Tray

Abstract

The utility model discloses a tray, which comprises a base, a swing seat hinged with the base at the middle position, and a locking device, the swing seat can obliquely swing left and right relative to the base, a moving plate of the locking device is loaded on any one of the swing seat and the base, and a locking hole is arranged on the other one of the swing seat and the base. And when the insertion part of the movable plate enters or leaves the locking hole, the tray can be switched to be in a locking state or a swinging state. The swinging seat can swing to relieve the fatigue of the user due to long-time sitting and reduce the compression injury and disease of the spine due to long-time sitting; when a user does not need to swing the swing seat, the locking device switch can be triggered to lock the swing function of the swing seat; the stay wire is matched with the pressure spring to control the moving plate to move, so that the state of the tray is changed, the locking implementation mode is simple in structure and easy to operate, and the flexible stay wire enables a switch for controlling the length of the stay wire at the terminal of the stay wire to be arranged at any position where a user can operate conveniently.

Description

Technical Field

[0001] The utility model relates to a seat, in particular to a tray. Background Art

[0002] Nowadays, users have higher and higher requirements for the comfort of long-term sitting in office and study chairs. Manufacturers are improving user comfort in terms of backrests, lumbar supports, seats, and additional seat functions.

[0003] In order to alleviate the discomfort caused by sitting for a long time to the waist and back, the existing seat backs are designed in an ergonomic style. The backrest is convenient for users to lean on and the angle can change as the user leans on it. There are even seats that can adapt to the user's weight to rise and fall when the user leans on or leaves the backrest, reducing the "back rubbing feeling", improving the user's leaning comfort and relieving fatigue from sitting for a long time. In addition to the corresponding functions of the seat backs and seats to relieve discomfort from sitting for a long time, there are now some seats with rocking seats, which allow users to move after sitting for a long time, thereby alleviating the pressure on the lumbar spine caused by maintaining a sitting posture for a long time and reducing the incidence of lumbar diseases.

[0004] The authorization announcement number CN215874044U discloses a seat chassis and a rehabilitation seat, wherein the seat chassis includes a lower support plate with four corners bent upward and an upper support plate with four corners bent downward, and the four corners of the lower support plate and the upper support plate are respectively connected to the upper and lower ends of the floating swing rod; wherein the floating swing rod has a certain elasticity, so the seat chassis can swing with the gravity change when the user moves while sitting, so that the user can move the upper body from time to time while sitting, preventing the user from maintaining an incorrect sitting posture for a long time and causing excessive burden on the spine. Although this utility model can alleviate the burden of long-term sitting on the spine, it cannot meet the user's demand that the seat can remain horizontal when the user does not need the seat to swing. Summary of the invention

[0005] The purpose of the utility model is to overcome the deficiencies existing in the above-mentioned prior art and to provide a pallet, wherein the swing seat of the pallet can be tilted and swung left and right relative to the base, by loading a movable plate on the swing seat or the base, and opening a locking hole on the other, when the insertion portion of the movable plate enters the locking hole, the swing seat can be locked relative to the base and cannot swing, and the pallet can be switched to a locked state.

[0006] The technical solution of the utility model is achieved in this way:

[0007] A tray comprises a base, a swing seat hinged to the base at a middle position, the swing seat can tilt and swing left and right relative to the base, and also comprises a locking device, the locking device comprises a movable movable plate, the movable plate is loaded on one of the swing seat or the base, the movable plate has an insertion portion, and a locking hole is provided on the other of the swing seat or the base; the tray has a locking state and a swing state, in the swing state, the movable plate moves in one direction to drive the insertion portion to disengage the locking hole, so that the swing seat can swing without restriction; when the swing state is converted to the locking state, the insertion portion moves in the opposite direction to drive the insertion portion to insert into the locking hole, and the swing seat is locked relative to the base and cannot tilt and swing left and right.

[0008] A movable plate is movably arranged on the swing seat or the base, and a locking hole is opened on the other one. The movement of the movable plate drives the insertion part to enter or leave the locking hole, so that the swing seat can be locked or swung relative to the base. This method of realizing the swing locking of the swing seat has a simple structure and is easy to operate. Users can choose the swing seat to swing left and right according to their own needs to relieve fatigue from sitting for a long time and reduce compression and damage to the spine caused by sitting for a long time, or choose to keep the swing seat level and not sway in situations that require high mental concentration.

