Thickness-reduced tray

Abstract

The thickness-reduced tray comprises a main supporting seat used for being connected with a supporting base, a seat connecting piece used for being connected with a chair seat and a back connecting piece used for being connected with a chair back, the seat connecting piece is arranged on the main supporting seat, and the back connecting piece is rotationally arranged on the main supporting seat through a single rotating shaft; the back connecting piece is rotationally connected with a buffering assembly arranged in the front-back direction through a supporting shaft on the back connecting piece, an abutting plate on the main supporting base allows the transmission piece to penetrate through, and the elastic piece is arranged on the transmission piece in a sleeving mode and abuts against the transmission piece and the abutting plate so as to provide elastic buffering when the back connecting piece falls down. Rotation of the back connecting piece is achieved through the single rotating shaft, cost is reduced, production and assembly are simplified, production efficiency is improved, the buffering assembly is directly connected with the back connecting piece, and the problem that after-sale faults are difficult to confirm is solved. Meanwhile, the thickness of the tray is reduced, two purposes are achieved, the material cost and packaging and transportation are saved, the tray cost is further reduced, and higher market competitiveness is achieved.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a tray with reduced thickness. Background Technology

[0002] In the seating manufacturing industry, the tray is a core component connecting the seat, legs, and backrest. Its design quality directly affects the overall performance and cost-effectiveness of the seat. Traditional seat tray designs have a series of problems that affect product competitiveness.

[0003] Existing pallets come at different price points, and low-cost pallets have several problems. Taking one low-cost pallet as an example, this pallet includes a main support, a seat connector, and a back connector. The back connector connects to a chair back. Since the chair back requires elastic cushioning when rotating backward, a cushioning component is included in the pallet. This cushioning component is vertically arranged, with a seat extending downward from the main support for mounting a spring. An adjusting component is threaded onto the external part of this seat, and the spring is housed within this seat. Because the back connector needs to be linked with the spring, it is rotatably mounted on the main support via a pivot and is also linked to the seat connector via another pivot. It also requires a rotating shaft to rotate with the main support base. Finally, the spring is sleeved on a rod, which is set on the seat connector to realize the linkage between the back connector and the spring. When the back connector rotates backward and downward, it drives the seat connector to rotate, and at the same time drives the rod to rotate to compress the spring. Finally, the spring provides elastic cushioning. This transmission chain is long and requires a large number of rotating shafts, which not only wastes costs and makes production and assembly more complicated, but also makes after-sales service difficult. When problems occur, it is difficult to quickly determine the location or rotating shaft of the problem. In addition, the vertically set cushioning components increase the thickness of the pallet, which wastes some material costs, packaging and transportation costs. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a thinner pallet comprising a main support for connecting a support base, a seat connector for connecting a chair seat, and a back connector for connecting a chair back. The seat connector is mounted on the main support, and the back connector is rotatably mounted on the main support via a single pivot. The back connector is rotatably connected to a buffer assembly arranged in a front-to-back direction via a support shaft. An abutment plate on the main support allows a transmission component to pass through, and an elastic element is fitted onto the transmission component and abuts against the transmission component and the abutment plate to provide elastic cushioning when the back connector falls. The rotation of the back connector via a single pivot reduces costs, simplifies production and assembly, and improves production efficiency. Directly connecting the buffer assembly to the back connector solves the problem of difficult fault identification in after-sales service. Simultaneously, reducing the pallet thickness achieves two benefits: saving material costs, packaging and transportation costs, further reducing pallet costs, and achieving stronger market competitiveness.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A thinned tray includes a main support, a seat connector, and a back connector. The main support serves as a support base for connecting a seat to a chair. The seat connector is mounted on the main support and serves as a seat for connecting the chair. The back connector is rotatably mounted at the rear of the main support and serves as a back connector for connecting the chair. A left-right oriented pivot is located at the rear end of the main support, and the back connector is mounted on the pivot. A support shaft is mounted on the back connector, and a buffer assembly is rotatably mounted on the support shaft. The buffer assembly includes an elastic element and a transmission element, both arranged in a front-rear direction. The transmission element is mounted on the support shaft and moves back and forth with the rotation of the back connector. The elastic element is sleeved on the transmission element. An abutment plate is located on the main support, and the transmission element passes through the abutment plate. The two ends of the elastic element abut against the abutment plate and the transmission element, respectively, and the elastic element expands and contracts with the movement of the transmission element. The buffer assembly provides elastic cushioning when the back connector rotates backward and downward.

