Frame and buggy

Abstract

A user controls a push rod assembly to rotate relative to a lower vehicle frame body so that the push rod assembly can be correspondingly in a pushing use state or a trailer use state, namely the push rod assembly is correspondingly linked with an unlocking action of a wheel assembly locking mechanism through a wheel assembly linkage mechanism; therefore, a user does not need to additionally operate the wheel assembly locking mechanism, corresponding actions of the push rod assembly and the wheel assembly can be achieved only through one operation action, and the wheel assembly locking mechanism has the advantages of being convenient to use and reasonable in design.

Description

Technical Field

[0001] The utility model relates to a frame and a baby carriage.

Background Art

[0002] In order to prevent the vehicle from rolling, when the frame is in a parking state, the wheels need to be locked for braking. In the existing frame structures, a pedal braking device is usually provided on the rear footrest or between the two rear footrests. When the frame is parked, the user can step on the brake pedal of the pedal braking device; in addition, there are also some frames with a handbrake device provided on the push rod or the handle. When the frame is parked, the user can press or pull the handbrake switch of the handbrake device.

[0003] However, the common point of the above two solutions is that additional operation by the user is required during parking to achieve braking and meet the requirements of safe parking. In actual use, people are prone to forgetting to brake and lock the wheels when parking is needed; therefore, there are problems of inconvenient use and potential safety hazards.

[0004] Therefore, the present utility model is studied and proposed in view of the above problems.

Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a frame and a baby carriage. The user controls the push rod assembly to rotate relative to the lower frame body so that it is in a pushing use state or a towing use state accordingly. That is, the push rod assembly drives the wheel assembly locking mechanism to unlock through the wheel assembly linkage mechanism, and then releases the locking state of the wheel assembly relative to the lower frame body. Therefore, the user does not need to additionally operate the wheel assembly locking mechanism. For this reason, the present utility model can realize the corresponding actions of the push rod assembly and the wheel assembly with only one operation action, and has the characteristics of convenient use and reasonable design.

[0006] A frame of the utility model includes:

[0007] A lower frame body 1, and a plurality of groups of wheel assemblies 2 are connected to the lower frame body 1;

[0008] A wheel assembly locking mechanism 3, which is located between the lower frame body 1 and the wheel assembly 2 and is used to lock at least one group of wheel assemblies 2 relative to the lower frame body 1;

[0009] A push rod assembly 4, the lower end of which is rotatably connected to the lower frame body 1, and the push rod assembly 4 has a pushing use state and / or a towing use state;

[0010] A push rod locking mechanism 5, which is located between the push rod assembly 4 and the lower frame body 1 and is used to lock the push rod assembly 4 relative to the lower frame body 1;

[0011] The push rod unlocking mechanism 6 is arranged on the push rod assembly 4 and is used to link the unlocking action of the push rod locking mechanism 5, thereby unlocking the locked state of the push rod assembly 4 relative to the lower frame body 1;

[0012] The wheel assembly linkage mechanism 7 is arranged between the push rod assembly 4 and the lower frame body 1 and is used to link the unlocking action of the wheel assembly locking mechanism 3 when the push rod assembly 4 is in the pushing use state or the towing use state, thereby releasing the locked state of the wheel assembly 2 relative to the lower frame body 1.

[0013] As described above, for a frame, the push rod assembly 4 further has a non-pushing / towing use state; the wheel assembly linkage mechanism 7 is also configured to cancel the unlocking action of the wheel assembly locking mechanism 3 when the push rod assembly 4 is in the non-pushing / towing use state, so that the wheel assembly locking mechanism 3 locks the wheel assembly 2 relative to the lower frame body 1; or, the wheel assembly linkage mechanism 7 is also configured to link the unlocking action of the wheel assembly locking mechanism 3 when the push rod assembly 4 is in the non-pushing / towing use state, thereby releasing the locked state of the wheel assembly 2 relative to the lower frame body 1.

[0014] As described above, for a frame, the push rod assembly 4 further has a lifting use state, and the wheel assembly linkage mechanism 7 is also configured to cancel the unlocking action of the wheel assembly locking mechanism 3 when the push rod assembly 4 is in the lifting use state, so that the wheel assembly locking mechanism 3 locks the wheel assembly 2 relative to the lower frame body 1.

