CN114794773B

CN114794773B - A height-adaptable and adjustable classroom chair

Info

Publication number: CN114794773B
Application number: CN202210221516.3A
Authority: CN
Inventors: 杨荣山
Original assignee: Shandong Xingtan Science And Education Equipment Co ltd
Current assignee: Shandong Xingtan Science And Education Equipment Co ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2025-02-25
Anticipated expiration: 2042-03-09
Also published as: CN114794773A

Abstract

The invention relates to a tablet chair, in particular to a height-adaptive adjustable tablet chair. The invention aims to provide a height-adaptive adjustable tablet chair capable of adjusting the height of a backboard. The invention provides a height-adaptive adjustable tablet chair which comprises standing legs, a cushion, lifting rods, first guide rods and the like, wherein two first guide rods are arranged in the standing legs on the left side and the right side, the lifting rods are arranged between the first guide rods in a sliding mode, the lifting rods are connected with the two standing legs in a sliding mode, damping is arranged between the lifting rods and the standing legs, and the cushion used for enabling students to sit comfortably is arranged at the top of the lifting rods. According to the invention, the second gear can be driven to rotate by pushing the front part of the pressing rod downwards, so that the fixed rack and the seat cushion are driven to move upwards, the purpose of raising the height of the seat cushion is achieved, then the connecting frame is pushed backwards, the first clamping rod can be driven to move backwards to loosen the limiting rod, then the student can move the backboard up and down to adjust the height, and the use of the student is facilitated.

Description

Height-adaptive adjustable tablet chair

Technical Field

The invention relates to a tablet chair, in particular to a height-adaptive adjustable tablet chair.

Background

The existing tablet chairs are generally simple in function, cannot be adjusted in height according to the needs of users, and are poor in adaptability.

Patent application CN113558417A, publication day 20211029 discloses a height-adjustable tablet chair, including seat support and two landing legs of locating the seat support bottom, the chair leg includes the loop column and locates the adjusting column that can follow the direction of height and go up and down of relative loop column in the loop column, adjusting column is fixed with the seat support, just be equipped with the locking component who is used for locking adjusting the column between loop column and the adjusting column, locking component is including locating the mount pad on the loop column and the spacing arch of movably locating on the mount pad, be equipped with the sliding tray that sets up along adjusting column direction of height on the adjusting column lateral wall to and a plurality of spacing grooves along the spacing distribution of sliding tray direction of height, tablet chair still includes the drive part that is used for driving the spacing arch synchronous horizontal migration on two landing legs simultaneously. In the lifting process of the adjusting column, the limiting protrusion moves relatively in the sliding groove all the time and cannot interfere with the limiting groove, so that the adjusting column can be lifted to a preset height at one time directly. The above patent can adjust the height of the seat plate according to the needs of the user, but cannot adjust the height of the back plate, and if the back plate is too short for a person with a high height, the user is uncomfortable to sit on.

In view of the foregoing, there is a strong need for a height-adaptive adjustable tablet chair capable of adjusting the height of the backboard to solve the above-mentioned problems.

Disclosure of Invention

In order to overcome the defect that the prior height-adjustable tablet chair can only adjust the height of a seat board but cannot adjust the height of a back board, the invention aims to provide the height-adaptive adjustable tablet chair capable of adjusting the height of the back board.

The height-adaptive adjustable tablet chair comprises standing legs, a cushion, lifting rods, first guide rods, rotating frames, rotating rods, back plates, limiting rods, adjusting assemblies, fixing assemblies and contraction assemblies, wherein the two first guide rods are arranged in the standing legs on the left side and the right side, the lifting rods are slidably arranged between the first guide rods, the lifting rods are slidably connected with the two standing legs, damping is arranged between the lifting rods and the standing legs, the top of each lifting rod is provided with a cushion for enabling students to sit comfortably, the rear portion of each cushion is rotatably provided with a rotating rod, the rotating rods are provided with rotating frames for providing backs for the students, limiting rods are slidably arranged on the left side and the right side of the inside of each rotating frame, the back plates are arranged between the upper portions of the limiting rods, the adjusting assemblies for adjusting the heights of the sitting pads are arranged on the standing legs, the fixing assemblies for limiting the lifting rods are arranged on the upper portions of the standing legs, and the contraction assemblies for adjusting the heights of the back plates are arranged on the rotating frames.

