JP7404156B2 - Synthetic resin container lid - Google Patents

Description

The present invention is applied to a container in which a male thread and a locking jaw portion located below the male thread are formed on the outer peripheral surface of the mouth and neck, and even after the mouth and neck of the container are opened. The present invention relates to a synthetic resin container lid with tamper-evident properties that prevents the entire container lid from being separated from the mouth and neck of the container.

Patent Documents 1 to 3 below describe synthetic resin container lids that are applied to containers in which a male thread and a locking jaw located below the male thread are formed on the outer peripheral surface of the mouth and neck. , a main body having a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, and a female thread formed on the inner peripheral surface of the skirt wall to be screwed into a male thread of the mouth and neck part; , connected to the skirt wall of the main body via a plurality of broken bridges arranged at intervals in the circumferential direction, and having locking means on the inner circumferential surface that is locked to the locking jaw. A synthetic resin container lid is disclosed that includes a cylindrical tamper-evident hem. The locking means includes a plurality of locking pieces disposed at intervals in the circumferential direction and extending upward and radially inward from the base end connected to the tamper-evident hem, or continuous in the circumferential direction. It consists of one locking piece extending upwardly and radially inwardly from the proximal end connected to the tamper-evident hem. Further, the skirt wall of the main body is provided with a protruding piece that protrudes downward, and one or both sides of the protruding piece in the circumferential direction connects the skirt wall of the main body and the tamper-evident hem. A non-breakable connection piece is provided that allows upward movement of the body relative to the hem.

When attaching the container lid as described above to the mouth and neck of the container to seal the mouth and neck, fit the container lid onto the mouth and neck, rotate it in the closing direction, and tighten the female thread on the container lid. Screw it onto the male thread on the mouth and neck. As the screwing progresses, the container lid is lowered relative to the mouth and neck, and the locking means formed on the tamper-evident hem elastically overcomes the locking jaws of the mouth and neck and moves downwards. be positioned. When opening the mouth and neck, the container lid is rotated in the opening direction to release the threaded engagement between the male thread on the mouth and neck and the female thread on the container lid. When the screw is released, the main body of the container lid is raised relative to the mouth and neck, but the tamper-evident hem is prevented from rising by the locking means engaging the locking jaws of the mouth and neck. Therefore, stress is generated in the broken bridge and the broken bridge is ruptured. When the main body continues to rise after the broken bridging part is broken and is separated upward from the tamper-evident hem, the non-breakable connection piece is deformed accordingly, but the non-breakable connection piece breaks. The tamper-evident hem continues to be attached to the mouth and neck without being removed, and even after the main body is separated from the mouth and neck, the main body continues to be connected to the tamper-evident hem via the non-breakable connection piece, Therefore, it is not separated from the mouth and neck of the container. After the main body of the container lid is separated from the mouth and neck, the main body of the container lid is pivoted in a direction away from the mouth and neck about a predetermined portion of the non-breakable connecting piece. When the main body of the container lid is turned beyond a predetermined angle, the tip of the protruding piece formed on the skirt wall elastically climbs over the locking jaw of the mouth and neck, and the upper surface of the locking jaw. located laterally, thereby preventing the body from moving back toward the mouth and neck, and retaining the body in a position away from the mouth and neck to maintain the mouth and neck in an unsealed condition. When the tip of the protruding piece elastically passes over the locking jaw, a sound is generated due to the protruding piece being elastically deformed and then elastically restored, which causes the consumer to close the container lid. It can be recognized that the main body of has been swung to the required open position.

Japanese Patent Application Publication No. 2010-18290 Japanese Patent Application Publication No. 2012-76771 Japanese Patent Application Publication No. 2014-31202

Therefore, in light of the recent demand for lighter packaging containers from the viewpoint of environmental issues and material cost reduction, and for container lids as well, there is a need for thinner walls and reduced axial dimensions. Experience has shown that conventional container closures as described above have a relatively short axial length, especially in the mouth and neck region, and correspondingly a relatively short axial dimension of the container closure (i.e. a vertical height). (relatively low), in order to unseal the mouth and neck, the main body detached from the mouth and neck is turned in a direction away from the mouth and neck, thereby causing the tip of the protruding piece to engage the locking jaws of the mouth and neck. When the protruding piece elastically moves over the locking jaw and is located above the locking jaw, the length of the protruding piece becomes relatively short due to the relatively short axial dimension of the container lid. The amount of mutual interference between the protruding piece and the locking jaw becomes too small, and (1) the tip of the protruding piece accidentally comes into contact with the locking jaw once the tip of the protruding piece is above the locking jaw. (2) When the protruding piece elastically overcomes the locking jaw, the sound generated is insufficient and the consumer is unable to keep the main body in the required open position. It has been found that there is a problem that needs to be solved in that it is often not possible to recognize that the vehicle has been turned to a certain position.

