Chair back rotation adjusting mechanism

Abstract

The chair back rotation adjusting mechanism comprises a chair back and a chair seat, the chair back comprises a back support supported on the rear side of the chair back, the left side and the right side of the back support extend forwards to form rotating parts, the left side and the right side of the chair seat are connected with chair back connecting pieces, and columnar rotating grooves are formed in the front sides of the rotating parts in a sunken mode; a columnar rotating supporting piece is arranged on the chair back connecting piece, and the rotating part is rotationally connected to the rotating supporting piece through the rotating groove; a gear adjusting mechanism is further arranged between the rotating part and the rotating supporting piece, the gear adjusting mechanism comprises a locking piece and a plurality of lock holes formed in the side wall of the rotating supporting piece in a sunken mode, a first sliding groove extending transversely is formed in the rotating part in a sunken mode, the first sliding groove communicates with the rotating groove, and an adjusting switch is slidably connected into the first sliding groove; the locking piece is connected to the adjusting switch. According to the chair back rotation adjusting mechanism provided by the invention, the rotation adjusting mechanism is simple and compact in structure, more concise in appearance, better in aesthetic property and simpler and more convenient to assemble and operate.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a seat back rotation adjustment mechanism. 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, a reclining chair on the current market has a tray at the bottom of the seat, the lower end of the chair back is rotatably connected to the tray, and the functions of lying down the chair back and adjusting the inclination angle of the chair back are achieved through positioning pins, positioning holes and torsion springs in the tray. However, for the chair back that rotates through the tray, the rotation point of the chair back is located below the center of gravity of the user; the distance between the backrest and the seat board will increase during the lying process, causing the clothes to be rubbed up, resulting in a poor user experience.

[0003] In order to solve the above problems, the utility patent previously applied by the applicant with patent number: 202223394438.1 provides a rotating structure of the backrest armrest of a reclining chair, which is achieved by rotating the lower part of the backrest component and the lower part of the armrest component; and an angle adjustment mechanism is provided above the rotating connection between the armrest component and the backrest component; the angle adjustment mechanism includes a guide sleeve arranged on the armrest component, an arc-shaped guide seat correspondingly arranged on the backrest component, and a locking control component; the guide seat is slidably plugged into the guide sleeve, and the backrest component rotates relative to the armrest component to make the guide seat slide relative to the guide sleeve; the locking control component includes an adjustment switch exposed outside the guide sleeve, and the adjustment switch can be used to adjust the guide seat to slide relative to the guide sleeve to lock and unlock. This rotating structure is not only simple in structure and easy to adjust, but also the rotation point of the backrest component and the armrest component is closer to the center of gravity of the human body sitting on the seat, which can further eliminate the feeling of rubbing the back.

[0004] However, the above scheme has the following problems: the connection structure between the chair back component and the armrest component includes, in addition to the rotation limit structure connection on the lower side, an angle adjustment mechanism on the upper side, which makes the connection structure between the chair back component and the armrest component more complicated, and appears bulky and not streamlined in appearance; and during installation, the rotation limit structure and the angle adjustment mechanism on the upper and lower sides of the chair back component and the armrest component need to be connected and assembled, which also makes the assembly operation of the seat more complicated. Summary of the invention

[0005] In view of the above defects or deficiencies in the prior art, it is desirable to provide a seat back rotation adjustment mechanism. The seat back and the seat are rotationally connected only through the rotation groove on the rotating part and the rotation support on the seat back connector, and the gear adjustment mechanism is arranged between the rotating part and the rotation support, so that the rotation adjustment mechanism has a simple and compact structure, and is more concise and more beautiful in appearance; and when the seat back is installed on the seat, the assembly can be completed by simply connecting the rotation support on the seat back connector to the rotation groove on the rotating part, so that the assembly operation of the entire seat is relatively simple.

