JP5574582B2 - 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 opening the mouth and neck of the container. A tamper-evident hem connected to the main body through a plurality of breakable bridging parts arranged at intervals, the bridging part is broken and the main body is detached from the mouth and neck of the container The present invention also relates to a synthetic resin container lid of the type in which the main body is continuously connected to the tamper-evidence skirt that is continuously attached to the mouth and neck of the container via the non-breaking connection piece.

As a synthetic resin container lid with tamper-evident characteristics, applied to a container in which a male thread and a locking projection located below the male thread are formed on the outer peripheral surface of the mouth and neck, The following Patent Document 1 has a 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 of the mouth and neck on the inner peripheral surface of the skirt wall. It is connected to the skirt wall of the main body via a formed main body and a plurality of breakable bridge portions arranged at intervals in the circumferential direction . There is disclosed a synthetic resin container lid including a cylindrical tamper-evidence skirt portion provided with a locking means to be locked to the bottom. Protruding pieces projecting downward are arranged on the skirt wall of the main body, and the skirt wall of the main body and the tamper evidence hem are connected to both sides of the projecting piece in the circumferential direction, and the tamper evidence hem is connected to the skirt wall. On the other hand, there is provided a non-breaking connecting piece having a tilting portion whose tilt angle with respect to the vertical line is gradually reduced when the main body is moved upward.

When the container lid as described above is attached to the mouth and neck of the container and the mouth and neck are sealed, the container lid is fitted on the mouth and neck and rotated in the closing direction, and the female thread on the container lid is opened. Screw it onto the male thread on the neck. As the screwing progresses, the container lid is lowered with respect to the mouth and neck, and the locking means locked to the skirt of the tamper evidence elastically rides over the locking ridge of the mouth and neck and below it. Can be locked. 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. The main body of the container lid is raised with respect to the mouth and neck when the screwing is released, but the tamper evidence hem is prevented from rising because the locking means is locked to the locking projection of the mouth and neck. Therefore, stress is generated in the breakable bridge portion and the breakable bridge portion is broken. When the breakable bridging portion is broken and the main body continues to rise, and the main body is separated upward from the tamper evidence skirt, the inclination of the tilted portion of the non-breaking connecting piece is gradually reduced accordingly. . Even after the body is removed from the neck and neck, the tamper evident hem continues to be attached to the mouth and neck, and the body continues to be connected to the tamper evidence hem via a non-breaking connection piece, thus separating from the container It will never be done.

Thus, the container lid as described above disclosed in Patent Document 1 has the following problems to be solved. First, since the non-cutting connection piece is composed of only a single tilting portion and the circumferential extension distance of the non-breaking connection piece is limited to a region where there is no breakable bridging portion, inevitably When the height of the main body is limited with respect to the tamper evidence hem, and therefore the distance of the main body when the main body is removed from the mouth and neck is relatively short (in other words, the axial direction of the male thread in the mouth and neck Only applicable when the dimensions are relatively short.

Secondly, when the body is rotated in the opening direction to open the mouth and neck, the body is excessively displaced in the circumferential direction with respect to the tamper evidence hem after the breakable bridging portion is broken. As a result, a large stress is generated in the non-breaking connection piece, and the non-breaking connection piece may be broken. Moreover, when the container lid is attached to the mouth / neck portion, there is a possibility that the fracture bridge portion is broken.

  The present invention has been made in view of the above-mentioned facts, and the first technical problem thereof is to improve the container lid as described above disclosed in Patent Document 1 so that the main body is detached from the mouth and neck. Even when the ascending distance of the main body is relatively long, it can be applied without causing a problem.

In addition to solving the first technical problem described above , the second technical problem of the present invention is that the displacement of the main body in the circumferential direction with respect to the tamper evidence skirt is sufficiently suppressed, and the mouth and neck are opened. To ensure that the non-breaking connecting piece is ruptured without fail, and that the rupture bridging portion is ruptured when the container lid is attached to the mouth and neck. Is to do.

