Container lid

Abstract

To provide a new container lid in which a vertical breakable line 38 provided on a surrounding wall 12 of an inner plug 4 can be easily broken when intended without increasing the amount of material used for molding the inner plug 4.SOLUTION: A locking projection 66 which can be locked to the circumferential slit 42 of the inner plug 4 is provided on the skirt wall 56 of the outer lid 6.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a container lid comprising an inner stopper made of synthetic resin to be attached to the mouth and neck of a container, and an outer lid made of synthetic resin to be detachably attached to the inner stopper. [Background technology]

[0002] Patent Document 1 below shows an example of a container closure comprising a synthetic resin inner stopper to be attached to the mouth and neck of a container and a synthetic resin outer lid detachably attached to the inner stopper. The inner stopper includes a main portion covering the top surface of the mouth and neck of the container, a cylindrical side wall hanging down from the outer periphery of the main portion, and an enclosing wall surrounding the side wall. A locking mechanism is formed on the inner circumferential surface of the side wall, and the inner stopper is attached to the mouth and neck of a container by fitting the inner stopper over the mouth and neck of the container and engaging the locking mechanism with a locking jaw formed on the outer circumferential surface of the mouth and neck of the container. The inner stopper further defines, in a counterclockwise direction as viewed from above, a surrounding wall separation region, a transition region, and a side wall separation region. The surrounding wall is cylindrical, and a vertically extending breakable line is provided at the upstream end of the surrounding wall separation region in the predetermined circumferential direction. A gripping piece is disposed on the upper surface of the surrounding wall at the upstream end of the surrounding wall separation region in the predetermined direction. A circumferential slit, open at its upper and lower surfaces, is provided between the surrounding wall and the side wall in the surrounding wall separation region downstream of the vertical breakable line in the predetermined circumferential direction. The transition region is provided with a vertical slit that penetrates the side wall in the radial direction and extends upward from the lower end of the side wall beyond the locking means when viewed in the vertical direction, and a connecting portion that connects the surrounding wall to the side wall downstream of the vertical slit in the predetermined circumferential direction. The side wall separation region is provided with a connecting wall that extends continuously in the circumferential direction and connects the surrounding wall to the side wall, and a circumferential breakable line that extends in the predetermined circumferential direction from the upper end of the vertical slit on the outer circumferential surface of the side wall along the inner peripheral edge of the connecting wall.

[0003] With the container lid described above, after all the contents have been discharged, the inside stopper can be detached from the neck of the container and disposed of separately. To detach the inside stopper from the neck of the container, first, the gripping piece is grasped and forced radially outward to break the vertical breakable line formed in the surrounding wall. Next, the gripped gripping piece is forced radially outward to gradually separate the surrounding wall from the side wall (surrounding wall separation region). Thereafter, the gripping piece is further forced radially outward to break the circumferential breakable line in the counterclockwise direction starting from the vertical slit formed in the transition region, gradually separating the side wall from the neck of the container (side wall separation region). After most of the side wall has been separated from the neck of the container, the main portion is forced upward to detach the inside stopper from the neck of the container. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-24592 Summary of the Invention [Problem to be solved by the invention]

[0005] In the container lid disclosed in Patent Document 1, when the inside plug is to be removed from the mouth and neck of the container, the vertical breakable line formed in the surrounding wall can be easily broken by grasping the tabs and forcing them radially outward, but due to the presence of the tabs, when multiple inside plugs are transported simultaneously in a container, etc., the tabs of adjacent inside plugs may become entangled, causing the vertical breakable line to be unintentionally broken. Furthermore, the presence of the tabs increases the amount of material used.

[0006] The present invention has been made in consideration of the above facts, and the technical object of the present invention is to provide a new and improved container lid that can easily break the vertical breakable line provided on the surrounding wall of the inside plug when intended, without increasing the amount of material used. [Means for solving the problem]

[0007] As a result of extensive research, the present inventors have found that the above technical problem can be solved by providing a locking protrusion on the skirt wall of the outer lid that can be locked into a circumferential slit in the inside plug.

