FI53431C - PLASTBEHAOLLARE MED FOERSPAENT LOCK - Google Patents

Description

IvtLVH ΓβΙ ^ ADVERTISING PUBLICATION

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Patent and Registration Office .... ...... ,. ., _ ^ \ (44) Date of publication of the decision. -

Patent · och registerstyreisen AmMcm utlsgd ech uti ^ krtfun pubttcarad 31.01.78 _ (32) (33) (31) Pyy4 «ttjr« tuolkwt — teglrd priority 07.03.72

Denmark-Danmark (DK) 10 ^ 7/72 ^ (71) Superfos Emballage a / s, Agerup, ^ 390 VipperjJd, Denmark-Danmark (DK} (72) Erik Bock, Lindholm Bakkevej 6, 3550 Slangerup, Denmark-Danmark ( DK) (7 * 0 Tampereen Patenttitoimisto (5 * 0 Plastic container with prestressed lid - Plasthehällare med förspänt lock

The invention relates to a plastic container with a prestressed lid, which lid closes tightly to the edge of the mouth of the container with a narrow sealing edge at its lower surface and which at a radial distance _ turns into a downward, annular lid flange. , to the downward flange.

The object of the invention is to provide a container which is easy to manufacture, e.g. because both the container and the lid are suitable for injection molding and for a tight and effective fastening of the lid without the use of seals and for the lid to be removed and replaced without tools and for the tank to be automatically closed after filling by a flat locking plate to press the lid squeezing the edges down.

2 53431

The plastic container according to the invention is characterized in that the edge portion of the lid freely forms an upwardly conical surface outside the sealing line, which with a sharp fold engages the downward lid flange and that the distance between the edge of the container mouth and the between the inwardly facing brush of the cover flange with the cover loose.

By forming the edge portion of the lid so as to form an upwardly directed conical surface outside the sealing line, which blade-> gap is connected to the downward lid flange, the advantage is that when placing lids in containers after filling in an automatic sealing machine the lid can only be closed with a planar locking plate from the raised rim downwards, at which point the lid flange joins the conical part with a sharp fold, the compressive force acting to compress the lid edge downwards acting on a relatively long torque arm whose pivot point is on the sealing line between the lid and the container, i.e. a high closing force is provided and in the prestressed, closed position of the lid a strong tightening is provided per unit area, i.e. a good seal without the inner sealing ring in the lid. The prestress in the axial direction resulting from the distance between the edge of the container mouth and the downwardly locking edge of its flange being greater than the vertical distance between the lid sealing line and the top edge of the lid flange inwardly with the lid loose further provides the advantage that the dimensions of the parts are not which is of great importance in the manufacture of parts by injection molding. The downwardly facing flange of the lid can be made relatively thin so that the lid can be easily removed by hand. The space between the two contact lines further helps to prevent the contents from penetrating out due to the capillary action, which is important when the container is used for oils or solutions.

German application publication No. 1,955,162 discloses a container lid with a downwardly directed flange having an inwardly extending strip engaging the downwardly locking edge of the corresponding container flange 3,53431, but in this construction an attempt is made to provide a seal in the wide axial prestressing is achieved by pressing a downwardly bent joint between the lid and the downwardly directed lid flange, which means that the same compression on a flat locking plate provides a lower sealing pressure per unit area than the container of the present invention because compression cannot act on a relatively long torque arm. As a result, this known container is practically not used without a sealing ring placed on the lid when it is used for the storage of paints and the like, where a tight seal is crucial. In addition to this, there is the disadvantage that neither the lid nor the container with its bent joints in the flanges is suitable for production by the injection molding method. Due to the shape of the flange, it follows that the closed lid can usually only be opened using a tool.

According to the invention, it is preferred that the flange of the container leaves the container wall at a certain distance from the sealing edge and extends downwards against the circumference of the flange of the lid. This results in an easy setting of the lid and thus in an easy closing of the container, which can be done automatically by means of a closing plate or by hand.

