A student chair base and a chair using it

Abstract

This utility model relates to school desks and chairs in the furniture field, specifically a student chair base and a chair using the same. Existing student chairs have complex structures and numerous parts, making assembly time-consuming, slow, and inefficient. This utility model provides a student chair base and a chair using the same. The student chair base includes several support legs for connecting the chair legs. The top of each support leg extends upward to form a chair leg mounting portion, which has upper insertion holes for inserting chair legs. All support legs are integrally formed into a single unit, constituting a single student chair base. The student chair base also includes multiple support legs and a surrounding wall connecting adjacent support legs, extending around the perimeter of the student chair base. The student chair base features integrally formed support legs and surrounding walls, resulting in strong support legs, stable placement, and eliminating the need for crossbars on the chair. This eliminates the risk of crossbars loosening and affecting the chair's stability, making the chair more robust and extending its lifespan. The simplified structure reduces the number of parts, allowing for faster and more efficient assembly.

Description

Technical Field

[0001] This utility model relates to school desks and chairs in the field of furniture, and in particular to a student chair base and a chair using the same. Background Technology

[0002] Most student chairs currently on the market, designed for primary and secondary school students, consist of four legs and a seat fixed to them. The legs are adjustable to change the height of the seat to suit individual student needs. The four legs either rest directly on the ground or are connected in two groups to two common support legs. Crossbars are needed between the legs or the common support legs to improve the overall stability of the chair. These crossbars require additional installation and are prone to loosening during use, affecting the overall stability of the chair. The overall structure of these student chairs is complex, with many parts, making assembly time-consuming, slow, and inefficient. Furthermore, some student chairs require additional storage baskets on the legs for backpacks or other items, further increasing the number of parts and the complexity of assembly. Utility Model Content

[0003] To address the technical problems of existing student chairs, such as complex overall structure, numerous parts, tedious assembly, slow speed, and low efficiency, this utility model provides a student chair base and a chair using the same. The student chair base integrates all common support legs into a single piece, with the support legs connected by a molded part of an integrated structure, enhancing the strength and stability of each support leg. The chair legs maintain a stable structure after being connected to the student chair base, and there is no need to add crossbars between the chair legs to improve structural strength. As a result, the structure of the student chair is simplified, the number of parts is reduced, and all chair legs are directly connected and locked to a common student chair base. There is no need to install crossbars between the chair legs, eliminating the need for crossbars and multiple locking parts at both ends. At the same time, there is no need to set up a special structure on the chair legs to connect the crossbars. The student chair structure is optimized, making assembly easier and faster, and improving efficiency.

[0004] The technical solution adopted by this utility model to solve the technical problem is: a student chair base, including a plurality of support feet for connecting chair legs, the top of the support feet extending upward to form a chair leg mounting part, the chair leg mounting part having an upper insertion hole for inserting the chair leg, characterized in that the support feet are integrally formed into a single structure, and the integral structure is formed into an integral student chair base, the student chair base including a plurality of support feet and a surrounding wall connecting two adjacent support feet, the surrounding wall extending around the perimeter of the student chair base. This utility model features an integrally formed support leg and surrounding wall on the base of a student chair. The surrounding wall extends around the perimeter of the student chair base between adjacent support legs, structurally reinforcing the support legs and improving their strength and stability on the ground. The student chair base connects to the chair legs through the upper insertion holes of the chair leg mounting part. The assembled student chair is stable and not easily tipped over. When used on a student chair, there is no need to add crossbars to the chair legs or support legs to improve stability, avoiding damage to the chair caused by the loosening or falling off of added crossbars during subsequent use, effectively extending the service life of the chair. At the same time, the student chair assembled with this base has a simplified structure, fewer parts, and is quicker and more convenient to assemble, resulting in high speed and efficiency.

[0005] As a further improvement and supplement to the above technical solution, this utility model adopts the following technical measures: The student chair base also includes a bottom wall located inside the enclosure. The bottom wall is connected to the bottom of the enclosure along its perimeter to form a storage basket for placing items. The bottom wall and the enclosure respectively form the bottom and side surfaces of the storage basket. The student chair base also integrates a storage basket with an integral structure, eliminating the need for separate design and additional parts for assembling and fixing the storage basket. The storage basket consists of the enclosure and the bottom wall connected to it, and can hold students' personal items such as school bags and water bottles. Items can be placed from the front and back sides of the storage basket; the perimeter of the bottom wall is connected to the enclosure, which can further enhance the strength of the enclosure.

