EP3848299B1 - Clamping ring locking device - Google Patents

Description

The present invention relates to a clamping ring locking device for a clamping ring with a clamping lever and a one-part or two-part clamping bracket, both of which are pivotably attached to a pivot bearing base on the clamping ring side, the clamping bracket and the clamping lever being pivotably connected to one another by means of a further common pivot bearing . The present invention further relates to a clamping ring with the clamping ring locking device.

As a rule, clamping rings have a U-shaped or trapezoidal cross-sectional profile, in which a flat or rounded center piece connects an upper and a lower clamping ring leg. At least one of the two clamping ring legs is designed to run obliquely, often both clamping ring legs are also designed to run obliquely, with the distance between the two clamping ring legs increasing inwards towards the center point of the clamping ring. In particular embodiments of clamping rings, a collar-shaped flange edge angled upwards and/or downwards can adjoin the upper and/or lower clamping ring leg.

The clamping ring locking device bridges the two ends of the clamping ring, with the clamping ring-side pivot bearing base of the clamping lever being firmly welded to one end of the clamping ring and the clamping ring-side pivot bearing base of the tension bracket being firmly welded to the other end of the clamping ring. When the clamping lever is closed, the closed clamping ring has its smallest diameter, and when the clamping lever is opened, the open clamping ring has its largest diameter.

The largest diameter of the opened clamping ring is required when putting on and removing the clamping ring from the lid flange edge and barrel body flange edge. To do this, the clamping lever must be held in the fully opened position by hand. The smallest diameter of the closed clamping ring with the clamping lever folded in is required for the axial clamping and pressing together of the drum lid with the drum lid seal on the barrel body mouth or the barrel body edge.

Clamping rings with clamping ring closure device for releasably fastening a barrel lid on a lid barrel are known in a wide variety of embodiments, such. B. from the publication DE 20 2013 000 452 U1 (Berger ). In the case of the clamping ring described therein, the clamping lever is fixed in the closed position by structural means in order to prevent the clamping lever or the clamping ring closure from being able to open accidentally or unintentionally. For securing or fixing the closed clamping lever in the closed position, there are many other proposed solutions in the known prior art.

problem :

In contrast, the present invention addresses a different set of problems. When manufacturing clamping rings, on the one hand the clamping ring locking device with its two pivot bearing bases must be welded onto the two ends of the clamping ring. Since the clamping lever is only connected to the clamping bracket by means of a pivot bolt, and the clamping lever and clamping bracket are also pivotably mounted on the two pivot bearing bases on the outside by means of pivot bearings, this prefabricated component unit represents a comparatively unstable matter that is difficult to handle.

On the other hand, when opening a lidded barrel, the clamping lever of the clamping ring must be brought into a wide open position and held manually in order to be able to lift the open clamping ring from the barrel lid or lidded barrel. When closing the lidded barrel, the clamping lever of the clamping ring must be held in the wide open position with the largest diameter and only then can the opened clamping ring be placed over the edge of the mounted barrel lid and the lidded barrel edge and firmly closed.

It is the object of the present invention to simplify the handling of a clamping ring closure device as a prefabricated component unit during further processing and the handling of a clamping ring with a welded clamping ring closure device when closing and opening a lidded drum with a drum lid and further automation in the clamping ring production as well to allow for lidded barrel closing machines.

This object is achieved according to the invention in that the two components, the clamping lever and the clamping bracket, are provided with structural means which are designed in a functionally mutually coordinated mode of action between the two components as a snap-locking device for fixing the clamping ring closure device in the wide open clamping lever position are.

As a constructive means, the clamping lever and/or the tension bracket are provided with a special locking device that fixes the clamping lever in a wide open position with an opening angle of more than 90°.

By fixing the clamping ring closure device in a wide-open clamping lever position by means of the locking device designed as a snap-locking device, the clamping ring closure device can be handled much better during further processing. As a prefabricated component unit, the clamping ring locking device, which consists of four individual components that are connected via pivot bearings so that they can be pivoted, now there is no longer an unstable chain of components, but can be used in a defined rigid position in a storage magazine and then z. B. be fed to a welding machine for welding the pivot bearing base with the clamping ring blank. After completion of the welding process, the fully welded clamping ring with fixed clamping ring closing device can be transported in a wide open clamping lever position by an automatic gripping and conveying device to a lidded drum closing machine, where the widely spread clamping ring is automatically placed on a lidded drum with a drum lid and is closed.

