Stroller frame

Abstract

This invention provides a stroller frame, comprising: a base frame assembly, a push handle assembly, a seat assembly, a backrest assembly, and a locking assembly; the base frame assembly, push handle assembly, and seat assembly are rotatably connected and share the same rotation center; the backrest assembly is mounted on the push handle assembly; the locking assembly controls the relative movement between the base frame assembly, push handle assembly, and seat assembly, enabling the push handle assembly and seat assembly to rotate relative to the base frame assembly in a relatively fixed posture, allowing the push handle assembly and seat assembly to switch positions relative to the base frame assembly between at least two different angles. In this embodiment, during use after the stroller frame is unfolded, the push handle assembly and base frame assembly can be rotated as a whole to adjust the angle. The push handle assembly can be used for the user to push the stroller and also for adjusting the angle of the backrest assembly. Furthermore, the unfolding and folding of the entire stroller frame and the adjustment of the backrest assembly angle are achieved through the same joint, resulting in a simpler and more compact overall structure.

Description

Technical Field

[0001] This invention relates to the field of assistive mobility equipment technology, and in particular to a trolley frame. Background Technology

[0002] Strollers can be used to assist with travel; for example, parents can place their young children in a stroller to facilitate outdoor activities. Some existing strollers have non-adjustable backrests, while others have adjustable backrests but require separate adjustment mechanisms, making the overall structure of the stroller relatively complex. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a trolley frame.

[0004] According to one embodiment of the present invention, a stroller frame includes: a base frame assembly, a push handle assembly, a seat assembly, a backrest assembly, and a locking assembly; the base frame assembly, the push handle assembly, and the seat assembly are rotatably connected and share the same rotation center; the backrest assembly is mounted on the push handle assembly; the locking assembly is capable of controlling the relative movement relationship between the base frame assembly, the push handle assembly, and the seat assembly, so as to enable the push handle assembly and the seat assembly to rotate relative to the base frame assembly in a relatively fixed posture, thereby allowing the push handle assembly and the seat assembly to switch positions relative to the base frame assembly between at least two different angles.

[0005] The stroller frame according to the present invention has at least the following beneficial effects: In the process of use after unfolding, the push handle assembly and the base frame assembly can be rotated and adjusted as a whole to provide more seating angles for young children. The push handle assembly can be used for the user to push the stroller and can also be used to adjust the angle of the backrest assembly. Moreover, the unfolding and folding of the entire stroller frame and the adjustment of the backrest assembly angle are all achieved through the same joint, making the overall structure simpler and more compact.

[0006] According to some embodiments of the present invention, the locking assembly includes: a first locking mechanism for opening and closing relative rotation between the push handle assembly and the seat assembly; and a second locking mechanism for opening and closing relative rotation between the base frame assembly and the push handle assembly, or between the base frame assembly and the seat assembly, or between the base frame assembly and the push handle assembly and the seat assembly.

[0007] According to some embodiments of the present invention, the first locking mechanism includes a slider, the push handle assembly includes a first rotating portion, and the seat assembly includes a second rotating portion. The first rotating portion and the second rotating portion are axially connected along the rotation center. The first rotating portion has a first receiving position for the slider to slide along the rotation center, and the second rotating portion has a second receiving position. The slider has at least a first unlocking position and a first locking position. When the slider is in the first locking position, one end is located in the first receiving position, and the other end is inserted into the second receiving position to restrict the relative rotation of the push handle assembly and the seat assembly. When the slider is in the first unlocking position, it is located in the first receiving position so that the push handle assembly and the seat assembly can rotate relative to each other.

[0008] According to some embodiments of the present invention, the sliding member includes at least one limiting portion, a first groove that mates with the limiting portion is provided on the inner sidewall of the first receiving position, and a second groove that mates with the limiting portion is provided on the inner sidewall of the second receiving position.

[0009] According to some embodiments of the present invention, a plurality of limiting portions are provided and distributed around the rotation center, the number of the first grooves is the same as the number of the limiting portions, and the number of the second grooves is greater than the number of the limiting portions.

[0010] According to some embodiments of the present invention, the second locking mechanism is used to open or close the relative rotation between the base frame assembly, the push handle assembly, and the seat assembly; The second locking mechanism includes a sliding rod that can slide radially along the rotation center. The base frame assembly is provided with a mounting part, which is axially connected to the first rotating part and the second rotating part along the rotation center. The mounting part, the first rotating part, and the second rotating part are all provided with locking holes. Two of the mounting part, the first rotating part, and the second rotating part are provided with arc-shaped sliding holes. The center of the sliding hole is located at the rotation center. The locking hole communicates with the corresponding sliding hole. The sliding rod has at least a second locking position and a second unlocking position. The sliding rod in the second locking position passes through three locking holes simultaneously. The sliding rod in the second unlocking position slides to the sliding hole. The sliding rod can slide relative to different sliding holes.

