portion 33, as shown in FIG. 4, the front end of the first end portion 33a is located on the inner side in the radial direction of the edge portion 22 than the front end of the second end portion 33b. In other words, the slit portion 33 has the front end of the first end portion 33a located on the center side of the edge portion 22 than the front end of the second end portion 33b.

The female screw portion 34 is configured to be screwable to the male screw portion 112 of the tank container 100. The female screw part 34 is formed together with the can container 100. That is, the female screw portion 34 has not been molded before the cap 1 is mounted on the tank container 100, and is molded when it is integrated with the tank container 100.

As shown in FIG. 1 and FIG. 2, the tamper-proof band 35 is in the direction of the lid 1 away from the can container 100 and in the axial direction of the lid 1, and engages with the lower jaw portion 111 of the can container 100. In addition, the tamper-resistant tape portion 35 has a broken portion 35a that breaks when the cover 1 is opened to break away from the edge portion 22. That is, the tamper-proof tape portion 35 is formed by leaving the broken portion 35a on the end side of the edge portion 22 to form a gap. Like the female screw portion 34, when integrally combined with the tank container 100, it is provided The shape is the shape of the lower jaw 111 of the tank container 100 and is engaged with the lower jaw 111.

As shown in FIG. 3, the sealing member 12 is configured as a separate body from the cover body 11. That is, the sealing member 12 is arranged opposite to the top plate portion 21 and the edge portion 22, and is not adhered to the cover 1. Specifically, as shown in FIG. 1, FIG. 3, and FIG. 4, the sealing member 12 is configured in a disc shape and has a rounded edge portion 32 whose diameter is set to be larger than that of the edge portion 22 provided on the cover body 11. The inner diameter of the larger outer diameter. In addition, the sealing member 12 is set to have the same or slightly smaller outer diameter as the diameter of the circle contacting the inner surface of the plurality of recesses 31 provided on the edge portion 22 of the cover body 11.

The sealing member 12 is integrally provided with the rounded edge portion 32 protruding radially from the inner peripheral surface of the edge portion 22 and is engaged in the axial direction of the cover body 11 to limit the detachment from the cover body 11 in the axial direction.于盖体11。 In the cover body 11. In addition, the sealing member 12 abuts against the inner surface of the plurality of recesses 31 of the edge portion 22, and is engaged in the radial direction of the cover body 11, so that the center is located in a predetermined range on the axis of the cover body 11. Way to center.

The sealing member 12 includes a disk-shaped sliding layer 41 and a disk-shaped sealing layer 42 layered on the sliding layer 41. The sealing member 12 is formed by integrally molding the sliding layer 41 and the sealing layer 42 with different resin materials. The sealing member 12 includes, for example, a flat plate portion 12a having the same thickness and a curved surface portion 12b formed of a curved surface on the outer peripheral edge on the top plate portion 21 side. In other words, the sealing member 12 is formed in a disc shape, and the ridge portion on the top plate portion 21 side is configured with a curved surface with a predetermined curvature. In addition, the sealing member 12 is configured such that the thickness of the curved portion 12b on the outer periphery side is thinner than that of the flat portion 12a, and the curved portion 12b gradually becomes thinner from the center side toward the outer periphery. The tip of the curved portion 12b, that is, the outer periphery The structure is thinnest than other parts. The flat plate portion 12a is a sealed portion configured to abut a part on the side of the curved portion 12b with the mouth portion 110 of the tank container 100. The flat plate portion 12a is configured such that, for example, the sealing portion is thicker than other parts.

The sliding layer 41 is made of a resin material having a relatively higher hardness (harder) than the sealing layer 42. In addition, the sliding layer 41 is formed of the resin film layer of the cover body 11 and a resin material that does not have adhesiveness and adhesion. That is, the sliding layer 41 is not adhered to the top plate part 21 and slides the top plate part 21 in a state in which it is in contact with the top plate part 21.

Examples of resin materials used for the sliding layer 41 include olefin resins such as polypropylene resins and polyethylene resins, polyester resins such as polyethylene phthalate, styrene resins, and acrylic resins. In this embodiment, the sliding layer 41 is made of, for example, polypropylene resin. In addition, to the resin material used for the sliding layer 41, pigments, lubricants, softeners, etc. may be added as appropriate.

The sliding layer 41 is opposite to the top plate portion 21 of the cover body 11 and is provided on an individual different from the cover body 11. The sliding layer 41 is configured to be slidable with the top plate portion 21 of the cover body 11 by the resin material used. The sliding layer 41 is configured in a disc shape. The outer diameter of the sliding layer 41 is smaller than the inner diameter of the edge portion 22 and smaller than the inscribed circle of the plurality of recesses 31, and is configured to be larger than the smallest inner diameter that becomes the circular edge portion 32.

