Seat assembly and stroller

Abstract

A seat plate is connected with a backrest capable of being rotationally folded relative to the seat plate, the backrest comprises a lower backup plate rotationally connected with the seat plate, and the lower backup plate is connected with an upper backup plate which can be rotationally folded relative to the seat plate together with the lower backup plate and can be separated from the lower backup plate. A first locking mechanism used for locking the upper backup plate and the lower backup plate when the upper backup plate and the lower backup plate are connected is arranged between the upper backup plate and the lower backup plate, a first unlocking piece capable of driving the first locking mechanism to unlock is arranged on the upper backup plate, and a second locking mechanism used for locking the lower backup plate and the seat plate when the lower backup plate and the seat plate are in a relatively unfolded state is arranged between the lower backup plate and the seat plate. The lower backup plate is provided with a second unlocking piece capable of driving the second locking mechanism to unlock, and the upper backup plate is further provided with an operation piece capable of driving the second unlocking piece to unlock the second locking mechanism when the upper backup plate is connected with the lower backup plate. The seat assembly and the stroller adopting the seat assembly are simple in structure, suitable for being used by children with small heights and children with large heights, and capable of being folded and stored.

Description

Technical Field

[0001] The utility model relates to a seat assembly. The utility model also relates to a baby carriage.

Background Art

[0002] Baby carriages are common products in the process of children's growth. Currently, a general baby carriage generally includes a frame and a seat assembly arranged on the frame, and the seat assembly includes a seat board and a backrest. However, the height of the backrest of the current baby carriage is generally fixed. If the backrest is relatively short, it is not suitable for children with a relatively small height to ride, because the relatively short backrest cannot provide sufficient protection for children; if the backrest is relatively high, it is not suitable for children with a relatively large height to ride. Although the relatively high backrest provides better protection for children, the relatively high backrest will limit the activity space of children and also reduce the breathability of the children's backs. Therefore, more and more users hope that a seat assembly and a baby carriage that can be suitable for both children with a relatively small height and children with a relatively large height will appear. Therefore, the present utility model comes into being.

Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a seat assembly with a simple structure that can be suitable for both children with a relatively small height and children with a relatively large height, and the seat assembly can also be folded and stored.

[0004] The utility model also provides a baby carriage with a simple structure that can be suitable for both children with a relatively small height and children with a relatively large height, and the baby carriage can also be folded and stored, which is convenient to carry or store.

[0005] The present utility model is realized through the following technical solutions:

[0006] A seat assembly includes a seat board 11, and a backrest 12 that can be rotationally folded relative to the seat board 11 is connected to the seat board 11. The backrest 12 includes a lower backrest plate 121 that is rotatably connected to the seat board 11. An upper backrest plate 122 that can rotate and fold relative to the seat board 11 together with the lower backrest plate 121 and can be detachably separated from the lower backrest plate 121 is connected to the lower backrest plate 121. A first locking mechanism 13 for locking the two when they are connected is provided between the upper backrest plate 122 and the lower backrest plate 121. A first unlocking member 14 capable of driving the first locking mechanism 13 to unlock is provided on the upper backrest plate 122. A second locking mechanism 15 for locking the two in a relatively unfolded state is provided between the lower backrest plate 121 and the seat board 11. A second unlocking member 16 capable of driving the second locking mechanism 15 to unlock is provided on the lower backrest plate 121. An operating member 17 that can drive the second unlocking member 16 to unlock the second locking mechanism 15 when the upper backrest plate 122 is connected to the lower backrest plate 121 is also provided on the upper backrest plate 122.

[0007] The upper support plate 122 includes an upper front shell 1221 and an upper rear shell 1222 connected thereto, the upper front shell 1221 and the upper rear shell 1222 have a socket 123 at the lower end thereof which is sleeved on the upper part of the lower support plate 121, the first locking mechanism 13 includes a locking groove 131 provided in the lower support plate 121, a locking block 132 extending into the lower support plate 121 is provided in the upper support plate 122, the locking block 132 is provided with a locking hook 133 which can engage with or disengage from the locking groove 131 when it moves laterally relative to the upper support plate 122 and the lower support plate 121, the first unlocking member 14 includes a toggle block 141 which is exposed on the upper rear shell 122 and connected to the locking block 132 so as to drive the locking block 132 to move laterally, and a first reset spring 134 which can push the toggle block 141 to reset is provided between the toggle block 141 and the upper support plate 122.

