Vehicle frame

Abstract

According to the frame, in a baby carriage pushing mode, a holding part is located at a first height, the ergonomic requirement in a conventional pushing scene can be met, and the operation comfort and convenience of long-distance pushing are improved. In the free pushing mode, the holding part is switched to the second height lower than the first height relative to the reference horizontal plane, the protruding part of the whole baby carriage in the vertical direction is reduced, the size is correspondingly reduced, and therefore the space occupied by the baby carriage in the using state is effectively reduced, and interference to the activity space of surrounding pedestrians is reduced; the use friendliness of the public space is improved; in the free pushing mode, the rear wheel assembly has the omni-directional rotating capacity, it means that the rear portion of the baby carriage can actively participate in steering, the overall steering flexibility of the baby carriage is remarkably improved, in-situ steering or extremely-small-radius turning can be achieved, the actual turning radius is greatly reduced, and the baby carriage is more flexible. The controllability and trafficability of the baby carriage in narrow spaces such as elevators, restaurants and subway carriages are remarkably improved, and the baby carriage is convenient to turn around and avoid quickly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mother and baby products, in particular to a frame. BACKGROUND

[0002] With the development of society, children's stroller (referred to as "stroller") has become an essential tool for infant travel. The stroller in the prior art usually adopts a fixed rear wheel structure, and the rear wheel does not have the ability to rotate freely, and can only realize steering through the front wheel. This structure design leads to the fact that the stroller needs to rely on a larger space to push in an arc when turning, and the actual turning radius is large. When turning or reversing in a narrow space (such as an elevator, a restaurant passageway, a subway car, etc.), it often needs to be moved back and forth several times to complete the operation, and the steering flexibility is poor, which brings great inconvenience to the user.

[0003] In addition, the handlebar assembly of the traditional stroller is usually fixed to the rear of the frame and has a high height, resulting in a large space occupation in the longitudinal and transverse directions of the whole vehicle. In the above-mentioned narrow space, the protruding handlebar not only occupies extra public space, but also is easy to collide with pedestrians, affecting the passage of others. SUMMARY

[0004] The purpose of the present application is to provide a frame, the protruding part of the stroller in the vertical direction is reduced, the volume is correspondingly reduced, and the user's body posture is closer to the stroller body, thereby effectively reducing the space occupation of the stroller in the use state, reducing the interference with the activity space of the surrounding pedestrians, and improving the use friendliness of the public space. Moreover, the rear wheel assembly has the ability to rotate in all directions, which means that the rear part of the stroller can also actively participate in steering, and the overall steering flexibility of the stroller is significantly improved, which can realize in-place steering or small-radius turning, greatly reducing the actual turning radius and significantly improving the steering and passing performance of the stroller in the elevator, restaurant, subway car and other narrow spaces, facilitating quick reversing and avoiding.

[0005] The embodiments of the present application can be implemented as follows: In a first aspect, the present application provides a frame for a stroller, comprising: a wheel frame; a front wheel assembly and a rear wheel assembly hinged to the wheel frame; a handlebar assembly provided on the wheel frame, the handlebar assembly comprising a holding part, the holding part being switchable between a first height and a second height relative to a reference horizontal plane, the second height being lower than the first height; wherein the frame has a stroller pushing mode and a free pushing mode, in the stroller pushing mode, the holding part is located at the first height relative to the reference horizontal plane; in the free pushing mode, the holding part is located at the second height, and the rear wheel assembly is rotatable relative to the wheel frame.

[0006] In an alternative embodiment, in the free pushing mode, the holding portion is located between the front wheel assembly and the rear wheel assembly.

[0007] In an alternative embodiment, in the process of switching from the stroller pushing mode to the free pushing mode, the holding portion is lowered to the second height accordingly.

[0008] In an alternative embodiment, the handlebar assembly further comprises a connecting portion, one end of the connecting portion is connected with the wheel support, and the other end of the connecting portion is connected with the holding portion.

[0009] In an alternative embodiment, the connecting portion is hinged with the wheel support.

[0010] In an alternative embodiment, the connecting portion is a telescopic tube. or, the connecting portion is slidingly fitted with the wheel support, so that the holding portion can be switched between the first height and the second height relative to the wheel support.

[0011] In an alternative embodiment, the frame further comprises a rear wheel locking assembly arranged between the rear wheel assembly and the wheel support, the rear wheel locking assembly has a rear wheel locking state and a rear wheel releasing state; in the rear wheel locking state, the rear wheel assembly is relatively fixed relative to the wheel support; in the rear wheel releasing state, the rear wheel assembly can rotate relative to the wheel support; in the stroller pushing mode, the rear wheel locking assembly is in the rear wheel locking state; in the free pushing mode, the rear wheel locking assembly can be switched between the rear wheel locking state and the rear wheel releasing state.

[0012] In an alternative embodiment, the rear wheel locking assembly comprises a resilient member and a locking member, the locking member is slidingly arranged in the wheel support and connected with the resilient member, the resilient member is connected with the wheel support, and the resilient member is used to make the locking member have a movement tendency extending to the rear wheel assembly.

[0013] In an alternative embodiment, the rear wheel assembly is provided with a socket, and the locking member can extend into the socket under the action of the resilient member.

[0014] In an alternative embodiment, the frame further comprises a rear wheel releasing assembly arranged in the holding portion, the rear wheel releasing assembly is coupled with the rear wheel locking assembly; the rear wheel releasing assembly is used to control the rear wheel locking assembly to switch between the rear wheel locking state and the rear wheel releasing state.

[0015] In an optional embodiment, the rear wheel release assembly comprises a rear wheel release operating member and a rear wheel cable; The rear wheel release operating member is arranged on the handle portion and connected with the rear wheel locking assembly through the rear wheel cable; The rear wheel release operating member is used to pull the rear wheel cable to separate the rear wheel locking assembly from the rear wheel assembly.

[0016] In an optional embodiment, the handle portion is a hollow tube; The rear wheel release operating member comprises a button and a rear wheel traction seat; The rear wheel traction seat is slidably arranged in the handle portion; The button is slidingly embedded in the handle portion; When the button is pressed, the rear wheel traction seat moves under the action of the button in a direction that forms an angle with the pressing direction of the rear wheel release operating member to tighten the rear wheel cable.

[0017] In an optional embodiment, a wedge is arranged in the handle portion, the wedge has a wedge surface that forms an acute angle with the pressing direction of the button, the wedge is located between the button and the rear wheel traction seat, the button abuts against the wedge, and the wedge surface slidingly abuts against the rear wheel traction seat.

