Children's chair chassis adjustment mechanism

Abstract

The present invention provides a chassis adjustment mechanism of a children's chair, including a backrest fixing rod, a backrest adjustment assembly and a seat plate adjustment assembly. The backrest fixing rods are provided with two, and the backrest adjustment assembly includes a lead screw, which is rotatably installed between the two backrest fixing rods, and a first nut and a second nut are installed by a thread on the annular outer end of the lead screw. A slider is slidably installed between the two backrest fixing rods, and the lower end of the slider is rotatably connected to the first nut by a second connecting rod. The seat plate adjustment assembly includes two square guide rails respectively fixed to the right ends of the two backrest fixing rods, and a left toothed adjustment block and a right toothed adjustment block are respectively slidably installed on the opposite ends of the two square guide rails. The first movable rod and the second movable rod are respectively rotatably installed on the opposite ends of the two square guide rails, and the first movable rod and the second movable rod are fixedly connected by a limit rod. The present invention has a reasonable structure and is easy to adjust. It is suitable for children of multiple age groups and can be used for a long time.

Description

Technical Field

[0001] The invention relates to a chassis adjustment mechanism for a children's chair, belonging to the technical field of children's chairs. Background Art

[0002] Since children of different ages have different levels of development, there is no definite standard for child seats. Because there is no standard, if you want him (her) to have an ideal seat, you have to customize or purchase it according to the child's actual physiological conditions. As the child continues to grow, the previously customized or purchased seat will no longer be suitable for the child because of its small size, and re-customizing or purchasing it is also time-consuming and laborious. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a child chair chassis adjustment mechanism to solve the problem of short service life of child seats in the prior art. The present invention has a reasonable structure, is easy to adjust, is suitable for children of multiple age groups, and has a long service life.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a chassis adjustment mechanism of a child chair comprises a backrest fixing rod, a backrest fixing plate and a seat plate fixing plate, the backrest fixing rods are provided with two, the backrest fixing plate is fixedly connected to the two backrest fixing rods through a backrest adjustment assembly, the seat plate fixing plate is fixedly connected to the two backrest fixing rods through a seat plate adjustment assembly, the backrest fixing plate is arranged on the upper left side of the seat plate fixing plate, the backrest adjustment assembly comprises a lead screw, the lead screw is rotatably installed between the two backrest fixing rods, the annular outer end of the lead screw is threadedly installed with a first nut and a second nut, a slider is slidably installed between the two backrest fixing rods, the lower end of the slider is rotatably connected to the first nut through a second connecting rod, the lower end of the slider is rotatably connected to the second nut through the first connecting rod, and the slider The right end is fixed with a back plate fixing plate, and the seat plate adjustment assembly includes two square guide rails respectively fixed to the right ends of the two back plate fixing rods, and a left toothed adjustment block and a right toothed adjustment block are respectively slidably installed on the opposite ends of the two square guide rails, and the left toothed adjustment block and the right toothed adjustment block have the same structure, and the first movable rod and the second movable rod are respectively rotatably installed on the opposite ends of the two square guide rails, and the left position of the first movable rod and the second movable rod are fixedly connected by a limiting rod, and a torsion spring fixing rod is fixed at the opposite ends of the two square guide rails, and the first torsion spring and the second torsion spring are respectively mounted on the two torsion spring fixing rods, and the movable ends of the first torsion spring and the second torsion spring are both arranged at the lower end of the limiting rod, and a gas rod fixing tube is fixed at the lower end of the seat plate fixing plate, and the gas rod fixing tube is installed between the two square guide rails.

[0005] Furthermore, the screw extends from the front end of the back plate fixing rod on the front side and the front end of the screw is fixed to the adjustment handle, the rear end of the screw is connected to the back plate fixing rod on the rear side through a first bearing, and the screw is connected to the front side back plate fixing rod through a second bearing, and the front end of the front back plate fixing rod is fixed to the bearing end cover and the bearing end cover is mounted on the annular outer end of the screw.

[0006] Furthermore, the upper end of the first nut is connected to the second connecting rod through a second rivet, the upper end of the second nut is connected to the first connecting rod through a second rivet, a groove is provided at the lower end of the slider, the second connecting rod and the first connecting rod both extend into the groove, and the slider is respectively connected to the second connecting rod and the first connecting rod through the first rivet.

[0007] Furthermore, sliding grooves are provided at opposite ends of the two support plate fixing rods, and the front and rear ends of the sliding blocks extend into the two sliding grooves respectively.