[0011] According to some embodiments of the present invention, the mounting portion includes two mounting arms disposed opposite to each other, the first rotating portion and the second rotating portion being located between the two mounting arms; the mounting arms are provided with the sliding hole and at least two locking holes, both of the locking holes communicating with the sliding hole; the second rotating portion is located between the mounting arm and the first rotating portion, the second rotating portion being provided with the locking hole and the sliding hole, and the first rotating portion being provided with the locking hole.

[0012] According to some embodiments of the present invention, the second locking mechanism is used to open or close the relative rotation between the base frame assembly and the seat assembly; The second locking mechanism includes a sliding rod that can slide radially along the rotation center. The base frame assembly is provided with a mounting part, which is axially connected to the second rotating part along the rotation center. Both the mounting part and the second rotating part are provided with locking holes. One of the mounting part and the second rotating part is provided with an arc-shaped sliding hole. The center of the sliding hole is located at the rotation center. The locking hole communicates with the corresponding sliding hole. The sliding rod has at least a second locking position and a second unlocking position. When the sliding rod is in the second locking position, it passes through both locking holes. When the sliding rod is in the second unlocking position, it slides to the sliding hole. The sliding rod can slide relative to the sliding hole.

[0013] According to some embodiments of the present invention, the mounting portion includes two mounting arms disposed opposite to each other, the first rotating portion and the second rotating portion being located between the two mounting arms; the mounting arms are provided with the sliding hole and at least two locking holes, both of the locking holes communicating with the sliding hole; the second rotating portion is located between the mounting arm and the first rotating portion, and the second rotating portion is provided with the locking hole.

[0014] According to some embodiments of the present invention, the base frame assembly includes a front leg tube and a rear leg tube, the front leg tube and the rear leg tube are rotatably connected, the front leg tube or the rear leg tube is rotatably connected to the push handle assembly and the seat assembly, and both the front leg tube and the rear leg tube are connected to casters.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of a stroller frame. Figure 1 ; Figure 2 This is a schematic diagram of one embodiment of a stroller frame. Figure 2 ; Figure 3 This is an exploded view of one embodiment of the trolley frame; Figure 4 yes Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 This is a cross-sectional view of one embodiment of the stroller frame. Figure 1 ; Figure 6 This is a cross-sectional view of one embodiment of the stroller frame. Figure 2 .

[0017] Figure Labels Push handle assembly 100; first rotating part 110; first receiving position 120; first groove 130; Seat assembly 200; second rotating part 210; second receiving position 220; second groove 230; Sliding member 310; limiting part 320; Sliding rod 410; Mounting part 510; locking hole 520; sliding hole 530; mounting arm 540; Front leg tube 610; rear leg tube 620; casters 630. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these 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 are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] like Figures 1 to 5As shown, this embodiment provides a stroller frame, including a base frame assembly, a push handle assembly 100, a seat assembly 200, a backrest assembly, and a locking assembly. The base frame assembly, push handle assembly 100, and seat assembly 200 are rotatably connected and share the same rotation center. The base frame assembly is used to install components such as a seat cushion for a child to sit on. The backrest assembly is installed on the push handle assembly 100 and provides a backrest for the child. The push handle assembly 100 serves both to allow the user to push the stroller and to install the backrest assembly. The locking assembly controls the relative movement between the base frame assembly, push handle assembly 100, and seat assembly 200, so that the push handle assembly 100 and seat assembly 200 can rotate relative to the base frame assembly in a relatively fixed posture, allowing the push handle assembly 100 and seat assembly 200 to switch positions relative to the base frame assembly between at least two different angles.

[0023] The specific usage process is as follows: When the backrest assembly needs to be adjusted, the locking component prevents the push handle assembly 100 and the seat assembly 200 from rotating relative to each other, while allowing the push handle assembly 100 and the seat assembly 200 to rotate relative to the base frame assembly. At this time, by rotating the push handle assembly 100 and the seat assembly 200, the angle of the push handle assembly 100 relative to the base frame assembly can be adjusted. After switching to another angle, the locking component locks the relative rotation of the base frame assembly, push handle assembly 100, and seat assembly 200. When folding for storage, the locking component unlocks the relative rotation of the base frame assembly, push handle assembly 100, and seat assembly 200, allowing them to rotate freely to the folded state.

