Chair seat
By adopting the design of the first toothed structure and tightening assembly in the chair seat, the problems of difficulty and high cost of assembly of existing adjustable armrest office chairs are solved, and the rapid assembly and adjustment of handrails are achieved, which is suitable for the DIY market.
Patent Information
- Application Number
- CN202410125142.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-29
- Filing Date
- 2024-01-30
- Publication Date
- 2025-05-30
AI Technical Summary
The existing adjustable armrest office chairs are more difficult to assemble and require more parts, which increases assembly difficulty and production costs, and are not suitable for launching in the furniture DIY market.
A chair seat is designed, adopting a structure including a first toothed structure and a tightening assembly. Each armrest consists of a cross bar, with a cross bar groove on the cross bar, and the seat base is equipped with a handrail slot and a mounting hole. The tightening device realizes the fixing and adjustment of the cross bar through the transmission assembly and the operating assembly.
It realizes rapid and convenient assembly and adjustment of handrails, reduces production and transportation costs, and is suitable for DIY market placement.
Smart Images
Figure CN120052672A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a seat, and particularly to a seat having a first toothed structure and a pressing assembly. Background Art
[0002] Currently, the requirements for the working environment and living environment are increasing day by day, and people's requirements for office chairs are also getting higher and higher. In addition to the flexibility, comfort and aesthetics of the chair, the chair is also required to have adjustable functions to adapt to different user heights, body types and usage methods. The design of the adjustable armrest office chair is precisely to meet these needs.
[0003] However, the disadvantages of this design method are also obvious. First of all, the assembly is relatively difficult, and it is very difficult for users without certain skills to complete it by themselves. Secondly, this design requires more parts, which not only increases the difficulty of assembly, but also increases the production cost. Finally, due to the relatively difficult assembly, it is not suitable for the furniture DIY market.
[0004] Therefore, how to solve these problems so that the adjustable armrest office chair has the advantages of high efficiency, low cost, easy assembly, etc. is a problem worthy of consideration by those with ordinary knowledge in this field. Summary of the Invention
[0005] The purpose of the present invention is to provide a seat that has the advantages of high efficiency, low cost, easy assembly and convenient adjustment of the position of the left and right armrests.
[0006] The seat of the present invention is adapted to be combined with two armrests. Each armrest includes a cross bar, and a first toothed structure is provided on the cross bar. The seat includes a base and two pressing devices. Among them, the base includes at least one armrest slot and two mounting holes. The armrest slot is adapted for the cross bar to be inserted, and the mounting holes communicate with the armrest slot. In addition, the two pressing devices are respectively installed in the two mounting holes. Each pressing device includes a mounting base, a pressing assembly, an operating assembly and a transmission assembly. Among them, the mounting base is installed and fixed in the mounting hole, and a mounting groove is further provided on one side of the mounting base. In addition, the pressing assembly is installed in the mounting groove. The pressing assembly is provided with a second toothed structure, and the second toothed structure faces the first toothed structure. The operating assembly is disposed on the other side of the mounting base relative to the mounting groove. In addition, the transmission assembly is connected between the pressing assembly and the operating assembly. Among them, the operating assembly is adapted to drive the transmission assembly, and the transmission assembly drives the pressing assembly to move towards the cross bar and press the cross bar, so that the second toothed structure is closely fitted with the first toothed structure.
[0007] Another embodiment of the present invention provides a seat adapted to be combined with two armrests. Each armrest includes a crossbar, and a crossbar groove is provided on the crossbar. The seat includes two first toothed structures, a base, and two pressing devices. The first toothed structure is embedded in the crossbar groove. The base includes at least one armrest slot and two mounting holes. The armrest slot is adapted for the crossbar to be inserted therein, and the mounting holes communicate with the armrest slot. In addition, the two pressing devices are respectively installed in the two mounting holes. Each pressing device includes a mounting base, a pressing component, an operating component, and a transmission component. The mounting base is installed and fixed in the mounting hole, and a mounting groove is provided on one side of the mounting base. The pressing component is installed in the mounting groove. The pressing component is provided with a second toothed structure, and the second toothed structure faces the first toothed structure. The operating component is disposed on the other side of the mounting base relative to the mounting groove. The transmission component is connected between the pressing component and the operating component. The operating component is adapted to drive the transmission component, and the transmission component drives the pressing component to move towards the crossbar and press the crossbar, so that the second toothed structure is closely engaged with the first toothed structure.
[0008] In the seat described above, the first toothed structure includes a plurality of first limiting strips arranged closely.
