Automatic recycling and rotating device for auditorium chair writing board

Abstract

An automatic recycling and rotating device for an auditorium chair writing board comprises a fixed seat, a rotating seat and a connecting handle, and the rotating seat is rotatably mounted on the fixed seat through a main mounting shaft; the connecting rotating shaft of the connecting handle is rotatably matched on the rotating seat, and a torsional spring is connected between the rotating seat and the connecting rotating shaft; one end of the gas spring is connected to the fixed seat, the other end of the gas spring is connected with a rack module installed on the fixed seat in a sliding and guiding mode, the rack module comprises a transmission rack, and a rotating gear coaxially rotating with the rotating seat is installed on the rotating seat in a bolt connection mode; the transmission rack and the rotating gear are in transmission connection through a gear transmission mechanism. The gas spring, the rack module and the gear transmission mechanism are connected with the rotating seat in a matched mode, the gas spring provides nearly constant damping force in the stroke, the writing board is made to retract and reset at a constant speed or at a constant speed under the action of gravity, and the writing board has the advantages of being more stable in structure, lower in failure rate and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of auditorium chair, specifically relates to a kind of automatic recycling rotary device for auditorium chair writing board. BACKGROUND

[0002] In order to improve the use convenience of writing board on auditorium chair, the existing writing board is usually provided with automatic return function.

[0003] For example, a kind of chair writing board that can be automatically retracted with patent number ZL202420554712.7, when the writing board needs to be pulled out, manually pull the writing board to make it rotate to the right, and during the rotation, the limit position of the writing board is limited by the limit position of the blocking rod and the main support, when the writing board rotates to the right to the limit, the compression spring moves from the right-up direction to the right-down direction, and then abuts against the position of the rotating support, at this time the compression spring is in the compressed state; Then rotate the writing board back, make the rotating part of the writing board rotate inside the rotating support, during which the extension spiral spring is stretched, after the writing board rotates back, the gravity of the writing board overcomes the spiral spring, and the writing board can only rotate to the horizontal state by the limit of the blocking block and the blocking groove; When the writing board needs to be quickly retracted, the user only needs to stand up directly from the chair seat, the body can push the writing board to restore to the vertical state during the process, and after restoring to the vertical state, the limit of the blocking block and the blocking groove is also removed, at this time the gravity of the writing board will be greater than the elastic force of the compression spring, and then the writing board rotates to the left to retract, and during this process, the compression spring also expands to speed up the return of the writing board, until it restores to the retracted state, realizing the function that the writing board can return to the position by the action of standing up and leaning on the leg after use.

[0004] However, in the technical scheme, the compression spring is a mechanical spring, and the driving force characteristics of the mechanical spring cause a sudden acceleration when the writing board retracts, resulting in a rigid collision between the blocking rod and the main support, not only producing noise, but also causing obvious wear marks on the surface of the blocking rod and the main support due to long-term impact, and even the blocking rod and the main support can be damaged by collision. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of the prior art, the utility model provides an automatic recycling rotary device for auditorium chair writing board.

[0006] The technical scheme adopted by the utility model to solve its technical problems is:

[0007] An automatic recycling rotating device for a church chair writing board, comprising a fixed seat, a rotating seat and a connecting handle, the rotating seat is rotatably installed on the fixed seat by a main installation shaft; the connecting rotating shaft of the connecting handle is rotatably matched on the rotating seat, and a torsional spring is jointly connected between the rotating seat and the connecting rotating shaft; characterized in that: an air spring is installed on the fixed seat, one end of the air spring is connected to the fixed seat, the other end is connected with a rack module slidingly guided and installed on the fixed seat, the rack module comprises a transmission rack, a rotating gear coaxially rotating with the rotating seat is installed on the rotating seat in a bolt connection mode, and the transmission rack and the rotating gear are drivingly connected through a gear transmission mechanism.

[0008] In the utility model, the gear transmission mechanism comprises a first gear connected with the fixed seat through a first wheel shaft and a second gear connected with the fixed seat through a second wheel shaft, the first gear is engaged with the transmission rack, the second gear is engaged with the rotating gear, and the first gear and the second gear are engaged with each other.

