Wearable seat

Abstract

The utility model provides a wearable seat, including an upper bracket and a lower bracket, a multi-stage telescopic adjustment and rotatable connection structure is provided between the upper bracket and the lower bracket, the connection structure includes an upper connection component and a lower connection component, the upper connection component includes an upper fixing part and an upper rotating part rotatably connected to the upper fixing part, the lower connection component includes a lower fixing part and a lower rotating part rotatably connected to the lower fixing part, and the upper rotating part is slidably connected to the lower rotating part. The multi-stage telescopic adjustment and rotatable connection structure can be adjusted in height to adapt to different comfortable support heights for the human body; after the user wears it, no other actions are required to realize the free conversion of two different postures of support and walking, and normal walking is not affected; it greatly reduces the occurrence of occupational diseases such as musculoskeletal diseases (MSDS) caused by long-term bending of the knees or standing work, and has important significance in innovating furniture types, improving people's livelihood and reducing enterprise costs.

Description

Technical Field

[0001] The utility model relates to a wearable seat. Background Art

[0002] At present, some special types of work require bending the knees or standing for a long time, and need to move from time to time to pick up objects. Traditional seats cannot meet the needs of different posture changes. At the same time, due to long-term bending the knees or standing to work, it is very easy to suffer from occupational diseases such as musculoskeletal disorders (MSDS), which not only seriously affects the health of workers, but also reduces the labor efficiency of workers and increases the cost of enterprises. Most of the existing wearable seats use electric control or manual control of electricity to achieve the purpose of posture conversion. On the one hand, the product endurance is poor and the maintenance cost is high; on the other hand, the hands of workers in special jobs are often contaminated with other dust or liquids when working, which can easily dirty the seats.

[0003] Therefore, further improvement is needed. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a wearable seat to overcome the shortcomings of the prior art. The wearable seat does not require electrical support and can freely switch between supporting and free walking postures.

[0005] A wearable seat designed for this purpose comprises an upper bracket and a lower bracket, a multi-stage telescopic adjustment and rotatable connection structure is provided between the upper bracket and the lower bracket, the connection structure comprises an upper connection component and a lower connection component, the upper connection component comprises an upper fixed part and an upper rotating part rotatably connected to the upper fixed part, the lower connection component comprises a lower fixed part and a lower rotating part rotatably connected to the lower fixed part, the upper rotating part is slidably connected to the lower rotating part, when the user walks, the upper bracket drives the upper fixed part to move, the upper rotating part can rotate relative to the upper fixed part, the lower bracket drives the lower rotating part to slide up and down on the upper rotating part, and the lower rotating part rotates relative to the lower fixed part.

[0006] The upper fixing member is provided with a first rotating part, and the upper rotating member is provided with a first sliding groove matched with the first rotating part, and the first rotating part can rotate in the first sliding groove.

[0007] The upper fixing member is provided with a limiting portion, and when the user sits down, the semi-arc end of the upper rotating member abuts against the side wall of the limiting portion.

[0008] The lower rotating member is provided with a sliding block, and the sliding block cooperates with the first sliding groove to enable the lower rotating member to slide up and down relative to the upper rotating member.

[0009] The lower rotating member is provided with a second rotating part, and the lower fixed member is provided with a second sliding groove matched with the second rotating part. The second rotating part can be rotated on the second sliding groove. When the user sits down, one end of the sliding block abuts against the side wall of the lower fixed member.

[0010] The wearable seat also includes a stopper, and the upper rotating member is provided with a plurality of through holes evenly spaced apart. The stopper is mounted on the upper rotating member and cooperates with the through holes, and the stopper can limit the sliding distance of the lower rotating member on the upper rotating member.

[0011] The wearable seat also includes a support plate hinged to the lower bracket, a hinge structure is provided between the support plate and the lower bracket, the hinge structure includes a fixed seat and a rotating shaft, the rotating shaft is arranged on the lower bracket, the fixed seat is provided with an opening that cooperates with the rotating shaft, the lower bracket is connected to the opening on the fixed seat through the rotating shaft, so that the lower bracket can rotate relative to the support plate.

[0012] The upper bracket and the lower bracket are both provided with Velcro; the shape of the upper end of the upper bracket conforms to the shape of the buttocks of the human body.