The sliding layer 41 includes: a first flat plate portion 41a having the same thickness; a first curved portion 41b formed by a curved surface on the outer peripheral edge of the top plate portion 21; and a protrusion 41c provided on the first curved portion The sealing layer 42 side of 41b. The first flat plate portion 41 a is configured to have the same thickness from the center of the sliding layer 41 to the outer peripheral side than the portion facing the curled portion 113 of the mouth portion 110.

The first curved portion 41b is configured so that the thickness of the portion from the outer peripheral side to the outer peripheral edge than the portion facing the curled portion 113 of the mouth 110 is gradually reduced toward the outer peripheral edge. The protrusion 41c is formed in an annular protrusion shape that is inclined with respect to the axial direction of the sliding layer 41 and the surface direction of the top plate portion 21 and is curved or inclined toward the end of the opening of the edge portion 22. The thickness of the protrusion 41c gradually decreases from the first curved portion 41b toward the tip.

The sealing layer 42 is made of a resin material having a relatively lower hardness (softer) than the sliding layer 41. The resin materials used for the sealing layer 42 include olefin resins, polyester resins, styrene resins, and acrylic resins. More suitable ones include a mixed material of styrene elastomer and polypropylene resin. , Mixed materials of low-density polyethylene and styrene-based elastomers, and polyester-based elastomers. In this embodiment, the sealing layer 42 is made of, for example, a mixed material of a styrene-based elastomer and a polypropylene resin. In addition, pigments, lubricants, softeners, etc. may be appropriately added to the resin material used for the sealing layer 42.

The sealing layer 42 is integrally provided on the main surface of the sliding layer 41 on the side opposite to the mouth 110. The sealing layer 42 is configured in a disc shape. The outer diameter of the sealing layer 42 is configured to be larger than the outer diameter of the curled portion 113 of the mouth 110 and is configured to be substantially the same as the outer diameter of the sliding layer 41.

The sealing layer 42 includes: a second flat portion 42a, which is configured so that the thickness of the portion facing the mouth portion 110 is thicker than the others; and the second curved portion 42b is configured with a curved surface on the outer peripheral edge of the top plate portion 21 ; And the ring-shaped recess 42c is provided on the main surface on the side opposite to the sliding layer 41 side of the second curved surface portion 42b. The second flat portion 42a is configured to have a flat main surface facing the curl portion 113. For example, the second flat plate portion 42 a is configured to have the same diameter as the first flat plate portion 41 a of the sliding layer 41. The second flat plate portion 42a and the first flat plate portion 41a constitute the flat plate portion 12a of the sealing member 12 together.

The second curved portion 42b has, for example, a principal surface that is the same plane as the principal surface of the curled portion 113 facing the second flat portion 42a. The second curved portion 42b is configured to have a thickness from the outer peripheral side to the outer peripheral edge than the portion facing the curled portion 113 of the mouth portion 110, and the thickness gradually decreases toward the outer peripheral edge. The second curved portion 42b is laminated on the first curved portion 41b and the protrusion 41c. The second curved portion 42b constitutes the curved portion 12b of the sealing member 12 together with the first curved portion 41b and the protruding portion 41c.

The recess 42c is, for example, an annular recess having a semicircular cross section. Such a sealing member 12 is configured with the cover 1 with the top plate part 21 facing upward, and when the sealing member 12 falls below the top plate part 21, it is locked by abutting against the round edge part 32. The downward movement of the sealing member 12 in the direction of gravity is restricted. In addition, when the lid 1 is removed from the can container 100, the sealing member 12 is supported by the rounded edge portion 32 to separate from the mouth portion 110 and move together with the lid body 11.

The manufacturing method of the cap 1 comprised in this way is demonstrated briefly below. First, for example, the lid body 11 on the cup is molded from a metal plate material. Next, the cover main body 11 is placed on the lower mold with the top plate portion 21 positioned on the lower side in the gravity direction. Next, the molten or softened resin material for the sliding layer 41 is supplied onto the top plate portion 21, and the supplied resin material is compressed and molded by the upper mold, and the sliding layer 41 is molded. Next, the melted or softened resin material for the sealing layer 42 is supplied on the sliding layer 41, the resin material supplied in the upper mold is compression molded, and the sealing layer 42 is molded on the sliding layer 41. After that, the recessed portion 31, the rounded edge portion 32, the slit portion 33, the tamper-proof tape portion 35 and the like are molded on the edge portion 22 of the cover body 11. For example, the rounded edge portion 32 is formed by pressing a molding tool with a curved tip on the outer surface of the edge portion 22. In addition, the slit portion 33 is formed by arranging a molding tool having a blade point on the outer and inner sides of the edge portion 22, and sandwiching and cutting the molded rounded edge portion 32 from the outer and inner sides. The cover 1 is manufactured through such steps.

