Treatment chair for bone setting of rat with cervical spondylotic radiculopathy

Abstract

The utility model discloses a treatment chair for bone setting of a rat with cervical spondylotic radiculopathy, which belongs to the technical field of medical instruments and comprises a bottom plate, a side plate is fixedly mounted on the bottom plate, a lifting component, a fixing component and an auxiliary component are arranged on the side plate, and the neck and the waist of the rat can be accurately fixed by the aid of the fixing component and the auxiliary component. The device is suitable for rats with different body types and illness states, the stability and effect in the bonesetting treatment process are ensured, the lifting assembly is arranged, the rotary lifting bonesetting technique that the head of the rat is rotated and then lifted can be achieved, and the receding sliding plate is arranged, so that the situation that the rat is hurt when the lifting force of the rat exceeds the rated force can be effectively prevented; by arranging the friction ring plate, the positions of all the arc-shaped strip blocks can be locked, the arc-shaped strip blocks are prevented from moving in the treatment process, and therefore the stability and safety of the device are improved, modular arrangement is adopted as a whole, and disassembly and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a treatment chair for bone setting in rats with cervical radiculopathy. Background Technology

[0002] In medical research and treatment, osteopathic treatment of rats with cervical radiculopathy has always been an important and complex field. Traditional osteopathic methods often lack effective fixation devices, making it difficult to ensure the stability of the rats during treatment, thus affecting the osteopathic effect. Furthermore, existing treatment equipment usually cannot accurately simulate the doctor's rotational and lifting osteopathic techniques, which greatly reduces the treatment effect. It also cannot adjust the position of the rats on the chair according to different ages and sizes of rats, thus failing to effectively reduce the stress response during treatment. Therefore, this utility model provides a treatment chair for osteopathic treatment of rats with cervical radiculopathy. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a treatment chair for bone setting in rats with cervical spondylosis of the nerve root type. It overcomes the problems of not being able to accurately simulate the doctor's rotation and lifting bone setting techniques, and not being able to adjust the position of the rat on the chair according to different age groups and body sizes.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a treatment chair for bone setting in rats with cervical spondylosis of the nerve root type, comprising a base plate, a side plate fixedly mounted on the base plate, and a lifting component, a fixing component, and an auxiliary component provided on the side plate. The lifting component includes a lifting ring plate slidably mounted on the side plate, and a first fixing ring plate movably mounted on the lifting ring plate. Both the fixing component and the auxiliary component include a second fixing ring plate. Six adjusting racks are slidably mounted in a circumferential array on both the first and second fixing ring plates. An arc-shaped strip is fixedly provided at the end of each adjusting rack closest to the axis of the second fixing ring plate. Adjusting toothed rings are rotatably mounted on both the first and second fixing ring plates. The adjusting toothed rings are used to adjust the position of the corresponding adjusting racks. Friction ring plates are slidably mounted on both the first and second fixing ring plates. When the friction ring plate and the corresponding arc-shaped strip are engaged, there is friction between them. The friction ring plate is used to limit the rotation of the adjusting toothed ring.

[0005] Furthermore, the second fixing ring plate in the fixing assembly is fixedly installed on the side plate, and the second fixing ring plate in the auxiliary assembly is slidably installed on the side plate. The axes of the first fixing ring plate and the second fixing ring plate are on the same straight line. The second fixing ring plate in the fixing assembly is located between the first fixing ring plate and the second fixing ring plate in the auxiliary assembly, and the first fixing ring plate is located directly above the second fixing ring plate in the fixing assembly.

[0006] Furthermore, a support circular plate is slidably mounted on the side plate. The support circular plate is located directly below the fixed ring plate two in the auxiliary assembly. A support screw and an auxiliary screw are rotatably mounted on the side plate. The support screw and the support circular plate form a screw pair, and the auxiliary screw and the fixed ring plate two in the auxiliary assembly form a screw pair.

[0007] Furthermore, a clearance slide plate is slidably installed on the side plate, and the clearance slide plate and the lifting ring plate slide together. A pressure regulating slide plate is also slidably installed on the outer side of the lifting ring plate. A spring is provided between the pressure regulating slide plate and the clearance slide plate. A pressure regulating electric cylinder is also fixedly installed on the lifting ring plate, and the piston rod end of the pressure regulating electric cylinder is fixedly connected to the pressure regulating slide plate.

