Rotating assembly

Abstract

The embodiment of the utility model discloses a rotating component, a mounting part is arranged on a body part, and a shaft body is connected with the mounting part, penetrates through a first connecting hole and is connected with a moving part through a connecting body. Therefore, when a user drives the moving part to move, for example, the body part is lifted through the moving part, it can be guaranteed that the moving part and the body part have enough structural strength. And on the other hand, the friction force between the first contact area and the second contact area is utilized, the damping effect can be generated in the rotation of the moving part, so that the use experience is improved, the installation of the damping rotation structure is effectively simplified, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of connection structure technology, and in particular to a rotating component. Background Technology

[0002] Adding damping components to rotating connection structures can increase damping during rotation, improving the user experience. However, damping components are structurally complex, and installing them separately increases product installation costs. Therefore, simplifying the structure of damping components and reducing operating costs is a problem that needs to be addressed. Utility Model Content

[0003] In view of this, the present invention provides a rotating assembly that connects the moving part and the main body part together through a damping rotating structure, and uses the relative motion of the first contact area and the second contact area to generate frictional resistance, thereby simplifying the structure of the rotating assembly and reducing the cost of use.

[0004] The rotating assembly of this utility model embodiment includes:

[0005] Body part;

[0006] The moving part has a first connecting hole and a first contact area; and

[0007] A damping rotation structure includes a connecting part and a mounting part fixedly connected to the main body. The connecting part includes a shaft and a connecting body. The connecting body has a second contact area. The shaft passes through a first connecting hole and is connected to the mounting part. The first contact area abuts against the second contact area.

[0008] The moving part is rotatably connected to the shaft through the first connecting hole, and the first contact area and the second contact area rotate relative to each other and generate frictional resistance.

[0009] Furthermore, both the first contact area and the second contact area include an annular surface, and the annular surface of the first contact area or the second contact area is provided with friction protrusions, and one end of the shaft is connected to the center of the annular surface of the second contact area;

[0010] The friction protrusions slide on the annular surface and generate frictional resistance.

[0011] Furthermore, the body portion has a second connecting hole;

[0012] The mounting part has a third connecting hole, and the second connecting hole is correspondingly provided with the first connecting hole and the third connecting hole and is located between the first connecting hole and the third connecting hole;

[0013] The shaft passes through the first connecting hole, the second connecting hole, and the third connecting hole in sequence.

[0014] Furthermore, the third connecting hole is a threaded hole;

[0015] The shaft includes a threaded section along its length, which passes through the threaded hole and engages with it.

[0016] Furthermore, the mounting part includes:

[0017] The mounting base has the third connecting hole; and

[0018] The stop body has a limiting hole, which is correspondingly provided with the third connecting hole;

[0019] The shaft also includes a limiting section in the length direction. The limiting section is connected to the end of the threaded section away from the connector. The limiting section passes through the limiting hole to limit the rotation angle of the shaft.

[0020] Furthermore, the inner wall of the limiting hole has a plurality of limiting grooves, which are arranged circumferentially along at least a portion of the limiting hole and extend axially along the limiting hole.

[0021] The side of the limiting segment is provided with a limiting protrusion, the limiting protrusion extends along the length direction of the limiting segment, and the limiting protrusion extends into the limiting groove;

[0022] The shaft rotates at a predetermined angle relative to the third connecting hole, and the limiting protrusion abuts against the side wall of the limiting groove.

[0023] Furthermore, the shaft also includes a limiting head in the length direction, and the end of the limiting segment away from the threaded segment is connected to the limiting head;

[0024] The edge of the limiting hole on one side is opposite to a portion of the limiting head, and the edge of the hole on the other side is opposite to a portion of the threaded section, and the length of the limiting section is greater than the length of the limiting hole.

[0025] Furthermore, the stop body also has a relief groove, and the limiting hole communicates with the relief groove and opens towards one side of the stop body through the relief groove;

[0026] The limiting segment enters the limiting hole through the clearance groove.

