JP2011173600A - Synthetic resin container cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constantly fit a body to a mouth neck part in a fully smooth manner when fitting the body to the mouth neck part by turning the body in the opposing direction to the turning direction during the unsealing with a requested part of a non-cut connection piece as a turning center for temporary sealing of the mouth neck part in a synthetic resin container cap of the type in which a body (4) and a tamper-evident skirt part (6) connected to the body via a plurality of cuttable bridging parts (22) arranged circumferentially with the spacing are included, and even if the bridging parts are cut, and the body is detached from a mouth neck part (46) of the container, the body is continuously connected to the tamper-evident skirt parts to be continuously attached to the mouth neck part of the container via non-cut connection pieces (34a, 34b). <P>SOLUTION: A thread-engagement starting end (54) of female threads (20) formed in the inner circumferential surface of a skirt wall (10) is located at an area of the predetermined angle relative to a turning base point (52) of the body. <P>COPYRIGHT: (C)2011,JPO&INPIT

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 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 jaw 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 main body is detached 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.

JP 2008-56246 A

  Furthermore, the inventors of the present invention, as an improvement of the above-described synthetic resin container lid, previously made Japanese Patent Application No. 2008-178225 into a configuration in which each of the non-breaking connecting pieces includes two tilting portions whose tilting directions are opposite. Proposed that.

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

  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 end, that is, the lower end of the female thread formed on the inner peripheral surface of the skirt wall is the turning base point ( It is positioned at or near the turning tip angular position displaced by 180 degrees with respect to the circumferential direction of the protruding piece). Therefore, depending on the relative angular position relationship between the mouth neck of the container and the container lid, When it is swung in the opposite direction and fitted onto the mouth and neck of the container, it is formed at the screwing start end 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, that is, the upper end of the male thread is interfering, and this interference hinders smooth fitting of the main body to the mouth and neck. Based on this recognition, the main technical problem is solved by positioning the screwing start end of the female thread formed on the inner peripheral surface of the skirt wall in a predetermined angle region with respect to the turning base point of the main body. I found that I can achieve it.

That is, according to the present invention, as a synthetic resin container lid that achieves the above technical problem, 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 synthetic resin container lid applied to a container having a top surface wall and a cylindrical skirt wall depending from the periphery of the top surface wall, the inner surface of the skirt wall being threaded on the male thread. Connected to the skirt wall of the main body through a main body in which female threads to be fitted are formed and a plurality of breakable bridging portions arranged at intervals in the circumferential direction, 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 provided on the skirt wall of the main body. 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; In the synthetic resin container closure unbroken connecting pieces are disposed with a tilt portion inclination angle with respect to a vertical line when the body is moved upward is gradually made to decrease with respect to the tamper evident bottom portion,
The screwing start end of the female thread formed on the inner peripheral surface of the skirt wall is positioned in an angle region within ± 90 degrees with respect to the circumferential center of the protruding piece. A synthetic resin container lid is provided.

  It is preferable that the screwing start end of the female thread formed on the inner peripheral surface of the skirt wall is positioned in an angle region within ± 45 degrees with respect to the circumferential center of the protruding piece. In an angular region of ± 30 degrees, particularly an angular region of ± 40 degrees with respect to the turning tip angular position spaced 180 degrees in the circumferential direction with respect to the circumferential center of the protruding piece, the female thread is continuous. It is preferred that it is notched or has a reduced thread height.

  In the synthetic resin container lid of the present invention, regardless of the angular relationship of the container lid with respect to the mouth and neck of the container, the screwing start end of the female thread is the screw of the male thread at the turning tip angular position. The direction of swiveling when opening the main body as a swiveling center around the required part of the non-breaking connecting piece is limited to a range where it does not interfere with the joint start end or the degree of interference is small. When the body is turned in the opposite direction and fitted to the mouth and neck, the main body can always be fitted to the mouth and neck sufficiently smoothly.

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 fragmentary sectional view which shows the protrusion piece of the container lid shown in FIG. 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. FIG. 5 is a front view illustrating a state in which the container lid is further rotated in the opening rotation direction from the state illustrated in FIG. Sectional drawing along line VI-VI of FIG. The expanded view which shows the internal thread in the container lid shown in FIG. The expanded view which shows the external thread in the mouth neck part of the container illustrated in FIG. FIG. 6 is a cross-sectional view for explaining a relationship between a female thread and a male thread when the main body of the container lid is turned from the position illustrated in FIG. 5 and fitted to the mouth and neck of the container. Sectional drawing similar to FIG. FIG. 7 is a cross-sectional view similar to FIG. 6 showing a container lid whose female thread arrangement is not improved according to the present invention. The expanded view which shows the internal thread in the container lid shown in FIG. Sectional drawing for demonstrating the relationship between the internal thread and the external thread at the time of turning the main body in the container lid of FIG. 11 and fitting to the mouth neck part of a container. Sectional drawing similar to FIG.

