CN112998478B - Baby seat with rotary backrest height adjustment function - Google Patents
Baby seat with rotary backrest height adjustment function Download PDFInfo
- Publication number
- CN112998478B CN112998478B CN202110341674.8A CN202110341674A CN112998478B CN 112998478 B CN112998478 B CN 112998478B CN 202110341674 A CN202110341674 A CN 202110341674A CN 112998478 B CN112998478 B CN 112998478B
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- Prior art keywords
- backrest
- seat
- connecting pipe
- shaft connecting
- height
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47D—FURNITURE SPECIALLY ADAPTED FOR CHILDREN
- A47D1/00—Children's chairs
- A47D1/002—Children's chairs adjustable
Abstract
The utility model provides a rotatory baby seat who adjusts back height, including seat and back group, back group extends backward and upwards from the seat rear end, and back group forms the loading area with the seat, and back group includes support frame and the back supporting part of variable extension height. The support frame is arranged at the rear end of the seat and comprises a lower shaft connecting pipe and an upper shaft connecting pipe, the lower shaft connecting pipe extends backwards and upwards from the rear end of the seat, and the upper shaft connecting pipe is pivoted at the upper end of the lower shaft connecting pipe; the back support part can be arranged at an included angle with the lower shaft connecting pipe, one side of the back support part is connected with the upper shaft connecting pipe, and when the upper shaft connecting pipe is pivoted relative to the lower shaft connecting pipe, the back support part can be driven to rotate relative to the lower shaft connecting pipe to change the included angle, and the height of the back support part is interlocked. The rotation angle difference of the lower shaft connecting pipe and the upper shaft connecting pipe is utilized to drive the backrest supporting part to change the extension height, the backrest height adjusting effect is achieved, and the operation is easy.
Description
[ field of technology ]
The application relates to the field of infant products, in particular to a baby seat with a backrest capable of being adjusted in a rotating mode.
[ background Art ]
Infant seats are very commonly used tending products, and some existing infant seat backs cannot adjust the height of the back along with the growth of children, and if the back is too long, the coating property of the back is insufficient for smaller children; if the backrest is too short, it is uncomfortable for a larger child to use and inconvenient to use.
[ invention ]
In order to facilitate adjusting the height of the backrest of an infant seat, the present application provides an infant seat with a swivel-type backrest adjustment.
The application is realized by the following technical scheme:
an infant seat for rotatably adjusting a height of a backrest, comprising:
a seat;
a back set extending rearward and upward from the rear end of the seat, the back set forming a load bearing area with the seat, the back set comprising:
the support frame is arranged at the rear end of the seat and comprises a lower shaft connecting pipe and an upper shaft connecting pipe, the lower shaft connecting pipe extends backwards and upwards from the rear end of the seat, and the upper shaft connecting pipe is pivoted to the upper end of the lower shaft connecting pipe; a kind of electronic device with high-pressure air-conditioning system
And the backrest support part with variable extension height can be arranged at an included angle with the lower connecting pipe, one side of the backrest support part is connected with the upper connecting pipe, and when the upper connecting pipe is pivoted relative to the lower connecting pipe, the backrest support part can be driven to rotate relative to the lower connecting pipe so as to change the included angle and simultaneously link the height variation of the backrest support part.
The baby seat with the backrest height adjusted in the rotating way is characterized in that the backrest group is pivoted to the seat, and the backrest group can adjust the inclination angle relative to the seat.
The lower end of the lower shaft connecting pipe is pivoted with the seat.
The baby seat with the backrest height adjusted in the rotating way is characterized in that the seat is connected to a baby carriage frame, the lower end of the lower shaft connecting tube is pivoted with the baby carriage frame at a position opposite to the rear end of the seat, and the lower shaft connecting tube and the seat form a bearing area.
The baby seat with the backrest height adjusted in the rotating way is characterized in that the backrest supporting part is elastic software and can change the stretching height along with the rotation of the upper shaft connecting pipe.
The baby seat with the backrest height adjusted in a rotating manner is characterized in that the backrest supporting part is folding software comprising at least one folding section, and when the upper shaft connecting pipe rotates, the folding section can be unfolded and folded along with the upper shaft connecting pipe.
