Referee chair for tennis court

Abstract

The invention relates to the technical field of referee chairs, in particular to a referee chair for a tennis court, which comprises a bracket, a transverse plate, wheels, an auxiliary assembly and a seat, a plurality of transverse plates are fixedly installed at the front end of the support, wheels are rotationally installed at the rear end of the support, an auxiliary assembly is fixedly installed at the top of the support, and a seat is fixedly installed at the top of the auxiliary assembly. The auxiliary assembly drives the seat to rotate by stepping on the auxiliary assembly and applying pressure downwards; the multifunctional referee chair solves the problems that when an existing referee chair turns over or bends over for a long time, a referee feels tired, painful in back and uncomfortable, and the concentration of the referee is affected; under the condition that the referee turns back or bends over on the referee chair for a long time, the physical fatigue of the referee is relieved, back pain is avoided, the comfort of the referee is greatly improved, and the influence on the concentration of the referee is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of referee chairs, in particular to a referee chair for a tennis court. Background Art

[0002] The tennis umpire chair is an indispensable core refereeing tool in tennis matches. During intense matches, the high-angle view provided by the umpire chair allows the referee to track the ball's rotation trajectory in real time, determine whether the serve hits the line, and capture key moments such as whether the player has made a foot fault.

[0003] However, existing referee chairs are usually very high. During tennis matches, referees need to frequently turn around and lean forward to observe the sidelines and record scores. Since the referee chairs are generally fixed, turning around or leaning forward for a long time will cause physical fatigue, back pain and discomfort to the referee, affecting the referee's concentration. Summary of the Invention

[0004] The technical objectives to be achieved by the present invention are: to solve the problem that the existing referee chair will cause physical fatigue, back pain and discomfort to the referee when the referee turns around or leans forward for a long time, thereby affecting the referee's concentration; to achieve the goal of reducing the referee's physical fatigue and avoiding back pain when the referee turns around or leans forward for a long time on the referee chair, thereby greatly improving the referee's comfort and avoiding affecting the referee's concentration.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A referee chair for a tennis court comprises: a bracket, a cross board, wheels, an auxiliary assembly and a seat; a plurality of cross boards are fixedly mounted on the front end of the bracket, wheels are rotatably mounted on the rear end of the bracket, an auxiliary assembly is fixedly mounted on the top of the bracket, and a seat is fixedly mounted on the top of the auxiliary assembly; by stepping on the auxiliary assembly and applying downward pressure, the auxiliary assembly drives the seat to rotate.

[0006] Preferably, the auxiliary component includes a base plate, a rectangular box, a support column, a support plate, a rotating shaft, a turntable, a connecting column, a support seat and a moving block; a rectangular box is fixedly installed on the top of the base plate, a support column is fixedly installed inside the rectangular box, a support plate is fixedly installed on the top of the support column, a rotating shaft is rotatably installed on the top of the support plate, and the rotating shaft is coaxial with the support column, a turntable is fixedly installed on the top of the rotating shaft, a connecting column is fixedly installed on the top of the turntable, and the top of the connecting column is fixedly connected to the bottom of the seat, four support seats are respectively provided on the top of the support plate across an arbitrary diameter line, two of the support seats are located on one side of the rotating shaft, and the other two support seats are located on the other side of the rotating shaft, and a connecting shaft is respectively provided between two adjacent support seats, a first gear is respectively provided on the two connecting shafts, and a second gear is respectively provided on the ends of the two connecting shafts away from the rotating shaft, and the two moving blocks are movably mounted on the support plate.

[0007] Preferably, a plurality of fixed teeth are respectively provided on one side of the two moving blocks, and the plurality of fixed teeth are meshed with the second gear. The ends of the two moving blocks away from the second gear are respectively connected to the two adjacent rectangular blocks through cylindrical pins, and springs are provided at the bottoms of the two adjacent rectangular blocks. A connecting rod is fixedly installed between the two adjacent rectangular blocks, and the two connecting rods are respectively connected to the two adjacent supports through fixed pins, and the bottoms of the two adjacent supports are connected to the bottom plate. Pedals are respectively provided on the ends of the two connecting rods away from the rectangular blocks.

