JP4060403B2 - Plastic container lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin container lid applied to the mouth / neck portion of a container having a locking jaw portion formed on the outer peripheral surface, and more particularly, to a locking formed on the inner peripheral surface of a hanging wall. The present invention relates to a synthetic resin container lid having a shape in which a protrusion is locked to a locking jaw of the mouth and neck and is mounted on the mouth and neck.
[0002]
[Prior art]
As is well known to those skilled in the art, as a container for contents such as a liquid seasoning, a container having a cylindrical mouth and neck portion having a locking jaw portion formed on the outer peripheral surface is widely used. . And the thing of the form comprised from the synthetic resin lid main body and the synthetic resin outer cover combined with this as a container lid applied to the mouth neck part of such a container is provided practically. The lid body includes a circular top wall and a cylindrical hanging wall depending from the periphery of the top wall. The top wall is provided with an opening portion that is a separation region defined by a breaking line. A connecting pillar extending upward and a grip ring connected to the connecting pillar are attached to the opening portion. A discharge guide tube extending upward from the outside of the opening is disposed on the top wall. A locking ridge is formed on the inner peripheral surface of the hanging wall. Such a lid body is engaged with a locking jaw formed on the outer peripheral surface of the mouth-and-neck portion by fitting a locking ridge formed on the inner peripheral surface of the hanging wall by being fitted to the mouth-and-neck portion of the container. It is attached to the mouth and neck by stopping. An outer lid that is formed separately from the lid main body or can be formed integrally with the lid main body via the hinge connecting portion is fitted on the lid main body to cover the discharge guide tube. When discharging the contents, the outer lid is opened to expose the discharge guide tube. Next, a finger is put on the grip ring and pulled to break the breaking line formed on the top wall, and the unsealed part is separated to generate a discharge opening on the top wall. After that, when the container is tilted, the stored contents are discharged through the generated discharge opening, guided by the discharge guide tube and poured out.
[0003]
Thus, recently, there is a demand for so-called segregated disposal in which waste is separated according to material. In order to satisfy such a demand, the contents contained in the container are related to the container lid described above. After consuming, it is necessary that not only the outer lid but also the lid body is detached from the container made of glass or different synthetic resin and discarded separately from the container.
[0004]
In order to allow the lid body to be easily removed from the mouth-neck portion of the container, Japanese Utility Model Laid-Open No. 6-32353 and Japanese Patent Laid-Open No. 7-52963 have an appropriate form on the hanging wall of the lid body. Forming a rupture line is disclosed. In the lid body in which such a breaking line is formed, when the lid body is detached from the mouth and neck portion of the container, the breaking line formed in the hanging wall is broken, and the outer peripheral surface of the mouth and neck portion The locking ridge formed on the inner peripheral surface of the hanging wall with respect to the locking jaw formed on the inner wall can be released, and thus the lid main body can be removed from the mouth and neck part sufficiently easily.
[0005]
However, the lid body of the above-described form disclosed in Japanese Utility Model Laid-Open No. 6-32353 and Japanese Patent Laid-Open No. 7-52963 has the following problems. That is, when the lid body is mounted on the mouth and neck of the container, the hanging wall and / or the locking protrusion is elastically deformed so that the locking protrusion gets over the locking jaw of the mouth and neck. However, at this time, a considerable force acts on the breaking line formed on the hanging wall, and there is a high possibility that the breaking line is broken due to this.
[0006]
In order to solve the above problem, Japanese Utility Model Laid-Open No. 7-8249, Japanese Utility Model Laid-Open No. 7-9751 and Japanese Patent Application Laid-Open No. 9-58718 have some reductions in the wall thickness of the hanging wall and the axial direction on the hanging wall. It is disclosed that one or a plurality of slits extending in the direction are formed, and a reinforcing wall surrounding the hanging wall is provided. In the lid body provided with such a reinforcing wall, when the lid body is attached to the mouth and neck portion of the container, the hanging wall is reinforced by the reinforcing wall, and the lid body attached to the mouth and neck portion of the container is Sufficient prevention of accidental detachment from the mouth and neck is prevented. On the other hand, when removing the lid body from the mouth and neck of the container, the reinforcing wall is detached from the hanging wall. In this way, the wall thickness of the drooping wall is reduced, and since the slit extending in the axial direction is formed in the drooping wall, it is elastic enough to move radially outward when the drooping wall is moved upward. And the locking ridge formed on the inner peripheral surface of the hanging wall with respect to the locking jaw formed on the mouth-neck portion can be released, so that the container can be easily and sufficiently released. The lid body can be removed from the mouth and neck.
