JP5948181B2 - Plastic container lid - Google Patents

Description

  The present invention relates to a synthetic resin container lid having tamper-evident characteristics that prevents the entire container lid from being separated from the container even after the opening of the mouth and neck of the container. Including a pair of non-breaking connecting pieces and a tamper evidence hem connected through a plurality of broken bridging parts, even if the bridging part is broken and the main body is detached from the mouth and neck of the container, The present invention relates to a synthetic resin container lid of a type in which a main body is continuously connected to a tamper evidence skirt that is continuously attached to a mouth and neck of a container via a non-breaking connecting piece.

  As a synthetic resin container lid with tamper evident characteristics applied to a container in which a male thread and a locking jaw part located below the male thread are formed on the outer peripheral surface of the mouth and neck, The following Patent Document 1 has a circular top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and a female thread that is screwed onto the male thread is formed on the inner peripheral surface of the skirt wall. A tamper, which is connected to the main body via a pair of non-breaking connecting pieces and a plurality of broken bridging portions, and is provided with locking means to be locked to the locking jaws on the inner peripheral surface A synthetic resin container lid including an evidence skirt is disclosed. A projecting piece projecting downward is formed on the skirt wall, a notch for receiving the projecting end of the projecting piece is formed on the tamper evidence skirt, and the pair of non-breaking connecting pieces are adjacent to the projecting piece. It arrange | positions at the direction both sides, and the some fracture | rupture bridge part is arrange | positioned at intervals in the circumferential direction at least in the area | regions other than the area | region where a protrusion piece and a pair of non-breaking connection piece exist. Each of the pair of non-breaking connecting pieces has a tilting portion whose tilt angle with respect to the vertical line is gradually decreased when the main body is moved upward with respect to the tamper evidence skirt.

  When opening the mouth and neck portion of the container, the main body is rotated in the opening direction to gradually release the screwing of the female thread with respect to the male thread. In this way, the main body is gradually raised with respect to the mouth and neck, but the tamper evidence skirt is prevented from rising because the locking means is locked to the locking jaw of the mouth and neck, and therefore the break bridge Stress is generated in the part, and the fractured bridge part is broken. On the other hand, the non-breaking connecting piece is not broken, although the tilt angle of the tilting portion is gradually decreased. Therefore, even if the main body is detached from the mouth-neck portion of the container, the main body is continuously connected to the tamper-evidence hem portion continuously attached to the mouth-neck portion via the pair of non-breaking connection pieces. In order to displace the main body from the mouth and neck of the container, when the main body is swung with respect to the tamper evidence hem with the predetermined portion of the pair of non-breaking connecting pieces as the swivel center, the protruding piece disposed on the main body is Then, it elastically climbs over the locking jaw part of the mouth-and-neck part, whereby the main body is turned and held at a position displaced from above the mouth-and-neck part. A sound is generated when the protruding piece elastically deforms to get over the locking jaw and then elastically recovers.

JP 2010-18290 A

  According to the experience of the present inventor, the conventional synthetic resin container lid as described above has the following problems to be solved. When the main body, which has been detached from the mouth and neck of the container, is swung with respect to the tamper evident hem, the protruding piece is placed on the inner peripheral surface of the tamper evident hem prior to overcoming the locking jaw. Locking means provided (the locking means are a plurality of arc-shaped locking pieces extending radially inward and upward at intervals in the circumferential direction, or extending in the circumferential direction and extending radially. Sound is generated due to abutting (and consisting of an annular locking piece extending inward and upward) and then overcoming the locking means. The sound generated when the main body is swung to the required position over the locking jaw of the mouth and neck is preferable because it allows the consumer to recognize that the main body has been swung to the required position. The fact that the sound is generated in the middle of turning until the consumer misunderstands that the turning of the main body is completed, for example, and the consumer interrupts the turning of the main body when the sound is generated Is not preferable.