[0027] Furthermore, the threaded hole includes a first threaded section and a second threaded section, the second threaded section having an opening that faces away from the clearance groove;

[0028] The threaded segment engages simultaneously with the first threaded segment and the second threaded segment, and a portion of the threaded segment is located within the opening.

[0029] Furthermore, the moving part has two first connecting holes and two first contact areas;

[0030] The damping rotation structure consists of two shafts, each passing through one of the first connecting holes, and two second contact areas arranged opposite to each other and abutting against the two first contact areas.

[0031] The rotating assembly of this embodiment of the invention has a mounting part disposed on the main body, a shaft connected to the mounting part and passing through a first connecting hole, and connected to the moving part through a connecting body. Therefore, when the user drives the moving part to move, for example by lifting the main body using the moving part, sufficient structural strength can be ensured for both the moving part and the main body. Furthermore, the friction between the first and second contact areas generates a damping effect during the rotation of the moving part, thereby improving the user experience, effectively simplifying the installation of the damping rotation structure, and reducing manufacturing costs. Attached Figure Description

[0032] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0033] Figure 1 This is a schematic diagram of the rotating assembly according to an embodiment of the present invention;

[0034] Figure 2 This is an exploded view of one side of the rotating component according to an embodiment of the present invention;

[0035] Figure 3 This is an exploded view of the other side of the rotating assembly according to an embodiment of the present invention;

[0036] Figure 4 This is a cross-sectional schematic diagram of one side of the rotating component according to an embodiment of the present invention;

[0037] Figure 5 This is a cross-sectional schematic diagram of the other side of the rotating component according to an embodiment of the present invention;

[0038] Figure 6 yes Figure 5 Cross-sectional view of the installation section at point AA;

[0039] Figure 7 yes Figure 5 A cross-sectional view of the mounting section and shaft at point AA.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Damped rotation structure;

[0042] 11-Connecting part;

[0043] 111-Shaft body; 1111-Threaded section; 1112-Limiting section; 1113-Limiting head; 1114-Extension section;

[0044] 112 - Connector; 113 - Second contact area;

[0045] 12-Installation Section;

[0046] 121-Fixed base; 122-Stop body;

[0047] 2-Kinematics Department;

[0048] 21 - First contact area;

[0049] 3-Body part;

[0050] 41-First connecting hole; 42-Second connecting hole; 43-Third connecting hole; 431-First threaded section; 432-Second threaded section; 433-Opening; 44-Limiting hole; 45-Allowing groove;

[0051] 51-Toroidal surface; 52-Friction protrusion;

[0052] 61-Limiting groove; 62-Limiting protrusion. Detailed Implementation

[0053] The present invention will now be described based on embodiments, but it is not limited to these embodiments. In the following detailed description of the present invention, certain specific details are described in detail. Those skilled in the art will fully understand the present invention even without these details. To avoid obscuring the essence of the present invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0054] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0055] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0056] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0057] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] Figure 1 This is a schematic diagram of the rotating assembly in this embodiment. Figure 2 and Figure 3 This is an exploded view of the rotating assembly in this embodiment.

[0059] In some implementations, such as Figure 1-3 As shown, the rotating assembly in this embodiment includes a damping rotation structure 1, a moving part 2, and a body part 3. The moving part 2 is rotatably connected to the body part 3 via the damping rotation structure 1. The damping rotation structure 1 includes a connecting part 11 and a mounting part 12. Thus, by utilizing the damping generated by the moving part 2 and the damping rotation structure 1 during rotation, the moving part 2 produces a damping effect. The moving part 2 includes, but is not limited to, the form of a handle, a cover, or a door panel. Those skilled in the art can, according to design requirements, install the damping rotation structure 1 on a specific rotating assembly.

[0060] Taking the handle as an example, the main body 3 can be configured as a storage box (e.g., a toolbox). During the use of the damping rotation structure 1, the handle can be held upright facing the storage box or folded to the side, facilitating lifting or storage by the user. Taking the lid as an example, the main body 3 can be a box (e.g., a trash can or storage box). During the process of opening and closing the lid, the damping rotation structure 1 prevents the lid from colliding with the box, while also allowing the lid to remain at any opening angle. Taking the door panel as an example, the main body 3 can be a door frame, and the damping rotation structure 1 prevents direct collision between the door panel and the door frame.

