Composite lid

Abstract

To provide a new composite lid capable of sufficiently and surely sealing a mouth part of an article even though the lid can be easily attached / detached to / from the mouth part of the article without requiring excessive force, and preventing the lid from flying vigorously when the lid is detached from the mouth part even when pressure in the article is increased.SOLUTION: A through hole 12 penetrating in the vertical direction is formed in a closing wall 8 of a lid body 4, and a closing means 50 is disposed on a lower surface of a top surface wall 48 of an outer lid 6. When the lid main body 4 is moved upward from the lowered position with respect to the outer lid 6, the outer peripheral surface of the portion of the supporting wall 10 of the lid main body 4 where the engaging protrusion 42 is formed approaches and faces the sliding portion 56 on the inner peripheral surface of the supported wall 54 of the outer lid 6, and then the closing means 50 of the outer lid 6 closes the through hole 12 of the lid main body 4.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a composite lid, and more particularly to a composite lid in which a lid body is movable vertically relative to an outer lid that houses the lid body inside. [Background technology]

[0002] Patent Document 1 listed below shows an example of a composite lid comprising a lid main body and an outer lid. The lid main body comprises a closing wall and a cylindrical support wall hanging downward from the outer periphery of the closing wall, with a locking means formed on the outer surface of the support wall and an engaging protrusion formed on the inner periphery. The outer lid comprises a top wall and a cylindrical supported wall hanging downward from the underside of the top wall, with a locking means formed on the inner periphery of the supported wall. A sliding portion whose inner diameter corresponds to the outer diameter of the support wall is further formed below the locking means on the inner periphery of the supported wall. The lid main body is housed inside the supported wall of the outer lid, and is movable upward relative to the outer lid from a lowered position where the locking means is locked to the locking means of the supported wall. When the lid body is in the lowered position, the portion of the support wall of the lid body where the engaging protrusion is formed is located lower than the sliding portion on the supported wall of the outer lid when viewed in the vertical direction, and when the lid body is moved upward from the lowered position relative to the outer lid, the outer peripheral surface of that portion on the support wall of the lid body comes close to and faces the inner peripheral surface of the sliding portion on the supported wall of the outer lid.

[0003] When sealing the opening of an article, such as a beverage container, using the composite lid disclosed in Patent Document 1 below, the opening of the article is first inserted inside the lid body in the lowered position. During this process, the engaging protrusions formed on the inner peripheral surface of the support wall of the lid body elastically overcome the engaged protrusions formed on the outer peripheral surface of the opening of the article. Then, the outer lid is forced downward relative to the lid body. In other words, the lid body is forced upward relative to the outer lid from the lowered position. In this way, the portion of the support wall of the lid body where the engaging protrusions are formed is restrained by the sliding portion of the outer lid, preventing this portion from deforming radially outward. This allows the composite lid to continue sealing the opening of the article even if the article, whose opening is sealed with the composite lid attached, is exposed to high temperatures, such as in the hot sun, causing a significant increase in pressure within the article. Meanwhile, when opening the opening of the article, the outer lid is grasped and pulled upward. This causes the outer lid to rise relative to the lid body. In other words, the lid body is lowered relative to the outer lid and reaches a lowered position. This releases the aforementioned portion of the support wall of the lid body from the constraint of the sliding portion of the outer lid, allowing it to deform radially. Therefore, the engaging protrusion of the lid body can easily and elastically overcome the engaging protrusion formed on the outer peripheral surface of the opening of the item, and thus the composite lid including the lid body can be easily detached from the opening of the item. Therefore, the composite lid disclosed in Patent Document 1 below can be easily attached and detached to the opening of the item without excessive force, yet still reliably seal the opening of the item. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5390825 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, in the composite lid shown in Patent Document 1 above, if an item with a composite lid attached and a sealed mouth is exposed to high temperatures such as under the blazing sun and the pressure inside the item increases significantly, when the composite lid is removed from the mouth to open it, the outer lid is caused to rise relative to the lid body, and the part of the support wall of the lid body where the engaging protrusion is formed is released from the restraint by the sliding part of the outer lid, and there is a risk that the high pressure inside the item will cause the composite lid to fly off the mouth with force.

