Method for elastically deforming a circular sealing ring into a kidney shape and associated sealing ring deformation device

Abstract

A method for elastically deforming a circular sealing ring (1) to a circumferential diameter (DU) which is smaller than the outer diameter (DA) of the undeformed, circular sealing ring (1) comprises the following method steps: deforming the circular sealing ring (1) to form a waisted sealing ring (1') with two opposing end loops (2, 3) and a waist (4) located therebetween with two opposing waist sections (4a, 4b) by pressing two sections (5a, 5b) of the circular sealing ring (1) together until the two sections (5a, 5b) form the two waist sections (4a, 4b);andclamping the two waist sections (4a, 4b) to one another between a convex deflecting element (6) and a counter-bearing element (7) and bending the two loops (2, 3) around the convex deflecting element (6) without relative displacement of the clamped waist sections (4a, 4b) to form a kidney-shaped sealing ring (1'') whose circumferential diameter (DU) is smaller than the outer diameter (DA) of the undeformed, circular sealing ring (1).;

Description

The present invention relates to a method for elastically deforming a circular sealing ring to a circumferential diameter smaller than the outer diameter of the undeformed circular sealing ring, as well as to an associated sealing ring deformation device.In order to insert a circular sealing ring into an inner annular groove of an opening, the circular sealing ring must first be elastically deformed to an encircling diameter which is smaller than the opening diameter. When the sealing ring, which is held in a deformed manner, is positioned within the opening, the sealing ring is released, so that it relaxes into the original circular shape due to its intrinsic elasticity and, in the process, automatically positions itself into the annular groove.In FIGS. 5 a, 5 b, a conventional sealing ring deforming device 100 for elastically deforming a circular sealing ring 101 into a kidney shape is shown, the circumferential diameter of which is smaller than the outer diameter of the undeformed circular sealing ring 101. The seal ring deformation device 100 comprises four rollers 102-105, three rollers 102-14 of which are arranged in a fixed position along their perimeter at 3, 6 and 9. A fourth roller, in its outer end position shown in FIG. 5 a, is tangent on the inside to the circumcircle at 0 o'clock and is mounted so as to be displaceable radially inward beyond the circumcircle center in the direction of the middle roller 103 in the direction of the double arrow.A circular sealing ring 101 whose inner diameter is equal to or slightly greater than the circumferential diameter is inserted into the sealing ring deformation device 100 and touches the three rollers 102- 104 with its inner side and the fourth roller 105 (FIG. 5 a) located in its outer end position with its outer side. The fourth roller 105 is then pushed into its inner end position, whereby the associated sealing ring section is pulled radially inward by the fourth roller 105 and folded over from a convex curvature into a concave curvature. As a result, the sealing ring 101 is bent over in a U-shaped manner on the two lateral rollers 102, 104 and on the fourth roller 105 in each case, in order to form a kidney-shaped sealing ring 101', the circumferential diameter of which is smaller than the outer diameter of the undeformed, circular sealing ring 101.In this known assembly principle, the deformation of the sealing ring thus takes place by radial compression by means of the displaced fourth deflection roller and by two lateral deflection rollers for defining the kidney-shaped contour. The deformation of a 3-point bend occurring in this case works against the natural (circle) resistance of the sealing ring, as a result of which this mounting principle is not suitable for sealing rings made of rigid / brittle materials.In contrast, the object of the present invention is to specify an alternative method for elastically deforming a circular sealing ring into a kidney shape, which is also suitable in particular for more rigid / brittle materials compared to the conventional method, and an associated sealing ring deformation device.This object is achieved according to the invention by a method having the following method steps:a) deforming the circular sealing ring into a waisted sealing ring having two mutually opposite end loops and a waist located therebetween having two mutually opposite waist portions by compressing two portions of the circular sealing ring until the two portions form the two waist portions; andb1) clamping the two waist sections to one another between a convex, in particular circular cylindrical deflecting element and a counter bearing element and bending the two loops around the convex deflecting element without relative displacement of the waist sections clamped