An auditorium chair

Abstract

An auditorium chair solves the problems of heavy structure, inconvenient operation and troublesome installation of existing auditorium chairs. The front end of the round rod is axially arranged horizontally on the writing board, and the rear end is provided with a cylindrical guide block fixed vertically thereto; the armrest is provided with a receiving cavity opening forward, a buffer block arranged in the receiving cavity, and a rotating body arranged in the receiving cavity for horizontal rotation; the rotating body is provided with a round hole suitable for the rear end of the round rod to be inserted and whose axial direction is perpendicular to the axial direction of the rotating body, and a guide hole for the guide block to rotate through; the guide hole is provided at the top of the rotating body and communicates with the round hole; when the writing board is placed horizontally, the rear end of the round rod is located outside the round hole and abuts against the armrest, and the axial direction of the guide block is horizontal and abuts against the rotating body; when the writing board is placed vertically, the rear end of the round rod is located in the round hole, and the axial direction of the guide block is vertical; when the writing board is located in the receiving cavity, the top surface of the buffer block abuts against the edge surface of the writing board; the top surface of the armrest is provided with a card entrance communicated with the receiving cavity, and the armrest board is provided with a card block that can be carded into the card entrance.

Description

Technical Field

[0001] The invention belongs to the technical field of office furniture, and in particular relates to an auditorium chair. Background Art

[0002] Auditorium chairs are mostly composed of four parts: seat, backrest, armrest and footrest, which are suitable for auditoriums, theaters, lecture halls and other places. In general, the footrest and armrest are integrated to form a firmly installed armrest frame, and its structure is generally steel-wood structure or steel-plastic structure.

[0003] According to the needs of use, auditorium chairs used in halls and the like need to be provided with writing boards (or writing boards) for placing documents and taking notes. Auditorium chairs in the prior art generally adopt a structural design for rotating and storing writing boards. For example, some auditorium chairs store writing boards inside the armrests, and the armrests are designed to be rotatably connected to the top of the armrests. When in use, the armrests are flipped to the left or right, and then the writing board is taken out from the armrests by rotating. The support rod at the bottom of the writing board is rotated until it presses against the armrests, so that the armrests can effectively support the writing board, thereby prompting the writing board to be placed horizontally on the front side of the armrests, and then the writing board is rotated from a vertical state to a horizontal state for placing documents or taking notes.

[0004] However, this auditorium chair has a heavy structure, is inconvenient to operate, and is costly. It often requires the design of a rotating mechanism to realize the rotational connection of the armrest to the armrest. The armrest needs to be flipped open when taking and placing the writing board, which is very inconvenient. In addition, a relatively complex rotating connection mechanism is used between the support rod and the writing board to realize the rotation of the writing board relative to the support rod and realize the snap connection, thereby realizing the rotation of the writing board from a vertical state (not in use) to a horizontal state (in use).

[0005] Moreover, the armrest panels (or armrest covers) are generally made of beech wood and coated with high-grade polyester paint on the outside. If the surface of the armrest panel is damaged and needs to be disassembled and replaced, it will take a lot of time and maintenance is very inconvenient.

[0006] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an auditorium chair with a simple and feasible structure, a novel and unique design, stable and reliable operation, easy use, easy disassembly and assembly, greatly saving materials, low cost, beautiful and durable, aiming to solve the problems of heavy structure, inconvenient operation and troublesome installation of auditorium chairs in the prior art.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] An auditorium chair, comprising a chair back, a chair seat, an armrest, a footrest and a writing board arranged in front of the armrest; the armrest is provided with an armrest board; wherein,

[0010] The writing board is provided with a round rod; the front end of the round rod is fixed to the bottom of the writing board in an axial horizontal manner; the rear end of the round rod is provided with a cylindrical guide block with one end vertically fixed thereto;

[0011] The handrail is provided with a receiving cavity with an advanced opening, a buffer block fixed to the receiving cavity, and a rotating body horizontally rotatably arranged in the receiving cavity;

