CONTAINER WITH A SCREW CAP

Description

Technical field

[0001] The present disclosure relates to a container, preferably a bucket with a lid, in particular made of plastic, for the transport of dangerous goods.

[0002] Containers intended for the transport of dangerous goods must meet certain requirements to be approved. These requirements include passing a drop test and an internal pressure test. In a drop test, the container is dropped from a specific height. Upon impact, the lid or closure must not open. In an internal pressure test, the sealed containers must withstand a specific internal pressure without leaking or the lid or closure detaching.

[0003] It is known to equip containers with closures consisting of a lid plate and a separate screw ring or a locking ring with a thread.

[0004] US Patent 2006 / 0091099A1 discloses a container having an inner plate that seals an opening of the container. The plate is secured with a lid that is screwed onto the container. At least one sealing element is provided between the plate and the side walls of the container. US Patents 7,611,026B1 and 9,359,117B2 also disclose containers in which a cover plate is screwed onto the container by means of a threaded lid.

[0005] DE 600 05 333 T2 and US 4 896 782 A each show bottle-shaped containers with a locking ring that fixes a lid plate, which closes a container opening, to a container rim.

[0006] From US 5,875,915 A, US 2003 / 141,271 A1, US 7,611,026 B1, US 2004 / 108,294 A1, and EP 0 323,812 A2, a container is known, comprising a lid plate, a locking ring that secures the lid plate to the container, and a sealing ring. The lid plate and the locking ring each have projections that interact when the locking ring is lifted, causing the lid plate and locking ring to be lifted together.

[0007] German patent DE 102 60 225 A1 shows a container with a reinforcing section in the lid. US patent 3,491 908 A shows a container with a locking ring that has a receiving section comprising a lid plate for the container. US patent 2011 / 049 155 A1 shows a container with a centering section on the lid, which centers another container stacked on top of the lid. US patent 5,368 182 A shows a container with a lid, the lid of which can be bolted to the container when closed.

[0008] These containers share the common flaw that their protection against unintentional opening or bursting during drop tests is insufficient. The plate placed against the container's side walls can shift or deform under high stress. Furthermore, the container's side walls themselves can deform, preventing the plate from covering the entire opening. Consequently, the container could leak or fail the drop test.

[0009] The purpose of this disclosure is therefore to overcome or at least mitigate the disadvantages of the prior art and preferably to provide a container that is particularly secure against closure. In particular, the container must not open during a drop test.

[0010] This problem is solved by a container having the features of claim 1.

[0011] The present disclosure relates to a container with a closure for sealing the container. The container can be made of plastic. Preferably, the container is in the form of a bucket. The closure or lid is multi-part and comprises a lid plate, a locking ring, and a seal or sealing ring (either separate or molded onto the lid plate). The closed, impermeable, or fluid- and / or gas-tight lid plate serves to cover the container opening and can be placed on a rim that defines the container opening. The locking ring can be placed on or over the lid plate and screwed to the container. By screwing on the locking ring, the lid plate (which is loosely placed on the container) is fixed to the container. The seal or sealing ring is positioned between the lid plate and the container rim and thus seals the container opening.

[0012] Preferably, the locking ring presses the sealing ring onto the upper edge of the container rim. This seals the transition between the container and the closure, preventing any liquid from leaking out. The sealing ring can be injection-molded or cast onto the lid plate, or it can be inserted or injection-molded into the lid plate as a molded part.

[0013] The lid plate has an edge section with a first receiving section that accommodates the container rim and surrounds it radially from the inside and outside. The first receiving section is preferably U-shaped, more precisely ∩-shaped (in the form of an inverted U).

[0014] The lid plate thus features a geometry along its (circumferential) edge that accommodates or can be placed upon the container rim. This geometry extends vertically upwards along the inside of the container rim towards the top edge and downwards along the outside towards the container base. Therefore, the edge section of the lid plate encompasses the container rim on both sides, i.e., from the inside and outside. If the container wall and / or the lid plate deforms during a drop test, this deformation does not cause the closure to detach or open from the container. Instead, the adjacent / mutually encompassing geometries and the top edge deform equally, creating a positive fit. Thus, the geometry stabilizes the container against deformation during the drop test. Due to this positive fit, the closure does not open.This means that the lid plate closing the container opening is positively connected to the container in both radial directions via the edge geometry and force-fit in the axial direction via the locking ring, which has proven to be a very strong and tight connection in various drop tests.