The baby seat with the backrest height adjusted in the rotating way comprises the backrest supporting part, wherein the backrest supporting part comprises a control piece used for limiting the folding and unfolding of the folding and unfolding section, and when the control piece releases the folding and unfolding section, the upper shaft connecting pipe can rotate to drive the folding and unfolding section to fold and unfold.
The baby seat with the backrest height adjusted in the rotating way comprises the backrest support part, the backrest support part comprises a lower backrest plate and an upper backrest plate which is connected with the lower backrest plate in a sliding way, the lower end of the lower backrest plate is pivoted with the seat or the lower shaft connecting pipe, and the upper backrest plate is connected with the upper shaft connecting pipe.
The baby seat with the backrest height adjusted in the rotating way is characterized in that one of the lower backrest plate and the upper backrest plate is provided with a guide groove, and the other one of the lower backrest plate and the upper backrest plate is provided with a guide sliding block which is inserted into the guide groove and slides along the guide groove.
The infant seat for rotatably adjusting the height of the backrest as described above, the lower back plate includes lower back guard regions extending forward on opposite sides thereof, and the upper back plate includes upper back guard regions extending forward on opposite sides thereof.
The infant seat for rotatably adjusting the height of a backrest as described above, further comprising:
the top canopy frame is arranged on the supporting frame;
the roof is arranged on the roof frame and the supporting frame, and when the upper shaft connecting pipe rotates relative to the lower shaft connecting pipe, the upper shaft connecting pipe drives the roof to extend or retract.
The infant seat for rotatably adjusting the height of a backrest as described above, further comprising: and the canopy frame is connected with the backrest supporting part, and can move along with the backrest supporting part when the upper shaft connecting pipe rotates relative to the lower shaft connecting pipe to change the included angle.
The baby seat with the backrest height adjusted by rotation is characterized in that the roof frame is connected to the supporting frame in a sliding mode, a linkage rod is pivoted between the roof frame and the backrest supporting part, and the linkage rod can rotate along with the change of the included angle, so that the roof frame is pushed to slide along the supporting frame.
The baby seat with the backrest height adjusted by rotation is characterized in that the linkage rod is pivoted between the top canopy frame and the lower backrest plate.
The baby seat with the backrest height adjusted in the rotating way is characterized in that a pivot joint is arranged between the upper shaft connecting pipe and the lower shaft connecting pipe, and the pivot joint is provided with a one-way ratchet mechanism or a joint locking mechanism capable of being locked in a releasable way.
The infant seat for rotatably adjusting the height of the backrest as described above is provided with a backrest locking mechanism in the backrest support.
Compared with the prior art, the application has the following advantages:
according to the backrest support device, the rotation angle difference of the lower shaft connecting pipe and the upper shaft connecting pipe is utilized to drive the backrest support part to change the extension height, so that the backrest height adjusting effect is achieved, and the operation is easy; through realizing back height adjustment, make this application baby seat can be according to the child demand of different statures, different ages adjust back height, increase the use commonality.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic view of an embodiment of a rotary-type infant seat with a backrest height adjustment, wherein a backrest set is disposed at a first inclination angle with respect to the seat to form an upright section.
Fig. 2 is a schematic view of an infant seat according to an embodiment in which the backrest height is adjusted by rotation.
Fig. 3 is a schematic view showing an example of an infant seat with a rotatable backrest height adjustment after a canopy is removed.
Fig. 4 is a schematic view II of the first embodiment with the canopy removed and the infant seat rotated to adjust the height of the backrest.
Fig. 5 is a schematic view showing a back support portion at the lowest position in a baby seat according to an embodiment in which the height of the back is rotatably adjusted.
Fig. 6 is a schematic view showing a process of adjusting the height of the back support portion in the infant seat according to the embodiment in which the height of the back support is adjusted in a rotating manner.
Fig. 7 is a schematic view showing a back support portion at the highest position in an infant seat according to an embodiment in which the height of the back is rotatably adjusted.