[0009] In the seat described above, the second toothed structure includes a plurality of second limiting strips arranged closely, and each second limiting strip is parallel to each first limiting strip.
[0010] In the seat described above, the operating component is a rotary handle, and the rotary handle has a central hole. The transmission component includes a mounting shaft and a pressing member. One end of the mounting shaft is installed in the central hole, and the pressing member is installed at the other end of the mounting shaft and is located in the mounting groove. A first ratchet member is provided on one side of the pressing member close to the mounting groove, and the pressing member presses the pressing component. A second ratchet member is provided at the bottom end of the mounting groove, and the second ratchet member is coupled with the first ratchet member. When the rotary handle rotates in one direction, the mounting shaft drives the first ratchet member and the second ratchet member to move relatively, and the pressing member drives the pressing component to move towards the crossbar and press the crossbar.
[0011] In the seat described above, the pressing member further includes two first limiting members, and the two first limiting members are respectively located on both sides of the first ratchet member and are in a parallel and symmetrical shape. The mounting groove further includes two second limiting members, and the two second limiting members are respectively located on both sides of the second ratchet member and are in a parallel and symmetrical shape.
[0012] The aforesaid seat further includes two anti-pulling plates. An embedding hole is disposed adjacent to each mounting hole of the base. The anti-pulling plate is mounted in the embedding hole. A first engaging edge and a second engaging edge are respectively disposed on two opposite sides of the mounting base. Via the first engaging edge and the second engaging edge, the mounting base is supported on the base, and the first engaging edge abuts against the anti-pulling plate.
[0013] In the aforesaid seat, the embedding hole and the mounting hole are separated by a support beam. The first engaging edge is supported on the support beam. The width of the first engaging edge is greater than the width of the support beam. The width of the second engaging edge interfering with the base is less than the width of the anti-pulling plate.
[0014] In the aforesaid seat, the anti-pulling plate has an anti-pulling-out structure, and the anti-pulling-out structure is clamped with the support beam.
[0015] The present invention has the following advantages: it enables the user to conveniently and quickly assemble the armrests on both sides of the seat cushion, and can also reduce the packaging size, greatly reducing the cost of transporting seat products.
[0016] To achieve the above and other purposes, the technical means, components and their effects adopted by the present invention are illustrated as follows with a preferred embodiment in conjunction with the drawings. Description of the Drawings
[0017] Figure 1A The figure shows a schematic diagram of the seat 10 of this embodiment.
[0018] Figure 1B The figure shows a schematic diagram of the seat 10 combined with two armrests 8.
[0019] Figure 1C The figure shows a schematic diagram of the mounting hole 122.
[0020] Figure 2 The figure shows a schematic diagram of the armrest 8.
[0021] Figure 3A And Figure 3B The figure shows a schematic diagram of the tightening device 13.
[0022] Figure 3C The figure shows a schematic diagram of the mounting groove 131G.
[0023] Figure 3D The figure shows a schematic diagram of the tightening component 132 facing the cross bar 81.
[0024] Figure 3E The figure shows a schematic diagram of the armrest 8'.
[0025] Figure 3F The figure shows a schematic diagram of the mounting base 231.
[0026] Figure 4A Shown is a schematic diagram of the pressing member 1342 in the installation groove 131G.
[0027] Figure 4B Shown is a schematic diagram of the positional relationship among the pressing assembly 132, the operating assembly 133, and the transmission assembly 134.
[0028] Figure 4C Shown is a schematic diagram of the transmission assembly 134 connected to the operating assembly 133.
[0029] Figure 4D Shown is a schematic diagram of the transmission assembly 134.
[0030] Figure 5A and Figure 5B Shown are schematic diagrams of the pressing device 13 and the anti-slip plate 14 at different angles.
[0031] Figure 5C Shown is a schematic diagram of the anti-slip plate 14.
[0032] Figure 5D Shown is Figure 1A an enlarged view of the marked X part.
[0033] Figure 6A Shown is a schematic diagram of the seat 40 of another embodiment.
[0034] Figure 6B and Figure 6C Shown is a schematic diagram of the first toothed structure 45 embedded in the crossbar groove 81G.
[0035] Figure 6D Shown is a schematic diagram of the pressing assembly 432.
[0036] Figure 6E Shown is a schematic diagram of the pressing assembly 432 abutted against the first toothed structure 45.
[0037] Figure 7 Shown is a schematic diagram of the first toothed structure 45.