In order to solve the above problems, the present inventors previously proposed in the specification of Japanese Patent Application No. 2019-025644 that an extending portion extending upward is formed on the locking piece at least in the angular region where the protruding piece is present. The extending part formed in the angular region where the protruding piece is located is located between the locking jaw part of the mouth and neck part and the protruding piece when the synthetic resin container lid is attached to the mouth and neck part. We proposed a synthetic resin container lid. According to this synthetic resin container lid, when the main body detached from the mouth and neck is turned in a direction away from the mouth and neck, the tip of the protruding piece along with the locking jaw of the mouth and neck will be rotated along its radius. The protruding piece elastically rides over the extending portion located on the outside in the direction, and the tip of the protruding piece is interfered with by the extending portion. Therefore, it is possible to prevent the tip of the protruding piece from accidentally returning to the underside of the locking jaw after the tip of the protruding piece is once placed above the locking jaw.

However, it has been found that the synthetic resin container lid previously proposed by the present inventors is still not fully satisfactory, and the following problems remain. In other words, when a plurality of broken bridging parts are broken, the tamper-evident hem slightly descends relative to the mouth and neck, so the main body is If the extension is repeatedly rotated with respect to the mouth and neck, there is a risk that the extension may accidentally slip under the locking jaw, and the extension may If it gets under the locking jaw, problem (1) above will not be solved. In order to prevent this, it may be possible to increase the amount of upward extension of the extension, but if the amount of extension is excessive, the tip of the protrusion piece may interfere with the extension. There is a risk that the main body will not be able to turn from the required open position in a direction that approaches the mouth and neck.

The present invention has been made in view of the above facts, and its main technical problem is to further improve the synthetic resin container lid previously proposed by the present inventors, so that a plurality of broken bridges can be removed. Even if the main body is repeatedly rotated with respect to the mouth and neck in a broken state, the locking piece in the angular region where the protruding piece is present is prevented from slipping into the underside of the locking jaw of the mouth and neck. Another object of the present invention is to prevent the distal end of the projecting piece from interfering with the locking piece and becoming unable to turn when the main body is turned from a required open position in a direction approaching the mouth and neck.

As a result of extensive studies, the present inventors formed an upwardly extending extension part on the locking piece in the angular region where the protruding piece exists, and the extended extension part has a plurality of broken bridge parts. located between the locking jaw of the mouth and neck part and the protruding piece in the broken state and extending upwardly beyond the locking jaw, and extending beyond the locking jaw of the extended extension part; It has been found that the above-mentioned main technical problem can be solved by sloping at least the outer surface of the upwardly extending portion upwardly and radially inwardly.

That is, according to the present invention, as a container lid that achieves the above-mentioned main technical problem, a male thread and a locking jaw portion located below the male thread are formed on the outer circumferential surface of the mouth and neck. A synthetic resin container lid applied to a container, which has a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, and has a male thread screwed onto the inner peripheral surface of the skirt wall. The main body is connected to the skirt wall of the main body through a plurality of broken bridges arranged at intervals in the circumferential direction, and the inner circumferential surface is connected to the skirt wall. a cylindrical tamper-evident hem portion provided with locking means to be locked to the stop jaw, the locking means being spaced apart in the circumferential direction, and the tamper-evident hem portion a plurality of locking pieces extending upward and radially inward from the proximal end connected to the tamper-evident hem; or upward and radial from the proximal end extending continuously in the circumferential direction and connected to the tamper-evident hem; The skirt wall of the main body is provided with a protruding piece that projects downward, and the skirt wall of the main body and the tamper shrimp are further connected to each other. A synthetic resin container lid is provided with a non-breakable connecting piece that connects to the dent hem and allows upward movement of the main body with respect to the tamper-evident hem,
The locking piece in the angular region where the projecting piece exists is located between the locking jaw part of the mouth and neck part and the projecting piece when the plurality of broken bridging parts are broken. and an extending appendage extending upwardly beyond the locking jaw, and at least an outer surface of a portion of the extending appendage extending upwardly beyond the locking jaw has an upward radius. A synthetic resin container lid is provided, which is characterized in that it is inclined inward.

