A flip-type leg support frame mechanism and car seat

Abstract

The utility model belongs to the field of seat leg rests, and provides a flip-over leg rest frame mechanism and a car seat, including: a support frame, which is connected to the seat; a rotating assembly having a retracted state and a use state, and the rotating assembly is rotatably arranged on the support frame; a telescopic assembly, which is movably connected to the support frame, and the telescopic assembly includes a support frame having an initial position and a maximum expansion position, and the support frame is movably connected to the rotating assembly. Compared with the prior art, the utility model has the advantage that the support frame can move relative to the guide plate and away from the support frame while synchronously flipping, so as to reach the maximum expansion position to support the user's legs, the overall structure is relatively simple, the use of parts is reduced, the manufacturing cost is saved, and the phenomenon of frequent replacement caused by damage to parts is prevented. At the same time, the leg rest can be quickly extended to the maximum expansion position, which provides convenience for customers when using it, and is conducive to improving the customer's use experience.

Description

Technical Field

[0001] The utility model belongs to the field of seat leg supports, and in particular relates to a flip-over leg support frame mechanism and a car seat. Background Art

[0002] Car seats are an important part of riding a bike. With the improvement of living standards, people have higher and higher requirements for the comfort of vehicle seats. For most commercial vehicles, the seats are usually equipped with an adjustable leg support structure to provide support for the legs and improve the riding comfort of passengers.

[0003] Most of the existing leg rest structures are equipped with gears and racks on the pallet frame and the support frame, and rely on the mutual cooperation between the gears and the racks to achieve the extension and retraction when the pallet frame is flipped. However, this leg rest structure is not only relatively complex in overall structure, but also prone to damage of parts and components resulting in frequent replacement, which increases costs. It is also not conducive to achieving the synchronous extension of the leg rest to the maximum expanded position when flipping, which in turn affects the customer's user experience. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a flippable leg rest frame mechanism and a car seat.

[0005] The utility model solves the technical problem by adopting a technical solution of providing a flip-over leg support frame mechanism, which is used to be installed on a seat to support the legs, and comprises: a support frame connected to the seat;

[0006] A rotating assembly having a retracted state and a use state, wherein the rotating assembly is rotatably disposed on the support frame;

[0007] A telescopic assembly, movably connected to the support frame, the telescopic assembly comprising a support frame having an initial position and a maximum expansion position, the support frame being movably connected to the rotating assembly, and when the rotating assembly is switched from the contracted state to the use state, the support frame can slide relative to the rotating assembly to move away from the support frame;

[0008] A driving assembly is connected to the support frame, and a driving end of the driving assembly is hinged to the rotating assembly, so that when the rotating assembly rotates, it can drive the support frame to rotate synchronously;

[0009] When the rotating assembly is in the retracted state, the support frame in the initial position is close to the support frame and close to the seat to reserve space for the legs;

[0010] When the rotating assembly is rotated and switched to the use state, the support plate frame can move relative to the rotating assembly and away from the support frame when flipping synchronously, so that the support plate frame in the maximum unfolded position can support the legs.

[0011] In the above-mentioned flip-over leg support frame mechanism, the rotating assembly includes:

[0012] A rotating shaft, rotatably arranged on the supporting frame;

[0013] A driving block, one end of which is connected to the rotating shaft and the other end of which is movably hinged to the driving end of the driving assembly;

[0014] At least one guide plate is connected to the rotating shaft, and a guide block is connected to the support plate frame. The guide block is movably engaged in the guide plate, so that the support plate frame can reciprocate along the length direction of the guide plate when it is flipped.

[0015] In the above-mentioned flip-over leg support frame mechanism, the telescopic assembly also includes a connecting rod, a connecting portion is vertically arranged on the support frame, one end of the connecting rod is movably hinged on the support frame, and the other end is movably clamped to the connecting portion.