[0009] Preferably, the front wall of the swing seat is located in front of the base, a support plate for supporting the moving plate is fixed on the front wall of the swing seat, the moving plate is placed flat on the support plate, and the moving plate is configured to slide horizontally along the support plate and remain relatively fixed with the support plate in the longitudinal direction, a guide hole corresponding to the insertion part is opened on the front wall of the swing seat, and a locking hole is correspondingly arranged on the side of the base, the insertion part is inserted into the guide hole and faces the locking hole. The moving plate is placed on the front wall of the swing seat, and a guide hole is arranged on the front wall, and the insertion part of the moving plate can be inserted into the guide hole at a relatively close distance, so that the entire locking device has a compact structure and is convenient for realizing the locking function.

[0010] Preferably, the insertion part is a plug plate extending backward integrally from the rear edge of the movable plate, the position and number of the guide holes correspond to the plug plate, the width of the movable plate is greater than the base, the left and right ends of the front of the base have symmetrically arranged and outwardly extending side wings, the side wings have ear plates extending upward, and locking holes are opened at the corresponding positions of the ear plates. The width of the movable plate is set to arrange the plug plate at a greater distance within the effective length of the base, combined with the locking holes set at the left and right ends of the front of the base, which can effectively increase the locking force arm for locking the swing seat to swing, so that the locking performance of the swing seat is good.

[0011] Preferably, the inserting part is integrally formed on the left and right sides of the rear edge of the moving plate. The inserting part and the moving plate are integrally formed for easy processing and manufacturing. The position setting of the inserting part enables the locking device to have a longer locking force arm, and the locking effect of the swing seat is good.

[0012] Preferably, the guide hole and the locking hole are both rectangular holes, which can effectively cooperate with the insertion of the plate-type insertion part.

[0013] Preferably, a limiting hole is provided on the movable plate, and a fixing hole is provided on the supporting plate. The fixing hole is a threaded through hole, and a fixing screw passes through the limiting hole and is connected to the fixing hole, so that the movable plate is longitudinally mounted on the upper surface of the supporting plate, so that the movable plate and the supporting plate are relatively fixed in the longitudinal direction; the movable plate can move forward and backward along the limiting hole relative to the supporting plate. The movable plate is longitudinally fixed on the supporting plate and can move forward and backward along the limiting hole relative to the supporting plate, so that the insertion portion of the movable plate can effectively enter or leave the locking hole.

[0014] Preferably, the locking device further comprises a toggle assembly, which can drive the movable plate to move back and forth; when the toggle assembly drives the insertion portion of the movable plate to be inserted into the guide hole on the swing seat and the locking hole on the base at the same time, the swing seat is locked relative to the base and cannot tilt or swing left or right; when the toggle assembly drives the insertion portion of the movable plate to leave the locking hole on the base and only be inserted into the guide hole on the swing seat, the swing seat can swing unrestrictedly and can tilt or swing left or right relative to the base. The toggle assembly can toggle the movable plate to move, so that the insertion portion of the movable plate can effectively enter or leave the locking hole, so that the tray can switch between the locked state and the swing state.

[0015] Preferably, a downwardly extending fixing frame is fixed on the support plate, and the fixing frame is configured to support the toggle assembly. The fixing frame for fixing the toggle assembly is directly fixed on the support plate, and the structure is compact and space-saving.

[0016] Preferably, the toggle assembly includes a wire control, which includes an outer tube and a pull wire that telescopes in the outer tube. The outer tube is mounted on a fixed frame, and the part of the pull wire that is exposed from the outer tube is connected to a ball head. A compression spring is also provided between the ball head and the fixed frame. The compression spring is arranged along the direction in which the pull wire extends. A torsion spring is provided on the right side of the wire control. The ferrule in the middle of the torsion spring is mounted on a fastening screw connected to the lower surface of the support plate so that the torsion spring as a whole rotates around the fastening screw. The torsion spring has a torque arm a and a torque arm b that are respectively arranged on both sides of the fastening screw. The end of the torque arm a is circular and is mounted on the pull wire and abuts against the ball head. The torque arm b is bent and passes through the toggle hole reserved on the moving plate. The rotation of the torsion spring is controlled by the wire control and the compression spring. This method has a simple structure and is easy to operate, and it is easy to realize the movement of the moving plate.

