Seat with chair back turnover adjusting mechanism

Abstract

The utility model discloses a seat with a chair back turning adjusting mechanism, comprising: a chair back assembly comprising a chair back body and chair back connecting parts symmetrically arranged on the left and right sides of the chair back body; the chair seat assembly comprises a chair seat body and supporting frames symmetrically arranged on the left side and the right side of the chair seat body; the two chair back connecting parts are hinged to the supporting frames on the left side and the right side respectively, and then the chair back body can be driven to overturn front and back relative to the chair seat body; the locking structure comprises a locking pin and a locking hole which are matched in a clamping manner, the locking pin is movably arranged on one of the chair back connecting part and the supporting frame, and the locking hole is formed in the other one of the chair back connecting part and the supporting frame; a guide groove is concavely formed in the chair back connecting part or the supporting frame provided with the locking hole along the rotating track of the locking pin, one side of the guide groove is communicated with the locking hole, the other side of the guide groove is provided with an opening, the groove depth of the guide groove is gradually reduced from the opening to the side close to the locking hole, and the guide groove is configured to guide the locking pin to slide into the locking hole.

Description

Technical Field

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

[0002] Chairs are essential living furniture in everyday life. They typically consist of four parts: a backrest, seat, pneumatic rod, and legs. Existing chairs primarily utilize modular production, manufacturing and processing these four components separately, greatly improving their usability. Furthermore, because the entire chair occupies a large space and is inconvenient to package and transport, existing manufacturers typically separate the backrest, seat, pneumatic rod, and legs, packaging and shipping them separately to reduce packaging and transportation costs. This significantly reduces the space occupied and effectively reduces packaging and transportation costs.

[0003] However, disassembling the entire chair for packaging means that users need to manually assemble the seat after receiving it. However, for most users, manual assembly is a complex and tedious operation. Even if they follow the instructions, they may still make assembly errors such as misplacing parts or tightening screws too loosely or too tightly.

[0004] Therefore, how to reduce the space occupied by seats, lower packaging and transportation costs, and facilitate assembly operations for users has become the main problem that needs to be solved. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a chair with a backrest flip adjustment mechanism. By hingedly connecting both sides of the backrest body to the support frame, the backrest body can be flipped forward to fit the seat body when the seat needs to be stored, significantly reducing the space occupied by the seat and effectively reducing the packaging and transportation costs of the seat. In addition, the backrest connecting portion and the support frame are connected by a locking pin and a locking hole, so that the manufacturer can directly assemble the backrest assembly and the seat assembly before shipping. After receiving the goods, the user only needs to flip the backrest body backward until the backrest body is upright and the locking pin is engaged with the locking hole to use the seat normally, thereby greatly simplifying the assembly operation of the seat and facilitating user use. By providing a guide groove, when the backrest assembly switches from the storage state to the use state, the locking pin can automatically engage the locking hole under the guidance of the guide groove, eliminating the need for the user to manually adjust the locking pin, thereby further increasing the convenience of the backrest assembly adjustment operation.

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

[0007] The present application provides a seat with a seat back flip adjustment mechanism, comprising:

[0008] A seat back assembly, comprising a seat back body and seat back connecting portions symmetrically arranged on the left and right sides of the seat back body;

[0009] The seat assembly includes a seat body and support frames symmetrically arranged on the left and right sides of the seat body, with the support frames extending vertically beyond the upper surface of the seat body; two backrest connecting parts are respectively hinged to the support frames on the left and right sides, thereby driving the backrest body to flip forward and backward relative to the seat body;

[0010] The locking structure includes a locking pin and a locking hole that engage with each other, the locking pin being movably provided in one of the seat back connection part and the support frame, and the locking hole being provided in the other of the seat back connection part and the support frame; the seat back assembly has a switchable use state and a storage state, in the use state, the locking pin is engaged with the locking hole, so that the seat back connection part and the support frame remain relatively fixed, thereby enabling the seat back body to remain in a vertical state; in the storage state, the locking pin is disengaged from the locking hole, so that the seat back connection part can be rotated relative to the support frame again, and the seat back body flips forward until the top end of the seat back body touches the seat body, thereby lowering the overall height of the seat;

[0011] Along the rotation trajectory of the locking pin, a guide groove is provided in the chair back connection part or support frame recessed with the locking hole. One side of the guide groove is connected to the locking hole, and the other side is open. The depth of the guide groove gradually decreases from the opening to the side close to the locking hole. The guide groove is configured to guide the locking pin to slide into the locking hole.

