JP6322446B2 - Plastic container lid - Google Patents

Description

  The present invention relates to a synthetic resin container lid of a form generally referred to as a plugging type, which 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 discloses a stopper-type synthetic resin container 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. A lid is disclosed. The container lid includes a circular top wall (top plate portion), a cylindrical skirt wall (skirt portion) depending from the periphery of the top wall, and a restraining ring (ring-shaped side wall) surrounding the skirt wall. The skirt wall is formed with a plurality of slits extending upward from the lower end at intervals in the circumferential direction, and a locking protrusion is formed at the lower part of the inner peripheral surface of the skirt wall. Constraining ring is integrally connected to the skirt wall via the connecting portion in the circumferential direction specific area, it is not connected to the outer peripheral edge of the skirt wall in the region other than the specific region but scan mosquitoes over preparative wall It is in close contact with the outer peripheral surface.

  The container lid as described above is fitted on the mouth and neck of the container and forced downward, and the engagement protrusion formed on the lower inner peripheral edge of the skirt wall is formed on the outer peripheral surface of the mouth and neck. By elastically climbing over the stop jaw and allowing it to be locked to the locking jaw, the mouth and neck are sealed by being attached to the mouth and neck. Since the expansion of the skirt wall radially outward is limited by the restraining ring, the container lid is securely attached to the mouth and neck to seal the mouth and neck, and the container lid is accidentally detached from the mouth and neck. There is no fear of being done. When opening the mouth and neck, the restraint ring is gripped and the restraint ring is swung upward using the specific region as a pivot base, and the restraint ring is separated upward from the skirt wall in a region other than the specific region, Thus, the restraint of the skirt wall is released. Next, when the restraint ring is further forced upward, the lower part of the restrained skirt wall is displaced radially outward, and the latching ridge of the skirt wall is unlocked from the latching jaw of the mouth and neck. Then, the entire container lid is detached from the mouth and neck.

Japanese Patent No. 3492007

  Thus, in the conventional container lid as described above, (1) when the container lid is attached to the mouth / neck portion of the container, the restraint ring surrounds the skirt wall over the entire circumferential direction. It is necessary to force the lid downward, and a considerably large forcing force, that is, a plugging force, is required. (2) As described in the above-mentioned Patent Document 1, in order to complete the container lid, After the constraining ring is integrally formed, it is necessary to cut the skirt wall and the constraining ring by cutting with a cutting blade outside the specific region, and there is a problem to be solved that the manufacturing process is complicated. .

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that it can be attached to the mouth / neck portion of the container sufficiently reliably even though it can be attached to the mouth / neck portion of the container with a relatively small stoppering force. To provide a new and improved captive synthetic resin container lid that can be mounted and also manufactured without additional operations such as cutting after injection or compression molding.

  As a result of intensive studies, the present inventors have circulated a thin-walled reversal piece extending upward from the lower 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 outer surface of the top surface wall, beyond the top surface wall. A plurality of cylindrically spaced constraining walls are arranged at intervals in the direction, and a cylindrical constraining wall is connected to the upper end of the thin reversing piece. It has been found that the main technical problem is achieved by a uniquely shaped container lid formed with a plurality of pressing ribs extending in the direction.

That is, according to the present invention, the synthetic resin container lid that achieves the main technical problem includes a circular 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 the synthetic resin container lid in which the locking protrusion is formed,
A plurality of thin inverted pieces extending upward from the lower 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 over the top wall are spaced apart in the circumferential direction. pieces are arranged, the upper end of the thin walled inverted piece is connected to the cylindrical restraining wall, the inner peripheral surface of the restraining wall located in the thin inversion pieces adjacent in the circumferential direction and the central axis a plurality of pressing ribs extending in a direction are formed,
When the thin-walled reversal piece is turned over so as to extend downward from the lower 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, the restraint wall is The composition is characterized in that the outer peripheral surface of the skirt wall is pressed through the thin inverted piece in the region where the thin inverted piece is present, and the pressing rib is pressed in the region where the thin inverted piece does not exist. A resin container lid is provided.