[0008] The second locking mechanism 15 includes a locking seat 151 arranged on the seat plate 11, and a snap-in groove 152 is provided on the locking seat 151. A sliding seat 153 capable of sliding therein is provided in the lower support plate 121, and a locking pin 154 is provided on the sliding seat 153 which can engage with or disengage from the snap-in groove 152 when the sliding seat 153 slides relative to the lower support plate 121. The second unlocking member 16 includes a sliding seat 161 arranged in the lower support plate 121 and capable of sliding relative to the lower support plate 121. A pull rope 162 is provided between the sliding seat 161 and the sliding seat 153, which can pull the sliding seat 153 to slide when the sliding seat 161 slides. The sliding seat 161 is also provided with a handle 163 exposed to the lower support plate 121, and a second reset spring 155 which can push the sliding seat 153 to reset is also provided between the lower support plate 121 and the sliding seat 153.

[0009] The slide seat 161 is provided with a slide groove 164, and a slide pin 165 is provided in the slide groove 164, which can slide therein and can be exposed to the slide seat 161. A third return spring 166 is provided between the slide pin 165 and the bottom of the slide groove 164, which can push the slide pin 165 to return to its original position. The operating member 17 includes a linkage rod 171 provided in the upper support plate 122, and a hook portion 172 is provided at the lower end of the linkage rod 171. When the upper support plate 122 is connected to the lower support plate 121, the hook portion 172 is 72 hooks the sliding pin 165 exposed on the sliding seat 161 so that the linkage rod 171 is connected to the sliding seat 161, and the upper rear shell 1222 is provided with an exposed operating block 173 fixedly connected to the linkage rod 171, and a fourth reset spring 174 that can push the operating block 173 to reset is provided between the operating block 173 and the upper rear shell 1222, and the upper rear shell 1222 is also provided with a pushing rod 142 that can be inserted into the lower support plate 121 and can push the sliding pin 165 to disengage from the hook portion 172.

[0010] The pushing rod 142 is fixedly connected to the toggle block 141 .

[0011] A first inclined surface 165a is provided on the upper side of the sliding pin 165, and a second inclined surface 172a capable of pushing against the first inclined surface 165a when the upper backing plate 122 is connected to the lower backing plate 121 is provided on the lower side of the hook portion 172.

[0012] A front stop bar 18 that can rotate relative to the seat plate 11 and can be detachably separated is provided on the front side of the seat plate 11. The upper end of the front stop bar 18 is rotatably connected to a U-shaped frame 19 extending rearward. The rear end of the U-shaped frame 19 is rotatably connected to the upper backing plate 122 and can be detachably separated from the upper backing plate 122.

[0013] A detachable headrest pad 10 is further provided at the upper end of the upper backing plate 122.

[0014] A baby stroller includes a foldable frame 2, and the seat assembly as described above is provided on the frame 2.

[0015] The frame 2 includes a bottom support frame 21. Front wheels 21a and rear wheels 21b are provided on the bottom support frame 21. A protruding connecting seat 22 is provided at the rear side of the bottom support frame 21. A front support rod 23 is rotatably connected to the connecting seat 22 around a first axis A. A protruding connecting portion 24 is provided in the middle of the front support rod 23. A support rod 25 intersecting with the front support rod 23 is rotatably connected to the connecting portion 24 around a second axis B. A lower connecting rod 26 hinged to both of them is provided between the lower end of the support rod 25 and the bottom support frame 21. One end of the lower connecting rod 26 is rotatably connected to the support rod 25 around a third axis C, and the other end of the lower connecting rod 26 is rotatably connected to the bottom support frame 21 around a fourth axis D. A seat support member 27 is further provided between the upper end of the support rod 25 and the upper end of the front support rod 23. The seat plate 11 is connected to the seat support member 27. The seat support member 27 includes a support seat 271 rotatably connected to the support rod 25 around a fifth axis E at the rear side. An upper connecting rod 272 hinged to both of them is provided between the front side of the support seat 271 and the upper end of the front support rod 23. One end of the upper connecting rod 272 is rotatably connected to the support seat 271 around a sixth axis F, and the other end of the upper connecting rod 272 is rotatably connected to the front support rod 23 around a seventh axis G. A hand push rod 28 capable of sliding relative to it is further connected to the upper end of the support rod 25.

