Stroller framework

Abstract

The utility model discloses a stroller framework which comprises a bottom supporting frame, the bottom supporting frame comprises a first supporting leg and a second supporting leg, wheels are arranged at the lower end of the first supporting leg and the lower end of the second supporting leg, a first connecting base is arranged at the upper end of the first supporting leg, and the upper end of the second supporting leg is rotatably connected to the first connecting base around a first axis. The upper end of the bottom supporting frame is rotatably connected with a push rod assembly, and a linkage assembly capable of driving the first supporting leg and the second supporting leg to rotate and draw close to each other when the push rod assembly and the bottom supporting frame rotate and draw close to the bottom supporting frame is arranged between the push rod assembly and the bottom supporting frame. The seat frame and the first connecting base are rotatably connected around a third axis, and a transmission rod hinged to the seat frame and the push rod assembly and capable of driving the seat frame to rotate and draw close to the first supporting leg when the push rod assembly rotates and draws close to the bottom supporting frame is further arranged between the seat frame and the push rod assembly. The folding chair is simple in structure, flexible to fold and small in size after being folded.

Description

A stroller frame Technical Field

[0001] This utility model relates to a children's stroller frame. Background Technology

[0002] Strollers are a common product in the growth of infants and toddlers. Most strollers can be unfolded or folded. When unfolded, they are used for children to ride and travel, while when folded, they are easy to carry or store.

[0003] The stroller frame is a crucial component of a stroller, its structure determining the smoothness of its unfolding and folding, as well as the space it occupies when folded. Currently, stroller frame structures on the market vary considerably. Therefore, this invention provides a novel stroller frame that differs from existing technologies. Summary of the Invention [Summary of the Utility Model]

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a children's stroller frame that is simple in structure, flexible in folding, and small in size after folding.

[0005] This utility model is achieved through the following technical solution:

[0006] A stroller frame, movable from an unfolded position to a folded position after the locking device is unlocked, includes a bottom support frame. The bottom support frame includes a first support leg and a second support leg, both with wheels at their lower ends. The first support leg has a first connecting seat at its upper end. The upper end of the second support leg is rotatably connected to the first connecting seat around a first axis. A push rod assembly is rotatably connected to the upper end of the bottom support frame. A linkage assembly is provided between the push rod assembly and the bottom support frame, which drives the first and second support legs to rotate and move closer together when the push rod assembly rotates towards the bottom support frame. The stroller frame also includes a seat frame, rotatably connected to the first connecting seat around a third axis. A transmission rod is also provided between the seat frame and the push rod assembly, hinged to both, and drives the seat frame to rotate and move closer to the first support leg when the push rod assembly rotates towards the bottom support frame.

[0007] The push rod assembly includes a second connecting seat that is rotatably connected to the first connecting seat about a fourth axis. A lower push rod is fixedly connected to the second connecting seat, and a hand push rod that can move relative to the lower push rod is connected to the lower push rod.

[0008] One end of the transmission rod is hinged to the seat frame around the fifth axis, and the other end is hinged to the second connecting seat around the sixth axis.

[0009] The seat frame includes a seat post and an extension seat fixed to the seat post and extending obliquely downward, the extension seat being rotatably connected to a first connecting seat about the third axis.

[0010] The stroller frame also includes a handle, which is rotatably connected to a second connecting seat about the sixth axis.

[0011] The armrest and the transmission rod are rotatably connected. The armrest is provided with a receiving groove. The upper end of the transmission rod extends into the receiving groove and is hinged to the second connecting seat. The receiving groove has a first side wall and a second side wall. When the stroller frame is in the unfolded position, the first side wall abuts against one side of the transmission rod and the second side wall abuts against the other side of the transmission rod to position the armrest. The receiving groove also has a third side wall. During the process of the stroller frame moving from the unfolded position to the folded position, the armrest rotates relative to the transmission rod and reaches the position where the third side wall abuts against the transmission rod.