Further, adjusting part is including supporting the shell, press the pole, the arc rack, torsion spring, first supporting shoe, first rotation axis, first gear, the ratchet, the second supporting shoe, the second rotation axis, the second guide bar, first spring, bevel gear, second gear and fixed rack, be equipped with the supporting shell between standing foot upper portion, the lifter is connected with the supporting shell slidingtype, the front side middle part rotation of supporting shell is equipped with the pressure pole, press the pole rear side and be equipped with the arc rack, all be equipped with torsion spring between the left and right sides middle part of pressure pole and the supporting shell, the centre of supporting shell inner bottom is equipped with two first supporting shoe, the rotation of arc rack can with first gear engagement, the left and right sides of supporting shell inner bottom all is equipped with the second supporting shoe, the second rotation axis is all equipped with to the second inner side of second guide bar, the left and right sides of the second guide bar inboard with the first rotation axis is equipped with the ratchet, the quantity of ratchet is the ratchet is all equipped with the first rotation axis, the ratchet is equipped with the adjacent bevel gear of two adjacent ratchet, both sides are equipped with the fixed gear and the right side, the equal rotation of the second rotation axis is equipped with the adjacent gear, the right side of two adjacent ratchet is equipped with the two side of the second guide bar, the equal rotation of ratchet is equipped with the second rotation, the both sides of the adjacent gear is equipped with the second rotation of second rotation on the second rotation axis, the inner side of the second support bottom is equipped with the second rotation.

Further, fixed subassembly is including third guide bar, the carriage, the second spring, the guide block, promote the frame, the third spring, first fixed block, the wedge pole, the fourth spring, fixture block and protecting crust, the front side middle part bilateral symmetry of supporting crust is equipped with two third guide bars, the quantity of third guide bar is four, sliding type is equipped with the carriage between the third guide bar lower part, press the pole rotation can with the carriage contact, all around there being the second spring on the third guide bar, the both ends of second spring are connected with third guide bar and carriage respectively, the front side lower part bilateral symmetry of supporting crust is equipped with the guide block, sliding type is equipped with the promotion frame between the guide block front portion, promote frame upper portion and sliding type to be connected with the carriage, bilateral symmetry is equipped with the third spring between promotion frame upper portion and the carriage, the inboard upper portion of standing foot all is equipped with first fixed block, the equal sliding type is equipped with the wedge pole in the middle part, the upward motion of promotion frame can be contacted with the wedge pole, all be equipped with the fourth spring between wedge pole and the adjacent first fixed block, the wedge pole outside all is equipped with the fixture block, it is equipped with the wedge block to block, all is located between the protecting crust and the protecting crust to lie in the inside protecting crust.

Further, shrink subassembly is including braced frame, fourth guide bar, link, sixth spring and first clamping bar, the rear side middle part of swivel mount is equipped with the braced frame, the equal bilateral symmetry in the inside left and right sides of braced frame is equipped with the fourth guide bar from top to bottom, sliding type is equipped with the link between the fourth guide bar front side, all around having the sixth spring on the fourth guide bar, the both ends of sixth spring are connected with braced frame and link respectively, the equal interval in the left and right sides of link front side is equipped with three first clamping bars, first clamping bar all is connected with the swivel mount is sliding type, adjacent gag lever post is all blocked to first clamping bar.

Further, still including being used for carrying out spacing chucking subassembly to wedge, chucking subassembly is including the second fixed block, the third gear, the third rotation axis, the push rod, the dead lever, slide bar and fifth spring, the front side middle part of supporting shell bottom is equipped with two second fixed blocks, the rotation is equipped with the third rotation axis between the second fixed block lower part, the third rotation axis middle part is equipped with the third gear, arc rack and third gear engagement, the third gear is the unidirectional gear, the left and right sides of third rotation axis all is equipped with the push rod, the left and right sides of supporting shell bottom all is equipped with two dead levers, all slidingtype be equipped with the slide bar between two dead levers of homonymy, the push rod rotates and can be contacted with the slide bar, the slide bar all contacts with adjacent wedge, the dead lever lower part all winds the fifth spring, the both ends of fifth spring are connected with dead lever and slide bar respectively.

Further, still including being used for carrying out spacing subassembly to rotating stand, spacing subassembly is including ratchet, third fixed block, second clamping lever, seventh spring and pull the handle, the left and right sides of rotary rod all is equipped with ratchet, the rear portion bilateral symmetry of cushion is equipped with the third fixed block, all slidingtype on the third fixed block is equipped with the second clamping lever, adjacent ratchet is all blocked to the second clamping lever, all be equipped with seventh spring between second clamping lever and the adjacent third fixed block, be equipped with the pull handle between the second clamping lever lower part.

Further, the back cushion assembly for improving comfort level is further arranged, the back cushion assembly comprises a fourth fixed block, a fifth guide rod, a cushion and an eighth spring, the left and right parts of the rotating frame are respectively provided with two fourth fixed blocks, the fourth fixed blocks are respectively provided with the fifth guide rod in a sliding mode, the cushion is arranged between the front sides of the fifth guide rods, the eighth spring is wound on the fifth guide rod, and two ends of the eighth spring are respectively connected with the fourth fixed blocks and the cushion.