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

[0017] 1. The upper backrest of the present utility model is detachably connected to the lower backrest. When the upper backrest and the lower backrest are connected, the first locking mechanism locks the two. When the upper backrest and the lower backrest are connected, the seat assembly has a relatively high backrest in the downward height direction, which can provide sufficient support and protection for children with a relatively small height when they ride, ensuring safety. After the first unlocking member unlocks the first locking mechanism, the upper backrest can be detached from the lower backrest. At this time, the backrest of the seat assembly becomes shorter in the height direction, which can provide sufficient activity space for children with a relatively large height when they ride, making the back of the child more breathable and the ride more comfortable. More importantly, when the upper backrest and the lower backrest are connected, the operating member on the upper backrest can be connected to the second unlocking member, thereby driving the unlocking of the second locking mechanism between the lower backrest and the seat board, so that the upper backrest and the lower backrest can rotate and fold relative to the seat board together. When the upper backrest and the lower backrest are separated, the second unlocking member can be operated alone to unlock the second locking mechanism, so that the lower backrest can rotate and fold relative to the seat board. That is, regardless of whether the upper backrest is connected to the lower backrest or not, the second locking mechanism can be conveniently unlocked, making the folding operation of the seat assembly convenient and fast. The child stroller of the present utility model adopts the seat assembly with the foregoing structure, making the structure of the child stroller simple, which can be suitable for both children with a relatively small height and children with a relatively large height, and can also be folded and stored, facilitating users to carry or store.

[0018] 2. The upper backrest of the present utility model includes an upper front shell and an upper rear shell. The lower ends of the upper front shell and the upper rear shell have sockets sleeved on the upper part of the lower backrest. Therefore, the lower part of the upper backrest is sleeved on the upper part of the lower backrest, making the connection firm when the two are connected and having a strong bearing capacity for the back of the child.

Description of the Drawings

[0019] Figure 1 is one of the perspective views of the seat assembly of the present utility model;

[0020] Figure 2 is another perspective view of the seat assembly of the present utility model;

[0021] Figure 3 is one of the exploded views of the seat assembly of the present utility model;

[0022] Figure 4 is another exploded view of the seat assembly of the present utility model;

[0023] Figure 5 is Figure 4 the enlarged view at X in

[0024] Figure 6 is one of the exploded views of the seat assembly of the present utility model;

[0025] Figure 7 is another exploded view of the seat assembly of the present utility model;

[0026] Figure 8 is Figure 7 an enlarged view of Y in

[0027] Figure 9 a cross-sectional view of the seat assembly of the present utility model;

[0028] Figure 10 is Figure 9 an enlarged view of Z in

[0029] Figure 11 an exploded view of the components of the seat assembly of the present utility model;

[0030] Figure 12 a partial schematic view of the seat assembly of the present utility model;

[0031] Figure 13 is a three-dimensional view of the baby stroller of the present utility model;

[0032] Figure 14 is a side view of the baby stroller of the present utility model in the unfolded state;

[0033] Figure 15 is a side view of the baby stroller of the present utility model during the folding process;

[0034] Figure 16 is a three-dimensional view of the baby stroller of the present utility model with the upper backrest removed.

