Child safety seat and its safety belt adjustment system

Abstract

This application discloses a child safety seat and its safety belt adjustment system. This safety belt adjustment system includes a retraction shaft and a retractor. The retraction shaft is configured to be connected to the safety belt, and the retractor is an automatic retraction device that drives the retraction shaft to perform retraction rotation in order to pull the fastened safety belt. It also includes a drive button and a locking member. The drive button is configured to drive the retraction shaft to perform release rotation. The first locking device includes a locking member having a locking position. In the locking position, the locking member locks the retraction rotation of the retraction shaft.

Description

Technical Field

[0001] This application relates to a child safety seat and its safety belt adjustment system.

Background Art

[0002] Child safety seats (including baby carriers) are generally fixed to vehicle seats and can restrain a child in the seat of the child safety seat using their own safety belt system to protect the child from impacts in the event of vehicle collisions, emergency braking, and other accidents.

[0003] The seat belts of conventional child safety seats generally include two shoulder belts and an adjustment belt. Two sub - buckles are respectively arranged at the front part of the backrest of the child safety seat for the two shoulder belts. The two sub - buckles can be connected to each other to form a male buckle. The parts of the two shoulder belts behind the backrest are both connected to the rear end of the adjustment belt, and the front end of the adjustment belt protrudes from the front end of the seat part of the child safety seat. A crotch belt is further provided on the seat part of the child safety seat, and a female buckle is arranged on the crotch belt. When the male buckle and the female buckle are fastened to each other, it means that the safety belt is fastened, and when the male buckle and the female buckle are separated from each other, it means that the safety belt is not fastened.

[0004] When seating a child in a child safety seat, the user (such as a parent raising the child) first fastens the male buckle of the shoulder belt and the female buckle of the crotch belt to each other, and then manually pulls the adjustment belt to pull the entire safety belt. In this case, since the adjustment belt locking device automatically restricts the movement of the adjustment belt, the safety belt is kept in a pulled state, thus firmly restraining the child in the child safety seat.

[0005] In related technologies, an automatic retractor is provided on a safety belt. The automatic retractor includes a coil spring and a retraction shaft. The front end of an adjustment belt is connected to the retraction shaft. The coil spring applies a retraction force for retracting the adjustment belt to the retraction shaft. In this way, there is no need to manually pull the adjustment belt, and the fastened safety belt is automatically pulled. However, it is difficult to control the retraction force applied by the coil spring to the retraction shaft, and the seat belt is likely to become extremely tight or extremely loose, making it difficult to balance the comfort and safety of a child sitting on the seat.

Summary of the Invention

[0006] The present application is to provide a child safety seat and its safety belt adjustment system that achieve the comfort and safety of a child sitting on a seat.

[0007] In one aspect, the present application provides a safety belt adjustment system for a child safety seat. This safety belt adjustment system includes a retraction shaft and a retractor. The retraction shaft is configured to be connected to a safety belt. The retractor is an automatic retractor that executes a retraction rotation for driving the retraction shaft to retract the safety belt in order to pull the fastened safety belt. It also includes a drive button and a lock member. The drive button is configured to execute a release rotation for driving the retraction shaft to release the safety belt. The system further includes a first locking device. The lock member has a locking position. In the locking position, the lock member locks the retraction rotation of the retraction shaft.

[0008] In one embodiment, the locking member further locks the release rotation of the retracting shaft in the locked position, and the locking member has a non-locking position where it does not lock the retracting shaft. When the safety belt is not fastened, the locking member is in the non-locking position. After the safety belt is fastened and pulled by the automatic retractor device, when a pressing force is applied to the drive button to drive the retracting shaft to perform a release rotation, the retracting shaft releases a safety belt of a predetermined length while the locking member switches from the non-locking position to the locking position.

[0009] In one embodiment, the automatic retractor device further includes a support. The retracting shaft and the retractor are attached to the support. The support is configured to be attached to the seat housing of the child safety seat. The drive button is configured to be attached to the seat housing.

[0010] In one embodiment, the drive button includes a pressing end portion and a contact end portion on the opposite side of the pressing end portion. When a pressing force is applied to the drive button, the contact end portion presses a portion of the safety belt that is not wound around the retracting shaft, and the safety belt is deformed by the force applied by the contact end portion to drive the retracting shaft to perform a release rotation.

[0011] In one embodiment, after the locking member switches from the non-locking position to the locking position, the pressing force is removed, the drive button is reset, and the locking member is held in the locking position. When the safety belt is switched from the fastened state to the unfastened state, the locking member switches from the locking position to the non-locking position.

[0012] In one embodiment, the seatbelt adjustment system further includes a second locking device. The second locking device includes a ratchet, a pawl, and a second elastic element. The ratchet is connected to the retraction shaft. The pawl is pivotally connected to the support via a second pivot portion and is further connected to the cable. When the seatbelt is switched from the unfastened state to the fastened state, the pawl is pulled by the cable and rotates to disengage from the ratchet. When the seatbelt is switched from the fastened state to the unfastened state, the pawl is driven by the second elastic element and rotates to engage with the ratchet, thus locking the retraction rotation of the retraction shaft. When the pawl disengages from the ratchet and the locking member switches to the locked position, the pawl can act on the locking member to hold the locking member in the locked position. When the pawl engages with the ratchet, the locking member can return to the unlocked position.

[0013] In one embodiment, the second pivot portion supports the seatbelt outside the retraction shaft, and the abutting end of the drive button is located between the retraction shaft and the second pivot portion.

[0014] In one embodiment, the locking member includes a first support portion and a locking pin portion. The first support portion is pivotally connected to the support via a first pivot portion. The first pivot portion is parallel to the retraction shaft. The locking pin portion is connected to the first support portion. The locking member rotates about the first pivot portion to switch between the locked position and the unlocked position. A first groove is provided in the support, and a locking gear is attached to the retraction shaft. A second groove is formed between two adjacent teeth of the locking gear. When the locking member is in the locked position, the locking pin portion fits into the first groove and the second groove aligned with the first groove. When the locking member is in the unlocked position, the locking pin portion is separated from the first groove and the second groove.

[0015] In one embodiment, the first locking device further includes a first elastic member, a third elastic member, a pivoting arm, and a pressing member. The first elastic element applies a first torque to the locking member so as to rotate the locking member toward the locking position. The central portion of the pivoting arm is pivotally connected to the support through a third pivot portion. The third pivot portion is parallel to the first pivot portion, and the first half arm of the pivoting arm abuts against the first support portion. The third elastic member drives the pivoting arm to rotate in a first direction about the third pivot portion, whereby the first half arm applies a second torque to the first support portion so as to rotate the locking member toward the unlocking position. The pressing member is connected to the drive button. The pressing member presses the second half arm of the pivoting arm when a pressing force is applied to the drive button, so that the pivoting arm rotates in a second direction about the third pivot portion until the second half arm abuts against the pawl. The second direction is opposite to the first direction.

