A manual multi-level angle positioning and adjustment small plate for a car seat backrest

Abstract

The present invention discloses a manual multi-stage angle positioning and adjustment small board for a car seat backrest, comprising a support frame, a board surface, a left fixing frame and a right fixing frame, wherein the board surface is embedded in the support frame, the left fixing frame and the right fixing frame are respectively fixedly mounted on the car seat backrest, and the support frame is mounted on the left fixing frame and the right fixing frame, and the small board also has a rotation angle adjustment device, wherein the rotation angle adjustment device adjusts the rotation angle of the support frame by manual control, thereby achieving the function of multi-stage angle adjustment of the small board, and the support frame can be locked and positioned after the small board reaches the required rotation position. The small board can realize multi-stage adjustment of the angle of the small board according to the height, sight line and angle change of the front backrest of the rear passengers when using the front back small board, and can be locked after the adjustment is completed, so as to meet the use needs of different passengers and improve comfort.

Description

Technical Field

[0001] The invention provides a matching part of an automobile seat, in particular to a small backrest plate of the automobile seat with manual multi-stage angle positioning adjustment. Background Art

[0002] Ergonomics is particularly important in improving vehicle comfort. Whether it is the driver's vehicle operation, vision or the entertainment comfort of the rear passengers, ergonomics is indispensable. In general, the quality of the vehicle's comfort experience depends on the flexible application and consideration of ergonomics.

[0003] At present, most of the small boards installed on the backrests of vehicles for use by rear passengers on the market can only be placed in a horizontal position when used by the passengers. When using the small boards for reading books or newspapers and other entertainment, the passengers need to hold the books or newspapers in their hands and lean their upper bodies forward, which makes them easily tired after a long time, causing sore hands and back and extremely poor comfort. The inclination angle of the small board cannot be adjusted in multiple levels according to the line of sight of different passengers and the changes in the angle of the front seat back to meet the experience needs of different passengers.

[0004] The adjustment mechanism of the small board on the vehicle seat back for rear passengers is basically a connecting rod mechanism. The connecting rod mechanism takes up a large space during adjustment and is easily damaged by frequent vehicle bumps and use by passengers, causing jamming problems. In severe cases, it may cause the folding function to fail, the adjustment operation to be obstructed, and affect the normal use of the small board. Summary of the invention

[0005] The purpose of the present invention is to provide a manual multi-stage angle positioning adjustable car seat backrest small board, which can realize multi-stage adjustment of the small board angle according to the height and line of sight of the occupants and the angle change of the front backrest when the rear passengers use the front backrest small board, and can be locked after the adjustment is completed, so as to meet the usage needs of different passengers and improve comfort.

[0006] The above-mentioned purpose of the present invention is achieved through the following technical scheme: a manual multi-stage angle positioning and adjustable small panel of a car seat back, comprising a supporting frame plate, a panel surface, a left fixing frame and a right fixing frame, the panel surface is embedded in the supporting frame plate, the left fixing frame and the right fixing frame are respectively fixedly mounted on the car seat back, and the supporting frame plate is mounted on the left fixing frame and the right fixing frame, characterized in that: the small panel also has a rotation angle adjustment device, the rotation angle adjustment device adjusts the rotation angle of the supporting frame plate by manual control, thereby achieving the function of multi-stage angle adjustment of the small panel, and the supporting frame plate can be locked and positioned after the small panel reaches the required rotation position.

[0007] In the present invention, the support frame plate is provided with a support frame plate gear hole, the rotation angle adjustment device comprises a handle, a movable frame, a transmission gear, a positioning rotation shaft, a compression spring and a main fixed shaft, the handle is connected to the movable frame through the rotation shaft, and can drive the movable frame to move, the main fixed shaft comprises a left main fixed shaft and a right main fixed shaft, the compression spring comprises a left compression spring and a right compression spring, the positioning rotation shaft comprises a left positioning rotation shaft and a right positioning rotation shaft, the transmission gear comprises a left transmission gear and a right transmission gear, wherein,

[0008] The left fixing frame and the right fixing frame are provided with fixing frame through holes and fixing frame gear holes processed coaxially with the fixing frame through holes. The left main fixing shaft and the right main fixing shaft are respectively inserted into the fixing frame through holes and the fixing frame gear holes. The fixing frame gear holes have the same structure as the supporting frame plate gear holes and are coaxially arranged.

