Rotary damping structure and handrail

Abstract

The utility model provides a rotatory damping structure and handrail, rotatory damping structure includes connecting piece and rotatory piece, connecting piece and rotatory piece pass through rotating shaft rotatory connection, rotating shaft includes damping sleeve and support shaft, after the damping sleeve sets up in connecting piece and rotatory piece, and then sets up the support shaft to provide rigidity and enlarge the diameter of damping sleeve. The rotating damping of the rotating piece and the connecting piece is increased, the damping hovering function is achieved, excessive rotation is prevented, and accidents are avoided; friction damping is used for replacing structural damping, needed parts are reduced, assembly is convenient, and the part cost is saved. The armrest comprises a basic bearing part, a movable bearing part and the rotary damping structure, the movable bearing part can be turned over on the basic bearing part through the rotary damping structure, when the movable bearing part is turned over to the position above the basic bearing part, the armrest can be used for bearing an arm, and when the movable bearing part is turned over to the side of the basic bearing part, the armrest can be used for supporting the arm. The handrail forms a platform which can be used for placing articles.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to a rotation damping structure and armrest. Background Technology

[0002] In modern life, the multi-functionality of chairs is becoming increasingly prominent. Taking the armrests of office chairs as an example, the position of existing chair armrests can generally be adjusted to meet people's usage needs. However, the most important function of existing armrests is to support the human arm. On this basis, and considering cost factors, the armrest surface is uniformly long and thin. This shape of armrest can effectively achieve the function of supporting the human arm at a lower cost, so manufacturers have always adhered to this design.

[0003] Sofa armrests are generally larger and usually consist of blocky boxes with long, narrow surfaces. However, some sofas have hidden flip-out trays in their armrests. Users can open the armrest, rotate the tray upwards, and then rotate it horizontally to place their belongings on it. Office chair armrests do not have this function. We envision dividing the armrest into two foldable and unfoldable parts to achieve the function of the tray. Currently, there is a damped rotating structure that increases damping through toothed parts and spring compression. However, over time, the damping structure is prone to loosening, and the components are complex and costly. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a rotational damping structure, including a connector and a rotating component. The connector and the rotating component are rotatably connected via a rotating shaft, which includes a damping sleeve and a support shaft. After the damping sleeve is placed in the connector and the rotating component, the support shaft is then provided to provide rigidity and increase the diameter of the damping sleeve, thereby increasing the rotational damping of the rotating component and the connector, achieving a damping and hovering function, preventing excessive rotation and avoiding accidents. By using frictional damping instead of structural damping, the required parts are reduced, assembly is facilitated, and component costs are saved.

[0005] A handrail is further provided, including a basic support, a movable support, and the aforementioned rotation damping structure. The first and second connecting members in the rotation damping structure are respectively connected to the basic support and the movable support. The movable support can be flipped on the basic support. When the movable support is flipped above the basic support, the handrail can be used to support the arm. When the movable support is flipped to the side of the basic support, the handrail forms a platform that can be used to place items.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A rotational damping structure includes a connector and a rotating component. The connector and the rotating component are rotatably connected by a rotating shaft. The rotating shaft includes a damping sleeve and a support shaft. The rotating component has a mounting hole, and the connector has a corresponding insertion hole. The damping sleeve is inserted into the mounting hole and the insertion hole, and the support shaft is inserted into the damping sleeve. The damping sleeve is configured to increase the rotational damping of the rotating component and the connector.

[0008] The use of damping sleeves to increase the rotational damping of the connecting parts and rotating parts enables the damping hovering function. Structurally, it eliminates the need for multiple damping components, facilitating assembly and saving on component costs. Functionally, the added damping prevents excessive rotation and avoids accidents. The support shaft increases the connection strength, maintains the relative position between the connecting parts and the basic support components to prevent them from falling off, and also expands the damping sleeve to increase friction.

[0009] Preferably, the damping sleeve is elastic, and the support shaft is inserted into the damping sleeve and presses it outward. The damping sleeve, support shaft, mounting hole, and insertion hole are all interference fit. The interference fit increases friction to achieve rotational damping.

[0010] Preferably, a limiting groove is provided inside the mounting hole, and a limiting protrusion is provided on the damping sleeve, with the limiting protrusion positioned within the limiting groove. The damping sleeve and the rotating component have circumferential limiting to prevent relative rotation between them. When the connecting component rotates relative to the rotating component, the damping sleeve functions to increase the rotational damping of the connecting component.