[0015] As described above, for a frame, the lower frame body 1 includes a front foot rod 11 and a rear foot rod 12, and the upper end of the front foot rod 11 is connected to the upper end of the rear foot rod 12; the wheel assembly 2 includes a front wheel set 21 connected to the lower end of the front foot rod 11 and a rear wheel set 22 connected to the lower end of the rear foot rod 12; the wheel assembly locking mechanism 3 is located between the rear foot rod 12 and the rear wheel set 22 and is used to lock the rear wheel set 22 relative to the rear foot rod 12; the lower end of the push rod assembly 4 is rotatably connected to the upper end of the front foot rod 11 or the upper end of the rear foot rod 12.

[0016] As described above, for a frame, the push rod locking mechanism 5 is located between the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12; the push rod locking mechanism 5 includes a push rod locking groove respectively arranged at the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12, and a push rod locking gear axially slidably arranged between the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12 and capable of simultaneously engaging into the push rod locking grooves at the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12. A push rod locking elastic member for driving the push rod locking gear to simultaneously engage into the push rod locking grooves at the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12 is arranged between the push rod locking gear and the upper end of the rear foot rod 12; the push rod locking gear is configured to be linked to perform a corresponding unlocking action by the push rod unlocking mechanism 6, thereby unlocking the locked state of the push rod assembly 4 relative to the rear foot rod 12.

[0017] As described above, a frame, the wheel assembly linkage mechanism 7 includes a wheel assembly linkage pin 71 movably arranged on the rear foot rod 12, and a first linkage unlocking part 72 and a second linkage unlocking part 73 both arranged at the lower end of the push rod assembly 4 and capable of being linked and cooperating with the wheel assembly linkage pin 71; the wheel assembly linkage mechanism 7 further includes a first linkage locking part 74 arranged at the lower end of the push rod assembly 4 and located between the first linkage unlocking part 72 and the second linkage unlocking part 73; when the push rod assembly 4 is in the pushing and using state, the wheel assembly linkage pin 71 cooperates with the first linkage unlocking part 72; when the push rod assembly 4 is in the towing and using state, the wheel assembly linkage pin 71 cooperates with the second linkage unlocking part 73; when the wheel assembly linkage pin 71 cooperates with the first linkage locking part 74, the wheel assembly linkage pin 71 correspondingly links the wheel assembly locking mechanism 3 to lock the corresponding wheel assembly 2 relative to the lower frame body 1.

[0018] As described above, a frame, the first linkage unlocking part 72 and the second linkage unlocking part 73 are arranged at the lower end of the push rod assembly 4 at a position close to or far from the rotation axis between the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12, and correspondingly, the first linkage locking part 74 is arranged at the lower end of the push rod assembly 4 at a position close to or far from the rotation axis between the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12.

[0019] As described above, a frame, the first linkage unlocking part 72 and the second linkage unlocking part 73 are both unlocking convex parts arranged at the lower end of the push rod assembly 4, the first linkage locking part 74 is a locking concave part arranged at the lower end of the push rod assembly 4, and a linkage inclined wall is arranged between the unlocking concave part and the unlocking convex part; or, the first linkage unlocking part 72 and the second linkage unlocking part 73 are both unlocking concave parts arranged at the lower end of the push rod assembly 4, the first linkage locking part 74 is a locking convex part arranged at the lower end of the push rod assembly 4, and a linkage inclined wall is arranged between the unlocking concave part and the locking convex part.

[0020] As described above, a frame, the wheel assembly locking mechanism 3 includes a wheel assembly locking groove 31 arranged on the rear wheel set 22 and a wheel assembly sliding block 32 slidably arranged on the rear foot rod 12, a wheel assembly locking pin 33 capable of being inserted into the wheel assembly locking groove 31 is arranged on the wheel assembly sliding block 32, and a sliding block resetting part for driving the wheel assembly sliding block 32 to elastically reset is arranged between the wheel assembly sliding block 32 and the rear foot rod 12; the wheel assembly sliding block 32 is directly or indirectly connected to the wheel assembly linkage pin 71.