[0015] The cover plate further comprises a first circumferential projection or several circumferential projections which interact axially with a second circumferential projection or several circumferential projections of the locking ring. The first projection or projections of the cover plate interact with the second projection or projections of the locking ring in such a way that, when the locking ring is lifted from the container, the projections come into contact and the cover plate is lifted along with it.

[0016] On the other hand, the locking ring and lid plate have such axial play that the locking ring, for example when screwing it onto the container, can move axially by a certain amount relative to the lid plate. The first projection or projections of the lid plate extend radially outwards from the first receiving section of the lid plate. The second projection or projections of the locking ring extend radially inwards from a collar of the locking ring. When the locking ring is unscrewed and lifted, the second projection or projections of the locking ring abut axially against the first projection or projections of the lid plate. Thus, when the locking ring is lifted, the lid plate is lifted off together with the locking ring.

[0017] When the lid is lifted, the locking ring and the lid plate act as a single component. However, the protrusions interact in such a way that the lid plate and the locking ring are movable relative to each other in the circumferential direction. This means the lid plate can rotate within the locking ring. This can be advantageous because the sealing ring makes it difficult to rotate or move the lid plate on the container rim. Therefore, when opening and closing the lid, it is beneficial if the locking ring can rotate independently of the lid plate on the container rim. When closing the container opening with the lid, the lid plate with the sealing ring can first be pressed onto the container rim. The lid plate can then sit relatively firmly and immovably on the container rim. The locking ring is then screwed on relative to the lid plate. When opening the lid, the locking ring can also be screwed on relative to the lid plate.

[0018] Preferably, the locking ring and lid plate, when removed from the container, can be separated, for example, by radially elastically stretching both the locking ring and lid plate and axially passing the projections past each other, in order to, for example, clean both parts separately. That is, the locking ring and the lid plate can be (elastically) clipped together.

[0019] The locking ring has a rim section with a second receiving section. Radially within this second receiving section, the locking ring has an annular bearing surface. Within the first receiving section, the cover plate has an annular recess and a raised central section, allowing the locking ring to be positioned with its side opposite the bearing surface in the annular recess of the cover plate, so that the bearing surface of the locking ring forms a flat surface flush with the central section of the cover plate.

[0020] The locking ring can have an edge section with a second, in particular U-shaped or ∩-shaped, receiving section that receives the first receiving section of the cover plate and encompasses it radially from the inside and outside. This also results in a radial positive fit between the locking ring and the cover plate, which further increases the strength of the closure.

[0021] The locking ring has a ring-shaped contact surface radially within the second receiving section and may have multiple centering sections. This ring-shaped contact surface serves to stack an identical or compatible second container on the locking ring. The centering sections, which project radially inward from the second receiving section and are spaced circumferentially, serve to center or laterally secure an identical or compatible second container on the locking ring. The centering sections may be circular segments to accommodate the bottom of a round bucket radially within.

[0022] Within the first receiving section, the cover plate features an annular recess and a raised central section. This allows the locking ring to be positioned in the annular recess of the cover plate with its side opposite the contact surface, creating a flush, flat surface with the central section of the cover plate. In other words, the locking ring and the cover plate complement each other, forming a flat outer cover surface. More precisely, the raised central section of the cover plate corresponds to and completes a central recess in the locking ring. This positive-locking engagement of the central section of the cover plate with the central recess of the locking ring also prevents any relative radial displacement between the locking ring and the cover plate.The resulting flat surface is prepared and designed so that another container, intended for stacking on top of the first, can be placed upon it. This ensures the additional container stands upright and on a stable base. This prevents, or at least significantly reduces, the likelihood of the stack of containers tipping over. Centering sections prevent lateral slippage.

[0023] Furthermore, the stable connection between the closure and the container can also withstand high stacking loads when several containers or buckets are stacked on top of each other, especially on the lid.

[0024] Advantageous further developments of the present disclosure are the subject of the attached subclaims.

[0025] The lid plate can have a radially oriented, annular reinforcement section within the first receiving section to strengthen the radially inner part of this section. This means that the portion of the lid plate's edge section that surrounds the inner rim of the container can be reinforced. This allows the stacking load of the container stacked on top of the lid to be better supported against the container wall, transferring the stacking forces to the container wall and thus relieving stress on the lid. Furthermore, this reinforcement stabilizes the connection between the lid and the container, protecting the container against deformation during drop tests.

