A height-adaptable and adjustable classroom chair

Abstract

The present invention relates to a chair, and in particular to a chair that can be adjusted to suit a height. The purpose of the present invention is to provide a chair that can be adjusted to suit a height, which can adjust the height of a backboard. The present invention provides such a chair that can be adjusted to suit a height, which includes a standing foot, a cushion, a lifting rod, a first guide rod, etc. Two first guide rods are provided inside the standing feet on the left and right sides, a lifting rod is slidably provided between the first guide rods, the lifting rod is slidably connected to the two standing feet, there is damping between the lifting rod and the standing feet, and a cushion is provided on the top of the lifting rod for students to sit comfortably. The present invention can drive the second gear to rotate by pushing the front part of the pressing rod downward, thereby driving the fixed rack and the cushion to move upward, so as to achieve the purpose of raising the height of the cushion, and then push the connecting frame backward to drive the first clamping rod to move backward to release the limit rod, and then the students can move the backboard up and down to adjust the height, which is convenient for students to use.

Description

Technical Field

[0001] The invention relates to a classroom chair, in particular to a classroom chair that is adjustable according to body height. Background Art

[0002] The existing classroom chairs generally have simple functions, cannot be adjusted in height according to the needs of users, and have poor adaptability.

[0003] Patent application CN113558417A, published on 20211029, discloses a height-adjustable classroom chair, comprising a seat and two legs arranged at the bottom of the seat, the chair legs comprising a sleeve column and an adjustment column arranged in the sleeve column and capable of being raised and lowered relative to the sleeve column in the height direction, the adjustment column being fixed to the seat, and a locking assembly for locking the adjustment column being provided between the sleeve column and the adjustment column, the locking assembly comprising a mounting seat provided on the sleeve column and a limiting protrusion movably provided on the mounting seat, a sliding groove provided along the height direction of the adjustment column, and a plurality of limiting grooves spaced apart along the height direction of the sliding groove are provided on the side wall of the adjustment column; the classroom chair also comprises a driving component for simultaneously driving the limiting protrusions on the two legs to move synchronously horizontally. During the lifting and lowering process of the adjustment column, the limiting protrusion always moves relatively in the sliding groove without interfering with the limiting groove, so the adjustment column can be directly lifted and lowered to a predetermined height at one time. Although the above patent can adjust the height of the seat plate according to the needs of the user, it cannot adjust the height of the back plate. For people with taller heights, if the back plate is too low, it will be uncomfortable to sit on.

[0004] In summary, there is an urgent need for a height-adaptable and adjustable classroom chair capable of adjusting the height of the backboard to solve the above problems. Summary of the invention

[0005] In order to overcome the disadvantage that the existing height-adjustable classroom chairs can generally only adjust the seat height but not the back panel height, the purpose of the present invention is to provide a height-adjustable classroom chair capable of adjusting the back panel height.

[0006] The present invention is achieved through the following technical approaches: a height-adaptable adjustable classroom chair, comprising a standing foot, a seat cushion, a lifting rod, a first guide rod, a rotating frame, a rotating rod, a backboard, a limiting rod, an adjustment component, a fixing component and a contraction component, two first guide rods are provided inside the standing feet on the left and right sides, a lifting rod is slidably provided between the first guide rods, the lifting rod is slidably connected to the two standing feet, there is damping between the lifting rod and the standing feet, a seat cushion for students to sit comfortably is provided on the top of the lifting rod, a rotating rod is rotatably provided at the rear of the seat cushion, a rotating frame for providing students with a backrest is provided on the rotating rod, limiting rods are slidably provided on the left and right sides of the rotating frame, a backboard is provided between the upper parts of the limiting rods, an adjustment component for adjusting the height of the seat cushion is provided on the standing foot, a fixing component for limiting the lifting rod is provided on the upper part of the standing foot, and a contraction component for adjusting the height of the backboard is provided on the rotating frame.

[0007] Furthermore, the adjustment component includes a support shell, a pressing rod, an arc-shaped rack, a torsion spring, a first support block, a first rotating shaft, a first gear, a ratchet, a second support block, a second rotating shaft, a second guide rod, a first spring, a bevel gear, a second gear and a fixed rack. A support shell is arranged between the upper parts of the standing feet, the lifting rod is slidably connected to the support shell, a pressing rod is rotatably arranged in the middle part of the front side of the support shell, an arc-shaped rack is arranged on the rear side of the pressing rod, a torsion spring is arranged between the middle parts of the left and right sides of the pressing rod and the support shell, two first support blocks are arranged in the middle of the bottom of the support shell, a first rotating shaft is rotatably arranged between the upper parts of the two first support blocks, a first gear is arranged in the middle of the first rotating shaft, the arc-shaped rack will mesh with the first gear when it rotates, and the bottom of the support shell A second support block is provided on both sides of the left and right sides, a second rotating shaft is rotatably provided on the upper part of the second support block, a second guide rod is slidably provided on the inner side of the second rotating shaft, ratchets are provided between the inner sides of the second guide rods on the same side and on the left and right sides of the first rotating shaft, the number of ratchets is four, and two adjacent ratchets are meshed with each other, a first spring is wound around the second guide rod, and the two ends of the first spring are respectively connected to the second rotating shaft and the ratchet, a rotating rod is rotatably provided on the left and right sides of the lower inner side of the support shell, a bevel gear is provided on the front side of the rotating rod and the outer side of the second rotating shaft, the two adjacent bevel gears are meshed with each other, a second gear is provided on the rear side of the rotating rod, and fixed racks are provided on the left and right sides of the lifting rod, and the fixed racks are meshed with adjacent second gears.

