JPH04352647A - Container lid - Google Patents

Abstract

PURPOSE:To prevent without fail displacement of a linear from a molded groove of a body in a container lid which is provided with a synthetic resin-made body having a top wall and a cylindrical skirt wall suspending from a peripheral edge of the top wall and a synthetic resin-made and ring-shaped linear molded in a ring-shaped molded groove formed on an outer periphery of an inside of the top wall of the body. CONSTITUTION:A ring-shaped engaging groove 16 is formed in a bottom surface of a molded groove formed on an outer periphery of an inside of a top wall of a body, and a plurality if engaging projections 22 are formed with intervals in the cercumferential direction in the engaging groove 16. Further, engaging projections 22 projected slantwise toward one side in the cercumferencial direction toward below and engaging projections 22 projected slantwise toward opposite side in the circumferential direction toward below are arranged alternately.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a synthetic resin body having a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, and a synthetic resin body disposed on the inner and outer periphery of the top wall of the main body. The present invention relates to a container lid comprising an annular liner.

0002

[Prior Art] Japanese Patent Publication No. 1-34856 describes a container lid suitable for containers containing powder such as coffee powder.
A container lid is disclosed that includes a body molded from a relatively hard synthetic resin and an annular liner molded from a relatively soft synthetic resin. The main body has a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall. An annular molding groove is formed on the inner outer circumference of the top wall. A female thread is formed on the inner peripheral surface of the skirt wall, and is screwed into a male thread formed on the outer peripheral surface of the mouth and neck of the container. The annular liner is advantageously formed by a so-called spin lining process which involves pouring a molten synthetic resin material into the annular forming groove of the body.

[0003] The above-mentioned Japanese Patent Publication No. 1-34856 further discloses that in order to prevent the liner from displacing from within the forming groove of the main body, the bottom surface of the forming groove is formed on the inner and outer periphery of the top wall of the main body. It is also disclosed that a plurality of blind holes are formed at appropriate intervals in the liner, and the synthetic resin material forming the liner flows into the blind holes to form protrusions.

0004

[Problems to be Solved by the Invention] In the conventional container lid described above, a plurality of blind holes are formed in the bottom of the molding groove formed in the top wall of the main body, thereby improving the molding of the main body. Although an attempt is made to prevent displacement of the liner from within the groove, the action of preventing displacement of the liner is not necessarily sufficient. According to the experience of the inventors, when applying the required torque to the container lid and attaching it to the mouth and neck of the container, the liner is compressed between the main body of the container lid and the mouth and neck of the container. As a result, the liner may be partially displaced from within the molded groove of the main body, resulting in an insufficient seal at the neck of the container, or when the container lid is removed from the neck of the container. Due to its attachment to the neck of the container, the liner is partially displaced from within the molded groove of the main body, and thus the container lid can be reattached to the neck of the container to fully maintain the neck. It often happens that the product cannot be resealed.

The present invention has been made in view of the above facts, and its technical problem is to solve the problem of partially displacing the liner from the annular molding groove formed on the inner and outer periphery of the top wall of the main body. The purpose is to ensure that it is prevented with sufficient certainty.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned technical problems, in the present invention, an annular molded groove formed on the inner and outer periphery of the top wall of the main body is inclined downward in the circumferential direction. A plurality of locking protruding pieces are formed at intervals in the circumferential direction.

That is, according to the present invention, the synthetic resin has a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and an annular molded groove is formed on the inner and outer periphery of the top wall. In a container lid comprising a synthetic resin main body and a synthetic resin annular liner molded in the molded groove of the main body, the molded groove of the main body has a plurality of locking protrusions spaced apart in the circumferential direction. There is provided a container lid characterized in that a plurality of locking protrusions are formed and the plurality of locking protrusions protrude downwardly at an angle in the circumferential direction.

[0008] The circumferential inclination angle α of the locking protrusion is 30 to 70 degrees, and the locking protrusion protrudes downward at an inclination to one side in the circumferential direction, and the locking protrusion protrudes downward at an inclination to the opposite side in the circumferential direction. It is preferable that the locking protruding pieces protruding from each other are arranged alternately when viewed in the circumferential direction.

[0009] Furthermore, it is preferable that an annular locking groove is formed on the bottom surface of the molding groove, and that the locking protrusion is formed within the locking groove. Preferably, the radially inner surface of the locking groove is sloped downwardly and radially outward, and the radially outer surface of the locking groove is sloped downwardly and radially inwardly. , the radial inclination angle β of the radially inner surface and the radially outer surface of the locking groove is 70 to 8.
5 degrees is fine.