[0009] The left-side positioning rotating shaft is fitted onto the left-side main fixed shaft, and the right-side positioning rotating shaft is fitted onto the right-side main fixed shaft. The left-side positioning rotating shaft and the right-side positioning rotating shaft have the same structure, including a positioning rotating shaft gear end and a positioning rotating shaft cross-through hole end. The positioning rotating shaft gear ends are successively inserted into the supporting frame plate gear hole and the fixing frame gear hole, and are both meshed with the supporting frame plate gear hole and the fixing frame gear hole. The positioning rotating shaft cross-through hole end has a cross through hole, and vertical teeth are arranged in the vertical direction of the cross through hole.

[0010] The left transmission gear and the right transmission gear are arranged vertically, and the left transmission gear and the right transmission gear are installed in the guide hole arranged on the support frame plate after passing through the cross through hole vertically, and the left transmission gear and the right transmission gear are meshed with the vertical teeth at the end of the cross through hole of the positioning rotation shaft;

[0011] One end of the left compression spring and the right compression spring is sleeved on the end of the left positioning rotating shaft and the right positioning rotating shaft away from the gear end of the positioning rotating shaft, and the other end is connected to the limit block arranged on the supporting frame plate;

[0012] One end of the mobile frame connected to the torsion spring reset unit is the operating end, the middle part is the mobile frame slide rail, and the other end is an outer frame with a rack. The rack in the outer frame includes a row of mobile frame racks on the left and right sides, and the mobile frame racks extend out after passing through the cross through hole of the positioning rotating shaft. The rack section of the mobile frame rack located in the cross through hole of the positioning rotating shaft is meshed with the left transmission gear and the right transmission gear. The mobile frame rack is connected to the connecting plate at the extended end extending out of the cross through hole of the positioning rotating shaft.

[0013] The rotation angle adjustment device drives the transmission gear to rotate through the handle and the movable frame, and then drives the positioning rotating shaft to move, so that the positioning rotating shaft can be freed from the constraint of the gear hole of the fixed frame, thereby adjusting the support frame plate. At the same time, due to the meshing restriction of the gear hole of the support frame plate on the gear end of the positioning rotating shaft, multi-level angle adjustment of the support frame plate can be achieved.

[0014] In the present invention, the support frame plate is provided with two arched guide sleeves, the limit block is arranged between the two guide sleeves, the guide hole is a semicircular hole in the guide sleeve, and the left positioning rotation axis and the right positioning rotation axis pass through the two guide holes respectively.

[0015] In the present invention, the support frame plate is provided with a groove, the groove matches with the moving frame slide rail of the moving frame, and the moving frame slide rail can slide relative to the groove along the length direction of the groove.

[0016] In the present invention, the sliding rail of the movable frame is a linear sliding rail.

[0017] In the present invention, the outer frame is a U-shaped frame.

[0018] In the present invention, the rack of the movable frame is fixedly connected to the connecting plate through a first fixing pin and a second fixing pin at the protruding end protruding from the cross through hole of the positioning rotating shaft.

[0019] In the present invention, a rotating shaft seat is fixedly provided at the end of the supporting frame plate, and the torsion spring reset unit comprises a reset torsion spring, a torsion spring rotating shaft and an adapter plate. The torsion spring rotating shaft is installed on the rotating shaft seat, and the two ends of the torsion spring rotating shaft extend from the rotating shaft seat. The reset torsion spring is fitted onto the torsion spring rotating shaft, and the ends extending at both ends of the reset torsion spring are respectively fixed on the rotating shaft seat. The handle is connected to the reset torsion spring through a hook in the middle section of the handle. There are two adapter plates, and the two adapter plates are both hinged on the torsion spring rotating shaft. At the same time, the outer ends of the two adapter plates are respectively fixedly connected to the handles, and the inner ends are hinged to the operating end of the movable frame.

[0020] In the present invention, the inner end of the adapter plate is hinged to the operating end of the movable frame through a left rotation axis and a right rotation axis.

