JP2016190647A - Synthetic resin container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin container lid (2) which can be detached from a neck (48) of the container without using an opening tool while the neck (48) of the container can be sufficiently surely sealed, can be sufficiently smoothly subjected to a printing step when printed on the upper face of a top face wall (4), as needed, and is made less bulky and can reduce a conveyance cost.SOLUTION: A container lid (2) has a top face wall (4) and a skirt wall (6), and an engagement projection (12) is formed on the inner peripheral surface of the skirt wall. A plurality of thin wall reverse pieces (18) are arranged at intervals in the circumferential direction which extend from the outer peripheral surface of the skirt wall (6) or one end connected to a boundary portion between the outer peripheral surface of the skirt wall (6) and the upper face of the top face wall (4). A binding wall (20) is connected to the other end of the thin wall reverse pieces (18). The binding wall (20) surrounds the skirt wall and the upper end edge of the binding wall (20) is positioned so as to be flush with the upper face of the top face wall (4) or below than the upper face of the top face wall (4).SELECTED DRAWING: Figure 6

Description

  The present invention relates to a synthetic resin container lid, generally referred to as a plugging type, that is attached to the mouth and neck by being fitted to the mouth and neck of the container and forced downward.

  The following Patent Document 1 is made of a plug-type synthetic resin that can be removed from the mouth and neck of the container without using an opening device, even though the mouth and neck of the container can be sufficiently sealed. As a container lid, in addition to a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, a cylindrical constraining wall connected to the outer peripheral surface of the skirt wall via a breakable connecting portion, and a skirt wall A synthetic resin container lid is disclosed that includes an operation portion that extends downward from a connected upper end over a skirt wall. In a state before the container lid is attached to the mouth and neck of the container, the constraining wall extends upward beyond the upper surface of the top wall. When attaching the container lid to the mouth / neck of the container, the skirt wall is fitted on the mouth / neck and forced downward, and the engaging ridge on the inner peripheral surface of the skirt wall is placed on the outer peripheral surface of the mouth / neck. The engaging ridge is engaged, and the restraining wall is forced downward with respect to the skirt wall, whereby the connecting portion is broken and the restraining wall is lowered to a state surrounding the skirt wall. When opening the mouth and neck by removing the container lid from the mouth and neck of the container, put the finger on the operation part to force it outward and upward in the radial direction, and thus partially displace the restraint wall upward At the same time, the skirt wall is partially displaced upward to disengage the entire container lid from the mouth and neck.

JP 2012-201399 A

  Thus, the above-described conventional container lid is still not fully satisfactory, and before the container lid is attached to the mouth and neck of the container, the restraint wall extends upward beyond the top surface of the top wall. (1) When printing on the upper surface of the top wall, the restraint wall becomes an obstacle, and the conventional printing equipment cannot perform a smooth printing process, and (2) the container There is a problem to be solved that the entire lid becomes bulky and the conveyance cost becomes relatively expensive.

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that the mouth and neck of the container can be sealed without using an opening device even though the mouth and neck of the container can be sufficiently sealed. In addition to being able to detach from the neck, when printing on the top surface of the top wall, if necessary, the printing process can be performed sufficiently smoothly with conventional printing equipment, and the bulkiness is further reduced. It is to provide a new and improved synthetic resin container lid in which the conveyance cost is reduced.

  As a result of intensive studies, the present inventors applied secondary processing to lower the restraint wall partially with respect to the skirt wall as necessary, and attached the container lid to the mouth and neck of the container. The above-mentioned main technical problem is achieved by surrounding the skirt wall and positioning the upper end edge flush with or below the top surface of the top wall. I found out that I can.

