JP6503215B2 - Method and apparatus for attaching a container lid to the mouth and neck of a container - Google Patents

Description

  The present invention relates to a method and apparatus for attaching a container lid to a mouth and neck by fitting the container lid on the mouth and neck of the container and forcing the container cover downward, more specifically, an operation unit is attached to the outer peripheral surface of the skirt wall Connected to the other end of a plurality of thin wall inversion pieces and thin wall inversion pieces extending from one end connected to the boundary region between the outer peripheral surface of the skirt wall or the outer peripheral surface of the skirt wall and the upper surface of the top wall The present invention relates to a method and apparatus for attaching a container lid in a form having a restraining wall to the mouth and neck of a container.

  According to Patent Document 1 below, a stoppered synthetic resin container which can be separated from the mouth and neck of the container without using an opening device although the mouth and neck of the container can be sufficiently securely sealed. In addition to a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall as a lid, it is connected to a cylindrical restraint wall connected to the outer peripheral surface of the skirt wall via a frangible connection, and to the skirt wall There is disclosed a synthetic resin container lid including an operating portion extending downward from the upper end of the upper portion and beyond the skirt wall. When attaching the container lid to the mouth and neck of the container, the skirt wall is fitted onto the mouth and neck and forced downward, and the engagement ridge formed on the inner circumferential surface of the skirt wall Engaging the engagement ridge formed on the outer peripheral surface of the sleeve and forcing the restraint wall downward with respect to the skirt wall, thereby breaking the connection portion and lowering the restraint wall to a state surrounding the skirt wall . When the container lid is removed from the mouth neck of the container and the mouth neck is opened, a finger is put on the operation portion to force radially outward and upward, thus partially displacing the restraint wall upward And the skirt wall is partially displaced upward, and the entire container lid is detached from the mouth and neck.

JP 2012-201399 A

  Thus, the conventional container lid as described above is still not completely satisfactory, and (1) when the container lid is removed from the mouth and neck of the container, the restraining wall is radially outward and upward (2) When the container lid is removed from the mouth and neck of the container, the restraining wall separated from the skirt wall is separated from the top wall and the skirt wall when the container lid is removed from the neck of the container. There is a problem to be solved that there is a risk of becoming scraps.

As a result of intensive investigations, the inventors of the present invention have the problems as described above including a circular top wall and a skirt wall depending from the periphery of the top wall, and a locking ridge is provided on the inner peripheral surface of the skirt wall. A plurality of thin-walled inverted pieces extending from one end connected to the outer peripheral surface of the skirt wall or the boundary portion between the outer peripheral surface of the skirt wall and the upper surface of the top wall are spaced in the circumferential direction is disposed, the other end of said thin inverted piece connected restraint wall, the specific portion in the circumferential direction of the constraining walls min sectional some have the Ri Contact connected by weakening breakable, the constraint Locked projections projecting radially outward from the outer peripheral surface of the constraining wall are formed on both circumferential sides of the specific portion of the wall, and the skirt wall is circumferentially fixed to the specific portion of the constraining wall. Extending radially from the outer circumferential surface of the skirt wall at a position aligned with the It is possible to solve the problem by means of a synthetic resin container lid in which the operation portion is connected via the connection portion, and the operation portion is formed with locking projections projecting radially inward on both sides in the circumferential direction of the connection piece Found out. However, when attaching such a container lid to the mouth and neck of a container having a cylindrical mouth and neck having a locking ridge formed on the outer peripheral surface, the following problems occur. Was found to be prone to occur. In other words, the locking ridge formed on the inner peripheral surface of the skirt wall is elastically passed over the locked ridge formed on the outer peripheral surface of the mouth and neck and is locked to this. There is a tendency for the skirt wall to be subjected to a force that causes the lower part to be displaced radially outward on the skirt wall, which causes the operating portion to be inclined radially outwardly downward. Due to this, it becomes difficult to lock the locked projection formed on the constraining wall and the locking projection formed on the operation portion.

