Child safety seat

Abstract

This invention provides a child safety seat. The child safety seat includes a seat belt limiting device and a seat body. The seat body is provided with a connector. The seat belt limiting device has a first end and a second end opposite to each other, a first engagement portion is provided at the first end, and a second engagement portion is provided at the second end. The seat belt limiting device is adapted to be detachably engaged with a vehicle seat belt via the first engagement portion to apply a downward traction force to the vehicle seat belt. The second engagement portion is adapted to be detachably engaged with the connector.

Description

Child safety seat The present invention relates to a child safety seat. When in use, the vehicle seat belt is detachably connected to the buckle on the seat through a buckle. The buckle divides the vehicle seat belt into a shoulder belt part and a waist belt part. The shoulder belt part diagonally crosses the chest and one shoulder of the passenger, and the waist belt part horizontally crosses the waist of the passenger. After a child reaches a certain age and height, the child sitting in the child safety seat can be fixed by the vehicle seat belt. On the one hand, the vehicle seat belt fixes the child in the child safety seat, and on the other hand, it fixes the child safety seat on the vehicle seat. Since the size of the vehicle seat belt is designed based on the physical conditions of adults, although the child safety seat can raise the child sitting in it to adapt to the size of the vehicle seat belt, the vehicle seat belt may still cause harm to the child during use. For example, when the vehicle is impacted, the shoulder belt part binding on the child (especially a relatively thin child) is more likely to slide upward, which may cause harm to the child's neck and face. The present invention aims to provide a child safety seat to solve the above problems existing in the prior art child safety seats during use. The present invention provides a child safety seat, including a seat belt limiting device and a seat body. The seat body is provided with a connector. The seat belt limiting device has a first end and a second end opposite to each other. A first engaging portion is provided at the first end, and a second engaging portion is provided at the second end. The seat belt limiting device is adapted to be detachably engaged with the vehicle seat belt through the first engaging portion to apply a downward pulling force to the vehicle seat belt, and the second engaging portion is adapted to be detachably engaged with the connector. In the above first aspect, the seat belt limiting device is adapted to be detachably engaged with at least one of the shoulder belt part and the waist belt part of the vehicle seat belt through the first engaging portion to apply a downward pulling force to the vehicle seat belt. In the above first aspect, the seat body includes a seat part and a backrest part. The seat part is provided with a crotch belt mounting part; the seat body further includes a crotch belt connected to the crotch belt mounting part, and a first buckle serving as the connector is installed at the end of the crotch belt. In the first aspect described above, the seat body is configured with a first shoulder strap and a second shoulder strap. The first shoulder strap is configured with a first sub - buckle, and the second shoulder strap is configured with a second sub - buckle. The first sub - buckle and the second sub - buckle are adapted to be detachably snapped onto the first buckle; on both sides of the backrest portion, a first receiving groove and a second receiving groove are provided; when the first sub - buckle and the second sub - buckle are snapped onto the first buckle, the seat belt limiting device is adapted to be placed in either the first receiving groove or the second receiving groove; when the second engaging portion of the seat belt limiting device engages with the first buckle, the first sub - buckle is adapted to be placed in the first receiving groove, and the second sub - buckle is adapted to be placed in the second receiving groove. In the first aspect described above, the seat belt limiting device is an integrally formed part. In the first aspect described above, the child safety seat is configured with a storage structure. When the seat belt limiting device is detached from the connector via the second engaging portion, the seat belt limiting device is adapted to be accommodated in the storage structure. In the first aspect described above, the storage structure includes a groove provided in front of the seat portion or the backrest portion of the seat body. In the first aspect described above, the seat body includes a seat portion and a backrest portion. A crotch belt mounting portion is provided in the middle of the seat portion; the seat body further includes a crotch belt and a crotch belt guard connected to the crotch belt mounting portion, and the crotch belt guard includes a connecting portion serving as the connector. In the first aspect described above, the second engaging portion is selected from at least one of the following: magic tape, zipper, magnetic part, snap button, button, and the connecting portion has a connector made of the same material as the second engaging portion and is mutually配合. In the first aspect described above, a limiting belt extending transversely is provided on the crotch belt guard. Both ends of the limiting belt are connected to both sides of the crotch belt guard in the transverse direction, and the crotch belt passes through between the limiting belt and the crotch belt guard. In the first aspect described above, the child safety seat further includes a clamping plate. A slot is provided in the middle of the clamping plate, and clamping holes are formed on the wall of the slot; the connecting portion includes two positioning sleeves spaced apart on the back side of the crotch belt guard. Both ends of the clamping plate are adapted to be inserted into the two positioning sleeves, and the slot is located between the two positioning sleeves; the second engaging portion includes an elastic arm and a clamping block provided on the elastic arm. The elastic arm is adapted to be inserted into the slot, and the clamping block is adapted to be clamped with the clamping hole. In the above first aspect, the connecting portion includes a receiving recess located inside the crotch belt flap, the receiving recess having an open top; the seat belt limiting device includes an integrally formed main body, the second engaging portion includes two lugs extending laterally in opposite directions from the main body, the width at the two lugs being greater than the width of the open top, and the two lugs being adapted to obliquely enter the receiving recess through the open top. The child safety seat provided by the present invention is configured with a seat belt limiting device. The seat belt limiting device is detachably engaged with the vehicle seat belt through a first engaging portion and can apply a downward pulling force to the vehicle seat belt, thereby restricting the upward slippage of the vehicle seat belt when the vehicle is impacted, and thus avoiding damage to the neck and face of the child caused by the vehicle seat belt, and improving the riding safety of the child. FIG. 1 shows a child safety seat 1000 (hereinafter also simply referred to as seat 1000) provided by a first embodiment of the present invention. As shown in the figure, the child safety seat 1000 includes a seat belt limiting device 100 and a seat body 200. Referring to FIG. 1, the seat body 200 