Further, round holes are formed in the limiting rods at intervals.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the second gear can be driven to rotate by pushing the front part of the pressing rod downwards, so that the fixed rack and the seat cushion are driven to move upwards, the purpose of raising the height of the seat cushion is achieved, then the connecting frame is pushed backwards, the first clamping rod can be driven to move backwards to loosen the limiting rod, then the student can move the backboard up and down to adjust the height, and the use of the student is facilitated.

2. The sliding rod can block the inner side of the wedge-shaped rod, and the problem that the clamping block moves inwards to loosen the fixed rack due to the fact that the weight of a user is too heavy is avoided.

3. According to the invention, through the matching of the ratchet gear and the second clamping rod, the rotating frame can be limited, the random movement of the rotating frame is avoided, and the sitting comfort of students is improved.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of another perspective view of the present invention.

Fig. 3 is a schematic internal perspective view of the present invention.

Fig. 4 is a schematic view of a partial perspective structure of the present invention.

Fig. 5 is a schematic structural view of the adjusting assembly of the present invention.

FIG. 6 is a schematic view of a portion of the structure of the adjustment assembly of the present invention.

Fig. 7 is a schematic structural view of the fixing assembly of the present invention.

Fig. 8 is a schematic view of a first partial structure of the fixing assembly of the present invention.

Fig. 9 is a schematic view of a second partial structure of the fixing assembly of the present invention.

Fig. 10 is a schematic view of a third partial structure of the fixing assembly of the present invention.

Fig. 11 is a schematic view of the structure of the clamping assembly of the present invention.

Fig. 12 is a schematic view of a portion of the structure of the clamping assembly of the present invention.

FIG. 13 is a schematic view of the structure of the retraction assembly of the present invention.

Fig. 14 is a schematic structural view of a limiting assembly according to the present invention.

Fig. 15 is a schematic structural view of a back pad assembly according to the present invention.

Wherein: 1-standing leg, 2-seat cushion, 3-lifter, 4-first guide bar, 5-rotating frame, 6-rotating lever, 7-back plate, 8-stopper, 9-module, 901-supporting case, 902-pressing lever, 903-arc rack, 904-torsion spring, 905-first supporting block, 906-first rotating shaft, 907-first gear, 908-ratchet, 909-second supporting block, 910-second rotating shaft, 911-second guide bar, 912-first spring, 913-bevel gear, 914-second gear, 915-fixed rack, 10-fixing module, 1001-third guide bar, 1002-sliding frame, 1003-second spring, 1004-guide block, 1005-pushing frame, 1006-third spring, 1007-first fixed block, 1008-wedge bar, 1009-fourth spring, 1010-clamp block, 1011-guard housing, 11-clamp assembly, 1101-second fixed block, 1102-third gear, 1103-third rotation shaft, 1104-push rod, 1105-fixed bar, 1106-slide bar, 1107-fifth spring, 12-shrink assembly, 1201-support frame, 1202-fourth guide bar, 1203-link, 1204-sixth spring, 1205-first clamp bar, 13-limit assembly, 1301-ratchet gear, 1302-third fixed block, 1303-second clamp bar, 1304-seventh spring, 1305-pull handle, 14-back pad assembly, 1401-fourth fixed block, 1402-fifth guide bar, 1403-mattress, 1404-eighth springs.

Detailed Description

The invention will be further described with reference to specific embodiments, and it should be understood that terms such as arrangement, mounting, coupling, and connection are to be construed broadly, as for example, fixedly coupled, detachably coupled, or integrally coupled, mechanically coupled, electrically coupled, directly coupled, indirectly coupled via an intervening medium, or in communication between two elements, unless otherwise specifically indicated or defined. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

The utility model provides an adjustable tablet chair of height adaptation, refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10 and fig. 13, including standing foot 1, cushion 2, lifter 3, first guide bar 4, swivel mount 5, swivel rod 6, backplate 7, gag lever post 8, adjusting part 9, fixed subassembly 10 and shrink subassembly 12, the inside welding of standing foot 1 of left and right sides has two first guide bars 4, sliding type is equipped with lifter 3 between the first guide bars 4, lifter 3 and two standing foot 1 slidingtype are connected, all have the damping between lifter 3 and the standing foot 1, the top of lifter 3 is equipped with cushion 2, the rear portion rotation of cushion 2 is equipped with swivel rod 6, the welding has swivel mount 5 on the swivel rod 6, the student can sit on cushion 2 study, the study has tired and can lean on swivel mount 5 rest, the inside left and right sides of swivel mount 5 all slide type is equipped with gag lever post 8, the round hole has been spaced apart on gag lever post 8, be equipped with backplate 7 between the upper portion of gag lever post 8, be equipped with 1, be equipped with on adjusting part 10, be equipped with on the fixed subassembly on the swivel mount 10.