[0008] Furthermore, a displacement ring plate is also fixedly installed on the outer side of the fixed ring plate. The displacement ring plate is rotatably mounted on the lifting ring plate, and the axes of the displacement ring plate and the lifting ring plate are on the same straight line.

[0009] Furthermore, six adjusting gears are rotatably mounted on both the lifting ring plate and the fixed ring plate. Each adjusting gear forms a gear-rack pair with its corresponding adjusting rack. A transmission gear is fixedly mounted on each adjusting gear, and the transmission gear and its corresponding adjusting gear ring form a gear pair.

[0010] Furthermore, both the first and second fixed ring plates are rotatably mounted with drive gears and adjusting screws. The drive gears and adjusting gear rings form a gear pair, and the drive gears and corresponding adjusting screws are rotatably connected. Adjusting spline shafts are rotatably mounted on the friction ring plates. The adjusting spline shafts and corresponding drive gears form a spline sliding fit, and the adjusting spline shafts and adjusting screws form a helical pair.

[0011] Furthermore, a torsion spring is provided between the drive gear and the corresponding adjusting screw, and springs are provided between the first fixed ring plate and the second fixed ring plate and the corresponding friction ring plate.

[0012] The advantages of this utility model compared with the prior art are: (1) By setting a fixing component and an auxiliary component, this utility model can accurately fix the neck and waist of the rat, adapt to rats of different body sizes and conditions, and ensure the stability and effect of the bone setting treatment process. (2) By setting a lifting component, this utility model can realize the rotation and lifting bone setting technique of first rotating and then lifting the head of the rat, and by setting a clearance slide, it can effectively prevent the rat from being injured when the lifting force exceeds the rated force. (3) By setting a friction ring plate, this utility model can lock the position of each arc-shaped block, prevent the arc-shaped block from moving during the treatment process, thereby improving the stability and safety of the device. (4) This utility model adopts a modular design, which is convenient for disassembly and maintenance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0015] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle.

[0016] Figure 4 This is a front view of the overall structure of this utility model.

[0017] Figure 5 This is a structural schematic diagram of the two fixed ring plates of this utility model.

[0018] Figure 6 This is a schematic diagram of the structure of the friction ring plate of this utility model.

[0019] Figure 7 for Figure 6 A magnified view of a portion of point C.

[0020] Figure 8 This is a structural schematic diagram of one part of the fixed ring plate of this utility model.

[0021] Figure 9 for Figure 8 A magnified view of a portion of point D.

[0022] Figure 10 This is a top view of the two structures of the fixed ring plate of this utility model.

[0023] Reference numerals: 101-Base plate; 102-Supporting circular plate; 103-Side plate; 104-Lifting ring plate; 105-Fixing ring plate one; 106-Fixing ring plate two; 107-Adjusting rack; 108-Supporting lead screw; 109-Supporting motor; 110-Auxiliary lead screw; 111-Auxiliary motor; 112-Leaving slide plate; 113-Lifting lead screw; 114-Lifting motor; 115-Voltage regulating electric cylinder ; 116-Adjustable slide plate; 117-Arc-shaped strip; 118-Arc-shaped soft pad; 119-Adjusting gear; 120-Transmission gear; 121-Adjusting gear ring; 122-Friction ring plate; 123-Shifting motor; 124-Adjusting motor; 125-Drive gear; 126-Adjusting lead screw; 127-Adjusting spline shaft; 128-Shifting gear ring; 129-Shifting ring plate; 130-Shifting gear. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] Example: Reference Figures 1-10A therapeutic chair for bone setting in rats with cervical radiculopathy includes a base plate 101, a side plate 103 fixedly mounted on the base plate 101, and a lifting assembly, a fixing assembly, and an auxiliary assembly disposed on the side plate 103. The lifting assembly includes a lifting ring plate 104 slidably mounted on the side plate 103, and a clearance slide plate 112 slidably mounted on the side plate 103. The clearance slide plate 112 and the lifting ring plate 104 are slidably engaged. A pressure adjusting slide plate 1 is slidably mounted on the outer side of the lifting ring plate 104. 16. A spring is provided between the pressure regulating slide plate 116 and the clearance slide plate 112. A pressure regulating electric cylinder 115 is also fixedly installed on the lifting ring plate 104. The piston rod end of the pressure regulating electric cylinder 115 is fixedly connected to the pressure regulating slide plate 116. A lifting screw 113 is rotatably installed on the side plate 103. The lifting screw 113 and the clearance slide plate 112 form a helical pair. A lifting motor 114 is fixedly installed on the side plate 103. The output shaft of the lifting motor 114 is fixedly connected to the lifting screw 113.