may include a seat portion 21 and a backrest portion 22. The seat portion 21 has side portions 211 located on the left and right sides, and the backrest portion 22 has side portions (also referred to as side wings) 221 located on the left and right sides. In this embodiment, the side portions 211 on both sides of the seat portion 21 and the side portions 221 on both sides of the backrest portion 22 are also collectively referred to as the side portions 202 of the seat body 200. Preferably, the side portions 211 on both sides of the seat portion 21 can be turned up relative to the middle of the seat portion 21, and the side portions 221 on both sides of the backrest portion 22 can be turned forward relative to the middle of the backrest portion 22. This structure of the seat portion 21 and the backrest portion 22 can better fix the child in the seat 1000. Referring to FIG. 1, the seat belt limiting device 100 can be directly or indirectly attached to any suitable position of the seat body 200. In this embodiment, the seat belt limiting device 100 can be attached to the side portion 202 of the seat body 200. More specifically, the seat belt limiting device 100 is attached to one side portion 221 of the backrest portion 22. The seat belt limiting device 100 includes a first engaging portion 11. The seat belt limiting device 100 is adapted to be detachably engaged with the middle and lower sections of the shoulder belt portion 31 of the vehicle seat belt through the first engaging portion 11 to apply a downward pulling force to the shoulder belt portion 31. Combining with the related art, it can be known that the vehicle seat belt has a buckle 27, and the buckle 27 is used to be clamped with the buckle on the vehicle seat and divide the vehicle seat belt into a shoulder belt portion 31 and a waist belt portion 32. The shoulder belt portion 31 obliquely crosses the chest and one shoulder of the child, and the waist belt portion 32 crosses the waist of the child, thereby fixing the child in the seat 1000 and fixing the seat 1000 on the vehicle seat. Regarding the protective function of the child safety seat in this embodiment, when the vehicle is impacted, the seat belt limiting device 100 pulls the shoulder strap portion 31, applying a force to the shoulder strap portion 31 to approach the waist strap portion 32, thereby restricting the upward slippage of the upper section of the shoulder strap portion 31 and avoiding damage to the neck and face of the child by the shoulder strap portion 31, improving the riding safety of the child. It should be noted that in each embodiment of the present invention, the seat belt limiting device 100 applies a downward pulling force to the shoulder strap portion 31, and the direction of this pulling force is not limited to the vertically downward direction. For example, when the direction of the pulling force is obliquely downward, it is also within the protection scope of the present invention. In this embodiment, the seat belt limiting device 100 is used to apply an obliquely downward pull to the shoulder strap portion 31 to keep the shoulder strap portion 31 away from the neck and face of the child. It should be noted that the seat belt limiting device 100 can also be detachably engaged with the shoulder strap portion 31 and the waist strap portion 32 of the vehicle seat belt through the first engaging portion 11 to simultaneously apply a downward pulling force to the shoulder strap portion 31 and the waist strap portion 32. Referring to FIGS. 1 to 3, the seat belt limiting device 100 in this embodiment can be detachably engaged with the shoulder strap portion 31 through the first engaging portion 11, without affecting the removal of the seat 1000 from the vehicle. When the seat 1000 is removed from the vehicle seat, the vehicle seat belt can be used for fixing an adult. The preferred embodiment of the first engaging portion 11 is shown in this embodiment. The first engaging portion 11 is, for example, a U-shaped buckle, and the buckle can be hung upside down on the shoulder strap portion 31 to engage with the shoulder strap portion 31. The engagement and disassembly operations of the buckle with the shoulder strap portion 31 are very simple, and no adaptive changes need to be made to the structure of the shoulder strap portion 31. It should be understood that the implementation manner of the first engaging portion 11 is not limited to the buckle, as long as it can achieve detachable engagement with the shoulder strap portion 31 and facilitate the seat belt limiting device 100 to apply a downward pulling force to the shoulder strap portion 31. For example, in some embodiments not shown, the first engaging portion 11 is an openable and closable annular sleeve, and the shoulder strap portion 31 can pass through the annular sleeve. The annular sleeve is made of, for example, metal, plastic, or fabric. When the annular sleeve is made of fabric, the closure of the annular sleeve can be achieved by buttons, magnetic buttons, Japanese character buttons, zippers, etc. Referring to FIG. 1, the seat belt limiting device 100 in this embodiment is detachably connected to the seat body 200. In this way, the seat belt limiting device 100 can be installed on the seat body 200 or removed from the seat body 200 as needed. The seat belt limiting device 100 of this embodiment may include a first traction belt 41. The buckle serving as the first engaging portion 11 is connected to the first traction belt 41, and the first traction belt 41 is also provided with a second engaging portion 12. A connector 5 is provided on the side portion 221 of the backrest portion 22, and the connector 5 is detachably connected to the second engaging portion 12. For example, one of the second engaging portion 12 and the connector 5 is a male plug, and the other is a female socket matching the male plug. The connector 5 can be installed, for example, below the side portion 221 of the backrest portion 22 through a webbing 51. Preferably, the first traction belt 41 has an adjustable length. The first traction belt 41 adjusted to an appropriate length can form a stable included angle with the shoulder strap portion 31 to ensure the traction effect of the seat belt limiting device 100 on the shoulder strap portion 31. For example, when a child is sitting on the seat 100 and the vehicle seat belt and the seat belt limiting device 100 are in use, the first engaging portion 11 is engaged with the shoulder strap portion 31, the first traction belt 41 is tensioned, and an upper included angle a is formed between the upper portion of the shoulder strap portion 31 and the tensioned first traction belt 41. The angle range of the upper included angle a can be, for example, between 60 degrees and 120 degrees, wherein the angle of the upper included angle a can be equal to 60 degrees or equal to 120 degrees. Preferably, the angle of the upper included angle a is 90 degrees. In this way, the first traction belt 41 can better traction the shoulder strap portion 31 and prevent the shoulder strap portion 31 from slipping upward. Referring to FIG. 2, preferably, the buckle is provided with a through hole 101, and the first end of the first traction belt 41 passes through the through hole 101 and then forms an annular structure 410 by sewing. Referring to FIG. 1, the second engaging portion 12 may be a male plug including a Japanese character buckle portion. The first traction belt 41 passes through the Japanese character buckle portion of the male plug, and the length of the first traction belt 41 can be conveniently adjusted by moving the first traction belt 41 relative to the Japanese character buckle portion. It