EP1167222B1 - Container with annular rim and method of manufacture - Google Patents

Abstract

The metal container has a spiral-form bordering (14) on the mouth side edge of the body (2). The edge bordering has a rectilinear locating section(18) for fitting of a clamping ring (10), and a support section (22) which extends at right angles to the center region of the inner side of the locating section. The edge bordering has an angle of wrap of more than 450 degrees, and preferably 510 degrees. The container in the region (a) of the edge bordering is tapered inwards so that the outside diameter of the fixed clamping ring is smaller than or as large as the maximum outside diameter of the body of the container. An Independent claim is included for a procedure for the manufacture of a spiral-form edge bordering on a metal container by the inwards directed movement of a forming tool which has a negative form.

Description

The present invention relates to a container made of sheet metal with a Randbordierung according to the preamble of the claim. Furthermore, the invention relates to a method for producing the Randbordierung Such a container according to the preamble of claim 9.

A container which can be closed with a lid is known from EP 0 565 762 A1. The opening-side edge of the container made of sheet metal has a Randbordierungmit a wrap angle of at least 360 °, with a Anlageabschnitt is provided, on which the clamping ring of the container is supported. The Randbordierung also has a support portion, on the one hand to the inside of the Randbordierung and on the other hand on the inside of the contact section supported.

DE 9 207 856 U describes a lidded drum made of sheet steel, which has an opening side Randbordierung has. To a particularly high tightness of the To ensure lidded kegs is the Randbordierung in the form of a double-tube Rollbordur educated. Furthermore, the lidded barrel in an opening side Area a smaller diameter than in another area on, whereby however in the range of the Randbordierung the largest diameter is available.

Similar containers are also known from the document US-3,448,891 and DE 37 14 890 A1, whose edge borders also have a support section, on the one hand on the inside of Randbordierung and on the other hand supported on the inside of the contact section.

From DE 42 08 807 C2 is also a container with a Randbordierung known, the support section is between the insides of Randbordierung extends, however, there is no support of the plant section.

From DE 297 22 728 U a method (according to the preamble of claim 9) and a container made of sheet metal (according to the preamble of claim 1) is known, the opening side Randbordierung a substantially trapezoidal cross-section with has two side sections and two parallel sections. The lower side section forms a contact section for the clamping ring and is over a Joint at which the clamping ring is not applied, with a parallel section connected . The Randbordierung further includes an end portion, the on the one hand, within the margins and, on the other, at the junction supported. As in the prior art described above DE 42 08 807 C2 does not support the lower side portion, on the clamping ring is applied.

From US-2,327,456 it is also known, the edges or edges of a To fold container to increase their rigidity.

In the known containers, there is a risk that the Randbordierung too heavy load, especially when building an internal pressure deformed and thus the Leakage is lost.

The invention is therefore based on the object to provide a container whose Randbordierung not be deformed even under heavy mechanical stress so that there is no danger of leakage.

The object is achieved by the features specified in claim 1. The features of the method according to the invention are specified in claim 9. Advantageous embodiments are the subject of the dependent claims.

The lockable container of sheet metal according to the invention comprises a container body, a lid and a clamping ring. The container body has an opening side Edge with a spiral edging on. The lid is made by means of a clamping ring pressed with the interposition of a sealing element against the Randbordierung, so that the container is sealed. The clamping ring can be of conventional design a U-shaped cross-section, wherein the opening of the U-shaped cross-section in Radial direction points inwards, so that the parts to be clamped enclosed at the edge become.

The Randbordierung has a contact portion for conditioning the clamping ring, so that the force can be transmitted from the clamping ring to the Randbordierung. The Randbordierung also has a support section. The support section is supported on the one hand on an inner side of the Randbordierung and on the other hand runs in one right angle to the inside of the plant section too. The support section thus has the function of a reinforcing rib.

