CN108177565B

CN108177565B - Children growth device

Info

Publication number: CN108177565B
Application number: CN201710912101.XA
Authority: CN
Inventors: 崔宗旺
Original assignee: Mingmen Hong Kong Co ltd
Current assignee: Mingmen Hong Kong Co ltd
Priority date: 2016-12-08
Filing date: 2017-09-29
Publication date: 2021-01-12
Anticipated expiration: 2037-09-29
Also published as: CN108177565A

Abstract

The invention provides a child growth device, comprising: the first seat part and the second seat part are pivoted with each other, the first seat part is provided with a cavity, and the second seat part is contained in the cavity when the child growth device is folded; when the child growth device is unfolded, the second seat part and the first seat part are coplanar to form a seat part, and a safety belt hook is installed on the side surface of the seat part. The seat can be folded when not in use, thereby saving the storage space.

Description

Children growth device

Technical Field

The invention relates to a child growth device, in particular to a foldable child growth device.

Background

The child growth devices are largely demanded by the market as necessities for securing riding safety of children. One existing child growth device for older children is a seat cushion that is fixedly attached directly to the vehicle seat and does not have a backrest. Such child growth devices typically include a seat portion and a belt hook that is secured to a belt buckle on the vehicle by a belt on the vehicle that passes over the shoulders and waist of the child and then through the belt hook. However, such child growth devices occupy a large storage space due to their large size and their inability to fold.

Therefore, there is a need for a child growth device with a simple structure and a space saving effect.

Disclosure of Invention

An object of the present invention is to provide a child growth device which can fold a seat in a non-use state, thereby saving a storage space.

To achieve the above object, the present invention provides a child growth device, comprising: the first seat part and the second seat part are pivoted with each other, the first seat part is provided with a cavity, and the second seat part is contained in the cavity when the seat is folded; when the seat is unfolded, the second seat part and the first seat part form a seat part, and a safety belt hook is installed on the side surface of the seat part.

Compared with the prior art, the child growth device has the advantages that the second seat part is accommodated in the cavity of the first seat part in the folded state. Therefore, the folded seat has small volume and saves the storage space.

Preferably, the rear end of the first seat portion is pivotally connected to the front of the first seat portion through a rotating shaft, and the seat belt hook is rotatably connected to the side surface of the seat portion through the rotating shaft. Thus, the safety belt hook can rotate to another position (such as a horizontal position) when the seat is folded, and does not protrude out of the first seat part and the second seat part, so that the size is further reduced, and the safety coefficient is improved.

As an embodiment, a mounting seat is arranged on a side surface of the seat portion to mount the seat belt hook, and the mounting seat is connected with the seat belt hook through a rotating pin.

Preferably, a positioning protrusion is arranged on the side surface of the seat part, and a positioning recess is arranged on the safety belt hook to clamp the positioning protrusion.

Preferably, the seat belt hook is provided with a first protrusion and a second protrusion, and the positioning recess is formed between the first protrusion and the second protrusion.

Preferably, the extending direction of the first convex part and the second convex part is perpendicular to the extending direction of the positioning protrusion.

Preferably, a support member is disposed on a bottom surface of the second seat portion, and the support member is made of a soft material.

Preferably, the first seat portion and the second seat portion are covered with soft cloth.

Preferably, the method further comprises positioning webbing to bind the first seat portion and the second seat portion in a folded condition.

Preferably, a plurality of ventilation holes are formed on the top surfaces of the first seat part and the second seat part.

As another embodiment, a joint portion is disposed at a pivot joint of the rear end of the first seat portion, the joint portion includes a central through hole, a gear located at the central through hole and connected to the front end of the second seat portion, at least one receiving groove located at the periphery of the gear, and at least one driven wheel rotatable relative to the first seat portion, and an outer surface of the driven wheel interferes with an outer surface of the gear.

Preferably, a connecting part for fixedly connecting with the gear is arranged at the pivot joint of the front end of the second seat part.

Preferably, the safety belt hook is provided with an installation part connected with the joint part, the side wall of the installation part is accommodated in the accommodating groove, and the side wall of the installation part is provided with internal teeth interfering with the outer surface of the driven wheel.

Preferably, the mounting portion is provided with at least one limiting protrusion, and the limiting protrusion is movably accommodated in the accommodating groove.