[0018] In a second aspect, the present application provides a frame for a child vehicle, comprising: A wheel frame; A front wheel assembly and a rear wheel assembly hinged to the wheel frame; A handle assembly arranged on the wheel frame, the handle assembly comprising a handle portion; A rear wheel locking assembly arranged between the rear wheel assembly and the wheel frame, the rear wheel locking assembly having a rear wheel locking state and a rear wheel release state, in the rear wheel locking state, the rear wheel assembly is relatively fixed with respect to the wheel frame, and in the rear wheel release state, the rear wheel assembly can rotate with respect to the wheel frame; Wherein, the frame has a free pushing mode, in the free pushing mode, the handle portion is located between the front wheel assembly and the rear wheel assembly, and the handle portion can switch the rear wheel locking assembly between the rear wheel locking state and the rear wheel release state.

[0019] In an optional embodiment, the handle assembly further comprises a connecting portion, one end of the connecting portion is hinged to the wheel frame, and the other end is connected with the handle portion.

[0020] In an optional embodiment, the handle portion is hinged to the connecting portion, and the handle portion can move between the front wheel assembly and the rear wheel assembly.

[0021] In optional embodiments, the frame further comprises a seat and / or a canopy disposed on the wheel base; The handle comprises a first handle and a second handle, the second handle being selectively disposed on one of the wheel base, the first handle, the seat, or the canopy; The second handle is fixed or movable between the front wheel assembly and the rear wheel assembly, and an upper end of the second handle is spaced apart from an upper end of the first handle.

[0022] In optional embodiments, the frame further has a stroller pushing mode, in which the rear wheel locking assembly is in the rear wheel locking state; In the process of switching from the stroller pushing mode to the free pushing mode, the handle moves between the front wheel assembly and the rear wheel assembly, and the rear wheel locking assembly switches to the rear wheel releasing state.

[0023] In a third aspect, the present application provides a frame for a child stroller, comprising: a wheel base; a front wheel assembly and a rear wheel assembly hinged to the wheel base; a handle assembly disposed on the wheel base, the handle assembly comprising a handle, the handle being switchable between a first height and a second height relative to a reference horizontal plane, the second height being lower than the first height; a rear wheel locking assembly disposed between the rear wheel assembly and the wheel base, the rear wheel locking assembly having a rear wheel locking state and a rear wheel releasing state, in the rear wheel locking state, the rear wheel assembly is relatively fixed relative to the wheel base, and in the rear wheel releasing state, the rear wheel assembly is rotatable relative to the wheel base; The frame has a free pushing mode and a stroller pushing mode, in the free pushing mode, the handle is at the second height, the handle is between the front wheel assembly and the rear wheel assembly, and the rear wheel locking assembly is switchable between the rear wheel locking state and the rear wheel releasing state; In the stroller pushing mode, the handle is at the first height, and the rear wheel locking assembly is switchable between the rear wheel locking state and the rear wheel releasing state.

[0024] Compared with the prior art, the embodiments of the present application have the following advantages, for example: The frame is in a stroller pushing mode, the holding part is at a first height, which is beneficial to meet the ergonomic demand in a regular pushing scene, so that users with different heights can push straightly in a natural and comfortable posture, reduce the waist burden caused by bending, and improve the control comfort and convenience of long-distance pushing. In the free pushing mode, the holding part is switched to a second height lower than the first height relative to the reference horizontal plane, the protruding part of the stroller in the vertical direction is reduced, the volume is correspondingly reduced, and the user's body posture is closer to the stroller body, thereby effectively reducing the space occupation of the stroller in the use state, reducing the interference with the surrounding pedestrian activity space, and improving the use friendliness of the public space. Moreover, in the free pushing mode, the rear wheel assembly has omnidirectional rotation capability, which means that the rear part of the stroller can also actively participate in steering, and the overall steering flexibility of the stroller is significantly improved, which can realize in-place steering or small-radius turning, greatly reducing the actual turning radius and significantly improving the maneuverability and passability of the stroller in narrow spaces such as elevators, restaurants, and subway cars, facilitating quick turning and avoiding. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 One of the schematic diagrams of the frame of the first embodiment in the stroller pushing mode; Figure 2 One of the schematic diagrams of the frame of the first embodiment in the stroller pushing mode; Figure 3 Schematic diagram of the frame of the first embodiment in the free pushing mode; Figure 4 Schematic diagram of the frame of the first embodiment in the free pushing mode; Figures 1 to 3 Schematic diagram of the combination structure of the connecting part and the backrest tube in the first embodiment; Figure 5 Schematic diagram of the combination structure of the connecting part and the backrest tube in the first embodiment; Figures 1 to 3 Schematic diagram of the combination structure of the rear wheel locking assembly and the rear wheel assembly in the first embodiment; Figure 6 Schematic diagram of the combination structure of the holding part and the rear wheel release assembly in the first embodiment; Figures 1 to 3 Schematic diagram of the combination structure of the holding part and the rear wheel release assembly in the first embodiment; Figure 7 Figure 6 Schematic diagram of the combination structure of the holding part and the rear wheel release assembly in the first embodiment; Figure 8 Schematic diagram of the combination structure of the holding part and the rear wheel release assembly in the first embodiment; Figure 7 Schematic diagram of the combination structure of the holding part and the rear wheel release assembly in the first embodiment; Figure 9 Schematic diagram of the combination structure of the holding part and the rear wheel release assembly in the first embodiment; Figure 7 ​Schematic diagram of two rear wheel traction seats; Figure 10 For Figure 7 Schematic diagram of buttons; Figure 11 Schematic diagram of the frame of the second embodiment in the stroller pushing mode; Figure 12 Schematic diagram of the frame of the second embodiment in the stroller pushing mode; Figure 13 Schematic diagram of the frame of the third embodiment in the stroller pushing mode; Figure 14 Schematic diagram of the frame of the third embodiment in the stroller pushing mode; Figure 15 Schematic diagram of the frame of the fourth embodiment in the free pushing mode; Figure 16 Schematic diagram of the frame of the fourth embodiment in the free pushing mode; Figure 17 Schematic diagram of the frame of the fifth embodiment in the stroller pushing mode; Figure 18 Schematic diagram of the frame of the fifth embodiment in the stroller pushing mode; Figure 19 Schematic diagram of the frame of the fifth embodiment in the free pushing mode; Figure 20 Schematic diagram of the frame of the sixth embodiment in the stroller pushing mode; Figure 21 Schematic diagram of the frame of the sixth embodiment in the stroller pushing mode.