That is, according to the present invention, the synthetic resin container lid that achieves the above main technical problem includes a top wall and a skirt wall that hangs down from the periphery of the top wall, and the inner peripheral surface of the skirt wall In a synthetic resin container lid in which a stop ridge is formed,
A plurality of thin inverted pieces extending from one end connected to the outer peripheral surface of the skirt wall or the boundary between the outer peripheral surface of the skirt wall and the upper surface of the top wall are arranged at intervals in the circumferential direction. ,
The other end of the thin-walled inversion piece is connected to a constraining wall defined by a weakened part that is divided or breakable at a specific portion in the circumferential direction,
Locked protrusions that protrude radially outward from the outer peripheral surface of the restraint wall are formed on both sides in the circumferential direction of the specific portion of the restraint wall,
An operation portion is connected to the skirt wall via a connecting piece extending in a radial direction from the outer peripheral surface of the skirt wall at a position aligned with the specific portion of the restraint wall in the circumferential direction.
The operation portion is formed with locking protrusions protruding radially inward on both sides in the circumferential direction of the connection piece,
The constraining wall surrounds the skirt wall and the upper end edge of the constraining wall is located flush with or below the top surface of the top wall;
A synthetic resin container lid is provided.

  Preferably, the locked protrusion formed on the restraint wall is positioned above the locking protrusion formed on the operation portion. Conveniently, the thin inverted piece is shaped so as to extend axially upward from the end, and then the constraining wall is lowered axially to partially invert the thin inverted piece. The thin inversion piece is formed with a local thin line extending in the width direction, and when the thin inversion piece is partially inverted, the thin inversion piece is preferably folded along the local thin line. is there. In a preferred embodiment, a circumferentially extending groove or ridge is formed on the inner peripheral surface of the constraining wall, and a circumferentially extending ridge or groove is formed on the outer peripheral surface of the skirt wall. When the constraining wall is lowered in the axial direction and the thin inverted piece is partially inverted, the groove or ridge formed in the constraining wall is formed in the skirt wall. Engage with the groove. The ridge or groove of the skirt wall and the groove or ridge of the restraining wall are advantageously formed in a region where the thin-walled inversion piece does not exist in the circumferential direction. Preferably, the operation unit includes a ring on which a finger can be hung. The skirt wall is advantageously formed with a plurality of slits extending upward from the lower end of the skirt wall at intervals in the circumferential direction. The inner diameter of the portion of the constraining wall that aligns with the thin inverted piece in the circumferential direction is larger than the inner diameter of the other portion excluding the specific portion, and the inner diameter of the other portion corresponds to the outer diameter of the skirt wall. It is preferable. A plurality of concave portions extending upward from the lower end of the skirt wall are disposed on the outer peripheral surface of the skirt wall at intervals in the circumferential direction, and the one end of the thin-walled inversion piece is connected to the concave portion. It is preferable. Preferably, the locking ridge of the skirt wall is formed by fitting the skirt wall on the mouth and neck of a container having a cylindrical mouth and neck having a locking ridge formed on the outer peripheral surface. Is engaged with the locked protrusion of the mouth-and-neck portion, and the locking projection formed on the restraining wall is lowered and the locking projection formed on the operating wall is It is attached to the mouth-and-neck portion by engaging with the protrusion. The specific part of the restraint wall is defined by a breakable weakening portion, and the locked protrusion formed on the restraint wall by lowering the restraint wall is formed on the operation portion. It is preferable that the connection piece acts on the weakened portion and the weakened portion is broken when locked by the locking projection.

  In the synthetic resin container lid of the present invention, the restraint wall surrounds the skirt wall, and the upper end edge of the restraint wall is positioned flush with or below the top surface of the top wall. Therefore, when printing is performed on the upper surface of the top wall as required, the printing process can be performed sufficiently smoothly without being obstructed by the restraint wall, and the bulk is reduced and the conveyance cost is reduced. .

