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

Abstract

The invention relates to a method for elastically deforming a circular sealing ring (1) to a circumscribed-circle diameter (DU) which is smaller than the outer diameter (DA) of the undeformed, circular sealing ring (1), comprising the following method steps: deforming the circular sealing ring (1) to form a waisted sealing ring (1') having two opposing end loops (2, 3) and a waist (4) therebetween having two opposing waist portions (4a, 4b) by pressing two portions (5a, 5b) of the circular sealing ring (1) together until the two portions (5a, 5b) form the two waist portions (4a, 4b); and clamping the two waist portions (4a, 4b) against one another between a convex deflection element (6) and a counter bearing element (7) and bending the two loops (2, 3) around the convex deflection element (6) without relative displacement of the waist portions (4a, 4b) clamped against one another in order to form a kidney-shaped sealing ring (1''), the circumscribed-circle diameter (DU) of which is smaller than the outer diameter (DA) of the undeformed, circular sealing ring (1).

Description

[0001] Method for elastically deforming a circular sealing ring into a kidney shape and associated sealing ring deformation device

[0002] The present invention relates to a method for elastically deforming a circular sealing ring to a circumferential diameter that is smaller than the outer diameter of the undeformed, circular sealing ring, as well as to an associated sealing ring deformation device. To insert a circular seal into an internal annular groove of an opening, the circular seal must first be elastically deformed to a circumferential diameter that is smaller than the opening diameter. Once the deformed seal is positioned within the opening, the sealing ring is released, allowing it to relax into its original circular shape due to its inherent elasticity and thereby automatically settle into the annular groove.

[0003] Figs. 5a and 5b show a conventional sealing ring deformation device 100 for elastically deforming a circular sealing ring 101 into a kidney shape, the circumference diameter of which is smaller than the outer diameter of the undeformed, circular sealing ring 101. The sealing ring deformation device 100 has four rollers 102-105, of which three rollers 102-14 are arranged stationary along their circumference at 3, 6, and 9 o'clock. A fourth roller, in its outer end position shown in Fig. 5a, touches the circumference on the inside at 0 o'clock and is mounted so as to be displaceable radially inward beyond the circumference center in the direction of the central roller 103 in the direction of the double arrow.

[0004] A circular sealing ring 101, whose inner diameter is equal to or slightly larger than the circumferential diameter, is inserted into the sealing ring deformation device 100 and its inner side is tangent to the three rollers 102-104 and its outer side is tangent to the fourth roller 105, which is in its outer end position (Fig. 5a). 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 from a convex to a concave curvature. As a result, the sealing ring 101 is bent into a U-shape at the two lateral rollers 102, 104 and at the fourth roller 105 in order to form a kidney-shaped sealing ring 101' whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring 101.

[0005] With this well-known assembly principle, the sealing ring is deformed by radial compression using the displaced fourth deflection roller and two lateral deflection rollers to define the kidney-shaped contour. The resulting deformation of a three-point bend works against the natural (circular) resistance of the sealing ring, making this assembly principle unsuitable for sealing rings made of stiff / brittle materials.

[0006] In contrast, the present invention is based on the object of providing both an alternative method for elastically deforming a circular sealing ring into a kidney shape, which is particularly suitable for stiffer / brittle materials compared to the conventional method, as well as an associated sealing ring deformation device.

[0007] 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 with two opposing end loops and a waist located therebetween with two opposing waist sections by pressing two sections of the circular sealing ring together until the two sections form the two waist sections; and b1) clamping the two waist sections to one another between a convex, in particular circular-cylindrical, deflection element and a counter-bearing element and bending the two loops around the convex deflection element without relative displacement of the clamped waist sections 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;or b2) bending the one, first loop around a convex, in particular circular-cylindrical, deflection element, clamping the two waist sections to one another between the convex deflection element and a counter-bearing element and bending the other, second loop around the convex deflection element without relative displacement of the clamped waist sections to form a kidney-shaped sealing ring whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring;

[0008] According to the invention, the two waist sections of the tapered sealing ring are clamped against each other at the latest before the second loop is bent, preventing any relative movement of the two waist sections transverse to the clamping direction or in the longitudinal direction of the tapered sealing ring. Particularly with sealing rings made of stiff / brittle materials, relative movement of the two waist sections occurring when bending the loop(s) can render the sealing ring unusable.

[0009] The method according to the invention offers in particular the following advantages:

[0010] - The convex deflection element enables a significantly larger bending radius, which means that sealing rings made of stiffer / brittle materials can be deformed into the kidney shape than with the conventional process.