  The present invention has been made in view of the above-described facts, and the main technical problem thereof is that a locking projection is formed on the outer peripheral surface of the container lid of the improved form as described above. It is an object of the present invention to provide a mounting method and device which solves the above-mentioned problems when mounting on the neck and neck of a container having a cylindrical neck and neck.

  As a result of further investigations, the inventors of the present invention have made the above main technical problems by lowering the constraining wall relatively with respect to the skirt wall while correcting the operating portion from the radially outer side to the radially inward direction. It has been found that it can be achieved.

That is, according to the first aspect of the present invention, as a mounting method for achieving the above-mentioned main technical problems, a circular top wall and a skirt wall depending from the periphery of the top wall are provided. A locking ridge is formed on the outer circumferential surface of the skirt wall or a thin inverted piece extending from one end connected to the boundary between the outer circumferential surface of the skirt wall and the upper surface of the top wall in the circumferential direction are plurality disposed spacedly, the other end of said thin inverted piece connected restraint wall, the specific portion in the circumferential direction of the constraining walls minute cross one have is connected by weakened portion breakable has been our is, in the circumferential direction on both sides of the specific site of the restraining walls are formed to be locking projections projecting radially outward from the outer peripheral surface of the restraining wall, the said skirt wall in the circumferential direction The outer circumferential surface of the skirt wall at a position aligned with the specific portion of the restraint wall The operation portion is connected via a connecting piece that extends in the radial direction, and the operating portion is formed with a locking member that protrudes inward in the radial direction on both sides in the circumferential direction of the connection piece. A method of mounting a container lid made of a container having a cylindrical neck portion on the outer peripheral surface of which a locking projection is formed on the neck portion of the container,
The skirt wall is fitted on the neck and is lowered relative to the neck and the locking ridge formed on the skirt is formed on the neck And a step of locking the locking ridge to the locking ridge, and after locking the locking ridge to the locking ridge, the restraint wall is fixed to the skirt wall while correcting the operation portion radially inward. Moving the locked projection formed on the restraint wall relative to the lock relative to the locking projection formed on the operation portion;
A method is provided, characterized in that the method comprises:

According to a second aspect of the present invention, as a mounting device for achieving the above-mentioned main technical problems, a circular top wall and a skirt wall depending from the periphery of the top wall are provided, and the inner peripheral surface of the skirt wall Locking ridges are formed, and thin-walled inverted pieces extending from one end connected to the outer peripheral surface of the skirt wall or the boundary portion between the outer peripheral surface of the skirt wall and the upper surface of the top wall are circumferentially spaced are plural arranged at a, to the other end of said thin inverted piece connected restraint wall, the specific portion in the circumferential direction of the constraining walls minute cross one have is connected by weakening rupturable Contact is, in the circumferential direction on both sides of the specific site of the restraining walls are formed to be locking projections projecting radially outward from the outer peripheral surface of the restraining wall, the restraint in the circumferential direction the skirt walls From the outer peripheral surface of the skirt wall at a position aligned with the specific portion of the wall The operation unit is connected through the connection piece extending in the direction, and the synthetic resin container is formed with the locking projections projecting radially inward on both sides in the circumferential direction of the connection piece. The lid is a device mounted on the mouth and neck of a container having a cylindrical mouth and neck having a locking projection formed on the outer peripheral surface thereof,
A central pressing member having a flat circular lower surface abutted against the upper surface of the top wall; a side wall having an annular lower surface surrounding the central pressing member and abutted against the upper edge of the restraint wall; The outer pressing member has a correction wall extending beyond the lower surface, and the center pressing member and lifting and lowering means for raising and lowering the outer pressing member, the inner circumferential surface of the correction wall is Extending downward from the outer peripheral edge of the lower surface, the top pressing wall and the skirt wall are lowered relative to the mouth and neck by lowering the central pressing member, and the restraint wall is lowered by lowering the outer pressing member. Is lowered and the operating portion is corrected radially inward by the correction wall.
An apparatus is provided, characterized in that:

  Preferably, the upper half of the inner circumferential surface of the correction wall is a vertically extending cylindrical shape, and the lower half is a frusto-conical shape extending downward and radially outward. It is preferable that the center pressing member and the outer pressing member are separately movable up and down independently, and that limiting means for limiting the lowering of the outer pressing member with respect to the center pressing member to a predetermined position is provided. .