[0008] That is, according to the present invention, a container lid that solves the above technical problems comprises an inner stopper made of synthetic resin that is attached to the mouth and neck of a container, and an outer lid made of synthetic resin that is detachably attached to the inner stopper, The inside plug includes a main portion that covers the top surface of the mouth and neck of the container, a cylindrical side wall that hangs down from the outer periphery of the main portion, and a surrounding wall that surrounds the side wall, and a locking means is formed on the inner periphery of the side wall, The inner plug further has a surrounding wall separation region, a transition region, and a side wall separation region defined in sequence in a predetermined circumferential direction, the surrounding wall is cylindrical, and an upstream end of the surrounding wall separation region in the predetermined circumferential direction is provided with a vertically rupturable line extending in the vertical direction, or the surrounding wall is arc-shaped, and the upstream end of the surrounding wall separation region in the predetermined circumferential direction is connected to the side wall via a vertically rupturable line extending in the vertical direction, a circumferential slit having an open upper surface and / or a open lower surface is provided between the surrounding wall and the side wall downstream of the vertical rupturable line in the surrounding wall separation region in the predetermined circumferential direction, The transition region is provided with a vertical slit that penetrates the side wall in the radial direction and extends upward from the lower end of the side wall beyond the locking means when viewed in the up-down direction, and a connecting portion that is adjacent to the vertical slit and connects the surrounding wall and the side wall downstream of the vertical slit in the predetermined circumferential direction, In the container lid, the side wall separation region is provided with a connecting wall that extends continuously in a circumferential direction and connects the surrounding wall and the side wall, and a circumferential breakable line that extends from an upper end of the vertical slit in the predetermined circumferential direction on the outer peripheral surface of the side wall along an inner peripheral edge of the connecting wall, The container lid is characterized in that the outer lid has a top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, and the skirt wall is formed with a locking protrusion that can be locked into the circumferential slit of the inner plug.

[0009] Preferably, the skirt wall has a notch at its lower end, and the locking projection projects downward from the bottom of the notch. In this case, the lower surface of the locking projection is aligned vertically with the lower surface of the skirt wall where the notch is not formed. [Effects of the Invention]

[0010] In the container lid constructed according to the present invention, the locking projections formed on the skirt wall of the outer lid are engaged with the circumferential slits of the inside plug and forced radially outward to break the vertical breakable line formed on the surrounding wall, so that the vertical breakable line can be easily broken without directly grasping the required portion of the surrounding wall with fingers. Therefore, according to the present invention, since there is no need to provide a separate tab on a part of the surrounding wall, the tabs will not interfere with each other and cause unintentional breakage of the vertical breakable line when transporting a large number of inside plugs simultaneously in a container, etc., and the amount of material used will not increase. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a central vertical cross-sectional view showing a preferred embodiment of a container lid constructed according to the present invention. [Figure 2] FIG. 2 is a front view of the inner plug of the container lid shown in FIG. [Figure 3] FIG. 2 is a plan view of the inner plug of the container lid shown in FIG. [Figure 4] FIG. 2 is a bottom view of the inner plug of the container lid shown in FIG. [Figure 5] FIG. 2 is a front view of the outer lid of the container lid shown in FIG. [Figure 6] FIG. 2 is a bottom view of the outer lid of the container lid shown in FIG. [Figure 7]2 is a central vertical cross-sectional view of the container lid shown in FIG. 1 in a state in which a locking protrusion formed on the outer lid is locked into a circumferential slit in the inside plug. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a more detailed description will be given with reference to the accompanying drawings showing preferred embodiments of a container lid constructed according to the present invention.

[0013] 1, a container closure constructed in accordance with the present invention and generally designated by the numeral 2 is comprised of an inner stopper 4 and an outer lid 6. The inner stopper 4 can be injection molded from a relatively soft synthetic resin such as polyethylene, and the outer lid 6 can be injection molded from a relatively hard synthetic resin such as high-density polyethylene or polypropylene.

