FI84581C - Plastic container with lid - Google Patents

Description

1 84581

The present invention relates to a plastic container with a lid comprising a container body open at one end, the open mouth 5 of which is surrounded by a rim ending in a downwardly pivoting hem, a lid for substantially closing the open end of the container body wherein the inner surface of the bead of the lid 10 has a groove widening in cross-section toward the bottom, into which a resilient seal is fitted in the form of a substantially flowable mass, and a ridge at the rim of the container body which presses against the lid seal.

A container with a lid as described above is known partly from GB application 2,021,531 and partly from CH patent 656,365. Such plastic containers are made of thermoplastics such as polyethylene or polypropylene or their copolymers and are very widely used. 20 Uses include the storage of foodstuffs, such as marmalade or mustard, or the storage of technical products, such as certain paints and adhesives.

Most plastic containers have structural features that help make the lid tight. However, most structural solutions leak either liquid or vapor, resulting in contamination of the product in the containers or loss of the amount of material itself. In order to make the container sealed, for example, the procedure has been described above or is known from the above-mentioned GB application, i.e. a resilient seal is placed at the junction of the container body and the lid. In said application, a hollow rubber hose manually mounted on the cover is used as a seal. Such a rubber seal provides a good seal, but such a procedure is not widely used due to the high cost of the tire rings or similar seals 2,84581 and the amount of work required to install them. On the other hand, some kind of labyrinth seals are used, which to some extent improve the tightness of the vessel, but their manufacture requires very precise production, i.e. small tolerances, and such structures are also not widely used.

It is therefore an object of the present invention to provide a new type of container with a lid in which the sealing has been made very effective without, however, using the expensive solutions described above. A container according to the invention which fulfills this object is characterized in that the rim of the container body and the ridge of the cover have cooperating surfaces to limit the pressure exerted by the ridge on the seal. By feeding the tii-15 seal into its groove in the form of a substantially fluid mass, the seal can be fitted in a fully automated manner, and the cross-sectional shape of the groove ensures that it remains in place even in situations where the adhesion of the sealant to the cover material itself is impaired. On the other hand, in order to guarantee the tightness between the container body 20 and the lid, a ridge pressing against the seal is formed on the edge of the container body, which to some extent penetrates inside the seal. However, such penetration is limited by the surfaces on the lid and the container body, which limit the pressure on the seal even when several containers are stacked on top of each other.

In the following, a container with a lid according to the invention will be described in more detail with reference to the accompanying drawing, the figure of which shows a partial cross-section of the connection area between the container body and the lid.

In the figure, reference numeral 1 denotes a container body, the open mouth of which is surrounded by a rim 2 terminating in a downwardly pivoting skirt 3. In order to maintain the desired rim shape, 35 reinforcing ribs 12 are placed between the skirt 3 and the container body 1. The rim 2 is adapted to operate. together with a trough-shaped groove 5 fitted on the circumference of the container lid 4 to close the container substantially tightly. This bead 5 comprises at its outer edge a flange 13 which cooperates with the skirt 3 of the container body 5 1 to lock the lid 4 in place.

This locking is provided in the flange 13 by a protrusion 14 formed inside the flange, which when pressed over the opening of the container body is forced to protrude past the skirt 3 of the container body 1, snaps under the skirt 3 and prevents the lid from being lifted from the container body without twisting the skirt 13 outwards. . It is to ensure this locking that support ribs 12 are placed in the rim 2 of the container body 1.

In order to make the connection between the container body 1 and the lid 4 tight, a groove 6 is formed on the inner surface of the lid 4 of the lid 4, in which a seal 7 is fitted. The groove 6 for the seal is formed to widen towards its bottom. This ensures that the seal 7 fitted in the groove in the form of a flowable mass remains in place after the mass of the seal-20 has hardened into a resilient seal. Certain thermoplastic materials can be used as such a sealing compound, such as a substance marketed under the trade name DARAMELT or a microwave vulcanized PVC plastisol marketed under the trade name DARAWAVE. Naturally, other elastic or soft materials with similar properties are also possible. It is desirable that the sealing compound adheres to the material of the cover 4 when it is cast in its groove 6 in the cover 5 of the cover. However, very good adhesion is not necessary due to the shape of the seal-30 groove which ensures that the seal 7 remains in place in all situations. In the exemplary case shown in the figure, the downward widening of the groove 6 is achieved by forming one of the tongue-like side surfaces delimiting the groove 6 obliquely. Of course, both side surfaces can also be inclined if desired, but this would make it difficult to manufacture the lid by the injection molding method.