[0011] Preferably, the damping sleeve at the bottom of the insertion hole has at least two circumferentially distributed bulges, with a gap between the bulges in the circumferential direction. This design facilitates the insertion of the damping sleeve into the insertion hole and also enables the expansion to achieve damping.

[0012] Preferably, there are two expansion sections, each with a width smaller than the diameter of the damping sleeve. The area of ​​the expansion sections does not need to be large. First, the expansion sections are more easily deformed by the support shaft, thus naturally increasing the contact area. Second, the ends of the expansion sections can generate greater damping, which is more effective than other parts of the complete curved surface.

[0013] Preferably, the damping sleeve is in the shape of a hollow column and is made of PUM material.

[0014] Preferably, the support shaft is a metal shaft to ensure the strength of the rotating shaft.

[0015] A handrail includes a basic support member, a movable support member, and a rotation damping structure as described above. The rotation damping structure has two connecting members, each of which is connected to a rotating member via at least one of the pivot shafts. The two connecting members are a first connecting member and a second connecting member. The first connecting member is connected to the basic support member, and the second connecting member is connected to the movable support member. The movable support member is rotatably mounted on the movable support member via the rotation damping structure. When the movable support member is flipped over to the top of the basic support member, the handrail is used to support an arm. When the movable support member is flipped to the side of the basic support member, the handrail is used to place items.

[0016] The multi-purpose handrail with added damping can remain stationary when the movable support is rotated to any position, preventing the movable support from suddenly tipping over due to gravity and avoiding the occurrence of hand pinching.

[0017] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0018] The use of damping sleeves to increase the rotational damping of the connecting parts and rotating parts enables the damping hovering function. Structurally, it eliminates the need for multiple damping components, facilitating assembly and saving on component costs. Functionally, the added damping prevents excessive rotation and avoids accidents. The support shaft increases the connection strength, maintains the relative position between the connecting parts and the basic support components to prevent them from falling off, and also expands the damping sleeve to increase friction. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the multi-purpose handrail in the extended state of the present invention in the embodiments;

[0020] Figure 2 This is a schematic diagram of the movement of the supporting component when switching from the conventional state to the extended state in an embodiment of the present invention;

[0021] Figure 3 This is a three-dimensional structural diagram of the multi-purpose handrail during the transition from the conventional state to the extended state in an embodiment of the present invention. Figure 1 ;

[0022] Figure 4 This is a three-dimensional structural diagram of the multi-purpose handrail during the transition from the conventional state to the extended state in an embodiment of the present invention. Figure 2 ;

[0023] Figure 5 This is a three-dimensional structural diagram of the multi-purpose handrail in the conventional state of the present invention in the embodiments;

[0024] Figure 6 This is a top view of the support component in the extended state of the present invention in an embodiment;

[0025] Figure 7 for Figure 6 Sectional view at point A in the middle;

[0026] Figure 8 for Figure 6 Sectional view at point B;

[0027] Figure 9 This is an exploded view of the support component and the state switching component in the extended state of the present invention in the embodiments;

[0028] Figure 10 This is an exploded view of the damping sleeve and support shaft in an embodiment of the present invention;

[0029] Figure 11 This is a three-dimensional structural diagram of the rotating shaft in an embodiment of the present invention;

[0030] Figure 12 This is a top view of the support component in its conventional state in the embodiments of this utility model;

[0031] Figure 13 for Figure 12 Sectional view at point D;

[0032] Figure 14 This is an exploded view of the support component and state switching mechanism in the conventional state of the present invention in the embodiments;

[0033] Figure 15 This is a three-dimensional structural diagram of the first connecting member in an embodiment of the present invention;

[0034] Figure 16 This is a three-dimensional structural diagram of the second connector in an embodiment of the present invention;

[0035] Figure 17 This is a three-dimensional structural diagram of the rotating component in an embodiment of the present invention.