[0014] 2 to 4, the inside plug 4 includes a main portion 8 that is circular in plan view, a cylindrical side wall 10 that depends from the circular outer peripheral edge of the main portion 8, and a cylindrical surrounding wall 12 that surrounds the side wall 10. The main portion 8 is equipped with an annular outer top wall 14 that extends substantially horizontally, a cylindrical mounting wall 16 that stands upward from the inner peripheral edge of the outer top wall 14, an annular inner top wall 18 that extends radially inward from the upper end of the mounting wall 16, and a cylindrical discharge tube 20 that extends upward from the inner peripheral edge of the inner top wall 18. A circumferentially extending annular seal piece 22 that depends downward is formed on the inner peripheral edge of the lower surface of the outer top wall 14. A male thread 24 is formed on the outer peripheral surface of the mounting wall 16. Four vertically extending auxiliary ribs 25 are formed at equal angular intervals around the periphery on the upper end of the inner peripheral surface of the mounting wall 16. The upper end surfaces of the auxiliary ribs 25 are connected to the lower surface of the inner upper wall 18. The upper end of the discharge tube 20 is curled radially outward, defining a circular discharge opening 26 inside the discharge tube 20. The side wall 10 hangs down from the outer peripheral edge of the lower surface of the outer upper wall 14 of the main portion 8, and a locking means is formed at the lower end of the inner peripheral surface of the side wall 10. In the illustrated embodiment, the locking means is a locking protrusion 28 that protrudes radially inward and extends circumferentially, and multiple such locking protrusions 28 are arranged at intervals around the periphery. The vertical width of the surrounding wall 12 is narrower than that of the side wall 10, and the lower surface of the surrounding wall 12 is vertically aligned with the lower surface of the side wall 10. The connection between the surrounding wall 12 and the side wall 10 will be described later.

[0015] 3 and 4, the inside plug 4 further includes a surrounding wall separation region 30, a transition region 32, and a side wall separation region 34, which are defined in this order in a predetermined circumferential direction (hereinafter, this direction will be referred to as "direction D" and indicated by an arrow in the figures). In the illustrated embodiment, direction D is counterclockwise when viewed from above. Therefore, direction D is counterclockwise in FIG. 3, which shows a plan view of the inside plug 4, but clockwise in FIG. 4, which shows a bottom view of the inside plug 4. In the illustrated embodiment, a non-separation region 36 is further defined between the side wall separation region 34 and the surrounding wall separation region 30 when viewed in direction D. If desired, direction D, i.e., the predetermined circumferential direction, may be clockwise when viewed from above.

[0016] A vertically rupturable line 38 extending in the vertical direction is provided on the surrounding wall 12 at the upstream end of the surrounding wall separation region 30 in the direction D. In the illustrated embodiment, the vertically rupturable line 38 is thin-walled. The outer diameter of the surrounding wall 12 at the downstream end 40 of the non-separation region 36 in the direction D is reduced, and the vertically rupturable line 38 connects the inner peripheral surface of the surrounding wall 12 at the upstream edge of the surrounding wall separation region 30 in the direction D to the outer peripheral surface of the surrounding wall 12 at the downstream edge of the non-separation region 36 in the direction D. In the surrounding wall separation region 30, a circumferential slit 42 with an open upper and / or lower surface is provided between the inner peripheral surface of the surrounding wall 12 and the outer peripheral surface of the side wall 10. In the illustrated embodiment, the circumferential slit 42 is open in the vertical direction, i.e., its upper and lower surfaces are open, except for the portion where a breakable bridge portion 46 (described later) is provided. If only one of the upper and lower surfaces of the circumferential slit 42 is open, the other must be a breakable connecting wall. A downwardly displaced notch 44 is formed in the upper surface of the surrounding wall 12 at the upstream end of the surrounding wall separation region 30 in direction D. On the downstream side of the surrounding wall separation region 30 in direction D, the outer peripheral surface of the side wall 10 and the inner peripheral surface of the surrounding wall 12 are locally connected by a breakable bridge portion 46. Three breakable bridge portions 46 are arranged circumferentially spaced apart downstream of the notch 44 in direction D, connecting the upper end of the inner peripheral surface of the surrounding wall 12 to the vertical middle portion of the outer peripheral surface of the side wall 10.

[0017] 4, the transition region 32 is provided with a vertical slit 48 that penetrates the side wall 10 in the radial direction and extends upward from the lower end of the side wall 10 beyond the locking protrusion 28 when viewed in the vertical direction, and a connection portion 50 that is adjacent to the vertical slit 48 on the downstream side of the vertical slit 48 in direction D and connects the surrounding wall 12 and the side wall 10. In the illustrated embodiment, the connection portion 50 is provided at the downstream end of the transition region 32 in direction D, and the upstream side surface of the connection portion 50 in direction D extends radially inward at an angle toward the downstream side in direction D.

