Seat capable of being adjusted at large pitching angle

Abstract

The utility model discloses a pitching large-angle adjusting chair which comprises a chair back assembly, a chair seat assembly and a supporting assembly, a first pitching adjusting mechanism is arranged between the chair seat assembly and the supporting assembly, the first pitching adjusting mechanism comprises a tray, and the tray is configured to be connected with the chair seat assembly and the supporting assembly; the chair seat assembly can rotate up and down relative to the supporting assembly; the chair back assembly comprises a chair back and a back bracket supported on the rear side of the chair back, a second pitching adjusting mechanism is arranged between the back bracket and the chair seat assembly, and the second pitching adjusting mechanism is configured to enable the back bracket to be rotationally adjusted back and forth relative to the chair seat assembly; a third pitching adjusting mechanism is arranged between the chair back and the back bracket, and the third pitching adjusting mechanism is configured to enable the chair back to be rotationally adjusted back and forth relative to the back bracket. According to the pitching large-angle adjusting seat, the pitching angle of the seat back can be adjusted through the at least three rotating nodes, the pitching adjusting angle is large, and the use experience is more comfortable.

Description

Technical Field

[0001] The utility model generally relates to the technical field of seats, and in particular to a seat with large pitch angle adjustment. Background Art

[0002] Chairs are commonly used furniture in people's daily lives. With the development of technology, in addition to providing basic sitting functions, seats also have various structures and functions. For example, some office chairs on the current market have the function of adjusting the backrest relative to the seat. When the user feels tired and needs to rest, the backrest can be turned backwards, allowing the user to change from a sitting position to a lying position, which is more comfortable. The pitch adjustment function of this type of seat is usually achieved through a tray at the bottom of the seat. The positioning pins, positioning holes and torsion springs in the tray are used to realize the function of lying down the backrest and adjusting the pitch angle of the backrest.

[0003] However, the angle adjustment range of the existing trays on the market is relatively limited. If the pitch angle of the chair back is adjusted only by the tray, the pitch angle of the chair back is usually 100-130° in the supine state. As a result, the user's experience of lying on their back is quite different from that of lying flat on the bed, and the comfort level is still insufficient.

[0004] In summary, how to expand the pitch adjustment angle of the seat has become the main problem that needs to be solved at present. Summary of the invention

[0005] In view of the above defects or deficiencies in the prior art, it is desirable to provide a seat with a large pitch adjustment angle. In addition to relying on the traditional tray, the pitch adjustment of the chair back is also provided with a second pitch adjustment mechanism between the back support and the seat assembly, and a third pitch adjustment mechanism between the chair back and the back support, so that the chair back can adjust the pitch angle through at least three rotation nodes, and the pitch adjustment angle is large, so that the user experience of the seat in the reclining state is close to lying flat, and has a better comfort.

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

[0007] The present application provides a seat with large pitch adjustment angle, including a backrest assembly, a seat assembly and a support assembly, a first pitch adjustment mechanism is arranged between the seat assembly and the support assembly, the first pitch adjustment mechanism includes a tray, the tray is configured to connect the seat assembly and the support assembly, and allows the seat assembly to rotate up and down relative to the support assembly; the backrest assembly includes a back bracket supporting the backrest on the back side of the backrest, a second pitch adjustment mechanism is arranged between the back bracket and the seat assembly, the second pitch adjustment mechanism is configured to allow the back bracket to rotate forward and backward relative to the seat assembly; a third pitch adjustment mechanism is arranged between the backrest and the back bracket, the third pitch adjustment mechanism is configured to allow the backrest to rotate forward and backward relative to the back bracket; therefore, when the backrest assembly and the seat assembly rotate backward, a large angle of backward tilt is achieved by superimposing the rotation angles of the first pitch adjustment mechanism, the second pitch adjustment mechanism and the third pitch adjustment mechanism.

[0008] Furthermore, the pitch adjustment angle of the seat assembly relative to the support assembly is 0-30°. By setting the first pitch adjustment mechanism, the seat assembly can be pitched relative to the support assembly, which not only drives the chair back connected to the seat assembly to rotate, so that the chair back can have a larger pitch angle; but also enables the seat assembly to tilt upward at a certain angle in the supine state, thereby providing stable support for the user's buttocks.

