Chair seat and pressure device

Abstract

To provide a chair seat which allows a user to easily and quickly assemble armrests on both sides of the chair, whose package size is reduced and transportation cost is significantly reduced.SOLUTION: A chair seat is provided for combining with two armrests. Each armrest includes a crossbar. The chair seat includes a base and two clamping devices. The base includes at least one armrest slot and two mounting holes. The armrest slot is adapted for inserting the crossbar, and the mounting hole is in communication with the armrest slot. The two clamping devices are separately installed within the two mounting holes. Each clamping device includes a mounting base, a clamping element, an operating element, and a power transmission element. The clamping element is installed within an installation slot. The operating element is situated on an opposite side of the installation slot relative to the mounting base. The power transmission element connects the clamping element and the operating element. The operating element is suitable for driving the power transmission element, the power transmission element moves the clamping element toward the crossbar, thereby clamping the crossbar.SELECTED DRAWING: Figure 1B

Description

[Technical field]

[0001] The present invention relates to a chair seat, and more particularly to a chair seat equipped with a pressing part and an operating part. [Background technology]

[0002] Nowadays, the requirements of working and living environments are increasing day by day, and people are also making higher demands on office chairs. In addition to the flexibility, comfort and aesthetics of the chair, they also need adjustability to accommodate different users' heights, body types and usage methods. The design of office chairs with adjustable armrests was conceived to meet these needs. Summary of the Invention [Problem to be solved by the invention]

[0003] However, the disadvantages of this design method are obvious. First, it is difficult to assemble, and it is difficult for users who do not have a certain level of skill to assemble it by themselves. Second, this design requires many parts, which not only increases the difficulty of assembly but also increases the production cost. Finally, because it is difficult to assemble, it is not suitable for launching into the DIY furniture market.

[0004] Therefore, how to solve these problems and make the office chair with adjustable armrests have the advantages of efficiency, low cost, easy assembly, etc., is a matter for consideration by those skilled in the art. [Means for solving the problem]

[0005] The chair seat of the present invention is suitable for combining with two armrests, each armrest includes a crossbar. The chair seat includes a base and two pressing devices. The base includes at least one armrest insertion slot and two mounting holes, the armrest insertion slot is suitable for inserting the crossbar, and the mounting holes communicate with the armrest insertion slot.

[0006] Further, two pressing devices are mounted in the two mounting holes respectively, and each pressing device includes one mounting base, one pressing part, one operating part, and one power transmission member. The mounting base is mounted and fixed in the mounting holes, and a mounting groove is provided on one side. The pressing part is mounted in the mounting groove and faces the crossbar. The operating part is installed on the opposite side of the mounting base with respect to the mounting groove. The power transmission member is connected between the pressing part and the operating part. The operating part is arranged so that it moves the power transmission member, and the power transmission member moves the pressing part toward the crossbar and presses the crossbar.

[0007] In the above chair seat, the operating part is a swivel handle, the swivel handle has a central hole, and the power transmission part includes a mounting shaft and a finger pressure part. One end of the mounting shaft is mounted in the central hole, the finger pressure part is mounted on the opposite side of the mounting shaft and located in the mounting groove, the first ratchet part installed on one side of the mounting groove, and the finger pressure part presses the pressing part. The second ratchet part is installed at the bottom end of the mounting groove, and the second ratchet part is meshed with the first ratchet part. When the swivel handle is rotated in one direction, the mounting shaft moves the first ratchet part and the second ratchet part, and the finger pressure part moves the pressing part towards the crossbar and presses the crossbar.

[0008] In the seat of the chair, the acupressure part includes two first motion limiting parts, which are respectively arranged on both sides of the first ratchet part in a parallel symmetrical state, and the mounting groove includes two second motion limiting parts, which are respectively arranged on both sides of the second ratchet part in a parallel symmetrical state.

[0009] In the above chair seat, a crossbar groove is installed on the crossbar of the armrest, and an anti-pull part is installed on the mounting base, which interferes with one edge of the crossbar groove to prevent the crossbar from slipping out of the armrest insertion slot.