[0011] - Bending the two loops around the convex deflection element is more gentle on the material than a 3-point bend against the circular resistance of the sealing ring.

[0012] - The process variant b2) allows the sealing ring a defined clearance when bending the first loop and reduces the forced deformation.

[0013] - Tests show clear potential for a higher assembly Z deformation speed for the inventive method than for the conventional method.

[0014] Preferably, the two bent loops are each secured by means of a fixing element arranged within the loop, in particular at the end of the loop facing away from the waist. The shape of the kidney-shaped sealing ring is preferably determined solely by the deflection element and the fixing elements.

[0015] Particularly preferably, in step a), the circular sealing ring is deformed into the waisted sealing ring with two loops of different lengths, whereby the waist is formed and clamped eccentrically rather than in the center of the elongated, deformed sealing ring. The length ratio of the two loops of different lengths is advantageously between 2.5 to 1 and 1.5 to 1, in particular 2 to 1. Preferably, in steps b1) and b2), the convex deflection element is moved toward the counter-bearing element in order to clamp the waist sections therebetween. The counter-bearing element can thus be arranged in a stationary manner.

[0016] In a preferred method variant, one or each of the two loops is bent around the convex deflection element by the outer loop branch of the respective loop being pressed around the convex deflection element by a pressure element acting on the outside of the loop. The pressure element is mounted for movement around the deflection element, for example, in a linear or arcuate manner.

[0017] In another preferred method variant, one or each of the two loops is bent around the convex deflection element by the inner loop branch with respect to the convex deflection element or the free loop end of the respective loop facing away from the waist being pulled around the convex deflection element by a tension element acting on the inside of the loop. The tension element is mounted so as to be movable, for example, linearly or in an arc around the deflection element. In an advantageous development of this method variant, in steps b1) and b2), a loop that has been pulled around is guided with its outer loop branch along a shaping contour on the outside, which is concavely curved in particular according to the desired outer contour of the kidney-shaped sealing ring.In particular, if the sealing ring does not have a symmetrical cross-section but differently profiled inner and outer sides, torsion of the sealing ring can be counteracted by contact with the shaping contour.

[0018] 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, with a convex, in particular circular-cylindrical, deflection element and a counter-bearing element which are movable relative to one another in order to clamp a waist of the waisted deformed sealing ring therebetween, and with two pressure or tension elements arranged on both sides of the convex deflection element, which are each movable between an initial and an end position in order to bend two end loops of the waisted deformed sealing ring in a kidney shape around the convex deflection element.

[0019] Preferably, the tension element is arranged within a loop of the tapered sealing ring to pull the respective loop around the deflecting element, and the pressure element is arranged outside a loop of the tapered sealing ring to press the respective loop around the deflecting element. A pressure side of the pressure element pressing on the loop can advantageously be concave, in particular circularly cylindrical, which counteracts torsion of the sealing ring.

[0020] In a particularly preferred embodiment, the counter-bearing element is designed as a first lever, which is pivotally mounted at one end on the housing side and, in a closed pivot position, clamps the waist of the tapered sealing ring against the convex deflection element. In an advantageous further development of this embodiment, the pressure element can be designed as a second lever, which is pivotally mounted at one end on the free end of the first lever and, in a closed pivot position, presses the loop around the convex deflection element.

[0021] Preferably, the deflection element and the tension element are attached to a mounting plate that is rotatably mounted in a bearing opening of a bearing housing. Advantageously, the bearing housing can have a fixed peripheral wall that extends along a partial circumference of the mounting plate and whose partially circular inner side extends the bearing opening upward.

[0022] Further advantages and advantageous embodiments of the subject matter of the invention can be found in the description, the drawings, and the claims. Likewise, the above-mentioned and further listed features can be used individually or in combination. The embodiments shown and described are not to be understood as an exhaustive list, but merely as examples for describing the invention. They show:

[0023] Figs. 1 a-1 e show the individual process steps of a first inventive

[0024] Method for elastically deforming a circular sealing ring into a kidney shape;

[0025] Fign. 2a-2f the individual process steps of a second process according to the invention for elastically deforming a circular

[0026] sealing ring into a kidney shape;

[0027] Fig. 3 shows a sealing ring deformation device according to the invention for elastically deforming a circular sealing ring into a kidney shape;

[0028] Figs. 4a-4f show the individual process steps for elastically deforming a circular sealing ring into a kidney shape using the deflection tool shown in Fig. 3; and

[0029] Figs. 5a, 5b show the individual process steps of a conventional process for elastically deforming a circular sealing ring into a kidney shape.