[0016] In one embodiment, the pawl includes a hook portion and a contact portion. The hook portion is connected to the cable and configured to engage with the ratchet. The extending direction of the contact portion is opposite to the extending direction of the hook portion. The contact portion is configured to abut against the second half arm to limit the rotation of the pivoting arm in the first direction.

[0017] In one embodiment, the contact portion includes a side contact wall and a limiting step located at the end of the side contact wall. When the pawl disengages from the ratchet and the pivoting arm rotates in the second direction, the end of the second half arm abuts against the side contact wall until the end of the second half arm passes over the side contact wall and abuts against the limiting step.

[0018] In one embodiment, the hook portion and the contact portion are separate parts. A second pivot portion passes through the hook portion and the contact portion. The second elastic element is a torsion spring. The second pivot portion passes through the torsion spring disposed between the hook portion and the contact portion. The two spring arms of the torsion spring are respectively connected to the hook portion and the contact portion.

[0019] In one embodiment, the first locking device further includes a mounting rack. The mounting rack is connected to the support. The central portion of the pushing member is pivotally connected to the mounting rack via a fourth pivot portion. The fourth pivot portion is perpendicular to the retracting shaft. The first end of the pushing member is bent and connected to the drive button. When a pressing force is applied to the drive button, the drive button drives the pushing member to rotate about the fourth pivot portion, and thus the second end of the pushing member presses the second half arm.

[0020] In one embodiment, the pushing member is made of an elastically deformable metal rod. The central portion of the metal rod forms a ring that can be wound around the fourth pivot portion.

[0021] In one embodiment, the mounting rack is connected to the support via a second pivot portion, and a rotation stopper structure configured to limit the rotation of the mounting rack about the second pivot portion is disposed between the mounting rack and the support.

[0022] In one embodiment, the second pivot portion is further passed through a shaft sleeve.

[0023] In one embodiment, the mounting rack includes a first frame and a second frame disposed opposite to each other, and a third frame connected between the first frame and the second frame. The second pivot portion extends through the first frame and the second frame. The safety belt passes between the second pivot portion and the third frame. The third frame includes a hinge base protruding outward, and the fourth pivot portion is connected to the hinge base.

[0024] In one embodiment, the rotation stopper structure includes limiting recesses disposed on the first frame and the second frame, and connection lugs disposed on the support. The connection lugs are respectively fitted into the limiting recesses. The second pivot portion extends through the limiting recesses and the connection lugs.

[0025] In one embodiment, the seat housing includes a display window. The lock member further includes a second support portion. The second support portion is connected to the first support portion. An indicator is disposed on the second support portion. The indicator includes a first display area and a second display area. When the lock member is in the locked position, the first display area of the indicator faces the display window, and when the lock member is in the unlocked position, the second display area of the indicator faces the display window.

[0026] In one embodiment, the seat housing includes a reminder device. The reminder device is configured to remind of the position state of the lock member.

[0027] In one embodiment, the reminder device includes an audible reminder and / or a visual reminder.

[0028] In one embodiment, the support includes a first side wall and a second side wall facing the first side wall. A first end of the retraction shaft extends through the first side wall, and a second end of the retraction shaft extends through the second side wall. The ratchet is attached to the first end of the retraction shaft, and the retractor is attached to the second end of the retraction shaft. A pivot arm is pivotally connected to the first side wall via a third pivot portion. The pivot arm is located outside the first side wall. Two locking gears are provided. One of the two locking gears is located near the inside of the first side wall, and the other of the two locking gears is located near the inside of the second side wall. The length of the lock pin portion extends across the first side wall and the second side wall. A first groove is provided in each of the first side wall and the second side wall.

[0029] In one embodiment, the seat housing includes a seat portion. The seat portion includes a cavity for accommodating the support. A cover is attached to the top of the cavity. A drive button is attached to the cover. A reset spring is attached between the cover and the drive button.

[0030] In one embodiment, the seat belt adjustment system further includes a pulling mechanism. The pulling mechanism includes a cable. When the seat belt is switched from an unfastened state to a fastened state, the pulling mechanism drives a pawl via the cable to disengage it from the ratchet.

[0031] In one embodiment, the seat belt includes a first buckle, and the seat belt adjustment system further includes a crotch belt. The crotch belt includes a second buckle. The pulling mechanism includes a rod member, a cable, and a fourth elastic member. The rod member and the fourth elastic member are attached to the second buckle. The fourth elastic element drives the rod member so that a first end of the rod member can protrude from the second buckle. A second end of the rod member is connected to a first end of the cable. A second end of the cable is connected to the pawl. When the first buckle and the second buckle are fastened to each other, the rod member is pushed by the first buckle and retracts into the second buckle, thereby driving the cable and pulling the pawl.

[0032] In another aspect, the present application further provides a child safety seat. This child safety seat includes a seat belt adjustment system as described above.

[0033] According to the seat belt adjustment system provided by the present application, when the seat belt is in a fastened state and is pulled, the retraction shaft is controlled by a drive button to release a seat belt of a predetermined length, and at the same time, the retraction rotation of the retraction shaft is restricted by a locking member, so that the seat belt is moderately loosened and maintained in such a loosened state. In this way, on the one hand, the problem of excessive pulling of the seat belt caused by the large pulling force of the retractor can be prevented. On the other hand, the problem of excessive loosening of the seat belt caused by the small pulling force of the retractor can be prevented. Therefore, the requirement for the pulling force of the retractor is reduced, and the comfort and safety of a child sitting on the seat can be achieved.

Brief Description of the Drawings

[0034]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0035] FIG. 2 is a perspective view schematically showing a seat belt adjustment system 100 for a child safety seat (hereinafter abbreviated as the seat belt adjustment system 100) applied to a child safety seat. FIG. 1 schematically shows a child safety seat to which the seat belt adjustment system 100 is applied.