[0007]
[Problems to be solved by the invention]
However, the container lids disclosed in Japanese Utility Model Laid-Open No. 7-8249, Japanese Utility Model Laid-Open No. 7-9751 and Japanese Patent Application Laid-Open No. 9-58718 are still not fully satisfactory and have the following problems. . First, in the container lid disclosed in Japanese Utility Model Laid-Open Nos. 7-8249 and 7-9751, the reinforcing wall is formed separately from the hanging wall of the lid body and is assembled to the hanging wall. For this reason, the manufacturing process is relatively complicated and the manufacturing cost is relatively high. In addition, regarding the container lid disclosed in JP-A-9-58718, the inner peripheral surface of the reinforcing wall is in close contact with the outer peripheral surface of the hanging wall. If not impossible, it is not always easy, and it is usually necessary to perform a cutting process after injection molding or compression molding to separate the hanging wall and the reinforcing wall. Similar to the container lid disclosed in Japanese Laid-Open Patent Publication No. 7-9751 and Japanese Utility Model Laid-Open No. 7-9751, the production process is relatively complicated and the production cost is relatively high. Furthermore, when removing the reinforcing wall from the hanging wall, it is necessary to move the reinforcing wall in the axial direction to break the connection bridge portion disposed between the two, but such a breaking operation is not necessarily performed. Not easy.
[0008]
The present invention has been made in view of the above-mentioned facts, and its main technical problem is a form in which a reinforcing wall surrounding the hanging wall of the lid body is disposed, and the lid body is attached to the mouth and neck of the container. In the mounted state, the drooping wall is reinforced by the reinforcing wall, and the lid body attached to the mouth / neck portion of the container is sufficiently reliably prevented from being accidentally detached from the mouth / neck portion. Nevertheless, the reinforcing wall surrounding the drooping wall and the surrounding wall are manufactured simply and inexpensively by injection molding or compression molding, and also easy enough to remove the lid body from the mouth and neck of the container It is an object of the present invention to provide a new and improved synthetic resin container lid that can release the reinforcing action of the hanging wall by at least partially detaching the reinforcing wall from the hanging wall.
[0009]
[Means for Solving the Problems]
In order to achieve the main technical problem described above, in the present invention, a cylindrical reinforcing wall surrounding the hanging wall is connected to the hanging wall through a narrow connection portion having a width of 0.2 to 0.8 mm. In this embodiment, the reinforcing wall is formed with a main break line extending from the upper end or the lower end thereof to the connection portion, and at least a part of the narrow connection portion is formed into an easily breakable thin-walled region. When connecting the hanging wall and the reinforcing wall with a narrow connection portion having a width of 0.2 mm or more, the annular mold piece to be inserted between the hanging wall and the reinforcing wall is made too thin. The hanging wall and the reinforcing wall can be manufactured easily and inexpensively by injection molding or compression molding without causing problems such as excessive reduction of the strength. On the other hand, since the width of the narrow connection portion connecting the hanging wall and the reinforcing wall is 0.8 mm or less, the inner peripheral surface of the reinforcing wall can be made sufficiently close to the outer peripheral surface of the hanging wall. Thus, the drooping wall can be reinforced sufficiently well. When detaching the reinforcing wall from the hanging wall, the main breaking line of the reinforcing wall is broken, and then the reinforcing wall is gradually pulled from the broken end of the reinforcing wall in the circumferential direction and radially outward. The easily breakable region of the connecting portion can be broken, and thus the reinforcing action of the hanging wall can be ensured by the reinforcing wall.
