Multi-joint armrest and seat with same

Abstract

The multi-joint armrest comprises an armrest body, a base, a connecting outer shell, a connecting inner shell, a first swing rod and a second swing rod, the base comprises a mounting plate and a switching end, the connecting outer shell is rotationally arranged on the switching end, the connecting inner shell is arranged in the connecting outer shell in a sliding mode, and the first swing rod and the second swing rod are arranged on the mounting plate. The first swing rod is rotationally arranged in the connecting inner shell and is provided with a clamping part and a sliding hole extending in the length direction of the first swing rod, the second swing rod is rotationally connected with the connecting outer shell and is provided with a locking part, and the upper section of the second swing rod penetrates through the sliding hole and is in sliding fit with the first swing rod; the first swing rod is configured to swing between a first position and a second position and drive the second swing rod to swing between a third position and a fourth position; the clamping part can clamp the connecting inner shell relative to the connecting outer shell; and the locking part can lock the connecting shell relative to the switching end. By means of the armrest, swing and lifting adjustment of the armrest body relative to the seat frame can be achieved in single operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of seat, specifically to a multi-joint handrail and seat with same. BACKGROUND

[0002] The handrail of the seat can provide support for the arm of the user, and can reduce the fatigue of the user's arm. For users of different heights and body shapes, the appropriate position and inclination angle of the handrail are different, therefore, the handrail of part of the seat in the related art has the functions of lifting and inclination angle adjustment. However, in order to realize the above-mentioned lifting and inclination angle adjustment functions, the existing handrail needs to be provided with a lifting adjustment mechanism and an inclination angle adjustment mechanism. In actual application, the user needs to separately operate the lifting adjustment mechanism and the inclination angle adjustment mechanism, which is relatively cumbersome. Moreover, when the handrail is in the appropriate position, the inclination angle and the height of the handrail relative to the seat frame are fixed values, but when the above-mentioned handrail is applied, the height position of the handrail body will be changed when the inclination angle is adjusted, so that the user often needs to adjust repeatedly for several times to reach the required position. SUMMARY

[0003] The utility model aims at providing a multi-joint handrail and seat with same, which can simultaneously adjust the height position and the inclination angle of the handrail relative to the seat frame in a single operation.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The multi-joint handrail comprises a handrail body, and further comprises:

[0006] A base comprises a mounting plate for mounting with a seat frame of a seat and an adapter end head provided on the mounting plate;

[0007] A connecting shell is rotatably provided on the adapter end head around a set axis, and the set axis extends along the left-right direction of the seat;

[0008] A connecting inner shell is inserted into the connecting shell and is slidably arranged along a set direction, the handrail body is arranged at the upper end of the connecting inner shell, and the set direction intersects with the horizontal direction;

[0009] A first swing rod is rotatably arranged in the connecting inner shell and is formed with an engaging portion and a sliding hole extending along the length direction thereof;

[0010] A second swing rod is rotatably connected with the connecting shell and is located in the connecting inner shell, the second swing rod is formed with a locking portion, and the upper segment of the second swing rod passes through the sliding hole and is slidably matched with the first swing rod;

[0011] The first swing lever is configured to swing between a first position and a second position in response to an external force and drive the second swing lever to swing between a third position and a fourth position.

[0012] The clamping portion clamps the connection inner shell relative to the connection outer shell when the first swing lever is at the first position, and releases the clamping when the first swing lever is at the second position.

[0013] The locking portion locks the connection outer shell relative to the adapter head when the second swing lever is at the third position, and releases the locking when the second swing lever is at the fourth position.

[0014] Preferably, the connection outer shell is provided with a plurality of bayonets distributed along a specified direction, the connection inner shell is provided with a first avoiding opening, the clamping portion extends from the first avoiding opening, and the clamping portion is clamped with the bayonet when the first swing lever is at the first position, and is released from the bayonet when the first swing lever is at the second position.