  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 13 of the outer peripheral surface of the skirt wall 10 is suspended substantially vertically, and the lower end portion 15 of the skirt wall 10 extends in a radially outwardly inclined manner and then substantially extends downward. It extends vertically. The main portion 13 on the outer peripheral surface of the skirt wall 10 is formed with a knurl 18 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. The cross-sectional shape of the ridge is a substantially isosceles triangle. A female thread 20 is formed on the inner peripheral surface of the skirt wall 10 (the female thread 20 will be described in detail later).

  1 and 2, the tamper evidence skirt 6 has a cylindrical shape as a whole, and includes a plurality of breakable bridging portions 22 (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 22 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 24 is disposed on the inner peripheral surface of the tamper evidence skirt 6. The locking means 24 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 and 2, the lower end edge of the skirt wall 10 of the main body 4 is displaced upward from the lower end edge of the other region, and the upper end edge of the tamper evidence skirt 6 is The upper edge of the tamper evidence skirt 6 is further displaced further downward in the center of the region 26, and the skirt wall 10 and the tamper shrimp are further displaced below the upper edge of the other region. Between the dent skirt 6, a substantially horizontally long rectangular opening 28 is generated in the front view. A substantially rectangular projecting piece 30 projecting downward is formed on the skirt wall 10 at the center in the circumferential direction of the opening 28. As clearly understood by referring to FIG. 3, the protruding piece 30 hangs down substantially vertically, and then hangs down substantially vertically after being slightly displaced radially outward, and has a stepped portion on its outer surface. 32 is formed.

  As clearly shown in FIGS. 1 and 2, non-breaking connection pieces 34 a and 34 b located on both sides of the protruding piece 30 are further disposed in the opening 28. The non-breaking connection piece 34a in the illustrated embodiment is substantially horizontally disposed on the upper end 36a 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 36a. The first tilting portion 38a that extends, the intermediate portion 40a that extends slightly downward from the extending end of the first tilting portion 38a, and the horizontal portion that is substantially horizontal to the other side in the circumferential direction (the left side in FIGS. 1 and 2). And a lower end portion 44a that extends slightly downward from the extended end portion of the second tilt portion 42a and is connected to the tamper evidence skirt 6. The lower end portion 44a of the non-breaking connection piece 34a is thin, in other words, the thickness is reduced compared to other portions, that is, the upper end portion 36a, the first tilting portion 38a, the intermediate portion 40a, and the second tilting portion 42a. I'm hurt. The non-breaking connection piece 34b has a line symmetrical shape with the non-breaking connection piece 34a, and is connected to the lower end edge of the skirt wall 10 and the other end in the circumferential direction (in FIGS. 1 and 2). The first tilting portion 38b extending substantially horizontally on the left side, the intermediate portion 40b extending slightly downward from the extending end of the first tilting portion 38b, and the intermediate portion 40b are followed by one side in the circumferential direction (in FIGS. 1 and 2). A second inclined portion 42b that extends substantially horizontally on the right side) and a lower end portion 44b that extends slightly downward from the extended end portion of the second inclined portion 42b and is connected to the tamper evidence skirt portion 6. Yes. The lower end portion 44b of the non-breaking connecting piece 34b is thin, in other words, the thickness is reduced compared to other portions, that is, the upper end portion 36b, the first tilting portion 38b, the intermediate portion 40b, and the second tilting portion 42b. I'm hurt. The thicknesses of the upper end portions 36a and 36b, the first inclined portions 38a and 38b, the intermediate portions 40a and 40b, and the second inclined portions 42a and 42b in the non-breaking connection pieces 34a and 34b are about 0.40 to 1.20 mm. The thickness of the lower end portions 44a and 44b of the non-breaking connection pieces 34a and 34b may be about 0.20 to 0.40 mm. If desired, the first tilting part 36a and the second tilting part 42a in the non-breaking connection piece 34a and the first tilting part 36b and the second tilting part 42b in the non-breaking connection piece 34b are not horizontal but downward. It can also be made to extend somewhat inclined.

  Continuing the description with reference to FIG. 2, the mouth-and-neck portion 46 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 48 (the male thread 48 will be described in detail later) and a locking jaw part 50 positioned below the male thread 48 are formed on the outer peripheral surface of the mouth and neck portion 46.

  When the container lid 2 is attached to the mouth / neck part 46 and the mouth / neck part 46 is sealed, the container lid 2 is fitted on the mouth / neck part 46 and closed (clockwise as viewed from above in FIG. 2). The female thread 20 of the container lid 2 is screwed into the male thread 48 of the mouth-and-neck portion 46 by rotating. As the female thread 20 is engaged with the male thread 48, the container lid 2 gradually descends with respect to the mouth and neck portion 46. When the container lid 2 is lowered with respect to the mouth and neck portion 46 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 46, whereby the mouth-and-neck portion 46 is sealed. The locking means 24 disposed on the inner peripheral surface of the tamper evidence skirt 6 of the container lid 2 elastically climbs over the locking jaw 50 of the mouth-and-neck 46 and is placed on the lower surface of the locking jaw 50. It can be locked.

