A children's stroller frame

Abstract

This invention discloses a stroller frame, including a frame body and a seat connection assembly. The child seat is connected to the frame body via the seat connection assembly. Before folding the entire stroller, the child seat is folded first. Then, the frame body is unlocked, and the frame body is rotated to fold. The frame body unlocks the seat locking mechanism via a linkage seat unlocking mechanism, thereby releasing the locking state of the seat connection assembly relative to the frame body. This allows the child seat to rotate and fold relative to the frame body, thus completing the overall folding of the stroller frame. This design features reliable unlocking and convenient use.

Description

Technical Field

[0001] This invention relates to a stroller frame. Background Technology

[0002] Currently, many children's cars on the market include a foldable car frame and a foldable child seat attached to the car frame.

[0003] The aforementioned strollers include both one-button folding and step-by-step folding designs. For the one-button folding design, such as the one disclosed in Chinese patent CN107428355B, folding involves manually operating the backrest unlocking mechanism to release the lock between the backrest and the seat. Then, the backrest is rotated towards the seat to fold the child seat. When the backrest reaches a predetermined angle relative to the seat, the seat unlocks relative to the frame. After unlocking, the seat flips under gravity, further unlocking the frame joints, ultimately achieving one-button folding of the entire stroller. However, this design requires high precision in its linkage and demands high manufacturing accuracy, lifespan, and assembly quality for related components. Therefore, this design results in higher manufacturing costs, hindering product competitiveness. Furthermore, during use, fatigue wear of components and assembly gaps can easily lead to folding jams.

[0004] The step-by-step folding design involves first manually operating the backrest unlocking mechanism to release the lock between the backrest and the seat. Then, the backrest is rotated towards the seat to fold the child seat. After the backrest is folded onto the seat, the lock between the seat and the frame is released. Once the seat is unlocked relative to the frame, it flips under gravity, triggering the frame joints to unlock and ultimately folding the entire vehicle. While this design involves step-by-step operation, it offers high reliability and stability, and its manufacturing cost is relatively economical, giving the product a strong market competitiveness. However, this structure also had a problem: since the seat flips under gravity after unlocking, insufficient weight from the seat cannot drive the frame to unlock, resulting in folding jamming. Designing the seat to have greater weight would increase the overall weight of the vehicle, making it inconvenient to carry.

[0005] Therefore, this invention addresses the aforementioned problems. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stroller frame that allows the main body of the frame to be manually released from its locking state. Then, the main body of the frame unlocks the seat locking mechanism through a linkage seat unlocking mechanism, thereby releasing the locking state of the seat connecting component relative to the main body of the frame. The child seat then rotates and folds relative to the main body of the frame, thus completing the overall folding of the stroller. This invention is reliable in operation and convenient in use.

[0007] To solve the above-mentioned technical problems, the present invention provides a stroller frame, comprising:

[0008] The frame body 1 can be switched from an unfolded state to a folded state;

[0009] Seat connection assembly 2, which is used to connect with a child seat 5 with folding and unfolding functions, is rotatably connected to the frame body 1, and a seat locking mechanism 3 is provided between the seat connection assembly 2 and the frame body 1 for locking the seat connection assembly 2 relative to the frame body 1.

[0010] The seat unlocking mechanism 4 is located between the frame body 1 and the seat connection assembly 2. The seat unlocking mechanism 4 is configured to be able to release the seat locking mechanism 3 by linkage with the frame body 1 when the frame body 1 changes from the unfolded state to the folded state, thereby releasing the locking state of the seat connection assembly 2 relative to the frame body 1.

[0011] As described above, a children's bicycle frame includes a frame body 1 comprising a front leg 11, a rear leg 12, and a handlebar 15. The upper ends of the front leg 11, the rear leg 12, and the handlebar 15 are rotatably connected via a frame joint assembly. The seat unlocking mechanism 4 is configured to release the seat locking mechanism 3 by means of the handlebar 15 when the handlebar 15 changes from an unfolded state to a folded state.

[0012] Alternatively, the frame body 1 includes a front leg 11, a rear leg 12, a connecting rod 13, a support rod 14, and a handlebar 15. The upper end of the front leg 11 is rotatably connected to the upper end of the rear leg 12; the lower end of the connecting rod 13 is rotatably connected to the upper end of the rear leg 12, and the upper end of the connecting rod 13 is rotatably connected to the middle of the handlebar 15; the lower end of the support rod 14 is rotatably connected to the upper part of the rear leg 12, and the upper end of the support rod 14 is rotatably connected to the lower end of the handlebar 15; the frame body 1 also includes a frame locking mechanism 16 for locking the frame body 1 in an unfolded state and a frame unlocking mechanism 17 for unlocking the frame locking mechanism 16; the seat unlocking mechanism 4 is configured to release the seat locking mechanism 3 by linkage with the support rod 14 during the process of changing the support rod 14 from an unfolded state to a folded state.

[0013] As described above, in a stroller frame, the lower part of the support rod 14 is provided with a support drive part 140 for linkage with the seat unlocking mechanism 4 when the support rod 14 changes from an unfolded state to a folded state.

