Stroller chassis, stroller frame, and stroller

Abstract

The application discloses a stroller bottom frame, a stroller frame and a child stroller, and relates to the technical field of children's products. The stroller bottom frame comprises a bottom support and a wheel assembly. The wheel assembly comprises a connecting support rod and a caster wheel. The support rod is movably connected with at least one of the bottom support and the caster wheel, so that the caster wheel is reversibly arranged relative to the bottom support and has an unfolded position and a storage position. When the caster wheel is in the storage position, it is stored inside or below the bottom support. The technical scheme of the application provides a stroller bottom frame with a foldable caster wheel.

Description

Technical Field

[0001] This invention relates to the field of technology, and in particular to a stroller base, stroller frame, and children's stroller. Background Technology

[0002] Existing strollers include stroller frames with unfolded and folded states, but the casters of current stroller frames cannot be folded, resulting in a large size of stroller frames after folding, which requires a lot of space. Summary of the Invention

[0003] The main objective of this invention is to provide a stroller base, stroller frame, and children's stroller, with the aim of providing a stroller base with foldable casters.

[0004] To achieve the above objectives, the trolley frame proposed in this invention includes:

[0005] Bottom support; and

[0006] A wheel assembly comprising a connected support rod and a caster, the support rod being movably connected to at least one of the bottom support and the caster, such that the caster is rotatably disposed at least relative to the bottom support and has an extended position and a retracted position;

[0007] When the caster is in the receiving position, it is received inside or below the bottom bracket.

[0008] In one embodiment, the support rod is rotatably connected to the bottom bracket, the rotation axis of the support rod is parallel to the length direction of the support rod, and the support rod rotates relative to the bottom bracket to drive the caster to flip relative to the bottom bracket;

[0009] And / or, the support rod is slidably connected to the bottom bracket, and the sliding direction of the support rod relative to the bottom bracket is the same as the length direction of the support rod;

[0010] And / or, the bottom bracket is provided with a plug hole, and at least a portion of the support rod is inserted into the plug hole.

[0011] In one embodiment, the wheel assembly further includes a caster bracket connected to the support rod;

[0012] When the trolley base is in the unfolded state, the caster bracket extends downward from the support rod, and the caster is located at the lower end of the caster bracket.

[0013] In one embodiment, the caster bracket is rotatably connected to the support rod, so that the caster bracket and the caster can be flipped relative to the support rod and the bottom bracket.

[0014] In one embodiment, the bottom support is a seat or plate-like structure, and a receiving space for accommodating the caster is formed inside the bottom support. At least one of the bottom surface and the side surface of the bottom support has an opening in the receiving space.

[0015] Alternatively, the bottom support can be a frame structure, and the casters can be housed inside the frame structure or below the frame structure.

[0016] This application also proposes a trolley frame, including a push rod frame and a trolley base frame as described in any of the foregoing embodiments, wherein the lower part of the push rod frame is rotatably connected to the trolley base frame, and the push rod frame is rotatably foldable into the trolley base frame.

[0017] In one embodiment, the trolley frame further includes a seat frame, one end of which is rotatably connected to the trolley base frame or the push rod frame;

[0018] When the trolley frame is in the unfolded state, the seat frame is located between the trolley base frame and the push rod frame along the rotation direction of the push rod frame;

[0019] When the trolley frame is in the folded state, the seat frame is folded into the trolley base frame and the push rod frame.

[0020] In one embodiment, the seat frame is rotatably connected to the lower part of the push rod frame or to one end of the trolley base frame near the lower part of the push rod frame. The trolley frame further includes a first connecting rod, one end of which is hinged to the trolley base frame, and the other end of which is hinged to a sliding member on the seat frame. The sliding member can slide closer to or away from the pivot axis of the seat frame.

[0021] And / or, the trolley frame includes a second link, one end of which is hinged to the push rod frame, and the other end of which is hinged to a sliding member provided on the seat frame, the sliding member being slidable toward or away from the pivot axis of the seat frame.

[0022] In one embodiment, the trolley frame includes a first link and a second link, the first link and the second link being hinged to the same sliding member;

[0023] And / or, the seat frame includes two side rods arranged side by side along the width direction and a crossbar connecting the two side rods, one end of the side rod is rotatably connected to the lower part of the push rod frame or the end of the trolley base frame near the lower part of the push rod frame, and the sliding member is slidably connected to the side rod;

[0024] And / or, the sliding element is fitted onto the seat frame.

[0025] In one embodiment, the push rod holder is telescopically oriented.

[0026] This application also proposes a child stroller, including a seat assembly and a stroller frame as described in any of the foregoing embodiments, wherein the seat assembly is disposed on the stroller frame.

[0027] The technical solution of this invention, in the trolley frame's base frame, sets the wheel assembly as a combination structure of a support rod and casters, with the casters connected to the bottom support via the support rod. The support rod and bottom support can be movably connected, for example, by allowing the support rod to rotate with its central axis as the pivot, by allowing the support rod to rotate around one end, or by allowing the support rod to be folded, etc., so that the casters can be flipped relative to the bottom support. Alternatively, structures such as extendable and slidable support rods can be combined. Furthermore, the casters can be rotatable relative to the support, allowing them to be flipped relative to the bottom support and support rod. This allows the casters to have an unfolded position and a retracted position relative to the bottom support. When the casters are in the unfolded position, the bottom support can slide using the casters. When the casters are in the retracted position, the casters are flipped at a certain angle relative to the bottom support and retracted into the bottom support, for example, retracted inside or below the bottom support, thus achieving the purpose of foldable casters. Furthermore, by allowing the casters to flip relative to the bottom support, the size of the casters in the height direction of the trolley frame is reduced, further reducing the volume of the trolley base frame after the casters are folded. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a structural diagram of an embodiment of the cart frame of this application in its unfolded state;

[0030] Figure 2 for Figure 1 Structural diagram of the trolley frame in its folded state;

[0031] Figure 3 for Figure 1 Side view of the trolley frame;

[0032] Figure 4 for Figure 3 Structural diagram of the trolley frame in the retracted state of the push rod frame;

[0033] Figure 5 for Figure 4 Another state diagram of the trolley frame;

[0034] Figure 6 for Figure 5 The diagram shows the push rod frame and seat frame of the trolley frame folded into the trolley base frame.