Fig. 8 is a schematic view of a second embodiment of a baby seat with a backrest height adjusted by rotating, wherein the backrest group is at a second inclination angle relative to the seat to form a reclining section, and the backrest support is located at the lowest position.
Fig. 9 is a schematic view showing a process of adjusting the height of a back support portion in an infant seat in which the height of the back is adjusted by rotating in accordance with the second embodiment.
Fig. 10 is a schematic view showing a back support portion at the highest position in the infant seat of the second embodiment in which the height of the back is adjusted by rotation.
Fig. 11 is a schematic view showing a back support portion at the lowest position in the three-rotation type infant seat in which the back height is adjusted according to the embodiment.
Fig. 12 is a schematic view showing a back support portion at the highest position in the infant seat in which the back height is adjusted by three rotations of the embodiment.
Fig. 13 is a schematic view of the back support portion at the lowest position in the infant seat of the four-rotation type backrest height adjustment of the embodiment.
Fig. 14 is a schematic view showing that the backrest support is located at the highest position in the infant seat in which the backrest height is adjusted by rotation of the four embodiments.
Fig. 15 is a schematic view of an infant seat of an embodiment five-turn backrest height adjustment.
[ detailed description ] of the invention
In order to make the technical problems, technical schemes and beneficial effects solved by the application more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
When embodiments of the present application refer to the ordinal terms "first," "second," etc., it is to be understood that only the ordinal terms are used for distinction, unless the ordinal terms are specifically expressed according to the context.
Embodiment one: as shown in fig. 1 to 7, the infant seat for rotatably adjusting the height of the backrest includes a seat 1 and a backrest group 2. The backrest group 2 extends backwards and upwards from the rear end of the seat 1, the backrest group 2 and the seat 1 form a bearing area, and the backrest group 2 comprises a support frame 3 and a backrest support part 4 with variable extension height. The support frame 3 is arranged at the rear end of the seat 1, the support frame 3 comprises a lower shaft connecting pipe 31 and an upper shaft connecting pipe 32, the lower shaft connecting pipe 31 extends backwards and upwards from the rear end of the seat 1, and the upper shaft connecting pipe 32 is pivoted at the upper end of the lower shaft connecting pipe 31; the backrest support 4 can be arranged at an included angle with the lower connecting pipe 31, one side of the backrest support 4 is connected with the upper connecting pipe 32, and when the upper connecting pipe 32 pivots relative to the lower connecting pipe 31, the backrest support 4 can be driven to rotate relative to the lower connecting pipe 31 to change the included angle and simultaneously link the height change of the backrest support 4. The embodiment utilizes the rotation angle difference of the lower shaft connecting pipe and the upper shaft connecting pipe to drive the backrest supporting part to change the extension height, thereby achieving the effect of adjusting the height of the backrest and being easy to operate; through realizing back height adjustment, make this application baby seat can be according to the child demand of different statures, different ages adjust back height, increase the use commonality.
Further, in order to facilitate the user to adjust the position of the backrest group according to the use requirement, the backrest group 2 is pivoted to the seat 1, and the backrest group 2 can adjust the inclination angle relative to the seat. In order to effectively achieve the reclining angle adjustment of the backrest set 2 with respect to the seat, specifically, the lower end of the lower pivot tube 31 is pivotally connected to the seat 1, and the backrest set 2 can be moved from an upright position formed by the first reclining angle shown in fig. 1 to 7 to a reclined position formed by the second reclining angle shown in fig. 8 to 10 with respect to the seat through a conventional angle adjustment mechanism. Of course, the infant seat with the swivel backrest height adjustment of the present embodiment can also be used in combination with an infant frame to achieve the adjustment of the inclination angle of the backrest set 2 relative to the seat, specifically, the seat 1 is connected to an infant frame, the lower end of the lower connecting tube 31 is pivoted to the infant frame at a position opposite to the rear end of the seat 1, and the lower connecting tube 31 and the seat 1 form a bearing area. The effect of adjusting the inclination angle of the backrest group 2 relative to the seat is achieved by the pivoting relationship of the lower pivoting tube 31 and the stroller frame.