[0007] In this solution, the rotation of the back connector is achieved through a single pivot, reducing costs, simplifying production and assembly, improving production efficiency, and avoiding difficulties in fault diagnosis during after-sales service. Furthermore, by directly connecting the cushioning component to the back connector to reduce the transmission chain, the elastic cushioning becomes more direct, resulting in a more noticeable and comfortable experience for the user. This also further solves the problem of difficult fault diagnosis during after-sales service. Since the traditional vertical arrangement cannot be used to directly connect the cushioning component to the back connector, this solution arranges the cushioning component longitudinally, front and back. This achieves direct connection between the cushioning component and the back connector while simultaneously reducing the thickness of the pallet, achieving two goals at once: saving material costs, packaging and transportation costs, further reducing pallet costs, and achieving stronger market competitiveness.

[0008] Preferably, the main support includes two side plates spaced apart from each other, the two side plates are vertical and parallel to each other, and the pivot is set on the side plates. The rotation setting of the back connector is very simple and does not require the linkage of the seat connector.

[0009] Preferably, the main support also includes a base plate, which is located between the two side plates and integrally formed with them. The base plate has a first clearance groove, configured to allow the base plate to avoid the back connector when it rotates backward. The back connector has a second clearance groove, configured to avoid the base plate when it rotates backward. The base plate is horizontally arranged, with the first clearance groove opening backward and the second clearance groove opening downward. After the back connector is rotatably mounted on the main support, the side plates need to be long enough to rotatably connect with the back connector. The base plate may also have a certain length to ensure the strength of the side plates, simplify the structure, and reduce costs such as mold making. Therefore, a longer base plate would cause interference when the back connector rotates backward and downward. Thus, the clearance grooves are used to ensure structural strength while preventing motion interference.

[0010] Preferably, the back connector includes two rotating plates spaced apart from each other and a connecting plate located between the two rotating plates. The two rotating plates are vertical and parallel to each other, and are connected to a rotating shaft. Each of the two rotating plates has a second clearance groove located at its lower end and opening downwards. The connecting plate is connected to the rear of the two rotating plates and disconnects from them at the second clearance groove. After the connecting plate disconnects from the rotating plates, it effectively avoids interference with the bottom plate, and the backward and downward rotation of the back connector will not interfere with the bottom plate. There are two first clearance grooves, the number and position of which correspond to the two rotating plates.

[0011] Preferably, the main support base is roughly U-shaped. The shape of the main support base is relatively conventional, requiring no additional costs for design and mold making.

[0012] Preferably, the front end of the main support is provided with a cover, which is configured to close the open front end of the main support. The cover is attached to the main support by a spring clip; the cover has an opening to expose the control end face of the transmission component, so that the user can easily adjust the initial elastic force of the spring component.

[0013] Preferably, a connecting seat is fitted onto the support shaft, and the transmission component is threadedly connected to the connecting seat. The length of the transmission component protruding from the connecting seat can be adjusted, thereby adjusting the initial elastic force of the elastic component.

[0014] Preferably, the front end face of the transmission component is a control end face, and an adjustment groove is provided on the control end face. The adjustment groove is an internal hexagonal hole, which can be adjusted by the user using an internal hexagonal wrench.

[0015] Preferably, the front end of the transmission component has a radially protruding blocking portion, and the front end of the elastic component abuts against the blocking portion. The blocking portion enables the transmission component to drive the elastic component to extend and retract during its back-and-forth movement.

[0016] Preferably, the abutment plate has a clearance hole, and the transmission component passes through the clearance hole. The size of the clearance hole is larger than the diameter of the transmission component. When the back connector rotates, the transmission component does not move linearly back and forth, but will be displaced in the height direction. When the support shaft is above the rotational connection point between the back connector and the base, the support shaft will be displaced in the height direction as the back connector rotates, and the rear end of the transmission component will shift upward accordingly. The diameter of the clearance hole needs to be large enough to completely avoid the transmission component.

