DE3135695C2 - Plastic lid closure arrangement for a plastic barrel that can be closed with a tightening strap - Google Patents

Abstract

A multi-stage sealing and locking system is proposed for a plastic drum that can be closed with a plastic cover and a tensioning strap. A support surface (7) formed on the barrel neck (2), projections (8) and a circumferential surface (11) as well as recesses (21) with support lugs (23) formed in the outer edge (14) of the lid (4) act when closing of the tension band (10) so that in the event of normal transport and normal manipulation, a sealing ring (17) in the cover (4) is loaded with a predetermined sealing force and that in the event of an overload, the entire locking system is stiffened, with an additional , but limited sealing force is applied to the sealing ring (17). It is not possible to compress the sealing ring (17) to such an extent that permanent deformation occurs.

Description

a) on the recesses (21) in the lid outer edge (14) is symmetrical with respect to their Extension directed parallel to the cover axis, at least one from the top edge (22) protruding nose (23) which extends approximately to the middle of the recess (21) is provided;

b) the barrel neck (2) has an annular support surface running all around at the level of the bead (6) (7), the width of which corresponds to the thickness of the lid outer edge (14);

c) below the support surface (7) is in each case one of the recesses (21) in the outer edge of the lid located noses (23) in terms of position and spacing assigned, radially protruding, balcony-like projection (8) provided with receiving fields associated with the noses;

d) on the outer edge of the balcony-like projections (8) are assigned to the lugs (23) Stop cams (9) are provided, which prevent them from snapping out;

e) under the projections (8), at a distance which corresponds to at least the width of the tensioning strap (10), there is an annular circumferential surface (11) known per se, from which the barrel neck (2) enters the barrel body (1) transforms.

2. Plastic barrel according to claim 1, characterized in that in the balcony-like projections (8) stiffening ribs (25) are arranged.

The invention relates to a plastic lid closure arrangement, which can be closed with a tension band, for a plastic drum, the neck area of which has a circumferential bead directed towards the inside of the drum at a distance from the upper edge and in which the lid is provided with an inner edge and an outer edge in which Connection is a circular groove (ring groove) which serves to accommodate an elastic sealing ring, the inner edge of the lid reaching at least as far as the bead of the barrel neck and the outer edge of the lid being divided into approximately rectangular recesses and into tabs with a freely protruding bent tab edge, over which the tensioning strap for fixing the lid on the barrel neck runs.

In the case of plastic barrels with a lid closure, i.e. wide-necked containers, the highest demands are placed on the Drop resistance and tightness, since the stresses that occur in every fall if the container closes does not withstand, through leaks and tearing of the closure, lead to major damage can.

A large number of closure systems and sealing systems for plastic wide-necked drums have therefore already been proposed been. Thus, DE-OS 29 35 748 shows a Weil neck barrel made of plastic, in which a barrel neck when blowing the barrel is cured outer collar is provided, which is an annular groove to the top

ι -, receptacle of the outer edge of the lid and downwardly an all-round uninterrupted locking edge for inwardly protruding locking lugs for bracing the tensioning straps of the lid. This is a relatively simple lock that is used in the

2o * ^ä | Normally also offers sufficient tightness, but has ^? It has been shown that in the unfortunate fall of the barrel, the edge of the lid, the closure, tends to pop open. This is explained by the fact that the locking edge and the locking lugs of the clamping straps, like the whole

> -, barrel and lid, are made of plastic and this material has a very low frictional resistance to each other, which in the extreme case of this arrangement then favors the opening of the closure

A similar closure, with a radially effective securing element, is also shown in US Pat. No. 3,817,419. Here a locking nose engages from the lower edge of the lid under an edge on the barrel neck, to secure the barrel lid. It is of great disadvantage that any load on the lid, so to speak, is too fine "extension" of the outer edge of the lid, which inevitably leads to an unlocking of the locking nose, that is, the cover closure will pop open.

This disadvantage should according to the DE-GM 78 19 030 can essentially be eliminated by the fact that with a closure for wide-necked drums with Segment-like projections distributed on the circumference and lid segments engaging between them angled foot parts each rest on an abutment formed outwardly from the barrel body.

The formation of the abutment, which is a complicated molding device, remains disadvantageous requires and the unrmand that the ceiling segments

so all unsupported over a relatively large length Cover loads, including the stacking pressures, have to absorb. This can lead to distortions in the Lid segments and leaks in the entire lid closure come.

This resulted in the object underlying the invention, in the creation of a with a Plastic lid and a strap lockable plastic wide neck barrel consisted of a Sealing and locking system, which withstands the toughest requirements and in which the disadvantages of known barrels are eliminated.

This object was achieved according to the invention for plastic barrels of the type mentioned at the beginning by the combination of the following features:

a) is on the recesses in the lid outer edge, symmetrical with respect to their parallel to the lid axis directed extension, at least one each

J from the top edge to about the middle of the

Protruding nose reaching into the recess

see;

'(> b) the neck of the barrel shows at the level of the bead a

annular support surface running all around, ^r > the width of which is the thickness of the outer edge of the lid; is equivalent to;

} c) below the support surface there is one in each case located at the ^h recesses in the outer edge of the lid

Noses with position and spacing assigned, id radially protruding, balcony-like projection with the receiving fields assigned to the Nasr.-rt are provided;

|: d) on the outer edge of the balcony-like projections , 'are stop cams r> assigned to the noses

'* are provided, which prevent them from snapping out

; to the;

e) under the projections, at a distance which corresponds at least to the width of the tensioning strap, there is an annular surface known per se, from which the barrel neck merges into the barrel body.