to one another, in order to form a kidney-shaped sealing ring whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring; orb2) bending the one first loop around a convex, in particular circular cylindrical deflecting element, clamping the two waist sections to one another between the convex deflecting element and a counter bearing element, and bending the other second loop around the convex deflecting element without relative displacement of the waist sections clamped to one another, in order to form a kidney-shaped sealing ring whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring.According to the invention, the two waist sections of the waisted sealing ring are clamped against one another at the latest before the bending of the second loop, so that no relative movement of the two waist sections transversely to the clamping direction or in the longitudinal direction of the waisted sealing ring is possible. In particular in the case of sealing rings made of stiff / brittle materials, a relative movement of the two waist sections occurring during the bending of the loop(s) can make the sealing ring unusable.The method according to the invention offers in particular the following advantages:The convex deflection element enables a significantly larger bending radius, whereby sealing rings made of more rigid / brittle materials can be deformed into the kidney shape than in the conventional method.The bending of the two loops around the convex deflecting element is more material-saving than a 3-point bending against the circuit resistance of the sealing ring.The method variant b 2) allows the sealing ring a defined free space during the bending of the first loop and reduces the forced deformation.Experiments show a significant potential for a higher assembly / deformation speed for the method according to the invention than in the conventional method.Preferably, the two bent loops are each fixed by means of a fixing element arranged within the loop, in particular at its loop end facing away from the waist. Preferably, the kidney-shaped sealing ring is defined in its shape solely by the deflecting element and the fixing elements.Particularly preferably, in step a) the circular sealing ring is deformed to form the waisted sealing ring with two loops of different lengths, whereby the waist is not formed and clamped in the middle of the longitudinally deformed sealing ring, but eccentrically. The aspect ratio of the two loops of different lengths is advantageously between 2.5:1 and 1.5:1, in particular 2:1.Preferably, in steps b1) and b2), the convex deflecting element is moved in the direction towards the counter bearing element in order to clamp the waist sections therebetween. The counter bearing element can thus be arranged in a fixed position.In a preferred method variant, one or each of the two loops is bent around the convex deflecting element by the outer loop branch of the respective loop with respect to the convex deflecting element being pressed around the convex deflecting element by a pressure element engaging on the outside of the loop. The pressure element is movably mounted around the deflection element, for example, in a linear or arc shape.In another preferred method variant, one or each of the two loops is bent around the convex deflecting element by the inner loop branch or the free loop end of the respective loop facing away from the waist being pulled around the convex deflecting element by a tension element engaging on the inside of the loop. The tension element is movably mounted around the deflection element, for example, in a linear or arc shape. In an advantageous development of this method variant, in steps b1) and b2), a loop which is drawn around is guided with its outer loop branch along on the outside on a shaping contour which is concavely curved in particular in accordance with the desired outer contour of the kidney-shaped sealing ring. In particular, if the sealing ring does not have a symmetrical cross section, but rather differently profiled inner and outer sides, torsion of the sealing ring can thus be counteracted by bearing against the shaping contour.The invention also relates to a sealing ring deformation device for elastically deforming a circular sealing ring to a circumferential diameter which is smaller than the outer diameter of the undeformed circular sealing ring, having a convex, in particular circular cylindrical, deflecting element and a counter bearing element which are movable relative to one another in order to clamp a waist of the waist-deformed sealing ring therebetween, and having two compression or tension elements which are arranged on both sides of the convex deflecting element and are each movable between a starting position and an end position in order to bend two end-side loops of the waist-deformed sealing ring in kidney shape around the convex deflecting element.Preferably, the tension element is