[0010] In the above chair seat, an anti-pull part is installed on the armrest crossbar and a card slot is installed on the mounting base, and the anti-pull part interferes with one edge of the card slot to prevent the crossbar from slipping out of the armrest insertion slot.

[0011] The seat of the chair includes two anti-slip plates, and an insertion hole is provided adjacent to each mounting hole of the base, the anti-slip plates are installed in the insertion hole, and a first and a second latching edge are provided on the opposite side of the mounting base, the mounting base is supported on the base through the first and the second latching edges, and the first latching edge is in contact with the anti-slip plates.

[0012] In the above chair seat, the insertion hole and the mounting hole are separated by a support shaft, the first interlocking edge is supported by the support shaft, the width of the first interlocking edge is greater than the width of the support shaft, and the width of the second interlocking edge that interferes with the base is smaller than the width of the anti-slip plate.

[0013] In the seat of the above chair, the anti-slip plate includes an anti-pull structure, and the anti-pull structure can be card-contacted to the support shaft.

[0014] In another embodiment of the present invention, the chair seat is suitable for coupling with two armrests, each armrest including a crossbar. The chair seat includes a base, two pressing devices, and two anti-slip plates. The base includes at least one armrest insertion slot and two mounting holes, the armrest insertion slot is suitable for inserting the crossbar, and the mounting holes communicate with the armrest insertion slot. An insertion hole is provided at an adjacent location of each mounting hole of the base. Furthermore, two pressing devices are mounted on the two mounting holes respectively, each pressing device includes a mounting base and a pressing part. The mounting base is mounted and fixed on the mounting hole, and a mounting groove is provided on one side. Also, a first mating edge and a second mating edge are respectively provided on the opposite side of the mounting base. The pressing part is mounted on the mounting groove and faces the crossbar. The anti-slip plate is mounted on the opposite side of the mounting base with respect to the mounting groove, and is mounted on the insertion hole. The mounting base is supported on the base through the first mating edge and the second mating edge, and the first mating edge contacts the anti-slip plate.

[0015] In the above chair seat, the insertion hole and the mounting hole are separated by a support shaft, the first interlocking edge is supported by the support shaft, the width of the first interlocking edge is greater than the width of the support shaft, and the width of the second interlocking edge that interferes with the base is smaller than the width of the anti-slip plate.

[0016] In the seat of the above chair, the anti-slip plate includes an anti-pull structure, and the anti-pull structure can be card-contacted to the support shaft.

[0017] In the above chair seat, a first tooth structure is installed on the crossbar, and a second tooth structure is installed on the pressing part, and when the pressing part presses the crossbar, the second tooth structure fits closely with the first tooth structure.

[0018] In the above chair seat, a crossbar groove is provided on the crossbar, the chair seat includes two first tooth-shaped structures, the first tooth-shaped structures are fitted into the crossbar groove, and a second tooth-shaped structure is provided on the pressing part, and when the pressing part presses the crossbar, the second tooth-shaped structures are closely fitted to the first tooth-shaped structures.

[0019] Another object of the present invention is to provide a pressing device that can be attached to an adjustable armrest seat, which assists users to quickly and conveniently assemble the armrest to the adjustable armrest seat.

[0020] The pressing device of the present invention is suitable for mounting on the mounting hole of the base of the adjustable armrest seat, and the pressing device includes a mounting base, a pressing part, a swivel handle, and a power transmission member. The mounting base is mounted and fixed on the mounting hole, and a mounting groove is provided on one side. The pressing part is mounted on the mounting groove.

[0021] In addition, the swivel handle is installed on the opposite side of the mounting base with respect to the mounting groove, and the swivel handle has a central hole. The power transmission member includes a mounting shaft and a finger pressure part, one end of the mounting shaft is installed in the central hole, the finger pressure part is installed on the opposite side of the mounting shaft, and is located in the mounting groove, and the first ratchet part is installed on one side of the mounting groove, and the finger pressure part presses the pressing part. The second ratchet part is installed at the bottom end of the mounting groove, and the second ratchet part is meshed with the first ratchet part. When the swivel handle is rotated in one direction, the mounting shaft moves the first ratchet part, and the first ratchet part and the second ratchet part move relatively to each other, so that the finger pressure part moves the pressing part up and down.