  According to the method and apparatus of the present invention, the locking ridge formed on the inner circumferential surface of the skirt wall resiliently rides over the locked ridge formed on the outer circumferential surface of the mouth and neck. Even when the operating portion is inclined radially outward downward when being locked, the restraint wall is fixed to the skirt wall while correcting the operating portion radially outward from the radially outer side. As a result of the relative lowering, the locked projection formed on the restraining wall is sufficiently securely locked to the locking projection formed on the operation portion.

FIG. 6 is a perspective view showing a primary molding state (a state before adding a secondary molding) of a typical example of a synthetic resin container lid attached to the mouth and neck of the container by the method and apparatus of the present invention. The bottom view of the container lid illustrated in FIG. Sectional drawing in line III-III of FIG. Sectional drawing which shows the initial state of secondary processing given to the container lid illustrated in FIG. Sectional drawing which shows the final state of secondary processing given to the container lid illustrated in FIG. Sectional drawing which shows the container lid completed by giving secondary processing to the container lid illustrated in FIG. The fragmentary sectional view which illustrates the modification of the container lid illustrated in FIG. The fragmentary sectional view which illustrates the other modification of the container lid illustrated in FIG. Sectional drawing which shows the initial state of the mounting process of mounting | wearing the opening neck of a container with the container lid illustrated in FIG. FIG. 7 is a cross-sectional view showing an intermediate state of the mounting step of mounting the container lid illustrated in FIG. 6 on the mouth and neck of the container. FIG. 7 is a cross-sectional view showing a late intermediate state of the mounting process of mounting the container lid illustrated in FIG. 6 on the mouth and neck of the container. FIG. 7 is a cross-sectional view showing a final state of a mounting process of mounting the container lid illustrated in FIG. 6 on the mouth and neck of the container. FIG. 7 is a cross-sectional view showing the container lid illustrated in FIG. 6 attached to the mouth and neck of the container. FIG. 7 is an oblique 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 state at the time of detaching the container lid illustrated in FIG. 6 from the opening neck of a container. FIG. 7 is a perspective view showing a final state when the container lid shown in FIG. 6 is detached from the mouth and neck of the container. Sectional drawing which shows the final state at the time of detaching the container lid illustrated in FIG. 6 from the opening neck of a container.

  Hereinafter, preferred embodiments of the mounting method and apparatus configured according to the present invention will be described in more detail with reference to the attached drawings.

  FIGS. 1 to 3 show a typical example of a synthetic resin container lid mounted on the mouth and neck of the container according to the method and apparatus of the present invention as primary molded by injection molding or compression molding using a molding die. In other words, the state before secondary molding described later is applied is illustrated. The illustrated container lid, generally indicated by the numeral 2, which can be integrally injected or compression molded from an appropriate synthetic resin such as polyethylene or polypropylene, comprises a top wall 4 and a skirt wall 6 depending from the periphery of the top wall 4 Equipped with The top wall 4 is circular in plan view, and has a flat central portion and a peripheral edge that slopes downward in the radial direction. As clearly shown in FIG. 3, at the inner peripheral edge of the top wall 4, there are disposed two annular seal pieces extending downward, namely, an inner seal piece 8 and an outer seal piece 10.

  The skirt wall 6 has a substantially cylindrical shape as a whole. An annular engagement protrusion 12 is formed at the lower end of the inner peripheral surface of the skirt wall 6. As clearly understood by reference to FIGS. 1 and 3, the lower end of the skirt wall 6 is formed with a plurality of, in the illustrated case, twelve slits 14 extending upward from the lower end of the skirt wall 6 It is done. On the outer peripheral surface of the skirt wall 6, a plurality of recessed portions 16 extending from the lower end to the upper end of the skirt wall 6 are arranged at intervals in the circumferential direction, five in the illustrated case. The upper end of each recess 16 is connected to the lower end of the thin inverted piece 18. Each of the thin-walled inverted pieces 18 extends upward beyond the top wall 4. If desired, the lower end of the thin inverted piece 18 can be replaced with the outer peripheral surface of the skirt wall 6 and connected to the boundary region between the skirt wall 6 and the top wall 4.