Further, in order to effectively realize that the height of the backrest support 4 is extended under the driving of the support frame, the backrest support 4 includes a lower backrest 41 and an upper backrest 42 slidably connected to the lower backrest 41, the lower end of the lower backrest 41 is pivotally connected to the seat 1 or the lower connecting tube 31, and the upper backrest 42 is connected to the upper connecting tube 32. Specifically, the lower backboard 41 is directly pivoted with the seat or the lower connecting pipe 31, or the lower backboard 41 and the upper backboard 42 are wrapped in the software of the backrest set, the lower backboard 41 is pivoted with the seat through the software, and accordingly, the upper backboard 42 can be selectively pivoted with the upper connecting pipe 31 through the software. In order to facilitate the relative sliding of the lower back plate 41 and the upper back plate 42, a guide groove 43 is provided on one of the lower back plate 41 and the upper back plate 42, and a guide slider 44 is provided on the other of the lower back plate 41 and the upper back plate 42, which is inserted into the guide groove 43 and slides along the guide groove 43.
Further, to enhance safety of a child sitting, the lower back plate 41 includes a lower back guard 411 extending forward on opposite sides thereof, and the upper back plate 42 includes an upper back guard 421 extending forward on opposite sides thereof.
Further, in order to facilitate the installation of the support frame and the backrest support, the lower connecting tubes 31 are disposed on two opposite sides of the seat 1, the upper connecting tube 32 is U-shaped, two ends of the upper connecting tube 32 are respectively pivoted with the corresponding lower connecting tubes 31, and a middle portion of the upper connecting tube 32 is connected to a rear side of the upper backrest plate 42.
Further, for the convenience of use for children, the infant seat with the backrest rotatably adjusted in height further comprises a canopy frame 5 and a canopy 6. The roof frame 5 is arranged on the support frame 3; the roof 6 is arranged on the roof frame 5 and the supporting frame 3, and when the upper shaft connecting pipe 32 rotates relative to the lower shaft connecting pipe 31, the upper shaft connecting pipe 32 drives the roof 6 to extend or retract. By rotating the upper pivoting tube 32 to extend or retract the canopy 6, the canopy 6 can be made to make room for the height of the backrest support to change.
Further, in order to facilitate the locking of the relative rotation of the upper shaft connection tube 32 and the lower shaft connection tube after the backrest height adjustment is completed, a pivot joint 8 is provided between the upper shaft connection tube 32 and the lower shaft connection tube 31, and the pivot joint 8 is provided with a unidirectional ratchet mechanism or a releasable joint locking mechanism. The joint locking mechanism can be an existing joint locking mechanism of a baby carrier.
Further, in order to facilitate locking of the back support portion after the back height adjustment is completed, the back support portion 4 is provided with a back locking mechanism. The back lock mechanism may be an existing bassinet back lock mechanism.
Further, for convenience of child riding, a pedal frame 9 is pivotally connected to the end of the seat 1 away from the backrest group 2.
The working principle of the embodiment is as follows:
the rotation angle difference of the lower shaft connecting pipe and the upper shaft connecting pipe is utilized to drive the backrest supporting part to change the extension height, so that the backrest height adjusting effect is achieved, and the backrest support is simple in structure and easy to operate.
Embodiment two: as shown in fig. 8 to 10, the present embodiment is different from the embodiment in that the roof rack 5 is connected to the back support 4, and the roof rack 5 can move with the back support 4 when the upper shaft connection tube 32 rotates with respect to the lower shaft connection tube 31 to change the angle. The canopy frame 5 can move along with the back support portion, and the canopy frame 5 can always be used for shading a child sitting in the most appropriate position.
Specifically, in order to facilitate the movement of the canopy frame, the canopy frame 5 is slidably connected to the support frame 3, a linkage rod 7 is pivotally connected between the canopy frame 5 and the backrest support portion 4, and the linkage rod 7 can rotate along with the change of the included angle, so as to push the canopy frame 5 to slide along the support frame 3. In order to effectively link the movement of the top canopy frame 5, the link 7 is pivotally connected between the top canopy frame 5 and the lower backboard 41. Simple structure and good linkage effect.
