JP5520768B2 - 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 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 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. Connected to the skirt wall of the main body through the formed main body and a plurality of breakable bridging portions arranged at intervals in the circumferential direction, and the locking jaw portion of the mouth and neck portion on the inner peripheral surface 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 tamper evidence skirt elastically moves over the locking jaw 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 in response to the release of the screwing, but the tamper evidence hem is raised because the locking means is locked to the locking jaw of the mouth and neck. It is blocked and therefore stress is generated in the breakable bridge and the breakable bridge 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 main body is removed from the mouth and neck, the main body is swung around the required part of the non-breaking connection piece and is displaced from the mouth and neck of the container to one side. Continued to be attached to the neck, the body continues to be connected to the tamper evidence skirt via a non-breaking connection piece and thus is not separated from the container. If the consumption of the container is interrupted when it is partially consumed, not the whole, the main body is swung in the opposite direction to the swiveling direction when opening with the required part of the non-breaking connecting piece as the swivel center Attach it to the mouth and neck of the container, then rotate the container lid in the closing direction and re-engage the female thread of the container lid with the male thread of the mouth and neck, thus temporarily sealing the mouth and neck be able to.

  Furthermore, Patent Document 2 listed below discloses, as an improvement of the above-mentioned synthetic resin container lid, that each non-breaking connecting piece includes two tilting portions whose tilting directions are opposite to each other.

JP 2008-56246 A JP 2010-18290 A

  However, according to the experience of the present inventors, the container lid made of the synthetic resin as described above, the main body of the container lid is detached from the mouth and neck of the container, and then swiveled around the required portion of the non-breaking connecting piece as a pivot center. After displacing from the mouth and neck of the container, swivel the body in the opposite direction to the swivel direction when opening with the required part of the non-breaking connection piece as the pivot center for temporary sealing of the mouth and neck It has been found that there is a case where the main body cannot be fitted onto the mouth and neck sufficiently smoothly when fitted onto the mouth and neck.

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that the main body is placed in a turning direction when opening with the required portion of the non-breaking connecting piece as a turning center for temporary sealing of the mouth and neck. In contrast, by providing a new and improved synthetic resin container lid that can be fitted in the mouth and neck part sufficiently smoothly when it is turned in the opposite direction and fitted in the mouth and neck part. is there.

  As a result of intensive studies and experiments, the present inventor has found that in the conventional container lid, the screwing start tip, that is, the lower end of the female thread formed on the inner peripheral surface of the skirt wall is the turning base point of the main body in the circumferential direction, that is, It is positioned at or near the turning tip angular position displaced by 180 degrees with respect to the circumferential center of the protruding piece. Therefore, depending on the relative angular positional relationship between the mouth neck of the container and the container lid, the main body may be When it is swung in the opposite direction and fitted to the mouth and neck of the container, it is formed on the screw thread start point of the female thread formed on the inner peripheral surface of the skirt wall, that is, the lower end and the outer peripheral surface of the mouth and neck. It has been recognized that the threaded start end, i.e., the upper end, of the male thread is interfering, and this interference hinders smooth fitting of the main body to the mouth and neck. And based on such recognition, when the screwing start tip of the female thread is positioned in a specific angle region with respect to the circumferential center of the protruding piece, and when the container lid body is detached from the mouth and neck of the container, It has been found that the main technical problem can be achieved by configuring the main body to be somewhat displaced with respect to the mouth and neck of the container in the direction in which the screwing start tip of the female thread is located. In order for the main body of the container lid to be displaced from the mouth and neck of the container, the main body is somewhat displaced in the required direction with respect to the mouth and neck of the container. It has one of a clockwise tilting portion and a counterclockwise tilting portion that tilts clockwise when it is separated upward from the hem of the evidence, and the other does not exist or has an extension length on the other It has been found that a shorter form may be used.