In a constructive embodiment of the invention, it is provided that the locking device is designed as a snap-locking device with a snapping element and a locking element, the snapping element being arranged either on the clamping bracket or on the clamping lever and the locking Element is arranged correspondingly opposite to the clamping lever or to the tension bracket.

The mutual fixation of the clamping lever and the clamping bracket causes the clamping ring locking device to spread wide or open wide, thus creating the possibility of storing and transporting this component group in a defined, stable arrangement and of handling a clamping ring provided with the clamping ring locking device according to the invention generally to simplify and facilitate.

In a specific embodiment of the invention, it is provided that the tension bracket has two parallel, opposite outer flanks, each of which is provided on its inner side with at least one protruding projection directed towards the opposite outer flank, which when the clamping lever is positioned wide open in a corresponding manner snaps into a matching recess or recess in both outer sides of the side walls of the clamping lever.

Especially with clamping rings with a larger diameter z. B. for 220 l lidded drums, the two parallel, opposite outer edges of the clamping bracket are connected via a common center piece and are designed as a one-piece component. This results in greater stability of the entire clamping ring closure device.

In a further embodiment of the clamping ring locking device, the snap-locking device arranged between the clamping bracket and the clamping lever is designed in such a way that when the clamping lever is positioned wide open, the snapping element engages with the locking element, with the clamping lever having an opening angle of greater than 160° is fixed against the tension bracket.

In the preferred embodiment of the clamping ring locking device according to the invention, the clamping bracket is extended on both sides by a short distance beyond the pivot bearing C that is common to the clamping lever, and these extensions each have an indentation on the outside and, correspondingly, an inward-pointing projection (locking cam) on the inside. in the side walls of the clamping lever on both sides at a corresponding point a depression is provided, in which the projection is designed to be snapped and latched in a fixing manner oppositely (vis a vis) when the clamping lever is positioned wide open.

When considering a clamping ring with a closed clamping ring lock, the clamping lever rests on the clamping ring and the opening angle is zero. When the clamping ring lock is open, the clamping lever usually protrudes at a right angle from the clamping ring, i. H. the opening angle is about 90 degrees. The clamping ring is no longer under tension, but must be opened further by hand and held to place it on the barrel lid and to remove it from the edge of the lid. By fixing the clamping ring locking device in a wide open position with an opening angle of the clamping lever of more than 160°, the clamping ring can be easily removed from the rim of the barrel or the edge of the lid without having to constantly hold the clamping lever by hand. It is now also possible to automatically place and close clamping rings with a fixation of the clamping ring closure device in a fully open position and with the largest possible diameter in automatic lidded drum closing systems on drum lids of lidded drums.

In a further advantageous embodiment of the invention, the clamping lever on its side opposite the pivot bearing C - at the same distance as the inward-pointing projections (locking cams) on the extension of the tension bracket from the pivot bearing C - is equipped on both sides with corresponding depressions in its side walls in such a way that the Projections on the extension of the clamping bracket when the clamping lever is fully closed are designed to be snapped and latched into the corresponding depressions in the side walls of the clamping lever, fixing them as a locking device for the clamping lever.

The indentations can also be in the form of oblong holes, like the oblong holes already present in the clamping lever for the known locking device by means of a seal with a clamping ring eyelet.

Figur 1

einen Spannring mit erfindungsgemäßem Spannring-Verschluss in Seitenansicht,

Figur 2

einen geöffneten Spannring-Verschluss in Seitenansicht,

Figur 3

den Spannring-Verschluss gem. Fig.2 in vollständig geöffneter Positionierung in Seitenansicht,

Figur 4

einen einteiligen Zugbügel eines Spannring-Verschlusses,

Figur 5

einen Spannhebel in Seitenansicht,

Figur 6

einen anderen einteiligen Zugbügel eines Spannring-Verschlusses,

Figur 7

einen anderen Spannring-Verschluss in vollständig geöffneter Positionierung in Seitenansicht,

Figur 8

einen weiteren erfindungsgemäßen Spannring-Verschluss mit geschlossenem Spannhebel in Seitenansicht,

Figur 9

eine Draufsicht auf den Spannring-Verschluss gem. Fig.8,

Figur 10

den Spannring-Verschluss gem. Fig.8 mit halb geöffnetem Spannhebel in Seitenansicht und

Figur 11

den Spannring-Verschluss gem. Fig.8 mit nahezu vollständig geöffnetem Spannhebel in Seitenansicht