Preferably, the locking projections are formed on the lower inner peripheral surface of the skirt wall, the allowed to the state extending from the connected lower end to the skirt wall allowed inverting the said thin inversion piece downwardly, the Each of the pressing ribs is pressed against at least the lower part of the outer peripheral surface of the skirt wall. The thin inversion pieces are arranged at equal intervals in the circumferential direction, and the circumferential widths of the thin inversion pieces are substantially the same, the number of the thin inversion pieces is n, and the circumferential direction of the thin inversion pieces When the width w, the adjacent circumferential spacing of the thin inversion pieces and g, and n × w = 0.8 × n × g to 6.0 × n × g for are preferred. In a preferred embodiment, slits extending from the lower end of the skirt wall upward in the central axis direction are formed at equal intervals in the circumferential direction at the lower part of the skirt wall , and the number of slits is the number of the thin-walled inversion pieces. In the circumferential direction, each of the slits is located at the center in the circumferential direction of each thin inversion piece. Conveniently, the lower portion of the skirt wall extends downward and inclines radially outward, and the locking ridge is formed on the inner peripheral surface of the lower portion of the skirt wall. An unsealing ring surrounding the constraining wall is provided, and an inner peripheral surface of the unsealing ring is connected to an outer peripheral surface of the constraining wall via one or a plurality of non-breaking connecting pieces and a plurality of breaking connecting pieces. Preferably they are connected.

  The synthetic resin container lid of the present invention can be manufactured by injection or compression molding without requiring additional steps such as cutting. In the synthetic resin container lid of the present invention, when the container lid is attached to the mouth / neck portion of the container, the thin-walled inversion piece extends upward and the restraint wall is separated upward from the skirt wall. In this state, the top wall and the skirt wall are forced downward to lock the locking ridge formed on the inner peripheral surface of the skirt wall to the locking jaw of the mouth and neck, and then the thin inverted piece is inverted. Thus, the constraining wall can surround the skirt wall in a state of extending downward, so that the container lid can be attached to the mouth and neck with a relatively small plugging force. In the state where the container lid is attached to the mouth and neck, the restraint wall surrounds the skirt wall, and in the region where the thin wall inversion piece does not exist, the pressing rib disposed on the restraint wall acts on the outer peripheral surface of the skirt wall. Therefore, the container lid is maintained sufficiently securely in the mouth and neck. When opening the mouth and neck, it is necessary to re-invert the thin inverted piece to return it to its original state, but the thin inverted piece is not a continuous cylindrical shape in the circumferential direction but spaced in the circumferential direction. Due to the formation of a plurality, even if the stress that causes the thin-walled reversal piece to return to its original state does not remain due to so-called stress relaxation, the thin-walled reversal piece can be re-reversed easily enough to Can be separated from the skirt wall upwards, so that the container lid can be detached from the mouth and neck easily.

The perspective view which shows the synthetic resin container lid comprised according to this invention. The front view of the container lid shown in FIG. FIG. 2 is a plan view of the container lid illustrated in FIG. 1. Sectional drawing of the container lid shown in FIG. Sectional drawing for demonstrating the mode which equips the container neck shown in FIG. 1 thru | or 4 with the mouth neck part of a container. Sectional drawing for demonstrating the mode which equips the container neck shown in FIG. 1 thru | or 4 with the mouth neck part of a container. Sectional drawing for demonstrating the mode which detach | leaves the container lid shown in FIG. 1 thru | or FIG. 4 from the mouth neck part of a container. Sectional drawing for demonstrating the mode which detach | leaves the container lid shown in FIG. 1 thru | or FIG. 4 from the mouth neck part of a container.

  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 to 4, a synthetic resin container lid, generally designated by numeral 2, constructed in accordance with the present invention is integrally molded from an appropriate synthetic resin such as polyethylene or polypropylene by injection or compression molding. be able to. The container lid 2 includes a circular top wall 4 and a substantially cylindrical skirt wall 6 depending from the periphery of the top wall 4. A lower portion of the skirt wall 6 is inclined radially outwardly downward, and a locking protrusion 8 is formed on the inner peripheral surface of the lower portion. Furthermore, a plurality of (in the illustrated embodiment, 10) slits 10 extending upward from the lower end are disposed at equal intervals in the circumferential direction at the lower portion of the skirt wall 6. Each of the slits 10 extends to the upper end of the inclined lower portion of the skirt wall 6, and the locking ridge 8 is continuously extended in the circumferential direction except for a portion where the slit 10 exists.