According to the present invention, as a synthetic resin container lid that achieves the first technical problem described above, a male thread and a locking protrusion located below the male thread are formed on the outer peripheral surface of the mouth and neck. A synthetic resin container lid applied to a container that has a top surface wall and a cylindrical skirt wall that hangs down from the peripheral edge of the top surface wall. An inner peripheral surface connected to the skirt wall of the main body through a main body in which a female thread to be screwed is formed and a plurality of breakable bridging portions arranged at intervals in the circumferential direction Includes a cylindrical tamper-evidence hem portion on which locking means to be locked to the locking ridge is provided, and a protruding piece protruding downward is provided on the skirt wall of the main body. The skirt wall of the main body and the tamper evidence skirt are connected to both sides of the protruding piece in the circumferential direction, and Body is in the non-breaking plastic container closure which connecting piece is provided with a tilting unit which is inclination angle with respect to a vertical line when moved in the upward is gradually brought reduced relative Npaebidento skirt,
One of the non-breaking connecting pieces is inclined downward or extends substantially horizontally horizontally to one side in the circumferential direction, and the lower part of the first inclined part follows the first inclined part . has a second tilting portion extending inclined or substantially horizontally circumferentially other side to the other of the non-broken connection piece is inclined downward or substantially horizontally said circumferential direction other second tilting portion extending in the first tilting portion and inclined to or substantially horizontally said circumferential side toward the lower side of the first tilting portion downward following the tilting portion of the first extending side A synthetic resin container lid is provided.

Preferably, the first tilting portion and the second tilting portion in each of the non-breaking connecting pieces are connected via a thin portion. The second technical problem is that the tamper evidence hem is projected upward between the projecting piece and the non-breaking connecting piece in the circumferential direction, and is positioned adjacent to both side edges of the projecting piece. This is achieved by arranging the pieces. The circumferential distance between the protruding piece and the guide piece is preferably 0.3 to 1.0 mm.

In plastic container closure which is in the onset Ming Thus provided, because each of the unbroken connecting pieces is in a form comprising two inclined portion inclining direction are opposite to each other, only a single tilt part Compared with the case, the allowable rise distance of the main body with respect to the tamper evidence hem is substantially doubled without the need to increase the circumferential dimension in which the non-cut connection piece exists, and the main body is detached from the mouth and neck. Even when the ascending distance of the main body is relatively long, it can be applied without causing a problem.

The tamper evidence skirt is provided with guide pieces that protrude upward between the protruding piece and the non-breaking connecting piece in the circumferential direction, and are respectively positioned close to both side edges of the protruding piece. In the synthetic resin container lid, the displacement of the body in the circumferential direction with respect to the tamper evidence hem is sufficiently suppressed by the cooperation of the projecting piece and the guide piece located close to both sides thereof. It is ensured that the non-breaking connecting piece will be ruptured when opening the part, and that the rupture bridging part will be ruptured when attaching the container lid to the mouth and neck part. Avoided.

  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. A circular recess 12 is formed at the center of the top surface of the top wall 8 to avoid the formation of protrusions during injection molding. Two seal ridges, that is, an inner annular ridge 14 and an outer annular ridge 16 are formed on the inner surface of the top wall 8. Concavities and convexities 18 are repeatedly formed on the outer peripheral surface of the skirt wall 10 to prevent the slipping of fingers hung thereon. A female thread 20 is formed on the inner peripheral surface of the skirt wall 10. The female thread 20 is formed with a notch 22 at intervals in the circumferential direction. Further, a plurality of slits 24 extending in the circumferential direction are formed at the upper end portion of the skirt wall 10 at intervals in the circumferential direction.