The perspective view which shows the primary shaping | molding state (state before adding secondary shaping | molding) of suitable embodiment of the synthetic resin container lid comprised according to this invention. The bottom view of the container lid shown in FIG. Sectional drawing in line III-III of FIG. Sectional drawing which shows the initial state of the secondary process given to the container lid shown in FIG. Sectional drawing which shows the final state of the secondary process given to the container lid shown in FIG. Sectional drawing which shows the container lid completed by giving a secondary process to the container lid shown in FIG. FIG. 7 is a partial cross-sectional view illustrating a modification of the container lid illustrated in FIG. 6. FIG. 7 is a partial cross-sectional view illustrating still another modification of the container lid illustrated in FIG. 6. Sectional drawing which shows the initial state of the mounting process which mounts the container lid shown in FIG. 6 in the mouth neck part of a container. FIG. 7 is a cross-sectional view showing an intermediate state in the previous stage of the mounting step of mounting the container lid shown in FIG. 6 on the mouth and neck of the container. Sectional drawing which shows the latter middle state of the mounting process which mounts | wears with the container neck shown in FIG. 6 in the mouth neck part of a container. Sectional drawing which shows the final state of the mounting process which mounts the container lid shown in FIG. 6 in the mouth neck part of a container. Sectional drawing which shows the state which mounted | wore the mouth neck part of the container with the container lid shown in FIG. FIG. 7 is a perspective view showing an intermediate state when the container lid shown in FIG. 6 is detached from the mouth and neck of the container. Sectional drawing which shows the intermediate | middle state at the time of removing the container lid shown in FIG. 6 from the mouth neck part of a container. FIG. 7 is a perspective view illustrating a final state when the container lid illustrated in FIG. 6 is detached from the mouth and neck of the container. Sectional drawing which shows the final state at the time of removing the container lid shown in FIG. 6 from the mouth neck part of a container.

  Hereinafter, with reference to an accompanying drawing, a suitable embodiment of a synthetic resin container lid constituted according to the present invention is described in detail.

  1 to 3 show a state in which a synthetic resin container lid constructed according to the present invention is primarily molded by injection molding or compression molding using a molding die, in other words, secondary molding described later. The previous state is illustrated. The illustrated container lid, generally designated by numeral 2, which can be integrally injected or compression molded from a suitable synthetic resin such as polyethylene or polypropylene, has a top wall 4 and a skirt wall 6 depending from the periphery of the top wall 4. It comprises. The top wall 4 has a circular shape in a plan view, and has a flat central portion and a peripheral edge portion inclined downward in the radial direction. As clearly shown in FIG. 3, two annular seal pieces extending downward, that is, an inner seal piece 8 and an outer seal piece 10, are disposed on the inner peripheral edge of the top wall 4.

  The skirt wall 6 has a substantially cylindrical shape as a whole. An annular locking ridge 12 is formed at the lower end of the inner peripheral surface of the skirt wall 6. As clearly understood by referring to FIG. 1 and FIG. 3, a plurality of slits 14 extending upward from the lower end of the skirt wall 6 are formed at the lower end portion of the skirt wall 6. Has been. On the outer peripheral surface of the skirt wall 6, a plurality of recesses 16 extending from the lower end to the upper end of the skirt wall 6 are disposed at intervals in the circumferential direction, and five in the illustrated case. And the lower end of the thin inversion piece 18 is connected to the upper part of each of the recesses 16. Conveniently, the circumferential width of the thin reversal piece 18 is somewhat smaller than the circumferential width of the recess 16. Each of the thin inverted pieces 18 extends upward beyond the top wall 4. If desired, the lower end of the thin reversal piece 18 can be connected to the boundary region between the skirt wall 6 and the top wall 4 in place of the outer peripheral surface of the skirt wall 6.