[0061] Figure 4 This is a cross-sectional view of one side of the rotating component in this embodiment.

[0062] In some implementations, such as Figure 4 As shown, the moving part 2 has a first connecting hole 41 and a first contact area 21. One end of the first connecting hole 41 is connected to the first contact area 21.

[0063] Figure 5 This is a cross-sectional view of the other side of the rotating assembly in this embodiment.

[0064] In some implementations, such as Figures 3-5 As shown, the damping rotation structure 1 includes a connecting portion 11 and a mounting portion 12 fixedly connected to the main body portion 3. The connecting portion 11 includes a shaft 111 and a connecting body 112, the connecting body 112 having a second contact area 113. The shaft 111 passes through a first connecting hole 41 and is connected to the mounting portion 12, the first contact area 21 and the second contact area 113 abut against each other. The damping rotation structure 1 is configured such that the moving part 2 is rotatably connected to the shaft 111 through the first connecting hole 41, and when the user drives the first contact area 21 and the second contact area 113 to rotate relative to each other, the first contact area 21 will generate frictional resistance with the second contact area 113.

[0065] In this embodiment, the mounting portion 12 is used to fix the connecting portion 11, preventing the connecting portion 11 from rotating synchronously with the moving portion 2 during rotation. This ensures that relative movement can occur between the first contact area 21 and the second contact area 113. The connecting portion 11 includes an extension 1114 that passes through the first connecting hole 41, allowing the moving portion 2 to be stably connected to the body portion 3 via the connecting portion 11. This ensures the structural strength of the rotating assembly.

[0066] Preferably, the moving part 2 is provided with a stepped hole, the large-diameter end of which is used to accommodate the connecting body 112, and the platform of the stepped hole is used to form the first contact area 21. The extension section 1114 passes through the small-diameter end of the stepped hole.

[0067] In summary, in this embodiment, the rotating assembly has the mounting part 12 disposed on the body part 3, the shaft 111 connected to the mounting part 12 and passing through the first connecting hole 41, and connected to the moving part 2 through the connecting body 112. Therefore, when the user drives the moving part 2 to move, for example by lifting the body part 3 through the moving part 2, sufficient structural strength can be ensured for both the moving part 2 and the body part 3. On the other hand, the friction between the first contact area 21 and the second contact area 113 generates a damping effect during the rotation of the moving part 2, thereby improving the user experience, effectively simplifying the installation of the damping rotation structure 1, and reducing manufacturing costs.

[0068] In some implementations, such as Figures 3-4 As shown, both the first contact area 21 and the second contact area 113 include an annular surface 51, and the annular surface 51 of the first contact area 21 or the second contact area 113 is provided with a friction protrusion 52. One end of the shaft 111 is connected to the center of the annular surface 51 of the second contact area 113. The friction protrusion 52 slides on the annular surface 51 and generates frictional resistance.

[0069] Specifically, the first contact area 21 is an annular surface 51. Friction protrusions 52 are provided on the second contact area 113. These friction protrusions 52 consist of multiple protrusions spaced apart. This increases the coefficient of friction between the connecting body 112 and the moving part 2 by utilizing these multiple protrusions, thereby improving the damping effect during the movement of the moving part 2. Furthermore, when the moving part 2 rotates to a certain angle, it can be kept stationary at that position.

[0070] In some implementations, such as Figure 4 As shown, the main body 3 has a second connecting hole 42. The mounting part 12 has a third connecting hole 43. The second connecting hole 42 is provided corresponding to the first connecting hole 41 and the third connecting hole 43 and is located between the first connecting hole 41 and the third connecting hole 43. Further referring to... Figure 5 As shown, the shaft 111 passes through the first connecting hole 41, the second connecting hole 42 and the third connecting hole 43 in sequence.