[0016] In the above-mentioned flip-over leg support frame mechanism, a guide hole is formed in the length direction of the guide plate, a snap-fitting groove is formed on the guide block, and the inner wall of the guide hole extends into the snap-fitting groove and is movably snap-fitted therewith.

[0017] In the above-mentioned flip-over leg support frame mechanism, the guide block comprises:

[0018] A first connecting block, which is tightly attached to the support plate frame, is provided with a fixing column and a buckle both penetrating the guide hole, a positioning hole is formed in the fixing column, and a clearance groove is formed at one end of the buckle;

[0019] A second connecting block, which is tightly attached to the guide plate and overlaps with the first connecting block, the second connecting block and the first connecting block together form the snap-fitting groove, and the second connecting block is provided with a through hole and a snap-fitting groove;

[0020] The buckle can pass through the buckle groove when the first connecting block and the second connecting block are respectively pressed against the guide plate, and when the locking screw passes through the through hole and the positioning hole and is connected in the support plate frame, the first connecting block and the second connecting block are fixed on the support plate frame.

[0021] In the above-mentioned flip-over leg support frame mechanism, the connecting part and the supporting frame are detachably connected with a fixed shaft, a connecting groove is formed in the fixed shaft, and connecting holes are provided at both ends of the connecting rod. The connecting holes are rotatably set in the connecting groove, and the connecting rod is prevented from being separated from the connecting groove by a retaining spring.

[0022] In the above-mentioned flip-over leg support frame mechanism, the driving assembly includes:

[0023] A mounting bracket, arranged on the supporting frame;

[0024] The driving member is connected in the mounting bracket, and the output end of the driving member is connected to a screw rod, and the end of the screw rod is movably hinged to the driving block, so that when the driving member is driven, it can drive the screw rod to move along its axial direction to realize the synchronous flipping of the driving block and the pallet frame.

[0025] In the above-mentioned flippable leg support frame mechanism, an arc portion is formed at the end of the driving block away from the rotating shaft, and the end of the screw rod is movably hinged to the arc portion.

[0026] In the above-mentioned flippable leg support frame mechanism, a reinforcing plate is further connected between the two guide plates to allow the support plate frame to reciprocate along the length direction of the guide plates.

[0027] The utility model adopts a technical solution to solve the technical problem, and also provides a car seat, which comprises a flippable leg support frame mechanism.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] (1) The utility model provides a flip-over leg rest frame mechanism and a car seat, through the movable clamping connection between the support frame and the rotating assembly, so that when the driving assembly drives the rotating shaft to rotate, the support frame can be flipped synchronously and move relative to the guide plate and away from the support frame to reach the maximum expanded position to support the user's legs. Therefore, the overall structure of the leg rest frame mechanism is relatively simple, which greatly reduces the use of parts and components, saves manufacturing costs, and effectively prevents the phenomenon of frequent replacement of parts and components due to damage. At the same time, the leg rest structure can quickly realize the extension of the leg rest to the maximum expanded position when the driving member drives the screw rod to move, which provides convenience for customers when using it and is conducive to improving the customer's user experience.

[0030] (2) The engaging groove formed by the first connecting block and the second connecting block is movably engaged with the support plate frame, which plays a guiding and limiting role in the movement of the support plate frame when switching from the initial position to the maximum expanded position, effectively improving the stability of the leg support structure and extending its service life.

[0031] (3) This solution adopts a single-link design, which greatly saves the parts used when the pallet frame is extended or retracted, reducing manufacturing costs. At the same time, an arc portion is formed at the end of the drive block, which is beneficial to prevent the drive member from getting stuck when driving. It also shortens the drive stroke of the screw rod, thereby saving the time required for the pallet frame to switch from the initial position to the maximum expansion position, providing a guarantee for customer convenience when using it. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram when the rotating assembly is in a retracted state and the pallet frame is in an initial position;

[0033] Figure 2 This is the installation structure view between the guide plate and the support plate frame;

[0034] Figure 3 is an exploded view between the first connecting block, the second connecting block and the guide plate;

[0035] Figure 4 It is a schematic diagram of the installation structure of the drive component;

[0036] Figure 5 It is an exploded view between the connecting rod and the fixed shaft;

[0037] Figure 6 It is a structural schematic diagram when the rotating assembly is in use and the pallet frame is in the maximum expanded position.