[0021] The multi-level positioning small board of the present invention can realize the multi-level angle positioning adjustment of the small board according to the use needs of different passengers. The rotation angle adjustment device structure of the small board is set symmetrically on the left and right, and adopts gear transmission, which can effectively improve the structural strength and connection strength of the adjustment mechanism. There is no connecting rod bracket to support the frame plate, so as to avoid taking up more user space. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1It is a schematic diagram of the overall structure of the small board of the automobile seat backrest with manual multi-stage angle positioning adjustment of the present invention;

[0024] Figure 2 It is a schematic diagram of the exploded structure of the small board of the automobile seat backrest with manual multi-stage angle positioning adjustment of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a fixing frame in a small plate of a car seat backrest with manual multi-stage angle positioning adjustment according to the present invention;

[0026] Figure 4 It is a cross-sectional view of a fixing frame in a small plate of a manual multi-stage angle positioning adjustment of a car seat backrest of the present invention;

[0027] Figure 5 It is a structural schematic diagram of a support frame plate in a small plate of a car seat backrest with manual multi-stage angle positioning adjustment according to the present invention;

[0028] Figure 6 It is a structural schematic diagram of the positioning rotation axis of the small plate of the automobile seat backrest with manual multi-stage angle positioning adjustment of the present invention;

[0029] Figure 7 yes Figure 6 A-A sectional view;

[0030] Figure 8 The present invention is a schematic structural diagram of a movable frame in a small plate of a car seat backrest with manual multi-stage angle positioning adjustment.

[0031] In the figure: 1, support frame; 2, left fixed frame; 3, left main fixed axis; 4, left positioning rotating axis; 5, moving frame; 6, handle; 7, reset torsion spring; 8, left transmission gear; 9, connecting plate; 10, left compression spring; 11, left rotating axis; 12, right rotating axis; 13, torsion spring rotating axis; 14, right main fixed axis; 15, right fixed frame; 16, right positioning rotating axis; 17, right compression spring; 18, right transmission gear Wheel; 19. First fixing pin; 20. Second fixing pin; 21. Support frame plate gear hole; 22. Groove; 23. Guide hole; 24. Limit block; 25. Fixed frame gear hole; 26. Fixed frame through hole; 27. Bolt hole; 28. Mobile frame rack; 29. ​​Mobile frame slide rail; 30. Positioning rotating shaft gear end; 31. Positioning rotating shaft cross through hole; 32. Vertical tooth; 33. Adapter plate; 34. Guide sleeve; 35. Plate surface; 36. Rotating shaft seat. DETAILED DESCRIPTION

[0032] like Figures 1 to 8The manual multi-stage angle positioning and adjustment small panel of the automobile seat back shown in the figure comprises a supporting frame panel 1, a panel surface 35, a left fixing frame 2 and a right fixing frame 15. The panel surface 35 adopts a honeycomb structure and is embedded in the supporting frame panel 1. The left fixing frame 2 and the right fixing frame 15 are both fixedly mounted on the automobile seat back. The supporting frame panel 1 is mounted on the left fixing frame 2 and the right fixing frame 15. The small panel also has a rotation angle adjustment device. The rotation angle adjustment device adjusts the rotation angle of the supporting frame panel by manual control, thereby achieving the function of multi-stage angle adjustment of the small panel, and the supporting frame panel can be locked and positioned after the small panel reaches the required rotation position.

[0033] In the present invention, the supporting frame plate 1 is provided with a supporting frame plate gear hole 21, and the rotation angle adjustment device includes a handle 6, a movable frame 5, a transmission gear, a positioning rotating shaft, a compression spring and a main fixed shaft. The handle 6 is connected to the movable frame 5 through the rotating shaft, and can drive the movable frame 5 to move. The main fixed shaft includes a left main fixed shaft 3 and a right main fixed shaft 14, the compression spring includes a left compression spring 10 and a right compression spring 17, the positioning rotating shaft includes a left positioning rotating shaft 4 and a right positioning rotating shaft 16, and the transmission gear includes a left transmission gear 8 and a right transmission gear 18.

[0034] like Figure 3 , Figure 4 As shown, the left fixing frame 2 and the right fixing frame 15 are fixedly mounted on the car seat backrest through bolt holes 27. The left fixing frame 2 and the right fixing frame 15 are fixing parts, and both have a fixing frame through hole 26 and a fixing frame gear hole 25 processed coaxially with the fixing frame through hole 26.