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that when the main body released from the mouth and neck of the container is swung with respect to the tamper evidence skirt, the protruding piece is engaged. Prior to overcoming the stop jaw, the conventional container can be used to suppress or avoid the generation of sound due to the presence of the locking means disposed on the inner peripheral surface of the tamper evidence skirt. It is to solve the problem as described above existing in the lid.

  In order to avoid the protruding piece coming into contact with the locking means when the main body is swung, it may be intended to omit the locking means at the angular position where the protruding piece exists. However, since the notch that receives the protruding end of the protruding piece of the tamper evidence hem at the angular position where the protruding piece exists is formed, the axial dimension of the tamper evidence skirt is locally reduced, Therefore, the strength of the tamper evidence skirt is locally reduced. If the locking means is omitted, the local strength reduction of the tamper evidence skirt is promoted. Therefore, in the present invention, at the angular position where the protruding piece exists, the thickness of at least the extended end portion of the arc-shaped locking piece or the annular locking piece is reduced to reduce the local strength of the tamper-evident hem. Suppressing as much as possible to reduce or avoid the degree of interference of the locking means with the protruding piece, thus suppressing or avoiding the generation of noise when the locking means gets over the protruding piece. .

That is, according to the present invention, as a synthetic resin container lid that achieves the main technical problem described above, 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 synthetic resin container lid applied to the container being
A main body having a circular top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall, and a female thread that is screwed onto the male thread is formed on the inner peripheral surface of the skirt wall; The tamper-evidence hem is connected to the main body through a non-breaking connecting piece and a plurality of broken bridging portions, and an inner peripheral surface is provided with a locking means to be locked to the locking jaw. Including
A projecting piece projecting downward is formed on the skirt wall, and a notch opened upward is formed on the skirt portion of the tamper evidence to receive the projecting end of the projecting piece, and the pair of non-breaking connecting pieces Is disposed on both sides in the circumferential direction adjacent to the projecting piece, and the plurality of fractured bridging portions are spaced circumferentially at least in a region other than the region where the projecting piece and the pair of non-breaking connecting pieces exist. Each of the pair of non-breaking connecting pieces has a tilting portion whose inclination angle with respect to a vertical line is gradually reduced when the main body is moved upward with respect to the tamper evidence skirt,
The locking means disposed on the inner peripheral surface of the tamper evidence skirt has a plurality of arc-shaped locking pieces extending radially inward and upward at intervals in the circumferential direction or continuous in the circumferential direction. In the synthetic resin container lid composed of an annular locking piece extending inward and upward in the radial direction,
At the angular position where the projecting piece is disposed, at least the extended end of the arc-shaped locking piece or the annular locking piece is reduced in thickness, and the plurality of broken bridging parts are broken. Interference of the arc-shaped locking piece or the annular locking piece with the protruding piece when the main body is swung with respect to the tamper-evidence skirt after the main body is detached from the mouth-and-neck portion There is provided a synthetic resin container lid characterized in that it is reduced or avoided.

  It is preferable that at least the extended end portion of the arc-shaped locking piece or the annular locking piece is gradually reduced in thickness toward the extended end.

  In the synthetic resin container lid of the present invention, the arc-shaped locking piece or the annular locking piece can be extended without omitting the arc-shaped locking piece or the annular locking piece at the angular position where the protruding piece is disposed. Since the thickness of the end portion is reduced, the local strength reduction of the tamper evidence skirt is avoided as much as possible. On the other hand, when the main body is swung with respect to the tamper-evidence hem after the plurality of fractured bridging parts are broken and the main body is detached from the mouth and neck, the arc-shaped locking piece or the annular engagement with the protruding piece is provided. The interference of the stop piece is avoided, and therefore the sound is caused by the presence of the locking means arranged on the inner peripheral surface of the tamper evidence hem before the protruding piece gets over the locking jaw. Is never generated.