[0021] The present invention also provides a children's vehicle, including a frame as described above and a seat arranged on the frame.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. When the present utility model is in use, the user controls the push rod assembly to rotate relative to the lower vehicle frame main body so that it is in the corresponding pushing use state or towing use state. During the rotation process of the push rod assembly, the push rod assembly drives the wheel assembly locking mechanism to unlock through the wheel assembly linkage mechanism, thereby releasing the locking state of the wheel assembly relative to the lower vehicle frame main body. Therefore, the user does not need to operate the wheel assembly locking mechanism additionally. For this reason, the present utility model can realize the corresponding actions of the push rod assembly and the wheel assembly with only one operation action, which has the characteristics of convenient use and reasonable design.

[0024] 2. When the push rod assembly is in the non-pushing / towing use state, the present utility model cancels the unlocking action of the wheel assembly locking mechanism, so that the wheel assembly locking mechanism locks the wheel assembly relative to the lower vehicle frame main body, which can ensure the stable locking of the vehicle frame in the non-pushing / towing use state and guarantee the safe and reliable use.

Description of the Drawings

[0025] The following further describes in detail the specific implementation manners of the present utility model with reference to the drawings, where:

[0026] Figure 1 is a perspective view of Embodiment 1 of the present utility model.

[0027] Figure 2 is a side view of Embodiment 1 of the present utility model in the pushing use state.

[0028] Figure 3 is a side view of Embodiment 1 of the present utility model in the lifting use state.

[0029] Figure 4 is a side view of Embodiment 1 of the present utility model in the towing use state.

[0030] Figure 5 is a schematic structural view of the wheel assembly linkage mechanism and the wheel assembly locking mechanism in Embodiment 1 of the present utility model.

[0031] Figure 6 is a schematic structural view of the wheel assembly linkage mechanism in Embodiment 1 of the present utility model.

[0032] Figure 7 is a schematic structural view of the wheel assembly linkage mechanism in Embodiment 2 of the present utility model (one).

[0033] Figure 8 is a schematic structural view of the wheel assembly linkage mechanism in Embodiment 2 of the present utility model (two).

[0034] Figure 9 is a schematic structural view of the wheel assembly linkage mechanism in Embodiment 3 of the present utility model.

Specific Embodiment Manner

[0035] The embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

[0036] Embodiment 1:

[0037] As Figures 1-6 shown, a frame of the present utility model includes:

[0038] A lower frame body 1, and a plurality of sets of wheel assemblies 2 are connected to the lower frame body 1;

[0039] A wheel assembly locking mechanism 3, which is located between the lower frame body 1 and the wheel assembly 2 and is used to lock at least one set of wheel assemblies 2 relative to the lower frame body 1;

[0040] A push rod assembly 4, the lower end of the push rod assembly 4 is rotatably connected to the lower frame body 1, and the push rod assembly 4 has a pushing use state and / or a towing use state;

[0041] A push rod locking mechanism 5, which is located between the push rod assembly 4 and the lower frame body 1 and is used to lock the push rod assembly 4 relative to the lower frame body 1;

[0042] A push rod unlocking mechanism 6, which is arranged on the push rod assembly 4 and is used to link the unlocking action of the push rod locking mechanism 5, thereby unlocking the locked state of the push rod assembly 4 relative to the lower frame body 1;

[0043] A wheel assembly linkage mechanism 7, which is arranged between the push rod assembly 4 and the lower frame body 1 and is used to link the unlocking action of the wheel assembly locking mechanism 3 when the push rod assembly 4 is in the pushing use state or the towing use state, thereby releasing the locked state of the wheel assembly 2 relative to the lower frame body 1. When the present utility model is in use, the user controls the push rod assembly to rotate relative to the lower frame body so that it is in the pushing use state or the towing use state accordingly. During the rotation of the push rod assembly, the push rod assembly drives the wheel assembly locking mechanism to unlock through the wheel assembly linkage mechanism, thereby releasing the locked state of the wheel assembly relative to the lower frame body. Therefore, the user does not need to operate the wheel assembly locking mechanism additionally. For this reason, the present utility model can realize the corresponding actions of the push rod assembly and the wheel assembly with only one operation action, and has the characteristics of convenient use and reasonable design.