[0036] Referring to FIG. 2, the seat belt adjustment system 100 can include a self-retracting device 1 and a first locking device 2. The self-retracting device 1 can include a support 11, a retracting shaft 12, and a retractor 13 (see FIG. 8). The retracting shaft 12 and the retractor 13 are attached to the support 11. The support 11 is configured to be attached to a seat housing 200 (see FIG. 1) of a child safety seat. The support 11 may be disposed, for example, in a seat portion 201 of the seat housing 200 near an attachment position of a crotch belt 5 on the seat housing 200. The retracting shaft 12 is configured to be connected to a seat belt 300. In combination with related art, the seat belt 300 generally includes two shoulder belts 30a (see FIG. 9) and an adjustment belt 30b (see FIG. 2). Specifically, the retracting shaft 12 is connected to the adjustment belt 30b. Two sub-buckles are respectively disposed on the two shoulder belts 30a. The two sub-buckles may engage with each other to form a first buckle 301 (see FIG. 1). The crotch belt 5 is attached to the seat portion 201 via a holder 51 (FIG. 9). The crotch belt 5 includes a second buckle 302 (see FIG. 1). In FIG. 9, for ease of explanation, a housing 302a and a housing 302b of the second buckle 302 are engaged with each other. When the first buckle 301 and the second buckle 302 are fastened to each other, it means that the seat belt 300 is fastened. In contrast, when the first buckle 301 is pulled out from the second buckle 302, it means that the seat belt 300 is not fastened. As can be understood from FIG. 4, the adjustment belt 30b of the seat belt 300 is wound around the retracting shaft 12. When the seat belt 300 is in a fastened state, there is no need to pull the adjustment belt 30b, and the retractor 13 of the self-retracting device 1 automatically drives the retracting shaft 12 to perform a retracting rotation R1 in order to retract the adjustment belt 30b onto the retracting shaft 1, thereby facilitating the overall pulling of the fastened seat belt 300. The retractor 13 may be a coil spring.In this case, when the safety belt 300 is not fastened, there is no need to operate the unlocking member, and the adjustment belt 30b can be pulled out from the retracting shaft 12 by directly pulling the two shoulder belts 30a. Therefore, the use lengths of the two shoulder belts 30a in front of the backrest of the child safety seat can be increased, allowing the child to easily sit on the seat and easily fasten the safety belt.

[0037] Referring to FIG. 8, in some embodiments, the support 11 can include, for example, a first side wall 111 and a second side wall 112 opposite to the first side wall 111. The first end portion 122 of the retracting shaft 12 extends through the first side wall 111, and the second end portion (not shown) of the retracting shaft 12 extends through the second side wall 112. The retracting shaft 12 is supported by the first side wall 111 and the second side wall 112. The portion of the retracting shaft 12 between the first side wall 111 and the second side wall 112 is configured to wind up the adjustment belt 30b. The retractor 13 is attached to the second end portion of the retracting shaft 12 and is located outside the second side wall 112. In some embodiments, a protective housing 130 is further attached outside the second side wall 112, and the protective housing 130 is configured to protect the retractor 13.

[0038] In some embodiments, the retraction shaft 12 may be integrally formed. In some other embodiments, the retraction shaft 12 may include a plurality of components. For example, referring to FIG. 4, the retraction shaft 12 can include a mandrel 1201 and a cylindrical body 1202. The mandrel 1201 is passed through the cylindrical body 1202, and the cylindrical body 1202 is connected to the mandrel 1201 in such a way that the cylindrical body 1202 cannot rotate relative to the mandrel 1201. Two ends of the mandrel 1201 extend through the first side wall 111 and the second side wall 112, respectively. The cylindrical body 1202 is located between the first side wall 111 and the second side wall 112. The adjustment belt 30b is wound around the cylindrical body 1202. In some embodiments, a notch 12020 is provided in the cylindrical body 1202, and the adjustment belt 30b includes a portion 305 that can snap into the notch 12020.

[0039] Referring to FIGS. 2 and 4 to 8, the first locking device 2 can include a drive button 21 and a locking member 22. The drive button 21 is configured to be attached to the seat housing 200 and is configured to drive the retraction shaft 12 to perform a release rotation R2 that loosens the safety belt 300. The locking member 22 has a locked position (FIG. 7) and an unlocked position (FIG. 2). In the locked position, the locking member 22 locks the retraction rotation R1 and the release rotation R2 of the retraction shaft 12. In the unlocked position, the locking member 22 releases the retraction shaft 12, and the locking member 22 does not lock the retraction rotation R1 and the release rotation R2 of the retraction shaft 12.

[0040] Referring to FIGS. 2, 7, and 9, the position of the lock member 22 is related to the state of the safety belt 300 and the operation of the drive button 21. Specifically, when the safety belt 300 is not fastened, the lock member 22 is in the unlocked position. In this case, the lock member 22 does not restrict the rotation of the retraction shaft 12, and the user can pull out the adjustment belt 30b from the retraction shaft 12 by pulling the shoulder belt 30a to increase the use length of the shoulder belt 30a. Alternatively, in some embodiments, when the safety belt 300 is not fastened, the adjustment belt 30b can also be further wound around the retraction shaft 12 due to the presence of the retractor 13. After switching from the state where the safety belt 300 is not fastened to the fastened state, the retractor 13 automatically drives the retraction shaft 12 to retract the adjustment belt 30b, and the safety belt 300 is pulled as a whole. After the safety belt 300 is pulled as a whole, the user can apply a pressing force P (see FIG. 4) to the drive button 21, and the drive button 21 drives the retraction shaft 12 to execute a release rotation R2. As a result, the retraction shaft 12 releases a safety belt 30b of a predetermined length, and the lock member 22 switches from the unlocked position to the locked position.

[0041] When the drive button 21 controls the retraction shaft 12 to release a safety belt 30b of a predetermined length, at the same time, the lock member 22 in the locked position restricts the retraction rotation R1 and the release rotation R2 of the retraction shaft 12, so that the safety belt 300 is moderately loosened and maintained in such a loosened state. In this way, on the one hand, the problem of discomfort of children caused by excessive pulling of the safety belt caused by the large pulling force of the retractor 13 can be prevented. On the other hand, the problem that the safety belt cannot securely restrain the child due to excessive loosening of the safety belt 300 caused by the small pulling force of the retractor 13 can be prevented. Therefore, the requirement for the pulling force of the retractor 13 is reduced, and the comfort and safety of the child sitting on the seat are balanced.

[0042] Referring to FIGS. 1 and 4, the seat housing 200 has a seat portion 201 and a backrest portion 205. The seat portion 201 includes a cavity (not shown) for accommodating the support 11. A cover 202 can be attached to the upper part of the cavity. The drive button 21 is attached to the cover 202. Further, a reset spring 203 can be attached between the cover 202 and the drive button 21. When the pressing force applied to the drive button is removed, the drive button 21 can be driven and reset by the reset spring 203.

