Seat folding mechanism and folding vehicle thereof

Abstract

This utility model relates to the technical field of folding strollers, and proposes a seat folding mechanism and a folding stroller thereof. The seat folding mechanism includes a foldable and unfoldable seat assembly, a handle assembly, a lock assembly, and an unlocking component. A linkage assembly synchronously connects the handle assembly and the seat assembly. The handle assembly can switch between a folded state and an unfolded state. The handle assembly and the second linkage of the linkage assembly are hinged. The lock assembly is movably disposed in the rotational opening and closing position of the handle assembly and constrains the folding of the handle assembly in the locked position. The unlocking component is movably disposed on the handle assembly and is drively connected to the lock assembly. When the handle assembly switches from unfolded to folded, the unlocking component triggers the lock assembly to move to the unlocked position. The handle assembly is folded under the push and drives the second linkage to rotate, thereby driving the linkage assembly and the seat assembly to rotate, so as to realize the synchronous folding of the handle assembly and the seat assembly. When the handle assembly is unfolded, it unfolds synchronously with the seat assembly through the second linkage and the linkage assembly.

Description

Technical Field

[0001] This utility model relates to the technical field of children's stroller folding, specifically to a seat folding mechanism and its folding stroller. Background Technology

[0002] For ease of storage and portability, modern strollers are typically designed with a foldable structure. Various stroller folding solutions already exist in the market, some of which aim to achieve one-handed operation or one-step folding to improve the user experience.

[0003] For example, Chinese invention patent CN117163137A discloses a stroller that includes a handlebar, a second connecting rod, a telescopic rod assembly, a rear leg rod assembly, a backrest rod assembly, and a seat rod assembly. This stroller uses a first unlocking component to operate a complex locking transmission assembly, releasing multiple locks almost simultaneously between the handlebar and the second connecting rod, inside the telescopic rod assembly, and between the rear leg rod assembly and the linkage and linkage rod assembly. Once these locks are released, a first elastic element located between the seat rod assembly and the backrest rod assembly acts as the primary driving force, causing the second connecting rod, telescopic rod assembly, front leg rod assembly, backrest rod assembly, and seat rod assembly to rotate towards the rear leg rod assembly, thus completing the folding process. This stroller involves multiple specialized locking components and transmission components (such as the locking transmission assembly, first and second transmission components, and second locking components), resulting in a complex structure, a large number of parts, and high manufacturing costs. The complex mechanism also increases the difficulty of assembly.

[0004] Therefore, further improvements are needed. Utility Model Content

[0005] This utility model proposes a seat folding mechanism and its folding vehicle. The locking assembly is unlocked by triggering the unlocking component. Only by pushing the handle assembly, the second link can be rotated through the hinge relationship between the handle assembly and the second link, thereby causing the link assembly and the seat assembly to rotate, so as to realize the synchronous folding of the handle assembly and the seat assembly.

[0006] A seat folding mechanism designed for this purpose includes a seat assembly mounted on a vehicle frame, the seat assembly being foldable and unfoldable, and also includes components mounted on the vehicle frame: The handle assembly can switch between a folded state and an unfolded state; Linkage assembly, used to synchronously connect the seat assembly and the handle assembly; A locking assembly, which is movably positioned in the rotating open / closed position of the handle assembly and constrains the folding of the handle assembly in the locked position; The unlocking component is movable on the handle assembly and is drivenly connected to the lock assembly; When the handle assembly switches from unfolded to folded, the locking component is triggered by the unlocking mechanism to move to the unlocked position. The handle assembly is folded under the push and drives the linkage assembly to rotate, so as to realize the synchronous folding of the handle assembly and the seat assembly. When the handle assembly is unfolded, it unfolds synchronously with the seat assembly through the linkage assembly.

[0007] The seat assembly includes a front seat bar and a rear seat bar that are hinged together. The rear seat bar is fixed to the frame. The front seat bar, the linkage assembly, and the handlebar assembly are connected in sequence to form a linkage mechanism that allows the seat assembly and the handlebar assembly to fold and unfold synchronously.

