Chair body angle adjusting structure and child safety seat

Abstract

The application provides a chair body angle adjusting structure and a child safety seat, which comprises a base, an electric adjusting assembly, a manual adjusting assembly and an angle adjusting assembly, the electric adjusting assembly and the manual adjusting assembly are connected with the angle adjusting assembly, the electric adjusting assembly and the angle adjusting assembly are connected in a transmission connection state and a sliding connection state, the angle adjusting assembly is moved to drive the inclination angle adjustment of the chair body; when in the transmission connection state, the electric adjusting assembly is worked to drive the angle adjusting assembly to move to realize the inclination angle adjustment of the chair body; when in the sliding connection state, the manual adjusting assembly is moved to drive the angle adjusting assembly to move to realize the inclination angle adjustment of the chair body. The application enables parents or users to select a suitable inclination angle adjustment mode according to actual needs, the electric adjusting mode is suitable for daily use, and the manual adjusting mode is not limited by power supply, thereby improving the use convenience, safety and flexibility.

Description

Technical Field

[0001] This invention relates to the field of automotive safety products technology, and more specifically, to a seat angle adjustment structure and a child safety seat. Background Technology

[0002] With continuous upgrades in consumption and industry technology, more and more parents are beginning to value the safety of child car seats, while also paying more attention to their ease of use and versatility. They hope that the seats can be adapted to various usage scenarios. Specifically, some parents want the seats to be able to freely adjust their recline angle to meet the different needs of their children. However, currently available child car seats either use electric adjustment to achieve the seat angle adjustment or require manual operation, which is not convenient enough. Summary of the Invention

[0003] To address at least one of the aforementioned problems, the present invention first provides a chair angle adjustment structure, including a base, an electric adjustment component, a manual adjustment component, and an angle adjustment component adapted to be connected to the chair body. Both the electric adjustment component and the manual adjustment component are connected to the angle adjustment component. The electric adjustment component and the angle adjustment component are connected in two states: a transmission connection state and a sliding connection state. Movement of the angle adjustment component can adjust the tilt angle of the chair body. In the transmission connection state, the electric adjustment component moves the angle adjustment component to adjust the tilt angle of the chair body. In the sliding connection state, movement of the manual adjustment component moves the angle adjustment component to adjust the tilt angle of the chair body.

[0004] Optionally, the base is connected to a fixing plate, the chair body is connected to a first chair body fixing rod and a second chair body fixing rod, the fixing plate is provided with a first slide rail slidably connected to the first chair body fixing rod and a second slide rail slidably connected to the second chair body fixing rod, and the angle adjustment component is connected to the first chair body fixing rod.

[0005] Optionally, the angle adjustment assembly includes a gearbox and a chair body connecting bracket. The two ends of the chair body connecting bracket are respectively hinged to the gearbox and the first chair body fixing rod. Both the electric adjustment assembly and the manual adjustment assembly are connected to the gearbox.

[0006] Optionally, the electric adjustment assembly includes a drive motor, a lead screw, and a crankset. The drive motor is connected to the lead screw and can drive the lead screw to rotate synchronously. The crankset is installed inside the gearbox, and the lead screw passes through the gearbox. The gearbox can move back and forth along the lead screw. When in the transmission connection state, the crankset and the lead screw are threadedly connected. The drive motor drives the lead screw to rotate, the lead screw drives the crankset to move, which in turn drives the gearbox to move. The gearbox drives the chair body connecting bracket to move, which in turn drives the chair body to move, thereby adjusting the tilt angle of the chair body relative to the base. When in the sliding connection state, the crankset and the lead screw are separated. The manual adjustment assembly moves, driving the crankset to move. The gearbox drives the chair body connecting bracket to move, which in turn drives the chair body to move, thereby adjusting the tilt angle of the chair body relative to the base.

[0007] Optionally, the electric adjustment assembly further includes a bearing and a bearing housing connected to each other, the bearing housing being connected to the base, and the end of the lead screw away from the drive motor being connected to the bearing.