[0030] Figs. 1a-1e show the individual process steps of a process for elastically deforming a circular sealing ring 1 with outer diameter DA into a kidney shape, the circumferential diameter Du of which is smaller than the outer diameter DA of the undeformed, circular sealing ring 1.

[0031] The circular sealing ring 1 shown in Fig. 1a is deformed into a tapered sealing ring 1' by compressing two diametrically opposed sections 5a, 5b radially inward (Fig. 1b). The tapered sealing ring T has two opposing end loops 2, 3 and, between them, a waist 4 with two opposing waist sections 4a, 4b, which are formed by the two compressed sections 5a, 5b.

[0032] The two waist sections 4a, 4b are clamped together between a convex, here circular-cylindrical deflection element 6 and a counter-bearing element 7 (Fig. 1c), as indicated by the two arrows A. For this purpose, at least one of these two elements 6, 7 is moved toward the other element to clamp the two waist sections 4a, 4b therebetween. The deflection element 6 can, for example, be a fixed or freely rotatable roller. The counter-bearing element 7 can, for example, be arranged in a fixed position so that only the deflection element 6 is moved.

[0033] Subsequently, the two loops 2, 3 are bent around the deflection element 6 without relative displacement of the clamped waist sections 4a, 4b (Fig. 1d) in order to form a kidney-shaped seal 1" whose circumferential diameter Du is smaller than the outer diameter DA of the undeformed, circular sealing ring 1. The bending of the two loops 2, 3 around the deflection element 6 takes place by either the outer loop branch 9 of a loop 2, 3 with respect to the deflection element 6 being pressed around the deflection element 6 by a pin-shaped pressure element 12 acting on the outside of the loop, as indicated by the arrow B, or by the inner loop branch 10 with respect to the deflection element 6 or the free loop end 11 of a loop 2, 3 facing away from the waist being pressed by a pressure element 12 inside the loop 2, 3 arranged, here pin-shaped pulling element 13 is pulled around the deflection element 6, as indicated by the arrow C.The pressure and tension elements 12, 13 are mounted, for example, linearly or arcuately movable around the deflection element 6.

[0034] Finally, a fixing element 8 is arranged within each of the bent loops 2, 3, resting against the free loop end 11 (Fig. 1 e), in order to fix the loops 2, 3 in their bent shape and to continue to clamp the two waist sections 4a, 4a against the deflection element 6. If present, the tension element 13 can simultaneously also take on the function of the fixing element 8. The kidney-shaped sealing ring 1" is now fixed in its shape by the deflection element 6 and the two fixing elements 8, but not also by the counter-bearing element 7. Figs. 2a-2f show the individual method steps of an alternative method for the elastic deformation of a circular sealing ring 1 with an outer diameter DA into a kidney shape, the circumferential diameter Du of which is smaller than the outer diameter DA of the undeformed, circular sealing ring 1.

[0035] The circular seal 1 shown in Fig. 2a is deformed into a tapered seal T by compressing two diametrically opposed sections 5a, 5b radially inward (Fig. 2b). The tapered seal T has two opposing end loops 2, 3 and, between them, a waist 4 with two opposing waist sections 4a, 4b, which are formed by the two compressed sections 5a, 5b.

[0036] The right-hand loop 3 in Fig. 2b is bent around a convex, here circular-cylindrical, deflection element 6 (Fig. 2c), and then the two waist sections 4a, 4b are clamped together between the deflection element 6 and a counter-bearing element 7 (Fig. 2d), as indicated by the two arrows A. For this purpose, at least one of these two elements 6, 7 is moved towards the other element in order to clamp the two waist sections 4a, 4b therebetween. The deflection element 6 can, for example, be a fixed or freely rotatable roller. The counter-bearing element 7 can, for example, be arranged in a stationary manner so that only the deflection element 6 is moved.

[0037] Subsequently, the left loop 2 is also bent around the deflection element 6 without relative displacement of the clamped waist sections 4a, 4b (Fig. 2e) in order to form a kidney-shaped seal 1" whose circumferential diameter Du is smaller than the outer diameter DA of the undeformed, circular sealing ring 1. The bending of the two loops 2, 3 around the deflection element 6 takes place by either the outer loop branch 9 of a loop 2, 3 with respect to the deflection element 6 being pressed around the deflection element 6 by a pin-shaped pressure element 12 acting on the outside of the loop, as indicated by arrows B, or by the inner loop branch 10 with respect to the deflection element 6 or the free loop end 11 of a loop 2, 3 facing away from the waist being pressed by a acting pulling element 13 is pulled around the deflection element 6, as indicated by arrows C.The pressure and tension elements 12, 13 are mounted, for example, linearly or arcuately movable around the deflection element 6.