  When opening the mouth and neck portion 46, 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 48 of the mouth and neck portion 46 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 and raised in the opening direction, but the tamper evidence skirt 6 is locked by the locking means 24 of the mouth neck portion 46 by the locking means 24. As a result, the rise is prevented, and due to this, a considerable stress is generated in the breakable bridge portion 22 and the breakable bridge portion 22 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. 4 in conjunction with FIG. 2, when the body 4 is gradually separated from the tamper evidence skirt 6 upward, the first tilting piece 38a and the non-breaking piece of the non-breaking connecting piece 34a. The second tilting portion 42b of the connection piece 34b is pivoted clockwise in FIGS. 2 and 4 around the upper end and the lower end of the connection piece 34b, that is, tilted clockwise, while the second tilting piece 42a of the non-breaking connection piece 34a. The first tilting portion 38b of the non-breaking connecting piece 34b is pivoted counterclockwise in FIGS. 2 and 4 around the lower end and the upper end of the non-breaking connecting piece 34b, that is, tilted counterclockwise. The inclination angle α of the first tilt portions 38a and 38b and the second tilt portions 42a and 42b with respect to the vertical line in 34a and 34b is gradually reduced. As clearly understood by referring to FIG. 5 together with FIGS. 2 and 4, when the female thread 20 of the container lid 2 is completely disengaged from the male thread 48 of the mouth and neck 46, the container The main body 4 of the lid 2 is detached from the mouth / neck portion 46. However, since the body 4 continues to be connected to the tamper-evidence skirt 6 that continues to be attached to the mouth / neck 46 via the non-breaking connection pieces 34a and 34b, the body 4 is separated from the mouth / neck 46 of the container. There is nothing.

  In the illustrated container lid 2, the non-breaking connecting pieces 34a and 34b have two tilting portions whose tilt directions are opposite to each other, that is, the first tilting portion 38a and the second tilting portion 42a, and the first tilting portion 38b. And the second tilting portion 42b, the main body 4 is considerably longer than the tamper evidence skirt 6 in spite of the relatively small circumferential dimension in which the non-breaking connecting pieces 34a and 34b exist. It is allowed to be spaced apart upward. Therefore, even if it is necessary to raise the main body 4 over a considerable length in order to remove the main body 4 from the mouth-and-neck portion 46, the main body 4 can be moved to the mouth-and-neck portion without causing any particular problem. 64 can be disengaged.

  After the main body 4 of the container lid 2 is detached from the mouth-and-neck portion 46, the main body 4 is moved away from the mouth-and-neck portion 46 with the thin lower end portions 44a and 44b of the non-breaking connection pieces 34a and 34b as hinge fulcrums. Turn to the state shown in FIG. In this way, the outer surface of the lower end portion (tip end portion) of the protruding piece 30 formed on the main body 4 abuts on the upper surface of the locking jaw portion 50 of the mouth neck portion, and the step portion formed on the outer surface of the protruding piece 30. 32 is locked to the upper surface of the locking jaw 50, and the lower end of the skirt wall 10 of the main body 4 abuts against the outer peripheral surface of the tamper evidence skirt 6 so that the main body 4 is positioned as 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 halfway, the main body 4 held at the position shown in FIG. 5 is turned counterclockwise in FIG. 2 is rotated in the closing direction so that the female thread 20 of the container lid 2 is screwed onto the male thread 48 of the mouth-and-neck section 46, and thus the container lid 2 is positioned again in the state shown in FIG. 46 can be temporarily sealed

  Thus, in the container lid 2 constructed according to the present invention, the main body 4 held at the position shown in FIG. 5 is turned counterclockwise in FIG. In addition, the main body 4 can be fitted onto the mouth and neck part 46 smoothly and smoothly without being hindered by interference between the male thread 48 of the mouth and neck part 46 and the female thread 20 of the body 4. Further, with respect to the circumferential center of the protruding piece 30, that is, the turning start point 52, the circumferential position of the female thread 20, more specifically, the circumferential position of the screwing start end (that is, the lower end) 54 of the female thread 20 will be described in detail below. It is important that it is set exactly as you want. With reference to FIGS. 6 and 7, in the illustrated embodiment, the female thread 20 extends over an angular range of about 560 degrees from its threaded start end 54 to its terminal end (ie, upper end) 56. It has been. The female thread 20 is cut out at an angular position with an appropriate interval in the circumferential direction, and a plurality of ventilation cutouts 58 are formed. It is important that the screwing start end 54 of the female thread 20 is positioned in an angle region of ± 90 degrees, preferably ± 45 degrees with respect to the turning start point 52. Further, in an angular region of ± 30 degrees, preferably ± 40 degrees with respect to the turning tip angular position 60 which is the diametrically opposite side relative to the turning start point 52 (that is, a position 180 degrees apart in the circumferential direction) The lowermost part of the female thread 20 (that is, the lowermost part of the female thread 20 when the female thread 20 is positioned at an interval in the axial direction in the specific angle region) is continuous. It is preferable that it is notched or the height of the thread is reduced. In the illustrated embodiment, the thread height of the female thread 22 is halved in an angle region of ± 40 degrees with respect to the turning tip angular position 60 (an angle region indicated by a symbol x in FIGS. 6 and 7). ing.