[0008] Furthermore, the fixing assembly includes a third guide rod, a sliding frame, a second spring, a guide block, a pushing frame, a third spring, a first fixing block, a wedge rod, a fourth spring, a card block and a protective shell. Two third guide rods are symmetrically arranged at the middle of the front side of the support shell. The number of the third guide rods is four. A sliding frame is slidably arranged between the lower parts of the third guide rods. The pressing rod rotates to contact the sliding frame. The third guide rods are all wound with a second spring. The two ends of the second spring are respectively connected to the third guide rod and the sliding frame. The lower part of the front side of the support shell is symmetrically arranged with guide blocks. A pushing frame is slidably provided between the parts, the upper part of the pushing frame is slidably connected to the sliding frame, a third spring is symmetrically provided between the upper part of the pushing frame and the sliding frame, a first fixed block is provided on the inner upper part of the standing foot, a wedge rod is slidably provided in the middle part of the first fixed block, the pushing frame will contact the wedge rod when it moves upward, a fourth spring is provided between the wedge rod and the adjacent first fixed block, a clamping block is provided on the outer side of the wedge rod, the clamping block clamps the adjacent fixed racks, a protective shell is provided between the upper parts of the standing feet, the protective shell is located below the supporting shell, and the first fixed block and the wedge rod are both located inside the protective shell.

[0009] Furthermore, the retraction assembly includes a support frame, a fourth guide rod, a connecting frame, a sixth spring and a first clamping rod. A support frame is provided in the middle of the rear side of the rotating frame. Fourth guide rods are symmetrically provided on the left and right sides of the support frame. A connecting frame is slidably provided between the front sides of the fourth guide rods. Sixth springs are wound around the fourth guide rods. Both ends of the sixth spring are respectively connected to the support frame and the connecting frame. Three first clamping rods are spaced apart on the left and right sides of the front side of the connecting frame. The first clamping rods are slidably connected to the rotating frame, and the first clamping rods clamp adjacent limit rods.

[0010] Furthermore, it also includes a clamping assembly for limiting the wedge rod, the clamping assembly includes a second fixed block, a third gear, a third rotating shaft, a push rod, a fixed rod, a sliding rod and a fifth spring. Two second fixed blocks are provided in the middle of the front side of the bottom of the support shell, a third rotating shaft is rotatably provided between the lower parts of the second fixed blocks, a third gear is provided in the middle of the third rotating shaft, the arc-shaped rack is meshed with the third gear, the third gear is a one-way gear, push rods are provided on the left and right sides of the third rotating shaft, two fixed rods are provided on the left and right sides of the bottom of the support shell, a sliding rod is slidably provided between the two fixed rods on the same side, the push rod will contact the sliding rod when it rotates, the sliding rods are in contact with adjacent wedge rods, the lower part of the fixed rods is wound with a fifth spring, and the two ends of the fifth spring are respectively connected to the fixed rod and the sliding rod.

[0011] Furthermore, it also includes a limiting component for limiting the rotating frame, the limiting component includes a ratchet gear, a third fixed block, a second clamping rod, a seventh spring and a handle, ratchet gears are provided on the left and right sides of the rotating rod, and the third fixed blocks are symmetrically provided on the rear part of the seat cushion, and the second clamping rods are slidably provided on the third fixed blocks, and the second clamping rods clamp adjacent ratchet gears, and the seventh spring is provided between the second clamping rod and the adjacent third fixed block, and a handle is provided between the lower part of the second clamping rod.

[0012] Furthermore, it also includes a back pad assembly for improving comfort, the back pad assembly includes a fourth fixed block, a fifth guide rod, a cushion and an eighth spring, two fourth fixed blocks are provided on the left and right parts of the rotating frame, the fourth fixed blocks are slidably provided with a fifth guide rod, a cushion is provided between the front sides of the fifth guide rods, the fifth guide rods are wound with an eighth spring, and the two ends of the eighth spring are respectively connected to the fourth fixed blocks and the cushion.

[0013] Furthermore, circular holes are spaced apart on the limiting rods.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The present invention can drive the second gear to rotate by pushing the front part of the pressing rod downward, thereby driving the fixed rack and the seat cushion to move upward, so as to achieve the purpose of raising the height of the seat cushion. Then, the connecting frame is pushed backward to drive the first clamping rod to move backward to release the limit rod. Then, the students can move the backboard up and down to adjust the height, which is convenient for students to use.