[0018] 1 to 4, the side wall separation region 34 is provided with a connecting wall 52 that extends continuously in the circumferential direction and connects the upper end of the surrounding wall 12 to the outer peripheral surface of the side wall 10. The side wall separation region 34 is further provided with a circumferential breakable line 53 that extends in direction D from the upper end of the vertical slit 48 along the inner peripheral edge of the upper surface of the connecting wall 52 on the outer peripheral surface of the side wall 10. The circumferential breakable line 53 is formed by locally reducing the outer diameter of the side wall 10.

[0019] 4, in the non-separation region 36, the surrounding wall 12 is firmly connected to the side wall 10, and the surrounding wall 12 cannot be separated from the side wall 10. Therefore, as shown in FIG. 2, the non-separation region 36 does not have a circumferential breakable line 53.

[0020] Continuing the explanation with reference to Figures 5 and 6 in addition to Figure 1, the outer lid 6 has a circular top wall 54 and a cylindrical skirt wall 56 that hangs down from the outer periphery of the top wall 54. A relatively short, cylindrical sealing wall 58 hangs down from the center of the underside of the top wall 54, and a relatively long, cylindrical mounting wall 60 hangs down from the outer periphery. A female thread 62 is formed at the lower end of the inner periphery of the mounting wall 60. The vertical cross section of the skirt wall 56 slopes radially outward from the outer periphery of the top wall 54 in an arc-like shape and then hangs down vertically. A so-called knurling 64 is formed in the vertical middle of the outer periphery of the skirt wall 56 to prevent slippage of a finger placed thereon. It is important to note that in a container lid constructed according to the present invention, the skirt wall 56 is formed with a locking protrusion 66 that can be engaged with the circumferential slit 42 of the inside plug 4. In the illustrated embodiment, a downward-facing U-shaped notch 68 is provided at the lower end of the skirt wall 56, and the locking projection 66 projects downward from the bottom surface of the notch 68. The lower surface of the locking projection 66 is aligned in the up-down direction with the lower surface of the skirt wall 56 in the portion where the notch 68 is not formed.

[0021] Continuing the explanation with reference to Figure 1, the inner plug 4 and outer lid 6 as described above are combined with each other by rotating the inner plug 4 in the closing direction, i.e., the outer lid 6 clockwise as viewed from above, relative to the inner plug 4, with the outer lid 6 fitted over the inner plug 4, and threading the male thread 24 of the inner plug 4 onto the female thread 62 of the outer lid 6. At this time, the auxiliary rib 25 is engaged with a support (not shown) and functions as a rotation stopper for the inner plug 4. When the inner plug 4 and outer lid 6 are combined as required, the sealing wall 58 of the outer lid 6 enters the inside of the discharge tube 20 of the inner plug 4, and the outer peripheral surface of the sealing wall 58 comes into close contact with the inner peripheral surface of the discharge tube 20, thereby closing the discharge opening 26.

[0022] 1 also shows a container lid 2 and the neck of the container to which the lid 2 is attached. The neck 100 of the container, which can be made of a suitable synthetic resin such as polyethylene terephthalate or glass, is cylindrical overall and has an open top. At the upper end of the outer circumferential surface of the neck 100, there are formed an annular engaging ridge 102 that protrudes radially outward, and a support ring 104 located below the engaging ridge 102. As is well known to those skilled in the art, the support ring 104 is used when the container is transported.

[0023] When the container lid 2 is fitted to the mouth / neck portion 100 of the container to seal the mouth / neck portion 100 after filling the container with contents such as a liquid seasoning, the container lid 2 is fitted over the mouth / neck portion 100 and forcibly lowered relative to the mouth / neck portion 100 to the position shown in Figure 1. Then, the container lid 2, more specifically, the locking ribs 28 of the inside plug 4, elastically move downward over the locking ribs 102 of the mouth / neck portion 100 and lock onto them, thereby securing the inside plug 4 to the mouth / neck portion 100. At this time, the underside of the outer upper wall 14 of the main portion 8 of the inside plug 4 comes into close contact with the top surface of the mouth / neck portion 100, and the seal piece 22 enters the mouth / neck portion 100, bringing the outer periphery of the seal piece 22 into close contact with the inner periphery of the mouth / neck portion 100, thereby sealing the mouth / neck portion 100. Therefore, the main portion 8 of the inside plug 4 covers the top surface of the mouth / neck portion 100.

