Writing board

Abstract

The utility model discloses a writing board, which is provided with a first direction, a front-back direction and an up-down direction, and comprises a fixed rack, a first support and a second support, the sliding frame is adjustable in the front-back direction relative to the fixed rack; the linkage mechanism is provided with a first linkage wheel, a second linkage wheel and a middle linkage assembly; the first linkage wheel is meshed with the fixed rack; the first linkage wheel and the second linkage wheel are arranged in a spaced mode in the front-back direction, move in the front-back direction along with the sliding frame, rotate around the axis parallel to the first direction and are in transmission connection through a middle linkage assembly; the turnover connecting piece is fixed relative to the second linkage wheel; and the bearing plate body is rotationally connected with the turnover connecting piece. According to the technical scheme, the step of unfolding or storing the writing board by a user can be reduced, compact arrangement of the auditorium chair is facilitated, and design and debugging are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of multifunctional seats, especially a writing board. Background Art

[0002] Auditorium chairs are applicable to places such as auditoriums, theaters, conference halls, lecture halls, etc. According to the usage requirements, the auditorium chairs used in conference halls, etc. are provided with writing boards for placing documents and recording.

[0003] Generally, a writing board includes a stretching and sliding mechanism and a supporting plate body turning mechanism. When using the writing board, the user needs to first pull out the supporting plate body forward, then rotate the supporting plate body upward by 180 degrees, and then rotate the supporting plate body around the horizontal axis by 90 degrees to complete the unfolding of the writing board. The unfolding steps are numerous and the use is relatively inconvenient.

[0004] Although there are writing boards using link mechanisms in the prior art, the sliding mechanism and the supporting plate body turning mechanism are connected through the link mechanism. When unfolding the writing board, the user directly drives the supporting plate body to rotate upward by 180 degrees. During the process of the supporting plate body rotating upward, the link mechanism will drive the sliding mechanism, so that components such as the supporting plate body will automatically stretch forward, thus reducing the unfolding steps of the writing board. However, using a link mechanism requires accurately calculating the lengths of each link. If there is a slight error in the calculation, it will lead to problems such as the link mechanism getting stuck. When it is necessary to adapt to auditorium chairs of different specifications, it is necessary to recalculate the lengths of each link, the calculation amount is large, the design is inconvenient, and using a link mechanism will result in a larger width of the writing board, which is not conducive to the compact arrangement of auditorium chairs. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is: to provide a writing board to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0006] The solution of the utility model to solve its technical problem is:

[0007] A writing board is provided with a first direction, a front-back direction, and an up-down direction. The writing board includes:

[0008] A fixed rack;

[0009] A sliding frame, which is adjustable relative to the fixed rack in the front-back direction;

[0010] A linkage mechanism, wherein the linkage mechanism is provided with a first linkage wheel, a second linkage wheel and an intermediate linkage assembly; the first linkage wheel is meshed with the fixed rack; the first linkage wheel and the second linkage wheel are arranged at intervals along the front-to-back direction, the first linkage wheel and the second linkage wheel move along the front-to-back direction with the sliding frame, the first linkage wheel and the second linkage wheel both rotate around an axis parallel to the first direction, and the first linkage wheel and the second linkage wheel are transmission-connected through the intermediate linkage assembly;

[0011] A flip connecting member, wherein the flip connecting member is fixed relative to the second linkage wheel;

[0012] A supporting plate body is rotatably connected to the flip connecting piece.

[0013] Through the above technical solution, when the flip connector rotates around the axis parallel to the first direction, it will drive the first linkage wheel to rotate, and the power of the first linkage wheel is transmitted to the second linkage wheel through the intermediate linkage assembly, and the second linkage wheel rotates. Since the second linkage wheel is engaged with the fixed rack, when the second linkage wheel rotates, the second linkage wheel will drive the sliding frame to slide in the front-back direction, so that when the user drives the supporting board to rotate around the axis parallel to the first direction, the supporting board can be pushed forward or stored backward at the same time. This can reduce the steps for the user to unfold or store the writing board.

[0014] Compared with the solution of connecting rod structure connecting the flip connector and the sliding frame adopted in the prior art, the overall width of the writing board in this solution is smaller (the overall width of the writing board referred to here refers to the width of the writing board as a whole in the first direction, rather than the width of the board surface of the supporting board body), which is conducive to the compact arrangement of auditorium chairs, and the calculation complexity is also smaller than that of the connecting rod solution. At the same time, this solution is not prone to jamming, which is convenient for design and debugging.

