A detachable armrest component, and a chair comprising the same

Abstract

This application belongs to the field of furniture product technology, and particularly relates to a detachable armrest component and a chair including the component. The detachable armrest component includes a bottom screw-in plate, an outer fixing cylinder, an armrest plate, and an inner lifting cylinder. It also includes a limiting support plate unit disposed on the inner side of the inner lifting cylinder, a support spring disposed in the outer fixing cylinder and used to lift the limiting support plate unit, a slotted frame unit disposed on the inner side of the outer fixing cylinder, horizontally fixing the support spring and used for vertically inserting the limiting support plate unit, a mounting hole disposed on the inner lifting cylinder and located above the limiting support plate unit, and a plug-in frame unit.

Description

Technical Field

[0001] This application belongs to the field of furniture product technology, and in particular relates to a detachable armrest component and a chair including the component. Background Technology

[0002] Detachable armrests generally refer to armrests that are movably connected to the main body of the chair or sofa. When the armrest is damaged, this type of detachable connection provides a relatively simple function for disassembly and replacement.

[0003] Specifically, the above-mentioned active connection methods are generally screw connections and / or snap-fit ​​connections.

[0004] On the other hand, the convenient disassembly and replacement function of the handrail should not significantly affect other functions of the handrail, such as the lifting function, thus ensuring that the disassembly handrail has relatively comprehensive practicality and a certain degree of flexibility in use.

[0005] For example, the utility model patent with authorization announcement number CN 214284115 U and authorization announcement date of 2021.09.28 discloses a detachable handrail, whose main structural components include: a lower connector, an upper connector, a support arm, a reinforced base, a first mounting screw hole, a second mounting screw hole, a first reinforcing support, a hydraulic column, a telescopic rod, a second reinforcing support, Velcro, and a sponge pad.

[0006] The detachable handrail in this utility model patent has the following advantages and functions: the support arm can be raised or lowered according to the increase or decrease of the pressure, thereby improving the overall comfort of the handrail.

[0007] However, in actual use, this detachable handrail still has at least the following practical shortcomings, specifically including:

[0008] First, the height adjustment effect of its support arm can only be provided by a hydraulic structure composed of hydraulic column and telescopic rod. This results in the lifting effect being passive and singular. For example, it cannot provide a relatively high support arm height under relatively strong downward pressure. Therefore, the overall practicality of the handrail is relatively low.

[0009] Secondly, the internal disassembly of the handrail itself is relatively difficult. The lower and upper connectors are equipped with the aforementioned hydraulic structure. When one of the two connectors is damaged or needs to be replaced, it is usually disassembled at the location of the hydraulic structure. However, the handrail lacks a dedicated, convenient, and quick disassembly structure at this location, which ultimately makes it difficult to replace the lower and upper connectors separately, thus reducing the practicality of the handrail. Summary of the Invention

[0010] This application provides a detachable armrest component, the technical problem to be solved by which an armrest, for example, used on a chair, has at least the following two functions and advantages: First, both the armrest as a whole and its internal structure are easy to disassemble and replace; Second, the detachable function does not affect its full lifting function, ensuring the comprehensiveness and practicality of the armrest's lifting function.

[0011] In addition, this application also provides a chair with a structure including the aforementioned detachable armrest components.

[0012] The technical solution adopted by this application to solve the above problems is: a detachable handrail component, the structure of which includes a bottom screw hole plate, an outer fixed cylinder, a handrail plate, and an inner lifting cylinder, and further includes a limiting support dual-purpose plate unit disposed on the inner side of the inner lifting cylinder, a support spring disposed in the outer fixed cylinder and used to lift the limiting support dual-purpose plate unit, a grooved frame unit disposed on the inner side of the outer fixed cylinder and used to fix the support spring laterally and vertically insert the limiting support dual-purpose plate unit, a mounting hole disposed on the inner lifting cylinder and located above the limiting support dual-purpose plate unit, and a plug-in frame unit that is inserted into the mounting hole and engaged with the grooved frame unit, and is released from the engagement relationship with the grooved frame unit by lateral sliding, so as to trigger the elastic support effect of the support spring.