[0026] The reinforcement section can be designed as a circumferential, preferably V-shaped, bead with a plurality of radially extending and circumferentially spaced, preferably V-shaped, more precisely L-shaped (in the form of an inverted V), reinforcing ribs. This increases the stiffness of the cover plate, thus preventing it from being indented.

[0027] At the radially outer end of the second receiving section of the locking ring, a collar extending over the lid plate can be attached. This collar has an internal threaded section that can be screwed to an external threaded section of a collar on the container located below the container rim. Since the stacking loads or impact forces are transferred from the locking ring and the lid plate to the container via the second receiving sections, the screw connection between the locking ring and the container is located outside the force flow and is therefore relieved of stress.

[0028] The second receiving section of the sealing ring can have a circumferential ridge on the inside, more precisely inside the U-shape. When the sealing ring is screwed onto the container, this ridge presses against the first receiving section of the lid plate from the outside, indirectly pressing the sealing ring firmly against the upper edge of the container rim. This ensures that an axial force is applied to the seal precisely at the point where it is located, thus increasing the contact pressure of the seal.

[0029] The sealing ring can have a first radial step, particularly between the second receiving section and the threaded section, and the container can have a second radial step, particularly between the container rim and the threaded section. These steps come into contact with the container when the sealing ring is screwed on, i.e., they act as stops, thus limiting the tightening process. This prevents the seal from being overtightened and damaging the threaded sections, which could impair the reusability of the lid and / or container.

[0030] Alternatively, the sealing ring has a rib that projects radially inward from the ring's circumferential collar. When the sealing ring is tightened, the rib collides with a stop on the container to define the tightening endpoint. The stop is formed on the upper side wall section of the container. As the sealing ring is screwed onto the container, the rib moves axially with each turn. When the rib abuts the stop on the container, the seal is tightened. This limits the force or torque required for tightening to prevent damage.

[0031] The locking ring can have a detent geometry, and the container can have a complementary detent geometry. When the closure is fully screwed on, these components interlock positively, preventing the closure from rotating relative to the container. This positive locking mechanism prevents the closure from over-tightening in one direction and acts as an tamper-evident feature in the other. The detent geometry can be a recess, and the detent geometry on the container can be a rib or projection. Preferably, at least one of the two detent geometries is spring-loaded, for example, in the form of a spring tongue. This allows the positive locking mechanism, particularly for opening the closure, to be released by manually actuating the spring-loaded detent geometry.

[0032] The locking ring and the container can each have a through-hole that aligns when fully screwed on, allowing the locking ring and the container to be sealed with a (plug-in) seal. This serves two purposes: firstly, to detect whether the container has been opened before, and secondly, to ensure that the container remains fully closed.

[0033] The locking ring can have a further receiving section, in particular U-shaped or ∩-shaped, extending radially outside the second receiving section. This receiving section receives a circumferential rib on the collar of the container and encompasses it radially from the inside and outside. This results in (in addition to the radial positive fit between the locking ring and the lid plate) an (additional) radial positive fit between the closure and the container, which further relieves the stress on the screwed threaded sections when external loads are applied to the closure.

[0034] The sealing ring can form a first sealing point between the first receiving section and the container edge, and a second sealing point between an outer side of a container side wall and the first receiving section, which radially encompasses the container edge.

[0035] Furthermore, the locking ring can press the first receiving section, which receives the container rim and encompasses it radially from the inside and outside, against the sealing ring from the radial outside, and thus press the sealing ring against the container side wall.

[0036] This allows for the creation of two redundant sealing points, improving the sealing capacity of the closure. In particular, it prevents the sealing ring from losing contact with the closure and / or the container side wall due to deformation of either the container side wall or the closure, especially the first receiving section, thus preventing a reduction in the sealing effect of the sealing ring.

