Tension ring

Abstract

The present new design of a clamping ring for closing a lidded barrel by means of a barrel lid concerns the bearing blocks for the pivoting attachment of a clamping ring closure with pull bar and clamping lever, whereby - without dispensing with previously common separately prefabricated components - the bearing blocks at the clamping ring ends are integrally formed from the sheet metal material of the clamping ring.

Description

[0001] The present invention relates to a clamping ring for closing a lidded drum by means of a drum lid, with a flat or rounded central part - viewed in cross section - designed as a clamping ring back and clamping ring legs adjoining it on both sides and slightly widened inwards, with at least one bearing block formed on one of the two clamping ring ends upwards over the clamping ring back for the pivotable fastening of a clamping ring closure with a tensioning yoke and clamping lever, wherein - without a separate component - the bearing block is formed integrally from the material of the clamping ring.

[0002] Clamping ring closures or clamping ring closure devices for opening and closing a clamping ring bridge the two ends of the clamping ring and have a clamping lever and a one- or two-part tension yoke, both of which are pivotally mounted on a pivot bearing base on the clamping ring side by means of a pivot bearing. The tension yoke and the clamping lever are pivotally connected to one another by means of a further common pivot bearing. The pivot bearing bases for the tension yoke and the clamping lever are usually welded onto the clamping ring ends as separate components. One such design of a clamping ring closure is known, for example, from EP 1 783 062 A2. The two known pivot bearing bases must be prefabricated and welded onto the clamping ring using a special welding machine.

[0003] DE 75 02 768 U1 discloses a clamping ring with a clamping ring closure. The bearing pins for the clamping lever and the tension bar are attached directly to the ends of the clamping ring in a punched eyelet, eliminating the need for separately welded bearing brackets. This known fastening of the bearing pins appears to be suitable for smaller lidded containers such as paint buckets or similar, but not for large-volume lidded drums, where high closing forces must be applied, thus creating a risk of the bearing pins tearing out. Furthermore, a similar clamping ring for smaller disposable containers such as buckets or fiber drums is known from DE 8802242 U1.

[0004] The object of the present invention is to propose a clamping ring, in particular for large-volume lidded drums, in which the pivotable mounting of the clamping ring closure components is suitable for high closing forces.

[0005] This object is achieved by the features set out in claim 1.

[0006] In the clamping ring according to the invention, the integrally formed bearing block is designed as a one-piece, rounded boss projecting outwards beyond the flat central part of the clamping ring back, in which two opposing, parallel flat wall parts are provided above the two lateral clamping ring legs, in each of which a drilled or punched through-hole is made, through which a bearing bolt for the pivotable fastening of the clamping ring closure can be inserted.

[0007] The bearing blocks, which are integrally formed from the sheet metal material of the clamping ring and are used for the pivoting attachment of the clamping ring closure parts, completely eliminate the two separately prefabricated bearing blocks required for conventional clamping ring closures. Furthermore, the manufacturing step of welding the separate bearing blocks onto the ends of the clamping ring is eliminated. The hump-shaped bearing blocks, with their two opposing, parallel, flat wall sections, each of which contains perforations for the precise insertion of the bearing pins, are manufactured using a one- or two-stage cold forming process that increases the material strength in the area of ​​the clamping ring ends. This can be achieved, for example, by pressing, pressing, punching, or drop forging with an appropriate forming die.

[0008] The bearing pins, which are precisely inserted into the holes, ensure precise and offset-free pivoting fastening of the clamping ring closure components, consisting of the tension yoke and clamping lever, with high transmission of high closing forces, especially with large drum lids. The risk of the bearing pins tearing out or the sheet metal tearing open at the acute-angled bearing pin openings near the clamping ring ends, which is typical of a conventional solution, is eliminated here.

[0009] In a structural design of the clamping ring with non-overlapping ends, the integral bearing block for the tension yoke of the clamping ring closure at one end of the clamping ring is designed as a hump open on one side and the integrated bearing block for the tension lever of the clamping ring closure at the other end of the clamping ring is also designed as a hump open on one side.

