A lightweight, compact stroller frame

Abstract

The utility model discloses a portable and small children's pushchair frame, linkage piece has realized " push rod subassembly folding - front leg rod synchronous folding " linkage mechanism: when the user removes the locking of pushchair joint by pushchair unlocking assembly, linkage piece will drive the synchronous folding of front leg rod around its rotation axis with the upper end of rear leg rod in the process of pushing push rod subassembly relative rear leg rod to rotate and fold back, so that the user only needs to operate the unlocking and folding action of push rod subassembly, and the synchronous folding of front leg rod can be automatically completed, the operation process is greatly simplified, especially suitable for the scene of one -hand operation when holding a baby, and the use efficiency is remarkably improved, and the space occupation of the folded children's pushchair frame can be effectively reduced, and the portable transportation demand can be satisfied, like satisfying the size requirement of carrying on the airplane.

Description

[Technical Field]

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

[0002] In infant travel scenarios, lightweight and portable strollers are a necessity for families. With the diversification of maternal and infant travel scenarios (such as airports and high-speed rail), the market demand for infant strollers that can be quickly folded and whose folded dimensions strictly comply with aviation / railway transport standards (such as the common airline carry-on baggage size limit of ≤1150mm in length) has surged. These strollers need to balance "portability" (small size when folded), "ease of operation" (folding with one hand or quickly), and "safety" (stable folding with no risk of accidental unlocking). However, existing technologies still have significant shortcomings in meeting these requirements.

[0003] 1. The folded dimensions are difficult to meet air transport standards, resulting in low space utilization.

[0004] While existing baby strollers claim to be "foldable," their folding logic is mostly "unidirectional folding"—that is, the push rod assembly flips backward relative to the rear leg, and the front and rear legs are only fixed by a simple rotational connection, without a coordinated folding mechanism. After folding, the front leg and push rod assembly often exhibit a "cross-misalignment" state due to the lack of synchronous constraint, causing the overall length to exceed the 1150mm limit (for example, after the push rod assembly flips backward 90°, the horizontal distance between its end and the bottom of the front leg may exceed 300mm; combined with the length of the rod itself, the total folded length can easily reach over 1300mm). Some products, in order to reduce size, require additional strap binding or folding steps (such as pressing the front leg inward), but such designs not only increase the complexity of operation but may also cause the structure to loosen after folding due to loose straps, even scratching the baby or damaging surrounding items.

[0005] 2. Poor smoothness of folding operation, resulting in a poor user experience.

[0006] Traditional baby strollers typically require two steps to fold: first, unlocking the push rod assembly and the rear leg (e.g., pressing the unlock button on the push rod) allows the push rod assembly to rotate backward relative to the rear leg; then, the front leg needs to be manually moved to fold backward around the rotation connection point at the top of the front and rear legs. This step-by-step operation presents two major drawbacks: First, users must simultaneously monitor the unlocking status of the push rod assembly and the rear leg, as well as the rotation angle of the front leg, making the operation cumbersome (especially when holding a baby). Incorrect operation sequence can easily lead to interference between the rods (e.g., forcibly folding the front leg before the push rod assembly is fully unlocked may cause jamming or breakage of plastic parts); second, the connection between the front and rear legs relies on a single rotation axis, lacking auxiliary limiting structures. When folded, the front leg is prone to drooping naturally due to gravity, causing the baby stroller to fail to maintain a compact shape after folding. Repeated angle adjustments are required to achieve the minimum size, further reducing usability.

[0007] Therefore, this utility model was developed to address the aforementioned problems. [Utility Model Content]

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a lightweight and compact stroller frame. Through a linkage mechanism, a "push rod assembly folding - front leg synchronous folding" mechanism is achieved: when the user unlocks the frame by releasing the locking assembly from the frame joints, and pushes the push rod assembly to rotate backward relative to the rear leg to fold, the linkage simultaneously drives the front leg to rotate backward around its axis of rotation with the upper end of the rear leg. Therefore, the user only needs to operate the unlocking and folding actions of the push rod assembly to automatically complete the synchronous folding of the front leg, greatly simplifying the operation process. This is especially suitable for scenarios where one-handed operation is required while holding a baby, significantly improving efficiency. It also effectively reduces the space occupied by the folded stroller frame, meeting portable transportation needs, such as meeting the size requirements for carrying on airplanes.