[0027] Icon: 100-wheel frame; 110-backrest tube; 111-slotted hole; 200-front wheel assembly; 300-rear wheel assembly; 310-wheel body mounting seat; 311-socket; 320-wheel body; 400-handlebar assembly; 410-grip; 411-rotating sleeve; 412-first handlebar; 413-second handlebar; 420-connection part; 421-sliding block; 450-rotating joint; 600-rear wheel locking assembly; 610-elastic member; 620-locking member; 700-rear wheel releasing assembly; 710-button; 711-push plate; 720-wedge; 721-wedge surface; 730-rear wheel traction seat; 731-baffle; 732-avoidance slot; 734-wedge-shaped slot; 800-pull; 900-roof. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0030] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Some embodiments of the present application will be described in detail with reference to the drawings, which are shown by way of illustration. The following embodiments and features of the embodiments can be combined with each other, without conflict.

[0035] With reference to Figures 1 to 3 The embodiments of the present application disclose a vehicle frame, which is mainly used for a child vehicle and serves as a skeleton of the child vehicle. The vehicle frame comprises a carrier, a wheel frame 100, a front wheel assembly 200, a rear wheel assembly 300 and a handle assembly 400.

[0036] The wheel frame 100 mainly provides a space for mounting various components and serves as a carrier.

[0037] The carrier is arranged on the wheel frame 100 and mainly serves as a seat for a baby or a child. The carrier can be a seat connected with the vehicle frame, a detachable seat, a basket or a sleeping basket.

[0038] The front wheel assembly 200 and the rear wheel assembly 300 are hinged to the wheel frame 100 and can change the direction to realize flexible pushing.

[0039] The handle assembly 400 is arranged on the wheel frame 100 and mainly serves as an operating space for a user to push the whole vehicle frame.

[0040] The handle assembly 400 comprises a holding part 410, which can be switched between a first height and a second height relative to a reference horizontal plane, and the second height is lower than the first height. The vehicle frame has a child vehicle pushing mode and a free pushing mode. In the child vehicle pushing mode, the holding part 410 is located at the first height relative to the reference horizontal plane. In the free pushing mode, the holding part 410 is located at the second height relative to the reference horizontal plane, and the rear wheel assembly 300 can rotate relative to the wheel frame 100.

[0041] In this way, in the stroller pushing mode, the holding part 410 is located at the first height, which is beneficial to meet the ergonomic requirements in the conventional pushing scene, so that users with different heights can push the stroller in a natural and comfortable posture, reduce the burden on the waist caused by bending, and improve the comfort and convenience of long-distance pushing. In the free pushing mode, the holding part 410 is switched to the second height lower than the first height relative to the reference horizontal plane, the protruding part of the stroller in the vertical direction is reduced, the volume is correspondingly reduced, and the user's body posture is closer to the stroller body, thereby effectively reducing the space occupation of the stroller in the use state, reducing the interference with the surrounding pedestrian space, and improving the use friendliness of the public space. Moreover, in the free pushing mode, the rear wheel assembly 300 has omnidirectional rotation capability, which means that the rear part of the stroller can also actively participate in steering, and the overall steering flexibility of the stroller is significantly improved, which can realize in-place steering or small-radius turning, greatly reducing the actual turning radius and significantly improving the maneuverability and passability of the stroller in narrow spaces such as elevators, restaurants, and subway cars, facilitating quick turning and avoiding.

[0042] In addition, it should be noted that in the conventional pushing state of the prior art stroller, the infant is located at the front of the stroller, and the user is located at the rear, and the infant is at the forefront of the pushing direction. When the stroller encounters a sudden obstacle or collision during forward movement, the infant will directly bear the impact force, and the safety risk is high.

[0043] To improve the above problems, in the free pushing mode, the holding part 410 is located between the front wheel assembly 200 and the rear wheel assembly 300 (refer to Figure 3 ). In this way, when the holding part 410 is switched to the position between the front and rear wheels, the user can naturally push the stroller in a sideways posture, i.e., the pusher is located on one side of the stroller, facing the direction of travel or the infant, to realize lateral pushing operation. In this side pushing state, the infant seat area is no longer at the forefront of the pushing direction, but is shifted to the relatively closed area behind the body of the pusher and the stroller body. In this way, when passing through dangerous intersections or complex environments, the user can switch to the free pushing mode and use the side pushing method to actively place the infant in the relatively safe inner side area, using the body as a physical barrier to effectively isolate the external impact and collision risk from the direction of travel. At the same time, the side pushing posture allows the pusher to simultaneously consider the front road conditions and the infant's state, improving the emergency response capability and monitoring efficiency. In summary, the frame of the present embodiment not only optimizes the steering flexibility, but also realizes situational safety protection through mode switching, significantly improving the safety in high-risk scenarios.

[0044] The handle assembly 400 further comprises a connecting portion 420, one end of which is connected with the wheel frame 100 and the other end of which is connected with the holding portion 410. The connecting portion 420 serves as a structural connection and transmission carrier between the holding portion 410 and the vehicle frame, and is designed to enable the holding portion 410 to smoothly switch between the first height and the second height relative to the reference horizontal plane while maintaining structural stability.

[0045] The connecting portion 420 is hinged to the wheel frame 100 through a rotary joint 450, and the hinged structure enables the connecting portion 420 to perform rotary motion about a preset rotary axis relative to the wheel frame 100, thereby enabling the holding portion 410 connected thereto to switch between the height positions and the front and rear positions.

[0046] In the process of switching from the stroller pushing mode to the free pushing mode, the holding portion 410 is lowered to the second height. In this way, the mode switching is designed as a linkage mechanism, and the height change of the holding portion 410 is decoupled from or synchronized with the steering state of the rear wheel assembly 300 during the switching process, i.e., when the holding portion 410 is lowered to the second height, the rear wheel assembly 300 is triggered or simultaneously allowed to enter the freely rotatable state, reducing the operation steps.

[0047] The connection manner of the connecting portion 420 and the holding portion 410 is not limited, for example, it can be an integral connection or a fixed connection such as welding, or it can be the hinged connection as shown.