[0013] A further preferred technical solution is that the limiting support dual-purpose plate unit includes a transverse fixing plate disposed on the inner side of the inner lifting cylinder and used to press down the support spring, an inner insertion hole disposed on the transverse fixing plate and used to insert the slotted frame unit, and an outer cutout disposed on the side of the transverse fixing plate, communicating with the inner insertion hole and used to insert the slotted frame unit.

[0014] A further preferred technical solution is that: the slotted frame unit includes an outer vertical plate for limiting, which is disposed on the inner side of the outer fixed cylinder and abuts against the inner side of the inner lifting cylinder and is used to insert into the outer cut; an inner vertical plate for limiting, which is disposed on the outer vertical plate for limiting, has a fan-shaped cross-section and is used to fix the support spring laterally and insert it upward into the inner insertion hole; and a pair of limiting slots for lifting gears, which are disposed on the opposite sides of the outer vertical plate for limiting and the inner vertical plate for limiting and are used to insert the insertion frame unit laterally.

[0015] A further preferred technical solution is that the plug-in frame unit includes a plug-in adjusting rod inserted into the mounting hole, a support rod disposed on the plug-in adjusting rod and used to insert into the pair of limiting slots for the lifting gear, and a bidirectional limiting plate disposed on the plug-in adjusting rod, connected to the support rod, and blocked by the inner side of the inner lifting cylinder and the slotted frame unit to limit the maximum sliding range of the plug-in adjusting rod.

[0016] A further preferred technical solution is that: the grooved frame unit further includes a bottom connecting plate disposed on the inner side of the outer fixed cylinder and connected to the outer vertical plate for limiting; the lower end surface of the inner lifting cylinder is also provided with a limiting vertical groove for inserting the bottom connecting plate.

[0017] A further preferred technical solution is that the grooved frame unit also includes a bottom connecting block whose two ends are respectively connected to the outer vertical plate for limiting and the inner vertical plate for limiting.

[0018] A further preferred technical solution is that the grooved frame unit further includes an arc-shaped groove disposed on the upper surface of the bottom connecting block and used for installing the support spring.

[0019] A further preferred technical solution includes an auxiliary spring disposed on the arc-shaped groove and used together with the support spring to support the transverse fixing plate.

[0020] A further preferred technical solution is that the height of the pair of limiting grooves used for the lifting gear is higher than the height of the upper end surface of the outer fixed cylinder.

[0021] A chair, comprising a seat base plate and the aforementioned detachable armrest components, wherein the bottom screw-in plate is disposed on the seat base plate.

[0022] The beneficial effects of this application include at least the following six points.

[0023] First, in this detachable armrest component, the bottom screw-in plate is screwed to the main structure of the chair, the inner lifting cylinder and the outer fixed cylinder are sleeved together, and the grooved frame unit and the limiting support dual-purpose plate unit are inserted together, thus enabling the armrest component to have both convenient disassembly and assembly features and the circumferential limiting function of the armrest plate and the foundation.

[0024] Secondly, in this detachable handrail component, when the plug-in frame unit is plugged into the slotted frame unit, the handrail has a relatively fixed, stepped lifting adjustment function. When the plug-in relationship is canceled, the handrail has an elastic support type lifting adjustment function, thereby enabling the handrail component to have a comprehensive and practical handrail lifting function.

[0025] Third, in this detachable handrail component, the limiting and supporting dual-purpose plate unit has at least the following two functions:

[0026] A. It abuts against the upper end of the support spring to ensure the effectiveness of the elastic support type lifting and adjusting function;

[0027] B. Provide insertion positions for slotted frame units to improve the circumferential stability of the handrail.

[0028] Fourth, in this detachable handrail component, the slotted frame unit has at least the following five functions:

[0029] A. Simultaneously insert the limiting support dual-purpose plate unit and the limiting vertical slot to avoid unnecessary circumferential rotation and displacement of the handrail plate;

[0030] B. Provide an insertion position for the plug-in frame unit to indirectly support the handrail. Otherwise, the insertion position is usually provided by the outer fixed cylinder, which will destroy the integrity of the outer fixed cylinder. At the same time, the position height of the plug-in frame unit must be low, that is, the plug-in frame unit is easily seen and does not have the relatively high external structural integrity of the handrail that fully covers the plug-in frame unit in this application.