[0008] Preferably, a plurality of trapezoidal teeth are provided in a circular array around the axis at the bottom of the turntable, and the plurality of trapezoidal teeth are respectively engaged with the first gear.

[0009] Preferably, two mutually symmetrical limiting plates are respectively provided at the bottom of the turntable.

[0010] Preferably, two limit blocks are respectively provided on the bottom of the support plate passing through any diameter line, and rectangular through holes are respectively opened on the two limit blocks, and the two movable blocks respectively cooperate with the two rectangular through holes, and two openings are respectively opened on the support plate, and the two openings are respectively connected with the two rectangular through holes.

[0011] Preferably, two mutually symmetrical circular grooves are respectively provided on the bottom plate, and the two springs are respectively located inside the two circular grooves.

[0012] Preferably, two mutually symmetrical strip-shaped through holes are respectively opened on any one side surface of the rectangular box, and the two connecting rods pass through the two strip-shaped through holes respectively.

[0013] Preferably, the distance between the rectangular block and the support is 1 / 2 of the distance between the support and the pedal.

[0014] Preferably, the two second gears are not engaged with the fixed teeth on the two moving blocks at an initial position.

[0015] Beneficial effects of the present invention: 1. The present invention provides an auxiliary component between the bracket and the seat, and the auxiliary component and the seat cooperate with each other. By stepping on the auxiliary component and applying downward pressure, the auxiliary component drives the seat to rotate and assists the referee in turning around. During the long process of turning and leaning over, the referee's physical fatigue is reduced, back pain is avoided, the referee's comfort is greatly improved, and the referee's concentration is not affected.

[0016] 2. The present invention symmetrically arranges two moving blocks, a first gear and a second gear in the auxiliary component, and drives the corresponding moving blocks to move through two different left and right pedals, and causes the first gear and the second gear to rotate, thereby realizing the rotation of the turntable, further assisting in turning, greatly reducing the referee's physical fatigue, and improving the referee's comfort.

[0017] 3. The present invention provides a connecting rod in the auxiliary component. Through the mutual cooperation between the connecting rod and the support, a lever principle is formed, so that only a small downward force is needed to drive the seat to rotate, thereby reducing the referee's physical fatigue. At the same time, by providing a spring on the bottom plate, the seat can be further driven to reset, greatly improving the flexibility of the seat. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 Schematic diagram of the three-dimensional structure of the auxiliary components in the embodiment of the present disclosure.

[0020] Figure 3 Schematic diagram of the three-dimensional structure inside the auxiliary component in the embodiment of the present disclosure.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the auxiliary component without a rectangular box in the embodiment of the present disclosure.

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the auxiliary component without the rectangular box, bottom plate and connecting rod in the embodiment of the present disclosure.

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the support plate, the rotating shaft and the support base in the embodiment of the present disclosure.

[0024] Figure 7 Schematic diagram of the three-dimensional structure of the support plate and the limit block in the embodiment of the present disclosure.

[0025] Figure 8 Schematic diagram of the three-dimensional structure of the turntable and the connecting column in the embodiment of the present disclosure.

[0026] Figure markings: 1. bracket; 2. cross plate; 3. wheel; 4. auxiliary component; 41. bottom plate; 411. circular groove; 42. rectangular box; 421. strip through hole; 43. support column; 44. support plate; 441. limit block; 442. rectangular through hole; 443. opening; 45. rotating shaft; 46. turntable; 461. limit plate; 462. trapezoidal tooth; 47. connecting column; 48. support seat; 481. connecting shaft; 482. first gear; 483. second gear; 49. moving block; 491. fixed tooth; 492. cylindrical pin; 493. rectangular block; 494. spring; 495. connecting rod; 496. fixed pin; 497. support; 498. pedal; 5. seat; 6. lubricating oil tank. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] like Figures 1 to 8 As shown, a referee chair for a tennis court includes: a bracket 1, a horizontal board 2, wheels 3, an auxiliary component 4 and a seat 5; a plurality of horizontal boards 2 are fixedly mounted on the front end of the bracket 1, the wheels 3 are rotatably mounted on the rear end of the bracket 1, the auxiliary component 4 is fixedly mounted on the top of the bracket 1, and the seat 5 is fixedly mounted on the top of the auxiliary component 4; by stepping on the auxiliary component 4 and applying downward pressure, the auxiliary component 4 drives the seat 5 to rotate.