[0048] Of course, it can be understood that if the connecting portion 420 and the holding portion 410 are rigidly connected and the connecting portion 420 is a rigid rod structure that cannot be stretched, the entire handle assembly 400 directly rotates about the fixed hinge point on the wheel frame 100, and in the process of mode switching, the motion trajectory of the holding portion 410 will follow a circular arc path centered on the hinge point. At this time, when the vehicle frame is switched from the stroller pushing mode to the free pushing mode, the height of the holding portion 410 will not be lowered, but will be slightly raised (compared to the first height) due to rotation, and the expected low operating posture cannot be achieved.

[0049] Therefore, in the present embodiment, through a specific mechanical linkage structure, it is ensured that in the process of switching the handle assembly 400 from the stroller pushing mode to the free pushing mode, the holding portion 410 can automatically and reliably be lowered from the first height to the second height, thereby meeting the ergonomic requirements in different use scenarios.

[0050] For example, the rotary joint 450 and the connecting portion 420 are made into a crank slider 421 mechanism, specifically referring to Figure 4The rotating joint 450 can be designed as a long strip or rod structure with a certain length, one end of which is hinged to the wheel frame 100, the other end of which is hinged to one end of the connecting part 420, and the middle part of the connecting part 420 is in sliding fit with the sliding groove 111 on the backrest tube 110 through the sliding block 421, wherein the backrest tube 110 is fixedly connected to the wheel frame 100.

[0051] In this way, in the stroller pushing mode, the holding part 410 is located at the first height (high position), the sliding block 421 is located at the upper end position of the sliding groove 111, and the rotating joint 450 is generally in the same direction as the connecting part 420, and the overall structure is stable. In the process of switching to the free pushing mode, the user pushes the holding part 410 forward and downward, the sliding block 421 is forced to slide downward along the sliding groove 111, at the same time, the rotating joint 450 rotates backward relative to the wheel frame 100, the connecting part 420 rotates forward around the rotating joint 450, and finally the holding part 410 is lowered to the second height between the front and rear wheels. Conversely, in the process of switching from the free pushing mode to the stroller pushing mode, the holding part 410 is pulled upward and backward, the sliding block 421 moves upward along the sliding groove 111, the rotating joint 450 rotates forward, the connecting part 420 rotates backward, and finally the holding part 410 is located above the rear wheel assembly 300 and rises to the first height.

[0052] It should be noted that the frame of the present embodiment can be made into a reversible stroller, or a non-reversible stroller. The so-called reversible stroller means that the holding part 410 can be arranged on the front side of the vehicle or on the rear side of the vehicle, and the user can push the stroller normally regardless of pushing from the front end or the rear end of the stroller, and the frame is in the stroller pushing mode in both directions.

[0053] In this design, the definition of the rear wheel assembly 300 is dynamically adjusted according to the pushing direction: when the holding part 410 is located on the rear side of the vehicle, the wheel set located below it is the rear wheel assembly 300, and the front wheel assembly 200 is located in front and dominates the steering; when the holding part 410 is switched to the front side of the vehicle (i.e. the pusher pushes the stroller backward from the front), the wheel set located below the holding part 410 is defined as the new rear wheel assembly 300, and the original rear wheel set becomes the front wheel assembly 200. In other words, the rear wheel assembly 300 is the wheel set located directly below or near the rear of the user relative to the position of the holding part 410.

[0054] The so-called non-reversible stroller means that the user can only push the stroller forward, and the holding part 410 is usually arranged at the rear end of the frame, and its position usually does not pass the front of the front wheel assembly 200. In such a structure, the holding part 410 is only in the stroller pushing mode when it is located above or behind the rear wheel assembly 300, that is, the rear wheel assembly 300 remains fixed or limited steering state, the front wheel assembly 200 dominates the steering, and stable forward pushing is achieved.

[0055] In summary, the frame provided by the embodiment can be applied to non-reversible strollers and can be extended to reversible strollers, showing good technical compatibility and adaptability.

[0056] In the embodiment, in order to realize the fixing or universal rotation of the rear wheel assembly 300 relative to the wheel frame 100, the frame further comprises a rear wheel locking assembly 600 arranged between the rear wheel assembly 300 and the wheel frame 100, the rear wheel locking assembly 600 having a rear wheel locking state and a rear wheel unlocking state; In the rear wheel locking state, the rear wheel assembly 300 is relatively fixed relative to the wheel frame 100; In the rear wheel unlocking state, the rear wheel assembly 300 can rotate relative to the wheel frame 100; In the stroller pushing mode, the rear wheel locking assembly 600 is in the rear wheel locking state to ensure the driving stability in the conventional pushing process, prevent the snake phenomenon caused by the rear wheel shaking, and improve the steering accuracy; In the free pushing mode, the rear wheel locking assembly 600 can be switched between the rear wheel locking state and the rear wheel unlocking state, so that the frame can allow the user to select whether to unlock in the free pushing mode according to the actual needs. For example, the rear wheel can be kept locked to stabilize the pushing in a wider channel, and the rear wheel can be unlocked to realize the spot steering in an extremely narrow space, so as to give the user higher steering autonomy and adaptability. In the process of switching from the stroller pushing mode to the free pushing mode, the holding part 410 is moved between the front wheel assembly 200 and the rear wheel assembly 300, and the rear wheel locking assembly 600 is switched to the rear wheel unlocking state, realizing linkage and reducing the operation steps.

[0057] Of course, it can be understood that according to the actual needs, the rear wheel assembly 300 can also rotate relative to the wheel frame 100 in the stroller pushing mode, that is, in the stroller pushing mode, the rear wheel locking assembly 600 can be switched between the rear wheel locking state and the rear wheel unlocking state.

[0058] In detail, referring to Figure 5The rear wheel locking assembly 600 comprises an elastic member 610 and a locking member 620. The locking member 620 is slidably arranged in the wheel frame 100 (e.g. limited by a guide slot, guide rail or sliding hole structure to enable linear movement relative to the wheel frame 100) and connected with the elastic member 610. The elastic member 610 is connected to the wheel frame 100 (the elastic member 610 can be a compression spring, a tension spring, a torsion spring or a rubber elastic body, one end of which is fixed to the wheel frame 100 and the other end of which is connected to or abuts against the locking member 620). The elastic member 610 is used to make the locking member 620 have a movement tendency extending towards the rear wheel assembly 300. When no external force is applied, the elastic force pushes the locking member 620 to extend into the locking structure of the rear wheel assembly 300. The rear wheel assembly 300 is rigidly limited and cannot freely rotate, realizing mechanical locking, thereby fixing the rear wheel assembly 300 relative to the wheel frame 100 and preventing it from freely rotating around the vertical axis, ensuring the stability of the rear wheel in the stroller pushing mode, only the front wheel steering, ensuring the straight-line driving performance. The user can operate to make the locking member 620 overcome the elastic force of the elastic member 610 to separate the locking member 620 from the rear wheel assembly 300, so that the rear wheel can freely rotate, realizing flexible pushing in the free pushing mode.