[0008] Furthermore, a fixed shaft is fixed to one opposite end of the two square guide rails, and the first movable rod and the second movable rod are respectively installed on the two fixed shafts through bearings.

[0009] Furthermore, an adjustment handle is fixed at the right position of the front end of the first movable rod, a shift slot is provided inside the front square guide rail, and the adjustment handle passes through the shift slot and extends to the front end of the front square guide rail.

[0010] Furthermore, a through slot and at least two fixed slots are provided inside the left toothed adjustment block, at least the fixed slots are arranged at the upper end of the through slot, the first torsion spring and the torsion spring fixing rod are arranged inside the through slot, and the limit rod is clamped inside one of the fixed slots.

[0011] Furthermore, the two square guide rails are symmetrically fixed at one end relative to each other, a slot is provided at one end of the left toothed adjustment block that fits the square guide rail and the two guide rails are cooperatively installed inside the slot, the first movable rod is arranged between the two guide rails, the second movable rod is arranged between the two guide rails, the first movable rod is arranged on the upper side of the first torsion spring, the second movable rod is arranged on the upper side of the second torsion spring, and the first torsion spring and the second torsion spring are arranged between the left toothed adjustment block and the right toothed adjustment block.

[0012] Furthermore, the front and rear ends of the gas rod fixing tube are fixedly connected to the left toothed adjustment block and the right toothed adjustment block respectively through connecting rods, the driving cylinder is fixed inside the gas rod fixing tube, and the seat plate fixing plate includes a lower box fixed to the upper end of the driving cylinder piston rod and an upper box installed on the upper end of the lower box, one end of the upper box is connected to the lower box through a hinge, and the other end of the upper box is connected to the lower box through a flat-mouth buckle, and a cotton pad is fixed to the upper end of the upper box.

[0013] Beneficial effects of the present invention: The chassis adjustment mechanism of the child chair of the present invention can

[0014] 1. By rotating the lead screw, the first nut and the second nut are driven to move toward or away from each other, thereby driving the slider to move upward or downward along the support plate fixing rod, so as to facilitate the adjustment of the height of the support plate fixing plate relative to the support plate fixing rod.

[0015] 2. Lock the position of the right toothed adjustment block and the left toothed adjustment block through the limit rod, push the adjustment handle upward, drive the first movable rod to rotate along the fixed axis, thereby drive the left end of the first movable rod and the limit rod connected to the left end of the first movable rod to move downward, and after the limit rod is moved out of the fixed groove in the left toothed adjustment block and the right toothed adjustment block, move the left toothed adjustment block and the right toothed adjustment block left and right, thereby drive the gas rod fixing tube and the seat plate fixing plate to move left and right, so as to adjust the left and right position of the seat plate fixing plate relative to the back plate fixing rod.

[0016] 3. The driving cylinder can drive the seat plate fixing plate to move up and down and adjust the upper and lower positions of the seat plate fixing plate. The piston rod of the driving cylinder is connected to the lower box by bolts. When the seat plate fixing plate and the gas rod fixing tube need to be disassembled, open the flat upper box and remove the bolts connecting the driving cylinder piston rod and the lower box to achieve disassembly, which is convenient for disassembly.

[0017] 4. The backrest adjustment assembly can be used to adjust the up and down position of the backrest fixing plate relative to the backrest fixing rod, and the seat adjustment assembly can be used to adjust the left and right position of the seat fixing plate relative to the backrest fixing rod, so that the present invention can form a variety of states and is suitable for children of different age groups, so that children can use the present invention during a longer growth stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 It is a schematic diagram of the chassis adjustment mechanism of the child chair of the present invention;

[0020] Figure 2 It is a schematic diagram of a backrest adjustment component in the chassis adjustment mechanism of a child chair of the present invention;

[0021] Figure 3 It is a transmission schematic diagram of the lead screw in the chassis adjustment mechanism of the child chair of the present invention;

[0022] Figure 4 It is a schematic diagram of the seat plate adjustment assembly in the chassis adjustment mechanism of the child chair of the present invention;

[0023] Figure 5 It is a schematic diagram of the partial structure of the seat plate adjustment component in the chassis adjustment mechanism of the child chair of the present invention;

[0024] Figure 6 It is a schematic diagram of a seat plate fixing plate in the chassis adjustment mechanism of a child chair of the present invention;

[0025] Figure 7 for Figure 6 sectional view of .