That is, according to one aspect of the present invention, as a synthetic resin container lid that achieves the main technical problem, a male thread on the outer peripheral surface of the mouth and neck and a locking jaw positioned below the male thread. A synthetic resin container lid applied to a container in which a portion is formed, and has a top wall and a cylindrical skirt wall depending from the periphery of the top wall, and the male wall is provided on the inner peripheral surface of the skirt wall. Connected to the skirt wall of the main body through a main body in which a female thread to be screwed into the thread is formed, and a plurality of breakable bridge portions arranged at intervals in the circumferential direction; The inner peripheral surface includes a cylindrical tamper-evidence hem portion provided with locking means to be locked to the locking jaw, and a protruding piece protruding downward is formed on the skirt wall of the main body. The skirt wall and the tamper evidence hem of the main body are disposed on both sides in the circumferential direction of the projecting piece. And a non-breaking connecting piece having a tilting portion in which an 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. In the container lid,
The threading start tip of the female thread is positioned in the range of 45 degrees to 135 degrees clockwise from the center of the protruding piece as viewed from above,
The non-breaking connecting piece has a clockwise tilting portion that is tilted clockwise when the main body is moved upward with respect to the tamper evidence skirt, and the main body is positioned with respect to the tamper evidence skirt. There is no counterclockwise tilting portion that can be tilted counterclockwise when moved upward, or the extension length is shorter than the extension length of the clockwise tilting portion even if it exists.
A synthetic resin container lid is provided.

Preferably, the non-breaking connecting piece positioned on the clockwise side of the protruding piece as viewed from above has the counterclockwise tilting portion whose extension length is shorter than the extension length of the clockwise tilting portion. In a preferred embodiment, in the non-breaking connecting piece located on the clockwise side of the projecting piece when viewed from above, the counterclockwise tilting portion is opposite from the one end connected to the tamper evidence skirt portion when viewed from above. Extending clockwise, an intervening portion is connected to the other end of the counterclockwise tilting portion, and the clockwise tilting portion extends clockwise from one end connected to the interposing portion when viewed from above. The other end of the tilting part is connected to the skirt wall,
In the non-breaking connecting piece located on the counterclockwise side of the protruding piece when viewed from above, the clockwise tilting portion extends clockwise from one end connected to the tamper evidence skirt, An interposition part is connected to the other end of the clockwise tilting part, and the interposition part is directly connected to the skirt wall.

According to another aspect of the present invention, as a synthetic resin container lid that achieves the main technical problem described above, a male thread on the outer peripheral surface of the mouth and neck and a locking jaw part located below the male thread A synthetic resin container lid applied to a container formed with a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall. Connected to the skirt wall of the main body through a main body in which a female thread is formed to be screwed to the strip, and a plurality of breakable bridges arranged at intervals in the circumferential direction. The peripheral surface includes a cylindrical tamper-evidence hem portion provided with locking means to be locked to the locking jaw, and a protruding piece protruding downward is arranged on the skirt wall of the main body. Provided on both sides in the circumferential direction of the projecting piece, and A synthetic resin container lid provided with a non-breaking connecting piece having a tilting portion that is connected and has a tilting angle that gradually decreases with respect to a vertical line when the main body is moved upward with respect to the tamper evidence skirt. In
The screwing start tip of the female thread is positioned in the range of 45 to 135 degrees counterclockwise from the center of the protruding piece as viewed from above.
The non-breaking connecting piece has a counterclockwise tilting portion that is tilted counterclockwise when the main body is moved upward with respect to the tamper evidence skirt, and There is no clockwise tilting part that is tilted clockwise when the main body is moved upward, or the extension length is shorter than the extension length of the counterclockwise tilting part even if it exists.
A synthetic resin container lid is provided.

Preferably, the non-breaking connecting piece located on the counterclockwise side of the protruding piece as viewed from above has the clockwise tilting portion whose extension length is shorter than the extension length of the counterclockwise tilting portion. In a preferred embodiment, in the non-breaking connecting piece positioned on the counterclockwise direction of the protruding piece when viewed from above, the clockwise tilting portion is a clock when viewed from above from one end connected to the tamper evidence skirt. An intervening portion is connected to the other end of the clockwise tilting portion, and the counterclockwise tilting portion extends counterclockwise as viewed from above from one end connected to the interposing portion. The other end of the direction tilting part is connected to the skirt wall;
In the non-breaking connecting piece located on the clockwise side of the projecting piece when viewed from above, the counterclockwise tilting portion extends counterclockwise when viewed from above from one end connected to the tamper evidence skirt, An interposition part is connected to the other end of the counterclockwise tilting part, and the interposition part is directly connected to the skirt wall.