[0015] As a further improvement of the above technical solution, it also includes a connecting frame, the sliding frame is provided with a limiting member, the connecting frame is provided with a limiting groove, and the limiting member slides in the limiting groove.

[0016] Through the above technical solution, by setting the limiting member and the limiting groove, the sliding position of the sliding frame can be limited, thereby preventing the sliding frame from escaping from the connecting frame, thereby ensuring that the writing board can be used normally.

[0017] As a further improvement of the above technical solution, a guide assembly is also included, and the guide assembly includes:

[0018] A guide rail extending along the front-rear direction;

[0019] The guide groove body, the guide rail and the guide groove body are respectively arranged on the sliding frame and the connecting frame, and the guide groove body and the guide rail are slidably connected.

[0020] Through the above technical solution, by setting up a guide groove body and a guide rail, the sliding direction of the sliding frame relative to the connecting frame can be guided, so that the sliding frame will not be offset during the sliding process relative to the connecting frame, thereby ensuring the normal operation of the writing board.

[0021] As a further improvement of the above technical solution, an anti-collision buffer mechanism is also included, and the anti-collision buffer mechanism includes:

[0022] A swing structure, wherein the front end of the swing structure is movably connected to the connecting frame, and the swing structure is provided with a first stroke and a second stroke; in the first stroke, the front end of the swing structure moves along the front-to-back direction; in the second stroke, the front end of the swing structure moves along the up-down direction; the rear end of the swing structure and the connecting frame are adjustable along the front-to-back direction;

[0023] A first swing driving member, wherein the first swing driving member is relatively fixed to the sliding frame; the first swing driving member is used to drive the front end of the swing structure to swing downward;

[0024] A second swing driving member, the second swing driving member is relatively fixed to the sliding frame, and the second swing driving member and the first swing driving member are arranged at intervals along the front-to-back direction; the second swing driving member is used to drive the front end of the swing structure to swing upward; a buffer elastic member, the two ends of the buffer elastic member are respectively hinged to the connecting frame and the front end of the swing structure.

[0025] Through the above technical solution, during the process of the sliding frame being folded, the buffer elastic member can buffer the sliding frame, thereby preventing the sliding frame from violently colliding with other components due to the excessively fast speed during folding, thereby avoiding disturbing other people, and avoiding violent collisions can effectively increase the service life of the writing board, thereby ensuring that the writing board can be used normally and stably for a long time. After the sliding frame is completely folded, the cooperation of the swing structure and the buffer elastic member can lock the sliding frame.

[0026] As a further improvement of the above technical solution, the buffer elastic member is a telescopic gas rod.

[0027] As a further improvement of the above technical solution, the intermediate linkage assembly includes multiple intermediate transmission gears, and the multiple intermediate transmission gears are transmission connected in sequence. The intermediate transmission gears located at both ends are transmission connected to the first linkage wheel and the second linkage wheel respectively.

[0028] Through the above technical solution, the intermediate linkage component is set in the form of a plurality of intermediate transmission gears, which is not easily damaged and has a long service life compared with structures such as transmission belts.

[0029] As a further improvement of the above technical solution, several speed regulation groups are formed by the first linkage wheel, the second linkage wheel, and the intermediate transmission gears. Each speed regulation group includes two speed regulation wheels with different sizes, and the two speed regulation wheels are fixedly connected.

[0030] Through the above technical solution, within the same speed regulation group, power is transmitted from the speed regulation wheel with a smaller diameter to the speed regulation wheel with a larger diameter, thereby achieving acceleration. After the flipping connecting piece rotates 180 degrees, there is a certain distance between the supporting plate body and the chair back, so as to ensure that the user can sit on the auditorium chair and use the writing board normally.

[0031] As a further improvement of the above technical solution, a limiting mechanism is further included, and the limiting mechanism includes:

[0032] A first cam limiting part fixedly arranged on the flipping connecting piece, the first cam limiting part is provided with a first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface are arranged at 90 degrees with respect to the rotation axis of the flipping connecting piece and the supporting plate body;

[0033] A second cam limiting part adjustable relative to the supporting plate body; the second cam limiting part is provided with a third limiting surface, and the third limiting surface abuts against the first limiting surface or the second limiting surface to complete the limiting of the supporting plate body;

[0034] A limiting reset part, the limiting reset part is an elastic member, and the limiting reset part makes the second cam limiting part always have a tendency to approach the first cam limiting part.