[0013] The upper fixing member and the upper bracket, and the lower fixing member and the lower bracket are respectively fastened and connected by screws; the lower bracket is provided with a plurality of mounting holes, and the lower fixing member is adjustably mounted on the mounting holes by screws to achieve adjustable height size of the lower fixing member.

[0014] The wearable seat also includes a support plate, a support rod is provided between the lower bracket and the support plate, the support rod is detachably installed between the lower bracket and the support plate, the lower bracket is provided with a fixing groove for fixing one end of the support rod, the support plate is provided with a positioning structure for fixing the other end of the support rod, the positioning structure includes a groove, a plurality of positioning bosses are provided on the groove, a positioning groove for positioning the support rod is formed between two of the positioning bosses, a positioning surface and a first guide surface are provided on one end of the support rod, and a second guide surface is provided on the positioning boss. When the user sits down, the lower bracket rotates, and the first guide surface and the second guide surface are slidably matched, so that the positioning surface is located on the positioning groove.

[0015] Compared with the prior art, the wearable seat of the above embodiment has the following advantages:

[0016] Mechanical transmission and support are used to solve the problems of poor battery life and easy dirtiness of general wearable seat products;

[0017] Multi-level telescopic adjustment and rotatable connection structure design to meet the requirements of different leg and body sizes;

[0018] The rational design of the upper bracket, lower bracket and connecting structure can meet the requirements of free conversion between support and free walking postures.

[0019] Through the reasonable design of wearable seats, the occurrence of occupational diseases such as musculoskeletal disorders (MSDS) caused by long-term bending or standing work can be greatly reduced, which is of great significance to the innovation of furniture types and the improvement of people's livelihood.

[0020] A hinge structure is provided between the support sheet and the lower bracket. The hinge structure ensures that the support sheet provides stable support through the cooperation of the fixed seat and the rotating shaft, thereby preventing the seat from becoming unstable due to the shift of the center of gravity.

[0021] A support rod is provided between the lower bracket and the support sheet, and a positioning structure for fixing the other end of the support rod is provided on the support sheet, thereby fixing the support rod and preventing the support rod from sliding or shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic diagram of the overall structure of a wearable seat in one embodiment of the utility model.

[0025] Figure 2 This is a schematic diagram of the overall structure of a wearable seat in another direction in one embodiment of the utility model.

[0026] Figure 3 It is a schematic diagram of the connection structure in one embodiment of the utility model.

[0027] Figure 4 It is a schematic diagram of the structure of the upper fixing member in one embodiment of the utility model.

[0028] Figure 5 It is a schematic diagram of the structure of the upper rotating member in one embodiment of the utility model.

[0029] Figure 6 It is a schematic diagram of the structure of the lower rotating member in one embodiment of the utility model.

[0030] Figure 7It is a schematic diagram of the structure of the lower fixing member in one embodiment of the utility model.

[0031] Figure 8 This is an assembly diagram of the overall structure of a wearable seat in one embodiment of the utility model.

[0032] Fig. 9 This is an exploded view of the overall structure of a wearable seat in one embodiment of the present invention.

[0033] Fig.10 It is a schematic diagram of the hinge structure in one embodiment of the utility model.

[0034] Fig.11 It is a schematic diagram of the structure of the lower bracket, the support sheet and the support rod in one embodiment of the utility model.

[0035] Fig.12 It is a schematic diagram of the support sheet structure in one embodiment of the utility model. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0037] like Figure 1 , Figure 2 and Figure 8 As shown, a wearable seat is provided, including an upper bracket 1 and a lower bracket 2, a multi-stage telescopic adjustment and rotatable connection structure is provided between the upper bracket 1 and the lower bracket 2, the connection structure includes an upper connection component 3 and a lower connection component 4, the upper connection component 3 includes an upper fixed part 301 and an upper rotating part 302 rotatably connected to the upper fixed part 301, the lower connection component 4 includes a lower fixed part 401 and a lower rotating part 402 rotatably connected to the lower fixed part 401, the upper rotating part 302 is slidably connected to the lower rotating part 402, when the user walks, the upper bracket 1 drives the upper fixed part 301 to move, the upper rotating part 302 can rotate relative to the upper fixed part 301, the lower bracket 2 drives the lower rotating part 402 to slide up and down on the upper rotating part 302, and the lower rotating part 402 rotates relative to the lower fixed part 401.