[0010]
That is, according to the present invention, as a synthetic resin container lid that achieves the main technical problem, the synthetic resin applied to the cylindrical mouth-neck part of the container having a locking jaw part formed on the outer peripheral surface. The container lid has a cylindrical hanging wall, and on the inner peripheral surface of the hanging wall, a locking protrusion that is locked to the locking jaw portion of the mouth and neck is formed. A locking body is provided with a lid body that is attached to the mouth and neck by locking the locking ridge to the locking jaw, and a cylindrical reinforcing wall surrounding the hanging wall is disposed, The reinforcing wall is connected to the hanging wall via a narrow connecting portion having a width of 0.2 to 0.8 mm, and the reinforcing wall has a main break line extending from the upper end or the lower end to the narrow connecting portion. Formed, The narrow connection portion includes an easily-breakable thin-wall region continuously extending in the circumferential direction from the tip of the main break line and a non-breakable thick-wall region extending in the circumferential direction subsequently to the hanging wall. Has an additional break line extending from the lower end thereof to at least the upper side of the locking ridge at the downstream end of the easily breakable thin region in the narrow connection portion, and the lid body includes an outer lid. The outer lid has a top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall, and an internal thread is formed on the inner peripheral surface of the skirt wall, and the lid body A male thread is formed on the outer peripheral surface of the reinforcing wall, and the female thread formed on the skirt wall of the outer lid is screwed onto the male thread formed on the reinforcing wall. The outer lid is attached to the lid body; In a state where the lid body is attached to the mouth and neck portion, the reinforcing wall extends in a radial direction. The lid body is removed from the mouth and neck. There is provided a container lid characterized in that the drooping wall is restricted and the drooping wall is reinforced.
[0011]
The width of the narrow connection portion is preferably 0.2 to 0.5 mm. Preferably, the narrow connection portion includes an easily ruptured thin-walled region extending continuously in the circumferential direction from the tip of the main rupture line, and subsequently a non-breaking thick-walled region extending in the circumferential direction. . The narrow connection portion is disposed below the locking protrusion in the axial direction, connects the lower end of the reinforcing wall to the drooping wall, and the main break line extends from the upper end of the reinforcing wall. It extends to the narrow connection portion, and gradually increases upward between the outer peripheral surface of the hanging wall and the inner peripheral surface of the reinforcing wall, and 0.7 to 1.3 mm at the upper end of the reinforcing wall. It is preferred that there is a gap that is In a preferred embodiment, the reinforcing wall protrudes upward beyond the upper end of the drooping wall on the downstream side of the main breaking line as viewed in the extending direction of the easily breakable thin region in the narrow connection portion. A gripping part is provided. The reinforcing wall extends from the upper end toward the narrow connection portion at a predetermined interval downstream from the main break line as viewed in the extending direction of the easily breakable thin region in the narrow connection portion. Conveniently, an auxiliary break line is formed. In order to make it easier to remove the lid body from the mouth and neck of the container, the hanging wall is provided at the downstream end of the easily breakable thin region in the narrow connection portion from the lower end thereof. An additional breaking line extending at least up to the upper side of the locking ridge can be formed, and the locking ridge formed on the inner peripheral surface of the hanging wall also has the non-breaking thickness of the narrow connection portion. It can be configured not to exist in an angle range corresponding to at least a part of the meat region. In a preferred embodiment, the apparatus includes a top wall and a cylindrical skirt wall depending from the periphery of the top wall, and an outer lid on which an internal thread is formed on the inner peripheral surface of the skirt wall, A male thread is formed on the outer peripheral surface of the reinforcing wall, and the female thread formed on the skirt wall of the outer lid is screwed onto the male thread formed on the reinforcing wall. The outer lid is attached to the lid body. The lid body includes a top wall connected to the upper end of the cylindrical hanging wall, and the top wall is provided with an opening portion defined by a breaking line, and the opening portion of the top wall is provided with the opening portion. A connecting column extending upward from the portion and a grip ring connected to the connecting column are provided, and a discharge guide tube extending upward from the outside of the opening portion is further disposed on the top wall.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a synthetic resin container lid constructed according to the present invention will be described in more detail with reference to the accompanying drawings.
[0013]
1 to 7 show an embodiment of a synthetic resin container lid constructed according to the present invention. In the figure, a synthetic resin container lid, generally indicated by reference numeral 2, comprises a lid body 4 and an outer lid 6 detachably attached to the lid body 4.