[0017] Preferably, when the pull wire moves in the shortening direction, the ball head drives the torque arm a to rotate while the compression spring is compressed to generate a resetting elastic force, and the torque arm b moves the moving plate away from the swing seat, at which time the insertion part leaves the locking hole, and the tray enters a swinging state; when the pull wire is released, that is, moves in the lengthening direction, the compression spring releases the elastic force to help the ball head and the torsion spring to reset, and the torque arm b moves the moving plate close to the swing seat, at which time the insertion part contracts the locking hole, and the tray enters a locked state. The pull wire and the compression spring cooperate to control the rotation of the torsion spring, so that the torsion spring moves the moving plate. This implementation method has a simple structure; because the pull wire is flexible and can change direction, the switch for controlling the length of the pull wire at the terminal can be set at any position that is convenient for the user to operate.

[0018] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0019] The pallet of the present invention includes a base and a swing seat hinged to the base at a middle position. The swing seat can tilt and swing left and right relative to the base. In addition, it also includes a locking device. The movable plate of the locking device is loaded on either the swing seat or the base, and a locking hole is provided on the other. When the insertion portion of the movable plate enters or leaves the locking hole, the pallet can switch to a locked state or a swinging state.

[0020] This patent adopts a movable plate as the plug-in body. The movable plate is integrated and has higher strength. It only moves in the horizontal direction and has a strong shear force bearing capacity. After the insertion part is inserted into the locking hole, when the swing seat has a tendency to swing, the movable plate can share most of the shear force borne by the insertion part, so that the swing seat can be more stably maintained in the locked state.

[0021] Furthermore, the insertion part is a lug square plate integrally formed on both sides of the movable plate, and the corresponding locking hole is a square hole with the same shape as the lug. The insertion part is only partially formed on the movable plate, and its movement is more flexible.

[0022] The swing seat can swing to relieve users' fatigue caused by long-term sitting and reduce the compression, damage and symptoms of long-term sitting on the spine; when the user does not need the swing seat to swing, the locking device switch can be triggered to lock the swing function of the swing seat; a pull wire is used in conjunction with a compression spring to control the movement of the movable plate, thereby changing the state of the tray. This locking implementation method has a simple structure and is easy to operate, and the flexible pull wire allows the switch at the pull wire terminal that controls the length of the pull wire to be set at any position that is convenient for the user to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall schematic diagram of the tray of the utility model;

[0024] Figure 2 It is an exploded schematic diagram of the pallet of the utility model;

[0025] Figure 3 This is a front view of the tray swing seat of the utility model when it is in a horizontal state;

[0026] Figure 4 This is a front view of the tray swing seat of the utility model when it is in a leftward swinging state;

[0027] Figure 5 This is a front view of the tray swing seat of the utility model when it is in a rightward swinging state;

[0028] Figure 6 This is a three-dimensional view of the tray of the utility model when the support base of the seat chassis is in a raised state;

[0029] Figure 7 It is a three-dimensional schematic diagram of the tray of the utility model;

[0030] Figure 8 It is an exploded schematic diagram and a partial enlarged diagram of the pallet of the utility model;

[0031] Fig. 9 It is a three-dimensional schematic diagram of the tray of the utility model in a locked state;

[0032] Fig.10 It is a side view and a partial cross-sectional view of the tray of the utility model in a locked state;

[0033] Fig.11 It is a three-dimensional schematic diagram of the tray of the utility model in an unlocked state;

[0034] Fig.12 It is a side view and a partial cross-sectional view of the tray of the utility model in an unlocked state.

[0035] The reference numerals of the figures are as follows: swing seat 1; support plate 101; guide hole 102; fixing hole 1011; fixing screw 1012; fixing frame 1013; base 2; locking hole 201; side wing 202; ear plate 2021; long hole 203; locking device 3; toggle assembly 301; wire control 3011; outer tube 30111; pull wire 30112; ball head 30113; compression spring 3012; torsion spring 3013; torque arm a 30131; torque arm b 30132; fixing screw 3014; moving plate 302; insertion part 3021; ​​limiting hole 3022; toggle hole 3023; bracket 4; support plate 401; vertical plate 402; crank 5; mounting plate 501; third pin 6; first pin 7; sliding guide mechanism 8; slide groove 801; second pin 9. DETAILED DESCRIPTION

[0036] The present invention is further described below with a specific embodiment. In order to reduce the pressure and damage to the lumbar spine caused by long-term sitting, the existing chair has developed a seat that can be raised and lowered as the user leans forward or backward when sitting. In addition, the seat can also swing left and right. However, in situations where the user does not need the seat to swing left and right, the seat swing function needs to be locked to maintain a horizontal state.