The container according to the invention has the advantage that the contact section through the Supporting section is supported, so that the introduced over the contact section force is received by the support section. The support section extends in the direction of Surface normals of the contact section and thus in the direction of the resulting force.

As a result, a deformation of the Randbordierung with the associated Loss of contact force prevented. The lid of the container therefore includes itself strong external mechanical load or strong internal pressure tight.

In an advantageous embodiment of the container according to the invention extends the support portion to a central region of the inside of the abutment portion. With This arrangement of the support section are all areas of the contact section relative close to the point of application of the support section, so that all areas of the contact section are sufficiently protected against deformation.

In a further advantageous embodiment of the container according to the invention is the Investment section formed in a straight line, wherein the term is rectilinear on the Cross-section refers. The rectilinear design of the contact section allows a simple lateral sliding of the clamping ring and a flat system of the same at the plant section. Due to the flat system, the contact pressure is even transferred to the investment section.

The Randbordierung preferably has a wrap angle of more than 450 ° on. From a wrap angle of 450 ° is an inclination of the contact section achieved with respect to the container wall, so that the clamping ring the Randbordierung can engage in the area of the investment section. The wrap angle is preferably 510 °, so that the angle between the rectilinear contact portion and the lateral container wall is 120 °.

Advantageously, the container body is retracted in the region of the edge bordering. The container body thus has a smaller diameter in the region of the edge bordering as in a lower area, so that the outer diameter of the attached Clamping ring smaller than or as large as the maximum outer diameter of the container body is in the lower area. This embodiment has the advantage that the Container does not hit first with the tension ring on the ground when overturning, whereby damage is avoided.

In a further preferred embodiment of the container according to the invention is the Lid cup-shaped, wherein the edge of the lid with a radially to provided on the outside extending crimp, which has a wrap angle of 180 ° having. The circular circle-shaped flanging can be on the edge flanging of the container body rest while the bottom of the cup-shaped lid in the opening of the container body protrudes.

For sealing the container, the sealing element is preferably within the flange arranged. Under a sealing element are conventional annular sealing elements or free-blown seals, e.g. PU or PVC gaskets, to understand which seal the container body along the entire Randbordierung.

The clamping ring may have an abutment element which preferably adjoins the container body supported flat, so that when clamping the clamping ring only a defined contact pressure can be exercised on the margins.

The inventive method for producing a container with Randbordierung comprises the process steps of producing a helical Vorbordierung on Edge of the container body and the deformation of the Vorbordierung by a radially to inwardly directed movement of a mold having a negative mold, the Production of marginal edging. The negative mold has a lower substantially straight-line mold section for forming the contact section of the edge trim. The Vorbordierung can for example by means of rolling or upsetting be carried out in each case in several steps. The Forming tool surrounds the Vorbordierung and is moved radially against them, the Vorbordierung passes through the movement of the mold in its negative form, so that at Vorbordierung is deformed at a correspondingly high contact pressure. The inventive method has the advantage that to obtain the final form of Randbordierung only one step is necessary.

In an advantageous embodiment of the method according to the invention is Forming tool further moves radially inward after deforming the pre-bord so that the diameter of the container body decreases in an upper area becomes. Thus, the diameter of the container in the area of Randbordierung in be reduced in the same step, in which the final shaping of the Edge edging is done, which increases productivity.

The diameter of the container body is preferably so in an upper area reduces the outer diameter of the Randbordierung smaller than the maximum Outer diameter of the container body is in a lower area.

In the following the invention with reference to embodiments with reference explained in more detail on the attached figures.

Fig. 1

eine Seitenansicht des erfindungsgemäßen Behälters in einer ersten Ausführungsform,

Fig. 2

eine Seitenansicht des erfindungsgemäßen Behälters in einer zweiten Ausführungsform,

Fig. 3

den Ausschnitt A von Fig. 1 in geschnittener Darstellung,

Fig. 4

den Ausschnitt B von Fig. 2 in geschnittener Darstellung und

Fig. 5a bis 5f

eine schematische Dastellung des erfindungsgemäßen Verfahrens zur Herstellung der Randbordierung des erfindungsgemäßen Behälters.