[0008] The linkage assembly includes a first linkage and a second linkage. The seat front rod, the first linkage, the second linkage and the handle assembly are connected in sequence to form a linkage structure, so that the seat assembly can move synchronously when the handle assembly is unfolded or folded.

[0009] A fastener is provided between the rear seat post and the vehicle frame. When the seat assembly is unfolded, the fastener is used to maintain the relative position between the rear seat post and the vehicle frame.

[0010] The seat assembly also includes a backrest bar, which is mounted on the seat cushion rear bar or on the fabric cover.

[0011] The front rod of the seat cushion is provided with a fastener, one end of which is fixed to the front rod of the seat cushion, and the other end of which is connected to the first connecting rod.

[0012] The handle assembly includes an upper push handle and a lower push handle, and an upper joint for mounting a lock assembly is provided between the upper push handle and the lower push handle; The lock assembly includes a drive component, a locking gear, and a spring. The unlocking component is mounted on the upper push handle and is connected to the drive component. The two ends of the spring abut against the locking gear and the inner side of the upper joint, respectively. When the locking assembly is locked, the locking gear engages with the two inner sides of the upper joint. When the unlocking component is operated, the driving component is triggered to move the locking gear and compress the spring, so that the locking gear disengages from one inner side of the upper joint, thereby unlocking.

[0013] The unlocking component is press-type mounted on the upper push handle, and the upper push handle contains a transmission component. The first end of the transmission component is connected to the unlocking component, and the second end of the transmission component is connected to the driving component.

[0014] The driving component is rotatably connected to the inner side of the upper joint. The driving component is provided with a number of circumferentially spaced guide grooves, and the inner side of the upper joint is provided with a number of circumferentially spaced helical teeth. Each helical tooth is matched with a guide groove. When the driving component is triggered to rotate by the unlocking component, the driving component moves axially within the upper joint through the guide grooves and helical teeth. The upper joint includes a first inner joint and a first outer joint that are rotatably connected. The inner sides of the first inner joint and the first outer joint are respectively provided with a number of circumferentially spaced tooth grooves. The locking gear meshes with the tooth grooves on the two inner sides of the upper joint when the locking assembly is locked. The first inner joint is fixedly connected to the upper push handle, and the first outer joint is fixedly connected to the lower push handle; One end of the first inner joint is hinged to one end of the connecting rod assembly.

[0015] A folding bicycle includes a frame on which the aforementioned seat folding mechanism is provided; the frame also includes a foldable and unfoldable caster assembly, the lower parts of a handle assembly and a linkage assembly are respectively connected to the caster assembly, and the seat assembly is connected to the upper part of the caster assembly; During the folding or unfolding of the handle assembly, the linkage assembly drives the caster frame assembly to rotate, so as to achieve synchronous folding and unfolding of the handle assembly, seat assembly and caster frame assembly.

[0016] The upper part of the caster frame assembly is provided with a lower joint, which includes a second inner joint and a second outer joint that are rotatably connected; the second inner joint is fixedly connected to the rear section of the seat assembly, and the second outer joint is fixedly connected to the lower part of the handle assembly; one end of the linkage assembly is connected to the front section of the seat assembly. The caster frame assembly includes a rear caster frame and a front caster frame; the rear caster frame is fixedly connected to the second inner joint, and the front caster frame is hinged to the second inner joint, so that the caster frame assembly can be folded and unfolded.

[0017] A connector is provided between the front caster frame and the vehicle frame. When the caster frame assembly is in the unfolded state, the connector is used to maintain the relative position between the front caster frame and the vehicle frame.

[0018] The beneficial technical effects of this utility model are as follows: In this technical solution, when the seat assembly and handle assembly switch from unfolded to folded, the locking assembly is unlocked by triggering the unlocking mechanism. Simply pushing the handle assembly activates the second link in the linkage assembly via a hinge, causing the second link to rotate. This, in turn, rotates the linkage assembly and the seat assembly, achieving synchronous folding of the handle and seat assemblies. The overall structure eliminates the need for multiple locking transmission components, significantly simplifying the structure, reducing the number of parts, and lowering manufacturing costs and assembly difficulty. Furthermore, the operation is simple, requiring only the operation of the unlocking mechanism and pushing the handle assembly, enhancing user convenience. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the unfolded frame of the first embodiment of this utility model.