[0038] Figure 8A Shown is a schematic diagram of the armrest 9.
[0039] Figure 8B Shown is a schematic diagram of the pressing assembly 432 abutted against the first toothed structure 95. Detailed implementation manners
[0040] Please refer to Figures 1A to 1C , Figure 1A Shown is a schematic diagram of the seat 10 of this embodiment. Figure 1BShown is a schematic diagram of the seat 10 combined with two armrests 8. Figure 1C Shown is a schematic diagram of the mounting holes 122 of the base 12.
[0041] The seat 10 of this embodiment includes a base 12 and two fastening devices 13. Among them, the base 12 includes two armrest slots 121, two mounting holes 122, two embedding holes 123 and two support beams 124. Each mounting hole 122 communicates with one of the armrest slots 121 respectively, and each mounting hole 122 is adjacent to one embedding hole 123 respectively. Among them, each mounting hole 122 and the adjacent embedding hole 123 are separated by a support beam 124.
[0042] Please refer to Figure 1C and Figure 2 , Figure 2 Shown is a schematic diagram of two armrests 8. The seat 10 is adapted to be combined with two armrests 8, and each armrest 8 includes a crossbar 81, and a crossbar groove 81G is provided on the crossbar 81. Specifically, one end of the crossbar 81 of the armrest 8 is inserted into the armrest slot 121 of the base 12. The horizontal length of the crossbar groove 81G is the range within which the armrest 8 can move, and the crossbar 81 also needs to pass through the fastening device 13 to fix the position of the armrest 8. As for how to fix the position of the armrest 8, examples will be given in the following paragraphs.
[0043] Please refer to Figures 3A to 3D , Figure 3A and Figure 3B Shown is a schematic diagram of the fastening device 13. Figure 3C Shown is a schematic diagram of the mounting groove 131G. Figure 3D Shown is a schematic diagram of the fastening assembly 132 facing the crossbar 81. The two fastening devices 13 are respectively installed in the two mounting holes 122. Each fastening device 13 includes a mounting base 131, a fastening assembly 132, an operating assembly 133 and a transmission assembly 134 (please refer to Figure 5). Among them, the mounting base 131 is installed and fixed in the mounting hole 122, and a mounting groove 131G and an anti-pulling member 131P are provided on one side of the mounting base 131. Among them, the anti-pulling member 131P is adapted to interfere with an edge 81E of the crossbar groove 81G of the crossbar 81. In this way, it can prevent the crossbar 81 from being pulled out or falling off from the armrest slot 121.
[0044] In this embodiment, the mounting base 131 is provided with the anti-pulling member 131P, and the crossbar 81 is provided with the crossbar groove 81G. However, in other embodiments, the positions of the anti-pulling member 131P and the crossbar groove 81G can also be swapped. Specifically, please refer to Figure 3E and Figure 3F, a anti-pulling member 81P is provided on the cross bar 81' of the armrest 8', and a slot 231G is further provided on the mounting base 231. The slot 231G and the mounting groove 131G are both provided on the same side of the mounting base 231. Among them, the anti-pulling member 81P of the cross bar 81' interferes with an edge of the slot 231G. In this way, it can also prevent the cross bar 81' of the armrest 8' from being pulled out or falling from the armrest slot 121.
[0045] In addition, the operating component 133 is arranged on the other side of the mounting base 131 relative to the mounting groove 131G, that is to say, the operating component 133 is exposed outside the base 12, so as to facilitate consumers to operate. The operating component 133 is, for example, a rotary handle, and the rotary handle has a central hole 133C. In addition, the pressing component 132 is installed in the mounting groove 131G and faces the cross bar 81.
[0046] In this embodiment, the operating component 133 is a rotary handle. However, in other embodiments, the operating component 133 can also be a knob. In this way, more subtle adjustment and control can be achieved, and it is easier to operate precisely.
[0047] Please refer to Figures 4A to 4D , Figure 4A , which shows a schematic diagram of the pressing member 1342 in the mounting groove 131G, Figure 4B , which shows a schematic diagram of the positional relationship among the pressing component 132, the operating component 133 and the transmission component 134, Figure 4C , which shows a schematic diagram of the transmission component 134 linked to the operating component 133, Figure 4D , which shows a schematic diagram of the transmission component 134. In this embodiment, the transmission component 134 is connected between the pressing component 132 and the operating component 133. The transmission component 134 includes a mounting shaft 1341 and a pressing member 1342. One end of the mounting shaft 1341 is mounted on the central hole 133C, and the pressing member 1342 is mounted on the other end of the mounting shaft 1341 and is located in the mounting groove 131G. Among them, the upper and lower sides of the mounting shaft 1341 are arc surfaces, and the left and right sides are flat anti-fooling structure designs (please refer to Figure 4D ), this structure is beneficial to avoid errors caused by human operation factors, so as to improve the reliability, stability and safety of the product.
