Baby carriage frame

Abstract

A push rod assembly is arranged between a first frame assembly and a second frame assembly, the push rod assembly can move relative to the first frame assembly and the second frame assembly, the push rod assembly is connected with a first connecting rod and a second connecting rod, and the first connecting rod and the second connecting rod can rotate relative to the push rod assembly. When the push rod assembly moves relative to the first frame assembly and the second frame assembly, the first connecting rod can be drawn close to or unfolded relative to the first frame assembly, and the second connecting rod can be drawn close to or unfolded relative to the second frame assembly. A wheel support assembly capable of being unfolded or folded relative to the first connecting rod and the second connecting rod is arranged between the first connecting rod and the second connecting rod, and linkage assemblies are arranged between the wheel support assembly and the first frame assembly and between the wheel support assembly and the second frame assembly. The linkage assembly can drive the wheel support assembly to be unfolded or folded. The folding chair is convenient to fold.

Description

Technical field

[0001] The utility model relates to a children's bicycle frame. [Background Technology]

[0002] Strollers have become an indispensable accessory for children as they grow. While most strollers on the market can be folded or unfolded, existing strollers have complex transmission structures, numerous connecting rods, and are still relatively large when folded. Consequently, there is a strong desire for a stroller that is easy to fold and unfold. The present utility model provides a novel stroller structure. [Utility Model Content]

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a children's bicycle frame which is easy to fold.

[0004] The utility model is realized through the following technical solutions:

[0005] The folding mechanism is configured to move the first and second child frames of the child carrier from one another so that the folding mechanism can be moved toward and away from the first and second child frames when the folding mechanism is engaged.

[0006] A connecting assembly is provided between the first frame assembly and the second frame assembly, which can connect the two and enable the first frame assembly and the second frame assembly to move closer to or spread out from each other.

[0007] The first frame assembly includes a first supporting leg, the lower end of the first supporting leg is connected to the first wheel, the first supporting leg is connected to a third connecting rod capable of rotating relative to the first supporting leg around a third axis C away from the first wheel, and the third connecting rod is rotatably connected to the first connecting rod around a fifth axis E; the second frame assembly includes a second supporting leg, the lower end of the second supporting leg is connected to the second wheel, the second supporting leg is connected to a fourth connecting rod capable of rotating relative to the second supporting leg around a fourth axis D away from the second wheel, and the fourth connecting rod is rotatably connected to the second connecting rod around a sixth axis F.

[0008] The wheel bracket assembly includes a first connecting seat connected to the first connecting rod and a second connecting seat connected to the second connecting rod. A bracket body that can rotate relative to the first connecting seat and the second connecting seat is provided between the first connecting seat and the second connecting seat. The bracket body is also provided with multiple third wheels. The linkage assembly that can rotate relative to the third connecting rod and the fourth connecting rod is provided between the bracket body.

[0009] The linkage assembly includes a first linkage rod rotatably connected between the bracket body and the third connecting rod, one end of the first linkage rod is rotatably connected to the bracket body around the seventh axis G, and the other end of the first linkage rod is rotatably connected to the third connecting rod around the eighth axis H. The linkage assembly also includes a second linkage rod rotatably connected between the bracket body and the fourth connecting rod, one end of the second linkage rod is rotatably connected to the bracket body around the ninth axis I, and the other end of the second linkage rod is rotatably connected to the fourth connecting rod around the tenth axis J.

[0010] The connecting assembly includes a first cross assembly arranged on the push rod assembly, and when the child frame is folded, the first cross assembly can make the first frame assembly and the second frame assembly move closer to each other. The connecting assembly also includes a second cross assembly connected between the first connecting rod, the second connecting rod and the push rod assembly, and when the child frame is folded, the second cross assembly can make the first connecting rod and the second connecting rod move closer to each other.

[0011] The push rod assembly includes a first push rod movably connected to the first support leg and a second push rod movably connected to the second support leg. A handlebar rod that can rotate relative to the first push rod and the second push rod is provided between the first push rod and the second push rod. The first push rod and the handlebar rod rotate around the eleventh axis K, and the second push rod and the handlebar rod rotate around the twelfth axis (L). When the child frame is folded or unfolded, the first push rod can be rotated, folded or unfolded relative to the handlebar rod, and the second push rod can be rotated, folded or unfolded relative to the handlebar rod.