[0009] Furthermore, the tray includes a seat connection plate connected to the bottom of the seat assembly and a rotating support plate connected to the top of the support assembly, and the seat connection plate is hinged to the rotating support plate. The tray has a simple structure and is hidden at the bottom of the seat assembly, making the overall appearance of the seat simple, and the seat can be adjusted to rise and fall or the backrest can be adjusted to pitch only by turning the handle on the side of the tray, which is easy to operate.

[0010] Furthermore, the pitch adjustment angle of the backrest assembly relative to the seat assembly is 0-30 degrees. By setting a second pitch adjustment mechanism, the backrest assembly can be further pitched relative to the seat assembly, thereby further increasing the pitch adjustment angle of the backrest, making the user experience in the reclining state closer to lying flat, and more comfortable.

[0011] Furthermore, the left and right sides of the back support extend forward to form a seat connection part, and the left and right sides of the seat assembly are connected with support members, which extend upward beyond the upper surface of the seat assembly; the second pitch adjustment mechanism includes a columnar rotating support member and a rotating groove that rotate with each other, the rotating support member is arranged in one of the support member and the seat connection part, and the rotating groove is recessed in the other of the support member and the seat connection part, and the seat connection part rotates forward and backward relative to the support member through the second pitch adjustment mechanism, thereby driving the chair back assembly to be pitch-adjusted relative to the seat assembly. The rotation adjustment between the back support and the seat assembly is achieved through the rotation cooperation of the rotating groove and the rotating support member, the structure is simple, easy to assemble, and the rotation adjustment operation is simple; not only that, the rotation fulcrum between the back support and the seat assembly is located above the seat assembly, closer to the center of gravity of the human body when sitting on the seat, which effectively avoids the chair back from rubbing the user's clothes during the pitch adjustment process, and provides a better user experience.

[0012] Furthermore, the rotating support is arranged on the support, the seat connection part is correspondingly recessed with a rotating groove, a gear adjustment mechanism is also arranged between the seat connection part and the rotating support, the gear adjustment mechanism includes a bayonet that is engaged with each other and a plurality of bayonet holes that are recessed along the circumferential direction and arranged on the side wall of the rotating support, a first connecting groove extending transversely is recessed on the seat connection part, the first connecting groove is connected to the rotating groove, and an adjusting member is slidably connected in the first connecting groove, the bayonet is connected to the adjusting member, and the adjusting member is configured to drive the bayonet to slide forward and backward along the first connecting groove to insert or pull out the bayonet from one of the plurality of bayonet holes. This makes the gear adjustment operation simpler and more convenient; and the bayonet and the bayonet hole are hidden in the first connecting groove and the rotating groove, making the appearance more concise and more beautiful.

[0013] Furthermore, a first elastic reset structure is provided between the rotating support and the seat connection part, and the first elastic reset structure includes a torsion spring, one side arm of the torsion spring acts on the seat connection part, and the other side arm of the torsion spring acts on the rotating support, so that the seat connection part always has a tendency to rotate forward relative to the rotating support. When the chair back is switched from a reclining state to a sitting state, the seat connection part can automatically rotate the chair back assembly to the sitting state by means of the reset elastic force by simply pressing the adjustment part. This makes the pitch adjustment operation of the chair back assembly easier.

[0014] Furthermore, the pitch adjustment angle of the chair back relative to the back support is 0-15°. By setting a third pitch adjustment mechanism, the chair back can be further pitched relative to the back support, thereby further increasing the pitch adjustment angle of the chair back, providing better comfort; and by adjusting the inclination of the chair back, the chair back can be made to fit the user's back better, providing a more comfortable user experience.

[0015] Furthermore, the third pitch adjustment mechanism includes a seat back connector provided on the seat back and a back support connector provided on the back support, and the seat back connector is hinged to the back support connector, so that the seat back connector can rotate forward and backward relative to the back support connector, thereby driving the seat back to rotate forward and backward relative to the back support. This makes the third pitch adjustment mechanism simple and compact in structure, not easily exposed between the seat back and the back support, and makes the pitch adjustment operation relatively simple.

[0016] Furthermore, a second elastic reset structure is provided between the backrest connector and the back support connector, and the second elastic reset structure includes a first spring, one end of the first spring acts on the backrest connector, and the other end of the first spring acts on the back support connector, so that the backrest connector always has a tendency to rotate forward relative to the back support connector. By providing the first spring, the backrest will automatically return to the initial state with the help of the elastic force of the first spring, making the pitch adjustment operation of the backrest assembly easier; and the backrest can not only provide the user with comfortable elastic support with the help of the elastic force of the first spring, but also can automatically rotate to an angle that fits the user's back after being compressed, making the user experience more convenient and comfortable.