[0059] The rear wheel assembly 300 is provided with a plug hole 311, and the locking member 620 can extend into the plug hole 311 under the action of the elastic member 610, thereby realizing the rotational locking of the rear wheel assembly 300 relative to the wheel frame 100.

[0060] Specifically, the plug hole 311 is arranged on a wheel body mounting seat 310 of the rear wheel assembly 300. The wheel body mounting seat 310 is hingedly connected with the wheel frame 100 through a numerical hinge shaft, and a rear wheel body 320 is rotatably mounted on the wheel body mounting seat 310, and the rotation axis is horizontal. The axial rotation center axis of the plug hole 311 intersects or is parallel to the sliding direction of the locking member 620, for example, is arranged vertically to match the sliding direction of the locking member 620. The cross-sectional shape of the plug hole 311 can be circular, rectangular or polygonal, and the shape of the end of the corresponding locking member 620 is matched to ensure reliable engagement and prevent slipping or shearing failure.

[0061] In the rear wheel locking state, the elastic member 610 (such as a compression spring) continuously applies a pushing force to the locking member 620 to drive the locking member 620 to move along the sliding direction, so that the locking pin or clamping head at the front end of the locking member 620 is completely inserted into the plug hole 311. At this time, the rotation path of the rear wheel assembly 300 is mechanically blocked and cannot freely rotate around its vertical axis, thereby fixing the orientation of the rear wheel and ensuring the straight-line driving stability and control certainty of the stroller in the stroller pushing mode.

[0062] When the rear wheel is in the released state, the locking member 620 is withdrawn from the insertion hole 311, and the rear wheel assembly 300 is turned so that the insertion hole 311 and the locking member 620 are deviated, so that the locking member 620 is not inserted into the insertion hole 311, thereby realizing flexible rotation of the rear wheel assembly 300, and after the rear wheel assembly 300 is turned back to the original position, the locking member 620 is automatically inserted into the insertion hole 311 under the action of the elastic member 610, thereby automatically locking the rear wheel assembly 300.

[0063] Reference Figure 1 and Figure 6 The frame further comprises a rear wheel release assembly 700 arranged on the holding portion 410, which is coupled with the rear wheel locking assembly 600. The rear wheel release assembly 700 is used to control the rear wheel locking assembly 600 to switch between the locked state and the released state, and is coupled with the locking member to separate the locking member 620 from the rear wheel assembly 300.

[0064] Therefore, after the user operates the rear wheel release assembly 700, the operating force is transmitted to the locking member 620 to overcome the elastic force of the elastic member 610, so that the locking member 620 is upwardly slid and withdrawn from the insertion hole 311. Once separated from the insertion hole 311, the rear wheel assembly 300 is no longer rotationally limited and can freely rotate about the vertical axis relative to the wheel frame 100, thereby entering the rear wheel released state and providing a structural basis for flexible rotation (such as rotation in place and lateral movement) in the free pushing mode.

[0065] The rear wheel release assembly 700 comprises a rear wheel release operating member and a rear wheel cable. The rear wheel release operating member is arranged on the holding portion 410 and is connected with the locking member 620 of the rear wheel locking assembly 600 through the rear wheel cable. The rear wheel release operating member is used to pull the rear wheel cable to separate the rear wheel locking assembly 600 from the rear wheel assembly 300.

[0066] Therefore, when the user operates the rear wheel release operating member, the operating force is transmitted to the locking member 620 through the flexible transmission element (rear wheel cable) to pull the locking member 620 to overcome the elastic force of the elastic member 610 (such as a compression spring) and retract it in the sliding direction, thereby driving the locking end of the locking member 620 to be withdrawn from the insertion hole 311 of the rear wheel assembly 300, realizing separation of the rear wheel locking assembly 600 from the rear wheel assembly 300, and making the rear wheel assembly 300 enter the rear wheel released state in which it can freely rotate.

[0067] The holding portion 410 is a hollow tubular structure, and a channel for accommodating and guiding the transmission member is formed in the interior thereof, which is conducive to internal wiring and compact structure design. Reference Figure 6 and Figure 7The rear wheel release operating member comprises a button 710 and a rear wheel traction seat 730. The rear wheel traction seat 730 is slidably arranged in the holding portion 410. The button 710 is slidably embedded in the holding portion 410 and partially exposed on the surface of the holding portion 410, so as to facilitate the user to press the button 710 with fingers. The inner end of the button 710 extends into the inner cavity of the holding portion 410 and forms a mechanical transmission cooperation with the rear wheel traction seat 730. When the button 710 is pressed, the inner end of the button 710 pushes or pulls the rear wheel traction seat 730. Thus, the rear wheel traction seat 730 is moved along a direction which is at an angle to the pressing direction of the button 710 under the action of the button 710, so as to drive the steel wire core of the rear wheel cable connected with the rear wheel traction seat 730 to move synchronously, to tighten the rear wheel cable, to transmit the operating force to the locking member 620 of the rear wheel locking assembly 600, to overcome the elastic force of the elastic member 610, to make the locking member 620 exit from the insertion hole 311 of the rear wheel assembly 300, and to realize the release of the rear wheel.

[0068] With reference to Figure 7 and Figure 8 A wedge block 720 is arranged in the holding portion 410. The wedge block 720 has a wedge surface 721 which is at an acute angle to the pressing direction of the button 710. The wedge block 720 is located between the button 710 and the rear wheel traction seat 730. The button 710 abuts against the wedge block 720, and the wedge surface 721 slidably abuts against the rear wheel traction seat 730.

[0069] Thus, the button 710 forms a wedge surface 721 transmission pair with the rear wheel traction seat 730 through the wedge surface 721, to convert the vertical pressing movement into axial traction movement. When the user presses the button 710 downward, the wedge surface 721 of the wedge block 720 will force the rear wheel traction seat 730 which slidably abuts against the wedge surface 721 to produce a relative displacement along a direction which is at an angle to the pressing direction (preferably the axial direction or the approximate axial direction of the holding portion 410). The wedge surface 721 pushing effect converts the vertical pressing force of the button 710 into a horizontal (or axial) force on the rear wheel traction seat 730, so as to drive the rear wheel traction seat 730 to slide in the inner cavity of the holding portion 410.