[0026] In the figure: 1-back plate fixing plate, 2-adjusting handle, 3-back plate fixing rod, 4-seat plate fixing plate, 5-adjusting handle, 6-gas rod fixing tube, 7-slider, 8-first rivet, 9-first connecting rod, 10-second connecting rod, 11-first nut, 12-second nut, 13-screw, 14-second rivet, 15-bearing end cover, 16-movable rod, 17-left toothed adjustment block, 18-limiting rod, 19-first torsion spring, 20-torsion spring fixing rod, 21-right toothed adjustment block, 22-second movable rod, 23-second torsion spring, 24-first bearing, 25-second bearing, 26-square guide rail, 27-fixed shaft, 41-lower box, 42-upper box, 43-cotton pad, 61-driving cylinder, 171-fixed groove, 172-through groove, 261-shift groove. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] See also Figure 1-Figure 7 The present invention provides a technical solution: a child chair chassis adjustment mechanism, including a backrest fixing rod 3, a backrest fixing plate 1 and a seat plate fixing plate 4, two backrest fixing rods 3 are provided, the backrest fixing plate 1 is fixedly connected to the two backrest fixing rods 3 through a backrest adjustment component, the backrest adjustment component can adjust the up and down position of the backrest fixing plate 1 relative to the backrest fixing rod 3, the seat plate fixing plate 4 is fixedly connected to the two backrest fixing rods 3 through the seat plate adjustment component, the seat plate adjustment component can adjust the left and right position of the seat plate fixing plate 4 relative to the backrest fixing rod 3, so that the present invention is suitable for children of various ages, the backrest fixing plate 1 is arranged on the upper left side of the seat plate fixing plate 4, the child sits on the upper end of the seat plate fixing plate 4 and leans on the backrest fixing plate 1.

[0029] Embodiment 1: The backrest adjustment assembly includes a lead screw 13, which is rotatably installed between the two backrest fixing rods 3. The first nut 11 and the second nut 12 are installed on the annular outer end of the lead screw 13 through a thread. A slider 7 is slidably installed between the two backrest fixing rods 3. The lower end of the slider 7 is rotatably connected to the first nut 11 through the second connecting rod 10, and the lower end of the slider 7 is rotatably connected to the second nut 12 through the first connecting rod 9. The right end of the slider 7 is fixed to the backrest fixing plate 1 by a bolt but not limited to the bolt. By rotating the lead screw 13, the first nut 11 and the second nut 12 are driven to move toward or away from each other, thereby driving the slider 7 to move upward or downward along the backrest fixing rod 3, so as to facilitate the adjustment of the height of the backrest fixing plate 1 relative to the backrest fixing rod 3.

[0030] The lead screw 13 extends from the front end of the back plate fixing rod 3 on the front side and the front end of the lead screw 13 fixes the adjusting handle 2. When a person rotates the adjusting handle 2, the lead screw 13 is driven to rotate. The rear end of the lead screw 13 is connected to the back plate fixing rod 3 on the rear side through the first bearing 24. The lead screw 13 is connected to the front back plate fixing rod 3 through the second bearing 25. The first bearing 24 and the first bearing 24 facilitate the rotational connection between the lead screw 13 and the two back plate fixing rods 3. The front end of the front back plate fixing rod 3 is fixed with the bearing end cover 15 and the bearing end cover 15 is mounted on the annular outer end of the lead screw 13. The bearing end cover 15 is convenient for protecting the second bearing 25.

[0031] The upper end of the first nut 11 is connected to the second connecting rod 10 through the second rivet 14, and the upper end of the second nut 12 is connected to the first connecting rod 9 through the second rivet 14. A groove is provided at the lower end of the slider 7, and the second connecting rod 10 and the first connecting rod 9 both extend into the groove. The slider 7 is connected to the second connecting rod 10 and the first connecting rod 9 respectively through the first rivet 8. The second rivet 14 enables the first nut 11 and the second nut 12 to rotate relative to the second connecting rod 10 and the first connecting rod 9, and the first rivet 8 enables the slider 7 to rotate relative to the second connecting rod 10.

[0032] Slide grooves are provided at opposite ends of the two support plate fixing rods 3 , and the front and rear ends of the sliding block 7 extend into the two slide grooves respectively, so that the slide grooves are convenient for guiding the upward and downward movement of the sliding block 7 .