[0035] Through the above technical solution, the third limiting surface cooperates with the second limiting surface or the first limiting surface to limit the rotation angle of the supporting plate body relative to the flipping connecting piece. By setting the limiting reset part, the second cam limiting part always has a tendency to move towards the flipping connecting piece, so as to ensure that the third limiting surface abuts against the second limiting surface or the first limiting surface to realize the 0-degree or 90-degree limiting of the supporting plate body.

[0036] As a further improvement of the above technical solution, a locking component is further included, and the locking component includes:

[0037] A moving groove arranged on the sliding frame, the moving groove includes a main groove body and a locking groove body, the two ends of the main groove body are arranged vertically, and the locking groove body is communicated with the end of the main groove body;

[0038] A locking member, which is adjustable relative to the flipping connecting member. The locking member is provided with a locking portion, and the locking portion is slidably connected to the moving groove;

[0039] A locking reset member, which is an elastic member. The locking reset member makes the locking portion always have a tendency to disengage from the locking groove body;

[0040] A control cam portion, which is arranged on the supporting plate body; the control cam portion drives the locking member to approach or depart from the sliding frame, so that the locking portion enters or disengages from the locking groove body.

[0041] Through the above technical solution, when the farther end of the control cam portion from the rotation axis of the supporting plate body abuts against the locking member, the locking member will be pushed away from the supporting plate body, so that the locking portion enters the locking groove body to realize the locking of the flipping connecting member. When the nearer end of the control cam portion from the rotation axis abuts against the locking member, due to the existence of the locking reset member, the locking reset member will drive the locking member to move towards the supporting plate body, so that the locking portion disengages from the locking groove body, thereby realizing the unlocking of the flipping connecting member.

[0042] As a further improvement of the above technical solution, chamfers are provided at multiple corners of the supporting plate body.

[0043] Through the above technical solution, by providing chamfers at the corners of the supporting plate body, compared with the solution where the corners of the supporting plate body are set as sharp corners, it can avoid passers-by being easily scratched by the sharp corners, and can also reduce the pain of others when they collide with the supporting plate body when passing by the unfolded writing board, thereby improving the safety of this writing chair.

[0044] The beneficial effects of the present utility model are: it can reduce the steps for the user to unfold or store the writing board; the product has a smaller width and simple design and debugging.

[0045] The present utility model is used in the technical field of multifunctional seats. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly describe the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present utility model, rather than all the embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0047] Figure 1 is the overall structural schematic diagram of the embodiment of the present utility model;

[0048] Figure 2 is the cross-sectional structural schematic diagram of the embodiment of the present utility model;

[0049] Figure 3 is a schematic explosion structure diagram of an embodiment of the present utility model;

[0050] Figure 4 is a schematic explosion structure diagram of some components of an embodiment of the present utility model.

[0051] In the figure, 100 is a connecting frame; 110 is a fixed rack; 120 is an anti-collision buffer mechanism; 121 is a swing structure; 122 is a first swing driving member; 123 is a second swing driving member; 124 is a buffer elastic member; 125 is a rear guiding groove; 126 is a first stroke guiding groove; 127 is a second stroke guiding groove; 130 is a guiding component; 131 is a guiding track; 132 is a guiding groove body; 140 is a limiting component; 141 is a limiting member; 142 is a limiting groove; 200 is a sliding frame; 210 is a linkage mechanism; 211 is an intermediate linkage component; 212 is a second linkage wheel; 213 is a first linkage wheel; 214 is an intermediate transmission gear; 300 is a flipping connecting member; 400 is a supporting plate body; 500 is a limiting mechanism; 510 is a first cam limiting portion; 511 is a first limiting surface; 512 is a second limiting surface; 520 is a second cam limiting portion; 521 is a third limiting surface; 530 is a limiting reset member; 600 is a locking component; 610 is a moving groove; 611 is a locking groove body; 612 is a main groove body; 620 is a locking member; 621 is a locking portion; 630 is a locking reset member; 640 is a control cam portion. Detailed implementation manners

[0052] The following will clearly and completely describe the concept, specific structure and technical effects generated by the present utility model in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present utility model. In addition, all the connection / connection relationships mentioned in the text do not refer only to the direct connection of components, but mean that more excellent connection structures can be formed according to the specific implementation situation by adding or reducing connection auxiliary components. Each technical feature in the present invention can be combined interactively without conflicting with each other.