[0017] Preferably, the seat connector is slidably mounted on the main support base. The seat connector has a sliding groove arranged in the front-to-back direction, and the main support base has a guide member disposed in the sliding groove. The front-to-back sliding of the seat connector on the main support base can be used to adjust the seat depth.

[0018] Preferably, the main support base is open upwards, and a mounting plate is fixedly installed on the main support base. The guide component is fixedly connected to the mounting plate by bolts. The main support base is roughly U-shaped, with an open top to reduce material costs. However, the front-to-back sliding of the seat connector requires support, so a mounting plate is installed on the support base. The mounting plate is located on the upper part of the main support base, and the guide component is installed on the mounting plate to provide support for the sliding of the seat connector.

[0019] Preferably, a rotating seat is provided on the outer surface of the main support base, with the axis of the rotating seat arranged in the front-to-back direction. An operating lever is rotatably mounted in the rotating seat. An entry hole is provided on the side of the rotating seat. The operating lever includes an actuating part, which enters the main support base through the entry hole. The end of the actuating part is a locking part. The locking part is vertically upward. A moving groove parallel to the sliding groove is provided on the seat connector. Several position grooves are provided on the side of the moving groove, which are spaced apart in the front-to-back direction and all of them pass through the moving groove. The locking part is selectively located in the moving groove or the position groove. When the locking part is located in the moving groove, the seat connector can move back and forth relative to the main support base. When the locking part is located in the position groove, the seat connector is stationary relative to the main support base. The operating lever is configured such that rotation of the operating lever drives the locking part to switch between the moving groove and the position groove. When the locking part is in the moving groove, sliding the seat connector back and forth unlocks it, allowing the seat connector to slide back and forth. After sliding, the locking part re-enters the position groove, locking the seat connector in the slid-out position, thus completing the adjustment.

[0020] Preferably, the operating lever also includes an insertion part and an operating part. The insertion part is arranged in the front-to-back direction and rotatably mounted in the rotating seat, while the operating part is arranged in the left-to-right direction and protrudes outward from the main support seat. A return spring is sleeved on the insertion part, with its two ends respectively mounted on the main support seat and the operating lever. The return spring is configured to provide a spring force to rotate the operating lever, the direction of which is to cause the locking part to enter the gear slot. Moving the operating part allows the operating lever to be operated, switching the locking part between the moving slot and the gear slot. When the return spring always provides a downward spring force to the operating lever, moving the operating part upward causes the locking seat connector to slide back and forth, and releasing it locks the lever.

[0021] Preferably, a tension spring is provided between the seat connector and the main support seat, and the tension spring is configured to provide a spring force to the seat connector for backward movement. The front end of the seat connector protrudes forward from the main support seat, a first spring seat is provided below the front part of the seat connector, and a second spring seat is provided inside the main support seat. The two ends of the tension spring are respectively provided on the two spring seats and provide a spring force to the seat connector for backward movement.

[0022] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0023] In this solution, the rotation of the back connector is achieved through a single pivot, reducing costs, simplifying production and assembly, improving production efficiency, and avoiding difficulties in fault diagnosis during after-sales service. Furthermore, by directly connecting the cushioning component to the back connector to reduce the transmission chain, the elastic cushioning becomes more direct, resulting in a more noticeable and comfortable experience for the user. This also further solves the problem of difficult fault diagnosis during after-sales service. Since the traditional vertical arrangement cannot be used to directly connect the cushioning component to the back connector, this solution arranges the cushioning component longitudinally, front and back. This achieves direct connection between the cushioning component and the back connector while simultaneously reducing the thickness of the pallet, achieving two goals at once: saving material costs, packaging and transportation costs, further reducing pallet costs, and achieving stronger market competitiveness. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the tray in the embodiments of this utility model. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the tray in the embodiments of this utility model. Figure 2 ;