DETAILED IMPLEMENTATION MANNER

[0035] The present utility model will be further described below with reference to the accompanying drawings:

[0036] As Figures 1 to 10 and Figure 16As shown in the figure, a seat assembly includes a seat board 11, and a backrest 12 that is rotatably and foldably connected to the seat board 11. The backrest 12 includes a lower backrest plate 121 that is rotatably connected to the seat board 11. An upper backrest plate 122 that is rotatably and foldably connected to the seat board 11 together with the lower backrest plate 121 and is detachably separable from the lower backrest plate 121 is connected to the lower backrest plate 121. A first locking mechanism 13 for locking the two when they are connected is provided between the upper backrest plate 122 and the lower backrest plate 121. A first unlocking member 14 capable of driving the first locking mechanism 13 to unlock is provided on the upper backrest plate 122. A second locking mechanism 15 for locking the lower backrest plate 121 and the seat board 11 when they are in a relatively unfolded state is provided between the lower backrest plate 121 and the seat board 11. A second unlocking member 16 capable of driving the second locking mechanism 15 to unlock is provided on the lower backrest plate 121. An operating member 17 that can drive the second unlocking member 16 to unlock the second locking mechanism 15 when the upper backrest plate 122 is connected to the lower backrest plate 121 is further provided on the upper backrest plate 122. When the upper backrest plate 122 is connected to the lower backrest plate 121, the backrest 12 of the seat assembly is relatively high. For children with a relatively small height, the entire back of the child can be supported, ensuring the safety of the child. When the first locking mechanism 13 is unlocked through the first unlocking member 14, the upper backrest plate 122 can be removed from the lower backrest plate 121. At this time, the height of the backrest of the seat assembly becomes shorter. At this time, children with a relatively large height can be seated. The self-balancing ability and protection ability of such children are stronger. Even if the backrest 12 is relatively short, they can still be seated safely. Therefore, the relatively short backrest 12 does not limit the activity space of the child, and also makes the back of the child more breathable and comfortable to sit on. Moreover, the lower backrest 121 is rotatably connected to the seat board 11 and can be locked through the second locking mechanism 15. When the upper backrest plate 122 is connected to the lower backrest 121 and the backrest 12 needs to be folded, the operating member 17 on the upper backrest plate 122 is actuated, and the operating member 17 drives the second unlocking member 16 on the lower backrest plate 121 to actuate, thereby unlocking the second locking mechanism 15. When the upper backrest 122 is not connected to the lower backrest plate 121, the second unlocking member 16 can be directly operated to unlock the second locking mechanism 15. Therefore, regardless of whether the upper backrest plate 122 is connected to the lower backrest plate 121, the second locking mechanism 15 can be conveniently unlocked, making the folding operation of the backrest 12 convenient and fast.

[0037] As Figures 1 to 4 , Figure 9 and Figure 10 shown, the upper backrest plate 122 includes an upper front shell 1221 and an upper rear shell 1222 connected thereto. The lower ends of the upper front shell 1221 and the upper rear shell 1222 have a socket 123 sleeved on the upper part of the lower backrest plate 121. Therefore, the lower part of the upper backrest plate 122 is sleeved on the upper part of the lower backrest plate 121, making the connection firm when the two are connected and having a strong bearing capacity for the back of the child. Moreover, the second unlocking member 16 can be hidden inside the upper backrest plate 122, making the structure of the seat assembly simple and compact.

[0038] As Figures 3 to 7 , Figure 10 shown, the first locking mechanism 13 includes a locking groove 131 provided in the lower backrest plate 121. A locking block 132 extending into the lower backrest plate 121 is provided in the upper backrest plate 122. A locking hook 133 capable of engaging or disengaging with the locking groove 131 when the locking block 132 moves laterally relative to the upper backrest plate 122 and the lower backrest plate 121 is provided on the locking block 132. The first unlocking member 14 includes a toggle block 141 externally provided on the upper rear housing 1222 and connected to the locking block 132 to drive the locking block 132 to move laterally. A first return spring 134 capable of pushing it back to its original position is provided between the toggle block 141 and the upper backrest plate 122. When the upper backrest plate 122 is sleeved on the lower backrest plate 121, the locking hook 133 hooks the groove wall of the locking groove 131, so that the upper backrest plate 122 cannot be pulled out upward. After the toggle block 141 is pushed laterally to move, the locking block 132 moves laterally, and the locking hook 133 disengages from the locking groove 131. At this time, the upper backrest plate 122 can be pulled out upward. Of course, in order to prevent unlocking caused by misoperation, a two-stage lock structure can also be provided. The two-stage lock structure includes a pressing block 141a externally provided on the upper backrest plate 122 and capable of sliding relative to the toggle block 141. A convex block 141b is provided on the pressing block 141a. A blocking wall 122a capable of blocking the convex block 141b is provided on the upper rear housing 1222. A relief notch 122b capable of making way for the convex block 141b and enabling the pressing block 141a and the toggle block 141 to move laterally after the pressing block 141a is pressed is also provided on the upper rear housing 1222. A return element 141c capable of pushing the pressing block 141a back to its original position is further provided in the upper backrest plate 122. Therefore, when it is necessary to disengage the locking hook 133 from the locking groove 131, the pressing block 141a is first pressed, and the convex block 141b is no longer blocked by the blocking wall 122a, so that the pressing block 141a and the toggle block 141 can move laterally to push the locking block 132, thereby driving the locking hook 133 to disengage from the locking groove 131.