[0010] The manufacturing of the integral, hump-shaped bearing blocks is comparatively easy with appropriate machinery and requires less time and material than the production and welding of previously common separate bearing block components.

[0011] In another design of the clamping ring with overlapping ends, the integrated bearing block for the clamping lever of the clamping ring closure is designed as a closed hump at the other end of the clamping ring at a certain distance from the end of the clamping ring.

[0012] In this design with overlapping ends of the clamping ring, the upper end of the clamping ring, with the one-sided open boss of the integral bearing block for the tension ring closure's drawbar, has a slightly enlarged cross-section over the length of the overlapping area. When the clamping ring is closed, the overlapping end rests on the lower end of the clamping ring with a normal cross-section. This clamping ring with overlapping ends and the integral bearing blocks for the clamping ring closure ensures high closure strength even in the event of a drum crash and is particularly suitable for large-volume lidded drums containing liquids.

[0013] The invention is explained and described in more detail below with reference to exemplary embodiments schematically illustrated in the drawings. They show: Fig. 1 a side view of a clamping ring according to the invention with closed clamping ring closure in partial view, Fig. 2 a sectional view (in the ring center plane) of the clamping ring according to Fig. 1, Fig. 3 a side view of the clamping ring according to Fig. 1 with partially opened clamping ring closure Fig. 4 a sectional view (in the ring center plane) of the clamping ring according to Fig. 3 Fig. 5 an oblique view of individual components of the clamping ring closure without bearing bolts, Fig. 6 a side view of two integrally formed bearing blocks in an intermediate production stage, Fig. 7 an oblique view of another clamping ring according to the invention with the clamping ring closure open in partial view, Fig. 8 an oblique view of the overlapping clamping ring ends of the clamping ring closure according to Fig. 7, Fig. 9 a further oblique view of the overlapping clamping ring ends of the clamping ring closure according to Fig. 7 and Fig. 10 an oblique view from below of the overlapping clamping ring ends of the clamping ring closure according to Fig. 7

[0014] In Fig. 1 shows a closed clamping ring 10 with a clamping ring closure 16 consisting of a tension yoke 12 and a clamping lever 14, in which an integrally formed bearing block 22, 24 is arranged on each of the non-overlapping clamping ring ends 18, 20. The bearing blocks 22, 24 are designed as one-piece, rounded bosses 28, 30 projecting outwards beyond the flat central section of the clamping ring back 26, in which two opposing, parallel, flat wall parts 32, 34 are provided above the two lateral clamping ring legs, in each of which a drilled or punched through-hole 36 is made, through which a bearing pin 38 for the pivotable fastening of the clamping ring closure 16 can be inserted.

[0015] The sectional view in Fig. 2 shows an internal view of the closed clamping ring 10 with the integrally formed bearing blocks 22, 24. Clearly visible here are the flat wall parts 32, 34 with corresponding perforations 36 for the pivotable mounting of the tension yoke 12 and the clamping lever 14.

[0016] The integral hump-shaped bearing blocks 22, 24 with the two wall parts 32, 34 aligned parallel to each other are partially formed from the raised sheet material of the two lateral clamping ring legs.

[0017] In a similar way, Fig. 3 the clamping ring 10 according to Fig. 1 with the clamping ring closure 16 slightly opened, with the clamping lever 14 positioned at an approximate 45° angle to the clamping ring 10. Here, the bearing bracket 24 with the flat wall part 34 and the bearing pin 38 for the clamping lever 14 inserted into the perforation can now be more clearly seen.

[0018] The section view in Fig. 4 again the inside of the clamping ring 10 according to Fig. 3 with the clamping ring closure 16 slightly opened, whereby the flat wall parts 32, 34 or flat wall surfaces of the bearing blocks 22, 24 integrally formed on the non-overlapping opposite clamping ring ends 18, 20 are clearly visible.