[0022] In the above pressing device, the finger pressure part includes two first motion limiting parts, which are respectively arranged on both sides of the first ratchet part in a parallel symmetrical state, and the mounting groove includes two second motion limiting parts, which are respectively arranged on both sides of the second ratchet part in a parallel symmetrical state.

[0023] In the above pressing device, the mounting base is equipped with an anti-pull part, and the anti-pull part is installed on the same side of the mounting base as the mounting groove.In addition, in the above pressing device, the mounting base is equipped with a card slot, and the card slot is installed on the same side of the mounting base as the mounting groove. Effect of the Invention

[0024] The object of the present invention is to provide an efficient, low-cost, easy-to-assemble chair seat, which has the advantages that users can easily and quickly assemble the armrests on both sides of the chair, reducing the package size and greatly reducing the shipping cost of the chair seat.

[0025] The preservation solution can also preserve the extracellular vesicles / exosomes in different storage environments, which can aid in the commercial development of the product.

[0026] According to the composition of the preservation solution, the present invention can be frozen and stored in a specific liquid or dry form as needed, allowing extracellular vesicles / exosomes to be preserved for a long time and maintain a certain reaction effect when thawed and reused, thereby assisting the research, development and application of the medical industry and improving time cost and commercial value. [Brief description of the drawings]

[0027] [Figure 1A] FIG. 1 is a schematic diagram of a chair seat 10 of the present embodiment. [Figure 1B] 1 is a schematic diagram of a chair seat 10 with two armrests 8 attached thereto. [Figure 1C] 1 is a schematic diagram of a mounting hole 122. FIG. [Diagram 2] FIG. 2 is a schematic diagram of an armrest 8. [Figure 3A] FIG. 2 is a schematic diagram of a pressing device 13. [Figure 3B] FIG. 2 is a schematic diagram of a pressing device 13. [Figure 3C] FIG. 13 is a schematic diagram of a mounting groove 131G. [Figure 3D] 13 is a schematic diagram of the pressing part 132 moving toward the crossbar 81. FIG. [Figure 3E] 2 is a schematic diagram of an armrest 8'. [Figure 3F] FIG. 2 is a schematic diagram of the mounting base 231. [Figure 4A] FIG. 13 is a schematic diagram showing a finger pressure component 1342 in a mounting groove 131G. [Figure 4B] 1 is a schematic diagram showing the positional relationship between a pressing part 132, an operating part 133, and a power transmission member 134. FIG. [Figure 4C] 1 is a schematic diagram showing a power transmission member 134 connected to an operating part 133. FIG. [Figure 4D] 1 is a schematic diagram of a power transmission member 134. FIG. [Figure 5A] 1 is a schematic view of a pressing device 13 and an anti-slip plate 14 from different angles. [Figure 5B] 1 is a schematic view of a pressing device 13 and an anti-slip plate 14 from different angles. [Figure 5C] 2 is a schematic diagram of the anti-slip plate 14. FIG. [Figure 5D] FIG. 1B is an enlarged view of part X in FIG. 1A. [Figure 6A] 2 is a schematic diagram of another embodiment of a chair seat 40. FIG. [Figure 6B] 13 is a schematic diagram showing the first tooth-shaped structure 45 being fitted into the crossbar groove 81G. [Figure 6C] 13 is a schematic diagram showing the first tooth-shaped structure 45 being fitted into the crossbar groove 81G. [Figure 6D] 4 is a schematic diagram of a pressing part 432. FIG. [Figure 6E] 1 is a schematic diagram showing a pressing part 432 contacting a first tooth-shaped structure 45. FIG. [Figure 7] 1 is a schematic diagram of a first tooth-shaped structure 45. FIG. [Figure 8A] FIG. 2 is a schematic diagram of an armrest 9. [Figure 8B] 1 is a schematic diagram showing a pressing part 432 contacting a first tooth-shaped structure 95. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Please refer to Figures 1A to 1C. Figure 1A is a schematic diagram of the chair seat 10 of this embodiment, Figure 1B is a schematic diagram of the chair seat 10 with two armrests 8, and Figure 1C is a schematic diagram of the mounting hole 122. The chair seat 10 of this embodiment includes one base 12 and two pressing devices 13. The base 12 includes two armrest insertion slots 121, two mounting holes 122, two insertion holes 123, and two support shafts 124, each mounting hole 122 communicates with one armrest insertion slot 121, and each mounting hole 122 is adjacent to one insertion hole 123. Each mounting hole 122 and the adjacent insertion hole 123 are separated by one support shaft 124. In this embodiment, the mounting holes 122 are located on the back of the base 12. However, in other embodiments, the mounting holes 122 may be located on the side of the base 12.

