CN102275531A - Multifunctional child safety seat - Google Patents

Multifunctional child safety seat Download PDF

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Publication number
CN102275531A
CN102275531A CN2011101336834A CN201110133683A CN102275531A CN 102275531 A CN102275531 A CN 102275531A CN 2011101336834 A CN2011101336834 A CN 2011101336834A CN 201110133683 A CN201110133683 A CN 201110133683A CN 102275531 A CN102275531 A CN 102275531A
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CN
China
Prior art keywords
safety seat
support
child safety
backrest
child
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Granted
Application number
CN2011101336834A
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Chinese (zh)
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CN102275531B (en
Inventor
曹立波
白中浩
张冠军
付家焱
赵贤阳
李靖
周雪桂
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Changsha Lizhong Automobile Design and Development Co Ltd
Hunan University
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Changsha Lizhong Automobile Design and Development Co Ltd
Hunan University
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Application filed by Changsha Lizhong Automobile Design and Development Co Ltd, Hunan University filed Critical Changsha Lizhong Automobile Design and Development Co Ltd
Priority to CN 201110133683 priority Critical patent/CN102275531B/en
Publication of CN102275531A publication Critical patent/CN102275531A/en
Application granted granted Critical
Publication of CN102275531B publication Critical patent/CN102275531B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention discloses a multifunctional child safety seat, belonging to the field of child safety protection, the multifunctional child safety seat aims at solving problems that the structure of a current child safety seat is relatively single, applicable range of child age is narrow, and price is high. The child safety seat comprises a base support, a cushion, a backrest support, and a back cushion, the two sides of the base support are provided with an armrest support, the connecting part of the base support and the backrest support is provided with a backrest angle adjusting mechanism adjusting the angle of the backrest support, the backrest support is provided with a height adjusting mechanism adjusting the height of the back cushion. The child safety seat can not only be used as a backward or forward automobile child safety seat, but can also be installed on a handcart support and used as a handcart, and the function of the automobile-used child safety seat and the function of the handcart are combined. The multifunctional child safety seat is advantaged by simple structure, low cost, wide application range, facilitation of parents to take the child out on a trip, and extremely high popularization and application value.