Show it:

Fig. 1

a side view of the container according to the invention in a first embodiment,

Fig. 2

a side view of the container according to the invention in a second embodiment,

Fig. 3

the section A of Fig. 1 in a sectional view,

Fig. 4

the detail B of Fig. 2 in a sectional view and

Fig. 5a to 5f

a schematic Dastellung the inventive method for producing the Randbordierung of the container according to the invention.

FIG. 1 shows a side view of the container in a first embodiment, and FIG. 2 shows a side view of the container in a second embodiment. The containers have a container body 2 and 2 ', which is bucket-shaped. The container body 2 and 2 'are closed on the opening side of a cover 4, the only is shown in dashed lines. The lid 4 is cup-shaped and so on the container body 2 and 2 'placed, that the lid 4 with the lid bottom 6 in the container body 2 and 2 'protrudes. The edge of the cup-shaped lid 4 is with a radially outwardly extending flange 8, which provides a wrap angle of 180 °. The halbkreisfömige in cross section curl 8 is located on the edge (not shown) of the container body 2 and 2 'on. The lid 8 is pressed by means of a circular clamping ring 10 on the container body 2 and 2 '. The clamping ring 10 surrounds the flange 8 of the lid and the edge (not shown) of the container body 2 and 2 ', wherein the clamping ring 10 can be solved to to remove the lid 4. The clamping ring 10 has a contact element surrounding the container 12, in the clamped state of the clamping ring 10 on the sides of the container body 2 and 2 'rests around its entire circumference.

The two container bodies 2 and 2 'are different in that the container body 2' of the second embodiment (FIG. 2) is formed cylindrically with a uniform diameter, whereas the container body 2 of the first embodiment (FIG. 1) is in an upper one facing the lid 4 Area a has a diameter d ₁ , which is smaller than a diameter d ₃ in a lower portion b of the container body 2. The container is retracted in such a way that the outer diameter d _{2 of} the fixed clamping ring 10 is smaller than the diameter d ₃ in the lower region b of the beads or optionally the rabbet connection of the container body 2.

FIGS. 3 and 4 show the detail A of FIG. 1 and the detail B of FIG. 2, respectively in a cutaway view. The container body 2 or 2 'has an opening side Edge with a spiral Randbordierung 14 on. The Randbordierung 14 includes a first portion 16, a contact portion 18, a second portion 20 and a support portion 22. The first portion 16 of the Randbordierung 14 extends radially outward with a wrap angle of about 180 ° and goes into the contact section 18 over. The contact section 18 is rectilinear and extends radially obliquely inwardly, wherein between the abutment portion 18 and the side of the container body 2 and 2 'an angle α of about 120 ° is formed. The investment section goes into the second section 20, which in turn is curved and extends to a region c in which the second portion 20 is the inside the first portion 16 of the Randbordierung 14 touched. In area c, the second one goes Section 20 in the support section 22 over, extending up to a central region of Inside the abutment portion 18 of the Randbordierung 14 extends, wherein the support portion 22 at a substantially right angle to the inside of the abutment portion 18 runs. The wrap angle of Randbordierung 14 is thus total 510 °. The inside of the contact portion 18 facing the region of Support section 22 is formed substantially straight.

The clamping ring 10 has a substantially U-shaped cross section, the first Leg 24, the flange 8 of the lid 4 overlaps and the second leg 26 the Randbordierung 14 of the container body 2 and 2 'engages under. The inside of the second Leg 26 abuts flat against the abutment portion 18 of Randbordierung 14, wherein the pressure applied by the attachment of the clamping ring 10 pressure evenly the contact portion 18 is distributed, which by the perpendicular arrangement of the support section 22 is supported in an ideal manner relative to the area c. Thus, one is high stability of the edge trim 14 ensures what ultimately leads to greater safety concerning the tightness of the container. FIGS. 3 and 4 further illustrate that the contact element 12 bears flat against the side of the container body 2 or 2 ' and thus by the tensioning of the clamping ring 10 laterally on the container body 2 and 2 'applied pressure is reduced by a larger contact surface. Indeed It should be noted that a contact element 12 is not in both embodiments is mandatory.