[0020] Figure 2 for Figure 1 A schematic diagram of the internal cross-sectional structure at point A.

[0021] Figure 3 This is a three-dimensional structural diagram of the backrest rod in the first embodiment of the present invention, showing how the backrest rod descends under the action of gravity when the handle assembly is pushed and folded.

[0022] Figure 4 for Figure 3 A schematic diagram of the internal cross-sectional structure at point B.

[0023] Figure 5 This is an exploded view of the assembly structure of the joint and locking components in the first embodiment of this utility model.

[0024] Figure 6 This is an exploded view of the assembly structure of the joint and locking components in another position according to the first embodiment of this utility model.

[0025] Figure 7 This is a three-dimensional structural diagram showing the disassembled assembly of the vehicle frame according to the first embodiment of this utility model.

[0026] Figure 8 This is a three-dimensional structural diagram of the seat assembly according to the first embodiment of the present invention.

[0027] Figure 9 This is a three-dimensional structural diagram of the caster bracket assembly according to the first embodiment of this utility model.

[0028] Figure 10 This is a three-dimensional structural diagram of the handle assembly according to the first embodiment of the present invention.

[0029] Figure 11 This is a three-dimensional structural diagram of the folding frame of the first embodiment of this utility model.

[0030] Figure 12 This is a three-dimensional structural diagram of the unfolded frame of the second embodiment of this utility model. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0032] First embodiment: See Figures 1-11A seat folding mechanism includes a seat assembly 1 mounted on a vehicle frame, the seat assembly 1 being foldable and unfoldable, and also includes components mounted on the vehicle frame: Handle assembly 4, which can switch between a folded state and an unfolded state; Linkage assembly 3, which is used to synchronously connect seat assembly 1 and handle assembly 4; Locking assembly 5 is movably configured in the rotating open / closed position of handle assembly 4 and constrains the folding of handle assembly 4 in the locked position; The unlocking component 6 is movably mounted on the handle assembly 4 and is connected in a transmission manner to the lock assembly 5; When the handle assembly 4 switches from unfolded to folded, the unlocking component 6 triggers the locking component 5 to move to the unlocked position. The handle assembly 4 is folded under the push and drives the linkage assembly 3 to rotate, so as to realize the synchronous folding of the handle assembly 4 and the seat assembly 1. When the handle assembly 4 is unfolded, it unfolds synchronously with the seat assembly 1 through the linkage assembly 3.

[0033] The seat assembly 1 includes a front seat bar 103 and a rear seat bar 102 that are hinged together. The rear seat bar 102 is fixed to the vehicle frame. The front seat bar 103, the linkage assembly 3, and the handle assembly 4 are connected in sequence to form a linkage linkage mechanism that allows the seat assembly 1 and the handle assembly 4 to fold and unfold synchronously.

[0034] The linkage assembly 3 includes a first linkage 302 and a second linkage 301. The seat front rod 103, the first linkage 302, the second linkage 301 and the handle assembly 4 are connected in sequence to form a linkage structure, so that when the handle assembly 4 is unfolded or folded, the seat assembly 1 can move synchronously.

[0035] A fixing member 8 is provided between the seat cushion rear bar 102 and the vehicle frame. The fixing member 8 is used to maintain the relative position between the seat cushion rear bar 102 and the vehicle frame when the seat assembly 1 is unfolded.

[0036] The front seat post 103 is equipped with a fastener 2. One end of the fastener 2 is fixed to the front seat post 103, and the other end is connected to the first connecting rod 302. The fastener 2 and the front seat post 103 are welded together to form a single unit, or the fastener 2 is detachably mounted to the front seat post 103 using screws. When the screws are tightened, the fastener 2 is fixed to the front seat post 103. It should be noted that, in addition to screws, riveting can also be used for fixing.