[0033] Working principle of embodiment 1: personnel rotate the adjusting handle 2, and the rotation of the adjusting handle 2 drives the lead screw 13 to rotate. Since the lead screw 13 is respectively connected to the first nut 11 and the second nut 12 through threads, the rotation of the lead screw 13 drives the first nut 11 and the second nut 12 to move toward or away from each other, thereby driving the slider 7 to move upward or downward along the back plate fixing rod 3 through the first connecting rod 9 and the second connecting rod 10, so as to facilitate the adjustment of the height of the back plate fixing plate 1 relative to the back plate fixing rod 3.

[0034] Embodiment 2: The seat plate adjustment assembly includes two square guide rails 26 respectively fixed to the right ends of the two back plate fixing rods 3, and the left toothed adjustment block 17 and the right toothed adjustment block 21 are respectively slidably installed on the opposite ends of the two square guide rails 26. The left toothed adjustment block 17 and the right toothed adjustment block 21 have the same structure. The two square guide rails 26 support the left toothed adjustment block 17 and the right toothed adjustment block 21 to facilitate the left and right movement of the square guide rails 26 and the second movable rod 22. The first movable rod 16 and the second movable rod 22 are respectively rotatably installed at the opposite ends of the two square guide rails 26. The left position between the first movable rod 16 and the second movable rod 22 is fixedly connected by a limit rod 18. The opposite ends of the two square guide rails 26 are fixed with a torsion spring. The spring fixing rod 20 and the two torsion spring fixing rods 20 are respectively covered with a first torsion spring 19 and a second torsion spring 23. The movable ends of the first torsion spring 19 and the second torsion spring 23 are both arranged at the lower end of the limit rod 18. The lower end of the seat plate fixing plate 4 is fixed with a gas rod fixing tube 6. The gas rod fixing tube 6 is installed between two square guide rails 26. The first torsion spring 19 is supported by the torsion spring fixing rod 20. The first torsion spring 19 in a compressed state pushes the limit rod 18. The right toothed adjustment block 21 and the left toothed adjustment block 17 are locked in position by the limit rod 18. The limit rod 18 is moved downward to release the lock of the left toothed adjustment block 17 and the square guide rail 26. Then, the relative position of the left toothed adjustment block 17 at the upper end of the square guide rail 26 can be adjusted.

[0035] The two square guide rails 26 are fixed with fixed shafts 27 at opposite ends. The first movable rod 16 and the second movable rod 22 are respectively installed on the two fixed shafts 27 through bearings to facilitate the rotational connection between the first movable rod 16 and the second movable rod 22 and the square guide rails 26.

[0036] The adjusting handle 5 is fixed at the right front end of the first movable rod 16 , and a shifting groove 261 is provided inside the front square guide rail 26 . The adjusting handle 5 passes through the shifting groove 261 and extends to the front end of the front square guide rail 26 . The shifting groove 261 facilitates the up and down movement of the square guide rail 26 .

[0037] A through slot 172 and at least two fixed slots 171 are provided inside the left toothed adjustment block 17, at least the fixed slots 171 are arranged at the upper end of the through slot 172, the first torsion spring 19 and the torsion spring fixing rod 20 are arranged inside the through slot 172, the limiting rod 18 is clamped inside one of the fixed slots 171, and the first rivet 8 is clamped inside one of the fixed slots 171 to achieve locking of the fixed shaft 27 by using the first rivet 8.

[0038] The two square guide rails 26 are fixed symmetrically at opposite ends, a slot is opened at one end of the left toothed adjustment block 17 that fits the square guide rail 26, and the two guide rails are installed in the slot, the first movable rod 16 is arranged between the two guide rails, the second movable rod 22 is arranged between the two guide rails, the first movable rod 16 is arranged on the upper side of the first torsion spring 19, the second movable rod 22 is arranged on the upper side of the second torsion spring 23, the first torsion spring 19 and the second torsion spring 23 are arranged between the left toothed adjustment block 17 and the right toothed adjustment block 21, the guide rail realizes the guiding function, and the space between the two guide rails is convenient for installing the first movable rod 16 and the second movable rod 22.

