JP6998737B2 - Synthetic resin container lid - Google Patents

Description

The present invention has a tamper evidence property of a type in which the entire container lid is not separated from the container even after the mouth and neck of the container is opened, unless a particularly compulsory operation is applied. Via a synthetic resin container lid, more specifically a body having a top wall and a tubular skirt wall hanging from the periphery of the top wall, and a plurality of breakable bridges disposed at circumferential intervals. Including the tamper evidence hem connected to the main body, even if the bridge entanglement is broken and the main body is separated from the mouth and neck of the container, the tamper evidence hem that continues to be attached to the mouth and neck of the container is not included. The present invention relates to a type of synthetic resin container lid in which the main body is continuously connected via a broken connection piece.

As a synthetic resin container lid with tamper-evidence characteristics, which is applied to containers in which a male screw and a locking chin located below the male screw are formed on the outer peripheral surface of the mouth and neck. According to Patent Documents 1 and 2 below, the entire container lid is not separated from the container even after the mouth and neck of the container is opened, unless a forced operation is applied. Is disclosed. Such a container lid is a main body having a top wall and a cylindrical skirt wall hanging from the peripheral edge of the top wall, and a skirt of the main body via a plurality of breakable bridges arranged at intervals in the circumferential direction. Includes a tubular tamper evidence hem connected to the wall. On the inner peripheral surface of the skirt wall, a female screw thread that is screwed into a male thread on the mouth and neck of the container is formed. A protruding piece protruding downward is arranged on the skirt wall of the main body, and non-breaking connecting pieces connecting the skirt wall of the main body and the tamper evidence hem are arranged on both sides of the protruding piece in the circumferential direction. Has been done. The one-sided non-breaking connecting piece located clockwise from the protruding piece when viewed from above extends from the base end connected to the tamper-evidence hem toward the protruding piece and with respect to the tamper-evidence hem. The other side non-breaking connection piece located on the counterclockwise side of the protruding piece when viewed from above, including the counterclockwise tilting part that is tilted counterclockwise when the main body is moved upward, is the tamper evidence hem. It includes a clockwise tilting portion that extends from the base end connected to the portion toward the projecting piece and is tilted clockwise when the main body is moved upward with respect to the tamper evidence hem.

Japanese Patent No. 5341729 Japanese Patent No. 5520768

The container lid of the above-mentioned type allows the mouth and neck of the container to be swallowed without holding the body with one hand after opening the mouth and neck of the container, and also to prevent the body from falling and being lost. Even after opening the container once, the main body remains connected to the hem of the tamper evidence via the non-breakable connecting piece, and the contents of the container are consumed or the mouth and neck are temporarily closed and reopened by the main body. It is intended to be carried out. However, according to the experience of the present inventors, in a normal container lid, the main body separated from the mouth and neck is completely separated from the tamper evidence hem, so that the container lid is of the above-mentioned type. Nevertheless, in rare cases, the non-breaking connection piece was broken by applying excessive force to the main body that was mistakenly or intentionally separated from the mouth and neck, and the main body was completely removed from the tamper evidence hem. May separate into. When such a situation occurs, a part of the broken non-breaking connection piece is separated from the tamper evidence hem together with the main body, but the rest of the broken non-breaking connection piece is the tamper evidence hem. It remains on the hem of the tamper evidence in a state of extending from the upper edge. When the consumer touches the lips to the mouth and neck of the container for consumption of the contents in such a state, the rest of the non-breaking connection pieces remaining at the hem of the tamper evidence sticks to the consumer's lips. , Consumers may feel uncomfortable or damage their lips.

The present invention has been made in view of the above facts, and its main technical problem is that even if an excessive force is applied to the main body detached from the mouth and neck and the non-breaking connecting piece is broken, the tamper is used. Evidence A new and improved synthetic resin that minimizes consumer discomfort or damage to the lips due to the remnants of the non-breaking splinters remaining in the hem. To provide a container lid.

As a result of diligent studies and experiments, the present inventors have created an induced forced break region by forming a notch extending downward from the upper edge in the vicinity of the proximal end connected to the tamper evidence hem in the non-break connection piece. It has been found that the arrangement can solve the above-mentioned main technical problems.