[0048] In addition, the pressing member 1342 presses the pressing component 132, and the pressing member 1342 includes a first ratchet member 1342R and two first limiting members 1342L. Among them, the first ratchet member 1342R is close to one side of the mounting groove 131G, and the two first limiting members 1342L are respectively located on both sides of the first ratchet member 1342R and are parallel and symmetrical to each other.
[0049] In addition, please refer to again Figure 3C , the installation groove 131G includes a second ratchet member 131R, a through hole 131H, and two second limiting members 1312. Among them, the second ratchet member 131R is disposed at the bottom end of the installation groove 131G, the through hole 131H is located at the center of the second ratchet member 131R, the hole center of the through hole 131H and the hole center of the central hole 133C are on the same straight line, and the installation shaft 1341 passes through the through hole 131H. In other words, the second ratchet member 131R is between the pressing member 1342 and the operating assembly 133.
[0050] Moreover, the second ratchet member 131R is coupled with the first ratchet member 1342R. Specifically, when the rotary handle is in the open state, the highest point of the first ratchet member 1342R touches the lowest point of the second ratchet member 131R, and the highest point of the second ratchet member 131R also touches the lowest point of the first ratchet member 1342R, forming a state where the two ratchet members are coupled to each other. In this state, the position of the armrest 8 can be adjusted within a certain range, and this range is the lateral length of the crossbar groove 81G.
[0051] In addition, the two second limiting members 1312 of the installation groove 131G are respectively located on both sides of the second ratchet member 131R and are parallel and symmetric to each other. And when the second ratchet member 131R is coupled with the first ratchet member 1342R, the two first limiting members 1342L and the two second limiting members 1312 are arranged in an interlaced manner. Therefore, through the first limiting member 1342L and the second limiting member 1312, the rotation range of the rotary handle (operating assembly 133) can be restricted.
[0052] In this embodiment, the operating assembly 133 is adapted to drive the transmission assembly 134, and the transmission assembly 134 drives the tightening assembly 132 to move toward the crossbar 81 and tighten the crossbar 81. Specifically, when the rotary handle is rotated in one direction (closed state), the installation shaft 1341 drives the first ratchet member 1342R and the second ratchet member 131R to generate relative movement, and the highest point of the first ratchet member 1342R touches the highest point of the second ratchet member 131R, so that the pressing member 1342 drives the tightening assembly 132 to move toward the crossbar 81. In this way, the tightening assembly 132 will fix the crossbar 81, and a frictional force with a certain strength is formed between the surface of the tightening assembly 132 and the surface of the crossbar 81, so that the crossbar 81 cannot be easily moved by an external force. Conversely, when the rotary handle is rotated back to its original position, the surface of the tightening assembly 132 will be separated from the surface of the crossbar 81, and in this way, the user can adjust the crossbar 81 of the armrest 8 within a certain range.
[0053] Please refer to Figure 5A and Figure 5B , Figure 5Aand Figure 5B are schematic diagrams of the pressing device 13 and the anti-slip plate 14 at different angles, Figure 5C is a schematic diagram of the anti-slip plate 14, Figure 5D is shown as Figure 1A an enlarged view of the marked X part in the figure. The seat 10 further includes two anti-slip plates 14, and each anti-slip plate 14 is respectively installed in an embedding hole 123. In this embodiment, the anti-slip plate 14 has an anti-pulling structure 141, and the anti-pulling structure 141 is engaged with the support beam 124 of the base 12. Therefore, when the anti-slip plate 14 is placed in the embedding hole 123, the anti-pulling structure 141 can prevent the anti-slip plate 14 from falling off the embedding hole 123. In addition, when an external force presses the anti-pulling structure 141, the anti-pulling structure 141 can avoid the support beam 124 and is not engaged with the support beam 124, so as to move the anti-slip plate 14 out of the embedding hole 123.