0010

[Operation] In the container lid of the present invention, the plurality of locking protrusions are not vertically projected in the liner molded in the molding groove, but are inclined downward in the circumferential direction, so that the locking The locking action of the protruding piece sufficiently reliably prevents the liner from being displaced from within the molding groove.

In order to form the locking protrusion in the molding groove formed on the inner and outer periphery of the top wall of the main body, it is necessary to form the locking protrusion on the inner and outer periphery of the top wall in the mold assembly for molding the main body. A plurality of required cuts (cuts corresponding to the locking protrusions) may be formed at intervals in the circumferential direction in the annular portion that defines the forming groove by normal cutting, and the locking protrusions are arranged. This does not cause any separate problems such as a significant increase in the manufacturing cost of the mold. (As with the conventional container lid mentioned above, when blind holes are formed at intervals in the circumferential direction on the bottom of the molding groove formed on the inner and outer periphery of the top wall of the main body, In the mold assembly, it is necessary to form a plurality of required protrusions at intervals in the circumferential direction on the annular part that defines the molding groove on the inner and outer periphery of the top wall, and to form such protrusions, cutting is required. Special processing such as electrical discharge machining is required instead of machining.
The manufacturing cost of the mold increases considerably. )

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the container lid improved according to the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, the improved container closure according to the present invention includes a synthetic resin body generally designated by the numeral 2. The main body 2, which can be conveniently molded by compression molding or injection molding from a relatively hard synthetic resin such as polypropylene or polyethylene, has a circular top wall 4 and a cylindrical skirt wall 6 depending from the periphery of the top wall 4. have Knurling (unevenness) 8 is formed on the outer peripheral surface of the skirt wall 6 to prevent slipping. A female thread 10 is formed at the lower part of the inner peripheral surface of the skirt wall 6. An annular molding groove 12 is formed on the outer circumference of the inner surface of the top wall 4 . The illustrated cross-sectional shape of the forming groove 12 is approximately semicircular. If desired, the cross-sectional shape of the forming groove 12 can be rectangular or any other suitable shape. Top wall 4
An annular protrusion 14 extending along the inner edge of the molding groove 12 is also formed on the inner surface of the molding groove 12 .

In the illustrated container lid improved according to the present invention, an annular locking groove 16 is formed on the bottom surface of the molding groove 12 formed on the outer circumference of the inner surface of the top wall 4 of the main body 2. . As clearly shown in FIG. 2, the cross-sectional shape of the locking groove 16 is wedge-shaped, and the radially inner surface 18 is inclined downwardly and radially outwardly at an inclination angle β. The outer surface 20 is similarly inclined downwardly and radially inward at an angle of inclination β. Considering the ease of removing the compression-molded or injection-molded main body 2 from the mold, as well as the required locking action for the liner, which will be described later, it is preferable that the angle of inclination β is about 70 to 85 degrees. The depth of the locking groove 16 may be approximately 0.4 mm. Continuing the explanation with reference to FIGS. 3 and 4 together with FIGS. 1 and 2, in the locking groove 16 there are a plurality of locking grooves, 120 in the illustrated embodiment, at intervals in the circumferential direction. A protruding piece 22 is formed. Each of these locking protrusions 22 extends radially in FIG. 3, which is a horizontal cross-sectional view. On the other hand, as understood from FIG. 4, in the vertical cross-sectional view, each of the locking protrusions 22 protrudes downward at an angle in the circumferential direction. In the illustrated embodiment, the inclination directions of the locking protrusions 22 are alternately reversed;
In FIG. 4, the locking protrusion piece 22 projects downward and tilts to the right (clockwise when viewed from above), and in FIG. The locking protruding pieces 22 are arranged alternately. Considering the ease of cutting out the main body 2 from the mold and the required locking action on the liner, which will be described later, it is preferable that the circumferential inclination angle α of the locking protrusion 22 is about 30 to 70 degrees. The thickness of the locking projection piece 22 may be approximately 0.2 mm.