The invention is explained and described in more detail below with reference to exemplary embodiments shown schematically in the drawings. Show it :

figure 1

a side view of a clamping ring with a clamping ring closure according to the invention,

figure 2

an open clamping ring closure in side view,

figure 3

the clamping ring closure acc. Fig.2 in fully open position in side view,

figure 4

a one-piece clamp of a clamping ring closure,

figure 5

a cocking lever in side view,

figure 6

another one-piece drawbar of a clamping ring clasp,

figure 7

another clamping ring clasp in fully open position in side view,

figure 8

another clamping ring closure according to the invention with a closed clamping lever in a side view,

figure 9

a top view of the clamping ring closure acc. Fig.8 ,

figure 10

the clamping ring closure acc. Fig.8 with half-open cocking lever in side view and

figure 11

the clamping ring closure acc. Fig.8 with the cocking lever almost completely open, seen from the side

In figure 1 the reference number 10 designates a clamping ring closure device according to the invention for a clamping ring 12 . The main elements of the clamping ring locking device 10 are a clamping lever 14 and a clamping bracket 16 .

Such clamping rings are z. B. used to close lidded drums. The barrel lids are mostly made of plastic or metal, the lid barrel bodies can also be made of plastic, metal or unwrapped kraft paper (fiber drum, cardboard drums). The clamping rings are made of galvanized sheet steel profile and can have diameters from 80 mm to 2000 mm with material thicknesses between 0.5 mm and 2.5 mm. By default, the diameter is between 100 mm and 800 mm. When viewed in cross-section, the clamping rings have an expanded U-shaped or trapezoidal profile with or without a collar-shaped flange edge. The collet rings may be formed below the collet closure device with a short overlap, long overlap, or no overlap.

As in figure 2 As can be seen, the main elements, the clamping lever 14 and the clamping lever 16, are both fastened pivotably by means of pivot bearings 18 (B), 20 (A) on a pivot bearing base 22, 24 on the side of the clamping ring, with the clamping bracket 16 and the clamping lever 14 being connected by means of a further common pivot bearing 26 ( C) are pivotally connected to each other. Thus, the clamping ring closure device 10 as a prefabricated component unit consists of four individual components 14, 16, 22, 24 which are movably connected to one another via three pivot bearings 18 (B), 20 (A), 26 (C). The clamping ring locking device 10 bridges the two ends of the clamping ring 12, with the one end of the clamping ring 12 of the clamping ring-side pivot bearing base 22 of the Clamping lever 14 and on the other end of the clamping ring 12 of the clamping ring-side pivot bearing base 24 of the tension bracket 16 are firmly welded. When the clamping ring locking device 10 is closed, the clamping lever 14 lies flat on the clamping ring 12 . A sealing eyelet 46 arranged on the clamping ring 12 is covered by a slot 44 arranged in the side walls 38 of the clamping lever. To ensure originality, a sealing tongue or a sealing wire can be guided through the oblong holes 44 on both sides and the sealing eyelet 46, the intactness of which indicates an originally closed cover.

The clamping ring closure 10 shown is in the normally open position, in which the clamping lever 14 usually remains in a 90° position without tension and protrudes from the clamping ring 12 at an approximately right angle.

According to the present invention, the clamping ring closure 10 is provided in the vicinity of the common pivot bearing 26 of the clamping lever 14 and the clamping bracket 16 with a locking device 28, which in the present embodiment as a snap-locking device with a locking element 42 and a snap -Element 44 is formed between the clamping bracket 16 and the clamping lever 14. The latching element 42 can be arranged either on the tensioning lever 16 or on the tensioning lever 14 and the snap-in element 44 can be arranged correspondingly opposite one another on the tensioning lever 14 or on the tensioning lever 16 . In the present case, the elongated hole 44 mentioned serves at the same time as a snap-in element in the open position of the clamping lever 14. As a latching element 42, two round indentations arranged next to one another are pressed into the outer flanks of the clamping yoke 16 from the outside Locking cams are formed.

The special design feature of this clamping ring closure 10 is that the snap-locking device engages in a wide open position of the clamping lever 14 in a coordinated functional mode of action between the clamping lever 14 and the clamping bracket 16 and the clamping lever 14 - in relation to the clamping lever-side pivot bearing base 22 - fixed in wide open position with an opening angle greater than 90°. The locking cam locking elements 42 snap into the elongated hole snap-in elements 44 .