[0016] 2. The slide bar of the present invention can block the inner side of the wedge-shaped bar, thereby preventing the block from moving inward and loosening the fixed rack due to the user's excessive weight.

[0017] 3. The present invention can limit the rotating frame through the cooperation of the ratchet gear and the second clamping rod, thereby preventing the rotating frame from moving randomly and improving the sitting comfort of students. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure from another viewing angle of the present invention.

[0020] Figure 3 It is a schematic diagram of the internal three-dimensional structure of the present invention.

[0021] Figure 4 It is a partial three-dimensional structural schematic diagram of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the regulating component of the present invention.

[0023] Figure 6 It is a partial structural schematic diagram of the regulating assembly of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the fixing assembly of the present invention.

[0025] Figure 8 It is a schematic diagram of the first partial structure of the fixing assembly of the present invention.

[0026] Fig. 9 It is a schematic diagram of the second partial structure of the fixing assembly of the present invention.

[0027] Fig.10 This is a schematic diagram of the third partial structure of the fixing assembly of the present invention.

[0028] Fig.11 It is a schematic structural diagram of the clamping assembly of the present invention.

[0029] Fig.12 It is a partial structural schematic diagram of the clamping assembly of the present invention.

[0030] Fig.13 It is a schematic structural diagram of the shrinking component of the present invention.

[0031] Fig.14 It is a structural schematic diagram of the limiting component of the present invention.

[0032] Fig.15 It is a schematic structural diagram of the back pad assembly of the present invention.

[0033] Among them: 1-standing foot, 2-seat cushion, 3-lifting rod, 4-first guide rod, 5-rotating frame, 6-rotating rod, 7-back plate, 8-limiting rod, 9-adjusting assembly, 901-support shell, 902-pressing rod, 903-arc rack, 904-torsion spring, 905-first support block, 906-first rotating shaft, 907-first gear, 908-ratchet, 909-second support block, 910-second rotating shaft, 911-second guide rod, 912-first spring, 913-bevel gear, 914-second gear, 915-fixed rack, 10-fixed assembly, 1001-third guide rod, 1002-sliding frame, 1003-second spring, 1004-guide block, 1005-pushing frame, 1006-third spring, 1007-first fixed block, 1 008-wedge rod, 1009-fourth spring, 1010-block, 1011-protective shell, 11-clamping assembly, 1101-second fixed block, 1102-third gear, 1103-third rotating shaft, 1104-push rod, 1105-fixed rod, 1106-sliding rod, 1107-fifth spring, 12-contraction assembly, 1201-support frame, 1202-fourth guide rod, 1203-connecting frame, 1204-sixth spring, 1205-first clamping rod, 13-limiting assembly, 1301-ratchet gear, 1302-third fixed block, 1303-second clamping rod, 1304-seventh spring, 1305-handle, 14-back pad assembly, 1401-fourth fixed block, 1402-fifth guide rod, 1403-pad, 1404-eighth spring. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with specific embodiments. It should also be noted that, unless otherwise clearly specified and limited, terms such as: setting, installing, connecting, and connecting should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1

[0036] A height-adjustable chair, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.13, including a standing foot 1, a cushion 2, a lifting rod 3, a first guide rod 4, a rotating frame 5, a rotating rod 6, a backboard 7, a limiting rod 8, an adjustment component 9, a fixing component 10 and a contraction component 12. Two first guide rods 4 are welded inside the standing feet 1 on the left and right sides. A lifting rod 3 is slidably provided between the first guide rods 4. The lifting rod 3 is slidably connected to the two standing feet 1. There is damping between the lifting rod 3 and the standing foot 1. A cushion 2 is provided on the top of the lifting rod 3. A rotating rod 6 is rotatably provided at the rear of the cushion 2. A rotating frame 5 is welded on the rotating rod 6. Students can sit on the cushion 2 to study, and can lean on the rotating frame 5 to rest when they are tired of studying. Limiting rods 8 are slidably provided on the left and right sides of the rotating frame 5. Round holes are spaced apart on the limiting rods 8. A backboard 7 is provided between the upper parts of the limiting rods 8. An adjustment component 9 is provided on the standing foot 1, a fixing component 10 is provided on the upper part of the standing foot 1, and a contraction component 12 is provided on the rotating frame 5.