[0035] Figure 7 for Figure 6 A bottom view of the trolley frame;

[0036] Figure 8 for Figure 6 A structural diagram showing the tilting mechanism of one of the casters on the trolley frame.

[0037] Figure 9 for Figure 8 A structural diagram of the trolley frame with one of its casters in the storage position;

[0038] Figure 10 for Figure 1 A structural diagram showing the casters of the trolley frame in their storage position.

[0039] Explanation of icon numbers:

[0040] 100. Trolley frame; 1. Trolley base; 11. Bottom support; 111. Storage space; 12. Wheel assembly; 121. Support rod; 122. Casters; 123. Caster bracket;

[0041] 2. Push rod frame; 3. Seat frame; 31. Sliding component; 32. Side rod; 33. Crossbar; 4. First connecting rod; 5. Second connecting rod.

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0046] Existing strollers include stroller frames with unfolded and folded states, but the casters of current stroller frames cannot be folded, resulting in a large size of stroller frames after folding, which requires a lot of space.

[0047] To solve this problem, the present invention proposes a trolley base frame 1.

[0048] Please see Figure 1 and Figure 2 In one embodiment of this application, the trolley base frame 1 includes a bottom support 11 and a wheel assembly 12. The wheel assembly 12 includes a support rod 121 and a caster 122 connected to each other. The support rod 121 is movably connected to at least one of the bottom support 11 and the caster 122, so that the caster 122 is rotatably disposed at least relative to the bottom support 11 and has an unfolded position and a retracted position. When the caster 122 is in the retracted position, it is retracted inside or below the bottom support 11.

[0049] In this embodiment, the bottom bracket 11 serves as the mounting base for the trolley frame 1. The wheel assembly 12 is mounted on the bottom bracket 11, thereby maintaining the integrity and stability of the overall structure and facilitating its combination with structures such as the push rod frame 2 to form the trolley frame 100. The bottom bracket 11 can be a plate-like structure or a frame structure formed by splicing multiple connecting rods.

[0050] The trolley frame 1 is usually provided with multiple sets of wheel assemblies 12, including front wheels and rear wheels. In order to improve the stability of the trolley frame 1 when supported by the wheel assemblies 12, the wheel assemblies 12 can be provided with at least three sets, for example, including at least two sets of front wheels and at least one set of rear wheels, or including at least one set of front wheels and at least two sets of rear wheels.

[0051] The wheel assembly 12 includes a support rod 121 and a caster 122. The support rod 121 is connected to the bottom bracket 11 and extends along the plane of the bottom bracket 11. The caster 122 is provided on the support rod 121 and is connected to the bottom bracket 11 through the support rod 121. In the normal state where the trolley base 1 is supported by the caster 122 and the trolley base 1 can be moved by the caster 122, the surface of the wheel hub of the caster 122 is parallel to the height direction of the trolley base 1. In this embodiment, the support rod 121 can be rotatably connected to the bottom bracket 11, the caster 122 can be rotatably connected to the support rod 121, or the support rod 121 can be rotatably connected to the bottom bracket 11 and the caster 122 can be rotatably connected to the support rod 121, so that the caster 122 can be flipped relative to the bottom bracket 11, thereby changing the angle between the surface where the caster 122 hub is located and the height direction of the trolley base 1. This allows the caster 122 to be flipped when it is not necessary to use the caster 122 for support or to make the caster 122 roll, thereby reducing the size of the caster 122 in the height direction of the trolley base 1, thereby reducing the height of the trolley base 1, and preventing the caster 122 from rolling on the support surface on which the trolley base 1 is placed, making the trolley base 1 more stable on the support surface.

[0052] In one embodiment, the support rod 121 is rotatably connected to the bottom bracket 11, and its rotation axis is in the same direction as the axis of the support rod 121. This allows the support rod 121 to drive the caster 122 to rotate relative to the bottom bracket 11, causing the caster 122 to flip. This causes the surface of the caster 122 hub to deflect. After deflection, the hub surface of the caster 122 can be tilted relative to the height direction of the trolley base 1, or it can be perpendicular to the height direction of the trolley base 1. This effectively reduces the size of the caster 122 in the height direction of the trolley base 1, reduces the height of the trolley base 1, and improves the flexibility, feasibility, and stability of the trolley base 1 and the trolley frame 100 in small spaces.

[0053] In another embodiment, the caster 122 is rotatably connected to the support rod 121, allowing the caster 122 to flip relative to the support rod 121 and the bottom bracket 11. Similarly, the caster 122 can be deflected so that the hub surface of the caster 122 is tilted or perpendicular to the height direction of the trolley base 1, reducing the size of the caster 122 in the height direction of the trolley base 1, reducing the height of the trolley base 1, and improving the flexibility, feasibility, and stability of the trolley base 1 and the trolley frame 100 in small spaces.

[0054] In this embodiment, the caster 122 has a receiving position and an unfolded position relative to the bottom bracket 11. When the caster 122 is in the unfolded position, the rolling surface of the caster 122 is in contact with the ground or other supporting surface on which the trolley base 1 is placed, and the caster 122 can roll on the supporting surface to drive the trolley base 1 to move. When the trolley base 1 is combined with the push rod frame 2 to form the trolley frame 100, the rolling of the caster 122 when the user pushes the trolley frame 100 to move reduces friction and saves pushing force.