[0006] The present invention was made in consideration of the above facts, and its main technical objective is to provide a new and improved composite lid that can be easily attached and detached to the mouth of an item without requiring excessive force, yet can seal the mouth of the item securely, and that is prevented as much as possible from flying away forcefully when detached from the mouth even if the pressure inside the item increases. [Means for solving the problem]

[0007] After careful consideration, the inventors have found that the above-mentioned main technical problem can be solved by providing a through hole that penetrates vertically in the closing wall of the lid body and a closing means on the underside of the top wall of the outer lid, so that when the lid body is in the lowered position, the closing means of the outer lid opens the through hole, and when the lid body is moved upward from the lowered position relative to the outer lid, the outer surface of the part of the support wall of the lid body where the engaging protrusion is formed comes close to and faces the sliding portion on the inner surface of the supported wall of the outer lid, and then the closing means of the outer lid closes the through hole in the lid body.

[0008] That is, according to the present invention, a composite lid that solves the above-mentioned main technical problem comprises a lid body that includes a closing wall and a support wall that hangs down from the outer peripheral edge of the closing wall, and in which a locking means is formed on the outer peripheral surface of the support wall and an engaging protrusion is formed on the inner peripheral surface thereof; an outer cover including a top wall and a supported wall hanging downward from the underside of the top wall, the supported wall having a locking means formed on the inner circumferential surface thereof; In a composite lid, the lid body is accommodated inside the supported wall of the outer lid, and the locking means is movable upward relative to the outer lid from a lowered position where it is locked to the locked means of the supported wall, a through-hole penetrating in the vertical direction is provided in the closing wall of the lid body, and a closing means is provided on the lower surface of the top wall of the outer lid, a sliding portion having an inner diameter corresponding to the outer diameter of the support wall is further formed below the locking means on the inner peripheral surface of the support wall of the outer lid; When the lid body is located at the lowered position, the portion of the support wall of the lid body where the engaging protrusion is formed is located lower than the sliding portion of the supported wall of the outer lid when viewed in the up-down direction, and the closing means of the outer lid is spaced above the through hole of the lid body to open the through hole, A composite lid is provided in which, when the lid main body is moved upward relative to the outer lid from the lowered position, the outer peripheral surface of the portion of the supporting wall of the lid main body comes close to and faces the inner peripheral surface of the sliding portion of the supported wall of the outer lid, and then the closing means of the outer lid closes the through hole of the lid main body.

[0009] Preferably, the lower end of the support wall is formed with a plurality of vertically extending slits spaced apart in the circumferential direction, with a flap piece defined between each pair of circumferentially adjacent slits, and the engaging protrusion is disposed on the inner surface of each flap piece. The closure means is preferably a closure plug extending downward from the lower surface of the top wall of the outer cover. The locking means is preferably a circular locking rib extending continuously in the circumferential direction, with a vertically extending notch formed in the circular locking rib. Preferably, the outer peripheral surface of the support wall is formed with a circular guide rib extending continuously in the circumferential direction, with a vertically extending notch formed in the circular guide rib. Preferably, the closure wall is formed with a protrusion extending downward, with the through-hole formed in the protrusion. Preferably, a cylindrical auxiliary wall extending downward is provided on the lower surface of the outer peripheral edge of the top wall. [Effects of the Invention]

[0010] In the composite lid of the present invention, the outer peripheral surface of the portion of the support wall of the lid body where the engaging protrusion is formed comes into close contact with the inner peripheral surface of the sliding portion of the supported wall of the outer lid, and then the closing means of the outer lid closes the through hole in the lid body to seal the opening of the item. Therefore, when the composite lid is removed from the opening, the through hole in the lid body opens before the sliding portion of the supported wall of the outer lid opens the portion of the support wall of the lid body. In other words, the through hole in the lid body opens while the portion of the support wall of the lid body is restrained by the sliding portion of the supported wall of the outer lid, i.e., the pressure inside the item is released. Therefore, according to the present invention, even if the pressure inside the item rises significantly, the composite lid is prevented from flying away forcefully when removed from the opening. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a central longitudinal cross-sectional view of a preferred embodiment of a composite closure constructed in accordance with the present invention; [Figure 2] FIG. 2 is a perspective view of a lid body that constitutes the composite lid shown in FIG. [Figure 3] FIG. 2 is a perspective view of an outer lid that constitutes the composite lid shown in FIG. [Figure 4] 3A to 3C are diagrams showing steps for attaching and detaching the composite lid shown in FIG. 1 to the opening of an article. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings, which show preferred embodiments of a composite lid constructed in accordance with the present invention.