Referring to fig. 1, 2, 3, 5 and 6, the adjusting assembly 9 includes a supporting case 901, a pressing bar 902, an arc 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 guiding bar 911, a first spring 912, a bevel gear 913, a second gear 914 and a fixed rack 915, a supporting case 901 is arranged between the upper parts of the stand legs 1, a lifting bar 3 is slidably connected with the supporting case 901, a pressing bar 902 is rotatably arranged in the middle of the front side of the supporting case 901, the arc rack 903 is welded on the rear side of the pressing bar 902, the torsion spring 904 is arranged between the middle of the left and right sides of the pressing bar 902 and the supporting case 901, two first supporting blocks 905 are arranged in the middle of the inner bottom of the supporting case 901, a first rotating shaft 906 is rotatably arranged between the upper parts of the two first supporting blocks 905, a first gear 907 is arranged in the middle of the first rotating shaft 906, the arc-shaped rack 903 rotates to be meshed with the first gear 907, the left side and the right side of the inner bottom of the supporting shell 901 are welded with second supporting blocks 909, the upper part of each second supporting block 909 is provided with a second rotating shaft 910 in a rotating mode, the inner sides of the second rotating shafts 910 are provided with second guide rods 911 in a sliding mode at intervals, ratchet wheels 908 are arranged between the inner sides of the second guide rods 911 on the same side and the left side and the right side of the first rotating shaft 906, the number of the ratchet wheels 908 is four, two adjacent ratchet wheels 908 are meshed with each other, a first spring 912 is wound on each second guide rod 911, two ends of the first spring 912 are respectively connected with the second rotating shafts 910 and the ratchet wheels 908, the left side and the right side of the lower part of the inner side of the supporting shell 901 are respectively provided with rotating rods, the front sides of each rotating rod and the outer sides of the second rotating shafts 910 are respectively provided with bevel gears 913, the adjacent bevel gears 913 are meshed with each other, the rear sides of each rotating rod are respectively provided with a second gear 914, the left and right sides of lifter 3 all is equipped with fixed rack 915, and fixed rack 915 all meshes with adjacent second gear 914, and push down presses lever 902, can drive second gear 914 and rotate to can drive fixed rack 915 and cushion 2 upward movement, thereby can rise the height of cushion 2.

Referring to fig. 1,2,3, 7,8,9 and 10, the fixing assembly 10 includes a third guide bar 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 bar 1008, a fourth spring 1009, a clamping block 1010 and a protection case 1011, two third guide bars 1001 are symmetrically welded in the middle of the front side of the support case 901 in a left-right manner, the number of the third guide bars 1001 is four, a sliding frame 1002 is slidably disposed between the lower parts of the third guide bars 1001, a pressing bar 902 rotates to contact with the sliding frame 1002, the second springs 1003 are wound on the third guide bars 1001, both ends of the second springs 1003 are respectively connected with the third guide bar 1001 and the sliding frame 1002, the guide blocks 1004 are symmetrically welded in the left-right direction at the lower part of the front side of the support case 901, the sliding type pushing frame 1005 is arranged between the front parts of the guide blocks 1004, the upper parts of the pushing frame 1005 are connected with the sliding frame 1002 in a sliding type, third springs 1006 are symmetrically arranged between the upper parts of the pushing frame 1005 and the sliding frame 1002 in a bilateral symmetry manner, first fixing blocks 1007 are arranged on the upper parts of the inner sides of the standing legs 1, wedge-shaped rods 1008 are arranged in the middle of the first fixing blocks 1007 in a sliding type manner, the pushing frame 1005 moves upwards to be contacted with the wedge-shaped rods 1008, fourth springs 1009 are arranged between the wedge-shaped rods 1008 and the adjacent first fixing blocks 1007, clamping blocks 1010 are welded on the outer sides of the wedge-shaped rods 1008, the clamping blocks 1010 are used for clamping adjacent fixing racks 915, therefore, the sitting pads 2 can be limited, a protecting shell 1011 is arranged between the upper parts of the standing legs 1, the protecting shell 1011 is arranged below the supporting shell 901, and the first fixing blocks and the wedge-shaped rods 1008 are all arranged inside the protecting shell 1011.

Referring to fig. 2 and 13, the contraction assembly 12 includes a supporting frame 1201, a fourth guiding rod 1202, a connecting frame 1203, a sixth spring 1204 and a first clamping rod 1205, the middle part of the rear side of the rotating frame 5 is provided with the supporting frame 1201, the left and right sides of the inside of the supporting frame 1201 are symmetrically welded with the fourth guiding rod 1202 up and down, the connecting frame 1203 is slidably arranged between the front sides of the fourth guiding rod 1202, the sixth spring 1204 is wound on the fourth guiding rod 1202, two ends of the sixth spring 1204 are respectively connected with the supporting frame 1201 and the connecting frame 1203, three first clamping rods 1205 are respectively arranged at intervals on the left and right sides of the front side of the connecting frame 1203, the first clamping rods 1205 are slidably connected with the rotating frame 5, the first clamping rods 1205 are respectively clamped with adjacent limiting rods 8, and when the first clamping rods 1205 move backward, the limiting rods 8 can be loosened, at this time, the students can move the back plate 7 up and down, and the limiting rods 8 are driven to move up and down, and the purpose of adjusting the height of the back plate 7 is achieved.