  In the synthetic resin container lid provided by the first aspect of the present invention, in order to open the mouth and neck of the container, the container lid is rotated in the opening direction and the breakable bridging portion is broken, and then the tamper evidence When the main body is separated upward with respect to the hem, the main body is moved relative to the mouth and neck of the container and the tamper evidence hem due to the clockwise tilt of the non-breaking connecting piece being tilted clockwise. And biased in a predetermined direction, that is, a direction displaced counterclockwise as viewed from above with respect to the center of the protruding piece. However, the displacement of the body is blocked by the mouth and neck, which causes the unbroken piece to be elastically deformed and somewhat plastically deformed. When the main body is detached from the mouth and neck of the container, the elastic deformation of the non-breaking connecting piece is released, but the plastic deformation remains as it is. Due to this plastic deformation, the main body of the container is somewhat displaced in the clockwise direction when viewed from above with respect to the center of the protruding piece, that is, in the direction in which the screwing start tip of the female thread is located. The threading start tip of the strip is somewhat displaced radially outward from the male thread formed on the mouth neck of the container, and thus the threading start tip of the female thread and the threading start tip of the male thread Even if they are in an angularly aligned state, it is sufficiently reliably avoided that the smooth fitting of the main body to the mouth and neck of the container is hindered by the interference between the two.

  Similarly, in the synthetic resin container lid provided by another aspect of the present invention, the container lid is rotated in the opening direction in order to open the mouth and neck of the container, and the tamperable bridging portion is broken. When the main body is separated upward from the bottom of the evidence, the counterclockwise tilting portion of the non-breaking connecting piece is tilted counterclockwise, so that the main body is the container neck and tamper evidence. It is urged in a predetermined direction with respect to the skirt portion, that is, a direction displaced clockwise from the upper side with respect to the center of the protruding piece. However, the displacement of the body is blocked by the mouth and neck, which causes the unbroken piece to be elastically deformed and somewhat plastically deformed. When the main body is detached from the mouth and neck of the container, the elastic deformation of the non-breaking connecting piece is released, but the plastic deformation remains as it is. Due to this plastic deformation, the main body of the container is somewhat displaced in the counterclockwise direction when viewed from above with respect to the center of the protruding piece, that is, in the direction in which the screwing start tip of the female thread is located. The threading start tip of the thread is somewhat displaced radially outward from the male thread formed on the mouth and neck of the container, and thus the threading start tip of the female thread and the threading start tip of the male thread Even if they are in an angularly aligned state, it is sufficiently reliably avoided that the smooth fitting of the main body to the mouth and neck of the container is hindered by the interference between the two.

The front view which shows suitable embodiment of the synthetic resin container lid comprised according to this invention. FIG. 2 is a front view partially showing a cross-section of a state in which the container lid illustrated in FIG. 1 is attached to the mouth and neck of the container and the mouth and neck are sealed. The front view which shows the state which rotated the container lid somewhat in the opening direction in order to open the mouth neck part from the state illustrated in FIG. The front view which shows the state which rotated the container lid further in the opening rotation direction from the state shown in FIG. 3, and removed the main body of the container lid from the mouth neck part of the container. The top view which shows the state of FIG. The side view which shows the state which turned the main body of the container lid removed from the mouth neck part of the container to the required position.

  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 and 2 illustrating a preferred embodiment of a synthetic resin container lid constructed in accordance with the present invention, an injection molding (or compression molding) from a suitable synthetic resin such as polyethylene or polypropylene will be described. A container lid, generally designated 2, that can be conveniently 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.