[0019] Fig. Figure 5 shows an oblique view of a clamping ring closure 16 with the two movable components, the tension yoke 12 and the tension lever 14, without a bearing pin. The tension yoke 12 is shown detached from the clamping ring closure 16, so that the holes 36 for the bearing pins (not shown) can be seen in the individual components. The drilled or punched holes 36 in the two parallel wall sections 32, 34 of the bearing blocks 22, 24 are arranged as aligned holes 36 for inserting the bearing pins for the pivotable fastening of the tension yoke 12 and the tension lever 14, just above the central part of the clamping ring 10 or the clamping ring back 26.

[0020] An enlarged side view of the clamping ring ends 18, 20 with the integrally formed bearing blocks 22, 24 is shown in Fig. 6 is shown in an intermediate production stage with the clamping ring ends 18, 20 still connected. The clamping ring ends 18, 20 are connected to each other via a connecting piece 46. After the bearing blocks 22, 24 have been stamped or formed, this connecting piece 46 is removed in the next production stage.

[0021] Here, it becomes particularly clear that the integrally formed bearing blocks 22, 24 are each designed as one-piece, rounded bosses 28, 30 that project outward beyond the flat central portion of the clamping ring back 26. In the geometric design of the bearing blocks 22, 24, the rise from the clamping ring back 26 to the raised back of the bearing block bosses 28, 30 is slightly inclined and extends in the circumferential direction over a length of approximately one to three times the clamping ring width.

[0022] In Fig. Figure 7 shows an open clamping ring 10 in which the clamping ring ends 18, 20 overlap by a certain distance in the circumferential direction. The integrated bearing block 24 for the clamping lever 14 of the clamping ring closure 16 is designed as a closed boss 40 at a certain distance from the clamping ring end 20. The clamping lever 14 is provided with a securing slot 42, which, when closed, is aligned with a securing tab 44 arranged on the clamping ring back 26, so that a metal strip can be pushed through as a securing element, preventing accidental opening of the clamping ring closure, e.g., in the event of a barrel falling over.

[0023] At the overlapping ends of the clamping ring 10, the upper overlapping end 18 with the one-sided open boss 28 of the integral bearing block 22 for the tension yoke 12 of the clamping ring closure 16 has a slightly enlarged cross-section for the length of the overlapping area and, in the closed state of the clamping ring 10, rests on the lower end 20 of the clamping ring 10 with a normal cross-section.

[0024] Fig. For clarity, Figure 8 shows the clamping ring 10 with overlapping ends 18, 20 without the locking components, the clamping lever and the tension yoke. This shows the slightly slanted rise from the clamping ring back 26 to the raised back of the bearing bracket bosses 28, 40. The slanted rise extends in the circumferential direction over a length of approximately one to three times the clamping ring width.

[0025] Commercially available clamping rings for standardized 220-liter steel or plastic lidded drums have a diameter of 545 mm or 572 mm, whereby the material thickness of the clamping ring can be between 0.5 mm and 2 mm and the clamping ring width between 15 mm and 25 mm.

[0026] The overlapping clamping ring ends 18, 20 of the clamping ring 10 are in Fig. 9 in an oblique view from above, while Fig. 10 shows a corresponding oblique view from below of the overlapping clamping ring ends. The length of the overlap area with the slightly enlarged cross-section at the end 18 of the clamping ring 10 with the hump 28, which is open on one side, of the integral bearing block 22 for the tension yoke 12 can extend in the circumferential direction over a length of approximately one to five times the clamping ring width.

[0027] In this case, the width of the bearing block 22 for the tensioning yoke 12 in the region of the two flat wall parts 32, 34 aligned parallel to one another can be wider than the width of the bearing block 24 for the tensioning lever 14 by at least twice the wall thickness of the tensioning ring.

[0028] From these two representations it is further clear that the drilled or punched through holes 36 in the two parallel wall parts 32, 34 of the bearing blocks are arranged as aligned through holes 36 for inserting the bearing bolt 38 for the pivotable fastening of the tensioning yoke 12 and the tensioning lever 14 just above the central part of the tensioning ring 10 or the tensioning ring back 26.