[0070] The sliding of the rear wheel traction seat 730 drives the steel wire core of the rear wheel cable connected with the rear wheel traction seat 730 to move synchronously, to gradually tighten the cable, and finally to transmit the operating force to the locking member 620 of the rear wheel locking assembly 600, to overcome the elastic force of the elastic member 610, to make the locking member 620 exit from the insertion hole 311 of the rear wheel assembly 300, and to complete the release action. Thus, the rear wheel cable is tightened or loosened, to realize the efficient force transmission and direction conversion in a compact space, with simple structure and rapid response.

[0071] It can be understood that the stroller is usually configured with two sets of rear wheel assemblies 300 (i.e., left and right rear wheel assemblies 300) respectively located on both sides of the frame. In order to ensure the stability and symmetry of the operation, the rear wheel locking function needs to be independently set for each set of rear wheel assemblies 300. Therefore, correspondingly, in the embodiment, a set of independent transmission paths is provided for each set of rear wheel assemblies 300, that is, one rear wheel traction seat 730 and one rear wheel cable are provided for each rear wheel assembly 300.

[0072] In Figure 7 In the embodiment shown, the number of rear wheel traction seats 730 is two, which are left and right rear wheel traction seats 730, and are symmetrically arranged in the inner cavity of the holding part 410.

[0073] Continuing to refer to Figure 8 , the wedge block 720 is generally triangular or trapezoidal in cross-section, and two inclined wedge surfaces 721 are formed on the two sides thereof. When the button 710 is pressed, the wedge block 720 moves downward together with the button 710, and the two wedge surfaces 721 are in sliding contact with the abutting surfaces on the left and right rear wheel traction seats 730, respectively.

[0074] Since the cross-section of the wedge block 720 is geometrically thick in the middle and thin on both sides, when it moves downward, the two wedge surfaces 721 will respectively exert outward pushing force on the left and right rear wheel traction seats 730, that is, the left rear wheel traction seat 730 is pushed by the left wedge surface 721 to move leftward along the inner cavity of the holding part 410, thereby tightening the rear wheel cable connected to the right rear wheel assembly 300; the right rear wheel traction seat 730 is pushed by the right wedge surface 721 to move rightward along the inner cavity of the holding part 410, thereby tightening the rear wheel cable connected to the left rear wheel assembly 300.

[0075] That is, the left traction seat controls the unlocking of the right rear wheel, and the right traction seat controls the unlocking of the left rear wheel, forming a cross-linkage mechanism. Through this design, when the user presses the button 710, the left and right rear wheel traction seats 730 are simultaneously and symmetrically moved away from each other under the action of the wedge block 720, each pulling the corresponding rear wheel cable, thereby simultaneously releasing the left and right rear wheel locking assemblies 600, and synchronously unlocking the left and right rear wheel assemblies 300, so that they enter the universal rotating state at the same time.

[0076] In addition, in order to better cooperate with the wedge surface 721 of the wedge block 720, the rear wheel traction seat 730 is also provided with a wedge-shaped groove 734 (refer to Figure 9 ), and the groove bottom of the wedge-shaped groove 734 is at an acute angle with the pressing direction, so that the wedge surface 721 and the groove bottom of the wedge-shaped groove 734 slide together.

[0077] In the embodiment, the middle part of the holding part 410 is provided with a rotatable rotating sleeve 411, and the rear wheel traction seats 730 and the wedge block 720 are arranged in the inner cavity of the rotating sleeve 411 to form an integrated release execution unit. The button 710 is slidably embedded in the window of the outer wall of the rotating sleeve 411, so that it can be pressed along the radial direction or the inclined direction relative to the rotating sleeve 411.

[0078] Since the rotating sleeve 411 can rotate freely around the axis of the holding part 410, when the user holds the stroller handle and adjusts the standing position or the pushing angle, the rotating sleeve 411 can be rotated by a finger flick or natural holding force, thereby driving the button 710 to rotate synchronously, so that it is always directed to the direction in which the user's finger can exert the most natural and comfortable force, thereby improving the operation convenience and comfort.

[0079] In order to ensure that the wedge block 720 can accurately and stably prop open the two rear wheel traction seats 730 during pushing, avoid deflection, jamming or uneven force, and ensure that the left and right rear wheel assemblies 300 are synchronously and reliably unlocked, the rear wheel traction seats 730 are provided with baffles 731.

[0080] Specifically, with reference to Figure 9 each rear wheel traction seat 730 (left and right) is provided with one or more baffles 731 extending outwardly towards the button 710. The baffle 731 is provided with an avoiding slot 732, which is a through hole or an open slot, and the shape thereof is matched with the cross section of the wedge block 720, thereby forming a transverse limiting and guiding effect on the wedge block 720.

[0081] With reference to Figure 7 and Figure 10 the wedge block 720 passes through the avoiding slots 732 of the two rear wheel traction seats 730 vertically. The button 710 is provided with a pushing plate 711 capable of extending into the two rear wheel traction seats 730 between the baffles 731 and the avoiding slots 732, and the pushing plate 711 is substantially cross-shaped. When the button 710 is pressed, the wedge block 720 moves inwardly along the pressing direction, and the two inclined wedge surfaces 721 on the sides thereof slide against the inner side surfaces of the left and right rear wheel traction seats 730, respectively, thereby driving the two rear wheel traction seats 730 to move away from each other along the axial direction. Since the pushing plate 711 extends between the two baffles 731 and the avoiding slots 732, the baffles 731 can constrain the pushing plate 711, thereby improving the stability when the button 710 is pressed.

[0082] Second embodiment With reference to Figure 11 and Figure 12Unlike the first embodiment, in the present embodiment, the height of the holding portion 410 is not limited in the free pushing mode, as long as the holding portion 410 can move to the central position (between the front wheel assembly 200 and the rear wheel assembly 300) in the mode. At this time, the rotating joint 450 is in a cylindrical shape (such as a pin, a bearing sleeve, etc.), which only serves as a hinge point, and the connecting portion 420 directly moves in a circular motion around the wheel frame 100.

[0083] In addition, in the present embodiment, the frame further comprises a handle locking assembly, which is arranged at the hinge position (i.e., the rotating joint 450) of the connecting portion 420 and the wheel frame 100. The handle locking assembly has a handle locking state and a handle unlocking state. In the handle locking state, the connecting portion 420 is fixed relative to the wheel frame 100, ensuring the structural stability during pushing. In the handle unlocking state, the connecting portion 420 can rotate relative to the wheel frame 100, thereby realizing the switching of the holding portion 410 between the first height and the second height.