The container lid 2 further has a thin inversion piece 12 extending upward from the lower end connected to the outer peripheral surface of the skirt wall 6 or the boundary between the outer peripheral surface of the skirt wall 6 and the upper surface of the top wall 4 beyond the top wall 4. It is important that a plurality are arranged at intervals in the circumferential direction. In the illustrated embodiment, each thin reversal piece 12 corresponds to each slit 10 of the skirt wall 6, and more specifically, each of the slits 10 is centered in the circumferential direction of each thin reversal piece 12 in the circumferential direction. 10 are arranged at equal intervals in the circumferential direction, and extend upward from the lower end connected to the upper part of the outer peripheral surface of the skirt wall 6 beyond the top wall 4. As will be described later, from the viewpoint of ease of detaching the container lid 2 from the mouth / neck portion of the container, the number of thin inverted pieces 12 formed at equal intervals in the circumferential direction is n, and the thin inverted pieces N × w = 0.8 × n × g to 6.0 × n × g, i.e., thin wall, where w is the circumferential width of each of 12 and g is the circumferential interval between adjacent thin-walled inversion pieces 12 It is preferable that the existence area of the reversal piece 12 is about 0.8 to 6.0 times the non-existence area. The thickness of each thin reversal piece 12 may be about 0.3 to 0.5 mm. A cylindrical constraining wall 14 is connected to the upper end of the thin inverted piece 12. It is important that the inner circumferential surface of the constraining wall 14 is formed with pressing ribs 16 extending in the central axis direction at intervals in the circumferential direction. The pressing rib 16 is conveniently formed corresponding to each of the gaps between the adjacent thin-walled inversion pieces 12 and is positioned at the circumferential center of the gap. The protruding height in the radial direction of the pressing rib 16 may be substantially the same as the thickness of the thin-walled reversal piece 12. In the illustrated embodiment, the pressing rib 16 is formed in the lower part of the inner peripheral surface of the restraining wall 14. An annular ridge 18 is formed at the upper end of the inner peripheral surface of the restraining wall 14.

In the illustrated embodiment, an unsealing ring 20 surrounding the restraining wall 14 is also provided. The inner peripheral surface of the unsealing ring 20 is connected to the outer peripheral surface of the constraining wall 14 by a non-breaking connecting piece 22 in a specific angle region that is preferably about 10 to 40 degrees. In regions other than the specific angle region, the outer peripheral surface of the restraint wall 14 and the inner peripheral surface of the unsealing ring 20 are connected by a plurality of fracture connecting pieces 24 arranged at appropriate intervals in the circumferential direction. Yes. The fracture connecting piece 24 is not disposed on the diametrically opposite side of the specific angle region, that is, on the diametrically opposite side of the non-breaking connecting piece 22, and the container neck 26 (see FIG. 5), as will be described later. When the container lid 2 is detached from the above, it is advantageous that the finger can be easily and easily hooked on the diametrically opposite side of the specific angle region in the opening ring 20.

  Next, with reference to FIG. 5A thru | or D, the style which mounts | wears with the said container lid 2 in the mouth neck part 26 of a container is demonstrated. The container to which the container lid 2 is applied and which can be formed from glass or an appropriate synthetic resin has a mouth-and-neck part 26 that is generally cylindrical, and is locked to the upper end of the outer peripheral surface of the mouth-and-neck part 26. A chin portion 28 is formed. When mounting the container lid 2 on the mouth / neck portion 26, a mounting tool 28 including a columnar inner member 30 and a cylindrical outer member 32 surrounding the inner member 30 is used. The inner member 30 and the outer member 32 of the mounting tool 28 are moved up and down separately.

  When the container lid 2 is attached to the mouth / neck portion 26 of the container, as shown in FIG. 5A, the container lid 2 is first fitted on the mouth / neck portion 26, and the inner member 30 of the attachment tool 28 is used as the container lid 2. The outer member 32 is positioned to face the restraining member 14 of the container lid 2. Then, as clearly understood by comparing FIGS. 5A and 5B, the inner member 30 is lowered to force the top wall 4 of the container lid downward, and the inner surface of the top wall 4 is the bottom surface of the container. It is pressed against the upper surface of the mouth / neck portion 26. The lower portion of the skirt wall 6 is expanded outward in the radial direction, and the locking protrusion 8 formed on the lower portion of the inner peripheral surface is positioned below the locking jaw portion 28 of the mouth and neck portion 26. In the state shown in FIGS. 5A and 5B, the lower part of the skirt wall 6 can be expanded sufficiently radially outward, and the pressing force required to lower the top wall 4 is not excessive. . If desired, when the inner member 30 is lowered to the position illustrated in FIG. 5B, the outer member 32 can also be lowered to the position illustrated by the two-dot chain line in FIG. 5B. Thereafter, as will be understood by referring to FIGS. 5C and 5D in conjunction with FIG. 5B, the outer member 32 is lowered and the restraint wall 14 is gradually lowered. At this time, the thin-walled reversal piece 12 is gradually reversed from the state of extending upward between the skirt wall 6 and the restraint wall 14 to the state of extending downward. Then, as shown in FIG. 5D, when the thin-walled reversal piece 12 is completely reversed, the restraint wall 14 is lowered to the position surrounding the skirt wall 6 and is expanded radially outward. The lower portion of the skirt wall 6 is forcibly displaced inward in the radial direction, and the locking ridge 8 formed on the lower inner peripheral surface of the skirt wall 6 is locked to the locking jaw portion 28 of the mouth-and-neck portion 26. I'm damned. In the region where the thin wall inversion piece 12 exists, the restraint wall 14 is brought into close contact with the outer peripheral surface of the skirt wall 6 via the thin wall inversion piece 12, and in the region where the thin wall inversion piece 12 does not exist, the lower portion of the inner peripheral surface of the restraint wall 14 The pressing rib 16 formed on the outer peripheral surface of the skirt wall 6 is pressed to the lower portion of the skirt wall 6, that is, the lower portion where the locking protrusion 8 is formed on the inner peripheral surface. Thus, the skirt wall 6 is restrained sufficiently reliably by the restraining wall 14 in the state shown in FIG. 5D, so that the container lid 2 is securely attached to the mouth and neck 26 of the container and seals the mouth and neck 26.

