TWI875351B - Chair seat - Google Patents

Abstract

The chair seat of the invention is suitable for attaching two armrests, each comprising a crossbar with a first tooth structure. The chair seat comprises a base and two clamping devices. The base includes at least one armrest slot and two mounting holes, where the armrest slot is designed for the insertion of the respective crossbar, and the mounting holes are in communication with the armrest slots. Two clamping devices are respectively installed in the two mounting holes. Each clamping device consists of a mounting base, a clamping element, an operating component, and a transmission element. The mounting base is fixedly installed in the mounting hole, and one side of the mounting base also features an installation groove. The clamping element is installed within the installation groove and incorporates a second tooth structure facing the first tooth structure. The operating component is positioned on the other side of the mounting base opposite the installation groove. The transmission element connects the clamping element and the operating component. The operating component is designed to drive the transmission element, which in turn moves the clamping element towards the crossbar to clamp it, allowing the second tooth structure to snugly engage with the first tooth structure. This chair seat invention facilitates the adjustment of the distance between the left and right armrests.

Description

Seat

The present invention relates to a chair seat, and more particularly to a chair seat having a first tooth-shaped structure and a clamping element.

Nowadays, the requirements for working and living environments are increasing, 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 an adjustable function to adapt to different user heights, body shapes and usage methods. The design of the adjustable armrest office chair is to meet these needs. However, the disadvantages of this design method are also obvious. First, the assembly is more difficult, and it is difficult for users who do not have 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 cost of production. Finally, because it is more difficult to assemble, it is not suitable for the furniture DIY market. Therefore, how to solve these problems so that the adjustable armrest office chair has the advantages of high efficiency, low cost, and easy assembly is a question worth thinking about by people with general knowledge in this field.

The purpose of the present invention is to provide a chair seat, which has the advantages of high efficiency, low cost, easy assembly and convenient adjustment of the position of the left and right armrests. The chair seat of the present invention is suitable for combining two armrests, each armrest includes a crossbar, and a first tooth structure is provided on the crossbar. The chair seat includes a base and two clamping devices. Among them, the base includes at least one armrest slot and two mounting holes, the armrest slot is suitable for the crossbar to be inserted, and the mounting hole is connected to the armrest slot. In addition, two clamping devices are respectively installed in the two mounting holes, and each clamping device includes a mounting base, a clamping element, an operating element and a transmission element. Among them, the mounting base is installed and fixed in the mounting hole, and a mounting groove is also provided on one side of the mounting base. In addition, the clamping element is installed in the mounting groove, and the clamping element is provided with a second tooth structure, and the second tooth structure faces the first tooth structure. The operating element is arranged on the other side of the mounting base relative to the mounting groove. In addition, the transmission element is connected between the clamping element and the operating element. Among them, the operating element is suitable for driving the transmission element, and the transmission element drives the clamping element to move toward the crossbar and clamp the crossbar, so that the second tooth structure is closely fitted with the first tooth structure. Another embodiment of the present invention is suitable for combining two armrests, each armrest includes a crossbar, and a crossbar groove is provided on the crossbar. The seat includes two first tooth structures, a base and two clamping devices. Wherein, the first tooth-shaped structure is embedded in the crossbar groove. In addition, the base includes at least one armrest slot and two mounting holes, the armrest slot is suitable for the crossbar to be inserted, and the mounting hole is connected to the armrest slot. In addition, two clamping devices are respectively installed in the two mounting holes, and each clamping device includes a mounting base, a clamping element, an operating element and a transmission element. Wherein, the mounting base is installed and fixed in the mounting hole, and a mounting groove is also provided on one side of the mounting base. In addition, the clamping element is installed in the mounting groove, and the clamping element is provided with a second tooth-shaped structure, and the second tooth-shaped structure faces the first tooth-shaped structure. The operating element is arranged on the other side of the mounting base relative to the mounting groove. In addition, the transmission element is connected between the clamping element and the operating element. The operating element is suitable for driving the transmission element, and the transmission element drives the clamping element to move toward the crossbar and clamp the crossbar, so that the second tooth structure is closely matched with the first tooth structure. In the above-mentioned seat, the first tooth structure includes a plurality of closely arranged first limit strips. In the above-mentioned seat, the second tooth structure includes a plurality of closely arranged second limit strips, and each second limit strip is parallel to each first limit strip. In the chair seat described above, the operating element is a rotating handle, and the rotating handle has a central hole, and the transmission element includes a mounting shaft and a pressing member, one end of the mounting shaft is mounted in the central 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 one side of the pressing member close to the mounting groove, and the pressing member presses the clamping element. A second ratchet member is provided at the bottom end of the mounting groove, and the second ratchet member is coupled to the first ratchet member. When the rotary handle is rotated in one direction, the mounting shaft drives the first ratchet and the second ratchet to move relative to each other, and the pressing member drives the clamping element to move toward the crossbar and clamp the crossbar. In the above-mentioned chair seat, the pressing member also includes two first limit members, which are respectively located on both sides of the first ratchet and are parallel and symmetrical; wherein the mounting slot also includes two second limit members, which are respectively located on both sides of the second ratchet and are parallel and symmetrical. The chair seat described above also includes two anti-slip plates, wherein an embedding hole is provided near each mounting hole of the base, and the anti-slip plate is installed in the embedding hole, and a first clamping edge and a second clamping edge are provided on opposite sides of the mounting base respectively; 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 anti-slip plate. In the above-mentioned chair seat, the embedding hole and the mounting hole are separated by a supporting beam, and the first engaging edge is supported on the supporting beam, and the width of the first engaging edge is greater than the width of the supporting beam, and the width of the second engaging edge interfering with the base is less than the width of the anti-slip plate. In the above-mentioned chair seat, the anti-slip plate has an anti-pullout structure, and the anti-pullout structure is engaged with the supporting beam. The present invention has the following advantages: it allows users to conveniently and quickly assemble the armrests on both sides of the chair cushion, and it can also reduce the packaging size, greatly reducing the cost of transporting chair seat products. In order to make the above features and advantages of the present invention more clearly understood, the following is a detailed description of the preferred embodiment with the accompanying drawings.