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

[0007] The present application provides a chair back rotation adjustment mechanism, comprising a chair back and a seat, the chair back comprising a back bracket supported on the rear side of the chair back, the left and right sides of the back bracket extending forward to form a rotating part, the left and right sides of the seat being connected to a chair back connecting piece, the chair back connecting piece extending upwardly beyond the upper surface of the seat, a columnar rotating groove being recessed on the front side of the rotating part, a columnar rotating support piece being correspondingly disposed on the chair back connecting piece, the rotating part rotating along the circumferential direction of the rotating support piece through the rotating groove, thereby driving the chair back to rotate forward and backward relative to the seat; a gear adjustment mechanism is also disposed between the rotating part and the rotating support piece, the gear adjustment mechanism comprising a locking piece that is engaged with each other and a plurality of locking holes recessed along the circumferential direction on the side wall of the rotating support piece, a first sliding groove extending transversely being recessed on the rotating part, the first sliding groove being connected to the rotating groove, and an adjustment switch being slidably connected in the first sliding groove, the locking piece being connected to the adjustment switch, and the adjustment switch being configured to drive the locking piece to slide forward and backward along the first sliding groove so as to insert or remove the locking piece into or out of one of the plurality of locking holes.

[0008] Furthermore, a mounting hole is provided at the upper end of the backrest connector, and the rotating support is plugged and fixed to the backrest connector through the mounting hole; and a first limiting portion is protruding from the side wall of the rotating support, and a corresponding limiting opening is recessed on the hole wall of the mounting hole. When the rotating support is plugged into the backrest connector, the first limiting portion is inserted into the limiting opening, so that the rotating support cannot rotate relative to the backrest connector. The backrest connector and the rotating support are connected by plugging, so that the installation and disassembly operation of the rotating support is relatively simple; and the rotating support and the backrest connector are positioned by the first limiting portion and the limiting opening, so as to ensure the connection stability between the rotating support and the backrest connector.

[0009] Furthermore, the first limit portion is arranged on one side of the rotating support member close to the locking member, and a plurality of lock holes are arranged on the first limit portion. By arranging the lock holes on the protruding first limit portion, the locking member can be more easily inserted into or removed from the lock holes, thereby making the gear adjustment operation smoother.

[0010] Furthermore, a limiting assembly is provided between the rotating support and the rotating part, and the limiting assembly includes a rod-mounted second limiting part and an arc-shaped limiting groove, the limiting groove is provided in one of the rotating groove and the rotating support, and the second limiting part is provided in the other of the rotating groove and the rotating support; when the rotating part rotates relative to the rotating support, the second limiting part slides in the limiting groove, thereby limiting the rotation angle of the rotating part, so that the rotation adjustment operation of the rotating part is smoother, and the locking part cannot be inserted into the lock hole to achieve fixation due to the rotating angle of the rotating part being too large.

[0011] Furthermore, the bottom of the rotating groove is hollowed out to be provided with a plurality of limit grooves, and a limit piece is also provided on the rotating part, the limit piece includes a vertical connecting part and a plurality of second limit pieces horizontally provided on the connecting part, the connecting part is attached to a side of the connecting part away from the rotating support, and the second limit piece passes through the limit groove and is connected to the rotating support, so that the rotating part is clamped between the connecting part and the rotating support, the connection strength between the two is improved, and the adjustment operation of the rotating part is smoother.

[0012] Furthermore, a return torsion spring is also arranged in the rotation groove, and one side force arm of the return torsion spring acts on the rotation part, and the other side force arm of the return torsion spring acts on the rotation support, so that the rotation part always has a tendency to rotate forward relative to the rotation support. When the chair back is rotated backward, the return torsion provides a return elastic force for the rotation part, thereby making the rotation adjustment operation of the chair back easier.

[0013] Furthermore, the bottom of the first sliding groove is recessed with a second sliding groove extending transversely, and the locking member is slidably connected to the rotating part through the second sliding groove, thereby improving the connection strength between the locking member and the rotating part and ensuring that the sliding operation of the locking member in the first sliding groove is stable and smooth.