[0012] The rotating body is provided with a round hole suitable for the rear end of the round rod to be inserted, and a guide hole for the guide block to rotate through; the axial direction of the round hole is perpendicular to the axial direction of the rotating body; the guide hole is provided at the top of the rotating body and communicates with the round hole;

[0013] When the writing board is in use, the rear end of the round rod is located outside the round hole and abuts against the handrail, and the guide block is in an axially horizontal state and abuts against the rotating body;

[0014] When the writing board is swung upward by 90° to switch to a non-use state, the rear end of the round rod is located in the round hole, and the guide block is in an axially vertical state;

[0015] When the writing board is located in the accommodating cavity, the top surface of the buffer block abuts against the edge surface of the writing board;

[0016] The top surface of the armrest is provided with a card entrance communicated with the accommodating cavity, and the bottom surface of the armrest plate is provided with a card block which can be carded in the card entrance.

[0017] In the auditorium chair, the armrest is provided with a seat fixed to the accommodating cavity; the seat is provided with a cylindrical cavity, and the rotating body is coaxially arranged in the cavity; the bottom of the seat is provided with an opening that is communicated with the cavity and is convenient for the round rod to pass through; when the writing board is in use, the rear end of the round rod is clamped in the opening.

[0018] In the auditorium chair, viewed from the axial direction of the cavity, the seat is circular and the opening is semicircular.

[0019] In the auditorium chair, the outer peripheral surface of the rotating body is in contact with the inner peripheral surface of the cavity; and the width of the opening is suitable for the diameter of the round rod.

[0020] In the auditorium chair, the guide block is a screw rod, and the round rod is correspondingly provided with a screw hole suitable for threaded connection with the guide block.

[0021] In the auditorium chair, the guide block is made of metal material.

[0022] In the auditorium chair, the buffer block is made of rubber.

[0023] In the auditorium chair, the top surface of the buffer block is an arc-shaped surface.

[0024] In the auditorium chair, a mounting groove suitable for inserting a round rod is provided at the bottom of the writing board, and the round rod is provided with a fixing plate integrally connected thereto and located below the mounting groove, and the fixing plate is fixedly connected to the bottom surface of the writing board.

[0025] In the auditorium chair, the clamping block is integrally composed of an inverted L-shaped connecting portion and an inverted V-shaped clamping portion, the connecting portion is fixed to the bottom surface of the armrest plate, and one end of the clamping portion is connected to the bottom end of the connecting portion; when the clamping portion is inserted into the clamping entrance and abuts against the inner wall surface of the accommodating cavity located above, the bottom surface of the armrest plate fits with the top surface of the armrest.

[0026] Beneficial effects:

[0027] The present invention provides an auditorium chair with a simple and feasible structure, a novel and unique design, stable and reliable operation, simple use, easy disassembly and assembly, greatly saving materials, low cost, beautiful appearance and durability, and aims to solve the problems of heavy structure, inconvenient operation and troublesome installation of auditorium chairs in the prior art.

[0028] The present invention adopts a rotating body with a unique structure, and a guide block is fixed on the round rod for supporting the writing board. Through the cooperation of the guide block and the guide hole provided on the rotating body, and the round rod and the round hole provided on the rotating body, the round rod and the guide block are rotated while causing the round rod and the guide block to be displaced in the front-back direction, thereby completing the clamping and unclamping work between the round rod and the armrest. In addition, a accommodating cavity with an opening facing forward is provided on the armrest, so that the writing board can be stored in the accommodating cavity in a vertical state. The operation is simple, and there is no need to open the armrest board, so as to avoid affecting people sitting in adjacent positions when taking and placing the writing board. Through such a sophisticated structural design, the overall structure of the auditorium chair can be greatly simplified, saving materials and reducing costs.

