RU2465184C2 - Reservoir in form of tin made of sheet metal with cover made of sheet metal - Google Patents

Abstract

FIELD: transport, package. ^ SUBSTANCE: invention relates to reservoir in the form of tin made of sheet metal with removable cover made of sheet metal. The cover is protected against accidental opening by resilient plastic safety ring (24) which is made as annularly closed profile containing substantially U-shaped portion forming opened from bottom ring channel, which envelopes peripheral edge of cover and opened edge of tin and protects the cover, and using ring shoulder (29) engages under radial projecting portion (12) of opening edge portion (6) of tin. The safety ring (24) contains weakened spot (34) which can be torn to open reservoir under action of tearing forces exceeding specified maximum load for reservoir handling. The safety ring contains spot (37) of engagement located next to weakened spot for tearing tool (38) in order to provide by rocking motion tearing of safety ring on weakened spot which is essentially invisible. Engagement spot (37) for tearing tool (38) is formed by projection of the safety ring (24) which projection is located on outer side of the mentioned ring under shoulder for engagement of the mentioned ring. The mentioned projection passes near lower skirt edge and contains hole which is opened at least down. ^ EFFECT: invention permits to provide quick opening and closing tin made of sheet metal with cover made of sheet metal using simple tool. ^ 6 cl, 4 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a container in the form of a sheet metal can, with a sheet metal lid, in accordance with the restrictive part of paragraph 1 of the claims below.

BACKGROUND

For storage and transportation of hazardous products (goods), there are various solutions for containers, for example, containing some kind of safety ring that holds the lid and can together even in case of excessive pressure and mechanical stress. However, no effective solutions have been created for conveniently closing such containers and conveniently removing the safety ring for the intentional opening of the can.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a solution in which a container in the form of a sheet metal can with a sheet metal lid and a safety ring can be quickly closed and opened using a simple means.

The aforementioned task is achieved by means of a container according to the invention, the characteristics of which are determined from the following paragraph 1 of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Below the invention will be described in more detail using an exemplary embodiment with reference to the accompanying drawings, in which:

figure 1 depicts a side view of a container according to the invention,

figure 2 depicts on an enlarged scale part of the cans of sheet metal with a lid,

figure 3 depicts a perspective view of the container immediately after breaking the safety ring using a tearing tool, and

figure 4 depicts schematically the direction of flow during injection molding of the safety ring forming part of the tank.

OPTION (OPTIONS) FOR CARRYING OUT THE INVENTION

The container 1 according to the invention is mainly intended for the storage and transportation of hazardous products, for which high packaging requirements are imposed so that this container does not accidentally open under the influence of abnormal forces. The capacity consists of a can of 2 sheet metal with a cover 3 of sheet metal, as can be seen from figure 1. Therefore, the capacity 1, i.e. both the can and the lid are made of a relatively thin-walled plate, usually of a tin plate, which is uniform in thickness and made of a flat or rolled sheet blank, for example a steel plate, with a surface coated with tin on at least one side and, possibly painted at least on the other hand. The plate can also be painted on the inside for enhanced corrosion protection. The plate thickness is in the range of, for example, 0.1-1.0 mm, usually 0.1-0.5 mm. To reduce the consumption of material and, consequently, cost and weight, for example, for paints, a relatively small thickness of the material is selected, in addition, during the molding operation, especially in the edge sections, a relatively high dimensional stability is achieved.

At the bottom of the can 2 contains a base 4, which is usually flat and connected to the peripheral body wall 5, which extends upward from the base and which is usually slightly conical or possibly cylindrical. The connection to the base is carried out, for example, in the usual way by rolling and sealing, so that a sealed connection is formed. The body wall 5 is closed by the junction of the plate. In this example, the handle 7 is fixed in the case wall 5 of the can 2.

As can be seen from the section in figure 2, the housing wall passes at the top into the peripheral annular opening edge portion 6, which surrounds the opening of the can, which is usually closed by the cover 3. It also contains a peripheral edge portion 8, which is designed to be connected with seals with an opening edge 10 of the can and for attaching the lid in the closed position.

The opening edge portion 6 of the can can be best seen from FIG. 2 and is formed by the protruding part of the housing wall 5. This means that the same sheet, which is cut to a predetermined size to form the housing wall 5, contains, in addition to the straight profile section, forming a housing wall, a protruding section, which forms, firstly, the opening edge section itself and, secondly, an additional section, the function of which is described in more detail below.

The opening edge portion 6 of the can is formed by a body wall 5 that bends outwardly in the upper part to form a rounded ridge 9, for example, in the form of an arc, and from there passes into the outer edge portion 11, which is located at an angle radially outward and downward from the ridge, the outer edge portion in the illustrated example, it is rectilinear in cross section and generally forms the shape of a truncated conical surface, i.e. essentially conical.