[0055] When the caster 122 is in the retracted position, it can be retracted into the bottom support 11. When the caster 122 is in the unfolded position, it is located to the side of the bottom support 11, so that when the caster 122 is flipped relative to the bottom support 11, it is directly retracted under the bottom support 11. In some embodiments, when the caster 122 is in the unfolded position, the caster 122 is far from the bottom support 11 due to the support rod 121. In this case, the support rod 121 can be movably configured relative to the bottom support 11, for example, by being telescopic, rotatable, or foldable. When it is necessary for the caster 122 to be retracted into the bottom support 11 in the retracted position, the caster 122 is flipped relative to the bottom support 11, and the support rod 121 is retracted, folded, or rotated towards the bottom support 11 to retract the caster 122 into the bottom support 11. Alternatively, the casters 122 can be retracted under the bottom support 11, or a receiving space 111 can be provided within the bottom support 11. An opening communicating with the receiving space 111 can be made on the bottom or side of the bottom support 11, allowing the casters 122 to be retracted from the opening into the receiving space 111. By flipping the casters 122 and storing them in the bottom support 11, the bottom support 11 can occupy less space when folded. In addition, the trolley base 1 can be made more stable when placed on the platform, avoiding the risk of automatic translation due to the rolling of the wheel assembly 12.

[0056] In the technical solution of this application, the wheel assembly 12 in the trolley frame 100 is configured as a combination structure of support rod 121 and caster 122, and the caster 122 is connected to the bottom support 11 through support rod 121. The support rod 121 and the bottom support 11 can be movably connected, for example, the support rod 121 can rotate with its central axis as the pivot, the support rod 121 can rotate with one end of the support rod 121, or the support rod 121 can be folded, etc., so that the caster 122 can be flipped relative to the bottom support 11. It can also be combined with structures that make the support rod 121 telescopic and sliding. In addition, the caster 122 can be rotated relative to the support so that the caster 122 can be flipped relative to the bottom support 11 and the support rod 121. Thus, the caster 122 has an unfolded position and a stored position relative to the bottom support 11. When the caster 122 is in the unfolded position, the bottom support 11 can slide by relying on the caster 122. When the caster 122 is in the retracted position, the caster 122 is rotated at a certain angle relative to the bottom support 11 and is retracted into the bottom support 11, for example, retracted into the inside of the bottom support 11 or below the bottom support 11, thereby achieving the purpose of making the caster 122 foldable. Furthermore, by rotating the caster 122 relative to the bottom support 11, the size of the caster 122 in the height direction of the trolley support is reduced, further reducing the volume of the trolley base 1 after the caster 122 is folded.

[0057] In some embodiments, the support rods 121 extend along the arrangement direction of the front and rear wheels in the trolley base frame 1, allowing the support rods 121 used to connect the front and rear wheels to be staggered. For example, the support rods 121 connecting the front wheels and the support rods 121 connecting the rear wheels can be staggered along the width direction of the trolley base frame 1, or they can be staggered along the height direction or other directions of the trolley base frame 1. This arrangement allows for a longer space to accommodate each support rod 121, increasing the length of the support rods 121 to facilitate a better connection between the support rods 121 and the bottom support 11. In addition, in some embodiments, at least one rod 121 can slide relative to the bottom support 11 in the front-rear direction, thereby moving the casters 122 closer to or further away from the bottom support 11 in the front-rear direction. This staggered arrangement of the two support rods 11 connecting the front and rear wheels avoids interference between the support rods 121 and other support rods 121 during the sliding process. It also allows the support rods 121 to be fully retracted into the bottom support 1, resulting in a smaller and flatter folded trolley base frame 1.

[0058] In one embodiment, the support rod 121 is rotatably connected to the bottom bracket 11, and the rotation axis of the support rod 121 is parallel to the length direction of the support rod 121. The support rod 121 rotates relative to the bottom bracket 11 to drive the caster 122 to flip relative to the bottom bracket 11.

[0059] In this embodiment, the support rod 121 is rotatably connected to the bottom bracket 11, allowing the wheel assembly 12 to rotate relative to the bottom bracket 11. This enables the caster 122 to flip by rotating the support rod 121. The support rod 121 extends approximately along the plane of the bottom bracket 11, and the caster 122 is connected to one end of the support rod 121. A rotating hole can be provided on the bottom bracket 11 for inserting the support rod 121, or a rotating shaft can be provided on the bottom bracket 11, allowing the support rod 121 to be fitted onto the rotating shaft. Both methods allow the caster 122 to flip relative to the bottom bracket 11, and the connection structure between the support rod 121 and the bottom bracket 11 is relatively simple. Furthermore, by rotatably connecting the support rod 121 to the bottom bracket 11, the caster 122 can remain relatively fixed to the support rod 121, eliminating the need for a rotating structure to connect the caster 122 and the support rod 121, thus avoiding an overly complex structure for the wheel assembly 12.

[0060] In one embodiment, the support rod 121 is slidably connected to the bottom bracket 11, and the sliding direction of the support rod 121 relative to the bottom bracket 11 is the same as the length direction of the support rod 121.

[0061] In this embodiment, the support rod 121 is slidably connected to the bottom bracket 11, allowing the support rod 121 to slide and extend relative to the bottom bracket 11. A groove can be provided on the side of the support rod 121, with one side of the bottom bracket 11 positioned within the groove; alternatively, as in the following embodiment, a insertion hole can be provided in the bottom bracket 11 for inserting the support rod 121. By slidably connecting the support rod 121 to the bottom bracket 11, the support rod 121 can retract the casters 122 to the bottom bracket 11 as close as possible, thereby reducing the size and floor space of the folded trolley base 1. Furthermore, the support rod 121 can extend relative to the bottom bracket 11, allowing the casters 122 to move away from the bottom bracket 11, increasing the distance between at least two casters 122 when the trolley base 1 is unfolded. This increases the support area of ​​the trolley base 1 on the ground or other supporting surfaces, improving the stability of the trolley base 1 when placed on the supporting surface when unfolded.