[0031] C. Lateral fixed support springs, even relatively thin support springs, are not prone to harmful lateral displacement within the outer fixed cylinder.

[0032] D. When the support spring is relatively thick, it can be set on the arc groove, which makes the grooved frame unit have a relatively wide range of support spring compatibility advantages.

[0033] E. An auxiliary spring can also be installed on the arc-shaped groove. Together with the support spring, it supports the limit support dual-purpose plate unit, providing a more flexible adjustable support strength effect for the elastic support type lifting and adjustment function.

[0034] Fifth, in this detachable handrail component, the plug-in frame unit shall have at least the following two functions:

[0035] A. Flexible switching between the active and idle states of the support spring;

[0036] B. Together with the vertical groove for limiting, it restricts the maximum descent of the handrail plate to prevent the support spring from being crushed. At this time, the plug-in frame unit abuts against the upper surface of the limiting support dual-purpose plate unit.

[0037] Sixth, in this chair, the bottom screw hole plate can be set on the upper or lower surface of the seat base plate to ensure sufficient connection stability and necessary ease of disassembly and assembly. Attached Figure Description

[0038] Figure 1This is a structural schematic diagram of the detachable handrail component in this application.

[0039] Figure 2 This is a schematic diagram showing the position of the support spring in this application.

[0040] Figure 3 This is a schematic diagram of the location and structure of the slotted frame unit in this application.

[0041] Figure 4 This is a schematic diagram of the position and structure of the dual-purpose plate unit for limiting support in this application.

[0042] Figure 5 This is a schematic diagram of the plug-in frame unit in this application.

[0043] Figure 6 This is a schematic diagram showing the position and shape of the paired limit grooves used for the gear shifting in this application.

[0044] Figure 7 This is a top-down view showing the position where the plug-in frame unit no longer plugs into the slotted frame unit when the support spring is triggered.

[0045] Figure 8 This is a schematic diagram showing the position of the auxiliary spring in this application.

[0046] Figure 9 This is a schematic diagram showing the position and shape of the inner insertion hole in this application.

[0047] Figure 10 This is a schematic diagram of the shape of a seat base plate in the prior art.

[0048] The meanings of the markings in the diagram are as follows.

[0049] Bottom screw hole plate 11, outer fixed cylinder 12, handrail plate 13, inner lifting cylinder 14;

[0050] Limiting and supporting dual-purpose plate unit 1, support spring 2, slotted frame unit 3, mounting hole 4, plug-in frame unit 5, limiting vertical slot 6, auxiliary spring 7;

[0051] Horizontal fixing plate 101, inner insertion hole 102, outer cutout 103;

[0052] The outer vertical plate 301 for limiting, the inner vertical plate 302 for limiting, the paired limiting grooves 303 for lifting gears, the bottom connecting plate 304, the bottom connecting block 305, and the arc groove 306 are included.

[0053] Plug-in adjustment rod 501, support rod 502, two-way limiting plate 503;

[0054] Seat base plate a, bolt groove a-1. Detailed Implementation

[0055] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0056] As attached Figure 1 -Appendix Figure 10 As shown, a detachable handrail component includes a bottom screw hole plate 11, an outer fixed cylinder 12, a handrail plate 13, and an inner lifting cylinder 14. It also includes a limiting support dual-purpose plate unit 1 disposed on the inner side of the inner lifting cylinder 14; a support spring 2 disposed inside the outer fixed cylinder 12 and used to lift the limiting support dual-purpose plate unit 1; a grooved frame unit 3 disposed on the inner side of the outer fixed cylinder 12, horizontally fixing the support spring 2 and used for vertically inserting into the limiting support dual-purpose plate unit 1; a mounting hole 4 disposed on the inner lifting cylinder 14 and located above the limiting support dual-purpose plate unit 1; and a pluggable frame unit 5 inserted into the mounting hole 4 and engaged with the grooved frame unit 3, which is released from engagement by horizontal sliding to trigger the elastic support function of the support spring 2.