should be understood that the adjustable length of the first traction belt 41 in this embodiment is the length of the portion of the first traction belt 41 located between the first engaging portion 11 and the second engaging portion 12. Referring to FIG. 1, in this embodiment, the connecting member 5 is disposed at the bottom of the side portion 221 of the backrest portion 22, near the opening through which the waist belt portion 32 passes in the side portion 221. Of course, in other embodiments, the connecting member 5 may be disposed at the connection between the side portion 211 of the seat portion 21 and the side portion 221 of the backrest portion 22, or disposed on the inner and outer sides of the side portion 221 of the backrest portion 22, etc. Additionally, preferably in this embodiment, the seat body 200 is configured with a first storage bag 203, and the first storage bag 203 may be a cloth bag or an elastic sleeve connected to the seat cloth of the seat body 200. After the connecting member 5 is separated from the second engaging portion 12, the connecting member 5 can be stored in the first storage bag 203 and hidden. According to the installation position of the connecting member 5 on the seat body 200, the first storage bag 203 can be correspondingly disposed at a suitable position on the seat body 200. Referring to FIG. 1, although in this embodiment, the connecting member 5 is only shown on the side portion 202 on one side of the seat body 200, in other embodiments, the connecting members 5 can be disposed on the side portions 202 on both sides of the seat body 200, and the second engaging portion 12 of the seat belt limiting device 100 can be selectively and detachably connected to the connecting member 5 on any one side of the side portion 202. In this way, regardless of whether the seat 1000 is installed on the left or right side of the vehicle rear row, the seat belt limiting device 100 can be connected between the shoulder strap portion 31 and the corresponding connecting member 5 to apply a downward traction force to the shoulder strap portion 31, making the shoulder strap portion 31 close to the waist belt portion 32 and preventing the shoulder strap portion 31 from sliding upward. FIG. 4 shows a seat 1000 provided by the second embodiment of the present invention. The seat 1000 includes a seat belt limiting device 100 and a seat body 200. The seat body 200 includes a seat portion 21 and a backrest portion 22. Without conflict, the structure of the seat body 200 can refer to the description in the above-mentioned first embodiment. As shown in FIG. 4, the seat belt limiting device 100 includes a first engaging portion 11 and a second traction belt 42. The first engaging portion 11 is connected to the second traction belt 42. The structure of the first engaging portion 11 and its connection relationship with the second traction belt 42 can refer to the structure of the first engaging portion 11 and its connection relationship with the first traction belt 41 in the above-mentioned first embodiment, which will not be elaborated here. This embodiment is a variant of the above-mentioned first embodiment. The main difference between this embodiment and the above-mentioned first embodiment is that the second traction belt 42 is fixedly connected to the side portion 202 of the seat body 200. More specifically, the second end of the second traction belt 42 is fixedly connected to the seat fabric of the side portion 221 of the backrest portion 22 by sewing. Compared with the above-mentioned first embodiment, this embodiment can omit the second engaging portion 12 and the connecting member 5. The seat belt limiting device 100 can still apply a downward pulling force to the shoulder belt portion 31, so that the shoulder belt portion 31 is close to the waist belt portion 32, thereby avoiding the upward slippage of the shoulder belt portion 31. In some embodiments not shown, for example, a D-ring portion can be provided on the buckle serving as the first engaging portion 11, and the first end of the second traction belt 42 passes through the D-ring portion. In this way, by moving the second traction belt 42 relative to the D-ring portion, the length of the second traction belt 42 can be conveniently adjusted. Preferably, when the vehicle seat belt and the seat belt limiting device 100 are in use, an upper included angle a as described in the first embodiment can be formed between the upper part of the shoulder belt portion 31 and the second traction belt 42. The angle range of the upper included angle a can be, for example, between 60 degrees and 120 degrees. In addition, although only one seat belt limiting device 100 is shown on the side portion 202 of one side of the seat body 200 in this embodiment, in other embodiments, the seat body 200 can be configured with two seat belt limiting devices 100. The second traction belts 42 of the two seat belt limiting devices 100 are respectively fixedly connected to the side portions 202 on both sides of the seat body 200. The first engaging portions 11 on the second traction belts 42 of the two seat belt limiting devices 100 are selectively engaged with the shoulder belt portion 31. In this way, no matter whether the seat 1000 is installed on the left or right side of the rear row of the vehicle, it can be ensured that one seat belt limiting device 100 is suitable for applying a downward pulling force to the shoulder belt portion 31, so that the shoulder belt portion 31 is close to the waist belt portion 32 and the upward sliding of the shoulder belt portion 31 is avoided. FIG. 5 shows a seat 1000 provided by the third embodiment of the present invention, which includes a seat belt limiting device 100 and a seat body 200. The seat body 200 includes a seat portion 21 and a backrest portion 22. Without conflict, the structure of the seat body 200 can refer to the description in the above first embodiment. The seat belt limiting device 100 is attached to the seat body 200 and detachably engages with the shoulder belt portion 31 of the vehicle seat belt through a first engaging portion 11 to apply a downward pulling force to the shoulder belt portion 31, so that the shoulder belt portion 31 is close to the waist belt portion 32, avoiding the upward slippage of the shoulder belt portion 31. The main difference between this embodiment and the above embodiments lies in the installation position of the seat belt limiting device 100. Referring to FIG. 5, a crotch belt mounting portion 210 is provided in the middle of the seat portion 21. The crotch belt mounting portion 210 is, for example, a portion provided by the surface of the seat portion 21 for connecting the crotch belt. The seat belt limiting device 100 and the crotch belt mounting portion 210 can be fixedly or detachably connected together. Preferably, the seat belt limiting device 100 may further include a third traction belt 43. The first engaging portion 11 is connected to the third traction belt 43, and the third traction belt 43 and the crotch belt mounting portion 210 can be connected together by sewing, for example. The seat belt limiting device 100 with this structure can also function as a crotch belt while applying a downward pulling force to the shoulder belt portion 31. In some embodiments, a crotch belt may be additionally configured at the crotch belt mounting portion 210. According to related technologies, the crotch belt can be snapped with two sub-buckles on the two shoulder belts自带 by the seat 1000. When fixing a child to the seat 1000 using the crotch belt and the shoulder belt, the vehicle seat belt is in an idle state. At this time, the seat belt limiting device 100 