When students need to use the tablet chair, the front part of the pressing rod 902 can be pushed downwards, so that the pressing rod 902 rotates, the torsion spring 904 deforms, the pressing rod 902 drives the arc-shaped rack 903 to move upwards, when the pressing rod 902 contacts with the sliding frame 1002, the sliding frame 1002 is driven to move upwards, the second spring 1003 compresses, the sliding frame 1002 drives the third spring 1006 and the pushing frame 1005 to move upwards, when the pushing frame 1005 contacts with the wedge rod 1008, the wedge rod 1008 is pressed to move inwards, the fourth spring 1009 stretches, the wedge rod 1008 drives the clamping block 1010 to move inwards to loosen the fixed rack 915, when the pushing frame 1005 cannot move upwards, the sliding frame 1002 continues to move upwards, the third spring 1006 compresses, when the arc-shaped rack 903 is meshed with the first gear 907, the first gear 907 is driven to rotate, so that the first rotating shaft 906 and the inner two ratchets 908 are driven to rotate, the outer ratchets 908 drive the second guide rod 911 and the second rotating shaft 910 to rotate, the second rotating shaft 910 can drive the rotating rod to rotate through the meshing of the bevel gears 913, the rotating rod drives the second gear 914 to rotate, the second gear 914 drives the fixed rack 915 to move upwards, so that the lifting rod 3 is driven to move upwards, and the lifting rod 3 drives the cushion 2, a rotary rod 6, The rotating frame 5 and the back plate 7 move upwards, then the pressing rod 902 is released, the torsion spring 904 is restored, the pressing rod 902 is driven to reversely reset, the pressing rod 902 drives the arc-shaped racks 903 to downwardly move and reset, at the moment, the pressing rod 902 is separated from the sliding frame 1002, the third spring 1006 is firstly restored to original shape, the sliding frame 1002 is driven to downwardly move and reset, simultaneously, the arc-shaped racks 903 drive the first gear 907 to reversely rotate, thereby driving the first rotating shaft 906 and the inner two ratchets 908 to reversely rotate, further, the outer two ratchets 908 are extruded to outwardly move, the first spring 912 is compressed, the outer two ratchets 908 do not rotate, when the arc-shaped racks 903 are separated from the first gear 907, the first spring 912 is restored to original shape, the outer two ratchets 908 are driven to inwardly move and reset, so that the adjacent two ratchets 908 are re-meshed, after the third spring 1006 is completely restored to original shape, the sliding frame 1002 is driven to move downwards to reset, the sliding frame 1002 drives the third spring 1006 and the pushing frame 1005 to move downwards to reset, the pushing frame 1005 is separated from the wedge rod 1008, the fourth spring 1009 is restored, the wedge rod 1008 and the clamping block 1010 are driven to move outwards to reset, the clamping block 1010 clamps the fixed rack 915, so that the positions of the lifting rod 3 and the cushion 2 can be fixed, the height of the cushion 2 can be raised again by repeating the operation, after the cushion 2 moves to a proper height, the pushing of the pressing rod 902 is stopped, the connecting frame 1203 is pressed backwards, the sixth spring 1204 compresses, the connecting frame 1203 drives the first clamping rod 1205 to move backwards, the limiting rod 8 is loosened by the first clamping rod 1205, at the moment, the student can move the back plate 7 up and down, the limiting rod 8 is driven to move up and down, when the back plate 7 moves to a proper height, the connecting frame 1203 is loosened, the sixth spring 1204 is restored to the original state, the connecting frame 1203 and the first clamping rod 1205 are driven to move forwards for resetting, the first clamping rod 1205 stretches into different round holes, so that positions of the back plate 7 and the limiting rod 8 can be fixed, then students can sit on the seat cushion 2 for learning, the students can rest on the rotating frame 5 and the back plate 7, the rear part of the seat cushion 2 can limit the rotating frame 5, when the students need to reduce the height of the seat cushion 2, the front part of the pressing rod 902 is pushed downwards, the clamping block 1010 moves inwards to loosen the fixed rack 915, the seat cushion 2 can be pressed downwards, and the lifting rod 3 is driven, Fixed rack 915, rotary rod 6, swivel mount 5 and backplate 7 down move, after cushion 2 moves suitable height, stop pressing down cushion 2, then loosen and press lever 902, make fixture block 1010 to outside motion reset and block fixed rack 915 again, when the student need move this tablet chair, can rotate forward swivel mount 5, drive backplate 7 and rotate forward, make backplate 7 and cushion 2 contact, thereby make things convenient for the student to move this tablet chair, after this tablet chair carries the assigned position, rotate the swivel mount 5 backward and reset, drive backplate 7 and rotate backward and reset, then can continue to use this tablet chair.