[0012] The second connecting seat is provided with a limiting step, and the armrest is provided with a support surface that can abut against the limiting step. When the stroller frame is in the unfolded position, the limiting step abuts against the support surface.

[0013] The linkage assembly includes a first linkage rod, a second linkage rod, and a third linkage rod. One end of the first linkage rod is hinged to the first support leg around the seventh axis, and the other end of the first linkage rod is hinged to the second linkage rod around the eighth axis. The upper end of the second linkage rod, away from the first linkage rod, is hinged to the second support leg around the ninth axis. The upper end of the third linkage rod is hinged to the second connecting seat around the tenth axis and offset from the fourth axis. The lower end of the third linkage rod is hinged to either the first or second linkage rod around the eighth axis.

[0014] The locking device includes a plurality of first locking slots arranged circumferentially on a first connecting seat, and a plurality of second locking slots arranged circumferentially on a second connecting seat. A locking gear capable of lateral movement and simultaneously engaging with the first and second locking slots is provided within the space enclosed by the first and second connecting seats. A movable block capable of rotation and lateral movement during rotation is provided between the locking gear and the second connecting seat to push the locking gear out of the second locking slot. A first return spring capable of pushing the locking gear to lateral reset is also provided between the locking gear and the first connecting seat.

[0015] The push rod and the lower push rod are slidably connected, and a locking device is provided between the push rod and the lower push rod to lock them together. The second connecting seat is provided with a sliding rod that can be pushed by the push rod when the push rod retracts into the lower push rod. The lower end of the sliding rod is provided with a pushing part that can push the movable block to rotate when it slides downward. The movable block is provided with multiple inclined grooves along the circumferential direction. The second connecting seat is provided with an inclined protrusion that cooperates with the inclined grooves and can push the movable block to move laterally when it rotates. The second connecting seat is also provided with a second return spring that can push the sliding rod to return to its original position.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. When the stroller frame of this utility model is folded, the push rod assembly rotates and moves closer to the bottom support frame, which in turn drives the first and second support legs to rotate and move closer together via the linkage assembly. During this process, the push rod assembly pushes the transmission rod and rotates relative to the transmission rod, which in turn pushes the seat frame and causes the seat frame to rotate relative to the first connecting seat, thereby causing the seat frame to fold closer to the first support leg. The entire stroller frame has a simple and compact structure, unfolds and folds smoothly and flexibly, and has a small folded size, making it easy to carry or store, and suitable for widespread application.

[0018] 2. The stroller frame of this utility model also includes a handle for children to grip and ensure safety. The handle, transmission rod, and second connecting seat are rotatably connected. When the stroller frame is in the unfolded position, the first and second side walls of the handle abut against both sides of the transmission rod. At this time, the transmission rod can position the handle, keeping it in the unfolded position for children to grip. When the stroller frame moves from the unfolded position to the folded position, the handle, transmission rod, and second connecting seat rotate relative to each other, and the third side wall of the handle gradually abuts against one side of the transmission rod, allowing the handle to be compactly folded and stored.

[0019] 3. The seat frame of this utility model includes a seat rod and an extension seat fixed on the seat rod. The extension seat extends obliquely downward and is rotatably connected to the first connecting seat. Therefore, while ensuring that the stroller frame structure is simple and compact, the seat frame can also be folded or unfolded smoothly. Figure Description

[0020] Figure 1 is one of the perspective views of this utility model;

[0021] Figure 2 is a second perspective view of this utility model;

[0022] Figure 3 is an enlarged view of point B in Figure 2;

[0023] Figure 4 is a side view of this utility model;

[0024] Figure 5 is a perspective view of the present invention during the folding process;

[0025] Figure 6 is a side view of the present invention during the folding process;

[0026] Figure 7 is a side view of the present invention in the folded position;

[0027] Figure 8 is one of the perspective views of the components of this utility model;

[0028] Figure 9 is a second perspective view of the components of this utility model;

[0029] Figure 10 is a partial sectional view of this utility model;

[0030] Figure 11 is one of the exploded views of the components of this utility model;