[0062] Please refer to Figures 7 to 9 In one embodiment, the bottom support 11 is provided with a plug hole, and at least a portion of the support rod 121 is inserted into the plug hole.

[0063] In this embodiment, the bottom bracket 11 is provided with a insertion hole extending along the length direction of the support rod 121. Inserting the support rod 121 into the insertion hole increases the contact area between the support rod 121 and the bottom bracket 11, thereby improving the connection strength between the support rod 121 and the bottom bracket 11. Furthermore, in some embodiments, the support rod 121 is movably connected to the bottom bracket 11, for example, by at least one of rotational and sliding connections. This allows the support rod 121 to be inserted into the insertion hole and rotatably connected to the bottom bracket 11, improving the stability of the support rod 121 during rotation relative to the bottom bracket 11. Conversely, allowing the support rod 121 to be slidably inserted into the insertion hole limits its sliding movement, preventing misalignment. Moreover, when the support rod 121 retracts and the caster 122 assembly 12 moves to the receiving position, the support rod 121 is received in the insertion hole, protecting it from bending or breakage due to impact from external objects.

[0064] Please refer to Figure 3 In one embodiment, the wheel assembly 12 further includes a caster bracket 123, which is connected to the support rod 121. When the trolley base 1 is in the unfolded state, the caster bracket 123 extends downward from the support rod 121, and the caster 122 is located at the lower end of the caster bracket 123.

[0065] In this embodiment, the caster 122 is connected to the support rod 121 via a caster bracket 123. The caster 122 is rotatably mounted on the caster bracket 123 so that it can roll on the support surface when unfolded. The caster bracket 123 facilitates the connection between the caster 122 and the support rod 121. In some embodiments, if it is necessary for the caster 122 to be flipped relative to the support rod 121, this can also be achieved by rotating the caster bracket 123 to the support rod 121, thus improving the flexibility and convenience of the structural design.

[0066] Combined with reference Figure 7 and Figure 8 In one embodiment, the caster bracket 123 is rotatably connected to the support rod 121 so that the caster bracket 123 and the caster 122 can be flipped relative to the support rod 121 and the bottom bracket 11.

[0067] In this embodiment, the caster bracket 123 is rotatably connected to the support rod 121 to drive the caster 122 to flip relative to the support rod 121 and the bottom support 11. The caster bracket 123 can be sleeved on the support rod 121. At this time, the cooperation position between the support rod 121 and the caster bracket 123 is a cylindrical structure, so that the caster bracket 123 can rotate around the support rod 121 to make the caster 122 flip relative to the support rod 121 and the bottom support 11.

[0068] Please refer to Figure 1 In one embodiment, the bottom support 11 is a base or a plate-like structure.

[0069] In this embodiment, the bottom support 11 is generally a seat structure or a plate structure. The seat is formed by multiple sides and can be a solid structure or a hollow structure. Both the seat structure and the plate structure have appropriate thickness, which can improve the structural strength of the bottom support 11 to ensure its load-bearing capacity.

[0070] Combined with reference Figures 7 to 10 In one embodiment, a receiving space 111 for accommodating the caster 122 is formed in the bottom bracket 11; wherein, at least one of the bottom surface and the side surface of the bottom bracket 11 has an opening of the receiving space 111.

[0071] In this embodiment, a receiving space 111 is formed inside the bottom support 11. The opening of the receiving space 111 can be located on the bottom surface of the bottom support 11 or on the side surface of the bottom support 11. Specifically, when the caster 122 is located on the side of the bottom support 11, the caster 122 can be flipped relative to the bottom support 11 to flip from the opening on the bottom surface of the bottom support 11 into the receiving space 111. In some embodiments, when the support rod 121 can extend, retract, or rotate relative to the bottom support 11, the caster 122 can enter and exit the receiving space 111 from the opening on the side surface of the bottom support 11 by retracting the support rod 121 or rotating the support rod 121. By setting the receiving space 111, when the trolley base frame 1 is in a folded state, the caster 122 is housed inside the bottom support 11, which can further reduce the height and volume of the trolley base frame 1, thereby reducing the space occupied by the trolley base frame 1 and the trolley frame 100 after folding.

[0072] Please refer to Figures 7 to 10 In some embodiments, the bottom support 11 is generally rectangular. The support rod 121 is located on the plane of the bottom support 11 and can extend along the length of either side of the bottom support 11. The support rod 121 is telescopic relative to the bottom support 11. In this case, an opening is provided on the side of the bottom support 11, allowing the caster 122 to enter and exit the receiving space 111 through the telescopic support rod 121. Additionally, the trolley frame 1 typically includes multiple wheel assemblies 12, including front and rear wheels. A larger receiving space 111 can be provided in the trolley frame 1 to simultaneously accommodate both the front and rear wheels, or at least two receiving spaces 111 can be provided to accommodate the front and rear wheels respectively.

[0073] In one embodiment, the bottom support 11 is a frame structure, and the casters 122 can be accommodated inside the frame structure or below the frame structure.

[0074] In this embodiment, the bottom support 11 is configured as a frame structure formed by multiple connecting rods, and the inner side of the frame structure can form a clearance space to accommodate the casters 122, thereby helping to reduce the size and space occupied by the folded trolley base frame 1.

[0075] Please refer to Figure 1 and Figure 3 This application also proposes a trolley frame 100, including a push rod frame 2 and a trolley base frame 1 as in any of the foregoing embodiments, wherein the lower part of the push rod frame 2 is connected to the trolley base frame 1.