can be hidden in the storage structure on the seat portion 21. When fixing a child to the seat 1000 using the vehicle seat belt, the seat belt limiting device 100 can be taken out from the storage structure to engage with the shoulder belt portion 31, and the crotch belt is in an idle state. At this time, the crotch belt can be hidden in the storage structure. Referring to FIG. 5, the structure of the first engaging portion 11 in this embodiment and its connection relationship with the third traction belt 43 can refer to the structure of the first engaging portion 11 and its connection relationship with the first traction belt 41 in the above first embodiment, and will not be elaborated here. In some embodiments not shown, the third traction belt 43 has an adjustable length. For example, a Japanese character buckle portion can be provided on the buckle serving as the first engaging portion 11, and the end of the third traction belt 43 passes through the Japanese character buckle portion. By moving the third traction belt 43 relative to the Japanese character buckle portion, the length of the third traction belt 43 can be conveniently adjusted. FIG. 6 shows a seat 1000 provided by the fourth embodiment of the present invention, which is a variant of the above third embodiment. The following mainly describes the differences between this embodiment and the above third embodiment, and the same or similar parts between this embodiment and the above third embodiment will not be elaborated in detail. Referring to FIG. 6, in this embodiment, the crotch strap 23 of the seat 1000 extends from the crotch strap mounting portion 210, and a first buckle 231 is installed at the end of the crotch strap 23. The seat belt limiting device 100 is detachably connected to the first buckle 231 of the crotch strap 23. In this way, the seat belt limiting device 100 can utilize the length of the crotch strap 23, and the length of the seat belt limiting device 100 itself can be significantly shortened. Preferably, the seat belt limiting device 100 may include a fourth traction belt 44. The first engaging portion 11 is connected to the fourth traction belt 44, and a second buckle 442 is also installed on the fourth traction belt 44. The first buckle 231 and the second buckle 442 are detachably snapped together. The first buckle 231 can be a female buckle, and the second buckle 442 can be a male buckle. When using the vehicle seat belt to fix the child in the seat 1000, first snap the first buckle 231 and the second buckle 442 together, and then engage the first engaging portion 11 with the shoulder strap portion 31. The seat belt limiting device 100 can apply a downward pulling force to the shoulder strap portion 31, causing the shoulder strap portion 31 to approach the waist strap portion 32 and preventing the shoulder strap portion 31 from slipping upward. When using the child shoulder strap自带的儿童肩带固定儿童时,在解除第一扣具231和第二扣具442的卡接关系之后,第一扣具231即可与儿童肩带的子扣卡合。 Referring to FIG. 6, in this embodiment, the fourth traction belt 44 can pass through the D-ring 45, and by moving the fourth traction belt 44 relative to the D-ring 45, the length of the fourth traction belt 44 can be conveniently adjusted. FIGS. 7 to 10 illustrate the seat 1000 provided according to the fifth embodiment of the present invention. The seat cloth of the seat 1000 is not shown in FIGS. 7 and 10. This embodiment is a modification of the above fourth embodiment. The differences between this embodiment and the above fourth embodiment will be mainly described below, and the same or similar parts between this embodiment and the above fourth embodiment will not be elaborated in detail. Referring to FIGS. 8 and 9, in the seat 1000 provided by the fifth embodiment of the present invention, the seat belt limiting device 100 is an integrally formed part, which is integrally formed by injection molding, for example. The first engaging portion 11 is located at the first end of the seat belt limiting device 100, and the first engaging portion 11 is, for example, a hanging buckle with a U-shaped cross section. The second end of the seat belt limiting device 100 has a third buckle 14, and the third buckle 14 is used for detachably snapping with the first buckle 231. Referring to FIGS. 7 to 9, when the seat belt limiting device 100 in this embodiment is in use, its first engaging portion 11 can be hung upside down on the shoulder strap portion 31, and the third buckle 14 can be snapped with the first buckle 231 of the crotch strap 23, so as to apply a downward pulling force to the shoulder strap portion 31, causing the shoulder strap portion 31 to approach the waist strap portion 32 and preventing the shoulder strap portion 31 from slipping upward. The seat belt limiting device 100 of this embodiment does not need to be provided with a traction belt, and has the advantages of simple structure, easy manufacturing, convenient disassembly and assembly, etc. The seat belt limiting device 100 has a relatively small volume and is also easy to store after being disassembled. Referring to FIG. 10, the first engaging portion 11 of the seat belt limiting device 100 provided in this embodiment can also be hung on the shoulder belt portion 31 and the waist belt portion 32 at the same time, so that the middle part of the shoulder belt portion 31 is directly attached to the middle part of the waist belt portion 32. When the seat 1000 is in use, the seat belt limiting device 100 can apply a downward pulling force to the shoulder belt portion 31 and the waist belt portion 32 at the same time, which can not only prevent the shoulder belt portion 31 from slipping upward, but also reduce the force on the child's abdomen. It should be understood that the buckle serving as the first engaging portion 11 can have a relatively large size so that its concave portion 110 can accommodate the shoulder belt portion 31 and the waist belt portion 32 at the same time. Preferably, the seat 1000 can also be configured with a storage structure, which can be provided in the seat portion 21, the backrest portion 22, or can be provided in the base of the seat 1000. After the seat belt limiting device 100 is removed from the crotch belt 23, it is suitable to be accommodated in the storage structure, which can effectively prevent loss. Referring to FIG. 11, the storage structure includes, for example, a groove 205 provided in the front of the seat portion 21 or the front of the backrest portion 22. A movable cover can be provided at the position of the seat cloth (not shown in the figure) of the seat body 200 corresponding to the groove 205. When the movable cover is opened, the seat belt limiting device 100 can be taken out of the groove 205 or the seat belt limiting device 100 can be put into the groove 205. When the movable cover is closed, the groove 205 can be covered, which will not affect the aesthetics of the seat cloth. In addition, in some embodiments, the groove 205 can be directly covered by the seat cloth, and the groove 205 can be exposed by lifting the seat cloth from the side, so as to facilitate the taking and placing of the seat belt limiting device 100. Preferably, a storage groove 213 suitable for storing the first buckle 231 can also be provided on the seat portion 21, and the storage groove 213 is provided close to the crotch belt mounting portion 210 to store the first buckle 231 nearby. FIGS. 12 and 13 illustrate a seat 1000 according to a sixth embodiment of the present invention. This embodiment is a modification of the above fifth embodiment. The differences between this embodiment and the above fifth embodiment will be mainly described below, and the same or similar parts of this