[0039] As Figures 3 to 8As shown, the second locking mechanism 15 includes a locking seat 151 provided on the seat plate 11. A clamping groove 152 is provided on the locking seat 151. A sliding seat 153 capable of sliding therein is provided in the lower backrest plate 121. A locking pin 154 is provided on the sliding seat 153, which can be engaged with or disengaged from the clamping groove 152 when the sliding seat 153 slides relative to the lower backrest plate 121. The second unlocking member 16 includes a sliding seat 161 provided in the lower backrest plate 121 and capable of sliding relative to the lower backrest plate 121. A pull rope 162 capable of pulling the sliding seat 153 to slide when the sliding seat 161 slides is provided between the sliding seat 161 and the sliding seat 153. A handle 163 exposed outside the lower backrest plate 121 is further provided on the sliding seat 161. A second return spring 155 capable of pushing the sliding seat 153 to reset is further provided between the lower backrest plate 121 and the sliding seat 153. When the locking pin 154 on the sliding seat 153 is stuck in the clamping groove 152, the lower backrest plate 121 and the seat plate 11 are locked and cannot rotate relative to each other. When the upper backrest plate 122 is not connected to the lower backrest plate 121 and the handle 163 is operated, the sliding seat 161 slides, and during the sliding process, the sliding seat 153 is pulled to slide through the pull rope 162, so that the locking pin 154 is disengaged from the clamping groove 152. At this time, the second locking mechanism 15 is unlocked, and the lower backrest plate 121 can rotate and fold relative to the seat plate 11. When the upper backrest plate 122 is connected to the lower backrest plate 121, the sliding seat 161 is driven to slide through the operating member 17 connected to the sliding seat 161 on the upper backrest plate 122, so that the locking pin 154 is disengaged from the clamping groove 152. In this embodiment, a plurality of clamping grooves 152 are provided along the circumferential direction. The locking pin 154 engaging with different clamping grooves 152 can make the backrest 12 stay at different angular positions relative to the seat plate 11, so as to make the child sit comfortably.