[0008] Optionally, the manual adjustment component includes a pull cable and a crankset release mechanism. The crankset release mechanism is installed inside the crank housing. The pull cable passes through the crank housing and is connected to the crankset release mechanism. The pull cable pulls the crankset release mechanism to move the crankset, thereby causing the crankset to move and disengage from the lead screw.

[0009] Optionally, the crankset includes a first crankset and a second crankset, both of which are slidably connected to the crank housing. The crankset release mechanism has a first guide groove and a second guide groove. The first crankset has a first protrusion slidably connected to the first guide groove, and the second crankset has a second protrusion slidably connected to the second guide groove. When in the transmission connection state, the first protrusion and the second protrusion are close to each other, and when in the sliding connection state, the first protrusion and the second protrusion are far apart from each other.

[0010] Optionally, the manual adjustment assembly further includes a reset member, the front and rear ends of which are connected to the gearbox and the gear plate release member, respectively.

[0011] Optionally, the manual adjustment assembly further includes a release handle movably connected to the base, and the front and rear ends of the pull cable are respectively connected to the release handle and the crankset release component.

[0012] Compared to existing technologies, the seat angle adjustment structure in this invention uses either an electric or manual adjustment component to drive the angle adjustment component, allowing for adjustment of the seat tilt angle via either electric or manual methods. This enables parents or users to choose the appropriate tilt angle adjustment method according to their actual needs. The electric adjustment method is suitable for daily use, allowing for adjustment of the seat tilt angle via the electric adjustment component, while the manual adjustment method provides a backup adjustment method when the electric adjustment component stops working, and is not limited by the power supply, thus improving the convenience, safety, and flexibility of using the child safety seat.

[0013] In addition, the present invention provides a child safety seat, including the seat angle adjustment structure described above.

[0014] Compared to existing technologies, the child safety seat described in this invention has the same advantages as the aforementioned seat angle adjustment structure, which will not be repeated here. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the chair angle adjustment structure according to an embodiment of the present invention;

[0016] Figure 2 This is a partial exploded view of the chair angle adjustment structure according to an embodiment of the present invention;

[0017] Figure 3 This is a cross-sectional view of the chair angle adjustment structure in its initial position according to an embodiment of the present invention;

[0018] Figure 4 This is a partial view of the chair angle adjustment structure in its initial position according to an embodiment of the present invention. Figure 1 ;

[0019] Figure 5 This is a partial view of the chair angle adjustment structure in its initial position according to an embodiment of the present invention. Figure 2 ;

[0020] Figure 6 This is a partial structure of the chair angle adjustment structure in an embodiment of the present invention during manual adjustment. Figure 1 ;

[0021] Figure 7 This is a partial structure of the chair angle adjustment structure in an embodiment of the present invention during manual adjustment. Figure 2 ;

[0022] Figure 8 This is a structural diagram of the chair angle adjustment structure in an embodiment of the present invention when adjusted to the maximum reclining position.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Base; 2. Electric adjustment assembly; 21. Drive motor; 22. Lead screw; 23. Bearing; 25. First chainring; 251. First protrusion; 26. Second chainring; 261. Second protrusion; 3. Manual adjustment assembly; 31. Pull cable; 32. Chainring release mechanism; 321. First guide groove; 322. Second guide groove; 33. Reset mechanism; 34. Release handle; 4. Angle adjustment assembly; 41. Chainring housing; 42. Chair body connecting bracket; 5. Fixing plate; 51. First slide rail; 52. Second slide rail; 6. First chair body fixing rod; 7. Second chair body fixing rod. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. The accompanying drawings of embodiments of the present invention use a coordinate system XY, where the positive direction of the X-axis represents the left, the negative direction of the X-axis represents the right, the positive direction of the Y-axis represents the front, and the negative direction of the Y-axis represents the rear.

[0028] This invention provides a chair angle adjustment structure, combined with Figures 1 to 8 As shown, the chair includes a base 1, an electric adjustment component 2, a manual adjustment component 3, and an angle adjustment component 4 adapted to connect to the chair body. Both the electric adjustment component 2 and the manual adjustment component 3 are connected to the angle adjustment component 4. The electric adjustment component 2 and the angle adjustment component 4 are connected to each other in two states: a transmission connection state and a sliding connection state. The movement of the angle adjustment component 4 can adjust the tilt angle of the chair body. In the transmission connection state, the electric adjustment component 2 moves the angle adjustment component 4 to adjust the tilt angle of the chair body. In the sliding connection state, the manual adjustment component 3 moves the angle adjustment component 4 to adjust the tilt angle of the chair body.

