Trailer frame and trailer

Abstract

The utility model discloses a trailer frame and a trailer, and belongs to the technical field of child trailers, the trailer frame comprises an enclosure frame assembly and an underframe assembly, the enclosure frame assembly is provided with a first enclosure rod, and the underframe assembly is provided with a second enclosure rod; the bottom frame assembly comprises a first support, a second support arranged on the first support, a first wheel set arranged on the first support and a second wheel set arranged on the second support, the first support is provided with an extending part arranged on the plane where the first surrounding rod is located in an extending mode, and the first surrounding rod is arranged on the extending part; the bottom frame assembly further comprises a supporting structure supported between the first surrounding rod and the second support. The trailer comprises the trailer frame. Due to the fact that the extending part extends in the plane where the first surrounding rod is located, the structure is simplified while the first surrounding rod is supported, the occupied space is small, and good supporting stability is guaranteed. The bottom frame assembly further comprises a supporting structure supported between the first surrounding rod and the second support, the supporting structure and the extending part are matched to support the first surrounding rod, and the stability is further guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of children's trailer technology, and in particular to a trailer frame and trailer. Background Technology

[0002] Child trailers are widely used as a means of transportation for children. Most existing child trailers have a folding function and generally include a trailer frame, wheels installed under the frame, a locking device that can lock the frame in the open position, and a seat installed on the frame for the child to sit in.

[0003] The trailer frame has two side rails, and mounting seats are usually provided between the side rails, the front frame and the rear frame. The side rails, the front frame and the rear frame are all supported by the mounting seats, which makes the structure complex and the support stability poor. Utility Model Content

[0004] The purpose of this utility model is to provide a trailer frame and trailer to solve the technical problem of poor support stability of the trailer frame in the prior art.

[0005] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0006] A trailer frame, comprising:

[0007] A perimeter assembly having a first perimeter bar;

[0008] The base frame assembly includes a first bracket, a second bracket disposed on the first bracket, a first wheel set disposed on the first bracket, and a second wheel set disposed on the second bracket. The first bracket has an extension portion extending into the plane of the first guardrail, and the first guardrail is disposed on the extension portion. The base frame assembly also includes a support structure supporting the first guardrail and the second bracket.

[0009] Preferably, the extension extends in the plane of the first railing and is part of the frame assembly.

[0010] Preferably, the trailer frame has an unfolded state and a folded state;

[0011] In the unfolded state, the second bracket is rotatably connected to the first bracket about the first axis, and the first arm is rotatably connected to the extension about the second axis.

[0012] The two ends of the support structure are respectively movably connected to the second bracket and the first retaining rod;

[0013] During the transition from the unfolded state to the folded state, the second bracket rotates toward the first bracket, and the support structure moves toward the second bracket, causing the first enclosure rod to rotate toward the second bracket.

[0014] Preferably, the frame assembly also has a second rail rotatably connected to at least one of the extension and the first rail, and when folded, the second rail rotates toward the first support.

[0015] Preferably, the second rod is rotatably engaged with the extension about a third axis, and the second rod is disposed inside the extension so that, in the folded state, the second rod is housed within the first bracket.

[0016] Preferably, the trailer frame further includes a linkage mechanism, which includes connecting rods that are movably connected to the second support and the second retaining rod respectively; when the second support moves closer to the first support, the linkage mechanism drives the second retaining rod to move closer to the first support.

[0017] Preferably, one end of the connecting rod is rotatably connected to the second bracket, and the other end of the connecting rod is rotatably connected to the second retaining rod;

[0018] Alternatively, one of the second bracket and the second retaining rod is slidably connected to the connecting rod, and the other is rotatably connected to the connecting rod.

[0019] Preferably, the connection point between the second bracket and the first bracket is located on the lower side of the extension and is positioned relative to each other near the top of the first bracket;

[0020] And / or, along the longitudinal direction of the trailer frame, the second axis is located at the midpoint between the first axis and the connection point between the support structure and the first guardrail.

[0021] Preferably, a locking mechanism is also included, which is disposed on the extension and used to lock the enclosure assembly. When the locking mechanism is in the unlocked state, the first enclosure rod can rotate toward the first support.

[0022] A trailer includes a seating assembly and a trailer frame as described above, the frame assembly being used to support the seating assembly.