[0009] To solve the above-mentioned technical problems, this utility model provides a lightweight and compact children's stroller frame, comprising:

[0010] Front foot post 1;

[0011] Rear foot rod 2, the upper end of which is rotatably connected to the upper end of the front foot rod 1;

[0012] Push rod assembly 3, the lower part of which is rotatably connected to the upper part of the rear foot rod 2, forming a frame joint 4;

[0013] Linkage component 5, located between the front leg 1 and the lower end of the push rod assembly 3, is configured to link the front leg 1 to rotate and fold relative to the rear leg 2 during the rotation and folding process of the push rod assembly 3 relative to the rear leg 2.

[0014] A frame locking assembly 6 is provided on the frame joint 4 and is used to lock the frame joint 4.

[0015] The frame unlocking component 7 is mounted on the push rod assembly 3 and is used to be linked with the frame locking component 6.

[0016] As described above, a lightweight and compact stroller frame includes a rear leg joint block 41 located on the upper part of the rear leg bar 2 and a push rod joint block 42 located on the lower part of the push rod assembly 3 and rotatably connected to the rear leg joint block 41; the push rod joint block 42 extends to form a linkage drive part 421, which is linked to the front leg bar 1 through a linkage member 5.

[0017] As described above, in a lightweight and compact stroller frame, the front end of the linkage 5 is rotatably connected to the middle or upper part of the front leg 1, and the rear end of the linkage 5 is rotatably connected to the front end of the linkage drive unit 421.

[0018] As described above, a lightweight and compact stroller frame includes a guide assembly 43 between the rear leg joint block 41 and the push rod joint block 42. The guide assembly 43 includes a guide arc groove 431 eccentrically disposed on the rear leg joint block 41 and a guide protrusion 432 disposed on the push rod joint block 42 and movably placed within the guide arc groove 431. When the push rod assembly 3 is in the extended state relative to the rear leg 2, the guide protrusion 432 is in a blocking and positioning engagement with the extended blocking end wall 4311 of the guide arc groove 431. When the push rod assembly 3 is in the folded state relative to the rear leg 2, the guide protrusion 432 is in a blocking and positioning engagement with the folded blocking end wall 4312 of the guide arc groove 431.

[0019] As described above, a lightweight and compact children's stroller frame includes a frame locking assembly 6 comprising a frame locking part 61 disposed on a rear leg joint block 41 and a frame locking member 62 slidably disposed on a push rod joint block 42 and used for locking and engaging with the frame locking part 61. The frame locking member 62 is linked to the frame unlocking assembly 7.

[0020] As described above, a lightweight and compact stroller frame includes a frame unlocking assembly 7 comprising a frame unlocking member 71 movably mounted on a push rod assembly 3 and a frame unlocking linkage member 72 for linking the frame unlocking member 71 with a frame locking member 62. The frame unlocking member 71 is configured to act on the frame locking member 62 via the frame unlocking linkage member 72 as the push rod assembly 3 is folded.

[0021] As described above, a lightweight and compact stroller frame includes a push rod assembly 3 comprising a lower push rod 31 and an upper push rod 32. The lower end of the lower push rod 31 is rotatably connected to the upper part of the rear leg 2 via a frame joint 4. The upper part of the upper push rod 32 is movably connected to the lower part of the lower push rod 31. An upper push rod locking assembly 33 is provided between the upper push rod 32 and the lower push rod 31 to lock the upper push rod 32 relative to the lower push rod 31. An upper push rod unlocking assembly 34 is provided on the upper push rod 32 and is linked to the upper push rod locking assembly 33. The frame unlocking assembly 7 is configured such that when the upper push rod 32 is folded relative to the lower push rod 31, it is linked to the upper push rod 32, thereby linking the frame locking assembly 6 to release the locking state of the frame joint 4.

[0022] As described above, in a lightweight and compact stroller frame, the upper push rod locking assembly 33 is configured to lock the upper push rod 32 relative to the lower push rod 31 in an unfolded state, and is also configured to lock the upper push rod 32 relative to the lower push rod 31 in a folded state.

[0023] As described above, a lightweight and compact stroller frame is provided, wherein the upper end of the upper push rod 32 is rotatably connected to the lower end of the lower push rod 31; the upper push rod locking assembly 33 includes an upper push rod locking part 331 disposed on the upper end of the lower push rod 31 and an upper push rod locking member 332 slidably disposed on the upper push rod 32 and used for locking and engaging with the upper push rod locking part 331, and the upper push rod locking member 332 is linked to the upper push rod unlocking assembly 34.