[0006] The bottom wall has through grooves and / or through holes. The through grooves and through holes can serve as ventilation holes or drainage holes in the bottom wall, allowing items placed in the storage basket to breathe. When items such as water glasses are tilted and liquid spills out, it can flow out through the through grooves, preventing liquid from accumulating in the storage basket and soaking the items. The bottom wall may have only through grooves or only through holes, or both through grooves and through holes may exist simultaneously.

[0007] The student chair base has two walls at opposite ends, one higher than the other. The higher wall forms the rear wall of the storage basket, and the lower wall forms the front wall. The front wall and the support legs on both sides form the opening for placing and removing items from the storage basket. Items placed in the basket can be placed against the rear wall to prevent them from tipping over due to excessive height.

[0008] The support leg has a replaceable foot pad on its bottom surface. The foot pad includes a pad protruding outward from the support leg and a vertical wall inserted into the support leg. The vertical wall is integrally formed with the pad and extends parallel to the edge of the pad. The pad protrudes from the vertical wall around its edge. The foot pad is inserted into a lower insertion hole on the bottom surface of the support leg through the vertical wall. The shape and size of the lower insertion hole match the shape and size of the vertical wall. When the foot pad is inserted into the support leg, the edge of the pad abuts against the end face of the lower insertion hole. Student chairs are often dragged by students. The foot pad can prevent the support leg from directly contacting the ground, thus avoiding wear and tear on the support leg and the ground, reducing noise, and increasing friction with the ground, making the support leg more stable. The foot pad can be replaced when it is severely worn. When installing the foot pad, the vertical wall is inserted into the lower insertion hole, and the part of the pad protruding from the vertical wall abuts against the end face of the lower insertion hole, ensuring the foot pad is properly inserted. During production, the vertical wall and the lower insertion hole can be tightly fitted.

[0009] The vertical wall has multiple notches along its length. These notches allow the vertical wall on the foot pad to twist and deform, facilitating insertion into the lower insertion hole on the bottom of the support foot.

[0010] The support leg has a hollow cylindrical tube inside the lower insertion hole, with an opening on the bottom surface of the tube connecting to the cavity. The foot pad has a through mounting hole on the inner surface of the vertical wall. The foot pad can be locked and fixed to the bottom surface of the support leg by inserting a screw through the mounting hole and screwing it into the hollow cylindrical tube. The bottom surface of the foot pad has a first countersunk hole that matches the cap end of the screw. The foot pad is further fixed to the bottom surface of the support leg by inserting a screw. After the foot pad and the support leg are inserted into place, the screw passes through the foot pad and is screwed into the cylindrical tube inside the support leg, so that the foot pad and the support leg are connected and locked, and at the same time, the cap end of the screw is located in the first countersunk hole.

[0011] The outer end of the opening on the bottom surface of the column tube is enlarged to form a second countersunk hole. A vertical tube seat is installed around the mounting hole on the inner surface of the foot pad, mates with the second countersunk hole. When the foot pad and support leg are connected, the tube seat is inserted and abuts against the second countersunk hole. The tube seat and the second countersunk hole provide a limiting effect on the connection between the foot pad and support leg, guiding the screw through the tube seat and into the column tube. After the screw is tightened, the tube seat presses firmly against the second countersunk hole, preventing the screw from loosening.

[0012] The second objective of this invention is to provide a chair, comprising a seat, multiple vertically arranged chair legs, and matching support feet. The upper and lower ends of the chair legs are respectively connected to the seat and the support feet. The support feet are, as described above, a student chair base. The lower ends of the chair legs are inserted into upper insertion holes in the chair leg mounting portion. The chair legs have at least two vertically arranged and through-hole adjustment holes. The chair leg mounting portion has at least one fixing hole penetrating the side wall of the upper insertion hole. By moving the chair legs up and down, the height of the seat can be adjusted by selecting different positions of the adjustment holes and fixing holes to lock them in place. The chair legs and the chair leg mounting portion are securely connected by through bolts and locking nuts. Using the aforementioned student chair base, all chair legs are inserted and locked onto the one-piece molded base. There is no need for additional connecting structures or crossbars between the chair legs for structural reinforcement. The assembled student chair is stable and not easily tipped over. The overall structure of the student chair is simplified, the number of mounting parts is significantly reduced, and assembly is faster, faster, and more efficient. After removing the bolts and nuts, the chair legs can be raised and lowered relative to the chair leg mounting part to adjust the seat height. Select the appropriate adjustment holes and fixing holes, align them, screw in the bolts and tighten the nuts to lock the chair legs and chair leg mounting part, and the seat height will be locked. Multiple adjustment holes can be used to adjust the docking length between the chair legs and the upper insertion hole, thereby adjusting the seat height to suit the student's height and usage habits and improve user comfort.