embodiment and the above fifth embodiment will not be described in detail. Referring to FIGS. 12 and 13, for ease of explanation, the seat cloth is not shown in FIG. 12, and the seat cloth (not labeled in the figure) is shown in FIG. 13. The seat body 200 can be configured with a first shoulder strap (or the first child shoulder strap) 25 and a second shoulder strap (or the second child shoulder strap) 26. The first shoulder strap 25 is configured with a first sub - buckle 251, and the second shoulder strap 26 is configured with a second sub - buckle 261. The first sub - buckle 251 and the second sub - buckle 261 are adapted to be detachably clamped with the first buckle 231. On both sides of the backrest portion 22, a first receiving groove 225 and a second receiving groove 226 are provided. When the seat 1000 is in the first use mode, the seat 1000 fixes the child through the first shoulder strap 25 and the second shoulder strap 26. The seat belt limiting device 100 needs to be removed from the first buckle 231. The first sub - buckle 251 and the second sub - buckle 261 are simultaneously clamped with the first buckle 231. The removed seat belt limiting device 100 can be accommodated in the first receiving groove 225 or the second receiving groove 226 to prevent loss. When the seat 1000 is in the second use mode, the seat 1000 fixes the child through the vehicle seat belt. At this time, both the first sub - buckle 251 and the second sub - buckle 261 are released from the clamping with the first buckle 231. The seat belt limiting device 100 taken out from the first receiving groove 225 or the second receiving groove 226 is clamped with the first buckle 231. Then the first sub - buckle 251 can be placed in the first receiving groove 225, and the second sub - buckle 261 can be placed in the second receiving groove 226. The first receiving groove 225 and the second receiving groove 226 can be directly covered by the seat cloth, and the first receiving groove 225 and the second receiving groove 226 can be exposed by lifting the seat cloth from the side. In this embodiment, since one of the first sub - buckle 251 and the second sub - buckle 261 and the seat belt limiting device 100 are alternately stored in the same receiving groove, it can effectively prevent the user from misoperation in the two modes. That is, in the first use mode, before the user simultaneously clamps the first sub - buckle 251 and the second sub - buckle 261 with the first buckle 231, the user needs to first remove the seat belt limiting device 100 from the first buckle 231 and place it in the first receiving groove 225 or the second receiving groove 226. In the second use mode, the user needs to first take out the seat belt limiting device 100 from the first receiving groove 225 or the second receiving groove 226 and install it on the first buckle 231, and then the first sub - buckle 251 and the second sub - buckle 261 are respectively placed in the first receiving groove 225 and the second receiving groove 226. It should be noted that the first receiving groove 225 and the second receiving groove 226 of this embodiment are not only applicable to accommodating the seat belt limiting device 100 in the above - mentioned fifth embodiment, but also applicable to accommodating the seat belt limiting device 100 in the above - mentioned fourth embodiment. Referring to FIGS. 14 to 25, a seat 1000 provided according to the seventh embodiment of the present invention is illustrated. This embodiment is a variant of the above-mentioned sixth embodiment. The differences between this embodiment and the above-mentioned sixth embodiment will be mainly described below, and the same or similar parts between this embodiment and the above-mentioned sixth embodiment will not be elaborated here. Referring to FIG. 14, the seat body 200 includes a crotch belt 23 and a crotch belt guard 28 connected to the crotch belt mounting portion 210. A first buckle 231 is installed at the end of the crotch belt 23. As described above, the first buckle 231 is used to engage with the first sub-buckle 251 of the first shoulder belt 25 and the second sub-buckle 261 of the second shoulder belt 26. The crotch belt guard 28 is closer to the child sitting relative to the crotch belt 23. The bottom 281 of the crotch belt guard 28 can be connected to the seat cloth on the seat body 200 by sewing, for example, and the width of the crotch belt guard 28 is greater than the width of the crotch belt 23, so as to provide a sufficiently large contact area for the child. In order to limit the left and right sliding range of the crotch belt 23 relative to the crotch belt guard 28, a limiting belt 280 can be provided on the crotch belt guard 28. The left and right ends of the limiting belt 280 are connected to the left and right sides of the crotch belt guard 28, and the crotch belt 23 can pass through between the limiting belt 280 and the crotch belt guard 28. In this embodiment, the seat belt limiting device 100 is connected to the crotch belt guard 28, and its first engaging portion 11 can be a hanging buckle, for example, and can be hung upside down on the shoulder belt portion 31 (or, simultaneously hung upside down on the shoulder belt portion 31 and the waist belt portion 32) to apply a downward pulling force to at least the shoulder belt portion 31. Referring to FIGS. 15 and 16, an embodiment of the seat belt limiting device 100 is illustrated. The seat belt limiting device 100 can be an integrally formed metal part or plastic part. The first engaging portion 11 is located at the first end of the seat belt limiting device 100, and a third engaging portion 15 is provided at the second end of the seat belt limiting device 100. A connecting portion 282 is provided on the upper part of the crotch belt guard 28. The third engaging portion 15 and the connecting portion 282 can be fixed together by sewing or riveting, for example, so that the seat belt limiting device 100 is fixed to the crotch belt guard 28. Other connection methods of the seat belt limiting device 100 and the crotch belt guard 28 are illustrated in FIGS. 17 to 25. For the convenience of description, the crotch belt guard 28 in FIGS. 17 and 18 is illustrated in a rear view direction, and the seat belt limiting device 100 is illustrated in a front view direction. It can be seen from the figures that the seat belt limiting device 100 can include an integrally formed main body 100a. The main body 100a can be a metal part or plastic part. The first engaging portion 11 is located at the first end of the main body 100a and can be a hanging buckle, and the second end of the main body 100a has a third engaging portion 15. A connecting portion 282 is provided on the crotch belt guard 28, and the connecting portion 282 is detachably connected to the third engaging portion 15, so that the seat belt limiting device 100 is detachably connected to the crotch belt guard 28. In this way, when the seat belt limiting device 100 is not needed, the seat belt limiting device 100 can be removed from the crotch belt guard 28 and stored. There are many ways to detachably connect the connecting portion 282 and the third engaging portion 15. For example, referring to FIG. 17, the connecting portion 282 is located at the upper back side of the crotch belt guard 28, and the third engaging portion 15 and the connecting portion 282 can be Velcro that cooperate with each other. Or, referring to FIG. 18, the third engaging portion 15 and the connecting portion 282 can be zippers that cooperate with each other. Or, referring to FIG. 19, the third engaging portion 15 and the connecting portion 282 can be buttons and buttonholes that cooperate