[0024] As described above, in a lightweight and compact stroller frame, the distance between the two upper push rods 32 is greater than the distance between the two rear leg rods 2, so that the two rear leg rods 2 in the folded state are located between the inner sides of the two upper push rods 32.

[0025] As described above, a lightweight and compact stroller frame is provided, wherein a frame connector 40 for detachably connecting a child vehicle is connected to the frame joint 4, and a connector locking assembly 400 for locking the frame connector 40 relative to the frame joint 4 is provided between the frame connector 40 and the frame joint 4.

[0026] As described above, a lightweight and compact children's stroller frame includes a connector locking assembly 400 comprising a connector plug block 410 disposed on the frame joint 4 and a connector plug slot 420 disposed on the frame connector 40 and engaging with the connector plug block 410. The connector plug block 410 is provided with a locking slot 430, and the frame connector 40 is movably provided with a locking block 440 for elastically locking with the locking slot 430.

[0027] As described above, a lightweight and compact children's stroller frame has a front wheel assembly connected to the lower end of the front leg 1 and a rear wheel assembly connected to the lower end of the rear leg 2. The distance between the two front wheel assemblies is smaller than the distance between the two rear wheel assemblies, so that the two front wheel assemblies in the folded state are located between the inner sides of the two rear wheel assemblies.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. This utility model realizes a linkage mechanism of "puss rod assembly folding - front leg synchronous folding" through a linkage component: when the user unlocks the frame locking component to release the frame joint by the frame unlocking component, and pushes the push rod assembly to rotate backward relative to the rear leg to fold, the linkage component will synchronously drive the front leg to rotate backward around its rotation axis with the upper end of the rear leg to fold. Therefore, the user only needs to operate the unlocking and folding action of the push rod assembly to automatically complete the synchronous folding of the front leg, which greatly simplifies the operation process and is especially suitable for one-handed operation when holding a baby, significantly improving the efficiency of use.

[0030] 2. The front leg and push rod assemblies are synchronously constrained by the linkage during the folding process. The folding angle and trajectory height of the two are coordinated. After folding, the front leg, rear leg and push rod assemblies can fit tightly together, presenting a compact "stacked" shape, minimizing redundant space and ensuring that the total folded size is strictly controlled within 1150mm to meet the needs of portable transportation, such as meeting the size requirements for carrying on airplanes.

[0031] 3. The linkage drive unit is formed by extending the push rod joint block, which can directly transmit the force of the push rod assembly rotating around the frame joint to the linkage component, avoiding the force loss caused by the "multi-stage linkage" in the traditional design, and ensuring that the folding action of the front foot rod and the push rod assembly is synchronized and precise; in addition, the linkage drive unit and the push rod joint block are integrally molded, reducing the number of additional transmission components, reducing the overall volume of the frame joint, and providing more design space for controlling the folding size.

[0032] 4. In order to better meet the core requirements of "lightweight, portable, safe and multifunctional" stroller frames, the upper push rod and the lower push rod are movably connected. The frame unlocking component is configured so that when the upper push rod is folded relative to the lower push rod, it is linked to the upper push rod, thereby linking the frame locking component to release the locked state of the frame joint.

[0033] 5. To make the stroller frame lighter and ensure that the total folded size is strictly controlled within 1150mm, when the stroller frame is folded, the two rear legs are located between the inside of the two upper push rods, and the two front wheel sets are located between the inside of the two rear wheel sets. [Attached Image Description]

[0034] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0035] Figure 1 This is a perspective view of the present invention when a vehicle frame connector is connected.

[0036] Figure 2 This is a perspective view of the present invention without the vehicle frame connector.

[0037] Figure 3 This is a side view of the present invention in its unfolded state.

[0038] Figure 4 This is one of the perspective views of the present invention during the folding process.

[0039] Figure 5 This is one of the side views of the present invention during the folding process.

[0040] Figure 6 This is the second perspective view of the present invention during the folding process.

[0041] Figure 7 This is the second side view of the present invention during the folding process.

[0042] Figure 8 This is a cross-sectional view of the present invention.