  The description will be continued 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 sectional view. Has been. The main portion 18 of the outer peripheral surface of the skirt wall 10 is suspended substantially vertically, and the lower end portion 19 of the skirt wall 10 extends obliquely outward in the radial direction and then extends substantially downward. It extends vertically. 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 positioned between the ridge portions. Has been. A female thread 22 is formed on the inner peripheral surface of the skirt wall 10. It is important that the threading start tip (that is, the lower end) of the female thread 22 is positioned in a range of 45 degrees to 135 degrees in a clockwise direction from the center of a protruding piece, which will be described later, as viewed from above (that part The reason will be detailed later).

  1 and 2, the tamper evidence skirt 6 has a cylindrical shape as a whole, and includes a plurality of breakable bridging portions 24 (of which, 1 is connected to the skirt wall 10 of the main body 4 via the one shown in FIG. The breakable bridge portion 24 may be substantially the same as the breakable bridge portion disclosed in Japanese Patent Application Laid-Open No. 2007-191206, the upper end portion is connected to the lower end portion of the inner peripheral surface of the skirt wall 10, and the lower end portion is a tamper. It is connected to the upper end of the inner peripheral surface of the evidence skirt 6. Locking means 26 is disposed on the inner peripheral surface of the tamper evidence skirt 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. Each of the stopper pieces is inclined inward in the radial direction from the inner peripheral surface of the tamper evidence skirt 6 and extended upward.

  1, the lower end edge of the skirt wall 10 of the main body 4 is displaced above the lower end edge of the other area in the region indicated by the numeral 28, and the tamper evidence skirt 6 is provided in the area indicated by the numeral 30. The upper edge is displaced below the upper edge of the other region, and in the middle of regions 28 and 30, the upper edge of the tamper evidence skirt 6 is displaced somewhat further downward, and the skirt An opening 32 is created between the wall 10 and the tamper evidence skirt 6. A substantially rectangular protruding piece 34 that protrudes downward is formed on the skirt wall 10 at the circumferential center of the opening 32.

  As clearly shown in FIG. 1, non-breaking connection pieces 36 a and 36 b located on both sides of the protruding piece 34 are further disposed in the opening 32. In the illustrated embodiment, the 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 connected to the tamper evidence skirt 6 from one end to the right in FIG. Counterclockwise tilting portion 38a extending substantially horizontally (counterclockwise as viewed from above), an interposition portion 40a connected to the other end of the counterclockwise tilting portion 38a, and one end connected to the interposition portion 40a 1 extends substantially horizontally to the left (clockwise as viewed from above), and the other end includes a clockwise tilting portion 42 a connected to the skirt wall 10. The extending length L1 of the clockwise tilting portion 42a is larger than the extending length L2 of the counterclockwise tilting portion 38a, in other words, the extending length L2 of the counterclockwise tilting portion 38a is the clockwise tilting portion 42a. It is important that it is smaller than the extended length L1. The 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 viewed from the left end (viewed from above) in FIG. It comprises a clockwise tilting portion 38b extending substantially horizontally (clockwise) and an interposition portion 40b connected to the other end of the clockwise tilting portion 38b. The non-breaking connection piece 36b does not include a counterclockwise tilting portion, and the interposition portion 40b is directly connected to the skirt wall 10. If desired, a counterclockwise tilting portion having an extension length smaller than the extension length of the clockwise tilting portion 38b can be provided. Further, the counterclockwise tilt portion 38a can be tilted upward in the right direction in FIG. 1, and the clockwise tilt portions 42a and 38b can be tilted upward in the left direction in FIG.

  Continuing the description with reference to FIG. 2, the mouth-and-neck portion 50 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 part 50, a male thread 52 and a locking jaw part 54 positioned below the male thread 52 are formed. The male thread 52 has a recess 56 (see FIG. 6) in a required angle region in order to form a so-called air passage.