[0023] The beneficial effects of this utility model are:

[0024] The trailer frame proposed in this utility model provides support for the first and second wheel sets, which in turn support the first and second supports. The first support has an extension portion extending into the plane of the first retaining rod, with the first retaining rod disposed within the extension portion. Because the extension portion extends into the plane of the first retaining rod, it simplifies the structure, occupies less space, and ensures better support stability while supporting the first retaining rod. The underframe assembly also includes a support structure supporting the first retaining rod and the second support. Both the support structure and the extension portion work together to provide support for the first retaining rod, further ensuring stability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the trailer in the unfolded state provided in this embodiment of the utility model;

[0026] Figure 2 This is a partial structural diagram of the trailer in the unfolded state provided in this embodiment of the utility model;

[0027] Figure 3 yes Figure 2 Enlarged view of point A;

[0028] Figure 4 This is a partial structural schematic diagram of the trailer frame provided in this embodiment of the utility model;

[0029] Figure 5 This is a schematic diagram of the trailer in a folded state according to an embodiment of the present invention;

[0030] Figure 6 yes Figure 5 Enlarged view of point B.

[0031] In the picture:

[0032] 101. First axis; 102. Second axis; 103. Third axis; 104. Fourth axis; 105. Fifth axis; 106. Sixth axis; 107. Seventh axis;

[0033] 11. First bracket; 111. Extension; 112. Support; 1121. First support rod; 1122. First crossbar; 113. First lug; 12. Second bracket; 121. Bracket body; 1211. Second support rod; 1212. Second crossbar; 122. Bracket extension rod; 13. First wheel set; 14. Second wheel set; 15. Support structure;

[0034] 21. First retaining wall; 22. Second retaining wall;

[0035] 31. Linkage mechanism;

[0036] 41. Locking mechanism;

[0037] 100. Push handle assembly. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] See Figures 1 to 6 This embodiment provides a trailer, which includes a seat assembly, a trailer frame, and a push handle assembly 100. The trailer frame supports the seat assembly, and the push handle assembly 100 is located on the front side of the trailer frame to facilitate pulling the trailer, thereby defining the trailer's vertical, forward / backward, and horizontal directions. In other embodiments, the push handle assembly 100 may also be located on the rear, left, or right side of the trailer frame, which will not be elaborated further here.

[0043] The trailer frame includes a frame assembly and a chassis assembly. The frame assembly has a first rail 21. The chassis assembly includes a first bracket 11, a second bracket 12 disposed on the first bracket 11, a first wheel set 13 disposed on the first bracket 11, and a second wheel set 14 disposed on the second bracket 12. The first bracket 11 has an extension 111 extending into the plane of the first rail 21. The first rail 21 is disposed in the extension 111. The chassis assembly also includes a support structure 15 supporting the first rail 21 and the second bracket 12.

[0044] The first wheel assembly 13 and the second wheel assembly 14 provide support for the first support 11 and the second support 12. The first support 11 has an extension 111 extending into the plane of the first retaining rod 21. The first retaining rod 21 is disposed in the extension 111. Since the extension 111 extends into the plane of the first retaining rod 21, it simplifies the structure, occupies less space, and ensures better support stability while supporting the first retaining rod 21. The base frame assembly also includes a support structure 15 supporting the first retaining rod 21 and the second support 12. The support structure 15 and the extension 111 cooperate to provide support for the first retaining rod 21, further ensuring stability. Specifically, the frame assembly is used to support the seat assembly, and the seat assembly can be an existing seat assembly.

[0045] In some embodiments, the first retaining rod 21 forms a closed accommodating space, with support provided by the extension 111. The first retaining rod 21 facilitates the support of other components such as the seat, making the first retaining rod 21 more stable. In some embodiments, the extension 111 extends into the plane of the first retaining rod 21 and is part of the frame assembly. The first retaining rod 21 and the extension 111 may form a closed accommodating space; the first retaining rod 21 may be an integral structure or a separate structure. Alternatively, the frame assembly may also include a second retaining rod 22, which is disposed on the extension 111, and the first retaining rod 21, the second retaining rod 22, and the extension 111 together form a closed accommodating space.