[0043] Figure 9 for Figure 8 An enlarged diagram of A in the diagram.

[0044] Figure 10 for Figure 8 Enlarged diagram of B in the diagram.

[0045] Figure 11 This is one of the exploded views of this utility model.

[0046] Figure 12 This is the second exploded view of this utility model.

Detailed Implementation Methods

[0047] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0048] like Figure 1-12As shown, this utility model discloses a lightweight and compact children's stroller frame, including a front leg post 1, a rear leg post 2, a push rod assembly 3, a linkage 5, a frame locking assembly 6, and a frame unlocking assembly 7. The upper end of the rear leg post 2 is rotatably connected to the upper end of the front leg post 1; the lower part of the push rod assembly 3 is rotatably connected to the upper part of the rear leg post 2, forming a frame joint 4; the linkage 5 is located between the front leg post 1 and the lower end of the push rod assembly 3, and is configured to link the front leg post 1 to rotate and fold accordingly relative to the rear leg post 2 during the rotation and folding of the push rod assembly 3; the frame locking assembly 6 is located on the frame joint 4 and is used to lock the frame joint 4; the frame unlocking assembly 7 is located on the push rod assembly 3 and is linked with the frame locking assembly 6. This invention achieves a linkage mechanism of "puss rod assembly folding - front leg synchronous folding" through a linkage component: when the user unlocks the frame locking component by using the frame unlocking component, and pushes the push rod assembly to rotate backward relative to the rear leg to fold, the linkage component will simultaneously drive the front leg to rotate backward around its and the upper end of the rear leg to fold. Therefore, the user only needs to operate the unlocking and folding actions of the push rod assembly to automatically complete the synchronous folding of the front leg, greatly simplifying the operation process. It is especially suitable for one-handed operation when holding a baby, significantly improving efficiency. At the same time, the front leg and push rod assembly are synchronously constrained by the linkage component during the folding process, and their folding angles and trajectories are highly coordinated. After folding, the front leg, rear leg, and push rod assembly can fit tightly together, presenting a compact "stacked" shape, minimizing redundant space, and ensuring that the total folded size is strictly controlled within 1150mm to meet the needs of portable transportation, such as meeting the size requirements for carrying on airplanes.

[0049] like Figure 1-5 As shown in Figures 8, 11, and 12, the frame joint 4 includes a rear leg joint block 41 located on the upper part of the rear leg bar 2 and a push rod joint block 42 located on the lower part of the push rod assembly 3 and rotatably connected to the rear leg joint block 41. The push rod joint block 42 extends to form a linkage drive part 421, which is linked to the front leg bar 1 via a linkage member 5. This linkage drive part, formed by the extension of the push rod joint block, can directly transmit the force of the push rod assembly rotating around the frame joint to the linkage member, avoiding the force loss caused by the "multi-stage linkage turning" in traditional designs, and ensuring that the folding action of the front leg bar and the push rod assembly is synchronous and precise. In addition, the linkage drive part and the push rod joint block are integrally molded, reducing the number of additional transmission components, reducing the overall volume of the frame joint, and providing more design space for controlling the folding size.

[0050] like Figure 1-5As shown in Figures 8 and 11, to ensure smooth retraction and extension of the front leg, the front end of the linkage 5 is rotatably connected to the middle or upper part of the front leg 1, and the rear end of the linkage 5 is rotatably connected to the front end of the linkage drive unit 421. The rear end of the linkage 5 is directly connected to the front end of the linkage drive unit 421 of the push rod joint block 42, and the linkage drive unit 421 is the "force transmission fulcrum" when the push rod assembly 3 rotates around the frame joint 4. This design allows the rotational force generated when the push rod assembly 3 folds to be directly transmitted to the linkage 5 through the linkage drive unit 421, avoiding the force loss (such as friction loss or angle deviation) caused by "multi-stage linkage turning" or "long-distance transmission" in traditional designs. When the linkage 5 transmits the force to the connection point in the middle / upper part of the front leg 1, the force attenuation is minimal, and the user only needs to apply a small operating force to drive the front leg 1 to fold synchronously, which is especially suitable for scenarios where one hand is holding a baby, significantly improving the ease of operation.

