JP4068184B2 - Plastic cap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin cap that is used by being plugged into an opening of a container in which contents such as liquid are accommodated and can be easily detached from the opening of the container at the time of separate collection.
[0002]
[Prior art]
The container in which the contents such as the liquid are stored is sealed at its opening by, for example, a synthetic resin cap so that the contents do not leak. The synthetic resin cap is generally attached by being plugged into the container opening. When using a container in which the contents are present, the cap needs to be securely attached and not easily removed while maintaining a sufficiently secure seal against the container opening. On the other hand, after the contents are consumed, the cap is required to be easily removed from the opening of the container in order to separate and collect the resources for reuse of resources and environmental preservation.
[0003]
Examples of the synthetic resin cap for satisfying the above requirements include those disclosed in Japanese Utility Model Laid-Open Nos. 6-59247 and 7-8249. The synthetic resin cap disclosed in Japanese Utility Model Laid-Open No. 6-59247 is composed of a main body (spout port) and an upper lid (overcap). The main body is a discharge guide wall (a collar) standing upright on the top wall (top plate), a planned opening (opening) opened by a fractured part, and a container opening by standing down on the periphery of the top wall An outer mounting wall (outer peripheral portion) mounted on the outer mounting wall, and an outer cylinder projecting above the outer mounting wall and having a screw portion. The upper lid has a length that covers the outer cylinder and the outer mounting wall, and is provided with a screw part that can be screwed to the screw part of the outer cylinder, and is connected to the side wall through a hinge part so as to be freely opened and closed. A lid. The outer mounting wall of the main body is formed in a divergent shape. Alternatively, a plurality of cuts (cuts) are formed in the outer mounting wall. When the upper lid is screwed to the main body, the side wall presses the outer mounting wall, and the main body is mounted to the container opening.
[0004]
On the other hand, the synthetic resin cap disclosed in Japanese Utility Model Laid-Open No. 7-8249 is composed of a main body (nozzle combined plug), a reinforcing ring, and an upper lid (cap). The main body is formed of a soft synthetic resin, and includes a screw cylinder with a nozzle, and an inner and outer double cylinder portion that protrudes outward from a lower end of the screw cylinder with a nozzle and hangs down through a wall portion. The inner and outer double cylinder portions include an outer cylinder. A plurality of deep grooves are formed in the outer cylinder, and the bottom of the deep groove is formed into a thin portion that can be stretched or broken. The main body is mounted by fitting the inner and outer double cylinders into the container opening. The reinforcing ring includes a peripheral wall and a flange extending inward from the upper end edge of the peripheral wall. The reinforcing ring is attached to the main body by covering the outer wall of the outer cylinder of the inner / outer double cylinder part so as to be slidable in the vertical direction and placing the lower surface of the flange overhanging the upper surface of the wall part. The upper lid includes a top wall and a peripheral wall depending from the upper edge of the top wall. The upper lid is attached to the main body by screwing the peripheral wall onto the outer surface of the screw cylinder so that the lower end of the peripheral wall hangs down on the flange upper portion of the reinforcing ring.
[0005]
[Problems to be solved by the invention]
In the conventional synthetic resin cap disclosed in Japanese Utility Model Laid-Open No. 6-59247, when the upper lid is screwed to the main body, the side wall presses the outer mounting wall, the diameter is reduced, and the main body becomes the container opening. Since it is comprised so that it may be mounted | worn, the outstanding effect that a cap is firmly mounted | worn with respect to a container opening part, and does not remove easily is acquired. However, after the contents are consumed, in order to separate the cap from the container opening for separation and collection, the upper lid is attached to the main body attached to the container opening before the main body is removed from the container opening. Although it is necessary to rotate the screwed portion relative to the main body and remove it from the main body, there is a possibility that it is difficult to rotate the upper lid with respect to the main body because the side wall presses the outer mounting wall. That is, there is a possibility that the cap cannot be easily detached from the container opening during the separation and collection.
[0006]
On the other hand, in the conventional synthetic resin cap disclosed in Japanese Utility Model Publication No. 7-8249, the reinforcing ring covers the outer periphery of the outer cylinder of the main body and is fitted so as to be slidable in the vertical direction. Sometimes it is possible to remove the reinforcing ring by forcing it axially against the outer cylinder of the body. However, it is preferable that the gap between the reinforcing ring and the outer cylinder of the main body is small in view of the reduction of the reinforcing function, and therefore cannot be made too large. As a result, there is a possibility that a relatively large frictional resistance is generated with respect to the forced movement of the reinforcing ring in the axial direction with respect to the outer cylinder of the main body and cannot be easily detached. Furthermore, since this synthetic resin cap is composed of three parts: a main body, a reinforcing ring, and an upper lid, the manufacturing cost is increased, the number of assembly steps of the cap itself (and hence the assembly time), and the separation from the container opening. There is a technical problem that the number of man-hours (and therefore the separation time) increases.