[0053] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0054] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, while understandings such as "above", "below", "within", etc. include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0055] Refer to Figures 1 to 4 , a writing board, is provided with a first direction, an up-down direction, and a front-back direction. The writing board includes a housing (the housing is not shown in the figure), a connecting frame 100, a fixed rack 110, a sliding frame 200, a linkage mechanism 210, a flipping connecting member 300, a supporting plate body 400, a guiding assembly 130, an anti-collision buffer mechanism 120, a limiting mechanism 500, and a locking assembly 600.

[0056] The housing is fixedly installed beside the auditorium chair. When the writing board is in the storage state, the connecting frame 100, the sliding frame 200, the flipping connecting member 300, and the supporting plate body 400 are all arranged inside the housing. In other embodiments, the housing may not be provided, such that structures such as the connecting frame 100, the sliding frame 200, the flipping connecting member 300, and the supporting plate body 400 are exposed beside the auditorium chair, and those skilled in the art can choose whether to provide the housing according to actual needs.

[0057] The connecting frame 100 is fixedly connected to the housing by screws. The connecting frame 100 has a "C"-shaped structure with an opening facing downward.

[0058] Refer to Figure 1 , the fixed rack 110 is relatively fixed to the connecting frame 100 by screws, and a plurality of strip-shaped holes are formed in the connecting frame 100 with the length direction parallel to the front-back direction. The screws for connecting the fixed rack 110 and the connecting frame 100 pass through the strip-shaped holes, and the fixed rack 110 can move relative to the connecting frame 100 to a certain extent in the front-back direction so that the position of the fixed rack 110 can be finely adjusted. After the fine adjustment is completed, the fixed rack 110 and the connecting frame 100 are locked by screws.

[0059] Refer to Figure 1 and Figure 2 , the sliding frame 200 is arranged inside the connecting frame 100, and the sliding frame 200 is slidably connected to the connecting frame 100 in the front-back direction. Specifically, in this embodiment, a guiding assembly 130 is provided between the sliding frame 200 and the connecting frame 100. The guiding assembly 130 includes a guiding groove body 132 and a guiding track 131. The guiding track 131 extends in the front-back direction, the guiding track 131 is fixedly installed on the inner side of the connecting frame 100, the guiding groove body 132 is arranged on the sliding frame 200, and the guiding groove body 132 is slidably connected to the guiding track 131.

[0060] By providing the guiding groove body 132 and the guiding track 131, the sliding direction of the sliding frame 200 relative to the connecting frame 100 can be guided, so that the sliding frame 200 will not deviate during the process of sliding relative to the connecting frame 100, thus ensuring the normal operation of this writing board.

[0061] Refer to Figure 1 and Figure 2 Specifically, in this embodiment, a limiting component 140 is provided between the sliding frame 200 and the connecting frame 100. The limiting component 140 includes a limiting member 141 and a limiting groove 142. The limiting member 141 protrudes from the sliding frame 200, the limiting groove 142 is formed in the side wall of the connecting frame 100, the limiting groove 142 extends in the front-rear direction, the limiting member 141 is arranged in the limiting groove 142, and the limiting member 141 is slidably connected with the limiting groove 142. By providing the limiting member 141 and the limiting groove 142, the sliding position of the sliding frame 200 can be restricted, so as to prevent the sliding frame 200 from disengaging from the connecting frame 100, thus ensuring the normal use of this writing board.

[0062] Refer to Figures 1 to 3 Specifically, the anti-collision and buffering mechanism 120 is provided between the sliding frame 200 and the connecting frame 100.

[0063] The anti-collision and buffering mechanism 120 includes: a swinging structure 121, a second swinging driving member 123, a first swinging driving member 122, and a buffering elastic member 124.