[0026] Figure 3 This is a three-dimensional structural diagram of the present invention, in an embodiment, showing that the mounting plate is mounted on the main support and the guide is mounted on the mounting plate;

[0027] Figure 4 This is a three-dimensional structural diagram of the seat connector in an embodiment of the present invention;

[0028] Figure 5 This is a three-dimensional structural diagram of the first and second clearance grooves in an embodiment of the present invention;

[0029] Figure 6 This is a three-dimensional structural diagram of the buffer assembly in the embodiment of the present invention, which is arranged in the main support base. Figure 1 ;

[0030] Figure 7 This is a three-dimensional structural diagram of the buffer assembly in the main support base in an embodiment of the present invention. Figure 2 .

[0031] The reference numerals in the attached drawings are as follows: main support seat 1; side plate 11; bottom plate 12; first clearance groove 121; rotating seat 13; entry hole 14; seat connector 2; sliding groove 21; moving groove 22; gear groove 23; first spring seat 24; back connector 3; rotating plate 31; second clearance groove 313; connecting plate 32; rotating shaft 4; elastic element 5; transmission element 6; blocking part 61; support shaft 7; connecting seat 8; abutment plate 9; clearance hole 91; cover 10; mounting plate 15; guide element 16; gasket 17; operating lever 18; locking part 180; actuating part 181; insertion part 182; operating part 183; return spring 19; tension spring 20; second spring seat 25. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0034] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] The specific implementation of this utility model is as follows:

[0036] like Figure 1 , 6As shown, this utility model provides a tray with reduced thickness, including a main support base 1, a seat connector 2, and a back connector 3. The main support base 1 is configured as a main support and a support base for connecting a seat. The seat connector 2 is disposed on the main support base 1 and configured as a seat for connecting the seat. The back connector 3 is rotatably disposed at the rear of the main support base 1 and configured as a backrest for connecting the seat. The rear end of the main support base 1 is provided with a left-right oriented rotating shaft 4, and the back connector 3 is disposed on the rotating shaft 4. The back connector 3 is provided with a support shaft 7, and the support shaft 7... The rotating part is equipped with a buffer assembly, which includes an elastic element 5 and a transmission element 6. Both the elastic element 5 and the transmission element 6 are arranged in the front-to-back direction. The transmission element 6 is mounted on the support shaft 7 and moves back and forth with the rotation of the back connector 3. The elastic element 5 is sleeved on the transmission element 6. The main support seat 1 is provided with an abutment plate 9. The transmission element 6 passes through the abutment plate 9 front and back. The two ends of the elastic element 5 abut against the abutment plate and the transmission element 6 respectively. The elastic element 5 extends and retracts with the movement of the transmission element 6. The buffer assembly is configured to provide elastic buffering when the back connector 3 rotates backward and downward.

[0037] In this solution, the rotation of the back connector 3 is achieved through a single rotating shaft 4, reducing costs, simplifying production and assembly, improving production efficiency, and avoiding difficulties in fault diagnosis during after-sales service. Furthermore, by directly connecting the cushioning component to the back connector 3 to reduce the transmission chain, the elastic cushioning becomes more direct, resulting in a more noticeable and comfortable experience for the user, while further resolving the difficulty in fault diagnosis during after-sales service. Since the traditional vertical arrangement cannot be used to directly connect the cushioning component to the back connector 3, this solution arranges the cushioning component longitudinally, front and back. This achieves direct connection between the cushioning component and the back connector 3 while simultaneously reducing the thickness of the pallet, achieving two goals at once: saving material costs, packaging and transportation costs, further reducing pallet costs, and achieving stronger market competitiveness.

[0038] Specifically, such as Figure 1-4 As shown, the seat connector 2 is a single plate. The main support seat 1 includes two side plates 11 spaced apart from each other. The two side plates 11 are vertical and parallel to each other. The rotating shaft 4 is set on the side plates 11. The way the back connector 3 is rotated is very simple and does not require the linkage of the seat connector 2. The main support seat 1 also includes a base plate 12, which is located between the two side plates 11 and is integrally formed with the two side plates 11. The main support seat 1 is roughly U-shaped and opens upward. The shape of the main support seat 1 is relatively conventional and does not require additional design and mold making costs. The back connector 3 includes two rotating plates 31 spaced apart from each other and a connecting plate 32 located between the two rotating plates 31. The two rotating plates 31 are vertical and parallel to each other and are connected to the rotating shaft 4.