[0057] In this embodiment, the specific structural composition of the detachable handrail component is, for example:

[0058] 1 bottom screw hole plate 11, 1 outer fixed cylinder 12, 1 handrail plate 13, 1 inner lifting cylinder 14, 1 limit support dual-purpose plate unit 1, 1 support spring 2, 2 slotted frame units 3, 2 mounting holes 4, and 1 plug-in frame unit 5.

[0059] The main body of this component is made of engineering plastic, while the plug-in frame unit 5 is made of steel. The bottom screw hole plate 11, the outer fixing cylinder 12, and the grooved frame unit 3 are integrally formed, as are the handrail plate 13, the inner lifting cylinder 14, and the limit support dual-purpose plate unit 1.

[0060] The lower end of the support spring 2 presses against the bottom screw hole plate 11, and the upper end supports the limiting support dual-purpose plate unit 1. Neither the upper nor lower end needs to be fixedly connected. The plug-in bracket unit 5, as one of the separate accessories of this component, is always plugged into the two mounting holes 4.

[0061] On the other hand, the principle by which this component triggers the fixed, stepped height adjustment function of the armrest 13 is:

[0062] First, it is acceptable whether the limiting support dual-purpose plate unit 1 has already pressed down the support spring 2;

[0063] Second, the slotted frame unit 3 has at least two sets of slot structures. The plug-in frame unit 5 can select one set to insert, thereby providing the handrail 13 with a fixed, stepped height adjustment function.

[0064] Furthermore, the principle by which this component triggers the elastic support type lifting adjustment function is:

[0065] First, the plug-in frame unit 5 is still plugged into the mounting hole 4, but it is not plugged into the "slot" structure of any of the above-mentioned slotted frame units 3;

[0066] Secondly, the limiting support dual-purpose plate unit 1 presses on the support spring 2. When the user presses down on the armrest plate 13 relatively significantly, its height can be lowered; conversely, the height of the armrest plate 13 can be actively raised.

[0067] Therefore, this detachable handrail component has the function and advantage of "the detachable function does not affect its full lifting function, ensuring the fullness and practicality of the handrail's lifting function".

[0068] Finally, the reason why this detachable handrail component has the function and advantage of "easy disassembly and replacement of both the handrail as a whole and its internal structure" is mainly because:

[0069] First, the bottom screw plate 11 and the seat base plate a are screwed together, making the entire armrest assembly easy to disassemble and replace;

[0070] Secondly, the bottom screw hole plate 11 and the outer fixed cylinder 12, as well as the handrail plate 13 and the inner lifting cylinder 14, are two relatively independent handrail components that are only plugged in. The latter can be separated from each other by manually lifting them without any need for unscrewing or unfastening the connection. They are separated only by friction, which makes it easy to replace these two relatively independent handrail components individually and reduces the long-term use cost of the handrail components.

[0071] The limiting support dual-purpose plate unit 1 includes a transverse fixing plate 101 disposed on the inner side of the inner lifting cylinder 14 and used to press down the support spring 2, an inner insertion hole 102 disposed on the transverse fixing plate 101 and used to insert the slotted frame unit 3, and an outer cutout 103 disposed on the side of the transverse fixing plate 101, communicating with the inner insertion hole 102 and used to insert the slotted frame unit 3.

[0072] In this embodiment, both the outer fixed cylinder 12 and the inner lifting cylinder 14 are cylindrical. The transverse fixed plate 101 is a circular plate, the inner insertion hole 102 is fan-shaped, and the outer cutout 103 is generally rectangular. For details, please refer to the attached diagram. Figure 9 .

[0073] At this point, the inner lifting cylinder 14 has acquired the circumferential limiting function, and the handrail 13 is less likely to undergo harmful circumferential rotation.

[0074] Furthermore, the inner insertion holes 102 and the outer cutouts 103 are arranged in pairs, with a total of two pairs. The positional relationship of the two inner insertion holes 102 is such that they are centrally symmetrical about the center of the transverse fixing plate 101.

[0075] The slotted frame unit 3 includes an outer vertical plate 301 for limiting, which is disposed on the inner side of the outer fixed cylinder 12 and abuts against the inner side of the inner lifting cylinder 14 and is used to insert into the outer cutout 103; an inner vertical plate 302 for limiting, which is disposed on the outer vertical plate 301 and has a fan-shaped cross-section and is used to fix the support spring 2 laterally and insert upward into the inner insertion hole 102; and a pair of limiting slots 303 for lifting gears, which are disposed on the opposite sides of the outer vertical plate 301 and the inner vertical plate 302 and are used to insert laterally into the insertion frame unit 5.