[0009] In the utility model, the rack module further comprises at least one rack guide rod, the fixed seat is provided with a linear sliding groove, the rack guide rod is slidingly matched in the linear sliding groove, and the transmission rack is installed on the rack guide rod.

[0010] In the utility model, the rack guide rod is arranged in two and arranged in parallel, the transmission rack is matched with the two rack guide rods simultaneously, the linear sliding groove is two, the two ends of the rack guide rod are inserted into the two linear sliding grooves respectively, and the two ends of the rack guide rod are both sleeved with sliding sleeves sliding in the linear sliding grooves.

[0011] In the utility model, the transmission rack is two and arranged in parallel along the axial direction of the rack guide rod, and the two transmission racks correspond to the rotating gears on the two sides of the rotating seat respectively, and each transmission rack is connected with a rotating gear through a gear transmission mechanism.

[0012] In the utility model, the first gears of the two gear transmission mechanisms are installed on the same first wheel shaft;

[0013] The second gears of the two gear transmission mechanisms are installed on the same second wheel shaft, and the two rotating gears are installed on the opposite sides of the rotating seat respectively;

[0014] The main installation shaft passes through the center hole of the rotating seat and the center hole of the rotating gear.

[0015] In the utility model, the fixed seat is provided with a fixed shaft part, the cylinder body of the air spring is provided with a cylinder body shaft hole through which the fixed shaft part passes, and the piston rod of the air spring is provided with a plug rod shaft hole, and one of the rack guide rods is arranged through the plug rod shaft hole.

[0016] In the utility model, the rotating seat is equipped with the rotating installation groove and the rotating shaft hole which communicate with each other, one end of the connecting shaft is sequentially passed through the rotating shaft hole and the rotating installation groove and is connected with the handle limiting block which rotates coaxially, the torsional spring is located in the rotating installation groove, one torsional arm of the torsional spring is inserted into the follow-up insertion hole of the handle limiting block, and the other torsional arm of the torsional spring is inserted into the fixed insertion hole of the rotating seat.

[0017] In the utility model, the rotating seat is equipped with the rotating limiting groove, the two ends of the rotating limiting groove are the first limiting end and the second limiting end respectively, and the handle shaft limiting part of the connecting handle is equipped with the handle rotating limiting part which is inserted into the rotating limiting groove and moves between the first limiting end and the second limiting end.

[0018] In the utility model, the handle shaft limiting part of the connecting handle is equipped with the unfolding stopper, and the fixed seat is equipped with the unfolding stop groove which is inserted and cooperatively positioned by the unfolding stopper when the writing board is unfolded.

[0019] The utility model discloses the beneficial effects: the utility model discloses air spring, rack module and gear transmission mechanism cooperation and connection rotating seat, wherein, air spring provides near constant damping force in the stroke, makes writing board realize uniform speed or uniform deceleration retraction reset under the action of gravity, compared with the acceleration impact produced in the retraction end period of mechanical spring, the damping effect of air spring of the utility model absorbs kinetic energy, eliminates reset end collision sound, avoids the deformation, wear or fracture of rotating seat and fixed seat due to long -term impact, has the advantages, such as more stable structure, lower failure rate. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model is further illustrated in connection with the drawings and implementation:

[0021] Figure 1 It is the solid of automatic recovery rotating device in writing board recovery state Figure 1 ;

[0022] Figure 2 It is the solid of automatic recovery rotating device in writing board recovery state Figure 2 ;

[0023] Figure 3 It is the sectional view of automatic recovery rotating device in writing board recovery state;

[0024] Figure 4 It is the exploded view of automatic recovery rotating device;

[0025] Figure 5 It is the exploded view of torsional spring, rotating seat and connecting handle;

[0026] Figure 6A perspective view of the automatic recovery rotating device in an unfolded state of the writing board;

[0027] Figure 7 A sectional view of the automatic recovery rotating device in an unfolded state of the writing board. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0029] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0030] In addition, if the embodiments of the present application involve descriptions of "first" or "second" and the like, the descriptions of "first" or "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0031] Referring to Figures 1-7 An automatic recovery rotating device for a writing board of a hall chair, comprising a fixed seat 1, a rotating seat 2 and a connecting handle 3, the rotating seat 2 is rotatably installed on the fixed seat 1 by a main installation shaft 21; the connecting handle 3 comprises a connecting part 31, a handle shaft limiting part 32 and a connecting rotating shaft 33 connected in sequence, wherein the connecting part 31 is used for connecting and installing the writing board 100 by a bolt connection mode, the connecting rotating shaft 33 of the connecting handle 3 is rotatably matched on the rotating seat 2, and the rotating seat 2 and the connecting rotating shaft 33 are jointly connected with a torsion spring 4.