[0013] Referring to FIG. 1, a composite lid generally designated by the numeral 2 comprises a lid body 4 and an outer lid 6. Also referring to FIG. 2, the lid body 4 comprises a blocking wall 8 and a support wall 10 that hangs downward from the outer periphery of the blocking wall 8. A through-hole 12 is formed in the blocking wall 8, penetrating the blocking wall 8 in the vertical direction. In the illustrated embodiment, the blocking wall 8 is divided into a circular central portion 14, a cylindrical intermediate portion 16 that stands upward from the outer periphery of the central portion 14, and a ring-shaped outer periphery 18 that extends radially outward from the upper end of the intermediate portion 16. Thus, the blocking wall 8 is provided with a protruding portion 20 that protrudes downward by the central portion 14 and the intermediate portion 16, and the through-hole 12 is formed in the protruding portion 20. The through-hole 12 is circular and formed in the center of the blocking wall 8, and a cylindrical upstanding wall 22 that surrounds the outer periphery of the through-hole 12 and extends somewhat upward is formed on the upper surface of the blocking wall 8 (central portion 14). A circular contact ridge 24 that protrudes downward and extends circumferentially is formed on the underside of the outer peripheral portion 18. A circular restriction ridge 26 that protrudes upward and extends circumferentially is also formed on the outer peripheral edge of the upper surface of the outer peripheral portion 18.

[0014] In the illustrated embodiment, the support wall 10 is cylindrical. The support wall 10 has an intermediate portion 28 whose inner diameter gradually increases downward in the vertically intermediate portion (therefore, the inner peripheral surface of the intermediate portion 28 is frustoconical). The support wall 10 is divided into a thick-walled upper portion 30 above the intermediate portion 28 and a thin-walled lower portion 32 below the intermediate portion 28. A locking means is formed on the outer peripheral surface of the support wall 10. In the illustrated embodiment, the locking means is an annular locking rib 34 that extends continuously in the circumferential direction on the outer peripheral surface of the thick-walled upper portion 30, and the annular locking rib 34 has a notch 36 extending in the vertical direction. The thin-walled lower portion 32 has an annular guide rib 38 that extends continuously in the circumferential direction on the upper portion of its outer peripheral surface, and the annular guide rib 38 also has a notch 40 extending in the vertical direction. The notch 36 and the notch 40 are aligned in the circumferential direction. An engaging protrusion 42 is formed on the inner peripheral surface of the support wall 10. In the illustrated embodiment, a plurality of slits 44 extending linearly in the up-down direction are formed at intervals in the circumferential direction at the lower end of the thin-walled lower portion 32, and a flap piece 46 is defined between each pair of circumferentially adjacent slits 44, and the engaging protrusion 42 is disposed on the inner surface of each flap piece 46. When no load is applied to the flap piece 46 (this state is referred to as the "free state"), the flap piece 46 extends downward and inclined radially outward.

[0015] Referring to FIG. 3 together with FIG. 1 , the outer cover 6 includes a top wall 48. In the illustrated embodiment, the top wall 48 is circular. A blocking means is disposed on the underside of the top wall 48. In the illustrated embodiment, the blocking means is a solid rod-shaped block plug 50 with a circular cross section that hangs downward from the center of the underside of the top wall 48. A supported wall 52 also hangs downward from the underside of the top wall 48. In the illustrated embodiment, the supported wall 52 has a cylindrical shape that shares a central axis with the center of the top wall 48 and hangs downward from a radially intermediate portion of the top wall 48. A locking means 54 and a sliding portion 56 are formed on the inner circumferential surface of the supported wall 52. The sliding portion 56 is located below the locking means 54, and the inner diameter of the sliding portion 56 corresponds to the outer diameter of the support wall 10. In the illustrated embodiment, the sliding portion 56 is a cylindrical portion whose inner diameter is locally reduced in a lower portion slightly above the lower end of the supported wall 52. The inner diameter of the sliding portion 56 corresponds to the outer diameter of the support wall 10 excluding the portion where the flap piece 46 is defined. The locking means 54 is defined on the upper surface of the sliding portion 56. As shown in FIG. 1 , in a vertical cross section of the outer lid 6, the lower surface of the sliding portion 56 slopes downward toward the outside in the radial direction, and the lower surface of the sliding portion 56 and the inner circumferential surface are connected via a connecting portion 56a, which is an arc-shaped, i.e., curved, surface. In the illustrated embodiment, the lower end of the inner circumferential surface of the supported wall 52 is further provided with a cylindrical expanded diameter portion 57 whose diameter is larger than the outermost diameter of the flap piece 46 in a free state. The upper edge of the expanded diameter portion 57 is connected to the outer circumferential edge of the lower surface of the sliding portion 56. A cylindrical auxiliary wall 58 is also provided on the lower surface of the outer circumferential edge of the top wall 48, depending downward. Similar to the supported wall 52 , the auxiliary wall 58 also has a central axis common to the center of the top wall 48 .