with each other. Or, referring to FIG. 20, the third engaging portion 15 and the connecting portion 282 can be magnetic attracting members that cooperate with each other. Or, in another way not shown, the third engaging portion 15 and the connecting portion 282 can be snap buttons that cooperate with each other. The third engaging portion 15 can be disposed at the second end of the main body 100a by any suitable means such as bonding, riveting, embedding, sewing, overmolding, etc. FIGS. 21 to 23 also illustrate another detachable connection manner between the seat belt limiting device 100 and the crotch belt guard 28. Referring to FIGS. 22 and 23, the child safety seat further includes a clamping plate 6, and the side profile of the clamping plate 6 is generally T-shaped, for example. A slot 60 is provided in the middle of the clamping plate 6, and a clamping hole 601 is formed on the wall of the slot 60. The connecting portion 282 of the crotch belt guard 28 includes two positioning sleeves 2821, 2822 spaced apart on the back side of the crotch belt guard 28. The two ends 61, 62 of the clamping plate 6 are adapted to be inserted into the two positioning sleeves, so that the slot 60 is located between the two positioning sleeves 2821, 2822, and the wall of the slot 60 can protrude outward relative to the two positioning sleeves 2821, 2822. The third engaging portion 15 at the second end of the main body 100a can include an elastic arm and a clamping block 150 provided on the elastic arm. The elastic arm is adapted to be inserted into the slot 60, and the clamping block 150 is adapted to be clamped with the clamping hole 601. Preferably, the elastic arm and the clamping block 150 are integrally formed with the main body 100a. FIGS. 24 and 25 illustrate another detachable connection manner between the seat belt limiting device 100 and the crotch belt guard 28. The connecting portion 282 of the crotch belt guard 28 includes a receiving recess 2823 located inside the crotch belt guard 28, and the receiving recess 2823 has a top opening 2820. The third engaging portion 15 at the second end of the main body 100a includes two lugs 151, 152 extending laterally from the main body 100a in opposite directions. The width W2 of the two lugs 151, 152 is greater than the width W1 of the top opening. The two lugs 151, 152 are adapted to enter the receiving recess 2823 obliquely through the top opening 2820. When the two lugs 151, 152 are both inside the receiving recess 2823 and are straightened, the seat belt limiting device 100 is not easily detached from the crotch belt guard 28. Preferably, the two lugs 151, 152 are integrally formed with the main body 100a. An embodiment of the present invention further provides a seat belt limiting device 100, which is used to be attached to the seat body 200 of a child safety seat. The seat belt limiting device 100 includes a first engaging portion 11. The seat belt limiting device 100 is adapted to be detachably engaged with the shoulder belt portion 31 of the vehicle seat belt through the first engaging portion 11 to apply a downward pulling force to the shoulder belt portion 31, so that the shoulder belt portion 31 approaches the waist belt portion 32 of the vehicle seat belt, and to prevent the shoulder belt portion 31 from slipping upward and hurting the child. In some embodiments, the seat belt limiting device 100 can be detachably engaged with both the shoulder belt portion 31 and the waist belt portion 32 of the vehicle seat belt through the first engaging portion 11 to apply a downward pulling force to both the shoulder belt portion 31 and the waist belt portion 32 simultaneously. The seat belt limiting device 100 can be as described in the foregoing first embodiment, and includes a first traction belt (traction belt) 41. The first engaging portion 11 is connected to one end of the first traction belt 41, and the other end of the first traction belt 41 is fixedly or detachably connected to the side portion of the seat body 200. When the first traction belt 41 is detachably connected to the side portion of the seat body 200, the other end of the first traction belt 41 can be provided with a second engaging portion 12, and the second engaging portion 12 is used to be detachably connected to the connector 5 on the side portion 202 of the seat body 200. The connector 5 on the side portion 202 of the seat body 200 can be provided with one or two according to needs. When two connectors 5 are provided, the two connectors 5 can be arranged on the two side portions of the seat body 200. Preferably, the first engaging portion 11 can be a buckle or a loop. The seat belt limiting device 100 can be as described in the foregoing second embodiment, and includes a second traction belt (traction belt) 42. The first engaging portion 11 is connected to one end of the second traction belt 42, and the other end of the second traction belt 42 is fixedly connected to the side portion of the seat body 200. The seat belt limiting device 100 can be provided with one or two according to needs. When two seat belt limiting devices 100 are provided, the second traction belts 42 of the two seat belt limiting devices 100 are respectively connected to the two side portions of the seat body 200. Preferably, the first engaging portion 11 can be a buckle or a loop. The seat belt limiting device 100 can be as described in the foregoing third embodiment, and includes a third traction belt (traction belt) 43. The first engaging portion 11 is connected to one end of the third traction belt 43, and the other end of the third traction belt 43 is connected to the crotch belt mounting portion 210 on the seat portion 21 of the child safety seat, for example, by sewing. Of course, in some embodiments, the other end of the third traction belt 43 can be detachably connected to the crotch belt mounting portion 210. Preferably, the first engaging portion 11 can be a buckle or a loop. The seat belt limiting device 100 may be as described in the foregoing fourth embodiment, and includes a fourth traction belt (traction belt) 44. The first engaging portion 11 is connected to the fourth traction belt 44. The fourth traction belt 44 is further provided with a second buckle 442, and the second buckle 442 is used for detachably connecting with the first buckle 231 on the crotch belt 23 of the child safety seat. Preferably, the first engaging portion 11 may be a buckle or a loop. Preferably, each of the foregoing traction belts (the first traction belt 41, the second traction belt 42, the third traction belt 43, and the fourth traction belt 44) has an adjustable length. Preferably, when a child is sitting in the child safety seat and the vehicle seat belt and the seat belt limiting device 100 are in use, the first engaging portion 11 engages with the shoulder belt portion 31, the traction belts (the first traction belt 41, the second traction belt 42, the third traction belt 43, and the fourth traction belt 44) are tensioned, and the shoulder belt portion 31 of the vehicle seat belt is pulled downward. An upper included angle (the upper included angle a in FIG. 1 can be referred to) is formed between the upper part of the shoulder belt portion 31 and the traction belts. The angle range of the upper included angle can be, for example, between 60 degrees and 120 degrees, wherein the angle of the upper included angle can be equal to 60 degrees or equal to 120 degrees. Preferably, the angle of the upper included angle is 90 degrees. The seat belt limiting device 100 may be as described in the foregoing fifth embodiment and is an integrally formed part. The first engaging portion 11 is located at the first end of the