[0038] Specifically, when the user wears the seat and walks, there is no need to install the support rod 9. The upper bracket 1 drives the upper fixing part 301 to move, and the lower bracket 2 drives the lower fixing part 401 to move up and down. Driven by the upper fixing part 301 and the lower fixing part 401, the upper rotating part 302 and the lower rotating part 402 move up and down and rotate at the same time, and the lower rotating part 402 can slide up and down relative to the upper rotating part 302 to prevent obstruction to the user's normal walking; the multi-stage telescopic adjustment structure between the upper rotating part 302 and the lower rotating part 402 allows the seat to adapt to different heights and posture requirements.

[0039] Further, if Figure 3-Figure 5 and Fig. 9 As shown, the upper fixing member 301 is provided with a first rotating portion 3011 , and the upper rotating member 302 is provided with a first sliding groove 3021 that matches the first rotating portion 3011 . The first rotating portion 3011 can rotate in the first sliding groove 3021 .

[0040] Specifically, the design of the first rotating portion 3011 and the first sliding groove 3021 allows the upper rotating member 302 to rotate relative to the upper fixed member 301, thereby providing great flexibility and adaptability when the user walks.

[0041] Further, if Figure 3-Figure 9 As shown, a limiting portion 3012 is provided on the upper fixing member 301 . When the user sits down, the semi-arc end of the upper rotating member 302 abuts against the side wall of the limiting portion 3012 .

[0042] Specifically, when the user sits down, the semi-arc end of the upper rotating member 302 abuts against the side wall of the limiting portion 3012 on the upper fixed member 301, which limits the further rotation of the upper rotating member 302, thereby fixing the position of the user when the user sits down and providing stable support;

[0043] When the user walks, the upper bracket 1 drives the upper fixing member 301 to move, the first rotating part 3011 slides in the first sliding groove 3021, and the upper rotating member 302 can rotate freely relative to the upper fixing member 301; the limiting part 3012 does not affect the movement of the upper rotating member 302 at this time, so that the user can walk freely without restriction.

[0044] Further, if Figure 3 , Figure 5 , Figure 6 and Fig. 9 As shown, a slider 4021 is provided on the lower rotating member 402 , and the slider 4021 cooperates with the first sliding groove 3021 to enable the lower rotating member 402 to slide up and down relative to the upper rotating member 302 .

[0045] Specifically, the design of the slider 4021 sliding in the first slide groove 3021 allows the lower rotating member 402 to be adjusted in height, so that the seat can be adjusted according to the height and posture requirements of different users. This adjustment capability enhances the applicability of the product and can meet the usage requirements in different scenarios; when the user walks and sits, the free sliding and fixing functions of the slider 4021 in the first slide groove 3021 provide stable and reliable support.

[0046] Further, if Figure 6-Figure 9 As shown, the lower rotating member 402 is provided with a second rotating part 4022, and the lower fixed member 401 is provided with a second slide groove 4011 that cooperates with the second rotating part 4022. The second rotating part 4022 can rotate on the second slide groove 4011. When the user sits down, one end of the slider 4021 abuts against the side wall of the lower fixed member 401.

[0047] Specifically, when the user sits down, one end of the slider 4021 abuts against the side wall of the lower fixing member 401, limiting the further sliding of the lower rotating member 402 and ensuring that it is fixed in a specific position.

[0048] Further, if Figure 2 and Figure 3 As shown, the wearable seat also includes a stopper 5, and a plurality of evenly spaced through holes 3022 are provided on the upper rotating member 302. The stopper 5 is installed on the upper rotating member 302 and cooperates with the through holes 3022. The stopper 5 can limit the sliding distance of the lower rotating member 402 on the upper rotating member 302.

[0049] Specifically, when the user sits down, the stopper 5 limits the sliding of the lower rotating member 402, ensuring that it is fixed in a predetermined position, thereby improving the stability of the seat; the stopper 5 can be inserted into different through holes 3022 as needed to adjust the sliding range of the lower rotating member 402, thereby improving the flexibility and adaptability of the seat.

[0050] Further, if Fig. 9 and Fig.10 As shown, the wearable seat also includes a support plate 6 hinged to the lower bracket 2, a hinge structure 8 is provided between the support plate 6 and the lower bracket 2, the hinge structure 8 includes a fixed seat 801 and a rotating shaft 802, the rotating shaft 802 is arranged on the lower bracket 2, and an opening 8011 matching with the rotating shaft 802 is provided on the fixed seat 801, and the lower bracket 2 is connected with the opening 8011 on the fixed seat 801 through the rotating shaft 802 to realize that the lower bracket 2 can rotate relative to the support plate 6.