[0035] like Figure 1 and Figure 2 As shown, the left main fixed shaft 3 and the right main fixed shaft 14 are respectively inserted into the left fixed frame 2 and the right fixed frame 15 after passing through the fixed frame through hole 26 and the fixed frame gear hole 25, and the left main fixed shaft 3 and the right main fixed shaft 14 are coaxially matched with the left positioning rotating shaft 4 and the right positioning rotating shaft 16 respectively. The left positioning rotating shaft 4 is sleeved on the left main fixed shaft 3 and meshed with the fixed frame gear hole 25; the right positioning rotating shaft 16 is sleeved on the right main fixed shaft 14 and meshed with the fixed frame gear hole 25. The left main fixed shaft 3 and the right main fixed shaft 14 are the rotation center axes of the support frame 1.

[0036] like Figure 1 , Figure 6 and Figure 7As shown, the structures of the left positioning rotating shaft 4 and the right positioning rotating shaft 16 are the same, including a positioning rotating shaft gear end 30 and a positioning rotating shaft cross-through hole end 31. The positioning rotating shaft gear end 30 is inserted into the fixed frame gear hole 25 and meshed with the fixed frame gear hole 25. The two can make relative movement along the axial direction of the positioning rotating shaft to achieve a separation or locking state. The positioning rotating shaft cross-through hole end 31 has a cross through hole, that is, the side wall of the positioning rotating shaft cross-through hole end 31 has four holes, and vertical teeth 32 are arranged vertically in the cross through hole. The left transmission gear 8 and the right transmission gear 18 are vertically arranged and meshed with the vertical teeth 32 of the positioning rotating shaft cross-through hole end 31. The end of the positioning rotating shaft cross-through hole end 31 away from the positioning rotating shaft gear end 30 cooperates with the left compression spring 10 and the right compression spring 17, that is, the left compression spring 10 and the right compression spring 17 are sleeved on the end of the positioning rotating shaft cross-through hole end 31 away from the positioning rotating shaft gear end 30.

[0037] like Figure 1 , Figure 2 and Figure 5 As shown, the support frame plate 1 is provided with two arched guide sleeves 34, and a limit block 24 is also provided between the two guide sleeves 34. Each guide sleeve 34 has a semicircular guide hole 23, and the left positioning rotating shaft 4 and the right positioning rotating shaft 16 pass through the two guide holes 23 respectively. The support frame plate 1 is also provided with a limit block 24 between the two guide holes 23. The left transmission gear 8 and the right transmission gear 18 vertically pass through the cross through hole with vertical teeth 32 at the cross through hole end 31 of the positioning rotating shaft, and are installed in the guide hole 23 of the guide sleeve 34 at the rear edge, and are meshed with the vertical teeth 32 at the cross through hole end 31 of the positioning rotating shaft. When the left transmission gear 8 and the right transmission gear 18 rotate under the action of external force, the left positioning rotating shaft 4 and the right positioning rotating shaft 16 are driven by the vertical teeth 32 to move toward or away from each other along the axial direction of the positioning rotating shaft. At this time, the left compression spring 10 and the right compression spring 17 are compressed or extended.

[0038] One end of the left compression spring 10 and the right compression spring 17 are connected to the left positioning rotating shaft 4 and the right positioning rotating shaft 16, and the other end is connected to the limit block 24. The left compression spring 10 and the right compression spring 17 can be compressed or extended along the axial direction under the action of external force.

[0039] like Figure 1 , Figure 2 and Figure 5As shown, the support frame plate gear hole 21 opened on the support frame plate 1 is aligned with the fixed frame gear hole 25, the support frame plate gear hole 21 and the fixed frame gear hole 25 have the same hole structure, the positioning rotation shaft gear end 30 is inserted into the support frame plate gear hole 21 and the fixed frame gear hole 25 in sequence, and both are meshed with the support frame plate gear hole 21 and the fixed frame gear hole 25, the positioning rotation shaft cross hole end 31 passes through the guide hole 23, and the guide hole 23 cooperates with the positioning rotation shaft cross hole end 31, and the support frame plate 1 can move along with the left positioning rotation shaft 4 and the right positioning rotation shaft 16 under the action of external force. It rotates around the left main fixed axis 3 and the right main fixed axis 14, and the left positioning rotating axis 4 and the right positioning rotating axis 16 can make axial movement relative to the support frame plate gear hole 21 and the guide hole 23 under the action of the vertical teeth 32 and the left compression spring 10 and the right compression spring 17. A groove 22 is also provided on the support frame plate 1, and the groove 22 cooperates with the moving frame slide rail 29 of the moving frame 5. The moving frame slide rail 29 can slide relative to the groove 22 along the length direction of the groove 22, and the limit block 24 is used to limit the axial position of the left compression spring 10 and the right compression spring 17.