[0037] Based on the above reasons, Figure 1-12 As shown, the pallet of this embodiment includes a base 2 and a swing seat 1 hinged to the base 2 at the middle position. When in use, the base 2 is inserted above the gas rod and fixed, and the swing seat 1 can tilt and swing left and right relative to the base 2. Figure 3 The swing seat 1 is shown in a horizontal state. Figure 4 The swing seat 1 is shown in a state of swinging to the left. Figure 5 The swing seat 1 is shown in a state of swinging to the right; in addition, the tray of this embodiment also includes a bracket 4 and a crank 5 for supporting the seat, the crank 5 is symmetrically arranged on the left and right sides of the bracket 4, and the tail ends of the two cranks 5 are fixed with mounting plates 501 for connecting the seat back.

[0038] Specific instructions, such as Figure 2 and Figure 6 As shown, the crank 5 is in an inclined state, the upper end of the crank 5 is hinged to the bracket 4 through the third pin 6, and the lower end of the crank 5 is hinged to the swing seat 1 through the first pin 7; a sliding guide mechanism 8 is provided between the bracket 4 and the swing seat 1 to guide the bracket 4 to rise and fall, the bracket 4 includes a support plate 401 and vertical plates 402 hanging down on the left and right sides of the support plate 401, the sliding guide mechanism 8 includes a limiting groove 801 and a second pin 9, the limiting groove 801 is opened in the vertical plate 402 or the swing seat 1 The second pin shaft 9 is connected to one of the vertical plates 402 or the other of the rocking seats 1, and the second pin shaft 9 is inserted in the limiting groove 801. The mounting plate 501 is fixed to the seat back. When the user leans on the backrest or leaves the backrest, the mounting plate 501 drives the crank 5 to rotate synchronously, the bracket 4 rises and falls, and the second pin shaft 9 and the limiting groove 801 slide relative to each other to increase the safety of the user leaning on, that is, as the user leans on or leaves the backrest, the seat can rise and fall according to the user's weight. Figure 1 and Figure 6 As shown, the bracket is in a descending and ascending state respectively.

[0039] Further explanation, such as Figure 8As shown, in order to limit the swing range of the swing seat 1 and to prevent the swing seat 1 from hitting the base 2 to cause damage and abnormal noise, long holes 203 are preset on the left and right sides of the base 2, and the first pin shaft 7 passes through the long hole 203. When the swing seat 1 swings left and right, the first pin shaft 7 moves up and down in the long hole 203; in addition, the left and right swing and lifting of the seat are both provided with elastic mechanisms, which are used to provide buffering force and reset elastic force for the swing and lifting of the seat, thereby improving the user's comfort. The invention of this embodiment is to solve the technical problem that the seat can be locked when it swings left and right, so the elastic mechanism will not be elaborated in detail.

[0040] To further explain, Figure 7 and Figure 8 As shown, the tray also includes a locking device 3 for locking the swing function of the swing seat, and the locking device 3 includes a movable movable plate 302, the width of the movable plate 302 is greater than the base 2, and the left and right sides of the rear edge of the movable plate 302 are partially extended backward with an insertion portion 3021. In order to facilitate the production and installation of the movable plate 302, the insertion portion 3021 is an insert plate integrally formed with the movable plate 302, and the insert plate protrudes backward from the rear edge of the movable plate 302, and the thickness of the insert plate is consistent with that of the movable plate 302; the installation of the movable plate 302 The method is as follows: a limiting hole 3022 is opened on the movable plate 302, and a fixing hole 1011 is opened on the support plate 101. The fixing hole 1011 is a threaded through hole. The fixing screw 1012 passes through the limiting hole 3022 and is connected to the fixing hole 1011 to install the movable plate 302 on the upper surface of the support plate 101, so that the movable plate 302 and the support plate 101 remain relatively fixed in the longitudinal direction; but in the transverse direction, the movable plate 302 can move forward and backward along the limiting hole 3022 relative to the support plate 101.

[0041] To further explain, Figure 8 , Fig.10 and Fig.12 As shown, the front wall of the swing seat 1 is located in front of the base 2, and a support plate 101 for supporting the moving plate 302 is fixedly provided on the front wall of the swing seat 1, and the moving plate 302 is placed flat on the support plate 101, and the moving plate 302 is configured to slide horizontally along the support plate 101 and remain relatively fixed with the support plate 101 in the longitudinal direction, and a guide hole 102 corresponding to the insertion portion 3021 is opened on the front wall of the swing seat 1; the left and right ends of the front part of the base 2 are provided with symmetrically arranged and outwardly extending side wings 202, and the side wings 202 extend upward with ear plates 2021, and locking holes 201 are opened at corresponding positions of the ear plates 2021; the insertion portion 3021 is inserted into the guide hole 102 and is directly opposite to the locking hole 201. In order to facilitate the insertion of the insertion portion 3021, the guide hole 102 and the locking hole 201 are both rectangular holes; the positions and quantities of the guide holes 102 and the locking holes 201 correspond to the plug plate.