[0064] A rear guiding groove 125, a first stroke guiding groove 126, and a second stroke guiding groove 127 are formed in the rear end of the connecting frame 100. The first stroke guiding groove 126 is arranged in front of the rear guiding groove 125, the second stroke guiding groove 127 is arranged in front of the first stroke guiding groove 126, and the second stroke guiding groove 127 communicates with the first stroke guiding groove 126. The rear guiding groove 125, the first stroke guiding groove 126, and the second stroke guiding groove 127 are all through grooves penetrating the side wall of the connecting frame 100.

[0065] The front end of the swinging structure 121 is movably connected with the connecting frame 100, and the swinging structure 121 has a second stroke and a first stroke. In the first stroke, the front end of the swinging structure 121 moves in the front-rear direction; in the second stroke, the front end of the swinging structure 121 moves in the up-down direction. Specifically, the front end of the swinging structure 121 is slidably connected with the first stroke guiding groove 126 or the second stroke guiding groove 127. In the first stroke, the front end of the swinging structure 121 is slidably connected with the first stroke guiding groove 126, and in the second stroke, the front end of the swinging structure 121 is slidably connected with the second stroke guiding groove 127.

[0066] The rear end of the swing structure 121 is adjustable in the front-rear direction with respect to the connecting frame 100. Specifically, the rear end of the swing structure 121 is disposed within the rear guide groove 125 and is slidably connected to the rear guide groove 125.

[0067] A swing driving part is provided at the upper end of the swing structure 121.

[0068] The first swing driving member 122 is fixedly connected to the sliding frame 200. The first swing driving member 122 is configured to drive the front end of the swing structure 121 to swing downward. When the sliding frame 200 moves forward, it will drive the first swing driving member 122 to move forward. The first swing driving member 122 will abut against the swing driving part. Since in the first stroke, the swing structure 121 moves in the front-rear direction, at this time the first swing driving member 122 will drive the swing structure 121 to move forward. In the second stroke, the first swing driving member 122 continues to move forward. At this time, the front end of the swing structure 121 will move downward to avoid the first swing driving member 122, so that the sliding frame 200 can continue to move forward.

[0069] The second swing driving member 123 is fixedly connected to the sliding frame 200. The second swing driving member 123 is disposed in front of the first swing driving member 122, and the lower end of the second swing driving member 123 is lower than the uppermost end of the swing driving part. When the sliding frame 200 retracts, the second swing driving member 123 abuts against the swing driving part, and as the sliding frame 200 continues to retract inward, the front end of the swing structure 121 is driven to move upward. Finally, the front end of the swing structure 121 disengages from the second stroke and enters the first stroke. The second swing driving member 123 continues to abut against the swing driving part, causing the swing structure 121 to continue to move inward along the first stroke to reset the swing structure 121.

[0070] Both ends of the buffer elastic member 124 are respectively hinged to the connecting frame 100 and the front end of the swing structure 121. Specifically, in this embodiment, the buffer elastic member 124 is provided as a telescopic air rod. In other embodiments, the buffer elastic member 124 can also be provided as other elastic members such as a spring. Those skilled in the art can select the specific structure of the buffer elastic member 124.

[0071] During the process of the sliding frame 200 being retracted, the buffer elastic member 124 can buffer the sliding frame 200, thereby avoiding a large noise caused by a violent collision between the sliding frame 200 and other components due to too fast a retraction speed, thus avoiding disturbing others, and avoiding violent collisions can effectively improve the service life of this writing board to ensure that this writing board can be used stably and normally for a long time.

[0072] After the sliding frame 200 is completely retracted, the cooperation of the swing structure 121 and the buffer elastic member 124 can lock the sliding frame 200.

[0073] The flipping connecting member 300 is rotatably connected to the front end of the sliding frame 200.

[0074] The supporting plate body 400 is fixedly connected to the flipping connecting member 300.

[0075] Specifically, chamfers are provided at multiple corners of the supporting plate body 400. By providing chamfers at the corners of the supporting plate body 400, compared with the solution where the corners of the supporting plate body 400 are provided as sharp corners, it can prevent passers-by from being easily scratched by the sharp corners, and can also reduce the pain when others collide with the supporting plate body 400 when passing by the unfolded writing board, thereby improving the safety of this writing chair.