[0014]
The lid body 4 that can be integrally formed from an appropriate synthetic resin such as polypropylene or polyethylene includes a circular top wall 41, a cylindrical hanging wall 42, and a cylindrical reinforcing wall 43. The top wall 41 is formed with a break line 411 formed in a loop shape that divides the opening portion 410. This breaking line 411 can be constituted by a score formed by reducing the wall thickness. In addition, the opening part 410 divided by the fracture | rupture line 411 may be appropriate shapes, such as circular, an ellipse, or a rectangle. An opening pull ring 44 is provided on the upper surface of the opening portion 410. The pull ring 44 includes a connecting column 441 extending upward from the upper surface of the opening 410 on the inner side of the breaking line 411 and a ring portion 442 formed at the upper end of the connecting column 441. The top wall 41 is provided with a trumpet-shaped discharge guide tube 45 that protrudes upward from the outer upper surface of the breaking line 411. Further, the top wall 41 is provided with a substantially cylindrical sealing cylinder 46 that protrudes downward from the outer lower surface of the breaking line 411.
[0015]
As shown in FIG. 4, the cylindrical hanging wall 42 is formed so as to protrude downward from the periphery of the circular top surface wall 41. A locking protrusion 421 is formed on the inner peripheral surface of the cylindrical hanging wall 42 over the entire periphery.
[0016]
The cylindrical reinforcing wall 43 is disposed so as to surround the cylindrical hanging wall 42, and a male thread 431 is formed on the outer periphery thereof. In the illustrated embodiment, the lower end of the cylindrical reinforcing wall 43 is connected to the lower end of the cylindrical hanging wall 42 by a narrow connecting portion 47. The width (S) of the narrow connection portion 47 is set to 0.2 to 0.8 mm in the illustrated embodiment. The width (S) of the narrow connection portion 47 is more preferably set to 0.2 to 0.5 mm. It is important that the hanging wall 42 and the reinforcing wall 43 are separated from each other except the narrow connection portion 47. In order to separate and form the both, the lid body 4 is separated at the time of forming the lid body 4. It is necessary to dispose the annular mold part. However, the annular mold part is usually made of tempered steel, but the thickness of less than 0.2 mm is weak in strength and is not suitable for mass production in terms of durability. As a result. On the other hand, if the width (S) of the narrow connection portion 47 is set large, the annular mold part piece can be thickened and there is no problem in strength, but the gap between the hanging wall 42 and the reinforcing wall 43 becomes large. End up. If the gap between the hanging wall 42 and the reinforcing wall 43 is large, the reinforcing wall 43 cannot function when the hanging wall 42 is expanded when the lid body 4 is mounted on the mouth and neck of a container to be described later. According to the experiments by the present inventors, it has been found that if the gap between the hanging wall 42 and the reinforcing wall 43 exceeds 0.8 mm, the reinforcing function by the reinforcing wall 43 decreases rapidly. It has also been found that the reinforcing function by the reinforcing wall 43 is preferably such that the gap between the hanging wall 42 and the reinforcing wall 43 is 0.5 mm or less. In the illustrated embodiment, the gap between the outer peripheral surface of the hanging wall 42 and the inner peripheral surface of the reinforcing wall 43 is formed so as to gradually increase from below to above. This gap is preferably 0.7 to 1.3 mm at the upper end of the reinforcing wall 43. In this way, by forming the gap between the outer peripheral surface of the hanging wall 42 and the inner peripheral surface of the reinforcing wall 43 so as to gradually increase from below to above, an annular mold at the time of molding the lid body 4 The part can be easily punched out. In addition, by setting the gap to 0.7 to 1.3 mm at the upper end of the reinforcing wall 43, it becomes easy to put a finger on the upper end of the reinforcing wall 43 when breaking a break line described later. In the illustrated embodiment, the narrow connection portion 47 includes an easily breakable thin region (X) and a non-breakable thick region (Y) extending in the circumferential direction. In the illustrated embodiment, as shown in FIG. 3, the easily breakable thin region (X) is provided in an angle range of about 300 degrees, and the non-breakable thick region (Y) is an angle range of about 60 degrees. Is provided. The thickness (t1) of the narrow connection portion 47 that forms the easily breakable thin region (X) is set to about 0.2 mm, and the width of the narrow connection portion 47 that forms the non-breakable thick region (Y). The thickness (t2) is set to about 1.0 mm. Therefore, the easily breakable thin region (X) of the narrow connection portion 47 can be easily broken, but the non-breakable thick region (Y) is not broken by a normal force. In the illustrated embodiment, an example in which the narrow connection portion 47 is provided at the lower end of the reinforcing wall 43 is shown. However, the narrow connection portion 47 is formed by the locking protrusion 421 provided on the hanging wall 42. If it is the lower side, it may be an intermediate part.