[0026] In the initial position, the spring between the yielding slide 112 and the pressure regulating slide 116 is not compressed, and the yielding slide 112 is located at the position furthest from the pressure regulating slide 116.

[0027] The starting of the lifting motor 114 drives the lifting screw 113 to rotate, causing the clearance slide 112 to move towards the lifting motor 114. Under the action of the spring between the clearance slide 112 and the pressure regulating slide 116, the lifting ring plate 104 moves synchronously towards the lifting motor 114. When the lifting ring plate 104 can no longer move towards the lifting motor 114, the clearance slide 112 continues to move upward relative to the lifting ring plate 104. The spring between the clearance slide 112 and the pressure regulating slide 116 is compressed. By starting the pressure regulating electric cylinder 115, the distance between the pressure regulating slide 116 and the clearance slide 112 is adjusted, thereby adjusting the compression state of the spring between the clearance slide 112 and the pressure regulating slide 116, thus changing the magnitude of the initial kinetic energy of the clearance slide 112 when it moves relative to the lifting ring plate 104 towards the lifting motor 114.

[0028] Both the fixing component and the auxiliary component include a second fixing ring plate 106. The second fixing ring plate 106 in the fixing component is fixedly installed on the side plate 103, and the second fixing ring plate 106 in the auxiliary component is slidably installed on the side plate 103. The axes of the first fixing ring plate 105 and the second fixing ring plate 106 are on the same straight line. The second fixing ring plate 106 in the fixing component is located between the first fixing ring plate 105 and the second fixing ring plate 106 in the auxiliary component. The first fixing ring plate 105 is located directly above the second fixing ring plate 106 in the fixing component.

[0029] A support circular plate 102 is slidably mounted on the side plate 103. The support circular plate 102 is located directly below the fixed ring plate 106 in the auxiliary assembly. A support screw 108 and an auxiliary screw 110 are rotatably mounted on the side plate 103. The support screw 108 and the support circular plate 102 form a screw pair. The auxiliary screw 110 and the fixed ring plate 106 in the auxiliary assembly form a screw pair. A support motor 109 and an auxiliary motor 111 are also fixedly mounted on the side plate 103. The output shaft of the support motor 109 is fixedly connected to the support screw 108. The output shaft of the auxiliary motor 111 is fixedly connected to the auxiliary screw 110.

[0030] Start the support motor 109 to drive the support screw 108 to rotate, so that the support circular plate 102 moves up and down relative to the base plate 101. Start the auxiliary motor 111 to drive the auxiliary screw 110 to rotate, so that the fixing ring plate 106 in the fixing assembly moves up and down relative to the base plate 101.

[0031] A fixed ring plate 105 is movably mounted on the lifting ring plate 104. A shifting ring plate 129 is fixedly mounted on the outer side of the fixed ring plate 105. The shifting ring plate 129 is rotatably mounted on the lifting ring plate 104. The axes of the shifting ring plate 129 and the lifting ring plate 104 are on the same straight line. A shifting gear ring 128 is fixedly mounted on the shifting ring plate 129. The axes of the shifting gear ring 128 and the shifting ring plate 129 are on the same straight line. A shifting motor 123 is also fixedly mounted on the lifting ring plate 104. A shifting gear 130 is fixedly mounted on the output shaft of the shifting motor 123. The shifting gear 130 and the shifting gear ring 128 form a gear pair. When the shifting motor 123 is started, it drives the shifting gear 130 to rotate, so that the shifting gear ring 128 rotates and the shifting ring plate 129 rotates synchronously, so that the fixed ring plate 105 rotates relative to the lifting ring plate 104.