In addition, when the manufactured lid 1 is installed in the mouth portion 110 of the tank container 100, the top plate portion 21 of the lid 1 is in an upward posture. At this time, the sealing member 12 is positioned at the center portion of the lid body 11 by abutting against the inner surface of the plurality of recesses 31. Moreover, when the sealing member 12 is lowered only by a fixed distance, it is supported by the rounded edge portion 32, and movement in the lowering direction is restricted. In this state, when the cap 1 is put on the mouth 110, a predetermined part of the sealing layer 42 of the sealing member 12 faces the mouth 110. In this state, the edge portion 22 is roll-molded while the corner portion 23 of the lid body 11 is drawn and molded, and the lid 1 is sealed and fixed to the mouth portion 110 of the can container 100.

According to the cap 1 constructed in this way, the edge portion 22 is provided with a rounded edge portion 32 for restricting movement in the axial direction of the cap 1 of the sealing member 12, and the rounded edge portion 32 is provided for releasing the internal pressure of the can container 100. The structure of the slit 33. With this configuration, since the slit portion 33 is provided in the circular edge portion 32 that is annularly recessed from the edge portion 22 inward, the slit portion 33 is located on the radially inner side of the outer peripheral surface of the edge portion 22.

Therefore, when the operation cover 1 is opened, there is no case where the slit 33 touches the finger, and there is no discomfort caused by the contact with the slit 33. Therefore, even if the cover 1 is provided with the slit 33, the tactile feeling when opened can be improved.

In addition, since the distance from the gap portion 33 to the outer peripheral surface of the edge portion 22 can be ensured, when the internal pressure of the can container 100 is released, the contents and the gas in the can container 100 can be prevented from scattering together.

In addition, the slit portion 33 is arranged at a location where the inner diameter of the rounded edge portion 32 is the smallest, and closer to the front end side of the edge portion 22, that is, the lower side of the posture installed in the tank container 100, so the edge portion 22 is located It is lower than the gap created by the separation of the sealing member 12 and the mouth 110 at the time of unsealing. Therefore, the moving distance of the gas and the contents becomes longer, and it moves downward from the inside of the tank container 100 through the gap between the sealing member 12 and the mouth 110, and becomes a flow moving from the gap 33 into the atmosphere. Therefore, since it is possible to prevent the content from moving to the slit 33 as much as possible, the scattering of the content from the slit 33 can be further suppressed.

In addition, the slit portion 33 is such that the front end of the first end portion 33a is located on the inner side in the radial direction of the edge portion 22 than the front end of the second end portion 33b. Therefore, as indicated by the arrow in FIG. 4, the gas and the contents that move downward through the gap between the sealing member 12 and the mouth 110 further flow from the tip of the first end 33a and the tip of the second end 33b toward Move diagonally upward. As a result, the movement of the content is blocked by the first end 33a of the slit portion 33, and it is possible to further suppress the scattering of the content from the slit portion 33.

In addition, by forming the end of the first end 33a into a structure that extends downward, as shown by the arrow in Figure 4, due to the movement of the gas and the content, the first end 33a moves from below Since the movement is an upward movement, it is possible to further suppress the movement of the content from the slit 33.

In other words, with the structure in which the front end of the first end 33a is located on the inner side in the radial direction of the edge portion 22 than the front end of the second end 33b, and the structure in which the front end of the first end 33a extends downward, The tip of one end 33a has a function of shielding the liquid, which is the content that moves along with the gas. Thereby, the slit portion 33 exerts an effect of suppressing scattering of the content.

In addition, the cover 1 has a structure in which a plurality of recessed portions 31 are provided on the side of the top plate portion 21 rather than the rounded edge portion 32 of the edge portion 22, and the centering of the sealing member 12 can be performed by the inner surface of the recessed portion 31. In addition, the cover 1 improves the grip of the cover 1 at the time of opening due to the plurality of recesses 31, and can still obtain the effect of preventing the shrinkage of the upper part of the cover 1 due to the molding of the rounded portion during manufacturing.