[0013] The cross-sectional shapes of the chair legs and the upper insertion hole are matched, and a guide rail structure is formed between the chair legs and the upper insertion hole through vertically extending concave-convex joints. The chair legs move vertically into and out of the upper insertion hole through the guide rail structure. The matching of the cross-sectional shapes of the chair legs and the upper insertion hole, along with the corresponding guide rail formed by the vertically extending concave-convex joints, limits the smooth lifting and lowering movement of the chair legs relative to the upper insertion hole. The concave-convex matching can be that the protruding ribs on the side wall of the chair legs match the grooves on the inner wall of the upper insertion hole, or that the grooves on the side wall of the chair legs match the protruding ribs on the inner wall of the upper insertion hole, or that both the side wall of the chair legs and the inner wall of the upper insertion hole have protruding ribs and grooves for matching.

[0014] The beneficial technical effects of this utility model are as follows: The support legs and the surrounding walls are integrally formed on the student chair base, with the surrounding walls extending around the perimeter of the base to structurally reinforce the support legs, improving their strength and stability. The assembled student chair is stable and not easily tipped over, eliminating the need for additional crossbars on the chair legs or support legs to improve stability. This effectively prevents crossbars from loosening or falling off during subsequent use, affecting the overall structural stability of the chair and extending its service life. The chair structure using this base is simplified, with fewer parts, and assembly is fast and efficient. The student chair base also integrates an integral storage basket, eliminating the need for a separate connecting structure or additional parts to assemble and fix the storage basket. The bottom wall of the storage basket also has ventilation and drainage holes. The bottom of the support legs is equipped with replaceable foot pads, effectively preventing wear on the support legs while protecting the ground and reducing noise generated by dragging the chair. Attached Figure Description

[0015] Figure 1 Example 1: Structural diagram.

[0016] Figure 2 : Schematic diagram of the bottom surface of Example 1.

[0017] Figure 3 Cross-sectional view of Example 1.

[0018] Figure 4 : Structural schematic diagram of Example 2.

[0019] Figure 5 Exploded view of the structure of Example 2.

[0020] Figure 6 : Figure 5 Enlarged view of part A.

[0021] Figure 7 Example 2: Schematic diagram of the chair leg structure.

[0022] Figure 8 Example 2: Cross-sectional view of the chair legs and support feet assembly.

[0023] Figure 9 : Figure 8 Enlarged view of part B.

[0024] In the diagram: 1. Support leg, 1-2. Chair leg mounting part, 1-3. Column tube, 1-4. Second countersunk hole, 2. Upper insertion hole, 3. Enclosure wall, 4. Bottom wall, 4-1. Through groove, 4-2. Through hole, 5. Storage basket, 6. Foot pad, 6-1. Gasket, 6-2. Vertical wall, 6-3. Mounting hole, 6-4. First countersunk hole, 6-5. Tube seat, 6-6. Texture, 7. Lower insertion hole, 8. Notch, 9. Chair leg, 10. Adjustment hole, 11. Fixing hole, 12. Bolt, 13. Nut, 14. Inner groove, 15. Inner rib, 16. Outer rib, 17. Outer groove, 18. Seat panel, 18-1. Mounting base, 19. Break, 20. Reinforcing rib. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1-3As shown, Embodiment 1 is a student chair base, including four support legs 1 for connecting the chair legs. The four support legs are divided into two symmetrical groups, each group having two support legs. The top of each support leg 1 extends upward and bends to form a chair leg mounting part 1-2. The chair leg mounting part 1-2 has an upper insertion hole 2 for inserting the chair leg. In this embodiment, the four support legs 1 are integrally formed into the integral student chair base of this embodiment. In addition to the four support legs 1, the student chair base includes a surrounding wall 3 connecting two adjacent support legs 1. As shown in the figure, the surrounding wall 3 extends around the perimeter of the student chair base and closes. The student chair base in this embodiment is manufactured by injection molding.