[0039] like Figure 5As shown, a first clearance groove 121 is provided on the base plate 12, which is configured to allow the base plate 12 to avoid the back connector 3 when the back connector 3 rotates backward; a second clearance groove 313 is provided on the back connector 3, which is configured to avoid the base plate 12 when the back connector 3 rotates backward; the base plate 12 is arranged horizontally, with the first clearance groove 121 opening backward and the second clearance groove 313 opening downward; after the back connector 3 is rotatably mounted on the main support 1, the side plate 11 needs to be long enough to rotatably connect with the back connector 3. The base plate 12 may have a certain length to ensure the strength of the side plate 11, and can also simplify the structure and reduce costs such as mold opening; therefore, the longer length of the base plate 12 will cause interference when the back connector 3 rotates backward and downward, so the clearance groove is provided to ensure the structural strength while preventing motion interference.

[0040] Furthermore, the two rotating plates 31 are each provided with the second clearance groove 313. The second clearance groove 313 is located at the lower end of the rotating plate 31 and opens downward. The connecting plate 32 is connected to the rear of the two rotating plates 31 and is disconnected from the rotating plate 31 at the second clearance groove 313. After the connecting plate 32 is disconnected from the rotating plate 31, it can effectively avoid the bottom plate 12. The backward and downward rotation of the back connector 3 will not interfere with the bottom plate 12. There are two first clearance grooves 121, and their number and position correspond to the two rotating plates 31.

[0041] like Figure 6 , 7 As shown, the abutment plate 9 is vertically inserted and fixedly connected to the middle of the main support base 1. The front end of the transmission component 6 has a radially protruding blocking part 61. The front end of the elastic component 5 abuts against the blocking part 61. The blocking part 61 enables the transmission component 6 to drive the elastic component 5 to extend and retract when it moves back and forth. The abutment plate 9 has a clearance hole 91. The transmission component 6 passes through the clearance hole 91. The size of the clearance hole 91 is larger than the diameter of the transmission component 6. When the back connector 3 rotates, the transmission component 6 does not move back and forth in a straight line, but will be displaced in the height direction. Specifically, the support shaft 7 is located in front of and above the rotating shaft 4. The support shaft 7 will be displaced upward in the height direction as the back connector 3 rotates. The rear end of the transmission component 6 will be offset upward accordingly. The diameter of the clearance hole 91 needs to be large enough to completely avoid the transmission component 6.

[0042] The elastic element 5 is a spring, the transmission element 6 is a rod with a thread at the rear end, and the support shaft 7 is fitted with a connecting seat 8. The transmission element 6 is threadedly connected to the connecting seat 8. The length of the transmission element 6 protruding from the connecting seat 8 can be adjusted, thereby adjusting the initial elastic force of the elastic element 5. Furthermore, the front end face of the transmission element 6 is a control end face, and the control end face is provided with an adjustment groove. The adjustment groove is an internal hexagonal hole, which can be adjusted by the user using an internal hexagonal wrench.

[0043] The front end of the main support base 1 is provided with a cover 10, which is configured to close the front end of the main support base 1. The cover 10 is set on the main support base 1 by an elastic buckle. The cover 10 has an opening to expose the control end face of the transmission component 6, so that the user can adjust the initial elastic force of the elastic component 5.

[0044] In addition, such as Figure 1-4 As shown, the seat connector 2 is slidably mounted on the main support seat 1. The seat connector 2 is provided with a sliding groove 21, which is arranged in the front-back direction. The main support seat 1 is provided with a guide 16, which is disposed in the sliding groove 21. The seat connector 2 can be used to adjust the seat depth by sliding back and forth on the main support seat 1.