Preferably, the moving track of the limiting protrusion in the accommodating groove is arc-shaped, and the moving angle range is not greater than 90 degrees.

Preferably, the connecting portion includes a gear fixing recess, and a gear fixing protrusion engaged with the gear fixing recess is provided at an end of the gear.

Accordingly, the present invention provides a child growth device comprising: the rear end of the first seat part is pivoted with the front end of the second seat part through a rotating shaft; when the child growth device is unfolded, the second seat part and the first seat part are coplanar to form a seat part, and a safety belt hook is mounted on the side surface of the seat part, is rotatably connected to the side surface of the seat part through the rotating shaft and is linked with the rotating shaft between the second seat part and the first seat part.

Preferably, a joint part is arranged at the pivot joint of the rear end of the first seat part, the joint part comprises a central through hole, a gear which is positioned at the central through hole and connected with the front end of the second seat part, at least one accommodating groove which is positioned at the periphery of the gear, and at least one driven wheel which can rotate relative to the first seat part, and the linkage is realized by interference between the outer surface of the driven wheel and the outer surface of the gear.

As another embodiment, a joint portion, a sun gear mounted on the joint portion and connected to the front end of the second seat portion, and a plurality of planet gears mounted on the joint portion and meshed with the sun gear are provided at the pivot joint of the rear end of the first seat portion.

Preferably, the safety belt hook is provided with a mounting part connected with the joint part, and the mounting part is provided with an inner gear ring meshed with the planet gear.

Preferably, the joint part is provided with a mounting rib, and the planet wheel is mounted on the mounting rib.

Preferably, the plurality of planet wheels are uniformly arranged on the periphery of the sun wheel.

Drawings

Fig. 1 is a perspective view of a child growth device according to a first embodiment of the present invention in an unfolded state.

Fig. 2 is a perspective view of the child growth device according to the first embodiment of the present invention at another angle in the unfolded state.

Fig. 3 is a partial schematic view of a child growth device according to a first embodiment of the invention in an unfolded state.

Fig. 4 is a perspective view of a seat belt hook of the first embodiment of the child growth device of the present invention.

Fig. 5 is a state diagram of the child growth device according to the first embodiment of the present invention during the folding process.

Fig. 6 is a perspective view of the child growth device according to the first embodiment of the present invention in a folded state.

Fig. 7-9 show schematic views of other embodiments of the child growth device of the present invention.

Fig. 10 is a perspective view of a child growth device according to a second embodiment of the present invention in an unfolded state.

Fig. 11 is a state diagram of the child growth device in the folding process according to the second embodiment of the present invention.

Fig. 12 is a perspective view of a child growth device according to a second embodiment of the present invention in a collapsed state.

FIG. 13a is a partial schematic view of a child growth apparatus according to a second embodiment of the invention in an expanded state

Fig. 13b is a side view of a partial component of a second embodiment of the child growth device of the present invention.

Fig. 14 is an exploded perspective view of a child growth device according to a second embodiment of the present invention in an unfolded state.

Fig. 15 shows the gear on the second seat portion of the second embodiment of the child growth device of the present invention.

Fig. 16 is a perspective view of a harness hook of a second embodiment of the child growth device of the present invention.

Fig. 17a-17b are partial schematic views of a child growth apparatus according to a second embodiment of the invention from different viewing angles in an unfolded state.

Fig. 18 is a partial schematic view of a child growth device according to a third embodiment of the invention in an unfolded state.

Fig. 19 is an exploded perspective view of a child growth device according to a third embodiment of the present invention in an unfolded state.

Fig. 20 is a perspective view of a harness hook of a second embodiment of the child growth device of the present invention.

Reference numbers for various elements in the figures illustrate:

child growth apparatus 100, 100' hook 132

The first seat portion 110 positioning recess 133

First protrusion 134 of cavity 111

Second protrusion 135 of second seat portion 120

Internal teeth 136 of support 121

Inner gear ring 136 'of safety belt hook 130'