[0038] In the figure, 1. support frame;

[0039] 2. Rotating assembly; 20. Rotating shaft; 21. Driving block; 210. Arc portion; 22. Guide plate; 220. Guide hole; 23. Reinforcement plate;

[0040] 3. Telescopic assembly; 30. Support plate frame; 300. Connecting part; 31. Guide block; 310. Engaging groove; 311. First connecting block; 311a. Fixed column; 311b. Positioning hole; 311c. Buckle; 311d. Displacement groove; 312. Second connecting block; 312a. Through hole; 312b. Buckle groove; 312c. Locking screw; 32. Connecting rod; 320. Fixed shaft; 320a. Connecting groove; 321. Connecting hole;

[0041] 4. Driving assembly; 40. Mounting bracket; 41. Driving member; 42. Screw rod. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] like Figure 1 As shown, in the present solution, a reversible leg rest frame mechanism for car seats is mainly described in detail, but the reversible leg rest frame mechanism is not limited to being used in car seats, but can also be applied to other seats, such as business class seats on high-speed trains.

[0044] like Figures 1 to 6 As shown, a reversible leg support frame mechanism is used to be installed on a seat to support the legs, comprising: a support frame 1, which is connected to the seat; a rotating component 2 having a retracted state and a use state, the rotating component 2 is rotatably set on the support frame 1; a telescopic component 3, which is movably connected to the support frame 1, the telescopic component 3 includes a support plate frame 30 with an initial position and a maximum expansion position, the support plate frame 30 is movably connected to the rotating component 2, and when the rotating component 2 is switched from the retracted state to the use state, the support plate frame 30 can slide relative to the rotating component 2 by a distance away from the support frame 1; a driving component 4 is connected to the support frame 1, and a driving end of the driving component 4 is hinged to the rotating component 2, so that when the rotating component 2 rotates, it can drive the pallet frame 30 to rotate synchronously; when the rotating component 2 is in a retracted state, the pallet frame 30 in the initial position is close to the support frame 1 and close to the seat, so as to reserve space for the legs; when the rotating component 2 is rotated and switched to the use state, the pallet frame 30 can move relative to the rotating component 2 and away from the support frame 1 when synchronously flipped, so as to provide support for the legs for the pallet frame 30 in the maximum expanded position.

[0045] This solution is mainly to achieve the contraction and extension of the support plate frame 30 during use. Specifically, when the support plate frame 30 is in Figure 1 When the rotating assembly 2 is in the retracted state, the support frame 30 is close to the back of the seat, which greatly saves the space in the car. When the passenger needs to use the leg rest, the driving assembly 4 can drive the rotating assembly 2 to move along the Figure 1 The support plate frame 30 is rotated in the counterclockwise direction. Since the support plate frame 30 is movably connected with the rotating assembly 2, the support plate frame 30 can be driven to turn synchronously while the rotating assembly 2 rotates. At the same time, the support plate frame 30 can slide relative to the rotating assembly 2 during the turning process, and then the support plate frame 30 can be turned from Figure 1 Location launched to Figure 5 The state shown (i.e. the rotating assembly 2 is in use and the support frame 30 is in the maximum expanded position) is provided for the user to place his legs on the support frame 30. Figure 5It can be seen that the overall structure of the leg rest frame mechanism is relatively simple, which greatly reduces the use of parts and components, saves manufacturing costs, and effectively prevents the frequent replacement of parts and components due to damage. At the same time, the leg rest structure can quickly extend the leg rest to the maximum expanded position when the rotating component 2 is flipped, which provides convenience for customers to use and shortens the time required for users to wait for the pallet frame 30 to switch to the maximum expanded position, thereby improving the customer's user experience.