  The tamper evidence skirt 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 bridging portions 26 arranged at intervals in the circumferential direction. The breakable bridge portion 26 may be substantially the same as the breakable bridge portion disclosed in Japanese Patent Application Laid-Open No. 2007-191206, and the upper end portion 28 connected to the lower end portion of the inner peripheral surface of the skirt wall 10 and the tamper shrimp. Along with the lower end portion 30 connected to the upper end portion of the inner peripheral surface of the dent skirt portion 6, there is an intermediate portion 32 whose cross-sectional area is reduced. Locking means 34 is disposed on the inner peripheral surface of the tamper evidence skirt 6. The locking means 34 in the illustrated embodiment is composed of a plurality of locking pieces 36 arranged at intervals in the circumferential direction, and each of the locking pieces 36 is an inner part of the tamper evidence skirt 6. Inclined radially inward from the circumferential surface and extended upward.

  As clearly understood by referring to FIG. 8 together with FIGS. 1 to 3, a plurality of pedestal pieces 38 are formed on the upper end surface of the tamper evidence skirt 6 at intervals in the circumferential direction. One pedestal piece 40 is also formed on the lower end surface of the main body 4.

  The configuration of the illustrated container lid 2 as described above does not constitute a novel feature of the container lid 2 constructed in accordance with the present invention and may itself be in a well-known form, so a detailed description thereof will not be given. It is omitted in this specification.

With further reference to FIGS. 1 to 3, in a region indicated by numeral 42, the lower edge of the skirt wall 10 of the body 4 has been allowed displaced upward from the lower edge of the other areas, also Tanpaebi The upper edge of the dent skirt 6 is displaced below the upper edge of the other region, and the upper edge of the tamper evidence skirt 6 is further displaced downward in the center of the region 42. In the front view, an opening 44 having a substantially horizontally long rectangular shape is formed between the skirt wall 10 and the tamper evidence skirt 6. A substantially rectangular protruding piece 46 protruding downward is formed on the skirt wall 10 at the circumferential center of the opening 44. As clearly understood by referring to FIG. 4, the projecting piece 46 hangs substantially vertically and then hangs substantially vertically after being slightly displaced radially outward, and has a stepped portion on its outer surface. 47 that have been formed. On the other hand, guide pieces 48 a and 48 b projecting upward on both sides of the projecting piece 46 are formed on the tamper evidence skirt 6. It is important that each of the guide pieces 48a and 48b is close to both side edges of the protruding piece 46, and the circumferential interval G between the protruding piece 46 and each of the guide pieces 48a and 48b is 0.3 to 1.0 mm. It is preferable that it is about.

  As clearly shown in FIGS. 1 to 3, non-breaking connection pieces 50 a and 50 b located outside the guide pieces 48 a and 48 b in the circumferential direction are further disposed in the opening 44. In other words, the guide pieces 48a and 48b are disposed between the protruding piece 46 and the non-breaking connection pieces 50a and 50b, respectively. The non-breaking connection piece 50a in the illustrated embodiment has an upper end portion 52a connected to the lower end edge of the skirt wall 10, and then continues to the lower end side of the skirt wall 10 on the one side in the circumferential direction (left side in FIGS. 1 and 2). A first inclined portion 54a extending in an inclined manner, an intermediate portion 56a extending in a substantially semicircular shape, and a second extending in an inclined manner toward the other side in the circumferential direction (right side in FIGS. 1 and 2) following the intermediate portion 56a. The lower end portion 60 a connected to the tilting portion 58 a and the tamper evidence skirt portion 6. The intermediate portion 56a includes a thin portion 62a that extends over the entire width in the circumferential direction. The non-breaking connecting piece 50b has a line symmetrical shape with the non-breaking connecting piece 50a, and is connected to the lower end edge of the skirt wall 10 and the upper end portion 52b, and then the upper end portion 52b. The first tilting portion 54b extending obliquely (left side in FIG. 2), the intermediate portion 56b extending substantially in a semicircular shape, and the other side in the circumferential direction facing downward (right side in FIGS. 1 and 2). It is composed of a second tilting part 58b extending in an inclined manner and a lower end part 60b connected to the tamper evidence skirt part 6, and a thin part 62b extending over the entire width in the circumferential direction exists in the intermediate part 56b. To do. If desired, the first tilting part 54a and the second tilting part 58a in the non-breaking connection piece 50a and the first tilting part 54b and the second tilting part 58b in the non-breaking connection piece 50b are tilted in a predetermined direction. It can also extend substantially horizontally.