[0015] Preferably, the adapter head is provided with a plurality of clamping grooves along the circumference of the specified axis, the connection outer shell is provided with a second avoiding opening, the locking portion extends from the second avoiding opening, and the locking portion is locked with the clamping groove when the second swing lever is at the third position, and is released from the clamping groove when the second swing lever is at the fourth position.

[0016] Preferably, the clamping grooves are formed on the adapter head; or, the multi-joint handrail further comprises a fixed block fixedly arranged on the adapter head, and the clamping grooves are formed on the fixed block.

[0017] Preferably, the connection outer shell comprises a first outer shell and a second outer shell fixedly arranged inside the first outer shell, the connection inner shell is located in the second outer shell, the second swing lever is rotatably arranged on the inner wall of the second outer shell through a rotating shaft, and the lower end of the first outer shell is rotatably connected with the adapter head.

[0018] Preferably, the adapter head is formed with an adapter convex ring and a connecting shaft located in the middle of the adapter convex ring, the lower end of the first outer shell is formed with a fitting groove matched with the adapter convex ring and a rotating hole matched with the connecting shaft, the connecting shaft is rotatably inserted into the rotating hole, and the adapter convex ring is rotatably arranged in the fitting groove.

[0019] Preferably, the multi-joint handrail further comprises a first reset member and a second reset member, the first reset member is arranged between the first swing lever and the connection inner shell and presses the first swing lever so that the first swing lever has a tendency to remain at the first position, and the second reset member is arranged between the second swing lever and the connection outer shell and presses the second swing lever so that the second swing lever has a tendency to remain at the third position.

[0020] Preferably, the base further comprises a first connecting arm and a second connecting arm, the adapter head is fixedly arranged at one end of the second connecting arm, one end of the first connecting arm is fixedly connected to the mounting plate, and the other end of the first connecting arm is rotatably arranged relative to the other end of the second connecting arm about a first predetermined axis, and the first predetermined axis extends along the height direction of the seat.

[0021] Preferably, the multi-joint armrest further comprises a locking assembly, one of the connecting member and the elastic bead is fixedly arranged on the first connecting arm, and the other is fixedly arranged on the second connecting arm, a plurality of positioning grooves distributed about the first predetermined axis are arranged on the connecting member, the positioning grooves are in the shape of a spherical segment, and the bead body of the elastic bead is clamped into the positioning grooves.

[0022] In addition, in order to achieve the above-mentioned purpose, the utility model also adopts the following technical scheme:

[0023] The seat comprises a seat frame, and the multi-joint armrest is mounted on the seat frame through the mounting plate.

[0024] Compared with the prior art, the utility model has the beneficial effects that:

[0025] The armrest body can move along a set direction relative to the connecting outer shell (and the base), so as to realize the position adjustment of the armrest body relative to the seat frame of the seat along the height direction; the armrest body (and the connecting inner shell) can rotate relative to the base about a set axis along with the connecting outer shell, so as to realize the position adjustment and the inclination adjustment of the armrest body relative to the seat frame along the front-back direction. The clamping part is formed on the first swing rod, and the locking part is formed on the second swing rod; the user can drive the first swing rod and the second swing rod to swing by exerting external force on the first swing rod, so as to release the clamping of the connecting inner shell relative to the connecting outer shell and the locking of the connecting outer shell relative to the adapter head, thereby realizing the swing and the lifting adjustment of the armrest body relative to the base in a single pressing operation of the first swing rod, and reducing the operation difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A structural schematic diagram of a multi-joint armrest provided by the embodiment of the application;

[0027] Figure 2 An exploded view of the multi-joint armrest;

[0028] Figure 3 is Figure 2 Another view of the exploded view;

[0029] Figure 4Figure 6 is a longitudinal sectional view of the multi-joint handrail when the first swing lever and the second swing lever are respectively in the first position and the third position;

[0030] Figure 5 Figure 7 is a longitudinal sectional view of the multi-joint handrail when the first swing lever and the second swing lever are respectively in the second position and the fourth position;

[0031] Figure 6 Figure 8 is an assembly exploded view of the first connecting arm and the second connecting arm in the embodiment;

[0032] Figure 7 Figure 9 is another perspective view of the assembly exploded view in Figure 8. Figure 6 Figure 10 is another perspective view of the assembly exploded view in Figure 8.