Description

The multifunctional children safety seat
Technical field
The present invention relates to automobile children safety protection field, refer in particular to a kind of both can being installed on the automotive seat, also can be installed in the multifunctional children safety seat on the hand barrow support.
Background technology
In recent years along with the high speed development of Domestic Automotive Industry, the increase of China's automobile pollution, the accident rate that various children ride also increases rapidly, and the safety problem that children ride becomes the problem that people extremely pay close attention to.Usually the children of all ages and classes section need dissimilar child safety seats that protection is provided.Abroad, the use of child safety seat is very universal, and in China, the Occupation coefficient of child seat is but very low.Its reason has the following aspects, and at first: China starts late to children's security study of riding, and does not does not also issue and implement relevant laws and regulations so far, and children are forced to use child safety seat by bus; Secondly: China father and mother are to the ride shortage of awareness of safety of children, when the head of a family generally believes by bus children are embraced in the bosom safely, there is no need to use child safety seat; The the 3rd: child seat price comparison costliness.
At present, because the baby carriage price is more cheap, the domestic child's of having family has a baby carriage usually, but the only suitable usually short range delivery of baby carriage children.When children go on a journey by bus, need the child safety seat protection children safety of riding; But when children do not ride or are in, just need baby carriage.Therefore, both considered children's safety of riding, considered out accommodatingly again that the multifunctional children safety seat that automobile children safety chair and hand barrow function are combined will become the first-selection of China family.
Summary of the invention
More single at existing child safety seat structure of chair, the child age narrow range and the expensive defective that are suitable for, the present invention aims to provide a kind of multifunctional children safety seat, guarantees that children have the automobile children safety chair protection children safety of riding when going on a journey by bus; But when children not by bus or have the baby carriage convenient for children to take when being in, this armchair structure simple compact, range of use is wide, with low cost, can be for children's use in 0-3 years old.When this child safety seat uses as automobile children safety chair, both can be installed on the automobile rear seat, and can be installed on the automobile rear seat to the mode of installing later on again and use in the mode that forward direction is installed.Simultaneously, also can be installed on the hand barrow support and use, make things convenient for father and mother to carry children's trip as baby carriage.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: described multifunctional children safety seat, its constructional feature is that it comprises base, backrest, regulates the backrest height regulating mechanism of backrest height and regulates the backrest angle regulating mechanism of the backrest anglec of rotation; This child safety seat is installed according to one of following dual mode:
1), described child safety seat is rigidly connected device with forward direction or back to being installed on the automotive seat by safety strap or ISOFIX;
2), described child safety seat is with forward direction or back to being installed on the hand barrow support, armrest support is equipped with in the base both sides of this child safety seat, this armrest support is provided with kayser, and described hand barrow support is provided with the connecting pin that is connected with described kayser.
Described ISOFIX is meant International Standardization Organization's (child safety seat) anchor fitting.
Further, described base comprises metab support and the cushion that is contained on this base support, and described armrest support is contained in the base support both sides of base, with hinge handle is installed on the rear end of this armrest support.
Further, described backrest comprises the metal back bracket and is located at the back cushion of back bracket inboard, is contained in the backrest height regulating mechanism on the back bracket.For the children's that adapt to all ages and classes rising, thereby correspondingly adjust the back cushion height, be provided with this backrest height regulating mechanism.Described backrest height regulating mechanism structure optimization is, comprises the sleeve that is fixed on the back bracket, and part is contained in the pull bar in this sleeve, is provided with the locking mechanism of fit adjustment back cushion height between this pull bar and the sleeve; The structure of described locking mechanism is, has a plurality of positioning grooves on the described pull bar, and described sleeve is provided with the buckle with positioning groove fit adjustment back cushion height.
The structure optimization of described backrest angle regulating mechanism is, comprise movable arm that is fixed on the described back bracket and the fixed arm that is fixed on the base support, establish the recliner of the anglec of rotation of adjusting movable arm relative fixed arm in the junction of described movable arm and fixed arm.
The armrest support rear end of described child safety seat is provided with two ends and is movably connected in handle on the armrest support respectively, and this handle is provided with the safety strap guiding mechanism, can child seat be fixed on the automotive seat convenient and safe band.
For mating part is provided with the automotive seat of ISOFIX, the ISOFIX device that is rigidly connected is equipped with in described base support bottom.
In order more fully to protect children, be provided with shoulder protector in described back bracket both sides.
Described forward direction is installed, and soon towards the tailstock, children sit to consistent with the adult towards car the place ahead child safety seat according to common base support.
Described back is to installation, and the base support that is about to child safety seat is towards the headstock direction, and children sit to opposite with the adult towards the car rear, and this mode can more effectively be protected children's head and neck.
Below the present invention is further described.
