DE4343735A1 - Lid for closing tins of paint - Google Patents

Abstract

The width (b1,b2) of the annular channel (4) enclosing the central spherical segment shaped recess (3) amounts to 20% of the radius of the lid surface (2). The base (4a) of the channel has the same height and depth as the lowest point of the recess in the centre of the lid. The channel inner vertical flank (4d,4f) slopes between 0 and 45 degrees inwards from the vertical. An annular saddle (3a) between the inner recess and the rim side of the channel rests especially on the lid edge flange (6). A support clamp (20) is removably inserted into the channel. The outer channel flank (4b) has a narrow inward-pointing deformation (4c) on the top of the flank. The outer flank has an inward pointing deformation (4e) in the bottom.

Description

The invention is concerned with a reclosable cover made of metal. It is particularly concerned with stability this metal lid (press-in lid; ED) and such containers (ED containers) consisting of a metal lid and container: On The entire container should not fall open or open Leakage of the container. Such resealable Containers relate in particular to the chemical-technical area and there those container contents that reliably prevent leakage must be protected, such as paints, varnishes or stains.

The lid seat is of particular concern in the prior art such packaging, which acts as a weak point in the event of a fall of the container mostly gives way under the formation of a nose on the core wall, often even completely loosened when the lid is impacted and hitting the liquid column on the The inside of the mirror is pushed out of its seat. For this there are norms that stipulate which distance Containers must be able to fall down without hitting a leak.

(One) task is therefore the vulnerability "cover seat" to eliminate and provide such a lid, a secure closing and falling behavior in accordance with standards has without the container closed with the lid Leak strikes and without being forced to thicker sheets and / or reinforced outer packaging to achieve the standard values to use.

This is achieved with the invention described here, the supporting features are included in claim 1. Concretizations the invention can be found in the dependent claims 2 to 13. In addition, a lid embossing device (claim 14) proposed the lid mirror of a lid like this changed / reshaped that he - used in the cover ring or Container body - the desired tightness of the lid seat despite mechanical stress. A procedure for Changing the shape (claim 15) produces a lid, the  technical features are specified in claim 1 or with a device according to Claim 14 is contourable.

An important idea of the invention is to use the lid mirror a central recess and around the edge Depression to provide an annular trench (claim 1). In other words, is between an annular (outer) trench and inner recess a (raised) ring saddle (Claim 8) provided in the cover mirror.

The depression has a steadily increasing slope towards the outside, the near the annular outer trench in the annular Saddle opens. The ring saddle can also be used as a ring area be designed if it is not designed with sharp edges, but is so curved that an edgeless (steady but nevertheless sharp) transition from the slope of the depression to the falling flank of the trench. Annular saddle and the outer annular trench form the highest or lowest point in the cross-section of the cover mirror. He can be maximum (claim 13) if it corresponds to the lid height.

With the recess, which can be designed as a spherical cap, the invention achieves significant amplification and Stabilization of the lid seat. The lid remains light to close and easy to open and the manufacturing (Additional) effort is kept within reasonable limits.

The shape of the depression can be a spherical cap (claim 3, Claim 4). With the calotte the invention means one spherical segment-like cross-sectional shape between middle low point and ring-shaped overhead saddle; close to the low point the calotte also has a noticeably flattened cross-section exhibit. The middle low point - or the flattened area around the middle low point - can be at the level of the bottom of the ring-shaped trench, it can also be slightly above or are slightly below the trench floor level (claim 13).  