[0007]
The present invention has been made on the basis of the above-mentioned facts, and the main purpose of the present invention is that when the container in which the contents are present is used, it is sufficiently attached to the opening of the container and is not easily detached, It is an object of the present invention to provide a novel synthetic resin cap that can be easily separated from a container opening at the time of fractional collection and can be manufactured at a relatively low cost.
[0008]
[Means for Solving the Problems]
In order to achieve the main object, according to the present invention, a main body and an upper lid that is detachably attached to the main body, the main body has a top wall and an annular outer side extending downward from the periphery of the top wall. A mounting wall, a scheduled opening portion formed on the top wall, an annular discharge guide wall extending upward from the periphery of the planned opening portion, and a cylindrical portion provided outside the discharge guide wall. The upper cover includes a top wall portion, a skirt portion extending downward from the periphery of the top wall portion, and a to-be-locked screw portion to be locked to the locking screw portion, On the inner peripheral surface of the outer mounting wall, a locking protrusion is formed which is locked to a locking jaw formed on the outer peripheral surface of the container opening, and the locking screw portion is engaged with the locked screw portion. When the upper lid is attached to the main body and closed by stopping, the skirt portion of the upper lid is attached to the outer side of the main body. So as to cover the outer peripheral surface of the axial length is defined, upper lid is mounted is stoppered the container opening in the closed state is mounted to the body, when said mounting, the outer mounting wall The outer mounting wall so as to restrain the outer peripheral surface of the outer mounting wall when the locking projection formed on the inner peripheral surface of the container climbs over the locking jaw formed on the outer peripheral surface of the container opening. The axial length of the skirt portion of the upper lid covering the outer peripheral surface of the upper lid is defined.
A synthetic resin cap is provided.
[0009]
The synthetic resin cap according to the present invention is mounted by being plugged into the opening of the container in which the contents are stored with the upper lid closed with respect to the main body. When punching, that is, when the locking ridge of the outer mounting wall gets over the locking jaw of the container opening, the outer diameter of the outer mounting wall is instantaneously enlarged. Since it is restrained and excessive enlargement is prevented and it is immediately restored to the original outer diameter, there is no risk of breakage (when the cut formed on the outer mounting wall is a score).
[0010]
In addition, after the stoppering, the outer peripheral wall of the outer mounting wall is covered with the skirt portion of the upper lid in a state where the upper lid is closed. The holding force of the opening to the locking jaw is sufficiently maintained. As a result, the cap is securely attached to the container opening to maintain the hermeticity and does not easily come off.
[0011]
On the other hand, when separating and collecting, the upper lid is rotated with respect to the main body, the locked screw part of the upper lid is released from the main body by releasing the lock on the main body, and the skirt part of the upper lid is attached outside. Let it open from the position covering the outer peripheral surface of the wall. Next, the outer mounting wall can be easily detached from the container opening by forcibly moving the lower end of the outer mounting wall of the main body in the axial direction away from the container opening by the fingertip. Accordingly, the entire cap can be easily detached from the container opening.
[0012]
The synthetic resin cap according to the present invention is also composed of two parts, a main body and an upper lid, so that it can be manufactured at a lower cost than those composed of the three parts as described above, and the assembly man-hours and the separation man-hours. Thus reducing assembly time and disengagement time. Since this type of cap is mass-produced, even if the cost per unit is reduced and the assembly time is slightly reduced, the overall productivity will be greatly improved, and the effect will be great. is there.
[0013]
In the present invention, the outer lid is plugged into the opening of the container that is manufactured to have an outer diameter that has the maximum plus tolerance that allows the locking jaw to be closed with the upper lid closed. Even when the outer diameter of the outer peripheral surface of the wall is substantially maximized, the outer diameter of the outer peripheral surface of the outer mounting wall is substantially equal to the inner diameter of the inner peripheral surface of the skirt portion. It is preferable that a gap is provided in advance between the inner peripheral surface of the skirt portion and the outer peripheral surface of the outer mounting wall so as not to exceed the top.