[0038] At this point at the latest, a fixing element 8 is arranged within each of the bent loops 2, 3, resting against the free loop end 11 (Fig. 2f), in order to fix the loops 2, 3 in their bent shape and to continue to clamp the two waist sections 4a, 4a against the deflection element 6. If present, the tension element 13 can simultaneously also assume the function of the fixing element 8. The kidney-shaped seal 1" is now fixed in its shape by the deflection element 6 and the two fixing elements 8, but not also by the counter-bearing element 7.

[0039] 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 according to the desired outer contour of the kidney-shaped sealing ring 1".

[0040] Instead of being of equal length, as shown in Figs. 1 and 2, the two loops 2, 3 can also be of different lengths by forming and clamping the waist 4 not in the middle of the elongated sealing ring 1, but off-center.

[0041] The sealing ring deformation device 20 shown in Fig. 3 serves to elastically deform a circular sealing ring 1 into a kidney shape and comprises a bearing housing 21, here in the shape of a ring, in the bearing opening 22 of which a circular mounting plate 23 is mounted so as to be rotatable about a rotation axis 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 located diametrically opposite the small roller 25, here with respect to the rotation axis 23, and a convex deflection 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, in this case closer to the small roller 24. The rollers 25, 27 can be freely rotatably mounted or fixed.

[0042] 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 circumference of the mounting plate 23 and whose partially circular inner side (shaping contour) 29 extends the bearing opening 22 in the axial direction or upwards. Adjacent to the peripheral wall 28 is a first lever arm 30, here in the shape of a circular arc, which is pivotally mounted on the bearing housing 21 about an axis 31 parallel to the axis of rotation 24 and has a partially 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, here in the shape of a circular arc, is pivotally mounted about an axis 34 parallel to the axis of rotation 24 and has a partially 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 Fig.In the closed positions shown in Fig. 3, the two lever arms 30, 33 extend along a partial circumference of the mounting plate 23 and, with their partially circular inner sides 32, 35, extend the bearing opening 22 in the axial direction or upwards. The peripheral wall 28 and the closed lever arms 30, 33 extend approximately 270° along the mounting plate 23. The two lever arms 30, 33 can each be pivoted outward from their closed positions into an open position, as shown in Fig. 4c.

[0043] 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 whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring 1 are described below.

[0044] Fig. 4a shows the circular sealing ring 1 with outer diameter DA.

[0045] The sealing ring T can optionally be pre-formed—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 approximately 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 level with the end of the peripheral wall 28 facing the lever. Then, the pre-formed sealing ring 1' with its narrow loop 2 is placed around the small roller 25 (Fig. 4c), with the wide loop 3 protruding outward from the bearing housing 21. The mounting plate 23 is then rotated clockwise by approximately 45° in the bearing housing 21, 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. 4d).The outer loop branch 9 of the narrow loop 2 is guided along the partially circular inner side 29 of the peripheral wall 28 and rests against it. A waist with two opposing waist sections 4a, 4b is formed between the two loops 2, 3. The small roller 25 forms a fixing element 8 that secures the narrow loop 2.

[0046] The first lever arm 30 is pivoted inwards into its closed position and fixed in this position, whereby the two waist sections 4a, 4b are clamped together between the large roller 27 and the first lever arm 30 (Fig. 4e).

[0047] Then, the second lever arm 33 is also pivoted inward into 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 clamped waist sections 4a, 4b. The outer loop branch 9 of the wide loop 3 rests against the partially 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. 4f).

[0048] The resulting kidney-shaped seal 1" has a circumferential diameter which corresponds to the opening diameter of the bearing opening 22 and is smaller than the outer diameter DA of the undeformed, circular sealing ring 1.

[0049] The guidance or contact of the sealing ring 1 on the partially circular inner sides 29, 32, 35 counteracts torsion of the sealing ring 1, particularly when 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, a single lever arm that handles both clamping and bending, or several second lever arms for successively bending a loop, are also conceivable. To install 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 thereby the sealing ring 1" is released, which relaxes into its original circular shape due to its inherent elasticity and thereby automatically fits into the annular groove.