[0029] Please refer to Figure 1B and Figure 2. Figure 2 is a schematic diagram of an armrest 8. The chair seat 10 is suitable for combining with two armrests 8, and each armrest 8 includes one crossbar 81. A crossbar groove 81G is provided on the crossbar 81. In detail, one end of the crossbar 81 of the armrest 8 is inserted into the armrest insertion slot 121 of the base 12, the width of the crossbar groove 81G is the movable range of the armrest 8, and the crossbar 81 needs to be fixed by the pressing device 13. The method of fixing the position of the armrest 8 will be explained by an example in the following paragraph.

[0030] Please refer to Figure 3A to Figure 3D. Figure 3A and Figure 3B are schematic diagrams of the pressing device 13, Figure 3C is a schematic diagram of the mounting groove 131G, and Figure 3D is a schematic diagram of the pressing part 132 facing the crossbar 81. Two pressing devices 13 are respectively mounted in two mounting holes 122, and each pressing device 13 includes one mounting base 131, one pressing part 132, one operating part 133, and one power transmission member 134 (see Figure 5). The mounting base 131 is mounted and fixed in the mounting hole 122, and one side is provided with the mounting groove 131G and the anti-pull part 131P. The anti-pull part 131P is suitable for interfering with one edge 81E of the crossbar groove 81G of the crossbar 81. This can prevent the crossbar 81 from falling out of the armrest insertion slot 121.

[0031] In this embodiment, the mounting base 131 is provided with a pull-proof part 131P, and the crossbar 81 is provided with a crossbar groove 81G. However, in other embodiments, the installation positions of the pull-proof part 131P and the crossbar groove 81G can be reversed. For details, please refer to Figures 3E and 3F. The crossbar 81' of the armrest 8' is provided with a pull-proof part 81P, and the mounting base 231 is provided with a card slot 231G. The card slot 231G and the mounting groove 131G are provided on the same side of the mounting base 231. The pull-proof part 81P of the crossbar 81' is suitable to interfere with one end of the card slot 231G. This can prevent the crossbar 81' of the armrest 8' from falling out of the armrest insertion slot 121.

[0032] Furthermore, the operating part 133 is installed on the opposite side of the mounting base 131 with respect to the mounting groove 131G, that is, the operating part 133 is exposed to the outside of the base 12, which allows consumers to easily operate it. For example, the operating part 133 is a swivel handle, which has a central hole 133C. Also, the pressing part 132 is installed in the mounting groove 131G and faces the crossbar 81.

[0033] Please refer to Figures 4A to 4D. Figure 4A is a schematic diagram of the finger pressure part 1342 in the mounting groove 131G, Figure 4B is a schematic diagram showing the relative positions of the pressing part 132, the operating part 133, and the power transmission member 134, Figure 4C is a schematic diagram of the power transmission member 134 connected to the operating part 133, and Figure 4D is a schematic diagram of the power transmission member 134. In this embodiment, the power transmission member 134 is connected between the pressing part 132 and the operating part 133, and the power transmission member 134 includes one mounting shaft 1341 and one finger pressure part 1342. One end of the mounting shaft 1341 is mounted on the central hole 133C, and the finger pressure part 1342 is mounted on the opposite side of the mounting shaft 1341 and is located in the mounting groove 131G.