[0037] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6The adjusting assembly 9 includes a supporting shell 901, a pressing rod 902, an arc-shaped rack 903, a torsion spring 904, a first supporting block 905, a first rotating shaft 906, a first gear 907, a ratchet 908, a second supporting block 909, a second rotating shaft 910, a second guide rod 911, a first spring 912, a bevel gear 913, a second gear 914 and a fixed rack 915. The supporting shell 901 is arranged between the upper part of the standing foot 1, the lifting rod 3 is slidably connected to the supporting shell 901, and the front middle part of the supporting shell 901 is rotatably arranged. There is a pressing rod 902, and an arc-shaped rack 903 is welded to the rear side of the pressing rod 902. Torsion springs 904 are arranged between the middle of the left and right sides of the pressing rod 902 and the support shell 901. Two first support blocks 905 are arranged in the middle of the bottom of the support shell 901. A first rotating shaft 906 is rotatably arranged between the upper parts of the two first support blocks 905. A first gear 907 is arranged in the middle of the first rotating shaft 906. The arc-shaped rack 903 rotates to mesh with the first gear 907. Second support blocks 905 are welded to the left and right sides of the bottom of the support shell 901. 09, the second support block 909 is rotatably provided with a second rotating shaft 910 on the upper part, and the second rotating shaft 910 is slidably provided with a second guide rod 911 at intervals inside. Ratchets 908 are provided between the inner sides of the second guide rods 911 on the same side and on the left and right sides of the first rotating shaft 906. The number of ratchets 908 is four, and two adjacent ratchets 908 are meshed with each other. The second guide rods 911 are wound with a first spring 912, and the two ends of the first spring 912 are respectively connected to the second rotating shaft 910 and the ratchet 908. The lower inner side of the support shell 901 There are rotatable rotating rods on both sides of the left and right parts, bevel gears 913 are provided on the front side of the rotating rod and the outer side of the second rotating shaft 910, the two adjacent bevel gears 913 are meshed with each other, and the rear side of the rotating rod is provided with a second gear 914, and fixed racks 915 are provided on the left and right sides of the lifting rod 3, and the fixed racks 915 are meshed with the adjacent second gears 914. Pushing the pressing rod 902 downward can drive the second gear 914 to rotate, thereby driving the fixed rack 915 and the seat cushion 2 to move upward, thereby increasing the height of the seat cushion 2.

[0038] Reference Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 , Fig. 9 and Fig.10, the fixing assembly 10 includes a third guide rod 1001, a sliding frame 1002, a second spring 1003, a guide block 1004, a pushing frame 1005, a third spring 1006, a first fixed block 1007, a wedge rod 1008, a fourth spring 1009, a block 1010 and a protective shell 1011, two third guide rods 1001 are welded symmetrically on the left and right middle of the front side of the support shell 901, the number of the third guide rods 1001 is four, a sliding frame 1002 is slidably arranged between the lower parts of the third guide rods 1001, the pressing rod 902 rotates and contacts with the sliding frame 1002, the second spring 1003 is wound around the third guide rod 1001, the two ends of the second spring 1003 are respectively connected to the third guide rod 1001 and the sliding frame 1002, the guide blocks 1004 are welded symmetrically on the left and right lower part of the front side of the support shell 901, and the guide blocks 1004 slide between the front parts. A dynamic push frame 1005 is provided, and the upper part of the push frame 1005 is slidably connected to the sliding frame 1002. A third spring 1006 is symmetrically provided between the upper part of the push frame 1005 and the sliding frame 1002. A first fixed block 1007 is provided on the inner upper part of the standing foot 1. A wedge rod 1008 is slidably provided in the middle part of the first fixed block 1007. The push frame 1005 will contact the wedge rod 1008 when it moves upward. A fourth spring 1009 is provided between the wedge rod 1008 and the adjacent first fixed block 1007. A clamping block 1010 is welded on the outer side of the wedge rod 1008. The clamping block 1010 clamps the adjacent fixed rack 915, so as to limit the seat cushion 2. A protective shell 1011 is provided between the upper part of the standing foot 1, and the protective shell 1011 is located below the supporting shell 901. The first fixed block 1007 and the wedge rod 1008 are both located inside the protective shell 1011.

[0039] Reference Figure 2 and Fig.13 The contraction assembly 12 includes a support frame 1201, a fourth guide rod 1202, a connecting frame 1203, a sixth spring 1204 and a first clamping rod 1205. The support frame 1201 is provided in the middle of the rear side of the rotating frame 5. The fourth guide rod 1202 is symmetrically welded on both sides of the support frame 1201. The connecting frame 1203 is slidably provided between the front sides of the fourth guide rod 1202. The fourth guide rod 1202 is wound with a sixth spring 1204. The sixth spring The two ends of 1204 are respectively connected to the support frame 1201 and the connecting frame 1203. Three first clamping rods 1205 are arranged on the left and right sides of the front side of the connecting frame 1203. The first clamping rods 1205 are slidably connected to the rotating frame 5. The first clamping rods 1205 clamp the adjacent limit rods 8. When the first clamping rods 1205 move backward, the limit rods 8 can be released. At this time, the students can move the back panel 7 up and down, driving the limit rods 8 to move up and down, so as to achieve the purpose of adjusting the height of the back panel 7.