arranged within a loop of the waisted shaped sealing ring in order to pull the respective loop around the deflection element, and the pressure element is arranged outside a loop of the waisted shaped sealing ring in order to press the respective loop around the deflection element. A pressure side of the pressure element pressing onto the loop can advantageously be concave, in particular circular cylindrical, in design, which counteracts torsion of the sealing ring.In a particularly preferred embodiment, the counter bearing element is designed as a first lever which is mounted pivotably on one end on the housing side and, in a closed pivoted position, clamps the waist of the waistedly deformed sealing ring against the convex deflecting element. In an advantageous development of this embodiment, the pressure element can be designed as a second lever which is mounted pivotably at one end on the free end of the first lever and, in a closed pivoted position, presses the loop around the convex deflecting element.Preferably, the deflecting element and the tension element are fastened to a mounting plate which is rotatably mounted in a bearing opening of a bearing housing. Advantageously, the bearing housing can have a fixed circumferential wall which extends along a partial circumference of the mounting plate and the partially circular inner side of which extends the bearing opening upwards.Further advantages and advantageous embodiments of the subject matter of the invention can be derived from the description, the drawing and the claims. Likewise, the features mentioned above and those listed further below can be used individually or together in any desired combinations. The embodiments shown and described are not to be understood as a final enumeration, but merely have an exemplary character for describing the invention.The following are shown: FIGS. 1a-1e show the individual method steps of a first method according to the invention for elastically deforming a circular sealing ring into a kidney shape; FIGS. 2a-2f show the individual method steps of a second method according to the invention for elastically deforming a circular sealing ring into a kidney shape; FIG. 3 shows a sealing ring deforming device according to the invention for elastically deforming a circular sealing ring into a kidney shape; FIGS. 4a-4f show the individual method steps for elastically deforming a circular sealing ring into a kidney shape by means of the deflecting tool shown in FIG. 3; and FIGS. 5 a, 5 b show the individual method steps of a conventional method for elastically deforming a circular sealing ring into a kidney shape.FIGS. 1a-1e show the individual method steps of a method for elastically deforming a circular sealing ring 1 with an outer diameter D A into a kidney shape, the circumferential diameter D U of which is smaller than the outer diameter D A of the undeformed circular sealing ring 1.The circular sealing ring 1 shown in FIG. 1a is deformed radially inward into a waisted sealing ring 1' by pressing together two diametrically opposite sections 5a, 5b (FIG. 1b). The waisted sealing ring 1' has two mutually opposite end loops 2, 3 and a waist 4 therebetween with two mutually opposite waist sections 4a, 4b which are formed by the two compressed sections 5a, 5b.The two waist sections 4 a, 4 bare clamped together between a convex deflecting element 6, which is in this case circular cylindrical, and a counter bearing element 7 (FIG. 1 c ), as is indicated by the two arrows A. For this purpose, at least one of these two elements 6, 7 is moved in the direction of the other element in order to clamp the two waist sections 4 a, 4 bin between. The deflecting element 6 can be, for example, a fixed or a freely rotatably mounted roller. The counter bearing element 7 can be arranged, for example, in a fixed position, so that only the deflecting element 6 is moved.Subsequently, the two loops 2, 3 are bent around the deflecting element 6 without relative displacement of the waist sections 4 a, 4 b,which are clamped to one another (FIG. 1 d ), in order to form a kidney-shaped sealing ring 1" whose circumferential diameter D U is smaller than the outer diameter D A of the undeformed, circular sealing ring 1. The bending of the two loops 2, 3 around the deflecting element 6 takes place either by pressing the outer loop branch 9 of a loop 2, 3 with respect to the deflecting element 6 around the deflecting element 6 by a here pin-shaped pressure element 12 engaging on the outside of the loop, as is indicated by the arrow B, or by pulling the inner loop branch 10 with respect to the deflecting element 6 or the free loop end 11 of a loop 2, 3 facing away from the waist around the deflecting element 6 by a here pin-shaped tension element 13 arranged within the loop 2, 3, as is indicated by the arrow C. The compression and tension elements 12, 13 are movably mounted around the deflecting element 