[0037] The combination of the container's external thread and the sealing ring's internal thread secures the sealing ring to the lid plate in such a way that it exerts a force on the first receiving section towards the container's edge. This force presses the first receiving section onto the first sealing point, thus creating a seal. Furthermore, the collar presses the first receiving section radially inwards when the threads are tightened. This allows the first receiving section to exert a force on the second sealing point, pressing it against the container's outer wall. Brief description of the characters

[0038] Fig. 1 shows an isometric representation of a container according to the invention with a closure; Fig. 2 shows an exploded view of the closure and the container according to the invention; Fig. 3 shows a side view of the container according to the invention with the closure; Fig. 4 shows a side view of the container according to the invention with a raised closure; Fig. 5 shows a detailed representation of a side view of the container according to the invention; Fig. 6 shows a sectional view through the container according to the invention with a sealing ring according to a first embodiment; Fig. 7 shows a sectional view through the container according to the invention with a sealing ring according to a second embodiment; Fig. 8 shows a sectional view through the container according to the invention with a sealing ring according to a third embodiment; Fig. 9 shows an isometric representation of the locking ring; Fig. 10 shows an isometric view of the open container; Fig. 11 shows a detailed side view of the closed container with the closure; Fig. 12 shows an isometric view of the closed container; and Fig. 13 shows a cross-sectional view through the container according to the invention with the closure partially open. Detailed description of the figures

[0039] Fig. 1 Figure 1 shows a container 1. The container 1 is, for example, a round plastic bucket and is closed with a lid or closure 2. The closure 2 is rotationally symmetrical and has a lid plate 4, a sealing ring 6, and a locking ring 8.

[0040] Fig. 2 Figure 1 shows an exploded view of the closure 2 and the container 1. The cover plate 4 can be placed on a container rim 10, which defines a container opening, and covers the opening. The locking ring 8 can be placed over the cover plate 4 and screwed to the container 1. The cover plate 4 can thus be fixed to the container 1 by means of the locking ring 8. The sealing ring 6 is arranged between the container rim 10 and the cover plate 4 and seals the container opening.

[0041] The cover plate 4 has an edge section with a first, in particular U-shaped, receiving section 12, which can receive the container rim 10. The first receiving section 12 encompasses the container rim 10 radially from the inside and outside. The first receiving section 12 extends vertically upwards towards the container rim 10 and extends vertically downwards outside the container 1 along a container wall. Within the first receiving section 12, the cover plate 4 has an annular reinforcing section 14. The annular reinforcing section 14 reinforces the radially inner part of the first receiving section 12 and the part of the first receiving section 12 that encompasses the container rim 10 from the inside. The reinforcing section 14 has a circumferential bead 16. The bead 16 is preferably V-shaped. The bead 16 has a plurality of reinforcing ribs 18 that extend radially and are spaced apart circumferentially.The reinforcing ribs 18 are preferably V-shaped and extend vertically upwards from the groove 16. The cover plate 4 also has a raised central section 20 in the middle.

[0042] The locking ring 8 has an edge section with a second receiving section 22. The second receiving section 22 is preferably U-shaped and can receive the first U-shaped receiving section 12 of the cover plate 4. The second receiving section 22 encompasses the first receiving section 12 radially from the inside and outside due to its U-shape. The locking ring 8 has a collar 24 at the radially outer end of the second receiving section 22, which overlaps the cover plate 4. The collar 24 projects (vertically downwards) from the second receiving section 22, projecting towards the container 1. The collar 24 has an internal threaded section 26 that can be screwed into an external threaded section 28 of a collar 30 of the container 1, which is arranged below the container rim 10.

[0043] The closure ring 8 further features an annular contact surface 32 radially within the second receiving section 22 for stacking an identical or compatible second container 1 on the closure 2. A plurality of centering sections 34 project radially inwards from the second receiving section 22. The centering sections 34 are spaced circumferentially and center the identical or compatible second container 1 on the closure 2. One side, which is axially opposite the contact surface 32, rests on the cover surface of the cover plate 4. The central section 20 of the cover plate 4 is flush with the contact surface 32 of the closure ring 8. The raised central section 20 of the cover plate 4 corresponds to a central recess in the closure ring 8 and completes it to form a common (flat) surface. Fig. 1 (shown). The cover plate 4 has a kind of depression radially outside the central section 20, in which the support surface 32 rests.

[0044] The container 1 is approximately cylindrical, has a round base, a wall 36 that projects vertically from the base, and an upper rim 10 that defines the (round) opening. The upper end of the wall 36 has a collar 30 that projects radially from the rest of the wall. The collar 30 has an external threaded section 28 for screwing the closure 2 onto the container 1. The container 1 also has a handle 38 for carrying it. The handle 38 is rotatably attached to the collar 30.