[0076] In this embodiment, the outer vertical plate 301 for limiting is located radially outward in the radial direction of the outer fixed cylinder 12, corresponding to the word "outer". Correspondingly, the inner vertical plate 302 for limiting is located radially inward.

[0077] On the other hand, there are two outer vertical plates 301 and two inner vertical plates 302 for limiting. Therefore, regardless of which set of paired limiting slots 303 for lifting gears the insert frame unit 5 is inserted into, the latter can provide four engagement positions for the former, further improving the stability of the slotted frame unit 3 indirectly supporting the handrail plate 13. For details, please refer to the appendix. Figure 6 .

[0078] Specifically, the lifting gear on the inner vertical plate 302 of the limiting device uses a pair of limiting grooves 303, the latter having a relatively small radial opening depth, which should not penetrate the inner vertical plate 302 of the limiting device.

[0079] The plug-in / plug-out frame unit 5 includes a plug-in / plug-out adjusting rod 501 inserted into the mounting hole 4, a support rod 502 disposed on the plug-in / plug-out adjusting rod 501 and used to insert into the pair of limiting slots 303 for the lifting gear, and a bidirectional limiting plate 503 disposed on the plug-in / plug-out adjusting rod 501 and connected to the support rod 502, which is blocked by the inner side of the inner lifting cylinder 14 and the slotted frame unit 3 to limit the maximum sliding range of the plug-in / plug-out adjusting rod 501.

[0080] In this embodiment, there is one of each of the plug-in adjustment rod 501 and the bidirectional limiting plate 503, and there are two of the support rods 502.

[0081] Specifically, the mounting hole 4 is a square opening, and the vertical cross-sectional shape of the plug-in adjustment rod 501 is square, thereby preventing unnecessary rotation of the plug-in bracket unit 5.

[0082] On the other hand, the plug-in bracket unit 5 is used as follows:

[0083] First, when the component has triggered the lifting and adjusting function of the fixed position, the bidirectional limiting plate 503 abuts against the outer vertical plate 301 and / or the inner vertical plate 302 for limiting, and the support rod 502 is inserted into one of the pairs of lifting gear limiting slots 303.

[0084] Second, when the component has already triggered or needs to trigger the effective support spring 2, the bidirectional limiting plate 503 abuts against the inner side of the inner lifting cylinder 14, and the support rod 502 is not inserted into any set of lifting gears by the paired limiting grooves 303.

[0085] Third, when the component is triggering the lifting and lowering adjustment function of the fixed position, the end of the plug-in adjustment rod 501 near the bidirectional limiting plate 503 continuously applies inward pressure, and the handrail 13 actively attempts to lift and lower vertically until the support rod 502 "finds" one of the pairs of limiting slots 303 for lifting and lowering positions and completes the insertion action. The end point of the insertion action is that the bidirectional limiting plate 503 abuts against the outer vertical plate 301 and / or the inner vertical plate 302 for limiting.

[0086] Therefore, both ends of the insertion / removal adjustment rod 501 are always inserted into the two mounting holes 4 respectively. During the entire use of the insertion / removal frame unit 5, only the end of the insertion / removal adjustment rod 501 near the bidirectional limiting plate 503 undergoes a sliding operation of relative retraction and relative protrusion.

[0087] The slotted frame unit 3 also includes a bottom connecting plate 304 disposed on the inner side of the outer fixed cylinder 12 and connected to the outer vertical plate 301 for limiting; the lower end surface of the inner lifting cylinder 14 is also provided with a limiting vertical groove 6 for inserting the bottom connecting plate 304.

[0088] In this embodiment, the inner lifting cylinder 14 can obtain at least the following three circumferential fixing points:

[0089] First, the inner vertical plate 302 for limiting is inserted into the inner insertion hole 102;

[0090] Second, the limiting device uses an outer vertical plate 301 to insert into an outer cutout 103;

[0091] Third, the bottom connecting plate 304 is inserted into the vertical groove 6 for limiting positioning.