[0014] As described above, the main body 1 of the stroller frame further includes a front leg linkage mechanism 18 located between the front leg bar 11 and the support bar 14. The front leg linkage mechanism 18 is configured to be linked by the support bar 14 when the support bar 14 changes from an unfolded state to a folded state, thereby linking the front leg bar 11 to rotate and fold towards the rear leg bar 12.

[0015] As described above, in a children's stroller frame, the front foot linkage mechanism 18 includes a front linkage rod 181 and a rear linkage rod 182. The front end of the front linkage rod 181 is rotatably connected to the front foot rod 11, and the rear end of the front linkage rod 181 is rotatably connected to the front end of the rear linkage rod 182. The rear end of the rear linkage rod 182 is relatively fixedly connected to the lower end of the support rod 14.

[0016] As described above, in a children's bicycle frame, the frame locking mechanism 16 is located between the connecting rod 13 and the handlebar 15, and the frame locking mechanism 16 is configured to lock the handlebar 15 relative to the connecting rod 13.

[0017] As described above, in a children's bicycle frame, the frame locking mechanism 16 includes frame locking grooves 161 respectively provided on opposite sides of the connecting rod 13 and the handlebar 15. A frame locking gear 162 is provided between the connecting ends of the connecting rod 13 and the handlebar 15, which can slide laterally and simultaneously engage with the frame locking grooves 161 on the connecting rod 13 and the handlebar 15. A frame locking elastic element 163 is provided between the frame locking gear 162 and the corresponding end of the connecting rod 13, which enables the frame locking gear 162 to simultaneously engage with the frame locking grooves 161 on the connecting rod 13 and the handlebar 15. The frame locking gear 162 is configured to be disengaged from the frame locking grooves 161 on the handlebar 15 by linkage with the frame unlocking mechanism 17.

[0018] As described above, in a children's bicycle frame, the frame unlocking mechanism 17 includes a frame unlocking turntable 171 rotatably disposed between the handlebar 15 and the frame locking gear 162, capable of pushing the frame locking gear 162 out of the frame locking groove 161 of the handlebar 15. The frame unlocking turntable 171 and the handlebar 15 are respectively provided with frame unlocking inclined surfaces 1711 on opposite sides for laterally sliding the frame unlocking turntable 171 when it rotates. The frame unlocking mechanism 17 also includes a frame unlocking operating component 173 disposed on the handlebar 15, which is connected to the frame unlocking turntable 171 via a frame unlocking pull rope 172.

[0019] In the stroller frame described above, the seat locking mechanism 3 is located between the seat connecting assembly 2 and the rear footrest 12; the seat unlocking mechanism 4 is located on the rear footrest 12.

[0020] As described above, in a stroller frame, the seat locking mechanism 3 includes seat locking grooves 31 respectively provided on opposite sides of the seat connecting assembly 2 and the rear leg 12. A seat locking gear 32 is provided between the seat connecting assembly 2 and the rear leg 12, which can slide laterally and simultaneously engage with the seat locking grooves 31 on both the seat connecting assembly 2 and the rear leg 12. A seat locking elastic element 33 is provided between the seat locking gear 32 and the seat connecting assembly 2, which allows the seat locking gear 32 to simultaneously engage with the seat locking grooves 31 on both the seat connecting assembly 2 and the rear leg 12. The seat locking gear 32 is configured to be disengaged from the seat locking grooves 31 on the rear leg 12 by a linkage with the seat unlocking mechanism 4.

[0021] As described above, in a stroller frame, the seat unlocking mechanism 4 includes a seat unlocking slider 41 that is slidably mounted on the rear foot bar 12 and can push the seat locking gear 32 to slide laterally. The seat unlocking slider 41 and the rear foot bar 12 are respectively provided with seat unlocking inclined surfaces 411 for the seat unlocking slider 41 to slide laterally when it slides. The seat unlocking slider 41 is directly or indirectly provided with a seat unlocking pin 412 for the lower part of the support rod 14 to push the seat unlocking shaft pin 412.

[0022] As described above, in a stroller frame, a seat unlocking push rod 42 is slidably provided on the rear leg 12, and a seat unlocking pin 412 is fixedly provided on the seat unlocking push rod 42. When the lower part of the support rod 14 pushes the seat unlocking pin 412, the seat unlocking pin 412 pushes the seat unlocking push rod 42 to slide relative to the rear leg 12, and the seat unlocking push rod 42 in turn pushes the seat unlocking slider 41 to slide.

[0023] As described above, in a stroller frame, the child seat 5 includes a seat portion 51, a backrest 52, and an armrest portion 54 for connection with a seat connection assembly 2. The lower end of the backrest 52 is rotatably connected to the seat portion 51. A backrest locking mechanism 53 for locking the backrest 52 relative to the seat portion 51 and a backrest unlocking mechanism 534 for unlocking the backrest locking mechanism 53 are provided between the backrest 52 and the seat portion 51. The armrest portion 54 is rotatably connected to the seat portion 51 and located in front of the backrest 52. An armrest retraction control mechanism 55 is provided between the armrest portion 54 and the backrest 52. The armrest retraction control mechanism 55 is configured to cause the backrest 52 to rotate and retract relative to the seat portion 51 when the backrest 52 rotates forward and folds to a preset angle relative to the seat portion 51, and to cause the backrest to rotate and retract relative to the seat portion when the backrest 52 rotates backward and unfolds to a preset angle relative to the seat portion 51.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. This invention provides a stroller frame that connects to a child seat with a folding function via a seat connection assembly. Before folding the entire stroller, the child seat is folded first. Then, the main frame is unlocked, and the frame is rotated to fold. The frame unlocks the seat locking mechanism via a linkage seat unlocking mechanism, thereby releasing the locking state of the seat connection assembly relative to the frame, allowing the child seat to rotate and fold relative to the frame, thus completing the overall folding of the stroller frame. This invention features reliable unlocking and convenient use.