[0014]
According to the synthetic resin cap of the present invention, even when the outer diameter of the locking jaw is plugged into the container opening manufactured to the maximum allowable size, the outer peripheral surface of the outer mounting wall is the skirt portion. Since it is reliably prevented that the inner peripheral surface is pressed outward in the radial direction to increase the resistance when the upper lid is opened and closed, the upper lid is opened and closed with respect to the main body smoothly as desired.
[0015]
In the present invention, when the clearance between the inner peripheral surface of the skirt portion and the outer peripheral surface of the outer mounting wall is S, and the tolerance of the outer diameter of the locking jaw portion of the container opening is Z. The relationship between S and Z is
S ≧ 1 / 2Z
It is preferable that it is prescribed | regulated.
[0016]
According to the synthetic resin cap of the present invention, the above-described effect is more specifically achieved. However, it is assumed that the outer mounting wall of the main body and the skirt portion of the upper lid are manufactured with predetermined dimensions without error.
[0017]
In the present invention, it is preferable that a flange portion projecting outward in the radial direction is formed in at least a part of the peripheral region of the lower end portion of the outer mounting wall.
[0018]
According to the synthetic resin cap of the present invention, when separating and collecting, as described above, when the lower end of the outer mounting wall is forcibly moved in the axial direction away from the container opening by the fingertip, the flange portion is used as a hooking portion of the fingertip. It is possible to make it easier to detach from the container opening. This invention is particularly useful when an overhang ring (transfer ring) is formed on the outer peripheral surface of the container opening.
[0019]
In the present invention, it is preferable that the outer mounting wall is formed with notches extending from the lower end to the upper half part at intervals in the circumferential direction.
[0020]
In the synthetic resin cap according to the present invention, the outer mounting wall can be more easily detached from the container opening at the time of separate collection. Therefore, the entire cap can be easily detached from the container opening.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of a synthetic resin cap constructed according to the present invention will be described below in more detail with reference to the accompanying drawings. Referring to FIG. 1, the synthetic resin cap generally indicated by numeral 2 includes a main body 4 and an upper lid 6 that is detachably attached to the main body 4. The body 4, which can be integrally molded from a suitable synthetic resin such as polypropylene or polyethylene, has a top wall 8 that extends substantially horizontally. A breakable score 10 is formed on the top wall 8. The score 10 is formed in a loop shape having an appropriate shape when viewed from the axial direction (vertical direction in FIG. 1), and constitutes a scheduled opening portion 12. A pull ring 14 for opening extending upward is formed in the planned opening portion 12. The top wall 8 further includes an annular discharge guide wall 16 extending upward from the periphery of the planned opening portion 12, a cylindrical portion 18 extending upward from the periphery of the discharge guide wall 16, and an annular discharge extending downward from the periphery of the top wall 8. In the outer mounting wall 20 and the top wall 8, an annular inner mounting wall 22 extending downward from the inner side of the outer mounting wall 20 is formed. A locking screw portion (male screw portion) 24 is formed on the outer peripheral surface of the cylindrical portion 18. An annular gap is formed between the outer mounting wall 20 and the inner mounting wall 22.
[0022]
A locking protrusion 26 is formed on the inner peripheral surface of the outer mounting wall 20 over the entire periphery. The outer mounting wall 20 is formed with incisions 28 extending from the lower end thereof to the upper half including the locking protrusion 26 at intervals in the circumferential direction. In this embodiment, the incision 28 is composed of a slit that is completely broken in the radial direction, but of course, it may be a score that is partially broken in the radial direction. In addition, since the outer mounting wall 20 is thinner than a normal cap, even after the slit or score is not formed, it is easier to remove after use (at the time of separate collection) than the conventional cap. Needless to say. Furthermore, instead of forming slits and scores, there may be an embodiment in which one or a plurality of thin portions extending relatively widely in the circumferential direction are formed at intervals in the circumferential direction. A flange portion 30 is formed at the lower end portion of the outer mounting wall 20 so as to protrude substantially horizontally outward in the radial direction.