[0029] Frame 1, the load-bearing core of the referee chair, is welded from high-strength aluminum alloy and features an inverted trapezoidal frame structure, with a wider base than the top to ensure overall support stability. Multiple horizontal plates 2 are fixed to the front of frame 1 at 30cm intervals from bottom to top. These plates, made of non-slip textured steel, serve as footrests for referees getting on and off the chair and also enhance the structural strength of the front of frame 1, preventing deformation from prolonged load-bearing.

[0030] In order to improve the mobility of the referee chair, wheels 3 are rotatably installed on both sides of the rear end of the bracket 1. When the position of the referee chair needs to be adjusted, the bracket 1 can be pushed by the wheels 3, and the wheels 3 can be flexibly turned.

[0031] An auxiliary component 4 is fixedly installed on the top of the bracket 1 by bolts, and the seat 5 is fixedly installed on the top of the auxiliary component 4. It adopts an ergonomic design: armrests are installed on both sides of the backrest.

[0032] When the referee needs to observe the game in different areas, he only needs to step on the pedals 498 on both sides of the auxiliary component 4, and the mechanical structure inside the auxiliary component 4 will be linked according to the preset logic: the lever movement of the connecting rod 495 drives the gear set to engage and transmit, and finally drives the seat 5 to achieve left and right directional rotation, assisting the referee to turn around.

[0033] like Figures 1 to 4 As shown, the auxiliary component 4 includes a bottom plate 41, a rectangular box 42, a support column 43, a support disk 44, a rotating shaft 45, a turntable 46, a connecting column 47, a support seat 48 and a moving block 49; the rectangular box 42 is fixedly installed on the top of the bottom plate 41, the support column 43 is fixedly installed inside the rectangular box 42, the support disk 44 is fixedly installed on the top of the support column 43, the rotating shaft 45 is rotatably installed on the top of the support disk 44, and the rotating shaft 45 is coaxial with the support column 43, the turntable 46 is fixedly installed on the top of the rotating shaft 45, and the connecting column 47 is fixedly installed on the top of the turntable 46 , and the top of the connecting column 47 is fixedly connected to the bottom of the seat 5, four support seats 48 are respectively provided on the top of the support plate 44 through any diameter line, two support seats 48 are located on one side of the rotating shaft 45, and the other two support seats 48 are located on the other side of the rotating shaft 45, and a connecting shaft 481 is respectively provided between the two adjacent support seats 48, and a first gear 482 is respectively provided on the two connecting shafts 481, and a second gear 483 is respectively provided on the end of the two connecting shafts 481 away from the rotating shaft 45, and two moving blocks 49 are respectively movably mounted on the support plate 44.

[0034] Base plate 41 serves as the foundational support component of auxiliary assembly 4. Its edges are fixed to the top of bracket 1 via four sets of high-strength bolts, ensuring overall structural stability during seat 5 rotation and load-bearing. A sealed rectangular box 42 is welded to the center of base plate 41's upper surface. A support column 43 is vertically fixed inside box 42, and a support plate 44 is welded to its top. A bearing hole coaxial with support column 43 is provided in the center for mounting a rotating shaft 45.

[0035] The top of the turntable 46 is fixedly connected to the connecting column 47 via four sets of countersunk bolts, and the connecting column 47 is bolted to the seat 5, thus achieving a rigid transmission between the turntable 46 and the seat 5. It is worth noting that the connection points between the connecting column 47 and the turntable 46 are evenly distributed along the circumference, ensuring uniform force transmission when the seat 5 bears weight and preventing deformation caused by excessive local stress.