[0076] Refer to Figure 1 、 Figure 3 and Figure 4 Specifically, in this embodiment, the limiting mechanism 500 is arranged between the flipping connecting member 300 and the supporting plate body 400. The limiting mechanism 500 includes a first cam limiting portion 510, a second cam limiting portion 520, and a limiting reset member 530.

[0077] The first cam limiting portion 510 is fixedly arranged at one end of the flipping connecting member 300. The first cam limiting portion 510 is provided with a second limiting surface 512 and a first limiting surface 511. Specifically, both the second limiting surface 512 and the first limiting surface 511 are provided as convex surfaces, and the second limiting surface 512 and the first limiting surface 511 are arranged at 90 degrees with respect to the rotation axis of the flipping connecting member 300 and the supporting plate body 400.

[0078] The second cam limiting portion 520 is arranged on the supporting plate body 400. The second cam limiting portion 520 is slidably connected to the supporting plate body 400. The second cam limiting portion 520 is provided with a third limiting surface 521. The third limiting surface 521 abuts against the second limiting surface 512 or the first limiting surface 511. The third limiting surface 521 cooperates with the second limiting surface 512 or the first limiting surface 511 to limit the rotation angle of the supporting plate body 400 relative to the flipping connecting member 300.

[0079] The limiting reset member 530 is arranged on the supporting plate body 400. The limiting reset member 530 is an elastic member.

[0080] Specifically, in this embodiment, the limiting reset member 530 is provided as a spring structure. The two ends of the limiting reset member 530 respectively abut against the supporting plate body 400 and the second cam limiting portion 520. The elastic direction of the limiting reset member 530 points to the flipping connecting member 300.

[0081] By setting the limit and reset member 530, the second cam limit portion 520 always has a tendency to move towards the flipping connecting member 300, so as to ensure that the third limit surface 521 abuts against the second limit surface 512 or the first limit surface 511, thereby realizing the 0-degree or 90-degree limit of the supporting plate body 400.

[0082] Referring to Figure 3 and Figure 4 , the locking component 600 includes a moving groove 610, a locking member 620, a locking reset member 630, and a control cam portion 640.

[0083] The moving groove 610 is formed in the sliding frame 200, and the moving groove 610 includes a locking groove body 611 and a main groove body 612.

[0084] The two ends of the main groove body 612 are arranged vertically. Specifically, in this embodiment, the locking groove body 611 is set as a semi-circular groove body structure. In other embodiments, the locking groove body 611 can also be set as a wavy groove body structure extending along a semi-circular track. Those skilled in the art can select the specific structure of the locking groove body 611 according to actual needs.

[0085] The locking groove body 611 communicates with the upper end of the main groove body 612, and the locking groove body 611 extends from the main groove body 612 towards the rotation axis of the flipping connecting member 300.

[0086] The locking member 620 is arranged on the flipping connecting member 300. The locking member 620 is slidably connected to the flipping connecting member 300. One end of the locking member 620 close to the axis of the flipping connecting member 300 is provided with a locking portion 621. The locking portion 621 is arranged in the moving groove 610 and is slidably connected to the moving groove 610.

[0087] When the locking portion 621 is in the main groove body 612, the flipping connecting member 300 can rotate relative to the sliding frame 200. When the locking portion 621 is in the locking groove body 611, the flipping connecting member 300 is locked to the sliding frame 200, and the flipping connecting member 300 cannot rotate relative to the sliding frame 200, thereby realizing the locking of the flipping connecting member 300.

[0088] Specifically, the control cam portion 640 and the locking reset member 630 are respectively used to control the locking portion 621 to enter or disengage from the locking groove body 611.

[0089] The locking reset member 630 is arranged between the locking member 620 and the flipping connecting member 300. The locking reset member 630 makes the locking member 620 always have a tendency to move away from the rotation axis of the flipping connecting member 300, so that the locking portion 621 always has a tendency to disengage from the locking groove body 611.

[0090] The control cam portion 640 is fixedly disposed on the supporting plate 400 , and the control cam portion 640 abuts against the locking member 620 .

[0091] When the end of the control cam portion 640 that is farther from the rotation axis of the supporting plate body 400 contacts the locking member 620, the locking member 620 is pushed away from the supporting plate body 400, so that the locking portion 621 enters the locking groove 611 to achieve the locking of the flip connector 300. When the end of the control cam portion 640 that is closer to the rotation axis contacts the locking member 620, due to the presence of the locking reset member 630, the locking reset member 630 drives the locking member 620 to move toward the supporting plate body 400, so that the locking portion 621 is separated from the locking groove 611, thereby unlocking the flip connector 300.