[0034] Furthermore, the finger pressure part 1342 presses the pressing part 132, and the finger pressure part 1342 includes one first ratchet part 1342R and two first movement limiting parts 1342L. The first ratchet part 1342R is located close to the side of the mounting groove 131G, and the two first movement limiting parts 1342L are respectively arranged on both sides of the first ratchet part 1342R and are parallel and symmetrical to each other.

[0035] Also, refer to FIG. 3C again. The mounting groove 131G includes one second ratchet component 131R, a through hole 131H, and two second motion limiting components 1312. The second ratchet component 131R is installed at the bottom end of the mounting groove 131G, the through hole 131H is located at the center of the second ratchet component 131R, the center of the through hole 131H and the center of the central hole 133C are on the same straight line, and the mounting shaft 1341 passes through the through hole 131H. That is, the second ratchet component 131R is located between the finger pressure component 1342 and the operating component 133.

[0036] And the second ratchet part 131R and the first ratchet part 1342R are meshed with each other. Specifically, when the swivel handle is in the open state, the highest part of the first ratchet part 1342R touches the lowest part of the second ratchet part 131R, and the highest part of the second ratchet part 131R also touches the lowest part of the first ratchet part 1342R, so that the two ratchet parts are meshed with each other. In this state, the position of the armrest 8 can be adjusted within a certain range, which is equal to the width of the crossbar groove 81G.

[0037] Furthermore, the two second movement limiting parts 1312 in the mounting groove 131G are located on both sides of the second ratchet part 131R, and are parallel and symmetrical to each other. When the second ratchet part 131R and the first ratchet part 1342R are engaged, the two first movement limiting parts 1342L and the two second movement limiting parts 1312 are arranged alternately. Therefore, the rotation range of the turning handle (operation part 133) is limited by the first movement limiting part 1342L and the second movement limiting part 1312.

[0038] In this embodiment, the operating part 133 moves the power transmission member 134, which moves the pressing part 132 toward the crossbar 81 and presses it against the crossbar 81. Specifically, after the turning handle is rotated in one direction (closed state), the mounting shaft 1341 moves the first ratchet part 1342R and the second ratchet part 131R relatively, so that the highest part of the first ratchet part 1342R touches the highest part of the second ratchet part 131R, and the finger pressure part 1342 moves the pressing part 132 toward the crossbar 81. In this way, the pressing part 132 fixes the crossbar 81, and generates a certain friction force between the surface of the pressing part 132 and the surface of the crossbar 81, making the crossbar 81 not easily moved by an external force. Conversely, when the swivel handle is rotated to its original position, the surface of the pressing part 132 moves away from the surface of the crossbar 81, thereby allowing the user to adjust the crossbar 81 of the armrest 8 within a certain range.

[0039] Please refer to Figure 5A to Figure 5D. Figure 5A and Figure 5B are schematic diagrams of the pressing device 13 and the anti-slip plate 14 from different angles, Figure 5C is a schematic diagram of the anti-slip plate 14, and Figure 5D is an enlarged view of the X part of Figure 1A. The chair seat 10 also includes two anti-slip plates 14, each of which is attached to one insertion hole 123. In this embodiment, the anti-slip plate 14 has an anti-pull structure 141, which is in card contact with the support shaft 124 of the base 12. Therefore, when the anti-slip plate 14 is placed in the insertion hole 123, the anti-pull structure 141 prevents the anti-slip plate 14 from falling out of the insertion hole 123. Furthermore, when an external force is pressed against the anti-pull structure 141, the anti-pull structure 141 is separated from the support shaft 124, and the anti-slip plate 14 can be removed from the insertion hole 123 without card contact.