[0023]
The upper lid 6 that can be integrally formed from an appropriate synthetic resin such as polypropylene or polyethylene includes a top wall portion 40 that extends substantially horizontally. The top wall portion 40 is formed with a skirt portion 42 that extends downward from the periphery thereof, a cylindrical portion 44 that extends downward from the inside of the skirt portion 42, and a cylindrical sealing wall 45 that extends downward from the inside of the cylindrical portion 44. . A locked screw portion (female screw portion) 46 is formed on the inner peripheral surface of the cylindrical portion 44. Of course, there may be an embodiment in which the threaded screw portion 46 is formed on the inner peripheral surface of the skirt portion 42. In this embodiment, the configuration is such that the cylindrical portion 44 and the skirt portion 42 of FIG. 1 are integrally formed. As shown in FIG. 1, the upper lid 6 is attached to the main body 4 by locking the locked screw portion 46 of the upper lid 6 to the locking screw portion 24 of the main body 4. Closed. In this closed state, the axial length of the skirt portion 42 of the upper lid 6 is defined so as to cover the outer peripheral surface of the outer mounting wall 20 of the main body 4. The lower end surface of the skirt portion 42 is positioned so as to face the upper surface of the flange portion 30 of the outer mounting wall 20 with a slight clearance or in a substantially contacted state. The outer peripheral surface of the seal wall 45 of the upper lid 6 is detachably adhered to the inner peripheral surface of the upper end of the discharge guide wall 16 of the main body 4. The lower end surface of the cylindrical portion 44 is positioned so as to face the upper surface of the peripheral portion of the top wall 8 with a slight gap or in a substantially contacted state.
[0024]
A container 50 formed of an appropriate synthetic resin such as polyethylene terephthalate or glass has a container opening 52. A locking jaw 54 is formed on the outer peripheral surface of the container opening 52. The cap 2 is mounted by plugging the container opening 52 after the contents such as the liquid are accommodated in the container 50. By the stopper of the cap 2, the outer peripheral surface of the inner mounting wall 22 is press-fitted into the inner peripheral surface of the container opening 52, and the locking protrusion 26 of the outer mounting wall 20 is formed on the outer peripheral surface of the container opening 52. It is positioned at a position over the stop jaw 54.
[0025]
When the locking ridge 26 of the outer mounting wall 20 gets over the locking jaw 54 of the container opening 52, the outer diameter of the outer mounting wall 20 is instantaneously enlarged, but the skirt portion 42 of the upper lid 6 covering the outer peripheral surface thereof. Therefore, excessive expansion is prevented and the original outer diameter is immediately restored, so that there is no possibility of breakage (when the cut 28 formed in the outer mounting wall 20 is a score).
[0026]
After the cap 2 is struck, the outer peripheral surface of the outer mounting wall 20 is covered with the skirt portion 42 of the upper lid 6 with the upper lid 6 closed, so that expansion of the outer mounting wall 20 outward in the radial direction is restricted. The holding force of the locking ridge 26 with respect to the locking jaw 54 of the container opening 52 is sufficiently maintained.
[0027]
When separating and collecting the cap 2, the upper lid 6 is rotated with respect to the main body 4, and the locked screw portion 46 of the upper lid 6 is released from the main body 4 by releasing the locking of the locking screw portion 24 of the main body 4. Then, the skirt portion 42 of the upper lid 6 is opened from the position covering the outer peripheral surface of the outer mounting wall 20. Next, the lower end of the outer mounting wall 20 of the main body 4, that is, the flange portion 30 is forcibly moved in the axial direction (upward in FIG. 1) away from the container opening 52 by the fingertip, whereby the outer mounting wall 20 and thus the cap 2. Is easily detached from the container opening 52. The flange part 30 can be used as a hook part of a fingertip, and can be further easily detached from the container opening part 52. This configuration is particularly useful when a not-shown overhang ring (transfer ring) is formed on the outer peripheral surface of the container opening 52. In addition, if this flange part 30 is formed in the at least one part surrounding area of the lower end part of the outer side mounting wall 20, the said function can be achieved. Of course, there may be an embodiment in which the flange portion 30 is not formed.
[0028]
In the cap 2, the container opening manufactured in the outer diameter D having the maximum plus tolerance (+ Zmax when the tolerance is Z) in which the locking jaw 54 is allowed with the upper lid 6 closed. 52, the outer diameter of the outer peripheral surface of the outer mounting wall 20 is substantially maximized, so that the outer diameter of the outer peripheral surface of the outer mounting wall 20 is equal to the inner diameter of the skirt portion 42. A gap S is provided in advance between the inner peripheral surface of the skirt portion 42 and the outer peripheral surface of the outer mounting wall 20 so as not to substantially exceed the inner diameter dimension of the peripheral surface. Therefore, even when the outer diameter D of the locking jaw 54 is plugged into the container opening 52 manufactured to the maximum allowable size, the outer peripheral surface of the outer mounting wall 20 is the inner peripheral surface of the skirt portion 42. It is reliably prevented that the resistance at the time of opening / closing (rotating operation) of the upper lid 6 is increased by pressing outward in the radial direction.