A liner 24 made of synthetic resin is molded within the molding groove 12 formed on the outer circumference of the inner surface of the top wall 4 of the main body 2 . Such liner 24 can be conveniently molded by a spin lining method in which a molten synthetic resin material is poured into molding groove 12 and allowed to harden. The synthetic resin material molded into the liner 24 is preferably relatively soft, such as a vinyl chloride synthetic resin. In the illustrated container lid improved according to the present invention, a locking groove 16 is formed on the bottom surface of the mold 12 of the main body 2, and a plurality of locking grooves 16 are formed at intervals in the circumferential direction. Since the locking protrusion 22 is formed, the synthetic resin molded into the liner 24 also flows into the locking groove 16, and the locking protrusion 22 is caused to protrude into the molded liner 24. The cross-sectional shape of the locking groove 16 is wedge-shaped, and the locking protrusion 22 is inclined downward in the circumferential direction (in alternate opposite directions).
As will be readily understood by reference to FIG.

FIG. 5 shows a state in which the container lid is attached to the mouth and neck of the container. The container, which may be formed from sheet metal, such as chromated sheet steel, has a neck 26 which is open at the top. The upper edge of the mouth and neck part 26 has a so-called curl 2 formed by wrapping a thin plate inside.
8 are arranged. Further, a male thread 30 is formed on the outer peripheral surface of the mouth and neck portion 26. The container lid consisting of the main body 2 and the liner 24 is fitted onto the mouth and neck part 26 and rotated in a predetermined direction (clockwise when viewed from above), so that the female thread 10 of the main body 2 is connected to the male thread of the mouth and neck part 26. By screwing it to 30,
It is attached to the mouth and neck part 26. The liner 24 is then pressed against the upper edge or curl 28 of the mouth and neck 26, thus sealing the mouth and neck 26, as shown more clearly in FIG. To open the mouth and neck part 26, move the container in the opening direction (
All you have to do is rotate it counterclockwise (when viewed from above).

[0017]

[Effects of the Invention] In the container lid of the present invention, the locking action of the locking protrusions formed at intervals in the circumferential direction in the molding groove (preferably locking grooves formed in the molding groove) allows the locking of the main body. Displacement of the liner from the molded groove in the top wall of the is sufficiently reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a side view, partially in section, of an embodiment of a container lid improved according to the present invention.

FIG. 2 is an enlarged partial cross-sectional view of a portion of the container lid in FIG. 1;

FIG. 3 shows a part of the main body of the container lid of FIG. 1, FIG.
A horizontal cross-sectional view taken along line A-A.

4 is a vertical sectional view taken along line BB in FIG. 3, showing a portion of the container lid in FIG. 1;

FIG. 5 is a side view, partially in section, showing the container lid of FIG. 1 attached to the mouth and neck of the container.

[Explanation of symbols]

2: Main body of container lid 4: Top wall 6: Skirt wall 12: Annular molding groove 16: Annular locking groove 22: Locking protrusion piece 24: Liner 26: Mouth and neck of container

Claims (9)

[Claims] 1. A main body made of synthetic resin, comprising a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and an annular molded groove is formed on the inner and outer periphery of the top wall; In the container lid comprising a synthetic resin annular liner molded in the molded groove of the main body, a plurality of locking protrusions are formed at intervals in the circumferential direction in the molded groove of the main body, A container lid characterized in that the plurality of locking protrusions are inclined downward in the circumferential direction and protrude downward. [Claim 2] The circumferential inclination angle α of the locking protrusion is 3.
The container lid according to claim 1, wherein the temperature is 0 to 70 degrees. 3. The locking protrusion piece includes a locking protrusion piece that projects downward and inclined to one side in the circumferential direction, and a locking protrusion piece that projects downward and slopes to the opposite side in the circumferential direction. The container lid according to claim 1 or 2, wherein 4. A locking protrusion piece that projects downwardly at an inclination to one side in the circumferential direction and a locking protrusion piece that projects downwardly at an inclination to the opposite side in the circumferential direction are arranged alternately when viewed in the circumferential direction. The container lid according to claim 3, wherein the container lid is arranged. 5. A container lid according to claim 1, wherein the locking projection extends in a radial direction. 6. An annular locking groove is formed on the bottom surface of the molding groove, and the locking projection piece is formed within the locking groove. container lid. 7. A radially inner surface of the locking groove is inclined downwardly and radially outward, and a radially outer surface of the locking groove is downwardly inclined radially inwardly. , A container lid according to claim 6. 8. A radial inclination angle β of a radially inner surface and a radially outer surface of the locking groove is 70 to 85 degrees.
The container lid according to claim 7. 9. The container lid according to claim 1, wherein the liner is molded by pouring a molten synthetic resin material into the molding groove of the main body.