[0026] 2. In this invention, the rear leg rod, connecting rod, handlebar rod, and support rod form a four-bar linkage mechanism, as do the front leg rod, rear leg rod, front linkage rod, and rear linkage rod. These two four-bar linkage mechanisms, through the connection between the support rod and the rear linkage rod, form a linkage and retraction structure for the frame body. That is, as long as one of the above four-bar linkage mechanisms is locked, the other four-bar linkage mechanism is also locked and both are converted into a three-bar connection structure. This can improve the structural stability and reliability of the frame body. In addition, through the linkage of the above two four-bar linkage mechanisms, only one frame locking mechanism is required, thereby effectively simplifying the connection between the rods and featuring a simple structure and minimal overall weight.

[0027] 3. The seat unlocking mechanism is located on the rear footrest and is cleverly unlocked by the support drive unit on the support rod and the folding of the frame body. Users can fold the whole vehicle without bending over, so it is convenient to use.

[0028] 4. The backrest can be folded and rotated relative to the seat by means of the armrest extension and retraction control mechanism. When the backrest is rotated and unfolded to a preset angle relative to the seat, the armrest can be rotated and unfolded relative to the seat, which is convenient to use. Attached Figure Description

[0029] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a perspective view of the invention in its unfolded state.

[0031] Figure 2 This is a side view of the invention in its unfolded state.

[0032] Figure 3 This is a perspective view of the vehicle frame in the present invention in an unfolded state and the child seat in the folding process.

[0033] Figure 4 This is a perspective view of the main frame of the vehicle in the unfolded state in this invention.

[0034] Figure 5 This diagram shows the positional relationship between the support drive unit and the seat unlocking pin when the main body of the frame is in the unfolded state in this invention.

[0035] Figure 6 This is a perspective view of the present invention during the folding process.

[0036] Figure 7 This is a perspective view of the main body of the vehicle frame in the folding process of the present invention.

[0037] Figure 8 This diagram shows the positional relationship between the support drive unit and the seat unlocking pin of the main frame body during the folding process in this invention.

[0038] Figure 9 This is a perspective view of the present invention in its folded state.

[0039] Figure 10 This is a side view of the invention in its folded state.

[0040] Figure 11 This is a perspective view of the main frame of the vehicle in the folded state in this invention.

[0041] Figure 12 This diagram shows the positional relationship between the support drive unit and the seat unlocking pin when the main body of the frame is in the folded state in this invention.

[0042] Figure 13 This is one of the exploded views of the frame locking mechanism in this invention.

[0043] Figure 14This is the second exploded view of the frame locking mechanism in this invention.

[0044] Figure 15 This is one of the exploded views of the seat locking mechanism and the seat unlocking mechanism in this invention.

[0045] Figure 16 This is the second exploded view of the seat locking mechanism and seat unlocking mechanism in this invention.

[0046] Figure 17 This is a perspective view of the child seat in the unfolded state according to the present invention.

[0047] Figure 18 for Figure 17 A partial sectional view.

[0048] Figure 19 This is a side view of the backrest when it is flipped forward to a preset angle in this invention.

[0049] Figure 20 for Figure 19 A partial sectional view.

[0050] Figure 21 This is a side view of the backrest and armrests in the folded-down state in this invention.

[0051] Figure 22 for Figure 21 A partial sectional view.

[0052] Figure 23 This is one of the exploded views of the backrest locking mechanism in this invention.

[0053] Figure 24 This is the second exploded view of the backrest locking mechanism in this invention. Detailed Implementation

[0054] The following is in conjunction with the appendix Figure 1-24 The embodiments of the present invention will be described in detail.

[0055] like Figure 1-12As shown in Figures 15 and 16, the present invention provides a stroller frame, comprising: a frame body 1, a seat connection assembly 2, a seat locking mechanism 3, and a seat unlocking mechanism 4; the frame body 1 can be switched from an unfolded state to a folded state, and is connected to a child seat 5 with folding and unfolding functions via the seat connection assembly 2; the seat connection assembly 2 is rotatably connected to the frame body 1, and a seat locking mechanism 3 is provided between the seat connection assembly 2 and the frame body 1 for locking the seat connection assembly 2 relative to the frame body 1; the seat unlocking mechanism 4 is located between the frame body 1 and the seat connection assembly 2, and is configured to be able to be linked by the frame body 1 to release the seat locking mechanism 3 during the process of the frame body 1 changing from an unfolded state to a folded state, thereby releasing the locking state of the seat connection assembly 2 relative to the frame body 1.