Please refer to Figures 1A to 1C. Figure 1A is a schematic diagram of the seat 10 of this embodiment, Figure 1B is a schematic diagram of the seat 10 combined with two armrests 8, and Figure 1C is a schematic diagram of the mounting hole 122 of the base 12. The seat 10 of this embodiment includes a base 12 and two clamping devices 13. The base 12 includes two armrest slots 121, two mounting holes 122, two embedding holes 123, and two supporting beams 124. Each mounting hole 122 is interconnected with one of the armrest slots 121, and each mounting hole 122 is adjacent to an embedding hole 123. Each mounting hole 122 is separated from the adjacent embedding hole 123 by a supporting beam 124. Please refer to Figure 1C and Figure 2. Figure 2 shows a schematic diagram of two armrests 8. The seat 10 is suitable for combining two armrests 8, and each armrest 8 includes a crossbar 81, and a crossbar slot 81G is provided on the crossbar 81. In detail, one end of the crossbar 81 of the armrest 8 is inserted into the armrest slot 121 of the base 12, and the transverse length of the crossbar slot 81G is the movable range of the armrest 8. The crossbar 81 also needs to be fixed by the clamping device 13 to fix the position of the armrest 8. As for how to fix the position of the armrest 8, the following paragraph will give another example to explain. Please refer to FIG. 3A to FIG. 3D. FIG. 3A and FIG. 3B are schematic diagrams of the clamping device 13, FIG. 3C is a schematic diagram of the mounting groove 131G, and FIG. 3D is a schematic diagram of the clamping element 132 facing the crossbar 81. The two clamping devices 13 are respectively mounted on the two mounting holes 122, and each clamping device 13 includes a mounting base 131, a clamping element 132, an operating element 133, and a transmission element 134 (see FIG. 5). The mounting base 131 is mounted and fixed in the mounting hole 122, and one side of the mounting base 131 is provided with a mounting groove 131G and an anti-pullout member 131P. The anti-pullout member 131P is adapted to interfere with an edge 81E of the crossbar groove 81G of the crossbar 81. In this way, the crossbar 81 can be prevented from being pulled out or falling from the armrest slot 121. In this embodiment, the mounting base 131 is provided with the anti-pullout member 131P, and the crossbar 81 is provided with the crossbar groove 81G. However, in other embodiments, the positions of the anti-pullout member 131P and the crossbar groove 81G can also be interchanged. For details, please refer to FIG. 3E and FIG. 3F. The horizontal bar 81' of the handrail 8' is provided with an anti-pullout member 81P, and the mounting base 231 is also provided with a slot 231G. The slot 231G and the mounting slot 131G are both arranged on the same side of the mounting base 231. Among them, the anti-pullout member 81P of the horizontal bar 81' interferes with one edge of the slot 231G. In this way, the horizontal bar 81' of the handrail 8' can also be prevented from being pulled out or falling out of the handrail slot 121. In addition, the operating element 133 is arranged on the other side of the mounting base 131 relative to the mounting slot 131G, that is, the operating element 133 is exposed outside the base 12, which is convenient for consumers to operate. The operating element 133 is, for example, a rotary handle having a central hole 133C. In addition, the clamping element 132 is mounted in the mounting groove 131G and faces the crossbar 81. In this embodiment, the operating element 133 is a rotary handle. However, in other embodiments, the operating element 133 may also be a knob. In this way, more subtle adjustments and controls can be achieved, making it easier to operate accurately. Please refer to Figures 4A to 4D, Figure 4A shows a schematic diagram of the pressure member 1342 in the mounting groove 131G, Figure 4B shows a schematic diagram of the positional relationship between the clamping element 132, the operating element 133 and the transmission element 134, Figure 4C shows a schematic diagram of the transmission element 134 connected to the operating element 133, and Figure 4D shows a schematic diagram of the transmission element 134. In this embodiment, the transmission element 134 is connected between the clamping element 132 and the operating element 133. The transmission element 134 includes a mounting shaft 1341 and a pressing member 1342. One end of the mounting shaft 1341 is mounted on the center 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. The upper and lower sides of the mounting shaft 1341 are arc surfaces, and