With the introduction of the dome-shaped interior into the Lid mirror of the press-in lid and upwards Relocation of this dome area with retention of one The invention creates the circumferential trench around the calotte Possibility of target deformation. This target deformation allows a deformation of the inward-facing calotte area. The mechanical deformation of the calotte area from the inside to the bottom the outside is energy consuming with regard to the against Inside of viscous and heavy contents (Paint, varnish, etc.) and thereby prevents the core wall from becoming relative position to the container-fixed, with the core wall Ring wall forming the cover seat (on the lower part of the container or on Cover ring), changed. The insertion of the calotte and the Retaining the trench, between which one is upward directed inner trench flank is arranged, which from the Vertical can be slightly inclined, allowing both the mechanical deformation of the limited calotte area and at the same time the decoupling of this mechanical deformation from the outer core wall of the Press-in cover. This decoupling offers the inner vertical Flank flank, since they did not allow any of those with the invention mechanical deformations of the dome area radially outwards forwards. This philosophy of the Invention when you hit the by the case with plan content provided with kinetic energy against a considered non-contoured lid mirror, in which a mechanical deformation of the cover mirror - no matter how slight - a change in the position of the outer vertical Core wall and thus the formation of "bag corners" in the Cover seat of a normal lid when the container falls Content cannot be avoided. In the invention, this is through the possible target deformation and the mentioned Decoupling of the target deformation from the core wall is no longer the Case.  

The kinetic energy of the impacting liquid into one plastic deformation of the dome area to implement it of the invention to maintain the sheet thickness of conventional containers and at the same time to achieve a higher drop stability. So plate thicknesses of 0.22 mm can still be used with the usual design of the cover mirror one Push-in cover would no longer suffice. There will also be costs also saved in terms of packaging, since a majority, e.g. B. four of containers can be packed in a box, which does not have to have increased stability.

The "additional effort" mentioned above when contouring the Lid level is more than compensated for by the significant benefits of keeping previous or current Standard sheet thickness, keeping normal outer packaging and nevertheless the fulfillment of stricter standards regarding Fall stability.

In the annular trench, which has an inner trench wall and an outer trench flank (core wall), wherein the inner trench flank can be inclined between 0 ° and approximately 45 ° from the vertical and the outer trench flank is essentially vertical - parallel to the container and lid axis 100 - runs, a support bracket can be inserted ready for transport (claims 9 to 11). The bracket can be an incomplete ring, it has a circumferential extent of about 270 ° to 350 ° and is bent or angled at its ends so that it fits comfortably in the trench. With its angled ends, it can be hooked into carrier lugs or ball eyelets on the container to simplify handling of the container.

The trench can have a dimension that is advantageously approximately 20% of the radius of the cover mirror is (claim 2). He can in its outer flank should be shaped so that at least there one, but preferably two circumferential, inward-facing Deformations - especially beads - are provided between them the bracket is kept transportable and with which one  Possibility of stacking the push-in lid as well as the cheap one Installation possibility created for a sealing ring be (claim 12).

One of these inward deformations is advantageous at the upper end of the vertical flank of the trench arranged and then borders directly on the lid level aligned flange that carries a seal. Of the Edge flange of the cover lies on a corresponding one Counter flange of the container, usually a cover ring. The inward-facing circumferential deformations can from the outside Take up the inner edge of the ring sealing element (claim 12). When Deformations lend themselves to beads. One of the mentioned Deformation can be used as a stacking bead for the molded lid be used.

In addition to the lid according to the invention, a device is also closed proposed its manufacture (claim 14), the one Lid mirror deformed with pulling blocks so that it has a receives edge-side trough, the inside of a high lying Ring saddle adjoins, which is constantly in a central low point transforms. The central depression (from saddle to low point) can be dome-shaped. The low point can be about the level that the edge-side trough at the lowest point, the Muldengrund, has.

The process for deforming the lid mirror works with conventional lids that deformed it so that the lid mirror receives the shape described above and in the calotte area a target deformation is made possible (mechanical plastic Deformation) that is not on the lid seat on the core wall of the cover transfers. So with the procedure conventional lids changed so that despite the same (conventional) sheet thickness meets the increased requirements for Fall stability of the containers closed with them become.

Two embodiments are intended to help understand the invention deepen.

Fig. 1 shows a cross section through an inventive cover, left and right sides, two different embodiments are shown. The central axis 100 is shown , which is the vertical center axis of the container 10 and the lid 1 .

FIG. 2 shows a top view of the left-hand embodiment of FIG. 1.