[0045] Fig. 3 Figure 1 shows a side view of the container 1. The container 1 has a locking geometry, in particular a rib / projection 40. The rib 40 is formed on an upper surface of the collar 30 of the container 1 and preferably extends vertically upwards towards the closure 2. Fig. 4 shows a side view of the open shutter 2. Here, shutter 2 is compared to... Fig. 3 The external thread section 28 of the container 1 is shown. The locking ring 8 has a detent geometry, in particular a recess 42. The detent geometry of the locking ring 8 is complementary to the detent geometry of the container 1. The rib 40 of the container 1 engages positively in the detent geometry (recess 42) of the locking ring 8 when the closure 2 is fully screwed on. This engagement prevents relative rotation of the closure 2 to the container 1, with at least one of the detent geometries being spring-elastic, thus allowing the positive locking to be released, in particular for opening the closure 2. The engagement is shown in the detailed side view of the closed container 1. Fig. 5 shown. In addition, the locking ring 8 and the container 1 each have a through-hole 44 which are aligned with each other when fully screwed on, so that the locking ring 8 and the container 1 can be sealed with a seal 46.

[0046] Fig. 6 Figure 1 shows a section of a longitudinal section through the closure 2 on the container 1. The cover plate 4 has a central section 20 extending radially outwards from the inside. Radially outwards from the central section 20, the groove 16 with the reinforcing ribs 18 adjoins the central section 20. The first receiving section 12 encompasses the container rim 10 radially inwards and outwards. The first receiving section 12 extends vertically upwards towards the container rim 10 and vertically downwards in the opposite direction outside the container 1. Thus, the first receiving section 12 extends along the container rim 10 outside the container 1. In this way, the first receiving section 12 forms a U-shape, or the shape of an inverted U.

[0047] The sealing ring 8 has a radially inward bearing surface 32, which extends radially inward from the second receiving section 22. Radially outside the bearing surface 32, the sealing ring 8 has centering elements 34. Adjoining these, the second receiving section 22 is arranged radially outward. At the radially outer end of the second receiving section 22, the sealing ring 8 has a collar 24. The internal threaded section 26 is arranged on the collar 24 and screws the sealing ring 8 to the external threaded section 28 of the container 1.

[0048] The second receiving section 22 of the sealing ring 8 has an internal circumferential bead 48 which, when the sealing ring 8 is screwed onto the container 1, presses from the outside against the first receiving section 12 of the cover plate 4 and seals the sealing ring 6 against the upper edge of the container rim 10. The bead 48 is positioned inside the second U-shaped receiving section 22 and extends vertically downwards. The sealing ring 8 also has a first radial step 50, which is located, in particular, between the second receiving section 22 and the threaded section 26. The container 1 also has a second radial step 52, which is located, in particular, between the container rim 10 and the threaded section 28. The two radial steps 50 and 52 contact each other when the sealing ring 8 is screwed onto the container 1, thus limiting the tightening process.

[0049] The cover plate 4 has a first circumferential projection 54 or several circumferential projections which engage in a form-fitting manner in the axial direction with a second circumferential projection 56 or several circumferential projections or a rib on the locking ring 8. As a result, when the locking ring 8 is lifted from the container 1, the projections 54 and 56 come into contact, and the cover plate 4 is lifted together with the locking ring 8. The locking ring 8 and the cover plate 4 have sufficient axial play to allow the locking ring 8 to move axially relative to the cover plate 4 by a certain amount, for example, when being screwed onto the container. Nevertheless, the locking ring 8 and the cover plate 4 can be separated from each other when they are removed from the container.

[0050] The locking ring 8 can also have a further receiving section, in particular a U-shaped one, radially outside the second receiving section 22, which receives a circumferential rib on the collar 30 of the container 1 and encompasses it radially from the inside and outside.

[0051] In a first embodiment, which is described in the Fig. 6 As shown, the sealing ring 6 has a semicircular cross-section. The sealing ring 6 is compressed between the first receiving section 12 and the container rim 10, thus sealing the container opening. The sealing ring 6 therefore seals between the first receiving section 12 of the cover plate 4 and the container rim 10 of the container 1.

[0052] The sealing ring 6 can take on different shapes. Fig. 7 Figure 1 shows the sealing ring 6 according to a further embodiment. In this embodiment, the sealing ring 6 extends along the edge of the container 10. This means the sealing ring 6 forms two separate sealing points. A first sealing point 60 is located at the upper end of the container's side wall. A second sealing point 62 is located on an outer wall of the container's side wall. The second sealing point 62 is spaced apart from the first sealing point 60. The two sealing points 60, 62 create an optimized seal between the closure 2 and the container 1. The two spaced-apart sealing points 60, 62 are redundant to each other to improve the sealing capacity. Should one of the sealing points 60, 62 become leaky, for example, because a plastic component such as the closure 2 or the container 1 is deformed, the other redundant sealing point seals the container opening and prevents the escape of liquids.Between the two sealing points 60, 62, the seal 6 does not rest against the container edge 10. This makes the seal 6 very flexible and allows it to adapt its shape to possible deformations of the adjacent components, such as the cover plate 4 or the container edge 10.