Mounting part 131, 131' limit projection 137

Outer rim 138 central through hole 171

Coupling portion 140 mounting ribs 172

Gear fixing recess 1401 sun wheel 173

Planetary 174 of joint 150, 170

Gear 151 pin 175

Gear fixing boss 1511 seat portion 18

Driven wheel 152 mounting seat 181

Positioning projection 182 of accommodating groove 153

Fixed column 154 soft cloth 191

The receiving space 161 positions the webbing 192

Hanging belt 193 of instruction book 162

Limiting block 163

Detailed Description

Several different preferred embodiments of the present invention will now be described with reference to the drawings, wherein like reference numerals represent like parts in the various figures. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1-2, the child growth device 100 of the present invention includes a first seat portion 110 and a second seat portion 120 pivotally connected to each other, the first seat portion 110 has a cavity 111, when the child growth device is folded, at least a portion of the second seat portion 120 is received in the cavity 111, when the child growth device is unfolded, the second seat portion 120 and the first seat portion 110 are coplanar to form a seat portion 18, and a safety belt hook 130 is installed on a side surface of the seat portion 18.

Specifically, as shown in fig. 1 and 2, the rear end of the first seat portion 110 and the front end of the second seat portion 120 are pivotally connected by a pivot, and in the unfolded state, the top surface of the first seat portion 110 and the top surface of the second seat portion 120 form the seat portion 18 for the child to seat. In order to ensure the ventilation of the seat portion 18, a plurality of rows of ventilation holes are formed on the top surface of the first seat portion 110 and the top surface of the second seat portion 120. In one embodiment, a supporting member 121 is optionally disposed on the bottom surface of the second seat portion 120, and the supporting member 121 can be made of soft material to increase the comfort of the seat, as shown in fig. 2 and 5.

As shown in fig. 1 and 2, the seat belt hook 130 is rotatably provided on the side of the joint of the first seat portion 110 and the second seat portion 120, i.e., the side of the seat portion 18. The seat belt hooks 130 are vertically positioned on both sides of the seat portion 18 when the seat is in the user's state, and the seat belt hooks 130 are rotated to the horizontal position without protruding from the top surface of the seat portion 18 when the seat is in the folded state. Specifically, the seat belt hook 130 may be pivotally connected to a side surface of the seat 18 by a pivot shaft between the first seat portion 110 and the second seat portion 120, or may be pivotally connected to a side surface of the seat 18 by another pivot pin.

Specifically, in the first embodiment, as shown in fig. 3, a mounting seat 181 is provided on a side surface of the seat portion 18 for mounting the seat belt hook 130, and a mounting hole is opened in the middle of the mounting seat 181 for passing through a rotating shaft or a rotating pin. The side of the seat portion 18 is further provided with a positioning protrusion 182, the positioning protrusion 182 is adjacent to the mounting seat 181, and optionally, the positioning protrusion 182 is a rib shape, and the extending direction of the positioning protrusion is a vertical direction. As shown in fig. 4, the belt hook 130 includes a mounting portion 131 and a hook portion 132, a positioning recess 133 is provided on the mounting portion 131 at a position corresponding to the positioning projection 182, and specifically, the positioning recess 133 is formed by a first projection 134 and a second projection 135 provided on the mounting portion 131. Specifically, the first and

second protrusions

134 and 135 extend in a horizontal direction. When the positioning protrusion 182 is caught on the positioning recess 133, the first protrusion 134 and the second protrusion 135 are located at the left and right sides of the positioning protrusion 182, respectively. Specifically, the height of the first protrusion 134 is slightly shorter than the height of the second protrusion 135. When the seat belt hook 130 needs to be rotated and folded, the force is required to overcome the force of the first protrusion 134 on the positioning protrusion 182, so that the positioning protrusion 182 can be separated from the positioning recess 133 to rotate. The second protrusion 135 functions to prevent the belt hook 130 from being excessively rotated backward in the use state.

The use and collapsing process of the child growth apparatus 100 of the present invention will be described with reference to fig. 1-6. When the seat 100 is in the use state, the first seat portion 110 and the second seat portion 120 are unfolded to form the seat portion 18, the seat belt hook 130 is vertically positioned at both sides of the seat portion 18 and protrudes from the seat portion 18, and at this time, the positioning protrusion 182 of the seat portion 18 is clamped on the positioning recess 133 of the seat belt hook 130 to maintain the stable clamping state, as shown in fig. 1. When the seat 100 is not in use and needs to be folded, the second seat portion 120 rotates relative to the first seat portion 110 and is received in the cavity 111 of the first seat portion 110, and fig. 5 shows the folding process. Meanwhile, a rotational force may be applied to the belt hook 130 against the force of the first protrusion 134 of the belt hook 130 to the positioning protrusion 182, so that the positioning protrusion 182 is disengaged from the positioning recess 133, and the belt hook 130 may be rotated to a horizontal state, as shown in fig. 6. In this way, the second seat portion 120 is completely received by the first seat portion 110, and the harness hook 130 is horizontally received without protruding from the first and

second seat portions

110 and 120. Therefore, the folded seat 100 has a small size, thereby saving the storage space, and the seat belt hook 130 does not protrude out of the seat, thereby further reducing the size and increasing the safety factor.