Preferably, the inner surface of the portion of the extension appendage extending upwardly beyond the locking jaw is sloped radially inwardly toward the top. In this case, the inner surface of the portion of the extended extension extending upwardly beyond the locking jaw preferably extends along the upper surface of the locking jaw. An extending portion extending upward is formed at the tip of the locking piece at least in the angular region where the protruding piece exists, and the extending portion is formed in the angular region where the protruding piece exists. Preferably, it is formed at the tip of the extension. Preferably, the inner surface of the locking piece is formed with a locking protrusion that projects radially inward below the locking jaw when the synthetic resin container lid is attached to the mouth and neck. ing.

In the container lid of the present invention, an extending additional portion is formed on the locking piece in the angular region where the protruding piece is present, and the extending additional portion has an opening when the plurality of broken bridging portions are broken. Since it is located between the locking jaw part of the neck and the protruding piece and extends upward beyond the locking jaw part, the main body is in the state where the plurality of broken bridging parts are broken. Even if the locking piece is repeatedly rotated against the locking jaw, the locking piece in the angular region where the protruding piece is present is prevented from slipping under the locking jaw. This will more reliably prevent the tip of the protruding piece from accidentally returning to the lower side of the locking jaw after being placed on the upper side. Further, in the container lid of the present invention, at least the outer surface of the portion of the extension portion extending upwardly beyond the locking jaw portion is inclined upwardly and radially inwardly. This prevents the distal end of the projecting piece from interfering with the locking piece and making it impossible to turn when the main body is turned from the required open position in a direction approaching the mouth and neck.

1 is a front view of a preferred embodiment of a constructed container lid constructed in accordance with the present invention; FIG. FIG. 2 is a front view showing a part of the container lid shown in FIG. 1 in cross section. FIG. 2 is a bottom view of the container lid shown in FIG. 1; FIG. 2 is a right side view, partially in cross section, of the container lid shown in FIG. 1 attached to the mouth and neck of the container. FIG. 2 is a front view showing an intermediate state of the opening operation in which the main body of the container lid of FIG. 1 is rotated in the opening direction and raised in order to separate from the mouth and neck of the container. FIG. 2 is a partially cutaway side view showing a state in which the main body of the container lid of FIG. 1 is detached from the mouth and neck and then rotated somewhat in a direction away from the mouth and neck. FIG. 2 is a partially cutaway side view showing a state in which the main body of the container lid of FIG. 1 is separated from the mouth and neck of the container and then rotated to a predetermined open position in a direction away from the mouth and neck. An enlarged view of the vicinity of the protruding piece in FIG. 7.

Hereinafter, preferred embodiments of the synthetic resin container lid constructed according to the present invention will be described in further detail with reference to the accompanying drawings.

1-3, which illustrate a preferred embodiment of a synthetic resin container closure constructed in accordance with the present invention, it can be conveniently manufactured by injection molding or compression molding from a suitable synthetic resin such as polyethylene or polypropylene. The container lid, generally designated 2, which may be molded in one piece, includes a body 4 and a tamper-evident skirt 6. The main body 4 has a circular top wall 8 and a cylindrical skirt wall 10 that hangs down from the periphery of the top wall 8. Two seal protrusions, namely an inner annular protrusion 12 and an outer annular protrusion 14, are formed on the inner surface of the top wall 8. The outer circumferential surface of the skirt wall 10 is repeatedly formed with unevenness 16 to prevent fingers placed thereon from slipping. A female thread 18 is formed on the inner peripheral surface of the skirt wall 10. Notches 20 are formed in this female thread 18 at intervals in the circumferential direction. The tamper-evident hem 6 has a generally cylindrical shape and is connected to the skirt wall 10 of the main body 4 via a breakable bridge and a pair of non-breakable connecting pieces, which will be described later. A locking means 22 is provided on the inner peripheral surface of the tamper-evident hem 6. In the illustrated embodiment, the locking means 22 includes nine arcuate locking pieces 24a to 24i formed at intervals in the circumferential direction. Each of the arcuate locking pieces 24a to 24i extends upward in the axial direction and inward in the radial direction from a base end connected to the inner circumferential surface of the tamper-evident hem 6. In the illustrated embodiment, the locking means 22 is composed of nine arcuate locking pieces 24a to 24i arranged at intervals in the circumferential direction, but if desired, the locking means 22 may extend continuously in the circumferential direction. The locking means 22 can also be constituted by an annular locking piece extending axially upward and radially inward from the base end connected to the inner circumferential surface of the tamper-evident hem 6.