The front view which shows suitable embodiment of the container lid comprised according to this invention. The rear view which shows a part of cross section of the container lid of FIG. The bottom view of the container lid of FIG. The front view which shows the state which mounted | wore the mouth neck part of the container with the container lid of FIG. The front view which shows the opening operation intermediate state which rotated the main body to the opening direction and made it raise in order to detach | leave the main body of the container lid of FIG. 1 from the opening neck. FIG. 2 is a cross-sectional view showing a state in which the main body of the container lid of FIG. 1 is somewhat swiveled with respect to the tamper evidence hem after being detached from the mouth and neck. The expanded sectional view of the protrusion piece vicinity in the state of FIG. Sectional drawing which shows the state swiveled to the predetermined position with respect to the tamper evidence bottom part after detaching | releasing the main body of the container lid of FIG. 1 from the opening neck. FIG. 9 is an enlarged cross-sectional view in the vicinity of a protruding piece in the state of FIG. 8.

  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.

  Referring to FIGS. 1-3 which illustrate a preferred embodiment of a synthetic resin container lid constructed in accordance with the present invention, it may be expediently made by injection molding or compression molding from a suitable synthetic resin such as polyethylene or polypropylene. A container lid, generally designated 2, that can be integrally molded, includes a body 4 and a tamper evidence skirt 6. The main body 4 has a circular top wall 8 and a cylindrical skirt wall 10 depending from the periphery of the top wall 8. Two sealing 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. Concavities and convexities 16 are repeatedly formed on the outer peripheral surface of the skirt wall 10 to prevent slipping of a finger hung thereon. A female thread 18 is formed on the inner peripheral surface of the skirt wall 10. A cutout 20 is formed in the female thread 18 at intervals in the circumferential direction. The tamper evidence skirt portion 6 has a cylindrical shape as a whole, and is connected to the skirt wall 10 of the main body 4 via a fracture bridge portion and a pair of non-breakage connection pieces described later. Locking means 22 is disposed on the inner peripheral surface of the tamper evidence skirt 6. In the illustrated embodiment, the locking means 22 is composed of six arc-shaped locking pieces 24a to 24f formed at intervals in the circumferential direction. Each of the arc-shaped locking pieces 24a to 24f extends radially inward and upward in the axial direction from the inner peripheral surface of the tamper evidence skirt 6. Each of the arc-shaped locking pieces 24a to 24f is formed with a slit 26 extending from the extending end edge toward the proximal end portion of the arc-shaped locking piece in the circumferential intermediate portion. In the illustrated embodiment, the locking means 22 comprises six arcuate locking pieces 24a to 24f, but if desired, an annular ring extending continuously in the circumferential direction and extending radially inward and upward. The locking means can be constituted by the locking piece.

  1 to 3, the lower end edge of the skirt wall 10 of the main body 4 is displaced above the lower end edge of the other region in the region indicated by numeral 28. The upper edge of the dent skirt 6 is displaced below the upper edge of the other region, and an opening 30 extending horizontally in the front view is created between the skirt wall 10 and the tamper evidence skirt 6. ing. A substantially rectangular protruding piece 32 that protrudes downward from the lower end of the skirt wall 10 is formed at the center in the circumferential direction of the opening 30. As clearly understood by referring to FIG. 7 in conjunction with FIG. 1, the projecting piece 32 hangs substantially vertically, and then hangs substantially vertically after being slightly displaced radially outwardly. A step 34 is formed. Corresponding to the projecting piece 32, the tamper evidence skirt 6 is formed with a notch 36 opened upward to receive the projecting end of the projecting piece 32. The notch 36 prevents the tamper evidence skirt 6 from preventing the swiveling of the protruding piece 32 when opening the mouth and neck portion 52 as described later.