  A restraint wall 20 is connected to the upper end of the thin-walled reversal piece 18. The constraining wall 20 has a substantially annular shape, and the specific portion 22 in the circumferential direction thereof is defined by a breakable weakening portion 24 formed of a bridging piece having a small cross-sectional area. If desired, the bridging piece constituting the weakened portion 24 may be formed with a very weak portion having a reduced cross-sectional area, for example, in the central portion in the circumferential direction. Further, the restraint wall 20 can be divided at the specific portion 22 without providing the weakening portion 24. However, when the restraint wall 20 is lowered with respect to the skirt wall 6 as described later, the restraint wall 20 is twisted. Alternatively, it is preferable to arrange the weakened portion 24 at the specific portion 22 so that excessive expansion is sufficiently avoided. In the illustrated embodiment, the weakening portion 24 is disposed at the upper end portion of the constraining wall 20 in the axial direction, but may be disposed in the middle portion of the constraining wall 20 in the axial direction. Locked protrusions 26 that protrude outward in the radial direction are formed on both sides of the specific portion 22 in the circumferential direction. Each circumferential inner side surface (that is, the side surface adjacent to the specific portion 22) of the locked projection 26 extends in the radial direction, but each circumferential outer surface (that is, spaced apart from the specific portion 22) of the locked projection 26. The side surface is an inclined surface extending outward in the circumferential direction outward in the radial direction. As clearly understood by referring to FIG. 2 in conjunction with FIG. 1, the restraint wall 20 is locally displaced somewhat radially outward at a plurality of portions where the thin-walled inversion pieces 18 exist, Therefore, the inner diameter of the constraining wall 20 locally corresponds to the other portion excluding the specific portion 22 (the inner diameter of such a portion corresponds to the outer diameter of the portion of the skirt wall 6 where the recess 16 is not formed, in other words, The sash is increased somewhat more than the outer diameter.

  An operating portion 30 is connected to the outer peripheral surface of the skirt wall 6 via a connecting piece 28 protruding outward in the radial direction. The circumferential position of the connecting piece 28 is aligned with the circumferential position of the specific portion 22 of the restraint wall 20. The operation unit 30 includes a base 32 and a ring 34, and the inner surface of the base 32 is connected to the protruding end of the connection piece 28. The base portion 32 extends on both sides in the circumferential direction, and locking projections 36 that protrude inward in the radial direction are formed on the inner surfaces of both side ends of the base portion 32 located on both sides of the connection piece 28. Each of the locking projections 36 has an outer circumferential surface (that is, a side surface spaced from the connection piece 28) extending in the radial direction, while each of the locking projections 36 has an inner circumferential surface (that is, a side surface adjacent to the connection piece 28). ) Is an inclined surface inclined inward in the circumferential direction toward the inner side in the radial direction. The ring 34 depending from the base 32 has a substantially annular shape.

  In the container lid 2 configured according to the present invention, the following secondary molding is performed on the primary molded container lid 2 shown in FIGS. 1 to 3. As shown in FIG. 4, for example, the top surface wall 4 of the container lid 2 is supported by a support means 38 which may be a columnar support anvil having an upper surface which is brought into contact with the central portion of the inner surface of the top surface wall 4. The pressing block 40 fixed to the lower end of the restraint wall 20 is brought into contact with the upper end edge of the restraining wall 20. Next, as shown in FIG. 5, the pressing block 40 is lowered to forcibly lower the restraint wall 20 to the position shown in FIG. At this time, as clearly understood by comparing and referring to FIG. 4 and FIG. 5, each of the thin inverted pieces 18 is folded at a substantially middle portion in the vertical direction and deformed into a U shape. When the restraint wall 20 is lowered to the position shown in FIG. 5, the restraint wall 20 surrounds the upper part of the skirt wall 6, and the upper end edge of the restraint wall 20 is substantially flush with the upper surface of the top wall 4. However, the restraint wall 20 is positioned above the operation portion 30 attached to the skirt wall 6, and therefore the latched protrusion 26 formed on the restraint wall 20 is the latch protrusion formed on the operation portion 30. It is located above 36 and is not locked to the locking projection 36. It is important that the restraining wall 20 and the thin-walled inversion piece 18 do not surround the lower part of the skirt wall 6 on which the locking protrusion 12 is formed on the inner peripheral surface. FIG. 6 illustrates the container lid 2 after the secondary processing. If desired, an annular member having an opening corresponding to the top wall 4 is used as the pressing block 40, and the restraint wall 20 is lowered to a position where the upper end edge is slightly below the top surface of the top wall 4. You can also.