[0012] The first cross assembly includes a first rotating rod and a second rotating rod that cross each other and are rotatably connected. One end of the first rotating rod is rotatably connected to the first push rod around the thirteenth axis M, and the other end of the first rotating rod is rotatably connected to the second support leg around the fourteenth axis N. The second rotating rod is rotatably connected to the second push rod around the fifteenth axis O, and the other end of the first rotating rod is rotatably connected to the first support leg around the sixteenth axis P.

[0013] The second cross component includes a first sliding sleeve and a second sliding sleeve slidingly connected to the first connecting rod and the second connecting rod. The second cross component also includes a third rotating rod and a fourth rotating rod that are crossed and rotatably connected to each other. One end of the third rotating rod is rotatably connected to the second sliding sleeve around the seventeenth axis T, and the other end of the first rotating rod is rotatably connected to the first connecting rod around the eighteenth axis Q. The fourth rotating rod is rotatably connected to the first sliding sleeve around the nineteenth axis S, and the other end of the fourth rotating rod is rotatably connected to the second connecting rod around the twentieth axis R.

[0014] The support body includes a wheel frame, a first support rod capable of rotating relative to the wheel frame and the first connecting seat is provided between the wheel frame and the first connecting seat, and a second support rod capable of rotating relative to the wheel frame and the second connecting seat is provided between the wheel frame and the second connecting seat.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. When the present invention needs to be folded, the locking device is first unlocked, and then the push rod assembly is pushed to slide along the first frame assembly and the second frame assembly. At this time, the first connecting rod rotates around the first axis relative to the push rod assembly and the first frame assembly, and at the same time, the second connecting rod rotates around the second axis relative to the push rod assembly and the second frame assembly, so that the first connecting rod and the second connecting rod move closer to the first frame assembly and the second frame assembly. When the first frame assembly and the second frame assembly are active, the wheel bracket assembly moves closer to the first frame assembly and the second frame assembly through the linkage assembly, thereby completely folding the child stroller frame. The user only needs to unlock the locking device and push the push rod assembly to slide along the first frame assembly and the second frame assembly to complete the folding of the entire stroller, which is easy to operate.

[0017] 2. When the first push rod and the second push rod slide downward, the first push rod and the second push rod push the rear ends of the first connecting rod and the second connecting rod downward, causing the first connecting rod to rotate relative to the first push rod, the second connecting rod to rotate relative to the second push rod, and the front ends of the first and second connecting rods to tilt upward. During this process, the upper end of the third connecting rod rotates relative to the first support leg, the upper end of the fourth connecting rod rotates relative to the second support leg, and the lower end of the third connecting rod pulls the first support rod relative to the first connecting rod through the first linkage rod to rotate and move closer together. The lower end of the fourth connecting rod pulls the second support rod relative to the second connecting rod to rotate and move closer together through the second linkage rod. At this time, the first support rod, the first linkage rod, the third connecting rod, the first connecting rod, and the first support leg are brought together, and the second support rod, the second linkage rod, the fourth connecting rod, the second connecting rod, and the second support leg are brought together. In addition, during this process, the first frame assembly and the second frame assembly are also brought together in the left and right lateral directions due to the movement of the first cross assembly and the second cross assembly. The entire child stroller frame is compact when folded, making it easy to carry.

Brief Description of the Drawings

[0018] Figure 1 This is one of the three-dimensional diagrams of the utility model;

[0019] Figure 2 This is the second stereogram of the present utility model;

[0020] Figure 3 This is a side view of the utility model in the expanded state;

[0021] Figure 4 This is one of the side views of the utility model during the folding process;

[0022] Figure 5 This is the second side view of the utility model during the folding process;

[0023] Figure 6 It is a three-dimensional diagram of the utility model during the folding process;

[0024] Figure 7 It is a three-dimensional diagram of the utility model in a folded state. [Specific implementation method]