[0017] The pitch adjustment seat with large pitch angle provided by the present application not only relies on the traditional tray (i.e., the first pitch adjustment mechanism) for the pitch adjustment of the chair back, but also sets a second pitch adjustment mechanism between the back support and the seat assembly, and sets a third pitch adjustment mechanism between the chair back and the back support, so that the chair back can adjust the pitch angle through at least three rotation nodes, so that the chair back has a pitch angle of at least 150° in the reclining state. The user experience is close to lying flat, with good comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a seat provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the side structure of a seat in a sitting position provided by an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the side structure of a seat in a supine position provided in an embodiment of the present application

[0022] Figure 4 A schematic diagram of the connection structure between the seat assembly and the support assembly provided in an embodiment of the present application;

[0023] Figure 5A schematic diagram of the connection structure between the chair back and the back support provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of the connection structure between the back support connector and the back support provided in an embodiment of the present application;

[0025] Figure 7 A schematic cross-sectional structure diagram of a chair back assembly provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of the connection structure between the support member and the seat connection portion provided in an embodiment of the present application;

[0027] Fig. 9 A schematic cross-sectional structure diagram of a seat connection portion and a rotating support member in a locked state provided by an embodiment of the present application;

[0028] Fig.10 A schematic cross-sectional structure diagram of a seat connection portion and a rotating support member in an active state provided by an embodiment of the present application;

[0029] Fig.11 A schematic diagram of the connection structure between the support member and the rotating support member provided in an embodiment of the present application;

[0030] Fig.12 A schematic diagram of the connection structure between the adjustment member and the seat connection portion provided in an embodiment of the present application;

[0031] Fig.13 A schematic diagram of the connection structure between the limiting member and the seat connecting portion provided in an embodiment of the present application.

[0032] The figures are marked as follows: 1-backrest assembly, 101-first spring, 110-backrest, 111-backrest connecting piece, 120-back support, 121-back support connecting piece, 122-mounting groove, 123-clamping groove, 130-seat connecting part, 131-rotation groove, 132-first connecting groove, 133-limiting groove, 140-pin, 141-second connecting groove, 142-second spring, 150-adjusting piece, 2-seat assembly, 210-support piece, 211-mounting hole, 212-limiting mouth, 220-rotation support piece, 221-clamp, 222-first limiting part, 223-clamping groove, 230-torsion spring, 240-limiting piece, 241-second limiting part, 242-connecting part, 3-support assembly, 4-tray, 410-seat connecting plate, 420-rotation support plate. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0034] Please refer to the attached Figure 1-13 The embodiment of the present application provides a large pitch adjustment chair, comprising a backrest assembly 1, a seat assembly 2 and a support assembly 3, wherein a first pitch adjustment mechanism is arranged between the seat assembly 2 and the support assembly 3, the first pitch adjustment mechanism comprises a tray 4, the tray 4 is configured to connect the seat assembly 2 and the support assembly 3, and enables the seat assembly 2 to rotate up and down relative to the support assembly 3; the backrest assembly 1 comprises a backrest 110 supported by a back support 120 at the rear side of the backrest 110, a second pitch adjustment mechanism is arranged between the back support 120 and the seat assembly 2, the second pitch adjustment mechanism is configured to enable the back support 120 to rotate forward and backward relative to the seat assembly 2; a third pitch adjustment mechanism is arranged between the backrest 110 and the back support 120, the third pitch adjustment mechanism is configured to enable the backrest 110 to rotate forward and backward relative to the back support 120; therefore, when the backrest assembly 1 and the seat assembly 2 rotate backward, a large angle of backward tilt is achieved by superimposing the rotation angles of the first pitch adjustment mechanism, the second pitch adjustment mechanism and the third pitch adjustment mechanism.

[0035] In this embodiment, in addition to relying on the traditional tray 4 (i.e., the first pitch adjustment mechanism), the pitch adjustment of the chair back 1 also includes a second pitch adjustment mechanism between the back support 120 and the seat assembly 2, and a third pitch adjustment mechanism between the chair back 110 and the back support 120, so that the chair back 1 can adjust the pitch angle through at least three rotation nodes, and thus the chair back 1 has a pitch angle of at least 150° in the reclining state. The user experience is close to lying flat, with good comfort.