  When the container neck 2 is detached from the container neck 26 and the container 26 is opened, as shown in FIGS. 6A and 6B, the opening ring 20 is formed on the diametrically opposite side of the non-breaking connecting piece 22. A finger is put on the non-breaking connection piece 22 to turn upward with the turning start point. At this time, it is clearly shown that the breaking connection piece 24 has been broken, and thus the container lid 2 has been opened. When the opening ring 20 is swung further upward, as shown in FIG. 6C, the constraining wall 14 is partially displaced upward and separated from the outer peripheral surface of the skirt wall 6 upward. At this time, some of the thin-walled reversal pieces 12 are re-inverted so as to extend upward. Since the thin reversal pieces 12 are not continuously cylindrical in the circumferential direction but are arranged at intervals in the circumferential direction, the thin reversal pieces 12 are restored to a state extending upward to the thin reversal pieces 12 due to stress relaxation. Even when the reversing stress does not remain, the constraining ring 20 can be swung upward by re-inverting the thin-walled reversing piece 12 without requiring an excessive force. In the state shown in FIG. 6C, the restraint of the skirt wall 6 by the restraint wall 14 becomes local, and at least a part of the lower portion of the skirt wall 6 is elastically displaced radially outwardly easily, and accordingly. The entire container lid 2 can be removed from the mouth-and-neck part 26 of the container sufficiently easily and the mouth-and-neck part 26 can be opened.

2: Container lid 4: Top wall 6: Skirt wall 8: Locking ridge 10: Slit 12: Thin wall inversion piece 14: Restraint wall 16: Pressing rib 20: Opening ring 22: Non-breaking connection piece 24: Breaking connection piece 26 : Mouth and neck of container 28: locking jaw

Claims (6)

In a synthetic resin container lid comprising a circular top wall and a skirt wall depending from the peripheral edge 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 upward from the lower 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 over the top wall are spaced apart in the circumferential direction. pieces are arranged, the upper end of the thin walled inverted piece is connected to the cylindrical restraining wall, the inner peripheral surface of the restraining wall located in the thin inversion pieces adjacent in the circumferential direction and the central axis a plurality of pressing ribs extending in a direction are formed,
When the thin-walled reversal piece is turned upside down so as to extend downward from the lower 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, the restraint wall is The composition is characterized in that the outer peripheral surface of the skirt wall is pressed through the thin inverted piece in the region where the thin inverted piece is present, and the pressing rib is pressed in the region where the thin inverted piece does not exist. Resin container lid. The engaging protrusion is formed on the lower inner peripheral surface of the skirt wall, the allowed to the state extending downward from said thin inverted piece connected lower end in allowed inverted to the skirt wall, of the press rib The synthetic resin container lid according to claim 1, wherein each is pressed against at least a lower portion of the outer peripheral surface of the skirt wall. The thin inversion pieces are arranged at equal intervals in the circumferential direction, and the circumferential widths of the thin inversion pieces are substantially the same, the number of the thin inversion pieces is n, and the circumferential direction of the thin inversion pieces the width w, when the adjacent circumferential spacing of the thin inversion pieces and g, and n × w = 0.8 × n × g to 6.0 × n × g, the synthesis according to claim 1 or 2, wherein Resin container lid. The lower part of the skirt wall is formed with slits extending from the lower end of the skirt wall upward in the central axis direction at equal intervals in the circumferential direction, and the number of the slits is the same as the number of the thin-walled inversion pieces, The synthetic resin container lid according to claim 3, wherein each of the slits in the circumferential direction is located at the center in the circumferential direction of each of the thin inverted pieces.   5. The synthetic resin according to claim 4, wherein the lower portion of the skirt wall extends downward and inclines radially outward, and the locking protrusion is formed on an inner peripheral surface of the lower portion of the skirt wall. Container lid.   An unsealing ring surrounding the constraining wall is provided, and an inner peripheral surface of the unsealing ring is connected to an outer peripheral surface of the constraining wall via one or a plurality of non-breaking connecting pieces and a plurality of breaking connecting pieces. The synthetic resin container lid according to any one of claims 1 to 5, which is connected.

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