[0036] A connecting shaft 481 is horizontally arranged between the support seats 48 on the left and right sides. The side of each connecting shaft 481 close to the rotating shaft 45 is key-connected to the first gear 482, and the end away from the rotating shaft 45 is connected to the second gear 483. The two sets of gears are rotated synchronously through the connecting shaft 481, forming a core gear set for transmitting rotational power.

[0037] When the pedal 498 is stepped on, the moving block 49 can move upward along the limit block 441, so that the fixed tooth 491 is engaged with the second gear 483, thereby controlling the transmission of power, causing the seat 5 to rotate and assisting the referee to turn around.

[0038] like Figures 4 to 6 As shown, a plurality of fixed teeth 491 are respectively provided on one side of the two moving blocks 49, and the plurality of fixed teeth 491 are meshed with the second gear 483, and the two moving blocks 49 are respectively connected to the two adjacent rectangular blocks 493 through a cylindrical pin 492 on one end away from the second gear 483, and a spring 494 is provided at the bottom of the two adjacent rectangular blocks 493, and a connecting rod 495 is fixedly installed between the two adjacent rectangular blocks 493, and the two connecting rods 495 are respectively connected to the two adjacent supports 497 through a fixing pin 496, and the bottoms of the two adjacent supports 497 are connected to the base plate 41, and a pedal 498 is respectively provided on the end of the two connecting rods 495 away from the rectangular block 493.

[0039] At the end of the movable block 49, away from the second gear 483, a cylindrical pin 492 articulates with an adjacent rectangular block 493, ensuring flexible rotation between the two and transmitting axial thrust. The bottom of the rectangular block 493 is connected to one end of a spring 494. As the rectangular block 493 moves upward, the spring 494 stretches and stores elastic potential energy, providing power for subsequent resetting.

[0040] A connecting rod 495 is rigidly fixed between two adjacent rectangular blocks 493 by bolts. The middle portion of the connecting rod 495 is rotatably connected to the adjacent support 497 via a fixing pin 496, allowing the connecting rod 495 to flexibly rotate around the fixing pin 496. This forms a lever principle, allowing the referee to drive the seat 5 to rotate with a relatively small force.

[0041] When the referee steps on the right pedal 498, the connecting rod 495 rotates with the fixed pin 496 as the fulcrum, driving the right movable block 49 to move upward through the rectangular block 493, so that the fixed tooth 491 engages with the right second gear 483; when the left pedal 498 is stepped on, the left connecting rod 495 rotates, driving the left movable block 49 to move upward and engage with the left second gear 483, thereby realizing the left and right rotation control of the seat 5 respectively.

[0042] like Figure 8 As shown, a plurality of trapezoidal teeth 462 are provided in a circular array around the axis at the bottom of the turntable 46 , and the plurality of trapezoidal teeth 462 are respectively engaged with the first gear 482 .

[0043] When the first gear 482 rotates driven by the connecting shaft 481 , it will fit tightly with the side surface of the trapezoidal tooth 462 , thereby driving the entire turntable 46 to rotate and ensuring the stable transmission of the entire power.

[0044] like Figure 5 As shown, two symmetrical limiting plates 461 are respectively provided at the bottom of the turntable 46 .

[0045] Two symmetrical limit plates 461 are arranged symmetrically at 180°. The limit plates 461 are fixedly connected to the bottom of the turntable 46 by bolts. The rotation angle of the turntable 46 is limited by the limit plates 461, and the rotation angle of the turntable 46 is less than 90°.

[0046] The angle of rotation of the seat 5 can be determined by the distance that the pedal 498 moves downward. The referee presses the pedal 498 downward according to the actual situation to assist the referee in rotating the seat 5. When it is rotated to a certain angle, the pedal 498 will no longer be pressed, and the seat 5 will remain in the current position and will not continue to rotate.

[0047] As the turntable 46 rotates, driven by the meshing of the first gear 482 and the trapezoidal teeth 462, the stopper plate 461, which rotates synchronously with the turntable 46, gradually approaches the support base 48 on the support plate 44. When the seat 5 is rotated to the right to the preset maximum angle, the horizontal section of the right stopper plate 461 rigidly contacts the sidewall of the right support base 48. Similarly, when the seat 5 is rotated to the left to the maximum angle, the left stopper plate 461 contacts the left support base 48. This further enhances the safety and reliability of the referee chair's operation.