[0056] This invention folds the child seat first before folding the entire vehicle. Then, the frame body is unlocked, and the frame body is rotated to fold. The frame body unlocks the seat locking mechanism through a linkage seat unlocking mechanism, thereby releasing the locking state of the seat connecting component relative to the frame body. This allows the child seat to rotate and fold relative to the frame body, thus completing the overall folding of the child vehicle frame. It features reliable unlocking and is easy to use.

[0057] In one embodiment of the present invention, the frame body 1 includes a front leg 11, a rear leg 12, and a handlebar 15. The upper ends of the front leg 11, the rear leg 12, and the handlebar 15 are rotatably connected via a frame joint assembly. The seat unlocking mechanism 4 is configured to release the seat locking mechanism 3 by linkage with the handlebar 15 during the transition from an unfolded state to a folded state. During folding, the locking state of the frame joint assembly is released, and then the handlebar 15 is rotated downward relative to the rear leg 12. The handlebar 15 then links the seat unlocking mechanism 4 to release the seat locking mechanism 3, thereby releasing the locking state of the seat connection assembly 2 relative to the frame body 1. In addition, a co-moving member is provided between the front leg 11 and the handlebar 15, which allows the front leg 11 and the handlebar 15 to rotate towards each other and away from each other simultaneously. For example, this co-moving member can be two meshing gears, which can improve the efficiency of folding and unfolding the frame body and reduce the number of operation steps.

[0058] In one embodiment of the present invention, the seat unlocking mechanism 4 includes a seat unlocking slider 41 slidably disposed on the rear foot bar 12 and capable of releasing the seat locking mechanism 3 in conjunction with it. The seat unlocking slider 41 and the rear foot bar 12 are respectively provided with seat unlocking inclined surfaces 411 for lateral sliding of the seat unlocking slider 41 when the seat unlocking slider 41 slides. The seat unlocking slider 41 is configured to release the seat locking mechanism 3 in conjunction with the handle bar 15 during the process of changing from the unfolded state to the folded state.

[0059] As a specific embodiment of the present invention, such as Figure 1-14 As shown, the frame body 1 includes a front leg 11, a rear leg 12, a connecting rod 13, a support rod 14, and a handlebar 15. The upper end of the front leg 11 is rotatably connected to the upper end of the rear leg 12; the lower end of the connecting rod 13 is rotatably connected to the upper end of the rear leg 12, and the upper end of the connecting rod 13 is rotatably connected to the middle of the handlebar 15; the lower end of the support rod 14 is rotatably connected to the upper part of the rear leg 12, and the upper end of the support rod 14 is rotatably connected to the lower end of the handlebar 15. The frame body 1 also includes a frame locking mechanism 16 for locking the frame body 1 in the unfolded state and a frame unlocking mechanism 17 for unlocking the frame locking mechanism 16. The seat unlocking mechanism 4 is configured to release the seat locking mechanism 3 by linkage with the support rod 14 during the process of changing the support rod 14 from the unfolded state to the folded state. In this embodiment, the rear leg bar, connecting rod, handlebar, and support rod form a four-bar linkage. When the frame body is in the unfolded state, the four-bar linkage is transformed into a three-bar linkage and locked, thereby improving the structural stability and reliability of the frame body. When folded, in order to make the front leg bar and connecting rod 13 move towards the rear leg bar, the front leg bar and connecting rod 13 can be linked together by means of linkages or gears.

[0060] The seat unlocking mechanism 4 includes a seat unlocking slider 41 that is slidably mounted on the rear foot bar 12 and can be released in conjunction with the seat locking mechanism 3. The seat unlocking slider 41 and the rear foot bar 12 are respectively provided with seat unlocking inclined surfaces 411 on opposite sides for the seat unlocking slider 41 to slide laterally when the seat unlocking slider 41 slides. The seat unlocking slider 41 is configured to be able to be released from the seat locking mechanism 3 by the support rod 14 when the handle bar 15 changes from the unfolded state to the folded state.

[0061] like Figure 1-12As shown in Figures 15 and 16, the front leg rod and connecting rod 13 are linked by a linkage. The frame body 1 also includes a front leg linkage mechanism 18 located between the front leg rod 11 and the support rod 14. The front leg linkage mechanism 18 is configured to be linked by the support rod 14 when the support rod 14 changes from an unfolded state to a folded state, thereby linking the front leg rod 11 to rotate and fold towards the rear leg rod 12. Specifically, the front leg linkage mechanism 18 includes a front linkage rod 181 and a rear linkage rod 182. The front end of the front linkage rod 181 is rotatably connected to the front leg rod 11, and the rear end of the front linkage rod 181 is rotatably connected to the front end of the rear linkage rod 182. The rear end of the rear linkage rod 182 is relatively fixedly connected to the lower end of the support rod 14. Preferably, the rear linkage rod 182 and the support rod 14 are integrally formed and J-shaped. In this embodiment, the front support rod 11, rear support rod 12, front linkage rod 181, and rear linkage rod 182 form a four-bar linkage mechanism, which is locked when the support rod is locked. The frame body 1 includes two four-bar linkage mechanisms, meaning that locking one of the four-bar linkage mechanisms will also lock the other four-bar linkage mechanism, converting both into a three-bar connection structure. This improves the structural stability and reliability of the frame body. In addition, through the linkage of the two four-bar linkage mechanisms, only one frame locking mechanism is needed, effectively simplifying the connection between the rods and resulting in a simple structure and minimal overall weight.