[0032] Both the first fixed ring plate 105 and the second fixed ring plate 106 have six adjusting racks 107 slidably mounted in a circumferential array. Each adjusting rack 107 has an arc-shaped block 117 fixedly mounted at its end closest to the axis of the second fixed ring plate 106. Each arc-shaped block 117 has an arc-shaped soft pad 118 fixedly mounted on it. Both the first fixed ring plate 105 and the second fixed ring plate 106 have adjusting rings 121 rotatably mounted on them. The adjusting rings 121 are used to adjust the position of the corresponding adjusting racks 107. Both the first fixed ring plate 105 and the second fixed ring plate 106 have friction rings 122 slidably mounted on them. When the friction rings 122 and the corresponding arc-shaped blocks 117 engage, there is friction between them. The friction rings 122 are used to limit the rotation of the adjusting rings 121. Springs are provided between the first fixed ring plate 105, the second fixed ring plate 106, and the corresponding friction rings 122.

[0033] Six adjusting gears 119 are rotatably mounted on both the lifting ring plate 104 and the fixed ring plate 105. The adjusting gears 119 form gear rack pairs with the corresponding adjusting racks 107. The adjusting gears 119 are fixedly mounted with transmission gears 120. The transmission gears 120 and the corresponding adjusting gear rings 121 form gear pairs.

[0034] Both fixed ring plate 105 and fixed ring plate 106 are rotatably mounted with drive gears 125 and adjusting screws 126. Drive gear 125 and adjusting gear ring 121 form a gear pair. Drive gear 125 and corresponding adjusting screw 126 are rotatably connected. A torsion spring is provided between drive gear 125 and corresponding adjusting screw 126. One end of the torsion spring is fixedly connected to drive gear 125, and the other end of the torsion spring is fixedly connected to adjusting screw 126. Both friction ring plates 122 are rotatably mounted with adjusting spline shafts 127. Adjusting spline shafts 127 and corresponding drive gears 125 form a spline sliding fit. Adjusting spline shafts 127 and adjusting screws 126 form a helical pair. Both fixed ring plate 105 and fixed ring plate 106 are fixedly mounted with adjusting motors 124. The output shaft of adjusting motor 124 is fixedly connected to corresponding adjusting screws 126.

[0035] In the initial position, the torsion springs between the first fixed ring plate 105 and the second fixed ring plate 106 and the corresponding friction ring plate 122, as well as the torsion springs between the drive gear 125 and the adjusting screw 126, are not compressed. At this time, the friction ring plate 122 does not contact the adjusting gear ring 121, and the adjusting rack 107 is not at the position furthest from the axis of the second fixed ring plate 106.

[0036] The starting motor 124 drives the adjusting screw 126 to rotate. Under the action of the torsion spring between the driving gear 125 and the adjusting screw 126, the driving gear 125 rotates synchronously. Since the driving gear 125 and the adjusting spline shaft 127 form a spline sliding fit, the adjusting spline shaft 127 rotates synchronously at this time. The adjusting spline shaft 127 rotates relative to the friction ring plate 122. That is, at this time, the driving gear 125, the adjusting screw 126, and the adjusting spline shaft 127 rotate synchronously. Under the action of the driving gear 125, the adjusting gear ring 121 rotates, which causes the corresponding 6 transmission gears 120 to rotate synchronously. The adjusting gear 119 corresponding to the transmission gear 120 also rotates synchronously, which causes the 6 adjusting racks 107 corresponding to the fixed ring plate 106 to move synchronously towards the axis of the fixed ring plate 106. Consequently, the arc-shaped strip 117 corresponding to the fixed ring plate 106 moves synchronously towards the axis of the fixed ring plate 106.