[0012] Furthermore, a mounting hole is recessed at one end of the support frame near the seatback connection portion, through which a locking pin is slidably connected to the support frame. A corresponding locking hole is provided on the seatback connection portion. By providing the locking hole on the seatback connection portion, the locking structure can be easily adjusted to lock or unlock from the inside of the seat.

[0013] Furthermore, a push rod is slidably connected to the locking hole. When in use, the locking pin engages the locking hole, and the push rod avoids the locking pin. When the seat back assembly is switched to the stowed position, the push rod moves toward the locking pin until it is pushed out of the locking hole, allowing the seat back connection to rotate relative to the support frame again. The locking mechanism is switched between locked and unlocked by pushing the locking pin with the push rod, resulting in a simple structure and easy operation.

[0014] Furthermore, a sliding hole is recessed on the side of the seat back connection away from the support frame. The sliding hole connects to the locking hole, and an adjustment switch is slidably connected to the sliding hole. The end of the adjustment switch away from the locking pin extends through the sliding hole, and the end of the adjustment switch closer to the locking pin extends to form a push rod. To switch the seat back assembly to the stowed position, the user simply presses both adjustment switches simultaneously, further facilitating operation.

[0015] Furthermore, a first cover plate is detachably connected to the side of the seat back connection near the support frame, with a locking hole defined in the first cover plate. A first annular positioning protrusion is provided around the adjustment switch, and a second annular positioning protrusion is provided on the inner wall of the sliding hole. The first positioning protrusion is positioned between the second positioning protrusion and the first cover plate, preventing the adjustment switch from being disengaged from the sliding hole. This not only improves the stability of the locking structure but also makes installation of the adjustment switch easier.

[0016] Furthermore, a first return spring is disposed within the sliding hole, pushing against the adjustment switch, ensuring that the adjustment switch always tends to move away from the support frame. This not only ensures that the locking pin can be stably engaged in the locking hole, but also allows the adjustment switch to automatically return to its original position under the action of the first return spring, further enhancing the convenience of adjusting the locking structure.

[0017] Furthermore, a second return spring is installed in the mounting hole. This second return spring pushes the locking pin, ensuring that the locking pin always has a force to move toward the seat back connection portion. This allows the locking pin to be stably engaged in the locking hole. Furthermore, the locking pin automatically returns to its original position under the action of the second return spring, further enhancing the convenience of adjusting the locking structure.

[0018] Furthermore, a second cover plate is detachably connected to one side of the support frame near the seatback connection. This second cover plate has a through-hole through which one side of the locking pin passes. A third positioning protrusion is provided around the locking pin. The diameter of the third positioning protrusion is larger than the through-hole, preventing the locking pin from detaching from the support frame through the through-hole. This not only improves the stability of the locking structure but also makes installation of the locking pin easier.

[0019] Furthermore, a positioning structure is provided between the backrest connection and the support frame. The positioning structure comprises a positioning portion and a positioning slot that engage with each other. The positioning portion is provided in one of the backrest connection and the support frame, and the positioning slot is provided in one of the backrest connection and the support frame. When in use, the positioning portion engages with the positioning slot, preventing the backrest connection from further rotating backward relative to the support frame. By providing a positioning structure to limit the tilting angle of the backrest connection, the backrest assembly is prevented from tilting when the user leans on it, thereby improving the stability of the backrest assembly.

[0020] Furthermore, a positioning portion is provided at the front end of the support frame, and a corresponding positioning slot is provided on the seatback connection portion, with the front side of the positioning slot being open. When the seatback assembly is switched from the stowed position to the use position, the positioning portion engages with the positioning slot from the front side. When the seatback assembly is switched from the use position to the stowed position, the positioning portion can also disengage from the slot from the opening. This not only limits the tilting angle of the seatback connection portion through the positioning structure, but also allows the positioning portion to engage and disengage from the slot from the opening, further enhancing the convenience of seatback assembly adjustment.