  When the container lid 2 is attached to the mouth-and-neck portion 50 and the mouth-and-neck portion 50 is sealed, the container lid 2 is fitted on the mouth-and-neck portion 50 and closed (clockwise as viewed from above in FIG. 2). The female thread 22 of the container lid 2 is screwed together with the male thread 52 of the mouth and neck portion 50 by rotating. The container lid 2 gradually descends with respect to the mouth-and-neck portion 50 as the female screw 22 is engaged with the male screw 52. When the container lid 2 is lowered with respect to the mouth-and-neck portion 50 to the state shown in FIG. 2, 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 is brought into close contact with the inner and outer peripheral surfaces of the mouth-and-neck portion 50, whereby the mouth-and-neck portion 50 is sealed. The locking means 26 disposed on the inner peripheral surface of the tamper evidence skirt 6 of the container lid 2 elastically climbs over the locking jaw 54 of the mouth-and-neck 50 and is below the locking jaw 54. To position.

  When opening the mouth-and-neck portion 50, the container lid 2 is rotated in the opening direction (counterclockwise as viewed from above in FIG. 2), and the female thread of the container lid 2 with respect to the male thread 52 of the mouth-and-neck portion 50 is rotated. 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 skirt 6 is locked by the locking means 26 to the locking jaw 54 of the mouth and neck 50. As a result, the rise is prevented, and due to this, a considerable stress is generated in the breakable bridge portion 24, and the breakable bridge 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 skirt 6. As clearly understood by referring to FIG. 3 in conjunction with FIGS. 1 and 2, when the body 4 is gradually separated from the tamper evidence skirt 6 upwardly, the counterclockwise tilting portion 38a of the non-breaking connecting piece 36a is obtained. Is pivoted counterclockwise, and the clockwise tilting portion 42a of the non-breaking connection piece 36a and the clockwise tilting portion 38b of the non-breaking connection portion 36b are swung clockwise, and in response thereto, the counterclockwise tilting portion 38a, The inclination angle α of the direction tilting part 42a and the clockwise tilting part 38b with respect to the vertical line is gradually reduced. At this time, the extension length of the clockwise tilting portion 42a is larger than the extension length of the counterclockwise tilting portion 38a in the non-breaking connection portion 36a, and the counterclockwise tilting in the non-breaking connection portion 36b. Due to the absence of the portion, the body 4 of the container lid 2 is subjected to a force acting on the left side in FIG. 3 (counterclockwise as viewed from above). 50, and therefore, a tensile stress is generated in the clockwise tilt part 42a and the clockwise tilt part 38b, and the clockwise tilt part 42a and the clockwise tilt part 38b are somewhat elastically deformed and somewhat. Plastically deformed. When the rotation of the main body 2 in the opening direction proceeds and the screwing of the female thread 22 of the container lid 2 with respect to the male thread 52 of the mouth-and-neck part 50 is completely released, the main body 4 is detached from the mouth-and-neck part 50. Is done. However, because the body 4 continues to be connected to the tamper evidence skirt 6 that is still attached to the mouth / neck 50 via the non-breaking connections 36a and 36b, it is separated from the mouth / neck 50 of the container. There is nothing. As clearly understood by comparing FIG. 3 and FIG. 4 and referring to FIG. 5, when the main body 4 is detached from the mouth and neck portion 50 and the restraint of the main body 4 by the mouth and neck portion 50 is released, The elastic deformation of the clockwise tilting part 42a and the clockwise tilting part 38b is elastically restored, but the plastic deformation remains as it is, so that the main body 4 is in contact with the mouth / neck part 50 and the tamper evidence skirt part 6. 3 and 5, it is displaced to the left (clockwise as viewed from above). In FIG. 5, the lower end of the skirt wall 10 of the main body 4 after the main body 4 is detached from the mouth and neck portion 50 is indicated by a solid line X, and the skirt wall of the main body 4 before the main body 4 is detached from the mouth and neck portion 50. The lower end of 10 is indicated by a two-dot chain line Y. By comparing the solid line X and the two-dot chain line Y, the above-described displacement of the main body 4 can be clearly understood.