[0062] like Figure 13 , 14 As shown, the frame locking mechanism 16 includes frame locking grooves 161 respectively provided on opposite sides of the connecting rod 13 and the handlebar 15. A frame locking gear 162 is provided between the connecting ends of the connecting rod 13 and the handlebar 15, which can slide laterally and simultaneously engage with the frame locking grooves 161 on both the connecting rod 13 and the handlebar 15. A frame locking elastic element 163 is provided between the frame locking gear 162 and the corresponding end of the connecting rod 13, enabling the frame locking gear 162 to simultaneously engage with the frame locking grooves 161 on both the connecting rod 13 and the handlebar 15. The frame unlocking mechanism 17 includes a rotatable... A frame unlocking turntable 171 is disposed between the handlebar 15 and the frame locking gear 162 and can push the frame locking gear 162 out of the frame locking tooth groove 161 of the handlebar 15. On the opposite sides of the frame unlocking turntable 171 and the handlebar 15, there are respectively a frame unlocking inclined surface 1711 for sliding the frame unlocking turntable 171 laterally when the frame unlocking turntable 171 is rotated. The frame unlocking mechanism 17 also includes a frame unlocking operation component 173 disposed on the handlebar 15. The frame unlocking operation component 173 is connected to the frame unlocking turntable 171 through a frame unlocking pull rope 172.

[0063] When the frame needs to be folded, the user manually operates the frame unlocking mechanism 173. The mechanism 173 pulls the frame unlocking turntable 171 via the frame unlocking cable 172, causing it to rotate. Under the action of the frame unlocking ramp 1711, the turntable 171 pushes the frame locking gear 162 laterally, causing it to disengage from the frame locking groove 161 of the handlebar 15. This releases the locking state of the handlebar 15 relative to the connecting rod 13, and simultaneously releases the locking of the two four-bar linkages. Next, the handlebar 15 is folded forward relative to the connecting rod 13, while the connecting rod 13 folds backward. Simultaneously, the upper end of the support rod 14 rotates downward around its pivot with the rear footrest, correspondingly... Figure 6 , 7 As shown, the lower end of the support rod 14 tilts upwards, and when it rotates to a certain angle, the lower part of the support rod 14 is linked to the seat unlocking mechanism 4 to release the seat locking mechanism 3, thereby releasing the seat connecting assembly 2 from the locked state relative to the frame body 1. At the same time, the lower end of the support rod 14 also causes the front end of the rear linkage rod 182 to pull the rear end of the front linkage rod 181 upwards, causing the front footrest 11 to rotate and fold towards the rear footrest 12.

[0064] like Figure 15 , 16As shown, the lower part of the support rod 14 is provided with a support drive part 140 for linking the seat unlocking mechanism 4 when the support rod 14 changes from the unfolded state to the folded state; the seat locking mechanism 3 is located between the seat connecting assembly 2 and the rear foot rod 12; the seat unlocking mechanism 4 is located on the rear foot rod 12. The seat locking mechanism 3 includes seat locking grooves 31 respectively provided on opposite sides of the seat connecting assembly 2 and the rear leg bar 12. A seat locking gear 32 is provided between the seat connecting assembly 2 and the rear leg bar 12, which can slide laterally and simultaneously engage with the seat locking grooves 31 on the seat connecting assembly 2 and the rear leg bar 12. A seat locking elastic member 33 is provided between the seat locking gear 32 and the seat connecting assembly 2, which can make the seat locking gear 32 elastically engage with the seat locking grooves 31 on the seat connecting assembly 2 and the rear leg bar 12. The seat unlocking mechanism 4 includes a seat unlocking slider 41 slidably provided on the rear leg bar 12 and capable of pushing the seat locking gear 32 to slide laterally. A corresponding clearance elongated hole is provided on the seat unlocking slider 41. The pivot of the seat connecting assembly 2 passes through the clearance elongated hole on the seat unlocking slider 41 to ensure that the seat unlocking slider 41 can slide relative to the rear leg bar. On opposite sides of the seat unlock slider 41 and the rear foot bar 12, there are seat unlocking inclined surfaces 411 for forcing the seat unlock slider 41 to slide laterally when it slides; the seat unlock slider 41 is provided with a seat unlocking pin 412 directly or indirectly. Preferably, the seat unlocking pin 412 extends out of the inner surface of the rear foot bar and cooperates with the support drive part 140. The inner surface of the rear foot bar is provided with a corresponding clearance elongated hole for the seat unlocking pin 412 to slide. The support drive part 140 is a support drive arc surface provided on the lower part of the support rod 14, which facilitates the linkage of the seat unlocking mechanism and avoids interference and jamming between the support drive part 140 and the seat unlocking pin 412 of the seat unlocking mechanism, ensuring smooth linkage.

[0065] During the transition from the unfolded to the folded state of the vehicle frame, the support drive unit 140 pushes the seat unlocking pin 412 to slide, causing the seat unlocking slider 41 to slide upward relative to the rear footrest 12. Under the action of the seat unlocking ramp 411, the seat unlocking slider 41 pushes the seat locking gear 32 to slide laterally, ultimately causing the seat locking gear 32 to disengage from the seat locking groove 31 of the rear footrest 12. This releases the locking state of the seat connecting assembly 2 relative to the rear footrest 12. At this time, the child seat 5 connected to the seat connecting assembly 2 can rotate and fold relative to the vehicle frame under the influence of gravity. Figure 9 , 10 As shown.