In the lower part, this conical section 11 passes into the annular edge section 12 with a ledge and extends towards and abuts against the surface 13 of the shell of the can 2 under the opening edge section and is wrapped (twisted), forming a hidden edge end closure 14 to strengthen the structure as a whole.

Below will be described in more detail the cover 3, which is clearly shown in section in figure 2. The lid contains a peripheral edge portion 15, which on the outside contains an edge flange 16, which, with the help of an intermediate sealing ring 17, abuts with the possibility of sealing in the crest of the can. The edge flange 16 of the lid passes into a substantially cylindrical section 19 connecting the inner side 18 of the can wall of the can, in this example containing a collar 20 that is engaged with force blocking with a corresponding collar 21 in the surface of the can shell, whereby the lid is held closed position. Using a cylindrical portion, the edge of the lid forms a U-shaped groove 22 in order to lose as little volume as possible in the container, i.e. so that the cover portion 23 of the lid is positioned as high as possible with respect to the opening edge portion of the can.

Thus, for securely closing and securing the lid 3 on the can 2, the container 1 according to the invention comprises a safety ring 24 which covers the opening edge portion 6 of the can and the peripheral edge portion 15 of the lid. The safety ring is made of resilient plastic, but nonetheless possessing good dimensional stability and strength, such as thermoplastics obtained by injection molding. The safety ring 24 is formed by a fully closed, in this example round, element that is made in the locked position, as shown in FIG. 1, with the possibility of reliably holding the lid 3 in an airtight manner on the can 2 by mechanically attaching to the peripheral edges of the can and lid.

As can be seen from the drawings, the safety ring 24 is made in the form of an annular closed profile containing a substantially U-shaped portion 25, which forms an annular channel 26 open from below, in which the peripheral edges of the lid and can are enclosed. On the other side of the container 1, the U-shaped part 25 passes into an annular skirt 27, which runs continuously around the can and which on its inner wall 28 contains a safety collar 29, which, by interacting with the ledge 12 facing downward and outward, closes the safety ring 24 and, accordingly, the lid 3 on the can 2 in the locking position in accordance with FIGS. 1 and 2. More precisely, the U-shaped portion 25 comprises a flange 30 protruding downward on the inner wall of the lid, and this flange abuts against the cylindrical the first part 19 of the lid and goes up to the upper part 31, which abuts against the edge flange 16 of the lid and preferably contains a convex edge flange 32, which facilitates stacking of a plurality of containers. On the outside of the container, the outer flange 33 of the U-shaped portion 25 projects downward and closes the joint between the lid and the can. The skirt 27 extends around the can at the same distance from its body wall 5.

According to the invention, the safety ring 24 contains a weakened section 34, which is made with the possibility of tearing under the action of tensile forces that are large enough to open the container to gain access to its contents in its internal space, but in no case under the action of such forces which the container must withstand when the can is handled with its contents in a different way, i.e. when the container is in the closed locked position shown in figures 1 and 2, in accordance with the common standard. The type of requirements, in particular voltages, with which the capacitance for, for example, hazardous products must be able to cope, is defined in the standards and published, among others, in the so-called UN certificates, after the tests.

The attenuated portion 34 is shown schematically in FIG. 1, but is usually or substantially invisible to the eye. Thus, the weakened portion 34 extends along the guard ring 24, transversely or obliquely, or along an indirect line. It is completely optional in all the embodiments of the weakening that extends continuously from the lower outer edge 35 of the safety ring to its lower inner edge 36, and only in accordance with the technology for creating a weakened section and its strength, i.e. strength in the weakened section can be adjusted depending on the length of the weakened line.

In order to ensure that the necessary breaking forces are created for breaking the safety ring 24 in the weakened section 34, an engagement section 37 is provided in accordance with the invention for a breaking tool 38, for example a screwdriver, see FIG. 3. The engagement section 37 is made in the form of a protrusion directed to the side of the skirt 27 of the safety ring 24 and, in this example, is made in the form of arches or jumpers, which are open in the upper and lower direction, as an alternative, in the form of a groove open from below, which is made as integrally on the outer side of the safety ring 24 next to its lower outer edge 35, on the outer side of the skirt 27, so that there is a small space for insertion of the tool blade 41, which can be located above the handle near the outer st the outer flange 33. The engagement portion is adjacent and in the weakened portion, so that tearing forces outward and upward, see the direction of arrow 42, tool 38, create sufficiently large tensile forces so that the safety ring crackes and opens in the weakened portion 34, in as a result of which the safety ring can be removed and the lid can be removed in the usual way, for example, using a suitable tool that can be inserted between the lid and the can. Flattening of the edge may be provided in some places, which allows the tool to be inserted into the active position to raise the lid. The protrusion is located in such a way that it does not extend below the lower edge of the skirt and therefore is less noticeable.