6, for example, in a linear or arc shape.Finally, a fixing element 8 is arranged within the bent loops 2, 3 in each case, said fixing element bearing against the free loop end 11 (FIG. 1 e ) in order to fix the loops 2, 3 in their bent-over shape and to further clamp the two waist sections 4 a, 4 atoward the deflecting element 6. If present, the tension element 13 can simultaneously also assume the function of the fixing element 8. The kidney-shaped sealing ring 1" is now fixed in its shape by the deflecting element 6 and the two fixing elements 8, but not also by the counter bearing element 7.FIGS. 2a-fe show the individual method steps of an alternative method for elastically deforming a circular sealing ring 1 with an outer diameter D A into a kidney shape, the circumferential diameter D U of which is smaller than the outer diameter D A of the undeformed circular sealing ring 1.The circular sealing ring 1 shown in FIG. 2a is deformed radially inward into a waisted sealing ring 1' by pressing together two diametrically opposite sections 5a, 5b (FIG. 2b). The waisted sealing ring 1' has two mutually opposite end loops 2, 3 and a waist 4 therebetween with two mutually opposite waist sections 4a, 4b which are formed by the two compressed sections 5a, 5b.The loop 3 on the right in FIG. 2 bis bent around a convex deflecting element 6, which is in this case circular cylindrical (FIG. 2 c ), and then the two waist sections 4 a, 4 bare clamped together between the deflecting element 6 and a counter bearing element 7 (FIG. 2 d ), as is indicated by the two arrows A. For this purpose, at least one of these two elements 6, 7 is moved in the direction of the other element in order to clamp the two waist sections 4 a, 4 bin between. The deflecting element 6 can be, for example, a fixed or a freely rotatably mounted roller. The counter bearing element 7 can be arranged, for example, in a fixed position, so that only the deflecting element 6 is moved.Subsequently, the left loop 2 is also bent around the deflection element 6 without relative displacement of the waist sections 4 a, 4 b,which are clamped to one another (FIG. 2 e ), in order to form a kidney-shaped sealing ring 1" whose circumferential diameter D U is smaller than the outer diameter D A of the undeformed, circular sealing ring 1. The bending of the two loops 2, 3 around the deflecting element 6 takes place either by pressing the outer loop branch 9 of a loop 2, 3 with respect to the deflecting element 6 around the deflecting element 6 by a pressure element 12 which engages on the outside of the loop and is in this case pin-shaped, as is indicated by arrows B, or by pulling the inner loop branch 10 with respect to the deflecting element 6 or the free loop end 11 of a loop 2, 3 facing away from the waist around the deflecting element 6 by a tension element 13 which engages on the inside of the loop, as is indicated by arrows C. The compression and tension elements 12, 13 are movably mounted around the deflecting element 6, for example, in a linear or arc shape.At the latest, a fixing element 8 is arranged within the bent loops 2, 3 in each case (FIG. 2 f) which bears against the free loop end 11 in order to fix the loops 2, 3 in their bent shape and to continue to clamp the two waist sections 4 a, 4 atoward the deflecting element 6. If present, the tension element 13 can simultaneously also assume the function of the fixing element 8. The kidney-shaped sealing ring 1" is now fixed in its shape by the deflecting element 6 and the two fixing elements 8, but not also by the counter bearing element 7.Instead of being pin-shaped, as shown in FIGS. 1 and 2, the pressure elements 12 can also extend along the outer loop branch 9 and be concavely curved corresponding to the desired outer contour of the kidney-shaped sealing ring 1".Instead of having the same length, as shown in FIGS. 1 and 2, the two loops 2, 3 can also be designed with different lengths, in that the waist 4 is not formed and clamped in the middle of the longitudinally deformed sealing ring 1, but rather eccentrically.The sealing ring deformation device 20 shown in FIG. 3 serves for elastically deforming a circular sealing ring 1 into a kidney shape and comprises a bearing housing 21, which is here circular in shape and in the bearing opening 22 of which a mounting plate 23, which is here circular, is mounted rotatably about an axis of rotation 24. On its upper side, the mounting plate 23 has a tension element 13 in the form of a small roller 25, a plug-in opening 26 diametrically opposite the small roller 25, here with respect to the axis of rotation 23, and a convex deflecting element 6 in the form of a large roller 27. The large roller 27 is arranged in the circumferential direction of the mounting plate 23 between the small roller 25 and the plug-in opening 26, namely in the present case closer to the small roller 24.Above the mounting plate 23, the bearing