  A restraint wall 20 is connected to the upper end of the thin inverted piece 18. The restraint wall 20 has a substantially annular shape, and the specific portion 22 in the circumferential direction is defined by a breakable weakened portion 24 formed of a bridge piece having a small cross-sectional area. If desired, the bridging piece constituting the weakening portion 24 can be formed with, for example, a very weak portion whose cross-sectional area is reduced at the center in the circumferential direction. Furthermore, although it is possible to divide the restraint wall 20 at the specific portion 22 without arranging the weakened portion 24, as described later, when the restraint wall 20 is lowered relative to the skirt wall 6, the restraint wall 20 is twisted. Alternatively, it is preferable to dispose the weakened portion 24 at the specific portion 22 because excessive expansion is sufficiently reliably avoided. In the illustrated embodiment, the weakening portion 24 is disposed at the upper end portion of the restraint wall 20 in the axial direction, but may be disposed at an intermediate portion of the restraint wall 20 in the axial direction. Engaging protrusions 26 that project radially outward are formed on both sides of the specific portion 22 in the circumferential direction. The circumferential inner surface of each of the locking projections 26 (i.e., the side surface adjacent to the specific portion 22) extends radially, but the circumferential outer surface of each of the locking projections 26 (i.e., away from the specific portion 22) The side surfaces) are inclined surfaces extending radially outward and circumferentially outward. As can be 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 locations where the thin walled inversion pieces 18 are present, Accordingly, at such a portion, the inner diameter of the restraining wall 20 locally corresponds to the outer diameter of 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. The slip is slightly increased from the above-mentioned outer diameter.

  The operation portion 30 is connected to the outer peripheral surface of the skirt wall 6 via a connection piece 28 projecting radially outward. The circumferential position of the connection piece 28 is aligned with the circumferential position of the specific portion 22 of the restraint wall 20. The operation unit 30 is composed of a base 32 and a ring 34, and the inner surface of the base 32 is connected to the projecting end of the connection piece 28. The bases 32 extend circumferentially on both sides, and radially inwardly projecting locking projections 36 are formed on the inner surfaces of both ends of the bases 32 located on both sides of the connection piece 28. The circumferential outer surface of each of the locking projections 36 (i.e. the side surface remote from the connecting piece 28) extends radially, but the circumferential inner surface of each locking projection 36 (i.e. the side surface adjacent to the connecting piece 28) ) Is an inclined surface which inclines inward in the circumferential direction toward the inside in the radial direction. A ring 34 depending from the base 32 is substantially annular.

  In the illustrated container lid 2, the following secondary forming is performed on the primary formed container lid 2 in the form illustrated in FIGS. 1 to 3. As shown in FIG. 4, the top wall 4 of the container lid 2 is supported by a support means 38 which may be, for example, a cylindrical support anvil having an upper surface brought into contact with the central portion of the inner surface of the top wall 4. And a pressing block 40 fixed at the lower end of the upper wall of the restraining wall 20 abuts on the upper edge of the restraining wall 20. Then, 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-walled reversing pieces 18 is folded at a substantially intermediate portion in the vertical direction to be deformed into a U-shape. When the restraining wall 20 is lowered to the position shown in FIG. 5, the restraining wall 20 surrounds the upper portion of the skirt wall 6, and the upper end edge of the restraining wall 20 is substantially flush with the upper surface of the top wall 4. However, the restraining wall 20 is located above the operation portion 30 attached to the skirt wall 6, and accordingly, the locked projection 26 formed on the restraining wall 20 is 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 reversing piece 18 do not surround the lower portion of the skirt wall 6 having the locking ridge 12 formed on the inner circumferential surface. FIG. 6 illustrates the container lid 2 after being subjected to secondary processing. If desired, an annular member having an opening corresponding to the top wall 4 as the pressing block 40 is used to lower the upper end of the restraint wall 20 to a position slightly lower than the top surface of the top wall 4. You can also.