[0029] Conventional clamping rings are made from steel or stainless steel flat strip material with a material thickness of 0.5 to 2.0 mm. The flat strip material is first formed longitudinally to a specific cross-sectional profile (V-shaped, trapezoidal) and then bent into a round arch with the diameter of the desired clamping ring size. The bearing blocks for the clamping ring closure are welded onto the clamping ring ends.

[0030] The process for producing the clamping ring according to the invention is characterized by the following process steps: - Profiling of flat strip material to a specific cross-sectional profile, - Bending the profiled flat strip material into a round arch with the diameter of the desired clamping ring size as an endless spiral, - at a specified location on the endless spiral, the two bearing blocks for the tensioning yoke and the tensioning lever of the clamping ring closure are integrally formed into the profiled sheet material of the endless spiral, - Cutting the endless spiral between the two molded bearing blocks for the tensioning yoke and the tensioning lever to create a separate one-piece tensioning ring as a 360° round arch.

[0031] The bearing block for the tension bar of the first clamping ring is pressed into the endless spiral at the same time as the bearing block for the tension lever of the second clamping ring. By separating a 360° arc between the two bearing blocks, the one-piece clamping ring is created with bearing blocks integrally molded onto the ends of the clamping ring on both sides. After separating the 360° arc with bearing blocks integrally molded onto the ends of the clamping ring on both sides, only the bearing bolts are inserted through the bearing block for the tension bar and the bearing block for the tension lever and secured.

[0032] This automated manufacturing technology advantageously enables high and cost-effective production speed. Conclusion

[0033] The bearing blocks are integrally formed from the material of the clamping ring, eliminating the need for the previous separately prefabricated bearing blocks, which were usually welded onto the clamping ring using two-point electric welding. With few exceptions, the clamping ring and closure with bearing blocks are made of galvanized sheet steel. The precision of the welding of the galvanized sheet metal parts depends on various factors (e.g. welding time, current strength, contact pressure, etc.) and can be problematic. During spot welding, the thin zinc coating in the area of ​​the weld points evaporates. This can lead to defective welds. These areas are also fundamentally the starting point for rust formation. The two weld points of the two conventional bearing blocks must each transmit the entire tensile forces when closing the clamping ring and during the entire closure period.

[0034] With the clamping ring according to the invention, spot welding of the bearing blocks is completely eliminated. In addition to the significant time and material savings in the production of these clamping rings, the risk of cracking at welds is also eliminated.

[0035] Known lightweight designs of clamping rings for smaller lidded containers, which already do not require separate bearing blocks, have two triangular longitudinal slotted openings on the sides above the clamping ring legs and the slightly raised clamping ring back for inserting and supporting the bearing pins. With the pointed longitudinal slotted openings, there is a risk that the bearing pins will act like wedges under high tensile loads and that cracks can easily form towards the ends of the clamping ring and tear out the bearing pins. This risk is not present with the clamping ring according to the invention with drilled or punched holes in the two parallel wall sections of the bearing blocks as aligned holes for inserting the bearing pins for the pivoting attachment of the tensioning yoke and clamping lever. List of reference numbers 10 clamping ring 12 tension yokes (16) 14 clamping levers (16) 16 tension ring closure (10) 18 clamping ring ends (12) 20 clamping ring ends (14) 22 bearing blocks (12) 24 bearing blocks (14) 26 clamping ring backs (10) 28 humps (18) 30 humps (20) 32 flat wall part (28) 34 flat wall part (30) 36 holes (32,34, 12,14) 38 bearing bolts (32,34, 12,14) 40 closed hump (20) 42 safety slot (14) 44 securing tab (10) 46 connecting piece (22, 24) QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 1 783 062 A2

[0002] DE 75 02 768 U1

[0003] DE 8802242 U1

[0003]