Example 2

Based on embodiment 1, referring to fig. 3, 11 and 12, the device further comprises a clamping assembly 11, the clamping assembly 11 comprises a second fixed block 1101, a third gear 1102, a third rotating shaft 1103, a push rod 1104, fixed rods 1105, sliding rods 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 supporting shell 901, a third rotating shaft 1103 is rotatably arranged between the lower parts of the second fixed blocks 1101, the middle of the third rotating shaft 1103 is provided with the third gear 1102, an arc-shaped rack 903 is meshed with the third gear 1102, the third gear 1102 is a one-way gear, push rods 1104 are arranged on the left side and the right side of the third rotating shaft 1103, two fixed rods 1105 are welded on the left side and the right side of the bottom of the supporting shell 901, a sliding rod 1106 is arranged between the two fixed rods 1105 on the same side, the sliding rods 1106 are in contact with the sliding rods 1106, the sliding rods 1106 are in contact with the adjacent wedge-shaped rods 1008, so that the wedge-shaped rods 1008 can be blocked, a limiting function is achieved, the lower parts of the fixed rods are wound with the fifth spring 1107, and two ends of the fifth spring 1107 are respectively connected with the fixed rods 1105 and the sliding rods 1106.

When the pressing rod 902 rotates, the arc-shaped rack 903 is driven to move upwards, 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, the push rod 1104 can press the slide rod 1106 to move backwards, the fifth spring 1107 compresses, the slide rod 1106 does not block the inner side of the wedge rod 1008, then the pressing rod 902 can be contacted with the sliding frame 1002, thereby driving the wedge rod 1008 and the clamping block 1010 to move inwards, the clamping block 1010 is enabled to release the fixed rack 915, then the arc-shaped rack 903 can be separated from the third gear 1102, at this time, the wedge rod 1008 blocks the front side of the slide rod, the slide rod 1106 does not reset forwards, when the pressing rod 902 is in reverse reset, the arc-shaped rack 903 is driven to move downwards, the pressing rod 902 can be separated from the sliding frame 1002, thereby driving the wedge rod 1008 and the clamping block 1010 to move outwards, the wedge rod 915 is enabled to be clamped again, when the wedge rod 1008 is separated from the slide rod, the fifth spring 1107 is restored to be in shape, the original state, the slide rod 1106 is driven to move forwards to reset, the clamping rod is pushed to reset in reverse, when the arc-shaped rack 903 is in reverse, the reverse rotation is enabled to be meshed with the third gear 1102 again, and the inner side of the third gear 1102 is driven to move inwards, and the third gear 1008 is prevented from being driven to move forwards, and the fixed, and the slide rod 1102 is prevented from being too much to be released.

Referring to fig. 1, 2 and 14, the device further comprises a limiting component 13, the limiting component 13 comprises a ratchet gear 1301, a third fixing block 1302, a second clamping rod 1303, a seventh spring 1304 and a pull handle 1305, the ratchet gear 1301 is arranged on the left side and the right side of the rotating rod 6, the third fixing block 1302 is welded on the left side and the right side of the rear portion of the cushion 2 symmetrically, a second clamping rod 1303 is arranged on the third fixing block 1302 in a sliding mode, the second clamping rod 1303 clamps the adjacent ratchet gear 1301, and therefore the rotating rod 6 and the rotating frame 5 can be limited, the seventh spring 1304 is arranged between the second clamping rod 1303 and the adjacent third fixing block 1302, and the pull handle 1305 is arranged between the lower portion of the second clamping rod 1305.

When a student needs to rotate the rotating frame 5 forwards, the pull handle 1305 is pulled downwards firstly to drive the second clamping rod 1303 to move downwards, the seventh spring 1304 is compressed, the second clamping rod 1303 is enabled to loosen the ratchet gear 1301, then the rotating frame 5 can be rotated forwards to drive the rotating rod 6 and the ratchet gear 1301 to rotate, meanwhile, the rotating frame 5 drives the back plate 7 to rotate forwards, when the back plate 7 is in contact with the cushion 2, the pull handle 1305 is loosened, the seventh spring 1304 is restored to the original state to drive the pull handle 1305 and the second clamping rod 1303 to move upwards to reset, the second clamping rod 1303 is enabled to clamp the ratchet gear 1301 again, then the student can carry the chair, after the chair is carried to a designated position, the rotating frame 5 is enabled to rotate backwards to reset, the back plate 7 is enabled to be in contact with the cushion 2, meanwhile, the rotating frame 5 is enabled to drive the rotating rod 6 and the ratchet gear 1301 to rotate backwards, the ratchet gear 1301 can be extruded to move downwards, the seventh spring 1304 is compressed, after the rotating frame 5 is completely reset, the seventh spring is enabled to restore the original state, the second clamping rod 1303 is driven to move upwards, the second clamping rod 1303 is enabled to move upwards, the rotating frame 1303 can be prevented from being clamped, and the rotating frame 1301 can be rotated randomly, and the student can rotate freely, and the student can be prevented from being rotated and sitting conveniently.