That is, according to the present invention, as a synthetic resin container lid that solves the above-mentioned main technical problem,
A synthetic resin container lid applied to a container in which a male screw and a locking jaw located below the male screw are formed on the outer peripheral surface of the mouth and neck.
A main body having a top wall and a tubular skirt wall hanging from the peripheral edge of the top wall, and a female screw thread screwed to the male thread is formed on the inner peripheral surface of the tubular skirt wall. It is connected to the tubular skirt wall of the main body via a plurality of breakable bridges arranged at intervals in the circumferential direction, and is locked to the locking jaw on the inner peripheral surface. Includes a tubular tamper evidence hem and is provided with stopping means
The tubular skirt wall of the main body is disposed with protruding pieces protruding downward, and the tubular skirt wall of the main body and the tubular tamper evidence hem are provided on both sides of the protruding pieces in the circumferential direction. A non-breaking connection piece is arranged to connect with
The one-sided non-breaking connecting piece located clockwise from the protruding piece when viewed from above extends from the base end connected to the tubular tamper evidence hem toward the protruding piece and has a tubular shape. Includes a counterclockwise tilting portion that tilts counterclockwise when viewed from the front when the body is moved upward with respect to the tamper evidence hem.
The other side non-breaking connecting piece located counterclockwise with respect to the protruding piece when viewed from above extends from the base end connected to the tubular tamper evidence hem toward the protruding piece. Includes a clockwise tilting portion that tilts clockwise when viewed from the front when the body is moved upward with respect to the tubular tamper evidence hem.
In the synthetic resin container lid
In the vicinity of the base end of the counterclockwise tilting portion of the one-sided non-breaking connection piece and in the vicinity of the base end of the clockwise tilting portion of the other side non-breaking connecting piece, respectively , above the counterclockwise tilting portion. An induced forced break region is disposed by forming a notch extending downward from the edge and the upper edge of the clockwise tilting portion .
A synthetic resin container lid characterized by this is provided.

The upper end edge of the notch in the counterclockwise tilting portion on the clockwise side when viewed from above is a convex arc shape extending smoothly, and the notch in the clockwise tilting portion is on the counterclockwise side when viewed from above. It is desirable that the upper end edge has a convex arc shape that extends smoothly. The cross-sectional area of the induced forced fracture region of the one-sided non-breaking connecting piece and the cross-sectional area of the induced forced breaking region of the other-side non-breaking connecting piece are preferably 0.5 to 0.6 mm ² . The one-sided non-breaking connecting piece extends above the counterclockwise tilting portion from the base end connected to the skirt wall toward the protruding piece, and the main body is upward with respect to the tamper evidence hem. Including a clockwise tilting portion that is tilted clockwise when moved to, the other side non-breaking connecting piece is above the clockwise tilting portion from a proximal end connected to the skirt wall toward the projecting piece. It is convenient to include a counterclockwise tilting portion that extends counterclockwise and is tilted counterclockwise when the body is moved upward with respect to the tamper evidence hem.

In the synthetic resin container lid of the present invention, when an excessive force is applied to the main body separated from the mouth and neck, one side non-breaking connection piece and the other side non-breaking connection piece are arranged near the proximal end, respectively. It is forcibly broken in the induced forced rupture region. Therefore, the rest of the one-sided non-breaking connection piece and the other-side non-breaking connection piece remaining in the tamper-evidence hem is sufficiently small, and the one-sided non-breaking connection piece and the other-side non-breaking connection piece remaining in the tamper-evidence hem The remnants avoid discomfort or damage to the lips as much as possible.

The front view which shows the preferable embodiment of the synthetic resin container lid configured according to this invention. The front view which shows the state in which the container lid illustrated in FIG. 1 is attached to the mouth neck part of a container, and the mouth neck part is sealed, partly shown in the cross section. From the state shown in FIG. 2, a front view showing a state in which the container lid is slightly rotated in the opening direction in order to open the mouth and neck. FIG. 3 is a front view showing a state in which the container lid is further rotated in the opening rotation direction from the state shown in FIG. 3, the main body of the container lid is separated from the mouth and neck of the container, and the main body is further swiveled. FIG. 4 is a front view showing a tamper-evidence hem after forcibly breaking one side non-breaking connection piece and the other side non-breaking connection piece by applying an excessive force to the main body in the state shown in FIG. 4. A front view similar to FIG. 5 in the case of a conventional synthetic resin container.