A rectangular extending portion 26 extending upward is formed on both sides in the circumferential direction of the tip of each of the locking pieces 24a to 24i. As will be clearly understood by referring to FIG. 8 in conjunction with FIGS. 2 and 3, the radially outer surface of each of the extensions 26 projects progressively radially outwardly in an upward direction; Retracted radially inward. Furthermore, the portion 26a that gradually protrudes outward in the radial direction toward the top is arc-shaped in a longitudinal cross-sectional view (hereinafter referred to as the arc-shaped portion 26a), and the portion 26b that gradually retreats inward in the radial direction toward the top is It is linear in a longitudinal cross-sectional view (hereinafter referred to as a linear portion 26b). The radially inner surface of each of the extensions 26 is a flat surface. A locking protrusion 28 that projects radially inward is formed on the radially inner surface of the main portion of each of the locking pieces 24a to 24i, that is, at a portion other than the extension portion 26. The protrusion amount of the locking protrusion 28 gradually increases upward, and the upper surface thereof extends substantially horizontally. Each of the locking protrusions 28 is formed in the circumferential center of each of the locking pieces 24a to 24i, that is, in a portion where the extending portion 26 does not exist. If desired, the locking protrusion 28 can be formed over the entire circumferential direction of each of the locking pieces 24a to 24i. Each of the locking pieces 24a and 24i has an extending portion 50 on one side (the left side in FIG. 3 for the locking piece 24a and the right side in FIG. 3 for the locking piece 24i). It is formed. The extended extension portion 50 will be mentioned later.

Continuing the explanation with reference to FIGS. 1 to 3, in a specific area indicated by numeral 30, the lower edge of the skirt wall 10 of the main body 4 is displaced upwardly than the lower edge of other areas, and is also tampered with. The upper edge of the evident hem 6 is displaced lower than the upper edges of other regions, and an opening 32 that extends horizontally in the front view is created between the skirt wall 10 and the tamper evident hem 6. has been done. At the circumferential center of the opening 32, the skirt wall 10 is formed with a substantially rectangular projecting piece 34 that projects downward from its lower end. As can be clearly seen by referring to FIG. 8 in conjunction with FIG. 1, the protruding pieces 34 depend substantially vertically. Corresponding to the protruding piece 34, the tamper-evident hem 6 is formed with an upwardly open notch 36 that receives the protruding end of the protruding piece 34.

As clearly shown in FIG. 1, in the specific region 30, a pair of unbreakable connecting pieces 38a and 38b are provided adjacent to the protruding piece 34 on both sides in the circumferential direction. The unbreakable connecting piece 38a in the illustrated embodiment includes an upper end 40a connected to the lower edge of the skirt wall 10, and a first extending substantially horizontally to one side in the circumferential direction (right side in FIG. 1) following the upper end 40a. The tilting part 42a, the intermediate part 44a, and the intermediate part 44a extend below the first tilting part 42a substantially horizontally to the other side in the circumferential direction (the left side in FIG. 1) and are connected to the tamper-evident hem 6. It is composed of a second tilting section 46a. The non-breakable connection piece 38b also has an upper end portion 40b connected to the lower edge of the skirt wall 10, and a first tilting portion 42b that extends substantially horizontally to the other side in the circumferential direction (the left side in FIG. 1) following the upper end portion 40b. , an intermediate part 44b, and a second part which, following the intermediate part 44b, extends substantially horizontally below the first tilting part 42b in the circumferential direction (on the right side in FIG. 1) and is connected to the tamper-evident hem part 6. It is composed of a tilting portion 46b. If desired, the first tilting portion 42a and the second tilting portion 46a of the non-breakable connecting piece 38a and the first tilting portion 42b and the second tilting portion 46b of the non-breaking connecting piece 38b may be arranged in a predetermined position rather than substantially horizontally. It can also be tilted in the direction. As can be clearly understood by referring to FIG. 1, the non-breakable connection piece 38a and the non-breakable connection piece 38b are not line symmetrical, and the circumferential dimensions of the components are somewhat different (the reason for this is explained below). Please refer to the description in Patent Document 2 above).