[0014] Furthermore, a return spring is provided at the rear side of the second sliding groove, one end of the return spring acts on the groove wall of the second sliding groove, and the other end of the return spring acts on the locking member, so that the locking member always has a tendency to slide toward the rotating support member. The locking member can be stably inserted into the lock hole with the help of the elastic force of the return spring, thereby improving the connection strength between the locking member and the rotating support member. Moreover, the locking member can automatically insert into the lock hole with the help of the return elastic force to achieve gear locking, thereby making the gear adjustment operation easier.

[0015] Furthermore, the adjustment switch and the locking member are connected via a clamping assembly, which includes a clamp head and a clamping port, wherein the clamp head is provided at one of the adjustment switch and the locking member, and the clamping port is provided at the other of the adjustment switch and the locking member. By providing the clamping assembly, the structure is simple and the adjustment switch and the locking member can be relatively fixed in the front-to-back direction, and the locking member can be driven to slide forward and backward to be clamped into or pulled out of the lock hole by simply moving the adjustment switch forward and backward.

[0016] Furthermore, a plurality of third limit parts are protruded from one side of the adjustment switch close to the rotating part, and a plurality of third sliding grooves are correspondingly hollowed out at the bottom of the first sliding groove, and the third limit part passes through the third sliding groove and can slide forward and backward along the third sliding groove, and a stop block is also provided at one end of the third limit part away from the adjustment switch, and the width of the stop block is greater than the third sliding groove, so that the adjustment switch and the rotating part remain relatively fixed in the left and right directions. The connection strength between the adjustment switch and the rotating part is improved to prevent the adjustment switch from being separated from the first sliding groove during use.

[0017] Furthermore, a shielding groove is recessed on one side of the rotating part away from the first sliding groove, the shielding groove is connected to the third sliding groove and the stop block is arranged on the shielding groove, and a cover plate is detachably arranged on the shielding groove, and the cover plate is configured to shield the third sliding groove and the stop block. The gear adjustment mechanism is hidden inside the rotating part, the appearance of the rotating part is neater, and the aesthetics of the seat is improved.

[0018] Furthermore, the rotating part is detachably connected to an armrest, the upper end of the rotating part extends upward to form an armrest connecting part, the bottom of the armrest is recessed with a plug-in slot, and the armrest is plugged and fixed to the armrest connecting part through the plug-in slot. When the chair back is rotated and adjusted, the armrest can rotate with the chair back and provide stable support for the user's arm. In addition, the armrest is detachably arranged on the rotating part through the plug-in slot, which not only makes the installation and disassembly of the armrest relatively simple, but also makes it convenient for merchants to replace armrests with different functions and shapes according to the preferences of consumers.

[0019] The chair back rotation adjustment mechanism provided by the present application realizes a rotation connection between the chair back and the seat only through a rotation groove on the rotating part and a rotation support member on the chair back connecting member, and the gear adjustment is realized by driving the locking member to be engaged in or pulled out of the lock hole on the rotation support member through the adjustment switch on the rotating part, so that the rotation adjustment mechanism has a simple and compact structure and appears simpler and more beautiful in appearance; and when installing the chair back to the seat, the assembly can be completed by simply connecting the rotation support member on the chair back connecting member to the rotation groove on the rotating part, so that the overall assembly operation of the seat is relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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:

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a seat provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the side structure of a seat in a sitting position provided in an embodiment of the present application;

[0023] Figure 3A schematic diagram of the side structure of a seat in a supine position provided by an embodiment of the present application;

[0024] Figure 4 A schematic cross-sectional structure diagram of a rotating portion and a rotating support member in a locked state provided in an embodiment of the present application;

[0025] Figure 5 A schematic cross-sectional structure diagram of a rotating portion and a rotating support member in an active state provided by an embodiment of the present application;

[0026] Figure 6 A schematic diagram of the connection structure between the chair back connector and the rotating part provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of the connection structure between the chair back connector and the rotating support member provided in an embodiment of the present application;

[0028] Figure 8 A schematic diagram of the connection structure between the regulating switch and the rotating part provided in an embodiment of the present application;

[0029] Fig. 9 A schematic diagram of the connection structure between the cover plate and the rotating part provided in an embodiment of the present application;

[0030] Fig.10 A schematic diagram of the connection structure between the stopper and the rotating part provided in an embodiment of the present application;

[0031] Fig.11 A schematic diagram of the connection structure between the armrest and the rotating part provided in an embodiment of the present application.