This wide open positioning of the clamping ring closure 10 with the latching cam latching elements 42 snapped into the slotted hole snapping elements 44 (not visible) is in figure 3 shown. Another elongated hole 48 is provided in the clamping lever 14 between the common pivot bearing 26 and the pivot bearing 20 on the clamping ring side. This slot 48 is only important when the clamping lever 14 is closed. When the clamping lever 14 is closed, the locking cam locking elements 42 snap into this slot 48 or snap-in element and advantageously provide an additional fixation for the clamping lever 14 in closed state. In principle, the latching elements 42 have the same distance from the pivot bearing 26 as the snap-in elements 44.

The fixing of the clamping lever 14 in relation to the clamping bracket 16 in a wide-open position makes the closure device 10 a stable component unit that is significantly easier to handle in the production of the clamping ring. For series mass production, the prefabricated closure device is now used as a stable component unit in a defined, spread-out form for storage and transport in large numbers in a corresponding grid-like holding frame. These holding frames are then transported to an automatic welding machine and fed there to a storage magazine, so that a spread or wide open closure device that is individually removed from it by a gripper of the automatic welding machine is automatically placed on a clamping ring blank fed from another side and automatically welded to it. The finished clamping rings with the sealing device welded on are then stored in another frame in a wide open state and transported to a designated place of use with an automatic lidded drum sealing machine. There, a barrel lid is mechanically placed on each lid barrel body and a finished, wide-open clamping ring is placed over the edge of the barrel lid and clamped, and the lid barrel is thus automatically closed.

figure 4 shows, in an enlarged representation, another clamping bracket 16 of a clamping ring locking device 10 according to the invention, in which the outer flanks 30, 32 are connected via a center piece 40. In the outer flanks 30, 32 of the one-piece clamping bracket 16, two elongated depressions 36 are formed from the outside, which are formed on the inside of the clamping bracket flanks 30, 32 as projecting rib-like latching cams 34. These rib-like latching cams 34 represent the latching elements of the snap-in latching device for the clamping ring closure device 10. When the clamping lever 14 is positioned wide open, the rib-like latching cams 34 snap into the corresponding elongated holes 44 or snap-in elements in the side walls 38 of the Clamping lever 14 and fix the two components against each other. In figure 5 the clamping lever 14 is shown again in an enlarged side view with the two elongated holes 44, 48 and the two pivot bearings 18 and 26. As mentioned, the latching elements or latching cams 34 snap into the snapping elements or slots 44 when the clamping lever 14 is fully open and into the snapping elements or slots 48 when the clamping lever 14 is fully closed.

In the case of heavier clamping rings 12 for larger lidded drums, the clamping ring locking devices 10 are no longer provided with two separate metal strip-like clamping brackets, but with a one-piece clamping bracket 16 in which the two parallel, opposite metal strip-shaped outer flanks 30, 32 are connected to one another via the common center piece 40 . The following detailed descriptions of Structural design for a one-piece clamping bracket 16 should of course also apply to two-piece clamping brackets.

In the preferred embodiment of the invention, the tension bracket 16 behind the pivot bearing 26 on the side of the clamping ring (=swivel joint C) is designed to be lengthened by a short distance. This short piece of extension 54 is about as long as the outer flanks 30, 32 of the yoke 16 are high, i. H. in this specific case, the extension 54 has a length of between 8 mm and 36 mm, preferably 12 mm. The length of the extension should be designed just long enough to ensure elastic behavior of the snap-lock device and plastic bending of the extension is excluded.

figure 6 shows an example of such a tension bracket 16, in which the outer flanks 30, 32 behind the pivot bearing 26 are each provided with the extension 54. On each outside of the extension 54 is stamped an indentation 50 which is formed on the inside of the extension 54 as a protrusion 52 pointing inwards. In the present case, this inside projection 52 is designed as a round locking cam and represents the locking element for a snap-on element (round hole, slot) arranged on the outside of the clamping lever 14.

In principle, a projection (34, 52) or a locking cam or elevation protruding by approx Oblong hole, round hole, groove, groove, oblong depression or indentation considered, which result in a snap-locking device in cooperation.