  As clearly shown in FIGS. 1 and 2, a pair of non-breaking connection pieces 38 a and 38 b are further disposed in the opening 30 adjacent to the protruding piece 32 on both sides in the circumferential direction. In the illustrated embodiment, the non-breaking connecting piece 38a is substantially horizontally on the upper end 40a connected to the lower end edge of the skirt wall 10 and on the one side in the circumferential direction (right side in FIGS. 1 and 2) following the upper end 40a. The second tilting that extends substantially horizontally to the other side in the circumferential direction (the left side in FIGS. 1 and 2) below the first tilting portion 42a following the first tilting portion 42a, the intermediate portion 44a, and the intermediate portion 44a that extend. It is comprised from the lower end part 48a connected to the part 46a and the tamper evidence skirt part 6. FIG. The non-breaking connecting piece 38b includes an upper end 40b connected to the lower end edge of the skirt wall 10, a connecting part 42b having a narrow width on one side in the circumferential direction (left side in FIGS. 1 and 2), and an intermediate part. 44b, connected to the second tilting portion 46b and the tamper evidence skirt 6 extending substantially horizontally to the other side in the circumferential direction (the right side in FIGS. 1 and 2) below the coupling portion 42b following the intermediate portion 44b. It is comprised from the lower end part 48b. If desired, the first tilting part 42a and the second tilting part 46a of the non-breaking connection piece 38a and the second tilting part 46b of the non-breaking connection piece 38b can be tilted in a predetermined direction instead of being substantially horizontal. . In the illustrated embodiment, the non-breaking connecting piece 38a and the non-breaking connecting piece 38b are not line-symmetric and the circumferential dimensions of the components are somewhat different. The reason for this is disclosed in JP 2012-76771. Refer to the description in the specification.

  In a region other than the region indicated by numeral 28, that is, a region other than the region where the protruding piece 32 and the pair of non-breaking connecting pieces 38 a and 38 b exist, a plurality of tamper evidence skirts 6 are connected to the lower end of the skirt wall 10 of the body 4 A plurality of, for example, six fractured bridging portions 50 are arranged at intervals in the circumferential direction. Each of the breaking bridge portions 50 may have a known form. If desired, even in the region where the pair of non-breaking connecting pieces 38a and 38b exist, for example, between the first tilting portion 42a and the connecting portion 42b or the second tilting portions 46a and 46b and the lower end of the skirt wall 10. A fracture bridge 50 can also be provided.

  In the present invention, it is important that the thickness of at least the extended end portion of the arc-shaped locking piece 24a (or the annular locking piece) is reduced at the angular position where the protruding piece 32 exists. In the illustrated embodiment, as clearly understood from FIGS. 7 and 9, the arcuate locking piece 24 a located at the angular position where the protruding piece 32 is disposed, except for the base end where the slit 26 exists, The thickness of the arcuate locking piece 24a is gradually reduced toward the extending end (the reason will be described in detail later). In the illustrated embodiment, the thickness of the arcuate projecting piece 24a is reduced only in the region indicated by the symbol A in FIGS. 2 and 3, but if desired, the thickness of the arcuate projecting piece 24a is increased over the entire circumferential direction. Can also be reduced. Further, instead of gradually reducing the thickness, the thickness of at least the extended end portion of the arc-shaped protruding piece 24a can be reduced to a constant thickness.

  FIG. 4 also shows the mouth / neck portion 52 of the container together with the container lid 2. The mouth-and-neck portion 52 of the container which can be formed from an appropriate synthetic resin such as polyethylene terephthalate or glass has a cylindrical shape as a whole, and its upper surface is opened. On the outer peripheral surface of the mouth-and-neck portion 52, a male thread 54 and a locking jaw 56 positioned below the male thread 54 are formed.

  When the container lid 2 is attached to the mouth-and-neck portion 52 and the mouth-and-neck portion 52 is sealed, the container lid 2 is fitted on the mouth-and-neck portion 52 and closed (clockwise as viewed from above in FIG. 4). The female thread 18 of the container lid 2 is screwed together with the male thread 54 of the mouth-and-neck portion 52 by rotating. The container lid 2 gradually descends with respect to the mouth-and-neck portion 52 in accordance with the progress of the screwing of the female thread 18 with respect to the male thread 54. When the container lid 2 is lowered with respect to the mouth-and-neck portion 52 to the state shown in FIG. 4, the inner annular ridge 12 and the outer annular ridge formed on the inner surface of the top wall 8 in the main body 4 of the container lid 2. 14 are respectively brought into close contact with the inner peripheral surface and the outer peripheral surface of the mouth-and-neck portion 52, whereby the mouth-and-neck portion 52 is sealed. The locking means 22 disposed on the inner peripheral surface of the tamper evidence skirt 6 of the container lid 2 elastically climbs over the locking jaw portion 56 of the mouth-and-neck portion 52 and is placed on the lower surface of the locking jaw portion 56. It can be locked.