  FIG. 7 shows a modification of the container lid 2 constructed according to the present invention. In this modified example, a locally thin line 42 is defined by forming a groove extending in the lateral direction over the entire width in the vertical direction intermediate portion of each outer side surface of the thin-walled reversal piece 18, and When lowered, each thin reversal piece 18 is bent by a local thin line 42. As can be understood by comparing and comparing FIG. 6 and FIG. 7, when the local thin line 42 does not exist, as shown by the two-dot chain line in FIG. 5 and FIG. There is a tendency that the constraining wall 20 is displaced from the required position due to the elastic restoring force generated in each of the thin-walled inversion pieces 18 by being folded, but each of the thin-walled inversion pieces 18 is locally localized. When the thin line 42 exists, the elastic restoring force generated in each of the thin inversion pieces 18 can be made sufficiently small, and the displacement of the restraint wall 20 can be avoided as much as possible.

  FIG. 8 illustrates yet another variation of the container lid 2 constructed in accordance with the present invention. In the modification shown in FIG. 8, it extends continuously in the circumferential direction at the upper end of the outer peripheral surface of the skirt wall 6 (part somewhat above the part to which one end of the thin reversal piece 18 is connected) (or A plurality of projecting ridges 44 extending in the circumferential direction on a portion of the inner peripheral surface of the restraining wall 20 that is not displaced outward in the radial direction, that is, an angular region where the thin-walled inversion piece 18 does not exist. Is formed. On the other hand, grooves 46 extending in the circumferential direction are formed in a plurality of portions that are not displaced outward in the radial direction on the inner peripheral surface of the constraining wall 20, that is, in an angle region where the thin inversion piece 18 does not exist. As shown in FIG. 8, when the secondary processing is performed and the restraint wall 20 is lowered to the required position with respect to the skirt wall 6, the groove 46 of the restraint wall 20 and the protrusion 44 of the skirt wall 6 are engaged. Thus, the restraint wall 20 is moored at the lowered position. If desired, grooves can be formed in the skirt wall 6 and ridges can be formed in the constraining wall 20.

  Next, a mounting method in which the container lid 2 subjected to the secondary processing illustrated in FIG. 6 is mounted on the mouth and neck of the container and the mouth and neck are sealed will be described. Referring to FIG. 9, the container lid 2 is made of a suitable synthetic resin such as polyethylene terephthalate, a metal thin plate such as an aluminum-based alloy thin plate, or a neck portion 48 of the container (FIG. (Only the neck is shown). An annular locked protrusion 50 is formed on the upper part of the outer peripheral surface of the mouth-and-neck portion 48 that is generally cylindrical. In the illustrated neck-and-neck portion 48, an annular groove 51 is formed in the intermediate portion in the axial direction of the locking protrusion 50 in order to reduce both required materials. An annular support ring 52 positioned below the locking protrusion 50 is further formed on the outer peripheral surface of the mouth and neck portion 48. As is well known, the support ring 52 is used for appropriately transporting the container.