Referring to fig. 1,2, 3 and 15, the back pad assembly 14 is further included, 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 on the left and right parts of the rotating frame 5, the fifth guide rods 1402 are slidably arranged on the fourth fixed blocks 1401, the cushion 1403 is arranged between the front sides of the fifth guide rods 1402, when a student leans against the rotating frame 5 and the backboard 7 to rest, the back of the student leans against the cushion 1403, comfort is improved, the eighth springs 1404 are wound on the fifth guide rods 1402, and two ends of the eighth springs 1404 are connected with the fourth fixed blocks 1401 and the cushion 1403 respectively.

When a student leans against the rotating frame 5 and the back plate 7 for rest, the back of the student can press the cushion 1403 to move backwards, the fifth guide rod 1402 is driven to move backwards, the eighth spring 1404 is compressed, the cushion 1403 is softer, the student can feel more comfortable when resting, and when the back of the student is far away from the cushion 1403, the eighth spring 1404 is restored to the original state, and the fifth guide rod 1402 and the cushion 1403 are driven to move forwards for resetting.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an adjustable tablet chair of height adaptation, including standing foot (1), cushion (2), lifter (3), first guide bar (4), swivel mount (5), rotary rod (6), backplate (7) and gag lever post (8), the inside two first guide bars (4) that all are equipped with of standing foot (1) of left and right sides, sliding type is equipped with lifter (3) between first guide bar (4), lifter (3) are connected with two slidingtype of standing foot (1), all have the damping between lifter (3) and standing foot (1), the top of lifter (3) is equipped with cushion (2) that are used for letting the student comfortable sitting, the rear portion rotation of cushion (2) is equipped with rotary rod (6), be equipped with on rotary rod (6) and be used for providing swivel mount (5) of back for the student, the inside left and right sides of swivel mount (5) all slide type is equipped with gag lever post (8), be equipped with backplate (7) between gag lever post (8) upper portion, a serial communication port, still including adjusting part (9), fixed subassembly (10) and foot shrink subassembly (12), be equipped with on standing foot (1) and be used for carrying out fixed subassembly (10) on height-adjusting subassembly (1), the rotating frame (5) is provided with a contraction component (12) for adjusting the height of the backboard (7);

The adjusting component (9) comprises 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 wheel (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), wherein the supporting shell (901) is arranged between the upper parts of the standing legs (1), the lifting rod (3) is slidably connected with the supporting shell (901), the pressing rod (902) is rotatably arranged in the middle of the front side of the supporting shell (901), the arc-shaped rack (903) is arranged on the rear side of the pressing rod (902), the torsion spring (904) is arranged between the middle of the left side and the right side of the pressing rod (902) and the supporting shell (901), two first supporting blocks (905) are arranged in the middle of the inner bottom of the supporting shell (901), the first rotating shaft (906) is arranged between the upper parts of the two first supporting blocks (905), the first rotating shaft (906) is rotatably arranged in the middle of the first rotating shaft (903), the first gear (903) is rotatably arranged on the middle of the first rotating shaft, the right side of the first rotating shaft (903) is meshed with the left side and the right side of the first supporting block (907) and the right side of the first supporting shell (907) is meshed with the right side of the arc-shaped supporting shell (901), the upper part of the second supporting block (909) is provided with a second rotating shaft (910) in a rotating way, the inner sides of the second rotating shafts (910) are provided with second guide rods (911) in a sliding way at intervals, ratchet wheels (908) are arranged 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 the ratchet wheels (908) is four, two adjacent ratchet wheels (908) are meshed with each other, the second guide rods (911) are wound with first springs (912), two ends of each first spring (912) are respectively connected with the second rotating shafts (910) and the ratchet wheels (908), the left and right sides of the inner lower part of the supporting shell (901) are respectively provided with rotating rods in a rotating way, the front sides of the rotating rods and the outer sides of the second rotating shafts (910) are respectively provided with bevel gears (913), the adjacent two bevel gears (913) are meshed with each other, the rear sides of the rotating rods are respectively provided with second gears (914), the left and right sides of the lifting rods (3) are respectively provided with fixed racks (915), and the fixed racks (915) are meshed with the adjacent second gears (914);