[0021] Furthermore, the backrest assembly includes a back support, which is located at the rear of the backrest body. The left and right sides of the back support extend forward to form a backrest connection portion. The back support supports the backrest body and drives the backrest body to flip forward and backward, which not only improves the stability of the backrest assembly but also allows the user to directly adjust the backrest assembly through the back support, further enhancing the convenience of adjustment.

[0022] The seat with a tiltable seat back adjustment mechanism provided by the present application is configured such that the backrest body is hingedly connected to the support frame at both sides. When the seat needs to be stored, the backrest body is tilted forward to fit the seat body, without increasing the space occupied by the seat in the horizontal direction and significantly reducing the space occupied by the seat in the height direction, thereby significantly reducing the space occupied by the seat and effectively reducing the packaging and transportation costs of the seat. In addition, the backrest connecting portion and the support frame are connected by a locking pin and a locking hole in a snap-fit manner, which not only makes the locking or unlocking operation between the two easier, but also ensures that the connection strength between the backrest connecting portion and the support frame is more reliable when in use, thereby ensuring the supporting effect of the backrest body. In addition, the manufacturer can directly assemble the backrest assembly and the seat assembly when shipping. After receiving the goods, the user only needs to flip the backrest body backward until the backrest body is upright and the locking pin is engaged with the locking hole, and then the seat can be used normally, thereby greatly simplifying the assembly operation of the seat and facilitating use by the user.

[0023] Furthermore, by providing the guide groove, when the seat back assembly is switched from the stowed state to the use state, the locking pin first slides into the guide groove from the opening side. As the locking pin slides along the guide groove, the depth of the guide groove gradually decreases, forcing the locking pin to move away from the seat back connection portion. When the seat back assembly is fully switched to the use state, the locking pin slides into the guide groove and aligns with the locking hole. Pushed by the second return spring, the locking pin engages with the locking hole to complete the locking. Thus, by providing the guide groove, when the seat back assembly is switched from the stowed state to the use state, the locking pin automatically engages with the locking hole under the guidance of the guide groove, eliminating the need for the user to manually adjust the locking pin, thereby further enhancing the convenience of the seat back assembly adjustment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a seat provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the side structure of a seat in use provided by an embodiment of the present application;

[0027] Figure 3 A schematic diagram of the side structure of the seat in the stowed state provided by an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the three-dimensional structure of the chair back connection portion and the support frame in the stowed state provided by an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the connection structure between the chair back connecting portion and the support frame provided in an embodiment of the present application;

[0030] Figure 6 A schematic diagram of the internal structure of the support frame provided in an embodiment of the present application;

[0031] Figure 7 A schematic diagram of the internal structure of the chair back connection portion provided in an embodiment of the present application;

[0032] Figure 8 This is a schematic diagram of the cross-sectional structure of the chair back connection portion and the support frame when switching from the use state to the storage state provided in an embodiment of the present application.

[0033] The figures are marked as follows: 1-backrest body, 101-back bracket, 102-rotating shaft, 110-backrest connecting part, 111-guide groove, 112-first connecting groove, 120-locking hole, 130-sliding hole, 131-second positioning protrusion, 132-first return spring, 140-adjusting switch, 141-pushing rod, 142-first positioning protrusion, 150-first cover plate, 160-positioning groove, 2-seat body, 3-support frame, 301-mounting hole, 302-second return spring, 303-rotating support hole, 304-second connecting groove, 310-locking pin, 311-third positioning protrusion, 320-second cover plate, 321-through hole, 330-positioning part. DETAILED DESCRIPTION

[0034] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0035] Please refer to the attached Figure 1-8 , an embodiment of the present application provides a seat with a seat back flip adjustment mechanism, comprising:

[0036] The backrest assembly includes a backrest body 1 and backrest connecting portions 110 symmetrically arranged on the left and right sides of the backrest body 1;

[0037] The seat assembly includes a seat body 2 and support frames 3 symmetrically arranged on the left and right sides of the seat body 2. In the vertical direction, the support frames 3 extend beyond the upper surface of the seat body 2. The two backrest connecting parts 110 are respectively hinged to the support frames 3 on the left and right sides, thereby driving the backrest body 1 to flip forward and backward relative to the seat body 2.