  When the container lid 2 is attached to the mouth / neck portion 48 of the container, as shown in FIG. 9, the upper end portion of the mouth / neck portion 48 of the container supported on an appropriate support base (not shown) is used. The container lid 2 is fitted, and the mounting device indicated as a whole by the number 54 is positioned on the container lid 2 as required. The mounting device 54 includes a central pressing member 56 and an outer pressing member 58 surrounding the central pressing member 56. The central pressing member 56 and the outer pressing member 58 are connected to an appropriate lifting mechanism (not shown) and can be moved up and down separately. In the illustrated embodiment, the central pressing member 56 is composed of a circular bottom wall 60 and a cylindrical upright wall 62 extending upward from the periphery of the bottom wall 60. The bottom wall 60 defines a circular lower surface 64 that extends substantially horizontally. The outer pressing member 58 includes a substantially cylindrical side wall 66 and a substantially cylindrical correction wall 68 extending further downward from the lower end of the side wall 66. The inner diameter of the main portion of the side wall 66 is substantially the same as the outer diameter of the upright wall 62 of the central pressing member 56, and the central pressing member 56 is positioned in the side wall 66 of the outer pressing member 58. The inner diameter of the lower end portion of the side wall 66 is made somewhat larger than the inner diameter of the main portion, and an annular lower surface 70 that extends substantially horizontally is defined at the lower end of the side wall 66. At the upper end of the side wall 66, an upper wall 72 having a through opening formed at the center is formed. The inner peripheral surface of the correction wall 68 extends downward from the outer peripheral edge of the lower surface 70, and the upper half of the correction wall 68 has a cylindrical shape extending substantially vertically, but the lower half of the correction wall 68 is inclined outward in the radial direction toward the lower side. The shape of the truncated cone extends.

  In the initial stage of the mounting process, as shown in FIG. 9, the lower surface 64 of the central pressing member 56 is brought into contact with only the upper surface of the top wall 4 of the container lid 2, and the lower surface 70 of the outer pressing member 58 is in contact with the container lid. It is positioned above the second restraining wall 20 (that is, the lower surface 70 of the outer pressing member 58 is not in contact with the upper end edge of the restraining wall 20). Next, the central pressing member 56 and the outer pressing member 58 are simultaneously lowered to the position shown in FIG. Thus, as clearly understood by comparing FIG. 9 and FIG. 10, the container lid 2 is forced downward with respect to the container neck 48 and the upper end of the mouth neck 48 is the container lid. 2 is located between the inner seal piece 8 and the outer seal piece 10 formed on the inner or lower surface of the top wall 4 to seal the mouth-and-neck portion 48 and also to the inside of the skirt wall 6 of the container lid 2. The locking ridge 12 formed on the peripheral surface elastically climbs over and engages with the locked ridge 50 formed on the outer peripheral surface of the mouth-and-neck portion 48.

  Thereafter, the outer pressing member 58 is lowered until it is shown in FIG. At this time, when the outer pressing member 58 is lowered to the position shown in FIG. 11, the lower surface 70 of the outer pressing member 58 is brought into contact with the upper end edge of the restraining wall 20 of the container lid 2. Further, the specific angle portion of the inner peripheral surface of the correction wall 68 attached to the outer pressing member 58 is located close to or in contact with the outer surface of the operation unit 30 on the skirt wall 6 of the container lid 2. As described above, the locking ridge 12 formed on the inner peripheral surface of the skirt wall 6 of the container lid 2 elastically climbs over the locked ridge 50 formed on the outer peripheral surface of the mouth neck portion 48. At this time, the skirt wall 6 is subjected to a force for squeezing the lower part thereof in the radial direction, causing the operating portion 30 to move outward in the radial direction. Tends to be inclined toward the direction (this makes it difficult to lock the locked protrusions 26 and the locking protrusions 36, which need to be engaged with each other as described later). End up). However, when the state shown in FIG. 10 is reached to the state shown in FIG. 11, the specific angle portion of the inner peripheral surface of the correction wall 68 attached to the outer pressing member 58 is the skirt wall 6 of the container lid 2 as described above. In this state, the operation unit 30 is brought into contact with or close to the outside and is positioned outside the operation unit 30, thereby correcting the inclination of the operation unit 30. When the outer pressing member 58 is lowered to the position shown in FIG. 12, the restraining wall 20 is moved to the position shown in FIG. 12, that is, below the skirt wall 6 by the pressing force applied to the restraining wall 20 from the lower surface 70 of the outer pressing member 58. The lower half of the skirt wall 6 is reliably prevented from being displaced radially outward by surrounding the half, and is lowered to a position where the attachment of the container lid 2 to the mouth-neck 48 is solid. . At this time, the connecting piece 28 formed on the skirt wall 6 acts on the weakened portion 24 of the restraining wall 20, whereby the weakened portion 24 is broken and is also locked on the restraint wall 20. The protrusion 26 and the locking protrusion 36 formed on the operating portion 30 are locked to each other (see FIGS. 1 and 2). Each of the thin inverted pieces 18 is deformed from a state folded in a U shape to a state extending downward. On the other hand, when the outer pressing member 58 is lowered to the position shown in FIG. 12, the upper wall 72 of the outer pressing member 58 comes into contact with the upper end of the upright wall 62 of the central pressing member 56. (Therefore, the upper wall 72 of the outer member 58 and the upright wall 62 of the central pressing member 56 cooperate to limit the lowering of the outer pressing member 58 relative to the central pressing member 56 to a predetermined position). Means). As described above, when the container lid 2 is attached to the mouth / neck portion 48 as required, the container with the container lid 2 attached thereto is taken out from the attachment device. FIG. 13 shows a state where the container lid 2 is attached to the mouth / neck portion 48 of the container as required.