[0032] Further, the fixed seat 1 is provided with a gas spring 5, one end of the gas spring 5 is connected to the fixed seat 1, and the other end is connected with a rack module 6 slidingly mounted on the fixed seat 1, the rack module 6 comprises a transmission rack 61, the rotating seat 2 is provided with a rotating gear 22 coaxially rotating with the rotating seat 2 by bolt connection, the transmission rack 61 and the rotating gear 22 are drivingly connected by a gear transmission mechanism 7, specifically: the gear transmission mechanism 7 comprises a first gear 72 connected to the fixed seat 1 through a first shaft 71 and a second gear 74 connected to the fixed seat 1 through a second shaft 73, the first gear 72 is engaged with the transmission rack 61, the second gear 74 is engaged with the rotating gear 22, and the first gear 72 and the second gear 74 are engaged with each other.

[0033] The above structure adopts the cooperation of the gas spring 5, the rack module 6 and the gear transmission mechanism 7 to connect the rotating seat 2, wherein the gas spring 5 provides a nearly constant damping force in the stroke, so that the writing board 100 realizes uniform speed or uniform deceleration retraction under the action of gravity, compared with the acceleration impact generated by the mechanical spring at the end of retraction, the damping effect of the gas spring 5 absorbs kinetic energy, eliminates the collision sound at the end of reposition, avoids deformation, wear or fracture of the rotating seat 2 and the fixed seat 1 due to long-term impact, and has the advantages of more stable structure, lower failure rate and the like.

[0034] In the embodiment, the fixed seat 1 is provided with a fixed cavity, and the rotating seat 2, the gas spring 5, the rack module 6 and the gear transmission mechanism 7 are located in the fixed cavity, so that the fixed seat 1 also plays a certain protective role on the above structure.

[0035] As a preferred embodiment, the rack module 6 further comprises at least one rack guide rod 62, the fixed seat 1 is provided with a linear sliding groove 11 extending from left to right, the rack guide rod 62 is slidingly fitted in the linear sliding groove 11, and the transmission rack 61 is mounted on the rack guide rod 62, and the rack guide rod 62 is used for slidingly guiding the transmission rack 61. Further, the rack guide rod 62 has two and is arranged, and the transmission rack 61 is matched with the two rack guide rods 62 at the same time.

[0036] In the embodiment, the straight sliding grooves 11 are two and symmetrically arranged, the two ends of the rack guide rod 62 are respectively inserted into the two straight sliding grooves 11, the two ends of the rack guide rod 62 are sleeved with sliding sleeves 63 sliding in the straight sliding grooves 11, the small-diameter end of the sliding sleeve 63 is slidingly fitted in the straight sliding groove 11, and the large-diameter end of the sliding sleeve 63 is located between the fixed seat 1 and the transmission rack 61, so that the transmission rack 61 is prevented from rubbing against the fixed seat 1. Further, the two ends of the rack guide rod 62 are provided with guide rod screw holes, the guide rod screw holes are threadedly connected with guide rod bolts, and the sliding sleeve 63 is limited between the guide rod bolts and the transmission rack 61.

[0037] In the embodiment, the transmission racks 61 are two and arranged along the axial direction of the rack guide rod 62, and a guide rod spacer is arranged between the two transmission racks 61. The guide rod spacer is sleeved on the rack guide rod 62 and is used to keep the relative position between the two transmission racks 61. The guide rod spacer is not shown in the drawings.