[0040] Furthermore, the mounting base 131 has a first latching edge 131F and a second latching edge 131S on two opposing sides. The mounting base 131 is supported on the base 12 through the first latching edge 131F and the second latching edge 131S, and the first latching edge 131F contacts the anti-slip plate 14. Specifically, the width W1 (see FIG. 3A) of the first latching edge 131F is larger than the width W2 (see FIG. 5D) of the support shaft 124, and the contact width of the second latching edge 131S with the base 12 is smaller than the width W3 (see FIG. 5A) of the anti-slip plate 14, which is the total width W4 (see FIG. 5A) of the second latching edge 131S in this embodiment. Therefore, when the anti-slip plate 14 is not placed in the insertion hole 123, the mounting base 131 can be attached to the mounting hole 122, and the first latching edge 131F is supported on the lower surface of the support shaft 124. Thereafter, when the anti-slip plate 14 is placed in the insertion hole 123, the side of the first engaging edge 131F comes into contact with the anti-slip plate 14.

[0041] In addition, to remove the crossbar 81 of the armrest 8 from the base 12, the anti-slip plate 14 must first be removed from the insertion hole 123. After that, the mounting base 131 of the pressing device 13 can be moved toward the insertion hole 123 to separate the pressing device 13 from the base 12. Then, the crossbar groove 81G of the crossbar 81 is no longer blocked by the anti-pull part 131P of the pressing device 13, so that the crossbar 81 of the armrest 8 can be pulled out of the armrest insertion slot 121. Therefore, the chair seat 10 of this embodiment can easily assemble and remove the armrests 8 on both sides. This can reduce the size of the packaging box of the chair seat 10 and greatly reduce the transportation cost of the product.

[0042] Please refer to Figures 6A to 6E. Figure 6A is a schematic diagram of a chair seat 40 according to another embodiment, Figures 6B and 6C are schematic diagrams of the first tooth-shaped structure 45 being inserted into the crossbar groove 81G, Figure 6D is a schematic diagram of the pressing part 432, and Figure 6E is a schematic diagram of the pressing part 432 contacting the first tooth-shaped structure 45. The chair seat 40 is different from the chair seat 10 in that it includes two first tooth-shaped structures 45. The first tooth-shaped structures 45 include a plurality of first movement limiting bars 45L (see Figure 7) arranged closely together, and each of the first tooth-shaped structures 45 is inserted into the crossbar groove 81G.

[0043] In addition, the pressing part 432 of the chair seat 40 is provided with a second tooth-shaped structure 4320 arranged toward the first tooth-shaped structure 45. The second tooth-shaped structure 4320 includes a plurality of closely-spaced second motion limiting bars 4320L (see FIG. 6D ), each of which is parallel to each of the first motion limiting bars 45L. In this embodiment, when the power transmission member 134 moves the pressing part 432 toward the crossbar 81 and presses against the crossbar 81, the second tooth-shaped structure 4320 and the first tooth-shaped structure 45 are closely interlocked. Since the plurality of second motion limiting bars 4320L are arranged in parallel with the plurality of first motion limiting bars 45L, the interlocking is easy, and the position of the armrest 8 can be easily determined. This allows the user to easily adjust the distance between the left and right armrests 8.

[0044] In the above embodiment, the first tooth-shaped structure 45 of the chair seat 40 is fitted into the crossbar groove 81G of the crossbar 81. However, in other embodiments, the crossbar 81 and the first tooth-shaped structure 45 may be an integrated structure. That is, this embodiment does not have the technical characteristics of the crossbar groove 81G. For example, see Fig. 8A and Fig. 8B. The crossbar 91 of the armrest 9 is provided with the first tooth-shaped structure 95. In other words, the crossbar 91 and the first tooth-shaped structure 95 are an integrated structure. In addition, the technical characteristics of the first tooth-shaped structure 95 itself correspond to the technical characteristics of the first tooth-shaped structure 45. In this embodiment, when the power transmission member 134 moves the pressing part 432 toward the crossbar 91 and presses it against the crossbar 91, the second tooth-shaped structure 4320 and the first tooth-shaped structure 95 are closely meshed. In this way, the user can easily adjust the distance between the left and right armrests 9.