seat belt limiting device 100, and the first engaging portion 11 is, for example, a buckle. The second end of the seat belt limiting device 100 has a third buckle 14, and the third buckle 14 is used for detachably connecting with the first buckle 231 on the crotch belt 23 of the child safety seat. The seat belt limiting device 100 may be as described in the foregoing seventh embodiment and may include an integrally formed main body 100a. The main body 100a may be a metal part or a plastic part. The first engaging portion 11 is located at the first end of the main body 100a, and the first engaging portion 11 may be a buckle or a loop. Preferably, the first engaging portion 11 and the main body 100a are integrally formed and are a buckle. The second end of the main body 100a has a third engaging portion 15, and the third engaging portion 15 may have various implementation manners. It may be integrally formed with the main body 100a or disposed on the main body 100a in any suitable manner. The third engaging portion 15 is used for connecting with the crotch belt guard 28. For example, the third engaging portion 15 may be a magic tape. Or, the third engaging portion 15 may be a zipper. Or, the third engaging portion 15 may be a magnetic part. Or, the third engaging portion 15 may be a snap button. Or, the third engaging portion 15 may be a button. Or, the third engaging portion 15 may include an elastic arm and a block 150 provided on the elastic arm. Or, the third engaging portion 15 may include two lugs 151, 152 extending laterally in opposite directions. The seat belt limiting device 100 is used to be attached to the seat body 200, and at least applies a downward pulling force to the shoulder belt portion 31 of the vehicle seat belt, so that the shoulder belt portion 31 is close to the waist belt portion 32, thereby avoiding the upward movement of the shoulder belt portion 31 when the vehicle is impacted, and thus avoiding the shoulder belt portion 31 from causing harm to the neck and face of the child, improving the riding safety of the child. The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope of the present invention. The above-described embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims. 1000: Child safety seat 100: Seat belt limiting device 200: Seat body 202: Side part 21: Seat part 210: Hip belt mounting part 211: Side part 213: Storage groove 22: Backrest part 221: Side part 225: First accommodation groove 226: Second accommodation groove 11: First engagement part 12: Second engagement part 14: Third buckle 31: Shoulder belt part 32: Waist belt part 27: Buckle 41: First traction belt 410: Ring structure 42: Second traction belt 43: Third traction belt 44: Fourth traction belt 442: Second buckle 45: Figure-eight buckle 5: Connector 51: Webbing 101: Through hole 203: First storage bag 23: Hip belt 231: First buckle 205: Groove 25: First shoulder belt 251: First sub-buckle 26: Second shoulder belt 261: Second sub-buckle 28: Hip belt guard 280: Limiting belt 281: Bottom 282: Connection part 2820: Top opening 2821, 2822: Positioning sleeve 2823: Accommodation recess 15: Third engagement part 150: Block 151, 152: Lugs 100a: Main body 6: Cardboard 60: Slot 601: Card hole 61, 62: Ends W1, W2: Width a: Upper included angle FIG. 1 shows a perspective view of a child safety seat according to a first embodiment of the present invention. FIG. 2 shows a partial perspective view of a seat belt limiting device in a child safety seat according to a first embodiment of the present invention. FIG. 3 shows a side view of a partial structure of the seat belt limiting device shown in FIG. 2. FIG. 4 shows a perspective view of a child safety seat according to a second embodiment of the present invention. FIG. 5 shows a perspective view of a child safety seat according to a third embodiment of the present invention. FIG. 6 shows a perspective view of a child safety seat according to a fourth embodiment of the present invention. FIG. 7 shows a perspective view of a child safety seat according to a fifth embodiment of the present invention, wherein the seat belt limiting device is in a state of pulling the shoulder strap portion. FIG. 8 shows a partial perspective view of a child safety seat according to a fifth embodiment of the present invention. FIG. 9 shows a perspective view of a seat belt limiting device in a child safety seat according to a fifth embodiment of the present invention. FIG. 10 shows another perspective view of a child safety seat according to a fifth embodiment of the present invention, wherein the seat belt limiting device is in a state of simultaneously pulling the shoulder strap portion and the waist belt portion. FIG. 11 shows a partial perspective view of a child safety seat according to a fifth embodiment of the present invention. FIG. 12 shows a front view of a child safety seat according to a sixth embodiment of the present invention, wherein the seat belt limiting device is clamped with the crotch strap. FIG. 13 shows a front view of a child safety seat according to a sixth embodiment of the present invention, wherein the seat belt limiting device is removed from the crotch strap and stored in the second accommodation groove. FIG. 14 shows a front view of a child safety seat according to a seventh embodiment of the present invention. FIG. 15 shows a perspective view of an embodiment of a seat belt limiting device in a child safety seat according to a seventh embodiment of the present invention, and the seat belt limiting device is in a separated state from the crotch strap guard. FIG. 16 shows a side view of FIG. 15. FIG. 17 shows a perspective view of another embodiment of a seat belt limiting device in a child safety seat according to a seventh embodiment of the present invention, and the seat belt limiting device is in a separated state from the crotch strap guard. FIG. 18 shows a perspective view of yet another embodiment of a seat belt limiting device in a child safety seat according to a seventh embodiment of the present invention, and the seat belt limiting device is in a separated state from the crotch strap guard. FIG. 19 shows a perspective view of yet another embodiment of a seat belt limiting device in a child safety seat according to a seventh embodiment of the present invention, and the seat belt limiting device is in a separated state from the crotch strap guard. FIG. 20 shows a perspective view of yet another embodiment of a seat belt limiting device in a child safety seat according to a seventh embodiment of the present invention, and the seat belt limiting device is in a separated state from the crotch strap guard. FIG. 21 shows a rear perspective view of yet another embodiment of a seat belt limiting device in a child safety seat according to a seventh embodiment of the present invention, and the seat belt limiting device is in a connected state with the crotch strap guard. Figure 22 shows a perspective view of the seat belt limiting device and the crotch belt guard shown in Figure 21 in a separated state. Figure 23 shows a side view of Figure 22. Figure 24 shows a perspective view of another embodiment of the seat belt limiting device in a child safety seat according to the seventh embodiment of the present invention, where the seat belt limiting device and the crotch belt guard are in a connected state. Figure 25 shows a perspective view of the seat belt limiting device and the crotch belt guard shown in Figure 24 in a separated state. 1000: Child safety seat 100: Seat belt limiting device 200: Seat body 21: Seat portion 211: Side portion 22: Backrest portion 221: Side portion 23: Crotch belt 31: Shoulder belt portion 32: Waist belt portion