the left and right sides are flat surfaces. The foolproof structure design (see Figure 4D) is conducive to avoiding errors caused by human operation factors, so as to improve the reliability, stability and safety of the product. In addition, the pressing member 1342 presses against the pressing element 132, and the pressing member 1342 includes a first ratchet member 1342R and two first stop members 1342L. The first ratchet member 1342R is close to one side of the mounting groove 131G, and the two first stop members 1342L are respectively located on both sides of the first ratchet member 1342R and are parallel and symmetrical to each other. In addition, please refer to FIG. 3C again, the mounting groove 131G includes a second ratchet member 131R, a through hole 131H and two second stop members 1312. The second ratchet 131R is disposed at the bottom of the mounting groove 131G, the through hole 131H is located at the center of the second ratchet 131R, the hole center of the through hole 131H and the hole center of the center hole 133C are on the same straight line, and the mounting shaft 1341 passes through the through hole 131H. In other words, the second ratchet 131R is between the pressing member 1342 and the operating element 133. In addition, the second ratchet 131R is coupled with the first ratchet 1342R. Specifically, when the rotary handle is in the open state, the highest point of the first ratchet 1342R touches the lowest point of the second ratchet 131R, and the highest point of the second ratchet 131R also touches the lowest point of the first ratchet 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, which is the horizontal length of the crossbar groove 81G. In addition, the two second stoppers 1312 of the mounting groove 131G are also located on both sides of the second ratchet 131R, and are parallel and symmetrical to each other. Furthermore, when the second ratchet 131R is coupled with the first ratchet 1342R, the two first limiters 1342L and the two second limiters 1312 are arranged in an interlaced manner. Therefore, the first limiter 1342L and the second limiter 1312 can limit the range of rotation of the rotary handle (operating element 133). In this embodiment, the operating element 133 is suitable for driving the transmission element 134, and the transmission element 134 drives the clamping element 132 to move toward the crossbar 81 and clamp the crossbar 81. Specifically, when the rotary handle is rotated in one direction (closed state), the mounting shaft 1341 drives the first ratchet 1342R and the second ratchet 131R to move relative to each other, and the highest point of the first ratchet 1342R touches the highest point of the second ratchet 131R, so that the pressing member 1342 drives the clamping element 132 to move toward the crossbar 81. In this way, the clamping element 132 fixes the crossbar 81, so that a certain degree of friction is formed between the surface of the clamping element 132 and the surface of the crossbar 81, so that the crossbar 81 cannot be easily moved by external force. On the contrary, when the rotary handle is rotated to the original position, the surface of the clamping element 132 will be separated from the surface of the crossbar 81, so that the user can adjust the crossbar 81 of the armrest 8 within a certain range. Please refer to Figures 5A and 5B, which are schematic diagrams of the clamping device 13 and the anti-slide plate 14 at different angles, Figure 5C is a schematic diagram of the anti-slide plate 14, and Figure 5D is an enlarged view of the X-marked portion in Figure 1A. The seat 10 also includes two anti-slide plates 14, each of which is installed in an embedded hole 123. In this embodiment, the anti-slide plate 14 has an anti-pullout structure 141, and the anti-pullout structure 141 is clamped with the support beam 124 of the base 12. Therefore, when the anti-slip plate 14 is inserted into the embedding hole 123, the anti-pullout structure 141 can prevent the anti-slip plate 14 from falling off from the embedding hole 123. In addition, when an external force presses the anti-pullout structure 141, the anti-pullout structure 141 can avoid the support beam 124 and not be connected to the support beam 124, thereby moving the anti-slip plate 14 out of the embedding hole 123. In addition, the mounting base 131 is provided with a first engaging edge 131F and a second engaging edge 131S on two opposite sides thereof. The mounting base 131 can be supported on the base 12 through the first engaging edge 131F and the second engaging edge 131S, and the first engaging edge 131F will abut against