In the specific area indicated by numeral 30, that is, in areas other than the area where the protruding piece 34 and the pair of non-breakable connection pieces 38a and 38b are present, there is a breakable bridge connecting the tamper-evident hem 6 to the lower end of the skirt wall 10 of the main body 4. A plurality of connecting portions 48 are arranged at intervals in the circumferential direction. In the illustrated embodiment, a plurality of narrow protrusions extending in the axial direction across the inner surface of the skirt wall 10 and the inner surface of the tamper-evident hem 6 are formed at intervals in the circumferential direction. A portion of the protrusion located between the skirt wall 10 and the tamper-evident hem 6 constitutes a fracture bridging portion 48 (see FIG. 2). If desired, also in the area where the pair of non-breakable connecting pieces 38a and 38b are present, for example between the first tilting parts 42a and 42b and the skirt wall 10 or between the second tilting parts 46a and 46b and the tamper-evident hem. 6 or between the protruding piece 34 and the tamper-evident hem 6.

In the container lid 2 constructed in accordance with the present invention, it is important that the locking pieces 24a and 24i in the angular region where the protruding piece 34 is present are provided with an upwardly extending extension portion 50. As shown in FIGS. 3 and 4, in the illustrated embodiment, the extended extension portion 50 is a rectangular piece, and one side of the extension portion 26 of the locking pieces 24a and 24i (locking piece 24a extends upward from the tip of the left extending portion 26 in FIG. 3, and the locking piece 24i extends upward from the tip of the right extending portion 26 in FIG. Therefore, two extending additional portions 50 are arranged adjacent to each other in the circumferential direction. As shown in FIGS. 4 and 8, the extending portion 50 extends slightly upward in a straight line from the tip of the extending portion 26, and then inclines inward in the radial direction and extends linearly.

FIG. 4 also shows the container lid 2 as well as the mouth and neck 52 of the container. The mouth and neck portion 52 of the container, which can be formed from a suitable synthetic resin such as polyethylene terephthalate or glass, is generally cylindrical in shape and has an open top surface. A male thread 54 and a locking jaw portion 56 located below the male thread 54 are formed on the outer peripheral surface of the mouth and neck portion 52 .

When attaching the container lid 2 to the mouth and neck part 52 to seal the mouth and neck part 52, the container lid 2 is fitted onto the mouth and neck part 52 and moved in the closing direction (clockwise when viewed from above in FIG. 4). Rotate it so that the female thread 18 of the container lid 2 is screwed into the male thread 54 of the mouth and neck part 52. As the female thread 18 is screwed into the male thread 54, the container lid 2 gradually descends relative to the mouth and neck portion 52. When the container lid 2 is lowered relative to the mouth and neck part 52 to the state shown in FIG. 14 are brought into close contact with the inner and outer circumferential surfaces of the mouth and neck portion 52, respectively, thereby sealing the mouth and neck portion 52. The main portion of each of the locking pieces 24a to 24i provided on the inner peripheral surface of the tamper-evident hem 6 of the container lid 2, that is, the portion other than the extension portion 26 (and the extension addition portion 50) is made of elastic material. The upper surface of the locking protrusion 28 formed on the radially inner surface is positioned below the locking jaw 56 of the mouth and neck portion 52 due to the deformation. do. One side of the extending portion 26 of each of the locking pieces 24a and 24i (the left side in FIG. 3 for the locking piece 24a and the right side in FIG. 3 for the locking piece 24i) is connected to the protruding piece 34 and the opening. It is located between the locking jaw portion 56 of the neck portion 52 and between the inner surface of the protruding piece 34 and the outer peripheral surface of the locking jaw portion 56. On the other hand, among the extending portions 26 of each of the locking pieces 24a to 24i, one side of the extending portion 26 of each of the locking pieces 24a and 24i described above (for the locking piece 24a, the left side in FIG. In the stopper piece 24i, the extending portion 26 excluding the right side in FIG. It is located between the inner circumferential surface and the outer circumferential surface of the locking jaw portion 56.