[0040] As Figures 3 to 10As shown, the slide seat 161 is provided with a slide groove 164, and the slide groove 164 is provided with a slide pin 165 that can slide therein and can be exposed on the slide seat 161. A third return spring 166 that can push the slide pin 165 to return to its original position is provided between the slide pin 165 and the bottom of the slide groove 164. The operating member 17 includes a linkage rod 171 provided in the upper support plate 122, and a hook portion 172 is provided at the lower end of the linkage rod 171. When the upper support plate 122 is connected to the lower support plate 121, the hook portion 172 hooks the slide pin 165 exposed on the slide seat 161. The sliding pin 165 of the seat 161 makes the linkage rod 171 connected to the sliding seat 161, the upper rear shell 1222 is provided with an exposed operating block 173 fixedly connected to the linkage rod 171, and a fourth reset spring 174 that can push the operating block 173 to reset is provided between the operating block 173 and the upper rear shell 1222. The upper rear shell 1222 is also provided with a push rod 142 that can be inserted into the lower support plate 121 and can push the sliding pin 165 to disengage from the hook portion 172, and the push rod 142 is fixedly connected to the toggle block 141. When the upper back plate 122 is connected to the lower back plate 121, the third return spring 166 pushes the sliding pin 165 outward. At this time, the sliding pin 165 is exposed on the sliding seat 161, and the hook portion 172 on the linkage rod 171 hooks the sliding pin 165. When the operating block 173 is made to slide relative to the upper back plate 122, the linkage rod 171 is caused to slide, and the hook portion 172 applies a force to the sliding pin 165, thereby causing the sliding seat 161 to slide with the linkage rod 171. During the sliding process, the sliding seat 161 drives the locking pin 154 to disengage from the clamping groove 152 through the pull rope 162, so that the second locking mechanism 15 is unlocked, and the upper back plate 122 and the lower back plate 121 can be rotated and folded relative to the seat plate 11. Moreover, when the hook portion 172 hooks the sliding pin 165, it also plays a role in locking the upper support plate 122 and the lower support plate 121 together. At this time, the locking action of the first locking mechanism 13 is cooperated to make the upper support plate 122 and the lower support plate 121 firmly connected. When it is necessary to disassemble the upper support plate 122, the toggle block 141 is pushed horizontally, and the locking hook 132 is disengaged from the locking groove 131. During the sliding process of the toggle block 141, the push rod 142 also slides horizontally relative to the upper support plate 122, and the push rod 142 pushes the sliding pin 165 to retract into the sliding groove 164. At this time, the hook portion 172 on the linkage rod 171 no longer hooks the sliding pin 165, and the upper support plate 122 can be directly pulled upwards to separate the upper support plate 122 from the lower support plate 121. In the process of pushing the toggle block 141 , the locking hook 132 and the locking groove 131 as well as the hook portion 172 and the sliding pin 165 can be unlocked and disengaged, so that the upper support plate 122 and the lower support plate 121 can be disassembled conveniently and quickly.

[0041] like Figure 10As shown, the upper side of the sliding pin 165 is provided with a first inclined surface 165a, and the lower side of the hook portion 172 is provided with a second inclined surface 172a that can push the first inclined surface 165a when the upper support plate 122 is connected to the lower support plate 121. When the upper support plate 122 is sleeved on the lower support plate 121, the second inclined surface 172a pushes the first inclined surface 165a, thereby pushing the sliding pin 165 to retract into the slide groove 164. Once the upper support plate 122 reaches the set position, the third return spring 166 pops out the sliding pin 165, and the hook portion 172 hooks the sliding pin 165 again, so that the operating member 17 can drive the second unlocking member 16 to move, and the connection between the upper support plate 122 and the lower support plate 121 is also firmly established.

[0042] like Figure 1 As shown, in order to ensure safety and have a better protective effect, the front side of the seat plate 11 is provided with a front bar 18 which can rotate relative to it and can be detached. The upper end of the front bar 18 is rotatably connected to a U-shaped frame 19 extending backward. The rear end of the U-shaped frame 19 is rotatably connected to an upper backing plate 122 and can be detached from the upper backing plate 122. Therefore, when a smaller child is riding, the front bar 18 and the U-shaped frame 19 can surround the child to further ensure safety. When a larger child is riding, the front bar 18, the U-shaped frame 19 and the upper backing plate 122 can be detached.

[0043] like Figure 1 As shown, a detachable headrest pad 10 is also provided at the upper end of the upper backrest plate 122 .