Claims

[1] Clamping ring (10) for closing a lidded drum by means of a drum lid with a flat central part - viewed in cross-section - designed as a clamping ring back (26) and clamping ring legs adjoining it on both sides and slightly widened on the inside, with at least one bearing block (22, 24) formed on one of the two clamping ring ends (18, 20) upwards beyond the clamping ring back (26) for the pivotable fastening of a clamping ring closure (16) with a tension yoke (12) and clamping lever (14), wherein - without a separate component - the bearing block (22, 24) is formed integrally from the material of the clamping ring (10), characterized bythat the integrally formed bearing block (22, 24) is designed as a one-piece, rounded boss (28, 30) projecting outwards beyond the flat central part of the clamping ring back (26), in which two opposing, parallel-aligned flat wall parts (32, 34) are provided above the two lateral clamping ring legs, in each of which a drilled or punched through-hole (36) is made, through which a bearing bolt (38) for the pivotable fastening of the clamping ring closure (16) can be inserted. [2] Clamping ring (10) according to claim 1, characterized by that the integral bearing block (22) for the tension yoke (12) of the clamping ring closure (16) is designed as a hump (28) open on one side at one end (18) of the clamping ring. [3] Clamping ring (10) according to claim 1 or 2, characterized bythat the integrated bearing block (24) for the clamping lever (14) of the clamping ring closure (16) at the other end (20) of the clamping ring (10) is also designed as a hump (30) open on one side when the ends of the clamping ring (10) do not overlap. [4] Clamping ring (10) according to claim 1 or 2, characterized by that the integrated bearing block (24) for the clamping lever (14) of the clamping ring closure (16) at the other end (20) of the clamping ring (10) is designed as a closed hump (40) with overlapping ends of the clamping ring (10) at a certain distance from the clamping ring end (20). [5] Clamping ring (10) according to claim 1, 2, 3 or 4, characterized by that the integral hump-shaped bearing blocks (22, 24) with the two wall parts (32, 34) aligned parallel to one another are partially formed from raised sheet material of the two lateral clamping ring legs. [6] Clamping ring (10) according to claim 1, 2, 3, 4 or 5, characterized bythat when the ends of the clamping ring (10) overlap, the top overlapping end (18) of the clamping ring (10) with the boss (28) of the integral bearing block (22) open on one side for the tension yoke (12) of the clamping ring closure (16) has a slightly enlarged cross-section for the length of the overlap area and, when the clamping ring is closed, rests on the lower end (20) of the clamping ring (10) with a normal cross-section. [7] Clamping ring (10) according to claim 1, 2, 3, 4, 5 or 6, characterized by that the rise from the clamping ring back (26) to the raised back of the bearing block bosses (28, 30, 40) is slightly inclined and extends in the circumferential direction over a length of approximately one to three times the clamping ring width. [8] Clamping ring (10) according to at least one of the preceding claims 1 to 7, characterized bythat the width of the bearing block (22) for the tensioning bracket (12) in the region of the two flat wall parts (32, 34) aligned parallel to one another is wider than the width of the bearing block (24) for the tensioning lever (14) by at least twice the wall thickness of the tensioning ring (10). [9] Clamping ring (10) according to at least one of the preceding claims 1 to 8, characterized by that the drilled or punched through holes (36) in the two parallel wall parts (32, 34) of the bearing blocks (22, 24) are arranged as an aligned through hole (36) for the insertion of the bearing bolt (38) for the pivotable fastening of the tension yoke (12) and the tension lever (14) just above the middle part of the tension ring (10) or tension ring back (26). [10] Method for producing the clamping ring according to at least one of the preceding claims 1 to 9, characterized by , the following procedural steps: - Profiling of flat strip material to a specific cross-sectional profile, - Bending the profiled flat strip material into a round arch with the diameter of the desired clamping ring size as an endless spiral, - at a specified location on the endless spiral, the two bearing blocks for the tensioning yoke and the tensioning lever of the clamping ring closure are integrally formed into the profiled sheet material of the endless spiral, and - Cutting the endless spiral between the two molded bearing blocks for the tensioning yoke and the tensioning lever to create a separate one-piece tensioning ring as a 360° round arch.

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