[0042] To further explain, Figure 7 and Figure 8 As shown, the locking device 3 also includes a toggle assembly 301 capable of controlling the reciprocating movement of the movable plate 302, a downwardly extending fixing frame 1013 is fixedly provided on the support plate 101, and the fixing frame 1013 is used to support the toggle assembly 301; the toggle assembly 301 includes a wire control 3011, and the wire control 3011 includes an outer tube 30111 and a pull wire 30112 that telescopes and moves in the outer tube 30111, and the outer tube 30111 is installed on the fixing frame 1013, and the part of the pull wire 30112 exposed from the outer tube 30111 is connected to a ball head 30113, and a compression spring 3012 is also provided between the ball head 30113 and the fixing frame 1013 The compression spring 3012 is arranged along the extending direction of the pull wire 30112, and a torsion spring 3013 is arranged on the right side of the wire control 3011. The ring in the middle of the torsion spring 3013 is mounted on a fastening screw 3014 connected to the lower surface of the support plate 101, so that the torsion spring 3013 as a whole rotates around the fastening screw 3014. The torsion spring 3013 has a torque arm a30131 and a torque arm b30132 respectively arranged on both sides of the fastening screw 3014. The end of the torque arm a30131 is circular and mounted on the pull wire 30112 and abuts against the ball head 30113, and the torque arm b30132 is bent and passes through the dial hole 3023 reserved on the movable plate 302.

[0043] To further explain, Fig.11 and Fig.12 As shown, when the pull wire 30112 moves in the shortening direction, the ball head 30113 drives the torque arm a30131 to rotate while the compression spring 3012 is compressed to generate a restoring elastic force, and the torque arm b30132 synchronously moves the moving plate 302 away from the swing seat 1. At this time, the insertion portion 3021 leaves the locking hole 201, the swing of the swing seat 1 is not restricted, and the tray enters a swinging state; Figure 7 , Fig. 9 and Fig.10 As shown, when the pull wire 30112 is released, that is, moves in the lengthening direction, the compression spring 3012 releases the elastic force to help the ball head 30113 and the torsion spring 3013 to reset, and the torque arm b30132 synchronously moves the movable plate 302 close to the rocking seat 1. At this time, the insertion part 3021 tightens the locking hole 201, the rocking of the rocking seat 1 is restricted, and the tray enters a locked state; the wire control 3011 has a terminal switch, which is used to control the lengthening or shortening of the pull wire and maintain the corresponding lengthening or shortening state. Since the outer tube 30111 of the wire control 3011 and the pull wire 30112 are both flexible, the terminal switch of the wire control 3011 can be placed in any position that is convenient for the user to operate according to the overall appearance design of the seat.

[0044] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A tray, comprising a base (2), and a swing seat (1) hinged to the base (2) at a middle position, wherein the swing seat (1) can tilt and swing left and right relative to the base (2), characterized in that: The tray further comprises a locking device (3), wherein the locking device (3) comprises a movable moving plate (302), the moving plate (302) being loaded on one of the swing seat (1) or the base (2), the moving plate (302) having an insertion portion (3021), and a locking hole (201) being provided on the other of the swing seat (1) or the base (2); the tray has a locking state and a swing state, wherein in the swing state, the moving plate (302) moves in one direction to drive the insertion portion (3021) to disengage from the locking hole (201), so that the swing seat (1) can swing without restriction; when the swing state is converted to the locking state, the insertion portion (3021) moves in the opposite direction to drive the insertion portion (3021) to insert into the locking hole (201), and the swing seat (1) is locked relative to the base (2) so that it cannot tilt or swing left or right.

2. The pallet according to claim 1, characterized in that: The front wall of the swing seat (1) is located in front of the base (2); a support plate (101) for supporting the movable plate (302) is fixedly provided on the front wall of the swing seat (1); the movable plate (302) is placed flat on the support plate (101); and the movable plate (302) is configured to slide horizontally along the support plate (101) and remain relatively fixed with the support plate (101) in the longitudinal direction; a guide hole (102) corresponding to the insertion portion (3021) is opened on the front wall of the swing seat (1); the locking hole (201) is correspondingly arranged on the side of the base (2); the insertion portion (3021) is inserted into the guide hole (102) and is directly opposite to the locking hole (201).