[0076] In this embodiment, the structure of the trolley base frame 1 is the same as that in the previous embodiment. The push rod frame 2 can be a rod-shaped structure, a frame structure, or a plate-shaped structure, etc. When the trolley frame 100 is in the unfolded state, the push rod frame 2 extends upward from the trolley base frame 1 along the height direction of the trolley frame 100. At this time, the user can drive the trolley frame 100 to move by pushing the push rod frame 2. To reduce the space occupied by the trolley frame 100 when not in use, the trolley frame 100 is typically designed as a foldable structure. On one hand, the wheel assembly 12 of the trolley base frame 1 can be folded relative to the bottom support 11 to be housed inside or below the bottom support 11. On the other hand, the push rod frame 2 can be folded, for example, by rotating the push rod frame 2 to the trolley base frame 1 so that the push rod frame 2 can be folded onto the trolley base frame 1. Alternatively, the push rod frame 2 can be detachably connected to the trolley base frame 1 so that the push rod frame 2 can be removed and housed on the trolley base frame 1. Furthermore, the push rod frame 2 can be folded, extended, etc., to reduce the volume of the push rod frame 2 when the trolley frame 100 is not in use, thereby reducing the volume and space occupied by the trolley frame 100.

[0077] The wheel assembly 12 in the trolley base frame 1 is configured as a combination of a support rod 121 and a caster 122. The caster 122 is connected to the bottom support 11 via the support rod 121. The support rod 121 and the bottom support 11 can be movably connected, for example, by rotating the support rod 121 with its central axis as the pivot, rotating the support rod 121 with one end of the support rod 121 as the pivot, or folding the support rod 121, so that the caster 122 can be flipped relative to the bottom support 11. It can also be combined with structures that allow the support rod 121 to be telescopic and sliding. In addition, the caster 122 can be rotated relative to the support so that the caster 122 can be flipped relative to the bottom support 11 and the support rod 121. Thus, the caster 122 has an unfolded position and a stored position relative to the bottom support 11. When the caster 122 is in the unfolded position, the bottom support 11 can slide using the caster 122. When the caster 122 is in the retracted position, the caster 122 is rotated at a certain angle relative to the bottom support 11 and retracted into the bottom support 11, for example, retracted inside or below the bottom support 11, thereby achieving the purpose of making the caster 122 foldable. Furthermore, by rotating the caster 122 relative to the bottom support 11, the size of the caster 122 in the height direction of the trolley support is reduced, further reducing the volume of the trolley base 1 after the caster 122 is folded. In addition, this makes the trolley base 1 more stable when placed on the platform, avoiding the risk of automatic translation due to the rolling of the wheel assembly 12.

[0078] The stroller frame 100 proposed in this application embodiment can be applied to children's strollers, and a seat assembly is fixed on the stroller frame 100; the stroller frame 100 can also be used in handcarts for transporting items. No limitation is made here. Furthermore, since this stroller frame 100 adopts the technical solutions of all the embodiments of the stroller base 1 described above, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0079] Please refer to Figures 3 to 6 In one embodiment, the push rod frame 2 is rotatably connected to the trolley base frame 1 and can be rotatably folded onto the trolley base frame 1.

[0080] In this embodiment, the push rod frame 2 is rotatably connected to the trolley base frame 1, so that the push rod frame 2 can be rotatably folded onto the bottom support 11 of the trolley base frame 1. With this configuration, the volume and space occupied by the trolley frame 100 can be reduced when it is not needed; when the push rod frame 2 is needed, it can be unfolded by rotating the push rod frame 2 without disassembling or assembling the push rod frame 2, making the operation relatively simple.

[0081] Please refer to Figure 1In one embodiment, the trolley frame 100 further includes a seat frame 3, one end of which is rotatably connected to the trolley base frame 1 or the push rod frame 2. When the trolley frame 100 is in the unfolded state, the seat frame 3 is located between the trolley base frame 1 and the push rod frame 2 along the rotation direction of the push rod frame 2. When the trolley frame 100 is in the folded state, the seat frame 3 is folded between the trolley base frame 1 and the push rod frame 2.

[0082] In this embodiment, the stroller frame 100 can be used in a child stroller, and a seat frame 3 is provided in the stroller frame 100. When the stroller frame 100 is in the unfolded state, the seat frame 3 is located between the stroller base frame 1 and the push rod frame 2 in the rotation direction of the push rod frame 2, so as to fix the seat assembly and improve the load-bearing capacity of the seat assembly. In addition, the seat frame 3 can be rotatably connected to the stroller base frame 1 or to the push rod frame 2; for example, when the seat frame 3 is rotatably connected to the stroller base frame 1, one end of the seat frame 3 can be rotatably connected to the end of the stroller base frame 1 near the push rod frame 2, or the seat frame 3 can be rotatably connected to the end of the stroller base frame 1 away from the push rod frame 2; wherein, a support structure can be provided to support the seat frame 3 when the stroller frame 100 is unfolded; in addition, when the seat frame 3 is rotatably connected to the end of the stroller base frame 1 away from the push rod frame 2 and the stroller frame 100 is unfolded, one end of the seat frame 3 can be resting on the push rod frame 2. Similarly, when the seat frame 3 and the push rod frame 2 are rotatably connected, the seat frame 3 can be rotatably connected to the lower part of the push rod frame 2, or the seat frame 3 can be rotatably connected to the push rod frame 2 at any position; there is no limitation here. By making the seat frame 3 rotatable, the seat frame 3 can be folded together with the trolley base frame 1 and the push rod frame 2, so that the trolley frame 100 is in a folded state. This reduces the volume of the push rod frame 2 when the trolley frame 100 is not in use, thereby reducing the volume and space occupied by the trolley frame 100.

[0083] Please refer to Figures 3 to 5 In one embodiment, the seat frame 3 is rotatably connected to the lower part of the push rod frame 2 or the end of the trolley base frame 1 near the lower part of the push rod frame 2. The trolley frame 100 also includes a first connecting rod 4, one end of which is hinged to the trolley base frame 1, and the other end of which is hinged to a sliding member 31 on the seat frame 3. The sliding member 31 can slide close to or away from the pivot axis of the seat frame 3.