[0046] The trailer frame has an unfolded state and a folded state; in the unfolded state, the second bracket 12 is rotatably connected to the first bracket 11 about the first axis 101, and the first retaining rod 21 is rotatably connected to the extension 111 about the second axis 102; the two ends of the support structure 15 are movably connected to the second bracket 12 and the first retaining rod 21, respectively.

[0047] During the transition from the unfolded state to the folded state, the second support 12 rotates toward the first support 11, and the support structure 15 moves toward the second support 12, causing the first surrounding rod 21 to rotate toward the second support 12.

[0048] When folding, the second support 12 can be pushed towards the first support 11, which in turn causes the first retaining rod 21 to move towards the second support 12 via the support structure 15; alternatively, the first retaining rod 21 can be pressed down to push the support structure 15, which in turn causes the second support 12 to move towards the first support 11. When unfolding, the second support 12 can be pushed away from the first support 11, causing the support structure 15 to move away from the second support 12. Alternatively, the first retaining rod 21 can be pulled away from the second support 12. Figure 1 and Figure 2 The hollow arrow indicates the folding direction of the trailer.

[0049] The support structure 15 is movably connected to the second bracket 12 and the first retaining rod 21 respectively. The movable connection can be a rotational connection or a sliding connection.

[0050] In this embodiment, one end of the support structure 15 is rotatably connected to the second bracket 12, and the other end of the support structure 15 is rotatably connected to the first retaining rod 21. Specifically, one end of the second bracket 12 is provided with a second wheel set 14, and the other end of the second bracket 12 is rotatably connected to the first bracket 11. The rotatable connection position between the support structure 15 and the second bracket 12 is close to the middle of the second bracket 12. In the unfolded state, the rotatable connection position between the support structure 15 and the first retaining rod 21 is located behind the rotatable connection position between the first retaining rod 21 and the extension 111.

[0051] When folded or unfolded, the support structure 15 rotates both relative to the second bracket 12 and relative to the first retaining rod 21, thereby causing the first retaining rod 21 to retract towards the second bracket 12. Both ends of the support structure 15 are rotatably configured, so that the first bracket 11, the second bracket 12, the first retaining rod 21, and the support structure 15 form a four-bar linkage mechanism, providing stable support.

[0052] Specifically, the second bracket 12 is rotatably connected to the first bracket 11 about the first axis 101, the first retaining rod 21 is rotatably connected to the extension 111 about the second axis 102, one end of the support structure 15 is rotatably connected to the second bracket 12 about the fourth axis 104, and the other end of the support structure 15 is rotatably connected to the first retaining rod 21 about the fifth axis 105. The first axis 101, the second axis 102, the fourth axis 104 and the fifth axis 105 are the four axes of the four-bar linkage.

[0053] Along the longitudinal direction of the trailer frame, the second axis 102 is located at the midpoint between the first axis 101 and the connection point between the support structure 15 and the first retaining rod 21. This ensures the length of each link in the four-bar linkage, making the support more stable.

[0054] The support structure 15 can be rod-shaped, straight, or bent. Using straight rods reduces space requirements and avoids interference with other components.

[0055] The second bracket 12 is connected to the first bracket 11 at the lower side of the extension 111 and is positioned relative to it near the top of the first bracket 11. This results in a flatter, smaller size when folded, reducing space usage.

[0056] Specifically, the first support 11 also includes a support portion 112, an extension portion 111 disposed at one end of the support portion 112, and a first wheel assembly 13 disposed at the other end of the support portion 112. In the unfolded state, the support portion 112 extends inclinedly along a relatively horizontal plane, and the support portion 112 has a top and a bottom disposed opposite to each other. The first wheel assembly 13 is disposed at the bottom of the support portion 112, and the extension portion 111 is disposed at the top of the support portion 112, extending from the top of the support portion 112 and intersecting with the support portion 112.

[0057] The support portion 112 and the extension portion 111 intersect and extend at an obtuse angle to avoid sharp corners, allowing the support portion 112 and the extension portion 111 to bend smoothly, further ensuring stable and balanced force distribution. In other embodiments, the support portion 112 and the extension portion 111 are connected in a T-shape, with the extension portion 111 located at the top of the support portion 112 and extending to the front and rear sides of the support portion 112.