[0051] like Figure 10-12 As shown, a guide assembly 43 is provided between the rear foot joint block 41 and the push rod joint block 42. The guide assembly 43 includes a guide arc groove 431 eccentrically disposed on the rear foot joint block 41 and a guide protrusion 432 disposed on the push rod joint block 42 and movably placed within the guide arc groove 431. When the push rod assembly 3 is in the extended state relative to the rear foot rod 2, the guide protrusion 432 is in a blocking and positioning engagement with the extended blocking end wall 4311 of the guide arc groove 431. When the push rod assembly 3 is in the retracted state relative to the rear foot rod 2, the guide protrusion 432 is in a blocking and positioning engagement with the retracted blocking end wall 4312 of the guide arc groove 431. The guide groove 431 and guide protrusion 432 provide a clear path constraint for the unfolding / folding movement of the push rod assembly 3. The directional sliding of the guide protrusion within the guide groove prevents the push rod assembly from wobbling or jamming during movement, ensuring the accuracy of the movement trajectory and thus improving the overall stability of the mechanism and reducing shaking or abnormal noise during operation. In addition, the guide protrusion 432 engages with the unfolding blocking end wall 4311 and the folding blocking end wall 4312 of the guide groove 431 respectively, providing a clear mechanical limit when the push rod assembly 3 is at its unfolding or folding limit position. This physical contact positioning avoids the relaxation failure problem that may occur with traditional elastic limits (such as springs), ensuring that the push rod assembly does not extend excessively when unfolding and does not accidentally inflate when folding, effectively preventing structural damage due to overtravel and improving safety.

[0052] like Figure 10-12As shown, for reliable locking, the frame locking assembly 6 includes a frame locking part 61 disposed on the rear leg joint block 41 and a frame locking member 62 slidably disposed on the push rod joint block 42 for locking engagement with the frame locking part 61. A frame locking elastic member is provided between the frame locking member 62 and the push rod joint block 42 for maintaining an elastic locking engagement between the frame locking member 62 and the frame locking part 61. The frame locking member 62 is linked to the frame unlocking assembly 7.

[0053] like Figure 9 , 12 As shown, for ease of unlocking, the frame unlocking assembly 7 includes a frame unlocking member 71 movably mounted on the push rod assembly 3 and a frame unlocking linkage member 72 for linking the frame unlocking member 71 with the frame locking member 62. The frame unlocking member 71 is configured to act on the frame locking member 62 via the frame unlocking linkage member 72 as the push rod assembly 3 folds down. To allow the frame unlocking member 71 to slide along a set path, the push rod 31 below the push rod assembly 3 is provided with an unlocking member guide groove 711 for guiding the movement path of the frame unlocking member 71.

[0054] like Figure 1-7 As shown in Figures 9, 11, and 12, in order to better meet the core requirements of "lightweight, portable, safe, and multifunctional" stroller frames, the push rod assembly 3 includes a lower push rod 31 and an upper push rod 32. The lower end of the lower push rod 31 is rotatably connected to the upper part of the rear leg 2 through the frame joint 4. The upper part of the upper push rod 32 is movably connected to the lower part of the lower push rod 31. An upper push rod locking assembly 33 is provided between the upper push rod 32 and the lower push rod 31 for locking the upper push rod 32 relative to the lower push rod 31. An upper push rod unlocking assembly 34 is provided on the upper push rod 32 and is linked to the upper push rod locking assembly 33. The frame unlocking assembly 7 is configured to be linked by the upper push rod 32 during the folding process of the upper push rod 32 relative to the lower push rod 31, thereby linking the frame locking assembly 6 to release the locking state of the frame joint 4.

[0055] like Figure 9 , 11 As shown in Figure 12, the upper push rod locking assembly 33 is configured to lock the upper push rod 32 relative to the lower push rod 31 in the unfolded state, and is also configured to lock the upper push rod 32 relative to the lower push rod 31 in the folded state. This embodiment uses the bidirectional locking function of the upper push rod locking assembly 33, making the application scenarios of the push rod assembly more flexible: when pushing daily, it is locked in the unfolded state to ensure stable pushing height, and parents do not need to make frequent adjustments; when temporarily placed, it is locked in the folded state, and the stroller frame can be stably placed on the ground (such as when changing diapers) to avoid tipping over; when transporting long distances, the structure is compact after folding and locking, and can be safely placed in the trunk of a car or carry-on luggage without additional fixation.