[0037] When the arc-shaped soft pad 118 on the arc-shaped block 117 contacts the fixed object and cannot move further, the transmission gear 120 cannot continue to rotate, that is, the adjusting gear ring 121 cannot continue to rotate, and consequently the drive gear 125 cannot continue to rotate. At this time, the adjusting screw 126 continues to rotate, and the torsion spring between the drive gear 125 and the adjusting screw 126 is compressed. Under the action of the drive gear 125, the adjusting spline shaft 127 also cannot rotate. Since the adjusting screw 126 and the adjusting spline shaft 127 form a helical pair, the adjusting spline shaft 127 moves closer to the corresponding adjusting motor 1. As the 24-direction movement occurs, the friction ring plate 122 moves synchronously under the action of the adjusting spline shaft 127. The spring between the friction ring plate 122 and the corresponding fixed ring plate 106 is compressed, that is, the friction ring plate 122 moves towards the corresponding adjusting gear ring 121, eventually making the friction ring plate 122 and the corresponding adjusting gear ring 121 contact. At this time, under the action of the friction force between the adjusting gear ring 121 and the friction ring plate 122, the adjusting gear ring 121 cannot continue to rotate, that is, the position of the adjusting gear ring 121 is locked, thereby locking the position of the arc-shaped strip 117.

[0038] The position adjustment principle of the arc-shaped strip 117 on the fixed ring plate 105 is the same as above.

[0039] Working principle: In the initial position, the support motor 109, auxiliary motor 111, and lifting motor 114 are activated to move the support circular plate 102, the second fixing ring plate 106 in the auxiliary component, and the lifting ring plate 104 to the position furthest from the second fixing ring plate 106 in the fixing component. Then, the neck of the rat to be bone-set is placed in the middle position of the second fixing ring plate 106 in the fixing component. Then, the adjustment motor 124 in the fixing component is activated to move the corresponding 6 adjustment racks 107 towards the axis of the second fixing ring plate 106. Finally, the 6 arc-shaped soft pads 118 in the fixing component contact the neck of the rat. When the arc-shaped soft pads 118 can no longer move after contacting the neck of the rat, the adjustment motor 124 is activated again to lock the position of the arc-shaped strip 117 corresponding to the second fixing ring plate 106, that is, the neck of the rat is fixed at this time.

[0040] Then, the auxiliary motor 111 is restarted to move the second fixing ring plate 106 in the auxiliary component upward, so that the waist of the rat is located in the middle position of the second fixing ring plate 106. Then, the above steps are repeated so that the arc-shaped strip 117 in the auxiliary component can fix the waist of the rat.

[0041] Then, the support motor 109 is activated, causing the support plate 102 to move upward, so that the support plate 102 supports the rat's feet.

[0042] Then start the lifting motor 114 to adjust the position of the lifting ring plate 104 so that the rat's head is located at the center of the fixed ring plate 105. Then repeat the above steps so that the arc-shaped strip 117 in the lifting assembly can fix the rat's head.

[0043] Then, the strength of the spring between the yielding slide 112 and the pressure regulating slide 116 is adjusted according to the needs. When the lifting ring plate 104 can no longer move, the yielding slide 112 will move relative to the lifting ring plate 104 when it is subjected to a force exceeding the set value. When the yielding slide 112 moves relative to the lifting ring plate 104, the lifting motor 114 can be stopped in time to continue adjusting the position of the yielding slide 112, thereby preventing damage to the rat when the force applied to the rat exceeds the predetermined value.

[0044] Then, by starting the shift motor 123 to drive the shift gear 130 to rotate and adjust the position of the fixed ring plate 105, the rat's head rotates synchronously under the action of the arc-shaped block 117 on the fixed ring plate 105. Then, the lifting motor 114 is started to move the lifting ring plate 104 upward. Under the action of the arc-shaped block 117 on the fixed ring plate 105, the rat's head moves upward synchronously. This achieves the rotation and lifting of the rat's head before lifting it, thus achieving the rotation and lifting bone setting technique.

[0045] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.