[0044] In addition, when the present utility model is parked, it can achieve braking without additional manipulation by the user, meeting the requirements of safe parking, being convenient to use, and safe and reliable.

[0045] The push rod assembly 4 further has a non-pushing / trailer-using state; the wheel assembly linkage mechanism 7 is further configured to cancel the unlocking action on the wheel assembly locking mechanism 3 when the push rod assembly 4 is in the non-pushing / trailer-using state, so that the wheel assembly locking mechanism 3 locks the wheel assembly 2 relative to the lower vehicle frame body 1. In the vehicle frame in the non-pushing / trailer-using state, the wheel assembly locking mechanism 3 automatically locks the wheel assembly 2 relative to the lower vehicle frame body 1, ensuring the safe and reliable use of the vehicle frame.

[0046] In some other embodiments, the push rod assembly 4 further has a non-pushing / trailer-using state; the wheel assembly linkage mechanism 7 is further configured to be used for linking the unlocking action of the wheel assembly locking mechanism 3 when the push rod assembly 4 is in the non-pushing / trailer-using state, thereby releasing the locked state of the wheel assembly 2 relative to the lower vehicle frame body 1.

[0047] As Figure 3 shown, the push rod assembly 4 further has a lifting-using state; the wheel assembly linkage mechanism 7 is further configured to cancel the unlocking action on the wheel assembly locking mechanism 3 when the push rod assembly 4 is in the lifting-using state, so that the wheel assembly locking mechanism 3 locks the wheel assembly 2 relative to the lower vehicle frame body 1. In the vehicle frame in the lifting-using state, the wheel assembly locking mechanism 3 automatically locks the wheel assembly 2 relative to the lower vehicle frame body 1, ensuring the safe and reliable use of the vehicle frame.

[0048] Further, the lower vehicle frame body 1 includes a front foot rod 11 and a rear foot rod 12, and the upper end of the front foot rod 11 is connected to the upper end of the rear foot rod 12; the wheel assembly 2 includes a front wheel set 21 connected to the lower end of the front foot rod 11 and a rear wheel set 22 connected to the lower end of the rear foot rod 12; the wheel assembly locking mechanism 3 is located between the rear foot rod 12 and the rear wheel set 22 for locking the rear wheel set 22 relative to the rear foot rod 12; the lower end of the push rod assembly 4 is rotatably connected to the upper end of the front foot rod 11 or the upper end of the rear foot rod 12. Among them, the upper end of the front foot rod 11 is rotatably connected to the upper end of the rear foot rod 12, which is convenient for folding the vehicle frame so that its overall volume is smaller after folding, facilitating subsequent handling, packaging, etc.

[0049] In order to stably lock the push rod assembly relative to the rear foot rod, the push rod locking mechanism 5 is located between the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12; the push rod locking mechanism 5 includes a push rod locking groove respectively provided at the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12, and a push rod locking gear that is axially slidably arranged between the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12 and can be simultaneously engaged with the push rod locking grooves at the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12. A push rod locking elastic member is provided between the push rod locking gear and the upper end of the rear foot rod 12 for driving the push rod locking gear to be simultaneously engaged with the push rod locking grooves at the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12; the push rod locking gear is configured to be linked to perform a corresponding unlocking action by the push rod unlocking mechanism 6, thereby unlocking the locked state of the push rod assembly 4 relative to the rear foot rod 12. Among them, the structures of the push rod locking mechanism 5 and the push rod unlocking mechanism 6 can also refer to the structure of a stroller for children with smooth unfolding and folding in 202420085706.1.