A kind of multifunctional children safety seat is made up of four-point or five-point type safety strap, backrest angle regulating mechanism, handrail, safety strap guiding mechanism, kayser, pull bar, sleeve, shoulder protector, base support, back bracket, back cushion and cushion etc.Described child safety seat can be later on to or the forward directed mounting means be fixed on the automobile rear seat, realize the function of automobile children safety chair; Or be installed on the hand barrow support, become the hand barrow that can deliver children.Wherein, the rod member part in the child safety seat is by being welded to connect, and the safety strap guiding mechanism has open slot.The backrest angle regulating mechanism can be realized the angular adjustment of the whole backrest of child safety seat, and pull bar has two positioning grooves, can pass through snaps into position, can regulate the height of backrest simultaneously according to different children's height.Kayser is installed in the both sides of handrail, and the handrail both sides have groove simultaneously.Back cushion has the belt guiding mouth of two diverse locations, and four-point or five-point type safety strap can be derived by different guiding ports, can use different guiding ports to draw safety strap according to the body size of child passenger.
Described backrest angle regulating mechanism is made up of movable arm, fixed arm, recliner and rivet, and movable arm is connected with recliner by rivet respectively with fixed arm, movable arm and back bracket welding.Regulate recliner, can drive the movable arm rotation, thereby realize the angular adjustment of the whole backrest of child safety seat.Described pull bar has plural positioning groove, can pass through snaps into position, thereby realizes the adjusting of backrest height.
Child safety seat was realized with being connected in the following way of hand barrow support, launched whole hand barrow support, and the kayser of described child safety seat is connected with the connecting pin of hand barrow support; The groove fit of the strut bar of hand barrow support and the handrail of child safety seat simultaneously, for child safety seat provides support, the reliable location that is connected of realization child safety seat and hand barrow support, thus child safety seat is fixed on the hand barrow support.
Child safety seat is realized with being connected as follows of automotive seat by adult's body-restraining seat belt, is less than the child passenger that equals 13kg for body weight, needs to adopt the back to mounting means.With after the child safety seat to mode be placed on the automobile rear seat, be grown up waistband portion in the safety strap of bikini is passed open slot in the safety strap guiding mechanism of multifunctional children safety seat, shoulder belt is partly walked around the back part of multifunctional children safety seat, by bracelet body-restraining seat belt is locked again.For the child passenger of body weight, adopt forward direction mounting means or back all can to mounting means greater than 13kg.For the forward direction mounting means, be with children install before the seat to mode be placed on automobile rear seat, with bikini the be grown up shoulder belt of safety strap and the shoulder protector that waistband passes the multifunctional children safety seat respectively, by bracelet body-restraining seat belt is locked again.More than two kinds of mounting meanss, all the child safety seat failure-free can be fixed on the automobile rear seat.
Utilize ISOFIX be rigidly connected device or body-restraining seat belt with child seat with forward direction and back to the mode failure-free be fixed on the automobile rear seat.
When the present invention uses as automobile children safety chair, can the mode of child safety seat with backward type or forward-type be placed on the automobile rear seat, utilize adult's safety strap or ISOFIX device to fix according to children's body weight.The angle of the backrest of child safety seat and height can be regulated according to children's height and comfort level.When doing the hand barrow use, can child safety seat be fixed on the hand barrow support by connecting pin and strut bar.This child safety seat is wider to the Applicable scope of child age, and simple in structure, cheap, easy to use, has made things convenient for father and mother to be with children to go on a journey, and has higher popularization and application values.
Main academic thoughts of the present invention: at the children of different weight, all ages and classes, with child safety seat with forward direction or back to mode be installed on the automobile rear seat, the protection children safety of riding realizes the function of automobile children safety chair; Child safety seat can be installed on the hand barrow support in addition, realize the function of hand barrow.This invention can provide protection by bus for the children in 0-3 year, is convenient to closely and remote delivery children, has made things convenient for father and mother to carry children's trip.
Compared with prior art, the invention has the beneficial effects as follows:
1, child safety seat of the present invention both can be installed in and do the baby carriage use on the hand barrow support, can make child safety seat again and use, and realized multi-functional use.During as the baby stroller seat, can realize the back of seat angular adjustment, satisfy the different prone position angle of child demand;
2, child safety seat of the present invention, the rod member skeleton structure that employing is, the simpler compactness of structure, with low cost easy to use, can installation and removal on baby stroller quickly and easily, and the strength and stiffness of structure are good, make things convenient for father and mother to be with children to go on a journey, had higher popularization and application values.
3, child safety seat of the present invention, in use, can be according to the difference of 0-1 year and 1-3 year children's micromechanism of damage, regulate the backrest angle and the height of child safety seat, what children can be very in taking process is comfortable and safe, and general basket type seat can only be with 1 year, and the present invention is general at 0 ~ 3 years old, period of service is long, when guaranteeing safety, has saved children's the cost of bringing up.
4, attractive in appearance, the ride comfort of child safety seat structure of the present invention, as the multifunctional children safety seat time, can not cause damage to the automotive seat surface.
 