[0084] In this way, when the user needs to switch from the stroller pushing mode to the free pushing mode, first, the handle locking assembly is operated to enter the handle unlocking state, and the locking of the hinge point is released. Then, the holding portion 410 is pushed forward, so that it moves from above the rear wheel assembly 300 to between the front wheel assembly 200 and the rear wheel assembly 300 while descending from the first height to the second height. When the holding portion 410 reaches the target position, the handle locking assembly can be automatically or manually restored to the handle locking state, thereby stably fixing the handle assembly 400 at the intermediate low position, and completing the mode switching. Conversely, when switching back to the stroller pushing mode, the locking is released again, the holding portion 410 is lifted to the high position, and then the locking is re-established.

[0085] The frame further comprises a handle unlocking assembly, which is coupled with the handle locking assembly and used to control the switching of the handle locking assembly between the handle locking state and the handle unlocking state.

[0086] In this way, when the user operates the handle unlocking assembly, the operating force is transmitted to the handle locking assembly, so that the pre-tightening force of the internal locking member is overcome, the constraint of the hinge point is released, and the handle unlocking state is entered. At this time, the connecting portion 420 can rotate relative to the wheel frame 100, and the user can push the holding portion 410 from above the rear wheel assembly 300 to between the front wheel assembly 200 and the rear wheel assembly 300, while the holding portion 410 descends from the first height to the second height, thereby completing the switching to the free pushing mode.

[0087] The structure of the handle locking assembly and the handle unlocking assembly is not specifically limited, and the handle hinge folding mechanism of the existing stroller can be used. The arrangement position of the handle unlocking assembly is also not limited in the present embodiment, which can be arranged on the holding portion 410 or the connecting portion 420.

[0088] For example, in the illustrated embodiment, the handle release assembly includes a pull 800 arranged on the connecting portion 420, and the rotation joint 450 is unlocked by pressing the left and right pull 800.

[0089] Third embodiment Reference Figure 13 And Figure 14 Unlike the second embodiment, in the present embodiment, the rotation joint 450 is not arranged, and the connecting portion 420 is directly fixed (for example, integrally connected, welded, etc.) with the wheel frame 100. At the same time, the holding portion 410 is also hinged with the connecting portion 420, and in the stroller pushing mode, the holding portion 410 is substantially parallel to the connecting portion 420, and the holding portion 410 is located above the connecting portion 420, which is convenient for the user to push. In the free pushing mode, the holding portion 410 is at an acute angle with the connecting portion 420, and the top end can move between the front wheel assembly 200 and the rear wheel assembly 300, or can be vertically directed to the ground under the action of gravity.

[0090] Fourth embodiment Reference Figure 15 And Figure 16 Unlike the third embodiment, in the present embodiment, the frame also has a canopy 900 for providing sunshade, rain protection or decoration function for the baby; the carrier is a seat for carrying children; at the same time, the frame is provided with two holding portions 410, which are a first handle 412 and a second handle 413, and the first handle 412 and the second handle 413 are hinged with the connecting portion 420, wherein the second handle 413 is selectively arranged on one of the wheel frame 100, the first handle 412, the seat or the canopy 900, and the rear wheel release assembly 700 is arranged on the second handle 413. Among them, the second handle 413 can be fixed or moved between the front wheel assembly 200 and the rear wheel assembly 300, and the upper end of the second handle 413 is arranged at an interval from the upper end of the first handle 412.

[0091] Fifth embodiment Reference Figures 17 to 19 Unlike the second embodiment, in the present embodiment, in order to realize that the height of the holding portion 410 can be lowered from the first height to the second height when it moves between the front wheel assembly 200 and the rear wheel assembly 300, the connecting portion 420 is arranged in a sliding fit with the rotation joint 450.

[0092] In detail, the rotation joint 450 is provided with a sliding hole penetrating through, and the connecting portion 420 is slidably arranged in the sliding hole, so as to realize the rotation and sliding of the connecting portion 420 relative to the wheel frame 100, so that the lifting of the holding portion 410 can be realized by sliding the connecting portion 420 downward.

[0093] Of course, in the embodiment where the connecting portion 420 is fixed relative to the wheel carrier 100, the connecting portion 420 can also be directly in sliding engagement with the wheel carrier 100, for example, a clasp is provided on the wheel carrier 100, and the connecting portion is slidable through the clasp.

[0094] Sixth Embodiment Reference Figure 20 And Figure 21 Unlike the fifth embodiment, in this embodiment, the connecting portion 420 itself is telescopic, so that the height of the holding portion 410 can be lowered from the first height to the second height when the holding portion 410 is moved between the front wheel assembly 200 and the rear wheel assembly 300.

[0095] Specifically, if the connecting portion 420 is a telescopic tube, it includes at least two nested tube bodies (e.g., an outer tube and an inner tube), and the length is adjusted by relative sliding. The inside can be integrated with a locking mechanism (e.g., a button 710 type buckle, a rotating locking sleeve, or a gas spring damper), which is used to position at different telescopic positions. In this way, the holding portion 410 can be raised or lowered by shortening or lengthening the telescopic tube.

[0096] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A frame for a children's vehicle, characterized in that, include: Wheel frame (100); The front wheel assembly (200) and the rear wheel assembly (300) are hinged to the wheel frame (100). A handlebar assembly (400) is disposed on the wheel frame (100). The handlebar assembly (400) includes a grip portion (410) which is switchable between a first height and a second height relative to a reference horizontal plane, wherein the second height is lower than the first height. The frame has a stroller pushing mode and a free pushing mode. In the stroller pushing mode, the grip (410) is at a first height relative to the reference horizontal plane. In the free-push mode, the grip (410) is at a second height, and the rear wheel assembly (300) is rotatable relative to the wheel frame (100).

2. The frame according to claim 1, characterized in that, In the free-push mode, the grip (410) is located between the front wheel assembly (200) and the rear wheel assembly (300).

3. The frame according to claim 1, characterized in that, During the process of switching from the stroller pushing mode to the free pushing mode, the grip (410) is lowered to the second height.

4. The frame according to claim 1, characterized in that, The handle assembly (400) also includes a connecting part (420), one end of which is connected to the wheel frame (100) and the other end of which is connected to the grip part (410).