[0036] The reference numerals in the accompanying drawings are as follows: support assembly 1; rotating rod 101; rotating seat 102; support frame 103; fixed support 1031; lifting support 1032; supporting assembly 2; basic supporting component 21; first notch 211; movable supporting component 22; second notch 221; first connecting component 3; first rotating part 31; first connecting part 32; first limiting part 33; first locking part 34; second connecting component 4; second rotating part 41; second connecting part 42; second limiting part 43. Second locking part 44; Rotating part 5; Receiving part 51; Mounting part 52; First rotating groove 53; Second rotating groove 54; First limiting boss 55; First locking platform 56; Second limiting boss 57; Second locking platform 58; Mounting hole 59; Limiting groove 591; Conventional support surface 61; Widened support surface 62; Component surface 7; Anti-slip pad 8; First rotating shaft 9; Second rotating shaft 10; Damping sleeve 11; Limiting protrusion 111; Expanding part 112; Support shaft 12; Insertion hole 13. Detailed Implementation

[0037] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0039] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] The specific implementation of this utility model is as follows:

[0041] like Figure 9-11 As shown in Figure 14, this utility model provides a rotational damping structure, which is applied to a multi-purpose handrail, such as... Figure 1-5 As shown, the multi-purpose handrail includes:

[0042] Support component 1 is configured as the main support for the handrail;

[0043] A support assembly 2 is disposed on the support assembly 1 and configured to support the arm. The support assembly 2 includes a basic support member 21 and at least one movable support member 22, the basic support member 21 being connected to the support assembly 1;

[0044] A state switching mechanism is connected to the basic support 21 and the movable support 22 respectively; the state switching mechanism is configured to enable the movable support 22 to be movably connected to the basic support 21 and to enable the handrail to switch between a normal state and an extended state.

[0045] The handrail has a normal state and an extended state:

[0046] In normal conditions, the movable support 22 and the basic support 21 are arranged side by side along the height direction, and the upper surface of the support assembly 2 forms an elongated conventional support surface 61 for supporting the arm.

[0047] When switching from the normal state to the extended state, the movable support 22 moves to the side of the basic support 21;

[0048] In the extended state, the movable support 22 is located next to the basic support 21 and the long sides of the two are adjacent. The movable support 22 and the basic support 21 together form an extended support surface 62 for supporting the arm and the item.

[0049] In its extended state, the width of the handrail is greater than that in its normal state.

[0050] In this design, the support component 2 can move via a state-switching mechanism, allowing the multi-purpose armrest to switch between a normal state and an extended state. In the normal state, the multi-purpose armrest functions like a regular armrest, forming a standard support surface 61 for supporting the arm, and the chair with this armrest can be used as usual. When the multi-purpose armrest is switched to the extended state, the movable support component 22 is located next to the basic support component 21, with their long sides adjacent. This arrangement significantly increases the original width and area, potentially exceeding the sum of the widths of the two support components. The resulting support surface is the extended support surface 62, allowing the multi-purpose armrest to function as a small table. Users can easily place work-related items such as laptops and tablets on it, as well as items like water cups. This greatly increases the usability of the multi-purpose armrest, meeting more user needs and allowing people to conveniently use the small table on their desks.

[0051] Furthermore, in the extended state, the width of the multi-purpose handrail is not less than the sum of the short side lengths of the movable support 22 and the basic support 21. At this time, the area of ​​the widened support surface 62 is at least twice that of the conventional support surface 61. After greatly increasing the usable area, it can be used as a small table.

[0052] Additionally, it should be noted that, besides thickness, the support member is roughly rectangular in shape in the plane, with two longer sides and two shorter sides. When stationary, the left and right sides are generally the longer sides, while the front and back sides become the shorter sides. Support assembly 2 has at least two support members, but multiple support members can achieve the same effect by setting two or more movable support members 22 onto the basic support member 21 via a state switching mechanism. The state switching mechanism can be of various types, and the movable support member 22 can be slidably, rotatably, or a combination of both on the basic support member 21. The movable support member 22 can be located above or below the basic support member 21, or even inside the basic support member 21.