[0043] Referring to FIG. 4, the drive button 21 can include a pressing end portion 211 and a contact end portion 212 on the side opposite to the pressing end portion 211. After the safety belt 300 is fastened and pulled by the automatic retractor 1, by applying a pressing force P to the pressing end portion of the drive button 21, the contact end portion 212 moves downward to press a portion of the adjustment belt 30b that is not wound around the retraction shaft 12. While the adjustment belt 30b is deformed by the force, the retraction shaft 12 is driven to perform a release rotation. It will be understood that by controlling the stroke of the drive button 21, the retraction shaft 12 can be controlled to release a specific length of the adjustment belt. In some embodiments, the first locking device 2 is configured as follows: When the safety belt 300 is switched from the unfastened state to the fastened state, first the drive button 21 is pushed into a predetermined position, the retraction shaft 12 releases an adjustment belt 30b of a predetermined length, and the locking member 22 reaches the locked position. Thereafter, even if the pressing force P is removed and the drive button 21 is reset, the locking member 22 remains held in the locked position to prevent the retraction of the released predetermined length of the adjustment belt 30b. When the safety belt 300 is switched from the fastened state to the unfastened state, the locking member 22 automatically switches from the locked position to the unlocked position, and the restriction on the rotation of the retraction shaft 12 is released. Although the drive button 21 is pressing the adjustment belt 30b to enable the execution of the release rotation R2 of the retraction shaft 12, it should be noted that in some embodiments, the drive button 21 may directly drive the retraction shaft 12, for example, to perform the release rotation R2.

[0044] Referring to FIGS. 2 and 5 - 7, in some embodiments, the seatbelt adjustment system 100 can further include a second locking device 3. The second locking device 3 is configured to lock the retraction rotation R1 of the retraction shaft 12 when the seatbelt is not fastened. The second locking device 3 can include a ratchet 31, a pawl 32, and a second elastic element 97. The ratchet 31 is connected to the retraction shaft 12 (more specifically, the mandrel 1201) and rotates with the retraction shaft 12. The ratchet 31 is connected, for example, to the first end 122 of the retraction shaft 12 and is located outside the first sidewall 111. The pawl 32 is pivotally connected to the support 11 via a second pivot portion 92. In some embodiments, mounting holes 920 (FIG. 8) may be provided in each of the first sidewall 111 and the second sidewall 112, and the second pivot portion 92 is attached to the mounting holes 920. Referring to FIG. 5, when switching from a state where the seatbelt 300 is not fastened to a fastened state, the pawl 32 is pulled by the cable 42 and rotates about the second pivot portion 92 until the pawl 32 disengages from the ratchet 31. In this case, the second locking device 3 does not limit the rotation of the retraction shaft 12. When the drive button 21 is not pressed, the locking member 22 is in the unlocked position, and the retraction shaft 12 can automatically retract the adjustment belt 30b under the action of the retractor 13, and thus the seatbelt 300 is pulled. In contrast, when switching from a state where the seatbelt 300 is fastened to a non - fastened state, the pawl 32 is driven by the second elastic element 97 and rotates about the second pivot portion 92 until the pawl 32 engages with the ratchet 31. The pawl 32 and the ratchet 31 engage with each other so as to be able to limit the retraction rotation R1 of the retraction shaft 12, but the release rotation R2 of the retraction shaft 12 is not limited, which helps to stabilize the drawn - out length of the adjustment belt 30b.

[0045] Referring to FIG. 4, the second pivot portion 92 supports the adjustment belt 30b at a position close to the retraction shaft 12, and the contact end portion 212 of the drive button 21 is located between the retraction shaft 12 and the second pivot portion 92. The drive button 21 is configured to press the adjustment belt 30b between the retraction shaft 12 and the second pivot portion 92. In this way, the deformation of the adjustment belt 30b effectively acts on the retraction shaft 12, enabling the execution of the release rotation R2 of the retraction shaft 12.

[0046] In some embodiments, the pawl 32 can be disengaged from the ratchet 31 under the action of the pulling mechanism 4. Referring to FIGS. 2, 9, and 10, the pulling mechanism 4 can include a rod member 41, a cable 42, and a fourth elastic member 99. The rod member 41 and the fourth elastic member 99 are attached to the second buckle 302. The rod member 41 can reciprocate along the direction of engagement or separation of the first buckle 301. The fourth elastic element 99 can be a spring. The fourth elastic element 99 drives the rod member 41 so that the first end 411 of the rod member 41 can protrude from the second buckle 302. The second end 412 of the rod member 41 is connected to the first end 421 of the cable 42. The cable 42 is wound around a convex portion 410 of the rod member 41 within the second buckle 302. The second end 422 of the cable 42 is connected to the mounting hole 320 (see FIG. 3) of the pawl 32. The cable 42 can be a steel wire. At least a portion of the cable 42 can be covered with a protective sleeve 420. When the first buckle 301 is inserted into the second buckle 302 and fastened to the second buckle 302, the rod member 41 is pushed by the first buckle 301 and retracts into the second buckle 302, so that the cable 42 is driven to pull the pawl 32, and thus the pawl 32 rotates about the second pivot portion 92 to a position away from the ratchet 31. When the first buckle 301 is pulled out of the second buckle 302 and separated from the second buckle 302, the fourth elastic element 99 can push the rod member 41 outwards, and the pawl 32 rotates about the second pivot portion 92 under the action of the second elastic element 97 and engages with the ratchet 31. It can be understood that the configuration of the pulling mechanism 4 for driving the pawl 32 to disengage from the ratchet 31 is not limited to the above embodiments.

[0047] As can be understood from the above, in order to achieve the effect that the safety belt 300 is fastened and the automatic retractor 1 retracts the adjustment belt 30b and pulls the entire safety belt 300, and then the user adjusts the tightness of the safety belt 300, by pressing the drive button 21, the adjustment belt 30b of a predetermined length can be released, and the locking member 22 can be brought to the locked position. When the safety belt 300 is not fastened, the locking member 22 is switched to the unlocked position so as not to affect the normal release of the safety belt 300. That is, there is no need to operate any unlocking member, and the use length of the two shoulder belts 30a can be increased by directly pulling the two shoulder belts 30a, so that a child can be easily seated on the seat and the safety belt can be fastened. Further, when the safety belt 300 is fastened, the claw 32 disengages from the ratchet 31. When the safety belt is not fastened, the claw 32 engages with the ratchet 31. In some embodiments, the change in the position of the locking member 22 may be associated with the change in the position of the claw 32. In that case, when the seat belt 300 is fastened, the locking member 22 is held in the locked position by the claw 32, and when the seat belt 300 is not fastened, the locking member 22 automatically switches to the unlocked position as the claw 32 moves. Referring to FIG. 7, in some embodiments, when the claw 32 disengages from the ratchet 31 and the locking member 22 switches to the locked position, the claw 32 can act on the locking member 22 to hold the locking member 22 in the locked position. Referring to FIG. 2, when the claw 32 engages with the ratchet 31, the claw 32 moves away from the locking member 22, the claw 32 does not act on the locking member 22, and the locking member 22 automatically returns to the unlocked position. An exemplary way of associating the change in the position of the locking member 22 with the change in the position of the claw 32 is illustrated below. Needless to say, the way of associating the change in the position of the locking member 22 with the change in the position of the claw 32 is not limited to the following embodiments.