[0036] Please refer to the attached Figure 2-3 In some embodiments of the present application, the pitch adjustment angle of the seat assembly 2 relative to the support assembly 3 is 0-30°. By providing the first pitch adjustment mechanism, the seat assembly 2 can be pitched relative to the support assembly 3, which not only drives the chair back 110 connected to the seat assembly 2 to rotate, so that the chair back 110 can have a larger pitch angle; but also enables the seat assembly 2 to tilt upward at a certain angle in the supine state, thereby providing stable support for the user's buttocks.

[0037] Please refer to the attached Figure 4In some embodiments of the present application, the tray 4 includes a seat connection plate 410 connected to the bottom of the seat assembly 2 and a rotating support plate 420 connected to the top of the support assembly 3, and the seat connection plate 410 is hinged to the rotating support plate 420. The tray 4 is a common component of an office chair, and its structure is simple and hidden at the bottom of the seat assembly 2, so that the overall appearance of the seat is simple, and the seat can be adjusted to rise and fall or the backrest can be adjusted to pitch, which is easy to operate. The tray 4 provided in the embodiment of the present application is a prior art, and the structure can refer to a swivel chair tray provided by an existing patent (application number: CN201520781768.7), and no further elaboration is given.

[0038] Please refer to the attached Figure 2-3 In some embodiments of the present application, the pitch adjustment angle of the backrest assembly 1 relative to the seat assembly 2 is 0-30°. By providing a second pitch adjustment mechanism, the backrest assembly 1 can be further pitched relative to the seat assembly 2, thereby further increasing the pitch adjustment angle of the backrest 110, so that the user experience in the reclining state of the seat is close to lying flat, and the comfort is better.

[0039] Please refer to the attached Figure 8 In some embodiments of the present application, the left and right sides of the back support 120 extend forward to form a seat connection part 130, and the left and right sides of the seat assembly 2 are connected with support members 210, and the support member 210 extends upward beyond the upper surface of the seat assembly 2; the second pitch adjustment mechanism includes a columnar rotating support member 220 and a rotating groove 131 that rotate with each other, the rotating support member 220 is arranged in one of the support member 210 and the seat connection part 130, and the rotating groove 131 is recessed in the other of the support member 210 and the seat connection part 130, and the seat connection part 130 rotates forward and backward relative to the support member 210 through the second pitch adjustment mechanism, thereby driving the chair back assembly 1 to be pitch-adjusted relative to the seat assembly 2.

[0040] In this embodiment, the rotation adjustment between the back bracket 120 and the seat assembly 2 is achieved by the rotation cooperation of the rotation groove 131 and the rotation support 220. The structure is simple, easy to assemble, and the rotation adjustment operation is simple; not only that, the support member 210 extends upward beyond the upper surface of the seat assembly 2, so that the rotation fulcrum between the back bracket 120 and the seat assembly 2 is located above the seat assembly 2, closer to the center of gravity of the human body when sitting on the seat, effectively avoiding the chair back 110 from rubbing the user's clothes during the pitch adjustment process, and providing a better user experience.

[0041] Please refer to the attached Figure 11-12The rotating support member 220 is an end cover structure, and a mounting hole 211 is provided at the upper end of the support member 210. The rotating support member 220 is plugged and fixed to the support member 210 through the mounting hole 211; and a first limiting portion 222 is protruded on the side wall of the rotating support member 220, and a limiting opening 212 is correspondingly recessed on the hole wall of the mounting hole 211. When the rotating support member 220 is plugged into the support member 210, the first limiting portion 222 is inserted into the limiting opening 212, so that the rotating support member 220 cannot rotate relative to the support member 210. The rotating support member 220 is installed by plugging, and the installation operation is relatively simple.

[0042] Among them, the first limit portion 222 is arranged on the side of the rotating support 220 close to the bayonet 140, and a plurality of bayonet holes 221 are arranged on the first limit portion 222. Preferably, the rotating support 220 has two bayonet holes 221, so that the chair back assembly 1 has two adjustable gears. And the angle between the two bayonet holes 221 and the axis of the rotating support 220 is 25°, so that the chair back 1 can be tilted backward 25°, switching from a sitting position to a lying position, thereby meeting the user's usage needs. Of course, in other embodiments of the present application, the number of bayonet holes 221 on the rotating support 220 can also be three, four, and so on.