[0040] When the student needs to use the chair, he can push the front part of the pressing rod 902 downward, so that the pressing rod 902 rotates, the torsion spring 904 is deformed, and the pressing rod 902 drives the arc-shaped rack 903 to move upward. When the pressing rod 902 contacts the sliding frame 1002, it drives the sliding frame 1002 to move upward, the second spring 1003 is compressed, and the sliding frame 1002 drives the third spring 1006 and the pushing frame 1005 to move upward. When the pushing frame 1005 contacts the wedge rod 1008, the wedge rod 1008 is squeezed to move inward, the fourth spring 1009 is stretched, and the wedge rod 1008 drives the block 1010 to move inward to release the fixed rack 915. When the pushing frame 1005 cannot move upward, the sliding frame 1002 Continuing to move upward, the third spring 1006 is compressed. When the arc-shaped rack 903 meshes with the first gear 907, the first gear 907 is driven to rotate, thereby driving the first rotating shaft 906 and the two ratchet wheels 908 on the inside to rotate, and then driving the two ratchet wheels 908 on the outside to rotate. The ratchet wheels 908 on the outside drive the second guide rod 911 and the second rotating shaft 910 to rotate. The second rotating shaft 910 is able to drive the rotating rod to rotate through the meshing of the bevel gear 913. The rotating rod drives the second gear 914 to rotate. The second gear 914 drives the fixed rack 915 to move upward, thereby driving the lifting rod 3 to move upward. The lifting rod 3 drives the seat cushion 2, the rotating rod 6, the rotating frame 5 and the back plate 7 to move upward. Then the pressing rod 902 is released, and the torsion spring 904 is restored. The pressing rod 902 is then driven to return to its original state, driving the pressing rod 902 to reverse and return to its original state, and the pressing rod 902 drives the arc-shaped rack 903 to move downward and return to its original state. At this time, the pressing rod 902 is separated from the sliding frame 1002, and the third spring 1006 is first restored to its original state, driving the sliding frame 1002 to move downward and return to its original state. At the same time, the arc-shaped rack 903 drives the first gear 907 to reverse, thereby driving the first rotating shaft 906 and the two ratchet wheels 908 on the inner side to reverse, thereby squeezing the two ratchet wheels 908 on the outer side to move outward, and the first spring 912 is compressed, and the two ratchet wheels 908 on the outer side do not rotate. When the arc-shaped rack 903 is separated from the first gear 907, the first spring 912 is restored to its original state, driving the two ratchet wheels 908 on the outer side to move inward and return to their original state, so that the two adjacent ratchet wheels 908 The third spring 1006 is fully restored to its original state, and the second spring 1003 is restored to its original state, driving the sliding frame 1002 to continue to move downward and reset. The sliding frame 1002 drives the third spring 1006 and the pushing frame 1005 to move downward and reset, so that the pushing frame 1005 is separated from the wedge rod 1008. The fourth spring 1009 is restored to its original state, driving the wedge rod 1008 and the block 1010 to move outward and reset, so that the block 1010 is stuck on the fixed rack 915, so as to fix the position of the lifting rod 3 and the seat cushion 2. Repeat the above operation to raise the height of the seat cushion 2 again. When the seat cushion 2 moves to a suitable height, stop pushing the pressing rod 902, and then press the connecting frame 1203 backward, and the sixth spring 1204 is compressed.The connecting frame 1203 drives the first clamping rod 1205 to move backward, so that the first clamping rod 1205 releases the limiting rod 8. At this time, the student can move the back plate 7 up and down, driving the limiting rod 8 to move up and down. When the back plate 7 moves to a suitable height, the connecting frame 1203 is released, and the sixth spring 1204 returns to its original state, driving the connecting frame 1203 and the first clamping rod 1205 to move forward and reset, so that the first clamping rod 1205 extends into different circular holes, thereby fixing the positions of the back plate 7 and the limiting rod 8. Then the student can sit on the cushion 2 to study, and can rest on the rotating frame 5 and the back plate 7 when tired of studying. The rear part of the cushion 2 can limit the rotating frame 5, and when the student needs to lower the height of the cushion 2, he pushes the front of the pressing rod 902 downward. The clamping block 1010 moves inward to release the fixed rack 915, and then the seat cushion 2 can be pressed downward, driving the lifting rod 3, the fixed rack 915, the rotating rod 6, the rotating frame 5 and the backboard 7 to move downward. When the seat cushion 2 moves to a suitable height, stop pressing the seat cushion 2 downward, and then release the pressing rod 902, so that the clamping block 1010 can move outward to reset and re-clamp the fixed rack 915. When the student needs to move the chair, the rotating frame 5 can be rotated forward to drive the backboard 7 to rotate forward so that the backboard 7 contacts the seat cushion 2, thereby facilitating the student to move the chair. When the chair is moved to the designated position, the rotating frame 5 is rotated backward to reset, driving the backboard 7 to rotate backward to reset, and then the chair can continue to be used.