[0084] In this embodiment, the rotatable connection position between the seat frame 3 and the push rod frame 2 or the trolley base frame 1 is adjacent to the rotatable connection position between the push rod frame 2 and the trolley base frame 1. Alternatively, the push rod frame 2, seat frame 3, and trolley base frame 1 can be rotatably connected to the same position. Furthermore, a first connecting rod 4 is provided in the trolley frame 100, with both ends connected to the trolley base frame 1 and the seat frame 3 respectively. This allows the trolley frame 100 to support the seat frame 3 when unfolded, improving the positional stability and load-bearing capacity of the seat frame 3. Simultaneously, the first link 4 is hinged to the trolley base frame 1, and the other end of the first link 4 away from the trolley base frame 1 is hinged to the sliding member 31 set on the seat frame 3. The sliding member 31 can slide closer to or away from the pivot axis of the seat frame 3. With this configuration, when the seat frame 3 is rotated and folded, as the seat frame 3 rotates, the sliding member 31 will drive one end of the first link 4 to slide on the seat frame 3 away from the pivot axis of the seat frame 3. At the same time, the other end of the first link 4 rotates relative to the trolley base frame 1, so that the first link 4 can be folded at the same time as the seat frame 3 is folded, without the need to remove the first link 4. When the seat frame 3 is unfolded, as the seat frame 3 rotates, the sliding member 31 will drive one end of the first link 4 to slide on the seat frame 3 towards the pivot axis of the seat frame 3, which can automatically drive the first link 4 to unfold to support the seat frame 3, improve the positional stability and load-bearing capacity of the seat frame 3, simplify operation, and improve ease of use.

[0085] The sliding member 31 can be slidably disposed on the surface of the seat frame 3, for example, a groove is provided on the seat frame 3 so that the sliding member 31 can be slidably disposed in the groove; or the sliding member 31 can be slidably connected to the seat frame 3 by a guide rail; or the sliding member 31 can be sleeved on the entire seat frame 3, or sleeved on a guide rod provided on the seat frame 3.

[0086] In addition, in this embodiment, only one first link 4 can be provided to connect the trolley base frame 1 and the seat frame 3, or at least two first links 4 can be provided, arranged along the width direction of the trolley frame 100. For example, two first links 4 can be provided on both sides of the trolley frame 100, and the two ends of each first link 4 can be hinged to the trolley base frame 1 and the sliding member 31, respectively. This arrangement can further improve the positional stability and load-bearing capacity of the seat frame 3 when the trolley frame 100 is unfolded. When at least two first links 4 are provided, at least two sliding members 31 can be provided on the seat frame 3 at intervals along the width direction, so that each first link 4 is hinged to the sliding member 31 located at the same width position. Alternatively, the sliding member 31 can extend along the width direction of the trolley frame 100, so that at least two first links 4 arranged side by side along the width direction are connected to the same sliding member 31. No limitation is made here.

[0087] Please refer to Figures 3 to 5In some embodiments, the stroller frame 100 includes a second link 5, one end of which is hinged to the push rod frame 2, and the other end of which is hinged to a sliding member 31 provided on the seat frame 3. The sliding member 31 can slide closer to or further away from the pivot axis of the seat frame 3.

[0088] In this embodiment, the rotatable connection position between the seat frame 3 and the push rod frame 2 or the trolley base frame 1 is adjacent to the rotatable connection position between the push rod frame 2 and the trolley base frame 1. Alternatively, the push rod frame 2, seat frame 3, and trolley base frame 1 can be rotatably connected to the same position. Furthermore, a second connecting rod 5 is provided in the trolley frame 100, with both ends connected to the push rod and the seat frame 3, respectively. When the trolley frame 100 is unfolded, the second connecting rod 5 can pull the seat frame 3 to prevent it from rotating towards the trolley base frame 1, thus improving the positional stability and load-bearing capacity of the seat frame 3. Simultaneously, the second connecting rod 5 is hinged to the push rod frame 2, and the other end of the second connecting rod 5 away from the push rod frame 2 is hinged to the sliding member 31 set on the seat frame 3. The sliding member 31 can slide closer to or away from the pivot axis of the seat frame 3. The cooperation method between the sliding member 31 and the seat frame 3 can refer to the aforementioned embodiment. In this arrangement, when the push rod frame 2 is rotated to fold the push rod frame 2 onto the trolley base frame 1, as the push rod frame 2 rotates, since the seat frame 3 is connected to the push rod frame 2 through the second connecting rod 5, it will simultaneously push the seat frame 3 toward the trolley base frame 1. At the same time, the sliding member 31 will drive one end of the second connecting rod 5 onto the seat frame 3. The sliding mechanism moves away from the pivot axis of the seat frame 3, allowing the seat frame 3 and the second link 5 to fold simultaneously with the folding of the push rod frame 2. This makes the folding process more convenient and eliminates the need to remove the second link 5. When the push rod frame 2 is unfolded relative to the trolley base frame 1, as the push rod frame 2 rotates, the sliding member 31 will drive one end of the second link 5 to slide on the seat frame 3 towards the pivot axis of the seat frame 3. This automatically drives the second link 5 to unfold and pull the seat frame 3, allowing the seat frame 3 to unfold relative to the trolley base frame 1. This simplifies the unfolding and folding processes of the trolley frame 100, improving ease of use.

[0089] In this embodiment, only one second link 5 can be provided to connect the push rod frame 2 and the seat frame 3, or at least two first links 4 can be provided, with at least two second links 5 arranged along the width direction of the trolley frame 100. For example, two second links 5 can be provided on both sides of the trolley frame 100, and the two ends of each second link 5 can be hinged to the push rod frame 2 and the sliding member 31, respectively. This arrangement can further improve the positional stability and load-bearing capacity of the seat frame 3 when the trolley frame 100 is unfolded. When at least two second links 5 are provided, at least two sliding members 31 can be provided on the seat frame 3 at intervals along the width direction, so that each second link 5 is hinged to the sliding member 31 located at the same width position. Alternatively, the sliding member 31 can extend along the width direction of the trolley frame 100, so that at least two second links 5 arranged side by side along the width direction are connected to the same sliding member 31. There is no limitation here.