In the flange 8, a sealing element 28 is provided, which in the present embodiments is formed by a foamed in the crimp sealant. At the Bracing the lid 4 with the container body 2 or 2 'is the sealing element 28th against the outside of the first portion 16 of the Randbordierung the container body. 2 or 2 'pressed and deforms elastically.

FIGS. 5a to 5f show a schematic representation of the method according to the invention for producing the Randbordierung of the container according to the invention.

FIGS. 5a and 5b illustrate the steps for producing a spiral Vorbordierung on the edge of the container body 2, wherein either a compression method or a rolling process is used.

In the upsetting process, a compression tool 30 is used. The one-piece Upset tool 30 has a first cylindrical portion 32 whose diameter the inner diameter of the container body 2 corresponds. Furthermore, the upsetting tool 30 a second substantially cylindrical portion 34 which, in the feed direction is disposed behind the first cylindrical portion 32 and a larger one Diameter than the first cylindrical portion 32 has. Both cylindrical Sections 32, 34 are arranged coaxially. On the container body 2 facing Side of the second cylindrical portion 34 is a semi-circular in cross-section Groove 36 is provided which surrounds the first cylindrical portion 32 in a circle.

In a first step (FIG. 5 a), the upsetting tool 30 is open against the opening side pressed the container body 2, wherein the first cylindrical portion 32 in the interior of the Container body 2 is advanced. During advancement, the edge of the Container body 2 to the semi-circular groove 36 and is on further advancing deformed along the groove 36. The upsetting tool is advanced so far until the Vorbordierung 38 has a wrap angle of 270 °. In a second step (Fig. 5b), a second compression tool 30 'is used, which is similar to the first Upset tool 30 a first cylindrical portion 32 ', a second cylindrical Section 34 'and a groove 36', wherein the groove 36 'of the second compression tool 32 'has a larger radius than the groove 36 in cross-section. The second compression tool 30 'is advanced like the first upsetting tool 30 until the prebieration 38 has a wrap angle of 510 °.

In the rolling process, which is alternatively shown in FIGS. 5a and 5b, several come Rollers 40, 40 'used, which roll on the edge of the container body 2, wherein in the rollers 40, 40 'in cross-section semicircular circumferential grooves 42, 42' is provided are. During the rolling of the rollers 40, 40 'on the edge of the container body 2 becomes in the direction of the arrow exerted a force on the edge, which extends along the grooves 40, 40 'deformed. As with the compression method, two work steps are performed (FIGS. 5a and 5b), wherein the roller 40 'used in the second working step has a groove 42'. having in cross-section a larger radius than the groove 42 in the first roller 40th Has.

FIGS. 5c to 5f illustrate the second method step of the invention Method for producing the marginal bordering by deforming the pre-bordering. In this process step, a mold 44 is used, which is the Vorbordierung 38 of the container body 2 annularly surrounds. The mold 44 includes a plurality of ring segments 46, which each have a gap 48 before deformation spaced apart from each other. The mold 44 points to one of the Vorbordierung 38 facing a negative mold 50, which has a lower substantially rectilinear Mold section 52 for forming the contact portion of the Randbordierung comprises.