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] like Figures 1 to 7As shown, a child stroller frame can be moved from an unfolded position to a folded position after an unlocking and locking device is unlocked, comprising a first frame assembly 1 and a second frame assembly 2 arranged at intervals, a push rod assembly 3 that can be connected to the first frame assembly 1 and the second frame assembly 2 is provided between the first frame assembly 1 and the second frame assembly 2, and after the locking device is unlocked, the push rod assembly 3 can move relative to the first frame assembly 1 and the second frame assembly 2, and the push rod assembly 3 is connected to a first connecting rod 41 that can rotate relative to the push rod assembly 3 around a first axis A and a second connecting rod 42 that rotates around a second axis B. When the push rod assembly 3 moves relative to the first frame assembly 1 and the second frame assembly 2, the push rod assembly 3 can move relative to the first frame assembly 1 and the second frame assembly 2. The first connecting rod 41 moves closer to or unfolds relative to the first frame assembly 1, and can make the second connecting rod 42 move closer to or unfold relative to the second frame assembly 2. A wheel bracket assembly 5 that can be movably expanded or folded relative to the first connecting rod 41 and the second connecting rod 42 is provided between the first connecting rod 41 and the second connecting rod 42. A linkage assembly 6 is provided between the wheel bracket assembly 5 and the first frame assembly 1 and the second frame assembly 2. When the first connecting rod 41 and the second connecting rod 42 move relative to the first frame assembly 1, the second frame assembly 2 and the push rod assembly 3, the linkage assembly 6 can drive the wheel bracket assembly 5 to expand or move closer to and fold toward the first frame assembly 1 and the second frame assembly 2. When the child stroller frame needs to be folded, the locking device is first unlocked. Then, the push rod assembly 3 is pushed along the first frame assembly 1 and the second frame assembly 2 to push the rear ends of the first connecting rod 41 and the second connecting rod 42 downward. At this time, the first connecting rod 41 rotates relative to the push rod assembly 3 and the first frame assembly 1 about the first axis, and the second connecting rod 42 rotates relative to the push rod assembly 3 and the second frame assembly 2 about the second axis, causing the first connecting rod 41 and the second connecting rod 42 to move closer to the first frame assembly 1 and the second frame assembly 2. When the first frame assembly 1 and the second frame assembly 2 are moved, the linkage assembly 6 causes the wheel bracket assembly 5 to move closer to the first frame assembly 1 and the second frame assembly 2, thereby completely folding the child stroller frame. After unlocking the locking device, the user only needs to push the push rod assembly 3 to slide along the first frame assembly 1 and the second frame assembly 2 to complete the folding of the child stroller frame, which is convenient to operate. The locking device can adopt a locking structure with a latch and a latch hole provided between the push rod assembly 3 and the first frame assembly 1 and the second frame assembly 2, or other conventional locking structures, which will not be described in detail here.

[0027] like Figure 1 and Figure 2 As shown, a connecting component 7 is provided between the first frame assembly 1 and the second frame assembly 2, which can connect the two and make the first frame assembly 1 and the second frame assembly 2 move closer to or unfold each other, so that the child frame can be folded or unfolded in the left and right lateral directions, making the child frame smaller in size after folding and more convenient to carry.

[0028] like Figures 1 to 7As shown, the first frame assembly 1 includes a first support leg 11, the lower end of the first support leg 11 is connected to the first wheel 12, the first support leg is connected to a third connecting rod 13 that can rotate relative to the first wheel 12 around a third axis C, and the third connecting rod 13 is rotatably connected to the first connecting rod 41 around a fifth axis E; the second frame assembly 2 includes a second support leg 21, the lower end of the second support leg 21 is connected to the second wheel 22, and the second support leg is connected to a fourth connecting rod that can rotate relative to the second wheel 22 around a fourth axis D. The connecting rod 23, the fourth connecting rod 23 is rotatably connected to the second connecting rod 42 around the sixth axis F; the wheel bracket assembly 5 includes a first connecting seat 51 connected to the first connecting rod 41 and a second connecting seat 52 connected to the second connecting rod 42, and a bracket body 53 capable of rotating relative to the first connecting seat 51 and the second connecting seat 52 is provided between the first connecting seat 51 and the second connecting seat 52, and the bracket body 53 is also provided with multiple third wheels 54, and the linkage assembly 6 capable of rotating relative to the third connecting rod 13 and the fourth connecting rod 23 is provided between the bracket body 53. When the push rod assembly 3 slides downward, the push rod assembly 3 pushes the rear ends of the first connecting rod 41 and the second connecting rod 42 to slide downward, and the first connecting rod 41 and the second connecting rod 42 rotate relative to the push rod assembly 3, and the front ends of the first connecting rod 41 and the second connecting rod 42 tilt upward. During this process, the upper end of the third connecting rod 13 rotates relative to the first support leg 11, and the upper end of the fourth connecting rod 23 rotates relative to the second support leg 21. The lower ends of the third connecting rod 13 and the fourth connecting rod 23 pull the bracket body 53 toward the first connecting rod 41 and the second connecting rod 42 through the linkage assembly 6. At this time, the bracket body 53, the linkage assembly 6, the third connecting rod 13, the first connecting rod 41 and the first support leg 11 are brought together, and the bracket body 53, the linkage assembly 6, the fourth connecting rod 23, the second connecting rod 42 and the second support leg 21 are also brought together. The entire folding operation is convenient and fast, and the folding and retraction are flexible.