[0041] Example 2

[0042] Based on Example 1, Figure 3 , Fig.11 and Fig.12 , also includes a clamping assembly 11, the clamping assembly 11 includes a second fixed block 1101, a third gear 1102, a third rotating shaft 1103, a push rod 1104, a fixed rod 1105, a sliding rod 1106 and a fifth spring 1107, two second fixed blocks 1101 are welded in the middle of the front side of the bottom of the support shell 901, a third rotating shaft 1103 is rotatably provided between the lower parts of the second fixed blocks 1101, a third gear 1102 is provided in the middle of the third rotating shaft 1103, the arc rack 903 is meshed with the third gear 1102, and the third gear 1102 is a one-way gear , push rods 1104 are provided on the left and right sides of the third rotating shaft 1103, and two fixed rods 1105 are welded on the left and right sides of the bottom of the supporting shell 901. A sliding rod 1106 is slidably provided between the two fixed rods 1105 on the same side. The push rod 1104 will contact the sliding rod 1106 when it rotates, and the sliding rods 1106 will contact the adjacent wedge rods 1008, so as to block the wedge rods 1008 and play a limiting role. The lower part of the fixed rod 1105 is wound with a fifth spring 1107, and the two ends of the fifth spring 1107 are respectively connected to the fixed rod 1105 and the sliding rod 1106.

[0043] When the pressing rod 902 rotates, the arc-shaped rack 903 moves upward, and the arc-shaped rack 903 drives the third gear 1102 to rotate, thereby driving the third rotating shaft 1103 and the push rod 1104 to rotate, and the push rod 1104 will squeeze the sliding rod 1106 to move backward, and the fifth spring 1107 is compressed, so that the sliding rod 1106 no longer blocks the inner side of the wedge rod 1008, and then the pressing rod 902 will contact the sliding frame 1002, thereby driving the wedge rod 1008 and the block 1010 to move inward, so that the block 1010 releases the fixed rack 915, and then the arc-shaped rack 903 will separate from the third gear 1102, at this time the wedge rod 1008 blocks the front side of the sliding rod 1106, and the sliding rod 1106 will not reset forward, and when the pressing rod 902 is reversed and reset, it drives the arc-shaped rack 903 moves downward to reset, and the pressing rod 902 will separate from the sliding frame 1002, thereby driving the wedge rod 1008 and the block 1010 to move outward to reset, so that the block 1010 re-jams the fixed rack 915. When the wedge rod 1008 is separated from the sliding rod 1106, the fifth spring 1107 returns to its original state, driving the sliding rod 1106 to move forward to reset, and the sliding rod 1106 squeezes the push rod 1104 to reverse and reset. When the arc-shaped rack 903 is re-engaged with the third gear 1102, it drives the third gear 1102 to reverse. At this time, the third gear 1102 does not drive the third rotating shaft 1103 to reverse, and the sliding rod 1106 blocks the inner side of the wedge rod 1008 again, thereby preventing the block 1010 from moving inward to loosen the fixed rack 915 due to the user being too heavy.

[0044] Reference Figure 1 , Figure 2 and Fig.14 , also includes a limiting component 13, the limiting component 13 includes a ratchet gear 1301, a third fixed block 1302, a second clamping rod 1303, a seventh spring 1304 and a handle 1305, ratchet gears 1301 are provided on the left and right sides of the rotating rod 6, and the third fixed block 1302 is symmetrically welded on the rear part of the seat cushion 2, and the third fixed block 1302 is slidably provided with a second clamping rod 1303, and the second clamping rod 1303 clamps the adjacent ratchet gear 1301, so as to limit the rotating rod 6 and the rotating frame 5, and a seventh spring 1304 is provided between the second clamping rod 1303 and the adjacent third fixed block 1302, and a handle 1305 is provided between the lower part of the second clamping rod 1303.

[0045] When the student needs to rotate the rotating frame 5 forward, he first pulls the handle 1305 downward to drive the second clamping rod 1303 to move downward, and the seventh spring 1304 is compressed, so that the second clamping rod 1303 releases the ratchet gear 1301, and then the rotating frame 5 can be rotated forward, driving the rotating rod 6 and the ratchet gear 1301 to rotate. At the same time, the rotating frame 5 drives the back plate 7 to rotate forward. When the back plate 7 contacts the cushion 2, the handle 1305 is released, and the seventh spring 1304 returns to its original state, driving the handle 1305 and the second clamping rod 1303 to move upward and reset, so that the second clamping rod 1303 re-jams the ratchet gear 1301, and then the student can carry the chair. When the chair is moved to the designated position, the rotating frame 5 is rotated backward and reset, and the rotating frame 5 drives the back plate 7 to rotate backward and reset, so that the back plate 7 contacts the cushion 2. At the same time, the rotating frame 5 drives the rotating rod 6 and the ratchet gear 1301 to reverse, and the ratchet gear 1301 will squeeze the second clamping rod 1303 to move downward, and the seventh spring 1304 is compressed. When the rotating frame 5 is completely reset, the seventh spring 1304 returns to its original state, driving the second clamping rod 1303 to move upward and reset, so that the second clamping rod 1303 re-jams the ratchet gear 1301, thereby limiting the rotating frame 5, preventing the rotating frame 5 from rotating at will, and improving the sitting comfort of students.