[0038] The locking structure includes a locking pin 310 and a locking hole 120 that engage with each other. The locking pin 310 is movably provided in one of the seat back connecting portion 110 and the support frame 3, and the locking hole 120 is provided in the other of the seat back connecting portion 110 and the support frame 3; the seat back assembly has a switchable use state and a storage state. In the use state, the locking pin 310 is engaged with the locking hole 120, so that the seat back connecting portion 110 and the support frame 3 remain relatively fixed, thereby allowing the seat back body 1 to remain in a vertical state; in the storage state, the locking pin 310 is disengaged from the locking hole 120, so that the seat back connecting portion 110 can be rotated relative to the support frame 3 again, and the seat back body 1 flips forward until the top end of the seat back body 1 is in contact with the seat body 2, thereby lowering the overall height of the seat;

[0039] Along the rotation trajectory of the locking pin 310, the chair back connecting part 110 or the support frame 3 provided with the locking hole 120 is recessed with a guide groove 111. One side of the guide groove 111 is connected to the locking hole 120, and the other side is open. From the opening to the side close to the locking hole 120, the groove depth of the guide groove 111 gradually decreases. The guide groove 111 is configured to guide the locking pin 310 to slide into the locking hole 120.

[0040] In this embodiment, by hingedly connecting the two sides of the chair back body 1 to the support frame 3, when the seat needs to be stored, the chair back body 1 is flipped forward to fit the seat body 2, which does not increase the horizontal space occupied by the seat while greatly reducing the space occupied by the seat in the height direction, thereby greatly reducing the space occupied by the seat and effectively reducing the packaging and transportation cost of the seat; and, the chair back connecting part 110 and the support frame 3 are connected by the locking pin 310 and the locking hole 120, which not only makes the locking or unlocking operation between the two easier, but also makes the connection strength between the chair back connecting part 110 and the support frame 3 more reliable when in use, thereby ensuring the supporting effect of the chair back body 1; and thus, the manufacturer can directly assemble the chair back assembly and the seat assembly when shipping. After receiving the goods, the user only needs to flip the chair back body 1 backward until the chair back body 1 is vertical and the locking pin 310 is engaged with the locking hole 120, and then the seat can be used normally, thereby greatly simplifying the assembly operation of the seat and facilitating user use.

[0041] Furthermore, by providing the guide slot 111, when the seat back assembly is switched from the stowed state to the in-use state, the locking pin 310 first slides into the guide slot 111 from the open side. As the locking pin 310 slides along the guide slot 111, the depth of the guide slot 111 gradually decreases, forcing the locking pin 310 to move away from the seat back connection portion 110. When the seat back assembly is fully switched to the in-use state, the locking pin 310 slides through the guide slot 111 and aligns with the locking hole 120. Pushed by the second return spring 302, the locking pin 310 engages with the locking hole 120, completing the locking operation. Thus, by providing the guide slot 111, when the seat back assembly is switched from the stowed state to the in-use state, the locking pin 310 automatically engages with the locking hole 120 under the guidance of the guide slot 111, eliminating the need for the user to manually adjust the locking pin 310, thereby further enhancing the convenience of adjusting the seat back assembly.

[0042] Preferably, the locking pin 310 is disposed on the support frame 3, and an arc-shaped guide groove 111 is provided on both the seat back connection portion 110 and the first cover plate 150, with the opening of the guide groove 111 facing forward, so that when the seat back assembly switches from the storage state to the use state, the locking pin 310 can slide from the opening into the guide groove 111. Of course, in other embodiments of the present application, when the locking pin 310 is disposed on the seat back connection portion 110, the support frame 3 and the second cover plate 320 are correspondingly provided with a guide groove 111, and the opening of the guide groove 111 faces backward.