[0024] In this embodiment, during the use of the stroller frame after unfolding, the push handle assembly 100 and the base frame assembly can be rotated as a whole to adjust the angle, providing more seating angles for young children. The push handle assembly 100 can be used for the user to push the stroller and also for adjusting the angle of the backrest assembly. Furthermore, the unfolding and folding of the entire stroller frame and the adjustment of the backrest assembly angle are all achieved through the same joint, making the overall structure simpler and more compact.

[0025] like Figures 3 to 6 As shown, specifically, the locking assembly includes a first locking mechanism and a second locking mechanism. The first locking mechanism is used to open and close the relative rotation between the push handle assembly 100 and the seat assembly 200. The second locking mechanism is used to open and close the relative rotation between the base frame assembly and the push handle assembly 100, or between the base frame assembly and the seat assembly 200, or between the base frame assembly and the push handle assembly 100 and the seat assembly.

[0026] The specific usage process is as follows: When it is necessary to adjust the angle of the chair back assembly, the second locking mechanism is controlled to open the rotation of the base frame assembly relative to the push handle assembly 100, or to open the rotation of the base frame assembly relative to the seat assembly 200, or to open the rotation between the base frame assembly and the push handle assembly 100 and the seat assembly. The first locking mechanism closes the relative rotation between the push handle assembly 100 and the seat assembly 200. At this time, the push handle assembly 100 and the seat assembly 200 can rotate as a whole relative to the base frame assembly to adjust the angle. Figure 1 and Figure 2 This is a schematic diagram of the seat assembly 200 at different angles. When the trolley frame needs to be folded, the second locking mechanism is controlled to open the rotation of the base frame assembly relative to the push handle assembly 100, or to open the rotation of the base frame assembly relative to the seat assembly 200, or to open the rotation between the base frame assembly and the push handle assembly 100 and the seat assembly. The first locking mechanism opens the relative rotation of the push handle assembly 100 and the seat assembly 200, so that the base frame assembly, push handle assembly 100 and seat assembly 200 can rotate freely to the folded state.

[0027] like Figures 3 to 6 As shown, in some exemplary embodiments, the first locking mechanism includes a slider 310, the push handle assembly 100 includes a first rotating part 110, and the seat assembly 200 includes a second rotating part 210. The first rotating part 110 and the second rotating part 210 are axially connected along the rotation center. The first rotating part 110 and the second rotating part 210 can be mounted by a mounting shaft. The first rotating part 110 is provided with a first receiving position 120 for the slider 310 to slide along the rotation center. When the slider 310 is located in the first receiving position 120, the slider 310 can only slide relative to the first rotating part 110 along the rotation center and cannot rotate relative to the first rotating part 110. The second rotating part 210 is provided with a second receiving position 220. When the slider 310 is engaged with the second receiving position 220, the second rotating part 210 cannot rotate relative to the slider 310.

[0028] The slider 310 has at least a first unlocked position and a first locked position. In the first locked position, one end of the slider 310 is located in the first receiving position 120, and the other end is inserted into the second receiving position 220. At this time, the first rotating part 110 cannot rotate relative to the slider 310, and the second rotating part 210 also cannot rotate relative to the slider 310, thus restricting the relative rotation of the push handle assembly 100 and the seat assembly 200. In the first unlocked position, the slider 310 is located within the first receiving position 120. At this time, the second rotating part 210 can rotate relative to the slider 310, and then relative to the first rotating part 110, thereby allowing the push handle assembly 100 and the seat assembly 200 to rotate relative to each other. The slider 310 can be operated by pulling a rope with spring reset, or by pressing a button with spring reset. These existing technologies are sufficient and will not be elaborated upon here.

[0029] like Figures 3 to 6 As shown, specifically, in some embodiments, the slider 310 includes at least one limiting portion 320, which protrudes radially along the rotation center. A first groove 130, cooperating with the limiting portion 320, is provided on the inner wall of the first receiving position 120, and is recessed radially along the rotation center. A second groove 230, cooperating with the limiting portion 320, is provided on the inner wall of the second receiving position 220, and is recessed radially along the rotation center. The rotation of the slider 310 relative to the first rotating part 110 and the second rotating part 210 is limited by the cooperation of the limiting portion 320 with the first groove 130 and the second groove 230, resulting in a simple and practical structure.