[0024] When the contents of the container are to be consumed, the knurling 64 on the skirt wall 56 of the outer lid 6 is hooked with the fingers and the outer lid 6 attached to the inside plug 4 is rotated in the opening direction, i.e., counterclockwise when viewed from above. Rotating the outer lid 6 in the opening direction relative to the inside plug 4 releases the female thread 62 of the outer lid 6 from the male thread 24 of the inside plug 4, causing the outer lid 6 to rise relative to the inside plug 4. When this threading is completely released and the outer lid 6 is removed from the inside plug 4, the discharge opening 26 of the inside plug 4 is exposed. The contents can then be discharged to the outside through the discharge opening 26 by grasping the body of the container (not shown) and tilting it appropriately. After the container is turned upright to stop the contents from being discharged, the outer lid 6 is fitted over the inside plug 4 and rotated in the closing direction to the position shown in FIG. 1. As a result, the sealing wall 58 of the outer lid 6 again enters the inside of the discharge tube 20 of the inner plug 4, and the outer surface of the sealing wall 58 comes into close contact with the inner surface of the discharge tube 20, thereby closing the discharge opening 26 again.

[0025] After the contents of the container have been consumed, the entire container lid 2 is removed from the container neck portion 100 for the purpose of separating and collecting the waste. At this time, the outer lid 6 is first removed from the inside plug 4. To remove the inside plug 4 from the container neck portion 100, first, the vertical rupturable line 38 provided on the surrounding wall 12 at the upstream end of the surrounding wall separation region 30 in direction D is broken.

[0026] Here, the vertical rupturable line 38 can be broken by grasping the surrounding wall 12 at the upstream end in direction D with the fingers and forcing it radially outward, but since the gap between the surrounding wall 12 and the side wall 10 is usually considerably narrower than the thickness of the fingers, it is not always easy for a user to grasp the surrounding wall 12. However, in the container lid constructed according to the present invention, as shown in Figure 7, the vertical rupturable line 38 formed on the surrounding wall 12 can be broken by engaging the locking protrusions 66 formed on the skirt wall 56 of the outer lid 6 with the circumferential slits 42 of the inner plug 4 and forcing it radially outward, so that the vertical rupturable line 38 can be easily broken without directly grasping the required portion of the surrounding wall 12 with the fingers. Therefore, according to the present invention, there is no need to provide a separate tab on a part of the surrounding wall 12. Therefore, when transporting a large number of inside plugs 4 simultaneously in a container, the tabs will not interfere with each other, causing the vertical breakable line 38 to be unintentionally broken, and the amount of material used will not increase. In the illustrated embodiment, the circumferential slit 42 formed in the inside plug 4 penetrates in the vertical direction, so the locking protrusion 66 of the outer lid 6 can enter the circumferential slit 42 from either above or below. However, considering that contents may be attached to the inside of the discharge tube 20, it is preferable that the locking protrusion 66 of the outer lid 6 enter the circumferential slit 42 from below. This is because when the locking protrusion 66 of the outer lid 6 enters the circumferential slit 42 from below, the lower surface of the top wall 54 of the outer lid 6 faces upward, preventing contents attached to the lower surface of the top wall 54 from dripping. In the illustrated embodiment, a notch 68 is provided at the lower end of the skirt wall 56, and the locking projection 66 projects downward from the bottom surface of the notch 68, preventing the locking projection 66 from projecting radially, thereby minimizing damage to the locking projection 66 due to external impact. Furthermore, in the illustrated embodiment, the lower surface of the locking projection 66 is aligned in the vertical direction with the lower surface of the skirt wall 56 in the portion where the notch 68 is not formed, further preventing damage to the locking projection 66 due to external impact.