[0051] Specifically, when the user is walking, the hinged structure 8 allows the lower bracket 2 to rotate freely relative to the support plate 6, providing a certain flexibility, ensuring that the user will not be restricted by the support plate 6 when walking, and ensuring natural and comfortable walking; when the user sits down, the hinged structure 8 ensures that the support plate 6 provides stable support, and at the same time allows the lower bracket 2 to rotate within a certain range to adapt to different sitting posture requirements. The hinged structure 8 ensures that the support plate 6 provides stable support through the cooperation of the fixed seat 801 and the rotating shaft 802, preventing the seat from being unstable due to the shift of the center of gravity.

[0052] Further, if Figure 1 and Figure 2 As shown, both the upper support 1 and the lower support 2 are provided with Velcro 7; the shape of the upper end of the upper support 1 conforms to the shape of the buttocks of the human body.

[0053] Specifically, the Velcro 7 is used to quickly fix the product to the user's thighs and calves, and makes it very convenient to put on and take off the seat. The user can quickly adjust the tightness of the seat as needed to adapt to different activities and posture requirements; the shape of the upper end of the bracket 1 conforms to the shape of the human buttocks to increase the user's comfort during use.

[0054] Further, if Figure 1-Figure 3 As shown, the upper fixing member 301 and the upper bracket 1, and the lower fixing member 401 and the lower bracket 2 are fastened together by screws respectively; a plurality of mounting holes 201 are provided on the lower bracket 2, and the lower fixing member 401 is adjustably mounted on the mounting holes 201 by screws to achieve an adjustable height dimension of the lower fixing member 401.

[0055] Specifically, the upper fixing member 301 and the upper bracket 1, and the lower fixing member 401 and the lower bracket 2 are respectively fastened together by screws. By tightening and loosening the screws, the structure is relatively simple and easy to install and disassemble; a plurality of mounting holes 201 are provided on the lower bracket 2. By selecting different mounting holes 201, the distance between the upper bracket 1 can be adjusted to adapt to different leg and body sizes.

[0056] Further, if Fig. 9 , Fig.11 and Fig.12As shown, the wearable seat also includes a support plate 6, a support rod 9 is provided between the lower bracket 2 and the support plate 6, the support rod 9 is detachably installed between the lower bracket 2 and the support plate 6, the lower bracket 2 is provided with a fixing groove 202 for fixing one end of the support rod 9, the support plate 6 is provided with a positioning structure for fixing the other end of the support rod 9, the positioning structure includes a slot 601, a plurality of positioning bosses 602 are provided on the slot 601, a positioning groove 603 for positioning the support rod 9 is formed between the two positioning bosses 602, a positioning surface 901 and a first guide surface 902 are provided on one end of the support rod 9, a second guide surface 6021 is provided on the positioning boss 602, when the user sits down, the lower bracket 2 rotates, the first guide surface 902 and the second guide surface 6021 slide together, so that the positioning surface 901 is located on the positioning groove 603.

[0057] Specifically, one end of the support rod 9 is inserted into the fixing groove 202 on the lower bracket 2 to achieve preliminary fixation; the other end of the support rod 9 cooperates with the slot 601 and the positioning boss 602 in the positioning structure through the positioning surface 901 and the first guide surface 902; when the support rod 9 is inserted into the slot 601, the first guide surface 902 and the second guide surface 6021 slide together to ensure that the support rod 9 is correctly positioned in the positioning groove 603; when the user sits down, the lower bracket 2 drives the support rod 9 to rotate, and the support rod 9 slides with the second guide surface 6021 on the positioning boss 602 through the first guide surface 902 to ensure that the positioning surface 901 accurately enters the positioning groove 603, thereby achieving fixation of the support rod 9 and preventing the support rod 9 from sliding or shifting.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0063] It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" may mean within one or more standard deviations, which are not limited here.