Another clamping ring closure 10 in fully open position is in figure 7 shown. The locking device 28 required for this is designed as a snap-lock device between the extension 54 of the tension bracket 16 and the tensioning lever 14, with the locking element being formed as a rib-like projection in the extension 54 and in the on the outside of the tensioning lever 14 as a Snap element provided slot 44 snaps. The rib-like projection (not visible here) is formed by the rib-like indentation 50 . In this arrested, fully open position, the clamping lever 14 has an opening angle to the end of the clamping ring on the clamping lever side of between 90° and 180°, preferably approximately 160°. When the clamping ring locking device is closed or the clamping ring is closed, the clamping lever rests on the clamping ring and the three swivel bearings lie almost in a curved line running around the circumference of the clamping ring, with the swivel bearing being positioned on the swivel bearing base of the clamping lever between the other two swivel bearings (ABC) . When the clamping ring locking device is completely open or the clamping ring is open, the back of the clamping lever lies almost on the center piece of the clamping lever and the three swivel bearings are almost in a curved line, whereby the common swivel bearing of the tensioning lever and tensioning bow is now positioned between the swiveling bearing on the swiveling bearing base of the tensioning lever and the swiveling bearing on the swiveling bearing base of the tensioning bow (ACB).

A clamping ring closure 10 according to the invention with a closed clamping lever 14, which is intended for series production in a preferred embodiment of the present invention, is in figure 8 shown in side view. The articulated connection between the clamping lever 14 and the clamping bracket 16 is provided by the common pivot bearing 26 . The pivot bearing 20 on the clamping ring side with the associated pivot bearing base 24 of the tension bracket 16 is arranged on the side of the tension bracket 16 facing away from the clamping lever 14 . The pivot bearing on the side of the clamping ring and the associated pivot bearing base of the clamping lever 14 is arranged under the tension bracket 16 and is not visible here. On the side of the clamping lever 14 facing the tension bracket 16 in the vicinity of the pivot bearing 26, the extension 54 is formed, in which the here round indentation 50 with an inside projection 52 (not visible here) is stamped or embossed. In the side wall of the clamping lever 14, the elongated hole 48 for inserting a seal of the clamping ring closure in the closed position can be seen. Below the elongated hole 48, a narrowing 58 of the clamping ring 14 extending up to the pivot bearing 18 on the clamping ring side can be seen.

In figure 9 the clamping ring closure is shown in plan view. The extension 54 of the clamping bracket 16 beyond the pivot bearing 26 in the direction of the clamping lever 14 can be seen here. The indentations 50 are embossed at the end of each extension 54 and snap into the corresponding snap-in elements or round holes 56 with their inside projections 52 . A total of four such round holes 56 are expediently made in the side walls of the clamping lever 14 on both sides of the pivot bearing 26, as shown in figure 10 can be seen in the clamping ring lock with half-open clamping lever 14. The round holes 56 in the clamping lever 14 are arranged at the same distance from the pivot bearing 26 as the distance between the indentation 50 and the inside projections 52 in the extension 54 of the tension bracket 16.

When the clamping lever 14 is closed (cf. 8 ) the inside projections 52 of the extension 54 of the tension bracket 16 sit in the round holes 56 arranged laterally next to the elongated hole 48 and when the clamping lever 14 is completely open, the inside projections 52 (locking cams) sit in the round holes arranged between the pivot bearing 26 and the pivot bearing 18 of the clamping lever 14 56. This ensures, as an additional advantage, in both end positions of the tensioning lever 14 a snap-lock arrangement with locking or fixing of the tensioning lever 14 in the open or closed position. The open positioning of this tension ring closure is once again in figure 11 in Side view shown. Here, the projection 52 on the inside of the extension 54 has snapped into the round hole 56 which is arranged between the two pivot bearings 26, 18 of the clamping lever 14. As a design innovation, this clamping ring 12 with clamping ring closure device 10 according to the invention is characterized in that the clamping ring 12, when the clamping ring closure device 10 is fully open and fixed in position - compared to the closed position - has a diameter that is at least 5% larger and remains rigid without manually holding the clamping lever 14 has. Fully open clamping rings have z. B. for a 220 l lidded drum a clamping ring diameter of up to. 635 mm and can be stored and transported in a magazine when open, e.g. B. to an automatic filling system for lidded drums with subsequent lidded drum closing system for automatically placing and closing the clamping rings on drum lids and lidded drums.

reference number list

10

Clamping ring locking device (12)

12

clamping ring

14

clamping lever (10)

16

drawbar (10)

18

Pivot bearing B (14)

20

Pivot bearing A (16)

22

Pivot Bearing Base (14)

24

Pivot Bearing Base (16)

26

Pivot bearing C (14, 16)

28

locking device 28 (14, 16)

30

outer flank (16)

32

outer flank (16)

34

locking cams (30,32)

36

deepening (38)

38

side wall (14)

40

middle piece (16)