Hereinafter, the description will be made in more detail with reference to the accompanying drawings illustrating a preferred embodiment of the synthetic resin container lid configured according to the present invention.

Explaining with reference to FIGS. 1 and 2 showing suitable embodiments of the synthetic resin container lid configured according to the present invention, it is conveniently integrally molded from an appropriate synthetic resin such as polyethylene or polypropylene by injection molding or the like. The whole container lid, which can be numbered 2, includes a body 4 and a tamper-evidence hem 6. The main body 4 has a circular top wall 8 and a cylindrical skirt wall 10 hanging from the peripheral edge of the top wall 8. Two seal ridges, that is, an inner annular ridge 12 and an outer annular ridge 14 are formed on the inner surface of the top wall 8.

Continuing the description with reference to FIGS. 1 and 2, in the illustrated container lid 2, the upper surface of the top wall 8 of the main body 4 and the outer peripheral surface of the skirt wall 10 are connected via an arcuate boundary surface in the cross-sectional view. Has been done. The main portion 16 of the outer peripheral surface of the skirt wall 10 is hung substantially vertically, and the lower end portion 18 of the skirt wall 10 extends radially outward toward the lower end in the radial direction, and then extends in the radial direction. It extends in an arc toward the direction. The main portion 18 on the outer peripheral surface of the skirt wall 10 is formed with a knurl 20 composed of a ridge portion extending in the axial direction at intervals in the circumferential direction and a non-ridge portion located between the ridge portions. Has been done. A female screw 22 is formed on the inner peripheral surface of the skirt wall 10. It is convenient that the screwing start tip of the female screw 22 is positioned in the range of 45 degrees to 135 degrees from the center of the projecting piece described later when viewed from above.

The tamper evidence hem portion 6 has a cylindrical shape as a whole, and is connected to the skirt wall 10 of the main body 4 via a plurality of breakable bridges 24 arranged at intervals in the circumferential direction. A locking means 26 is provided on the inner peripheral surface of the tamper evidence hem portion 6. The locking means 26 in the illustrated embodiment is composed of a plurality of locking pieces (one of which is shown in FIG. 2) arranged at intervals in the circumferential direction, and is engaged with the locking means 26. Each of the pieces is inclined inward in the radial direction from the inner peripheral surface of the tamper evidence hem 6 and extends upward. The locking means 26 may be composed of a locking ridge that protrudes inward in the radial direction from the inner peripheral surface of the tamper evidence hem portion 6 instead of the locking piece.

In the region indicated by No. 28 in FIG. 1, the lower end edge of the skirt wall 10 of the main body 4 is displaced upward from the lower end edge of the other region, and in the region indicated by No. 30, the tamper evidence hem portion 6 The upper edge is displaced below the upper edge of the other region, and further in the central part of the regions 28 and 30, the upper edge of the tamper evidence hem 6 is displaced further downward, the skirt wall 10 An opening 32 is generated between the skirt and the tamper evidence hem 6. At the central portion of the opening 32 in the circumferential direction, a substantially rectangular projecting piece 34 projecting downward is formed on the skirt wall 10.

As clearly illustrated in FIG. 1, non-breaking connecting pieces 36a and 36b located on both sides of the protruding piece 34 are further arranged in the opening 32. In the illustrated embodiment, the one-sided non-breaking connecting piece 36a located on the left side (clockwise side when viewed from above) of the protruding piece 34 in FIG. 1 is from one end connected to the tamper evidence hem 6 in FIG. Connected to the counterclockwise tilting portion 38a, which extends substantially horizontally toward the right (and thus toward the projecting piece 34 in the counterclockwise direction when viewed from above), to the other end of the counterclockwise tilting portion 38a. The intervening portion 40a and the other end connected to the intervening portion 40a extend substantially horizontally toward the left (clockwise when viewed from above) in FIG. 1 and the other end is connected to the skirt wall 10. It is composed of a clockwise tilting portion 42a. The extending length of the clockwise tilting portion 42a is larger than the extending length of the counterclockwise tilting portion 38a. The other side non-breaking connecting piece 36b located on the right side (counterclockwise side when viewed from above) of the protruding piece 34 in FIG. 1 is to the left in FIG. 1 from one end connected to the tamper evidence hem 6. A clockwise tilting portion 38b extending substantially horizontally (toward the projecting piece 34 clockwise when viewed from above), an interposing portion 40b connected to the other end of the clockwise tilting portion 38b, and an intervening portion 40b. It extends substantially horizontally to the right (counterclockwise when viewed from above) in FIG. 1 from one end connected to the other end, and the other end is composed of a counterclockwise tilting portion 42b connected to the skirt wall 10. The extending length of the counterclockwise tilting portion 42b is smaller than the extending length of the clockwise tilting portion 38b.