To support the container body is first a cylindrical support tool 53rd with a desired inner diameter d of the container in the region of the edge edging corresponding outer diameter d inserted into the container. The mold 44 or its individual ring segments 46 are moved radially inwards. By this movement passes the Vorbordierung in the negative mold 52 of the mold 44, so that the Vorbordierung 38 at a correspondingly high contact pressure corresponding to Forming the negative mold 52 is deformed (Fig. 5d to 5e). The thus produced Randbordierung 14 has the contact portion 18, wherein the support portion 22 in a right angle to the inside of the contact section 18 tapers. The invention Method has the advantage that to obtain the final shape (Fig. 5e) of Randbordierung 14 only one step is necessary.

After the Randbordierung 14 is made, the individual ring segments 46 of the mold 44 are further moved radially inward. This is therefore possible because the gaps 48 between the ring segments 48 by the previous radial Shifting were scaled down, but not yet closed. While This retraction operation is again a support tool 53 'centered from above in the Inserted container whose outer diameter of the desired inner diameter d ' corresponds to the container. Due to the further radial displacement of the mold 44, the inner diameter d of the container body 2 can be reduced in the upper region a so that it is retracted in the area a. This step can be continued until the gaps 48 between the ring segments 46 are closed are, since then, no further radial displacement is possible (Fig. 5f). The gaps 48 are advantageously dimensioned such that the outer diameter of Randbordierung 14 after closing the gaps 48 smaller as the diameter of the container body 2 is in the lower region b.

Claims (11)

1. A container of sheet metal with a container body (2, 2'), a lid (4) and a clamping ring (10), whereby the opening-side edge of the container body (2, 2') is provided with a spiral-shaped edge rim (14), the lid (4) can be pressed against the edge rim (14) by means of the damping ring (10) with the interposition of a sealing element (28) and the edge rim (14) has a locating section (18) for locating the clamping ring (10), whereby the edge rim (14) has a support section (22), which rests on the one hand on the inside of the edge rim (14) and on the other hand on the inside of the locating section (98), characterised in that the support section (22) runs at a right angle onto the inside of the locating section (18).
2. The container according to claim 1, characterised in that the support section (22) extends to a central area of the inside of the locating section (18).
3. The container according to any one of claims 1 or 2, characterised in that the locating section (18) is designed rectilinear.
4. The container according to any one of the preceding daims, characterised in that the edge rim (14) has an angle of wrap of more than 450°, preferably 510°.
5. The container according to any one of the preceding claims, characterised in that the container is drawn in in the area (a) of the edge rim (14), so that the external diameter of the affixed damping ring (10) is smaller than or as large as the maximum extemal diameter of the container body (2, 2').
6. The container according to any one of the preceding claims, characteiised in that the lid (4) is designed cup-shaped, whereby the edge of the lid (4) is provided with a rim (8) extending radially outwards, which has an angle of wrap of 180°.
7. The container according to claim 6, characterised in that the sealing element (28) is arranged inside the rim (8).
8. The container according to any one of the preceding daims, characterised in that the damping ring (10) has a locating element (12) surrounding the container body (2, 2'), which locating element can be placed against the container body (2, 2').
9. A method for producing the edge rim of a container according to any one of the preceding claims with the process steps:

   producing a spiral-shaped preliminary rim (38) on the edge of the container body and

   shaping the preliminary rim (38) by a motion of a forming tool (44) directed radially inwards, which forming tool has a negative shape (50) facing the preliminary rim (38), for producing the edge rim,

   whereby the negative shape (50) has a lower essentially rectilinear shaped section (52) for the formation of the locating section of the edge rim,
   characterised in that the forming tool (44) includes several annular segments (46) spaced apart from one another by gaps (48), said annular segments surrounding the preliminary rim (38) in an annular form, whereby the gaps (48) are closed at the end of the motion directed radially inwards, so that the annular segments (46) form a closed ring.
10. The method according to claim 9, characterised in that the forming tool (44) is moved radially inwards to an extent such that the diameter of the container body is reduced in an upper area.
11. The method according to claim 10, characterised in that the diameter of the container body is reduced in an upper area in such a way that the maximum external diameter of the edge rim is smaller than the external diameter of the container body in a lower area.

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