[0029] Moreover, a card entrance communicating with the accommodating cavity is provided on the top surface of the armrest, and the card block provided on the armrest plate is correspondingly inserted into the card entrance, so that the armrest plate is carded onto the armrest, which is convenient for disassembly and assembly and easy for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural explosion diagram of the auditorium chair provided by the present invention.

[0031] Figure 2 This is a structural stereogram of the auditorium chair provided by the present invention.

[0032] Figure 3An exploded view of the structure in which a writing board and a round rod are connected in the auditorium chair provided by the present invention.

[0033] Figure 4 The present invention is a schematic diagram showing the operation of the rotating body and the round rod in the auditorium chair when the writing board is in use.

[0034] Figure 5 The present invention is a schematic diagram showing the operation of the rotating body and the round rod in the auditorium chair when the writing board is not in use.

[0035] Figure 6 The present invention provides an auditorium chair, in which the rotating body and the round rod are connected to the card seat when the writing board is in use.

[0036] Figure 7 for Figure 6 Cross-sectional view of section AA.

[0037] Figure 8 A structural stereogram of the auditorium chair provided by the present invention, in which the rotating body and the round rod are connected to the card seat when the writing board is in use.

[0038] Fig. 9 This is a structural stereogram of a rotating body in the auditorium chair provided by the present invention.

[0039] Fig.10 The present invention provides a schematic diagram of the working state of a writing board and a buffer card block in a receiving cavity of an auditorium chair.

[0040] Fig.11 The present invention provides a schematic structural diagram of an armrest plate and a clamping block in an auditorium chair.

[0041] Fig.12 The present invention provides a schematic diagram of the working state of the clamping block in the auditorium chair. DETAILED DESCRIPTION

[0042] The present invention provides an auditorium chair. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0043] It should be noted that the determination of the position in the present invention is as follows: Figure 2 As shown, the front of the chair back is the front, the back of the chair back is the back, and the use surface of the writing board is the top (or the top).

[0044] See also Figure 1 , Figure 2 , Fig.10The present invention provides an auditorium chair, which is composed of a chair back 1, a chair seat 2, an armrest, a standing foot 33 and a writing board 5 arranged in front of the armrest, and the armrest is provided with an armrest board 31. The armrest is composed of an armrest seat 32, an armrest board 31 fixed to the top of the armrest seat 32, the standing foot 33 is fixedly connected to the bottom of the armrest seat 32, and the standing foot 33, the armrest board 31 and the armrest seat 32 constitute an armrest frame 3, and the chair back 1 and the chair seat 2 are fixedly connected to the inner side of the armrest frame 3.

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Fig.10 As shown, the writing board 5 is provided with a round rod 6; the front end of the round rod 6 is fixed to the bottom of the writing board 5 in an axial horizontal manner; the rear end of the round rod 6 is provided with a cylindrical guide block 62 with one end vertically fixed thereto.

[0046] Moreover, the armrest seat 32 of the armrest is provided with a receiving cavity 325 with an opening facing forward, a buffer block 9 fixed to the receiving cavity 325, and a rotating body 7 horizontally rotatably provided in the receiving cavity 325. The rotating body 7 is provided with a round hole 72 suitable for the rear end of the round rod 6 to be inserted, and a guide hole 71 for the guide block 62 to rotate through; the axial direction of the round hole 72 is perpendicular to the axial direction of the rotating body 7. In this embodiment, the axis of the round hole is coplanar with the axis of the rotating body. The guide hole 71 is provided at the top of the rotating body 7 and communicates with the round hole 72.

[0047] like Figure 1 , Figure 3 , Figure 4 , Fig. 9 As shown, when the writing board 5 is in use, the rear end of the round rod 6 is located outside the round hole 72 and abuts against the handrail, and the guide block 62 is in an axially horizontal state and abuts against the rotating body 7. The round rod 6 and the writing board 5 are in a stable horizontal state because the top surface of the rear end of the round rod 6 is under pressure (or obstruction) from the handrail, thereby preventing the rotating body 7 from rotating when the writing board is in use and causing the writing board to swing down. The guide block 62 is effectively supported by the support surface 73 of the rotating body 7 and prevents the guide block 62 from further rotating, thereby ensuring that the writing board is in a horizontal state and does not swing down.