[0031] Figure 12 is the second exploded view of the components of this utility model. Detailed Implementation Methods

[0032] The present invention will be further described below with reference to the accompanying drawings:

[0033] As shown in Figures 1 to 7, a child stroller frame can be moved from an unfolded position to a folded position after the locking device is unlocked. In the unfolded position shown in Figure 1, a child can sit on it. Of course, when the child stroller frame is used as a child stroller, a seat cushion or other accessories need to be added to ensure the child's comfort. In the folded position shown in Figure 7, it is convenient for the user to carry or store it. For example, it can be placed in the trunk of a car for travel, or it can be carried on the shoulder with a strap.

[0034] As shown in Figures 1 to 7, the stroller frame includes a bottom support frame 1, which can be unfolded or folded to provide effective support on the ground. Specifically, the bottom support frame 1 includes a first support leg 11 and a second support leg 12. The lower ends of the first support leg 11 and the second support leg 12 are both provided with wheels 13. The upper end of the first support leg 11 is provided with a first connecting seat 14. The upper end of the second support leg 12 is rotatably connected to the first connecting seat 14 around a first axis A. The upper end of the bottom support frame 1 is rotatably connected with a push rod assembly 2. A linkage assembly 3 is provided between the push rod assembly 2 and the bottom support frame 1, which can drive the first support leg 11 and the second support leg 12 to rotate and move closer to each other when the push rod assembly 2 rotates and moves closer to the bottom support frame 1. When folding the stroller frame, first unlock the locking device. Then, as the push rod assembly 2 rotates and moves closer to the bottom support frame 1, the linkage assembly 3 drives the first support leg 11 and the second support leg 12 to rotate and move closer together. This achieves the linkage between the push rod assembly 2 and the bottom support frame 1, simplifying the folding operation. The locking device can be a traditional latch and hole engagement structure, or it can be a locking device with a specific structure as described in this embodiment. The specific structure of the locking device in this embodiment will be detailed later.

[0035] As shown in Figures 1 to 7, the stroller frame also includes a seat frame 4, which supports the seat for a child to sit on. The seat frame 4 is rotatably connected to the first connecting seat 14 around a third axis C. A transmission rod 5 is also provided between the seat frame 4 and the push rod assembly 2, hinged to both, and capable of driving the seat frame 4 to rotate towards the first support leg 11 when the push rod assembly 2 rotates towards the bottom support frame 1. During the folding process of the push rod assembly 2 rotating relative to the bottom support frame 1, the push rod assembly 2 pushes the transmission rod 5 and rotates relative to the transmission rod 5. The transmission rod 5 then pushes the seat frame 4, causing the seat frame 4 to rotate relative to the first connecting seat 14, thereby causing the seat frame 4 to fold towards the first support leg 11. Therefore, as long as the push rod assembly 2 rotates and folds relative to the bottom support frame 1, the bottom support frame 1 itself and the seat frame 4 can fold together, making the entire folding operation very simple and quick. Moreover, the entire stroller frame has a simple and compact structure, unfolds and folds smoothly and flexibly, and has a small folded size, making it easy to carry or store.

[0036] As shown in Figures 1 and 2, and Figures 4 to 7, the push rod assembly 2 includes a second connecting seat 21 rotatably connected to the first connecting seat 14 about the fourth axis D. A lower push rod 22 is fixedly connected to the second connecting seat 21, and a hand push rod 23 movable relative to the lower push rod 22 is connected to the lower push rod 22. The hand push rod 23 can be configured to be rotatably connected to the lower push rod 22 and can be unfolded or folded, or it can be configured to slide and extend relative to the lower push rod 22. In this embodiment, the hand push rod 23 is slidably disposed inside the lower push rod 22. When unfolded, the hand push rod 23 is pulled out, and when folded, the hand push rod 23 is retracted deeper into the lower push rod 22.

[0037] As shown in Figures 5, 6, 10 and 11, one end of the transmission rod 5 is hinged to the seat frame 4 around the fifth axis E, and the other end is hinged to the second connecting seat 21 around the sixth axis F.