[0032] The figures are marked as follows: 1-backrest, 110-back bracket, 111-first sliding groove, 112-second sliding groove, 113-reset spring, 114-third sliding groove, 115-blocking groove, 116-cover plate, 120-rotating part, 121-rotating groove, 122-limiting groove, 123-armrest connecting part, 130-locking piece, 131-bayonet, 140-adjusting switch, 141-clamp, 142-third limiting part, 143-stop block, 2-seat, 210-backrest connecting part, 211-mounting hole, 212-limiting mouth, 220-rotating support part, 221-locking hole, 222-first limiting part, 223-slot, 230-limiting piece, 231-second limiting part, 232-connecting part, 240-reset torsion spring, 3-armrest, 301-plug slot. 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 1-11 The embodiment of the present application provides a chair back rotation adjustment mechanism, including a chair back 1 and a seat 2, the chair back 1 includes a back support 110 supported on the rear side of the chair back 1, the left and right sides of the back support 110 extend forward to form a rotating portion 120, the left and right sides of the seat 2 are connected with a chair back connector 210, the chair back connector 210 extends upward beyond the upper surface of the seat 2, the front side of the rotating portion 120 is recessed with a columnar rotating groove 121, and the chair back connector 210 is correspondingly provided with a columnar rotating support 220, the rotating portion 120 rotates along the circumference of the rotating support 220 through the rotating groove 121, thereby driving the chair back 1 to rotate forward and backward relative to the seat 2; the rotating portion 120 is rotated along the circumference of the rotating support 220 ... A gear adjustment mechanism is also provided between the part 120 and the rotating support member 220, and the gear adjustment mechanism includes a locking member 130 that are engaged with each other and a plurality of lock holes 221 that are recessed along the circumferential direction on the side wall of the rotating support member 220. A first sliding groove 111 extending laterally is recessed on the rotating part 120, the first sliding groove 111 is connected to the rotating groove 121, and an adjustment switch 140 is slidably connected in the first sliding groove 111, the locking member 130 is connected to the adjustment switch 140, and the adjustment switch 140 is configured to drive the locking member 130 to slide back and forth along the first sliding groove 111 to insert or remove the locking member 130 into or out of one of the plurality of lock holes 221.

[0035] In this embodiment, the chair back 1 and the seat 2 are rotatably connected only by the rotation groove 121 on the rotating part 120 and the rotation support 220 on the chair back connecting part 210, and the gear adjustment is achieved by driving the locking member 130 to snap into or out of the lock hole 221 on the rotation support 220 through the adjustment switch 140 on the rotating part 120, so that the rotation adjustment mechanism has a simple and compact structure, and appears simpler and more beautiful in appearance; and when installing the chair back 1 to the seat 2, the assembly can be completed by simply docking the rotation support 220 on the chair back connecting part 210 with the rotation groove 121 on the rotating part 120, so that the overall assembly operation of the seat is relatively simple.

[0036] Preferably, the rotating support 220 has two locking holes 221, so that the chair back 1 has two adjustable gears. And the angle between the two locking holes 221 and the axis of the rotating support 220 is 25°, so that the chair back 1 can be tilted back 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 locking holes 221 on the rotating support 220 can also be three, four, etc.

[0037] Please refer to the attached Figure 7 In some embodiments of the present application, a mounting hole 211 is provided at the upper end of the seat back connector 210, and the rotating support member 220 is plugged and fixed to the seat back connector 210 through the mounting hole 211; and a first limiting portion 222 is protruding from 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 seat back connector 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 seat back connector 210.