  The male thread 48 formed on the outer peripheral surface of the container neck 46 is approximately 860 from the screwing start end (ie, the upper end) 62 as clearly understood by referring to FIG. 8 together with FIG. It extends over a range of degrees. The male thread 48 is also cut out at an angular position with an appropriate interval in the circumferential direction, and a plurality of ventilation cutouts 64 are formed.

  When the main body 4 of the container lid 2 is swung counterclockwise in the state shown in FIG. 5 and fitted into the mouth-and-neck portion 46 of the container, the female thread 20 usually interferes with the male thread 48. Therefore, the turning of the main body 4 tends to be hindered, and this tendency is caused when the screwing start end 60 of the male thread 48 is located at an angular position corresponding to the turning tip angular position 60 (illustrated in FIG. 5). In the state, the screw start end 62 of the male screw 48 is positioned in the vicinity of the turning start point 52. However, in the state shown in FIGS. 9 and 10, the screw start end 62 of the male screw 48 is the turning tip angle. Corresponds to position 60). However, in the container lid 2 configured according to the present invention, as described above, the screwing start end 54 of the female thread 20 is positioned in an angular region of ± 90 degrees, preferably ± 45 degrees with respect to the turning start point 52. The swivel tip angle position 60 is spaced apart from the screw start end 54 of the female screw 20 by at least 90 degrees in the circumferential direction. Therefore, the screw start end 52 of the female screw 20 is at the turn tip angle position 60. A portion displaced upward from is located. Therefore, as clearly understood by referring to FIGS. 9 and 10, the interference of the female thread 20 with respect to the male thread 48 is avoided as much as possible, and the main body 4 is illustrated in FIG. 10 sufficiently smoothly. It can be swung to the position and fitted to the mouth and neck portion 46.

  11 and 12 show a typical example of a container lid in which the circumferential position of the screwing start end (ie, the lower end) 154 of the female thread 120 is not set as described above (and thus has not been improved according to the present invention). Is illustrated. In the container lid 102 illustrated in FIGS. 11 and 12, the screwing start end 154 of the female thread 120 is positioned in the vicinity of the turning tip angular position 160. In the case of such a container lid 102, as will be understood by referring to FIGS. 13 and 14, and in particular, FIG. 14, when the body 104 is pivoted to the position illustrated in FIG. Therefore, in order to fit the main body 104 to the mouth and neck 146, the interference between the female thread 120 and the male thread 148 can be overcome by elastic deformation of the main body 104. It is necessary and it is extremely difficult to fit the main body 104 to the mouth and neck 146.

2: Container lid 4: Main body 6: Tamper evidence hem 8: Top wall 10: Skirt wall 20: Female thread 22: Breakable bridge 24: Locking means 30: Protruding piece 34a: Non-breaking connecting piece 34b : Non-breaking connection piece 46: Mouth neck portion 48: Male thread 50: Locking jaw portion 52: Turning start point (circumferential center of protruding piece)
54: Screwing start point of female thread 60: Turning tip angular position

Claims (4)

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 end of the female thread formed on the inner peripheral surface of the skirt wall is positioned in an angle region within ± 90 degrees with respect to the circumferential center of the protruding piece. A synthetic resin container lid.   The screwing start end of the female thread formed on the inner peripheral surface of the skirt wall is positioned in an angular region within ± 45 degrees with respect to the circumferential center of the protruding piece. The synthetic resin container lid as described.   In the angular region of ± 30 degrees with respect to the turning tip angular position that is 180 degrees apart in the circumferential direction with respect to the circumferential center of the projecting piece, the portion located at the lowest position in the axial direction of the female thread is continuous. The synthetic resin container lid according to claim 1 or 2, wherein the height of the thread is cut continuously or continuously reduced.   In an angular region of ± 40 degrees with respect to the turning tip angular position, the portion located in the lowest axial direction of the female thread is continuously cut out or the thread height is reduced. The synthetic resin container lid according to claim 3.

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