[0056] like Figure 9 , 11 As shown in Figure 12, for reliable locking, the upper end of the upper push rod 32 and the lower end of the lower push rod 31 are rotatably connected or slidably connected; the upper push rod locking assembly 33 includes an upper push rod locking part 331 disposed on the upper end of the lower push rod 31 and an upper push rod locking member 332 slidably disposed on the upper push rod 32 and used for locking cooperation with the upper push rod locking part 331. The upper push rod locking member 332 is linked with the upper push rod unlocking assembly 34.

[0057] like Figure 6 , 7 As shown, in order to make the stroller frame lighter, the distance between the two upper push rods 32 is greater than the distance between the two rear foot rods 2, so that the two rear foot rods 2 in the folded state are located between the inner sides of the two upper push rods 32.

[0058] like Figure 1 , 3 As shown, for convenient installation, stable connection, and scenario expansion of child-friendly vehicles, a frame connector 40 is connected to the frame joint 4 for detachable connection of the child-friendly vehicle. A connector locking assembly 400 is provided between the frame connector 40 and the frame joint 4 to lock the frame connector 40 relative to the frame joint 4. Specifically, the child-friendly vehicle can be a seat frame, a baby carrier, etc.

[0059] like Figure 11 As shown, for easy assembly and disassembly, the connector locking assembly 400 includes a connector plug block 410 disposed on the frame joint 4 and a connector plug slot 420 disposed on the frame connector 40 and engaging with the connector plug block 410. The connector plug block 410 is provided with a locking slot 430. The frame connector 40 is movably provided with a locking block 440 for elastically locking with the locking slot 430. The frame connector 40 is provided with a connector unlocking member 450. The middle part of the connector unlocking member 450 is rotatably connected to the frame connector 40. The locking block 440 is disposed at the lower part of the connector unlocking member 450. A return spring is provided between the upper part of the connector unlocking member 450 and the frame connector 40. During unlocking, the user presses the upper part of the connector unlocking part 450, causing the lower part of the connector unlocking part 450 to drive the locking block 440 to move outward around the rotation axis between the middle part of the connector unlocking part 450 and the frame connector 40, thereby causing the locking block 440 to separate from the locking slot 430, releasing the locked state of the frame connector 40 relative to the frame joint 4, and then the frame connector 40 can be removed from the frame joint 4.

[0060] like Figure 6 , 7As shown, in order to make the stroller frame lighter, the lower end of the front leg 1 is connected to the front wheel assembly, and the lower end of the rear leg 2 is connected to the rear wheel assembly. The distance between the two front wheel assemblies is smaller than the distance between the two rear wheel assemblies, so that the two front wheel assemblies in the folded state are located between the inner sides of the two rear wheel assemblies.

Claims

1. A lightweight and compact children's stroller frame, characterized in that... include: Front foot pole (1); Rear leg (2), the upper end of which is rotatably connected to the upper end of the front leg (1); A push rod assembly (3) is rotatably connected between the lower part of the push rod assembly (3) and the upper part of the rear foot rod (2) to form a frame joint (4); Linkage component (5), the linkage component (5) is located between the front leg rod (1) and the lower end of the push rod assembly (3), the linkage component (5) is configured to link the front leg rod (1) to rotate and fold relative to the rear leg rod (2) during the rotation and folding process of the push rod assembly (3) relative to the rear leg rod (2); A frame locking assembly (6) is provided on the frame joint (4) for locking the frame joint (4); The frame unlocking assembly (7) is located on the push rod assembly (3) and is used to be linked with the frame locking assembly (6).

2. The lightweight and compact stroller frame according to claim 1, characterized in that... The frame joint (4) includes a rear foot joint block (41) located on the upper part of the rear foot bar (2) and a push rod joint block (42) located on the lower part of the push rod assembly (3) and rotatably connected to the rear foot joint block (41); the push rod joint block (42) extends to form a linkage drive part (421), and the linkage drive part (421) is linked to the front foot bar (1) through a linkage member (5).

3. The lightweight and compact stroller frame according to claim 2, characterized in that... The front end of the linkage (5) is rotatably connected to the middle or upper part of the front foot rod (1), and the rear end of the linkage (5) is rotatably connected to the front end of the linkage drive unit (421).