[0090] Please refer to Figures 3 to 5 In some embodiments, the trolley frame 100 is equipped with both a first link 4 and a second link 5. The dual limiting effect of the first link 4 and the second link 5 further enhances the positional stability and load-bearing capacity of the seat frame 3 when the trolley frame 100 is unfolded. One end of the first link 4 and one end of the second link 5 can be connected to the same sliding member 31 on the seat frame 3, or at least two sliding members 31 can be provided on the seat frame 3 to connect to the first link 4 and the second link 5 respectively. Furthermore, with this configuration, when the trolley frame 100 needs to be unfolded or folded, simply rotating the push rod frame 2 drives the second link 5 to move the seat frame 3, which in turn moves the first link 4, achieving automatic unfolding and folding of the second link 5, the seat frame 3, and the first link 4, thus improving the ease of use of the trolley frame 100.

[0091] Please refer to Figures 3 to 5 In one embodiment, the trolley frame 100 includes a first link 4 and a second link 5, which are hinged to the same sliding member 31.

[0092] In this embodiment, the trolley frame 100 is equipped with both a first connecting rod 4 and a second connecting rod 5. The first connecting rod 4 is used to connect the trolley base frame 1 and the seat frame 3. One end of the first connecting rod 4 is hinged to the trolley base frame 1, and the other end is hinged to the sliding member 31 provided on the seat frame 3. The second connecting rod 5 is used to connect the push rod frame 2 and the seat frame 3. One end of the second connecting rod 5 is hinged to the push rod frame 2, and the other end is hinged to the sliding member 31 provided on the seat frame 3. Furthermore, one end of the first connecting rod 4 and one end of the second connecting rod 5 are connected to the same sliding member 31 on the seat frame 3, thereby reducing the number of components used in the trolley frame 100. When the trolley frame 100 is unfolded, the first connecting rod 4 supports the seat frame 3, and the second connecting rod 5 pulls the seat frame 3, which can further improve the positional stability and load-bearing capacity of the seat frame 3. When the stroller frame 100 needs to be unfolded or folded, simply rotate the push rod frame 2 to drive the second link 5 to move the seat frame 3, which in turn moves the first link 4, thus realizing the automatic unfolding and folding of the second link 5, the seat frame 3, and the first link 4, improving the ease of use of the stroller frame 100.

[0093] It should be noted that, in this embodiment of the application, at least two first links 4 and at least two second links 5 can be provided in the trolley frame 100. The at least two first links 4 and at least two second links 5 are respectively spaced apart along the width direction of the trolley frame 100. In this case, at least two sliding members 31 spaced apart along the width direction can be provided in the seat frame 3, so that the first links 4 and the second links 5 located at the same width position are connected to the sliding members 31 at that width position. Alternatively, the sliding members 31 can extend along the width direction of the trolley frame 100, so that the at least two first links 4 and the second links 5 arranged side by side along the width direction are connected to the same sliding member 31. This is not limited here.

[0094] Please refer to Figure 1 In one embodiment, the seat frame 3 includes two side rods 32 arranged side by side along the width direction and a crossbar 33 connecting the two side rods 32. One end of the side rod 32 is rotatably connected to the lower part of the push rod frame 2 or the end of the trolley base frame 1 near the lower part of the push rod frame 2, and the sliding member 31 is slidably connected to the side rod 32.

[0095] In this embodiment, the seat frame 3 includes two side rods 32 spaced apart along the width direction of the stroller frame 100, and a crossbar 33 is provided to connect the two side rods 32 to improve the overall structural strength and stability of the seat frame 3; and a clearance space can be formed in the middle of the seat frame 3 to facilitate the placement of the seat saddle assembly when the stroller frame 100 is used in a children's stroller. The sliding member 31 is slidably connected to the side rod 32. The sliding member 31 can be sleeved on the side rod 32, or a groove extending along the length direction of the side rod 32 can be provided on the side rod 32 for installing the sliding member 31.

[0096] Please refer to Figure 1 In one embodiment, the sliding member 31 is fitted onto the seat frame 3.

[0097] In this embodiment, the sliding member 31 is fitted onto the seat frame 3. This can be achieved by configuring the sliding member 31 as a collar structure extending along the width of the seat frame 3. In this case, the seat frame 3 only needs to have a roughly rectangular outline. The seat frame 3 can be a hollow frame, a plate-like structure, or other structures. Alternatively, if the seat frame 3 is configured as a frame, for example, in the above embodiment where the seat frame 3 has two side rods 32, the sliding member 31 can be fitted onto the side rods 32. By fitting the sliding member 31 onto the seat frame 3, the connection strength between the sliding member 31 and the seat frame 3 can be improved, reducing the risk of the sliding member 31 detaching from the seat frame 3 and improving the overall structural stability of the trolley frame 100.

[0098] Combined with reference Figure 3 and Figure 4 In one embodiment, the push rod holder 2 is telescopically oriented.

[0099] In this embodiment, the push rod frame 2 can be a rod-shaped structure, including at least two telescopic rods that are nested together; the push rod frame 2 can also be at least two plate-shaped structures that are slidably connected and nested or stacked; the push rod frame 2 can also be a frame structure with two connecting rods spaced apart along the width direction of the trolley frame 100, each connecting rod including at least two telescopic rods that are nested together. All these configurations allow the push rod frame 2 to be telescopic, thus providing a longer length when unfolded for easy gripping and pushing by the user, facilitating the use of the trolley frame 100; when the trolley frame 100 needs to be folded, retracting the push rod frame 2 can further reduce the volume and space occupied by the trolley frame 100.