[0017]
As shown in FIGS. 2 and 3, the cylindrical reinforcing wall 43 configured as described above has a position adjacent to the non-breakable thick region (Y) of the thin easily breakable region (X) from its upper end. A main break line 432 extending to the narrow connection portion 47 is formed. In the illustrated embodiment, the main break line 432 includes a score 432a formed by reducing the thickness and a notch groove 432b formed in the male thread 431. The cylindrical reinforcing wall 43 has a predetermined distance downstream from the main break line 432 when viewed in the extending direction of the easily breakable thin wall region (X), and extends from the upper end toward the narrow connection portion 47. An auxiliary breaking line 433 extending in the direction is formed. The auxiliary breaking line 433 is also constituted by a score score 433a formed by reducing the wall thickness and a notch groove 433b formed in the male thread 431. In the illustrated embodiment, the auxiliary breaking line 433 does not reach the narrow connection portion 47 as shown in FIG. In the illustrated embodiment, as shown in FIG. 2, the portion of the reinforcing wall 43 between the main break line 432 and the auxiliary break line 433 is formed to protrude upward beyond the upper end of the drooping wall 42. Gripping portion 434 is formed.
[0018]
Next, the outer lid 6 will be described with reference to FIGS. 1 and 5. The outer lid 6 that can be integrally formed from an appropriate synthetic resin such as polypropylene or polyethylene is constituted by a top wall 61 that extends substantially horizontally and a cylindrical skirt wall 62 that hangs down from the periphery of the top wall 61. Has been. A cylindrical seal wall 611 extending downward is provided on the lower surface of the top wall 61, and the outer peripheral surface of the seal wall 611 is in contact with the inner peripheral surface of the upper end portion of the discharge guide tube 45 provided in the lid body 4. Is configured to do. On the inner peripheral surface of the skirt wall 62, a female thread 621 that is screwed with a male thread 431 formed on the outer periphery of the cylindrical reinforcing wall 43 is formed.
[0019]
The synthetic resin container lid 2 configured as described above is attached to a container 8 formed of an appropriate synthetic resin such as polyethylene terephthalate or glass as shown in FIG. The container 8 includes a cylindrical mouth / neck portion 81 having a locking jaw portion 811 formed on the outer peripheral surface. The synthetic resin container lid 2 is mounted by plugging the mouth and neck portion 81 of the container 8 after contents such as liquid are stored in the container 8. By the stoppering of the synthetic resin container lid 2, the outer peripheral surface of the seal tube 46 constituting the lid body 4 is press-fitted into the inner peripheral surface of the container mouth neck portion 81, and the locking protrusion 421 of the hanging wall 42 is the container mouth neck. It is mounted by being positioned at a position over the locking jaw portion 811 formed on the outer peripheral surface of the portion 81. Although the hanging wall 42 is expanded when getting over the locking jaw portion 811, the reinforcing wall 43 is disposed outside the hanging wall 42. Therefore, the hanging wall 42 is suspended even if the wall thickness of the hanging wall 42 is reduced. The holding force of the locking protrusion 421 formed on the wall 42 can be ensured.
[0020]
As described above, the container 8 in which the contents are stored in a state where the synthetic resin container lid 2 is plugged into the mouth / neck portion 81 is transported and stored. When the contents stored in the container 8 are poured out, the upper lid 6 is rotated counterclockwise to be removed from the lid main body 4 and the pull ring 44 provided on the lid main body 4 is pulled. The line 411 is broken and the opening 410 is removed. When the opening part 410 is removed in this way, the contents can be poured out by tilting the container 8.
[0021]
Next, a procedure for separating and collecting the container 8 and the synthetic resin container lid 2 after all the contents stored in the container 8 are consumed will be described.