Fig. 3 shows a clear representation of the left-hand example of Fig. 1 with a cover ring 5 , the vertical inner wall 5 a cooperates with the core wall 4 b of the push-in cover 1 to form the cover seat. In Fig. 3, the forces P are clearly shown, which are exerted by the sloshing up content of the container on the inner surface of the lid mirror. They cause the target deformation to be explained later.

Fig. 1 shows in a representation in cross-section two embodiments of the invention; 100, f differ left of the central axis, an embodiment having almost a rectangular or square groove 4 and to the right from the center axis 100 of an embodiment having a trapezoidal trench 4, wherein the two trenches d on the one hand by its inner grave wall 4 4, which has a different inclination and on the other hand by circumferential beads 4 b, 4 e in the outer trench wall 4 b. The inner trench wall 4 f in FIG. 3 is slightly inclined relative to the left example of FIG. 1, namely at an angle of approximately 10 ° from the vertical of the lid axis 100 .

First, an overview of the cross-section. The upper ends of a container 10 are indicated, on the left side the inner end region of a cover ring 5 , on the right side a double fold 10 a, which consists of three sheet metal layers at the lower end and two sheet metal layers at the upper end and can be flattened separately at the top. Fig. 3 illustrates the cover ring version.

On the upper sides (upper edges) of the cover ring or container body 10 there is a horizontally oriented edge flange 6 , which holds a circumferential sealing element 30 in firm engagement. The edge flange 6 merges into a core wall 4 b, which runs essentially parallel to the central axis 100 of the lid 2 and container 10 . The lid mirror 2 begins at the lower edge of the core wall 4 b.

The lid surface 2, has its outer grave wall, the chuck wall 4 is b in the embodiments, a particular contour which is marked by a central dome-shaped recess 3 and an edge-side, extending around the dome-shaped recess 3 vessel 4, which is a Ring trench. The term “spherical cap” means an essentially spherical segment shape, but it can also be flattened around the middle low point. A characteristic of the spherical shape according to the invention in the center of the cover mirror is an outward or continuously increasing slope. It is also characteristic of the spherical cap according to the invention that it runs essentially symmetrically about the central axis 100 .

At the outer edge of the calotte an annular saddle 3 a is provided, which leads into the annular trench 4 . It has a small radial dimension. An example of the ratio of trench width 4 a - referred to in the examples with b₁ and b₂ - is 20% of the lid mirror radius r. The dome 3 thus takes up the majority of the surface area of the cover mirror, and the trench 4 takes up a comparatively small but noticeable radial space. In contrast, the radial dimension of the saddle 3 a is small.

The extent of the cover in the vertical direction (along the central axis 100 ) runs from the height of the ring saddle 3 a to the depth of the ring trench 4 (trench bottom 4 a) or from the height of the edge flange 6 to the depth of the ring trench 4 . These dimensions can be changed, but the best results are achieved if the ring saddle 3 a is located approximately at the same height as the edge flange 6 and the central low point of the cover mirror cap 3 is arranged approximately at the level of the trench bottom 4 a; the latter also applies to a flattened depression if the center point of the cover mirror is not in a spherical segment, but rather represents a flattened area. Then the flattened area is arranged approximately at the same height as the trench bottom 4 a and the low point becomes a low area.

In the trench 4 , which in the left embodiment of FIG. 1 is composed of trench floor 4 a, radially outer core wall 4 b (outer trench wall) and radially inner sheet pile wall 4 f (radially inner trench wall) and which in the right exemplary embodiment is composed of the trench floor 4 a, the inner trench wall 4 d and the outer trench wall 4 b is an incomplete ring, which has a radial extension of 270 ° to 330 ° and is bent at its ends by about 180 ° backwards. The bends 21 and 22 are designed so that they receive a radial dimension that corresponds to the trench width b₁ / b₂, which can be different for the two exemplary embodiments shown in FIG. 1. The bends are hooked into side flaps or ball eyelets fixed to the container after removal of the carrying bracket 20 in order to facilitate the use of the container.