[0038] Further, the two transmission racks 61 correspond to the rotating gears 22 on the two sides of the rotating seat 2 respectively, each transmission rack 61 is connected with a rotating gear 22 through a gear transmission mechanism 7. Specifically, the first gears 72 of the two gear transmission mechanisms 7 are installed on the same first shaft 71, a first spacer is arranged between the two first gears 72 and sleeved on the first shaft 71, so that the two first gears 72 keep a relative distance. The first shaft 71 is provided with a first shaft sleeve 75 corresponding to each first gear 72, the first gear 72 is sleeved on the small-diameter end of the first shaft sleeve 75, and the large-diameter end of the first shaft sleeve 75 is located between the first gear 72 and the fixed cavity wall, so that friction is avoided between the first gear 72 and the fixed cavity wall. The second gears 74 of the two gear transmission mechanisms 7 are installed on the same second shaft 73, a second spacer is arranged between the two second gears 74 and sleeved on the second shaft 73, so that the two second gears 74 keep a relative distance. The second shaft 73 is provided with a second shaft sleeve 76 corresponding to each second gear 74, the second gear 74 is sleeved on the small-diameter end of the second shaft sleeve 76, and the large-diameter end of the second shaft sleeve 76 is located between the second gear 74 and the fixed cavity wall, so that friction is avoided between the second gear 74 and the fixed cavity wall. In addition, the two ends of the first shaft 71 and the second shaft 73 are provided with fixed bolts matched with the fixed seat 1. The fixed bolts, the first spacer and the second spacer are not shown in the drawings.

[0039] In the embodiment, two rotating gears 22 are respectively installed on opposite sides of the rotating seat 2, the main mounting shaft 21 passes through the center hole of the rotating seat 2 and the center hole of the rotating gear 22, and the two ends of the main mounting shaft 21 are both installed with main bolts fixedly matched with the fixed seat 1; specifically, the main mounting shaft 21 is sleeved with two main shaft sleeves 23 corresponding to the two rotating gears 22 respectively, the small-diameter end of the main shaft sleeve 23 is sequentially inserted into the center hole of the rotating gear 22 and the center hole of the rotating seat 2, and the large-diameter end of the main shaft sleeve 23 is located between the rotating gear 22 and the cavity wall of the fixed cavity, so as to avoid direct friction between the rotating gear 22 and the fixed seat 1.

[0040] In the embodiment, the fixed seat 1 is provided with a fixed shaft part 12, and the cylinder body of the gas spring 5 is provided with a cylinder body shaft hole through which the fixed shaft part 12 passes, so that the gas spring 5 is rotatably connected with the fixed seat 1; specifically, the fixed shaft part 12 is threadedly connected with a fixed bolt for limiting the fixed shaft part 12 from being separated from the cylinder body shaft hole, and the fixed bolt is threadedly matched in a fixed screw hole of the fixed shaft part 12; the piston rod of the gas spring 5 is provided with a plug rod shaft hole, one of the rack guide rods 62 passes through the plug rod shaft hole, so as to realize the rotatable connection between the gas spring 5 and the rack module 6.

[0041] In the embodiment, the rotating seat 2 is provided with a rotating installation groove 201 and a rotating shaft hole 202 which are in communication with each other, one end of the connecting shaft 33 is sequentially connected with a handle limiting block 8 which rotates coaxially with the connecting shaft 33 after passing through the rotating shaft hole 202 and the rotating installation groove 201; the handle limiting block 8 is fixedly installed on the connecting shaft 33 in a bolt connection manner, the handle limiting block 8 and the handle axial limiting part 32 jointly limit the axial movement of the connecting shaft 33 along the rotating shaft hole 202, so as to limit the connecting shaft 33 from being separated from the rotating installation groove 201 and the rotating shaft hole 202, and the rotating shaft hole 202 is used for guiding the rotation of the connecting shaft 33. The torsional spring 4 is located in the rotating installation groove 201 and is sleeved outside the connecting shaft 33, one torsional arm of the torsional spring 4 is inserted into a follow-up insertion hole of the handle limiting block 8, and the other torsional arm of the torsional spring 4 is inserted into a fixed insertion hole of the rotating seat 2, so as to realize the installation of the torsional spring 4.