[0045] Specifically, a mounting plate 15 is fixedly mounted on the main support base 1, and the guide member 16 is fixedly connected to the mounting plate 15 by bolts. The main support base 1 is roughly U-shaped, with an open top to reduce material costs, but the back-and-forth sliding of the seat connector 2 requires support. Therefore, a mounting plate 15 is set on the support base, and the mounting plate 15 is located on the upper part of the main support base 1. The guide member 16 is set on the mounting plate 15 to support the sliding of the seat connector 2. A washer 17 is also provided between the bolt head and the seat connector 2. The diameter of the washer 17 is larger than the groove diameter of the slide groove 21. There are two mounting plates 15, which are arranged back and forth at intervals. Each mounting plate 15 is provided with two guide members 16 arranged left and right at intervals. Each guide member 16 is provided with a washer 17, and each guide member 16 has a corresponding slide groove 21 to maintain the stability of the sliding of the seat connector 2.

[0046] A rotating seat 13 is provided on the outer side of the main support base 1. The axis of the rotating seat 13 is arranged in the front-back direction. An operating lever 18 is rotatably mounted in the rotating seat 13. An entry hole 14 is opened on the side of the rotating seat 13. The operating lever 18 includes an action part 181, which enters the main support base 1 through the entry hole 14. The end of the action part 181 is a locking part 180. The locking part 180 is vertically upward. A moving groove 22 parallel to the sliding groove 21 is opened on the seat connector 2. Several stop grooves 23 are opened on the side of the moving groove 22. The several stop grooves 23 are arranged at intervals in the front-back direction, and all stop grooves 23 pass through the moving groove 22. The locking part 180 is selectively located in the moving groove 22 or the stop groove 23. When the locking part 180 is located in the moving groove 22, the seat connector 2... The locking part 180 is able to move back and forth relative to the main support 1. When the locking part 180 is in the gear position groove 23, the seat connector 2 is relatively stationary with respect to the main support 1. The operating lever 18 is configured such that the rotation of the operating lever 18 will drive the locking part 180 to switch between the moving groove 22 and the gear position groove 23. The operating lever 18 also includes an insertion part 182 and an operating part 183. The insertion part 182 is arranged in the front-back direction and rotatably disposed in the rotating seat 13. The operating part 183 is arranged in the left-right direction and protrudes outward from the main support 1. A return spring 19 is sleeved on the insertion part 182. The two ends of the return spring 19 are respectively disposed on the main support 1 and the operating lever 18. The return spring 19 is configured to provide a spring force for the rotation of the operating lever 18, and the direction of this rotation is to cause the locking part 180 to enter the gear position groove 23.

[0047] When the locking part 180 is in the moving groove 22, the seat connector 2 slides back and forth to unlock, and the seat connector 2 can slide back and forth. After sliding, the locking part 180 enters the gear groove 23, which locks the seat connector 2 in the slid position, thus completing the adjustment. Moving the operating part 183 up and down can operate the operating lever 18, so that the locking part 180 switches between the moving groove 22 and the gear groove 23. When the return spring 19 always applies a downward force to the operating lever 18, moving the operating part 183 up unlocks the back and forth sliding of the seat connector 2, and releasing it locks it.

[0048] A tension spring 20 is provided between the seat connector 2 and the main support seat 1. The tension spring 20 is configured to provide a spring force to the seat connector 2 to move backward. The front end of the seat connector 2 protrudes forward from the main support seat 1. A first spring seat 24 is provided below the front part of the seat connector 2. A second spring seat 25 is provided inside the main support seat 1. The second spring seat 25 is fixedly connected to the abutment plate 9 and the base plate 12. The two ends of the tension spring 20 are respectively set on the two spring seats and provide a spring force to the seat connector 2 to move backward.

Claims

1. A tray with reduced thickness, characterized in that: The device includes a main support base, a seat connector, and a back connector. The main support base serves as the main support and a base for connecting the seat. The seat connector is mounted on the main support base and serves as the seat for connecting the seat. The back connector is rotatably mounted at the rear of the main support base and serves as the back of the seat. The rear end of the main support base has a pivot arranged in a left-right direction, and the back connector is mounted on the pivot. The back connector has a support shaft, and a buffer assembly is rotatably mounted on the support shaft. The buffer assembly includes an elastic element and a transmission element, both of which are arranged in a front-back direction. The transmission element is mounted on the support shaft and moves back and forth with the rotation of the back connector. The elastic element is sleeved on the transmission element. The main support base has an abutment plate, through which the transmission element passes. The two ends of the elastic element abut against the abutment plate and the transmission element, respectively, and the elastic element expands and contracts with the movement of the transmission element. The buffer assembly provides elastic cushioning when the back connector rotates backward and downward.