[0027] After the vertical breakable line 38 is broken, the surrounding wall 12 at the upstream end in direction D is grasped and forced radially outward, gradually separating the surrounding wall 12 from the side wall 10 in the surrounding wall separation region 30. When the surrounding wall 12 is gradually separated from the side wall 10 in the surrounding wall separation region 30, the breakable bridging portions 46 are successively broken toward the downstream in direction D. Thereafter, the upstream portion (the surrounding wall 12 at the upstream end in direction D) is further forced radially outward, gradually breaking the circumferential breakable line 53 in direction D in the side wall separation region 34 starting from the vertical slit 48 formed in the transition region 32, gradually separating the side wall 10 from the container neck portion 100. After the side wall 10 has been separated from the container neck portion 100 in most of the side wall separation region 34, the main portion 8 can be forced upward, allowing the inside plug 4 to be sufficiently easily separated from the container neck portion 100. If the non-separation region 36 were not present, the surrounding wall 12 would be broken over the entire circumferential direction and completely separated from the inside plug 4, causing most of the locking ridges 28 of the inside plug 4 that had been locked with the locking ridges 102 of the container neck portion 100 to be released from the container neck portion 100. Therefore, even in this case, the inside plug 4 can be sufficiently easily released from the container neck portion 100.

[0028] Although the container lid constructed according to the present invention has been described in detail above with reference to the accompanying drawings, 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 surrounding wall 12 is cylindrical, and the vertical rupturable line 38 is provided at the upstream end of the surrounding wall separation region 30 in the direction D. However, if desired, the surrounding wall 12 may be arc-shaped, and the upstream end of the surrounding wall 12 in the direction D of the surrounding wall separation region 30 may be connected to the side wall 10 via the vertical rupturable line 38. [Explanation of symbols]

[0029] 2: Container lid 4: Inner stopper 6: Outer lid 8: Main section 10: Side wall 12: Enclosure wall 28:Latching protrusion (locking means) 30: Surrounding wall separation area 32:Transition region 34: Side wall separation area 38: Vertical breakable line 42: Circumferential slit 48: Vertical slit 50: Connection 52: Connecting wall 53: Circumferential breakable line 54: Top wall 56: Skirt Wall 66: Locking protrusion 68:Notch 100: Container neck D: Direction (prescribed circumferential direction)

Claims

1. The container is provided with an inner plug made of synthetic resin that is attached to the mouth and neck of the container, and an outer lid made of synthetic resin that is detachably attached to the inner plug, The inside plug includes a main portion that covers the top surface of the mouth and neck of the container, a cylindrical side wall that hangs down from the outer periphery of the main portion, and a surrounding wall that surrounds the side wall, and a locking means is formed on the inner periphery of the side wall, The inner plug further has a surrounding wall separation region, a transition region, and a side wall separation region defined in sequence in a predetermined circumferential direction, the surrounding wall is cylindrical, and an upstream end of the surrounding wall separation region in the predetermined circumferential direction is provided with a vertically rupturable line extending in the vertical direction, or the surrounding wall is arc-shaped, and the upstream end of the surrounding wall separation region in the predetermined circumferential direction is connected to the side wall via a vertically rupturable line extending in the vertical direction, a circumferential slit having an open upper surface and / or a open lower surface is provided between the surrounding wall and the side wall downstream of the vertical rupturable line in the surrounding wall separation region in the predetermined circumferential direction, The transition region is provided with a vertical slit that penetrates the side wall in the radial direction and extends upward from the lower end of the side wall beyond the locking means when viewed in the up-down direction, and a connecting portion that is adjacent to the vertical slit and connects the surrounding wall and the side wall downstream of the vertical slit in the predetermined circumferential direction, In the container lid, the side wall separation region is provided with a connecting wall that extends continuously in a circumferential direction and connects the surrounding wall and the side wall, and a circumferential breakable line that extends from an upper end of the vertical slit in the predetermined circumferential direction on the outer peripheral surface of the side wall along an inner peripheral edge of the connecting wall, The outer lid has a top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, and the skirt wall is formed with a locking protrusion that can be locked into the circumferential slit of the inner plug.

2. 2. The container lid according to claim 1, wherein a notch is provided at the lower end of the skirt wall, and the locking projection projects downward from the bottom surface of the notch.

3. 3. The container lid according to claim 2, wherein a lower surface of the locking projection is aligned vertically with a lower surface of the skirt wall in a portion where the notch is not formed.

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