In the right-hand embodiment of FIG. 1, the upper bead 4 c (holding bead) is advantageously used to give the circumferential seal 30 an additional internal hold. For this purpose, the circumferential bead 4 c is provided at the upper end of the outer trench wall 4 b, the inwardly shaped bead 4 c and the collar 6 a provided on the outer edge of the flange 6 are aligned in the horizontal direction. The seal 30 is held or clamped on both sides between the two. In the right-hand exemplary embodiment, an inwardly shaped shoulder 4 e used as a stack bead is additionally present as the second deformation. The core wall 4 b merges at its lower end over the stack bead 4 c into the horizontally running trench floor 4 a. The inner trench flank 4 d has an inclination from the vertical. It can have manufacturing advantages if you want to avoid a too sharp contour when stamping the lid contour, as shown in the left embodiment of FIG. 1 with the wall 4 f. An angle of approximately 35 ° to 40 ° is shown; a larger angle should be avoided since the linear region of this flank 4 d does not provide stability, but which has a continuous gradient variation of the spherical region 3 .

In the left-hand embodiment of Fig. 1, the circumferential upper (first) bead 4 c is provided, which extends radially inwards and is not arranged at the upper edge of the edge flange 6 but somewhat lower. A second inwardly shaped bead 4 e is provided below the first bead 4 c, in the exemplary embodiment it is located as a lower shoulder 4 c at the lower end of the outer trench wall 4 b (stack bead) between the two surrounding beads, which can also be interrupted. the support bracket 20 is secured in the axial direction against slipping out of the trench 4 . The arrangement of the annular seal 30 is also shown , which is held on the outside by the outer collar 6 a, but is not fixed in more detail on the inside.

It goes without saying that the slope of the inner trench wall, the arrangement and number of beads and the one-sided or double-sided clamping of the seal can be combined anew for a third exemplary embodiment. This is shown, for example, in FIG. 3 at an angle of approximately 10 ° of the inner trench wall 4 f with respect to the axis 100 .

Is illustrated the cover ring 5 of the left side of Figure 1 embodiment in Fig 3. The essential for the tightness point -.. The lid seat - is located between the core wall 4 b of the press-in 1 and the inner vertical wall 5a of the lid ring 5. This area must cooperate positively and positively and guarantee tightness over the longest possible axial direction. After the vertical inner wall 5 a of the cover ring 5 must be rolled or rolled backwards at the end in order to avoid injuries on free-standing edges, there is a point of attack here for the viscous liquid of the container which strikes upwards due to a fall. One arrow P illustrates this. The kinetic energy squeezes between the two vertical walls. In addition, the kinetic energy acts on the cover mirror 2 , so that channels or entire areas in the axial direction between the two vertical walls 4 b, 5 a arise in the case of an uncontoured cover, causing the container to leak. The design of the cover mirror with the circumferential trench 4 , the inside adjoining saddle 3 a and the dome 3 pointing downward stabilizes the cover mirror and opens up the possibility of allowing deformations in the dome region 3 (target deformation) that do not affect the critical cover seat 4 b described , 5 a are transmitted.

In addition to the stabilization and consolidation of the cover seat 4 b, 5 a, a tension ring or locking ring 40 can be provided, which engages over the cover ring area 5 and a first leg (apron) pointing into the trench and one over the edge fold (between the body 10 and Cover ring 5 ) reaching second leg, which may have an upward curl or curl 40 a at its end, which is pressed (clinched) on and under the fold by means of an upsetting tool in direction F. With this ring 40 , radial and axial forces are transmitted to the cover seat, so that, in addition to the central deformation and the decoupling, an edge-side clamping of the cover seat is also possible.

Last but not least, the process with which the contour of the lid can be designed should also be mentioned. For this purpose, it can be assumed that there is a customary cover 1 , which in one, two or three stages - which can be combined or carried out separately in succession - forms the new contour from a combined circumferential trench region 4 and an inner calotte 3 . The circumferential bead 4 c, possibly also 4 e, is advantageously rolled or dipped in according to the previously mentioned forming process.