  After the main body 4 of the container lid 2 is detached from the mouth-and-neck portion 50, the connection region between the non-breaking connection portions 36a and 36b and the tamper evidence skirt portion 10, and thus one end of the counterclockwise tilting portion 38a and the clockwise direction. The main body 4 is swung to the state illustrated in FIG. 6 in a direction away from the mouth-and-neck portion 50 around one end of the tilting portion 38b. Thus, the outer surface of the lower end portion (tip portion) of the projecting piece 34 formed on the main body 4 abuts on the upper surface of the locking jaw portion 54 of the mouth and neck portion, and the lower end of the skirt wall 10 of the main body 4 is the tamper evidence. The main body 4 is held in a releasable position at a 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 eating and drinking of the contents is interrupted halfway, the main body 4 held at the position shown in FIG. 6 is turned counterclockwise in FIG. 2 is rotated in the closing direction so that the female thread 22 of the container lid 2 is screwed into the male thread 52 of the mouth-and-neck section 50, and the container lid 2 is positioned again in the state shown in FIG. 50 can be temporarily sealed

  Thus, in the container lid 2 configured according to the present invention, the screwing start tip of the female thread 22 formed on the inner peripheral surface of the skirt wall 10 of the main body 4 is the protrusion piece 34 as viewed from above. It is positioned in the range of 45 to 135 degrees from the center, that is, in the angle region indicated by Z in FIGS. The main body 4 once detached from the mouth / neck portion 50 is displaced leftward in FIGS. 4 and 5. Therefore, as clearly understood by referring to FIGS. 4 and 5, the screwing start tip of the female thread 22 is displaced slightly outward in the radial direction with respect to the mouth-and-neck portion 50. Therefore, even if the screwing start tip of the female screw 22 and the screwing start tip of the male screw 52 are angularly aligned with each other, the smooth fitting of the main body 4 with respect to the mouth-and-neck portion 50 due to the interference therebetween. Is sufficiently reliably avoided.

  In the embodiment described above, the screwing start tip of the female thread 22 is positioned in the range of 45 degrees to 135 degrees in the clockwise direction from the center of the protruding piece 34 when viewed from above, and in the non-breaking connection pieces 36a and 36b, When the main body 4 is moved upward with respect to the tamper evidence skirt 6, there is no counterclockwise tilting portion that tilts counterclockwise or the extension length of the clockwise tilting portion extends. Although the length is shorter than the length, the relationship between the clockwise direction and the counterclockwise direction is completely reversed with respect to such an embodiment, and the center of the protruding piece is viewed from the top of the female thread starting from above. In the non-breaking connection piece, the clockwise tilting portion that is tilted clockwise when the main body is moved upward with respect to the tamper evidence hem portion is positioned in the range of 45 to 135 degrees counterclockwise from Exists Extending lengths also have or be present exactly same effect even shorter than the extending length of the counterclockwise tilting part is achieved.

Ten container lids of the form shown in FIGS. 1 to 6 for a container made of polyethylene terephthalate having a mouth and neck part with a nominal diameter of 28 mm were made from polyethylene by injection molding. Extending lengths in the cross-sectional area of 0.77 mm ² in the counterclockwise direction tilting unit in unbroken connecting pieces located on the clockwise side of the projecting piece as viewed from above in 2.10 mm, the cross-sectional area of the clockwise tilting unit Is 0.83 mm ² and has an extended length of 4.20 mm. The cross-sectional area of the clockwise tilting portion of the non-breaking connecting piece located on the counterclockwise side of the protruding piece when viewed from above is 0.77 mm ² . The length was 4.20 mm. Attach such a container lid to the mouth and neck of the container as required, and then rotate the container lid in the opening rotation direction to break the breakable bridging part and remove the main body from the mouth and neck, from above. As a result of measuring the amount of displacement of the lower end of the skirt wall of the main body radially outward compared to the state before the lower end of the skirt wall of the main body was detached from the mouth and neck at an angular position of 90 degrees from the protruding piece, The minimum displacement was 0.70 mm, the maximum displacement was 0.88 mm, and the average displacement was 0.80 mm.