[0033] Wherein, 1, handrail body; 2, base; 20, mounting plate; 21, first connecting arm; 210, first mounting groove; 22, second connecting arm; 220, adapter end; 221, second mounting groove; 23, fixed block; 230, clamping groove; 3, connecting shell; 30, first shell; 300, second avoiding opening; 301, rotating hole; 302, intermediate shell; 31, second shell; 310, bayonet; 311, adapter hole; 4, connecting inner shell; 40, shell segment; 400, first avoiding opening; 401, adapter groove; 41, cover plate; 5, first swing lever; 50, clamping portion; 51, pressing portion; 52, sliding hole; 53, pressing portion; 54, first rotating shaft; 55, first reset member; 6, second swing lever; 60, locking portion; 61, second rotating shaft; 62, second reset member; 7, locking assembly; 70, connecting member; 700, circular base plate; 701, positioning groove; 702, connecting block; 703, adapter shaft; 71, elastic glass beads. DETAILED DESCRIPTION

[0034] The utility model will be further described below in combination with the drawings and specific embodiments, it is to be noted that, under the premise of not conflicting, the following described embodiments between or between technical features can be combined to form new embodiments. Except for the special description, the materials and equipment adopted in the embodiment can be purchased from the market. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the application and cannot be understood as a limitation on the application.

[0035] In the description of the present application, it needs to be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically specified and limited.

[0036] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "connected", "communicated", "connected" should be understood in a broad sense, for example, it can be fixedly connected, it can be connected through an intermediate medium, it can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The present embodiment provides a multi-joint handrail, as shown in Figure 1 、 Figure 2 and Figure 3 , which comprises a handrail body 1, a base 2, a connecting outer shell 3, a connecting inner shell 4, a first swing rod 5 and a second swing rod 6. The base 2 comprises a mounting plate 20 for mounting with the seat frame of the seat and an adapter end 220 provided on the mounting plate 20, the connecting outer shell 3 is rotatably provided on the adapter end 220 about a set axis, and the set axis extends along the left-right direction of the seat. The connecting inner shell 4 extends into the connecting outer shell 3 and is slidably arranged along a set direction, and the handrail body 1 is arranged at the upper end of the connecting inner shell 4. The "set direction intersects with the horizontal direction" means that the sliding direction of the connecting inner shell 4 can be the vertical direction (up-down direction), in which case the connecting inner shell 4 can drive the handrail body 1 to change position along the up-down direction of the seat when it slides; or it can mean the inclined direction relative to the horizontal direction, in which case the connecting inner shell 4 can drive the handrail body 1 to change position along both the up-down direction and the front-back direction of the seat when it slides.

[0038] Through the above arrangement, the handrail body 1 can move along the set direction relative to the connecting outer shell 3 (and the base 2) following the connecting inner shell 4, so as to realize the position adjustment of the handrail body 1 relative to the seat frame of the seat along the height direction; the handrail body 1 (and the connecting inner shell 4) can rotate relative to the base 2 about the set axis following the connecting outer shell 3, so as to realize the position adjustment and inclination adjustment of the handrail body 1 relative to the seat frame of the seat along the front-back direction.