As described above, according to the cover 1 according to one embodiment of the present invention, the structure in which the slit portion 33 is provided at the round edge portion 32 can improve the tactile feeling at the time of opening and suppress scattering of the contents.

In addition, this invention is not limited to the said embodiment. For example, the slit portion 33 is not limited to the above-mentioned structure. In the above-mentioned example, the slit portion 33 may only be provided in a structure in which the circular edge portion 32 is annularly recessed from the edge portion 22 inward. The slit portion 33 having this structure can also improve the tactile feel of the lid 1 when it is opened and suppress scattering of the contents. Similarly, the slit portion 33 may have a structure in which the front end of the first end portion 33 a and the front end of the second end portion 33 b are at the same position in the radial direction of the edge portion 22, or may be located outside in the radial direction of the edge portion 22. In addition, the slit portion 33 may have a shape in which the tip of the first end portion 33a and other parts of the first end portion 33a face the same direction. However, in consideration of suppressing the scattering of the contents, the structure of the slit portion 33 is preferably closer to the front end side of the edge portion 22 than the portion where the inner diameter of the round edge portion 32 becomes the smallest, and the front end of the first end portion 33a faces the axis. In addition, the front end of the first end 33a is arranged radially inwardly than the front end of the second end 33b.

In addition, the present invention is not limited to the above-mentioned embodiments, and various changes can be made in the implementation stage without departing from the spirit thereof. In addition, each embodiment can also be implemented in appropriate combination, and the effect of the combination in the case can be obtained. In addition, various inventions are included in the above-mentioned embodiment, and various inventions can be extracted by a combination selected from the disclosed plural structural requirements. For example, even if several structural elements are deleted from all the structural elements shown in the embodiment, the problem can still be solved. If an effect is obtained, the structure in which these structural elements are deleted can be extracted as an invention.

1: cover 11: Cover body 12: Sealing member 12a: Flat part 12b: Curved part 21: Top plate 22: Edge 23: corner 31: recess 32: Round edge 33: Gap 33a: first end 33b: 2nd end 34: Female screw part 35: Tamper-proof belt 35a: Fracture 41: sliding layer 41a: The first plate part 41b: The first curved surface 41c: protrusion 42: Sealing layer 42a: The second flat part 42b: The second curved surface 42c: recessed 100: tank container 110: mouth 111: Lower jaw 112: Male screw part 113: Curl

[Figure 1] A side view showing the structure of the cap according to the first embodiment of the present invention in partial cross-section. [Figure 2] A side view showing the structure of the cover. [Figure 3] is a cross-sectional view showing the structure of the cover partially omitted. [Figure 4] is a cross-sectional view showing the structure of an important part of the cover. [Figure 5] is a cross-sectional view showing the structure of the lid body of the lid. [Figure 6] is a cross-sectional view showing the structure of the lid body.

1: cover

11: Cover body

12: Sealing member

12b: Curved part

21: Top plate

22: Edge

23: corner

31: recess

32: Round edge

33: Gap

33a: first end

33b: 2nd end

34: Female screw part

35: Tamper-proof belt

35a: Fracture

41: sliding layer

41a: The first plate part

41b: The first curved surface

41c: protrusion

42: Sealing layer

42a: The second flat part

42b: The second curved surface

42c: recessed

100: tank container

110: mouth

111: Lower jaw

112: Male screw part

113: Curl

Claims (5)

A cover comprising: a cover body having a disk-shaped top plate portion and a cylindrical edge portion provided on the peripheral edge portion of the top plate portion; The sealing member is a different individual from the cover body, and is disposed in the cover body opposite to the top plate portion, and the outer diameter is formed to be smaller than the inner diameter of the edge portion; The rounded edge portion is provided on the edge portion, restricts movement of the sealing member in the direction away from the top plate portion and supports it, and protrudes annularly toward the radially inner side of the edge portion; and The slit is provided at the rounded edge. The cover described in item 1 of the scope of patent application, wherein: The slit portion is formed closer to the front end side of the edge portion than a portion having the smallest inner diameter of the round edge portion. The cover described in item 1 of the scope of patent application, wherein: The slit portion has a first end portion on the side of the top plate portion and a second end portion on the front end side of the edge portion, The first end portion is located on the radially inner side of the edge portion than the second end portion. The cover described in item 3 of the scope of patent application, wherein: The tip of the first end portion extends in the axial direction of the edge portion. The cover described in item 1 of the scope of patent application, wherein: It is provided with the recessed part which is provided in the said edge part on the side of the said top plate part rather than the said round edge part, and is provided in plural in the circumferential direction.

Images