JPH0446823B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a plastic container having a lid having a closing element that grips and engages around the upper end of the container wall and a circumferential groove (annular groove) connected to the closing element. This invention relates to a container closure device.

PRIOR ART AND PROBLEM TO BE SOLVED BY THE INVENTION A closure device of this type for plastic containers with polygonal flanges is disclosed in German patent no.
55-016899)). Containers of this type are particularly suitable for rail or truck transport, where side impacts may frequently occur. However, no special structure (i.e., locking structure) is provided to prevent removal (or detachment) of the lid.

The container lid disclosed in Japanese Unexamined Utility Model Publication No. 56-49753 is equipped with an opening history display band that allows confirmation of whether the lid has been opened in the past. The indicator band itself is not intended to prevent the lid from being removed from the container. The container lid consists of a disc-shaped metal cover and a plastic ring having a cylindrical skirt, but the metal cover and plastic ring are not molded as a single piece; After manufacturing each member individually, they are formed by combining them. This structure, which cannot be integrally molded, is disadvantageous from the viewpoint of keeping the manufacturing cost of the container low. In addition, the band for the container lid shown in the publication is not intended to resist external force to prevent the lid from coming off the container due to its function as an interference indicating band, but rather to prevent the lid from coming off during transportation. No structure is provided to prevent this by the engagement relationship between the container and the container.

The present invention was devised against this technical background, and is capable of preventing the lid from coming off during transportation due to the reliable engagement relationship between the closure band and the container. As stated in the introduction, the lid and container can be manufactured efficiently and economically by die-casting, and the lid can be easily removed by tearing off the locking band. The aim is to improve closure devices.

Means and operation for achieving the object The object is a closure device for a plastic container with a lid, the plastic container being a shaped body which is open at its upper end and has a peripheral wall and a bottom wall; On the outside, the lid has a plurality of retaining protrusions spaced apart from one another in the circumferential direction, a closure element surrounding and engaging the upper circumferential wall of the container, and a closure element adjoining the closure element. A structure that has a circumferential groove and a closure band, and the outer wall of the closure element has a plurality of openings corresponding to the retention protrusions, and the lid is closed by the engagement relationship between the closure band and the retention protrusions. In the closure device of
The upper circumferential wall of the container has a thickened portion at its upper end, the lid has a tightening circumferential rib that engages the back of the thickened portion, and the closure band is a tear-off band integrally formed with the lid. This is achieved by providing a plastic container closure device in which the closure band has a plurality of locating grooves located below the opening and aligned with the container retaining projections.

In such a configuration, when the lid is attached to the container for the first time, the lid is first applied to the upper end of the peripheral wall of the container. In this operation, it is not necessarily necessary to position the lid in the circumferential direction. This is because when the lid placed on the container is slid and rotated in the circumferential direction, each holding protrusion engages with the positioning groove, thereby correctly positioning the lid with respect to the container. When the lid is then pressed downwards, i.e. towards the bottom wall of the container, the relative displacement between the retaining projection of the container and the lid causes the retaining projection to enter into the opening of the closure element above the positioning groove and to The retaining projection engages the closure band, thereby closing the container with the lid.
At this time, the tightening circumferential rib of the lid engages with the thick portion at the upper end of the container peripheral wall.

To remove the attached lid from the container, the closure band, which is a tear-off band, is first torn off. By breaking the closure band, the engagement between the retaining projection and the closure band is released, and the lid can be removed from the container. Next, when the lid is moved in a direction away from the container, the tightening circumferential rib of the lid disengages from the thick portion at the upper end of the peripheral wall of the container, and the lid is removed. After the closure band is broken, the lid can be reattached by utilizing the engagement relationship between the tightening circumferential rib of the lid and the thick portion at the upper end of the container peripheral wall. This is the same as installing a regular snap-on lid.

Embodiments Next, embodiments of the present invention will be described in more detail based on figures.

Referring to FIGS. 1 and 3, a lid 1 with a closure element 21 has an outer wall 3 that grips around the upper peripheral wall of the container, and a circumferential groove 4 connected to the outer wall. It can be seen that it has two walls 5 and 6 that are similar to each other. The wall 6 has a continuous bulge 7 which serves for reinforcement. A plurality of reinforcing ribs 8 are attached to the circumferential groove 4. FIG. 1 shows, with reference also to FIG. 2, an opening 9 in which a plurality of corresponding retaining projections 17 are intended to grip the lid, and on both sides of a first weakened point 22 of the tear-off band 11, which is a closure band. Two pull-out rings 10a and one pull-out ring 10b are shown. On the other side of both tear-off rings 10a, a second weakened point 22a is provided in the tear-off band in order to completely separate the parts with both rings 10a. FIG. 2 also shows perforations 12 between the lid and the tear-off band 11.