[0039] Working principle of embodiment 2: A person pushes the adjustment handle 5 upwards, driving the right end of the first movable rod 16 to move upwards. Since the first movable rod 16 is rotatably connected to the square guide rail 26 via the fixed shaft 27, the first movable rod 16 rotates along the fixed shaft 27 at the same time, thereby driving the left end of the first movable rod 16 and the limiting rod 18 connected to the left end of the first movable rod 16 to move downwards. The limiting rod 18 moves downwards to compress the first torsion spring 19 and the second torsion spring 23, so that the first torsion spring 19 and the second torsion spring 23 generate elastic force. When the limiting rod 18 moves from the left toothed adjustment block 17 and the right toothed adjustment block 2 1, keep the adjusting handle 5 in the pressed state, and then synchronously move the left toothed adjusting block 17 and the right toothed adjusting block 21 left and right, thereby driving the gas rod fixing tube 6 and the seat plate fixing plate 4 to move left and right. After moving to the appropriate position, release the adjusting handle 5, and the limiting rod 18 moves upward under the elastic force of the first torsion spring 19 and the second torsion spring 23, thereby driving the limiting rod 18 to move upward and move the limiting rod 18 to the corresponding fixing groove 171. At this time, the adjusting handle 5 moves downward to the initial position, so as to adjust the left and right position of the seat plate fixing plate 4 relative to the back plate fixing rod 3.

[0040] Embodiment 3: The front and rear ends of the gas rod fixing tube 6 are respectively fixedly connected to the left toothed adjustment block 17 and the right toothed adjustment block 21 through connecting rods, which facilitates the connection between the gas rod fixing tube 6 and the left toothed adjustment block 17 and the right toothed adjustment block 21. The driving cylinder 61 is fixed inside the gas rod fixing tube 6. The seat plate fixing plate 4 includes a lower box 41 fixed to the upper end of the piston rod of the driving cylinder 61 and an upper box 42 installed on the upper end of the lower box 41. One end of the upper box 42 is connected to the lower box 41 through a hinge, and the other end of the upper box 42 is connected to the lower box 41 through a flat-mouth buckle. A cotton pad is fixed to the upper end of the upper box 42. 43. The driving cylinder 61 can be set as an electric cylinder or a pneumatic cylinder, etc. The driving cylinder 61 can drive the seat plate fixing plate 4 to move up and down, and adjust the upper and lower positions of the seat plate fixing plate 4. The piston rod of the driving cylinder 61 is connected to the lower box 41 through bolts. When it is necessary to disassemble the seat plate fixing plate 4 and the pneumatic rod fixing tube 6, open the flat mouth buckle, and then rotate the upper box 42 around the hinge until the upper opening of the lower box 41 is exposed, and then release the bolts connecting the piston rod of the driving cylinder 61 and the lower box 41 to achieve disassembly. The disassembly is convenient, and the cotton pad 43 has the characteristics of softness, which improves the comfort of personnel.

[0041] In summary, the up-and-down position of the backrest fixing plate 1 relative to the backrest fixing rod 3 can be adjusted, and the left-and-right position and up-and-down position of the seat fixing plate 4 relative to the backrest fixing rod 3 can be adjusted, so that the present invention can form a variety of states, and different adjustment states are suitable for children of different age groups, so that children can use the present invention throughout a longer growth stage, without the need to purchase children's chairs of multiple sizes, thereby saving costs and reducing waste of resources.