[0029] like Figures 1 to 5As shown, the linkage assembly 6 includes a first linkage rod 61 rotatably connected between the bracket body 53 and the third connecting rod 13, one end of the first linkage rod 61 is rotatably connected to the bracket body 53 around the seventh axis G, and the other end of the first linkage rod 61 is rotatably connected to the third connecting rod 13 around the eighth axis H. The linkage assembly 6 also includes a second linkage rod 62 rotatably connected between the bracket body 53 and the fourth connecting rod 23, one end of the second linkage rod 62 is rotatably connected to the bracket body 53 around the ninth axis I, and the other end of the second linkage rod 62 is rotatably connected to the fourth connecting rod 23 around the tenth axis J. The bracket body 53 includes a wheel frame 531, and a first bracket rod 532 that can rotate relative to the first connecting seat 51 is provided between the wheel frame 531 and the first connecting seat 51, and a second bracket rod 533 that can rotate relative to the second connecting seat 52 is provided between the wheel frame 531 and the second connecting seat 52. When the upper end of the third connecting rod 13 rotates relative to the first supporting leg 11, the lower end of the third connecting rod 13 rotates relative to the first linkage rod 61 and pulls the first bracket rod 532 to rotate relative to the first connecting rod 41 through the first linkage rod 61, thereby making the first bracket rod 532 move closer to the first connecting rod 41. Similarly, the fourth connecting rod 23 pulls the second bracket rod 533 closer to the second connecting rod 42 through the second linkage rod 62.

[0030] like Figures 1 to 7 As shown, the connecting assembly 7 includes a first cross assembly 71 arranged on the push rod assembly 3, and when the child frame is folded, the first cross assembly 71 can make the first frame assembly 1 and the second frame assembly 2 move closer to each other. The connecting assembly 7 also includes a second cross assembly 72 connected between the first connecting rod 41, the second connecting rod 42 and the push rod assembly 3, and when the child frame is folded, the second cross assembly 72 can make the first connecting rod 41 and the second connecting rod 42 move closer to each other, thereby ensuring that the child frame can be folded in the front and rear directions while also being folded in the left and right lateral directions, further reducing the volume after folding and making it easier to carry.

[0031] like Figures 1 to 5As shown, the push rod assembly 3 includes a first push rod 31 movably connected to the first support leg 11 and a second push rod 32 movably connected to the second support leg 21. A handlebar 33 that can rotate relative to the first push rod 31 and the second push rod 32 is provided between the first push rod 31 and the second push rod 32. The first push rod 31 and the handlebar 33 rotate about an eleventh axis K, and the second push rod 32 and the handlebar 33 rotate about a twelfth axis L. When the child stroller frame is folded or unfolded, the first push rod 31 can be rotated relative to the handlebar 33 to fold or unfold, and the second push rod 32 can be rotated relative to the handlebar 33 to fold or unfold. The handlebar 33 is convenient for the user to grasp and push, and is rotatably connected to the first push rod 31 and the second push rod 32, so that the child stroller frame can be folded in the left and right lateral directions.