[0046] Reference Figure 1 , Figure 2 , Figure 3 and Fig.15 , also includes a back pad assembly 14, the back pad assembly 14 includes a fourth fixed block 1401, a fifth guide rod 1402, a cushion 1403 and an eighth spring 1404, two fourth fixed blocks 1401 are welded to the left and right parts of the rotating frame 5, the fourth fixed blocks 1401 are slidably provided with fifth guide rods 1402, and cushions 1403 are provided between the front sides of the fifth guide rods 1402. When students lean on the rotating frame 5 and the backboard 7 to rest, the students' backs will lean against the cushions 1403 to improve comfort, and the fifth guide rods 1402 are wound with eighth springs 1404, and the two ends of the eighth spring 1404 are respectively connected to the fourth fixed blocks 1401 and the cushions 1403.

[0047] When a student rests on the rotating frame 5 and the backboard 7, the student's back will squeeze the cushion 1403 to move backward, driving the fifth guide rod 1402 to move backward, the eighth spring 1404 is compressed, and the cushion 1403 is relatively soft, which can make the student more comfortable when resting. When the student's back is away from the cushion 1403, the eighth spring 1404 returns to its original state, driving the fifth guide rod 1402 and the cushion 1403 to move forward and reset.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A height-adaptable classroom chair, comprising a standing foot (1), a seat cushion (2), a lifting rod (3), a first guide rod (4), a rotating frame (5), a rotating rod (6), a backboard (7) and a limit rod (8), wherein two first guide rods (4) are provided inside the standing feet (1) on the left and right sides, a lifting rod (3) is slidably provided between the first guide rods (4), the lifting rod (3) is slidably connected to the two standing feet (1), there is damping between the lifting rod (3) and the standing feet (1), a seat cushion (2) for students to sit comfortably is provided on the top of the lifting rod (3), a rotating rod (6) is rotatably provided at the rear of the seat cushion (2), a rotating frame (5) for providing a backrest for students is provided on the rotating rod (6), limit rods (8) are slidably provided on the left and right sides of the rotating frame (5), a backboard (7) is provided between the upper parts of the limit rods (8), and the characteristic is that It also includes an adjustment component (9), a fixing component (10) and a retracting component (12); the standing foot (1) is provided with an adjustment component (9) for adjusting the height of the seat cushion (2); the upper part of the standing foot (1) is provided with a fixing component (10) for limiting the position of the lifting rod (3); and the rotating frame (5) is provided with a retracting component (12) for adjusting the height of the backboard (7); The adjustment assembly (9) comprises a support shell (901), a pressing rod (902), an arc-shaped rack (903), a torsion spring (904), a first support block (905), a first rotating shaft (906), a first gear (907), a ratchet (908), a second support block (909), a second rotating shaft (910), a second guide rod (911), a first spring (912), a bevel gear (913), a second gear (914) and a fixed rack (915). The support shell (901) is arranged between the upper part of the standing foot (1), and the lifting rod (3) and the support shell (901) are connected to each other. 01) Sliding connection, a pressing rod (902) is rotatably provided in the middle of the front side of the support shell (901), an arc-shaped rack (903) is provided on the rear side of the pressing rod (902), torsion springs (904) are provided between the middle of the left and right sides of the pressing rod (902) and the support shell (901), two first support blocks (905) are provided in the middle of the bottom of the support shell (901), a first rotating shaft (906) is rotatably provided between the upper parts of the two first supporting blocks (905), a first gear (907) is provided in the middle of the first rotating shaft (906), and the arc-shaped rack (903) is rotatably provided. The first gear (907) is meshed with the first gear (907) when the first gear (906) is rotated. The left and right sides of the bottom of the support shell (901) are provided with second support blocks (909). The upper part of the second support blocks (909) is provided with a second rotating shaft (910) in a rotatable manner. The inner side of the second rotating shaft (910) is provided with a second guide rod (911) in a slidable manner at intervals. Ratchets (908) are provided between the inner sides of the second guide rods (911) on the same side and on the left and right sides of the first rotating shaft (906). The number of ratchet wheels (908) is four. Two adjacent ratchet wheels (908) mesh with each other. The second guide rods (911) are provided with a second guide rod (911) around the first rotating shaft (906). A first spring (912) is provided, and the two ends of the first spring (912) are respectively connected to the second rotating shaft (910) and the ratchet (908); rotating rods are rotatably provided on the left and right sides of the inner lower part of the support shell (901); a bevel gear (913) is provided on the front side of the rotating rod and the outer side of the second rotating shaft (910); two adjacent bevel gears (913) are meshed with each other; a second gear (914) is provided on the rear side of the rotating rod; and fixed racks (915) are provided on the left and right sides of the lifting rod (3); and the fixed racks (915) are meshed with the adjacent second gears (914); The support shell (901) comprises a third guide rod (1001), a sliding frame (1002), a second spring (1003), a guide block (1004), a pushing frame (1005), a third spring (1006), a first fixing block (1007), a wedge rod (1008), a fourth spring (1009), a clamping block (1010) and a protective shell (1011). Two third guide rods (1001) are symmetrically arranged at the middle of the front side of the support shell (901). The number of the third guide rods (1001) is The amount is four, a sliding frame (1002) is slidably provided between the lower part of the third guide rod (1001), and the pressing rod (902) will contact the sliding frame (1002) when it rotates. The third guide rod (1001) is wound with a second spring (1003), and the two ends of the second spring (1003) are respectively connected to the third guide rod (1001) and the sliding frame (1002). The lower part of the front side of the support shell (901) is symmetrically provided with a guide block (1004), and the front part of the guide block (1004) is A push frame (1005) is provided in a sliding manner between the upper part of the push frame (1005) and the sliding frame (1002), and a third spring (1006) is symmetrically provided between the upper part of the push frame (1005) and the sliding frame (1002). A first fixed block (1007) is provided on the inner upper part of the standing foot (1), and a wedge-shaped rod (1008) is slidably provided in the middle part of the first fixed block (1007). When the push frame (1005) moves upward, it will contact the wedge-shaped rod (1008), and the wedge-shaped rod (1008) is provided. A fourth spring (1009) is provided between the wedge-shaped rod (1008) and the adjacent first fixed block (1007), a clamping block (1010) is provided on the outer side of the wedge-shaped rod (1008), the clamping block (1010) clamps the adjacent fixed rack (915), a protective shell (1011) is provided between the upper parts of the standing feet (1), the protective shell (1011) is located below the supporting shell (901), and the first fixed block (1007) and the wedge-shaped rod (1008) are both located inside the protective shell (1011); The invention also includes a clamping assembly (11) for limiting the wedge rod (1008), the clamping assembly (11) including a second fixed block (1101), a third gear (1102), a third rotating shaft (1103), a push rod (1104), a fixed rod (1105), a sliding rod (1106) and a fifth spring (1107), two second fixed blocks (1101) are provided in the middle of the front side of the bottom of the support shell (901), a third rotating shaft (1103) is rotatably provided between the lower parts of the second fixed blocks (1101), a third gear (1102) is provided in the middle of the third rotating shaft (1103), and the arc-shaped rack (903) and the third gear (1104) are connected to each other. 02) is meshed, the third gear (1102) is a one-way gear, push rods (1104) are provided on both sides of the third rotating shaft (1103), two fixed rods (1105) are provided on both sides of the bottom of the supporting shell (901), a sliding rod (1106) is slidably provided between the two fixed rods (1105) on the same side, the push rod (1104) will contact the sliding rod (1106) when it rotates, and the sliding rods (1106) are in contact with adjacent wedge-shaped rods (1008), and the lower part of the fixed rod (1105) is wound with a fifth spring (1107), and the two ends of the fifth spring (1107) are respectively connected to the fixed rod (1105) and the sliding rod (1106).