3. The pallet according to claim 2, characterized in that: The inserting portion (3021) is an inserting plate integrally extending backwards from a portion of the rear edge of the movable plate (302); the position and number of the guide holes (102) correspond to those of the inserting plate; the width of the movable plate (302) is greater than that of the base (2); the front left and right ends of the base (2) are provided with symmetrically arranged and outwardly extending side wings (202); the side wings (202) are upwardly extended with ear plates (2021); and the locking holes (201) are provided at positions corresponding to the ear plates (2021).

4. The pallet according to claim 3, characterized in that: The insertion portion (3021) is integrally formed on the left and right sides of the rear edge of the movable plate (302).

5. The tray according to claim 2, characterized in that: The guide hole (102) and the locking hole (201) are both rectangular holes.

6. The pallet according to claim 2, characterized in that: The movable plate (302) is provided with a limiting hole (3022), and the support plate (101) is provided with a fixing hole (1011), the fixing hole (1011) being a threaded through hole, and the fixing screw (1012) passes through the limiting hole (3022) and is connected to the fixing hole (1011), so that the movable plate (302) is longitudinally mounted on the upper surface of the support plate (101), so that the movable plate (302) and the support plate (101) are relatively fixed in the longitudinal direction; the movable plate (302) can move forward and backward relative to the support plate (101) along the limiting hole (3022).

7. The pallet according to claim 2, characterized in that: The locking device (3) further comprises a toggle assembly (301), the toggle assembly (301) being capable of driving the movable plate (302) to move back and forth; when the toggle assembly (301) drives the insertion portion (3021) of the movable plate (302) to be inserted into the guide hole (102) on the swing seat (1) and the locking hole (201) on the base (2) at the same time, the swing seat (1) is locked relative to the base (2) and cannot tilt or swing left or right; when the toggle assembly (301) drives the insertion portion (3021) of the movable plate (302) to leave the locking hole (201) on the base (2) and only be inserted into the guide hole (102) on the swing seat (1), the swing seat (1) is not restricted in swinging and can tilt or swing left or right relative to the base (2).

8. The pallet according to claim 7, characterized in that: A downwardly extending fixing frame (1013) is fixedly provided on the support plate (101), and the fixing frame (1013) is configured to support the toggle assembly (301).

9. The pallet according to claim 8, characterized in that: The toggle assembly (301) comprises a wire control (3011), the wire control (3011) comprising an outer tube (30111) and a pull wire (30112) that telescopes in the outer tube (30111), the outer tube (30111) being mounted on a fixing frame (1013), the portion of the pull wire (30112) that is exposed from the outer tube (30111) being connected to a ball head (30113), a compression spring (3012) being arranged between the ball head (30113) and the fixing frame (1013), the compression spring (3012) being arranged along the direction in which the pull wire (30112) extends, and a torsion spring (3012) being arranged on the right side of the wire control (3011) The torsion spring (3013) is provided with a ferrule in the middle of the torsion spring (3013) which is sleeved on a fastening screw (3014) connected to the lower surface of the support plate (101) so that the torsion spring (3013) as a whole rotates around the fastening screw (3014). The torsion spring (3013) comprises a torque arm a (30131) and a torque arm b (30132) which are respectively arranged on both sides of the fastening screw (3014). The end of the torque arm a (30131) is circularly sleeved on the pull wire (30112) and abuts against the ball head (30113). The torque arm b (30132) is bent and passes through a dial hole (3023) reserved on the movable plate (302).

10. The pallet according to claim 9, characterized in that: When the pull wire (30112) moves in the shortening direction, the ball head (30113) drives the torque arm a (30131) to rotate, while the compression spring (3012) is compressed to generate a restoring elastic force, and the torque arm b (30132) moves the movable plate (302) away from the swing seat (1), at which time the insertion portion (3021) leaves the locking hole (201), and the tray enters a swinging state; when the pull wire (30112) is released, i.e., moves in the lengthening direction, the compression spring (3012) releases the elastic force to help the ball head (30113) and the torsion spring (3013) to reset, and the torque arm b (30132) moves the movable plate (302) close to the swing seat (1), at which time the insertion portion (3021) contracts the locking hole (201), and the tray enters a locked state.

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