[0050] For better linkage, the wheel assembly linkage mechanism 7 includes a wheel assembly linkage pin 71 movably arranged on the rear foot rod 12, and a first linkage unlocking portion 72 and a second linkage unlocking portion 73 both arranged at the lower end of the push rod assembly 4 and capable of being linked and cooperating with the wheel assembly linkage pin 71; the wheel assembly linkage mechanism 7 further includes a first linkage locking portion 74 arranged at the lower end of the push rod assembly 4 and located between the first linkage unlocking portion 72 and the second linkage unlocking portion 73; when the push rod assembly 4 is in the pushing and using state, the wheel assembly linkage pin 71 is used in cooperation with the first linkage unlocking portion 72; when the push rod assembly 4 is in the towing and using state, the wheel assembly linkage pin 71 is used in cooperation with the second linkage unlocking portion 73; when the wheel assembly linkage pin 71 is used in cooperation with the first linkage locking portion 74, the wheel assembly linkage pin 71 correspondingly links the wheel assembly locking mechanism 3 to lock the corresponding wheel assembly 2 relative to the lower vehicle frame body 1. As Figure 5 shown, at this moment, the push rod assembly 4 is in the pushing and using state, and the wheel assembly linkage pin 71 is used in cooperation with the first linkage unlocking portion 72, so that the wheel assembly locking pin 33 is disengaged from the wheel assembly locking groove 31 to release the locked state of the rear wheel set; if the push rod assembly is operated from the pushing and using state to the lifting and using state, that is, the push rod assembly is flipped forward relative to the rear foot rod, the wheel assembly linkage pin 71 moves from the first linkage unlocking portion 72 to the first linkage locking portion 74. At this moment, the wheel assembly linkage pin 71 is automatically engaged with the wheel assembly locking groove 31 under the elastic action of the sliding block resetting member; if the push rod assembly is continuously operated from the lifting and using state to the towing and using state, the wheel assembly linkage pin 71 moves from the first linkage locking portion 74 to the second linkage unlocking portion 73 to drive the wheel assembly linkage pin 71 to drive the wheel assembly locking pin 33 to move upward, so that the wheel assembly locking pin 33 is disengaged from the wheel assembly locking groove 31 to release the locked state of the rear wheel set.

[0051] In this embodiment, the linkage axle pin 71 of the operation wheel assembly moves upward relative to the rear foot rod to release the locking state of the rear wheel set, and the linkage axle pin 71 of the wheel assembly moves downward relative to the rear foot rod to restore the locking state of the rear wheel set.

[0052] As Figure 5 , 6 shown, the first linkage unlocking part 72 and the second linkage unlocking part 73 are arranged at a position close to or away from the rotation axis between the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12. Correspondingly, the first linkage locking part 74 is arranged at a position close to or away from the rotation axis between the lower end of the push rod assembly 4 and the upper end of the rear foot rod 12.

[0053] As Figure 5 , 6 shown, for reliable and convenient linkage, both the first linkage unlocking part 72 and the second linkage unlocking part 73 are unlocking convex parts arranged at the lower end of the push rod assembly 4, the first linkage locking part 74 is a locking concave part arranged at the lower end of the push rod assembly 4, and a linkage inclined wall is arranged between the unlocking concave part and the unlocking convex part.

[0054] As Figure 5 shown, for reliable locking and convenient unlocking, the wheel assembly locking mechanism 3 includes a wheel assembly locking groove 31 arranged on the rear wheel set 22 and a wheel assembly sliding block 32 slidably arranged on the rear foot rod 12. A wheel assembly locking axle pin 33 capable of being clamped into the wheel assembly locking groove 31 is arranged on the wheel assembly sliding block 32. A sliding block resetting part for driving the wheel assembly sliding block 32 to reset elastically is arranged between the wheel assembly sliding block 32 and the rear foot rod 12; the wheel assembly sliding block 32 is directly or indirectly connected to the linkage axle pin 71 of the wheel assembly. Among them, the sliding block resetting part can be a tension spring or a compression spring, etc. In this embodiment, the wheel assembly sliding block 32 is connected to the linkage axle pin 71 of the wheel assembly through a linkage part, and this linkage part can be a rigid part or a flexible part, such as a linkage rod, a linkage pull rope, etc.

[0055] Embodiment 2:

[0056] The difference between Embodiment 2 and Embodiment 1 is that, as Figure 7 , 8 shown, both the first linkage unlocking part 72 and the second linkage unlocking part 73 are unlocking concave parts arranged at the lower end of the push rod assembly 4, the first linkage locking part 74 is a locking convex part arranged at the lower end of the push rod assembly 4, and a linkage inclined wall is arranged between the unlocking concave part and the locking convex part.