[0027] The student chair base is integrally injection molded to form the support legs and walls. The walls extend around the perimeter of the base between adjacent support legs, reinforcing the support legs and improving their strength and stability on the ground. The student chair base can be assembled with the legs and seat board through the upper insertion holes of the leg mounting part. The assembled student chair is stable and not easy to tip over. There is no need to add crossbars to the legs or support legs to improve stability, preventing crossbars from loosening or falling off during subsequent use and affecting the overall stability of the chair structure. This effectively extends the service life of the chair. The student chair assembled using this base has a simplified structure, fewer parts, faster assembly speed, and higher production efficiency.

[0028] Furthermore, as shown in the figure, the student chair base also includes a bottom wall 4 located inside the enclosure 3. The bottom wall 4 is connected to the bottom of the enclosure 3 around its perimeter to form a storage basket 5 for placing items. The bottom wall 4 and the enclosure 3 are respectively formed as the bottom and side surfaces of the storage basket 5. The bottom wall 4 has a through groove 4-1 and / or a through hole 4-2. In this embodiment, the through groove 4-1 and the through hole 4-2 exist simultaneously. The lower surface of the bottom wall 4 is also integrally formed with an oil mesh-like reinforcing rib 20 to improve strength. The two enclosure walls 3 at the front and rear ends of the student chair base are of different heights. The front end corresponds to the side of the front of the chair when the student chair base is installed on the chair, and the rear end corresponds to the side of the back of the chair. The higher enclosure wall 3 forms the rear wall of the storage basket 51, and the lower enclosure wall 3 forms the front wall of the storage basket 5. The front wall and the support legs 1 on both sides form the item access opening of the storage basket 5.

[0029] The storage basket and the student chair base are integrated into one structure, or they can be injection molded, eliminating the need for separate design and additional parts to assemble the storage basket. Students' personal items, such as backpacks and water bottles, can be placed into the storage basket from the front and back sides, preferably through the item access opening on the lower side of the enclosure. The bottom edge is connected to the enclosure, which can further enhance the strength of the enclosure.

[0030] Furthermore, the support foot 1 has a replaceable foot pad 6 on its bottom surface. The foot pad 6 includes a pad 6-1 protruding outward from the support foot 1 and a vertical wall 6-2 inserted into the support foot 1. The vertical wall 6-2 is erected on the surface of the pad 6-1 and integrally formed with it. The vertical wall 6-2 extends on the surface of the pad 6-1 in a direction parallel to the edge of the pad 6-1. The vertical wall 6-2 has multiple notches 8 and a break 19 along its length. The pad 6-1 protrudes from the vertical wall 6-2 around its edge. The foot pad 6 is inserted into the lower insertion hole 7 provided on the bottom surface of the support foot 1 through the vertical wall 6-2 and is connected to the support foot 1. The shape and size of the lower insertion hole 7 match the shape and size of the vertical wall 6-2. When the foot pad 6 is connected to the support foot 1, the edge of the pad 6-1 abuts against the end face of the lower insertion hole 7. To further secure the foot pad 6 to the bottom surface of the support leg 1, the support leg 1 has a hollow column tube 1-3 inside the lower insertion hole 7. The column tube can be formed together during the injection molding production of the student chair base. The bottom surface of the column tube 1-3 has an opening that connects to the hollow tube cavity. The foot pad 6 has a through mounting hole 6-3 on the inner surface of the vertical wall 6-2. The foot pad 6 is locked to the bottom surface of the support leg 1 by inserting a screw through the mounting hole 6-3 and screwing it into the hollow column tube 1-3. The bottom surface of the foot pad 6 has a first countersunk hole 6-4 that matches the cap end of the screw to hide the cap end and prevent the cap end from protruding from the foot pad.

[0031] When installing the foot pad, insert it into the lower insertion hole through the upright side. The part of the pad protruding from the upright side abuts against the end face of the lower insertion hole, ensuring the foot pad is properly inserted. During production, the upright side and the lower insertion hole can be tightly fitted. The foot pad increases the friction with the ground, making the support leg more stable on the ground. It also prevents wear caused by the support leg directly contacting the ground, protects the floor, and reduces noise from the chair being moved. When the foot pad is severely worn, the screws can be unscrewed for replacement.