[0053] In this embodiment, there is one basic support member 21 and one movable support member 22. The state switching mechanism is a rotation mechanism. The multi-purpose handrail switches from the normal state to the extended state, which is the process of the support component switching from a closed posture to a semi-open posture, and then to a fully open posture. Specifically, as Figure 9 , 14 As shown, the state switching mechanism includes a first connecting member 3, a second connecting member 4, and a rotating member 5. The first connecting member 3 is fixedly connected to the basic support member 21 by screws, the second connecting member 4 is fixedly connected to the movable support member 22 by screws, the rotating member 5 is rotatably connected to the first connecting member 3 by at least one first rotating shaft 9, and the rotating member 5 is rotatably connected to the second connecting member 4 by at least one second rotating shaft 10. When the state switching mechanism is a rotating mechanism, it can realize the function of state switching. There are two of each of the first rotating shaft 9 and the second rotating shaft 10. Along the length of the rotating member 5, a set of first rotating shaft 9 and a set of second rotating shaft 10 are provided at each end of the rotating member 5. In the normal state and when the supporting component 2 and the supporting component 1 do not move, the supporting component 2 is arranged in the front-back direction as a whole. The movable supporting component 22 and the basic supporting component 21 are both arranged in the front-back direction, and the side extending in the front-back direction on the supporting component is the long side. The first rotating shaft 9 and the second rotating shaft 10 are both arranged in the front-back direction. The length direction of the rotating member 5 is also in the front-back direction. The first rotating shaft 9 and the second rotating shaft 10 are arranged at intervals along the width direction of the rotating member 5, and the first rotating shaft 9 and the second rotating shaft 10 are parallel to each other.

[0054] like Figure 5 , 9As shown in Figures 12-14, the basic support member 21 has a first notch 211, and the movable support member 22 has a second notch 221. The first notch 211 and the second notch 221 form an accommodating space, and the rotating member 5 is disposed in the accommodating space. In the normal state, the rotating member 5 is vertical, and in the extended state, the rotating member 5 is horizontal. Whether in the normal state or the extended state, the state switching mechanism is located in the support component 2 without any abruptness, which increases the integrity and visual effect. In particular, in the normal state, the rotating member 5 can be hidden on the side of the support component 2, unlike a direct single-axis hinge, which would protrude from the support component 2.

[0055] In the normal state, the movable support 22 is located above the basic support 21, which is equivalent to horizontally dividing the original handrail into two parts, forming the movable support 22 and the basic support 21.

[0056] Specifically, the state transition is achieved through rotation:

[0057] like Figure 6-17 As shown, the rotating member 5 includes a receiving part 51 and two mounting parts 52. The two ends of the receiving part 51 are respectively connected to the two mounting parts 52. The first connecting member 3 includes a first rotating part 31 and a first connecting part 32 for connecting the basic support member 21. The second connecting member 4 includes a second rotating part 41 and a second connecting part 42 for connecting the movable support member 22. The first rotating part 31 and the second rotating part 41 are both located between the two mounting parts 52. The first rotating part 31 and the mounting part 52 are rotatably connected by a first rotating shaft 9. The second rotating part 41 and the mounting part 52 are rotatably connected by a second rotating shaft 10. The rotating part and the mounting part 52 have rotating shafts inserted at both ends.

[0058] The rotating member 5 is provided with a first rotating groove 53 to avoid the rotation of the first rotating part 31 and a second rotating groove 54 to avoid the rotation of the second rotating part 41. The first rotating part 31 is provided with a first limiting part 33 and a second locking part 34, and the second rotating part 41 is provided with a second limiting part 43 and a second locking part 44. The first rotating groove 53 is provided with a first limiting boss 55, and the second rotating groove 54 is provided with a second limiting boss 57. The limiting part located on the rotating part is also located in the corresponding rotating groove, and rotates in the rotating groove with the rotation of the connecting member relative to the rotating member 5. In the normal state, the first limiting boss 55 abuts against the first limiting part 33, and the second limiting boss 57 abuts against the second limiting part 43.

[0059] The rotating member 5 is provided with a first locking platform 56 near the first rotating groove 53, and the first locking platform 56 extends towards the first connecting member 3 and all the way to the edge of the rotating member 5. Similarly, the rotating member 5 is provided with a second locking platform 58 near the second rotating groove 54, and extends towards the second connecting member 4 and all the way to the edge of the rotating member 5. In the extended state, the first locking platform 56 abuts against the first locking part 34, and the second locking platform 58 abuts against the second locking part 44.

[0060] After the state is switched, it can remain stable. Especially in the normal state, after the limiting part abuts against the limiting boss, it can prevent the movable support 22 from shaking on the basic support 21. This solution achieves limiting through a simpler structure, improves stability, eliminates the need for more parts for limiting, facilitates assembly, and saves on parts costs.