[0038] In this embodiment, the seat back connector 210 and the rotating support member 220 are connected by plugging, so that the installation and disassembly operations of the rotating support member 220 are relatively simple; and the rotating support member 220 and the seat back connector 210 are positioned by the first limiting portion 222 and the limiting opening 212 to ensure the connection stability between the rotating support member 220 and the seat back connector 210, thereby preventing the rotating support member 220 and the rotating portion 120 from rotating together during the rotation adjustment of the seat back 1, resulting in the seat back 1 being unable to be fixed.

[0039] Please refer to the attached Figure 6 In some embodiments of the present application, the first limiting portion 222 is disposed on a side of the rotation support member 220 close to the locking member 130 , and a plurality of locking holes 221 are disposed on the first limiting portion 222 .

[0040] In this embodiment, by arranging the locking hole 221 on the protruding first limiting portion 222 , the locking member 130 can be more easily inserted into or removed from the locking hole 221 , thereby making the gear adjustment operation smoother.

[0041] Please refer to the attached Figure 6In some embodiments of the present application, a limiting assembly is provided between the rotating support 220 and the rotating part 120, and the limiting assembly includes a rod-mounted second limiting portion 231 and an arc-shaped limiting groove 122, wherein the limiting groove 122 is provided in one of the rotating groove 121 and the rotating support 220, and the second limiting portion 231 is provided in the other of the rotating groove 121 and the rotating support 220; when the rotating part 120 rotates relative to the rotating support 220, the second limiting portion 231 slides in the limiting groove 122, thereby limiting the rotation angle of the rotating part 120. This makes the rotation adjustment operation of the rotating part 120 smoother, and avoids the inability of the locking member 130 to be inserted into the lock hole 221 for fixation due to the rotating angle of the rotating part 120 being too large.

[0042] Please refer to the attached Fig.10 In some embodiments of the present application, the bottom of the rotating groove 121 is hollowed out to provide a plurality of limit grooves 122, and a limit member 230 is also provided on the rotating portion 120. The limit member 230 includes a vertical connecting portion 232 and a plurality of second limit portions 231 horizontally arranged on the connecting portion 232. The connecting portion 232 is attached to a side of the connecting portion 232 away from the rotating support member 220, and the second limit portion 231 passes through the limit groove 122 and is connected to the rotating support member 220.

[0043] In this embodiment, the second limiting portion 231 of the limiting member 230 passes through the rotating portion 120 and is connected to the rotating support member 220, so that the rotating portion 120 is clamped between the connecting portion 232 and the rotating support member 220, thereby improving the connection strength between the two and making the adjustment operation of the rotating portion 120 smoother.

[0044] Among them, preferably, the rotating support member 220 is an end cover structure, and a plurality of slots 223 are recessed on one side of the rotating support member 220 close to the limiting member 230. The second limiting portion 231 passes through the limiting slot 122 and is inserted into the slot 223, thereby improving the connection strength between the rotating support member 220 and the limiting member 230.

[0045] Among them, the limit member 230 and the rotating support member 220 are fixed by screw connection. A connecting hole is opened on the connecting part 232. The bolt is screwed into the connecting part 232, passes through the rotating part 120 and is screwed to the rotating support member 220, thereby further improving the connection strength between the rotating support member 220 and the limit member 230, and ensuring that the rotating part 120 and then the rotating support member 220 are relatively fixed in the left and right directions, so that the rotation adjustment operation of the rotating part 120 is smoother.

[0046] Preferably, the second limiting parts 231 are symmetrically arranged on the left and right sides of the limiting member 230, and two symmetrical limiting grooves 122 are correspondingly opened on the rotating groove 121, so that the rotating operation of the rotating part 120 is more stable. Of course, in other embodiments of the present application, the number of the second limiting parts 231 on the limiting member 230 can also be one, three, four, etc.

[0047] Please refer to the attached Figure 6 In some embodiments of the present application, a return torsion spring 240 is also provided in the rotating groove 121, and a force arm on one side of the return torsion spring 240 acts on the rotating part 120, and a force arm on the other side of the return torsion spring 240 acts on the rotating support 220, so that the rotating part 120 always has a tendency to rotate forward relative to the rotating support 220.