[0046] Preferably, a leg support foam pad (not shown in the figure) is also provided on the support plate frame 30 in the present embodiment to further enhance the comfort of the user when placing the legs on the support plate frame 30 .

[0047] The rotating assembly 2 includes: a rotating shaft 20, which is rotatably set on the support frame 1; a driving block 21, one end of which is connected to the rotating shaft 20, and the other end is movably hinged to the driving end of the driving assembly 4; at least one guide plate 22, which is connected to the rotating shaft 20, and a guide block 31 is connected to the support frame 30, and the guide block 31 is movably clamped in the guide plate 22, so that the support frame 30 can move back and forth along the length direction of the guide plate 22 when it is flipped.

[0048] like Figure 2 and Figure 4 As shown, when the driving assembly 4 drives the driving block 21 to rotate, since the end of the driving block 21 away from the driving assembly 4 is connected to the rotating shaft 20, the rotating shaft 20 can rotate synchronously with the driving block 21, and with the rotation of the rotating shaft 20, the guide plate 22 is driven to perform a flipping action synchronously. It is worth noting that the rotation centers of the driving block 21, the rotating shaft 20 and the guide plate 22 are all the axis of the rotating shaft 20, so as to ensure that the support plate frame 30 is pushed to reciprocate along the length direction of the guide plate 22 during the flipping process, thereby realizing that the support plate frame 30 is in the initial position ( Figure 1 shown) and maximum expanded position ( Figure 6 At the same time, the structure also realizes the flipping action of the guide plate 22 while pushing the support plate frame 30 to the Figure 6 The maximum unfolded position shown has a relatively smooth movement, which also shortens the time required for customers to wait for the support frame 30 to switch to the maximum unfolded position during use, thereby improving the customer's user experience.

[0049] It should be noted that the driving block 21 and the rotating shaft 20, as well as the rotating shaft 20 and the guide plate 22 in the present solution can be fixed together by welding (such as laser welding), thereby avoiding instability during manual assembly and ensuring that the driving block 21, the rotating shaft 20 and the guide plate 22 can rotate synchronously under the drive of the driving assembly 4, so that the support plate frame 30 that is movably engaged with the guide plate 22 can be quickly pushed out to the maximum expanded position, thereby improving the stability of the leg support structure and the continuity of the expansion action.

[0050] The telescopic assembly 3 further includes a connecting rod 32 . A connecting portion 300 is vertically arranged on the support plate frame 30 . One end of the connecting rod 32 is movably hinged on the support frame 1 , and the other end is movably clamped on the connecting portion 300 .

[0051] like Figure 1 , Figure 5 as well as Figure 6 As shown, the present solution adopts a single connecting rod 32 structure design, which not only reduces the use of parts, but also enables the support frame 30 to be quickly pushed out from the initial position to the Figure 5 The connecting portion 300 provides convenience for the installation of the connecting rod 32 on the one hand, and effectively prevents the support frame 30 from getting stuck when it is turned over and away from the support frame 1 on the other hand, thereby improving the smoothness and stability of the leg support structure during operation. Therefore, when the support frame 30 relies on the rotation force of the guide plate 22 to turn over, the connecting rod 32 is pulled around the connection between it and the support frame 1 to turn over, and the support frame 30 is pushed out along the length direction of the guide plate 22 to the Figure 6 Maximum expanded position shown.

[0052] A fixed shaft 320 is detachably connected to the connecting portion 300 and the supporting frame 1, a connecting groove 320a is formed in the fixed shaft 320, and connecting holes 321 are provided at both ends of the connecting rod 32. The connecting hole 321 is rotatably set in the connecting groove 320a, and a retaining spring is used to prevent the connecting rod 32 from detaching from the connecting groove 320a.