  FIG. 5 shows a modification of the non-breaking connecting piece. In the modification shown in FIG. 5, the non-breaking connection piece 150 a includes an upper end 152 a connected to the lower end edge of the skirt wall 10, and the other end in the circumferential direction downward (following FIG. 1 and FIG. 1). The first tilting part 154a extending inclined to the right side in FIG. 2, the intermediate part 156a extending in a substantially semicircular shape, and the intermediate part 156a is inclined to one side in the circumferential direction (left side in FIGS. 1 and 2) downward. And a lower end portion 160a connected to the tamper evidence skirt 6 and the intermediate portion 156a has a thin portion 162a extending over the entire width in the circumferential direction. . The non-breaking connection piece 150b has a line symmetrical shape with the non-breaking connection piece 150a, and has an upper end 152b connected to the lower end edge of the skirt wall 10, and the other end in the circumferential direction toward the lower side following the upper end 152b (FIG. 1). And a first tilting portion 154b extending in a slanting direction (right side in FIG. 2), an intermediate portion 156b extending in a substantially semicircular shape, and a circumferential direction one side (left side in FIGS. 1 and 2) directed downward. It is composed of a second tilting portion 158b extending at an incline and a lower end portion 160b connected to the tamper evidence skirt 6, and the intermediate portion 156b has a thin portion 162b extending over the entire width in the circumferential direction. To do.

FIG. 6 also shows the mouth / neck portion 64 of the container together with the container lid 2. The mouth-and-neck portion 64 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. A male thread 66 and a locking protrusion 68 positioned below the male thread 66 are formed on the outer peripheral surface of the mouth and neck portion 64.

When the container lid 2 is attached to the mouth-and-neck portion 64 and the mouth-and-neck portion 64 is sealed, the container lid 2 is fitted on the mouth-and-neck portion 64 and is closed (clockwise as viewed from above in FIG. 6). The female thread 20 of the container lid 2 is screwed together with the male thread 66 of the mouth-and-neck part 64 by rotating. As the female thread 20 is engaged with the male thread 66, the container lid 2 gradually descends with respect to the mouth-and-neck portion 64. When the container lid 2 is lowered with respect to the mouth-and-neck portion 64 to the state shown in FIG. 6, the inner annular ridge 14 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. 16 are respectively brought into close contact with the inner peripheral surface and the outer peripheral surface of the mouth-and-neck portion 64, whereby the mouth-and-neck portion 64 is sealed. Locking means 34 disposed on the inner peripheral surface of the tamper evident bottom portion 6 of the container closure 2 is over the stopping projections 68 of the neck 64 elastically, to the lower surface of the engaging projection 68 It can be locked.

When the container lid 2 is rotated in the closing direction and attached to the mouth-and-neck portion 64, particularly when the locking means 34 gets over the locking ridge 68, it is caused by resistance to rotation acting on the tamper evidence skirt 6. Then, the tamper evidence skirt 6 is assumed to move relative to the main body 2 in the opening direction (counterclockwise as viewed from above in FIG. 6). However, in the container lid 2 configured according to the present invention, when the tamper evidence skirt 6 is slightly moved relative to the main body 2 in the opening direction, the guide formed on the tamper evidence skirt 6 is provided. The piece 48b comes into contact with the protruding piece 46 formed on the skirt wall 10 of the main body 2, thereby preventing relative movement of the tamper evidence skirt 6 with respect to the main body 2 in the opening direction. Therefore, it is sufficiently reliably avoided that the breakable bridge portion 26 is broken by excessive stress acting on the breakable bridge portion 26.