[0038] As shown in Figures 3, 5 and 11, the seat frame 4 includes a seat rod 41 and an extension seat 42 fixed on the seat rod 41 and extending obliquely downward. The extension seat 42 is rotatably connected to the first connecting seat 14 around the third axis C, which ensures that the stroller frame structure is simple and compact while also ensuring that the seat frame 4 can be folded or unfolded smoothly.

[0039] This embodiment of the stroller frame also includes a handle 6 for easy gripping by children, ensuring safety. The handle 6 is rotatably connected to the second connecting seat 21 about the sixth axis F.

[0040] As shown in Figure 10, the armrest 6 is rotatably connected to the transmission rod 5. The armrest 6 is provided with a receiving groove 63. The upper end of the transmission rod 5 extends into the receiving groove 63 and is hinged to the second connecting seat 21. The receiving groove 63 has a first side wall 61 and a second side wall 62. When the stroller frame is in the unfolded position, the first side wall 61 abuts against one side of the transmission rod 5 and the second side wall 62 abuts against the other side of the transmission rod 5 to position the armrest 6. The receiving groove 63 also has a third side wall 64. During the process of the stroller frame moving from the unfolded position to the folded position, the armrest 6 rotates relative to the transmission rod 5 and reaches the position where the third side wall 64 abuts against the transmission rod 5. The upper end of the transmission rod 5 is inserted into the interior of the armrest 6 through the receiving slot 63, making assembly easy and allowing for a simple and compact stroller frame structure. When the stroller frame is in the unfolded position, the armrest 6 is positioned by the first side wall 61 abutting against one side of the transmission rod 5 and the second side wall 62 abutting against the other side of the transmission rod 5, keeping the armrest 6 in the unfolded position for the child to grip. When the stroller frame is folded, the armrest 6 can rotate relative to the transmission rod 5 until the third side wall 64 abuts against the transmission rod 5, allowing the armrest 6 to be compactly folded and stored.

[0041] As shown in Figures 8 and 9, the second connecting seat 21 is provided with a limiting step 24, and the armrest 6 is provided with a contact surface 65 that can abut against the limiting step 24. When the stroller frame is in the unfolded position, the limiting step 24 abuts against the contact surface 65 to limit the position of the armrest 6, so as to ensure that the armrest 6 remains in the unfolded position.

[0042] As shown in Figures 1, 3, and 12, the linkage assembly 3 includes a first linkage rod 31, a second linkage rod 32, and a third linkage rod 33. One end of the first linkage rod 31 is hinged to the first support leg 11 around the seventh axis G, and the other end of the first linkage rod 31 is hinged to the second linkage rod 32 around the eighth axis H. The upper end of the second linkage rod 32, away from the first linkage rod 31, is hinged to the second support leg 12 around the ninth axis I. The upper end of the third linkage rod 33 is hinged to the second connecting seat 21 around the tenth axis J and offset from the fourth axis D. The lower end of the third linkage rod 33 is hinged to either the first linkage rod 31 or the second linkage rod 32 around the eighth axis H. When the push rod assembly 2 rotates and folds, the second connecting seat 21 rotates relative to the first connecting seat 14 around the fourth axis D. At this time, the position of the second connecting seat 21 deviating from the first axis D pulls the third linkage rod 33 upward and rotates relative to the third linkage rod 33. The third linkage rod 33 pulls the position where the first linkage rod 31 and the second linkage rod 32 are connected to move upward. The lower end of the first linkage rod 31 and the lower end of the second linkage rod 32 pull the first support leg 11 and the second support leg 12 to rotate relative to each other and move closer together.