Claims

1. A child safety seat adapted to be secured to a vehicle seat via a vehicle's seatbelt, the child safety seat comprising: A seat body having a connector; and a seat belt limiting device having a first end and a second end opposite to each other, the first end having a first engagement portion and the second end having a second engagement portion; wherein the seat belt limiting device is adapted to be detachably engaged with the vehicle seat belt via the first engagement portion, and the second engagement portion is adapted to be detachably engaged with the connector, thereby enabling the seat belt limiting device to be attached to the seat body and to apply a downward traction force to the vehicle seat belt.

2. The child safety seat as claimed in claim 1, wherein the seat belt limiting device is adapted to be detachably engaged via the first engagement portion with at least one of the shoulder strap portion and the lap belt portion of the vehicle seat belt to apply a downward traction force to the vehicle seat belt.

3. The child safety seat as described in claim 1, wherein: The seat body includes a seat portion and a backrest portion, the seat portion being provided with a crotch strap mounting portion; the seat body also includes a crotch strap connected to the crotch strap mounting portion, the end of the crotch strap being fitted with a first buckle serving as the connector.

4. The child safety seat as described in claim 3, wherein: The seat body is equipped with a first shoulder strap and a second shoulder strap. The first shoulder strap is equipped with a first buckle, and the second shoulder strap is equipped with a second buckle. The first buckle and the second buckle are adapted to be detachably engaged with the first buckle. The backrest is provided with a first receiving groove and a second receiving groove on both sides. When the first buckle and the second buckle are engaged with the first buckle, the seat belt limiting device is adapted to be placed in either the first receiving groove or the second receiving groove. When the second engagement portion of the seat belt limiting device engages with the first buckle, the first sub-buckle is adapted to be placed in the first receiving groove, and the second sub-buckle is adapted to be placed in the second receiving groove.

5. The child safety seat as claimed in claim 1, wherein the seat belt limiting device is a one-piece molded part.

6. The child safety seat as claimed in claim 1, wherein the child safety seat is configured with a storage structure, the seat belt limiting device being adapted to be accommodated in the storage structure when the seat belt limiting device is detached from the connector via the second engagement.

7. The child safety seat as claimed in claim 6, wherein the storage structure includes a recess provided in front of the seat portion or backrest portion of the seat body.

8. The child safety seat as claimed in claim 1, wherein: The seat body includes a seat portion and a backrest portion, and a crotch strap mounting portion is provided in the middle of the seat portion; the seat body also includes a crotch strap and a crotch strap guard connected to the crotch strap mounting portion, and the crotch strap guard includes a connecting portion serving as the connecting member.

9. The child safety seat as described in claim 8, wherein: The second joint is selected from at least one of the following: Velcro, zipper, magnetic closure, snap, button, and the connecting part has a connector made of the same material as the second joint and which cooperates with it.

10. The child safety seat as claimed in claim 8, wherein the crotch strap guard is provided with a laterally extending restraining strap, the two ends of the restraining strap being laterally connected to the two sides of the crotch strap guard, and the crotch strap passing between the restraining strap and the crotch strap guard.

11. The child safety seat as described in claim 8, wherein: The child safety seat also includes a retaining plate with a slot in the middle and a locking hole formed on the wall of the slot; the connecting part includes two positioning sleeves spaced apart on the back side of the crotch strap guard, the two ends of the retaining plate being adapted to be inserted into the two positioning sleeves, and the slot being located between the two positioning sleeves; the second engaging part includes an elastic arm and a locking block disposed on the elastic arm, the elastic arm being adapted to be inserted into the slot, and the locking block being adapted to engage with the locking hole.

12. The child safety seat as described in claim 8, wherein: The connecting portion includes a receiving recess located inside the crotch strap guard, the receiving recess having a top opening; the seat belt limiting device includes an integrally formed body, the second engaging portion includes two lugs extending laterally from the body in opposite directions, the width of the two lugs being greater than the width of the top opening, the two lugs being adapted to obliquely enter the receiving recess through the top opening.

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