[0039] Meanwhile, in this embodiment, the first swing link 5 is rotatably disposed within the connecting inner housing 4. The first swing link 5 is formed with a snap-fitting portion 50 and a sliding hole 52 extending along its length. The second swing link 6 is rotatably connected to the connecting outer housing 3 and located within the connecting inner housing 4. The second swing link 6 is formed with a locking portion 60. The upper portion of the second swing link 6 passes through the sliding hole 52 and slides with the first swing link 5. The first swing link 5 is configured to swing between a first position and a second position in response to an external force, and to drive the second swing link 6 between a third position and a fourth position. The provision of the sliding hole 52 prevents interference between the first and second swing links 5 and 6 during their swinging. The snap-fitting portion 50 engages the connecting inner housing 4 relative to the connecting outer housing 3 when the first swing link 5 is in the first position and releases the engagement when the first swing link 5 is in the second position. The locking portion 60 locks the connecting outer housing 3 relative to the adapter terminal 220 when the second swing link 6 is in the third position and releases the lock when the second swing link 6 is in the fourth position.

[0040] A snap-fitting portion 50 is formed on the first swing link 5, and a locking portion 60 is formed on the second swing link 6. The user can apply an external force to the first swing link 5 to drive the first and second swing links 5 and 6 to swing, thereby releasing the engagement of the connecting inner shell 4 with the connecting outer shell 3 and the locking of the connecting outer shell 3 with the adapter terminal 220. Thus, the armrest body 1 can be swung and raised and lowered relative to the base 2 in a single pressure operation on the first swing link 5, reducing the difficulty of operation. Figure 2 As shown in FIG, a pressing portion 51 for pressing the second swing rod 6 is formed at the lower end of the first swing rod 5. When the first swing rod 5 swings, the pressing portion 51 presses the second swing rod 6 to drive the second swing rod 6 to swing.

[0041] Specifically in this embodiment, a plurality of bayonet holes 310 distributed along a set direction are provided on the connecting outer shell 3, and a first avoidance hole 400 is provided on the connecting inner shell 4. Figure 3 、 Figure 4 and Figure 5 As shown in FIG, the engaging portion 50 extends from the first escape opening 400 and engages with the catch 310 when the first rocker 5 is in the first position, and disengages from the catch 310 when the first rocker 5 is in the second position. Furthermore, a plurality of slots 230 are provided on the adapter terminal 220 along the circumference of the set axis, and the connecting housing 3 is provided with a second escape opening 300. The locking portion 60 extends from the second escape opening 300 and locks with the slots 230 when the second rocker 6 is in the third position, and disengages from the slots 230 when the second rocker 6 is in the fourth position. This structural design enables the locking and unlocking functions of the first rocker 5 and the second rocker 6 to be realized.

[0042] It should be noted that the multi-joint handrail in the embodiment further comprises a fixed block 23 fixedly arranged on the adapter end 220, and a clamping groove 230 is formed on the fixed block 23. In alternative embodiments, the clamping groove 230 can also be directly formed on the adapter end 220.

[0043] The connecting outer shell 3 in the embodiment comprises a first shell 30 and a second shell 31 fixedly arranged inside the first shell 30, and the connecting inner shell 4 is located inside the second shell 31. The second swing rod 6 is rotatably arranged on the inner wall of the second shell 31 through a rotating shaft. The lower end of the first shell 30 is rotatably connected with the adapter end 220. The second avoiding opening 300 comprises a first opening arranged on the first shell 30 and a second opening arranged on the second shell 31. Further, the adapter end 220 in the embodiment is formed with an adapter convex ring and a connecting shaft located in the middle of the adapter convex ring. The lower end of the first shell 30 is formed with a fitting groove matched with the adapter convex ring and a rotating hole 301 matched with the connecting shaft. The connecting shaft is rotatably inserted into the rotating hole 301, and the adapter convex ring is rotatably arranged in the fitting groove. Through the rotating cooperation of the adapter convex ring and the fitting groove, and the rotating cooperation of the connecting shaft and the rotating hole 301, the rotating stability between the first shell 30 and the adapter end 220 can be improved. In addition, the connecting outer shell 3 is designed as a split first shell 30 and a second shell 31, which facilitates the assembly operation of each component.