A ridge 8 is formed in the rim 2 of the container body 1 opposite the seal 7 of the lid 4, which when pressed onto the container body 1 presses into the seal 7. This ridge 8 makes it possible to ensure a very good seal between the container body 1 and the lid 4. In order to prevent the weight of any stacked containers from being left solely on the seal 7, which could damage this seal, cooperating surfaces are formed on the lid 4 and the container body 1, which limit the indentation of the ridge 8 inside the seal 7. These surfaces 9 and 10 are formed in the areas adjacent to the ridge 8 of the seal 7, respectively. These surfaces, on the other hand, comprise a substantially horizontal portion which receives in particular the downward forces acting on the cover. On the other hand, these cooperating surfaces 9 and 10 also have inclined portions at an angle of about 45 ° to the horizontal portions, whereby a triangular ridge 11 is formed on the rim of the container body 1 just above the upper edge of the container body. forces but also forces tending to push the cover 4 in the direction of its center. A load in this direction is generated when a weight is applied to the central area of the lid 4, for example when stacking full containers on top of each other.

When using the sealing solution according to the invention, in which the seal is thus cast in a certain way in the groove in the cover 30, no unusual requirements are imposed on the manufacturing tolerances. This is based on the fact that a seal which is cast in its groove in the form of a flowing mass always settles in the form of a groove reserved for it, which is thus not critical. On the other hand, the shape or location of the ridge 8 in the rim of the container body 1 is also not critical, as long as it happens opposite the seal 7. On the other hand, the manufacturing accuracy of the flange 13 of the lid 5 of the lid 4 as well as the manufacturing accuracy of the skirt 3 of the container body 1 are not critical, as small changes in the dimensioning of these components are automatically compensated by the resilience of the seal 7.

The lid container according to the invention has been described above by means of only one exemplary embodiment and it is understood that several design changes can be made to it without, however, deviating from the principle of cooperation between the container body and the lid according to the invention.

Claims (1)

A plastic container with a lid comprising - a container body (1) open at one end, the open mouth 5 of which is surrounded by a rim (2) terminating in a downwardly pivoting skirt (3), - a lid (4) for closing the open end of the container body (1) substantially tightly, having a trough-shaped groove 10 (5) compatible with the container body rim (2) for locking the lid relative to the container body, the inner surface of the lid (4) having a groove (6) widening in cross section towards its bottom and fitted with a resilient seal (7) ) in the form of a substantially flowable mass, and a ridge (8) in the rim (2) of the container body (1), pressing against the lid seal (7), characterized in that - in the rim (2) of the container body (1) and in the lid bead (5) have cooperating surfaces (9, 10) to limit the pressure exerted by the ridge 20 (8) on the seal (7). 7 84581 Plastic trolley with lock lock - not included in the compartment (1) shank compartment 5 (2) with slipper and socket (3), - for the purpose of cleaning the compartment (1) open the lock (4), the handle is different if the lock is on the edge of the lock (2) hoppassande rännformad 10 fals (5) för läsning av Locket i förhällande account kärls-tommen, varvid inre ytan av lockets (4) fals ( 5) uppvisar ett accounts tärvnnittet mot sin botten sig utvidgande sp & r (6), color anordnats en elastic tätning (7) väsentligen i form av flytande massa, och 15. en mot lockets tätning (7) anliggande kam (8) i kärlstommens (1) ) kant (2), kännetecknat därav, att - kärlstommens (1) kant (2) och lockets fals (5) uppvisar samverkande ytor (9, 10) för begränsning av 20 trycket som palmmen (8) utövar pä tätningen (7).