[0048] Referring to FIGS. 2, 3, and 5 to 8, the lock member 22 can include a first support portion 221 and a lock pin portion 223. The first support portion 211 is pivotally connected to the first side wall 111 and the second side wall 112 of the support 11 via the first pivot portion 91. The lock pin portion 223 is connected to the first support portion 221. Referring to FIG. 8, the first pivot portion 91 projects from the first support portion 221 and has two projecting columns extending in directions facing each other. The two projecting columns are respectively attached to the mounting holes 910 of the first side wall 111 and the second side wall 112. Needless to say, in some embodiments, the first pivot portion 91 may be a long shaft extending through the mounting holes 910 of the first side wall 111 and the second side wall 112. The first pivot portion 91 is parallel to the retraction shaft 12, and the lock pin portion 223 may also be parallel to the retraction shaft 12. When the lock member 22 rotates about the first pivot portion 91 to switch between the locked position and the unlocked position, the rotation in both directions (retraction rotation R1 and release rotation R2) of the retraction shaft 12 is locked or released by the lock pin portion 223.

[0049] Referring to FIG. 8, in some embodiments, the length of the locking pin portion 223 extends to the first side wall 111 and the second side wall 112. A first groove 110 may be provided in each of the first side wall 111 and the second side wall 112 of the support 11. Two locking gears 121 may be attached to the retraction shaft 12. One of the two locking gears 121 is located inside the first side wall 111, and the other of the two locking gears 121 is located inside the second side wall 112. Each of the two locking gears 121 is connected to the retraction shaft 12 in such a way that the locking gear 121 cannot rotate relative to the retraction shaft 12. Referring to FIGS. 4 and 8, in some embodiments, the two locking gears 121 are respectively attached to two ends of the cylindrical body 1202. A second groove 1210 is formed between two adjacent teeth of each of the two locking gears 121. When the locking member 22 is in the locked position, the locking pin portion 223 fits into the first groove 110 and the second groove 1210 aligned with the first groove 110. In contrast, when the locking member 22 is in the unlocked position, the locking pin portion 223 is separated from the first groove 110 and the second groove 1210. In some embodiments, the length of the locking pin portion 223 may, for example, only extend to the first side wall 111. In this case, the first groove 110 may be provided only in the first side wall 111, and correspondingly, only one locking gear 121 is attached inside the first side wall 111. In this way, when the locking member 22 rotates, the locking pin portion 223 can also lock or release the rotation of the retraction shaft 12 in both directions.

[0050] Referring to FIGS. 2 to 8, the first locking device 2 may further include a first elastic member 96, a third elastic member 98, a pivoting arm 23, and a pressing member 24.

[0051] The first elastic member 96 is, for example, a spring connected between the first support portion 221 and the first side wall 111 of the support 11, and may be a tension spring, and is configured to apply a first torque to the lock member 22 so as to rotate the lock member 22 toward the lock position. In other embodiments, the first elastic member 96 may be a torsion spring.

[0052] Referring to FIGS. 2 and 5 to 8, the central portion of the pivoting arm 23 is pivotally connected to the first side wall 111 of the support 11 via a third pivot portion 93. The third pivot portion 93 divides the pivoting arm 23 into a first half arm 231 and a second half arm 232. The pivoting arm 23 is located outside the first side wall 111. The third pivot portion 93 is parallel to the first pivot portion 91. The first half arm 231 of the pivoting arm 23 abuts against the first support portion 221, and the second half arm 232 is closer to the claw 32 than the first half arm 231. The first side wall 111 is provided with a mounting hole 2302 for mounting the third pivot portion 93. The pivoting arm 23 is provided with a mounting hole 2301 for mounting the third pivot portion 93. The third elastic member 98 is, for example, a spring connected between the pivoting arm 23 and the first side wall 111 of the support 11, and may be a tension spring, and is configured to drive the pivoting arm 23 to rotate in a first direction S1 (as shown in FIGS. 6 and 7) about the third pivot portion 93, whereby the first half arm 231 applies a second torque to the first support portion 221 so as to rotate the lock member 22 toward the unlock position. The value of the second torque is greater than the value of the aforementioned first torque in order to hold the lock member 22 in the unlock position. In some embodiments, the third elastic member 98 may be a torsion spring around the third pivot portion 93.

[0053] Referring to FIGS. 3, 4, and 6, the push member 24 is connected to the drive button 21. When a pressing force P is applied to the drive button 21, the push member 24 presses the second half arm 232 of the pivot arm 23. Thus, the pivot arm 23 overcomes the second torque and rotates in the second direction S2 (as shown in FIGS. 6 and 7) about the third pivot portion 93 until the second half arm 232 abuts against the claw 32. In this case, the push member 24 does not drive the pivot arm 23 to rotate in the second direction S2, but rather uses the abutment of the claw 32 against the pivot arm 23 to limit the rotation of the pivot arm 23 in the first direction S1 so that the pivot arm 23 reaches a stable state, where the second direction S2 is opposite to the first direction S1. It can be understood that when the pivot arm 23 rotates in the second direction S2, the lock member 22 rotates towards the lock position under the action of the first elastic element 96. In some embodiments, after the drive button 21 is pushed to a predetermined position, the second half arm 232 abuts against the claw 32 and the lock member 22 reaches the lock position.

[0054] Referring to FIGS. 3 and 8, the first locking device 2 can further include a mounting rack 25. The mounting rack 25 is connected to the support 11, and the central portion of the pressing member 24 is connected to the mounting rack 25. More specifically, the mounting rack 25 is connected to the support 11 via a second pivot portion 92, and a rotation stopper structure configured to limit the rotation of the mounting rack 25 about the second pivot portion 92 is disposed between the mounting rack 25 and the support 11. The rotation stopper structure can include two limiting recesses 2510 and two connection lugs 106. The two connection lugs 106 are respectively disposed on the first side wall 111 and the second side wall 112 of the support 11. The two limiting recesses 2510 are disposed on the mounting rack 25. The two connection lugs 106 fit into the two limiting recesses 2510. The second pivot portion 92 extends through each of the limiting recesses 2510 and each of the connection lugs 106. By each of the connection lugs 106 abutting against the corresponding limiting recess 2510, the rotation of the mounting rack 25 about the second pivot portion 92 is limited. It will be understood that the realization of the rotation stopper structure is not limited to the above embodiments.