When opening the mouth and neck portion 64, the container lid 2 is rotated in the opening direction (counterclockwise as viewed from above in FIG. 6), and the female thread of the container lid 2 with respect to the male thread 66 of the mouth and neck portion 64 is rotated. The 20 screwing 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 skirt 6 is locked by the locking means 34 on the locking ridge 68 of the mouth and neck 64. As a result, the rise is prevented, and due to this, a considerable stress is generated in the breakable bridge 26 and the breakable bridge 26 is broken. After that, the main body 2 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. 7 together with FIG. 6, when the body 4 is gradually separated from the tamper evidence skirt 6 upwardly, the first tilting piece 54a of the non-breaking connecting piece 50a and the non-breaking The second tilting part 58b of the connecting piece 50b is pivoted counterclockwise in FIGS. 6 and 7 around the respective upper and lower ends, that is, tilted counterclockwise, while the second tilting of the non-breaking connecting piece 50a. The first tilting portion 54b of the piece 58a and the non-breaking connecting piece 50b is pivoted clockwise in FIGS. 6 and 7 around the lower end and the upper end, that is, tilted clockwise, and the non-breaking connecting piece accordingly. The inclination angle α of the first tilting parts 54a and 54b and the second tilting parts 58a and 58b at 50a and 50b with respect to the vertical line is gradually reduced. As clearly understood by referring to FIG. 8 together with FIGS. 6 and 7, when the female thread 20 of the container lid 2 is completely disengaged from the male thread 66 of the mouth and neck 64, the container The main body 4 of the lid 2 is detached from the mouth / neck portion 64. However, the main body 4 is separated from the container's mouth and neck 64 because it continues to be connected to the tamper evidence skirt 6 that is still attached to the mouth and neck 64 via the non-breaking connection pieces 50a and 50b. There is nothing.

  In the container lid 2 constructed in accordance with the present invention, the non-breaking connecting pieces 50a and 50b have two tilting portions whose tilt directions are opposite to each other, that is, the first tilting portion 54a and the second tilting portion 58a and the first tilting portion. 2 and the second tilted portion 58b, the circumferential dimension of the non-breaking connection variation 50a and 50b is relatively small. Is allowed to be spaced upwards over a substantial length. Therefore, even when the main body 2 needs to be lifted over a considerable length in order to detach the main body 2 from the mouth / neck portion 64, the main body 2 can be moved to the mouth / neck portion without causing any particular problem. 64 can be disengaged. In addition, the following facts should be noted in the container lid 2 constructed according to the present invention. That is, due to the resistance to rotation in the opening direction acting on the tamper evidence skirt 6, the tamper evidence skirt 6 is relative to the main body 2 in the closing direction (clockwise in FIGS. 6 and 7). I will move to. However, when the tamper evidence skirt 6 is slightly moved in the closing direction relative to the main body 2, the guide piece 48 a formed on the tamper evidence skirt 6 is formed on the skirt wall 10 of the main body 2. This prevents the tamper evidence skirt 6 from moving relative to the main body 2 in the closing direction. Therefore, it is sufficiently reliably avoided that excessive stress acts on the non-breaking connection pieces 50a and 50b and the non-breaking connection pieces 50a and 50b are broken.

After the main body 4 of the container lid 2 is detached from the mouth-and-neck portion 64, the thin-walled portions 62a and 62b of the non-breaking connection pieces 50a and 50b are used as hinge fulcrums in the direction of moving away from the mouth-and-neck portion 64 in FIG. To the state shown in FIG. Thus, the lower end (tip end) outer surface of the projecting piece 46 formed on the main body 4 abuts on the upper surface of the locking projection 68 of the mouth and neck, and the step formed on the outer surface of the projecting piece 46. 47 is locked to the lower surface of the locking protrusion 68, and the lower end of the skirt wall 10 of the main body 4 abuts on the outer peripheral surface of the tamper evidence skirt 6 so that the main body 4 is in the position shown in FIG. It is held releasably. 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 eating and drinking of the contents is interrupted in the middle, the main body 4 held at the position shown in FIG. 8 is turned in the direction approaching the mouth and neck portion 64 and is fitted on the mouth and neck portion 64 again. The container lid 2 is rotated in the closing direction so that the female thread 20 of the container lid 2 is screwed into the male thread 66 of the mouth-and-neck portion 64, and thus the container lid 2 is positioned again in the state shown in FIG. The neck 64 can be temporarily sealed.