[0071] Specifically, the extension section 1114 passes through both the first connecting hole 41 and the second connecting hole 42, and the outer diameter of the extension section 1114 is larger than other areas of the shaft 111. Thus, through the cooperation of the extension section 1114 with the first connecting hole 41 and the second connecting hole 42, the stress of the moving part 2 can be transferred to the body part 3, preventing the stress from acting directly on the damping rotation structure 1 when the moving part 2 lifts the body part 3.

[0072] In some implementations, such as Figures 3-5 As shown, the third connecting hole 43 is a threaded hole. The shaft 111 includes a threaded section 1111 along its length, which passes through and engages with the threaded hole. In this embodiment, the damping rotation structure 1, by utilizing the engagement of the threaded hole and the threaded section 1111, can control the screw-in depth of the shaft 111, thereby adjusting the normal pressure between the first contact area 21 and the second contact area 113. This allows the user to adjust the damping magnitude of the moving part 2.

[0073] In some implementations, such as Figures 3-4 As shown, the mounting part 12 includes a fixing base 121 and a stop body 122. The fixing base 121 has a third connecting hole 43. The stop body 122 has a limiting hole 44, which is correspondingly provided with the third connecting hole 43. Further referencing... Figure 5 As shown, the shaft 111 also includes a limiting section 1112 in the length direction. The limiting section 1112 is connected to the end of the threaded section 1111 away from the connecting body 112, and the limiting section 1112 passes through the limiting hole 44 to limit the rotation angle of the shaft 111.

[0074] In this embodiment, the side of the limiting segment 1112 contacts the inner wall of the limiting hole 44, so that the shaft 111 and the stop body 122 generate a blocking force. This blocking force can offset the frictional force generated by the first contact area 21 on the second contact area 113, thereby preventing the connecting part 11 from rotating or reducing the rotation amplitude of the connecting part 11.

[0075] Figure 6 yes Figure 5 A cross-sectional view of the mounting section 12 at point AA. Figure 7 yes Figure 5 A cross-sectional view of the mounting section 12 and the shaft 111 at point AA. Figure 7 The shaft 111 is rotating counterclockwise.

[0076] In some implementations, such as Figures 4-6 As shown, the inner wall of the limiting hole 44 has a plurality of limiting grooves 61, which are arranged circumferentially along at least a portion of the limiting hole 44 and extend axially along the limiting hole 44. Further referring to... Figure 7 As shown, a limiting protrusion 62 is provided on the side of the limiting segment 1112. The limiting protrusion 62 extends along the length direction of the limiting segment 1112 and extends into the limiting groove 61. When the shaft 111 rotates at a predetermined angle relative to the third connecting hole 43, the limiting protrusion 62 will abut against the side wall of the limiting groove 61 to limit the rotation range of the connecting part 11.

[0077] Preferably, the number of limiting protrusions 62 is multiple and evenly distributed along the circumference of the limiting segment 1112. Simultaneously, at least two limiting protrusions 62 extend into their corresponding limiting grooves 61. Thus, the cooperation between the limiting grooves 61 and the limiting protrusions 62 increases the contact area between the connecting portion 11 and the stop body 122. This allows the stop body 122 and the limiting segment 1112 to also provide a certain degree of damping.

[0078] Optionally, the inner wall of the limiting hole 44 is provided with multiple stop strips, and the area between two stop strips forms the aforementioned limiting groove 61. Meanwhile, the stop body 122 is made of rubber. When the limiting protrusion 62 abuts against the stop strip, the stop strip is compressed and deformed, thereby further improving the damping effect.

[0079] Optionally, the stop body 122 can be made of materials such as PEEK or polyoxymethylene. This gives the stop body 122 a certain degree of wear resistance and self-lubricating ability, preventing rapid wear of the stop bar during the use of the damping rotation structure 1.

[0080] In some implementations, such as Figure 5As shown, the shaft 111 also includes a limiting head 1113 in the length direction, and the end of the limiting segment 1112 away from the threaded segment 1111 is connected to the limiting head 1113. The edge of the limiting hole 44 on one side is opposite to a portion of the limiting head 1113, and the edge of the hole on the other side is opposite to a portion of the threaded segment 1111, and the length of the limiting segment 1112 is greater than the length of the limiting hole 44.