According to a preferred embodiment, the weakened portion 34 is formed by the fact that the retaining ring 24 is injection molded into a substantially closed mold containing an annular cavity with one entry point, a gate, for liquid thermoplastics, which therefore heats up to a liquid form. As schematically illustrated in FIG. 4, by choosing a gate, see arrow 43 diametrically opposite to the position of the proposed weakened section 34, air is simultaneously removed in the weakened section, the annular shape will be filled with two simultaneous flows of liquid thermoplastics, see arrows 44, 45, which move at the same speed and, in the end, form two essentially semicircular half rings, with two front parts of the thermoplastics meeting at the location of the alleged weakened th section and converge there. Therefore, the attenuated portion 34 is practically invisible, but shown in FIGS. 1 and 4 for ease of understanding. Due to the fact that the surface of the mass has a slightly lower temperature compared to the inner part of the mass, a completely uniform fusion having the same strength as the rest of the thermoplastic is not possible, thus creating a weakened spot that forms a weakened area when the thermoplastic mass cures when reduced temperature and required holding time for full cure. The mold is made with a small channel for the formation of an arcuate meshing section.

The fact that the weakened section 34 is imperceptible and practically invisible, and the protrusion is also invisible, and that tools are required to break the safety ring 24 helps to significantly reduce the risk of, for example, spontaneous opening of the container by a child or other unauthorized person, thereby ensuring a high degree of reliability.

The invention is not limited to the examples described above and illustrated in the drawings, and may vary within the scope of the claims below. For example, the can and the lid may have a different shape, for example an oval shape or a shape containing a plurality, for example four, of corners that are rounded. The insertion of the safety ring can be carried out at different stages and can be achieved through the interaction of the conical surfaces 11 of the can 2 and the surface under the safety collar 29. The safety ring can also be made by injection molding in place. This is of interest, inter alia, when the safety ring is integral with the cover and is injection molded next to the opening edge of the cover, i.e. firmly sits on the lid until the safety ring breaks, since this ring should be easy to remove. In principle, two or more weakened sections and two or more engagement sections for a tearing tool are possible, although it is not obvious that the number of weakened sections and engagement sections is the same. For example, two or more weakened sections are formed if two or more insertion points are placed symmetrically in the form, and an appropriate number of plastic flows are formed that meet halfway and together form two or more weakened sections.

Claims (6)

1. A container in the form of a can (2) of sheet metal with a removable lid (3) of sheet metal for closing and opening a space for storing products, the container being axisymmetric about the axis of symmetry (1) and containing a base (4) in the lower part and a case wall (5) connected to it, which in the upper part contains a peripheral opening edge portion (6) defining an opening (7) of the container, which, when the lid is installed, is closed by interaction between the peripheral edge portion (15) of the lid and an opening edge portion of the can, wherein the lid is protected against accidental opening by means of an elastic plastic safety ring (24), which is made in the form of an annularly closed profile containing a substantially U-shaped part (25) forming an annular channel open from below (26) which covers the peripheral edge portion of the lid and the opening edge portion of the can and protects the lid, and by means of an annular collar (29) engages under the radially protruding portion (12) of the edge-opening about the section (6) of the can, and the opening edge section is formed by the protruding part of the housing wall (5), and this part is bent to form a radially protruding section, while the safety ring (24) contains at least one weakened section (34), configured to tear to open the container when the weakened section (34) is subjected to tensile forces exceeding the set maximum load when handling the container, and the safety ring contains an engagement section (37), laid next to the weakened area, for a tearing tool (38), to ensure by means of a swinging movement that the safety ring breaks in the weakened area, characterized in that the weakened section (34) is essentially invisible to the eye, and the engaging section (37) for the tearing tool (38) is formed by the side facing protrusion of the safety ring (24) located on the outer side of the ring under the shoulder (29) to engage the ring, and the fact that said protrusion extends side by side with the lower edge of the skirt (27) and comprises an opening, which is open at least in the lower direction. 2. A container according to claim 1, characterized in that the weakened section (34) is formed by manufacturing a safety ring (24) by injection molding in an annularly closed shape containing an insertion point for each weakened section. 3. The container according to claim 1, characterized in that the safety ring (24) is a separate element, which in the locked position is fixed with the peripheral section (6) of the lid due to its profile containing a U-shaped part (25). 4. The container according to claim 1, characterized in that the inner space is located between the inner side of the safety ring and the protruding part of the opening edge portion (6) to ensure compression of the safety ring during the breaking movement. 5. A container according to claim 1, characterized in that said protrusion is made in the form of an arcuate element (39), which is open both from above and from below. 6. A container according to claim 1, characterized in that said protrusion is directed only to the side and does not protrude below the bottom edge (35) of the skirt.

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