[0048] In this embodiment, by providing a reset torsion spring 240, when the chair back 1 is rotated backward for adjustment, the reset torsion spring 240 provides a reset elastic force for the rotating part 120. When the chair back 1 is switched from a reclining state to a sitting state, the user does not need to manually straighten the chair back 1. The user only needs to press the adjustment switch 140, and the rotating part 120 can automatically rotate the chair back 1 to the sitting state with the help of the reset elastic force. This makes the rotation adjustment operation of the chair back 1 easier.

[0049] Please refer to the attached Figure 8 In some embodiments of the present application, the bottom of the first sliding groove 111 is recessed to form a transversely extending second sliding groove 112, and the locking member 130 is slidably connected to the rotating portion 120 through the second sliding groove 112. The connection strength between the locking member 130 and the rotating portion 120 is improved to ensure that the sliding operation of the locking member 130 in the first sliding groove 111 is stable and smooth.

[0050] Please refer to the attached Figure 4-5 In some embodiments of the present application, a return spring 113 is provided on the rear side of the second sliding groove 112, one end of the return spring 113 acts on the groove wall of the second sliding groove 112, and the other end of the return spring 113 acts on the locking member 130, so that the locking member 130 always has a tendency to slide toward the rotating support member 220.

[0051] In this embodiment, by providing the return spring 113, the locking member 130 can be stably inserted into the lock hole 221 by means of the elastic force of the return spring 113, thereby improving the connection strength between the locking member 130 and the rotating support member 220. In addition, when the user moves the adjustment switch 140 backward to perform the rotation adjustment operation of the chair back 1, the return spring 113 provides the return elastic force for the locking member 130; after the user has completed the adjustment, the locking member 130 can automatically be inserted into the lock hole 221 by means of the return elastic force to achieve gear locking, thereby making the gear adjustment operation easier.

[0052] Please refer to the attached Figure 4-5 In some embodiments of the present application, the adjustment switch 140 and the locking member 130 are connected by a snap-fit ​​assembly, which includes a snap head 141 and a snap socket 131. The snap head 141 is provided at one of the adjustment switch 140 and the locking member 130, and the snap socket 131 is provided at the other of the adjustment switch 140 and the locking member 130. By providing the snap-fit ​​assembly, the structure is simple and the adjustment switch 140 and the locking member 130 can be relatively fixed in the front-to-back direction. The locking member 130 can be driven to slide forward and backward to be inserted into or removed from the lock hole 221 by simply moving the adjustment switch 140 forward and backward.

[0053] Preferably, the clamping head 141 is disposed on the regulating switch 140 , and the locking member 130 is correspondingly provided with a clamping opening 131 .

[0054] Please refer to the attached Figure 8-9 In some embodiments of the present application, a plurality of third limiting portions 142 are provided protruding from one side of the regulating switch 140 close to the rotating portion 120, and a plurality of third sliding grooves 114 are provided correspondingly to the hollow bottom of the first sliding groove 111. The third limiting portion 142 passes through the third sliding groove 114 and can slide forward and backward along the third sliding groove 114. A stopper block 143 is also provided at one end of the third limiting portion 142 away from the regulating switch 140. The width of the stopper block 143 is greater than the third sliding groove 114, so that the regulating switch 140 and the rotating portion 120 remain relatively fixed in the left and right directions. The connection strength between the regulating switch 140 and the rotating portion 120 is improved to prevent the regulating switch 140 from being separated from the first sliding groove 111 during use.

[0055] Preferably, the stop block 143 is fixed to the third limiting portion 142 by screw connection, so that the installation and disassembly operations of the stop block 143 are more convenient.

[0056] Among them, preferably, two third limiting portions 142 which are symmetrical in upper and lower directions are provided on the adjustment switch 140, and two third sliding grooves 114 which are symmetrical in upper and lower directions are correspondingly opened on the first sliding groove 111, so that the sliding of the adjustment switch 140 is constrained by the third limiting portions 142 on the upper and lower sides, thereby making the sliding process of the adjustment switch 140 smoother.