[0043] Preferably, the backrest connection portion 110 and the support frame 3 are hingedly connected via a pivot mechanism. A pivot 102 is provided on the backrest connection portion 110, and a corresponding rotation support hole 303 is provided on the support frame 3. The support frame 3 rotates about the pivot 102 via the rotation support hole 303, resulting in a simple structure and ease of manufacture. Of course, in other embodiments of the present application, the pivot 102 may be provided on the support frame 3, and the rotation support hole 303 may be provided on the backrest connection portion 101.

[0044] Please refer to the attached Figure 5-6 In some embodiments of the present application, a mounting hole 301 is recessed at one end of the support frame 3 near the seatback connection portion 110. A locking pin 310 is slidably connected to the support frame 3 through the mounting hole 301. A corresponding locking hole 120 is provided on the seatback connection portion 110. By providing the locking hole 120 on the seatback connection portion 110, it is convenient to adjust the locking structure to lock or unlock from the inside of the seat.

[0045] Of course, in other embodiments of the present application, the locking pin 310 may be provided on the seat back connecting portion 110 , and the locking hole 120 may be provided on the support frame 3 .

[0046] Please refer to the attached Figure 7-8In some embodiments of the present application, a push rod 141 is slidably connected to the locking hole 120. When in use, the locking pin 310 engages the locking hole 120, and the push rod 141 avoids the locking pin 310. When the seat back assembly is switched to the stowed state, the push rod 141 moves toward the locking pin 310 until the locking pin 310 is pushed out of the locking hole 120, allowing the seat back connection portion 110 to rotate relative to the support frame 3 again. The locking mechanism is switched between locked and unlocked by pushing the locking pin 311 by the push rod 141, resulting in a simple structure and easy operation.

[0047] Please refer to the attached Figure 7-8 In some embodiments of the present application, a sliding hole 130 is recessed on the side of the chair back connection part 110 away from the support frame 3, and the sliding hole 130 is connected to the locking hole 120. An adjustment switch 140 is slidably connected in the sliding hole 130, and the end of the adjustment switch 140 away from the locking pin 310 passes through the sliding hole 130, and the end of the adjustment switch 140 close to the locking pin 310 extends to form a push rod 141.

[0048] In this embodiment, an adjustment switch 140 is provided to control the sliding of the push rod 141. When the user switches the chair back assembly to the storage state, he only needs to press the adjustment switches 140 on both sides at the same time, so that the locking pins 310 on both sides are pushed out of the locking holes 120 by the push rod 141, and the chair back body 1 can be flipped, which further facilitates the user's operation.

[0049] Please refer to the attached Figure 7 In some embodiments of the present application, a first cover plate 150 is detachably connected to a side of the chair back connection portion 110 close to the support frame 3, and the locking hole 120 is opened in the first cover plate 150; an annular first positioning protrusion 142 is provided on the peripheral side of the adjustment switch 140, and an annular second positioning protrusion 131 is correspondingly provided on the inner wall of the sliding hole 130. The first positioning protrusion 142 is positioned between the second positioning protrusion 131 and the first cover plate 150, so that the adjustment switch 140 cannot be separated from the sliding hole 130.

[0050] In this embodiment, the first cover plate 150 and the second positioning protrusion 131 are provided to limit the adjustment switch 140, so as to prevent the adjustment switch 140 from being detached from the chair back connection part 110 during use, thereby improving the stability of the locking structure; and when installing the adjustment switch 140, the adjustment switch 140 can be directly inserted from the side of the sliding hole 130 where the second positioning protrusion 131 is not provided, and then the first cover plate 150 is covered to complete the installation of the adjustment switch 140, making the installation operation of the adjustment switch 140 relatively simple.

[0051] Among them, preferably, the first cover plate 150 is fixed to the seat back connection part 110 by screw connection, which not only makes the connection strength between the first cover plate 150 and the seat back connection part 110 higher, but also makes the installation and disassembly operations of the first cover plate 150 easier.