[0064] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A wearable seat, comprising an upper support (1) and a lower support (2), characterized in that: A multi-stage telescopically adjustable and rotatable connection structure is provided between the upper bracket (1) and the lower bracket (2), the connection structure comprising an upper connection assembly (3) and a lower connection assembly (4), the upper connection assembly (3) comprising an upper fixed member (301) and an upper rotating member (302) rotatably connected to the upper fixed member (301), the lower connection assembly (4) comprising a lower fixed member (401) and a lower rotating member (402) rotatably connected to the lower fixed member (401), the upper rotating member (302) and the lower rotating member (402) being slidably connected, when a user walks, the upper bracket (1) drives the upper fixed member (301) to move, the upper rotating member (302) can rotate relative to the upper fixed member (301), the lower bracket (2) drives the lower rotating member (402) to slide up and down on the upper rotating member (302), and the lower rotating member (402) rotates relative to the lower fixed member (401).

2. The wearable seat according to claim 1, characterized in that: The upper fixing member (301) is provided with a first rotating part (3011), and the upper rotating member (302) is provided with a first sliding groove (3021) matched with the first rotating part (3011), and the first rotating part (3011) can rotate in the first sliding groove (3021).

3. The wearable seat according to claim 1, characterized in that: The upper fixing member (301) is provided with a limiting portion (3012), and when a user sits down, the semi-arc-shaped end of the upper rotating member (302) abuts against the side wall of the limiting portion (3012).

4. The wearable seat according to claim 2, characterized in that: The lower rotating member (402) is provided with a sliding block (4021), and the sliding block (4021) cooperates with the first sliding groove (3021) to enable the lower rotating member (402) to slide up and down relative to the upper rotating member (302).

5. The wearable seat according to claim 4, characterized in that: The lower rotating member (402) is provided with a second rotating portion (4022), and the lower fixed member (401) is provided with a second sliding groove (4011) that cooperates with the second rotating portion (4022). The second rotating portion (4022) can be rotated on the second sliding groove (4011), and when the user sits down, one end of the sliding block (4021) abuts against the side wall of the lower fixed member (401).

6. The wearable seat according to claim 1, characterized in that: The wearable seat further comprises a stopper (5), the upper rotating member (302) being provided with a plurality of through holes (3022) evenly spaced apart, the stopper (5) being mounted on the upper rotating member (302) and cooperating with the through holes (3022), and the stopper (5) being capable of limiting the sliding distance of the lower rotating member (402) on the upper rotating member (302).

7. The wearable seat according to claim 1, characterized in that: The wearable seat further comprises a support plate (6) hinged to the lower bracket (2); a hinge structure (8) is provided between the support plate (6) and the lower bracket (2); the hinge structure (8) comprises a fixed seat (801) and a rotating shaft (802); the rotating shaft (802) is arranged on the lower bracket (2); an opening (8011) is provided on the fixed seat (801) and matches the rotating shaft (802); the lower bracket (2) is connected to the opening (8011) on the fixed seat (801) via the rotating shaft (802) so as to enable the lower bracket (2) to rotate relative to the support plate (6).

8. The wearable seat according to claim 1, characterized in that: The upper bracket (1) and the lower bracket (2) are both provided with Velcro (7); the shape of the upper end of the upper bracket (1) conforms to the shape of the buttocks of a human body.

9. The wearable seat according to claim 1, characterized in that: The upper fixing member (301) and the upper bracket (1), and the lower fixing member (401) and the lower bracket (2) are respectively fastened and connected by screws; the lower bracket (2) is provided with a plurality of mounting holes (201), and the lower fixing member (401) is adjustably mounted on the mounting holes (201) by means of screws, so that the height dimension of the lower fixing member (401) can be adjusted.

10. The wearable seat according to claim 1, characterized in that: The wearable seat further comprises a support sheet (6), a support rod (9) is provided between the lower support (2) and the support sheet (6), the support rod (9) is detachably mounted between the lower support (2) and the support sheet (6), the lower support (2) is provided with a fixing groove (202) for fixing one end of the support rod (9), the support sheet (6) is provided with a positioning structure for fixing the other end of the support rod (9), the positioning structure comprises a slot (601), and the slot (601) is provided with a plurality of positioning bosses (602), a positioning groove (603) for positioning the support rod (9) is formed between the two positioning bosses (602), a positioning surface (901) and a first guide surface (902) are provided on one end of the support rod (9), and a second guide surface (6021) is provided on the positioning boss (602). When the user sits down, the lower bracket (2) rotates, and the first guide surface (902) and the second guide surface (6021) are slidably matched, so that the positioning surface (901) is located on the positioning groove (603).

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