5. The frame according to claim 4, characterized in that, The connecting part (420) is hinged to the wheel frame (100).

6. The frame according to claim 5, characterized in that, The connecting part (420) is a telescopic tube; or, The connecting part (420) slides with the wheel frame (100) so that the grip part (410) can switch between the first height and the second height relative to the wheel frame (100).

7. The frame according to claim 1, characterized in that, The frame also includes a rear wheel locking assembly (600) disposed between the rear wheel assembly (300) and the wheel frame (100), the rear wheel locking assembly (600) having a rear wheel locked state and a rear wheel unlocked state; In the rear wheel locked state, the rear wheel assembly (300) remains relatively fixed relative to the wheel frame (100); In the rear wheel unlocked state, the rear wheel assembly (300) is rotatable relative to the wheel frame (100); In the stroller pushing mode, the rear wheel locking assembly (600) is in the rear wheel locked state; In the free-push mode, the rear wheel locking assembly (600) is able to switch between the rear wheel locked state and the rear wheel unlocked state.

8. The frame according to claim 7, characterized in that, The rear wheel locking assembly (600) includes an elastic element (610) and a locking element (620). The locking element (620) is slidably disposed on the wheel frame (100) and connected to the elastic element (610). The elastic element (610) is connected to the wheel frame (100) and is used to give the locking element (620) a tendency to move toward the rear wheel assembly (300).

9. The frame according to claim 8, characterized in that, The rear wheel assembly (300) is provided with a socket (311), and the locking member (620) can extend into the socket (311) under the action of the elastic member (610).

10. The frame according to claim 7, characterized in that, The frame also includes a rear wheel release assembly (700) disposed on the grip (410), the rear wheel release assembly (700) being coupled to the rear wheel locking assembly (600); The rear wheel release assembly (700) is used to control the rear wheel locking assembly (600) to switch between the rear wheel locked state and the rear wheel release state.

11. The frame according to claim 10, characterized in that, The rear wheel release assembly (700) includes a rear wheel release operating component and a rear wheel cable; The rear wheel release mechanism is located on the grip (410) and is connected to the rear wheel locking assembly (600) via the rear wheel cable; The rear wheel release mechanism is used to pull the rear wheel cable to separate the rear wheel locking assembly (600) from the rear wheel assembly (300).

12. The frame according to claim 11, characterized in that, The gripping part (410) is a hollow tubular shape; The rear wheel release mechanism includes a button (710) and a rear wheel traction seat (730). The rear wheel traction seat (730) is slidably disposed within the gripping part (410); The button (710) is slidably fitted into the grip (410); When the button (710) is pressed, the rear wheel traction seat (730) moves along a direction at an angle to the pressing direction of the rear wheel release operation under the action of the button (710) to tighten the rear wheel cable.

13. The frame according to claim 12, characterized in that, The grip (410) is provided with a wedge (720), the wedge (720) has a wedge surface (721) at an acute angle to the pressing direction of the button (710), the wedge (720) is located between the button (710) and the rear wheel traction seat (730), the button (710) abuts against the wedge (720), and the wedge surface (721) slides against the rear wheel traction seat (730).

14. A frame for a children's vehicle, characterized in that, include: Wheel frame (100); The front wheel assembly (200) and the rear wheel assembly (300) are hinged to the wheel frame (100). A handlebar assembly (400) is disposed on the wheel frame (100), and the handlebar assembly (400) includes a grip portion (410). A rear wheel locking assembly (600) is disposed between the rear wheel assembly (300) and the wheel frame (100). The rear wheel locking assembly (600) has a rear wheel locked state and a rear wheel unlocked state. In the rear wheel locked state, the rear wheel assembly (300) remains relatively fixed relative to the wheel frame (100). In the rear wheel unlocked state, the rear wheel assembly (300) is rotatable relative to the wheel frame (100). The frame has a free-pushing mode in which the grip (410) is located between the front wheel assembly (200) and the rear wheel assembly (300) and enables the rear wheel locking assembly (600) to switch between the rear wheel locked state and the rear wheel unlocked state.

15. The frame according to claim 14, characterized in that, The handle assembly (400) also includes a connecting part (420), one end of which is hinged to the wheel frame (100) and the other end is connected to the grip part (410).

16. The frame according to claim 15, characterized in that, The grip (410) is hinged to the connecting part (420), and the grip (410) is movable between the front wheel assembly (200) and the rear wheel assembly (300).

17. The frame according to claim 14, characterized in that, The frame also includes a seat and / or roof (900) disposed on the wheel frame (100). The grip (410) includes a first handle (412) and a second handle (413), the second handle (413) being selectively provided on one of the wheel frame (100), the first handle (412), the seat, or the canopy (900); The second handle (413) can be fixed or moved between the front wheel assembly (200) and the rear wheel assembly (300), and the upper end of the second handle (413) is spaced apart from the upper end of the first handle (412).

18. The frame according to claim 14, characterized in that, The frame also has a stroller pushing mode, in which the rear wheel locking assembly (600) is in the rear wheel locking state; During the process of switching from the stroller push mode to the free push mode, the grip (410) moves between the front wheel assembly (200) and the rear wheel assembly (300), and the rear wheel locking assembly (600) switches to the rear wheel unlock state.

19. A frame for a children's vehicle, characterized in that, include: Wheel frame (100); The front wheel assembly (200) and the rear wheel assembly (300) are hinged to the wheel frame (100). A handlebar assembly (400) is disposed on the wheel frame (100). The handlebar assembly (400) includes a grip portion (410) which is switchable between a first height and a second height relative to a reference horizontal plane, wherein the second height is lower than the first height. A rear wheel locking assembly (600) is disposed between the rear wheel assembly (300) and the wheel frame (100). The rear wheel locking assembly (600) has a rear wheel locked state and a rear wheel unlocked state. In the rear wheel locked state, the rear wheel assembly (300) remains relatively fixed relative to the wheel frame (100). In the rear wheel unlocked state, the rear wheel assembly (300) is rotatable relative to the wheel frame (100). The frame has a free-pushing mode and a children's stroller pushing mode. In the free-pushing mode, the grip (410) is located at the second height and between the front wheel assembly (200) and the rear wheel assembly (300). The rear wheel locking assembly (600) can switch between the rear wheel locked state and the rear wheel unlocked state. In the stroller pushing mode, the grip (410) is located at the first height, and the rear wheel locking assembly (600) can switch between the rear wheel locked state and the rear wheel unlocked state.

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