[0040] like Figure 1 , Figure 2 and Figure 8As shown, a rotating shaft seat 36 is fixedly provided at the end of the supporting frame plate 1, and the rotating shaft connecting the handle 6 and the movable frame 5 is a torsion spring rotating shaft 13, which is installed on the rotating shaft seat 36, and the two ends of the torsion spring rotating shaft 13 extend from the rotating shaft seat 36, and the reset torsion spring 7 is fitted with the torsion spring rotating shaft 13, and the ends extending at both ends of the reset torsion spring 7 are respectively fixed on the rotating shaft seat 36, and the handle 6 is connected to the reset torsion spring 7 through a hook in the middle section of the handle, and there are two adapter plates 33, and the two adapter plates 33 are hinged on the torsion spring rotating shaft 13. The two adapter plates 33 are respectively connected to the handle 6 at their outer ends, and the inner ends are respectively hinged to the operating end of the mobile frame 5 through the left rotating shaft 11 and the right rotating shaft 12. The reset torsion spring 7, the torsion spring rotating shaft 13 and the adapter plate 33 form a torsion spring reset assembly. The operating end of the mobile frame 5 is installed with the reset torsion spring 7 and the handle 6 through the left rotating shaft 11, the right rotating shaft 12, the adapter plate 33 and the torsion spring rotating shaft 13. The handle 6 rotates around the torsion spring rotating shaft 13 through the reset torsion spring 7 under the action of external force. The handle 6 drives the adapter plate 33 to rotate synchronously around the torsion spring shaft 13 during the rotation process, and then pushes the mobile frame 5 to move through the left rotation shaft 11 and the right rotation shaft 12. The reset torsion spring 7 accumulates energy during the rotation process, and returns to the initial state under the action of the elastic restoring force after the external force is eliminated; the middle part of the mobile frame 5 is a linear mobile frame slide rail 29, and the end away from the handle 6 is a U-shaped frame with a rack, and the rack in the U-shaped frame includes a row of mobile frame racks 28 on the left and right sides. The movable frame slide rail 29 is installed in cooperation with the groove 22 provided on the supporting frame plate 1, and the two can slide relative to each other for a certain distance; the movable frame rack 28 radially passes through the cross through hole 31 of the positioning rotating shaft and then extends out, and the rack section of the movable frame rack 28 located in the cross through hole 31 of the positioning rotating shaft is meshed with the left transmission gear 8 and the right transmission gear 18, and the movable frame rack 28 is fixedly connected to the connecting plate 9 through the first fixing pin 19 and the second fixing pin 20 at the protruding end extending out of the cross through hole 31 of the positioning rotating shaft.

[0041] The axial direction of the positioning rotating shaft in the present invention is a through hole, one end of which is a gear end. The gear end 30 of the positioning rotating shaft is coaxially matched with the gear hole 21 of the supporting frame plate and the gear hole 25 of the fixing frame, and the positioning rotating shaft can reciprocate along the axis relative to the gear hole 21 of the supporting frame plate and the gear hole 25 of the fixing frame; and the middle section of the other end is a cross through hole, and the through holes on the front and rear sides of the cross through hole are processed into a tooth shape, where the tooth shape is meshed with the transmission gear, and the terminal end is matched with the compression spring. When the gear rotates, it drives the positioning rotating shaft to move along its axial direction, so that it is inserted into the gear hole 21 of the supporting frame plate or separated, and the compression spring is extended or compressed, thereby fixing the angular position of the supporting frame plate at this time or adjusting the angular position of the supporting frame plate again.

[0042] The rotation process of the small plate of the present invention is as follows:

[0043] When the small plate is locked without angle positioning adjustment, the positioning rotating shaft gear ends 30 of the left positioning rotating shaft 4 and the right positioning rotating shaft 16 pass through the support frame plate gear hole 21 of the support frame plate 1 and are inserted into the fixed frame gear holes 25 of the left fixed frame 2 and the right fixed frame 15, meshing with the support frame plate gear hole 21 and the fixed frame gear hole 25. Under the locking and positioning action of the fixed frame gear hole 25, the circumferential rotation of the left positioning rotating shaft 4 and the right positioning rotating shaft 16 is limited, and the support frame plate 1 cannot rotate around the left main fixed shaft 3 and the right main fixed shaft 14. At the same time, the axial movement is limited under the restriction of the left transmission gear 8 and the right transmission gear 18, and it cannot move axially. At this time, the small plate is in a locked and fixed state of the angle position.