the anti-slip plate 14. Specifically, the width W1 of the first engaging edge 131F (see FIG. 3A ) is greater than the width W2 of the support beam 124 (see FIG. 5D ), and the width of the second engaging edge 131S interfering with the base 12 is less than the width W3 of the stop plate 14 (see FIG. 5A ). In this embodiment, the width of the second engaging edge 131S interfering with the base 12 is the entire width W4 of the second engaging edge 131S (see FIG. 5A ). Therefore, when the stop plate 14 is not inserted into the embedding hole 123 , the mounting base 131 can be mounted in the mounting hole 122 , and the first engaging edge 131F is supported on the lower surface of the support beam 124 . After that, 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. In addition, if the crossbar 81 of the armrest 8 is to be removed from the base 12, the anti-slip plate 14 must be moved out of the embedding hole 123 first. After that, the mounting base 131 of the clamping device 13 is moved toward the embedding hole 123, so that the clamping device 13 can be separated from the base 12. Then, since the crossbar groove 81G of the crossbar 81 will not be blocked by the anti-pullout piece 131P of the clamping device 13, the crossbar 81 of the armrest 8 can be pulled out from the armrest slot 121. Therefore, the chair seat 10 of this embodiment can easily assemble and disassemble the armrests 8 on both sides. In this way, it is beneficial to reduce the size of the outer packaging box of the seat 10, greatly reducing the cost of transporting the product. Please refer to Figures 6A to 6E. Figure 6A shows a schematic diagram of the seat 40 of another embodiment, Figures 6B and 6C show schematic diagrams of the first tooth structure 45 embedded in the crossbar groove 81G, Figure 6D shows a schematic diagram of the clamping element 432, and Figure 6E shows a schematic diagram of the clamping element 432 against the first tooth structure 45. The difference between the seat 40 and the seat 10 is that the seat 40 further includes two first tooth structures 45, the first tooth structure 45 includes a plurality of closely arranged first limit strips 45L (see FIG. 7), and each first tooth structure 45 is respectively embedded in the crossbar groove 81G. In addition, the clamping element 432 of the seat 40 is also provided with a second tooth structure 4320, and the second tooth structure 4320 faces the first tooth structure 45. Among them, the second tooth structure 4320 includes a plurality of closely arranged second limit strips 4320L (see FIG. 6D), and each second limit strip 4320L is parallel to each first limit strip 45L. In this embodiment, when the transmission element 134 drives the clamping element 432 to move toward the crossbar 81 and clamp the crossbar 81, the second tooth structure 4320 and the first tooth structure 45 will be tightly fitted. Since the plurality of second limit strips 4320L are parallel to the plurality of first limit strips 45L, it is easier to determine the position of the armrest 8 when they are tightly fitted. In this way, the user can easily adjust the distance between the left and right armrests 8. In the aforementioned embodiment, the first tooth 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 tooth structure 45 may also be an integrated structure, that is, this embodiment does not have the technical feature of the crossbar groove 81G. For example, please refer to Figures 8A to 8B. A first tooth structure 95 is provided on the crossbar 91 of the handrail 9. In other words, the crossbar 91 and the first tooth structure 95 are an integrated structure. And. The technical features of the first tooth structure 95 itself are equivalent to the technical features of the first tooth structure 45. Among them, when the transmission and tightening element 432 moves toward the crossbar 91 and tightens the crossbar 91, the second tooth structure 4320 and the first tooth structure 95 will fit closely. In this way, the user can also easily adjust the distance between the left and right armrests 9. In summary, compared with the traditional adjustable armrest office chair, the seat 10 and the seat 40 of this embodiment do not need to use other parts (such as screws) to lock the mounting base 131 when assembling the armrest 8 and the clamping device 13, which is convenient for the user to assemble the armrests 8 on both sides by himself, and also reduces the production cost. In addition, the distance between the left and right armrests 8 can be easily adjusted. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the patent application attached hereto.