[0066] like Figure 15 , 16As shown, in order to better link and unlock and avoid interference, a seat unlocking push rod 42 is slidably provided inside the rear foot rod 12 for pushing the seat unlocking slider 41 to slide, and the seat unlocking pin 412 is provided on the seat unlocking push rod 42.

[0067] like Figure 17-24 As shown, the child seat 5 includes a seat portion 51, a backrest 52, and an armrest portion 54 that are fixedly connected to the seat connection assembly 2. The lower end of the backrest 52 is rotatably connected to the seat portion 51. A backrest locking mechanism 53 for locking the backrest 52 relative to the seat portion 51 and a backrest unlocking mechanism 534 for unlocking the backrest locking mechanism 53 are provided between the backrest 52 and the seat portion 51. The armrest portion 54 is rotatably connected to the seat portion 51 and located in front of the backrest 52. An armrest retraction control mechanism 55 is provided between the armrest portion 54 and the backrest 52. The armrest retraction control mechanism 55 is configured to cause the backrest 52 to rotate and retract relative to the seat portion 51 when the backrest 52 rotates forward and folds to a preset angle relative to the seat portion 51, and to cause the backrest 52 to rotate and unfold relative to the seat portion 51 when the backrest 52 rotates backward and unfolds to a preset angle relative to the seat portion 51.

[0068] like Figure 23 , 24 As shown, the seat portion 51 includes a seat connecting seat 511, the backrest 52 includes a backrest connecting seat 521 for rotatably connecting to the seat connecting seat 511, and the backrest locking mechanism 53 is located between the seat connecting seat 511 and the backrest connecting seat 521.

[0069] like Figure 18 , 20 As shown in Figures 22-24, in order to coordinate the rotation of the armrest, the armrest 54 includes an armrest connecting seat 541 for rotatable connection with the seat connecting seat 511. The armrest extension and retraction control mechanism 55 is located between the backrest connecting seat 521 and the armrest connecting seat 541. The backrest connecting seat 521 and the seat connecting seat 511 are connected by a rotating shaft A located on the central axis of the seat connecting seat 511. The armrest connecting seat 541 and the seat connecting seat 511 are connected by a rotating shaft B. The rotating shaft B is eccentrically arranged relative to the central axis of the seat connecting seat 511.

[0070] like Figure 18 , 20 As shown in Figures 22-24, the armrest retraction control mechanism 55 includes an armrest retraction control groove 551 and an armrest retraction control pin 552. The armrest retraction control groove 551 is located on the armrest connecting seat 541, and the armrest retraction control pin 552 is located on the backrest connecting seat 521, with its driving end passing through the armrest retraction control groove 551. Figure 18As shown, the inner wall of the armrest extension control groove 551 is provided with an avoidance arc surface 5511 for avoiding the armrest extension control pin 552 when the armrest part 54 is in the extended state, so as to facilitate the adjustment of the tilt angle by rotating the backrest.

[0071] Furthermore, the handrail connecting seat 541 is provided with a handrail guide groove 5411 for the rotating shaft A to pass through and engage. The handrail guide groove 5411 communicates with the handrail retraction control groove 551, wherein there is an included angle between the handrail guide groove 5411 and the handrail retraction control groove 551. The handrail guide groove 5411 is an arc-shaped groove, and its center is located on the rotating shaft B. Figure 18 , 20 As shown, when the handrail is fully extended, the rotating shaft A abuts against the front end of the handrail guide groove 5411, at which time the handrail connecting seat 541 is restricted from continuing to rotate backward.

[0072] When the armrest is fully folded, as Figure 22 As shown, the rotating shaft A abuts against the rear end of the handrail guide groove 5411, at which point the handrail connecting seat 541 is restricted from continuing to fold forward.

[0073] like Figure 23 , 24 As shown, to better lock the backrest, the backrest locking mechanism 53 includes backrest locking grooves 531 respectively provided on opposite sides of the seat connecting seat 511 and the backrest connecting seat 521. A backrest locking gear 532 is laterally slidable between the seat connecting seat 511 and the backrest connecting seat 521, capable of simultaneously engaging the backrest locking grooves 551 of both the seat connecting seat 511 and the backrest connecting seat 521. A backrest locking elastic member 533 is provided between the backrest locking gear 532 and the seat connecting seat 511 to keep the backrest locking gear 532 elastically engaged in the backrest locking grooves 531 of both the seat connecting seat 511 and the backrest connecting seat 521. The backrest unlocking mechanism 53... 4 includes a backrest unlocking turntable 5341 rotatably disposed between the backrest locking gear 532 and the backrest connecting seat 521 and capable of pushing the backrest locking gear 532 out of the backrest locking groove 531 of the backrest connecting seat 521. The backrest unlocking turntable 5341 and the backrest connecting seat 521 are respectively provided with driving inclined surfaces 53411 for lateral sliding of the backrest unlocking turntable 5341 when the backrest unlocking turntable 5341 is rotated. The backrest unlocking mechanism 534 also includes a backrest unlocking operation member 5343 movably disposed on the backrest back 52. The backrest unlocking operation member 5343 is connected to the backrest unlocking turntable 5341 through a backrest unlocking pull rope 5342. When the backrest locking mechanism 53 is released from its locking state on the backrest, the backrest can rotate relative to the seat. When it rotates to a suitable angle, the backrest unlocking operation 5343 is released, which allows the backrest locking gear 532 to simultaneously engage with the backrest locking groove 531 of the seat connecting seat 511 and the backrest connecting seat 521, thereby locking the backrest and achieving the adjustment function.