[0043] Please refer to the attached Fig.13 The bottom of the rotating groove 131 is hollowed out to form two symmetrical limiting grooves 133. The seat connecting part 130 is also provided with a limiting member 240, which includes a vertical connecting part 242 and second limiting members 241 horizontally provided on the left and right sides of the connecting part 242. The connecting part 242 is attached to the side of the connecting part 242 away from the rotating support member 220. The side of the rotating support member 220 close to the limiting member 240 is recessed to form a plurality of clamping grooves 223. The second limiting member 241 passes through the limiting groove 133 and then clamps into the clamping groove 223. A connecting hole is provided on the connecting part 242, and a bolt is screwed into the connecting part 242, passes through the seat connecting part 120 and is screwed to the rotating support member 220. As a result, the seat connecting part 130 is clamped between the connecting part 242 and the rotating support member 220, thereby improving the connection strength between the two and making the adjustment operation of the seat connecting part 120 more stable.

[0044] Please refer to the attached Figure 9-10In some embodiments of the present application, the rotating support member 220 is arranged on the support member 210, and a rotating groove 131 is correspondingly recessed on the seat connection part 130. A gear adjustment mechanism is also arranged between the seat connection part 130 and the rotating support member 220. The gear adjustment mechanism includes a bayonet 140 that is engaged with each other and a plurality of bayonet holes 221 that are recessed along the circumferential direction on the side wall of the rotating support member 220. A first connecting groove 132 extending laterally is recessed on the seat connection part 130. The first connecting groove 132 is connected to the rotating groove 131, and an adjusting member 150 is slidably connected in the first connecting groove 132. The bayonet pin 140 is connected to the adjusting member 150. The adjusting member 150 is configured to drive the bayonet pin 140 to slide forward and backward along the first connecting groove 132 to insert or remove the bayonet pin 140 into or remove one of the plurality of bayonet holes 221.

[0045] In this embodiment, the gear adjustment is achieved by driving the adjusting member 150 on the seat connecting portion 130 to engage or disengage the bayonet 140 from the bayonet 221 on the rotating support member 220, so that the gear adjustment operation is relatively simple and convenient; and the bayonet 140 and the bayonet 221 are hidden in the first connecting groove 132 and the rotating groove 131, so that the appearance appears to be more concise and more beautiful.

[0046] Please refer to the attached Fig.12 The bottom of the first connecting groove 132 is recessed with a second connecting groove 141 extending transversely, and the bayonet 140 is slidably connected to the seat connecting portion 130 through the second connecting groove 141. A second spring 142 is provided at the rear side of the second connecting groove 141, one end of the second spring 142 acts on the groove wall of the second connecting groove 141, and the other end of the second spring 142 acts on the bayonet 140, so that the bayonet 140 always has a tendency to slide toward the rotating support member 220. Not only does the sliding operation of the bayonet 140 in the first connecting groove 141 become stable and smooth, but the bayonet 140 can also automatically snap into the bayonet 221 with the help of the reset elastic force to achieve gear locking, thereby making the gear adjustment operation easier.

[0047] Please refer to the attached Fig.12 In some embodiments of the present application, a first elastic reset structure is further provided between the rotating support 220 and the seat connection portion 130. The first elastic reset structure includes a torsion spring 230. One side arm of the torsion spring 230 acts on the seat connection portion 130, and the other side arm of the torsion spring 230 acts on the rotating support 220, so that the seat connection portion 130 always has a tendency to rotate forward relative to the rotating support 220. When the chair back 110 switches from a reclining position to a sitting position, the user does not need to manually straighten the chair back assembly 1. The user only needs to press the adjustment member 150, and the seat connection portion 130 can automatically rotate the chair back assembly 1 to the sitting position with the help of the reset elastic force. This makes the pitch adjustment operation of the chair back assembly 1 easier.

[0048] Please refer to the attached Figure 2-3 In some embodiments of the present application, the pitch adjustment angle of the chair back 110 relative to the back support 120 is 0-15°. By setting the third pitch adjustment mechanism, the chair back 110 can be further pitched relative to the back support 120, thereby further increasing the pitch adjustment angle of the chair back 110, making the user experience in the reclining state closer to lying flat, and more comfortable; and even in the sitting state, the inclination of the chair back 110 can be adjusted to make the chair back 110 fit the user's back better, and the user experience is more comfortable.