[0048] The support surface 73 may be a plane. When viewed from a top view, the support surface falls outside the projection range of the circular hole 72 .

[0049] like Figure 3 , Figure 4 , Figure 5 , Fig.10As shown, when the writing board 5 is swung up 90° in a horizontal state (from a front view, the writing board rotates 90° counterclockwise) to switch to a non-use state, the rear end of the round rod 6 is located in the round hole 72, and the guide block 62 is in an axial vertical state. After the guide block 62 rotates along the wall of the guide hole 71, the guide block 62 and the round rod 6 not only rotate 90°, but also move forward at the same time, prompting the round rod 6 to move from outside the round hole 72 to inside the round hole 72, thereby releasing the abutment between the rear end of the round rod 6 and the armrest. Therefore, the rotating body 7 can rotate to allow the writing board 5 to swing in a vertical state until it is received in the accommodating cavity 325 of the armrest.

[0050] like Fig.10 As shown, when the writing board 5 is located in the accommodating cavity 325, the top surface of the buffer block 9 abuts against the edge surface of the writing board 5. The writing board 5 swings in a vertical state until it contacts the top surface of the buffer block 9, so as to prevent the writing board from hitting the wall surface of the accommodating cavity 325 of the armrest when swinging downward. At this time, the buffer block 9 generates elastic deformation and always keeps in contact with the writing board 5, so that the writing board 5 remains stationary when there is no external force.

[0051] When it is necessary to take out the writing board 5, one can reach into the accommodating cavity 325 with one's hand, clamp the writing board 5 and apply sufficient external force to overcome the obstruction imposed by the buffer block on the writing board, so that the writing board 5 can swing upward. When the round rod 6 is in a horizontal state, the writing board is swung down 90°, and the handrail obstructs the rear end of the round rod 6 and the rotating body 7 obstructs the guide block 62, so that the writing board can be placed horizontally.

[0052] The present invention directly fixes the round rod 6 used to support the writing board 5 to the writing board. Compared with the auditorium chair in the prior art, the present invention saves the rotating connection structure, simplifies the overall structure, and reduces the weight. In addition, a guide block 62 is vertically fixed at the rear end of the round rod 6, and a rotatable rotating body 7 is set in the accommodating cavity 325 of the armrest. The rotating body 7 can drive the round rod 6 to rotate synchronously to realize the forward and backward swing of the writing board. The rotating body 7 is provided with a guide hole 71 corresponding to the guide block 62, so that the guide block 62 rotates along the wall of the guide hole 71 when the round rod 6 rotates, so as to realize the position of the round rod 6 in the forward and backward direction, thereby ensuring that the writing board is in a horizontal state for use by means of the action force between the round rod and the armrest. It is very easy and convenient to take and put the writing board, and the operation is simple. There is no need to operate the armrest board, which simplifies the structure of the armrest and greatly saves manufacturing materials.

[0053] like Figure 1As shown, the top surface of the armrest is provided with a card entrance 322 communicating with the accommodating cavity 325, and the bottom surface of the armrest board 31 is provided with a card block 4 that can be carded into the card entrance 322. The armrest board 31 is directly mounted on the armrest by the card block 4 in a card-connected manner, and there is no need to set a complex rotating mechanism to realize the rotation of the armrest board 31 relative to the armrest to facilitate the removal of the writing board 5; moreover, the armrest board is easy to disassemble and assemble, which is convenient for maintenance.