[0044] like Figures 14 to 16As shown, a child stroller comprises a foldable frame 2, on which the seat assembly as described above is provided, and the frame 2 comprises a bottom support frame 21, on which a front wheel 21a and a rear wheel 21b are provided, and a protruding connecting seat 22 is provided at the rear side of the bottom support frame 21, and a front support rod 23 is rotatably connected to the connecting seat 22 around a first axis A, and a protruding connecting portion 24 is provided at the middle part of the front support rod 23, and a support rod 25 crossing the front support rod 23 is rotatably connected to the connecting portion 24 around a second axis B, and a lower connecting rod 26 is provided between the lower end of the support rod 25 and the bottom support frame 21 and hinged to the two, and one end of the lower connecting rod 26 is rotatably connected to the support rod 25 around a third axis C The other end of the lower connecting rod 26 is rotatably connected to the bottom support frame 21 around the fourth axis D, and a seat support 27 is also provided between the upper end of the support rod 25 and the upper end of the front support rod 23. The seat plate 11 is connected to the seat support 27, and the seat support 27 includes a support seat 271 rotatably connected to the support rod 25 around the fifth axis E at the rear side, and an upper connecting rod 272 is provided between the front side of the support seat 271 and the upper end of the front support rod 23 and hinged to the two. One end of the upper connecting rod 272 is rotatably connected to the support seat 271 around the sixth axis F, and the other end of the upper connecting rod 272 is rotatably connected to the front support rod 23 around the seventh axis G. The upper end of the support rod 25 is also connected to a hand push rod 28 that can slide relative to it. When the child stroller is folded, the seat assembly is folded first, and then the push rod 28 is slid into the support rod 25 and a force is applied forward, at which time the support rod 25 and the front support rod 23 rotate relative to each other, the upper connecting rod 272 rotates relative to the support seat 271 and the front support rod 23, the lower connecting rod 26 rotates relative to the support rod 25 and the bottom support frame 21, and the support seat 271 also rotates relative to the support rod 21, so that the seat support 27, the front support rod 23 and the support rod 25 are all close to the bottom support frame 21, and the child stroller is folded. The entire child stroller has a simple structure, is flexible to fold, is easy to carry or store, and its seat assembly is suitable for both small and large children.

[0045] The embodiment is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiment, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the present purpose.

Claims

1. A seat assembly, characterized in that: The invention comprises a seat plate (11), the seat plate (11) is connected to a backrest (12) which can be rotated and folded relative to the seat plate (11), the backrest (12) comprises a lower backrest (121) which is rotatably connected to the seat plate (11), the lower backrest (121) is connected to an upper backrest (122) which can be rotated and folded relative to the seat plate (11) and can be detachably separated from the lower backrest (121), a first locking mechanism (13) is provided between the upper backrest (122) and the lower backrest (121) for locking the two when the two are connected, and the upper backrest (121) is connected to the lower backrest (121). 2) is provided with a first unlocking member (14) capable of driving the first locking mechanism (13) to unlock, a second locking mechanism (15) is provided between the lower back plate (121) and the seat plate (11) for locking the two when the two are in a relatively unfolded state, the lower back plate (121) is provided with a second unlocking member (16) capable of driving the second locking mechanism (15) to unlock, and the upper back plate (122) is also provided with an operating member (17) capable of driving the second unlocking member (16) to unlock the second locking mechanism (15) when the upper back plate (122) is connected to the lower back plate (121).

2. The seat assembly according to claim 1, characterized in that: The upper support plate (122) comprises an upper front shell (1221) and an upper rear shell (1222) connected thereto, the lower ends of the upper front shell (1221) and the upper rear shell (1222) have a socket (123) sleeved on the upper part of the lower support plate (121), the first locking mechanism (13) comprises a locking groove (131) arranged in the lower support plate (121), the upper support plate (122) is provided with a locking block (132) extending into the lower support plate (121), the locking block (132) A locking hook (133) is provided on the upper back plate (122) and can be engaged with or disengaged from the locking groove (131) when it moves laterally relative to the upper back plate (122) and the lower back plate (121), and the first unlocking member (14) includes a toggle block (141) which is exposed on the upper rear shell (1222) and connected to the locking block (132) and can drive the locking block (132) to move laterally, and a first return spring (134) is provided between the toggle block (141) and the upper back plate (122) to push it to return to its original position.

3. The seat assembly according to claim 2, characterized in that: The second locking mechanism (15) comprises a locking seat (151) arranged on the seat plate (11), the locking seat (151) is provided with a snap-in groove (152), the lower support plate (121) is provided with a sliding seat (153) which can slide therein, the sliding seat (153) is provided with a locking pin (154) which can engage with or disengage from the snap-in groove (152) when the sliding seat (153) slides relative to the lower support plate (121), and the second unlocking member (16) comprises a locking pin (154) which is arranged in the lower support plate (121) and A sliding seat (161) is capable of sliding relative to a lower support plate (121); a pull rope (162) is provided between the sliding seat (161) and the sliding seat (153) and can pull the sliding seat (153) to slide when the sliding seat (161) slides; a handle (163) is also provided on the sliding seat (161) and is exposed from the lower support plate (121); and a second return spring (155) is also provided between the lower support plate (121) and the sliding seat (153) and can push the sliding seat (153) to return to its original position.