[0037] In this technical solution, when the seat assembly 1 and handle assembly 4 switch from unfolded to folded, the locking assembly 5 is unlocked by the unlocking component 6. Simply pushing the handle assembly 4 causes the second link 301 to rotate via its hinged connection, which in turn rotates the link assembly 3 and the seat assembly 1, achieving synchronous folding of the handle assembly 4 and the seat assembly 1. The overall structure eliminates the need for multiple locking transmission components, significantly simplifying the structure, reducing the number of parts, and lowering manufacturing costs and assembly difficulty. Furthermore, the operation is simple, requiring only the operation of the unlocking component 6 and the pushing of the handle assembly 4, enhancing user convenience.

[0038] The seat assembly 1 includes a rotatable backrest rod 101, and a support member 7 is provided on the second link 301. The backrest rod 101 is supported on the support member 7 when the seat assembly 1 is unfolded. The backrest rod 101 is disengaged from the support member 7 during the folding of the handle assembly 4, and the backrest rod 101 rotates downward under the action of gravity.

[0039] When the seat assembly 1 is unfolded, the backrest rod 101 is supported on the support member 7 of the second link 301. The support member 7 provides stable support for the backrest rod 101, ensuring the stability of the backrest structure after the seat assembly 1 is unfolded and improving riding safety. When folded, the backrest rod 101 folds away from the support member 7 along with the handle assembly 4. Without the need for additional driving components, the backrest rod 101 can rotate downwards by its own weight, further simplifying the structure.

[0040] The support member 7 is provided with a support block, which extends toward one side of the support member 7. The backrest rod 101 is supported on the support block of the support member 7 when the seat assembly 1 is unfolded. The support member 7 is fixed to the inner side of the second connecting rod 301 by screws or welding.

[0041] The seat assembly 1 also includes a seat cushion rear bar 102, which is hinged to the backrest bar 101. A fixing member 8 is provided between the seat cushion rear bar 102 and the second connecting rod 301. The fixing member 8 is used to maintain the relative position between the seat cushion rear bar 102 and the second connecting rod 301 when the seat assembly 1 is unfolded.

[0042] When the seat assembly 1 is unfolded, the fastener 8 can maintain the relative position of the seat cushion rear bar 102 and the second link 301, preventing the seat cushion rear bar 102 from shifting during use, ensuring the load-bearing stability of the seat cushion rear bar 102, and thus improving the overall load-bearing reliability of the seat assembly 1.

[0043] The fastener 8 is bent, with its first end connected to the outer side of the rear rod 102 of the seat cushion and its second end connected to the inner side of the second connecting rod 301.

[0044] The seat front bar 103 and the fastener 2 are linked by the first link 302, the second link 301 and the handle assembly 4. When the seat assembly 1 and the handle assembly 4 switch from unfolded to folded, the locking component 5 of the handle assembly 4 is unlocked by the unlocking component 6 and pushes the handle assembly 4 towards the front of the frame. The handle assembly 4 folds and drives the second link 301 to rotate. The rotation of the second link 301 is transmitted to the seat front bar 103 through the first link 302. The seat front bar 103 is flipped by the upward force of the link assembly 3, so that the seat assembly 1 and the handle assembly 4 fold synchronously. After folding, the seat assembly 1 is smaller and easier to store. The linkage mechanism has a simple structure, does not require complex transmission components, and the parts are easy to process and assemble, reducing manufacturing costs.

[0045] The handle assembly 4 includes an upper push handle 401 and a lower push handle 402, and an upper joint 9 for installing the lock assembly 5 is provided between the upper push handle 401 and the lower push handle 402. The locking assembly 5 includes a driving member 501, a locking gear 502 and a spring 503. The unlocking member 6 is disposed on the upper push handle 401 and is connected to the driving member 501 in a transmission manner. The two ends of the spring 503 respectively abut against the locking gear 502 and the inner side of the upper joint 9. When the locking assembly 5 is locked, the locking gear 502 engages with the two inner sides of the upper joint 9. When the unlocking component 6 is operated, the driving component 501 is triggered to drive the locking gear 502 to move and compress the spring 503, so that the locking gear 502 disengages from one inner side of the upper joint 9, thereby unlocking.