[0092] At this point, the inner lifting cylinder 14 has a sufficiently stable circumferential fixing effect.

[0093] On the other hand, another function of the vertical groove 6 used for limiting is:

[0094] When its upper end face abuts against the bottom connecting plate 304, the plug-in frame unit 5 is configured to simultaneously abut against the upper surface of the transverse fixing plate 101 and the lower end face of the inner lifting cylinder 14 simultaneously abut against the upper surface of the bottom screw hole plate 11, thereby improving the stability of the lowest point position of the inner lifting cylinder 14.

[0095] At this time, the compression of the support spring 2 by the horizontal fixing plate 101 is at its maximum value. This maximum value is set to be less than the maximum safe compression of the support spring 2, thereby directly protecting the support spring 2 and indirectly protecting the entire handrail component.

[0096] The slotted frame unit 3 also includes a bottom connecting block 305 that connects the outer vertical plate 301 and the inner vertical plate 302 for limiting respectively at both ends.

[0097] In this embodiment, the bottom connecting block 305 is a cuboid block. Its lower end face, like the lower end face of the outer vertical plate 301 for limiting, the lower end face of the inner vertical plate 302 for limiting, and the lower end face of the bottom connecting plate 304, all abut against the bottom screw hole plate 11, thereby reducing the pressure at the connection between the bottom connecting plate 304 and the outer fixed cylinder 12.

[0098] The slotted frame unit 3 also includes an arc-shaped groove 306 disposed on the upper surface of the bottom connecting block 305 and used to install the support spring 2.

[0099] In this embodiment, one of the functions of the inner vertical plate 302 for limiting is:

[0100] Even a support spring 2 with a relatively small main body diameter can be stably installed inside the outer fixed cylinder 12 without easily moving laterally. Otherwise, the support spring 2 is prone to twisting, and the elastic support function is unstable.

[0101] Accordingly, the main function of the arc-shaped groove 306 is:

[0102] The support spring 2, whose main body diameter is smaller than the inner diameter of the outer fixed cylinder 12 but larger than the outer diameter of the inner vertical plate 302 for limiting, can also be stably installed and used efficiently.

[0103] Thus, the grooved frame unit 3 can accommodate support springs 2 of varying thicknesses and main body diameters, greatly enhancing its practicality and the overall usability of the handrail assembly. Note that the main body diameter refers to the diameter of the spring component, not its wire diameter.

[0104] The structure of the detachable handrail component also includes an auxiliary spring 7 disposed on the arc-shaped groove 306 and used together with the support spring 2 to support the transverse fixing plate 101.

[0105] In this embodiment, the auxiliary spring 7 can replace the support spring 2, or the two can be used in combination to further enhance the comprehensiveness and flexibility of the elastic support lifting function of the handrail component.

[0106] Furthermore, even specifically regarding the support spring 2, since the upper surface of the bottom connecting block 305 is higher than the upper surface of the bottom screw hole plate 11, when the user feels a significant decrease in the elasticity of the support spring 2, the missing elasticity can be compensated by replacing it with one mounted on the arc-shaped groove 306.

[0107] Of course, the above replacement and compensation methods require that the support spring 2 be a variable diameter spring, whose main body diameter can be appropriately enlarged or reduced.

[0108] The height of the pair of limiting grooves 303 used for the lifting gear is higher than the height of the upper end face of the outer fixed cylinder 12.

[0109] In this embodiment, the relatively high height of the paired limiting grooves 303 used for the gear shifting has the following two main advantages:

[0110] First, the plug-in frame unit 5 is not only mounted on the inner lifting cylinder 14, but also positioned relatively high on it, allowing the handrail plate 13 to appropriately cover the plug-in frame unit 5, ultimately improving the overall appearance of the entire handrail component. For details, please refer to the appendix. Figure 1 ;

[0111] Secondly, it is not required to open a hole on the outer fixing cylinder 12 for inserting the support rod 502, which also improves the overall appearance of the outer fixing cylinder 12.

[0112] A chair has a structure including a seat base plate a and a detachable armrest component, wherein the bottom screw hole plate 11 is disposed on the seat base plate a.