[0054] like Figure 1 , Fig.11 , Fig.12 As shown, specifically, the clamping block 4 is integrally composed of an inverted L-shaped connecting portion 41 and an inverted V-shaped clamping portion 42. In this embodiment, the clamping block 4 is made of a metal spring. The top of the connecting portion 41 is fixed to the bottom surface of the armrest plate 31 by screws, and one end of the clamping portion 42 is connected to the bottom end of the connecting portion 41.

[0055] When the clamping portion 42 is inserted into the clamping entrance 322 and abuts against the inner wall surface of the accommodating cavity 325 located at the top (i.e., the bottom surface of the top plate 321 of the armrest), the bottom surface of the armrest plate 31 fits with the top surface of the armrest (i.e., the top surface of the top plate 321 of the armrest). Fig.12 shown.

[0056] After the armrest board 31 is clamped to the armrest seat 32, the top plate 321 of the armrest is in surface contact with the armrest board 31, which effectively supports the armrest board 31 and enables the armrest board to maintain a stable state.

[0057] like Figure 1 , Fig.11 , Fig.12 As shown in FIG. 1 , the inner angle of the clamping portion 42 ranges from 90° to 120°. Fig.12 From the perspective of the embodiment, when the armrest board 31 is installed on the armrest seat 32, the armrest board 31 is moved to the lower left and the clamping portion 42 is correspondingly inserted into the clamping inlet 322. During the process, the clamping portion 42 is elastically deformed due to the force of the top plate 321 of the armrest, so that the inner angle of the clamping portion 42 increases, so that the armrest board 31 can be fixed on the armrest seat 32 through the clamping action of the clamping block 4 and the top plate 321 of the armrest. At this time, the clamping portion 42 returns to its original shape, and because the bottom surface of the top plate 321 of the armrest abuts against the top of the clamping portion 42, the armrest board cannot be easily lifted up directly to separate it from the armrest seat.

[0058] like Fig.11 , Fig.12As shown, when the armrest plate 31 needs to be removed, the armrest plate 31 is moved upward. During the upward movement, the clamping portion 42 will be elastically deformed due to the pressure of the top plate 321 of the armrest. At the same time, the armrest plate is moved to the right, and the clamping portion 42 can be pulled out from the clamping entrance, thereby easily completing the disassembly of the armrest plate.

[0059] like Fig.12 As shown, the support leg 33 is provided with a connection hole 331 suitable for being bolted to the ground. When the armrest chair is installed on the ground, bolts are used to pass through the connection hole 331 to tightly fix the support leg 33 to the ground.

[0060] like Figure 1 , Figure 3 , Figure 6 , Figure 7 , Figure 8 As shown, specifically, the armrest is provided with a holder 8 fixed to the accommodating cavity 325; the holder 8 is provided with a cylindrical cavity 81, and the rotating body 7 is coaxially arranged in the cavity 81; the bottom of the holder 8 is provided with an opening 82 which is communicated with the cavity 81 and is convenient for the round rod 6 to pass through; when the writing board 5 is in use, the rear end of the round rod 6 is clamped in the opening 82.

[0061] The opening 82 is provided not only for clamping with the rear end of the round rod 6 and applying downward pressure to the rear end of the round rod to ensure that the horizontal and motionless round rod can effectively support the writing board, but also to avoid obstruction to the round rod 6 when the writing board 5 is lowered to be stored in the accommodating cavity 325 of the armrest.

[0062] The holder 8 can be fixed to the handrail by welding or bolts.

[0063] Of course, in addition to providing the holder 8, a card plate can also be provided at an appropriate position, which, like the holder, can apply downward pressure to the rear end of the round rod 6 so that the round rod can remain horizontal and motionless when using the writing board.

[0064] like Figure 3 , Figure 6 , Figure 8 As shown, from the axial direction of the cavity 81, the card seat 8 is circular, and the opening 81 is semicircular. Of course, the card seat 8 can also be square, and the opening is U-shaped. In addition, it can also be other shapes. In this embodiment, a circular card seat is preferred. In addition, the card seat 8 can be made of metal materials, such as iron, aluminum, stainless steel, etc. Similarly, the round rod 6 is made of metal material.