[0048] like Figure 4 and Figure 7 As shown, two limit blocks 441 are respectively provided on the bottom of the support plate 44 through any diameter line, and a rectangular through hole 442 is respectively opened on the two limit blocks 441, and the two movable blocks 49 respectively cooperate with the two rectangular through holes 442, and two openings 443 are respectively opened on the support plate 44, and the two openings 443 are respectively connected with the two rectangular through holes 442.

[0049] The two limit blocks 441 are used to ensure that the moving block 49 is limited and guided during the movement. When the moving block 49 moves up and down, the two side walls of the rectangular through hole 442 will form a lateral constraint on the moving block 49 to prevent the moving block 49 from shifting left and right or shaking during the movement, ensuring that the fixed teeth 491 on the moving block 49 can always maintain a precise meshing position with the second gear 483.

[0050] The opening 443 on the support plate 44 is used to ensure that the fixed teeth 491 on the moving block 49 will not contact the support plate 44 during the movement of the moving block 49, ensuring that the moving block 49 can move up and down smoothly and ensuring that the moving block 49 will not get stuck due to channel deviation when passing through the support plate 44.

[0051] like Figure 4 As shown, two mutually symmetrical circular grooves 411 are respectively provided on the bottom plate 41 , and the two springs 494 are respectively located inside the two circular grooves 411 .

[0052] The circular groove 411 provides an installation and positioning space for the spring 494. The two springs 494 are vertically installed in the two circular grooves 411 respectively, and the bottom of the spring 494 is fixedly connected to the bottom of the circular groove 411 by welding, ensuring the stability of the installation of the spring 494.

[0053] When rectangular block 493 moves upward, spring 494 is stretched, but its lower end is fixed in circular groove 411, preventing it from moving, thereby stably storing elastic potential energy. When pedal 498 is released, spring 494, as it returns to its original shape, exerts a downward pulling force on rectangular block 493 through the fixed point at the bottom of circular groove 411, driving rectangular block 493 and movable block 49 back to their original position. The lateral restraint of circular groove 411 on spring 494 also prevents lateral displacement or shaking of spring 494 during its extension and retraction, ensuring that spring 494 is always subjected to axial force.

[0054] like Figure 2 and Figure 3 As shown, two mutually symmetrical strip-shaped through holes 421 are respectively opened on any side surface of the rectangular box 42 , and the two connecting rods 495 pass through the two strip-shaped through holes 421 respectively.

[0055] The two connecting rods 495 pass through the corresponding bar-shaped through-holes 421 respectively, and a gap of 0.5 cm is retained between the connecting rods 495 and the through-holes, which ensures that the connecting rods 495 can swing flexibly without shaking due to excessive gaps. When the pedal 498 is stepped on to drive the connecting rods 495 to rotate around the fixed pin 496, the part of the connecting rods 495 passing through the bar-shaped through-hole 421 will swing in an arc along the length of the through-hole. The side walls of the bar-shaped through-hole 421 will limit the connecting rods 495 to prevent them from lateral displacement during movement, ensuring that the connecting rods 495 can always perform stable lever movement with the fixed pin 496 as the fulcrum. At the same time, the height range of the bar-shaped through-hole 421 strictly limits the maximum swing amplitude of the connecting rods 495, indirectly controlling the maximum displacement of the rectangular block 493 and the moving block 49.

[0056] like Figure 4 As shown, the distance between the rectangular block 493 and the support 497 is 1 / 2 of the distance between the support 497 and the pedal 498.

[0057] When the referee steps on pedal 498, the length of the lever arm at pedal 498 is twice the length of the lever arm at rectangular block 493. Based on the principle of lever balance, when the same force is applied at rectangular block 493, the force required at pedal 498 is halved, significantly reducing operational effort and making it less tiring for the referee during extended use.

[0058] like Figures 4 to 6As shown, the two second gears 483 are not engaged with the fixed teeth 491 on the two moving blocks 49 at the initial position.