[0044] The upper end of the first swing rod 5 in the embodiment is formed with a pressing part 53 extending out of the connecting inner shell 4, which is used for the user to apply an external force to the first swing rod 5. The multi-joint handrail further comprises a first reset member 55 arranged between the first swing rod 5 and the connecting inner shell 4 and pressing the first swing rod 5 so that the first swing rod 5 has a tendency to remain in the first position. Specifically, the connecting inner shell 4 comprises a shell segment 40 and a cover plate 41. The inside of the shell segment 40 is formed with a cavity, and the first swing rod 5 is located in the cavity. The first reset member 55 is a compression spring, which is arranged between the pressing part 53 and the inner wall of the cover plate 41, and always applies a downward force to the pressing part 53. When the user pulls the pressing part 53 upward, the elastic force of the first reset member 55 can be overcome to drive the first swing rod 5 to swing. The multi-joint handrail further comprises a second reset member 62 arranged between the second swing rod 6 and the connecting outer shell 3 and pressing the second swing rod 6 so that the second swing rod 6 has a tendency to remain in the third position. Specifically, the second reset member 62 is also a compression spring. The connecting outer shell 3 further comprises an intermediate shell 302 fixedly arranged on the inner wall of the second shell 31, and the second reset member 62 is arranged between the intermediate shell 302 and the second swing rod 6. In other alternative embodiments, the first reset member 55 and the second reset member 62 can also be elastic bodies such as metal elastic sheets.

[0045] The first swing lever 5 is provided with a first rotating shaft 54, and the second swing lever 6 is provided with a second rotating shaft 61. The first swing lever 5 is rotatably arranged on the inner wall of the connecting inner shell 4 through the first rotating shaft 54, Figure 3 As shown in FIG. 6, the inner wall of the upper end of the connecting inner shell 4 is provided with a rotating groove 401 for connecting the first rotating shaft 54. The second swing lever 6 is rotatably arranged on the inner wall of the second outer shell 31 through the second rotating shaft 61, Figure 2 As shown in FIG. 7, the second outer shell 31 is provided with a rotating hole 311 for connecting the second rotating shaft 61.

[0046] As shown in FIGS. 1-3, Figure 6 and Figure 7 The base 2 of the present embodiment further comprises a first connecting arm 21 and a second connecting arm 22. The connecting end 220 is fixedly arranged on one end of the second connecting arm 22, and one end of the first connecting arm 21 is fixedly connected to the mounting plate 20. The other end of the first connecting arm 21 is rotatably arranged relative to the other end of the second connecting arm 22 about a first predetermined axis, and the first predetermined axis extends along the height direction of the seat. Through the above structural design, the position of the armrest body 1 relative to the seat frame in the horizontal direction can be adjusted by the relative rotation of the first connecting arm 21 and the second connecting arm 22.

[0047] Further, the multi-joint armrest further comprises a locking assembly 7, which comprises a connecting member 70 and a spring bead 71. One of the connecting member 70 and the spring bead 71 is fixedly arranged on the first connecting arm 21, and the other is fixedly arranged on the second connecting arm 22. In the present embodiment, the connecting member 70 is fixedly arranged on the second connecting arm 22, and the spring bead 71 is fixedly arranged on the first connecting arm 21. The connecting member 70 is provided with a plurality of positioning grooves 701 distributed about the first predetermined axis, and the positioning grooves 701 are in the shape of a spherical segment. The bead of the spring bead 71 is clamped into the positioning grooves 701.