[0053] Further, if Figure 5 As shown, in order to facilitate the installation and removal of the connecting rod 32, the present solution is provided with a detachable fixed shaft 320 on the support frame 1 and the connecting portion 300, and the connecting hole 321 on the connecting rod 32 is rotated in the connecting groove 320a set on the fixed shaft 320, thereby realizing that the connecting rod 32 is rotated around the connection between the connecting rod 32 and the support frame 1 when the support frame 30 is turned over, ensuring that the support frame 30 can be smoothly extended to Figure 6 Maximum expanded position shown.

[0054] Preferably, when the connecting rod 32 is connected to the fixed shaft 320, the present solution can further limit it by a retaining spring, thereby effectively preventing the connecting rod 32 from being separated from the fixed shaft 320 during frequent rotation, thereby improving the overall stability of the leg support structure and providing a guarantee for smoothness during use. It should be noted that the retaining spring is also called a retaining ring or a buckle, which is a fastener, and its main function is to be installed in the shaft groove or hole groove of a machine or equipment to prevent the parts on the shaft or hole from axial movement. In the above-mentioned rotating shaft 20, retaining springs (not shown in the figure) can also be provided at both ends to ensure that the rotating shaft 20 will only rotate in the radial direction on the support frame 1, and will not cause displacement in the axial direction. Its structure and principle are the same as those described above, and will not be repeated here.

[0055] A guide hole 220 is formed in the length direction of the guide plate 22 , and a clamping groove 310 is formed on the guide block 31 . The inner wall of the guide hole 220 extends into the clamping groove 310 and is movably clamped therewith.

[0056] For the movable connection between the guide plate 22 and the support plate frame 30, refer to Figure 2 and Figure 3 The guide block 31 is detachably connected to the support plate frame 30, and the engaging groove 310 on the guide block 31 is movably engaged with the guide hole 220 on the guide plate 22, which, on the one hand, limits the distance between the guide plate 22 and the support plate frame 30, and on the other hand, effectively guides the support plate frame 30 to slide in the guide hole 220 by relying on the guide block 31, thereby moving the support plate frame 30 from Figure 1 The status shown is pushed to Figure 6 In the state shown, the overall structure is simple, while also ensuring the smoothness and stability of the support plate frame 30 when it is pushed out or retracted.

[0057] The guide block 31 includes: a first connection block 311, which is tightly attached to the support plate frame 30, and the first connection block 311 is provided with a fixing column 311a and a buckle 311c, both of which penetrate the guide hole 220, and a positioning hole 311b is formed in the fixing column 311a, and a clearance groove 311d is formed at one end of the buckle 311c; a second connection block 312, which is tightly attached to the guide plate 22 and overlaps with the first connection block 311, and the second connection block 312 and the first connection block 311 are arranged A snap-fit ​​groove 310 is formed together, and a through hole 312a and a snap groove 312b are provided on the second connecting block 312; the snap 311c can pass through the snap groove 312b when the first connecting block 311 and the second connecting block 312 are respectively pressed against the guide plate 22, and when the locking screw 312c passes through the through hole 312a and the positioning hole 311b and is connected in the support plate frame 30, the first connecting block 311 and the second connecting block 312 are fixed on the support plate frame 30.

[0058] Further, if Figure 2 and Figure 3 As shown, the guide block 31 in this solution is composed of a first connecting block 311 and a second connecting block 312, wherein the first connecting block 311 is located between the guide plate 22 and the support plate frame 30, and the fixing column 311a and the buckle 311c on the first connecting block 311 can pass through the guide hole 220 on the guide plate 22. Figure 3 When the second connecting block 312 is in the position shown in the figure, the worker can move the second connecting block 312 closer to the inside of the guide plate 22 and overlap the first connecting block 311 when they are close to each other (that is, the first connecting block 311 and the second connecting block 312 are aligned and placed). For this reason, the through hole 312a on the second connecting block 312 can be movably sleeved on the fixing column 311a, which plays a guiding and limiting effect during installation; and the buckle 311c is also pressed closer to the first connecting block 311 as the second connecting block 312 is pressed and the buckle 311c is in the buckle groove 312b, and finally To achieve the installation connection between the first connecting block 311 and the second connecting block 312, it is worth mentioning that the cooperation between the buckle 311c and the buckle groove 312b can only play a pre-connection effect. The locking screw 312c is mainly passed through the through hole 312a, the positioning hole 311b and threadedly connected in the support plate frame 30 to ensure the stability between the first connecting block 311 and the second connecting block 312, and effectively avoid relative displacement between the two and affect the smoothness and stability of the support plate frame 30 when switching to the maximum expanded position.