The present invention is further elaborated below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the present invention;
Fig. 2 is the back view of Fig. 1;
Fig. 3 is that an embodiment of the present invention forward direction is installed in the running condition scheme drawing on the automotive seat;
Fig. 4 is to the running condition scheme drawing that is installed on the automotive seat after an embodiment of the present invention;
Fig. 5 is the structural representation of baby carriage of the present invention;
Fig. 6 is the structural representation of hand barrow support of the present invention;
Fig. 7 is a backrest height adjustment structure scheme drawing of the present invention;
Fig. 8 is an embodiment of the invention backrest angle adjustment structure scheme drawing.
In the drawings:
The 1-child safety seat; 2-hand barrow support; The 3-safety strap;
4-backrest angle regulating mechanism; The 5-buckle; The 6-armrest support;
7-safety strap guiding mechanism; The 8-kayser; The 9-pull bar;
The 10-sleeve; The 11-shoulder protector; The 12-base support;
The 13-back bracket; The 14-back cushion; The 15-cushion;
The 16-connecting pin; The 17-strut bar; The 18-positioning groove;
The 19-movable arm; The 20-fixed arm; The 21-recliner;
The 22-rivet; The 23-automotive seat; The 24-handle;
The 25-base; The 26-backrest; The 27-ISOFIX device that is rigidly connected;
28-backrest height regulating mechanism; The 29-locking mechanism.
 
The specific embodiment
The present invention is described in further detail below with reference to the drawings and specific embodiments.
As illustrated in fig. 1 and 2, described multifunctional children safety seat 1 is by four-point or five-point type adult's safety strap 3 or ISOFIX(International Standardization Organization<child safety seat〉anchor fitting), backrest angle regulating mechanism 4, buckle 5, armrest support 6, safety strap guiding mechanism 7, kayser 8, pull bar 9, sleeve 10, shoulder protector 11, rod member 12, stirrup 13, back cushion 14 and cushion 15 etc. form.Wherein the rod member of child safety seat 1 part is by being welded to connect, and safety strap guiding mechanism 7 has open slot.The structure of backrest angle regulating mechanism 4 as shown in Figure 8, form by movable arm 19, fixed arm 20, recliner 21 and rivet 22, movable arm 19 is connected with recliner 21 by rivet 22 respectively with fixed arm 20, movable arm 19 and back bracket 13 welding, fixed arm 20 and base support 12 welding.Regulate recliner 21, can drive movable arm 18 rotations, thereby realize the angular adjustment of the whole backrest of child safety seat 1.The backrest height of child safety seat 1 can be regulated by pull bar 9 and buckle 5, and as shown in Figure 7, pull bar 9 has two positioning grooves 18, can locate by buckle 5, thereby realize the adjusting of child safety seat 1 backrest height secondary.Kayser 8 is installed in the both sides of armrest support 6, and armrest support 6 both sides have groove simultaneously.Armrest support 6 is equipped with in described base support 12 both sides, is provided with the handle 24 that two ends are movably connected in two armrest support 6 rear ends respectively in the front portion of child safety seat 1, and described armrest support 6 is provided with safety strap guiding mechanism 7.When children need be sitting on the child safety seat 1, handle 24 rotated to an angle around fulcrum lift, after children occupy stably, handle 24 is screwed off, with protection children's front portion.
For mating part is provided with the automotive seat of ISOFIX, the ISOFIX device 27 that is rigidly connected is equipped with in described base support 12 bottoms.
Shown in Fig. 3 and 4, when the present invention does the automobile children safety chair use, adopt bikini adult belt installation that dual mode is arranged.Be less than the child passenger that equals 13kg for body weight, need to adopt the back to mounting means.With after the child safety seat 1 to mode be placed on the automobile rear seat, be grown up waistband portion in the safety strap of bikini is passed open slot in the safety strap guiding mechanism 7 of child safety seat 1, shoulder belt is partly walked around the back part of child safety seat 1, by bracelet body-restraining seat belt is locked again.For the child passenger of body weight, adopt forward direction mounting means or back all can to mounting means greater than 13kg.For the forward direction mounting means, be that child safety seat is placed on automobile rear seat in the forward directed mode, with bikini the be grown up shoulder belt of safety strap and the shoulder protector 11 that waistband passes child safety seat 1 respectively, by bracelet body-restraining seat belt is locked again.More than two kinds of mounting meanss, all child safety seat 1 failure-free can be fixed on the automobile rear seat.
Embodiment 2
A kind of baby carriage, as illustrated in Figures 5 and 6, comprise hand barrow vehicle frame 2, this hand barrow vehicle frame 2 has the strut bar 17 of both sides, on hand barrow vehicle frame 2, be equipped with forward direction or back to child safety seat 1 is installed, the strut bar 17 of this hand barrow vehicle frame 2 is provided with a connecting pin 16, described child safety seat 1 is housed in the strut bar 17 of described hand barrow vehicle frame 2, armrest support 6 outsides of this child safety seat 1 are provided with child safety seat 1 are fixed on kayser 8 on the hand barrow vehicle frame 2, and described kayser 8 matches with described connecting pin 16; Described child safety seat comprises base 25 and backrest 26; Wherein base 25 comprises base support 12 and the cushion 15 that is contained on the base support 12, and armrest support 6 is equipped with in these base support 12 both sides, and described backrest 26 comprises back bracket 13 and is located at the back cushion 14 of back bracket 13 inboards; The height adjustment mechanism of regulating back cushion 14 height is housed on the described back bracket 13, described backrest height regulating mechanism structure is, comprise the sleeve 10 that is fixed on the back bracket 13, part is contained in the pull bar 9 in this sleeve 10, have a plurality of positioning grooves 18 on this pull bar 9, and with the buckle 5 of positioning groove 18 fit adjustment back cushions 14 height; The junction of described base support 12 and back bracket 13 is provided with the backrest angle regulating mechanism 4 of regulating back bracket 13 angles; The structure of described backrest angle regulating mechanism 4 is, comprise movable arm 19 that is fixed on the described back bracket 13 and the fixed arm 20 that is fixed on the base support 12, be provided with the recliner 21 of the anglec of rotation of adjusting movable arm 19 relative fixed arms 20 in the junction of described movable arm 19 and fixed arm 20.
As illustrated in Figures 5 and 6, when the present invention does the baby carriage use, at first, launch whole hand barrow support 2, the structural representation of hand barrow support 2 as shown in Figure 5.The kayser 8 of child safety seat 1 is connected with the connecting pin 16 of hand barrow support 2; The strut bar 17 of hand barrow support 2 and the groove fit of child safety seat 1 armrest support 6 for child safety seat 1 provides support, thereby are fixed on child safety seat 1 on the hand barrow support 2 simultaneously.Certainly, also can flexibly connect handle 24, at this moment, then not need to install handle 24 on the armrest support 6 of child safety seat 1 in the front portion of hand barrow support 2
Armrest support 6 is equipped with in base support 12 both sides at described baby carriage, is provided with the handle 24 that two ends are movably connected in two armrest support 6 rear ends respectively in the front portion of child safety seat 1, and described armrest support 6 is provided with safety strap guiding mechanism 7.Described handle 24 can be protected the children front portion when carrying out, when needs take off child safety seat, with handle 24 around rotating a certain angle, as the seat handle.
The content that the foregoing description is illustrated should be understood to these embodiment and only is used to be illustrated more clearly in the present invention, limit the scope of the invention and be not used in, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.