To stabilize the balcony-like projections, stiffening ribs η can be arranged in the same.

The particular advantages of the 'plastic barrel according to the invention are above all that by a multiple interlocking of the closure elements extremely tight security is achieved. jo

It is essential that, through the multiple support of the outer edge of the lid, even with long 'Continuous, greatest stacking load, the lid seal only to a predetermined, relatively small extent stressed and can never be excessively compressed jo. This maintains the full sealing effect - also received over long periods of great stress.

The arrangement of the recesses in the outer edge of the cover also brings other surprising advantages, specifically for removing the cover, especially in the case of highly viscous fillers that stick to the cover during transport. Outer air can then enter the barrel through the recesses, which is not the case with lids with an all-round closed outer edge. The opening of such barrels, which saw in the crowd very often requires much time and effort is, however, perform effortlessly in the inventive barrel.

Finally, the manipulability has been significantly improved because the barrel is all around closed, protruding and kinked tab edge with a "steering wheel effect" safe and secure can easily roll off on its lower edge.

The following is an example of implementation the drawing explained in more detail. In the picture shows

Fig. 1 is a view of the barrel upper part, left with the cover removed), right with attached Lid.

F1 g. 2 shows a section through the upper part of the barrel with the lid attached along the line H-II in FIG. I ₁

F i g. 3 one per. , effective section of the lid,

4 shows a perspective section from the barrel neck.

From the barrel body 1, the barrel neck 2 rises, which, in general terms, carries the border 3 leading to Recording and locking the cover 4 is required.

The essentially straight barrel neck 2 has, below its upper edge 5, a circumferential bead 6 directed towards the inside of the barrel, the underside of the bead extending towards the outside of the barrel and a support surface 7 running all the way around. Underneath the support surface 7, balcony-like projections 8 with stop cams 9 are formed, pulled out of the barrel neck 2 in the direction of the exterior of the barrel and distributed evenly over the entire circumference

Below the projections 8 followed by another straight piece of Faßhalses 2 in an amount which corresponds to the width of the clamping band 10 and which is followed by the further annular Umlauffiäche 11, then passes from the group consisting of the barrel neck 2 in the barrel body. 1

The lid 4 consists essentially of the lid base 12, the inner edge 13 and the outer edge 14. In the connection 15 of the inner edge 13 with the _t outer edge 14 there is an annular groove f (annular groove) 16 in which an elastic sealing ring 17 is seated

The inner edge 13 is drawn down at least to the bead 6 and the lid base 12 is located at an altitude between the upper edge 5 of the barrel neck 2 and the bead 6.

The outer edge 14 of the lid 4 extends essentially parallel to the barrel neck 2. At the lower end of the outer edge 14 the same goes into approximately, at right angles connecting tabs 18, which in turn end in a kinked tab edge 19, which is only interrupted by narrow separating slots 20 to the entire circumference of the outer edge 14 runs • Evenly distributed over the circumference and assigned to the balcony-like projections 8 on the barrel neck 2 in terms of position and position, there are window-like, essentially rectangular recesses 21 on the outer edge of the lid 14, which open to the angled tabs 18 are.

Symmetrical with respect to the extension of the recesses 21 directed parallel to the cover axis, protruding lugs 23 extending from their upper edge 22 to approximately the center of the recesses 21 are arranged.

When the cover 4 is placed on the barrel neck 2 with the tensioning strap 10 open, the following happens:

The sealing ring 17 sits on the upper edge 5 of the barrel neck 2. The top edge 22 of the recesses 21 is inserted above the support surface 7. At the same time, the lugs 23 sit over the receiving fields 24 of the Projections 8 between the stiffeners 25 and in front of the stop cams 9. The tabs 18 sit down over the circumferential surface 11.

The entire circumference of the barrel neck 2 is now covered by the cover 4, because each recess 21 one follows in each case up to the circumferential surface 11 Piece of outer edge 14.

Now the tensioning strap 10 is closed and the cover 4 thereby over the inclined pulling surfaces 26 of the Projections 8 pulled into the locking and sealing position. The sealing ring 17 is now with a predetermined force loaded in such a way that the seal is certainly sufficient for normal manipulation and transport.

If the barrel falls or if the stacking load becomes too high, i.e. if there is an overload, the sealing ring 17 compresses further until the upper edge 22 of the recesses 21 rests on the support surface 7, the lugs 23 on the receiving fields 24 and the tabs 18 on the Put on the circumferential surface 11 at the same time. Now is that

The entire locking system is rigidly and tightly locked and the sealing ring Yl is loaded to a predetermined extent, which cannot increase any further and ensures that no permanent compressions or deformations occur. The sealing ring 17

thus preserves its sealing function and leaks, for example, even over long-term overloads after a long sea transport with a high stacking load, no longer occur.

For this purpose 2 sheets of drawings

Claims (1)

Patent claims: 1. Plastic cover that can be closed with a strap Closure arrangement for a plastic barrel, the neck area at a distance from the Upper edge has a circumferential bead directed towards the inside of the barrel and in which the lid is provided with an inner edge and an outer edge, in connection with which a circular groove (ring groove) is located, which serves to accommodate an elastic sealing ring, wherein the inner edge of the lid extends at least to the bead of the barrel neck and the outer edge of the lid extends into approximately rectangular recesses and in tabs with freely protruding kinked Tab edge is divided over which the strap to fix the lid on the Barrel neck, characterized by the Combination of the following features: