Armrest device and seat

Abstract

The invention discloses an armrest device and a seat. The armrest device comprises a connecting arm and a supporting assembly, and a connecting base is arranged at the upper end of the connecting arm; the supporting assembly comprises a handrail seat, a rotating supporting piece, a rotating arm and a tensioning spring, the rotating supporting piece is arranged on the connecting seat, the rotating supporting piece is provided with a first rotating shaft and a second rotating shaft, the second rotating shaft is located on the rear side above the first rotating shaft, the handrail seat is provided with a first connecting shaft and a second connecting shaft, and the second connecting shaft is located above the first connecting shaft; the rotating arm comprises a first supporting arm and a second supporting arm, the two ends of the first supporting arm are connected with the first rotating shaft and the second connecting shaft respectively, the two ends of the second supporting arm are connected with the second rotating shaft and the second connecting shaft respectively, and the two ends of the tensioning spring are connected with the first supporting arm and the second supporting arm respectively; when the rotating arm rotates upwards, the first supporting arm and the second supporting arm are matched to pull the armrest base to rotate so that the armrest base can incline, and therefore the elbows of a user can be well supported.

Description

Technical Field

[0001] The present invention relates to the technical field of seats, and in particular to an armrest device and a seat. Background Art

[0002] In the related art, the chair has armrests, but when different users use the chair for work, there is a certain height difference between the elbows and the desktop of the office desk. Traditional armrests can only be adapted by raising and lowering the height. However, due to the differences in office habits among different groups of people, some users are accustomed to working with their elbows slightly tilted, and the existing armrest types cannot effectively support the user's elbows in this case. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an armrest device that can adjust the height and tilt angle of the armrest seat and the armrest seat, greatly improving the comfort and support of users when working.

[0004] In a second aspect, the present invention also proposes a chair using the above-mentioned armrest device.

[0005] According to the first aspect of the present invention, an armrest device is provided, comprising: A connecting arm, with a connecting seat at the upper end; A support assembly, comprising an armrest pad, an armrest seat, a rotating support, a rotating arm, and a tensioning spring, wherein the rotating support is arranged on the upper side of the connecting seat, the rotating support is provided with a first rotating shaft and a second rotating shaft, the second rotating shaft is located at the rear side above the first rotating shaft, the armrest seat is provided with a first connecting shaft and a second connecting shaft, the second connecting shaft is located above the first connecting shaft, the rotating arm comprises a first supporting arm and a second supporting arm, the two ends of the first supporting arm are respectively connected to the first rotating shaft and the second connecting shaft, the two ends of the second supporting arm are respectively connected to the second rotating shaft and the second connecting shaft, one end of the tensioning spring is connected to the first supporting arm, and the other end is connected to the second supporting arm; Wherein, the armrest pad is arranged on the upper side of the armrest seat, and when the rotating arm rotates upward, the first supporting arm cooperates with the second supporting arm to pull the armrest seat to rotate, thereby enabling the upper end surface of the armrest pad.

[0006] The armrest device provided in accordance with the embodiment of the first aspect of the present invention has at least the following beneficial effects: by rotating the first rotating axis and the second rotating axis on the support member, and the first connecting axis and the second connecting axis on the armrest seat, in coordination with the differentiated rotating trajectories of the first support arm and the second support arm, the armrest seat and the armrest pad can follow the rotation and tilt of the rotating arm, thereby providing the user with a more fitting and comfortable support, thereby improving the user's comfort when using the chair.

[0007] The armrest device provided in the embodiment of the first aspect of the present invention also includes a gear adjustment component, wherein the gear adjustment component includes a ratchet, a locking member, an elastic member and a separating member, wherein the ratchet is arranged on the front side of the rotating support and has a plurality of ratchet grooves, the locking member is rotatably connected to an end of the connecting arm close to the rotating support, an end of the locking member close to the ratchet is provided with a ratchet, and an end away from the ratchet is provided with an abutment plate, one end of the elastic member is connected to the rotating arm, and the other end abuts the abutment plate, so that the ratchet is stuck in the ratchet; the separating member is rotatably connected to the rotating support and is located on one side of the ratchet, the separating member is provided with a limiting groove, and the limiting column passes through The locking member and the separating member are provided with a separation guide rod and a separation groove on one side of the separating member facing the ratchet tooth. The rotating arm is rotated upward to drive the locking member and the separating member to rotate upward so that the ratchet tooth passes through a plurality of the ratchet grooves in sequence and the limiting groove moves relative to the limiting column. When the limiting column abuts against the lower end of the limiting groove, the ratchet tooth is separated from the ratchet groove and is inserted into the separating groove. The rotating arm is rotated downward to drive the locking member and the separating member to rotate downward. When the limiting column abuts against the upper end of the limiting groove, the separation guide rod can abut against the locking member to guide the locking member to rotate, and the ratchet tooth is separated from the separation groove and is inserted into the ratchet groove.

[0008] According to the armrest device provided by the embodiment of the first aspect of the present invention, a first guide bevel is provided on the side of the ratchet facing the separation member, and a second guide bevel is provided on the side of the separation member facing the ratchet and extending to the separation groove, and when the first guide bevel abuts against the second guide bevel, the ratchet can slide into the separation groove along the second guide bevel.

[0009] According to the armrest device provided by the embodiment of the first aspect of the present invention, the lower side of the second support arm is provided with an upper hook extending downward and forward, the upper side of the first support arm is provided with a lower hook extending upward and backward, and the two ends of the tensioning spring are respectively connected to the upper hook and the lower hook.

[0010] According to the armrest device provided by the embodiment of the first aspect of the present invention, the lower end of the rotating support is provided with a plug-in block, the upper end of the connecting seat is provided with a plug-in slot, and the plug-in block is plugged into the plug-in slot.

[0011] According to the armrest device provided by the embodiment of the first aspect of the present invention, the connecting seat can be rotatably connected to the connecting arm.

[0012] According to the armrest device provided by the embodiment of the first aspect of the present invention, the lower end surface of the connecting seat is provided with a plurality of downwardly opening arc-shaped gear slots, and the upper end of the connecting arm is provided with a retractable gear column, the upper end of the gear column is hemispherical and snaps into the gear slot.

[0013] According to the armrest device provided by the embodiment of the first aspect of the present invention, the armrest pad is configured to be able to slide relative to the armrest seat.

[0014] According to the armrest device provided by the embodiment of the first aspect of the present invention, the armrest backrest is configured to be rotatable relative to the armrest seat.

[0015] The seat provided in the embodiment according to the second aspect of the present invention has all the beneficial effects of the embodiment according to the first aspect of the present invention.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 An overall schematic diagram of an armrest device provided by an embodiment of the present invention; Figure 2 A cross-sectional view of an armrest device is provided for an embodiment of the present invention; Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 A cross-sectional view of an armrest device from another angle is provided for an embodiment of the present invention; Figure 5 This is a schematic diagram of an exploded view of an armrest device provided in an embodiment of the present invention.

[0018] The figures are as follows: Connecting arm 100; gear column 101; connecting seat 110; plug-in slot 111; Support assembly 200; armrest seat 210; first connecting shaft 211; second connecting shaft 212; rotating support member 220; first rotating shaft 221; second rotating shaft 222; limiting column 223; plug-in block 224; rotating arm 230; first supporting arm 231; second supporting arm 232; upper hook 233; lower hook 234; tension spring 240; armrest pad 250; The gear adjustment assembly 300 ; the ratchet 310 ; the locking member 320 ; the ratchet 321 ; the abutment plate 322 ; the elastic member 330 ; the separation member 340 ; the limiting groove 341 ; the separation guide rod 342 ; and the separation groove 343 . DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as up, down, left, right, etc., the orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0023] An embodiment of the present invention provides an armrest device, which is applied to a seat. The specific structure and function of the armrest device provided by the embodiment of the present invention will be further described below with reference to text and drawings.

[0024] Reference Figures 1 to 4According to the first aspect of the present invention, the armrest device provided by the embodiment comprises: a connecting arm 100 and a supporting assembly 200. The upper end of the connecting arm 100 is provided with a connecting seat 110 for connecting with the chassis or frame of the seat. The supporting assembly 200 comprises an armrest pad 250, an armrest seat 210, a rotating support 220, a rotating arm 230 and a tensioning spring 240. The rotating support 220 is fixed on the upper side of the connecting seat 110 and is provided with a first rotating shaft 221 and a second rotating shaft 222, wherein the second rotating shaft 222 is located at the rear side above the first rotating shaft 221, and this type of layout provides structural support for subsequent tilt adjustment. The armrest seat 210 is provided with a first connecting shaft 211 and a second connecting shaft 212, and the first connecting shaft 211 and the second connecting shaft 212 correspond to the first rotating shaft 221 and the second rotating shaft 222 on the rotating support 220. The rotating arm 230 is composed of a first supporting arm 231 and a second supporting arm 232. The two ends of the first support arm 231 are respectively connected to the first rotating shaft 221 and the second connecting shaft 212, while the two ends of the second support arm 232 are respectively connected to the second rotating shaft 222 and the second connecting shaft 212. Such a connection mode enables the rotating arm 230 to rotate around the rotating shaft and drive the armrest seat 210 to adjust the tilt. One end of the tension spring 240 is connected to the first support arm 231, and the other end is connected to the second support arm 232. The tension spring 240 provides a certain tension for the rotating arm 230, so that the armrest seat 210 can remain stable after adjusting the tilt angle, and will not easily change its position due to external force.

[0025] When the user uses the armrest device, the height and tilt angle of the armrest seat 210 and the armrest pad 250 can be adjusted by rotating the rotating arm 230 upward. Specifically, during the rotation process, due to the different positions of the first rotating shaft 221 and the second rotating shaft 222, the rotation trajectories of the first support arm 231 and the second support arm 232 will also be different. This difference in rotation trajectory enables the first support arm 231 and the second support arm 232 to cooperate with pulling the armrest seat 210 for tilt adjustment during the rotation process. Users can easily adjust the tilt angle of the armrest seat 210 according to their office habits and comfort requirements, so as to obtain the best support effect.

[0026] According to the armrest device provided in the embodiment of the first aspect of the present invention, by rotating the first rotating axis 221 and the second rotating axis 222 on the support member 220, and the first connecting axis 211 and the second connecting axis 212 on the armrest seat 210, and cooperating with the differentiated rotating trajectories of the first support arm 231 and the second support arm 232, the armrest seat 210 can follow the rotation and tilt of the rotating arm 230, thereby providing the user with a more fitting and comfortable support, thereby improving the user's comfort when using the chair.

[0027] Reference Figures 2 to 4The armrest device provided according to the embodiment of the first aspect of the present invention further includes a gear adjustment assembly 300, which includes a ratchet 310, a locking member 320, an elastic member 330 and a separating member 340. The ratchet 310 is arranged at the front side of the rotating support 220 and has a plurality of ratchet grooves, which are used to cooperate with the ratchet teeth 321 on the locking member 320 to achieve the locking of the tilt angle of the armrest device. The locking member 320 is rotatably connected to one end of the connecting arm 100 close to the rotating support 220, and one end thereof is provided with a ratchet tooth 321 for being inserted into the ratchet groove of the ratchet 310, and the other end is provided with an abutment plate 322. One end of the elastic member 330 is connected to the rotating arm 230, and the other end abuts against the abutment plate 322 of the locking member 320. When the rotating arm 230 rotates, the elastic member 330 applies a force to the locking member 320 through the abutment plate 322, so that the ratchet 321 can be firmly stuck in the ratchet groove, thereby maintaining the inclination angle of the armrest device stable. The separation member 340 is rotatably connected to the rotating support member 220 and is located on one side of the ratchet 310. The separation member 340 is provided with a limiting groove 341, and the limiting column 223 is penetrated in this limiting groove 341. In addition, a separation guide rod 342 and a separation groove 343 are also provided on the side of the separation member 340 facing the ratchet 321. The design of the separation guide rod 342 and the separation groove 343 enables precise matching and separation between the ratchet 321 and the ratchet groove and the separation groove 343 when the rotating arm 230 rotates upward or downward.

[0028] When in use, when the user rotates the rotating arm 230 upward to adjust the inclination angle of the armrest device, the rotating arm 230 will drive the locking member 320 and the separating member 340 to rotate upward together. In this process, the ratchet 321 will pass through the multiple ratchet grooves on the ratchet 310 in sequence to adjust the inclination angle. At the same time, the limiting groove 341 will move relative to the limiting column 223. When the limiting column 223 abuts against the lower end of the limiting groove 341, if the user continues to rotate the rotating arm 230 upward, the ratchet 321 will separate from the ratchet groove at the uppermost end of the ratchet 310 and be stuck in the separating groove 343. At this time, the locking member 320 remains separated from the ratchet 310, the inclination angle of the armrest device is temporarily unlocked, and the rotating arm 230 can rotate downward freely.

[0029] On the contrary, when the user rotates the rotating arm 230 downward, the rotating arm 230 will drive the locking member 320 and the separating member 340 to rotate downward together. When the limiting column 223 abuts against the upper end of the limiting groove 341, the separating member 340 is fixed. If the user continues to rotate the rotating arm 230 downward, the locking member 320 will rotate downward relative to the separating member 340, and the separating guide rod 342 will abut against the locking member 320 and guide it to rotate. In this way, the ratchet 321 will separate from the separating groove 343 and re-engage in the ratchet groove. At this time, the rotating arm 230 can be rotated upward again to adjust the height of the rotating arm 230 and adjust the height and inclination of the armrest seat 210.

[0030] It is understandable that, through the design of the gear adjustment assembly 300, the user can more conveniently adjust and lock the inclination angle of the armrest device, thereby meeting the use requirements in different office scenes. At the same time, the design also improves the stability and durability of the armrest device.

[0031] Reference Figure 3 and Figure 4 According to the handrail device provided by the embodiment of the first aspect of the present invention, the ratchet 321 has a first guide bevel on the side facing the separator 340. The first guide bevel is provided so that when the ratchet 321 contacts the separator 340, a gradually increasing contact force can be generated, thereby guiding the ratchet 321 to move in a specific direction. At the same time, the separator 340 has a second guide bevel on the side facing the ratchet 321 that extends to the separation groove 343. The second guide bevel matches the first guide bevel to form a guide channel, so that the ratchet 321 can slide into the separation groove 343 more easily during the rotation process.

[0032] When the user adjusts the tilt angle of the armrest device so that the ratchet 321 needs to be separated from the ratchet wheel 310 and inserted into the separation groove 343, the cooperation of the first guide bevel and the second guide bevel plays a guiding role. As the rotating arm 230 continues to rotate, the first guide bevel of the ratchet 321 will contact the second guide bevel of the separation member 340, and the ratchet 321 will be subjected to a force along the direction of the second guide bevel, so that it is guided to slide into the separation groove 343 along the second guide bevel.

[0033] Reference Figure 2 and Figure 4 According to the armrest device provided by the embodiment of the first aspect of the present invention, an upper hook 233 extending downward and forward is designed on the lower side of the second support arm 232. The shape and position of the upper hook 233 can be set according to actual needs to ensure that it can be firmly connected to one end of the tension spring 240 and maintain a stable connection state during the adjustment process of the armrest device.

[0034] Correspondingly, a lower hook 234 extending upward and backward is provided on the upper side of the first support arm 231. The lower hook 234 cooperates with the upper hook 233, and the other end of the tension spring 240 is connected to the lower hook 234. This not only allows the tension spring 240 to be more evenly distributed on the rotating arm 230, but also improves the structural strength of the entire handrail device.

[0035] When the armrest device needs to adjust the height and tilt angle of the armrest base 210, the user operates the rotating arm 230 to rotate it upward or downward. In this process, the tension spring 240 always maintains appropriate tension on the rotating arm 230 through the connection between the upper hook 233 and the lower hook 234. This tension not only helps the rotating arm 230 to maintain smooth movement during the adjustment process, but also ensures that the armrest base 210 can stably remain in the desired position after being adjusted into place.

[0036] Reference Figure 4 and Figure 5 According to the armrest device provided by the embodiment of the first aspect of the present invention, a square plug-in block 224 is provided at the lower end of the rotating support 220, and a plug-in slot 111 matching the shape of the plug-in block 224 is provided at the upper end of the connecting seat 110. The plug-in block 224 is inserted into the plug-in slot 111. During the installation process, the user aligns the plug-in block 224 at the lower end of the rotating support 220 with the plug-in slot 111 at the upper end of the connecting seat 110, and then fixes it with a fastener. Due to the high matching degree between the plug-in block 224 and the plug-in slot 111, the installation process is very simple and does not require additional tools or complicated operations. At the same time, this plug-in connection method also makes the connection between the rotating support 220 and the connecting seat 110 more secure, and it is not easy to loosen or fall off even during long-term use.

[0037] Reference Figure 5 According to the armrest device provided by the embodiment of the first aspect of the present invention, the connecting seat 110 can be rotatably connected to the connecting arm 100, and the rotating arm 230 can drive the connecting seat 110 to rotate, so that the armrest seat 210 can achieve horizontal position adjustment. When the user needs to adjust the angle or position of the armrest device, the overall rotation of the armrest seat 210 can be achieved by gently rotating the connecting seat 110. This rotation is smooth and continuous, and will not affect the user's experience due to jamming or resistance during the rotation process. At the same time, since the rotational connection between the connecting seat 110 and the connecting arm 100 is stable, the armrest device can maintain stable performance even during long-term use, and will not loosen or shake.

[0038] Reference Figure 4 and Figure 5According to the armrest device provided by the embodiment of the first aspect of the present invention, the lower end surface of the connecting seat 110 is provided with a plurality of downwardly opening arc-shaped gear grooves (not shown in the figure), and the plurality of gear grooves are arranged at intervals along the circumference of the connecting seat 110. The upper end of the connecting arm 100 is provided with a retractable gear column 101, and the retractable function of the gear column 101 is realized by an internal spring mechanism. The upper end of the gear column 101 is hemispherical and is stuck in the gear groove.

[0039] When the armrest device needs to be adjusted to a specific position, the user only needs to drive the rotating support seat and the rotating seat to rotate through the rotating arm 230, so that the hemispherical upper end of the gear column 101 is aligned and inserted into different gear slots, thereby realizing the horizontal rotation adjustment of the armrest seat 210.

[0040] Reference Figure 1 and Figure 2 According to the armrest device provided by the embodiment of the first aspect of the present invention, the support assembly 200 further includes an armrest pad 250, which is configured to be able to slide relative to the armrest seat 210. The sliding armrest pad 250 allows the user to easily adjust the position of the armrest pad 250 according to their own usage habits and needs. Whether typing, writing or resting, the user can simply slide the armrest pad 250 to find the most suitable hand support position for themselves, thereby effectively reducing the pressure on the wrist and arm and improving the comfort of use.

[0041] It is understandable that the armrest pad 250 can slide relative to the armrest seat 210, which is a conventional technical means that can be used by those skilled in the art and will not be described in detail here.

[0042] Reference Figure 1 and Figure 2 According to the armrest device provided by the embodiment of the first aspect of the present invention, the armrest pad 250 is configured to be rotatable relative to the armrest seat 210. The rotatable armrest pad 250 allows the user to easily adjust the angle of the armrest pad 250 according to their own usage habits and needs, so that the armrest pad 250 can better support the user's hand.

[0043] It is understandable that the armrest pad 250 can rotate relative to the armrest seat 210 by conventional technical means that can be used by those skilled in the art, and will not be described in detail here.

[0044] The seat provided in the embodiment according to the second aspect of the present invention has all the beneficial effects of the embodiment according to the first aspect of the present invention.