[0081] Specifically, in this embodiment, there is a gap between the limiting head 1113 and the limiting hole 44 in the axial direction of the limiting hole 44 (e.g., Figure 5 As shown in region B1), there is a gap between the threaded section 1111 and the limiting hole 44 (as shown in the middle region B1). Figure 5 (As shown in region B2). Therefore, when the movement amplitude of the moving part 2 is too large or during prolonged rotation, the limiting head 1113 can prevent the threaded section 1111 from moving too far within the threaded hole, thus avoiding separation of the first contact area 21 and the second contact area 113 or excessive stress between them. At the same time, the gap between regions B1 and B2 ensures that the connecting part 11 has a certain rotation amplitude, thereby providing partial damping effect for the damping rotation structure 1 through the cooperation of the stop body 122 and the limiting section 1112.

[0082] In some implementations, such as Figure 3 As shown, the stop body 122 also has a relief groove 45, and the limiting hole 44 communicates with the relief groove 45 and opens towards one side of the stop body 122 through the relief groove 45. The limiting segment 1112 enters the limiting hole 44 through the relief groove 45. In this embodiment, the stop body 122 can be installed on the fixing base 121 from above, thus avoiding interference between the limiting head 1113 and the stop body 122.

[0083] In some implementations, such as Figures 3-5 As shown, the threaded hole includes a first threaded section 431 and a second threaded section 432. The second threaded section 432 has an opening 433, which faces away from the relief groove 45. The threaded section 1111 engages with both the first threaded section 431 and the second threaded section 432, and a portion of the threaded section 1111 is located in the opening 433.

[0084] In this embodiment, the opening 433 in the second threaded section 432 reduces the contact area between the internal threaded hole and the external thread. This, in turn, reduces the friction between the fixed seat 121 and the shaft 111, preventing rapid wear of the external thread. Simultaneously, the opening 433 is configured to face away from the relief groove 45. When the limiting hole 44 applies downward pressure to the limiting section 1112, the second threaded section 432 can bear the downward pressure at the bottom of the threaded section 1111. This prevents the shaft 111 from bending and deforming towards the relief groove 45.

[0085] In some implementations, such as Figures 1-5 As shown, the moving part 2 has two first connecting holes 41 and two first contact areas 21. There are two damping rotation structures 1, with two shafts 111 passing through the two first connecting holes 41 respectively, and two second contact areas 113 arranged opposite to each other and abutting against the two first contact areas 21 respectively.

[0086] In this embodiment, when the threads of the two threaded segments 1111 are screwed together, the two connecting bodies 112 will push against the two first contact areas 21, causing the two first connecting holes 41 to come closer to each other. Taking the handle as an example, in the above process, the two connecting parts 11 will force the two ends of the handle to come closer to each other, and the elastic force generated by the handle in this process can ensure that the first contact area 21 and the second contact area 113 are tightly attached together.

[0087] Preferably, an elastomer (e.g., a compression spring or disc spring) is provided between the first connecting hole 41 and the second connecting hole 42. That is, the extension 1114 passes through the first connecting hole 41, the elastomer, and the second connecting hole 42 in sequence, so that the compression spring or disc spring can press the end of the handle against the second contact area 113.

[0088] In one alternative implementation, such as Figure 3 As shown, the rotating assembly in this embodiment can be installed in the following manner. First, the two fixed seats 121 are fixedly connected to the main body 3, and the third connecting hole 43 is correspondingly set with the second connecting hole 42. Second, the two connecting parts 11 are respectively passed through the two first connecting holes 41 and the two second connecting holes 42, and respectively screwed into the two third connecting holes 43. Finally, the two stop bodies 122 are installed on the fixed seats 121 from above the limiting section 1112. Thus, the assembly of the rotating assembly is completed.