In order to separate the container 8 and the synthetic resin container lid 2, first, the upper lid 6 is rotated counterclockwise and removed from the lid body 4. Next, when a finger is placed on the grip portion 434 provided at the upper end of the reinforcing wall 43 of the lid body 4 and pulled outward, the main break line 432 is broken and the auxiliary break line 433 is cut as shown in FIG. It can be broken. At this time, the main break line 432 extends to the narrow connection portion 47 that connects the lower wall 42 and the lower end of the reinforcing wall 43, so that the main break line 432 is broken to the narrow connection portion 47. On the other hand, since the auxiliary breaking line 433 does not reach the narrow connection portion 47, the auxiliary breaking line 433 is broken to the middle portion of the reinforcing wall 43. Thus, if the main break line 432 and the auxiliary break line 433 are each broken as shown in FIG. 6, when the grip portion 434 is further pulled, first, the narrow connecting portion 47 below the main break line 432 is formed. Then, as shown in FIG. 7, the easily breakable thin region (X) is sequentially broken to the non-breakable thick region (Y). In this way, when the easily breakable thin wall region (X) of the narrow connection portion 47 is broken, the restraint function is lost by releasing the restraint to the hanging wall 42 by the reinforcing wall 43, so that the hanging wall 42 has a radius. It becomes possible to spread in the direction. Therefore, the lid body 4 can be easily detached from the mouth neck portion 81 of the container 8 by pulling the grip portion 434 upward.
[0022]
Next, another embodiment of a synthetic resin container lid constructed according to the present invention will be described with reference to FIGS. In the embodiment of FIGS. 8 and 9, the same members as those in the embodiment shown in FIGS. 1 to 7 are denoted by the same reference numerals, and the description thereof is omitted.
The embodiment shown in FIGS. 8 and 9 is provided at the downstream end of the easily breakable thin region (X) in the hanging wall 42, that is, at the end of the easily breakable thin region (X) opposite to the main break line 432. An additional break line 423 extending from the lower end to at least the upper side of the locking protrusion 421 is provided at the corresponding position. The additional break line 423 can be constituted by a score formed by reducing the thickness. By providing the additional breaking line 423 on the hanging wall 42 in this way, when the reinforcing wall 43 is pulled upward after breaking the easily breakable thin wall region (X) of the narrow connection portion 47 when the lid body 4 is removed, The additional breaking line 423 of the wall 42 is broken and the lid body 4 can be further easily detached from the mouth / neck portion 81 of the container 8.
[0023]
Next, still another embodiment of the synthetic resin container lid constructed according to the present invention will be described with reference to FIGS. 10 and 11, the same members as those in the embodiments shown in FIGS. 1 to 7, 8, and 9 are denoted by the same reference numerals, and the description thereof is omitted.
10 and 11, the locking protrusion 421 provided on the inner peripheral surface of the hanging wall 42 has a predetermined angle range corresponding to at least a part of the non-breaking thick region (Y). The area 425 is configured not to exist. In the illustrated embodiment, the region 425 where the locking projection 421 does not exist is the downstream end of the easily breakable thin region (X), that is, the easily breakable thin region (X ) Is provided at a position close to the end. Since the region 425 where the locking protrusion 421 does not exist is provided in a predetermined angle range corresponding to a part of the non-breaking thick region (Y) provided on the hanging wall 42 in this way, the lid body When the reinforcing wall 43 is pulled upward after breaking the easily breakable thin region (X) of the narrow connection portion 47 at the time of removing 4, the locking force of the region 425 where the locking protrusion 421 does not exist decreases. The lid body 4 can be easily detached from the mouth / neck portion 81 of the container 8.
[0024]
The preferred embodiments of the synthetic resin container lid constructed according to the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments and departs from the scope of the present invention. Various modifications or corrections can be made without any problem.
[0025]
【The invention's effect】
Since the synthetic resin container lid constructed according to the present invention is constructed as described above, the following operational effects can be obtained.
[0026]
That is, a cylindrical reinforcing wall surrounding the drooping wall is provided, and the reinforcing wall is connected to the drooping wall through a narrow connection portion having a width of 0.2 to 0.8 mm. In addition to ensuring the durability of the annular mold part for separating the hanging wall from the reinforcing wall when molding the lid body, the hanging wall expands when the lid body is attached to the mouth and neck of the container The reinforcing wall can function well when staked.
The reinforcing wall has a main break line extending from the upper end or the lower end to the narrow connection portion, and at least a part of the narrow connection portion is an easily breakable region, so the container and the synthetic resin container lid are separated. When the lid body is detached from the mouth and neck of the container by breaking the easy break region of the narrow connection portion after breaking the main break line of the reinforcing wall, the reinforcing function to the hanging wall is at least partially Therefore, the lid body can be easily detached from the mouth and neck of the container by pulling the reinforcing wall upward.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a synthetic resin container lid constructed according to the present invention, and shows a state where the synthetic resin container lid is attached to the mouth and neck of the container.