[0044] When the angle of the small plate needs to be adjusted, the handle 6 is pulled, and the handle 6 rotates around the torsion spring shaft 13, and the movable frame 5 is driven to move along the length direction of the groove 22 through the adapter plate 33, and the movable frame rack 28 drives the left transmission gear 8 and the right transmission gear 18 to rotate, thereby driving the left positioning rotating shaft 4 and the right positioning rotating shaft 16 to move axially inward toward each other, so that the positioning rotating shaft gear end 30 is separated from the fixed frame gear hole 25 and is free from the constraint of the fixed frame gear hole 25, but the positioning rotating shaft gear end 30 is still in a meshing state with the support frame plate gear hole 21, so that the support frame plate 1 is synchronously linked with the left positioning rotating shaft 4 and the right positioning rotating shaft 16, and the left compression spring 10 and the right compression spring 17 are compressed during the inward movement of the left positioning rotating shaft 4 and the right positioning rotating shaft 16. When the positioning rotating shaft gear end 30 is disengaged from the fixing frame gear hole 25, the locking positioning of the fixing frame gear hole 25 is eliminated, and the small plate is in an angular position adjustable state. At this time, under the action of external force, the supporting frame plate 1 and the left positioning rotating shaft 4 and the right positioning rotating shaft 16 rotate synchronously around the corresponding left main fixed shaft 3 and right main fixed shaft 14. Since the supporting frame plate gear hole 21 and the positioning rotating shaft gear end 30 are still in a meshing state, the supporting frame plate 1 can be multi-stage angularly adjusted under the gear meshing limit to reach the required adjustment angle position, and the gear meshing ensures the accuracy of the supporting frame plate 1 during rotation and avoids slipping of the supporting frame plate 1 during rotation.

[0045] When the small plate reaches the required adjustment position, the handle 6 is released, and the moving frame 5 slides in the opposite direction under the action of the reset torsion spring 7, and the moving frame rack 28 pushes the left transmission gear 8 and the right transmission gear 18 to rotate in the opposite direction. Under the transmission of the left transmission gear 8 and the right transmission gear 18 and the extension of the left compression spring 10 and the right compression spring 17, the left positioning rotating shaft 4 and the right positioning rotating shaft 16 move axially outward in the opposite direction until the reset torsion spring 7, the left compression spring 10 and the right compression spring 17 return to the initial state before adjustment. In this process, the positioning rotating shaft gear end 30 is reinserted into the fixed frame gear hole 25, and the small plate returns to the angular position locked and fixed state, and the supporting frame plate 1 can no longer rotate around the left main fixed axis 3 and the right main fixed axis 14. The small plate angle is locked, and the positioning adjustment is completed.