[0030] like Figure 3 and Figure 4 As shown, specifically, in some embodiments, multiple limiting portions 320 are provided, and the multiple limiting portions 320 are distributed around the rotation center. The number of first grooves 130 is the same as the number of limiting portions 320. The cooperation of multiple limiting portions 320 with multiple first grooves 130 can increase the stability of the structure. The number of second grooves 230 is greater than the number of limiting portions 320, which allows the sliding member 310 to cooperate with the second grooves 230 at different positions, thereby allowing the first rotating part 110 and the second rotating part 210 to remain stable at different angles.

[0031] like Figures 3 to 6As shown, in some exemplary embodiments, the second locking mechanism is used to open and close the relative rotation between the base frame assembly and the push handle assembly 100 and the seat assembly; the second locking mechanism includes a sliding rod 410 that can slide radially along the rotation center; the base frame assembly is provided with a mounting part 510, which is axially connected to the first rotating part 110 and the second rotating part 210 along the rotation center; the mounting part 510, the first rotating part 110 and the second rotating part 210 are all provided with locking holes 520; the mounting part 510 and the second rotating part 210 are all provided with arc-shaped sliding holes 530, the center of which is located at the rotation center; the locking hole 520 communicates with the corresponding sliding hole 530; the sliding rod 410 has at least a second locking position and a second unlocking position, such as... Figure 5 As shown, the sliding rod 410 in the second locked position simultaneously passes through three locking holes 520. At this time, the mounting part 510 cannot rotate relative to the first rotating part 110 and the second rotating part 210; Figure 6 As shown, the sliding rod 410 in the second unlocked position slides to the sliding hole 530. The sliding rod 410 can slide relative to different sliding holes 530. At this time, since both the mounting part 510 and the second rotating part 210 are provided with sliding holes 530, both the mounting part 510 and the second rotating part 210 can rotate relative to the sliding rod 410, thereby completing the folding and storage of the frame.

[0032] It should be noted that the sliding hole 530 is not limited to being provided on the mounting part 510 and the second rotating part 210. It can also be provided in other embodiments. For example, the sliding hole 530 can be provided on the mounting part 510 and the second rotating part 210, or the sliding hole 530 can be provided on the first rotating part 110 and the second rotating part 210. In both cases, the relative rotation between the base frame assembly and the push handle assembly 100 and the seat assembly can be opened or closed by the sliding rod 410.

[0033] like Figures 3 to 6As shown, specifically, in some embodiments, the mounting portion 510 includes two mounting arms 540 arranged relatively parallel to each other, with a first rotating portion 110 and a second rotating portion 210 located between the two mounting arms 540. Each mounting arm 540 is provided with a sliding hole 530 and two locking holes 520, both of which communicate with the sliding hole 530. The second rotating portion 210 is located between the mounting arm 540 and the first rotating portion 110, and is provided with both the locking hole 520 and the sliding hole 530. The first rotating portion 110 is provided with the locking hole 520. In this embodiment, the two mounting arms 540, the first rotating portion 110, and the second rotating portion 210 can be connected together along the rotation center by a mounting shaft, resulting in a stable and reliable structure. The two locking holes 520 mean that the sliding rod 410 can be positioned in two locations, thus providing two options for the user when selecting the angle of the chair back assembly. The sliding of the sliding rod 410 in the locking hole 520 can be achieved by using a button in conjunction with a spring, or by using a pull cord in conjunction with a spring to reset. These existing technologies can be used to achieve this, and will not be elaborated here.

[0034] It should be noted that the number of locking holes 520 on the mounting arm 540 can be adjusted as needed. For example, the number of locking holes 520 on the mounting arm 540 can be three or more. Each locking hole 520 corresponds to a specific angle of the chair back assembly. The more locking holes 520 there are, the more angles the user can choose.