[0029] The seat is movably mounted on the base 1, and its tilt angle relative to the base 1 can be adjusted to accommodate different needs of children. The electric adjustment component 2 is electrically connected to the circuit board. The operation of the electric adjustment component 2 can be controlled by setting operation buttons on the seat or by connecting to the car's infotainment system and mobile APP via Bluetooth. This allows parents to adjust the seat's tilt angle at any time according to the child's seating position when driving alone with the child. The seat can also be designed with a zero-gravity reclining angle. By connecting to the car's infotainment system or the onboard monitoring device or the built-in monitoring device, the child's status can be monitored. When the child falls asleep, the movement of the electric adjustment component 2 can be controlled, so that the seat automatically adjusts to the zero-gravity reclining angle. In addition, the operation of the electric adjustment component 2 can also be controlled by one button or voice.

[0030] The manual adjustment component 3 and the electric adjustment component 2 can be selected to drive the angle adjustment component 4. That is, when the electric adjustment component 2 and the angle adjustment component 4 are in a transmission connection state, the manual adjustment component 3 will not drive the angle adjustment component 4. At this time, the electric adjustment component 2 can drive the angle adjustment component 4 when it is powered on. When the electric adjustment component 2 and the angle adjustment component 4 are in a sliding connection state, the electric adjustment component 2 will not drive the angle adjustment component 4. At this time, the manual adjustment component 3 can drive the angle adjustment component 4 under human power.

[0031] In this embodiment, the seat angle adjustment structure drives the angle adjustment component 4 to move via the electric adjustment component 2 or the manual adjustment component 3, allowing the seat tilt angle to be adjusted either electrically or manually. This enables parents or users to choose the appropriate tilt angle adjustment method according to their actual needs. The electric adjustment method is suitable for daily use and can be used to adjust the seat tilt angle via the electric adjustment component 2. The manual adjustment method provides a backup adjustment method when the electric adjustment component 2 stops working, and is not limited by the power supply, thus improving the convenience, safety, and flexibility of the child safety seat.

[0032] Optionally, combined Figure 1 , Figure 3 , Figure 8As shown, the base 1 is connected to a fixing plate 5, and the chair body is connected to a first chair body fixing rod 6 and a second chair body fixing rod 7. The fixing plate 5 is provided with a first slide rail 51 that is slidably connected to the first chair body fixing rod 6 and a second slide rail 52 that is slidably connected to the second chair body fixing rod 7. The angle adjustment component 4 is connected to the first chair body fixing rod 6. The chair body is slidably connected to the fixing plate 5 through the first chair body fixing rod 6 and the second chair body fixing rod 7 to achieve a sliding connection between the chair body and the base 1. The first chair body fixing rod 6 and the second chair body fixing rod 7 are arranged side by side. When the angle adjustment component 4 moves the first chair body fixing rod 6 within the first slide rail 51, the second chair body fixing rod 7 also moves synchronously within the second slide rail 52, which means that the tilt angle of the chair body changes, and the structure is stable and reliable.

[0033] Optionally, combined Figure 1 , Figure 2 , Figure 3 , Figure 8 As shown, the angle adjustment component 4 includes a jaw box 41 and a chair body connecting bracket 42. The two ends of the chair body connecting bracket 42 are hinged to the jaw box 41 and the first chair body fixing rod 6, respectively. Both the electric adjustment component 2 and the manual adjustment component 3 are connected to the jaw box 41. Both the electric adjustment component 2 and the manual adjustment component 3 can independently move the jaw box 41, which in turn moves the chair body connecting bracket 42, allowing the chair body to change its tilt angle. In this embodiment, the hinged chair body connecting bracket 42 between the jaw box 41 and the chair body not only reduces the force required for the electric adjustment component 2 or the manual adjustment component 3, saving effort and providing flexible adjustment without jamming, but also improves the user experience.