[0049] Therefore, with the help of the first pitch adjustment mechanism, the second pitch adjustment mechanism and the third pitch adjustment mechanism, the pitch adjustment angle of the seat back 110 relative to the support component 3 is 0-75°, that is, when the seat is in the reclining state, the maximum pitch angle of the seat back 110 is close to 165°, and the user experience is close to lying flat, with better comfort.

[0050] Please refer to the attached Figure 5 In some embodiments of the present application, the third pitch adjustment mechanism includes a seat back connector 111 disposed on the seat back 110 and a back support connector 121 disposed on the back support 120, and the seat back connector 111 is hinged to the back support connector 121, so that the seat back connector 111 can rotate forward and backward relative to the back support connector 121, thereby driving the seat back 110 to rotate forward and backward relative to the back support 120. The pitch adjustment of the seat back 110 is performed by the seat back connector 111 and the back support connector 121 that are hinged to each other, which has a simple structure and is relatively easy to operate.

[0051] Among them, the front end of the back support connecting member 121 is recessed with an installation groove 122, and the seat back connecting member 111 fits in the installation groove 122, so that the third pitch adjustment mechanism is relatively compact and not easily exposed between the seat back 110 and the back support 120; and the back support connecting member 121 and the seat back connecting member 111 are hinged by transversely arranged bolts, which not only meets the rotation adjustment between the two, but also makes the installation and disassembly between the two more convenient, thereby making the seat back 110 detachable on the back support 120, so that when packing and transporting, the seat can be disassembled into various components as a whole, effectively reducing the packaging volume and reducing the transportation cost.

[0052] Please refer to the attached Figure 6The back support connector 121 is detachably disposed on the back support 120. A clamping groove 123 is recessed on the back support 120, and the back support connector 121 is clamped to the back support 120 through the clamping groove 123. Moreover, the back support connector 121 and the back support 120 are fixed by screws, which not only makes the installation and disassembly between the two more convenient, but also makes the structure between the back support 120 and the back support connector 121 more compact and not easy to be exposed.

[0053] Please refer to the attached Figure 7 In some embodiments of the present application, a second elastic reset structure is further provided between the seat back connector 111 and the back support connector 121, and the second elastic reset structure includes a first spring 101, and the first spring 101 is provided in the mounting groove 122, and one end of the first spring 101 acts on the seat back connector 111, and the other end of the first spring 101 acts on the back support connector 121, so that the seat back connector 111 always has a tendency to rotate forward relative to the back support connector 121.

[0054] In this embodiment, by providing the first spring 101, when the user does not need to use the seat, the chair back 110 will automatically return to its initial state with the help of the elastic force of the first spring 101, and there is no need to manually straighten the chair back 110, thereby making the pitch adjustment operation of the chair back assembly 1 easier; and, when the user leans against the chair back 110, the chair back 110 can not only provide the user with comfortable elastic support with the help of the elastic force of the first spring 101, but also can automatically rotate to an angle that fits the user's back after being compressed, making the user experience more convenient and comfortable.

[0055] The first spring 101 is arranged in the installation groove 122, so that the first spring 101 is not easily exposed, and the connection between the first spring 101 and the seat back connectors 111 on both sides and the back support connector 121 is more stable and not easy to fall off.

[0056] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means more than three.

[0057] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A seat with large pitch adjustment angle, characterized in that: The invention comprises a chair back assembly (1), a seat assembly (2) and a support assembly (3); a first pitch adjustment mechanism is arranged between the seat assembly (2) and the support assembly (3); the first pitch adjustment mechanism comprises a tray (4); the tray (4) is configured to connect the seat assembly (2) and the support assembly (3) and enable the seat assembly (2) to rotate up and down relative to the support assembly (3); the chair back assembly (1) comprises a chair back (110) supported by a back support (120) at the rear side of the chair back (110); a first pitch adjustment mechanism is arranged between the back support (120) and the chair seat assembly (2); The invention further comprises a second pitch adjustment mechanism, wherein the second pitch adjustment mechanism is configured to enable the back support (120) to be rotated forward and backward relative to the seat assembly (2); a third pitch adjustment mechanism is provided between the seat back (110) and the back support (120), wherein the third pitch adjustment mechanism is configured to enable the seat back (110) to be rotated forward and backward relative to the back support (120); thereby, when the seat back assembly (1) and the seat assembly (2) are rotated backward, a large angle of backward tilt is achieved by superimposing the rotation angles of the first pitch adjustment mechanism, the second pitch adjustment mechanism and the third pitch adjustment mechanism.