  A modification of the container lid 2 is shown in FIG. In this modification, the locally thin wall line 42 is defined by forming a laterally extending groove across the entire width at the vertical middle portion of the outer surface of each of the thin walled inverted pieces 18 so that the restraining wall 20 is formed. When lowered, each of the thin-walled inversion pieces 18 is bent by the local thin-walled line 42. As understood by comparing and referring to FIGS. 6 and 7, in the absence of the locally thin-walled line 42, as indicated by the two-dot chain lines exaggeratingly in FIGS. Although the constraining wall 20 tends to be displaced from the required position due to the elastic restoring force generated in each of the thin-walled inversion pieces 18 by each being folded, it is possible to localize each of the thin-walled inversion pieces 18. When the thin line 42 is present, the elastic restoring force generated in each of the thin inverted pieces 18 can be made sufficiently small, and the displacement of the constraining wall 20 can be avoided as much as possible.

  FIG. 8 shows still another modification of the container lid 2. In the modification illustrated in FIG. 8, the outer circumferential surface upper end of the skirt wall 6 (a portion slightly above the portion where one end of the thin inverted piece 18 is connected) extends continuously in the circumferential direction (or The ridges 44 extend circumferentially in a plurality of portions corresponding to portions of the inner circumferential surface of the restraining wall 20 which are not displaced radially outward, that is, an angle region where the thin inverted pieces 18 do not exist. It is formed. On the other hand, circumferentially extending grooves 46 are formed in a plurality of portions of the inner peripheral surface of the constraining wall 20 which are not displaced radially outward, that is, in an angle region where the thin inverted pieces 18 do 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 ridge 44 of the skirt wall 6 engage with each other. Thus, the restraint wall 20 is moored in the lowered position. If desired, grooves may be formed in the skirt wall 6 and ridges may be formed in the restraining wall 20.

  Next, a preferred embodiment of the method and apparatus of the present invention, in which the secondary processing container lid 2 shown in FIG. 6 is attached to the mouth and neck of the container to seal the mouth and neck, will be described. Referring to FIG. 9, the container lid 2 is formed of an appropriate synthetic resin such as polyethylene terephthalate, a thin metal plate such as an aluminum-based alloy sheet, or the mouth and neck 48 of the container (FIG. Applied to the neck only). An annular engaged protrusion 50 is formed on the outer peripheral surface upper portion of the mouth and neck portion 48 which is generally cylindrical. In the illustrated mouth and neck portion 48, an annular groove 51 is formed at an axially intermediate portion of the locking projection 50 in order to reduce the amount of material required. An annular support ring 52 located below the locking ridge 50 is also formed on the outer peripheral surface of the mouth and neck portion 48. As is well known, the support ring 52 is used to properly transport the container.

  When attaching the container lid 2 to the mouth and neck portion 48 of the container, the upper end of the mouth and neck portion 48 of the container supported on an appropriate support (not shown) as shown in FIG. A container lid 2 is fitted, and a mounting device, generally indicated at 54, is positioned as required for such container lid 2. 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 and lowering mechanism (not shown), and can be separately lifted and lowered independently. In the illustrated embodiment, the central pressing member 56 comprises a circular bottom wall 60 and a cylindrical upstanding wall 62 extending upwardly from the periphery of the bottom wall 60. The bottom wall 60 defines a substantially horizontally extending circular lower surface 64. 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 upstanding wall 62 of the central pressing member 56, and the central pressing member 56 is positioned within 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 the lower end of the side wall 66 defines a substantially horizontally extending annular lower surface 70. At the upper end of the side wall 66, there is formed an upper wall 72 in which a through opening is formed at the center. 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 is a cylindrical shape extending substantially vertically, but the lower half is inclined radially outward downward It has a truncated cone shape.