[0046] The locking assembly 5 adopts a cooperative structure of drive component 501, locking gear 502 and spring 503, eliminating the need for multiple locking components, reducing the number of parts and simplifying the structure, thus reducing costs and assembly difficulty. When locked, the locking gear 502 meshes with the two inner sides of the upper joint 9. This double meshing enhances the locking strength of the handle assembly 4 after it is unfolded, preventing the handlebar from loosening and improving safety. When unlocked, the unlocking component 6 triggers the drive component 501 to drive the locking gear 502 to squeeze the spring 503 and disengage, making operation easier. The spring 503 can also push the locking gear 502 to reset after the entire frame is folded and unfolded, making it easy to relock after the entire frame is unfolded.

[0047] The unlocking component 6 is press-fitted onto the upper push handle 401, and the upper push handle 401 contains a transmission component. The first end of the transmission component is connected to the unlocking component 6, and the second end of the transmission component is connected to the driving component 501.

[0048] The unlocking component 6 adopts a press-type design and is set on the push handle 401, which conforms to the user's hand operation habits. The user does not need to find complicated operation points, but only needs to press to trigger unlocking, making the operation more convenient. The transmission component inside the push handle 401 can stably transmit the pressing force of the unlocking component 6 to the driving component 501. The transmission component has transmission pins at both ends, and the two transmission pins are connected to the unlocking component 6 and the driving component 501 respectively.

[0049] The transmission components of this technical solution can be ropes, steel cables, draw ropes, and chains, etc.

[0050] The driving component 501 is rotatably connected to the inner side of the upper joint 9. The driving component 501 is provided with a plurality of circumferentially spaced guide grooves 504, and the inner side of the upper joint 9 is provided with a plurality of circumferentially spaced helical teeth 901. Each helical tooth 901 is correspondingly matched with the guide groove 504. When the driving component 501 is triggered to rotate by the unlocking component 6, the driving component 501 moves axially within the upper joint 9 through the guide grooves 504 and the helical teeth 901. The upper joint 9 includes a first inner joint 903 and a first outer joint 904 that are rotatably connected. The inner sides of the first inner joint 903 and the first outer joint 904 are respectively provided with a plurality of circumferentially spaced tooth grooves 902. The locking gear 502 meshes with the tooth grooves 902 on both inner sides of the upper joint 9 when the locking assembly 5 is locked. The first inner joint 903 is fixedly connected to the upper push handle 401, and the first outer joint 904 is fixedly connected to the lower push handle 402.

[0051] One end of the first inner joint 903 is hinged to the second connecting rod 301.

[0052] The guide groove 504 of the drive component 501 and the inner helical tooth 901 of the upper joint 9 can convert the rotation of the drive component 501 into precise axial movement, ensuring that the locking gear 502 accurately disengages from / engages with the tooth groove 902 of the upper joint 9. The first inner joint 903 is fixedly connected to the upper push handle 401, and the first outer joint 904 is fixedly connected to the lower push handle 402. When the handle assembly 4 is folded / unfolded, the upper push handle 401 rotates with the rotation point of the upper joint 9 as the axis under the push, so that the upper push handle 401 moves closer to the lower push handle 402, and drives the second connecting rod 301 to rotate downward, so that the backrest rod 101 is disengaged from the support component 7. Under the action of gravity, the backrest rod 101 rotates downward along the rotational connection position between the backrest rod 101 and the seat cushion rear rod 102.

[0053] A folding vehicle includes a frame on which the aforementioned seat folding mechanism is provided; the frame also includes a foldable and unfoldable caster frame assembly 10, the lower parts of the handle assembly 4 and the second link 301 are respectively hinged to the caster frame assembly 10, and the seat assembly 1 is connected to the upper part of the caster frame assembly 10. During the folding or unfolding process of the handle assembly 4, the second link 301 drives the caster frame assembly 10 to rotate, so as to realize the synchronous folding and unfolding of the handle assembly 4, the seat assembly 1 and the caster frame assembly 10.