[0034] Optionally, combined Figures 1 to 8 As shown, the electric adjustment assembly 2 includes a drive motor 21, a lead screw 22, and a crankset. The drive motor 21 is connected to the lead screw 22 and can drive the lead screw 22 to rotate synchronously. The crankset is installed in the crank housing 41, and the lead screw 22 passes through the crank housing 41. The crank housing 41 can move back and forth along the lead screw 22. When in the transmission connection state, the crankset and the lead screw 22 are threadedly connected. The drive motor 21 drives the lead screw 22 to rotate. The lead screw 22 drives the crankset to move, thereby driving the crank housing 41 to move. The crank housing 41 drives the chair body connecting bracket 42 to move, thereby driving the chair body to move, thus adjusting the tilt angle of the chair body relative to the base 1. When in the sliding connection state, the crankset and the lead screw 22 are separated. The manual adjustment assembly 3 moves, driving the crankset to move. The crank housing 41 drives the chair body connecting bracket 42 to move, thereby driving the chair body to move, thus adjusting the tilt angle of the chair body relative to the base 1.

[0035] The lead screw 22 has an external thread, and the sprocket has an internal thread suitable for engaging with the external thread. The lead screw 22 and the sprocket are connected by a threaded connection to achieve transmission. The drive motor 21 is fixedly connected to the base 1 through a motor mounting bracket, making the connection more secure. The drive motor 21 is powered by a battery pack or by an external power supply through a power plug. The drive motor 21 is electrically connected to the circuit board. The working status of the drive motor 21 can be controlled by setting operation buttons on the seat or by connecting to the car's infotainment system and mobile APP via Bluetooth. This allows parents to adjust the seat's tilt angle at any time according to the child's seating position when driving alone with the child. When the child falls asleep, the movement of the drive motor 21 can be controlled to automatically adjust the seat to a zero-gravity reclining position. When in a sliding connection state, the gearbox 41 can move freely relative to the lead screw 22.

[0036] Optionally, combined Figures 1 to 8 As shown, the electric adjustment assembly 2 also includes a bearing 23 and a bearing seat connected to each other. The bearing seat is connected to the base 1, and the end of the lead screw 22 away from the drive motor 21 is connected to the bearing 23. The bearing 23 is fixed on the base 1 through the bearing seat. The bearing 23 is connected to the lead screw 22 to ensure the stability and reliability of the lead screw 22's operation, thereby ensuring that the tilt angle adjustment of the chair body can be carried out smoothly.

[0037] Optionally, combined Figures 1 to 8 As shown, the manual adjustment component 3 includes a pull cable 31 and a crankset release component 32. The crankset release component 32 is installed inside the crank housing 41. The pull cable 31 passes through the crank housing 41 and is connected to the crankset release component 32. The pull cable 31 pulls the crankset release component 32 to move, thereby moving the crankset so that the crankset is separated from the lead screw 22.

[0038] The pull cable 31 is a thin rope that passes through the gearbox 41 and connects to the chainring release mechanism 32. Users can manually adjust the tilt angle of the chair by operating the pull cable 31. When manual adjustment of the chair tilt angle is required, the user pulls the pull cable 31, which moves the chainring release mechanism 32. The chainring release mechanism 32 moves the chainring, thus separating the chainring from the lead screw 22. In other words, in manual adjustment mode, the chainring is not connected to the electric adjustment component 2. At this time, it is easy to switch to manual adjustment to adjust the tilt angle of the chair, providing more flexibility and convenience.

[0039] Optionally, combined Figures 1 to 8As shown, the crankset includes a first crankset 25 and a second crankset 26, both of which are slidably connected to the crank housing 41. The crankset release mechanism 32 has a first guide groove 321 and a second guide groove 322. The first crankset 25 has a first protrusion 251 slidably connected to the first guide groove 321, and the second crankset 26 has a second protrusion 261 slidably connected to the second guide groove 322. When in the transmission connection state, the first protrusion 251 and the second protrusion 261 are close to each other. When in the sliding connection state, the first protrusion 251 and the second protrusion 261 are far apart from each other; the manual adjustment assembly 3 also includes a reset member 33, the front and rear ends of which are respectively connected to the gearbox 41 and the gear plate release member 32; the manual adjustment assembly 3 also includes a release handle 34 movably connected to the base 1, the front and rear ends of the pull cable 31 are respectively connected to the release handle 34 and the gear plate release member 32, the release handle 34 is exposed and has a large size to facilitate the user to pull the pull cable 31 through the release handle 34.