[0052] Among them, a first connecting groove 112 is recessed on the seat back connecting part 110, and the first cover plate 150 is clamped to the seat back connecting part 110 through the first connecting groove 112. After the first cover plate 150 is installed, its outer surface is flush with the outer surface of the seat back connecting part 110, which not only improves the connection strength between the first cover plate 150 and the seat back connecting part 110, but also makes the structure of the seat back connecting part 110 simpler and more integrated.

[0053] Please refer to the attached Figure 7 In some embodiments of the present application, a first return spring 132 is provided in the sliding hole 130 , and the first return spring 132 pushes the adjustment switch 140 so that the adjustment switch 140 always has a tendency to move in a direction away from the support frame 3 .

[0054] In this embodiment, by providing a first return spring 132, when in use, the first return spring 132 pushes the adjustment switch 140, so that the push rod 141 always has a tendency to move in the direction away from the locking pin 310, thereby avoiding the locking pin 310, so that the locking pin 310 can be stably stuck in the locking hole 120; and after the chair back assembly is switched to the storage state, the adjustment switch 140 can be automatically reset under the action of the first return spring 132, without the need for manual adjustment by the user, thereby further improving the convenience of the locking structure adjustment operation.

[0055] Please refer to the attached Figure 6 In some embodiments of the present application, a second return spring 302 is provided in the mounting hole 301 , and the second return spring 302 pushes the locking pin 310 , so that the locking pin 310 always has the force to move toward the seat back connection portion 110 .

[0056] In this embodiment, by providing a second return spring 302, when in use, the locking pin 310 always has a tendency to move toward the locking hole 120 under the elastic force of the second return spring 302, so that the locking pin 310 can be stably engaged in the locking hole 120; and after the chair back assembly is switched to the storage state, the locking pin 310 can automatically reset under the action of the second return spring 302, without the need for manual adjustment by the user, thereby further improving the convenience of the locking structure adjustment operation.

[0057] Please refer to the attached Figure 6In some embodiments of the present application, a second cover plate 320 is detachably connected to one side of the support frame 3 near the chair back connection portion 110, and a through hole 321 is provided on the second cover plate 320, through which one side of the locking pin 310 passes; a third positioning protrusion 311 is provided on the peripheral side of the locking pin 310, and the diameter of the third positioning protrusion 311 is larger than the through hole 321, so that the locking pin 310 cannot detach from the support frame 3 through the through hole 321.

[0058] In this embodiment, a second cover plate 320 is provided to limit the locking pin 310, so as to prevent the locking pin 310 from detaching from the support frame 3 during use, thereby improving the stability of the locking structure; and when installing the locking pin 310, the locking pin 310 can be directly inserted into the opening of the mounting hole 301, and then the second cover plate 320 is covered, and one end of the locking pin 310 is passed through the through hole 321, so that the locking pin 310 is positioned on the support frame 3, making the installation operation of the locking pin 310 relatively simple.

[0059] Among them, preferably, the second cover plate 320 is fixed to the support frame 3 by screw connection, which not only makes the connection strength between the second cover plate 320 and the support frame 3 higher, but also makes the installation and disassembly operations of the second cover plate 320 easier.

[0060] Among them, a second connecting groove 304 is recessed on the support frame 3, and the second cover plate 320 is clamped on the support frame 3 through the second connecting groove 304, and after the second cover plate 320 is installed, its outer surface is flush with the outer surface of the support frame 3, which not only improves the connection strength between the second cover plate 320 and the support frame 3, but also makes the structure of the support frame 3 simpler and more integrated.

[0061] Please refer to the attached Figure 5-7 In some embodiments of the present application, a positioning structure is further provided between the backrest connection portion 110 and the support frame 3. The positioning structure includes a positioning portion 330 and a positioning slot 160 that engage with each other. The positioning portion 330 is provided in one of the backrest connection portion 110 and the support frame 3, and the positioning slot 160 is provided in one of the backrest connection portion 110 and the support frame 3. During use, the positioning portion 330 engages with the positioning slot 160, preventing the backrest connection portion 110 from further rotating backward relative to the support frame 3. By providing a positioning structure to limit the tilting angle of the backrest connection portion 110, the backrest assembly is prevented from tilting when the user leans on it during use, thereby improving the stability of the backrest assembly.