  When opening the mouth-and-neck part 52, the container lid 2 is rotated in the opening direction (counterclockwise as viewed from above in FIG. 4), and the female thread of the container lid 2 with respect to the male thread 54 of the mouth-and-neck part 52 is rotated. The 18 screws are gradually released. When the screwing is gradually released, the main body 4 of the container lid 2 is rotated and raised in the opening direction, but the tamper evidence skirt 6 is locked by the locking means 22 of the mouth-and-neck portion 52 by the locking means 22. As a result, the rise is prevented, and due to this, a considerable stress is generated in the fracture bridge portion 50, and the fracture bridge portion 50 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 skirt 6. As clearly understood by referring to FIG. 5 in conjunction with FIG. 4, when the body 4 is gradually separated from the tamper evidence skirt 6 upwardly, the first tilting portion 42a of the non-breaking connecting piece 38a and the non-breaking The second tilting part 46b of the connecting piece 38b is pivoted clockwise in FIGS. 4 and 5 around the lower ends of the respective intermediate part 44a and the second tilting part 46b, that is, tilted clockwise, while not breaking. The second tilting piece 46a of the piece 38a and the connecting portion 42b of the non-breaking connecting piece 38b are pivoted counterclockwise in FIGS. 4 and 5 around the respective lower and upper ends, that is, tilted counterclockwise. Accordingly, the inclination angles of the first tilt part 42a and the second tilt part 46b in the non-breaking connection pieces 38a and 38b with respect to the vertical line are gradually reduced. As clearly understood by referring to FIG. 6 together with FIGS. 4 and 5, when the female thread 18 of the container lid 2 is completely disengaged from the male thread 54 of the mouth-and-neck 52, the container The main body 4 of the lid 2 is detached from the mouth / neck portion 52. However, the main body 4 is separated from the container neck 52 because it continues to be connected to the tamper evidence skirt 6 that is still attached to the mouth neck 52 via the non-breaking connection pieces 38a and 38b. There is nothing.

  After the main body 4 of the container lid 2 is detached from the mouth-and-neck portion 52, the main body 4 is turned in a direction away from the mouth-and-neck portion 52 with the non-breaking connection pieces 38a and 38b as hinge fulcrums. At this time, as shown in FIGS. 6 and 7, the protruding piece 32 pivots in a direction approaching the mouth-neck portion 52 of the container until the inner surface of the extending end faces the lower surface of the locking jaw portion 56 of the container. To do. Thus, in the container lid 2 constructed according to the present invention, since the thickness of at least the extending end of the arc-shaped locking piece 24a is reduced, the arc-shaped locking with respect to the projecting piece 32 to be swung is performed. The degree to which the piece 24a is caused to interfere with the protruding piece 32 is reduced or avoided. Therefore, before the protruding piece 32 gets over the locking jaw portion 56, a sound is generated due to the presence of the locking means 22 disposed on the inner peripheral surface of the tamper evidence skirt portion 6. Is suppressed or avoided. In the illustrated embodiment, the slit 26 is disposed at a position corresponding to the intermediate portion in the circumferential direction of the protruding piece 32, and as a result, the resistance that the protruding piece 32 gets over the arcuate locking piece 24 a is reduced, This also suppresses or avoids the generation of sound. As shown by a two-dot chain line in FIG. 7, the thickness of at least the extended end portion of the arc-shaped locking piece 24 a is not reduced, and the same shape as that of the other arc-shaped locking pieces 24 b to 24 f (gradually toward the tip. In the case where the thickness is increased), when the protruding piece 32 is swung, the protruding piece 32 is elastically deformed by interference with the arc-shaped locking piece 24a and is separated from the arc-shaped locking piece 24a. A sound is generated.