[0040] The first and second chainrings 25 and 26 can move relative to each other in the left-right direction. The guide grooves are inclined or arc-shaped, with their front ends close to each other and their rear ends far apart. When the chair tilt angle is adjusted electrically, it is in a transmission connection state, with the first protrusion 251 located at the front end of the first guide groove 321 and the second protrusion 261 located at the front end of the second guide groove 322. When the chair tilt angle is adjusted manually, it is in a sliding connection state, with the first protrusion 251 located at the rear end of the first guide groove 321 and the second protrusion 261 located at the rear end of the second guide groove 322. The reset member 33 is preferably a compression spring, which can push the chainring release member 32 to automatically reset when the pull cable 31 is released.

[0041] In this embodiment, a first sprocket 25 and a second sprocket 26 capable of relative movement are provided, allowing easy switching between electric and manual adjustment of the chair's tilt angle. The structure is simple and reliable. Specifically, when the seat is powered on and the reclining angle needs adjustment, the drive motor 21 starts the drive screw 22 to rotate. The internal threads of the first sprocket 25 and the second sprocket 26 in the gearbox 41 are screwed into the external threads of the screw 22. Under the elastic force of the reset member 33, the first sprocket 25 and the second sprocket 26 in the gearbox 41 do not separate from the screw 22. The rotation of the screw 22 drives the first sprocket 25 and the second sprocket 26 to move in the front-back direction, thereby driving the gearbox 41 to move back and forth. The chair body connecting bracket 42, driven by the translational movement of the gearbox 41, drives the chair body to adjust its tilt angle through a hinged connection. When the desired angle is reached, the drive motor 21 is stopped, thus locking the chair body's tilt angle. When the seat is powered off and the reclining angle needs adjustment, the lock is released by pulling the lever. Handle 34, the release handle 34 pulls the cable 31, the other end of the cable 31 is connected and fixed to the chainring release member 32. When the release handle 34 pulls the cable 31, the chainring release member 32 moves forward and compresses the reset member 33 between it and the gearbox 41. When the chainring release member 32 moves forward, it simultaneously moves the first chainring 25 and the second chainring 26 below to the left and right respectively through the first guide groove 321 and the second guide groove 322 provided on both sides. The internal threads of the first chainring 25 and the second chainring 26 are connected to the lead screw 2. When the external thread of 2 is separated, the user can push the chair body to adjust the tilt angle. When the desired angle is reached, the release handle 34 is released, and the first sprocket 25 and the second sprocket 26 move closer to each other under the elastic force of the reset member 33 until the internal threads of the first sprocket 25 and the second sprocket 26 engage with the external thread of the lead screw 22, thus locking the tilt angle. Both the electric and manual adjustment methods are stepless, meaning that the chair body tilt angle can be stopped at any position within the stroke, providing a good user experience.

[0042] Another embodiment of the present invention provides a child safety seat, including the seat angle adjustment structure described above.

[0043] In this embodiment, the child safety seat uses either the electric adjustment component 2 or the manual adjustment component 3 to drive the angle adjustment component 4, allowing for adjustment of the seat's tilt angle via either electric or manual methods. This enables parents or users to choose the appropriate tilt angle adjustment method according to their actual needs. The electric adjustment method is suitable for daily use, and the seat tilt angle can be adjusted via the electric adjustment component 2. The manual adjustment method provides a backup adjustment method when the electric adjustment component 2 stops working, and is not limited by the power supply, thus improving the convenience, safety, and flexibility of the child safety seat.