[0062] Please refer to the attached Figure 5-7In some embodiments of the present application, a positioning portion 330 is provided at the front end of the support frame 3, and a corresponding positioning slot 160 is provided on the seatback connecting portion 110, with the front side of the positioning slot 160 being open. When the seatback assembly switches from the stowed state to the use state, the positioning portion 330 engages with the positioning slot 160 from the front side of the positioning slot. When the seatback assembly switches from the use state to the stowed state, the positioning portion 330 can also disengage from the positioning slot 160 from the opening. Thus, not only is the tilting angle of the seatback connecting portion 110 limited by the positioning structure, but the positioning portion 330 can also engage or disengage from the positioning slot 160 from the opening, further enhancing the convenience of the seatback assembly adjustment operation.

[0063] Of course, in other embodiments of the present application, the positioning portion 330 can also be arranged at the rear end of the chair back connecting portion 110, and a positioning groove 160 is correspondingly provided on the support frame 3, and the rear side opening of the positioning groove 160 is provided, so that when the chair back assembly is switched from the storage state to the use state, the positioning portion 330 is inserted into the positioning groove 160 from the opening.

[0064] Please refer to the attached Figure 1-3 In some embodiments of the present application, the backrest assembly includes a back support 101 disposed on the rear side of the backrest body 1. The left and right sides of the back support 101 extend forward to form a backrest connection portion 110. The back support 101 supports the backrest body 1 and drives the backrest body 1 to flip forward and backward, which not only improves the stability of the backrest assembly but also allows the user to directly adjust the backrest assembly through the back support 101, further improving the convenience of the adjustment operation.

[0065] Preferably, the chair back body 1 is a double-back structure, including two symmetrical backrests, and both backrests can be further adjusted up and down relative to the back support, so that the chair back body 1 can better fit the user's back and provide a more comfortable support experience. Of course, in other embodiments of the present application, the chair back body 1 can also be a single-back structure.

[0066] 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 the indicated technical features. 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 invention, unless otherwise specified, "multiple" means more than three.

[0067] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A seat with a seat back flip adjustment mechanism, characterized in that: include: A chair back assembly, the chair back assembly comprising a chair back body (1) and chair back connecting portions (110) symmetrically arranged on the left and right sides of the chair back body (1); A chair seat assembly, comprising a chair seat body (2) and support frames (3) symmetrically arranged on the left and right sides of the chair seat body (2), wherein the support frames (3) extend beyond the upper surface of the chair seat body (2) in the vertical direction; the two backrest connecting parts (110) are respectively hinged to the support frames (3) on the left and right sides, thereby driving the backrest body (1) to flip forward and backward relative to the chair seat body (2); A locking structure, the locking structure comprising a locking pin (310) and a locking hole (120) that are engaged with each other, the locking pin (310) being movably arranged in one of the chair back connection part (110) and the support frame (3), and the locking hole (120) being arranged in the other of the chair back connection part (110) and the support frame (3); the chair back assembly has a switchable use state and a storage state, in the use state, the locking pin (310) is engaged with the locking hole (120), so that the chair back connection part (110) and the support frame (3) remain relatively fixed, thereby enabling the chair back body (1) to remain in a vertical state; in the storage state, the locking pin (310) is disengaged from the locking hole (120), so that the chair back connection part (110) can be rotated relative to the support frame (3) again, and the chair back body (1) flips forward until the top end of the chair back body (1) is in contact with the seat body (2), thereby lowering the overall height of the seat; Along the rotation trajectory of the locking pin (310), the chair back connecting portion (110) or the support frame (3) provided with the locking hole (120) is recessed with a guide groove (111), one side of the guide groove (111) is connected to the locking hole (120), and the other side is open, and the groove depth of the guide groove (111) gradually decreases from the opening to the side close to the locking hole (120), and the guide groove (111) is configured to guide the locking pin (310) to slide into the locking hole (120).