Claims (17)

1. Lid for repeatable and safe - fall-stable - closing of paint containers ( 10 ), in which a cover mirror ( 2 ) has a central recess ( 3 ) which is oriented towards the container body ( 10 ) and is surrounded by an annular trench ( 4 ). 2. Lid according to claim 1, in which the trench width (b₁, b₂) about 20% of the lid level Radius (r) is. 3. Lid according to one of the preceding claims, wherein the recess ( 3 ) has a spherical segment shape - calotte ( 3 ). 4. Lid according to one of claims 1 to 3, wherein the recess ( 3 ) has a centrally flattened spherical segment-like shape - dome ( 3 ). 5. Lid according to one of the preceding claims, in which the bottom ( 4 a) of the trench ( 4 ) is at approximately the same depth / height as the low point of the lid-centered depression ( 3 ), in particular spherical cap. Claim 3 or 4. 6. Lid according to one of the preceding claims, wherein the inner trench vertical flank ( 4 d, 4 f) is inclined between 0 ° and 45 ° from the vertical inwards. 7. Lid according to claim 6, wherein the inner trench vertical flank ( 4 d, 4 f) relative to the vertical lid axis ( 100 ) takes an angle of approximately 10 °. 8. Lid according to one of the preceding claims, in which in the lid mirror ( 2 ) between the inner recess ( 3 ) and edge-side trench ( 4 ) an annular saddle ( 3 a) is provided, in particular approximately at the level of the edge flange ( 6 ) of the Cover ( 1 ) is. 9. Lid according to one of the preceding claims, in which a support bracket ( 20 ) in the trench ( 4 ) is removably inserted. 10. Lid according to one of the preceding claims, wherein the outer trench flank ( 4 b) has a narrow inward deformation ( 4 c), which is arranged in the upper region - in particular at the upper end - of the trench flank ( 4 b). 11. Lid according to one of the preceding claims, wherein the outer trench flank ( 4 b) has a (further) inward-pointing deformation ( 4 e), which is arranged in the lower region of the trench flank ( 4 b). 12. Lid according to claim 10, 11, wherein

• (a) the greatest possible distance in the vertical direction between the deformations ( 4 c, 4 e) is provided; and or
• (b) one or both deformations ( 4 c, 4 e) are continuous all around; and or
• (c) an edge flange ( 6 ) extending transversely to the central axis ( 100 ) of the cover ( 2 ) or container ( 10 ) is arranged at the upper end of the vertical trench flank ( 4 b) and protrudes outwards, with a retaining collar at its outer end ( 6 a) and at its inner end has the inward-pointing (first) deformation ( 4 b) in order to fix a (ring-shaped) sealing strip ( 30 ) between them in a stable and long-term manner.

13. Lid according to claim 7, in which

• - The ring-shaped saddle ( 3 a) and the outer edge flange ( 6 ) are at approximately the same height;
• - The central low point of the recess ( 3 ) and the bottom ( 4 a) of the trench ( 4 ) are at approximately the same height;
• - The difference between the two height dimensions determines the vertical height of the lid ( 2 ).

14. Lid embossing device for changing the contour ( 3 , 3 a, 4 a, 4 f, 4 d) of the cover mirror ( 2 ) of a reusable cover made of metal, in which a stamp-counter-stamp arrangement contours the cover mirror ( 2 ) so

• (a) that the bottom ( 4 a) of a rim ( 4 ) running around the edge essentially remains at the previous level of the lid level;
• (b) that a - radially on the inside ( 4 d, 4 f) adjacent to the trough ( 4 ) - upwardly displaced ring saddle ( 3 a) is formed;
• (c) that a central recess (3) is formed, which centrally has about the previous level of the lid surface and extending outwardly radially to / above the ring-caliper (3 a) through.

15. A method for changing the shape of the cover mirror ( 2 ) of a metal push-in cover which is customary, in which the cover mirror ( 2 ) is pulled up in an inner region ( 3 a) relative to the remaining region ( 4 , 4 a, 4 d, 4 f) becomes. 16. The method according to claim 15, in which an annular region of the cover mirror ( 2 ) is pulled up as the inner region ( 3 a). 17. The method according to claim 15 or claim 16, wherein the center ( 3 ) of the cover mirror ( 2 ) is not raised.