  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 a container lid. (Ie, the lower surface 70 of the outer pressing member 58 is not in contact with the upper edge of the constraining wall 20). Then, the central pressing member 56 and the outer pressing member 58 are simultaneously lowered to the position shown in FIG. Thus, the container lid 2 is forced downward relative to the mouth neck 48 of the container, as is clearly understood by comparing and referring to FIGS. 9 and 10, and the upper end of the mouth neck 48 is the container lid. The mouth and neck portion 48 is sealed between the inner seal piece 8 and the outer seal piece 10 which are formed on the inner surface or lower surface of the top wall 4 of the second embodiment, and also inside the skirt wall 6 of the container lid 2 The locking ridge 12 formed on the circumferential surface resiliently rides over the locked ridge 50 formed on the outer peripheral surface of the mouth and neck portion 48 and is locked thereto.

  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 edge of the restraining wall 20 of the container lid 2. Further, a specific angle portion of the inner peripheral surface of the correction wall 68 attached to the outer pressing member 58 is positioned on the skirt wall 6 of the container lid 2 in proximity to or in contact with the outer surface of the operation portion 30. As described above, the locking ridge 12 formed on the inner peripheral surface of the skirt wall 6 of the container lid 2 resiliently rides over the locked ridge 50 formed on the outer peripheral surface of the mouth and neck portion 48. In this case, the skirt wall 6 acts on the skirt wall 6 so as to displace the lower portion thereof radially outward, which causes the operating portion 30 to move radially outward in the downward direction. Tend to be inclined toward the opposite direction (this makes it difficult to lock the locking projection 26 and the locking projection 36 which need to be mutually engaged as described later) ). However, when the state shown in FIG. 10 is changed 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 as described above is the skirt wall 6 of the container lid 2. The control unit 30 is in contact with or close to the operation unit 30 and positioned outside thereof, whereby the inclination of the operation unit 30 is corrected. When the outer pressing member 58 is lowered to the position shown in FIG. 12, the pressing force applied from the lower surface 70 of the outer pressing member 58 to the restraint wall 20 causes the restraint wall 20 to be at the position shown in FIG. It is lowered to a position that encloses the half and reliably prevents the lower half of the skirt wall 6 from being displaced radially outward to make the attachment of the container lid 2 to the mouth and neck 48 rigid. . At this time, the connection 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 the anchored portion formed on the restraining wall 20. The projection 26 and the locking projection 36 formed on the operating portion 30 are mutually locked (see FIGS. 1 and 2). Each of the thin-walled inversion pieces 18 is deformed from the state of being folded in a U-shape to the state of 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 abuts on the upper end of the upright wall 62 of the central pressing member 56, whereby the outer pressing member 58 (The upper wall 72 of the outer member 58 and the upstanding 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) Make up the means). As described above, when the container lid 2 is attached to the mouth and neck portion 48 as required, the container on which the container lid 2 is attached is removed from the attaching device. FIG. 13 shows the container lid 2 attached to the mouth and neck portion 48 of the container as required.

  When the container lid 2 is removed from the mouth and neck portion 48 of the container and the mouth and neck portion 48 is opened, a finger is put on the ring 34 of the operation unit 30 to displace 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 32 of the operation unit 30 and the locking projection 26 disposed on the restraint wall 20. With this, the interlock with each other is released, and expansion of the restraining wall 20 is permitted. Accordingly, the radially outward displacement of the skirt wall 6, particularly the lower end thereof, is permitted, and the engagement ridges 12 formed on the lower end of the inner peripheral surface of the skirt wall 6 and the engagement of the mouth neck 48 The interlock with the ridges 50 is partially released, and the skirt wall 6 is partially displaced upward. If the pressure in the container is higher than the atmospheric pressure, the seal of the neck portion 48 is locally released when the partial rise of the skirt wall 6 is started, and the pressure in the container is released. It is prevented that 2 flies from the neck and neck 48 accidentally. Then, when the ring 34 is displaced upward and radially oppositely, the entire container lid 2 is disengaged from the neck 48 as clearly understood by referring to FIGS. The part 48 is opened.

  Although the preferred embodiments of the method and apparatus of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such embodiments, and various modifications can be made without departing from the scope of the present invention. Variations or modifications are possible. Also, although the method and apparatus of the present invention have been described for a specific container lid, the method and apparatus of the present invention may be, for example, as they are formed by primary processing without being subjected to secondary processing. The present invention can also be applied when the container lid of another form such as the container lid of the form as illustrated in 3 is attached to the mouth and neck of the container.