[0089] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principle of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotating assembly, characterized in that, The rotating assembly includes: Body part(3); The moving part (2) has a first connecting hole (41) and a first contact area (21); and The damping rotation structure (1) includes a connecting part (11) and a mounting part (12) fixedly connected to the main body part (3). The connecting part (11) includes a shaft (111) and a connecting body (112). The connecting body (112) has a second contact area (113). The shaft (111) passes through the first connecting hole (41) and is connected to the mounting part (12). The first contact area (21) abuts against the second contact area (113). The moving part (2) is rotatably connected to the shaft (111) through the first connecting hole (41), and the first contact area (21) and the second contact area (113) rotate relative to each other and generate frictional resistance.

2. The rotating assembly according to claim 1, characterized in that, Both the first contact area (21) and the second contact area (113) include an annular surface (51), and the annular surface (51) of the first contact area (21) or the second contact area (113) is provided with friction protrusions (52), and one end of the shaft (111) is connected to the center of the annular surface (51) of the second contact area (113). The friction protrusion (52) slides on the annular surface (51) and generates frictional resistance.

3. The rotating assembly according to claim 1, characterized in that, The body part (3) has a second connecting hole (42); The mounting part (12) has a third connecting hole (43), and the second connecting hole (42) is correspondingly disposed with the first connecting hole (41) and the third connecting hole (43) and is located between the first connecting hole (41) and the third connecting hole (43); The shaft (111) passes through the first connecting hole (41), the second connecting hole (42) and the third connecting hole (43) in sequence.

4. The rotating assembly according to claim 3, characterized in that, The third connecting hole (43) is a threaded hole; The shaft (111) includes a threaded section (1111) in the length direction, the threaded section (1111) passing through the threaded hole and screwed in.

5. The rotating assembly according to claim 4, characterized in that, The mounting part (12) includes: The mounting base (121) has the third connecting hole (43); and The stop body (122) has a limiting hole (44), which is correspondingly provided with the third connecting hole (43); The shaft (111) also includes a limiting section (1112) in the length direction. The limiting section (1112) is connected to the end of the threaded section (1111) away from the connector (112). The limiting section (1112) passes through the limiting hole (44) to limit the rotation angle of the shaft (111).

6. The rotating assembly according to claim 5, characterized in that, The inner wall of the limiting hole (44) has a plurality of limiting grooves (61), which are arranged in at least part of the circumferential direction of the limiting hole (44) and extend along the axial direction of the limiting hole (44). The side of the limiting segment (1112) is provided with a limiting protrusion (62), the limiting protrusion (62) extends along the length direction of the limiting segment (1112), and the limiting protrusion (62) extends into the limiting groove (61); The shaft (111) rotates at a predetermined angle relative to the third connecting hole (43), and the limiting protrusion (62) abuts against the side wall of the limiting groove (61).

7. The rotating assembly according to claim 5, characterized in that, The shaft (111) also includes a limiting head (1113) in the length direction, and the end of the limiting segment (1112) away from the threaded segment (1111) is connected to the limiting head (1113); The edge of the limiting hole (44) on one side is opposite to a portion of the limiting head (1113), and the edge of the hole on the other side is opposite to a portion of the threaded section (1111). The length of the limiting section (1112) is greater than the length of the limiting hole (44).

8. The rotating assembly according to claim 7, characterized in that, The stop body (122) also has a relief groove (45), and the limiting hole (44) communicates with the relief groove (45) and opens to one side of the stop body (122) through the relief groove (45). The limiting segment (1112) enters the limiting hole (44) through the clearance groove (45).

9. The rotating assembly according to claim 8, characterized in that, The threaded hole includes a first threaded section (431) and a second threaded section (432), the second threaded section (432) having an opening (433) which faces away from the relief groove (45); The threaded segment (1111) engages simultaneously with the first threaded segment (431) and the second threaded segment (432), and a portion of the threaded segment (1111) is located in the opening (433).

10. The rotating assembly according to any one of claims 1-9, characterized in that, The moving part (2) has two first connecting holes (41) and two first contact areas (21); The damping rotation structure (1) has two components, with the two shafts (111) passing through the two first connecting holes (41) respectively, and the two second contact areas (113) being arranged opposite to each other and abutting against the two first contact areas (21) respectively.

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