[0032] Furthermore, the outer end of the opening on the bottom surface of the column tube 1-3 is enlarged to form a second countersunk hole 1-4. The foot pad 6 has an upright tube seat arranged around the mounting hole 6-3 on the inner surface of the vertical wall 6-2, which mates with the second countersunk hole 1-4. When the foot pad 6 and the support leg 1 are connected, the tube seat is inserted and abuts against the second countersunk hole 1-4. When installing the foot pad, the tube seat and the second countersunk hole are engaged, limiting and guiding the connection between the foot pad and the support leg. The screw can smoothly pass through the tube seat and be screwed into the column tube for tightening. After the screw is tightened, the tube seat presses against the second countersunk hole, further preventing the screw from loosening.

[0033] like Figures 4-9As shown, Embodiment 2 is a chair, including a seat plate 18, four vertically arranged chair legs 9, and four supporting feet 1 matching the chair legs 9. The upper and lower ends of the chair legs 9 are respectively connected to the seat plate 18 and the corresponding supporting feet 1. The four chair legs 9 are divided into two groups, and the upper ends of the two groups of chair legs are respectively inserted into mounting seats 18-1 provided on both sides of the bottom of the seat plate 18. The mounting seats have insertion holes that match the ends of the chair legs. The supporting feet 1 are the student chair bases described in Embodiment 1. The lower ends of the chair legs 9 are inserted into the upper insertion holes 2 of the chair leg mounting parts 1-2. The chair leg 9 is provided with at least two vertically arranged and through adjustment holes 10, and the chair leg mounting part 1-2 is provided with at least one fixing hole 11 that passes through the side wall of the upper insertion hole 2. By moving the chair leg 9 up and down, the height of the seat plate 18 can be adjusted by selecting the adjustment holes 10 at different positions to cooperate with and lock the fixing holes 11. The chair leg 9 and the chair leg mounting part 1-2 are fastened together by the through bolt 12 and the locking nut 13. In the embodiment, the chair leg 9 has five adjustment holes 10, and the chair leg mounting part 1-2 has two upper and two lower fixing holes 11.

[0034] like Figure 6 and Figure 7 As shown, the chair leg 9 is a tubular profile, the cross-section of which matches the cross-sectional shape of the upper insertion hole 2. A guide rail structure is formed between the chair leg 9 and the upper insertion hole 2 through vertically extending concave-convex matching. The chair leg 9 moves vertically into and out of the upper insertion hole 2 via this guide rail structure. In this embodiment, the guide rail structure includes an inner groove 14 and an inner protruding rib 15 on the inner wall of the upper insertion hole 2, and an outer protruding rib 16 and an outer groove 17 on the side wall of the chair leg 9. When the chair leg 9 and the upper insertion hole 2 are connected, the outer protruding rib 16 and the outer groove 17 on the side wall of the chair leg 9 match the inner groove 14 and the inner protruding rib 15 on the inner wall of the upper insertion hole 2, respectively, guiding the chair leg 9 to move vertically into and out of the upper insertion hole 2 to adjust the depth of the chair leg 9 inserted into the upper insertion hole 2. The adjusting hole 10 and the fixing hole 11 are aligned at appropriate positions. Figure 5 As shown, bolt 12 is passed through chair leg 9 and chair leg mounting part 1-2, and then nut 13 is used to tighten the bolt 12 at the protruding end, thereby locking and fixing chair leg 9 and chair leg mounting part 1-2, and locking the height of seat plate 18. To increase the friction between the foot pad and the ground, such as... Figure 9 The bottom surface of the gasket 6-1 shown also has raised and recessed textures 6-6.

[0035] The chair uses the student chair base shown in Example 1, with all four legs inserted and locked onto the one-piece molded base. There's no need for additional connecting structures or crossbars between the legs for structural reinforcement, preventing crossbars from loosening or falling off during subsequent use and affecting the overall stability of the chair. The assembled student chair is stable, less prone to tipping, and has a long service life. Simultaneously, the simplified overall structure and fewer parts make assembly faster and more efficient. The seat height can be adjusted by raising and lowering the chair legs relative to the mounting points. After aligning the adjustment holes and fixing holes, screwing in the bolts and tightening the nuts locks the chair legs and mounting points, thus locking the seat height. Multiple adjustment holes can be used to adjust the docking length between the chair legs and the upper insertion holes, thereby adjusting the seat height to suit students' height and usage habits, improving comfort. To readjust the seat height, simply remove the bolts and nuts.