[0058] In the unfolded state, the extension 111 extends horizontally and is located above the second support 12. Vertically, the second support 12 does not extend beyond the extension 111, resulting in a compact structure and minimal space occupation. Taking the first support 11 as the front support and the second support 12 as the rear support as an example, in the unfolded state, the support 112 extends upwards and backwards at an angle, while the extension 111 extends horizontally backwards from the top of the support 112. In the unfolded state, the second support 12 extends upwards and backwards at an angle. The arrangement of the first support 11 and the second support 12 makes full use of space and ensures structural stability.

[0059] The second bracket 12 is rotatably connected to the support part 112 via a rotating shaft. The rotating shaft is positioned near the top of the support part 112, making the top of the second bracket 12 close to the top of the support part 112. This results in a flatter, smaller size after folding, reducing space occupation. Taking the first bracket 11 as the front bracket and the second bracket 12 as the rear bracket as an example, the second bracket 12 is located behind the support part 112.

[0060] In this embodiment, the support portion 112 and the extension portion 111 are integrally formed, which facilitates processing and production and reduces the number of parts. In other embodiments, the support portion 112 and the extension portion 111 are detachably connected, which facilitates replacement and maintenance.

[0061] like Figure 2 and Figure 4As shown, the support portion 112 is U-shaped, and the extension portion 111 is disposed at both ends of the support portion 112. Specifically, the support portion 112 includes first support rods 1121 disposed on the left and right sides respectively, and first crossbars 1122 disposed at the bottom of the two first support rods 1121. The extension portion 111 is disposed at the ends of the two first support rods 1121 away from the first crossbars 1122.

[0062] In this embodiment, the frame assembly further includes a second rail 22 rotatably connected to at least one of the extension 111 and the first rail 21. When folded, the second rail 22 rotates towards the first support 11. Alternatively, the first rail 21 may be rotatably connected to the extension 111, and the second rail 22 may be rotatably connected to the first rail 21; or both the first rail 21 and the second rail 22 may be rotatably connected to the extension 111. The first rail 21 and the second rail 22 may rotate about the same axis or about two spaced-apart axes.

[0063] like Figure 3 As shown, the first support rod 21 is rotatably connected to the extension 111 about the second axis 102, and the second support rod 22 is rotatably connected to the extension 111 about the third axis 103. The second axis 102 and the third axis 103 are parallel and spaced apart. Specifically, the first support rod 21 is located at the end of the extension 111 away from the support 112, and the second support rod 22 is located at the end of the extension 111 close to the support 112. The top of the second bracket 12 is rotatably connected to the top of the support 112, thus making the distance between the first axis 101 and the second axis 102 larger, further ensuring stability.

[0064] Specifically, the second retaining rod 22 is rotatably engaged with the extension 111 around the third axis 103. The second retaining rod 22 is disposed inside the extension 111 so that, in the folded state, the second retaining rod 22 is housed within the first bracket 11. This results in a flatter, smaller size after folding, reducing space occupation.

[0065] In this embodiment, both the first retaining rod 21 and the second retaining rod 22 have a U-shaped structure, and the open end of the U-shaped structure is rotatably connected to the extension 111. In the unfolded state, the first retaining rod 21 and the second retaining rod 22 unfold relative to each other towards the extension 111.

[0066] The trailer frame also includes a linkage mechanism 31, which comprises connecting rods movably connected to the second support 12 and the second retaining rod 22 respectively. When the second support 12 moves closer to the first support 11, the linkage mechanism 31 drives the second retaining rod 22 to move closer to the first support 11. By setting the linkage mechanism 31, the second support 12 and the second retaining rod 22 are linked, enabling quick folding and unfolding. It is lightweight, convenient, and has a simple structure. After folding, it has a small volume and is easy to carry.

[0067] When folding, the second support 12 can be pushed towards the first support 11, causing the support structure 15 to move the first retaining rod 21 towards the second support 12, and the linkage mechanism 31 to move the second retaining rod 22 towards the first support 11. Alternatively, the first retaining rod 21 or the second retaining rod 22 can be pressed down to push the support structure 15 and the linkage mechanism 31, causing the second support 12 to move towards the first support 11. When unfolding, the second support 12 can be pushed away from the first support 11, causing the support structure 15 to move the first retaining rod 21 away from the second support 12, and the linkage mechanism 31 to move the second retaining rod 22 away from the first support 11. Alternatively, the second retaining rod 22 can be pulled away from the first support 11, causing the linkage mechanism 31 to move the second support 12 away from the first support 11, and the support structure 15 to move the first retaining rod 21 away from the second support 12. Figure 1 and Figure 2 The hollow arrow indicates the folding direction of the trailer.