[0059] Preferably, precisely because the first connecting block 311 is located between the guide plate 22 and the pallet frame 30 and they are both movably and tightly arranged, there is always a distance of the thickness of the first connecting block 311 between the guide plate 22 and the pallet frame 30, which also provides a guarantee for the smoothness of the guide plate 22 when rotating with the rotating shaft 20, and effectively prevents the large friction force between the guide plate 22 and the pallet frame 30 from affecting the smoothness of the pallet frame 30 when sliding relative to the guide plate 22.

[0060] The driving assembly 4 includes: a mounting bracket 40, which is arranged on the support frame 1; a driving member 41, which is connected in the mounting bracket 40, and the output end of the driving member 41 is connected to a screw rod 42, and the end of the screw rod 42 is movably hinged to the driving block 21, so that when the driving member 41 is driven, it can drive the screw rod 42 to move along its axial direction to realize the synchronous flipping of the driving block 21 and the pallet frame 30.

[0061] Specifically, Figure 4 and Figure 6 As shown, the driving member 41 in this solution is set as a single motor, and the output end of the motor is connected to the screw rod 42, so that when the motor is in motion, the output end of the motor drives the screw rod 42 to move, and then the driving block 21, the rotating shaft 20 and the guide plate 22 are pushed to turn over synchronously, so as to realize the synchronous push to the support plate frame 30 when turning over. Figure 6 Maximum expanded position shown.

[0062] Further, the end of the driving block 21 in this embodiment away from the rotating shaft 20 is formed with an arc portion 210, and the end of the screw rod 42 is movably hinged to the arc portion 210. Figure 6 The design of the arc portion 210 can, on the one hand, avoid the jamming phenomenon between the screw rod 42 and the driving block 21 when the screw rod 42 moves, thereby ensuring the smoothness of the sliding of the support plate frame 30 relative to the guide plate 22. On the other hand, it also reduces the stroke required for the screw rod 42 to move, that is, after a relatively short displacement of the screw rod 42, the arc portion 210 can be used to accurately push the support plate frame 30 to the maximum expanded position.

[0063] Preferably, if Figure 6 As shown, because the driving block 21, the rotating shaft 20, and the guide plate 22 perform a turning action synchronously, the screw rod 42 pushes the driving block 21 to turn to Figure 6 When the support plate frame 30 is in the maximum extended position shown in the figure, the support plate frame 30 is mainly locked in the maximum extended position by the screw rod 42. The motor cooperates with the self-locking force of the screw rod 42 to ensure that the support plate frame 30 is in the maximum extended position to a great extent. Figure 6 Stability in the state shown.

[0064] A reinforcing plate 23 is also connected between the two guide plates 22 to allow the support plate frame 30 to reciprocate along the length direction of the guide plates 22 .

[0065] The design of the reinforcing plate 23 ensures the stability between the two guide plates 22, so that the support plate frame 30 Figure 6 In the state shown, it can be in a horizontal posture, and the reinforcing plate 23 also limits the distance between the two guide plates 22, effectively avoiding the jamming phenomenon when the support plate frame 30 slides relative to the guide plate 22 and reducing the operating force.

[0066] It should be noted that the driving member 41 in this solution can be a stepping motor, a servo motor or other driving devices.