[0048] The elastic glass bead 71 is a commercially available component, which generally comprises a sleeve, a compression spring arranged in the sleeve, and a bead arranged at the opening of the sleeve. The bead is generally spherical, and the inner diameter of the sleeve is slightly larger than the diameter of the bead so that the bead can slide or roll in the sleeve. The opening of the sleeve is narrowed so that the size of the opening of the sleeve is smaller than the diameter of the bead, and the bead can be prevented from coming out of the sleeve. The compression spring presses the bead so that the bead has a tendency to move out of the sleeve, and under the action of no external force, the bead will partially extend out of the sleeve. The positioning groove 701 is in the shape of a spherical segment, and the positioning groove 701 is arranged to be matched with the part of the bead extending out of the sleeve, so that the bead can be clamped in the positioning groove 701 to keep the second connecting arm 22 stationary relative to the first connecting arm 21. When a user applies a certain force to the first connecting arm 21 or the second connecting arm 22 along the circumference of the first predetermined axis from the outside, the arc surface between the bead and the inner wall of the positioning groove 701 will transmit a part of the force to the compression spring, so as to compress the compression spring and make the bead retract into the sleeve, until the bead comes out of the positioning groove 701. In the above process, the second connecting arm 22 slightly swings relative to the first connecting arm 21, until the swing member continues to swing so that the adjacent positioning groove 701 is aligned with the bead, and the bead is clamped in the positioning groove 701 aligned with the bead under the action of the compression spring.

[0049] The connecting member 70 in the embodiment comprises a circular base plate 700, a connecting block 702 formed on one side of the circular base plate 700, and an adapter shaft 703 formed on the other side of the circular base plate 700. The second connecting arm 22 is provided with a second mounting groove 221, and the connecting member 70 is inserted into the second mounting groove 221 through the connecting block 702 to be fixed on the second connecting arm 22. The first connecting arm 21 is provided with a first mounting groove 210, and a plug-in groove for fixing the elastic glass bead 71 is arranged on the inner wall of the first mounting groove 210. The elastic glass bead 71 is fixedly installed in the first mounting groove 210 by being tightly inserted into the plug-in groove through the sleeve. Meanwhile, a connecting hole matched with the adapter shaft 703 is formed on the bottom wall of the first mounting groove 210, and the adapter shaft 703 is rotatably inserted into the connecting hole.

[0050] In the embodiment, the handrail body 1 is arranged at the upper end of the connecting inner shell 4. Optionally, the handrail body 1 can be fixedly installed on the connecting inner shell 4, or the handrail body 1 can be rotatably arranged on the connecting inner shell 4. Specifically, the handrail body 1 can be rotatably arranged on the top of the connecting inner shell 4 about a second predetermined axis extending along the height direction of the seat. Alternatively, the handrail body 1 can be arranged to be slidable relative to the connecting inner shell 4 along the length direction of the handrail body 1. The above structure design can refer to the arrangement of the handrail body 1 in the prior art, which will not be described herein.

[0051] The armrest body 1 provided by the embodiment can be applied to a seat, and the seat comprises a seat frame and the armrest body 1.

[0052] It should be noted that, in the embodiment, the "left" and "right" in the left-right direction of the seat refer to the left and right sides of the user after the user sits on the seat. The "front" in the front-rear direction of the seat refers to the direction of the user's vision after the user sits on the seat, and the reverse direction is "rear".

[0053] Finally, it should be noted that the above-mentioned embodiments are only optional embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. Multi-articulated handrail comprising a handrail body, characterized in that, The multi-joint armrest further comprises: a base including a mounting plate for mounting with a seat frame of a seat and an adapter end head provided on the mounting plate; a connecting outer shell rotatably provided on the adapter end head about a set axis extending in a left-right direction of the seat; a connecting inner shell extending into the connecting outer shell and slidably provided in a set direction intersecting with a horizontal direction, the armrest body being provided on an upper end of the connecting inner shell; a first swing lever rotatably provided in the connecting inner shell and formed with an engaging portion and a sliding hole extending in a length direction thereof; a second swing lever rotatably connected with the connecting outer shell and located in the connecting inner shell, the second swing lever being formed with a locking portion, an upper section of the second swing lever passing through the sliding hole and slidably matched with the first swing lever; wherein the first swing lever is configured to swing between a first position and a second position in response to an external force and drive the second swing lever to swing between a third position and a fourth position; the engaging portion engaging the connecting inner shell relative to the connecting outer shell when the first swing lever is at the first position and disengaging the connecting inner shell relative to the connecting outer shell when the first swing lever is at the second position; the locking portion locking the connecting outer shell relative to the adapter end head when the second swing lever is at the third position and disengaging the connecting outer shell relative to the adapter end head when the second swing lever is at the fourth position.