Claims

Patent claims 1 . 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 ), characterized by the following method steps: a) deforming the circular sealing ring (1 ) to form a waisted sealing ring (T) 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);and b1) clamping the two waist sections (4a, 4b) to one another between a convex, in particular circular-cylindrical, deflection element (6) and a counter-bearing element (7) and bending the two loops (2, 3) around the convex deflection element (6) without relative displacement of the clamped waist sections (4a, 4b) to form a kidney-shaped sealing ring (1"), the circumferential diameter (Du) of which is smaller than the outer diameter (DA) of the undeformed, circular sealing ring (1);or b2) bending the one, first loop (2) around a convex, in particular circular-cylindrical, deflection element (6), clamping the two waist sections (4a, 4b) to one another between the convex deflection element (6) and a counter-bearing element (7) and bending the other, second loop (3) around the convex deflection element (6) without relative displacement of the clamped waist sections (4a, 4b) to one another, in order to form a kidney-shaped sealing ring (1"), the circumferential diameter (Du) of which is smaller than the outer diameter (DA) of the undeformed, circular sealing ring (1); 2. Method according to claim 1, characterized in that the two bent loops (2, 3) are each fixed by means of a fixing element (8) arranged inside the loop, in particular at the loop end (11) facing away from the waist.

3. Method according to claim 1 or 2, characterized in that in step a) the circular seal (1) is deformed into the waisted seal (T) with two loops (2, 3) of different lengths.

4. Method according to claim 3, characterized in that the length ratio of the two loops (2, 3) of different lengths is between 2.5 to 1 and 1.5 to 1, in particular 2 to 1.

5. Method according to one of the preceding claims, characterized in that in steps b1) and b2) the convex deflection element (6) is moved in the direction towards the counter-bearing element (7) in order to clamp the waist sections (4a, 4b) therebetween.

6. 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) in that the outer loop branch (9) of the respective loop with respect to the convex deflecting element (6) is pressed around the convex deflecting element (6) by a pressure element (12) acting on the outside of the loop (2, 3).

7. 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 deflection element (6) in that the inner loop branch (10) with respect to the convex deflection element (6) or the free loop end (11) of the respective loop facing away from the waist is pulled around the convex deflection element (6) by a pulling element (13) acting on the inside of the loop (2, 3).

8. Method according to claim 7, characterized in that in steps b1) and b2) a loop (2, 3) which is pulled around is guided with its outer loop branch (9) on the outside along a shaping contour (29, 35) which is concavely curved in particular in accordance with the desired outer contour of the kidney-shaped sealing ring (1").

9. Sealing ring deformation device (20) 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), in particular for carrying out the method according to one of the preceding claims, comprising: - a convex, in particular circular-cylindrical deflection element (6) and a counter-bearing element (7), which are movable relative to one another in order to clamp a waist (4) of the waisted sealing ring (T) therebetween, and - two pressure or tension elements (12, 13) arranged on both sides of the convex deflection element (6), each of which is movable between an initial position and an end position in order to bend two end loops (2, 3) of the waisted sealing ring (T) in a kidney shape around the convex deflection element (6).

10. Sealing ring deformation device according to claim 9, characterized in that the deflection element (6) is designed as a roller (27).

11. Sealing ring deformation device according to claim 9 or 10, characterized in that the pulling element (13) is arranged within a loop (2, 3) of the waisted deformed sealing ring (T) in order to pull the respective loop around the deflecting element (6).

12. Sealing ring deformation device according to claim 11, characterized in that the tension element (13) is designed as a roller (25).

13. Sealing ring deformation device according to one of claims 9 to 12, characterized in that the pressure element (12) is outside a Loop (2, 3) of the waisted sealing ring (T) is arranged to press the respective loop around the deflection element (6).

14. Sealing ring deformation device according to claim 13, characterized in that a pressure side of the pressure element (13) pressing on the loop (2, 3) is concave, in particular circular-cylindrical.

15. 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 pivotally mounted at one end on the housing side and, in a closed pivot position, clamps the waist (4) of the waisted deformed sealing ring (T) against the convex deflection element (6).

16. Sealing ring deformation device according to claim 15, characterized in that the pressure element (13) is designed as a second lever (33) which is pivotally mounted at one end on the free end of the first lever (30) and, in a closed pivot position, presses the loop (2, 3) around the convex deflection element (6).

17. Sealing ring deformation device according to one of claims 10 to 16, characterized in that the deflection 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).

18. Sealing ring deformation device according to claim 17, characterized in that the bearing housing (21) has a fixed peripheral wall (28) which extends along a partial circumference of the mounting plate (23) and whose partially circular inner side (29) extends the bearing opening (22) in the axial direction.

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