[0016] The lid body 4 and the outer lid 6 are integrally molded from a relatively soft synthetic resin such as polyethylene and a relatively hard synthetic resin such as polypropylene, respectively. The outer lid 6 is then fitted onto the lid body 4, more specifically, the supported wall 52 of the outer lid 6 is aligned above the support wall 10 of the lid body 4. Then, the outer lid 6 is forced downward relative to the lid body 4, causing the annular locking rib 34 formed on the outer peripheral surface of the support wall 10 of the lid body 4 to resiliently overcome the sliding portion 56 and the locking means 54 formed on the inner peripheral surface of the supported wall 52 of the outer lid 6. In the illustrated embodiment, the annular guide rib 38 formed on the outer peripheral surface of the support wall 10 of the lid body 4 faces the sliding portion 56 formed on the inner peripheral surface of the supported wall 52 of the outer lid 6. This prevents the support wall 10 from tilting relative to the supported wall 52. Thus, the lid body 4 is housed inside the supported wall 52 of the outer lid 6. The lid body 4 housed inside the supported wall 52 is prevented from falling off the supported wall 52 by the engagement between the annular locking ridge 34 and the upper surface of the sliding portion 56, i.e., the locked means 54. The lid body 4 is then free to move upward relative to the outer lid 6 from the lowered position where the annular locking ridge 34, i.e., the locked means, is locked to the locked means 54.

[0017] 1 also shows the composite lid 2 and the mouth of a container to which the composite lid 2 is attached. The mouth 100 of the container, which can be made of a suitable synthetic resin such as polyethylene terephthalate or glass, is generally cylindrical and has an open top. A locking jaw 102 that protrudes radially outward is formed at the lower end of the outer periphery of the mouth 100. The vertical cross section of the locking jaw 102 is triangular, with an upper surface 104 whose outer diameter increases relatively gradually downward and a lower surface 106 whose outer diameter decreases relatively sharply.

[0018] When fitting the composite lid 2 to the opening 100 to seal it after filling the container with contents such as a soft drink, the composite lid 2, or more specifically, the lid body 4, is first fitted onto the opening 100. In the illustrated embodiment, the lower end of the support wall 10 of the lid body 4 is provided with a flap piece 46 that extends downward and radially outward in a free state, in a slanted manner, and the lower end of the inner peripheral surface of the supported wall 52 of the outer lid 6 is provided with an enlarged diameter portion 57. Therefore, when the composite lid 2 is fitted onto the opening 100, as shown in FIG. 4( a), the flap piece 46 remains in a free state at the enlarged diameter portion 57, and the protrusion 20 formed on the closing wall 8 of the lid body 4 enters the inside of the opening 100, and the abutting ridge 24 formed on the underside of the closing wall 8 abuts against the top surface of the opening 100. Therefore, the engaging protrusion 42 formed on the inner surface of the flap piece 46 is located below the locking jaw 102 of the mouth 100 when viewed in the vertical direction. Next, when the entire composite lid 2 is forced downward relative to the mouth 100, the lower surface of the closing wall 8 of the lid body 4 is already in contact with the top surface of the mouth 100, so the lid body 4 does not descend relative to the mouth 100, and the outer lid 6 is lowered relative to the lid body 4 and the mouth 100, so that the inner peripheral surface of the sliding portion 56 on the supported wall 52 of the outer lid 6 comes close to and faces the outer peripheral surface of the portion of the support wall 10 of the lid body 4 where the engaging protrusion 42 is formed (the flap piece 46 in the illustrated embodiment). At this time, in the illustrated embodiment, as shown in Figure 4(b), the lower edge of the sliding portion 56 on the inner peripheral surface of the supported wall 52 of the outer lid 6 acts on the outer peripheral surface of the flap piece 46 of the lid body 4, causing it to pivot radially inward and position the engaging protrusion 42 formed on the inner surface of the flap piece 46 below the locking jaw 102 of the mouth 100. This allows the user to position the engaging protrusion 42 below the locking jaw 102 without requiring much force. Furthermore, in the illustrated embodiment, the connecting portion 56a connecting the inner peripheral surface and the lower surface of the sliding portion 56 is arc-shaped, i.e., curved, in vertical cross section, making it even easier to position the engaging protrusion 42 below the locking jaw 102. When the outer lid 6 is further lowered relative to the lid body 4 and the mouth portion 100 from the state shown in Figure 4(b), the tip of the blocking plug 50 arranged on the top wall 48 of the outer lid 6 enters the through hole 12 formed in the blocking wall 8 of the lid body 4, as shown in Figure 4(c).Then, the restricting rib 26 formed on the upper surface of the closing wall 8 of the lid body 4 abuts against the lower surface of the top wall 48 of the outer lid 6, stopping the descent of the outer lid 6 relative to the lid body 4. In this way, the mouth 100 of the container is sealed by the composite lid 2.