[0046] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A manual multi-level angle positioning and adjustment small board for a car seat back, comprising a support frame, a board surface, a left fixing frame and a right fixing frame, wherein the board surface is embedded in the support frame, the left fixing frame and the right fixing frame are respectively fixedly mounted on the car seat back, and the support frame is mounted on the left fixing frame and the right fixing frame, characterized in that: The small plate also has a rotation angle adjustment device, which adjusts the rotation angle of the support frame plate through manual control, thereby achieving the function of multi-stage angle adjustment of the small plate, and can lock and position the support frame plate after the small plate reaches the required rotation position; the support frame plate is provided with a support frame plate gear hole, and the rotation angle adjustment device includes a handle, a movable frame, a transmission gear, a positioning rotation shaft, a compression spring and a main fixed shaft. The handle is connected to the movable frame through the rotation shaft, which can drive the movable frame to move. The main fixed shaft includes a left main fixed shaft and a right main fixed shaft, the compression spring includes a left compression spring and a right compression spring, the positioning rotation shaft includes a left positioning rotation shaft and a right positioning rotation shaft, and the transmission gear includes a left transmission gear and a right transmission gear, wherein, The left fixing frame and the right fixing frame are provided with fixing frame through holes and fixing frame gear holes processed coaxially with the fixing frame through holes. The left main fixing shaft and the right main fixing shaft are respectively inserted into the fixing frame through holes and the fixing frame gear holes. The fixing frame gear holes have the same structure as the supporting frame plate gear holes and are coaxially arranged. The left-side positioning rotating shaft is fitted onto the left-side main fixed shaft, and the right-side positioning rotating shaft is fitted onto the right-side main fixed shaft. The left-side positioning rotating shaft and the right-side positioning rotating shaft have the same structure, including a positioning rotating shaft gear end and a positioning rotating shaft cross-through hole end. The positioning rotating shaft gear ends are successively inserted into the supporting frame plate gear hole and the fixing frame gear hole, and are both meshed with the supporting frame plate gear hole and the fixing frame gear hole. The positioning rotating shaft cross-through hole end has a cross through hole, and vertical teeth are arranged in the vertical direction of the cross through hole. The left transmission gear and the right transmission gear are arranged vertically, and the left transmission gear and the right transmission gear are installed in the guide hole arranged on the support frame plate after passing through the cross through hole vertically, and the left transmission gear and the right transmission gear are meshed with the vertical teeth at the end of the cross through hole of the positioning rotation shaft; One end of the left compression spring and the right compression spring is sleeved on the end of the left positioning rotating shaft and the right positioning rotating shaft away from the gear end of the positioning rotating shaft, and the other end is connected to the limit block arranged on the support frame plate; the support frame plate is provided with two arched guide sleeves, the limit block is arranged between the two guide sleeves, the guide hole is a semicircular hole in the guide sleeve, and the left positioning rotating shaft and the right positioning rotating shaft pass through the two guide holes respectively; One end of the mobile frame connected to the torsion spring reset unit is the operating end, the middle part is the mobile frame slide rail, and the other end is an outer frame with a rack. The rack in the outer frame includes a row of mobile frame racks on the left and right sides, and the mobile frame rack passes through the cross through hole of the positioning rotating shaft and then extends out. The mobile frame rack is meshed with the left transmission gear and the right transmission gear at the rack section located in the cross through hole of the positioning rotating shaft, and the mobile frame rack is connected to the connecting plate at the protruding end extending out of the cross through hole of the positioning rotating shaft; a groove is provided on the support frame plate, and the groove cooperates with the mobile frame slide rail of the mobile frame, and the mobile frame slide rail can slide relative to the groove along the length direction of the groove; The rotation angle adjustment device drives the transmission gear to rotate through the handle and the movable frame, and then drives the positioning rotating shaft to move, so that the positioning rotating shaft can be freed from the constraint of the gear hole of the fixed frame, thereby adjusting the support frame plate. At the same time, due to the meshing restriction of the gear hole of the support frame plate on the gear end of the positioning rotating shaft, multi-level angle adjustment of the support frame plate can be achieved.

2. The manual multi-stage angle positioning and adjustment small board for a car seat backrest according to claim 1 is characterized in that: The sliding rails of the movable rack are linear sliding rails.

3. The manual multi-stage angle positioning and adjustment small board for a car seat backrest according to claim 1 is characterized in that: The outer frame is a U-shaped frame.

4. The manual multi-stage angle positioning and adjustment small board for a car seat backrest according to claim 1, characterized in that: The moving rack is fixedly connected to the connecting plate through a first fixing pin and a second fixing pin at the protruding end of the protruding end of the positioning rotating shaft cross through hole.

5. The manual multi-stage angle positioning and adjusting automobile seat back panel according to any one of claims 2 to 4, characterized in that: A rotating shaft seat is fixedly provided at the end of the supporting frame plate, and the rotating shaft is a torsion spring rotating shaft, which is installed on the rotating shaft seat, and both ends of the torsion spring rotating shaft extend from the rotating shaft seat, and the reset torsion spring is fitted on the torsion spring rotating shaft, and the ends of the reset torsion spring at both ends are respectively fixed on the rotating shaft seat, and the handle is connected to the reset torsion spring through a hook in the middle section of the handle. There are two adapter plates, and the two adapter plates are hinged on the torsion spring rotating shaft. At the same time, the outer ends of the two adapter plates are respectively fixedly connected to the handles, and the inner ends are hinged to the operating end of the movable frame.

6. The manual multi-stage angle positioning and adjustment vehicle seat back panel according to claim 5, characterized in that: The inner end of the adapter plate is hinged to the operating end of the movable frame through a left rotating shaft and a right rotating shaft respectively.

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