[0032] like Figure 1 、 Figure 2 、 Figure 6 and Figure 7 As shown, the first cross assembly 71 includes a first rotating rod 711 and a second rotating rod 712 that cross and are rotatably connected to each other, one end of the first rotating rod 711 is rotatably connected to the first push rod 31 around the thirteenth axis M, the other end of the first rotating rod 711 is rotatably connected to the second support leg 21 around the fourteenth axis N, the second rotating rod 712 is rotatably connected to the second push rod 32 around the fifteenth axis O, the other end of the first rotating rod 711 is rotatably connected to the first support leg 11 around the sixteenth axis P, and the second cross assembly 72 includes a first connecting rod 41 that is slidably connected to the first connecting rod 41 And the first sliding sleeve 721 and the second sliding sleeve 722 on the second connecting rod 42, the second cross component 72 also includes a third rotating rod 723 and a fourth rotating rod 724 that cross each other and are rotatably connected, one end of the third rotating rod 723 is rotatably connected to the second sliding sleeve 722 around the seventeenth axis T, the other end of the first rotating rod 711 is rotatably connected to the first connecting rod 41 around the eighteenth axis Q, the fourth rotating rod 724 is rotatably connected to the first sliding sleeve 721 around the nineteenth axis S, and the other end of the fourth rotating rod 724 is rotatably connected to the second connecting rod 42 around the twentieth axis R. When the first push rod 31 and the second push rod 32 slide downward, the first push rod 31 pushes the lower end of the first rotating rod 711 to move downward, and the second push rod 32 pushes the lower end of the second rotating rod 712 to move downward. The first rotating rod 711 and the second rotating rod 712 rotate relative to each other and the angle between the two decreases. At the same time, the rear ends of the third rotating rod 723 and the fourth rotating rod 724 are also pushed and move downward. The first sliding sleeve 721 slides on the first connecting rod 41, and the second sliding sleeve 722 slides on the second connecting rod 42. The third rotating rod 723 and the fourth rotating rod 724 rotate relative to each other and the angle between the two also decreases, so that the child frame can be folded in the front and rear directions while also being folded in the left and right lateral directions.

[0033] The embodiment is described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiment. Various changes can be made within the knowledge of ordinary technicians in the technical field without departing from the present invention.

Claims

1. A child stroller frame capable of moving from an unfolded position to a folded position after an unlocking locking device is unlocked, characterized in that: The invention comprises a first frame assembly (1) and a second frame assembly (2) arranged at an interval, wherein a push rod assembly (3) capable of connecting with the first frame assembly (1) and the second frame assembly (2) is provided between the first frame assembly (1) and the second frame assembly (2), and after a locking device is unlocked, the push rod assembly (3) can move relative to the first frame assembly (1) and the second frame assembly (2), and the push rod assembly (3) is connected to a first connecting rod (41) capable of rotating relative to the push rod assembly around a first axis (A) and a second connecting rod (42) rotating around a second axis (B), and when the push rod assembly (3) moves relative to the first frame assembly (1) and the second frame assembly (2), the first connecting rod (41) can be rotated relative to the first frame assembly (1). The first and second connecting rods (41 and 42) are configured to move closer to or unfold relative to each other and to enable the second connecting rod (42) to move closer to or unfold relative to the second frame assembly (2). A wheel bracket assembly (5) is provided between the first connecting rod (41) and the second connecting rod (42) and is capable of being movably unfolded or folded relative to the two. A linkage assembly (6) is provided between the wheel bracket assembly (5) and the first and second frame assemblies (1 and 2). When the first connecting rod (41) and the second connecting rod (42) move relative to the first and second frame assemblies (1), (2) and the push rod assembly (3), the linkage assembly (6) can drive the wheel bracket assembly (5) to unfold or move closer to and fold towards the first and second frame assemblies (1 and 2).

2. The child bicycle frame according to claim 1, characterized in that: A connecting assembly (7) is provided between the first frame assembly (1) and the second frame assembly (2), which is capable of connecting the two and allowing the first frame assembly (1) and the second frame assembly (2) to move closer to or spread out from each other.

3. The child bicycle frame according to claim 2, characterized in that: The first frame assembly (1) includes a first supporting leg (11), the lower end of the first supporting leg (11) is connected to a first wheel (12), the first supporting leg is connected to a third connecting rod (13) at a position away from the first wheel (12) and can rotate relative to the first wheel (12) around a third axis (C), and the third connecting rod (13) is rotatably connected to the first connecting rod (41) around a fifth axis (E); The second frame assembly (2) includes a second supporting leg (21), the lower end of the second supporting leg (21) is connected to a second wheel (22), and the second supporting leg is connected to a fourth connecting rod (23) capable of rotating relative to the second wheel (22) around a fourth axis (D) away from the second wheel (22), and the fourth connecting rod (23) is rotatably connected to the second connecting rod (42) around a sixth axis (F).

