DE2447011C3 - Deformable plastic lid - Google Patents

Description

20th

The invention relates to a deformable plastic cover with a wave-shaped in the circumferential direction formed cover mirror, in which the «crests of the wave-shaped folds are straight from a central cover mirror part in the radial direction to one which can be inserted into a container mouth Extend circumferential wall of the cover, on the outside of this circumferential wall integrally a protruding, closed circumferential sealing bead is formed.

Such a deformable plastic cover is described in US Pat. No. 3,679,088. It is characterized in particular by the fact that when pressure ^{J5 is} exerted on the central cover surface part, the peripheral wall of the cover contracts, thereby allowing the cover to be easily and tightly placed on the container mouth. When the pressure drops, the lid expands in the radial direction and thus sits tightly on the container mouth. The lid is lifted off accordingly.

In the case of this known plastic cover, the seal is made by the circumferential sealing bead. Experience has shown, however, that these measures are not sufficient for a completely satisfactory seal always sufficient.

The German utility model 18 51 125 describes a plastic lid, in which on a peripheral wall of the lid at a distance from one another two outwardly facing sealing beads are provided, which seal against a wall of a container mouth invest. These measures, too, are sufficient for complete sealing, in particular of micropores or micro-openings, not off.

The German utility model 18 08 216 describes a crown closure made of plastic for bottles or similar containers, with an inner ring formed on the bottom of the cap, which carries two outwardly pointing and spaced apart sealing beads, both of which are directed downwards at an angle to the horizontal are. Both sealing beads are therefore relatively flexible, which is also not sufficient for a good sealing effect. ^b

Based on a deformable plastic cover of the type mentioned, the invention is the The object is to develop this so that its sealing effect on a container mouth attached plastic lid is improved.

To solve this problem, the invention is characterized in that on the peripheral wall at a distance a second, thinner and consequently more flexible than the first bead is held above the sealing bead and arranged at an angle to the horizontal downwardly directed sealing bead isL

A very good sealing effect is achieved through these measures, because the lower sealing bead has a larger sealing surface than the »" upper bead, due to the leaks that may occur during the aforementioned deformation of the plastic cover its flexible properties. This is further supported by the fact that the upper sealing bead is directed downwards at an angle to the horizontal and is therefore lip-like on the wall of the Can create container mouth.

The invention with its various features and advantages is shown below with reference to the drawing for example explained in more detail, namely shows

F i g. 1 is a plan view of a cover;

F i g. 2 is a view of the lid of FIG. 1 from below;

3 shows a cross section along the line 3-3 of FIG.

FIG. 4 enlarges a partial section through the cover mirror along the line 4-4 in FIG. 1;

FIG. 5 enlarges a partial section of the cover area of FIG. 5 delimited by the line 5-5. 3;

F i g. 6 enlarges a partial section of the through the line 6-6 of FIG. 3 limited lid area;

F i g. 7 enlarges a partial section along the line 7-7 of FIG. 5; and

F i g. 8 enlarges a partial section through the through the line 8-8 of FIG. 2 limited lid area.

From Fig. I and 2 results in the overall design of a plastic cover 10, essentially three contains functional parts, namely a circumferential groove 12 in the form of an inverted U-shape, a wave-shaped Cover surface 14 containing folds 16 and a central, essentially flat cover surface part 18 inside the cover area 14. The folds 16 start from the central cover area part 18 and end on the inner circumferential wall 20. This forms part of the circumferential groove 12, namely that part of the Circumferential groove that forms the seal between the lid 10 and an associated (not shown) container causes.

The circumferential groove is formed by an outer wall 22 and a substantially horizontal, connecting upper wall 24 completed. The outer surface 26 of the peripheral wall 20 is used to engage with the inner Wall of the opening of the container, not shown. This intervention creates the aforementioned hermetic one Sealing and thus leads to a container closure, such as is used in particular for storing food is extremely desirable. The outer wall 22 and the top wall 24 serve to the lid in the to be fixed in the correct position on the container.

The structural design of the cover surface 14 is essentially the same as that according to the US-PS 36 79 088 match. When pressure is applied to the cover surface part 18, the folds 16 lie against one another and thereby displace the inner peripheral wall 20 inward. Further, the diameter is at least one Part of the inner peripheral wall 20 larger than that of the associated container, so that when the pressure drops sealing system takes place. As a result of the folding would

the cover mirror 14 further fold up like an umbrella when the peripheral wall 20 and the peripheral groove 12 would not exert their stabilizing and stiffening effect. The resilient return of the Lid to approximately its original molded shape after it has been contracted is through the Perimeter wall 20 supports.

As can be seen in particular from FIGS. 3, 5 and 6 is clear, the inner peripheral wall 20 has a outwardly projecting sealing bead 28, which is on the circumference of the outer surface 26 of the peripheral wall 20 extends When the lid 10 in larger Dimensions (with a diameter of about 25 cm and more), the bead 28 has the Tendency to deform a little. This deformation can be seen as the result of a different contraction of the cover surface 14 explain. The consequence of such a deformation is the formation of microscopic ones openings between the wall of the container and the sealing bead

To address this difficulty, the invention provides a second sealing bead 30 above of the bead 28 in front. This second bead is also formed in one piece on the peripheral wall 20.

It is preferably located in a region of the peripheral wall 20 where the deformation is at a minimum In the same way, the bead 28 is also slightly in another embodiment above the uppermost point of the line of intersection between the cover surface 14 and the peripheral wall 20 intended. Therefore, in such an embodiment, both beads 28 and 30 are one corresponding less exposure to the contraction of the peripheral wall 20.

F i g. 5 and 6 leave the relationship of the two beads JS Identify 28 and 30 better. These two beads form separate continuous rings around the outer surface 26 the circumferential wall 20. As can be seen further, these two rings lie within the one through the other Walls 22 and 24 of the U-shaped groove formed boundaries. Further goes from the drawing clearly shows that the bead 28 is designed for a relatively large sealing surface, while the bead 30 as complementary element is shaped of greater flexibility. It should be noted in particular that the bead 30 is a has a finger-like profile and is directed at an angle of about 45 ° downwards into the U-shaped groove. When the lid 10 is attached to a container, a finger-like bead 30 is produced Bending moment which forces the bead into sealing engagement with the inner wall of the container. Come in addition, that the lower bead 28 keeps significant hydrostatic pressure from the bead 30, so that even at Presence of microscopic openings along both sealing areas the pressure is not sufficient to Forcing liquid through.

Another feature !, that of the cover versions of this type is shown in FIG. 2, 5, 7 and 8 shown. Here ribs 32 extend from the Circumferential wall 20 from along the bottom of the top wall 24 and then down along the Inside of the outer wall 22. These ribs are spaced around the groove 12 around so that from the Container when the lid 10 is applied, air can easily escape. It should be noted that the Extending the ribs 32 downwardly along the outer wall 22 forms a seal between that wall and the container is prevented while the lid is being applied. This allows out of the container relatively much air are displaced, which is also advantageous for the seal.

For this purpose 3 sheets of drawings

Claims (1)

1
Claim: Deformable plastic cover with a cover mirror that is wave-shaped in the circumferential direction, in which the crests of the undulating folds straight from a central cover mirror part in the radial direction to a peripheral wall of the which can be inserted into a container mouth Cover extend, wherein on the outside of this peripheral wall integrally a protruding, closed circumferential sealing bead is formed, characterized in that on the Circumferential wall (20) at a distance above the sealing bead (28) a second, thinner and consequently more flexible than the first bead held 'and at an angle to the horizontal is arranged downwardly directed sealing bead (30)