[0092] Reference Figures 1 to 3 The linkage mechanism 210 is disposed between the flip connection member 300 and the sliding frame 200 .

[0093] Specifically, the linkage mechanism 210 includes an intermediate linkage assembly 211 , a second linkage wheel 212 and a first linkage wheel 213 .

[0094] The second linkage wheel 212 is arranged at the rear end of the sliding frame 200, and the first linkage wheel 213 is arranged at the front end of the sliding frame 200. The second linkage wheel 212 and the first linkage wheel 213 both rotate about an axis parallel to the first direction. The second linkage wheel 212 and the first linkage wheel 213 are both rotatably connected to the sliding frame 200 through a rotating shaft, so that the second linkage wheel 212 and the first linkage wheel 213 can move along the front and rear directions together with the sliding frame 200.

[0095] The second linkage wheel 212 and the first linkage wheel 213 are transmission-connected via the intermediate linkage assembly 211. Specifically, in the present embodiment, the intermediate linkage assembly 211 includes a plurality of intermediate transmission gears 214, and the plurality of intermediate transmission gears 214 are transmission-connected to each other (the transmission connection here may represent that two adjacent intermediate transmission gears 214 are meshed for transmission or two adjacent intermediate transmission gears 214 are fixedly connected for transmission), and the intermediate transmission gears 214 at both ends are transmission-connected to the second linkage wheel 212 and the first linkage wheel 213 respectively (the transmission connection here may represent that two adjacent intermediate transmission gears 214 are meshed for transmission or two adjacent intermediate transmission gears 214 are fixedly connected for transmission).

[0096] The first linkage wheel 213 is fixedly connected to the flip connection member 300 , so that the first linkage wheel 213 rotates together with the flip connection member 300 . The second linkage wheel 212 is meshed with the fixed rack 110 .

[0097] When the flipping connector 300 rotates around an axis parallel to the first direction, it drives the first linkage wheel 213 to rotate. The power of the first linkage wheel 213 is transmitted to the second linkage wheel 212 through the intermediate linkage assembly 211, and the second linkage wheel 212 rotates. Since the second linkage wheel 212 meshes with the fixed rack 110, when the second linkage wheel 212 rotates, the second linkage wheel 212 drives the sliding frame 200 to slide in the front-back direction. Thus, when the user drives the supporting plate body 400 to rotate around an axis parallel to the first direction, the forward pushing or backward retraction of the supporting plate body 400 can be achieved simultaneously. Thereby, the steps for the user to unfold or retract the writing board can be reduced.

[0098] Specifically, in this embodiment, the intermediate transmission gear 214 located at the rear end is fixedly connected to the second linkage wheel 212, and the intermediate transmission gear 214 located at the front end meshes with the first linkage wheel 213.

[0099] In this embodiment, two speed regulation groups are formed by the intermediate transmission gear 214, the second linkage wheel 212, and the first linkage wheel 213. Each speed regulation group includes two speed regulation wheels which are fixedly connected. The two speed regulation wheels of one speed regulation group are respectively the second linkage wheel 212 and the intermediate transmission gear 214 at one end; the two speed regulation wheels of the other speed regulation group are respectively the two intermediate transmission gears 214 arranged in the middle of the intermediate linkage assembly 211. The sizes of the two gear structures in the same speed regulation group are different. Within the same speed regulation group, the power is transmitted from the speed regulation wheel with a smaller diameter to the speed regulation wheel with a larger diameter, thereby achieving acceleration. Thus, after the flipping connector 300 rotates 180 degrees, there is a certain distance between the supporting plate body 400 and the chair back, so as to ensure that the user can sit on the auditorium chair and use the writing board normally.