2: Container lid 4: Top wall 6: Skirt wall 12: Locking ridge 14: Slit 16: Recess 18: Thin walled piece 20: Restraint wall 22: Specific part 24: Weakened part 26: Locked protrusion 28: Connection Piece 30: Operation part 34: Ring 36: Locking projection 42: Local thin line 44: Projection 46: Groove 48: Neck 50: Locked projection 54: Mounting device 56: Center pressing member 58: Outside Pressing member 64: lower surface of center pressing member 66: side wall of outer pressing member 68: correction wall 70: lower surface of side wall

Claims (4)

A circular top wall and a skirt wall depending from the periphery of the top wall are provided, and a locking projection is formed on the inner peripheral surface of the skirt wall, the outer peripheral surface of the skirt wall or the outer peripheral surface of the skirt wall A plurality of thin inverted pieces extending from one end connected to the boundary between the upper surface and the upper surface of the top wall are arranged at intervals in the circumferential direction, and a restraining wall is provided at the other end of the thin inverted pieces. connected, a specific site in the circumferential direction of the constraining walls min sectional some have the Ri Contact connected by weakening breakable, in the circumferential direction on both sides of the specific site of the restraining wall from the outer peripheral surface of the restraining wall A radially outwardly projecting locking projection is formed, and the skirt wall radially extends 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 unit is connected via the connection piece, and the connection piece is connected to the operation unit. A container lid having a synthetic resin container lid on which locking projections projecting radially inward are formed on both sides in the circumferential direction, and a container having a cylindrical opening and neck on which a locking projection is formed on the outer peripheral surface How to put on the mouth and neck,
The skirt wall is fitted on the neck and is lowered relative to the neck and the locking ridge formed on the skirt is formed on the neck A step of locking to the locked protrusion, and
After the locking ridge is locked to the locked ridge, the restraint wall is lowered relative to the skirt wall while the operation portion is corrected radially inward to thereby restrain the restraint wall Locking the locked protrusion formed on the locking portion formed on the operation portion;
A method characterized by comprising. A circular top wall and a skirt wall depending from the periphery of the top wall are provided, and a locking projection is formed on the inner peripheral surface of the skirt wall, the outer peripheral surface of the skirt wall or the outer peripheral surface of the skirt wall A plurality of thin-walled inverted pieces extending from one end connected to the boundary between the upper surface and the upper surface of the top wall are arranged at intervals in the circumferential direction, and a restraining wall is provided at the other end of the thin-layered inverted pieces. connected, a specific site in the circumferential direction of the constraining walls min sectional some have the Ri Contact connected by weakening breakable, in the circumferential direction on both sides of the specific site of the restraining wall from the outer peripheral surface of the restraining wall A radially outwardly projecting locking projection is formed, and the skirt wall radially extends 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 unit is connected via the connection piece, and the connection piece is connected to the operation unit. A container lid having a synthetic resin container lid on which locking projections projecting radially inward are formed on both sides in the circumferential direction, and a container having a cylindrical opening and neck on which a locking projection is formed on the outer peripheral surface The device attached to the mouth and neck
A central pressing member having a flat circular lower surface abutted against the upper surface of the top wall; a side wall having an annular lower surface surrounding the central pressing member and abutted against the upper edge of the restraint wall; The outer pressing member has a correction wall extending beyond the lower surface, and the center pressing member and lifting and lowering means for raising and lowering the outer pressing member, the inner circumferential surface of the correction wall is It extends downward from the outer peripheral edge of the lower surface,
The central pressing member is lowered to lower the top wall and the skirt wall relative to the neck, and the outer pressing member is lowered to lower the restraint wall and the correction wall. The operating portion is corrected radially inward;
An apparatus characterized by   The apparatus according to claim 2, wherein the upper half of the inner circumferential surface of the correction wall is a vertically extending cylindrical shape, and the lower half is a frusto-conical shape extending downward and radially outward.   The center pressing member and the outer pressing member can be moved independently up and down independently, and limiting means is provided for limiting the lowering of the outer pressing member with respect to the center pressing member to a predetermined position. The device according to 3.