[0019] According to the composite lid 2 of the present invention, the portion of the support wall 10 of the lid body 4 where the engaging protrusion 42 is formed is restrained by the sliding portion 56 of the supported wall 52 of the outer lid 6, preventing the portion from being deformed radially outward. As a result, even if a container to which the composite lid 2 is attached and whose mouth 100 is sealed is exposed to high temperatures such as under the blazing sun, causing the pressure inside the container to rise significantly, the composite lid 2 can continue to seal the mouth 100 of the container.

[0020] When opening the container opening 100, the composite lid 2, more specifically, the outer lid 6, is grasped and pulled upward relative to the container from the state shown in FIG. 4(c). This causes the outer lid 6 to rise relative to the lid body 4. In other words, the lid body 4 is lowered relative to the outer lid 6. At this time, in the composite lid of the present invention, as shown in FIG. 4(b), the through-hole 12 formed in the closing wall 8 of the lid body 4 is opened before the sliding portion 56 of the supported wall 52 of the outer lid 6 opens the portion of the supporting wall 10 of the lid body 4 where the engaging protrusion 42 is formed (in the illustrated embodiment, the flap piece 46). In other words, the through-hole 12 in the lid body 4 is opened while the above-mentioned portion of the supporting wall 10 of the lid body 4 is restrained by the sliding portion 56 of the supported wall 52 of the outer lid 6, i.e., the pressure inside the container is released. Therefore, according to the present invention, even if the pressure inside the container rises significantly, the composite lid 2 is prevented from flying away forcefully when it is released from the mouth 100. In the illustrated embodiment, the annular locking rib 34 and the annular guide rib 38 formed on the outer circumferential surface of the support wall 10 are provided with notches 36 and 40, respectively, so that the pressure released from the through hole 12 passes through the notches 36 and 40 and is released to the outside sufficiently smoothly. When the outer lid 6 is further raised relative to the lid body 4 from the state shown in FIG. 4(b), the sliding portion 56 of the supported wall 52 of the outer lid 6 releases the above-mentioned portion of the support wall 10 of the lid body 4, as shown in FIG. 4(a). As a result, in the illustrated embodiment, the flap piece 46 pivots radially outward, and the engaging protrusion 42 formed on the inner surface of the flap piece 46 releases radially outward from the underside of the locking jaw 102 of the mouth 100. Then, the locking means 54 formed on the inner peripheral surface of the supported wall 52 of the outer lid 6 is locked to the annular locking ridge 34 formed on the outer peripheral surface of the support wall 10 of the lid body 4. In other words, the lid body 4 is positioned in the lowered position. When the outer lid 6 is then raised relative to the mouth 100 of the container, the lid body 4 locked to the outer lid 6 in the lowered position also rises relative to the mouth 100 of the container, that is, the entire composite lid 2 rises relative to the mouth 100 of the container, and the engaging ridge 42 of the lid body 4 very easily climbs over the locking jaw 102 formed on the mouth 100 of the container, thereby opening the mouth 100 of the container.Therefore, the composite lid 2 of the present invention can be easily attached to and detached from the mouth 100 of the container without requiring excessive force, yet can still seal the mouth 100 of the container sufficiently reliably.