[0054] In addition, opposite sides of the mounting base 131 are respectively provided with a first engaging edge 131F and a second engaging edge 131S. Among them, through the first engaging edge 131F and the second engaging edge 131S, the mounting base 131 can be supported on the base 12, and the first engaging edge 131F will abut against the anti-slip plate 14. Specifically, the width W1 of the first engaging edge 131F (please refer to Figure 3A ) is greater than the width W2 of the support beam 124 (please refer to Figure 5D ), and the width of the interference between the second engaging edge 131S and the base 12 is less than the width W3 of the anti-slip plate 14 (please refer to Figure 5A ). In this embodiment, the width of the interference between the second engaging edge 131S and the base 12 is the overall width W4 of the second engaging edge 131S (please refer to Figure 5A ). Therefore, when the anti-slip plate 14 has not been placed in the embedding hole 123, the mounting base 131 can be installed in the mounting hole 122, and the first engaging edge 131F is supported on the lower surface of the support beam 124. Then, the anti-slip plate 14 is placed in the embedding hole 123, and the side surface of the first engaging edge 131F will abut against the anti-slip plate 14.
[0055] In addition, if the cross bar 81 of the armrest 8 needs to be detached from the base 12, the anti-slip plate 14 needs to be moved out of the embedding hole 123 first. Then, the mounting base 131 of the pressing device 13 is moved in the direction of the embedding hole 123, and the pressing device 13 can be separated from the base 12. Then, since the cross bar groove 81G of the cross bar 81 is not blocked by the anti-pulling member 131P of the pressing device 13, the cross bar 81 of the armrest 8 can be pulled out from the armrest slot 121. Therefore, the seat 10 of this embodiment can easily assemble and disassemble the two armrests 8 on both sides. In this way, it is beneficial to reduce the size of the outer packaging box of the seat 10 and greatly reduce the cost of transporting products.
[0056] Please refer to Figures 6A to 6E , Figure 6A which shows a schematic diagram of the seat 40 of another embodiment, Figure 6B and Figure 6C which shows a schematic diagram of the first toothed structure 45 embedded in the crossbar groove 81G, Figure 6D which shows a schematic diagram of the tightening assembly 432, Figure 6E which shows a schematic diagram of the tightening assembly 432 abutted against the first toothed structure 45. The difference between the seat 40 and the seat 10 is that the seat 40 further includes two first toothed structures 45, and the first toothed structure 45 includes a plurality of first limiting strips 45L arranged closely (please refer to Figure 7 ), and each first toothed structure 45 is respectively embedded in the crossbar groove 81G.
[0057] In addition, the tightening assembly 432 of the seat 40 is further provided with a second toothed structure 4320, and the second toothed structure 4320 faces the first toothed structure 45. Among them, the second toothed structure 4320 includes a plurality of second limiting strips 4320L arranged closely (please refer to Figure 6D ), and each second limiting strip 4320L is parallel to each first limiting strip 45L. In this embodiment, when the transmission assembly 134 drives the tightening assembly 432 to move towards the crossbar 81 and tighten the crossbar 81, the second toothed structure 4320 and the first toothed structure 45 will be closely combined. Since a plurality of second limiting strips 4320L are all parallel to a plurality of first limiting strips 45L, it is easier to determine the position of the armrest 8 when they are closely combined. In this way, the user can easily adjust the distance between the left and right armrests 8.
[0058] In the foregoing embodiment, the first toothed structure 45 of the seat 40 is embedded in the crossbar groove 81G of the crossbar 81. However, in other embodiments, the crossbar 81 and the first toothed structure 45 can also be an integral structure, that is to say, this embodiment does not have the technical feature of the crossbar groove 81G. For example, please refer to Figures 8A to 8B , a first toothed structure 95 is provided on the crossbar 91 of the armrest 9. In other words, the crossbar 91 and the first toothed structure 95 are of an integral structure. And. The technical features of the first toothed structure 95 itself are equivalent to the technical features of the first toothed structure 45. Among them, when the tightening assembly 432 moves towards the crossbar 91 and tightens the crossbar 91, the second toothed structure 4320 and the first toothed structure 95 will be closely combined. In this way, the user can also easily adjust the distance between the left and right armrests 9.
[0059] In summary, compared with traditional adjustable armrest office chairs, when assembling the armrest 8 and the tightening device 13 on the seat 10 and the seat 40 of this embodiment, there is no need to use other parts (such as screws) to lock the mounting base 131, which facilitates the user to assemble the armrests 8 on both sides by themselves and also reduces the production cost. Moreover, the distance between the left and right armrests 8 can be easily adjusted.