42

locking element (16)

44

snap element (38, 14)

46

Sealing eyelet (12, 22)

48

elongated hole (38, 14)

50

indentation (16)

52

Projection (16, 30, 32)

54

Extension (16, 30, 32)

56

Round hole or bore (14)

58

Slimming (14)

Claims (10)

1. A closing ring closure device (10) for a closing ring (12), having a closing lever (14) and a one-piece or two-piece traction bracket (16), each of which are pivotably mounted by means of pivot bearings (18, 20) on a pivot bearing base (22, 24) on the closing ring side, wherein the traction bracket (16) and the closing lever (14) are pivotably connected to one another by means of a further pivot bearing (26),
   characterized in that
   the two components closing lever (14) and traction bracket (16) are provided with constructive means which are designed in a mutually coordinated functional mode between the two components as a snap-fit device for fixing the closing ring closure device (10) in a wide open closing lever position.
2. The closing ring closure device (10) for a closing ring (12) according to claim 1,
   characterized in that
   as constructive means the closing lever (14) or/and the traction bracket (16) are provided with a special locking device (28) which fixes the closing lever (14) in a wide-open position at an opening angle of greater than 90°.
3. The closing ring closure device (10) for a closing ring (12) according to claim 2,
   characterized in that
   the locking device (28) is designed as a snap-fit device with a snap element (44) and a latching element (42), wherein the snap element (44) is arranged either on the traction bracket (16) or on the closing lever (14) and the latching element (42) is arranged correspondingly opposite on the closing lever (14) or on the traction bracket (16).
4. The closing ring closure device (10) for a closing ring (12) according to claim 1, 2 or 3,
   characterized in that
   the traction bracket (16) has two parallel outer flanks (30, 32) facing each other, each of which is provided on its inner side with at least one protrusion (34) directed towards the opposite outer flank (32, 30) and latching into a corresponding notch or recess (36) in any of the outer sides of the side walls (38) when the closing lever (14) is in wide open position.
5. The closing ring closure device (10) for a closing ring (12) according to claim 4,
   characterized in that
   the two parallel, opposing outer flanks (30, 32) of the traction bracket (16) are interconnected via a common center piece (40) and are formed as a one-piece component.
6. The closing ring closure device (10) for a closing ring (12) according to claim 3,
   characterized in that
   the snap-fit device arranged between the traction bracket (16) and the closing lever (14) is designed in such a way that, when the closing lever (14) is in the wide-open position, the snap element (44) engages with the latching element (42), wherein the closing lever (14) is fixed against the traction bracket (16) at an opening angle of greater than 160°.
7. The closing ring closure device (10) for a closing ring (12) according to claim 1, 2, 3, 4, 5 or 6,

   characterized in that

   the traction bracket (16) has short extensions on both sides beyond the further pivot bearing (26) common to the closing lever (14), and that said extensions (54) each have indentations (36, 50) on the outside and, respectively, protrusions (34, 52) on the inside pointing inwards, wherein in the side walls of the closing lever (14) corresponding recesses (44, 48, 56) are provided on both sides,

   into which the protrusions (34, 52) can be snapped and latched opposingly (vis a vis) in a locking manner when the closing lever (14) is in wide open position.
8. The closing ring closure device (10) for a closing ring (12) according to claim 7,
   characterized in that
   the closing lever (14) - at the same distance from the further pivot bearing (26) as the inwardly pointing protrusions (34, 52) on the extension (54) of the traction bracket (16)

   - has on its side opposite the further pivot bearing (26) corresponding recesses (48, 56) on both sides such that the protrusions (34, 52) can be snapped and latched into the corresponding recesses (48, 56) in a locking manner as a closure device for the closing lever (14) when the closing lever (14) is in the completely closed position.
9. The closing ring closure device (10) for a closing ring (12) according to at least one of the preceding claims 1 to 8,
   characterized in that
   the closing lever (14), when the closing ring closure device (10) is in the wide-open and fixed position, has an opening angle - between the closing lever (14) and the closing ring end on the closing lever side - from the completely closed position to the wide-open opening position of between 90° and 180°, preferably approximately 160°.
10. A closing ring (12) with a closing ring closure device (10) according to at least one of the preceding claims 1 to 9,
    characterized in that
    the closing ring (12), when the closing ring closure device (10) is in fully opened and fixed position, has - compared to the closed closing ring closure device (10) - a rigidly persisting diameter enlarged by at least 5% without manual holding of the closing lever (14).

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