In the container lid 2 configured according to the present invention, the vicinity of the base end of the counterclockwise tilting portion 38a of the one-side non-breaking connection piece 36a (that is, the vicinity of one end connected to the tamper evidence hem portion 6) and the other side non- It is important that the induced forced fracture regions 44a and 44b are arranged in the vicinity of the base end of the clockwise tilting portion 38b of the fracture connection piece 36b (that is, the vicinity of one end connected to the tamper evidence hem portion 6) . Each of the induced forced fracture regions 44a and 44b is arranged by forming notches 46a and 46b in the vicinity of the base end of the counterclockwise tilting portion 38a and in the vicinity of the base end of the clockwise tilting portion 38b. The notch 46a has a form extending downward from the upper edge of the counterclockwise tilting portion 38a, and the upper end edge portion on the left side (clockwise side when viewed from above) in FIG. 1 is facing upward to the left (viewed from above). It is preferable that it has a convex arc shape that smoothly extends in the clockwise direction. Similarly, the notch 46b has a form extending downward from the upper edge of the clockwise tilting portion 38b, and the upper end edge portion on the right side (counterclockwise side when viewed from above) in FIG. 1 is on the right side (upward). It is preferable that it has a convex arc shape that smoothly extends in the counterclockwise direction when viewed from above. In the illustrated embodiment, each of the notches 46a and 46b has a substantially semicircular shape, and both upper end edges of each have a convex arc shape that smoothly extends upward and outward. If desired, the induction is performed by forming locally thinned portions in the vicinity of the base end of the counterclockwise tilting portion 38a and in the vicinity of the base end of the clockwise tilting portion 38b, instead of forming the notches 46a and 46b. Forced break regions 44a and 44b can also be disposed. The induced forced breaking regions 44a and 44b do not break even if the main body 4 is repeatedly opened and closed 50 times with respect to the mouth and neck of the container (this will be described in detail later), however, an excess of about 50 N is applied to the main body 4. It is desirable to forcibly break when a strong force is applied. From such a point, it is preferable that the cross-sectional area of the induced forced fracture regions 44a and 44b is about 40 to 60% of the cross-sectional area of the regions adjacent to them, and particularly in the container lid having a nominal diameter of 28 mm. It is preferable that the cross-sectional areas of the forced fracture regions 44a and 44b have a cross-sectional area of about 0.5 to 0.6 mm ² .

Continuing the description with reference to FIG. 2, the mouth and neck portion 50 of the container, which can be formed of an appropriate synthetic resin such as polyethylene terephthalate or glass, has a cylindrical shape as a whole, and its upper surface is open. A male screw 52 and a locking jaw portion 54 located below the male screw 52 are formed on the outer peripheral surface of the mouth neck 50.

When the container lid 2 is attached to the mouth and neck 50 to seal the mouth and neck 50, the container lid 2 is fitted to the mouth and neck 50 in the closing direction (clockwise when viewed from above in FIG. 2). Rotate and screw the female thread 22 of the container lid 2 into the male thread 52 of the mouth neck 50. The container lid 2 gradually lowers with respect to the mouth and neck 50 as the screwing of the female screw 22 with respect to the male screw 52 progresses. When the container lid 2 is lowered with respect to the mouth neck 50 to the state shown in FIG. 2, the inner annular ridge 14 and the outer annular ridge 14 formed on the inner surface of the top wall 8 of the main body 4 of the container lid 2 are formed. 16 are brought into close contact with the inner and outer peripheral surfaces of the mouth and neck 50, respectively, whereby the mouth and neck 50 is sealed. The locking means 26 disposed on the inner peripheral surface of the tamper evidence hem portion 6 of the container lid 2 elastically overcomes the locking jaw portion 54 of the mouth neck 50 and is below the locking jaw portion 54. To position.