housing 21 has a fixed, here circular ring segment-shaped peripheral wall 28, which extends along a partial periphery of the mounting plate 23 and whose partial circular inner side (shaping contour) 29 extends the bearing opening 22 in the axial direction or upward. Adjoining the circumferential wall 28 is a first lever arm 30, which is in this case circular arc-shaped and is mounted on the bearing housing 21 such that it can be pivoted about an axis 31 parallel to the axis of rotation 24 and has a part-circular inner side 32. At the free end of the first lever arm 30, a pressure element 12 in the form of a second lever arm 33, which is in this case circular arc-shaped, is mounted such that it can be pivoted about an axis 34 parallel to the axis of rotation 24, which pressure element has a part-circular inner side (shaping contour) 35. The first lever arm 30 can, as in the present case, be shorter than the second lever arm 33. In their closed positions shown in FIG. 3, the two lever arms 30, 33 extend along a partial circumference of the mounting plate 23 and extend with their partially circular inner sides 32, 35 the bearing opening 22 in the axial direction or upward direction. The circumferential wall 28 and the closed lever arms 30, 33 extend over approximately 270° along the mounting plate 23, and the two lever arms 30, 33 can be pivoted outwards out of their closed positions into an open position, respectively, as is shown in FIG. 4 c.The individual method steps for elastically deforming a circular sealing ring 1 by means of the sealing ring deformation device 20 into a kidney shape, the circumferential diameter of which is smaller than the outer diameter of the undeformed circular sealing ring 1, will be described below.FIG. 4 ashows the circular sealing ring 1 with an outer diameter D A.The sealing ring 1' can optionally be pre-shaped by elastic compression into an elongated pear shape with a narrow and a wide loop 2, 3 (FIG. 4b). Preferably, the wide loop 3 is about twice as long as the narrow loop 2.The lever arms 30, 33 are opened and the mounting plate 23 is rotated in the bearing housing 21 until the small roller 25 is at the level of the end of the circumferential wall 28 facing the lever. Then the prefabricated sealing ring 1' is laid with its narrow loop 2 around the small roller 25 (FIG. 4c), whereby the wide loop 3 protrudes outwards from the bearing housing 21. The mounting plate 23 in the bearing housing 21 is then rotated clockwise by approximately 45°, whereby the narrow loop 2 is pulled along by the small roller 5 and the narrow loop 2 is thereby bent around the large roller 27 (FIG. 4 d). The outer loop branch 9 of the narrow loop 2 is guided along the part-circular inner side 29 of the circumferential wall 28 and bears against it. A waist is formed between the two loops 2, 3 with two mutually opposite waist sections 4 a, 4 b. The small roller 25 forms a fixing member 8 that fixes the narrow loop 2.The first lever arm 30 is pivoted inwardly to its closed position and fixed in this position, whereby the two waist portions 4a, 4b are clamped together between the large roller 27 and the first lever arm 30 (Fig. 4e).Then, the second lever arm 33 is also pivoted inwardly to its closed position and fixed in this position, whereby the wide loop 3 is pressed around the large roller 27 without relative displacement of the waist portions 4a, 4b clamped together. The outer loop branch 9 of the wide loop 3 abuts the part-circular inner side 35 of the second lever 33. Finally, the bent wide loop 3 is fixed by means of a fixing element 8, here in the form of a small roller 36, inserted into the plug-in opening 26 (FIG. 4 f ).The resulting kidney-shaped sealing ring 1" has a circumferential diameter which corresponds to the opening diameter of the bearing opening 22 and is smaller than the outer diameter D A of the undeformed, circular sealing ring 1.The guidance or contact of the sealing ring 1 on the part-circular inner sides 29, 32, 35 counteracts torsion of the sealing ring 1, in particular if the sealing ring does not have a symmetrical cross section but rather differently profiled inner and outer sides.Instead of the two lever arms shown, only a single lever arm, which takes over both the clamping and the bending, or even a plurality of second lever arms for the successive bending of a loop are also conceivable.For mounting the kidney-shaped sealing ring 1" in an internal annular groove of a machine part opening, the two levers 30, 33 are opened. The mounting plate 23 together with the sealing ring 1" is removed from the bearing housing 21 and positioned within the machine part opening. Then the large roller 27 is removed from the mounting plate 23 and the sealing ring 1" is thereby released, which, due to its inherent elasticity, relaxes into the original circular shape and at the same time automatically positions itself in the annular groove.