  When the container lid 2 is detached from the mouth / neck portion 48 of the container and the mouth / neck portion 48 is opened, the finger is put on the ring 34 of the operation portion 30 to be displaced radially outward and upward. When the operation unit 30 is displaced to the position shown in FIGS. 14 and 15, the locking projection 36 disposed on the base portion 32 of the operation unit 30 and the locked projection 26 disposed on the constraint wall 20. And the expansion of the constraining wall 20 is allowed. Accordingly, the skirt wall 6, in particular, the lower end of the skirt wall 6 is allowed to displace outward in the radial direction, and the locking ridge 12 formed on the lower end of the inner peripheral surface of the skirt wall 6 and the mouth and neck 48 are locked. Interlocking with the protrusion 50 is partially released, and the skirt wall 6 is partially displaced upward. When the pressure in the container is larger than the atmospheric pressure, when the partial rise of the skirt wall 6 is started, the sealing of the mouth and neck part 48 is locally released, the pressure in the container is released, and the container lid is released. 2 is prevented from accidentally flying from the mouth and neck 48. Then, when the ring 34 is displaced upward and radially opposite, the entire container lid 2 is disengaged from the mouth-and-neck portion 48 as clearly understood by referring to FIGS. Part 48 is opened.

  The preferred embodiments of the container lid configured according to the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such embodiments and departs from the scope of the present invention. Various modifications or corrections are possible. For example, in the illustrated embodiment, when the restraint wall 20 is lowered with respect to the skirt wall 6 when the container lid 2 is attached to the mouth / neck portion 48 of the container, the weakened portion 24 of the restraint wall 20 is broken. If desired, when the container lid 2 is attached to the mouth-and-neck part 48, the connecting piece 28 or the operation part 30 does not act on the weakened part 24, and the container lid 2 is removed from the mouth-and-neck part 48. The connection piece 28 or the operation part 30 may act on the weakening part 24 to be broken when the operation part 30 is displaced. In the illustrated embodiment, in primary molding using a molding die, the container lid 2 is molded in a state where the constraint wall 20 extends above the upper surface of the top wall 4, and in the secondary molding, the constraint wall is formed. 20 is lowered so that the upper end edge of the constraining wall 20 is flush with the upper surface of the top wall 4 or below it, but if desired, the molding die becomes complicated and the so-called die-cutting process becomes complicated. However, it is also possible to form a container lid in which the upper end edge of the constraining wall is flush with or below the top wall only by molding using a mold.