When opening the mouth and neck 50, the container lid 2 is rotated in the opening direction (counterclockwise when viewed from above in FIG. 2), and the female screw of the container lid 2 with respect to the male screw 52 of the mouth and neck 50. The screwing of 22 is gradually released. When the screwing is gradually released, the main body 4 of the container lid 2 is rotated in the opening direction and raised, but the tamper evidence hem 6 is locked by the locking means 26 to the locking chin 54 of the mouth neck 50. As a result, a considerable amount of stress is generated in the breakable bridging portion 24, and the breakable bridging portion 24 is broken. After that, the main body 4 of the container lid 2 rises with the rotation in the opening direction, and is gradually separated upward from the tamper evidence hem 6. As is clearly understood by referring to FIG. 3 together with FIGS. 1 and 2, when the main body 4 is gradually separated upward from the tamper evidence hem 6, the counterclockwise tilting portion of the one-sided non-breaking connecting piece 36a. The counterclockwise tilting portion 42b of the 38a and the other side non-breaking connection piece 36b is swiveled counterclockwise when viewed from the front, and the clock of the clockwise tilting portion 42a of the one side non-breaking connection piece 36a and the other side non-breaking connection piece 36b. The directional tilting portion 38b is swiveled clockwise when viewed from the front, and accordingly, the tilt angle of the counterclockwise tilting portion 38a, the counterclockwise tilting portion 42b, the clockwise tilting portion 42a, and the clockwise tilting portion 38b with respect to the vertical line. Is gradually reduced. The counterclockwise tilting portion 42b of the non-breaking connection piece 36b on the other side has a minute tilt angle because the extending length is minute. In the one-sided non-breaking connection piece 36a, the extending length of the clockwise tilting portion 42a is larger than the extending length of the counterclockwise tilting portion 38a, and in the other side non-breaking connecting piece 36b, the extending length of the clockwise tilting portion 38b. Due to the fact that the existing length is larger than the extended length of the counterclockwise tilting portion 42b, the force that causes the main body 4 of the container lid 2 to be displaced to the left (clockwise when viewed from above) in FIG. However, the displacement of the main body 4 is blocked by the mouth and neck 50, and therefore tensile stress is generated in the clockwise tilting portion 42a and the clockwise tilting portion 38b, and the clockwise tilting portion 42a and the clockwise tilting portion 38b. Is deformed somewhat elastically and somewhat plastically. When the rotation of the main body 2 in the opening direction progresses and the female screw 22 of the container lid 2 is completely unscrewed with respect to the male screw 52 of the mouth neck 50, the main body 4 is detached from the mouth neck 50. Will be done. However, since the main body 4 continues to be connected to the tamper evidence hem 6 that continues to be attached to the mouth neck 50 via the one-side non-breaking connection piece 36a and the other side non-breaking connection piece 36b, the mouth of the container. It will not be separated from the neck 50. When the main body 4 is separated from the mouth and neck 50 and the restraint of the main body 4 by the mouth and neck 50 is released, the elastic deformation of the clockwise tilting portion 42a and the clockwise tilting portion 38b is elastically restored but plastically deformed. The main body 4 is displaced to the left (clockwise when viewed from above) in FIG. 3 with respect to the mouth neck 50 and the tamper evidence hem 6 due to the fact that the body 4 remains as it is.

After the main body 4 of the container lid 2 is detached from the mouth neck 50, the connection region between the one-side non-breaking connection piece 36a and the other side non-breaking connection piece 36b and the tamper evidence hem 10, and thus counterclockwise tilting. The main body 4 is swiveled away from the mouth and neck 50 until the state shown in FIG. 4 is centered on one end of the portion 38a and one end of the clockwise tilting portion 38b. In this way, the outer surface of the lower end (tip) of the protruding piece 34 formed on the main body 4 abuts on the upper surface of the locking chin portion 54 of the mouth and neck, and the lower end of the skirt wall 10 of the main body 4 is tamper evidence. It comes into contact with or is close to the outer peripheral surface of the hem 6, whereby the main body 4 is releasably held at the position shown in FIG. Therefore, the consumer can eat and drink the contents such as soft drinks existing in the container without being hindered by the presence of the main body 4.