4. The lightweight and compact stroller frame according to claim 2, characterized in that... A guide assembly (43) is provided between the rear foot joint block (41) and the push rod joint block (42). The guide assembly (43) includes a guide arc groove (431) eccentrically provided on the rear foot joint block (41) and a guide protrusion (432) provided on the push rod joint block (42) and movably placed in the guide arc groove (431). When the push rod assembly (3) is in the unfolded state relative to the rear foot rod (2), the guide protrusion (432) and the unfolding blocking end wall (4311) of the guide arc groove (431) are in a blocking and positioning cooperation. When the push rod assembly (3) is in the folded state relative to the rear foot rod (2), the guide protrusion (432) and the folding blocking end wall (4312) of the guide arc groove (431) are in a blocking and positioning cooperation.

5. The lightweight and compact stroller frame according to claim 2, characterized in that... The frame locking assembly (6) includes a frame locking part (61) provided on the rear foot joint block (41) and a frame locking member (62) slidably provided on the push rod joint block (42) and used for locking and engaging with the frame locking part (61). The frame locking member (62) is linked to the frame unlocking assembly (7).

6. The lightweight and compact stroller frame according to claim 5, characterized in that... The frame unlocking assembly (7) includes a frame unlocking member (71) movably mounted on the push rod assembly (3) and a frame unlocking linkage member (72) for linking the frame unlocking member (71) with the frame locking member (62). The frame unlocking member (71) is configured to act on the frame locking member (62) through the frame unlocking linkage member (72) as the push rod assembly (3) folds down.

7. A lightweight and compact stroller frame according to any one of claims 1-6, characterized in that... The push rod assembly (3) includes a lower push rod (31) and an upper push rod (32). The lower end of the lower push rod (31) is rotatably connected to the upper part of the rear foot rod (2) through the frame joint (4). The upper part of the upper push rod (32) is movably connected to the lower part of the lower push rod (31). An upper push rod locking assembly (33) for locking the upper push rod (32) relative to the lower push rod (31) is provided between the upper push rod (32) and the lower push rod (31). An upper push rod unlocking assembly (34) is provided on the upper push rod (32) and is linked to the upper push rod locking assembly (33). The frame unlocking assembly (7) is configured to be linked by the upper push rod (32) during the folding process of the upper push rod (32) relative to the lower push rod (31), thereby linking the frame locking assembly (6) to release the locking state of the frame joint (4).

8. The lightweight and compact stroller frame according to claim 7, characterized in that... The upper push rod locking assembly (33) is configured to lock the upper push rod (32) relative to the lower push rod (31) in an unfolded state, and is also configured to lock the upper push rod (32) relative to the lower push rod (31) in a folded state.

9. The lightweight and compact stroller frame according to claim 7, characterized in that... The upper end of the upper push rod (32) is rotatably connected to the lower end of the lower push rod (31); the upper push rod locking assembly (33) includes an upper push rod locking part (331) disposed on the upper end of the lower push rod (31) and an upper push rod locking member (332) slidably disposed on the upper push rod (32) and used for locking and engaging with the upper push rod locking part (331); the upper push rod locking member (332) is linked to the upper push rod unlocking assembly (34).

10. A lightweight and compact stroller frame according to claim 7, characterized in that... The distance between the two upper push rods (32) is greater than the distance between the two rear foot rods (2), so that the two rear foot rods (2) in the folded state are located between the inner sides of the two upper push rods (32).

11. The lightweight and compact stroller frame according to claim 1, characterized in that... The frame joint (4) is connected to a frame connector (40) for detachable connection of a child vehicle, and a connector locking assembly (400) is provided between the frame connector (40) and the frame joint (4) for locking the frame connector (40) relative to the frame joint (4).

12. The lightweight and compact stroller frame according to claim 11, characterized in that... The connector locking assembly (400) includes a connector plug block (410) disposed on the frame joint (4) and a connector plug slot (420) disposed on the frame connector (40) and engaged with the connector plug block (410). The connector plug block (410) is provided with a locking slot (430), and the frame connector (40) is movably provided with a locking block (440) for elastically locking with the locking slot (430).

13. The lightweight and compact stroller frame according to claim 1, characterized in that... The lower end of the front foot rod (1) is connected to the front wheel assembly, and the lower end of the rear foot rod (2) is connected to the rear wheel assembly. The distance between the two front wheel assemblies is smaller than the distance between the two rear wheel assemblies, so that the two front wheel assemblies in the folded state are located between the inner sides of the two rear wheel assemblies.

Images