[0042] In the embodiment, the D-shaped part of the connecting shaft 33 is matched in the D-shaped hole of the handle limiting block 8, so that the handle limiting block 8 and the connecting shaft 33 rotate coaxially, and one end of the rotating seat 2 away from the rotating shaft hole 202 is also provided with a rotating groove 203 for guiding the rotation of the handle limiting block 8, the rotating groove 203 is arranged in communication with the rotating installation groove 201, so as to ensure the stability of the rotation of the connecting handle 3 relative to the rotating seat 2.

[0043] In the embodiment, the rotating seat 2 comprises a rotating body 24 and a rotating cover 25 which are combined and installed together by means of bolt connection, wherein the rotating installation groove 201 and the rotating groove 203 are arranged on the rotating body 24, and the rotating shaft hole 202, the fixed insertion hole and the rotating limiting groove 204 are arranged on the rotating cover 25.

[0044] In the embodiment, the rotating seat 2 is provided with the rotating limiting groove 204, two ends of the rotating limiting groove 204 are respectively a first limiting end and a second limiting end, the handle shaft limiting part 32 is provided with the handle rotating limiting part 321 which is inserted into the rotating limiting groove 204 and moves between the first limiting end and the second limiting end; when the handle rotating limiting part 321 abuts against the first limiting end, the writing board 100 is in a vertical state; when the handle rotating limiting part 321 abuts against the second limiting end, the writing board 100 is in a horizontal state.

[0045] In the embodiment, the handle shaft limiting part 32 is provided with the unfolding stop block 322, the fixed seat 1 is provided with the unfolding stop groove 13 which is used for inserting and cooperating with the unfolding stop block 322 to limit the position of the writing board 100 when the writing board 100 is unfolded.

[0046] When the writing board 100 needs to be pulled out, the user manually pulls the writing board 100 to rotate the rotating seat 2 synchronously to the right, when the sliding sleeve 63 of one of the rack guiding rods 62 abuts against the leftmost end of the linear sliding groove 11, the unfolding rotation limit position of the writing board 100 is realized, in the process, the rotating gear 22 drives the transmission rack 61 to move leftwards through the gear transmission mechanism 7, and the piston rod of the gas spring 5 returns to the retracted state; then the writing board 100 is rotated backwards again, the connecting rotating shaft 33 rotates relative to the rotating seat 2, and the torsion spring 4 is energized, after the writing board 100 is rotated backwards, the gravity of the writing board 100 overcomes the torsion spring 4, and the writing board 100 can only be rotated to the horizontal state through the unfolding stop block and the unfolding stop groove 13;

[0047] When the writing board 100 needs to be quickly retracted, the user only needs to stand up directly from the seat, and the body can push the writing board 100 to be restored from horizontal rotation to vertical state (even if it is not directly pushed to the vertical state, after the writing board 100 rotates to a certain extent, the gravity thereof can no longer overcome the torsional spring 4, so that the torsional spring 4 drives the writing board 100 to automatically restore the vertical state), and after being restored to the vertical state, the unfolding block is separated from the unfolding block slot 13, at this time, the gravity of the writing board 100 makes the writing board 100 rotate rightward and downward to be retracted, the piston rod of the gas spring 5 slowly extends, and the risk of violent collision of the writing board 100 in the rotation reset is reduced; until the sliding sleeve 63 of the other rack guide rod 62 abuts against the most right end of the linear sliding slot 11, the writing board 100 is reset to the retracted state. In the above process, the user only needs to stand up to automatically complete the retraction work of the writing board 100, and the convenience of using the writing board 100 is effectively improved.

[0048] The preferred embodiments of the present application are described above, and any technical solutions achieving the same purpose by basically the same means should be within the protection scope of the present application.

Claims

1. An automatic recycling rotating device for auditorium chair writing board, comprising a fixed seat (1), a rotating seat (2) and a connecting handle (3), the rotating seat (2) is rotatably installed on the fixed seat (1) by a main installation shaft (21); the connecting rotating shaft (33) of the connecting handle (3) is rotatably matched on the rotating seat (2), and the rotating seat (2) and the connecting rotating shaft (33) are jointly connected with a torsional spring (4); characterized in that: The fixed seat (1) is provided with a gas spring (5), one end of the gas spring (5) is connected to the fixed seat (1), and the other end is connected to a rack module (6) slidingly guided and mounted on the fixed seat (1), the rack module (6) comprises a transmission rack (61), the rotating seat (2) is provided with a rotating gear (22) coaxially rotating therewith by bolt connection, and the transmission rack (61) and the rotating gear (22) are drivingly connected by a gear transmission mechanism (7). ​ 2. An automatic return swivel for auditorium chair writing tablets according to claim 1, characterized in that: The gear transmission mechanism (7) comprises a first gear (72) connected to the fixed seat (1) by a first shaft (71) and a second gear (74) connected to the fixed seat (1) by a second shaft (73), the first gear (72) is engaged with the transmission rack (61), the second gear (74) is engaged with the rotating gear (22), and the first gear (72) and the second gear (74) are engaged with each other.