[0021] The composite lid constructed in accordance with the present invention has been described above in detail with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment, and appropriate modifications and variations are possible within the scope of the present invention. For example, in the illustrated embodiment, the closure means provided on the outer lid 6 is a closure plug 50 that hangs downward from the underside of the top wall 48. However, if desired, a closure piece biased downward by a biasing means such as a spring may close the upper surface of the through-hole 12 without entering it. Also, in the illustrated embodiment, multiple flaps 46 are defined at the lower end of the support wall 10 of the lid body 4. However, such flaps 46 are not necessarily required and may be omitted. In the illustrated embodiment, both the support wall and the supported wall are cylindrical, but they may also be rectangular. Furthermore, the support wall and the supported wall do not necessarily have to be cylindrical. A plurality of plate-like pieces hanging downward from the closure wall and the top wall may be arranged at intervals in the circumferential direction, resulting in an overall cylindrical shape, although not strictly cylindrical. Furthermore, the application of the composite lid constructed according to the present invention is not limited to the opening of a container, but can be applied to the opening of various articles such as tubes and piping. [Explanation of symbols]

[0022] 2: Composite lid 4: Lid body 6: Outer lid 8: Obstruction wall 10:Supporting wall 12:Through hole 34: Annular locking protrusion (locking means) 42: Engagement protrusion 48: Top wall 50: Occlusion plug (occlusion means) 52: Supported wall 54:Locked means 56: Sliding part 100: Mouth 102: Locking jaw

Claims

1. a cover body including a closing wall and a support wall hanging down from the outer periphery of the closing wall, the support wall having a locking means formed on its outer periphery and an engaging protrusion formed on its inner periphery; an outer cover including a top wall and a supported wall hanging downward from the underside of the top wall, the supported wall having a locking means formed on the inner circumferential surface thereof; In a composite lid, the lid body is accommodated inside the supported wall of the outer lid, and the locking means is movable upward relative to the outer lid from a lowered position where it is locked to the locked means of the supported wall, a through-hole penetrating in the vertical direction is provided in the closing wall of the lid body, and a closing means is provided on the lower surface of the top wall of the outer lid, a sliding portion having an inner diameter corresponding to the outer diameter of the support wall is further formed below the locking means on the inner peripheral surface of the support wall of the outer lid; When the lid body is located at the lowered position, the portion of the support wall of the lid body where the engaging protrusion is formed is located lower than the sliding portion of the supported wall of the outer lid when viewed in the up-down direction, and the closing means of the outer lid is spaced above the through hole of the lid body to open the through hole, When the lid body is moved upward relative to the outer lid from the lowered position, the outer peripheral surface of the portion of the support wall of the lid body comes close to and faces the inner peripheral surface of the sliding portion of the supported wall of the outer lid, and then the closing means of the outer lid closes the through hole of the lid body.

2. A composite lid as described in claim 1, wherein a plurality of slits extending in the vertical direction are formed at the lower end of the support wall at intervals in the circumferential direction, a flap piece is defined between each two circumferentially adjacent slits, and the engaging protrusion is arranged on the inner surface of each of the flap pieces.

3. 2. The composite closure of claim 1, wherein said closure means is a closure plug depending downwardly from the underside of said top wall of said outer closure.

4. 2. The composite closure according to claim 1, wherein said locking means is an annular locking ridge extending continuously in the circumferential direction, and said annular locking ridge is formed with a notch extending in the vertical direction.

5. 2. The composite lid according to claim 1, wherein an annular guide ridge extending continuously in the circumferential direction is formed on the outer peripheral surface of the support wall, and a notch extending in the vertical direction is formed in the annular guide ridge.

6. The composite lid according to claim 1 , wherein the closing wall is formed with a protruding portion that protrudes downward, and the through-hole is formed in the protruding portion.

7. 2. The composite lid according to claim 1, wherein a cylindrical auxiliary wall is provided on the lower surface of the outer peripheral edge of the top wall and hangs downward.

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