[0067] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0068] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A reversible leg support frame mechanism, used for installation on a seat to provide support for the legs, characterized in that: include: a support frame connected to the seat; A rotating assembly having a retracted state and a use state, wherein the rotating assembly is rotatably disposed on the support frame; A telescopic assembly, movably connected to the support frame, the telescopic assembly comprising a support frame having an initial position and a maximum expansion position, the support frame being movably connected to the rotating assembly, and when the rotating assembly is switched from the contracted state to the use state, the support frame can slide relative to the rotating assembly to move away from the support frame; A driving assembly is connected to the support frame, and a driving end of the driving assembly is hinged to the rotating assembly, so that when the rotating assembly rotates, it can drive the support frame to rotate synchronously; When the rotating assembly is in the retracted state, the support frame in the initial position is close to the support frame and close to the seat to reserve space for the legs; When the rotating assembly is rotated and switched to the use state, the support plate frame can move relative to the rotating assembly and away from the support frame when flipping synchronously, so that the support plate frame in the maximum unfolded position can support the legs.

2. A reversible leg support frame mechanism according to claim 1, characterized in that: The rotating assembly comprises: A rotating shaft, rotatably arranged on the supporting frame; A driving block, one end of which is connected to the rotating shaft and the other end of which is movably hinged to the driving end of the driving assembly; At least one guide plate is connected to the rotating shaft, and a guide block is connected to the support plate frame. The guide block is movably engaged in the guide plate, so that the support plate frame can reciprocate along the length direction of the guide plate when it is flipped.

3. The flip-over leg support frame structure according to claim 1, characterized in that: The telescopic assembly also includes a connecting rod. A connecting portion is vertically arranged on the support plate frame. One end of the connecting rod is movably hinged on the support frame, and the other end is movably clamped on the connecting portion.

4. The flip-over leg support frame structure according to claim 2, characterized in that: A guide hole is formed in the length direction of the guide plate, a clamping groove is formed on the guide block, and the inner wall of the guide hole extends into the clamping groove and is movably clamped therewith.

5. The flip-over leg support frame mechanism according to claim 4, characterized in that: The guide block comprises: A first connecting block, which is tightly attached to the support plate frame, is provided with a fixing column and a buckle both penetrating the guide hole, a positioning hole is formed in the fixing column, and a clearance groove is formed at one end of the buckle; A second connecting block, which is tightly attached to the guide plate and overlaps with the first connecting block, the second connecting block and the first connecting block together form the snap-fitting groove, and the second connecting block is provided with a through hole and a snap-fitting groove; The buckle can pass through the buckle groove when the first connecting block and the second connecting block are respectively pressed against the guide plate, and when the locking screw passes through the through hole and the positioning hole and is connected in the support plate frame, the first connecting block and the second connecting block are fixed on the support plate frame.

6. The flip-over leg support frame structure according to claim 3, characterized in that: The connecting portion and the supporting frame are detachably connected with a fixed shaft, a connecting groove is formed in the fixed shaft, connecting holes are provided at both ends of the connecting rod, the connecting holes are rotatably arranged in the connecting groove, and a retaining spring is used to prevent the connecting rod from being separated from the connecting groove.

7. The flip-over leg support frame structure according to claim 2, characterized in that: The drive assembly comprises: A mounting bracket, arranged on the supporting frame; The driving member is connected in the mounting bracket, and the output end of the driving member is connected to a screw rod, and the end of the screw rod is movably hinged to the driving block, so that when the driving member is driven, the screw rod can be driven to move along its axial direction to realize the synchronous flipping of the driving block and the pallet frame.

8. The flip-over leg support frame structure according to claim 7, characterized in that: An arc portion is formed at the end of the driving block away from the rotating shaft, and the end of the screw rod is movably hinged to the arc portion.

9. The flip-over leg support frame structure according to claim 2, characterized in that: A reinforcing plate is also connected between the two guide plates to allow the support plate frame to reciprocate along the length direction of the guide plates.

10. A car seat, characterized in that: A reversible leg support frame mechanism comprising the one described in any one of claims 1-9.

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