[0055] Referring to FIG. 8, the central portion of the pressing member 24 is specifically pivotally connected to the mounting rack 25 via the fourth pivot portion 94. The fourth pivot portion 94 is perpendicular to the retracting shaft 12. The mounting rack 25 is provided with a mounting hole 2530 to which the fourth pivot portion 94 is attached. The first end 241 of the pressing member 24 is bent and then connected to the drive button 21. For example, the drive button 21 is provided with an elongated hole 210 (see FIG. 4). The first end 241 of the pressing member 24 is inserted into the elongated hole 210. When a pressing force P is applied to the drive button 21, the drive button 21 drives the pressing member 24 to rotate about the fourth pivot portion 94. Accordingly, the second end 242 of the pressing member 24 is lifted and presses and rotates the second half arm 232. Referring to FIGS. 3 and 8, the pressing member 24 may be made of an elastically deformable metal rod, and the central portion of the metal rod forms a ring 243 that can be wound around the fourth pivot portion 94. Needless to say, the implementation of the pressing member 24 is not limited to the above embodiments.

[0056] Referring to FIG. 8, the mounting rack 25 may include a first frame 251 and a second frame 252 arranged opposite to each other, and a third frame 253 and a fourth frame 254 connected between the first frame 251 and the second frame 252. The fourth frame 254 faces the third frame 253. The first frame 251 is located inside the first side wall 111, and the second frame 252 is located inside the second side wall 112. The second pivot portion 92 extends through the mounting holes 2512 of the first frame 251 and the second frame 252. The above-described limiting recess 2510 may be arranged on the first frame 251 and the second frame 252. A hinge base 2531 protruding outward may be provided on the third frame 253. A mounting hole 2530 is arranged on the hinge base 2531. The fourth pivot portion 94 is connected to the hinge base 2531 through the mounting hole 2530. Referring to FIG. 4, in some embodiments, a shaft sleeve 921 may be further sleeved on the second pivot portion 92. The shaft sleeve 921 is located between the first frame 251 and the second frame 252 and is configured to contact the adjustment belt 30b. The shaft sleeve 921 can rotate with respect to the axis of the second pivot portion 92 so as to reduce the frictional force between the safety belt and the shaft sleeve 921. The adjustment belt 30b of the safety belt 300 passes between the second pivot portion 92 and the third frame 253, and the safety belt 300 is restricted within an elongated space surrounded by the first frame 251, the second frame 252, the third frame 253, and the second pivot portion 92, thereby preventing the safety belt 300 from being located outside the pressing trajectory of the drive button 21 due to any slide on the second pivot portion 92.

[0057] Referring to FIG. 4, in some embodiments, a shaft sleeve 921 may be further sleeved on the second pivot portion 92. The shaft sleeve 921 is located between the first frame 251 and the second frame 252 and is configured to contact the adjustment belt 30b. The shaft sleeve 921 can rotate with respect to the axis of the second pivot portion 92 so as to reduce the frictional force between the safety belt and the shaft sleeve 921.

[0058] Referring to FIG. 7, the claw 32 of the second locking device 3 can include a hook portion 321 and a contact portion 322. The hook portion 321 is connected to the cable 42 and is configured to engage with the ratchet 31. The extending direction of the contact portion 322 is opposite to the extending direction of the hook portion 321. The contact portion 322 is configured to contact the second half arm 232 to limit the rotation of the pivot arm 23 in the first direction S1 in order to hold the locking member 22 in the locked position.

[0059] Referring to FIG. 2, the abutting portion 322 includes a side contact wall 3221 and a limiting step 3222 located at the end of the side contact wall 3221. Referring to FIG. 5, when the safety belt 300 is switched from the state where it is not fastened to the state where it is fastened, the hook portion 321 of the claw 32 rotates in the direction T1 away from the ratchet 31 and separates from the ratchet 31, and the abutting portion 322 rotates in the direction T2 approaching the second half arm 232 until the side contact wall 3221 is pressed against the end of the second half arm 232. When the locking member 22 is in the unlocked position, the retractor 13 drives the retractor shaft 12 to retract the adjustment belt 30b, thereby pulling the entire safety belt 300. Next, the user presses the drive button 21, and after the drive button 21 is pushed into a predetermined position, the retractor shaft 12 releases the adjustment belt 30b of a predetermined length. Referring to FIG. 6, when the drive button 21 is pressed, it drives the pressing member 24 to rotate about the fourth pivot portion 94, and the second end portion 242 of the pressing member 24 presses the second half arm 232 to rotate it in the second direction S2, and the end of the second half arm 232 slides along the side contact wall 3221 and moves upward. Further referring to FIG. 6, after the drive button 21 is pushed into a predetermined position, the second end portion 242 of the pressing member 24 presses the end of the second half arm 232 so as to pass through the side contact wall 3221, the abutting portion 322 can approach the end of the second half arm 232, and then the end of the second half arm 232 abuts against the limiting step 3222. In this case, the pivoting arm 23 abuts against the abutting portion 322 and balances. At the same time, the first half arm 231 of the pivoting arm 23 does not restrict the movement of the locking member 22 towards the locked position, and the locking member 22 is driven by the first elastic member 96 to move to the locked position and is held in the locked position. Next, referring to FIG. 7, the pressing force P applied to the drive button 21 is removed, the drive button 21 is reset, and the pressing member 24 is reset.When the safety belt 300 is switched from the fastened state to the unfastened state, the hook portion 321 of the claw 32 moves in a direction to engage with the ratchet 31, the contact portion 322 separates from the second half arm 232, and the third elastic element 98 drives the second half arm 232 to rotate in the first direction S1 and drives the lock member 22 to the unlock position via the first half arm 231.

[0060] Referring to FIG. 8, in some embodiments, the hook portion 321 and the contact portion 322 are separate parts, and the second pivot portion 92 passes through both the hook portion 321 and the contact portion 322. The second elastic element 97 is a torsion spring. The torsion spring is disposed between the hook portion 321 and the contact portion 322 on the second pivot portion 92. The two spring arms of the torsion spring are respectively connected to the hook portion 321 and the contact portion 322. The torsion spring as the second elastic element 97 is configured to bias the hook portion 321 in a direction to engage with the ratchet 31 and bias the contact portion 322 in a direction away from the pivot arm 23. After the safety belt is switched to the fastened state, the hook portion 321 is pulled by the cable 42 so as to overcome the biasing force of the torsion spring, and thus the hook portion 321 moves away from the ratchet 31 and remains disengaged from the ratchet 31, and the contact portion 322 approaches the pivot arm 23 (the side contact wall 3221 of the contact portion 322 abuts against the end of the second half arm 232 of the pivot arm 23). As described above, after the drive button 21 is pressed, the second half arm 232 of the pivot arm 23 is lifted, and the contact portion 322 continues to approach the pivot arm 23 (the side contact wall 3221 of the contact portion 322 slides along the end of the second half arm 232 of the pivot arm 23) and can move to a position located on the downward rotation path of the second half arm 232 of the pivot arm 23. After the drive button 21 is pushed into a predetermined position, the limiting step 3222 of the contact portion 322 abuts against the pivot arm 23, and thus the second half arm 232 of the pivot arm 23 cannot rotate downward. In this case, the first half arm 231 of the pivot arm 23 moves downward, and the lock member 22 completes the locking under the action of the first elastic element 96.