3. An automatic return swivel for auditorium chair writing tablets as defined in claim 1 wherein: The rack module (6) further comprises at least one rack guide rod (62), the fixed seat (1) is provided with a linear sliding groove (11), the rack guide rod (62) is slidingly fitted in the linear sliding groove (11), and the transmission rack (61) is mounted on the rack guide rod (62).

4. An automatic return swivel for auditorium chair writing tablets according to claim 3, characterized in that: The rack guide rod (62) has two and is arranged, the transmission rack (61) is matched with the two rack guide rods (62) at the same time; the linear sliding groove (11) has two, the two ends of the rack guide rod (62) are inserted into the two linear sliding grooves (11) respectively, and the two ends of the rack guide rod (62) are sleeved with sliding sleeves (63) sliding in the linear sliding grooves (11).

5. An automatic return swivel device for a pew desk according to claim 3 or 4, characterized in that: The transmission rack (61) has two and is arranged along the axial direction of the rack guide rod (62), the two transmission racks (61) correspond to the rotating gears (22) on the two sides of the rotating seat (2) respectively, and each transmission rack (61) is connected with a rotating gear (22) by a gear transmission mechanism (7).

6. An automatic return swivel for auditorium chair writing tablets according to claim 5, characterized in that: The first gears (72) of the two gear transmission mechanisms (7) are mounted on the same first shaft (71); The second gears (74) of the two gear transmission mechanisms (7) are mounted on the same second shaft (73); the two rotating gears (22) are mounted on the opposite sides of the rotating seat (2) respectively; The main mounting shaft (21) passes through the center hole of the rotating seat (2) and the center hole of the rotating gear (22).

7. An automatic return swivel for auditorium chair writing tablets according to claim 4, wherein: The fixed seat (1) is provided with a fixed shaft portion (12), the cylinder body of the gas spring (5) is provided with a cylinder shaft hole through which the fixed shaft portion (12) passes; the piston rod of the gas spring (5) is provided with a plug rod shaft hole, and one of the rack guide rods (62) is arranged through the plug rod shaft hole.

8. The automatic retractable swivel mechanism for auditorium chair writing tablets of claim 1 wherein: The rotating seat (2) is provided with a rotating installation slot (201) and a rotating shaft hole (202) in communication with each other, one end of the connecting rotating shaft (33) passes through the rotating shaft hole (202) and the rotating installation slot (201) in sequence and is connected with a handle limiting block (8) coaxially rotating with the connecting rotating shaft (33); the torsional spring (4) is located in the rotating installation slot (201), one torsional arm of the torsional spring (4) is inserted into a follow-up insertion hole of the handle limiting block (8), and the other torsional arm of the torsional spring (4) is inserted into a fixed insertion hole of the rotating seat (2).

9. An automatic return swivel for auditorium chair writing tablets according to claim 8, characterized in that: The rotating seat (2) is provided with a rotating limiting slot (204), both ends of the rotating limiting slot (204) are respectively a first limiting end and a second limiting end, and the handle axial limiting part (32) of the connecting handle (3) is provided with a handle rotating limiting part (321) inserted into the rotating limiting slot (204) and movably located between the first limiting end and the second limiting end.

10. The automatic retractable swivel mechanism for auditorium chair writing tablets of claim 1, wherein: The handle axial limiting part (32) of the connecting handle (3) is provided with an unfolding stop block (322), and the fixed seat (1) is provided with an unfolding stop slot (13) for inserting and cooperating with the unfolding stop block (322) to position when the writing board (100) is unfolded.

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