2. The seat with large pitch adjustment angle according to claim 1, characterized in that: The pitch adjustment angle of the seat assembly (2) relative to the support assembly (3) is 0-30°.

3. The seat with large pitch adjustment angle according to claim 1, characterized in that: The tray (4) comprises a seat connection plate (410) connected to the bottom of the seat assembly (2) and a rotating support plate (420) connected to the top of the support assembly (3); the seat connection plate (410) is hinged to the rotating support plate (420).

4. The seat with large pitch angle adjustment according to claim 1, characterized in that: The pitch adjustment angle of the chair back assembly (1) relative to the chair seat assembly (2) is 0-30°.

5. The seat with large pitch adjustment angle according to claim 1, characterized in that: The left and right sides of the back support (120) extend forward to form a seat connection part (130), and the left and right sides of the seat assembly (2) are connected to support members (210), and the support members (210) extend upward beyond the upper surface of the seat assembly (2); the second pitch adjustment mechanism comprises a columnar rotating support member (220) and a rotating groove (131) that are rotatably matched with each other, the rotating support member (220) being arranged on one of the support member (210) and the seat connection part (130), and the rotating groove (131) being recessed and arranged on the other of the support member (210) and the seat connection part (130); the seat connection part (130) is rotated forward and backward relative to the support member (210) through the second pitch adjustment mechanism, thereby driving the chair back assembly (1) to be pitch-adjustable relative to the seat assembly (2).

6. The seat with large pitch angle adjustment according to claim 5, characterized in that: The rotating support member (220) is arranged on the supporting member (210), the rotating groove (131) is correspondingly recessed on the seat connecting portion (130), and a gear adjustment mechanism is also arranged between the seat connecting portion (130) and the rotating support member (220), the gear adjustment mechanism comprising a bayonet pin (140) that is engaged with each other and a plurality of bayonet holes (221) that are recessed along the circumferential direction on the side wall of the rotating support member (220), the seat connecting portion (130) being recessed on the seat connecting portion (130). The recess is provided with a first connecting groove (132) extending transversely, the first connecting groove (132) is connected to the rotating groove (131), and an adjusting member (150) is slidably connected in the first connecting groove (132), the bayonet (140) is connected to the adjusting member (150), and the adjusting member (150) is configured to drive the bayonet (140) to slide forward and backward along the first connecting groove (132) so as to insert or remove the bayonet (140) from one of the plurality of bayonet holes (221).

7. The seat with large pitch adjustment angle according to claim 5, characterized in that: A first elastic reset structure is also provided between the rotating support member (220) and the seat connection portion (130), the first elastic reset structure comprising a torsion spring (230), one side force arm of the torsion spring (230) acting on the seat connection portion (130), and the other side force arm of the torsion spring (230) acting on the rotating support member (220), so that the seat connection portion (130) always has a tendency to rotate forward relative to the rotating support member (220).

8. The seat with large pitch adjustment angle according to claim 1, characterized in that: The pitch adjustment angle of the chair back (110) relative to the back support (120) is 0-15°.

9. The seat with large pitch angle adjustment according to claim 1, characterized in that: The third pitch adjustment mechanism comprises a seat back connector (111) arranged on the seat back (110) and a back support connector (121) arranged on the back support (120), and the seat back connector (111) is hinged to the back support connector (121), so that the seat back connector (111) can rotate forward and backward relative to the back support connector (121), thereby driving the seat back (110) to rotate forward and backward relative to the back support (120).

10. The seat with large pitch angle adjustment according to claim 9, characterized in that: A second elastic reset structure is also provided between the seat back connector (111) and the back support connector (121), the second elastic reset structure comprising a first spring (101), one end of the first spring (101) acting on the seat back connector (111), and the other end of the first spring (101) acting on the back support connector (121), so that the seat back connector (111) always has a tendency to rotate forward relative to the back support connector (121).

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