[0054] When the handle assembly 4 is folded / unfolded, it can directly drive the caster frame assembly 10 to rotate via the second link 301, realizing the synchronous movement of the handle assembly 4, seat assembly 1, and caster frame assembly 10. There is no need to operate the seat and caster frame separately, greatly reducing the operation steps and improving folding efficiency. There is no need to set an additional locking or drive mechanism for the caster frame assembly 10, simplifying the overall structure of the folding bike, reducing the number of parts, and lowering manufacturing costs and assembly difficulty. After folding synchronously, the overall size of the folding bike is smaller, making it easier to store and carry, and improving the practicality of the product.

[0055] The caster frame assembly 10 has a lower joint 11 on its upper part. The lower joint 11 includes a second inner joint 1101 and a second outer joint 1102 that are rotatably connected. The inner side of the second inner joint 1101 is fixedly connected to the rear section of the seat assembly 1, and the second outer joint 1102 is fixedly connected to the lower part of the handle assembly 4. The connection between the inner side of the second inner joint 1101 and the seat cushion rear rod 102 of the seat assembly 1 is a non-circular structure, which prevents the two from rotating. The side of the seat cushion rear rod 102 is provided with a fixed shaft 104 with a non-circular cross-section, and the inner side of the second inner joint 1101 is provided with a shaft cavity 1103 with a non-circular cross-section. The fixed shaft 104 and the shaft cavity 1103 are matched in shape, so that the second inner joint 1101 and the seat cushion rear rod 102 are fixedly connected.

[0056] The caster frame assembly 10 includes a rear caster frame 1001 and a front caster frame 1002; the rear caster frame 1001 is fixedly connected to the second inner joint 1101, and the front caster frame 1002 is hinged to the second inner joint 1101, so that the caster frame assembly 10 can be folded and unfolded.

[0057] The second inner joint 1101 and the second outer joint 1102 of the lower joint 11 cooperate to ensure the rotational coordination of the seat assembly 1, handle assembly 4 and caster frame assembly 10 after connection, avoid interference between components and improve the smoothness of synchronous folding / unfolding; the rear caster frame 1001 is fixedly connected to the second inner joint 1101 to ensure the stability of the caster frame assembly 10 after unfolding and to prevent the rear caster frame 1001 from shifting during driving; the front caster frame 1002 is hinged to the second inner joint 1101, so that the caster frame assembly 10 can be folded independently. With synchronous action, the folded caster frame assembly 10 can be closely close to the seat and armrest, further reducing the size of the folding vehicle and improving storage convenience.

[0058] A connector 12 is provided between the front caster frame 1002 and the second link 301. The connector 12 is used to maintain the relative position between the front caster frame 1002 and the second link 301 when the caster frame assembly 10 is unfolded.

[0059] When the caster frame assembly 10 is unfolded, the connector 12 can fix the relative position of the front caster frame 1002 and the second link 301, preventing the front caster frame 1002 from shaking or shifting while the folding bicycle is in motion, thus improving driving stability and safety. The connector 12 has a simple structure and does not require a complex locking transmission structure, so it will not increase the overall complexity and cost of the folding bicycle. Moreover, the connector 12 only plays a fixing role when unfolded and does not affect the folding action of the front caster frame 1002 when the handle assembly 4 drives the second link 301 to rotate.

[0060] The connector 12 is arc-shaped, and the first end of the connector 12 is connected to the inner side of the front caster frame 1002, and the second end of the connector 12 is connected to the outer side of the second connecting rod 301.

[0061] In this technical solution, the rotating connection (hinged connection) structure between the two components can be such that one component is directly riveted to the other component by a rivet, or one component has a slot, and the other component is embedded in the slot, and the two components are rotatably connected by a connecting shaft.