Claims

1. A therapeutic chair for bone setting in rats with cervical radiculopathy, comprising a base plate (101) and side plates (103) fixedly mounted on the base plate (101), characterized in that: The side plate (103) is provided with a lifting component, a fixing component, and an auxiliary component. The lifting component includes a lifting ring plate (104) slidably mounted on the side plate (103). A first fixing ring plate (105) is movably mounted on the lifting ring plate (104). Both the fixing component and the auxiliary component include a second fixing ring plate (106). Six adjusting racks (107) are slidably mounted in a circumferential array on both the first fixing ring plate (105) and the second fixing ring plate (106). The ends of the adjusting racks (107) closest to the axis of the second fixing ring plate (106) are fixed. An arc-shaped strip (117) is provided. Adjustment gear rings (121) are rotatably installed on both the first fixed ring plate (105) and the second fixed ring plate (106). The adjustment gear ring (121) is used to adjust the position of the corresponding adjustment rack (107). Friction ring plates (122) are slidably installed on both the first fixed ring plate (105) and the second fixed ring plate (106). When the friction ring plate (122) and the corresponding arc-shaped strip (117) are engaged, there is friction between them. The friction ring plate (122) is used to limit the rotation of the adjustment gear ring (121).

2. The therapeutic chair for bone setting in rats with cervical radiculopathy according to claim 1, characterized in that: The second fixing ring plate (106) in the fixing assembly is fixedly installed on the side plate (103). The second fixing ring plate (106) in the auxiliary assembly is slidably installed on the side plate (103). The axes of the first fixing ring plate (105) and the second fixing ring plate (106) are on the same straight line. The second fixing ring plate (106) in the fixing assembly is located between the first fixing ring plate (105) and the second fixing ring plate (106) in the auxiliary assembly. The first fixing ring plate (105) is located directly above the second fixing ring plate (106) in the fixing assembly.

3. The therapeutic chair for bone setting in rats with cervical radiculopathy according to claim 2, characterized in that: A support circular plate (102) is also slidably installed on the side plate (103). The support circular plate (102) is located directly below the fixed ring plate (106) in the auxiliary assembly. A support screw (108) and an auxiliary screw (110) are rotatably installed on the side plate (103). The support screw (108) and the support circular plate (102) form a screw pair, and the auxiliary screw (110) and the fixed ring plate (106) in the auxiliary assembly form a screw pair.

4. The therapeutic chair for bone setting in rats with cervical radiculopathy according to claim 3, characterized in that: A clearance slide plate (112) is also slidably installed on the side plate (103). The clearance slide plate (112) and the lifting ring plate (104) are slidably engaged. A pressure regulating slide plate (116) is also slidably installed on the outer side of the lifting ring plate (104). A spring is provided between the pressure regulating slide plate (116) and the clearance slide plate (112). A pressure regulating electric cylinder (115) is also fixedly installed on the lifting ring plate (104). The piston rod end of the pressure regulating electric cylinder (115) is fixedly connected to the pressure regulating slide plate (116).

5. The therapeutic chair for bone setting in rats with cervical radiculopathy according to claim 4, characterized in that: A displacement ring plate (129) is also fixedly installed on the outer side of the fixed ring plate (105). The displacement ring plate (129) is rotatably installed on the lifting ring plate (104), and the axes of the displacement ring plate (129) and the lifting ring plate (104) are on the same straight line.

6. The therapeutic chair for bone setting in rats with cervical radiculopathy according to claim 5, characterized in that: Six adjusting gears (119) are rotatably mounted on both the lifting ring plate (104) and the fixed ring plate (105). The adjusting gears (119) and the corresponding adjusting racks (107) form a gear rack pair. A transmission gear (120) is fixedly mounted on each adjusting gear (119). The transmission gear (120) and the corresponding adjusting gear ring (121) form a gear pair.

7. The therapeutic chair for bone setting in rats with cervical radiculopathy according to claim 6, characterized in that: Both the first fixed ring plate (105) and the second fixed ring plate (106) are rotatably mounted with a drive gear (125) and an adjusting screw (126). The drive gear (125) and the adjusting gear ring (121) form a gear pair. The drive gear (125) and the corresponding adjusting screw (126) are rotatably connected. Both friction ring plates (122) are rotatably mounted with an adjusting spline shaft (127). The adjusting spline shaft (127) and the corresponding drive gear (125) form a spline sliding fit. The adjusting spline shaft (127) and the adjusting screw (126) form a helical pair.

8. The therapeutic chair for bone setting in rats with cervical radiculopathy according to claim 7, characterized in that: A torsion spring is provided between the drive gear (125) and the corresponding adjusting screw (126), and a spring is provided between the first fixed ring plate (105) and the second fixed ring plate (106) and the corresponding friction ring plate (122).

Images