[0113] In this embodiment, the upper or lower surface of the seat base plate a is provided with a bolt groove a-1, or bolt holes are directly provided thereon, which can stably install the detachable handrail component.

[0114] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this application. These are non-inventive modifications and are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A detachable handrail component, comprising a bottom screw-in plate (11), an outer fixing cylinder (12), a handrail plate (13), and an inner lifting cylinder (14), characterized in that: It also includes a limiting support plate unit (1) disposed on the inner side of the inner lifting cylinder (14), a support spring (2) disposed in the outer fixed cylinder (12) and used to lift the limiting support plate unit (1), a slotted frame unit (3) disposed on the inner side of the outer fixed cylinder (12), which fixes the support spring (2) laterally and is used to vertically insert the limiting support plate unit (1), a mounting hole (4) disposed on the inner lifting cylinder (14) and located above the limiting support plate unit (1), and a plug-in frame unit (5) which is inserted into the mounting hole (4), engages with the slotted frame unit (3), and releases the engagement relationship with the slotted frame unit (3) by sliding laterally, so as to trigger the elastic support effect of the support spring (2).

2. A detachable handrail component according to claim 1, characterized in that: The limiting support dual-purpose plate unit (1) includes a transverse fixing plate (101) disposed on the inner side of the inner lifting cylinder (14) and used to press down the support spring (2), an inner insertion hole (102) disposed on the transverse fixing plate (101) and used to insert the slotted frame unit (3), and an outer cutout (103) disposed on the side of the transverse fixing plate (101), communicating with the inner insertion hole (102), and used to insert the slotted frame unit (3).

3. A detachable handrail component according to claim 2, characterized in that: The slotted frame unit (3) includes a limiting outer vertical plate (301) disposed on the inner side of the outer fixed cylinder (12) and abutting the inner side of the inner lifting cylinder (14) and used for inserting the outer cutout (103); a limiting inner vertical plate (302) disposed on the limiting outer vertical plate (301) and having a fan-shaped cross-section, used for laterally fixing the support spring (2) and inserting upward into the inner insertion hole (102); and a pair of limiting slots (303) disposed on the opposite sides of the limiting outer vertical plate (301) and the limiting inner vertical plate (302) and used for laterally inserting the insertion frame unit (5).

4. A detachable handrail component according to claim 3, characterized in that: The plug-in frame unit (5) includes a plug-in adjusting rod (501) inserted into the mounting hole (4), a support rod (502) disposed on the plug-in adjusting rod (501) and used to insert into the pair of limiting slots (303) for the lifting gear, and a bidirectional limiting plate (503) disposed on the plug-in adjusting rod (501) and connected to the support rod (502), and used to limit the maximum sliding range of the plug-in adjusting rod (501) by being blocked by the inner side of the inner lifting cylinder (14) and the slotted frame unit (3).

5. A detachable handrail component according to claim 3, characterized in that: The slotted frame unit (3) also includes a bottom connecting plate (304) disposed on the inner side of the outer fixed cylinder (12) and connected to the outer vertical plate (301) for limiting; the lower end surface of the inner lifting cylinder (14) is also provided with a limiting vertical groove (6) for inserting the bottom connecting plate (304).

6. A detachable handrail component according to claim 3, characterized in that: The slotted frame unit (3) also includes a bottom connecting block (305) that connects the outer vertical plate (301) for limiting and the inner vertical plate (302) for limiting respectively at both ends.

7. A detachable handrail component according to claim 6, characterized in that: The slotted frame unit (3) also includes an arc-shaped groove (306) disposed on the upper surface of the bottom connecting block (305) and used to install the support spring (2).

8. A detachable handrail component according to claim 7, characterized in that: It also includes an auxiliary spring (7) disposed on the arc groove (306) and used together with the support spring (2) to support the transverse fixing plate (101).

9. A detachable handrail component according to claim 3, characterized in that: The height of the pair of limiting grooves (303) used for the lifting gear is higher than the height of the upper end face of the outer fixed cylinder (12).

10. A chair, comprising a seat base plate (a), characterized in that: It also includes a detachable armrest component as described in any one of claims 1-9, wherein the bottom screw hole plate (11) is disposed on the seat base plate (a).

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