[0057] Please refer to the attached Fig. 9 In some embodiments of the present application, a shielding groove 115 is recessed on one side of the rotating part 120 away from the first sliding groove 111, the shielding groove 115 is connected to the third sliding groove 114 and the stopper 143 is arranged on the shielding groove 115, and a cover plate 116 is detachably arranged on the shielding groove 115, and the cover plate 116 is configured to shield the third sliding groove 114 and the stopper 143. The gear adjustment mechanism is hidden inside the rotating part 120, and the appearance of the rotating part 120 is neater, which improves the aesthetics of the seat.

[0058] Preferably, the cover plate 116 is connected to the rotating part 120 via a snap-fit ​​structure, so that the installation and removal operations of the cover plate 116 are relatively simple.

[0059] Please refer to the attached Fig.11 In some embodiments of the present application, the rotating portion 120 is detachably connected to the armrest 3, the upper end of the rotating portion 120 extends upward to form an armrest connecting portion 123, the bottom of the armrest 3 is recessed to form a plug-in slot 301, and the armrest 3 is plugged and fixed to the armrest connecting portion 123 through the plug-in slot 301

[0060] In this embodiment, the armrest 3 is connected to the rotating part 120, so that when the chair back 1 is rotated and adjusted, the armrest 3 can rotate together with the chair back 1, so that no matter how much the chair back 1 rotates, the armrest 3 is always located on the left and right sides of the back support 110 and provides stable support for the user's arms. In addition, the armrest 3 is detachably arranged on the rotating part 120 through the plug slot 301, which not only makes the installation and removal of the armrest 3 relatively simple, but also makes it convenient for merchants to replace the armrest 3 with different functions and forms according to the preferences of consumers.

[0061] 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.

[0062] 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 back rotation adjustment mechanism, characterized in that: The invention comprises a chair back (1) and a chair seat (2), wherein the chair back (1) comprises a back support (110) supported on the rear side of the chair back (1), the left and right sides of the back support (110) extend forward to form a rotating part (120), the left and right sides of the chair seat (2) are connected with a chair back connecting piece (210), the chair back connecting piece (210) extends upward beyond the upper surface of the chair seat (2), a columnar rotating groove (121) is recessed on the front side of the rotating part (120), a columnar rotating support piece (220) is correspondingly provided on the chair back connecting piece (210), the rotating part (120) rotates along the circumference of the rotating support piece (220) through the rotating groove (121), thereby driving the chair back (1) to rotate forward and backward relative to the chair seat (2); the rotating part (120) and the rotating support piece (220) are connected to the back support piece (110) and the rotating support piece (220) to form a rotating part (120) and a rotating part (1 ... A gear adjustment mechanism is also provided between the rotating support members (220), the gear adjustment mechanism comprising a locking member (130) engaging with each other and a plurality of lock holes (221) recessed along the circumferential direction on the side wall of the rotating support member (220); a first sliding groove (111) extending transversely is recessed on the rotating portion (120); the first sliding groove (111) is connected to the rotating groove (121), and an adjustment switch (140) is slidably connected in the first sliding groove (111); the locking member (130) is connected to the adjustment switch (140), and the adjustment switch (140) is configured to drive the locking member (130) to slide forward and backward along the first sliding groove (111) so as to insert or remove the locking member (130) from one of the plurality of lock holes (221).

2. The seat back rotation adjustment mechanism according to claim 1, characterized in that: A mounting hole (211) is provided at the upper end of the seat back connecting member (210), and the rotating support member (220) is plugged and fixed to the seat back connecting member (210) through the mounting hole (211); and a first limiting portion (222) is protrudingly provided 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 seat back connecting 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 seat back connecting member (210).

3. The seat back rotation adjustment mechanism according to claim 2, characterized in that: The first limiting portion (222) is arranged on a side of the rotating support component (220) close to the locking component (130), and the plurality of locking holes (221) are arranged on the first limiting portion (222).