Embodiment III: as shown in fig. 11 and 12, the present embodiment is different from the first embodiment in that the backrest support 4 is a flexible piece of software, which can change the stretching height along with the rotation of the upper shaft connection tube 32. The height extension change of the backrest support can be realized by adopting elastic software, and the backrest support has simple structure and convenient use.
Embodiment four: as shown in fig. 13 and 14, the present embodiment is different from the first embodiment in that the backrest support 4 is a folding software including at least one folding section 45, and the folding section 45 can be folded and unfolded when the upper shaft adapter 32 is rotated. The height extension change of the backrest support can be realized by adopting the folding and stretching software with the folding and stretching section 45, and the backrest support has simple structure and convenient use. The folded and stretched section can also enable the backrest support 4 to have a wide range of height variation, thereby being very convenient to use.
Fifth embodiment: as shown in fig. 15, the difference between the present embodiment and the fourth embodiment is that the backrest support 4 includes a control member 46 for limiting the folding and unfolding of the folded and unfolded section 45, and when the folded and unfolded section 45 is released by the control member 46, the upper connecting tube 32 can rotate to drive the folded and unfolded section 45 to fold and unfold, and the control member 46 is a zipper or a drawstring, etc. The control piece can be arranged to be more convenient for a user to control the height change of the backrest support part 4, and the use requirement of the user can be met.
The above description of various embodiments provided in connection with specific content is not intended to limit the practice of the present application to such descriptions. Any approximation, or substitution of techniques for the methods, structures, etc. of the present application or for the purposes of making a number of technological deductions or substitutions based on the concepts of the present application should be considered as the scope of protection of the present application.
Claims (16)
1. An infant seat for rotatably adjusting the height of a backrest, comprising:
a seat (1);
a backrest group (2) extending rearward and upward from the rear end of the seat (1), the backrest group (2) forming a load bearing area with the seat (1), the backrest group (2) comprising:
the support frame (3) is arranged at the rear end of the seat (1), the support frame (3) comprises a lower shaft connecting pipe (31) and an upper shaft connecting pipe (32), the lower shaft connecting pipe (31) extends backwards and upwards from the rear end of the seat (1), and the upper shaft connecting pipe (32) is pivoted at the upper end of the lower shaft connecting pipe (31); a kind of electronic device with high-pressure air-conditioning system
And the backrest support part (4) with variable extension height can be arranged at an included angle with the lower shaft connecting pipe (31), one side of the backrest support part (4) is connected with the upper shaft connecting pipe (32), and when the upper shaft connecting pipe (32) is pivoted relative to the lower shaft connecting pipe (31), the backrest support part (4) can be driven to rotate relative to the lower shaft connecting pipe (31) so as to change the included angle and simultaneously link the height variation of the backrest support part (4).
2. The infant seat with a swivel-type backrest height adjustment according to claim 1, characterized in that the backrest group (2) is pivotally connected to the seat (1), the backrest group (2) being adjustable in inclination angle with respect to the seat.
3. The infant seat of claim 1, wherein the lower end of the lower pivoting tube (31) is pivotally connected to the seat (1).
4. The infant seat with a swivel-type backrest height adjustment according to claim 1, characterized in that the seat (1) is connected to an infant frame, the lower end of the lower pivoting tube (31) being pivoted to the infant frame at a position opposite to the rear end of the seat (1), the lower pivoting tube (31) forming a load-bearing area with the seat (1).
5. The infant seat of claim 1, wherein the back support (4) is a flexible piece of software that changes the stretching height in response to rotation of the upper pivoting tube (32).
6. The infant seat of claim 1, wherein the back support (4) is a fold-over software comprising at least one fold-over section (45), said fold-over section (45) being foldable with it when the upper swivel tube (32) is rotated.
7. The infant seat of claim 6, wherein the back support (4) includes a control member (46) for limiting the folding of the fold-over section (45), the upper pivoting tube (32) being rotatable to bring the fold-over section (45) to fold-over when the control member (46) releases the fold-over section (45).