8, 8', 9: Armrest 81, 81', 91: Crossbar 81G: Crossbar slot 81E: Edge of crossbar slot 81P: Anti-pullout piece 10, 40: Seat 12: Base 121: Armrest slot 122: Mounting hole 123: Embedding hole 124: Support beam 13: Clamping device 131, 231: Mounting base 1312: Second stopper 131R: Second ratchet piece 131F: First engaging edge 131S: Second engaging edge 131P: Anti-pullout piece 131G: Mounting slot 131H: Through hole 132, 432: Clamping element 133: Operating element 133C: Center hole 134: Transmission element 1341: Mounting shaft 1342: Pressure element 1342R: First ratchet element 1342L: First limit element 14: Anti-slip plate 141: Anti-pullout structure 231G: Slot 45, 95: First tooth structure 45L: First limit strip 4320: Second tooth structure 4320L: Second limit strip X: Local range of the base W1: Width of the first engagement edge W2: Width of the support beam W3: Width of the anti-slip plate W4: Overall width of the second engagement edge

FIG. 1A is a schematic diagram of the seat 10 of the present embodiment. FIG. 1B is a schematic diagram of the seat 10 combined with two armrests 8. FIG. 1C is a schematic diagram of the mounting hole 122. FIG. 2 is a schematic diagram of the armrest 8. FIG. 3A and FIG. 3B are schematic diagrams of the clamping device 13. FIG. 3C is a schematic diagram of the mounting groove 131G. FIG. 3D is a schematic diagram of the clamping element 132 facing the crossbar 81. FIG. 3E is a schematic diagram of the armrest 8'. FIG. 3F is a schematic diagram of the mounting base 231. FIG. 4A is a schematic diagram of the pressure member 1342 in the mounting groove 131G. FIG. 4B is a schematic diagram showing the positional relationship between the clamping element 132, the operating element 133 and the transmission element 134. FIG. 4C is a schematic diagram showing the transmission element 134 connected to the operating element 133. FIG. 4D is a schematic diagram showing the transmission element 134. FIG. 5A and FIG. 5B are schematic diagrams showing the clamping device 13 and the anti-slip plate 14 at different angles. FIG. 5C is a schematic diagram showing the anti-slip plate 14. FIG. 5D is an enlarged view of the portion marked X in FIG. 1A. FIG. 6A is a schematic diagram showing a seat 40 of another embodiment. FIG. 6B and FIG. 6C are schematic diagrams showing the first tooth structure 45 embedded in the crossbar groove 81G. FIG. 6D is a schematic diagram showing the clamping element 432. FIG. 6E is a schematic diagram showing the clamping element 432 abutting against the first tooth-shaped structure 45. FIG. 7 is a schematic diagram showing the first tooth-shaped structure 45. FIG. 8A is a schematic diagram showing the handrail 9. FIG. 8B is a schematic diagram showing the clamping element 432 abutting against the first tooth-shaped structure 95.