2. The multi-articulating handrail of claim 1, wherein, the connecting outer shell is provided with a plurality of clamping openings distributed in the set direction, the connecting inner shell is provided with a first avoiding opening, the engaging portion extends out of the first avoiding opening, and the engaging portion engages the clamping openings when the first swing lever is at the first position and disengages the clamping openings when the first swing lever is at the second position.

3. The multi-articulating handrail of claim 1, wherein, the adapter end head is provided with a plurality of clamping grooves in a circumferential direction of the set axis, the connecting outer shell is provided with a second avoiding opening, the locking portion extends out of the second avoiding opening, and the locking portion engages the clamping grooves when the second swing lever is at the third position and disengages the clamping grooves when the second swing lever is at the fourth position.

4. The multi-articulating handrail of claim 3, wherein, the clamping grooves are formed on the adapter end head; or, the multi-joint armrest further comprises a fixing block fixedly provided on the adapter end head, and the clamping grooves are formed on the fixing block.

5. The multi-articulating handrail of claim 3, wherein, the connecting outer shell comprises a first outer shell and a second outer shell fixedly provided in an interior of the first outer shell, the connecting inner shell is located in the second outer shell, the second swing lever is rotatably provided on an inner wall of the second outer shell through a rotating shaft, and a lower end of the first outer shell is rotatably connected with the adapter end head.

6. The multi-articulating handrail of claim 5, wherein, the adapter end head is formed with an adapter protruding ring and a connecting shaft located in a middle portion of the adapter protruding ring, the lower end of the first outer shell is formed with a fitting groove matched with the adapter protruding ring and a rotating hole matched with the connecting shaft, the connecting shaft is rotatably inserted into the rotating hole, and the adapter protruding ring is rotatably provided in the fitting groove.

7. The multi-articulating handrail of any of claims 1 to 6, wherein, the multi-joint armrest further comprises a first reset member and a second reset member, the first reset member is provided between the first swing lever and the connecting inner shell and presses the first swing lever so that the first swing lever has a tendency to be kept at the first position, and the second reset member is provided between the second swing lever and the connecting outer shell and presses the second swing lever so that the second swing lever has a tendency to be kept at the third position.

8. The multi-articulating handrail of any of claims 1 to 6, wherein, The base further comprises a first connecting arm and a second connecting arm, the adapter tip is fixedly arranged at one end of the second connecting arm, one end of the first connecting arm is fixedly connected to the mounting plate, and the other end of the first connecting arm is rotatably arranged relative to the other end of the second connecting arm about a first predetermined axis, and the first predetermined axis extends along the height direction of the seat.

9. The multi-articulating handrail of claim 8, wherein, The multi-joint armrest further comprises a locking assembly, the locking assembly comprises a connecting member and a spring bead, one of the connecting member and the spring bead is fixedly arranged on the first connecting arm, and the other is fixedly arranged on the second connecting arm, a plurality of positioning grooves distributed about the first predetermined axis are arranged on the connecting member, the positioning grooves are in the shape of a spherical segment, and the bead body of the spring bead is clamped into the positioning grooves.

10. A seat comprising a seat frame, characterized by The seat further comprises the multi-joint armrest according to any one of claims 1 to 9, and the multi-joint armrest is mounted on the seat frame through the mounting plate.

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