2: Container lid 4: Top wall 6: Skirt wall 12: Locking ridge 14: Slit 16: Recess 18: Thin-walled reversal piece 20: Restriction wall 22: Specific part 24: Weakened part 26: Locked protrusion 28: Connection Piece 30: Operation part 34: Ring 36: Locking protrusion 42: Local thin wall line 44: Projection 46: Groove 48: Mouth and neck part 50: Locked protrusion

Claims (12)

In a synthetic resin container lid comprising a top wall and a skirt wall depending from the periphery of the top wall, and a locking protrusion formed on the inner peripheral surface of the skirt wall,
A plurality of thin inverted pieces extending from one end connected to the outer peripheral surface of the skirt wall or the boundary between the outer peripheral surface of the skirt wall and the upper surface of the top wall are arranged at intervals in the circumferential direction. ,
The other end of the thin-walled inversion piece is connected to a constraining wall defined by a weakened part that is divided or breakable at a specific portion in the circumferential direction,
Locked protrusions that protrude radially outward from the outer peripheral surface of the restraint wall are formed on both sides in the circumferential direction of the specific portion of the restraint wall,
An operation portion is connected to the skirt wall via a connecting piece extending in a radial direction from the outer peripheral surface of the skirt wall at a position aligned with the specific portion of the restraint wall in the circumferential direction.
The operation portion is formed with locking protrusions protruding radially inward on both sides in the circumferential direction of the connection piece,
The constraining wall surrounds the skirt wall and the upper end edge of the constraining wall is located flush with or below the top surface of the top wall;
A synthetic resin container lid.   The synthetic resin container lid according to claim 1, wherein the locked protrusion formed on the restraining wall is positioned above the locking protrusion formed on the operation portion.   3. The synthetic resin according to claim 2, wherein the thin-walled inversion piece is formed in a state of extending upward in the axial direction from the one end, and then the constraining wall is lowered in the axial direction to partially invert the thin-walled inversion piece. Container lid.   The thin-walled reversal piece is formed with a local thin line extending in the width direction, and when the thin-walled reversal piece is partially reversed, the thin-walled reversal piece is folded along the local thin-wall line. The synthetic resin container lid as described.   Grooves or ridges extending in the circumferential direction are formed on the inner peripheral surface of the constraining wall, and ridges or grooves extending in the circumferential direction are formed on the outer peripheral surface of the skirt wall. When the thin inverted piece is partially inverted by being lowered in the direction, the groove or the ridge formed in the restraining wall is engaged with the ridge or the groove formed in the skirt wall. The synthetic resin container lid according to claim 3 or 4.   The synthetic resin container lid according to claim 5, wherein the ridge or groove of the skirt wall and the groove or ridge of the restraining wall are formed in a region where the thin-walled inversion piece does not exist in the circumferential direction.   The synthetic resin container lid according to any one of claims 1 to 6, wherein the operation portion includes a ring on which a finger can be hung.   The synthetic resin container lid according to any one of claims 1 to 7, wherein a plurality of slits extending upward from a lower end of the skirt wall are formed in the skirt wall at intervals in the circumferential direction.   The inner diameter of the portion of the constraining wall that aligns with the thin inverted piece in the circumferential direction is larger than the inner diameter of the other portion excluding the specific portion, and the inner diameter of the other portion corresponds to the outer diameter of the skirt wall. The synthetic resin container lid according to any one of claims 1 to 8.   A plurality of recesses extending upward from the lower end of the skirt wall are disposed on the outer peripheral surface of the skirt wall at intervals in the circumferential direction, and the one end of the thin inverted piece is connected to the recess. The synthetic resin container lid according to any one of claims 1 to 9.   The skirt wall is fitted on the mouth and neck portion of a container having a cylindrical mouth and neck portion on which an engaged protrusion is formed on the outer peripheral surface, and the engaging protrusion on the skirt wall is connected to the mouth and neck. Engaging with the locked protrusion of the portion, and lowering the restraining wall to lock the locked protrusion formed on the restraining wall with the locking protrusion formed on the operating portion The synthetic resin container lid according to any one of claims 1 to 10, wherein the synthetic resin container lid is attached to the mouth / neck portion.   The specific part of the restraint wall is defined by a breakable weakening portion, and the locked protrusion formed on the restraint wall by lowering the restraint wall is formed on the operation portion. The synthetic resin container lid according to claim 11, wherein when the locking piece is locked, the connecting piece acts on the weakened portion and the weakened portion is broken.