  When the main body 4 is swung to the state shown in FIGS. 8 and 9, the protruding piece 32 elastically climbs over the locking jaw portion 56 of the mouth-and-neck portion 52, and then elastically restores to above the locking jaw portion 56. The step 34 formed on the outer surface of the projecting piece 32 or the outer end of the projecting piece 32 is engaged with the upper surface of the engaging jaw 56. Thus, the main body 4 is held at the position shown in FIG. 8, and thereby the main body 4 is held at the position shown in FIG. Therefore, the consumer can eat and drink contents such as a soft drink present in the container without being obstructed by the presence of the main body 4. When the protruding piece 32 moves over the locking jaw 56 and elastically recovers, a sound is generated so that the consumer can recognize that the main body 4 has been turned to the required position.

  When the eating and drinking of the contents is interrupted, the main body 4 held at the position shown in FIG. 8 is turned in the direction approaching the mouth and neck portion 52 and is fitted on the mouth and neck portion 52 again. The container lid 2 is rotated in the closing direction so that the female thread 18 of the container lid 2 is screwed into the male thread 54 of the mouth-and-neck portion 52, and thus the container lid 2 is again positioned as shown in FIG. The neck 52 can be temporarily sealed.

2: Container lid 4: Main body 6: Tamper evidence hem 8: Top wall 10: Skirt wall 18: Female thread 22: Locking means 24a: Arc-shaped locking piece 24b: Arc-shaped locking piece 24c: Arc-shaped locking piece 24d: Arc-shaped locking piece 24e: Arc-shaped locking piece 24f: Arc-shaped locking piece 32: Projection piece 38a: Non-breaking connection piece 38b: Non-breaking connection piece 50: Breaking bridge portion 52: Mouth neck portion 54: Male thread 56: Locking jaw

Claims (2)

A synthetic resin container lid applied to a container in which a male thread and a locking jaw part located below the male thread are formed on the outer peripheral surface of the mouth and neck,
A main body having a circular top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall, and a female thread that is screwed onto the male thread is formed on the inner peripheral surface of the skirt wall; The tamper-evidence hem is connected to the main body through a non-breaking connecting piece and a plurality of broken bridging portions, and an inner peripheral surface is provided with a locking means to be locked to the locking jaw. Including
A projecting piece projecting downward is formed on the skirt wall, and a notch opened upward is formed on the skirt portion of the tamper evidence to receive the projecting end of the projecting piece, and the pair of non-breaking connecting pieces Is disposed on both sides in the circumferential direction adjacent to the projecting piece, and the plurality of fractured bridging portions are spaced circumferentially at least in a region other than the region where the projecting piece and the pair of non-breaking connecting pieces exist. Each of the pair of non-breaking connecting pieces has a tilting portion whose inclination angle with respect to a vertical line is gradually reduced when the main body is moved upward with respect to the tamper evidence skirt,
The locking means disposed on the inner peripheral surface of the tamper evidence skirt has a plurality of arc-shaped locking pieces extending radially inward and upward at intervals in the circumferential direction or continuous in the circumferential direction. In the synthetic resin container lid composed of an annular locking piece extending inward and upward in the radial direction,
At the angular position where the projecting piece is disposed, at least the extended end of the arc-shaped locking piece or the annular locking piece is reduced in thickness, and the plurality of broken bridging parts are broken. Interference of the arc-shaped locking piece or the annular locking piece with the protruding piece when the main body is swung with respect to the tamper-evidence skirt after the main body is detached from the mouth-and-neck portion A synthetic resin container lid characterized in that is reduced or avoided.   The synthetic resin container lid according to claim 1, wherein at least the extending end of the arc-shaped engaging piece or the annular engaging piece is gradually reduced in thickness toward the extending end.

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