4. The seat assembly according to claim 3, characterized in that: The sliding seat (161) is provided with a sliding groove (164), and a sliding pin (165) is provided in the sliding groove (164) which can slide therein and can be exposed from the sliding seat (161). A third return spring (166) is provided between the sliding pin (165) and the bottom of the sliding groove (164) to push the sliding pin (165) to return to its original position. The operating member (17) includes a linkage rod (171) provided in the upper support plate (122), and a hook portion (172) is provided at the lower end of the linkage rod (171). When the upper support plate (122) is connected to the lower support plate (121), the hook portion (172) is The upper rear shell (1222) hooks the sliding pin (165) exposed on the sliding seat (161) so that the linkage rod (171) is connected to the sliding seat (161); the upper rear shell (1222) is provided with an operating block (173) exposed and fixedly connected to the linkage rod (171); a fourth reset spring (174) capable of pushing the operating block (173) to reset is provided between the operating block (173) and the upper rear shell (1222); the upper rear shell (1222) is also provided with a pushing rod (142) capable of being inserted into the lower support plate (121) and capable of pushing the sliding pin (165) to disengage from the hook portion (172).

5. The seat assembly according to claim 4, characterized in that: The pushing rod (142) is fixedly connected to the toggle block (141).

6. The seat assembly according to claim 4, characterized in that: The upper side of the sliding pin (165) is provided with a first inclined surface (165a), and the lower side of the hook portion (172) is provided with a second inclined surface (172a) capable of pushing the first inclined surface (165a) when the upper support plate (122) is connected to the lower support plate (121).

7. The seat assembly according to claim 1, characterized in that: The front side of the seat plate (11) is provided with a front stopper (18) which is rotatable relative to the seat plate and can be detached. The upper end of the front stopper (18) is rotatably connected to a U-shaped frame (19) extending backward. The rear end of the U-shaped frame (19) is rotatably connected to an upper support plate (122) and can be detached from the upper support plate (122).

8. The seat assembly according to claim 1, characterized in that: The upper end of the upper backrest plate (122) is also provided with a detachable headrest pad (10).

9. A baby stroller, characterized in that: The invention comprises a foldable frame (2), on which a seat assembly as claimed in any one of claims 1 to 8 is arranged.

10. The baby stroller according to claim 9, characterized in that: The frame (2) comprises a bottom support frame (21), the bottom support frame (21) is provided with a front wheel (21a) and a rear wheel (21b), the bottom support frame (21) is provided with a protruding connecting seat (22) at the rear side, the connecting seat (22) is rotatably connected to a front support rod (23) around a first axis (A), a protruding connecting portion (24) is provided in the middle of the front support rod (23), a support rod (25) intersecting the front support rod (23) is rotatably connected to the connecting portion (24) around a second axis (B), a lower connecting rod (26) hingedly connected to the bottom support frame (21) is provided between the lower end of the support rod (25) and the bottom support frame (21), one end of the lower connecting rod (26) is rotatably connected to the support rod (25) around a third axis (C), and the other end of the lower connecting rod (26) is connected to the bottom support frame (21). ) is rotatably connected around a fourth axis (D), a seat support (27) is also provided between the upper end of the support rod (25) and the upper end of the front support rod (23), the seat plate (11) is connected to the seat support (27), the seat support (27) includes a support seat (271) whose rear side is rotatably connected to the support rod (25) around a fifth axis (E), an upper connecting rod (272) is provided between the front side of the support seat (271) and the upper end of the front support rod (23) and is hinged to the two, one end of the upper connecting rod (272) is rotatably connected to the support seat (271) around a sixth axis (F), and the other end of the upper connecting rod (272) is rotatably connected to the front support rod (23) around a seventh axis (G), and the upper end of the support rod (25) is also connected to a hand push rod (28) that can slide relative to it.

Images