[0100] This application also proposes a child stroller, including a seat assembly and a stroller frame 100 as described in any of the foregoing embodiments, wherein the seat assembly is disposed on the stroller frame 100. The specific structure of the stroller frame 100 is as described in the above embodiments. The seat assembly can be used for a child to sit on. Since this child stroller adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0101] The stroller also has an unfolded state and a folded state. In the folded state, the push rod frame 2 can be folded into the stroller base frame 1, for example, by rotating to fold, disassembling to fold, or retracting the push rod frame 2. In the stroller base frame 1, the wheel assembly 12 is set as a combination structure of support rod 121 and caster 122. The caster 122 is connected to the bottom bracket 11 through the support rod 121. The support rod 121 and the bottom bracket 11 can be movably connected, for example, the support rod 121 can rotate with its central axis as the pivot, the support rod 121 can rotate with one end of the support rod 121, or the support rod 121 can be folded, etc., so that the caster 122 can be flipped relative to the bottom bracket 11. It can also be combined with structures that make the support rod 121 telescopic and sliding. In addition, the caster 122 can be rotated relative to the bracket so that the caster 122 can be flipped relative to the bottom bracket 11 and the support rod 121. Thus, the caster 122 has an unfolded position and a stored position relative to the bottom bracket 11. When the caster 122 is in the unfolded position, the bottom support 11 can slide using the caster 122. When the caster 122 is in the retracted position, the caster 122 is rotated at a certain angle relative to the bottom support 11 and retracted into the bottom support 11, for example, retracted inside or below the bottom support 11, thereby achieving the purpose of making the caster 122 foldable. Furthermore, by rotating the caster 122 relative to the bottom support 11, the size of the caster 122 in the height direction of the trolley support is reduced, further reducing the volume of the trolley base 1 after the caster 122 is folded. In addition, this makes the trolley base 1 more stable when placed on the platform, avoiding the risk of automatic translation due to the rolling of the wheel assembly 12.

[0102] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A trolley frame, characterized in that, include: The bottom bracket has a receiving space formed inside for accommodating the caster, and an opening of the receiving space is provided on the side of the bottom bracket. The bottom bracket is also provided with a plug-in hole. and A wheel assembly, comprising a connected support rod and a caster, at least a portion of the support rod being inserted into the insertion hole, the support rod being slidably connected to the bottom bracket, the sliding direction of the support rod relative to the bottom bracket being the same as the length direction of the support rod, the support rod being movably connected to at least one of the bottom bracket and the caster, such that the caster is rotatably disposed at least relative to the bottom bracket and has an unfolded position and a retracted position; When the caster is in the receiving position, it is received in the receiving space, and the caster can enter and exit the receiving space through the opening on the side of the bottom bracket by extending and retracting the support rod.

2. The trolley base frame as described in claim 1, characterized in that, The support rod is rotatably connected to the bottom bracket, and the rotation axis of the support rod is parallel to the length direction of the support rod. The support rod rotates relative to the bottom bracket to drive the caster to flip relative to the bottom bracket.

3. The trolley base frame as described in claim 1, characterized in that, The wheel assembly also includes a caster bracket, which is connected to the support rod; When the trolley base is in the unfolded state, the caster bracket extends downward from the support rod, and the caster is located at the lower end of the caster bracket.

4. The trolley base frame as described in claim 3, characterized in that, The caster bracket is rotatably connected to the support rod, so that the caster bracket and the caster can be flipped relative to the support rod and the bottom bracket.

5. The trolley frame as described in any one of claims 1 to 4, characterized in that, The bottom support is a base or plate structure, and the bottom surface of the bottom support has an opening for the accommodating space; Alternatively, the bottom support can be a frame structure, and the casters can be housed inside the frame structure or below the frame structure.

6. A stroller frame, characterized in that, It includes a push rod frame and a trolley base frame as described in any one of claims 1 to 5, wherein the lower part of the push rod frame is rotatably connected to the trolley base frame, and the push rod frame is rotatably foldable into the trolley base frame.

7. The cart frame as described in claim 6, characterized in that, The trolley frame also includes a seat frame, one end of which is rotatably connected to the trolley base frame or the push rod frame; When the trolley frame is in the unfolded state, the seat frame is located between the trolley base frame and the push rod frame along the rotation direction of the push rod frame; When the trolley frame is in the folded state, the seat frame is folded into the trolley base frame and the push rod frame.

8. The trolley frame as described in claim 7, characterized in that, The seat frame is rotatably connected to the lower part of the push rod frame or to one end of the trolley base frame near the lower part of the push rod frame. The trolley frame also includes a first connecting rod, one end of which is hinged to the trolley base frame, and the other end of which is hinged to a sliding member on the seat frame. The sliding member can slide closer to or away from the pivot axis of the seat frame. And / or, the trolley frame includes a second link, one end of which is hinged to the push rod frame, and the other end of which is hinged to a sliding member provided on the seat frame, the sliding member being slidable toward or away from the pivot axis of the seat frame.

9. The trolley frame as described in claim 8, characterized in that, The trolley frame includes a first link and a second link, which are hinged to the same sliding member; And / or, the seat frame includes two side rods arranged side by side along the width direction and a crossbar connecting the two side rods, one end of the side rod is rotatably connected to the lower part of the push rod frame or the end of the trolley base frame near the lower part of the push rod frame, and the sliding member is slidably connected to the side rod; And / or, the sliding element is fitted onto the seat frame.

10. The trolley frame as described in any one of claims 6 to 9, characterized in that, The push rod frame is retractable.

11. A child stroller, characterized in that, It includes a seat assembly and a stroller frame as described in any one of claims 6 to 10, wherein the seat assembly is disposed on the stroller frame.

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