When opening the neck part 52, the container lid 2 is rotated in the opening direction (counterclockwise when viewed from above in FIG. 4), and the female thread of the container lid 2 is aligned with the male thread 54 of the mouth neck part 52. 18 is gradually released. When the screws are gradually released, the main body 4 of the container lid 2 is rotated in the opening direction and raised. is locked against the lower surface of the locking jaw 56 and prevented from rising, which generates considerable stress on the break bridge 48, causing the break bridge 48 to break and cause the tamper-evident hem to rupture. 6 is slightly lower.

Thereafter, the main body 4 of the container lid 2 rises as it rotates in the opening direction, and is gradually separated upward from the tamper-evident hem 6. As will be clearly understood by comparing and referring to FIG. 1 and FIG. The second tilting portion 46b of the unbreakable connecting piece 38b is pivoted clockwise in FIGS. 1 and 5 about the lower ends of the intermediate portion 44a and the second tilting portion 46b, respectively, while being tilted clockwise. The second tilting portion 46a of the breakable connecting piece 38a and the first tilting portion 42b of the non-breakable connecting piece 38b pivot counterclockwise in FIGS. 1 and 5 about their respective lower ends and intermediate portions 44b, i.e. Correspondingly, the angle of inclination of the first tilting portions 42a and 42b and the second tilting portions 46a and 46b of the non-breakable connecting pieces 38a and 38b with respect to the vertical line is gradually reduced. When the female thread 18 of the container lid 2 is completely unthreaded from the male thread 54 of the mouth and neck portion 52, the main body 4 of the container lid 2 is removed from the mouth and neck portion 52. However, the main body 4 remains connected to the tamper-evident skirt 6, which continues to be attached to the mouth and neck 52, via the non-breakable connecting pieces 38a and 38b, and is therefore spaced apart from the mouth and neck 52 of the container. Never.

After the main body 4 of the container lid 2 is separated from the mouth and neck part 52, the main body 4 is moved in a direction away from the mouth and neck part 52 (in FIG. (clockwise). At this time, as shown in FIG. 6, the projecting piece 34 has its extending end on one side of the locking pieces 24a and 24i (the left side in FIG. 3 for the locking piece 24a, and the left side in FIG. 3 for the locking piece 24i). The right side) is elastically deformed and rises along the outer surface of the locking pieces 24a and 24i, and then one side of the extending portion 26 of the locking pieces 24a and 24i (on the locking piece 24a) In FIG. 3, the left extension 26 and the locking piece 24i rise along an arcuate portion 26a on the outer surface of the right extension 26 in FIG. After that, the protruding piece 34 climbs over the arcuate portion 26a of the extending portion 26, and as shown in FIGS. The extension portion 50 is brought into contact with the extension portion 50 . The body 4 of the container lid 2 is thus securely held in the open position shown in FIGS. 7 and 8. Moreover, when the protruding piece 34 overcomes the arcuate portion 26a of the extending portion 26 and is elastically restored, a sound is generated.

When eating or drinking the contents is interrupted midway, the main body 4 held in the position shown in FIG. 7 is forcibly moved in the direction approaching the mouth and neck 52 (counterclockwise in FIGS. It is rotated and fitted into the mouth and neck part 52 again. In this case, in the container lid 2 constructed according to the present invention, at least the outer surface of the portion of the extension extension 50 that extends upward beyond the locking jaw 56 is inclined upwardly and radially inward. Due to this, when the main body 4 is turned from the required open position in a direction approaching the mouth and neck part 52, the tip of the protruding piece 34 interferes with the locking pieces 24a and 24i, making it impossible to turn. This is avoided. Then, the container lid 2 is rotated in the closing direction, and the female thread 18 of the container lid 2 is screwed into the male thread 54 of the mouth and neck part 52, and the container lid 2 is thus positioned again in the state shown in FIG. 4. The mouth and neck region 52 can be temporarily sealed.