[0068] The connecting rod is movably connected to the second bracket 12 and the second retaining rod 22 respectively. The movable connection can be a rotational connection or a sliding connection.

[0069] In this embodiment, one end of the connecting rod is rotatably connected to the second bracket 12, and the other end of the connecting rod is rotatably connected to the second surrounding rod 22. Specifically, the second bracket 12 includes a bracket body 121 and a bracket extension rod 122 disposed on the bracket body 121. One end of the connecting rod is rotatably connected to the bracket extension rod 122 about the sixth axis 106, and the other end of the connecting rod is rotatably connected to the second surrounding rod 22 about the seventh axis 107.

[0070] When folding or unfolding, the connecting rod rotates both relative to the second support 12 and relative to the second retaining rod 22, thereby causing the second retaining rod 22 to retract towards the first support 11. Both ends of the connecting rod are rotatable, so that the first support 11, the second support 12, the second retaining rod 22 and the connecting rod form a four-bar linkage, providing stable support.

[0071] Specifically, the second support 12 is rotatably connected to the first support 11 about the first axis 101. One end of the connecting rod is rotatably connected to the second support 12 about the sixth axis 106, and the other end of the connecting rod is rotatably connected to the second retaining rod 22 about the seventh axis 107. The second retaining rod 22 is rotatably connected to the first support 11 about the third axis 103. The first axis 101, the third axis 103, the sixth axis 106, and the seventh axis 107 are the four axes of the four-bar linkage. In the unfolded state, the seventh axis 107 is located on the side of the third axis 103 away from the first retaining rod 21, the first axis 101 is located below the third axis 103, and the sixth axis 106 is located between the first axis 101 and the seventh axis 107.

[0072] In the unfolded state, the first axis 101, the sixth axis 106, and the seventh axis 107 are coplanar. This coplanar arrangement reduces space occupation and also allows the second bracket 12 to provide support for the second retaining rod 22 along the connecting rod in the unfolded state.

[0073] In this embodiment, the support extension rod 122 is disposed inside the support body 121, so that after folding, the second support rod 22 is folded inside the first support 11. This makes full use of space and results in a smaller size after folding.

[0074] The connecting rod can be either a straight rod or a bent rod. Using a straight rod can reduce space occupation and avoid interference with other components.

[0075] See Figure 4 The bracket body 121 includes second support rods 1211 disposed on the left and right sides and second crossbars 1212 disposed at the bottom of the two second support rods 1211. The second support rods 1211 are rotatably connected to the first bracket 11. Specifically, the first bracket 11 is provided with a first lug 113, and the second bracket 12 is provided with a slot. The first lug 113 is inserted into the slot and is rotatably connected by a pivot.

[0076] In other embodiments, one of the second bracket 12 and the second retaining rod 22 is slidably connected to the connecting rod, and the other is rotatably connected to the connecting rod. Alternatively, one end of the connecting rod may be rotatably connected to the bracket extension rod 122, and the other end of the connecting rod may be slidably connected to the second retaining rod 22. Or, one end of the connecting rod may be slidably connected to the bracket extension rod 122, and the other end of the connecting rod may be rotatably connected to the second retaining rod 22. When a slidable connection is provided, the linkage mechanism 31 further includes a first slider rotatably disposed at the end of the connecting rod, the first slider being capable of sliding along a groove on the bracket extension rod 122 or the second retaining rod 22.

[0077] In this embodiment, the first axis 101, the second axis 102, the third axis 103, the fourth axis 104, the fifth axis 105, the sixth axis 106, and the seventh axis 107 are parallel to each other.

[0078] When folded, the first wheel group 13 and the second wheel group 14 move closer together; when unfolded, the first wheel group 13 and the second wheel group 14 move further apart. In this embodiment, the first support 11 is the front support and the second support 12 is the rear support; therefore, the first wheel group 13 is the front wheel group and the second wheel group 14 is the rear wheel group.