[0053] The second sealing point 62 is arranged on the outer wall of the container rim 10 in such a way that the second sealing point 62 is in contact with the first receiving section 12, which encompasses the container rim 10 both radially from the inside and from the outside.

[0054] Fig. 8 Figure 1 shows the sealing ring 6 according to a further embodiment. The sealing ring 6 is teardrop-shaped and extends along the outer edge of the container rim 10. This means that the sealing ring 6 forms a single large sealing point, which, however, extends along the outer edge of the container rim 10. The sealing ring 6 therefore does not form a (nearly) point-like intersection with the container rim 10, but rather an intersection line. Due to the larger contact area of ​​the sealing ring 6 on the container rim 10, the sealing effect of the sealing ring 6 can thus be improved. In this way, the sealing ring 6 ensures that no liquid can drip from the container 1. The teardrop-shaped sealing ring 6 can nevertheless still form the first sealing point 60 at the container rim and the second sealing point 62 between the outer surface of the container and the inner surface of the first receiving section 12.

[0055] The sealing ring 6 is preferably made of an elastic material. Therefore, the sealing ring 6 is flexible and can adapt to the shape of the container edge 10 and / or the first receiving section 12 even if the container edge 10 is deformed.

[0056] Fig. 9 Figure 1 shows an isometric view of the locking ring 8. The collar 24 protrudes from the base 32. The internal thread section 26 is located within the collar 24. The (spring-loaded) recess 42 is located at one end of the collar 24. The recess 42 is compressible in one (axial) direction, i.e., towards or away from the container 1. For this purpose, the recess 42 is designed, for example, as a spring tongue. By compressing it, the rib 40 and the recess 42 are no longer in mutual engagement, and the closure 2 can be screwed on. In the circumferential direction of the locking ring 8, next to the recess 42, is the opening 44 for the seal 46 (in Fig. 11 (shown) arranged.

[0057] Fig. 10 Figure 1 shows the open container 1. The majority of ribs 40 are formed on the collar 30, which projects radially outwards from the container wall 36. The ribs 40 are preferably arranged vertically. The collar 30 also has a holder 58 for the handle 38. Fig. 11 The figure shows in particular the rib 40, which engages with the recess 42. The seal 46 is pulled through the aligned openings 44 and acts as a seal. The seal allows it to be determined whether the container 1 has already been opened. Fig. 12 Figure 1 shows an isometric representation of the closed container 1. The number of ribs 40 and the number of recesses 42 are each in interaction with each other. The multiple ribs 40 are in interaction with the multiple recesses 42.

[0058] Fig. 13 Figure 1 shows the closure 2, which has been partially unscrewed from the container 1. The first projection 54 of the cover plate 4 extends radially outwards from the first receiving section 12. The second projection 56 of the closure ring 8 extends radially inwards from the collar 30. The two projections 54 and 56 interact in such a way that they both abut axially when the closure ring 8 is unscrewed. This is also shown in Fig. 13 As shown. When the locking ring 8 is lifted upwards, the projection 56 takes the cover plate 4 with it. Thus, the cover plate 4 is lifted off together with the locking ring 8. However, the cover plate 4 is movable and, in particular, rotatable in the circumferential direction relative to the locking ring 8. Reference symbol list

[0059] 1 Container 2 Closure 4 Cover plate 6 Sealing ring 8 Closure ring 10 Container rim 12 First receiving section of the cover plate 14 Reinforcing section 16 Bead 18 Reinforcing rib 20 Central section 22 Second receiving section of the closure ring 24 First collar of the closure ring 26 Internal thread section 28 External thread section 30 Second collar of the container 32 Base surface 34 Centering sections 36 Container wall 38 Handle 40 Rib 42 Recess 44 Feedthrough 46 Seal 48 Bead 50 First stage of the closure ring 52 Second stage of the container collar 54 First projection of the cover plate 56 Second projection of the closure ring 58 Bracket 60 First sealing point 62 Second sealing point