[0061] More specifically, the rotating component 5 is a long strip-shaped part, with mounting portions 52 protruding at both ends. Two rotating parts can be positioned between the two mounting portions 52 to achieve rotation. The receiving portion 51 can conceal itself and the rotating parts in its normal state. The rotating parts are cylindrical and rotatably positioned in corresponding rotating grooves. A limiting portion and a locking portion are cut in the middle of the rotating part. This cutting is not a true cut, but rather refers to the rotating part not being a perfectly cylindrical shape, but rather forming an irregular shape with limiting and locking portions. Therefore, the limiting and locking portions are directly formed on the rotating part, eliminating the need for additional components for limiting, greatly reducing the number of components, facilitating assembly, and lowering costs. The thickness of the receiving portion 51 is less than the thickness of the mounting portion 52, and the depth of the rotating groove is less than the thickness of the rotating part. The rotating groove is primarily designed to avoid the rotating part, allowing the connecting part to rotate smoothly relative to the rotating component 5. The thinness of the receiving portion 51 reduces the overall material consumption of the rotating component 5, and the shallowness of the rotating groove accommodates the receiving portion 51. The first connecting part 3, the second connecting part 4, and the rotating part 5 are all metal parts, and the three are integrally formed.

[0062] Furthermore, the angle between the locking part and the limiting part on the same connector is 90°, and on the rotating member 5, the angle between the limiting boss and the locking platform on the same side is 90°. Similarly, when switching between the normal state and the extended state, the rotation angle between the first connector 3 and the rotating member 5 is 90°, and the rotation angle between the second connector 4 and the rotating member 5 is 90°. That is, in the normal state, the angle between the first locking part 34 and the first locking platform 56 is 90°, and in the extended state, the angle between the first limiting part 33 and the first limiting boss 55 is 90°, meaning that the rotation angle is 90° in both cases, ensuring that the movable support member 22 has a 180° rotation angle.

[0063] In this embodiment, it is necessary to ensure that in the normal state, the movable support 22 and the basic support 21 are stacked vertically. When switching to the extended state, the included angle between the movable support 22 and the basic support 21 is 180°, and the basic support 21 cannot rotate. The rotating part 5 is provided with a double rotating shaft for concealment, so both the rotating part 5 and the movable support 22 can rotate. In a single state switch, the rotating part 5 can rotate 90° relative to the basic support 21, and the movable support 22 can rotate 90° relative to the rotating part 5, which ensures that the final rotation angle of the movable support 22 is 180°. This is the significance of setting the above included angle.

[0064] To be more specific, such as Figure 6 , 7 As shown in Figures 9 and 14-17, both the first rotating shaft 9 and the second rotating shaft 10 include a damping sleeve 11 and a support shaft 12. The rotating component 5 has the same number of mounting holes 59 as the first rotating shaft 9 and the second rotating shaft 10. The first connecting component 3 and the second connecting component 4 have insertion holes 13 corresponding to the mounting holes 59. The damping sleeve 11 is provided in the mounting holes 59 and the insertion holes 13. The support shaft 12 is inserted into the damping sleeve 11. The damping sleeve 11 is configured to increase the rotational damping of the rotating component 5 and the first connecting component 3 and the second connecting component 4. The mounting hole 59 also has a limiting groove 591. The damping sleeve 11 has a limiting protrusion 111. The limiting protrusion 111 is set in the limiting groove 591. The damping sleeve 11 and the rotating component 5 have circumferential limiting to prevent relative rotation between them. When the connecting component rotates relative to the rotating component 5, the damping sleeve 11 can play a role and increase the rotational damping.

[0065] The damping sleeve 11 is a hollow column made of PUM material and is elastic. The support shaft 12 is inserted into the damping sleeve 11 and presses it outward. The damping sleeve 11, support shaft 12, mounting hole 59, and insertion hole 13 are all interference fit, mainly to increase the friction between the damping sleeve 11 and the insertion hole 13. Specifically, at least two circumferentially distributed expansion portions 112 are separated at the end of the damping sleeve 11 located at the bottom of the insertion hole 13. There is a gap between the expansion portions 112 in the circumferential direction. This is done to facilitate the insertion of the damping sleeve 11 into the insertion hole 13 and to facilitate expansion to achieve damping. In this embodiment, there are two expansion portions 112, and the width of both expansion portions 112 is smaller than the diameter of the damping sleeve 11.

[0066] The damping sleeve 11 is used to increase the rotational damping of the connector and the rotating part 5, realizing the damping suspension function. Structurally, it eliminates the need for multiple parts to increase damping, which is convenient for assembly and saves on parts costs. Functionally, the multi-purpose handrail with added damping can remain stationary when the movable support 22 rotates to any position, preventing the movable support 22 from suddenly tipping over due to gravity and avoiding hand pinching. The support shaft 12 is a metal shaft, which increases the connection strength, maintains the relative position between the movable support 22, the connector, and the basic support 21, and is also used to open the damping sleeve 11 to increase friction.