FIG. 2 is a front view of a lid body constituting the synthetic resin container lid shown in FIG.
3 is a plan view of the lid body shown in FIG. 2. FIG.
4 is a cross-sectional view taken along line AA in FIG.
5 is an exploded cross-sectional view showing a lid main body and an outer lid that constitute the synthetic resin container lid shown in FIG. 1. FIG.
6 is a front view showing a state in which a part of the reinforcing wall of the lid main body constituting the synthetic resin container lid shown in FIG. 1 is broken. FIG.
7 is a plan view showing a state in which a part of the reinforcing wall of the lid main body constituting the synthetic resin container lid shown in FIG. 1 is broken. FIG.
FIG. 8 is a bottom view of a lid body constituting a synthetic resin container lid according to another embodiment of the synthetic resin container lid constructed according to the present invention.
9 is a sectional view taken along line BB in FIG.
FIG. 10 is a bottom view of a lid body constituting a synthetic resin container lid, showing still another embodiment of the synthetic resin container lid constructed according to the present invention.
11 is a cross-sectional view taken along line CC in FIG.
[Explanation of symbols]
2: Synthetic resin container lid
4: Lid body
41: Top wall
410: opening part
411: Weak line
42: Hanging wall
421: Locking protrusion
423: Additional break line
43: Reinforcement wall
431: Male thread
432: Main break line
433: Auxiliary break line
434: gripping part
44: Pull ring
441: Connecting column
442: Ring part
45: Discharge guide tube
46: Seal tube
47: Narrow connection
61: Top wall
611: Seal wall
62: Skirt wall
621: female thread
8: Container
81: mouth and neck
811: Locking jaw

Claims (4)

The outer peripheral surface is formed with a locking jaw, and is a synthetic resin container lid applied to the cylindrical mouth and neck of the container, and has a cylindrical hanging wall, and the inner circumferential surface of the hanging wall Is formed with a locking ridge that is locked to the locking jaw portion of the mouth and neck portion, and the locking ridge is locked to the locking jaw portion, thereby A cylindrical reinforcing wall having a lid body to be mounted and surrounding the drooping wall is disposed, and the reinforcing wall is connected through a narrow connection portion having a width of 0.2 to 0.8 mm. A main break line extending from the upper end or the lower end of the reinforcement wall to the narrow connection portion is formed on the reinforcing wall, and the narrow connection portion is continuous in the circumferential direction from the tip of the main break line. An easily breakable thin-walled area that extends and a non-breakable thick-walled area that extends in the circumferential direction following this,
In the hanging wall, an additional break line extending from the lower end thereof to at least the upper side of the locking protrusion is formed at the downstream end portion of the easily breakable thin wall region in the narrow connection portion,
The lid body includes an outer lid, and the outer lid has a top wall and a cylindrical skirt wall depending from the periphery of the top wall,
A female thread is formed on the inner peripheral surface of the skirt wall, and a male thread is formed on the outer peripheral surface of the reinforcing wall of the lid body, and is formed on the skirt wall of the outer lid. The outer lid is attached to the lid body by screwing the female thread being threaded onto the male thread formed on the reinforcing wall;
In a state where the lid body is mounted on the mouth and neck,該補Tsuyokabe is lid body What the hanging under wall Hiroga radially to restrict the Ru is disengaged from the neck, the hanging lower wall To reinforce,
A container lid characterized by that. The narrow connection portion is disposed below the locking protrusion in the axial direction, connects the lower end of the reinforcing wall to the drooping wall, and the main break line extends from the upper end of the reinforcing wall. Extending to narrow connections,
The gap between the outer peripheral surface of the hanging wall and the inner peripheral surface of the reinforcing wall is gradually increased upward and is 0.7 to 1.3 mm at the upper end of the reinforcing wall. The container lid according to 1 . The reinforcing wall has an auxiliary break extending from the upper end toward the connection portion at a predetermined interval downstream from the main break line as viewed in the extending direction of the easily breakable thin region in the narrow connection portion. The container lid according to claim 2 , wherein a line is formed. Locking projections formed on the inner peripheral surface of the hanging lower wall is the width not to angular range corresponding to at least a portion of the non-broken thick region of the narrow connecting portions exist, the claims 1 to 3 The container lid according to any one of the above.

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