[0074] The folding process of this invention is as follows: First, the user operates the backrest unlocking mechanism 5343 and pulls the backrest unlocking turntable 5341 to rotate via the backrest unlocking pull rope 5342. At this time, the backrest unlocking turntable 5341 slides laterally under the action of the driving inclined surface 53411, and the backrest locking gear 532 is pushed by the backrest unlocking turntable 5341 to slide towards the seat connecting seat 511, so that the backrest locking gear 532 exits the backrest locking groove 531 on the backrest connecting seat 521, thereby releasing the locking state of the backrest connecting seat 521 relative to the seat connecting seat 511.

[0075] Next, as Figure 3 As shown, the backrest 52 flips and folds forward relative to the seat 51. The backrest is connected to the armrest retraction control groove 551 via the armrest retraction control pin 552 to rotate and fold the armrest until the armrest 54 and the backrest 52 are both close to the seat 51.

[0076] Then, the user operates the frame unlocking mechanism 173, which pulls the frame unlocking turntable 171 to rotate via the frame unlocking cable 172. Under the action of the frame unlocking ramp 1711, the frame unlocking turntable 171 pushes the frame locking gear 162 to slide laterally, causing the frame locking gear 162 to disengage from the frame locking groove 161 of the handlebar 15, thereby releasing the locking state of the handlebar 15 relative to the connecting rod 13. Then, the handlebar 15 is flipped forward relative to the connecting rod 13, causing the handlebar 15 to drive the connecting rod 13 and the support rod 14 to rotate downwards. Figure 6 , 7 As shown, during the rotation and folding process of the support rod 14, the support drive unit 140 pushes the seat unlocking pin 412, causing the seat unlocking slider 41 to slide upward relative to the rear foot bar 12. Under the action of the seat unlocking inclined surface 411, the seat unlocking slider 41 pushes the seat locking gear 32 to slide laterally, thereby causing the seat locking gear 32 to disengage from the seat locking groove 31 of the rear foot bar 12, thus releasing the locking state of the seat part 51 of the seat connecting assembly 2 relative to the rear foot bar 12. At this time, the child seat 5 connected to the seat connecting assembly 2 can rotate and fold relative to the frame body, as shown. Figure 9 , 10 As shown; at the same time, the lower end of the support rod 14 causes the front end of the rear linkage rod 182 and the rear end of the front linkage rod 181 to move upward, while pulling the front foot rod 11 to the side of the rear foot rod 12 and folding it in.

[0077] Finally, as Figure 9 As shown, complete the overall folding of the stroller frame.

Claims

1. A stroller frame, characterized in that... include: The frame body (1) can be switched from an unfolded state to a folded state; Seat connection assembly (2), the seat connection assembly (2) is used to connect with a child seat (5) with folding and unfolding functions, the seat connection assembly (2) is rotatably connected to the frame body (1), and a seat locking mechanism (3) is provided between the seat connection assembly (2) and the frame body (1) for locking the seat connection assembly (2) relative to the frame body (1). The seat unlocking mechanism (4) is located between the frame body (1) and the seat connection assembly (2). The seat unlocking mechanism (4) is configured to be able to be linked by the frame body (1) to release the seat locking mechanism (3) when the frame body (1) changes from the unfolded state to the folded state, thereby releasing the locking state of the seat connection assembly (2) relative to the frame body (1). The frame body (1) includes a front leg (11), a rear leg (12), a connecting rod (13), a support rod (14) and a handlebar (15), the upper end of the front leg (11) and the upper end of the rear leg (12) being rotatably connected; The lower end of the connecting rod (13) is rotatably connected to the upper end of the rear foot rod (12), and the upper end of the connecting rod (13) is rotatably connected to the middle part of the handle (15). The lower end of the support rod (14) is rotatably connected to the upper part of the rear foot rod (12), and the upper end of the support rod (14) is rotatably connected to the lower end of the handle (15). The frame body (1) also includes a frame locking mechanism (16) for locking the frame body (1) in the unfolded state and a frame unlocking mechanism (17) for unlocking the frame locking mechanism (16). The seat unlocking mechanism (4) is configured to release the seat locking mechanism (3) by linkage with the support rod (14) during the process of the support rod (14) changing from the unfolded state to the folded state; The lower part of the support rod (14) is provided with a support drive part (140) for linking the seat unlocking mechanism (4) when the support rod (14) changes from the unfolded state to the folded state. The frame locking mechanism (16) is located between the connecting rod (13) and the handlebar (15), and the frame locking mechanism (16) is configured to lock the handlebar (15) relative to the connecting rod (13).