The slope view which shows suitable embodiment of the container lid comprised according to this invention. The front view of the container lid of FIG. The front view which shows a part of container lid of FIG. 1 in a cross section. The fragmentary sectional view which shows the protrusion piece in the container lid of FIG. The partial front view which shows the modification of the non-breaking connection piece in 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. FIG. 1 is a front view partially showing a cross-section of an intermediate state of an unsealing operation in which the main body of the container lid is lifted by rotating the main body in the opening direction in order to detach the main body of the container lid from the mouth and neck of the container. The front view which shows the state which removed the main body of the container lid of FIG. 1 from the mouth neck part of the container, and was hold | maintained in the predetermined position.

Explanation of symbols

2: Container lid 4: Main body 6: Tamper evidence hem 8: Top wall 10: Skirt wall 20: Female thread 26: Breakable bridge 34: Locking means 46: Projection piece 48a: Guide piece 48b: Guide Piece 50a: Non-breaking connecting piece 50b: Non-breaking connecting piece 54a: First tilting portion 54b: First tilting portion 58a: Second tilting portion 58b: Second tilting portion 62a: Thin-walled portion 62b: Thin-walled portion 64 : Mouth and neck 66: male thread 68: locking protrusion 150a: non-breaking connecting piece 150b: non-breaking connecting piece 154a: first tilting part 154b: first tilting part 158a: second tilting part 158b: Second tilting part 162a: thin part 162b: thin part

Claims (4)

A synthetic resin container lid applied to a container in which a male thread and a locking projection located below the male thread are formed on the outer peripheral surface of the mouth and neck, the top wall and the top wall A cylindrical skirt wall that hangs down from the peripheral edge of the skirt wall, and an inner peripheral surface of the skirt wall is provided with a main body formed with a female thread that is screwed to the male thread, and is spaced apart in the circumferential direction. A cylindrical shape that is connected to the skirt wall of the main body through a plurality of breakable bridging portions, and is provided with a locking means that is locked to the locking protrusion on the inner peripheral surface. The skirt wall of the main body is provided with projecting pieces protruding downward, and the skirt wall of the main body and the tamper shrimp are disposed on both sides in the circumferential direction of the projecting piece. When the main body is moved upward with respect to the tamper evidence hem and connected to the dent hem, In the synthetic resin container closure unbroken connecting pieces are disposed with a tilt portion inclination angle is gradually made to decrease to,
One of the non-breaking connecting pieces is inclined downward or extends substantially horizontally horizontally to one side in the circumferential direction, and the lower part of the first inclined part follows the first inclined part . has a second tilting portion extending inclined or substantially horizontally circumferentially other side to the other of the non-broken connection piece is inclined downward or substantially horizontally said circumferential direction other second tilting portion extending in the first tilting portion and inclined to or substantially horizontally said circumferential side toward the lower side of the first tilting portion downward following the tilting portion of the first extending side A synthetic resin container lid characterized by comprising: The synthetic resin container lid according to claim 1, wherein the first tilting portion and the second tilting portion in each of the fractured connection pieces are connected via a thin-walled portion.   The tamper evidence skirt is provided with guide pieces that protrude upward between the protruding piece and the non-breaking connecting piece in the circumferential direction, and are respectively positioned near both side edges of the protruding piece. The synthetic resin container lid according to claim 1 or 2.   The synthetic resin container lid according to claim 3, wherein a circumferential interval between the protruding piece and the guide piece is 0.3 to 1.0 mm.

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