Fig. 7-9 show other embodiments of the child growth device of the present invention, for example, the first seat portion 110 and the second seat portion 120 may be covered with a soft cloth 191 or a pad to increase the comfort or aesthetic feeling of the seat. In the stowed state, the positioning webbing 192 may be employed to bind the folded first seat portion 110 and the second seat portion 120; or in the storage state, the safety belt hook 130 is rotated to the vertical open state, and then a hanging belt 193 is connected for the user to move and carry.

Fig. 10-17b show a second embodiment of the child growth device 100' of the present invention, in which the specific connection between the seat belt hook 130 and the first and

second seat portions

110 and 120 is slightly different, and the first and

second seat portions

110 and 120 are also slightly different in configuration from the first embodiment. The same reference numerals as those in the first embodiment denote the same components, and the description of the same components will not be repeated in this embodiment, please refer to the related description of the first embodiment. As shown in fig. 10-12, the rear end of the first seat portion 110 is pivotally connected to the front end of the second seat portion 120 via a rotating shaft, and the seat belt hook 130 is rotatably connected to the side surface of the seat portion 18 via the rotating shaft. In this embodiment, the rear end of the first seat portion 110 is mounted at the front end of the second seat portion 120, and then the seat belt hook 130 is embedded at the rear end of the first seat portion 110, so that the seat belt hook 130 is also folded or unfolded in a linkage manner by folding or unfolding the second seat portion 120 relative to the first seat portion 110.

Specifically, as shown in fig. 13a, 13b and 14, the rear end of the first seat portion 110 is provided with an engaging portion 150 at a pivot joint for respectively connecting with the front end of the second seat portion 110 and the belt hook 130, the engaging portion 150 includes a central through hole (not shown), a gear 151 located at the central through hole and connected with the front end of the second seat portion, at least one receiving groove 153 located at the periphery of the gear 151, and at least one driven wheel 152 rotatable relative to the first seat portion, and an outer surface of the driven wheel 152 interferes with an outer surface of the gear 151. Preferably, the outer contour of the engaging portion 150 is circular, the gear 151 is located at the center, the number of the driven wheels 152 is two, and the centers of the two driven wheels 152 and the gear 151 are located substantially on the same straight line. The receiving groove 153 is annularly formed on the outer periphery of the first through hole 151. Preferably, the two receiving grooves 153 are respectively provided on the left and right sides of the corresponding positions of the two driven wheels 142. As shown in fig. 15, the end of the gear 151 is provided with a plurality of gear fixing protrusions 1511, the front end of the second seat portion 120 is provided with a connecting portion 140 at a pivot joint for fixing with the gear 151, the connecting portion 140 includes a plurality of gear fixing recesses 1401 (refer to fig. 14), and the gear 151 is fixed on the second seat portion 120 by the engagement of the gear fixing protrusions 1511 and the gear fixing recesses 1401. The driven wheel 152 is rotatably mounted to a fixed post 154 on the first seat portion 110 such that the driven wheel 152 is rotatable relative to the second seat portion 120. The interference between the driven wheel 152 and the gear 151 causes an increase in friction force when rotating.

As shown in fig. 16, the belt hook 130 is provided with a mounting portion 131 'that is in contact with the engagement portion 150, the mounting portion 131' also has a circular outer shape corresponding to the engagement portion 150, a side wall of the mounting portion 131 'is received in the receiving groove 153, and the side wall of the mounting portion 131' is provided with internal teeth 136 that interfere with the outer surface of the driven pulley 142 and an external ridge 138 that interferes with the peripheral wall of the engagement portion 150. That is, after the first seat portion 110, the second seat portion 120 and the seat belt hook 130 are connected, the outer circumference of the gear 151 interferes with the outer circumference of the driven pulley 152, and the outer circumference of the driven pulley 152 interferes with the inner teeth 136 of the seat belt hook 130, so that the rotational friction between the three is increased, and when the second seat portion 120 is folded or unfolded to drive the gear 151 to rotate, the seat belt hook 130 is also rotated in conjunction to fold or unfold under the sequential interference action of the driven pulley 152 and the inner teeth 136.