When eating and drinking of the contents is interrupted in the middle, the main body 4 held at the position shown in FIG. 4 is swiveled counterclockwise in FIG. 4 to be fitted to the mouth neck 50 again, and the container lid is used. 2 is rotated in the closing direction, and the female thread 22 of the container lid 2 is screwed into the male thread 52 of the mouth neck 50, and thus the container lid 2 is positioned again in the state shown in FIG. 50 can be temporarily sealed. The screwing start tip of the female screw 22 formed on the inner peripheral surface of the skirt wall 10 of the main body 4 is positioned in an angle region in the range of 45 degrees to 135 degrees from the center of the protruding piece 34 when viewed from above. If so, the main body 4 once detached from the mouth and neck 50 is displaced to the left in FIG. 3, so that the screwing start tip of the female screw 22 is slightly outward in the radial direction with respect to the mouth and neck 50. It is displaced. Therefore, even if the screwing start tip of the female screw 22 and the screwing start tip of the male screw 52 are in an angularly aligned state, the main body 4 is smoothly fitted to the mouth neck 50 due to the interference between the two. Is sufficiently reliably avoided.

As mentioned above, in a normal container lid, the main body detached from the mouth and neck is completely separated from the hem of the tamper evidence, so it is rare but the consumer misunderstands or intentionally the mouth and neck. An excessive force may be applied to the main body 4 separated from the 50 to break the one-side non-breaking connection piece 36a and the other side non-breaking connection piece 36b, and the main body 4 may be completely separated from the tamper evidence hem 6. be. In the container lid 2 configured according to the present invention, the induced forced fracture region 44a is arranged near the base end of the counterclockwise tilting portion 38a of the one-side unbreakable connection piece 36a, and the other-side unbreakable connection piece 36b. Since the induced forced fracture region 44b is arranged near the proximal end, the one-sided non-breaking connection piece 36a is broken at the induced forced fracture region 44a, and the other side non-breaking connection piece 36b is also broken at the induced forced fracture region 44b. .. Therefore, as clearly illustrated in FIG. 5, the rest of the one-side unbreakable connection piece 36a and the rest of the other-side unbreakable connection piece 36b remaining in the tamper evidence hem 6 are sufficiently small. In addition, in the illustrated embodiment, the notch 46a constituting the induced forced fracture region 44a extends downward from the upper edge of the counterclockwise tilting portion 38a, and also in FIG. 1 on the left side (viewed from above). The upper end edge on the clockwise side) has a convex arc shape that smoothly extends upward to the left (clockwise when viewed from above). Similarly, the notch 46b constituting the induced forced fracture region 44b has a form extending downward from the upper edge of the clockwise tilting portion 38b, and also the upper end edge on the right side (counterclockwise side when viewed from above) in FIG. The portion has a convex arc shape that smoothly extends upward to the right (counterclockwise when viewed from above). As such, the rest of the one-sided non-breaking connection piece 36a and the rest of the other-side non-breaking connection piece 36b remaining on the tamper evidence hem 6 may cause the consumer to feel uncomfortable or damage the lips. It is avoided as much as possible. More specifically, since the notches 46a and 46b are in the form of extending downward from the upper edge, when an excessive force is applied to the main body 4, the notch progresses downward from the lower end of the notch and is therefore broken. The ends are located below the notches 46a and 46b, and the consumer's lips are prevented from touching the broken ends as much as possible. Further, since the upper ends of the notches 46a and 46b that the consumer's lips may touch are smoothly extending protrusions, there is no risk of damage even if the consumer's lips touch.

On the other hand, when the induced forced breaking regions 44a and 44b are not formed on the one-side non-breaking connection piece 36a and the other side non-breaking connection piece 36b, according to the experience of the present inventors, the consumer misunderstands. Alternatively, when an excessive force is applied to the main body 4 intentionally separated from the mouth neck to break the one-sided non-breaking connection piece 36a and the other side non-breaking connection piece 36b, the one-side non-breaking connection piece 36a tilts counterclockwise. There is a tendency to break in the boundary region between the portion 38a and the intervening portion 40a or in the boundary region between the intervening portion 40a and the clockwise tilting portion 42a. It tends to break in the boundary region with 40b or the boundary region between the intervening portion 40b and the counterclockwise tilting portion 42b. Therefore, as illustrated in FIG. 6, the rest of the one-side unbreakable connection piece 36a and the rest of the other-side unbreakable connection piece 36b remaining in the tamper evidence hem 6 may be relatively large and also have a sharp free end. Not a few. Therefore, the rest of the one-sided non-breaking connection piece 36a and the rest of the other-side non-breaking connection piece 36b remaining on the tamper evidence hem 6 may cause the consumer to feel uncomfortable or damage the lips.