[0065] Specifically, the outer circumference of the rotating body 7 is in contact with the inner circumference of the cavity 81. With such a design, the rotating body does not need to be connected to the handrail, and can be directly inserted into the cavity 81 of the fixed holder 8, so that it can rotate freely relative to the holder 8 and the handrail. Moreover, the width of the opening 82 is suitable for the diameter of the round rod 6. With such a structural design, the round rod 6 and the rotating body 7 can be prevented from moving in the left and right directions. Therefore, the installation work is greatly simplified.

[0066] like Figure 4 , Figure 5 , Figure 7 As shown, in this embodiment, the guide block 62 is a screw rod, and the round rod 6 is correspondingly provided with a screw hole (not marked in the figure) suitable for threaded connection with the guide block 62. In terms of installation and disassembly, when the round rod 6 is rotated so that the axial direction of the guide block 62 is vertical, the guide block 62 can be screwed out using a tool, and the round rod 6 can be taken out from the round hole 72, without the need to disassemble the installed rotating body 7, the holder 8, etc., which greatly reduces the difficulty of installation and disassembly. Specifically, the guide block 62 is made of metal material, such as iron, carbon steel, etc. In this embodiment, a hexagon socket screw is used.

[0067] like Fig.10 As shown, specifically, the buffer block 9 is made of rubber. When the writing board 5 is lowered to be placed in the accommodating cavity 325, the edge surface of the writing board 5 contacts the top surface of the buffer block 9, and the writing board 5 stops and remains stable due to the friction of the buffer block 9. Of course, it can also be made of other materials. In this embodiment, the top surface of the buffer block 9 is set as an arc surface, so that the lowest point of the edge surface of the writing board 5 located in the accommodating cavity 325 contacts the highest point of the buffer block 9, which is convenient for taking out the writing board easily.

[0068] like Figure 2 , Figure 3 As shown, the bottom of the writing board 5 is provided with a mounting groove 51 suitable for the round rod 6 to be placed therein, and the round rod 6 is provided with a fixing plate 61 integrally connected therewith and located below the mounting groove 51, and the fixing plate 61 is fixedly connected to the bottom surface of the writing board 5 by screw connection. The fixing plate 61 can be fixed to the round rod 6 by welding. The present invention directly fixes the writing board 5 and the round rod 6, and the writing board is driven to rotate by the round rod, without the need for a complex rotating connection mechanism between the round rod and the writing board, and has a simple structure, fast installation, and low cost.

[0069] In the present invention, if Figure 2The figure only schematically shows that the writing board is arranged on the left side of the auditorium chair. The writing board can be arranged on the right side of the auditorium chair according to actual needs. In addition, since the auditorium chairs are arranged side by side, in order to save the installation space and materials of the auditorium, the adjacent auditorium chairs generally share an armrest. Then, in the actual application of the present invention, the writing board can be installed in the form of an array on the front side of each armrest so that everyone can use the writing board. Compared with the existing auditorium chairs, the ingenious design of the present invention allows people to take and put the writing board without opening the armrest board, so it will not affect the people sitting in the adjacent position.

[0070] In summary, the present invention provides an auditorium chair with a simple and feasible structure, a novel and unique design, stable and reliable operation, easy use, easy disassembly and assembly, greatly saving materials, low cost, beautiful and durable, and aims to solve the problems of heavy structure, inconvenient operation and troublesome installation of auditorium chairs in the prior art.

[0071] The present invention adopts a rotating body with a unique structure, and a guide block is fixed on the round rod for supporting the writing board. Through the cooperation of the guide block and the guide hole provided on the rotating body, and the round rod and the round hole provided on the rotating body, the round rod and the guide block are rotated while causing the round rod and the guide block to be displaced in the front-back direction, thereby completing the clamping and unclamping work between the round rod and the armrest. In addition, a accommodating cavity with an opening facing forward is provided on the armrest, so that the writing board can be stored in the accommodating cavity in a vertical state. The operation is simple, and there is no need to open the armrest board, so as to avoid affecting people sitting in adjacent positions when taking and placing the writing board. Through such a sophisticated structural design, the overall structure of the auditorium chair can be greatly simplified, saving materials and reducing costs.