Claims

Method for elastically deforming a circular sealing ring (1) to a circumferential diameter (D U), which is smaller than the outer diameter (D A) of the undeformed circular sealing ring (1), characterized bythe following method steps: b) deforming the circular sealing ring (1) to form a waisted sealing ring (1') having two mutually opposite end-side loops (2, 3) and a waist (4) located therebetween having two mutually opposite waist sections (4a, 4b) by pressing together two sections (5a, 5b) of the circular sealing ring (1) until the two sections (5a, 5b) form the two waist sections (4a, 4b); and b1) clamping the two waist sections (4a, 4b) to one another between a convex, in particular circular cylindrical deflecting element (6) and a counter-bearing element (7) and bending the two loops (2, 3) around the convex deflecting element (6) without relative displacement of the waist sections (4a, 4b) clamped to one another, in order to form a kidney-shaped sealing ring (1''), the circumferential diameter (D U) of which is smaller than the outer diameter (D A) of the non-deformed, circular sealing ring (1); or b2) bending the one, first loop (2) around a convex, in particular circular cylindrical deflecting element (6), clamping the two waist sections (4a, 4b) to one another between the convex deflecting element (6) and a counter-bearing element (7) and bending the other, second loop (3) around the convex deflecting element (6) without relative displacement of the waist sections (4a, 4b) clamped to one another, in order to form a kidney-shaped sealing ring (1"), the circumferential diameter (D U) of which is smaller than the outer diameter (D A) of the undeformed, circular sealing ring (1).Method according to claim 1, characterised in that the two bent loops (2, 3) are each fixed by means of a fixing element (8) arranged within the loop, in particular at its loop end (11) facing away from the waist.Method according to claim 1 or 2, characterised in that in step a) the circular sealing ring (1) is deformed to form the waisted sealing ring (1') with two loops (2, 3) of different lengths.Method according to claim 3, characterised in that the aspect ratio of the two loops (2, 3) of different lengths is between 2.5:1 and 1.5:1, in particular 2:1.Method according to any of the preceding claims, characterized in that in steps b1) and b2) the convex deflecting element (6) is moved towards the counter bearing element (7) in order to clamp the waist sections (4a, 4b) therebetween.Method according to one of the preceding claims, characterized in that one or each of the two loops (2, 3) is bent around the convex deflecting element (6) by the outer loop branch (9) of the respective loop with respect to the convex deflecting element (6) being pressed around the convex deflecting element (6) by a pressure element (12) which engages on the outside of the loop (2, 3).Method according to one of the preceding claims, characterized in that one or each of the two loops (2, 3) is bent around the convex deflecting element (6) by the inner loop branch (10), relative to the convex deflecting element (6), or the free loop end (11), facing away from the waist, of the respective loop being pulled around the convex deflecting element (6) by a tension element (13), which engages on the inside of the loop (2, 3).Method according to claim 7, characterised in that in steps b1) and b2) a loop (2, 3) which is drawn around is guided with its outer loop branch (9) on the outside along a shaping contour (29, 35) which is in particular concavely curved corresponding to the desired outer contour of the kidney-shaped sealing ring (1").Sealing ring deformation device (20) for elastically deforming a circular sealing ring (1) to a circumferential diameter (D U), which is smaller than the outer diameter (D A) of the undeformed circular sealing ring (1), in particular for carrying out the method according to one of the preceding claims, having: - a convex, in particular circular cylindrical deflecting element (6) and a counter bearing element (7) which are movable relative to one another in order to clamp a waist (4) of the waistedly deformed sealing ring (1') therebetween, and - two compression or tension elements (12, 13) which are arranged on both sides of the convex deflecting element (6) and are each movable between an initial position and an end position, around two end loops (2, 3) of the waistedly deformed sealing ring (1') to be bent over in kidney shape around the convex deflection element (6).Sealing ring deformation device according to claim 9, characterised in that the deflecting element (6) is formed as a roller (27).Sealing ring deformation device according to claim 9 or 10, characterised in that the tension element (13) is arranged within a loop (2, 3) of the waistedly deformed sealing ring (1') in order to pull the respective loop around the deflection element (6).Sealing ring deformation device according to claim 11, characterised in that the tension element (13) is formed as a roller (25).Sealing ring deformation device according to one of Claims 9 to 12, characterized in that the pressure element (12) is arranged outside a loop (2, 3) of the tail-deformed sealing ring (1') in order to press the respective loop around the deflecting element (6).Sealing ring deformation device according to claim 13, characterised in that a pressure side of the pressure element (13) pressing onto the loop (2, 3) is concave, in particular circular cylindrical.Sealing ring deformation device according to one of Claims 9 to 14, characterized in that the counter-bearing element (7) is designed as a first lever (30) which is mounted pivotably on the housing side at one end and, in a closed pivoted position, clamps the waist (4) of the sealing ring (1') which is shaped waisted against the convex deflecting element (6).Sealing ring deformation device according to claim 15, characterised in that the pressure element (13) is formed as a second lever (33), which is pivotably mounted at one end on the free end of the first lever (30) and, in a closed pivoted position, presses the loop (2, 3) around the convex deflecting element (6).Sealing ring deformation device according to one of claims 10 to 16, characterised in that the deflecting element (6) and the tension element (13) are fastened to a mounting plate (23) which is rotatably mounted in a bearing opening (22) of a bearing housing (21).Sealing ring deformation device according to claim 17, characterised in that the bearing housing (21) has a fixed circumferential wall (28) which extends along a partial circumference of the mounting plate (23) and whose part-circular inner side (29) extends the bearing opening (22) in the axial direction.

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