8. The infant seat of claim 1, wherein the backrest support (4) comprises a lower backrest plate (41) and an upper backrest plate (42) slidably connected to the lower backrest plate (41), the lower end of the lower backrest plate (41) is pivotally connected to the seat (1) or the lower connecting tube (31), and the upper backrest plate (42) is connected to the upper connecting tube (32).
9. The infant seat according to claim 8, wherein one of the lower back plate (41) and the upper back plate (42) is provided with a guide groove (43), and the other of the lower back plate (41) and the upper back plate (42) is provided with a guide slider (44) inserted into the guide groove (43) and slid along the guide groove (43).
10. The rotary back height adjustment infant seat according to claim 8, wherein the lower back panel (41) includes lower back guard areas (411) extending forward on opposite sides thereof and the upper back panel (42) includes upper back guard areas (421) extending forward on opposite sides thereof.
11. The infant seat for rotatably adjusting a height of a backrest according to claim 1, further comprising:
a top canopy frame (5) arranged on the support frame (3);
the roof (6) is arranged on the roof frame (5) and the supporting frame (3), and when the upper shaft connecting pipe (32) rotates relative to the lower shaft connecting pipe (31), the upper shaft connecting pipe (32) drives the roof (6) to extend or shrink.
12. The infant seat for rotatably adjusting a height of a backrest according to claim 8, further comprising: the canopy frame (5), canopy frame (5) with back supporting part (4) are connected, when upper shaft connecting pipe (32) are rotated for lower shaft connecting pipe (31) and are changed the contained angle, canopy frame (5) can follow back supporting part (4) removes.
13. The baby seat with the rotary backrest height adjusting function according to claim 12, wherein the roof rack (5) is slidably connected to the supporting frame (3), a linkage rod (7) is pivoted between the roof rack (5) and the backrest supporting portion (4), and the linkage rod (7) can rotate along with the change of the included angle so as to push the roof rack (5) to slide along the supporting frame (3).
14. The infant seat according to claim 13, wherein the link lever (7) is pivotally connected between the roof rack (5) and the lower back plate (41).
15. The infant seat of claim 1, wherein a pivot joint (8) is provided between the upper and lower pivot tubes (32, 31), the pivot joint (8) being provided with a one-way ratchet mechanism or a releasable joint locking mechanism.
16. The infant seat of claim 1, wherein the back support (4) is provided with a back locking mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110341674.8A CN112998478B (en) | 2021-03-30 | 2021-03-30 | Baby seat with rotary backrest height adjustment function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110341674.8A CN112998478B (en) | 2021-03-30 | 2021-03-30 | Baby seat with rotary backrest height adjustment function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112998478A CN112998478A (en) | 2021-06-22 |
| CN112998478B true CN112998478B (en) | 2023-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110341674.8A Active CN112998478B (en) | 2021-03-30 | 2021-03-30 | Baby seat with rotary backrest height adjustment function |
Country Status (1)
| Country | Link |
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| CN (1) | CN112998478B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113619671B (en) * | 2021-07-15 | 2023-06-27 | 好孩子儿童用品有限公司 | Seat pocket assembly and child cart |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7066536B2 (en) * | 2002-02-11 | 2006-06-27 | Graco Children's Products Inc. | Child seat |
| CN2686459Y (en) * | 2004-03-16 | 2005-03-23 | 艾多拉实业股份有限公司 | Infants' chair with back inclination adjusting function |
| WO2006033490A1 (en) * | 2004-09-22 | 2006-03-30 | Byung-Chul Lee | Chair |
| CN2887661Y (en) * | 2006-02-24 | 2007-04-11 | 宁波新宝工业有限公司 | Vehicular safe seat for children |
| CN102275531B (en) * | 2011-05-23 | 2013-06-26 | 湖南大学 | Multifunctional child safety seat |
| CN206968751U (en) * | 2017-05-05 | 2018-02-06 | 好孩子儿童用品有限公司 | A kind of baby seat pocket and children trolley |
| JP2019156214A (en) * | 2018-03-14 | 2019-09-19 | 株式会社リッチェル | Baby carriage |
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2021
- 2021-03-30 CN CN202110341674.8A patent/CN112998478B/en active Active
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| CN112998478A (en) | 2021-06-22 |
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