Claims

1. A student chair base, comprising a plurality of support legs (1) for connecting chair legs, the top of the support legs (1) extending upward to form a chair leg mounting portion (1-2), the chair leg mounting portion (1-2) having an upper insertion hole (2) for inserting a chair leg, characterized in that: The support leg (1) is an integrally formed structure, and the integral structure is formed into an integral student chair base. The student chair base includes multiple support legs (1) and a surrounding wall (3) connecting two adjacent support legs (1). The surrounding wall (3) extends around the perimeter of the student chair base.

2. The student chair base according to claim 1, characterized in that... The student chair base also includes a bottom wall (4) located inside the enclosure (3). The bottom wall (4) is connected to the bottom of the enclosure (3) along its perimeter to form a storage basket (5) for placing items. The bottom wall (4) and the enclosure (3) respectively form the bottom and side surfaces of the storage basket (5).

3. The student chair base according to claim 2, characterized in that... The bottom wall (4) has a through groove (4-1) and / or a through hole (4-2).

4. The student chair base according to claim 2, characterized in that... The two walls (3) at the front and rear ends of the student chair base are of different heights. The higher wall (3) forms the rear wall of the storage basket (5), and the lower wall (3) forms the front wall of the storage basket (5). The front wall and the supporting legs (1) on both sides form the opening for taking out and putting in items of the storage basket (5).

5. The student chair base according to claim 1, characterized in that... The support foot (1) has a replaceable foot pad (6) on its bottom surface. The foot pad (6) includes a pad (6-1) protruding outward from the support foot (1) and a vertical wall (6-2) inserted into the support foot (1). The vertical wall (6-2) is erected on the surface of the pad (6-1) and integrally formed therewith. The vertical wall (6-2) extends on the surface of the pad (6-1) in a direction parallel to the edge of the pad (6-1). The pad (6-1) protrudes from the vertical wall (6-2) around its edge. The foot pad (6) is inserted into the lower insertion hole (7) provided on the bottom surface of the support foot (1) through the vertical wall (6-2) and is connected to the support foot (1). The shape and size of the lower insertion hole (7) match the shape and size of the vertical wall (6-2). When the foot pad (6) is connected to the support foot (1), the edge of the pad (6-1) abuts against the end face of the lower insertion hole (7).

6. The student chair base according to claim 5, characterized in that... The vertical wall (6-2) has multiple notches (8) along its length.

7. The student chair base according to claim 5, characterized in that... The support foot (1) has a hollow column tube (1-3) inside the lower insertion hole (7). The bottom surface of the column tube (1-3) has an opening that connects to the cavity. The foot pad (6) has a through mounting hole (6-3) on the inner surface of the vertical wall (6-2). The foot pad (6) can be locked and fixed to the bottom surface of the support foot (1) by inserting a screw through the mounting hole (6-3) and screwing it into the hollow column tube (1-3). The bottom surface of the foot pad (6) has a first countersunk hole (6-4) that matches the cap end of the screw.

8. The student chair base according to claim 7, characterized in that... The outer end of the bottom opening of the column tube (1-3) is enlarged to form a second countersunk hole (1-4). The foot pad (6) has a vertical tube seat (6-5) arranged around the mounting hole (6-3) on the inner side of the vertical wall (6-2) to match the second countersunk hole (1-4). When the foot pad (6) and the support foot (1) are connected, the tube seat is inserted and abuts against the second countersunk hole (1-4).

9. A chair comprising a seat plate (18) and a plurality of vertically arranged chair legs (9) and support feet (1) matching the chair legs (9), wherein the upper and lower ends of the chair legs (9) are respectively connected to the seat plate (18) and the support feet (1), characterized in that... The support leg (1) is the student chair base as described in any one of claims 1 to 8. The lower end of the chair leg (9) is inserted into the upper insertion hole (2) of the chair leg mounting part (1-2). The chair leg (9) is provided with at least two vertically arranged and through adjustment holes (10). The chair leg mounting part (1-2) is provided with at least one through fixing hole (11) that passes through the side wall of the upper insertion hole (2). By moving the chair leg (9) up and down, the height of the seat board (18) can be adjusted by selecting the adjustment holes (10) at different positions to cooperate with and lock the fixing holes (11). The chair leg (9) and the chair leg mounting part (1-2) are fastened together by inserting bolts (12) and locking nuts (13).

10. The chair according to claim 9, characterized in that... The cross-section of the chair leg (9) matches the cross-section of the upper insertion hole (2), and the chair leg (9) and the upper insertion hole (2) form a guide rail structure through the vertically extending concave-convex matching. The chair leg (9) moves vertically into and out of the upper insertion hole (2) through the guide rail structure.

Images