[0035] For example, in some embodiments, the second locking mechanism is used to open and close the relative rotation between the base frame assembly and the seat assembly; the second locking mechanism includes a sliding rod 410 that can slide radially along the rotation center; the base frame assembly is provided with a mounting portion 510, which is axially connected to the second rotating portion 210 along the rotation center; both the mounting portion 510 and the second rotating portion 210 are provided with locking holes 520; one of the mounting portion 510 and the second rotating portion 210 is provided with an arc-shaped sliding hole 530, the center of which is located at the rotation center; the locking hole 520 communicates with the corresponding sliding hole 530; the sliding rod 410 only covers the mounting portion 510 and the second rotating portion 210, but does not cover the first rotating portion 110; the sliding rod 410 has at least a second In the locked position and the second unlocked position, the sliding rod 410 in the second locked position simultaneously passes through the two locking holes 520. At this time, the mounting part 510 and the second rotating part 210 cannot rotate relative to each other. In the second unlocked position, the sliding rod 410 slides to the sliding hole 530. The sliding rod 410 can slide relative to the sliding hole 530. At this time, since the second rotating part 210 is provided with sliding holes 530, the second rotating part 210 can rotate relative to the sliding rod 410. The first rotating part 110 is not restricted by the second locking mechanism. After the first locking mechanism is opened, the first rotating part 110 can rotate relative to the second rotating part 210 to fold and store, thereby completing the folding and storage of the frame.

[0036] Specifically, in some embodiments, the mounting portion 510 includes two mounting arms 540 disposed opposite to each other, with a first rotating portion 110 and a second rotating portion 210 located between the two mounting arms 540. Each mounting arm 540 is provided with a sliding hole 530 and at least two locking holes 520, both of which communicate with the sliding hole 530. The second rotating portion 210 is located between the mounting arm 540 and the first rotating portion 110, and is also provided with locking holes 520. In this embodiment, the two mounting arms 540, the first rotating portion 110, and the second rotating portion 210 can be connected together along the rotation center axial direction via a mounting shaft, resulting in a stable and reliable structure. The two locking holes 520 mean that the sliding rod 410 can be positioned in two different locations, thus providing two options for the user when selecting the angle of the chair back assembly. The sliding of the sliding rod 410 in the locking hole 520 can be achieved by a button combined with a spring, or by a pull cord combined with a spring return mechanism. These existing technologies are sufficient and will not be elaborated upon here.

[0037] It should be noted that the number of locking holes 520 on the mounting arm 540 can be adjusted as needed. For example, the number of locking holes 520 on the mounting arm 540 can be three or more. Each locking hole 520 corresponds to a specific angle of the chair back assembly. The more locking holes 520 there are, the more angles the user can choose.

[0038] like Figures 1 to 3 As shown, in some exemplary embodiments, the base frame assembly includes a front leg tube 610 and a rear leg tube 620. In order to fold the base frame assembly into a polarity for storage, the front leg tube 610 and the rear leg tube 620 are rotatably connected. The front leg tube 610 is fixedly connected to the mounting arm 540, thereby realizing the rotatable connection between the front leg tube 610 and the push handle assembly 100 and the seat assembly 200. The lower end of the mounting arm 540 is rotatably connected to the rear leg tube 620, thereby realizing the rotatable connection between the front leg tube 610 and the rear leg tube 620. Both the front leg tube 610 and the rear leg tube 620 are connected to casters 630 for walking.

[0039] It should be noted that the base frame assembly does not necessarily have to be rotatably connected to the push handle assembly 100 and the seat assembly via the front leg tube 610. It can also be rotatably connected to the push handle assembly 100 and the seat assembly via the rear leg tube 620. For example, the rear leg tube 620 is fixedly connected to the mounting arm 540, thereby achieving a rotatable connection between the rear leg tube 620 and the push handle assembly 100 and the seat assembly 200. The lower end of the mounting arm 540 is rotatably connected to the front leg tube 610, thereby achieving a rotatable connection between the front leg tube 610 and the rear leg tube 620.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A stroller frame, characterized in that, include: The base frame assembly, the push handle assembly (100), and the seat assembly (200) are rotatably connected and share the same rotation center. A backrest assembly is mounted on the push handle assembly (100). The locking component controls the relative movement between the base frame assembly, the push handle assembly (100), and the seat assembly (200) to enable the push handle assembly (100) and the seat assembly (200) to rotate relative to the base frame assembly in a relatively fixed posture, so that the push handle assembly (100) and the seat assembly (200) can switch positions relative to the base frame assembly between at least two different angles.

2. The trolley frame according to claim 1, characterized in that, The locking component includes: A first locking mechanism is used to open or close the relative rotation between the push handle assembly (100) and the seat assembly (200); The second locking mechanism is used to open or close the relative rotation between the base frame assembly and the push handle assembly (100), or between the base frame assembly and the seat assembly (200), or between the base frame assembly and the push handle assembly (100), or between the seat assembly.