[0061] Referring to FIG. 8, in some embodiments, the hook portion 321 includes a sleeve portion 3211. The second pivot portion 92 is passed through the sleeve portion 3211. The sleeve portion 3211 is passed through both the second elastic element 97 and the abutting portion 322. More specifically, the abutting portion 322 may include an annular pivot portion 3224. The sleeve portion 3211 is passed through the pivot portion 3224. Further, a first protrusion 3212 may be disposed on the hook portion 321. The first protrusion 3212 extends toward the abutting portion 322. A second protrusion 3223 may be disposed on the pivot portion 3224 of the abutting portion 322. The second protrusion 3223 abuts against the first protrusion 3212 under the action of the second elastic element 97. A third protrusion 261 may be disposed on the mounting rack 25 (see FIG. 7). The third protrusion 261 can abut against the side contact wall 3221 of the abutting portion 322 to restrict the abutting portion 322 from approaching the ratchet 31 too much.

[0062] Referring again to FIGS. 2, 3, 5, and 8, a display window 2020 may be provided in the seat housing 200. More specifically, the display window 2020 is disposed, for example, on the cover 202. The lock member 22 may further include a second support portion 222. The second support portion 222 is connected to the first support portion 221. An indicator 225 is disposed on the second support portion 222. The indicator 225 includes a first display area 2251 and a second display area 2252. When the lock member 22 is in the locked position, the first display area 2251 of the indicator 225 faces the display window 2020. In contrast, when the lock member 22 is in the unlocked position, the second display area 2252 of the indicator 225 faces the display window 2020. In this way, the position state of the lock member 22 can be easily known by observing the display of the indicator 225 in the display window 2020, and the user can be prompted to press the drive button 21 as needed. The first display area 2251 is displayed in, for example, green, and the second display area 2252 is displayed in, for example, red.

[0063] In other embodiments, the seat housing 200 may include a reminder device (not shown). The reminder device is configured to remind the user of the position state of the locking member 22. The reminder device may be attached to the display window 2020 or another suitable position, and may be a display screen and / or indicator light and / or buzzer, etc., and is configured to prompt the user to press the drive button by means of an audible reminder and / or a visual reminder. For example, after the first buckle 301 and the second buckle 302 are fastened to each other, the reminder device can continuously emit an audible / visual reminder if the user does not press the drive button 21. After the user presses the drive button 21, the audible / visual reminder stops. When the reminder device is attached to the cover 202, the reminder may be turned off by the movement of the second support portion 222. Further, a display prompting the user to press the drive button 21 after fastening the first buckle 301 and the second buckle 302 to each other may be attached to the seat housing 200.

[0064] In some embodiments, the reminder device is, for example, a display screen. For example, after the first buckle 301 and the second buckle 302 are fastened to each other, in order to remind the user to press the drive button 21, red is displayed on the display screen. After the user presses the drive button 21, green is displayed on the display screen. In some embodiments, in order to remind the user to press the drive button 21, an image depicting the movement of the finger pressing the drive button 21 may be displayed on the display screen.

[0065] One embodiment of the present application further provides a child safety seat including the safety belt adjustment system 100 as described above.

[0066] The technical features in the above embodiments can be randomly combined. For the sake of completeness of the description, not all possible combinations of the technical features in the above embodiments are described. However, all combinations of technical features should be regarded as being included within the scope of the description in this specification as long as they do not conflict with each other.

[0067] The above embodiments merely illustrate some embodiments of the present application. Although their descriptions are specific and detailed, they cannot be understood as limitations to the patent scope of the present application. Those skilled in the art should note that without departing from the concept of the present application, further modifications and improvements can be made, and all of them are included in the protection scope of the present application. Therefore, the patent protection scope of the present application should follow the appended patent claims.

Claims

1. A safety belt adjustment system for a child safety seat, comprising a retraction shaft and a retractor, wherein the retraction shaft is configured to be connected to a safety belt, and the retractor is an automatic retractor configured to drive the retraction shaft to perform a retraction rotation for retracting the safety belt in order to pull the fastened safety belt. A first locking device comprising a drive button and a locking member, wherein the drive button is configured to drive the retraction shaft to perform a release rotation for releasing the safety belt, and the locking member has a locking position, and in the locking position, the locking member locks the retraction rotation of the retraction shaft. A safety belt adjustment system comprising the above.

2. In the locking position, the locking member further locks the release rotation of the retraction shaft, and the locking member has an unlocking position for releasing the retraction shaft. When the safety belt is not fastened, the locking member is in the unlocking position. After the safety belt is fastened and pulled by the automatic retractor, when a pressing force is applied to the drive button to drive the retraction shaft to perform the release rotation, while the retraction shaft releases a safety belt of a predetermined length, the locking member switches from the unlocking position to the locking position. The safety belt adjustment system according to Claim 1.

3. The automatic retractor further comprises a support body configured to be attached to a seat housing of the child safety seat, and the retraction shaft and the retractor are attached on the support body. The drive button is configured to be attached to the seat housing. The safety belt adjustment system according to Claim 2.

4. The drive button comprises a pressing end and a contact end on the opposite side of the pressing end. When the pressing force is applied to the drive button, the contact end presses a portion of the safety belt that is not wound around the retraction shaft, and the safety belt is deformed by the force applied by the contact end, and drives the retraction shaft to perform the release rotation. The safety belt adjustment system according to Claim 3. Claim 5 After the locking member switches from the unlocking position to the locking position, the pressing force is removed, the drive button is reset, the locking member is held in the locking position, When the safety belt is switched from the fastened state to the unfastened state, the locking member switches from the locking position to the unlocking position. The safety belt adjustment system according to claim 4. Claim 6 Further comprising a second locking device, the second locking device comprising a ratchet, a pawl, and a second elastic element, The ratchet is connected to the retracting shaft, The pawl is pivotally connected to the support via a second pivot portion and is connected to a cable. When the safety belt is switched from the unfastened state to the fastened state, the pawl is pulled by the cable and rotates to disengage from the ratchet. When the safety belt is switched from the fastened state to the unfastened state, the pawl is driven by the second elastic element and rotates to engage with the ratchet to lock the retracting rotation of the retracting shaft. When the pawl disengages from the ratchet and the locking member switches to the locking position, the pawl can act on the locking member to hold the locking member in the locking position. When the pawl engages with the ratchet, the locking member can return to the unlocking position. The safety belt adjustment system according to claim 5. Claim 7 The second pivot portion supports the safety belt outside the retracting shaft, and the abutting end portion of the drive button is located between the retracting shaft and the second pivot portion. The safety belt adjustment system according to claim 6. Claim 8 The locking member comprises a first support portion and a locking pin portion. The first support portion is pivotally connected to the support via a first pivot portion. The first pivot portion is parallel to the retracting shaft. The locking pin portion is connected to the first support portion. The locking member rotates about the first pivot portion to switch between the locking position and the unlocking position, The support comprises a first groove. A locking gear is attached to the retracting shaft, and a second groove is formed between two adjacent teeth of the locking gear. When the lock member is in the locked position, the lock pin portion fits into the first groove and the second groove aligned with the first groove. When the lock member is in the unlocked position, the lock pin portion is separated from the first groove and the second groove. The safety belt adjustment system according to claim 7.

