NL8300429A - DETACHABLE COVER OF PLASTIC, PARTICULARLY FOR CLOSING BARRELS OF THIN METAL PLATE. - Google Patents

Description

4.

* -1- VO 4550

Removable lid made of plastic, especially for closing drums made of thin metal plate.

The invention relates to a removable lid of plastic, in particular for closing drums of thin metal plate, eg cylindrical, oval-conical and similar buckets, in the form of a cover lid with adjoining the edge of the bottom 5. inner and outer collars with the profile of an inverted U, wherein the radial distance between the inner and outer collars is designed such that the free hull end of the vessel, preferably provided with a beaded edge, is fitted in the closed condition of the lid includes.

10 For the optimum practical use of drums, the properties and reliability of the sealing elements play an important role in the suitability of the drums for packaging, storage and transport.

For example, the cover which generally serves as a sealing element must be able to be closed relatively easily in addition to the main condition of its own which is of an optimum density and must also require the smallest possible axial force during application, 20 - allow the centered arrangement of closed equal containers, both in terms of construction and axial load, and in addition to ensure the stacking of a number of pallets provided with closed drums, a load-bearing capacity withstand impacts from the interior of the drums during transport and also with a long static load, - practically do not allow any unpacking during transport, - allow easy opening and closing without the need for a lid and / or hull damage occurs, without the use of auxiliary tools and without the closing gasket t-ness is influenced and can be stacked by one another, so that automatic lids can also be fitted to the dirtier.

35 8300429 A »-2-

In general, metal plate vessels, such as, for example, cylindrical or oval-conical buckets, have hitherto been closed with metal plate lids. Experience has shown that sheet metal covers are apparently best able to meet the foregoing requirements.

In any case, in practice there are hardly any larger numbers of pieces of vessels of the type mentioned, which are closed, for example, with plastic lids, which in terms of the structural basic design have been taken from the area of plastic buckets, where such lids are in a wide variety of embodiments are used.

Embodiments of plastic lids which have features according to the preamble are known per se (eg German "Offenlegungs-script" 2,806,339, and German "Gebrauchsmusters", 7,919,123 and 7,912,777).

The object of the invention is to further design the container lid according to the preamble in such a way that the possibility of its application in connection with vessels of thin metal plate, eg of the type indicated in the preamble, can be further improved and without any objection a wider scope of application can be extended, fulfilling the aforementioned requirements in an even better framework.

According to the invention, this task is solved in that the flat lid bottom merges radially outwards via an upwardly directed stair section into the inner collar, which consists of a ring section directed at a right angle downwards and a radially inwardly inclined end section, whereby the staircase part connects a divergent wall part to the inner collar, the wall part of which the slope corresponds to that of the outer wall of the end part of the inner collar.

This lid, characterized in this way, not only fulfills the above-mentioned requirements in a reliable form, but also has the further special advantage that the bottom drop of the superposed container is centered when superimposed identical containers are placed on top of one another. on the flat part of the staircase part of the lid of the respective container underneath, whereby the axial load provided by the weight (vessel and filling material) is absorbed by the staircase part and at least partial components of the pressure force generated therein are transferred to the inner collar, which, in connection therewith, makes the ring part contact more strongly, in particular with force, against the inner wall of the upper end of the container body. This creates, together with an increased density, an increased force closure of the lid in the closed position.

According to a further feature, the ring portion of the inner collar is cylindrical, and the end portion extends towards the end, the free end itself being arcuately inclined. This construction stabilizes the edge area of the lid, and simultaneously improves centering of the lid in the bucket opening, as well as centering when stacking similar lids together.

In connection therewith, it is particularly advantageous that the end portion of the inner collar substantially starts in. it. area of the area spanned by the inside of the lid bottom. This results in an optimum length of the end portion and the required resilience thereof associated with it.

In connection therewith, the feature that the free end of the end portion, which substantially extends the height of the staircase portion, extends beyond the plane formed by the inside of the lid bottom, is particularly favorable.

According to a feature, the outer collar provided in a manner known per se on the inner side of a bead has a length which, with the height of the staircase section, is less than the length of the inner collar.

For better stacking of the lid, the end portion of the collar according to a further feature may be bent radially outward.

Finally, the container itself can be improved in terms of its resistance to twisting according to a further feature, in that the stair section is provided on the inside with corrugated ribs known per se.

The invention is further elucidated with reference to the drawing, in which: figure 1 is a section of a part of the lid, figure 2 is a section of the upper part of a metal plate vessel with the lid placed thereon, figure 3 a number of lids stacked with one another, and figure 4 is a representation of the vessel equal to figure 2 ______ 8300429 ^ ΐ * * -4- with an equal metal vessel placed thereon.

With the reference number. 1 is in the figures. 2 and 4 indicate the upper part of a body of one. barrel of thin metal plate. This may, for example, be packaging containers of different shapes, eg cylindrical, oval-conical and similar buckets, which have a substantially nominal content between 10 and 20 1. As further shown in figure 2, the free end of the hull provided with a bead 2. This can be round, long-oval, etc. depending on the type of container.