40: Seat

12: Base

121: Armrest slot

124: Support beam

13: Clamping device

133: Operating elements

45: First tooth structure

Claims (9)

A chair seat is suitable for combining two armrests, each of which includes a crossbar, and a first tooth-shaped structure is provided on the crossbar, and the first tooth-shaped structure includes a plurality of closely arranged first limit strips. The chair seat includes: a base, including at least one armrest slot and two mounting holes, 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, each of which includes: a mounting base, installed and fixed in the mounting hole, and a mounting groove is further provided on one side of the mounting base; a clamping element, installed in the mounting groove, The clamping element is provided with a second tooth-shaped structure, the second tooth-shaped structure faces the first tooth-shaped structure, the second tooth-shaped structure includes a plurality of closely arranged second limit strips, and each of the second limit strips is parallel to each of the first limit strips; an operating element is arranged on the other side of the mounting base relative to the mounting groove; and a transmission element is connected between the clamping element and the operating element; wherein the operating element is suitable for driving the transmission element, and the transmission element drives the clamping element to move toward the crossbar and clamp the crossbar, so that the second tooth-shaped structure is tightly fitted with the first tooth-shaped structure. A chair seat, suitable for combining two armrests, each of which includes a crossbar, and a crossbar groove is provided on the crossbar. The chair seat includes: two first tooth-shaped structures, respectively embedded in the crossbar groove; a base, including at least one armrest slot and two mounting holes, 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, respectively installed in the two mounting holes, each of which includes: A mounting base, installed and fixed in the mounting hole, and one side of the mounting base is also provided with A mounting groove is provided; a clamping element is installed in the mounting groove, the clamping element is provided with a second tooth structure, the second tooth structure faces the first tooth structure; an operating element is provided on the other side of the mounting base relative to the mounting groove; and a transmission element is connected between the clamping element and the operating element; wherein the operating element is suitable for driving the transmission element, and the transmission element drives the clamping element to move toward the crossbar and clamp the crossbar, so that the second tooth structure is tightly fitted with the first tooth structure. A chair seat as described in claim 2, wherein the first tooth-shaped structure includes a plurality of closely arranged first limiting strips. The chair seat as described in claim 3, wherein the second tooth-shaped 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. A chair seat as described in claim 1 or claim 2, wherein the operating element is a rotary handle having a center hole, and the transmission element includes a mounting shaft and a pressure piece, one end of the mounting shaft is mounted in the center hole, and the pressure piece is mounted on the other end of the mounting shaft and is located in the mounting groove, and a first ratchet is provided on one side of the pressure piece close to the mounting groove The mounting groove has a second ratchet member, and the pressing member presses against the clamping element; wherein 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; wherein, when the rotating handle is rotated in one direction, the mounting shaft drives the first ratchet member and the second ratchet member to move relative to each other, and the pressing member drives the clamping element to move toward the crossbar and clamp the crossbar. As described in claim 5, the pressure member further includes two first limit members, the two first limit members are respectively located on both sides of the first ratchet member and are parallel and symmetrical; the mounting groove further includes two second limit members, the two second limit members are respectively located on both sides of the second ratchet member and are parallel and symmetrical. The chair seat as described in claim 1 or claim 2 further comprises two anti-slip plates, wherein an embedding hole is provided near each mounting hole of the base, the anti-slip plate is installed in the embedding hole, and a first clamping edge and a second clamping edge are provided on opposite sides of the mounting base respectively; 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 anti-slip plate. The chair seat as described in claim 7, wherein the embedding hole and the mounting hole are separated by a supporting beam, and the first engaging edge is supported on the supporting beam, and the width of the first engaging edge is greater than the width of the supporting beam, and the width of the second engaging edge interfering with the base is less than the width of the anti-slip plate. The chair seat as described in claim 8, wherein the anti-slip plate has an anti-pullout structure, and the anti-pullout structure is engaged with the supporting beam.

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