[0029]
The relationship between the clearance S between the inner peripheral surface of the skirt portion 42 and the outer peripheral surface of the outer mounting wall 20 and the tolerance Z of the outer diameter D of the locking jaw portion 54 is defined as S ≧ 1 / 2Z. It is preferable. The tolerance Z is a diameter tolerance, and the gap S is a gap on one side in the radial direction. In this configuration, it is assumed that the outer mounting wall 20 of the main body 4 and the skirt portion 42 of the upper lid 6 are manufactured with predetermined dimensions without error.
[0030]
The preferred embodiments of the synthetic resin cap constructed according to the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments and departs from the scope of the present invention. Various modifications or corrections are possible.
[0031]
【The invention's effect】
The cap made of synthetic resin according to the present invention is not attached to the opening of the container with sufficient reliability when the container containing the contents is used, and is easily detached from the opening of the container at the time of separate collection. And can be manufactured at a relatively low cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a synthetic resin cap constructed in accordance with the present invention, and shows a state where the cap is attached to a container opening.
[Explanation of symbols]
2 Synthetic resin cap 4 Main body 6 Top lid 8 Top wall 12 Opening scheduled portion 16 Discharge guide wall 18 Cylindrical portion 20 Outer mounting wall 24 Locking screw portion 26 Locking protrusion 28 Notch 30 Flange portion 40 Top wall portion 42 Skirt portion 44 Cylindrical portion 46 Locked screw portion 50 Container 52 Container opening 54 Locking jaw portion S Clearance D between inner peripheral surface of skirt portion and outer peripheral surface of outer mounting wall Tolerance of outer diameter ZD of locking jaw portion

Claims (5)

A main body, and an upper lid that is detachably attached to the main body. The main body includes a top wall, an annular outer mounting wall that extends downward from the periphery of the top wall, and a scheduled opening portion formed on the top wall. The top surface wall includes an annular discharge guide wall extending upward from the periphery of the planned opening portion, and a locking screw portion formed in a cylindrical portion provided outside the discharge guide wall. A wall portion, a skirt portion extending downward from the periphery of the top wall portion, and a locked screw portion to be locked to the locking screw portion, and an outer periphery of the container opening on the inner peripheral surface of the outer mounting wall A locking ridge that is locked to a locking jaw portion formed on the surface is formed, and the upper lid is mounted and closed to the main body by locking the locking screw portion to the locked screw portion. In this state, the axial length of the skirt portion of the upper lid is defined so as to cover the outer peripheral surface of the outer mounting wall of the main body. Is, upper lid is mounted is stoppered the container opening in the closed state is mounted to the body, when said mounting, the locking projection formed on the inner peripheral surface of the outer mounting wall said The axial direction of the skirt portion of the upper lid covering the outer peripheral surface of the outer mounting wall so as to constrain the outer peripheral surface of the outer mounting wall when the locking jaw formed on the outer peripheral surface of the container opening is overcome Length is specified,
A synthetic resin cap. The outer peripheral surface of the outer mounting wall is closed when the upper lid is closed and the locking jaw is plugged into the container opening made to have an outer diameter having the maximum allowable tolerance. The outer diameter dimension of the outer peripheral surface of the outer mounting wall does not substantially exceed the inner diameter dimension of the inner peripheral surface of the skirt portion even if the outer diameter dimension of the outer mounting wall is substantially maximized. The synthetic resin cap according to claim 1, wherein a gap is provided in advance between the inner peripheral surface of the skirt portion and the outer peripheral surface of the outer mounting wall. If the clearance between the inner peripheral surface of the skirt and the outer peripheral surface of the outer mounting wall is S, and the tolerance of the outer diameter of the locking jaw of the container opening is Z, S and Z The synthetic resin cap according to claim 2, wherein the relationship is defined as S ≧ 1 / 2Z. The synthetic resin cap according to any one of claims 1 to 3, wherein a flange portion projecting radially outward is formed in at least a part of a peripheral region of a lower end portion of the outer mounting wall. . The synthetic resin cap according to any one of claims 1 to 4, wherein a cut extending from the lower end to the upper half of the outer mounting wall is formed at intervals in the circumferential direction.

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