[0072] Moreover, a card entrance communicating with the accommodating cavity is provided on the top surface of the armrest, and the card block provided on the armrest plate is correspondingly inserted into the card entrance, so that the armrest plate is carded onto the armrest, which is convenient for disassembly and assembly and easy for maintenance.

[0073] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. An auditorium chair, comprising a chair back, a chair seat, an armrest, a footrest and a writing board arranged in front of the armrest; the armrest is provided with an armrest board; characterized in that: The writing board is provided with a round rod; the front end of the round rod is fixed to the bottom of the writing board in an axial horizontal manner; the rear end of the round rod is provided with a cylindrical guide block with one end vertically fixed thereto; The armrest is provided with a receiving cavity with an opening facing forward, a buffer block fixed to the receiving cavity, and a rotating body horizontally rotatably arranged in the receiving cavity; The rotating body is provided with a round hole suitable for the rear end of the round rod to be inserted, and a guide hole for the guide block to rotate through; the axial direction of the round hole is perpendicular to the axial direction of the rotating body; the guide hole is provided at the top of the rotating body and communicates with the round hole; When the writing board is in use, the rear end of the round rod is located outside the round hole and abuts against the handrail, and the guide block is in an axially horizontal state and abuts against the rotating body; When the writing board is swung 90° upward to switch to a non-use state, the rear end of the round rod is located in the round hole, and the guide block is in an axially vertical state; When the writing board is located in the accommodating cavity, the top surface of the buffer block abuts against the edge surface of the writing board; The top surface of the armrest is provided with a card entrance communicating with the accommodating cavity, and the bottom surface of the armrest plate is provided with a card block that can be carded in the card entrance; The armrest is provided with a holder fixed to the accommodating cavity; the holder is provided with a cylindrical cavity, and the rotating body is coaxially arranged in the cavity; the bottom of the holder is provided with an opening which is communicated with the cavity and is convenient for the round rod to pass through; when the writing board is in use, the rear end of the round rod is clamped in the opening.

2. The auditorium chair according to claim 1, characterized in that: Viewed from the axial direction of the cavity, the holder is circular and the opening is semicircular.

3. The auditorium chair according to claim 1 or 2, characterized in that: The outer circumference of the rotating body is in contact with the inner circumference of the cavity; the width of the opening is suitable for the diameter of the round rod.

4. The auditorium chair according to claim 1, characterized in that: The guide block is a screw rod, and the round rod is correspondingly provided with a screw hole suitable for threaded connection with the guide block.

5. The auditorium chair according to claim 1 or 4, characterized in that: The guide block is made of metal material.

6. The auditorium chair according to claim 1, characterized in that: The buffer block is made of rubber.

7. The auditorium chair according to claim 1 or 6, characterized in that: The top surface of the buffer block is an arc-shaped surface.

8. The auditorium chair according to claim 1, characterized in that: The bottom of the writing board is provided with an installation groove suitable for the round rod to be placed therein, and the round rod is provided with a fixing plate which is integrally connected therewith and is located below the installation groove, and the fixing plate is fixedly connected to the bottom surface of the writing board.

9. The auditorium chair according to claim 1, characterized in that: The clamping block is composed of an inverted L-shaped connecting portion and an inverted V-shaped clamping portion. The connecting portion is fixed to the bottom surface of the armrest plate, and one end of the clamping portion is connected to the bottom end of the connecting portion. When the clamping portion is inserted into the clamping entrance and abuts against the inner wall surface of the accommodating cavity located above, the bottom surface of the armrest plate fits with the top surface of the armrest.

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