The container 2 is open at the top, has a peripheral wall and a bottom wall, and has a polygonal flange 13 with a group of ribs 14 serving as grooves at the top end. An upper circumferential wall 15 of the container wall extends above the flange, and the upper circumferential wall is provided with a thick wall portion 24, a plurality of circumferential reinforcing ribs 16, and a plurality of circumferential reinforcing ribs 16 spaced apart from each other in the circumferential direction. It has a holding protrusion 17 of. As can be seen from Figure 3,
The holding protrusion and the tear-off band are configured such that in the closed state, the holding protrusion presses against the tear-off band and tightens the lid. Thick wall portion 24 of the upper circumferential wall of the container and outer wall 3 of the lid gripping around the circumferential wall of the container
There is a packing (sealing ring) 18 between the two. Between the rings 10a and 10b of the tear-off band there is a weakened point 22 so that the band can be opened and pulled apart without the use of tools, thereby allowing the lid to be removed. Furthermore, as can be seen in FIG. 3, there is a positioning groove 19 aligned below each opening 9, which groove 19 can be engaged with the retaining projection 17 when installing the lid, and then the lid can be pressed downward. .

To enable re-closing of the lid, the outer wall 3 of the lid
There is a tightening circumferential rib 23 that grips the thick wall portion 24 of the upper peripheral wall of the container with its back (lower surface in the figure). Opening 9
is opened downward when the tear-off band is pulled apart, so that the outer wall 3 of the lid becomes elastic.

Furthermore, it is also possible to provide a drainage hole in the lid, for example a removable telescoping member made of metal or soft plastic. Each reinforcing rib 8 can be provided with one central step 20, into which the bottoms of the upper containers can be neatly stacked on top of the lower containers when the bottoms of the containers are stacked. obtain. It will be further understood from the above description that both the lid and the container can be manufactured as integral parts by die casting.

Effects of the Invention According to the present invention clarified in the above explanation,
The following advantages are obtained:

The relationship in which the retaining projection of the container engages with the closure band as a tear-off band in connection with the opening of the closure element ensures a reliable closure of the container and only allows removal of the lid by breaking the closure band. This prevents the lid from coming off due to impact from external forces applied to the container when the container is being transported. Even if the engagement between the holding protrusion and the closure band is made strong enough, the closure band can be broken to remove the lid from the container, so there is no problem in removing the lid.

The tightening circumferential rib provided on the lid engages with the back of the thick wall at the top of the upper peripheral wall of the container, so that even after the closure band is removed, it can be attached to and removed from the container. Moreover, the lid can be attached securely.

The lid has a positioning groove formed below the opening, which makes it easy to correctly position the lid when applying it to the container. The lid can be installed automatically.

Since the lid, including the closure band, is molded as a single piece, the cost of manufacturing the lid can be reduced.

[Brief explanation of the drawing]

1 is a plan view of a lid according to the invention, FIG. 2 is a side view of a closure device according to the invention, FIG. 3 is a sectional view of a closure device according to the invention, and FIG. 4 is a closure according to the invention. FIG. 3 is another cross-sectional view of the device. DESCRIPTION OF SYMBOLS 1... Lid, 2... Container, 3... Outer wall of closing element, 4... Circumferential groove, 5... Wall of lid, 7... Swelling part, 8... Reinforcement rib, 9... Opening, 10a, 10
b... Pull-out ring, 11... Closure band (tear-off band), 12... Perforation, 13... Polygonal flange, 14... Rib, 15... Container upper peripheral wall,
16... Circulating reinforcing rib, 17... Retaining protrusion, 18
. . . Sealing ring, 19 . . . Circumferential groove, 20 .

Claims (1)

[Scope of Claims] 1. A closing device for a plastic container 2 having a lid 1, wherein the plastic container 2 is a shaped body with an open top end and a peripheral wall and a bottom wall. The lid 1 comprises a plurality of retaining projections 17 spaced apart from each other in the direction, the lid 1 comprising a closure element 21 surrounding and engaging the upper circumferential wall 15 of the container, and a closure element 21 adjoining the closure element. The outer wall 3 of the closure element has a circumferential groove 4 and a closure band 11, and the outer wall 3 of the closure element has a plurality of openings 9 corresponding to the retaining projections 17, so that the engagement between the closure band and the retention projections 17 is controlled. In this closure device, the upper peripheral wall 15 of the container is provided with a thickened part 24 at its upper end, and the lid 1 is provided with a tightening circumferential rib 23 that engages with the back of the thickened part, and further Plastic, characterized in that the closure band 11 is a tear-off band formed integrally with the lid and has a plurality of positioning grooves 19 located below the opening 9 and aligned with the retaining projections of the container. Container closure device. 2. Closing device for plastic containers according to claim 1, characterized in that the tear-off band has tear-off rings (10a, 10b) on both sides of one weakened point (22). 3. Closing device for plastic containers according to claim 1 or 2, characterized in that one sealing ring 18 is inserted into the lid. 4. The circumferential groove 4 is characterized in that the circumferential groove 4 is provided with a plurality of reinforcing ribs 8 having one central stepped portion 20. Closing device for plastic containers. 5. Plastic according to any one of claims 1 to 4, characterized in that the lid has a drain opening and a removable telescoping member for the drain opening. Container closure device. 6. Closing device for a plastic container according to any one of claims 1 to 5, characterized in that the upper peripheral wall 15 of the container has a plurality of circumferential reinforcing ribs 16. 7. Closing device for a plastic container according to one of the claims 1 to 6, characterized in that the container has a polygonal flange 13 with a group of ribs 14.