[0057] Embodiment 3:

[0058] The difference between Embodiment 3 and Embodiment 1 is that, as Figure 9As shown in the figure, both the first linkage unlocking portion 72 and the second linkage unlocking portion 73 are unlocking convex portions provided at the lower end of the push rod assembly 4 and protruding outward. The first linkage locking portion 74 is a locking concave portion provided at the lower end of the push rod assembly 4, and a linkage inclined wall is provided between the unlocking concave portion and the unlocking convex portion.

[0059] A baby carriage of the present utility model includes a frame as described above and a seat provided on the frame. This baby carriage adopts the above-mentioned frame. Therefore, only one operation action is required to realize the corresponding actions of the push rod assembly and the wheel assembly, which has the characteristics of convenient use and reasonable design.

[0060] The present utility model can be used as a camp cart. When the camp cart is in a non-trailer use state, it is necessary to brake to prevent it from rolling. When the baby carriage needs to park (in a non-pushing or pulling use state), it is also necessary to brake for safety reasons.

Claims

1. A vehicle frame, characterized in that Comprising: A lower frame main body (1), and a plurality of sets of wheel assemblies (2) are connected to the lower frame main body (1); A wheel assembly locking mechanism (3), which is located between the lower frame main body (1) and the wheel assembly (2) and is used to lock at least one set of wheel assemblies (2) relative to the lower frame main body (1); A push rod assembly (4), the lower end of the push rod assembly (4) is rotatably connected to the lower frame main body (1), and the push rod assembly (4) has a pushing use state and / or a towing use state; A push rod locking mechanism (5), which is located between the push rod assembly (4) and the lower frame main body (1) and is used to lock the push rod assembly (4) relative to the lower frame main body (1); A push rod unlocking mechanism (6), which is arranged on the push rod assembly (4) and is used to link the unlocking action of the push rod locking mechanism (5), thereby unlocking the locked state of the push rod assembly (4) relative to the lower frame main body (1); A wheel assembly linkage mechanism (7), which is arranged between the push rod assembly (4) and the lower frame main body (1) and is used to link the unlocking action of the wheel assembly locking mechanism (3) when the push rod assembly (4) is in the pushing use state or the towing use state, thereby releasing the locked state of the wheel assembly (2) relative to the lower frame main body (1).

2. The frame according to claim 1, characterized in that The push rod assembly (4) further has a non-pushing / towing use state; The wheel assembly linkage mechanism (7) is further configured to cancel the unlocking action on the wheel assembly locking mechanism (3) when the push rod assembly (4) is in the non-pushing / towing use state, so that the wheel assembly locking mechanism (3) locks the wheel assembly (2) relative to the lower frame main body (1); Or, the wheel assembly linkage mechanism (7) is further configured to link the unlocking action of the wheel assembly locking mechanism (3) when the push rod assembly (4) is in the non-pushing / towing use state, thereby releasing the locked state of the wheel assembly (2) relative to the lower frame main body (1).

3. The frame according to claim 1, wherein The push rod assembly (4) further has a lifting use state, and the wheel assembly linkage mechanism (7) is further configured to cancel the unlocking action on the wheel assembly locking mechanism (3) when the push rod assembly (4) is in the lifting use state, so that the wheel assembly locking mechanism (3) locks the wheel assembly (2) relative to the lower frame main body (1).

4. A vehicle frame according to any one of claims 1 to 3, characterized in that The lower frame main body (1) includes a front foot rod (11) and a rear foot rod (12), and the upper end of the front foot rod (11) is connected to the upper end of the rear foot rod (12); The wheel assembly (2) includes a front wheel set (21) connected to the lower end of the front foot rod (11) and a rear wheel set (22) connected to the lower end of the rear foot rod (12); The wheel assembly locking mechanism (3) is located between the rear foot rod (12) and the rear wheel set (22) and is used to lock the rear wheel set (22) relative to the rear foot rod (12); The lower end of the push rod assembly (4) is rotatably connected to the upper end of the front foot rod (11) or the upper end of the rear foot rod (12).