In the container lid 2 constructed in accordance with the present invention, an extended additional portion 50 is formed on the locking pieces 24a and 24i in the angular region where the protruding piece 34 is present, and the extended additional portion 50 has a plurality of broken parts. Since the bridging portion 48 is located between the locking jaw portion 56 of the mouth and neck portion 52 and the protruding piece 34 in the broken state and extends upward beyond the locking jaw portion 56, a plurality of Even if the main body 4 is repeatedly rotated with respect to the mouth and neck part 52 with the broken bridging part 48 broken, the locking pieces 24a and 24i in the angular region where the protruding piece 34 exists will not hold the locking jaw part 56. This prevents the tip of the protruding piece 34 from slipping under the locking jaw 56. Therefore, if the tip of the protruding piece 34 accidentally falls under the locking jaw 56 after the tip of the protruding piece 34 is on the upper side of the locking jaw 56. This will more reliably prevent it from returning. In the illustrated embodiment, the inner surface of the portion of the extension extension 50 that extends upwardly beyond the locking jaw 56 is directed upwardly and radially inwardly, and more particularly, the upper surface of the locking jaw 56. Since the inner surface contacts the locking jaw 56, the locking pieces 24a and 24i are more reliably prevented from slipping under the locking jaw 56.

Although the preferred embodiments of the container lid constructed according to the present invention have been described above in detail with reference to the accompanying drawings, the present invention is not limited to such embodiments and does not depart from the scope of the present invention. Needless to say, various modifications and modifications are possible. For example, in the illustrated embodiment, the protruding piece 34 is composed of a single piece, but it can also be composed of a plurality of pieces, or from the protruding end (lower end) to the proximal end (upper end) of a single piece. ) can also be divided into several parts by forming one or more slits extending towards them. In the illustrated embodiment, two unbreakable connection pieces 38a and 38b are provided on both sides of the protruding piece 34 in the circumferential direction, but one or more breakable connection pieces 38a and 38b are provided. It is also possible to set

2: Container lid 4: Main body 6: Tamper-evident hem 8: Top wall 10: Skirt wall 18: Female thread 22: Locking means 24a to 24i: Locking piece 26: Extending portion 34: Projecting piece 38a: Non-breakable connecting piece 38b: Non-breakable connecting piece 48: Breakable bridging part 50: Extension addition part 52: Mouth and neck part 54: Male thread 56: Locking jaw part

Claims (5)

A container lid made of synthetic resin that is applied to a container in which a male thread and a locking jaw portion located below the male thread are formed on the outer peripheral surface of the mouth and neck, a main body having a cylindrical skirt wall hanging down from the periphery of the main body, and a main body having a female thread formed on the inner circumferential surface of the skirt wall to be screwed into the male thread; a cylindrical tamper connected to the skirt wall of the main body via a plurality of broken bridges provided therein, and having locking means for locking to the locking jaws on the inner peripheral surface; an evident hem, the locking means having a plurality of circumferentially spaced and extending upwardly and radially inwardly from a proximal end connected to the tamper evident hem. A locking piece or an annular locking piece that extends continuously in the circumferential direction and extends upward and radially inward from the base end connected to the tamper-evident hem, and the body A projecting piece is disposed on the skirt wall of the main body and extends downwardly, and further connects the skirt wall of the main body with the tamper-evident hem and extends upwardly of the main body with respect to the tamper-evident hem. In a synthetic resin container lid equipped with a non-breakable connection piece that allows movement of the container,
The locking piece in the angular region where the protruding piece exists is located between the locking jaw part of the mouth and neck part and the protruding piece when the plurality of broken bridging parts are broken. and an extending extension extending upwardly beyond the locking jaw, and at least an outer surface of a portion of the extending extension extending upwardly beyond the locking jaw has an upward radius. A synthetic resin container lid characterized by being inclined inward. 2. The synthetic resin container lid according to claim 1, wherein the inner surface of the portion of the extension extending upwardly beyond the locking jaw is inclined upwardly and radially inward. 3. The synthetic resin container lid according to claim 2, wherein the inner surface of the portion of the extension extending upwardly beyond the locking jaw extends along the upper surface of the locking jaw. An extending portion extending upward is formed at the tip of the locking piece at least in the angular region where the protruding piece exists, and the extending portion is formed in the angular region where the protruding piece exists. The synthetic resin container lid according to any one of claims 1 to 3, which is formed at the tip of the extending portion. A locking protrusion is formed on the inner surface of the locking piece and projects radially inward below the locking jaw when the synthetic resin container lid is attached to the mouth and neck. The synthetic resin container lid according to any one of items 1 to 4.