The design of the container edge ensures that the inevitable suction points in the middle of the molded hanging points in the material do not occur at the sealing edge and cause sealing disturbances, as is the case with all conventional injection molded plastic containers.

An embodiment of the container according to the invention is characterized in that below the lid, radially outside the sealing line, there is a circumferential, projecting edge which rests against the edge part of the wall of the container. Said edge contributes to the full utilization of the possibility of stacking the plastic material, so that by resting against the outer edge of the container wall it prevents the stacking forces from resistant.

The invention will be described in more detail in the following description with reference to the drawing, in which Figure 1 shows a longitudinal section of a suitable embodiment of a container according to the invention and Figure 2 shows a partial view of the lid in Figure 1 enlarged.

The container shown in Figure 1 has a slightly conical side wall 1 with lugs 2 projecting at the top of the wall for the bracket. A flange part 3 with an arrow-shaped cross-sectional shape is formed on the upper edge of the container, with an outwardly and downwardly directed flange 4 slightly below the container edge, the lower edge of which forms a sharp latch edge 5 · The upper edge part 6 of the container wall forms part of the sealing flange part With 7 edge flanges. The lid has a substantially planar central plane 8, the surface area of which is so large that another similar container can be placed on it. The edge portion of the lid plane 8 pivots with a sharp, almost rectangular fold into an upwardly directed flange portion 9 intended to rest against the inner surface of the upper edge 6 of the container. This flange part 9 forms a W-shaped edge flange in cross section, an inner branch with an approximately axially projecting rib, i.e. a central flange 10, which rests against the outer surface of the container wall edge part 6, and an outer circumferential flange part 11, the flange parts the upper surface 12 likewise turns into a flange portion 11 with a sharp fold. A brush 13 is formed on the lower edge of this outer flange portion 11, which when the lid 7 is placed on the container can be snapped under the latch edge 5 of the container edge flange 4 when the outward and upwardly directed edge portion 12

The otherwise planar central surface 8 of the lid is provided with a downwardly directed reinforcing rib 15, which does not prevent the lid from being loaded, e.g. by another similar container. It is found that such a vertical load on the middle surface 8 of the lid cannot cause 5 53431 bending and torques in the flange parts due to the sharp-edged folds, so that the flange parts cannot deform and the lid seal does not suffer and there is no risk of the container stack collapsing. The lid is prestressed in the axial direction of the container by squeezing the edge flange downwards, and the positioning and removal of the lid when it is locked by elastic locking can be easily performed without the use of tools. Prestressing in the axial direction gives a very special advantage when using square containers, whereby the tightness of the lid is otherwise achieved only with very fine tolerances. However, the axial prestressing of the cover is advantageous from a manufacturing point of view, since the tolerances of the horizontal dimensions of the parts are then not critical. Likewise, the simple design of the flange part of the container is advantageous from the manufacturing point of view, because a simple outwardly directed flange can be made without the use of special cores which are moved in the direction of the container wall, which is completely impossible for e.g. the container shown in Fig. 1. lugs 2 immediately near the edge flange. The design of the container edge portion and the lid edge flange shown is, as mentioned, advantageous in containers with both a circular and an angular cross-section.

Claims (3)

6,53431 A plastic container with a prestressed lid, which lid closes tightly from the narrow sealing edge at its lower surface to the mouth part of the container and which at a radial distance therefrom turns into a downwardly directed annular lid flange with an inwardly extending ridge that the edge portion (12) of the lid forms an upwardly extending conical surface outside the sealing line which, with a sharp fold, joins the downwardly directed lid flange (11), and that the vertical distance between the edge of the container mouth and the downwardly locking edge (5) of its edge flange is greater than the vertical distance between the plane of the sealing edge of the lid (8) and the inwardly facing ridge (13) of the lid flange with the lid detached. Container according to Claim 1, characterized in that the container flange (4) protrudes slightly beyond the sealing edge of the container wall and extends obliquely downwards against the circumference of the lid flange. Container according to Claims 1 and / or 2, characterized in that below the lid, radially outside the sealing line, there is a circumferential, projecting strip (10) which rests against the edge part (6) of the container wall.