JPS5940704B2 - container lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a container lid made of a resiliently deformable plastic material with an inwardly extending annular snap rib that engages a peripheral flange of the container to be sealed. Regarding.

For example, the types of lids used as sealing lids for containers, such as paint containers, often create severe stresses in the material of the container lid and are difficult to remove due to the effective seal.

It is an object of the invention to facilitate the removal of a sealed container lid from a container, in that the lid flange adjacent the snap rib is connected to a peripheral release flange forming a bistable snap cap. The release flange is achieved by the snap rib being disengaged from or reduced to the container flange from a downwardly extending position where it abuts the container flange under tension. It can be bent to the release position located above where it abuts under the applied tension.

The lid flange and the release flange constitute the link of a bistable toggle joint, the part between these flanges constitutes the hinge, and the tension acting on the annularity of the release flange is in some positions the snap rib and the container flange are held firmly together, and in other positions the snap rib is disengaged from or only slightly in contact with the container flange. Acts as a spring to assist in retention.

By moving his finger along the underside of the release flange, the person handling the container can easily bend the release flange to a bent position, at which point the annular tension is at its maximum. This allows the release flange to be flipped up to its release position. In the unlocked position, the lid can be easily removed and can be left loosely fitted to the container to temporarily protect its contents while the container is in use. The container lid according to the invention is characterized in that the inner wall of the lid flange is provided with an annular recess, which recess is conical towards the thin bendable portion of the lid flange directly above the snap rib. It is expanding downward.

This container lid is particularly suitable for axially tensioned lids, in which the underside of the lid firmly abuts the container opening edge along a narrow sealing line, and the lid flange rests against the container opening edge. It is located radially outward and bends sharply to integrate with the lid surface itself without the risk of transmitting bending moments. The lid is such that the distance between the edge of the container opening and the underside of the container flange is between the sealing line of the lid and the top side of the snap rib on said lid flange of the removed lid. Since the distance is greater than the vertical distance, tension is applied in the axial direction. Placement of this lid on the container creates a strong axial tension in the lid flange, which increases the greater the required pressure per unit area at the sealing line between the opening of the container and the lid. Become. Because the lid flange is tensioned only in the axial direction, and therefore receives only a tensile force, the joint between the lid flange and the release flange may have a relatively thin wall thickness, which allows the release flange to be In order to bend from one position to another, it is actually only necessary to overcome the maximum tension on the circumference of the release flange. If the container lid is sealed only by axial tension, it does not matter whether the annular tension is greater in the sealing position or in the released position of the release flange.

The release flange may be configured to extend substantially vertically downwardly along the container wall to avoid problems when multiple containers are placed adjacent to each other. The invention will be explained in more detail below with reference to the drawings.

The container lid shown in FIGS. 1 to 3 has a flat surface 1 and a radial flange portion 4 which joins said flat surface 1 via a substantially axial inner flange portion 5 with a circular or radial shape. Via the edge 3 it has a merging, substantially axial, lid flange 2 which in use extends downwardly.

The underside of this radial flange 4 is provided with an axial guide rib 6 and a sharp sealing rib 7 which abuts the edge of the opening of the container along a narrow sealing line. When the container is tightly sealed, the snap rib 8 on the inside of the lid flange 2 abuts a fixed edge at the end of the container flange 9 extending from the wall 10 of the container. FIG. 3 shows by dotted lines the position of the conical edge 3 when the lid is loosely placed on the container. In this position, the vertical distance from the opening edge of the container to the fixed edge extending below the container flange 9 is less than the vertical distance from the sealing rib 7 to the top of the snap rib 8. It's also big. When the lid is firmly seated on the container, the conical edge 3 is pressed down by an axial force, as shown in solid lines, so that the snap rib 8 engages the fixed edge of the flange 9 of the container. match. The lid flange 2 is therefore subjected to an axial tensile force, which forces the sealing rib 7 against the container opening. Snap・
Immediately above the rib 8, the lid flange 2 is provided with an annular recess 11, and a release flange 1 extends downward through the thin wall portion 12 at the fishing stop position as shown in the figure.
Combines with 3.

When the user of the container wishes to open the lid, he moves his finger along the underside of the sealing flange 13 to exert increasing pressure outwards, thereby increasing the annular tension to a maximum. as a result of which the flange suddenly springs up towards its upper position, shown in dotted lines in the figure, where the snap rib 8. comes off from the container flange 9. Release flange 1
3 is thus hinged to the lid flange 2 and acts as a bistable toggle joint by means of the thin flanks 12. If the release flange 13 is shaped to extend radially outwardly from the container wall in the sealing position, the annular tension increases and creates a tight inter-engagement between the snap rib 8 and the container flange 9. It turns out. The container lid according to the invention with the release flange of the bistable snap catch may have a different shape from the embodiment shown in the figures.

In particular, the periphery of the lid may be in the shape of a regular polygon with rounded corners to accommodate corresponding polygonal containers such as food storage containers, lunch boxes, food buckets, etc.

[Brief explanation of the drawing]

FIG. 1 is a radial sectional view showing one embodiment of the container lid according to the present invention, FIG. 2 is a plan view showing the same lid, and FIG. 3 is a sectional view showing a preferred embodiment of the container lid according to the present invention. be. 1... Flat surface, 2... Lid flange, 3.
...Edge, 4...Radial flange, 5
...Axial inner flange portion, 6...Axial guide rib, 7...Sealing rib, 9...
・Container flange, 11... Annular recess, 13・
...Release flange.

Claims (1)

Claims: 1. A resiliently deformable plastic material having a downwardly extending lid flange 2 provided with an inner annular snap rib 8 that engages a peripheral flange 9 of the container to be closed. container lid made of aluminum, the lid flange 2 adjacent the snap rib 8 joining an annular release flange 13 forming a bistable snap catch, the release flange 13 being adjacent to the snap rib 8. from a downwardly extending position in which the snap ribs are capable of abutting against the container flange 9 under tension conditions, said snap ribs either disengage from the container flange or extend upwardly into abutment with the container flange under slight tension. (a) the lid flange 2 is located outwardly at a radial distance from the mouth of the container;
and (b) is sharply bent to merge with the conical edge 3 of the lid, and (c) when the release flange 13 is in the downwardly extended position and the lid is unstressed, the opening of the container the vertical distance between the edge and the lower edge of the container flange 9 is greater than the vertical distance between the lid sealing line 7 and the top surface of the snap rib 8; and (d) the inside of the lid flange 2. An annular recess 11 is provided in the wall surface, and the annular recess 11 is connected to the snap rib 8.
A container lid, characterized in that it flares downward in a conical manner to a thin elastic portion 12 of the lid flange directly above the container lid. 2. The container lid of claim 1, wherein the release flange 13 is shaped to extend substantially axially when in the sealing position.