[0045] As described above, compared with the traditional adjustable armrest office chair, the chair seat 10 and the chair seat 40 of the present embodiment can fix the mounting base 131 without using other parts (such as screws) when assembling the armrest 8 and the pressing device 13, so that the user can easily assemble the armrests 8 on both sides by himself, and at the same time, the manufacturing cost is also reduced. [Explanation of symbols]

[0046] 8, 8', 9: Armrests 81, 81', 91: Crossbar 81G: Crossbar groove 81E: One edge of the crossbar groove 81P: Anti-slip part 10, 40: Chair seat 12: Bass 121: Armrest insertion slot 122: Mounting hole 123: Inset hole 124: Support shaft 13: Pressing device 131, 231: Mounting base 1312: Secondary motion limiting part 131R: Second ratchet part 131F: First mating edge 131S: Second snap edge 131P: Anti-slip part 131G: Mounting groove 131H:Through hole 132, 432: Pressing parts 133: Operation parts 133C: Center hole 134: Power transmission components 1341: Mounting shaft 1342: Shiatsu parts 1342R: First ratchet part 1342L: First motion limiting part 14: Anti-slip plate 141: Anti-slip structure 231G: Card slot 45, 95: First tooth shape structure 45L: First movement limit bar 4320: Second tooth shape structure 4320L: Secondary movement limit bar X: local range of base W1: Width of first mating edge W2: Width of the support shaft W3: Width of anti-slip plate W4: Overall width of second mating edge

Claims

1. 1. A chair seat having two armrests, each armrest including a crossbar, a base including at least one armrest insertion slot for inserting said crossbar therein and two mounting holes communicating with said armrest insertion slot; a pressing device attached to each of the two mounting holes, The pressing device is a mounting base that is attached and fixed to the mounting hole and has a mounting groove on one side; A pressing part mounted in the mounting groove and facing the crossbar; an operating member provided on the other side surface of the mounting base opposite to the mounting groove; a power transmission member connected between the pressing part and the operation member, The operating member drives the power transmission member to cause the power transmission member to move the pressing part toward the crossbar and tighten the crossbar; The operating part is a rotating handle having a central hole; The power transmission member includes a mounting shaft and a finger pressure part, one end of which is attached to the central hole, The finger pressure part is mounted on the opposite side of the mounting shaft, and is located in the mounting groove, and has a first ratchet part mounted on one side of the mounting groove, and presses the pressing part; A second ratchet member is disposed at the bottom end of the mounting groove, and the second ratchet member is engaged with the first ratchet member; When the swivel handle is rotated in one direction, the mounting shaft moves the first ratchet part, and the first ratchet part moves relative to the second ratchet part, causing the finger pressure part to move the pressing part toward the crossbar, thereby pressing the crossbar.

2. The seat of the chair as described in claim 1, wherein the finger pressure part further includes two first motion limiting parts, the two first motion limiting parts being respectively arranged on both sides of the first ratchet part and respectively in a parallel symmetrical state, and the mounting groove includes two second motion limiting parts, the two second motion limiting parts being respectively arranged on both sides of the second ratchet part and respectively in a parallel symmetrical state.

3. 2. The seat of a chair as described in claim 1, wherein a crossbar groove is provided on the crossbar of the armrest, and an anti-slip part is provided on the mounting base, and the anti-slip part prevents the crossbar from slipping out of the armrest insertion slot by contacting one edge of the crossbar groove.

4. 2. The seat of a chair as described in claim 1, wherein an anti-slip part is installed on the crossbar of the armrest, a card slot is installed on the mounting base, and the anti-slip part prevents the crossbar from slipping out of the armrest insertion slot by contacting one edge of the card slot.

5. 2. The seat of the chair according to claim 1, comprising two anti-slip plates, an insertion hole is provided at a location adjacent to each mounting hole of the base, the anti-slip plate is attached to the insertion hole, a first interlocking edge and a second interlocking edge are respectively provided on the opposite side of the mounting base, the mounting base is supported on the base through the first interlocking edge and the second interlocking edge, and the first interlocking edge contacts the anti-slip plate.