[0059] Initially, the two second gears 483 and the fixed teeth 491 on the two moving blocks 49 are not engaged. Initially, the moving blocks 49 are at their lowest position due to the natural tension of the bottom spring 494. A clearance of 1-2 mm is maintained between the fixed teeth 491 on the moving blocks 49 and the corresponding second gears 483. The tooth tops of the fixed teeth 491 are completely offset vertically from the tooth grooves of the second gears 483, resulting in no tooth contact and no force transmission.

[0060] When the pedal 498 on one side is stepped on, the movable block 49 on that side moves upward to make the fixed tooth 491 engage with the second gear 483, while the other side remains in the initial non-engaged state, avoiding simultaneous contact and engagement of both sides, thereby causing interference and making the turntable 46 unable to move.

[0061] It should be noted that since the moving blocks 49 on the left and right sides are not in contact with the second gear 483 in the initial position, when the pedal 498 is depressed, the moving block 49 moves upward and contacts the second gear 483, so that the fixed tooth 491 and the second gear 483 are engaged. During long-term operation, wear will occur between the two. Therefore, two lubricating oil tanks 6 need to be installed on the support plate 44, and these two lubricating oil tanks 6 respectively wrap the moving blocks 49 and the second gear 483 on the left and right sides, and the moving block 49 and the rectangular through hole 442 are sealed and slidably connected to prevent the lubricating oil inside the lubricating oil tank 6 from leaking, thereby reducing the wear between the moving block 49 and the second gear 483 and improving its service life. At the same time, it can reduce the downward pressure of the foot, and in the initial position, the moving block 49 moves upward, and the fixed tooth 491 can accurately engage with the second gear 483.

[0062] The overall working process of the present invention is that when the referee needs to turn his body to the right, he can step on the right pedal 498 and apply downward pressure to the pedal 498, so that the pedal 498 drives the connecting rod 495 to move downward together. The connecting rod 495 will rotate with the fixed pin 496 as the origin, so that the other end of the connecting rod 495 moves upward and drives the rectangular block 493 to move upward. The spring 494 at the bottom of the rectangular block 493 will be stretched. During the upward movement of the rectangular block 493, the moving block 49 will be driven to move upward. The fixed tooth 491 on the moving block 49 will mesh with the second gear 483. As the moving block 49 moves, the second gear 483 will be driven to rotate, and the second gear 483 will transmit power to the first gear 482 through the connecting shaft 481, and drive the first gear 482 to rotate. Since the first gear 482 is engaged with the trapezoidal teeth 462 on the turntable 46, the turntable 46 will be driven to rotate to the right, and the turntable 46 will drive the connecting column 47 and the seat 5 to rotate to the right together. Due to the limit plate 461 at the bottom of the turntable 46, after rotating to the moving angle, the limit plate 461 will contact the side wall of the support seat 48 and limit the continued rotation of the turntable 46, thereby preventing the seat 5 from rotating too much.

[0063] At the same time, the first gear 482 and the second gear 483 on the other side will also rotate in the opposite direction. Since the second gear 483 on the other side and the fixed tooth 491 on the moving block 49 are not engaged with each other in the initial position, the rotation of the seat 5 will not be interfered with.

[0064] When the body rotates back, the pedal 498 is released, and the spring 494 on the bottom plate 41 will use its own elastic potential energy to pull the rectangular block 493 and the moving block 49 downward to cooperate with the movement of the body, so that the seat 5 and the pedal 498 return to their original positions, and the fixed tooth 491 on the moving block 49 will disengage from the second gear 483. Similarly, when the body needs to turn left, the left pedal 498 can be stepped on to rotate the seat 5 to the left.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A referee chair for a tennis court, characterized in that: include: A bracket (1), a transverse plate (2), wheels (3), an auxiliary component (4) and a seat (5); a plurality of transverse plates (2) are fixedly mounted on the front end of the bracket (1), wheels (3) are rotatably mounted on the rear end of the bracket (1), an auxiliary component (4) is fixedly mounted on the top of the bracket (1), and a seat (5) is fixedly mounted on the top of the auxiliary component (4); by stepping on the auxiliary component (4) and applying downward pressure, the auxiliary component (4) drives the seat (5) to rotate.