[0067] Furthermore, such as Figure 1 , 3 As shown in Figures 6 and 9, the movable support member 22 is rotatably mounted on the basic support member 21 via a state switching mechanism. In the normal state, the movable support member 22 is located above the basic support member 21, and the two are stacked together. At this time, the end faces of the movable support member 22 and the basic support member 21 that are close to or adjacent to each other form the component surface 7. In the extended state, both component surfaces 7 are exposed upwards and form the widened support surface 62. The movable support member 22 located above does not need to avoid the support component 1, maintaining the integrity of the movable support member 22 and increasing the area of ​​the widened support surface 62, making it more practical. Anti-slip pads 8 are provided on both component surfaces 7 to increase the friction of the widened support surface 62, preventing items from sliding or falling after placement. In the extended state, the state switching mechanism is exposed on the upper surfaces of the movable support member 22 and the basic support member 21, forming part of the widened support surface 62.

[0068] There are many forms of existing support components 1. To improve the effectiveness of this solution, a movable support component 1 is adopted. The specific structure of the support component 1 will not be described again. The support component 1 includes a rotating rod 101, a rotating seat 102, and a support frame 103. The support frame 103 is used to connect the seat, the rotating seat 102 is mounted on the support frame 103, one end of the rotating rod 101 is rotatably connected to the rotating seat 102, and the basic support member 21 is rotatably mounted on the other end of the rotating rod 101. In the extended state, the small table can move in multiple dimensions like the armrest, moving to the position required by the user, making it more versatile. The support frame 103 includes a fixed support member 1031 and a lifting support member 1032, and the rotating seat 102 is mounted on the lifting support member 1032. This versatile small table is more advantageous, more flexible, and provides a better user experience than existing small tables converted from non-armrests. In addition, the support component 2 can also be tilted and rotated on the support component 1.

[0069] When this multi-purpose armrest is used in a seat, armrests will be provided on both sides of the seat, and at least one armrest will be this multi-purpose armrest. In its normal state, the multi-purpose armrest is used to support the human arm. In its extended state, the multi-purpose armrest can also be used as a small table to support items.

Claims

1. A rotational damping structure, characterized in that: It includes a connector and a rotating component. The connector and the rotating component are rotatably connected by a rotating shaft. The rotating shaft includes a damping sleeve and a support shaft. The rotating component has a mounting hole, and the connector has a corresponding insertion hole. The damping sleeve is inserted into the mounting hole and the insertion hole, and the support shaft is inserted into the damping sleeve. The damping sleeve is configured to increase the rotational damping of the rotating component and the connector.

2. The rotational damping structure according to claim 1, characterized in that: The damping sleeve is elastic, and the support shaft is inserted into the damping sleeve and presses the damping sleeve outward. The damping sleeve, support shaft, mounting hole, and insertion hole are all interference fit.

3. The rotational damping structure according to claim 1, characterized in that: The mounting hole is also provided with a limiting groove, and the damping sleeve is provided with a limiting protrusion, which is set in the limiting groove.

4. The rotational damping structure according to claim 1, characterized in that: The damping sleeve at the bottom of the socket has at least two circumferentially distributed expansion portions, with a gap between the expansion portions in the circumferential direction.

5. The rotational damping structure according to claim 4, characterized in that: There are two expansion sections, and the width of both expansion sections is smaller than the diameter of the damping sleeve.

6. The rotational damping structure according to claim 1, characterized in that: The damping sleeve is a hollow column shape and is made of PUM material.

7. The rotational damping structure according to claim 1, characterized in that: The support shaft is a metal shaft.

8. A handrail, characterized in that: The system includes a basic support, a movable support, and a rotation damping structure as described in any one of claims 1-7. The rotation damping structure has two connecting members, each of which is connected to a rotating member via at least one of the rotating shafts. The two connecting members are a first connecting member and a second connecting member. The first connecting member is connected to the basic support, and the second connecting member is connected to the movable support. The movable support is rotatably mounted on the movable support through the rotation damping structure. When the movable support is flipped over to the top of the basic support, the handrail is used to support the arm; when the movable support is flipped to the side of the basic support, the handrail is used to place items.

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