[0062] The rotational connection structure of the upper and lower joints is existing technology, namely, the inner and outer joints are provided with connecting shafts and connecting shaft holes, etc. These are common structures used by those skilled in the art, and will not be described in detail here.

[0063] Specifically: Press the unlocking part 6 on the push handle 401. The unlocking part 6 drives the drive part 501 to rotate through the transmission part. The guide groove 504 of the drive part 501 cooperates with the inner helical tooth 901 of the upper joint 9, so that the drive part 501 moves axially and pushes the locking gear 502 to squeeze the spring 503. The locking gear 502 disengages from the tooth groove 902 of the first inner joint 903, and the lock assembly 5 is unlocked.

[0064] Pushing the upper handle 401 to rotate relative to the lower handle 402 causes the lower handle 402 to drive the second link 301 to rotate around the hinge point with the handle assembly 4. When the second link 301 rotates, on the one hand, it pulls the seat front rod 103 to rotate through the link assembly 3; on the other hand, the support member 7 of the second link 301 disengages from the backrest rod 101, and the backrest rod 101 rotates downward under the action of gravity.

[0065] The lower part of the second link 301 drives the front caster 1002 of the caster frame assembly 10 to rotate. At the same time, the push handle 402 rotates around the second inner joint 1101 via the second outer joint 1102 of the lower joint 11, causing the front caster 1002 to move closer to the rear caster 1001, thus folding the caster frame assembly 10. Finally, the handle assembly 4, seat assembly 1, and caster frame assembly 10 are folded simultaneously to form a three-fold vehicle.

[0066] Second embodiment: See Figure 12One type of seat folding mechanism differs from the first embodiment in that the seat assembly 1 further includes a backrest rod 101, which is not connected to the seat cushion rear rod 102 and is mounted on the fabric cover. The backrest rod 101 is only mounted on the frame when the fabric cover is assembled with the frame.

[0067] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A seat folding mechanism, comprising a seat assembly (1) mounted on a vehicle frame, wherein the seat assembly (1) is foldable and unfoldable, characterized in that, Also includes those mounted on the chassis: The handle assembly (4) is capable of switching between a folded state and an unfolded state; Linkage assembly (3), which is used to synchronously connect seat assembly (1) and handle assembly (4); Lock assembly (5), which is movably set in the rotational opening and closing position of handle assembly (4) and constrains the folding of handle assembly (4) in the locked position; The unlocking component (6) is movably mounted on the handle assembly (4) and is connected in a transmission manner to the lock assembly (5); When the handle assembly (4) switches from unfolded to folded, the locking assembly (5) is triggered to move to the unlocked position by the unlocking component (6). The handle assembly (4) is folded under the push and drives the linkage assembly (3) to rotate, so as to realize the synchronous folding of the handle assembly (4) and the seat assembly (1). When the handle assembly (4) is unfolded, it is simultaneously unfolded with the seat assembly (1) through the linkage assembly (3).

2. The seat folding mechanism according to claim 1, characterized in that: The seat assembly (1) includes a front seat bar (103) and a rear seat bar (102) that are hinged together. The rear seat bar (102) is fixed to the frame. The front seat bar (103), the linkage assembly (3) and the handle assembly (4) are connected in sequence to form a linkage linkage mechanism that allows the seat assembly (1) and the handle assembly (4) to fold and unfold synchronously.

3. The seat folding mechanism according to claim 2, characterized in that: The linkage assembly (3) includes a first linkage (302) and a second linkage (301). The seat front rod (103), the first linkage (302), the second linkage (301) and the handle assembly (4) are connected in sequence to form a linkage structure, so that when the handle assembly (4) is unfolded or folded, the seat assembly (1) can move synchronously.

4. The seat folding mechanism according to claim 2, characterized in that: A fastener (8) is provided between the seat cushion rear bar (102) and the frame. The fastener (8) is used to maintain the relative position between the seat cushion rear bar (102) and the frame when the seat assembly (1) is unfolded. The seat assembly (1) also includes a backrest rod (101), which is mounted on the seat cushion rear rod (102) or on the fabric cover; The front rod (103) of the seat cushion is provided with a fastener (2), one end of which is fixed to the front rod (103) of the seat cushion, and the other end of which is connected to the first connecting rod (302).