Claims (8)

1. a multifunctional children safety seat is characterized in that, it comprises base (25), backrest (26), regulates the backrest height regulating mechanism (28) of backrest (26) height and regulates the backrest angle regulating mechanism (4) of backrest (26) anglec of rotation; This child safety seat (1) is installed according to one of following dual mode:
1), described child safety seat (1) is rigidly connected device (27) with forward direction or back to being installed on the automotive seat (23) by safety strap (3) or ISOFIX;
2), described child safety seat (1) is with forward direction or back to being installed on the hand barrow support (2), armrest support (6) is equipped with in base (25) both sides of this child safety seat (1), this armrest support (6) is provided with kayser (8), and described hand barrow support (2) is provided with the connecting pin (16) that is connected with described kayser (8).
2. multifunctional children safety seat according to claim 1, it is characterized in that, described base (25) comprises metab support (12) and is contained in cushion (15) on this base support (12), described armrest support (6) is contained in base support (12) both sides of base (25), with hinge (29) handle (24) is installed on the rear end of this armrest support (6).
3. multifunctional children safety seat according to claim 1 and 2, it is characterized in that, described backrest (26) comprises metal back bracket (13) and is located at the inboard back cushion (14) of back bracket (13), is contained in the backrest height regulating mechanism (28) on the back bracket (13); Described backrest height regulating mechanism (28) structure is, comprise the sleeve (10) that is fixed on the back bracket (13), part is contained in the pull bar (9) in this sleeve (10), is provided with the locking mechanism (29) of fit adjustment back cushion (14) height between this pull bar (9) and the sleeve (10).
4. multifunctional children safety seat according to claim 1 and 2, it is characterized in that, the structure of described backrest angle regulating mechanism (4) is, comprise the movable arm (19) that is fixed on the described back bracket (13) and be fixed on fixed arm (20) on the base support (12), establish the recliner (21) of the anglec of rotation of adjusting movable arm (19) relative fixed arm (20) in the junction of described movable arm (19) and fixed arm (20).
5. multifunctional children safety seat according to claim 1, it is characterized in that, armrest support (6) rear end of described child safety seat (1) is provided with two ends and is movably connected in handle (24) on the armrest support (6) respectively, and this handle (24) is provided with safety strap guiding mechanism (7).
6. multifunctional children safety seat according to claim 3, it is characterized in that, the structure of described locking mechanism is, has a plurality of positioning grooves (18) on the described pull bar (9), and described sleeve (10) is provided with the buckle (5) with positioning groove (18) fit adjustment back cushion (14) height.
7. multifunctional children safety seat according to claim 1 and 2 is characterized in that, the described ISOFIX device (27) that is rigidly connected is contained in the bottom of base support (12).
8. multifunctional children safety seat according to claim 1 and 2 is characterized in that, described back bracket (13) both sides are provided with shoulder protector (11).
CN 201110133683 2011-05-23 2011-05-23 Multifunctional child safety seat Expired - Fee Related CN102275531B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN102275531B CN102275531B (en) 2013-06-26

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Cited By (8)

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CN103919657A (en) * 2014-04-22 2014-07-16 浙江日峰电器有限公司 Massage armchair rack
CN104149663A (en) * 2014-07-22 2014-11-19 杨晓柏 Multifunctional safety seat for child
WO2017173711A1 (en) * 2016-04-07 2017-10-12 上海沃雨电子科技有限公司 Foldable manual child safety seat
CN107662631A (en) * 2017-11-25 2018-02-06 李永超 A kind of multifunctional baby carriage
CN108116281A (en) * 2017-12-21 2018-06-05 陈泽楠 A kind of children of automobile protective device
CN108974096A (en) * 2017-06-02 2018-12-11 上海宝糖科技有限公司 Seat pocket on children trolley
CN109760562A (en) * 2019-03-14 2019-05-17 大连理工大学 It can be exchanged into the Multifunctional safety chair for children of children trolley
CN112998478A (en) * 2021-03-30 2021-06-22 广东乐美达集团有限公司 Baby seat with rotary adjustable backrest height

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103919657A (en) * 2014-04-22 2014-07-16 浙江日峰电器有限公司 Massage armchair rack
CN103919657B (en) * 2014-04-22 2016-02-03 浙江日峰电器有限公司 A kind of massage armchair framework
CN104149663A (en) * 2014-07-22 2014-11-19 杨晓柏 Multifunctional safety seat for child
CN107264348B (en) * 2016-04-07 2020-03-31 上海沃雨电子科技有限公司 Folding manual child safety seat
CN107264348A (en) * 2016-04-07 2017-10-20 上海沃雨电子科技有限公司 A kind of Foldable hand child safety seat
WO2017173711A1 (en) * 2016-04-07 2017-10-12 上海沃雨电子科技有限公司 Foldable manual child safety seat
CN108974096A (en) * 2017-06-02 2018-12-11 上海宝糖科技有限公司 Seat pocket on children trolley
CN108974096B (en) * 2017-06-02 2024-03-19 上海宝糖科技有限公司 Seat pocket on baby carriage
CN107662631A (en) * 2017-11-25 2018-02-06 李永超 A kind of multifunctional baby carriage
CN108116281A (en) * 2017-12-21 2018-06-05 陈泽楠 A kind of children of automobile protective device
CN109760562A (en) * 2019-03-14 2019-05-17 大连理工大学 It can be exchanged into the Multifunctional safety chair for children of children trolley
CN109760562B (en) * 2019-03-14 2023-11-24 大连理工大学 Multifunctional child safety seat convertible into child cart
CN112998478A (en) * 2021-03-30 2021-06-22 广东乐美达集团有限公司 Baby seat with rotary adjustable backrest height

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