The lid, which is generally indicated by the reference numeral 3 and in the form of a cover lid, is most clearly derived from Figure 1. It has a lid bottom 4, which extends radially outwards via an upwardly directed stair section 5 in an inner collar 6, which together with an outer collar 11 in profile forms an inverted 15 µ. The radial distance as well as the shape between the inner collar 6 and the outer collar 11 are such that the open hull end of the vessel, preferably provided with a bead 2 and the like, is included in the closed state of the lid 3 in shape and / or force-fit.

The inner collar 6 has a ring portion 7 directed downwards at right angles to 20 of the stair portion 5, which is cylindrical and merges into an end portion 8 which tapers towards the free end and is inclined radially inward. The free end is additionally curved inclined.

Above the stair section 5, a divergent wall section 9 connects to the inner collar 6, the inclination of which corresponds to that of the outer wall of the end section 8 of the inner collar 6. The angular positions of the wall section 9 on the one hand and of the end section 8 for the arcuate curvature of the free end inwards, correspond mathematically to "alternating angles". The two surfaces correspond to each other, as can be derived from figure 3, because they cooperate centrally when stacking the same lids.

With regard to the size ratios of the individual parts of the lid in connection with the operation, it has been found that the end portion 8 of the inner collar 6 must start substantially in the area of the plane spanned by the inner side 10 of the lid bottom 4 (see figure 1). Furthermore, the free end of the end portion 8300429 * m <r -5- of the inner collar 6 with substantially the height of the step portion 5 must protrude beyond the plane formed by the inner side 10 of the lid bottom 4. These two size requirements make the operation of the end portion 8 optimal.

As furthermore appears from the figures, but in particular from figure 1, the outer collar 11 has a 12 on the inside in a manner known per se, which, as appears from figure 2 or 4, in the closing position of the cover 3 snaps under the bead 2 and thus takes an important part in the closing action, which, as already mentioned, is determined jointly by the radial distance, as well as the shape between the inner collar 6 and the outer collar 11, whereby it is of a bead 2 provided open end of the roup 1 of the vessel in the closed state of the lid in shape and / or force-fit. Here, a specific adjustment of the plastic material of the lid 3 with regard to its resilience has a favorable effect.

In the lid embodiment shown in the drawing, an end portion of the outer collar 11 is bent radially outward. This constructional feature has the advantage that with a mechanical removal of stacked equal lids in the frame of the automatic closing of vessels therewith, a better removal possibility is given.

In order to improve the twist resistance of the lid per se, the stair portion 5 may be provided on the inside with ribs 14 known per se.

From Figure 2, which shows the closing position of the lid 3 on a metal vessel in the form of an exemplary embodiment, it becomes clear in connection with the present features that here practically ideal conditions are provided for a good closure of a metal. container, whereby the design of the inner collar 6 and the outer collar 11 in cooperation with the adapted plastic material provides an optimum form and force closure, which is a prerequisite for a reliable seating of the lid 3 on the container. In addition, in this case, the length of the inner collar 6 and the relatively large-surface abutment against the inner wall of the container body, therefore, provides an ideal sealing possibility. When loaded by one or more superimposed containers of the same type filled with stuffing material, 8300429 -6- «I *, the closing and sealing action is not only unaffected, but at the most intensified, because the axial load extends through the inner collar 6 turnover in important partial components with radial pressure. The superposed filled containers each rest with the bottom bead edge on the horizontal plane of the stair portion 5, the diverging wall portion 9 centering in the sense of securing the stack.

To facilitate removal of the lid 3 or the lid 3 from the filled container. the overall handling thereof, the outer edge of the cover 3 may, for example, in the area of the outer collar 11 10 at suitable locations have a per se known, slightly outwardly projecting spring strip (shown in the drawing).

8300429

Claims (6)

Cover according to claim 1, characterized in that the ring portion (7) of the inner collar (6) is cylindrical, the end portion (8) tapering towards the free end, which is arcuately inclined. Lid according to claim 2, characterized in that the end portion (8) of the inner collar (6) starts substantially in the region of passing through the inner side (IQ) of the lid bottom. (4) span flat. Lid according to claim 2, characterized in that the free end of the end portion (8) of the inner collar (6) with substantially the height of the stair portion (5) outside the through the inner side (10) of the lid bottom (4) shaped plane. Cover according to any one of the preceding claims, characterized in that the outer collar (11) provided on the inside of a bead (12) has a length which is smaller than the height of the step section (5). of the inner collar (6). Lid according to any one of the preceding claims, characterized in that the end portion (13) of the outer collar (11) is bent radially outwards. Lid according to claim 1, characterized in that the step section (5) is provided on the inside with corrugated ribs (14). 8300429 --- II ^