2. The seat with a seat back tilt adjustment mechanism according to claim 1, characterized in that: An end of the support frame (3) close to the chair back connecting portion (110) is recessed and provided with a mounting hole (301); the locking pin (310) is slidably connected to the support frame (3) through the mounting hole (301); and the chair back connecting portion (110) is correspondingly provided with the locking hole (120).

3. The seat with a seat back tilt adjustment mechanism according to claim 2, characterized in that: A push rod (141) is slidably connected in the locking hole (120); in the use state, the locking pin (310) is inserted into the locking hole (120), and the push rod (141) avoids the locking pin (310); when the chair back assembly is switched to the storage state, the push rod (141) moves toward the locking pin (310) until the locking pin (310) is pushed out of the locking hole (120), so that the chair back connection part (110) can be rotated relative to the support frame (3) again.

4. The seat with a seat back tilt adjustment mechanism according to claim 3, characterized in that: A sliding hole (130) is recessed on one side of the chair back connection portion (110) away from the support frame (3), the sliding hole (130) is connected to the locking hole (120), an adjustment switch (140) is slidably connected in the sliding hole (130), an end of the adjustment switch (140) away from the locking pin (310) passes through the sliding hole (130), and an end of the adjustment switch (140) close to the locking pin (310) extends to form the push rod (141).

5. The seat with a seat back tilt adjustment mechanism according to claim 4, characterized in that: A first cover plate (150) is detachably connected to a side of the chair back connection portion (110) close to the support frame (3), and the locking hole (120) is opened in the first cover plate (150); an annular first positioning protrusion (142) is provided on the peripheral side of the adjustment switch (140), and an annular second positioning protrusion (131) is correspondingly provided on the inner wall of the sliding hole (130), and the first positioning protrusion (142) is positioned between the second positioning protrusion (131) and the first cover plate (150), so that the adjustment switch (140) cannot be separated from the sliding hole (130).

6. The seat with a seat back tilt adjustment mechanism according to claim 4, characterized in that: A first return spring (132) is provided in the sliding hole (130), and the first return spring (132) pushes the regulating switch (140), so that the regulating switch (140) always has a tendency to move in a direction away from the support frame (3).

7. The seat with a seat back tilt adjustment mechanism according to claim 2, characterized in that: A second return spring (302) is provided in the mounting hole (301), and the second return spring (302) pushes the locking pin (310), so that the locking pin (310) always has a force to move toward the chair back connecting portion (110).

8. The seat with a seat back tilt adjustment mechanism according to claim 2, characterized in that: A second cover plate (320) is detachably connected to one side of the support frame (3) near the chair back connection portion (110), and a through hole (321) is provided on the second cover plate (320), through which one side of the locking pin (310) passes; a third positioning protrusion (311) is provided on the peripheral side of the locking pin (310), and the diameter of the third positioning protrusion (311) is larger than that of the through hole (321), so that the locking pin (310) cannot be separated from the support frame (3) through the through hole (321).

9. The seat with a seat back tilt adjustment mechanism according to claim 1, characterized in that: A positioning structure is further provided between the chair back connection portion (110) and the support frame (3), the positioning structure comprising a positioning portion (330) and a positioning slot (160) that are engaged with each other, the positioning portion (330) being provided at one of the chair back connection portion (110) and the support frame (3), and the positioning slot (160) being provided at one of the chair back connection portion (110) and the support frame (3); in a use state, the positioning portion (330) is engaged with the positioning slot (160), so that the chair back connection portion (110) cannot continue to rotate backward relative to the support frame (3).

10. The seat with a seat back tilt adjustment mechanism according to claim 9, characterized in that: The front end of the support frame (3) is provided with the positioning portion (330), and the chair back connecting portion (110) is correspondingly provided with the positioning groove (160), and the front side of the positioning groove (160) is opened; when the chair back assembly is switched from a storage state to a use state, the positioning portion (330) is inserted into the positioning groove (160) from the front side of the positioning groove (160).

11. The seat with a seat back tilt adjustment mechanism according to claim 1, characterized in that: The chair back assembly comprises a back support (101), wherein the back support (101) is arranged on the rear side of the chair back body (1), and the left and right sides of the back support (101) extend forward to form the chair back connecting portion (110).

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