5. The frame according to claim 4, wherein The push rod locking mechanism (5) is located between the lower end of the push rod assembly (4) and the upper end of the rear foot rod (12); The push rod locking mechanism (5) includes a push rod locking groove provided at the lower end of the push rod assembly (4) and the upper end of the rear foot rod (12) respectively, and a push rod locking gear that is axially slidable between the lower end of the push rod assembly (4) and the upper end of the rear foot rod (12) and can be simultaneously engaged with the push rod locking grooves at the lower end of the push rod assembly (4) and the upper end of the rear foot rod (12). A push rod locking elastic member is provided between the push rod locking gear and the upper end of the rear foot rod (12) for driving the push rod locking gear to be simultaneously engaged with the push rod locking grooves at the lower end of the push rod assembly (4) and the upper end of the rear foot rod (12). The push rod locking gear is configured to be linked to perform a corresponding unlocking action by the push rod unlocking mechanism (6), thereby unlocking the locked state of the push rod assembly (4) relative to the rear foot rod (12).

6. The vehicle frame according to claim 4, wherein The wheel assembly linkage mechanism (7) includes a wheel assembly linkage pin (71) movably provided on the rear foot rod (12), and a first linkage unlocking portion (72) and a second linkage unlocking portion (73) both provided at the lower end of the push rod assembly (4) and capable of being linked and cooperating with the wheel assembly linkage pin (71). The wheel assembly linkage mechanism (7) further includes a first linkage locking portion (74) provided at the lower end of the push rod assembly (4) and located between the first linkage unlocking portion (72) and the second linkage unlocking portion (73). When the push rod assembly (4) is in the state of being pushed for use, the wheel assembly linkage pin (71) is used in cooperation with the first linkage unlocking portion (72). When the push rod assembly (4) is in the state of being towed for use, the wheel assembly linkage pin (71) is used in cooperation with the second linkage unlocking portion (73). When the wheel assembly linkage pin (71) is used in cooperation with the first linkage locking portion (74), the wheel assembly linkage pin (71) correspondingly links the wheel assembly locking mechanism (3) to lock the corresponding wheel assembly (2) relative to the lower vehicle frame body (1).

7. The frame according to claim 6, wherein The first linkage unlocking portion (72) and the second linkage unlocking portion (73) are provided at positions on the lower end of the push rod assembly (4) close to or far from the rotation axis between the lower end of the push rod assembly (4) and the upper end of the rear foot rod (12). Correspondingly, the first linkage locking portion (74) is provided at a position on the lower end of the push rod assembly (4) close to or far from the rotation axis between the lower end of the push rod assembly (4) and the upper end of the rear foot rod (12).

8. The frame according to claim 7, characterized in that Both the first linkage unlocking portion (72) and the second linkage unlocking portion (73) are unlocking convex portions provided at the lower end of the push rod assembly (4). The first linkage locking portion (74) is a locking concave portion provided at the lower end of the push rod assembly (4), and a linkage inclined wall is provided between the unlocking concave portion and the unlocking convex portion. Alternatively, both the first linkage unlocking portion (72) and the second linkage unlocking portion (73) are unlocking concave portions provided at the lower end of the push rod assembly (4). The first linkage locking portion (74) is a locking convex portion provided at the lower end of the push rod assembly (4), and a linkage inclined wall is provided between the unlocking concave portion and the locking convex portion.

9. The frame according to claim 6, characterized in that The wheel assembly locking mechanism (3) includes a wheel assembly locking groove (31) provided on the rear wheel set (22) and a wheel assembly sliding block (32) slidably provided on the rear foot rod (12). A wheel assembly locking pin (33) capable of being engaged in the wheel assembly locking groove (31) is provided on the wheel assembly sliding block (32). A sliding block reset member for driving the elastic reset of the wheel assembly sliding block (32) is provided between the wheel assembly sliding block (32) and the rear foot rod (12); the wheel assembly sliding block (32) is directly or indirectly connected to the wheel assembly linkage pin (71).

10. A children's vehicle, characterized in that It includes a frame as described in any one of claims 1-9 and a seat provided on the frame.

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