[0042] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A child chair chassis adjustment mechanism, comprising a backrest fixing rod (3), a backrest fixing plate (1) and a seat fixing plate (4), Features: Two backrest fixing rods (3) are provided, the backrest fixing plate (1) is fixedly connected to the two backrest fixing rods (3) via a backrest adjustment assembly, the seat fixing plate (4) is fixedly connected to the two backrest fixing rods (3) via a seat adjustment assembly, and the backrest fixing plate (1) is provided on the upper left side of the seat fixing plate (4); The backrest adjustment assembly comprises a lead screw (13), the lead screw (13) is rotatably mounted between two backrest fixing rods (3), a first nut (11) and a second nut (12) are mounted on the annular outer end of the lead screw (13) via a thread, a slider (7) is slidably mounted between the two backrest fixing rods (3), the lower end of the slider (7) is rotatably connected to the first nut (11) via a second connecting rod (10), the lower end of the slider (7) is rotatably connected to the second nut (12) via a first connecting rod (9), and the right end of the slider (7) is fixed to the backrest fixing plate (1); The seat plate adjustment assembly comprises two square guide rails (26) respectively fixed at the right ends of the two back plate fixing rods (3); a left toothed adjustment block (17) and a right toothed adjustment block (21) are respectively slidably mounted on the opposite ends of the two square guide rails (26); the left toothed adjustment block (17) and the right toothed adjustment block (21) have the same structure; a first movable rod (16) and a second movable rod (22) are respectively rotatably mounted on the opposite ends of the two square guide rails (26); the first movable rod (16) and the second movable rod The left part of the two square guide rails (22) is fixedly connected by a limit rod (18), the torsion spring fixing rod (20) is fixed to the opposite end of the two square guide rails (26), and the first torsion spring (19) and the second torsion spring (23) are respectively mounted on the two torsion spring fixing rods (20), the movable ends of the first torsion spring (19) and the second torsion spring (23) are both arranged at the lower end of the limit rod (18), the lower end of the seat plate fixing plate (4) is fixed to the gas rod fixing tube (6), and the gas rod fixing tube (6) is installed between the two square guide rails (26); The front and rear ends of the gas rod fixing tube (6) are respectively fixedly connected to the left toothed adjustment block (17) and the right toothed adjustment block (21) through connecting rods; the driving cylinder (61) is fixed inside the gas rod fixing tube (6); the seat plate fixing plate (4) comprises a lower box (41) fixed to the upper end of the piston rod of the driving cylinder (61) and an upper box (42) installed on the upper end of the lower box (41); one end of the upper box (42) is connected to the lower box (41) through a hinge; the other end of the upper box (42) is connected to the lower box (41) through a flat-mouth buckle; a cotton pad (43) is fixed to the upper end of the upper box (42); the piston rod of the driving cylinder (61) is connected to the lower box (41) through bolts.

2. The child chair chassis adjustment mechanism according to claim 1, Features: The lead screw (13) extends from the front end of the back plate fixing rod (3) on the front side, and the front end of the lead screw (13) fixes the adjustment handle (2). The rear end of the lead screw (13) is connected to the back plate fixing rod (3) on the rear side through a first bearing (24). The lead screw (13) is connected to the front side back plate fixing rod (3) through a second bearing (25). The front end of the back plate fixing rod (3) on the front side is fixed with a bearing end cover (15), and the bearing end cover (15) is sleeved on the annular outer end of the lead screw (13).

3. The child chair chassis adjustment mechanism according to claim 1, Features: The upper end of the first nut (11) is connected to the second connecting rod (10) via a second rivet (14), and the upper end of the second nut (12) is connected to the first connecting rod (9) via a second rivet (14). A groove is provided at the lower end of the slider (7), and the second connecting rod (10) and the first connecting rod (9) both extend into the groove. The slider (7) is respectively connected to the second connecting rod (10) and the first connecting rod (9) via a first rivet (8).

4. The child chair chassis adjustment mechanism according to claim 1, Features: Two said back plate fixing rods (3) Slide grooves are provided at the opposite ends, and the front and rear ends of the slide block (7) extend into the two slide grooves respectively.

5. The child chair chassis adjustment mechanism according to claim 1, Features: A fixed shaft (27) is fixed to opposite ends of the two square guide rails (26), and the first movable rod (16) and the second movable rod (22) are respectively mounted on the two fixed shafts (27) via bearings.

6. The child chair chassis adjustment mechanism according to claim 1, Features: An adjustment handle (5) is fixed at the right front end of the first movable rod (16), a shifting groove (261) is provided inside the front square guide rail (26), and the adjustment handle (5) passes through the shifting groove (261) and extends to the front end of the front square guide rail (26).

7. The child chair chassis adjustment mechanism according to claim 1, Features: A through slot (172) and at least two fixed slots (171) are provided inside the left toothed adjustment block (17); at least the fixed slots (171) are arranged at the upper end of the through slot (172); the first torsion spring (19) and the torsion spring fixing rod (20) are arranged inside the through slot (172); and the limit rod (18) is clamped inside one of the fixed slots (171).

8. The child chair chassis adjustment mechanism according to claim 1, Features: The two square guide rails (26) are fixed symmetrically at opposite ends thereof, a slot is provided at one end of the left toothed adjustment block (17) that fits the square guide rail (26), and the two guide rails are mounted in the slot in a matching manner, the first movable rod (16) is arranged between the two guide rails, the second movable rod (22) is arranged between the two guide rails, the first movable rod (16) is arranged on the upper side of the first torsion spring (19), the second movable rod (22) is arranged on the upper side of the second torsion spring (23), and the first torsion spring (19) and the second torsion spring (23) are arranged between the left toothed adjustment block (17) and the right toothed adjustment block (21).

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