Two limit protrusions 137 are further provided on the side wall of the mounting portion 131', and the limit protrusions 137 are respectively received in the corresponding receiving grooves 153 and are movable in the receiving grooves 153. Specifically, the movement is represented by a rotation of the seat belt hook 130 relative to the seat portion 18, preferably within 90 degrees, not exceeding 90 degrees. I.e., the operator may manually rotate the harness hook 130 to a desired position.

As shown in fig. 17a and 17b, the second seat portion 120 may be provided with a specification accommodating space 161 for accommodating a specification 162 of the seat, for example, two limiting blocks 163 are provided at opposite ends of the lower surface of the cover of the second seat portion 120, and the specification 162 is placed thereon and supported by the two limiting blocks 163.

Fig. 18-20 illustrate a third embodiment of the child growth device 100 "of the present invention, in which the particular connection between the harness hook 130 and the first and

second seat portions

110, 120 is slightly different than the second embodiment. The same reference numerals as those in the above embodiments denote the same components, and the description of the same components in this embodiment will not be repeated, so that reference is made to the related description of the above embodiments. The rear end of the first seat portion 110 is pivotally connected to the front end of the second seat portion 120 through a rotating shaft, the seat belt hook 130 is rotatably connected to the side surface of the seat portion 18 through the rotating shaft, and the seat belt hook 130 is also folded or unfolded in a linkage manner through folding or unfolding of the second seat portion 120 relative to the first seat portion 110.

As shown in fig. 18 and 19, the rear end of the first seat portion 110 is provided with a joint portion 170 at a pivot joint, a sun gear 173 mounted on the joint portion 170 and connected to the front end of the second seat portion 120, and planet gears 174 mounted on the joint portion 170 and meshed with the sun gear 173. Specifically, the joint portion 170 has a central through hole 171, and the sun gear 173 passes through the central through hole 171 and is mounted on the second seat portion 120 by a pin 175. The joint 170 is provided with a mounting rib 172 around the central through hole 171, and the planetary gear 174 is mounted on the joint 170 by the mounting rib 172. Preferably, the plurality of planet gears 174 are evenly distributed around the sun gear 173 in meshing engagement therewith. In the present embodiment, the number of the planet wheels 174 is 3, but in other embodiments, the number of the planet wheels 174 may be other, for example, 6; the number is not limited.

As shown in fig. 20, the belt hook 130 is provided with a mounting portion 131 ″ connected to the joint portion 170, and the mounting portion 131 ″ is provided with an inner gear 136 ', and the inner gear 136' is engaged with the planetary gear 174 after the mounting portion 131 ″ is mounted to the joint portion 170 by the pin 175. That is, when the first seat portion 110, the second seat portion 120 and the seat belt hook 130 are connected, the outer circumference of the sun gear 17 is engaged with the outer circumference of the planetary gear 173, and the outer circumference of the planetary gear 174 is engaged with the inner gear 136' of the seat belt hook 130, so that the three portions can be interlocked. When the second seat portion 120 is folded or unfolded relative to the first seat portion 110 to rotate the sun gear 173, the seat belt hook 130 is also rotated in conjunction with the planetary gear 174 and the ring gear 136' to fold or unfold.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims

1. A child growth device, comprising: the child growth device comprises a first seat part and a second seat part which are pivoted with each other, wherein the first seat part is provided with a cavity, and at least one part of the second seat part is contained in the cavity when the child growth device is folded; when the child growth device is unfolded, the second seat part and the first seat part are coplanar to form a seat part, and a safety belt hook is arranged on the side surface of the seat part; the rear end of the first seat part is pivoted with the front end of the second seat part through a rotating shaft, and the safety belt hook is rotatably connected to the side surface of the seat part through the rotating shaft; the rear end of the first seat part is provided with a joint part at a pivot joint, the joint part comprises a central through hole, a gear which is positioned at the central through hole and is connected with the front end of the second seat part, at least one accommodating groove which is positioned at the periphery of the gear, and at least one driven wheel which can rotate relative to the first seat part, and the outer surface of the driven wheel is interfered with the outer surface of the gear; the safety belt hook is provided with an installation part connected with the joint part, the side wall of the installation part is contained in the containing groove, and the side wall of the installation part is provided with internal teeth interfering with the outer surface of the driven wheel.