2. The tray with reduced thickness according to claim 1, characterized in that: The main support base includes two side plates spaced apart from each other. The two side plates are vertical and parallel to each other, and the pivot is set on the side plates.

3. The tray with reduced thickness according to claim 2, characterized in that: The main support also includes a base plate, which is located between the two side plates and is integrally formed with the two side plates; a first clearance groove is provided on the base plate, which is configured to allow the base plate to avoid the back connector when the back connector rotates backward; a second clearance groove is provided on the back connector, which is configured to avoid the base plate when the back connector rotates backward.

4. The tray with reduced thickness according to claim 3, characterized in that: The back connector includes two rotating plates spaced apart from each other and a connecting plate located between the two rotating plates. The two rotating plates are vertical and parallel to each other and are connected to a rotating shaft. The two rotating plates are provided with the second clearance groove, which is located at the lower end of the rotating plate and opens downward. The connecting plate is connected to the rear of the two rotating plates and is disconnected from the rotating plates at the second clearance groove.

5. The tray with reduced thickness according to claim 1, characterized in that: The main support base is roughly U-shaped.

6. The tray with reduced thickness according to claim 1, characterized in that: A connecting seat is fitted onto the support shaft, and the transmission component is threadedly connected to the connecting seat.

7. The tray with reduced thickness according to claim 6, characterized in that: The front end face of the transmission component is the control end face, and an adjustment groove is provided on the control end face.

8. The tray with reduced thickness according to claim 1, characterized in that: The front end of the transmission component has a radially protruding blocking part, and the front end of the elastic component abuts against the blocking part.

9. The tray with reduced thickness according to claim 1, characterized in that: The abutment plate has clearance holes, and the transmission component passes through the clearance holes. The size of the clearance holes is larger than the diameter of the transmission component.

10. The tray with reduced thickness according to claim 1, characterized in that: The seat connector is slidably mounted on the main support seat. The seat connector is provided with a sliding groove, which is set along the front-to-back direction. The main support seat is provided with a guide, which is set in the sliding groove.

11. The tray with reduced thickness according to claim 10, characterized in that: The main support base is open upwards, and a mounting plate is fixedly installed on the main support base. The guide component is fixedly connected to the mounting plate by bolts.

12. The tray with reduced thickness according to claim 10, characterized in that: A rotating seat is provided on the outer surface of the main support base. The axis of the rotating seat is arranged in the front-to-back direction, and an operating lever is rotatably mounted in the rotating seat. An entry hole is opened on the side of the rotating seat. The operating lever includes an action part, which enters the main support base through the entry hole. The end of the action part is a locking part. The locking part is vertically upward. A moving groove parallel to the sliding groove is opened on the seat connector. Several position grooves are opened on the side of the moving groove. The position grooves are arranged at intervals in the front-to-back direction, and all position grooves are connected to the moving groove. The locking part is selectively located in the moving groove or the position groove. When the locking part is located in the moving groove, the seat connector can move back and forth relative to the main support base. When the locking part is located in the position groove, the seat connector is relatively stationary with respect to the main support base. The operating lever is configured such that rotation of the operating lever will drive the locking part to switch between the moving groove and the position groove.

13. The tray with reduced thickness according to claim 12, characterized in that: The operating lever also includes an insertion part and an operating part. The insertion part is arranged in the front-to-back direction and rotatably mounted in the rotating seat. The operating part is arranged in the left-to-right direction and protrudes outward from the main support seat. A return spring is sleeved on the insertion part. The two ends of the return spring are respectively mounted on the main support seat and the operating lever. The return spring is configured to provide a spring force for the rotation of the operating lever. The direction of this rotation is to cause the locking part to enter the gear slot.

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