[0043] As shown in Figures 11 and 12, the locking device includes multiple first locking slots 71 arranged circumferentially on the first connecting seat 14, and multiple second locking slots 72 arranged circumferentially on the second connecting seat 21. A locking gear 73, capable of lateral movement and simultaneously engaging with the first and second locking slots 71 and 72, is provided within the space enclosed by the first and second connecting seats 14 and 21. A movable block 74, rotatable and capable of lateral movement during rotation, pushes the locking gear 73 to disengage from the second locking slots 72. A first return spring 75, capable of pushing the locking gear 73 to lateral reset, is also provided between the locking gear 73 and the first connecting seat 14. When unlocking is required, the movable block 74 is rotated, pushing the locking gear 73 laterally and disengaging it from the second locking slots 72. Once the locking gear 73 disengages from the second locking slots 72, the push rod assembly 2 can be pushed forward, causing the second connecting seat 21 to rotate relative to the first connecting seat 14, thereby folding the stroller frame. When the stroller is in the unfolded position, the second locking groove 72 and the first locking groove 71 simultaneously engage with the locking gear 73. The first return spring 75 provides a certain holding force to the locking gear 73, thereby keeping the stroller frame in the unfolded position. In this embodiment, the push rod 23 and the lower push rod 22 are slidably connected. When folding the stroller frame, the push rod 23 is first retracted into the lower push rod 22. A locking element (not shown in the figure) is provided between the push rod 23 and the lower push rod 22 to lock them together. The locking element can be a traditional pin and a locking hole, which will not be described in detail here.

[0044] As shown in Figures 11 and 12, the second connecting seat 21 is provided with a sliding rod 76 that can be pushed by the push rod 23 when the push rod 23 retracts into the push rod 22. The lower end of the sliding rod 76 is provided with a pushing part 77 that can push the movable block 74 to rotate when it slides downward. The movable block 74 is provided with a plurality of inclined grooves 78 along the circumferential direction. The second connecting seat 21 is provided with an inclined protrusion 79 that cooperates with the inclined grooves 78 and can push the movable block 74 to move laterally when it rotates. The second connecting seat 21 is also provided with a second return spring 70 that can push the sliding rod 76 to return to its original position. When the push rod 23 retracts downward to the depth of the push rod 22, the lower end of the push rod 23 pushes the sliding rod 76 downward, and the pushing part 77 at the lower end of the sliding rod 76 pushes the movable block 74 to rotate. The bottom of the inclined groove 78 on the movable block 74 slides relative to the inclined protrusion 79 on the second connecting seat 21. The inclined protrusion 79 pushes the movable block 74 to move laterally, thereby pushing the locking gear 73 to disengage from the second locking groove 72 and unlock it. At this time, the push rod assembly 2 can be rotated to realize the folding of the stroller frame.

[0045] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A stroller frame that can move from an unfolded position to a folded position after the locking device is unlocked, characterized in that: The system includes a bottom support frame (1), which includes a first support leg (11) and a second support leg (12). Both the first support leg (11) and the second support leg (12) have wheels (13) at their lower ends. The first support leg (11) has a first connecting seat (14) at its upper end. The upper end of the second support leg (12) is rotatably connected to the first connecting seat (14) around a first axis (A). A push rod assembly (2) is rotatably connected to the upper end of the bottom support frame (1). The push rod assembly (2) is connected to the bottom support frame (1). The stroller frame is provided with a linkage assembly (3) that can drive the first support leg (11) and the second support leg (12) to rotate and move closer to each other when it rotates and moves closer to the bottom support frame (1). The stroller frame also includes a seat frame (4). The seat frame (4) and the first connecting seat (14) are rotatably connected around the third axis (C). The seat frame (4) and the push rod assembly (2) are also provided with a transmission rod (5) that is hinged to both of them and can drive the seat frame (4) to rotate and move closer to the first support leg (11) when the push rod assembly (2) rotates and moves closer to the bottom support frame (1).

2. The stroller frame according to claim 1, characterized in that: The push rod assembly (2) includes a second connecting seat (21) rotatably connected to the first connecting seat (14) about the fourth axis (D), a lower push rod (22) is fixedly connected to the second connecting seat (21), and a hand push rod (23) movable relative to the lower push rod (22) is connected to the lower push rod (22).