2. A child growth device as claimed in claim 1, wherein: and a mounting seat is arranged on the side surface of the seat part to mount the safety belt hook, and the mounting seat is connected with the safety belt hook through a rotating pin.

3. A child growth device as claimed in claim 1, wherein: the seat part is provided with a positioning protrusion on the side surface, and the safety belt hook is provided with a positioning groove for clamping the positioning protrusion.

4. A child growth device as claimed in claim 3, wherein: the safety belt hook is provided with a first convex part and a second convex part, and the positioning concave part is formed between the first convex part and the second convex part.

5. A child growth apparatus according to claim 4, wherein: the extending direction of the first convex part and the second convex part is perpendicular to the extending direction of the positioning convex part.

6. A child growth device as claimed in claim 1, wherein: and a support piece is arranged on the bottom surface of the second seat part and is made of a soft material.

7. A child growth device as claimed in claim 1, wherein: the first seat portion and the second seat portion are covered with soft cloth.

8. A child growth device as claimed in claim 1, wherein: further comprising positioning webbing to bind the first seat portion and the second seat portion in a folded condition.

9. A child growth device as claimed in claim 1, wherein: the top surfaces of the first seat part and the second seat part are provided with a plurality of air holes.

10. A child growth device as claimed in claim 1, wherein: and a connecting part fixedly connected with the gear is arranged at the pivot joint of the front end of the second seat part.

11. A child growth device as claimed in claim 1, wherein: the installation part is provided with at least one limiting protrusion, and the limiting protrusion is movably accommodated in the accommodating groove.

12. A child growth device as claimed in claim 11, wherein: the moving track of the limiting protrusion in the accommodating groove is arc-shaped, and the moving angle range is not more than 90 degrees.

13. A child growth device as claimed in claim 10, wherein: the connecting part comprises a gear fixing concave, and a gear fixing convex matched with the gear fixing concave is arranged at the end part of the gear.

14. A child growth device, comprising: the rear end of the first seat part is pivoted with the front end of the second seat part through a rotating shaft; when the child growth device is unfolded, the second seat part and the first seat part are coplanar to form a seat part, and a safety belt hook is mounted on the side surface of the seat part and is rotatably connected to the side surface of the seat part through the rotating shaft and is linked with the rotating shaft between the second seat part and the first seat part; wherein, the rear end of first seat portion is equipped with a joint portion in pin joint department, the joint portion includes central through-hole, is located central through-hole department and with the gear that the front end of second seat portion links to each other, be located at least accepting groove of gear periphery, can be relative first seat portion pivoted is at least from the driving wheel, the interlock by from the driving wheel the surface with interference between the surface of gear reaches, be equipped with on the safety belt hook with an installation department that the joint portion meets, the boundary wall of installation department is accepted in the accepting groove, just be equipped with on the boundary wall of installation department with the internal tooth that interferes mutually from the surface of driving wheel.

15. A child growth device, comprising: the rear end of the first seat part is pivoted with the front end of the second seat part through a rotating shaft; when the child growth device is unfolded, the second seat part and the first seat part are coplanar to form a seat part, and a safety belt hook is mounted on the side surface of the seat part and is rotatably connected to the side surface of the seat part through the rotating shaft and is linked with the rotating shaft between the second seat part and the first seat part; the rear end of the first seat part is provided with a joint part at a pivot joint, a sun wheel which is arranged on the joint part and connected with the front end of the second seat part, and a plurality of planet wheels which are arranged on the joint part and meshed with the sun wheel; the safety belt hook is provided with an installation part connected with the joint part, and the installation part is provided with an inner gear ring meshed with the planet gear.

16. A child growth device as claimed in claim 15, wherein: the joint part is provided with a mounting convex edge, and the planet wheel is mounted on the mounting convex edge.

17. A child growth device as claimed in claim 15, wherein: the planet wheels are uniformly arranged on the periphery of the sun wheel.