[0079] When folded, the first wheel group 13 and the second wheel group 14 overlap at least partially in the left-right direction to reduce space occupation and make the folded volume smaller. Specifically, the first wheel group 13 includes two first rollers spaced apart, and the second wheel group 14 includes two second rollers spaced apart. When folded, the two first rollers are located between the two second rollers.

[0080] In this embodiment, the bottom of the push handle assembly 100 is rotatably connected to the base frame assembly. When folded, the push handle assembly 100 can be retracted towards the first support 11 by rotating it. Specifically, the bottom of the push handle assembly 100 is rotatably connected to the first support 11, and in the unfolded state, the push handle assembly 100 has a working state of extending from bottom to top away from the first support 11.

[0081] The push handle assembly 100 includes a push handle body, which is a telescopic structure. When folded, the push handle body is compressed and retracted towards the first bracket 11 to save space. Specifically, the push handle body includes an upper push rod and a lower push rod, which are slidably connected and slide in the direction of extension of the upper push rod. The bottom of the lower push rod is rotatably connected to the first bracket 11.

[0082] The trailer also includes a locking mechanism 41, which is disposed on the extension 111 and used to lock the frame assembly. When the locking mechanism 41 is unlocked, the first arm 21 can rotate towards the first bracket 11. When the locking mechanism 41 is locked, the trailer frame remains in the unfolded state. After the locking mechanism 41 is unlocked, the trailer frame can be folded. The locking mechanism 41 can be disposed on the extension 111 and located between the first arm 21 and the second arm 22 to simultaneously lock both the first arm 21 and the second arm 22. The locking mechanism 41 can be an existing trailer locking mechanism 41, the structure and principle of which will not be described in detail here.

[0083] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A trailer frame, characterized in that, include: A perimeter assembly having a first perimeter bar; The base frame assembly includes a first bracket, a second bracket disposed on the first bracket, a first wheel set disposed on the first bracket, and a second wheel set disposed on the second bracket. The first bracket has an extension portion extending into the plane of the first guardrail, and the first guardrail is disposed on the extension portion. The base frame assembly also includes a support structure supporting the first guardrail and the second bracket.

2. The trailer frame according to claim 1, characterized in that, The extension extends in the plane of the first railing and is part of the frame assembly.

3. The trailer frame according to claim 2, characterized in that, The trailer frame has an unfolded state and a folded state; In the unfolded state, the second bracket is rotatably connected to the first bracket about the first axis, and the first arm is rotatably connected to the extension about the second axis. The two ends of the support structure are respectively movably connected to the second bracket and the first retaining rod; During the transition from the unfolded state to the folded state, the second bracket rotates toward the first bracket, and the support structure moves toward the second bracket, causing the first enclosure rod to rotate toward the second bracket.

4. The trailer frame according to claim 3, characterized in that, The frame assembly also has a second rail rotatably connected to at least one of the extension and the first rail, which rotates toward the first support when folded.

5. The trailer frame according to claim 4, characterized in that, The second arm rotates around the third axis and engages with the extension. The second arm is disposed inside the extension so that, in the folded state, the second arm is housed within the first bracket.

6. The trailer frame according to claim 5, characterized in that, The trailer frame also includes a linkage mechanism, which includes connecting rods that are movably connected to the second support and the second retaining rod respectively; when the second support moves closer to the first support, the linkage mechanism drives the second retaining rod to move closer to the first support.

7. The trailer frame according to claim 6, characterized in that, One end of the connecting rod is rotatably connected to the second bracket, and the other end of the connecting rod is rotatably connected to the second retaining rod; Alternatively, one of the second bracket and the second retaining rod is slidably connected to the connecting rod, and the other is rotatably connected to the connecting rod.

8. The trailer frame according to claim 3, characterized in that, The second bracket is connected to the first bracket at the lower side of the extension and is positioned opposite to each other near the top of the first bracket; And / or, along the longitudinal direction of the trailer frame, the second axis is located at the midpoint between the first axis and the connection point between the support structure and the first guardrail.

9. The trailer frame according to claim 3, characterized in that, It also includes a locking mechanism disposed on the extension and used to lock the enclosure assembly. When the locking mechanism is in the unlocked state, the first enclosure rod can rotate toward the first support.

10. A trailer, characterized in that, Includes a seating assembly and a trailer frame as described in any one of claims 1-9, wherein the frame assembly is used to support the seating assembly.

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