5. The seat folding mechanism according to claim 1, characterized in that: The handle assembly (4) includes an upper push handle (401) and a lower push handle (402), and an upper joint (9) for installing a lock assembly (5) is provided between the upper push handle (401) and the lower push handle (402). The locking assembly (5) includes a driving member (501), a locking gear (502) and a spring (503). The unlocking member (6) is mounted on the upper push handle (401) and is connected to the driving member (501) in a transmission manner. The two ends of the spring (503) abut against the locking gear (502) and the inner side of the upper joint (9) respectively. When the locking assembly (5) is locked, the locking gear (502) engages with the two inner sides of the upper joint (9). When the unlocking component (6) is operated, the trigger drive component (501) drives the locking gear (502) to move and squeeze the spring (503) so that the locking gear (502) disengages from one inner side of the upper joint (9) and unlocks.

6. The seat folding mechanism according to claim 5, characterized in that: The unlocking component (6) is pressed onto the upper push handle (401), and the upper push handle (401) is provided with a transmission component. The first end of the transmission component is connected to the unlocking component (6), and the second end of the transmission component is connected to the driving component (501).

7. The seat folding mechanism according to claim 5, characterized in that: The driving component (501) is rotatably connected to the inner side of the upper joint (9). The driving component (501) is provided with a number of circumferentially spaced guide grooves (504), and the inner side of the upper joint (9) is provided with a number of circumferentially spaced helical teeth (901). Each helical tooth (901) is matched with the guide groove (504) one by one. When the driving component (501) is triggered to rotate by the unlocking component (6), the driving component (501) moves axially in the upper joint (9) through the guide groove (504) and the helical teeth (901). The upper joint (9) includes a first inner joint (903) and a first outer joint (904) rotatably connected. The inner sides of the first inner joint (903) and the first outer joint (904) are respectively provided with a plurality of circumferentially spaced tooth grooves (902). The locking gear (502) meshes with the tooth grooves (902) on both inner sides of the upper joint (9) when the locking assembly (5) is locked. The first inner joint (903) is fixedly connected to the upper push handle (401), and the first outer joint (904) is fixedly connected to the lower push handle (402); One end of the first inner joint (903) is hinged to one end of the connecting rod assembly (3).

8. A folding bicycle, comprising a frame, characterized in that: The frame is provided with a seat folding mechanism as described in any one of claims 1-7; the frame is also provided with a foldable and unfoldable caster frame assembly (10), the lower parts of the handle assembly (4) and the linkage assembly (3) are respectively connected to the caster frame assembly (10), and the seat assembly (1) is connected to the upper part of the caster frame assembly (10); During the folding or unfolding process of the handle assembly (4), the connecting rod assembly (3) drives the caster frame assembly (10) to rotate, so as to realize the synchronous folding and unfolding of the handle assembly (4), the seat assembly (1) and the caster frame assembly (10).

9. The folding bicycle according to claim 8, characterized in that: The caster frame assembly (10) is provided with a lower joint (11) on the upper part. The lower joint (11) includes a second inner joint (1101) and a second outer joint (1102) that are rotatably connected. The second inner joint (1101) is fixedly connected to the rear section of the seat assembly (1), the second outer joint (1102) is fixedly connected to the lower part of the handle assembly (4), and one end of the connecting rod assembly (3) is connected to the front section of the seat assembly (1). The caster frame assembly (10) includes a rear caster frame (1001) and a front caster frame (1002); the rear caster frame (1001) is fixedly connected to the second inner joint (1101), and the front caster frame (1002) is hinged to the second inner joint (1101) so that the caster frame assembly (10) can be folded and unfolded.

10. The folding vehicle according to claim 9, characterized in that: A connector (12) is provided between the front caster frame (1002) and the frame. The connector (12) is used to maintain the relative position between the front caster frame (1002) and the frame when the caster frame assembly (10) is unfolded.

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