2. A height-adjustable chair according to claim 1, characterized in that: The retracting assembly (12) comprises a support frame (1201), a fourth guide rod (1202), a connecting frame (1203), a sixth spring (1204) and a first clamping rod (1205). The support frame (1201) is provided at the middle of the rear side of the rotating frame (5). The fourth guide rods (1202) are symmetrically provided on the left and right sides of the support frame (1201). The connecting frame (1203) is slidably provided between the front sides of the fourth guide rods (1202). The sixth spring (1204) is wound around the fourth guide rods (1202). The two ends of the sixth spring (1204) are respectively connected to the support frame (1201) and the connecting frame (1203). Three first clamping rods (1205) are spaced apart on the left and right sides of the front side of the connecting frame (1203). The first clamping rods (1205) are slidably connected to the rotating frame (5). The first clamping rods (1205) clamp adjacent limit rods (8).

3. The height-adjustable chair according to claim 2, characterized in that: The invention also comprises a limiting assembly (13) for limiting the position of the rotating frame (5), wherein the limiting assembly (13) comprises a ratchet gear (1301), a third fixing block (1302), a second clamping rod (1303), a seventh spring (1304) and a handle (1305), ratchet gears (1301) are arranged on the left and right sides of the rotating rod (6), a third fixing block (1302) is symmetrically arranged on the rear part of the seat cushion (2), a second clamping rod (1303) is slidably arranged on the third fixing block (1302), the second clamping rod (1303) clamps the adjacent ratchet gear (1301), a seventh spring (1304) is arranged between the second clamping rod (1303) and the adjacent third fixing block (1302), and a handle (1305) is arranged between the lower part of the second clamping rod (1303).

4. The height-adjustable chair according to claim 3, characterized in that: The invention also comprises a back cushion assembly (14) for improving comfort, the back cushion assembly (14) comprising a fourth fixing block (1401), a fifth guide rod (1402), a cushion (1403) and an eighth spring (1404), the left and right parts of the rotating frame (5) are each provided with two fourth fixing blocks (1401), the fifth guide rod (1402) is slidably provided on the fourth fixing blocks (1401), a cushion (1403) is provided between the front sides of the fifth guide rod (1402), the eighth spring (1404) is wound around the fifth guide rod (1402), and the two ends of the eighth spring (1404) are respectively connected to the fourth fixing blocks (1401) and the cushion (1403).

5. The height-adaptable and adjustable classroom chair according to claim 1, characterized in that: The limiting rods (8) are provided with circular holes at intervals.

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