2: Container lid 4: Main body 6: Tamper evidence hem 8: Top wall 10: Skirt wall 22: Female thread 24: Breakable bridge 26: Locking means 34: Protruding piece 36a: Non-breaking connecting piece 36b : Non-breaking connecting piece 38a: Counterclockwise tilting part 40a: Interposition part 42a: Clockwise tilting part 38b: Clockwise tilting part 40b: Interposition part 50: Mouth neck part 52: Male thread 54: Locking jaw part 52: Starting point of rotation (the center of the protruding piece in the circumferential direction)
54: Starting point of female thread

Claims (6)

A synthetic resin container lid applied to a container in which a male thread and a locking jaw part positioned below the male thread are formed on an 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 jaw 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. Connected to the dent hem and vertically moved when the body is moved upward relative to the tamper evidence hem. In the synthetic resin container closure unbroken connecting pieces are disposed with a tilt portion inclination angle is gradually made to decrease with respect to,
The threading start tip of the female thread is positioned in the range of 45 degrees to 135 degrees clockwise from the center of the protruding piece as viewed from above,
The non-breaking connecting piece has a clockwise tilting portion that is tilted clockwise when the main body is moved upward with respect to the tamper evidence skirt, and the main body is positioned with respect to the tamper evidence skirt. There is no counterclockwise tilting portion that can be tilted counterclockwise when moved upward, or the extension length is shorter than the extension length of the clockwise tilting portion even if it exists.
A synthetic resin container lid.   The non-breaking connecting piece located on the clockwise side of the projecting piece when viewed from above has the counterclockwise tilting portion whose extension length is shorter than the extension length of the clockwise tilting portion. Synthetic resin container lid. In the non-breaking connecting piece located on the clockwise side of the projecting piece when viewed from above, the counterclockwise tilting portion extends in a counterclockwise direction when viewed from above from one end connected to the tamper evidence skirt, An intervening portion is connected to the other end of the counterclockwise tilting portion, and the clockwise tilting portion extends clockwise from one end connected to the interposing portion when viewed from above, and the other end of the clockwise tilting portion. Is connected to the skirt wall,
In the non-breaking connecting piece located on the counterclockwise side of the protruding piece when viewed from above, the clockwise tilting portion extends clockwise from one end connected to the tamper evidence skirt, The synthetic resin container lid according to claim 2, wherein an interposition part is connected to the other end of the clockwise tilting part, and the interposition part is directly connected to the skirt wall. A synthetic resin container lid applied to a container in which a male thread and a locking jaw part positioned below the male thread are formed on an 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 jaw 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. Connected to the dent hem and vertically moved when the body is moved upward relative to the tamper evidence hem. In the synthetic resin container closure unbroken connecting pieces are disposed with a tilt portion inclination angle is gradually made to decrease with respect to,
The screwing start tip of the female thread is positioned in the range of 45 to 135 degrees counterclockwise from the center of the protruding piece as viewed from above.
The non-breaking connecting piece has a counterclockwise tilting portion that is tilted counterclockwise when the main body is moved upward with respect to the tamper evidence skirt, and There is no clockwise tilting part that is tilted clockwise when the main body is moved upward, or the extension length is shorter than the extension length of the counterclockwise tilting part even if it exists.
A synthetic resin container lid.   5. The non-breaking connecting piece located on the counterclockwise side of the protruding piece when viewed from above has the clockwise tilting portion whose extension length is shorter than the extension length of the counterclockwise tilting portion. The synthetic resin container lid as described. In the non-breaking connecting piece located on the counterclockwise side of the projecting piece when viewed from above, the clockwise tilting portion extends clockwise from one end connected to the tamper evidence skirt, An intervening portion is connected to the other end of the clockwise tilting portion, and the counterclockwise tilting portion extends counterclockwise as viewed from above from one end connected to the intervening portion. The end is connected to the skirt wall;
In the non-breaking connecting piece located on the clockwise side of the projecting piece when viewed from above, the counterclockwise tilting portion extends counterclockwise when viewed from above from one end connected to the tamper evidence skirt, The synthetic resin container lid according to claim 5, wherein an interposition part is connected to the other end of the counterclockwise tilting part, and the interposition part is directly connected to the skirt wall.

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