[0100] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. Writing tablet, characterized in that: A first direction, a front-to-back direction, and an up-down direction are provided, and the writing board comprises: Fixed rack; A sliding frame, wherein the sliding frame is adjustable in a front-to-rear direction relative to the fixed rack; A linkage mechanism, wherein the linkage mechanism is provided with a first linkage wheel, a second linkage wheel and an intermediate linkage assembly; the first linkage wheel is meshed with the fixed rack; the first linkage wheel and the second linkage wheel are arranged at intervals along the front-to-back direction, the first linkage wheel and the second linkage wheel move along the front-to-back direction with the sliding frame, the first linkage wheel and the second linkage wheel both rotate around an axis parallel to the first direction, and the first linkage wheel and the second linkage wheel are transmission-connected through the intermediate linkage assembly; A flip connecting member, wherein the flip connecting member is fixed relative to the second linkage wheel; A supporting plate body is rotatably connected to the flip connecting piece.

2. The writing tablet according to claim 1, wherein: It also includes a connecting frame, the sliding frame is provided with a limiting member, the connecting frame is provided with a limiting groove, and the limiting member slides in the limiting groove.

3. The writing tablet according to claim 2, wherein: Also included is a guide assembly, the guide assembly comprising: A guide rail extending along the front-rear direction; The guide groove body, the guide rail and the guide groove body are respectively arranged on the sliding frame and the connecting frame, and the guide groove body and the guide rail are slidably connected.

4. The writing tablet according to claim 2, characterized in that: It also includes an anti-collision buffer mechanism, the anti-collision buffer mechanism comprising: A swing structure, wherein the front end of the swing structure is movably connected to the connecting frame, and the swing structure is provided with a first stroke and a second stroke; in the first stroke, the front end of the swing structure moves along the front-to-back direction; in the second stroke, the front end of the swing structure moves along the up-down direction; the rear end of the swing structure and the connecting frame are adjustable along the front-to-back direction; a first swing driving member, wherein the first swing driving member is relatively fixed to the sliding frame; The first swing driving member is used to drive the front end of the swing structure to swing downward; a second swing driving member, the second swing driving member is relatively fixed to the sliding frame, the second swing driving member and the first swing driving member are arranged at intervals along the front-to-back direction; the second swing driving member is used to drive the front end of the swing structure to swing upward; A buffer elastic member, wherein two ends of the buffer elastic member are respectively hinged to the connecting frame and the front end of the swing structure.

5. The writing tablet according to claim 4, wherein: The buffer elastic member is a telescopic gas rod.

6. The writing tablet according to claim 1, wherein: The intermediate linkage assembly includes a plurality of intermediate transmission gears, which are sequentially transmission-connected, and the intermediate transmission gears at both ends are respectively transmission-connected to the first linkage wheel and the second linkage wheel.

7. The writing tablet according to claim 6, characterized in that: The first linkage wheel, the second linkage wheel and the intermediate transmission gear form a plurality of speed regulating groups, and the speed regulating groups include two speed regulating wheels, the two speed regulating wheels are different in size, and the two speed regulating wheels are fixedly connected.

8. The writing tablet according to claim 1, wherein: It also includes a limiting mechanism, which includes: A first cam limiting portion, the first cam limiting portion is fixedly disposed on the flip connection member, the first cam limiting portion is provided with a first limiting surface and a second limiting surface, the first limiting surface and the second limiting surface are arranged at 90 degrees with respect to the rotation axis of the flip connection member and the supporting plate body; A second cam limiting portion, which is adjustable relative to the supporting plate body; the second cam limiting portion is provided with a third limiting surface, and the third limiting surface abuts against the first limiting surface or the second limiting surface to complete the limiting of the supporting plate body; a limiting reset member, which is an elastic member, and the limiting reset member makes the second cam limiting portion always tend to approach the first cam limiting portion.

9. The writing tablet according to claim 1, characterized in that: It further includes a locking component, and the locking component includes: A moving groove, which is arranged on the sliding frame, and the moving groove includes a main groove body and a locking groove body. The two ends of the main groove body are arranged vertically, and the locking groove body is communicated with the end of the main groove body; A locking member, which is adjustable relative to the flipping connecting member, and the locking member is provided with a locking portion, and the locking portion is slidably connected with the moving groove; A locking reset member, which is an elastic member, and the locking reset member makes the locking portion always tend to disengage from the locking groove body; A control cam portion, which is arranged on the supporting plate body; the control cam portion drives the locking member to approach or move away from the sliding frame so that the locking portion enters or disengages from the locking groove body.

10. The writing board according to claim 1, wherein: Chamfers are provided at multiple corners of the supporting plate body.

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