[0044] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A chair body angle adjustment structure, characterized in that, The system includes a base (1), an electric adjustment assembly (2), a manual adjustment assembly (3), and an angle adjustment assembly (4) suitable for connection to the chair body. The angle adjustment assembly (4) includes a gearbox (41) and a chair body connecting bracket (42) connected to each other, and the chair body connecting bracket (42) is connected to the chair body. The electric adjustment assembly (2) includes a drive motor (21), a lead screw (22), and a gearbox. The drive motor (21) is connected to the lead screw (22) and can drive the gearbox. The lead screw (22) rotates synchronously, the toothed plate is installed in the toothed box (41), the lead screw (22) passes through the toothed box (41), and the toothed box (41) can move back and forth along the lead screw (22); the manual adjustment component (3) includes a pull cable (31) and a toothed plate release component (32), the toothed plate release component (32) is installed in the toothed box (41), and the pull cable (31) passes through the toothed box (41) and is connected to the toothed plate release component (32); The toothbrush includes a first toothbrush (25) and a second toothbrush (26), both of which are slidably connected to the toothbrush housing (41) from left to right. The toothbrush release member (32) is provided with a first guide groove (321) and a second guide groove (322). The first toothbrush (25) is provided with a first protrusion (251) slidably connected to the first guide groove (321), and the second toothbrush (26) is provided with a second protrusion (261) slidably connected to the second guide groove (322). Both the electric adjustment component (2) and the manual adjustment component (3) are connected to the angle adjustment component (4). The electric adjustment component (2) and the angle adjustment component (4) are connected to each other in a transmission connection state and a sliding connection state. The movement of the angle adjustment component (4) can drive the tilt angle adjustment of the chair body. When in the transmission connection state, the electric adjustment component (2) drives the angle adjustment component (4) to move to realize the tilt angle adjustment of the chair body. Specifically, the first protrusion (251) and the second protrusion (261) move closer to each other so that the first toothed plate (25) and the second toothed plate (26) are threadedly connected to the lead screw (22). The drive motor (21) drives the lead screw (22) to rotate. The lead screw (22) drives the toothed plate to move to drive the toothed box (41). When the chair body moves, the gearbox (41) drives the chair body connecting bracket (42) to move, thereby moving the chair body and adjusting the tilt angle of the chair body relative to the base (1). When in the sliding connection state, the manual adjustment component (3) moves, driving the angle adjustment component (4) to move, thereby adjusting the tilt angle of the chair body. Specifically, the pull cable (31) pulls the tooth plate release component (32) to move, thereby moving the tooth plate. The first protrusion (251) and the second protrusion (261) move away from each other, so that the first tooth plate (25) and the second tooth plate (26) are separated from the lead screw (22). When the user pushes the chair body, the gearbox (41) drives the chair body connecting bracket (42) to move, thereby moving the chair body and adjusting the tilt angle of the chair body relative to the base (1).

2. The chair angle adjustment structure according to claim 1, characterized in that, The base (1) is connected to a fixing plate (5), the chair body is connected to a first chair body fixing rod (6) and a second chair body fixing rod (7), the fixing plate (5) is provided with a first slide rail (51) slidably connected to the first chair body fixing rod (6) and a second slide rail (52) slidably connected to the second chair body fixing rod (7), and the angle adjustment component (4) is connected to the first chair body fixing rod (6).

3. The chair angle adjustment structure according to claim 2, characterized in that, The two ends of the chair body connecting bracket (42) are respectively hinged to the dental box (41) and the first chair body fixing rod (6), and the electric adjustment component (2) and the manual adjustment component (3) are both connected to the dental box (41).

4. The chair angle adjustment structure according to claim 3, characterized in that, The electric adjustment assembly (2) also includes a bearing (23) and a bearing seat connected to each other. The bearing seat is connected to the base (1), and the end of the lead screw (22) away from the drive motor (21) is connected to the bearing (23).

5. The chair angle adjustment structure according to claim 4, characterized in that, The manual adjustment assembly (3) also includes a reset member (33), the front and rear ends of which are connected to the tooth box (41) and the tooth plate release member (32), respectively.

6. The chair angle adjustment structure according to claim 4, characterized in that, The manual adjustment assembly (3) also includes a release handle (34) movably connected to the base (1), and the front and rear ends of the pull cable (31) are respectively connected to the release handle (34) and the crank release component (32).

7. A child safety seat, characterized in that, Includes the chair angle adjustment structure as described in any one of claims 1-6.

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