2: Container lid 4: Main body 6: Tamper evidence hem 8: Top wall 10: Skirt wall 22: Female thread 24: Breakable bridging part 26: Locking means 34: Projecting piece 36a: One-sided non-breaking connection piece 36b: Non-breaking connection piece on the other side 38a: Counterclockwise tilting portion 40a: Intervening portion 42a: Clockwise tilting portion 38b: Clockwise tilting portion 40b: Interposing portion 42b: Counterclockwise tilting portion 44a: Induced forced breaking region 44b: Induced forced fracture area 46a: Notch 46b: Notch 50: Container mouth neck 52: Male thread 54: Locking chin

Claims (4)

A synthetic resin container lid applied to a container in which a male screw and a locking jaw located below the male screw are formed on the outer peripheral surface of the mouth and neck.
A main body having a top wall and a tubular skirt wall hanging from the peripheral edge of the top wall, and a female screw thread screwed to the male thread is formed on the inner peripheral surface of the tubular skirt wall. It is connected to the tubular skirt wall of the main body via a plurality of breakable bridges arranged at intervals in the circumferential direction, and is locked to the locking jaw on the inner peripheral surface. Includes a tubular tamper evidence hem and is provided with stopping means
The tubular skirt wall of the main body is disposed with protruding pieces protruding downward, and the tubular skirt wall of the main body and the tubular tamper evidence hem are provided on both sides of the protruding pieces in the circumferential direction. A non-breaking connection piece is arranged to connect with
The one-sided non-breaking connecting piece located clockwise from the protruding piece when viewed from above extends from the base end connected to the tubular tamper evidence hem toward the protruding piece and has a tubular shape. Includes a counterclockwise tilting portion that tilts counterclockwise when viewed from the front when the body is moved upward with respect to the tamper evidence hem.
The other side non-breaking connecting piece located counterclockwise with respect to the protruding piece when viewed from above extends from the base end connected to the tubular tamper evidence hem toward the protruding piece. Includes a clockwise tilting portion that tilts clockwise when viewed from the front when the body is moved upward with respect to the tubular tamper evidence hem.
In the synthetic resin container lid
In the vicinity of the base end of the counterclockwise tilting portion of the one-sided non-breaking connection piece and in the vicinity of the base end of the clockwise tilting portion of the other side non-breaking connecting piece, respectively , above the counterclockwise tilting portion. An induced forced break region is disposed by forming a notch extending downward from the edge and the upper edge of the clockwise tilting portion .
A synthetic resin container lid characterized by this. The upper end edge of the notch in the counterclockwise tilting portion on the clockwise side when viewed from above is a convex arc shape extending smoothly, and the notch in the clockwise tilting portion is on the counterclockwise side when viewed from above. The synthetic resin container lid according to claim 1 , wherein the upper end edge portion has a convex arc shape that extends smoothly. The first or second claim, wherein the cross-sectional area of the induced forced breaking region of the one-sided non-breaking connecting piece and the cross-sectional area of the induced forced breaking region of the other-side non-breaking connecting piece are 0.5 to 0.6 mm ² . Synthetic resin container lid. The one-sided non-breaking connecting piece extends above the counterclockwise tilting portion from the base end connected to the tubular skirt wall toward the protruding piece and with respect to the tubular tamper evidence hem. The other side non-breaking connecting piece comprises a clockwise tilting portion that is tilted clockwise when the body is moved upward, from the proximal end connected to the tubular skirt wall towards the projecting piece. The first aspect of the present invention includes a counterclockwise tilting portion extending above the clockwise tilting portion and tilting counterclockwise when the main body is moved upward with respect to the tubular tamper evidence hem. The synthetic resin container lid according to any one of up to 3 .

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