3. The stroller frame according to claim 2, characterized in that: One end of the transmission rod (5) is hinged to the seat frame (4) around the fifth axis (E), and the other end is hinged to the second connecting seat (21) around the sixth axis (F).

4. The stroller frame according to claim 2 or 3, characterized in that: The seat frame (4) includes a seat rod (41) and an extension seat (42) fixed on the seat rod (41) and extending obliquely downward. The extension seat (42) is rotatably connected to the first connecting seat (14) about the third axis (C).

5. The stroller frame according to claim 2 or 3, characterized in that: It also includes a handrail (6), which is rotatably connected to the second connecting seat (21) about the sixth axis (F).

6. The stroller frame according to claim 5, characterized in that: The armrest (6) is rotatably connected to the transmission rod (5). The armrest (6) is provided with a receiving groove (63). The upper end of the transmission rod (5) extends into the receiving groove (63) and is hinged to the second connecting seat (21). The receiving groove (63) has a first side wall (61) and a second side wall (62). When the stroller frame is in the unfolded position, the first side wall (61) abuts against one side of the transmission rod (5) and the second side wall (62) abuts against the other side of the transmission rod (5) to position the armrest (6). The receiving groove (63) also has a third side wall (64). During the process of the stroller frame moving from the unfolded position to the folded position, the armrest (6) rotates relative to the transmission rod (5) to reach the position where the third side wall (64) abuts against the transmission rod (5).

7. The stroller frame according to claim 6, characterized in that: The second connecting seat (21) is provided with a limiting step (24), and the armrest (6) is provided with a contact surface (65) that can abut against the limiting step (24). When the stroller frame is in the unfolded position, the limiting step (24) abuts against the contact surface (65).

8. The stroller frame according to claim 2 or 3, characterized in that: The linkage assembly (3) includes a first linkage rod (31), a second linkage rod (32), and a third linkage rod (33). One end of the first linkage rod (31) is hinged to the first support leg (11) around the seventh axis (G), and the other end of the first linkage rod (31) is hinged to the second linkage rod (32) around the eighth axis (H). The upper end of the second linkage rod (32) away from the first linkage rod (31) is hinged to the second support leg (12) around the ninth axis (I). The upper end of the third linkage rod (33) is hinged to the second connecting seat (21) around the tenth axis (J) and offset from the fourth axis (D). The lower end of the third linkage rod (33) is hinged to the first linkage rod (31) or the second linkage rod (32) around the eighth axis (H).

9. The stroller frame according to claim 2, characterized in that: The locking device includes a plurality of first locking slots (71) arranged along the circumferential direction on the first connecting seat (14), and a plurality of second locking slots (72) arranged along the circumferential direction on the second connecting seat (21). A locking gear (73) that can move laterally and engage with the first locking slots (71) and the second locking slots (72) is provided in the space enclosed by the first connecting seat (14) and the second connecting seat (21). A movable block (74) that can rotate and move laterally during rotation to push the locking gear (73) to disengage from the second locking slot (72) is provided between the locking gear (73) and the second connecting seat (21). A first return spring (75) that can push the locking gear (73) to return laterally is also provided between the locking gear (73) and the first connecting seat (14).

10. The stroller frame according to claim 9, characterized in that: The push rod (23) is slidably connected to the push rod (22). A locking device is provided between the push rod (23) and the push rod (22) to lock them together. The second connecting seat (21) is provided with a sliding rod (76) that can be pushed by the push rod (23) when the push rod (23) retracts into the push rod (22). The lower end of the sliding rod (76) is provided with a pushing part (77) that can push the movable block (74) to rotate when it slides downward. The movable block (74) is provided with multiple inclined grooves (78) along the circumferential direction. The second connecting seat (21) is provided with an inclined protrusion (79) that cooperates with the inclined grooves (78) and can push the movable block (74) to move laterally when it rotates. The second connecting seat (21) is also provided with a second return spring (70) that can push the sliding rod (76) to reset.

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