2. A tennis court referee chair as claimed in claim 1, characterized in that: The auxiliary component (4) includes a bottom plate (41), a rectangular box (42), a support column (43), a support disk (44), a rotating shaft (45), a turntable (46), a connecting column (47), a support seat (48) and a moving block (49); the rectangular box (42) is fixedly mounted on the top of the bottom plate (41), the support column (43) is fixedly mounted inside the rectangular box (42), the support disk (44) is fixedly mounted on the top of the support column (43), the rotating shaft (45) is rotatably mounted on the top of the support disk (44), and the rotating shaft (45) is coaxial with the supporting column (43), the turntable (46) is fixedly mounted on the top of the rotating shaft (45), and the connecting column (47) is fixedly mounted on the top of the turntable (46). A connecting column (47) is provided, and the top of the connecting column (47) is fixedly connected to the bottom of the seat (5); four supporting seats (48) are respectively provided on the top of the support plate (44) over an arbitrary diameter line; two of the supporting seats (48) are located on one side of the rotating shaft (45); the other two supporting seats (48) are located on the other side of the rotating shaft (45); and a connecting shaft (481) is respectively provided between two adjacent supporting seats (48); a first gear (482) is respectively provided on the two connecting shafts (481); a second gear (483) is respectively provided at one end of the two connecting shafts (481) away from the rotating shaft (45); and the two moving blocks (49) are respectively movably mounted on the support plate (44).

3. A tennis court referee chair as claimed in claim 2, characterized in that: A plurality of fixed teeth (491) are respectively provided on one side of the two moving blocks (49), and the plurality of fixed teeth (491) are meshed with the second gear (483). The ends of the two moving blocks (49) away from the second gear (483) are respectively connected to the two adjacent rectangular blocks (493) through cylindrical pins (492). The bottoms of the two adjacent rectangular blocks (493) are provided with springs (494). A connecting rod (495) is fixedly installed between the two adjacent rectangular blocks (493). The two connecting rods (495) are respectively connected to the two adjacent supports (497) through fixed pins (496). The bottoms of the two adjacent supports (497) are connected to the bottom plate (41). Pedals (498) are respectively provided on the ends of the two connecting rods (495) away from the rectangular blocks (493).

4. A tennis court referee chair as claimed in claim 3, characterized in that: A plurality of trapezoidal teeth (462) are provided in a circular array at the bottom of the rotating disk (46) with the axis as the center, and the plurality of trapezoidal teeth (462) are respectively engaged with the first gear (482).

5. The tennis court referee chair according to claim 2, characterized in that: Two mutually symmetrical limiting plates (461) are respectively provided at the bottom of the rotating disk (46).

6. The tennis court referee chair according to claim 2, characterized in that: Two limit blocks (441) are respectively provided on the bottom of the support plate (44) on any diameter line, and the two limit blocks (441) are respectively provided with rectangular through holes (442), and the two moving blocks (49) respectively cooperate with the two rectangular through holes (442), and two openings (443) are respectively provided on the support plate (44), and the two openings (443) are respectively communicated with the two rectangular through holes (442).

7. The tennis court referee chair according to claim 3, characterized in that: Two mutually symmetrical circular grooves (411) are respectively provided on the bottom plate (41), and the two springs (494) are respectively located inside the two circular grooves (411).

8. The tennis court referee chair according to claim 3, characterized in that: Two mutually symmetrical strip-shaped through holes (421) are respectively provided on any one side surface of the rectangular box (42), and the two connecting rods (495) respectively pass through the two strip-shaped through holes (421).

9. The tennis court referee chair according to claim 3, characterized in that: The distance between the rectangular block (493) and the support (497) is 1 / 2 of the distance between the support (497) and the pedal (498).

10. The tennis court referee chair according to claim 3, characterized in that: The two second gears (483) and the fixed teeth (491) on the two moving blocks (49) are not engaged at the initial position.

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