9. The first locking device further includes a first elastic member, a third elastic member, a pivot arm, and a pressing member. The first elastic element applies a first torque to the lock member so as to rotate the lock member toward the locked position. A central portion of the pivot arm is pivotally connected to the support through a third pivot portion. The third pivot portion is parallel to the first pivot portion. A first half arm of the pivot arm abuts against the first support portion. The third elastic member drives the pivot arm to rotate in a first direction about the third pivot portion. Thereby, the first half arm applies a second torque to the first support portion so as to rotate the lock member toward the unlocked position. The pressing member is connected to the drive button. When the pressing force is applied to the drive button, the pressing member presses a second half arm of the pivot arm until the second half arm abuts against the claw, and rotates the pivot arm about the third pivot portion in a second direction opposite to the first direction. The safety belt adjustment system according to claim 8.

10. The claw includes a hook portion and a contact portion. The hook portion is connected to the cable and is configured to engage with the ratchet. The extending direction of the contact portion is opposite to the extending direction of the hook portion. The contact portion abuts against the second half arm and is configured to limit the rotation of the pivot arm in the first direction. The safety belt adjustment system according to claim 9.

11. The contact portion includes a side contact wall and a limiting step at an end of the side contact wall. When the claw is separated from the ratchet and the pivot arm rotates in the second direction, an end portion of the second half arm abuts against the side contact wall until the end portion of the second half arm passes the side contact wall and abuts against the limiting step. The safety belt adjustment system according to claim 10.

12. The hook portion and the abutting portion are separate components, and the second pivot portion passes through the hook portion and the abutting portion. The second elastic element is a torsion spring, and the second pivot portion passes through the torsion spring located between the hook portion and the abutting portion. Two spring arms of the torsion spring are respectively connected to the hook portion and the abutting portion. The safety belt adjustment system according to claim 11.

13. The first locking device further includes a mounting rack connected to the support. The central portion of the pressing member is pivotally connected to the mounting rack via a fourth pivot portion. The fourth pivot portion is perpendicular to the retracting shaft. The first end of the pressing member is bent and connected to the drive button. When the pressing force is applied to the drive button, the drive button drives the pressing member to rotate about the fourth pivot portion. Therefore, the second end of the pressing member presses the second half arm. The safety belt adjustment system according to claim 9.

14. The pressing member is made of an elastically deformable metal rod. The central portion of the metal rod forms a ring that can be wound around the fourth pivot portion. The safety belt adjustment system according to claim 13.

15. The mounting rack is connected to the support via the second pivot portion. A rotation stopper structure configured to limit the rotation of the mounting rack about the second pivot portion is disposed between the mounting rack and the support. The safety belt adjustment system according to claim 13.

16. The second pivot portion further passes through a shaft sleeve. The safety belt adjustment system according to claim 15.

17. The mounting rack includes a first frame and a second frame disposed opposite to each other, and a third frame connected between the first frame and the second frame. The second pivot portion extends through the first frame and the second frame. The safety belt passes between the second pivot portion and the third frame. The third frame includes a hinge base protruding outward. The fourth pivot portion is connected to the hinge base. The safety belt adjustment system according to claim 15.

18. The rotation stopper structure includes a limiting recess disposed in the first frame and the second frame, and a connection lug disposed on the support body. The connection lugs are respectively fitted into the limiting recesses, and the second pivot portion extends through the limiting recesses and the connection lugs. The safety belt adjustment system according to claim 17.

19. The seat housing includes a display window. The locking member further includes a second support portion. The second support portion is connected to the first support portion, and an indicator is disposed on the second support portion. The indicator includes a first display area and a second display area. When the locking member is in the locked position, the first display area of the indicator faces the display window. When the locking member is in the unlocked position, the second display area of the indicator faces the display window. The safety belt adjustment system according to claim 8.

20. The seat housing includes a reminder device configured to remind the position state of the locking member. The safety belt adjustment system according to claim 8.

21. The reminder device includes an audible reminder and / or a visual reminder. The safety belt adjustment system according to claim 20.

22. The support body includes a first side wall and a second side wall facing the first side wall. A first end of the retraction shaft extends through the first side wall, and a second end of the retraction shaft extends through the second side wall. The ratchet is attached to the first end of the retraction shaft, and the retractor is attached to the second end of the retraction shaft. The pivot arm is pivotally connected to the first side wall via the third pivot portion. The pivot arm is disposed outside the first side wall. Two locking gears are provided. One of the two locking gears is near the inside of the first side wall, and the other of the two locking gears is near the inside of the second side wall. The length of the locking pin portion reaches the first side wall and the second side wall, and each of the first side wall and the second side wall includes the first groove. The safety belt adjustment system according to claim 10.

23. The seat housing includes a seat portion, the seat portion includes a cavity for accommodating the support, a cover is attached to the upper part of the cavity, the drive button is attached to the cover, and a reset spring is attached between the cover and the drive button. The safety belt adjustment system according to claim 5.

24. The safety belt adjustment system further includes a tension mechanism including the cable. When the safety belt is switched from the unfastened state to the fastened state, the tension mechanism drives the claw via the cable to release it from the ratchet. The safety belt adjustment system according to claim 6.

25. The safety belt includes a first buckle. The safety belt adjustment system further includes a crotch belt including a second buckle. The tension mechanism includes a rod member, the cable, and a fourth elastic member. The rod member and the fourth elastic member are attached to the second buckle. The fourth elastic member drives the rod member so that a first end portion of the rod member can protrude from the second buckle. A second end portion of the rod member is connected to a first end portion of the cable, and a second end portion of the cable is connected to the claw. When the first buckle and the second buckle are fastened to each other, the rod member is pushed by the first buckle and retracts into the second buckle, thereby driving the cable to pull the claw. The safety belt adjustment system according to claim 24.

26. A child safety seat including the safety belt adjustment system according to any one of claims 1 to 25.

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