4. The seat back rotation adjustment mechanism according to claim 1, characterized in that: A limiting assembly is also provided between the rotating support member (220) and the rotating part (120), the limiting assembly comprising a rod-mounted second limiting portion (231) and an arc-shaped limiting groove (122), the limiting groove (122) being provided in one of the rotating groove (121) and the rotating support member (220), and the second limiting portion (231) being provided in the other of the rotating groove (121) and the rotating support member (220); when the rotating part (120) rotates relative to the rotating support member (220), the second limiting portion (231) slides in the limiting groove (122), thereby limiting the rotation angle of the rotating part (120).

5. The seat back rotation adjustment mechanism according to claim 4, characterized in that: The bottom of the rotating groove (121) is hollowed out to form a plurality of the limiting grooves (122); a limiting member (230) is also provided on the rotating portion (120); the limiting member (230) comprises a vertical connecting portion (232) and a plurality of second limiting portions (231) horizontally arranged on the connecting portion (232); the connecting portion (232) is attached to a side of the connecting portion (232) away from the rotating support member (220); and the second limiting portion (231) passes through the limiting groove (122) and is connected to the rotating support member (220).

6. The seat back rotation adjustment mechanism according to claim 1, characterized in that: A return torsion spring (240) is also provided in the rotation groove (121), and a force arm on one side of the return torsion spring (240) acts on the rotation part (120), and a force arm on the other side of the return torsion spring (240) acts on the rotation support member (220), so that the rotation part (120) always has a tendency to rotate forward relative to the rotation support member (220).

7. The seat back rotation adjustment mechanism according to claim 1, characterized in that: The groove bottom of the first sliding groove (111) is recessed to form a transversely extending second sliding groove (112), and the locking member (130) is slidably connected to the rotating portion (120) via the second sliding groove (112).

8. The seat back rotation adjustment mechanism according to claim 7, characterized in that: A return spring (113) is arranged on the rear side of the second sliding groove (112), one end of the return spring (113) acts on the groove wall of the second sliding groove (112), and the other end of the return spring (113) acts on the locking member (130), so that the locking member (130) always has a tendency to slide toward the rotating support member (220).

9. The seat back rotation adjustment mechanism according to claim 1, characterized in that: The regulating switch (140) and the locking member (130) are connected via a clamping assembly, wherein the clamping assembly comprises a clamp head (141) and a clamp socket (131), wherein the clamp head (141) is arranged on one of the regulating switch (140) and the locking member (130), and the clamp socket (131) is arranged on the other of the regulating switch (140) and the locking member (130).

10. The seat back rotation adjustment mechanism according to claim 1, characterized in that: A plurality of third limiting portions (142) are protrudingly provided on one side of the regulating switch (140) close to the rotating portion (120); a plurality of third sliding grooves (114) are correspondingly hollowed out at the bottom of the first sliding groove (111); the third limiting portion (142) passes through the third sliding groove (114) and can slide forward and backward along the third sliding groove (114); a stop block (143) is further provided at one end of the third limiting portion (142) away from the regulating switch (140); the width of the stop block (143) is greater than that of the third sliding groove (114), so that the regulating switch (140) and the rotating portion (120) remain relatively fixed in the left-right direction.

11. The seat back rotation adjustment mechanism according to claim 10, characterized in that: A shielding groove (115) is recessed on one side of the rotating portion (120) away from the first sliding groove (111); the shielding groove (115) is connected to the third sliding groove (114) and the stop block (143) is arranged in the shielding groove (115); a cover plate (116) is detachably arranged on the shielding groove (115); the cover plate (116) is configured to shield the third sliding groove (114) and the stop block (143).

12. The seat back rotation adjustment mechanism according to claim 1, characterized in that: The rotating portion (120) is detachably connected to an armrest (3); the upper end of the rotating portion (120) extends upward to form an armrest connecting portion (123); a plug-in slot (301) is provided in a recessed bottom of the armrest (3); and the armrest (3) is plugged and fixed to the armrest connecting portion (123) via the plug-in slot (301).

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