6. The seat of a chair as described in claim 5, wherein the insertion hole and the mounting hole are separated by a support shaft, the first interlocking edge is supported by the support shaft, the width of the first interlocking edge is greater than the width of the support shaft, and the width of the second interlocking edge interfering with the base is smaller than the width of the anti-slip plate.

7. 7. The chair seat of claim 6, wherein the anti-slip plate includes an anti-slip structure, the anti-slip structure card-contacting the support shaft.

8. A chair seat having two armrests, each armrest including a crossbar, a base including at least one armrest insertion slot and two mounting holes adapted for insertion of said crossbar, said mounting holes communicating with said armrest insertion slots, said base having a receiving hole disposed adjacent each mounting hole; Two pressing devices are respectively attached to the two mounting holes, and each pressing device is attached and fixed to a mounting base and the mounting holes, and has a mounting groove on one side, and a first mating edge and a second mating edge on the opposite side of the mounting base, respectively; a pressing part mounted in the mounting groove and facing the crossbar; two anti-slip plates installed on other sides of the mounting base relative to the mounting groove; The pressing part is suitable for pressing the crossbar, The anti-slip plate is attached to the insertion hole, The mounting base is supported on the base through the first and second mating edges, and the first mating edge contacts the anti-slip plate, the seat of the chair.

9. The seat of a chair as described in claim 8, wherein the insertion hole and the mounting hole are separated by a support shaft, the first interlocking edge is supported on the support shaft, the width of the first interlocking edge is greater than the width of the support shaft, and the width at which the second interlocking edge interferes with the base is smaller than the width of the anti-slip plate.

10. 10. The chair seat of claim 9, wherein the anti-slip plate includes an anti-slip structure, the anti-slip structure card-contacting the support shaft.

11. 9. The seat of a chair as described in claim 1 or claim 8, wherein a first tooth-shaped structure is provided on the crossbar and a second tooth-shaped structure is provided on the pressing part, and when the pressing part presses the crossbar, the second tooth-shaped structure fits closely with the first tooth-shaped structure.

12. The seat of the chair as claimed in claim 1 or claim 8, wherein the crossbar is provided with a crossbar groove, the seat of the chair includes two first tooth-shaped structures, the first tooth-shaped structures are fitted into the crossbar groove, and the pressing part is provided with a second tooth-shaped structure, and when the pressing part presses the crossbar, the second tooth-shaped structure fits closely with the first tooth-shaped structure.

13. 1. A pressing device for mounting to one mounting hole of one base of a chair of an adjustable armrest seat, comprising: a mounting base that is attached and fixed to the mounting hole and has a mounting groove on one side; A pressing part that is attached to the mounting groove; a rotating handle disposed on another side of the mounting base with respect to the mounting groove and having a center hole; a power transmission member including a mounting shaft and a finger pressure part; one end of the mounting shaft is mounted in the central hole, the finger pressure part is mounted on the opposite side of the mounting shaft, a first ratchet part is located in the mounting groove and installed on one side of the mounting groove, and the finger pressure part presses the pressing part; Including, A second ratchet member is disposed at the bottom end of the mounting groove, and the second ratchet member is engaged with the first ratchet member; When the swivel handle is rotated in one direction, the mounting shaft moves the first ratchet part, and the first ratchet part moves relative to the second ratchet part, causing the finger pressure part to move the pressing part up and down.

14. The pressing device of claim 13, wherein the finger pressure part further includes two first movement limiting parts, the two first movement limiting parts being respectively arranged on both sides of the first ratchet part and in a parallel symmetrical state; and the mounting groove includes two second movement limiting parts, the two second movement limiting parts being respectively arranged on both sides of the second ratchet part and in a parallel symmetrical state.

15. The pressing device according to claim 13, wherein the mounting base further includes an anti-pull part, the anti-pull part being disposed on the same side as the mounting groove and the mounting base.

16. The pressing device according to claim 13, wherein the mounting base further comprises a card slot, the card slot and the mounting groove being disposed on the same side of the mounting base.

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