3. The trolley frame according to claim 2, characterized in that, The first locking mechanism includes a slider (310), the push handle assembly (100) includes a first rotating part (110), and the seat assembly (200) includes a second rotating part (210). The first rotating part (110) and the second rotating part (210) are axially connected along the rotation center. The first rotating part (110) has a first receiving position (120) for the slider (310) to slide along the rotation center, and the second rotating part (210) has a second receiving position (220). The slider (310) has at least a first unlock position and a first locking position. In the first locking position, one end of the slider (310) is located in the first receiving position (120), and the other end is inserted into the second receiving position (220) to restrict the relative rotation of the push handle assembly (100) and the seat assembly (200). In the first unlock position, the slider (310) is located in the first receiving position (120) so that the push handle assembly (100) and the seat assembly (200) can rotate relative to each other.

4. The trolley frame according to claim 3, characterized in that, The sliding member (310) includes at least one limiting part (320), the inner wall of the first receiving part (120) is provided with a first groove (130) that cooperates with the limiting part (320), and the inner wall of the second receiving part (220) is provided with a second groove (230) that cooperates with the limiting part (320).

5. The trolley frame according to claim 4, characterized in that, The limiting part (320) is provided in multiple ways and distributed around the rotation center. The number of the first groove (130) is the same as the number of the limiting part (320), and the number of the second groove (230) is greater than the number of the limiting part (320).

6. The trolley frame according to claim 3, characterized in that, The second locking mechanism is used to open and close the relative rotation between the base frame assembly, the push handle assembly (100), and the seat assembly; The second locking mechanism includes a sliding rod (410) that can slide radially along the rotation center. The base frame assembly is provided with a mounting part (510), which is axially connected to the first rotating part (110) and the second rotating part (210) along the rotation center. The mounting part (510), the first rotating part (110), and the second rotating part (210) are all provided with locking holes (520). Two of the mounting part (510), the first rotating part (110), and the second rotating part (210) are provided with... There is an arc-shaped sliding hole (530), the center of which is located at the rotation center. The locking hole (520) is connected to the corresponding sliding hole (530). The sliding rod (410) has at least a second locking position and a second unlocking position. The sliding rod (410) in the second locking position passes through three locking holes (520) at the same time. The sliding rod (410) in the second unlocking position slides to the sliding hole (530). The sliding rod (410) can slide relative to different sliding holes (530).

7. The trolley frame according to claim 6, characterized in that, The mounting part (510) includes two mounting arms (540) arranged opposite to each other. The first rotating part (110) and the second rotating part (210) are located between the two mounting arms (540). The mounting arm (540) is provided with the sliding hole (530) and at least two locking holes (520). Both locking holes (520) are connected to the sliding hole (530). The second rotating part (210) is located between the mounting arm (540) and the first rotating part (110). The second rotating part (210) is provided with the locking hole (520) and the sliding hole (530). The first rotating part (110) is provided with the locking hole (520).

8. The trolley frame according to claim 3, characterized in that, The second locking mechanism is used to open or close the relative rotation between the base frame assembly and the seat assembly; The second locking mechanism includes a sliding rod (410) that can slide radially along the rotation center. The base frame assembly is provided with a mounting part (510). The mounting part (510) and the second rotating part (210) are axially connected along the rotation center. Both the mounting part (510) and the second rotating part (210) are provided with locking holes (520). One of the mounting part (510) and the second rotating part (210) is provided with an arc-shaped sliding hole (530). The center of the sliding hole (530) is located at the rotation center. The locking hole (520) communicates with the corresponding sliding hole (530). The sliding rod (410) has at least a second locking position and a second unlocking position. The sliding rod (410) in the second locking position passes through both locking holes (520) at the same time. The sliding rod (410) in the second unlocking position slides to the sliding hole (530). The sliding rod (410) can slide relative to the sliding hole (530).

9. The trolley frame according to claim 8, characterized in that, The mounting part (510) includes two mounting arms (540) arranged opposite to each other. The first rotating part (110) and the second rotating part (210) are located between the two mounting arms (540). The mounting arm (540) is provided with the sliding hole (530) and at least two locking holes (520). Both locking holes (520) are connected to the sliding hole (530). The second rotating part (210) is located between the mounting arm (540) and the first rotating part (110). The second rotating part (210) is provided with the locking hole (520).

10. The trolley frame according to claim 1, characterized in that, The base frame assembly includes a front leg tube (610) and a rear leg tube (620), which are rotatably connected. The front leg tube (610) or the rear leg tube (620) is rotatably connected to the push handle assembly (100) and the seat assembly (200). Both the front leg tube (610) and the rear leg tube (620) are connected to casters (630).

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