[0045] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An armrest device, characterized in that: include: A connecting arm, with a connecting seat at the upper end; A support assembly, comprising an armrest pad, an armrest seat, a rotating support, a rotating arm, and a tensioning spring, wherein the rotating support is arranged on the upper side of the connecting seat, the rotating support is provided with a first rotating shaft and a second rotating shaft, the second rotating shaft is located at the rear side above the first rotating shaft, the armrest seat is provided with a first connecting shaft and a second connecting shaft, the second connecting shaft is located above the first connecting shaft, the rotating arm comprises a first supporting arm and a second supporting arm, the two ends of the first supporting arm are respectively connected to the first rotating shaft and the second connecting shaft, the two ends of the second supporting arm are respectively connected to the second rotating shaft and the second connecting shaft, one end of the tensioning spring is connected to the first supporting arm, and the other end is connected to the second supporting arm; Wherein, the armrest pad is arranged on the upper side of the armrest seat, and when the rotating arm rotates upward, the first supporting arm cooperates with the second supporting arm to pull the armrest seat to rotate, thereby enabling the upper end surface of the armrest pad.

2. The handrail device according to claim 1, characterized in that: The gear adjustment component also includes a gear adjustment component, which includes a ratchet, a locking piece, an elastic piece and a separating piece, wherein the ratchet is arranged on the front side of the rotating support and has a plurality of ratchet grooves, the locking piece is rotatably connected to one end of the connecting arm close to the rotating support, the end of the locking piece close to the ratchet is provided with a ratchet, and the end away from the ratchet is provided with an abutment plate, one end of the elastic piece is connected to the rotating arm, and the other end abuts the abutment plate, so that the ratchet is stuck in the ratchet; the separating piece is rotatably connected to the rotating support and is located on one side of the ratchet, a limiting column is provided on one side of the rotating support, the separating piece is provided with a limiting groove, and the limiting column is penetrated through The limiting groove, the separation guide rod and the separation groove are provided on the side of the separation piece facing the ratchet tooth. The rotating arm rotates upward, which can drive the locking piece and the separation piece to rotate upward, so that the ratchet passes through multiple ratchet grooves in sequence, and the limiting groove moves relative to the limiting column. When the limiting column abuts against the lower end of the limiting groove, the ratchet separates from the ratchet groove and snaps into the separation groove; the rotating arm rotates downward, which can drive the locking piece and the separation piece to rotate downward. When the limiting column abuts against the upper end of the limiting groove, the separation guide rod can abut against the locking piece to guide the locking piece to rotate, and the ratchet separates from the separation groove and snaps into the ratchet groove.

3. The handrail device according to claim 2, characterized in that: The ratchet is provided with a first guide bevel on one side facing the separator, and the separator is provided with a second guide bevel extending to the separation groove on one side facing the ratchet. When the first guide bevel abuts against the second guide bevel, the ratchet can slide into the separation groove along the second guide bevel.

4. The handrail device according to claim 1, characterized in that: An upper hook extending downward and forward is provided on the lower side of the second support arm, and a lower hook extending upward and backward is provided on the upper side of the first support arm. Both ends of the tension spring are respectively connected to the upper hook and the lower hook.

5. The handrail device according to claim 1, characterized in that: A plug-in block is provided at the lower end of the rotating support, a plug-in slot is provided at the upper end of the connecting seat, and the plug-in block is plugged into the plug-in slot.

6. The handrail device according to claim 1, characterized in that: The connecting seat can be rotatably connected to the connecting arm.

7. The handrail device according to claim 6, characterized in that: The lower end surface of the connecting seat is provided with a plurality of downwardly opening arc-shaped gear slots, and the upper end of the connecting arm is provided with a retractable gear column, the upper end of the gear column is hemispherical and is inserted into the gear slot.

8. The handrail device according to claim 1, characterized in that: The armrest pad is configured to be slidable relative to the armrest seat.

9. The handrail device according to claim 8, characterized in that: The armrest backrest is configured to be rotatable relative to the armrest seat.

10. A seat, characterized in that: The invention comprises an armrest device as claimed in any one of claims 1 to 9.

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