Including third guide bar (1001), carriage (1002), second spring (1003), guide block (1004), pushing frame (1005), third spring (1006), first fixed block (1007), wedge bar (1008), fourth spring (1009), fixture block (1010) and protecting crust (1011), the front side middle part bilateral symmetry of supporting crust (901) is equipped with two third guide bars (1001), the quantity of third guide bar (1001) is four, sliding type is equipped with carriage (1002) between third guide bar (1001) lower part, pressing bar (902) rotates and can contact with carriage (1002), all around second spring (1003) on third guide bar (1001), both ends of second spring (1003) are connected with third guide bar (1001) and carriage (1002) respectively, the front side lower part bilateral symmetry of supporting crust (901) is equipped with guide block (1004), sliding type is equipped with pushing frame (1005) between guide block (1004) front portion, pushing frame (1005) upper portion is connected with carriage (1002) sliding type, pushing frame (1005) upper portion is equipped with wedge bar (1005) and side upper portion (1002) is equipped with first fixed block (1002) of bilateral symmetry, upper portion (1008) is equipped with first fixed block (1002), the pushing frame (1005) moves upwards to be in contact with the wedge-shaped rod (1008), a fourth spring (1009) is arranged between the wedge-shaped rod (1008) and the adjacent first fixed block (1007), a clamping block (1010) is arranged on the outer side of the wedge-shaped rod (1008), the clamping block (1010) clamps the adjacent fixed rack (915), a protecting shell (1011) is arranged between the upper parts of the standing legs (1), the protecting shell (1011) is arranged below the supporting shell (901), and the first fixed block (1007) and the wedge-shaped rod (1008) are both arranged inside the protecting shell (1011);

Still including being used for carrying out spacing chucking subassembly (11) to wedge pole (1008), chucking subassembly (11) are including second fixed block (1101), third gear (1102), third rotation axis (1103), push rod (1104), dead lever (1105), slide bar (1106) and fifth spring (1107), be equipped with two second fixed block (1101) in the front side middle part of support shell (901) bottom, rotate between second fixed block (1101) lower part and be equipped with third rotation axis (1103), third rotation axis (1103) middle part is equipped with third gear (1102), arc rack (903) and third gear (1102) meshing, third gear (1102) are the unidirectional gear, the left and right sides of third rotation axis (1103) all is equipped with push rod (1104), all be equipped with two dead levers (1105) in the left and right sides of support shell (901) bottom, all slide bar (1106) are equipped with slide bar (1106) between two dead levers (1106) of homonymy, push rod (1106) rotate and can contact with adjacent wedge pole (1008), dead lever (1105) lower part (1105) have both sides spring (1105) to be connected with fifth spring (1107) respectively.

2. The height-adaptive adjustable tablet chair according to claim 1, wherein the contraction component (12) comprises a supporting frame (1201), a fourth guide rod (1202), a connecting frame (1203), a sixth spring (1204) and a first clamping rod (1205), the supporting frame (1201) is arranged in the middle of the rear side of the rotating frame (5), the fourth guide rod (1202) is symmetrically arranged on the left side and the right side of the inside of the supporting frame (1201), the connecting frame (1203) is slidably arranged between the front sides of the fourth guide rod (1202), the sixth spring (1204) is wound on the fourth guide rod (1202), two ends of the sixth spring (1204) are respectively connected with the supporting frame (1201) and the connecting frame (1203), three first clamping rods (1205) are arranged on the left side and the right side of the front side of the connecting frame (1203) at intervals, the first clamping rods (1205) are slidably connected with the rotating frame (5), and limiting rods (8) are respectively clamped adjacent to the first clamping rods (1205).

3. The height-adaptive adjustable tablet chair according to claim 2, further comprising a limiting component (13) for limiting the rotating frame (5), wherein the limiting component (13) comprises a ratchet gear (1301), a third fixing block (1302), a second clamping rod (1303), a seventh spring (1304) and a pull handle (1305), the ratchet gear (1301) is arranged on the left side and the right side of the rotating rod (6), the third fixing block (1302) is symmetrically arranged on the left side and the right side of the rear portion of the cushion (2), the second clamping rod (1303) is arranged on the third fixing block (1302) in a sliding mode, the second clamping rod (1303) clamps the adjacent ratchet gear (1301), the seventh spring (1304) is arranged between the second clamping rod (1303) and the adjacent third fixing block (1302), and the pull handle (1305) is arranged between the lower portions of the second clamping rod (1303).

4. A height-adaptive adjustable tablet chair according to claim 3, further comprising a back cushion assembly (14) for improving comfort, wherein the back cushion assembly (14) comprises a fourth fixed block (1401), a fifth guide rod (1402), a cushion (1403) and an eighth spring (1404), two fourth fixed blocks (1401) are respectively arranged at the left and right parts of the rotating frame (5), the fifth guide rod (1402) is respectively arranged on the fourth fixed blocks (1401) in a sliding manner, the cushion (1403) is arranged between the front sides of the fifth guide rods (1402), the eighth spring (1404) is respectively wound on the fifth guide rods (1402), and two ends of the eighth spring (1404) are respectively connected with the fourth fixed blocks (1401) and the cushion (1403).

5. Height-adaptive adjustable tablet chair according to claim 1, characterized in that the limit rods (8) are each provided with round holes at intervals.