[0060] The present invention is described above, but it is not intended to limit the scope of the patent rights claimed by the present invention. Any changes or modifications made by those skilled in the art without departing from the spirit or scope of this patent belong to the equivalent changes or designs completed under the spirit disclosed by the present invention and should be included in the claims of the present invention.
Claims
1. A chair seat, suitable for combining two armrests, each of the armrests comprises a crossbar, and the crossbar is provided with a first tooth structure, the chair seat, characterized in that: include: A base, comprising at least one armrest slot and two mounting holes, wherein the armrest slot is suitable for the crossbar to be inserted, and the mounting hole is connected to the armrest slot; and Two clamping devices are respectively installed in the two mounting holes, and each of the clamping devices includes: A mounting base is mounted and fixed on the mounting hole, and a mounting groove is provided on one side of the mounting base; A clamping assembly is installed in the installation groove, and the clamping assembly is provided with a second tooth structure, and the second tooth structure faces the first tooth structure; an operating assembly, disposed on another side of the mounting base relative to the mounting slot; and A transmission assembly connected between the clamping assembly and the operating assembly; The operating assembly is suitable for driving the transmission assembly, and the transmission assembly drives the clamping assembly to move toward the crossbar and clamp the crossbar, so that the second toothed structure is tightly fitted with the first toothed structure.
2. A chair seat, suitable for combining two armrests, each of the armrests comprises a crossbar, and the crossbar is provided with a crossbar groove, the chair seat, characterized in that: include: Two first tooth-shaped structures are respectively embedded in the crossbar groove; A base, comprising at least one armrest slot and two mounting holes, wherein the armrest slot is suitable for the crossbar to be inserted, and the mounting hole is connected to the armrest slot; and Two clamping devices are respectively installed in the two mounting holes, and each of the clamping devices includes: A mounting base is mounted and fixed on the mounting hole, and a mounting groove is provided on one side of the mounting base; A clamping assembly is installed in the installation groove, and the clamping assembly is provided with a second tooth structure, and the second tooth structure faces the first tooth structure; an operating assembly, disposed on another side of the mounting base relative to the mounting slot; and A transmission assembly connected between the clamping assembly and the operating assembly; The operating assembly is suitable for driving the transmission assembly, and the transmission assembly drives the clamping assembly to move toward the crossbar and clamp the crossbar, so that the second toothed structure is tightly fitted with the first toothed structure.
3. The chair seat according to claim 1 or claim 2, characterized in that: The first toothed structure includes a plurality of closely arranged first limiting strips.
4. The chair seat as claimed in claim 3, characterized in that: The second toothed structure includes a plurality of closely arranged second limiting strips, and each of the second limiting strips is parallel to each of the first limiting strips.
5. The chair seat according to claim 1 or claim 2, characterized in that: The operating assembly is a rotating handle, and the rotating handle has a center hole, and the transmission assembly includes a mounting shaft and a pressing member, one end of the mounting shaft is mounted on the center hole, and the pressing member is mounted on the other end of the mounting shaft and is located in the mounting groove, and a first ratchet member is provided on a side of the pressing member close to the mounting groove, and the pressing member presses the clamping assembly; Wherein, a second ratchet member is disposed at the bottom end of the mounting groove, and the second ratchet member is coupled with the first ratchet member; When the rotating handle rotates in one direction, the installation shaft drives the first ratchet member and the second ratchet member to move relative to each other, and the pressing member drives the clamping assembly to move toward the crossbar and clamp the crossbar.
6. The chair seat according to claim 5, characterized in that: The pressing member further comprises two first limiting members, which are respectively located on two sides of the first ratchet member and are parallel and symmetrical; The installation slot also includes two second limiting members, which are respectively located on two sides of the second ratchet member and are parallel and symmetrical.
7. The chair seat according to claim 1 or claim 2, characterized in that: It also includes two stop plates, wherein an embedding hole is arranged adjacent to each mounting hole of the base, the stop plate is installed in the embedding hole, and a first clamping edge and a second clamping edge are respectively arranged on the opposite sides of the mounting base; the mounting base is supported on the base via the first clamping edge and the second clamping edge, and the first clamping edge abuts against the stop plate.
8. The chair seat according to claim 7, characterized in that: The embedding hole and the mounting hole are separated by a support beam, and the first snap-fit edge is supported on the support beam. The width of the first snap-fit edge is greater than the width of the support beam, and the width of the second snap-fit edge interfering with the base is less than the width of the stop plate.
9. The chair seat according to claim 8, characterized in that: The anti-slip plate has an anti-pullout structure, and the anti-pullout structure is clamped with the support beam.