Claims

1. A container (1), in particular a plastic container, preferably in the form of a bucket, with a closure (2) for closing the container (1), comprising: a closed lid plate (4) which can be placed on a container rim (10) bordering the container opening in order to cover said container opening; a lock ring (8) that is placeable over the lid plate (4) and screwable to the container (1), by means of which the lid plate (4) can be fixed to the container (1), and a seal ring (6) arranged between the container rim (10) and the lid plate (4) for sealing the container opening, the lid plate (4) comprising a rim portion with a first, in particular U-shaped, receiving portion (12) which receives the container rim (10) and encompasses it radially from inside and outside, the lid plate (4) comprising a circumferential projection (54) or more projections provided in the circumferential direction, which interact in a form-fitting manner with a circumferential projection (56) or several projections provided in the circumferential direction of the lock ring (8) in the axial direction in such a way that, when the lock ring (8) is lifted from the container (1), the projections (54, 56) come into contact and the lid plate (4) is lifted with the lock ring, the lock ring (8) having a rim portion with a second receiving portion (22), characterized in that the lock ring (8), radially inside the second receiving portion (22), has an annular contact area (32) for stacking an identically constructed or compatible second container (1) on the closure (2), and the lock ring (8) rests with a side opposite the contact area (32) in an annular recess in the lid plate (4) on the lid surface, and the lid plate (4) has a raised central portion (20) flush with the contact area (32).

2. The container (1) according to claim 1, characterized in that the lid plate (4) has an annular reinforcement portion (14) radially inside the first receiving portion (12) for reinforcing the radially inner part of the first receiving portion (12) enclosing the container rim (10) from the inside, wherein the reinforcement portion (14) is formed in particular as a circumferential, preferably V-shaped beading (16) including a plurality of preferably V-shaped reinforcement ribs (18) extending in a radial direction and spaced apart in the circumferential direction.

3. The container (1) according to claim 1 or 2, characterized in that the lock ring (8) comprises the rim portion with the second, in particular U-shaped, receiving portion (22), which receives the first, in particular U-shaped, receiving portion (12) of the lid plate (4) and radially encloses it from inside and outside.

4. The container (1) according to claim 3, characterized in that the radially outer end of the second receiving portion (22) of the lock ring (8) is adjoined by a collar (24) that reaches over the lid plate (4) and having an internal thread portion (26) that is screwable to an external thread portion (28) of a collar (30) of the container (1) arranged below the container rim (10).

5. The container (1) according to claim 3 or 4, characterized in that the lock ring (8) has a plurality of centering portions (34) radially inside the second receiving portion (22), which protrude radially inward from the second receiving portion (22) and are spaced apart in the circumferential direction, for centering the identically constructed or compatible second container (1) on the closure (2).

6. The container (1) according to any of claims 1 to 5, characterized in that the second receiving portion (22) of the lock ring (8) has an internal circumferential bulge (48) which, when the lock ring (8) is screwed onto the container (1), presses from the outside onto the first receiving portion (12) of the lid plate (4) and presses the seal ring (6) onto the upper edge of the container rim (10) in a sealing manner.

7. The container (1) according to any of claims 1 to 6, characterized in that the lock ring (8) has a first radial step (50), in particular between the second receiving portion (22) and the thread portion (26), and the container (1) has a second radial step (52), in particular between the container rim (10) and the thread portion (28), which come into contact when the lock ring (8) is screwed onto the container (1), thus limiting the screwing process.

8. The container (1) according to any of claims 1 to 7, characterized in that the lock ring (8) has a further, in particular U-shaped, receiving portion radially outside the second receiving portion (22), which receives a circumferential rib on the collar (30) of the container (1) and radially encloses it from inside and outside.

9. The container (1) according to any of claims 1 to 8, characterized in that the lock ring (8) has a latching geometry, in particular a recess (42), and the container (1) has a complementary latching geometry, in particular a rib (40), which, when the closure (2) is fully screwed on, engage with each other in a form-fit manner and prevent relative rotation of the closure (1) with respect to the container (2), at least one of the latching geometries being spring-elastic, thereby allowing the form-fit to be released, in particular for opening the closure (2).

10. The container (1) according to any of claims 1 to 9, characterized in that the lock ring (8) and the container (1) each have a feed-through (44) which, when fully screwed together, are aligned with each other so that the lock ring (8) and the container (1) can be sealed by a seal (46).