4. The child bicycle frame according to claim 3, characterized in that: The wheel bracket assembly (5) includes a first connecting seat (51) connected to a first connecting rod (41) and a second connecting seat (52) connected to a second connecting rod (42); a bracket body (53) capable of rotating relative to the first connecting seat (51) and the second connecting seat (52) is provided between the first connecting seat (51) and the second connecting seat (52); the bracket body (53) is further provided with a plurality of third wheels (54); and a linkage assembly (6) capable of rotating relative to the third connecting rod (13) and the fourth connecting rod (23) is provided between the bracket body (53).

5. The child bicycle frame according to claim 4, characterized in that: The linkage assembly (6) includes a first linkage rod (61) rotatably connected between the bracket body (53) and the third connecting rod (13), one end of the first linkage rod (61) is rotatably connected to the bracket body (53) around a seventh axis (G), and the other end of the first linkage rod (61) is rotatably connected to the third connecting rod (13) around an eighth axis (H). The linkage assembly (6) also includes a second linkage rod (62) rotatably connected between the bracket body (53) and the fourth connecting rod (23), one end of the second linkage rod (62) is rotatably connected to the bracket body (53) around a ninth axis (I), and the other end of the second linkage rod (62) is rotatably connected to the fourth connecting rod (23) around a tenth axis (J).

6. The child bicycle frame according to claim 3, characterized in that: The connecting assembly (7) includes a first cross assembly (71) arranged on the push rod assembly (3), and when the child frame is folded, the first cross assembly (71) can make the first frame assembly (1) and the second frame assembly (2) move closer to each other. The connecting assembly (7) also includes a second cross assembly (72) connected between the first connecting rod (41), the second connecting rod (42) and the push rod assembly (3), and when the child frame is folded, the second cross assembly (72) can make the first connecting rod (41) and the second connecting rod (42) move closer to each other.

7. The child bicycle frame according to claim 6, characterized in that: The push rod assembly (3) includes a first push rod (31) movably connected to the first support leg (11) and a second push rod (32) movably connected to the second support leg (21); a handlebar (33) capable of rotating relative to the first push rod (31) and the second push rod (32); the first push rod (31) and the handlebar (33) rotate around an eleventh axis (K); the second push rod (32) and the handlebar (33) rotate around a twelfth axis (L); and when the child frame is folded or unfolded, the first push rod (31) can be rotated, folded or unfolded relative to the handlebar (33), and the second push rod (32) can be rotated, folded or unfolded relative to the handlebar (33).

8. The method according to claim 6 or 7, wherein: The first cross assembly (71) includes a first rotating rod (711) and a second rotating rod (712) that cross each other and are rotatably connected. One end of the first rotating rod (711) is rotatably connected to the first push rod (31) around a thirteenth axis (M), and the other end of the first rotating rod (711) is rotatably connected to the second support leg (21) around a fourteenth axis (N). The second rotating rod (712) is rotatably connected to the second push rod (32) around a fifteenth axis (O), and the other end of the first rotating rod (711) is rotatably connected to the first support leg (11) around a sixteenth axis (P).

9. The method according to claim 8, wherein: The second cross component (72) includes a first sliding sleeve (721) and a second sliding sleeve (722) that are slidably connected to the first connecting rod (41) and the second connecting rod (42). The second cross component (72) also includes a third rotating rod (723) and a fourth rotating rod (724) that are crossed and rotatably connected to each other. One end of the third rotating rod (723) is rotatably connected to the second sliding sleeve (722) around the seventeenth axis (T), and the other end of the first rotating rod (711) is rotatably connected to the first connecting rod (41) around the eighteenth axis (Q). The fourth rotating rod (724) is rotatably connected to the first sliding sleeve (721) around the nineteenth axis (S), and the other end of the fourth rotating rod (724) is rotatably connected to the second connecting rod (42) around the twentieth axis (R).

10. The method according to claim 4, wherein: The support body (53) includes a wheel frame (531), a first support rod (532) capable of rotating relative to the wheel frame (531) and the first connecting seat (51), and a second support rod (533) capable of rotating relative to the wheel frame (531) and the second connecting seat (52).

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