2. The stroller frame according to claim 1, characterized in that... The frame body (1) also includes a front foot linkage mechanism (18) located between the front foot rod (11) and the support rod (14). The front foot linkage mechanism (18) is configured to be linked by the support rod (14) when the support rod (14) changes from the unfolded state to the folded state, thereby linking the front foot rod (11) to rotate and fold towards the rear foot rod (12).

3. A stroller frame according to claim 2, characterized in that... The front foot linkage mechanism (18) includes a front linkage rod (181) and a rear linkage rod (182). The front end of the front linkage rod (181) is rotatably connected to the front foot rod (11), and the rear end of the front linkage rod (181) is rotatably connected to the front end of the rear linkage rod (182). The rear end of the rear linkage rod (182) is relatively fixedly connected to the lower end of the support rod (14).

4. A stroller frame according to claim 1, characterized in that... The frame locking mechanism (16) includes frame locking grooves (161) respectively provided on opposite sides of the connecting rod (13) and the handlebar (15). A frame locking gear (162) is provided between the connecting end of the connecting rod (13) and the handlebar (15) and can slide laterally and simultaneously engage with the frame locking grooves (161) on the connecting rod (13) and the handlebar (15). A frame locking elastic element (163) is provided between the corresponding end of the frame locking gear (162) and the connecting rod (13) and can simultaneously engage with the frame locking grooves (161) on the connecting rod (13) and the handlebar (15). The frame locking gear (162) is configured to be disengaged from the frame locking grooves (161) on the handlebar (15) by linkage with the frame unlocking mechanism (17).

5. A stroller frame according to claim 4, characterized in that... The frame unlocking mechanism (17) includes a frame unlocking turntable (171) rotatably disposed between the handlebar (15) and the frame locking gear (162) and capable of pushing the frame locking gear (162) out of the frame locking tooth groove (161) of the handlebar (15). The frame unlocking turntable (1711) and the handlebar (15) are respectively provided on opposite sides for sliding the frame unlocking turntable (171) laterally when the frame unlocking turntable (171) is rotated. The frame unlocking mechanism (17) also includes a frame unlocking operating component (173) disposed on the handlebar (15). The frame unlocking operating component (173) is connected to the frame unlocking turntable (171) through a frame unlocking pull rope (172).

6. A stroller frame according to any one of claims 1-5, characterized in that... The seat locking mechanism (3) is located between the seat connecting assembly (2) and the rear footrest (12); the seat unlocking mechanism (4) is located on the rear footrest (12).

7. A stroller frame according to claim 6, characterized in that... The seat locking mechanism (3) includes seat locking grooves (31) respectively provided on opposite sides of the seat connecting assembly (2) and the rear leg (12). A seat locking gear (32) is provided between the seat connecting assembly (2) and the rear leg (12) and can slide laterally and simultaneously engage with the seat locking grooves (31) on the seat connecting assembly (2) and the rear leg (12). A seat locking elastic element (33) is provided between the seat locking gear (32) and the seat connecting assembly (2) and can simultaneously engage with the seat locking grooves (31) on the seat connecting assembly (2) and the rear leg (12). The seat locking gear (32) is configured to be able to be released from the seat locking grooves (31) on the rear leg (12) by linkage with the seat unlocking mechanism (4).

8. A stroller frame according to claim 7, characterized in that... The seat unlocking mechanism (4) includes a seat unlocking slider (41) that is slidably mounted on the rear foot bar (12) and can push the seat locking gear (32) to slide laterally. The seat unlocking slider (41) and the rear foot bar (12) are respectively provided with seat unlocking inclined surfaces (411) for the seat unlocking slider (41) to slide laterally when the seat unlocking slider (41) slides. The seat unlocking slider (41) is directly or indirectly provided with a seat unlocking pin (412) for the lower part of the support rod (14) to push.

9. A stroller frame according to claim 8, characterized in that... The rear foot bar (12) is slidably provided with a seat unlocking push rod (42), and the seat unlocking pin (412) is relatively fixed on the seat unlocking push rod (42). When the lower part of the support rod (14) pushes the seat unlocking pin (412), the seat unlocking pin (412) pushes the seat unlocking push rod (42) to slide relative to the rear foot bar (12), and the seat unlocking push rod (42) then pushes the seat unlocking slider (41) to slide.

10. A stroller frame according to any one of claims 1-5, characterized in that... The child seat (5) includes a seat portion (51), a backrest (52), and an armrest portion (54) for connection with the seat connection assembly (2); the lower end of the backrest (52) is rotatably connected to the seat portion (51), and a backrest locking mechanism (53) for locking the backrest (52) relative to the seat portion (51) and a backrest unlocking mechanism (534) for unlocking the backrest locking mechanism (53) are provided between the backrest (52) and the seat portion (51); the armrest portion (54) is rotatably connected to the seat portion (51). 51) Located in front of the backrest (52), the armrest (54) and the backrest (52) are provided with an armrest retraction control mechanism (55). The armrest retraction control mechanism (55) is configured to cause the backrest (52) to rotate and retract relative to the seat (51) when the backrest (52) rotates forward and folds to a preset angle, and to cause the backrest to rotate and retract relative to the seat (51) when the backrest (52) rotates backward and unfolds relative to the seat (51) to unfold relative to the seat.

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