Shoulder belt width adjusting mechanism and child safety seat

Abstract

To provide a shoulder belt width adjusting mechanism.SOLUTION: A shoulder belt width adjustment mechanism includes a rail device and a shoulder belt fixing member, where the rail device is provided on a seat backrest and includes a first and second rails on both sides of the seat backrest, lateral distance between the first rail and the second rail gradually changes in a longitudinal direction, and the two shoulder belt fixing members can respectively slide along the first and second rails of the rail device in the longitudinal direction. A first end of the shoulder belt fixing member is laterally slidably inserted into a corresponding hole of a seat headrest, a second end is longitudinally slidably connected to a corresponding rail of the first and second rails, the shoulder belt fixing member has a telescopic structure, lateral length thereof can be changed in a process of longitudinally sliding up and down, and a shoulder belt accommodating portion is laterally slid in the process of longitudinally sliding the seat headrest to synchronously adjust shoulder belt width.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a shoulder belt width adjustment mechanism and a child safety seat for a vehicle, and the child safety seat is provided with a shoulder belt width adjustment mechanism.

Background Art

[0002] A child safety seat is a device designed for children of different weights or age groups. The child is strapped into the safety seat during a vehicle ride, and when the vehicle collides or decelerates suddenly, the impact force on the child can be reduced, the movement of the child's body can be restricted, thereby reducing the injury to them and effectively enhancing the safety of the child's vehicle ride.

[0003] Currently, many commercially available child safety seats are equipped with a headrest height adjustment function. For example, Patent Document CN21164126U proposes a headrest height adjustment mechanism including a backrest having a plurality of locking grooves, a headrest assembly movably provided on the backrest, and an adjustment member. The headrest assembly is provided with a position locking lever movably installed in a position locking groove. The position locking lever can lock in different position locking grooves to adjust the height of the headrest assembly relative to the backrest. The adjustment member is provided on the headrest assembly to drive the locking lever, and an elastic member is provided between the adjustment member and the headrest assembly.

[0004] In addition, Patent Document CN2101399U also discloses a headrest height adjustment device including a headrest, a seat backrest, a fastener, an adjustment member, and a reset member. One end of the fastener is a fastener end, and the other end has a first inclined surface. The adjustment member has a second inclined surface and a first locking portion. One end of the adjustment member away from the second inclined surface is rotatably connected to the headrest, and a reset member is connected between the adjustment member and the headrest. The second inclined surface and the first inclined surface are in abutting fit, and several second locking portions are provided in the height direction of the seat backrest. The adjustment member has a fixed position. When the adjustment member is in the fixed position, the first locking portion and the second locking portion are engaged, and the space between the headrest and the seat backrest is relatively fixed.

[0005] However, in the above-mentioned Chilean safety seat, although the height of the headrest can be adjusted to meet the needs of children with different heights and body types, the width of the shoulder belt cannot be adjusted during the process of adjusting the height of the headrest. Generally, since the shoulder widths of children with different heights and body types are also different, if the width of the shoulder belt is not adjusted in accordance with the adjustment of the height of the headrest, the comfort level when using the child safety seat will decrease, so children will not want to ride in the child safety seat.

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, an object of the present invention is to provide a shoulder belt width adjustment mechanism and a child safety seat capable of synchronously adjusting the shoulder belt width during the process of adjusting the height of the headrest and meeting the requirements for the shoulder belt widths of children of different ages and different body types.

Means for Solving the Problems

[0007] In contrast, the present invention provides a shoulder belt width adjustment mechanism including a rail device and two shoulder belt fixing members. The rail device is provided on a seat backrest and includes a first rail and a second rail extending substantially in the longitudinal direction on both sides of the seat backrest. The lateral distance between the first rail and the second rail gradually changes in the longitudinal direction. The two shoulder belt fixing members are connected to the seat headrest, are located between the seat headrest and the seat backrest, and can slide along the first rail and the second rail of the rail device respectively.

[0008] Preferably, each of the shoulder belt fixing members includes a first end, a second end, and a shoulder belt accommodating portion located between the first end and the second end. The first end is slidably inserted laterally into a hole corresponding to the seat headrest, and the second end is slidably connected longitudinally to a corresponding rail in the longitudinal direction.

[0009] Both the first rail and the second rail are in the shape of a long groove and have a certain cross-sectional shape. A slider is provided at the second end of the shoulder belt fixing member, and the slider fits into the long groove.

[0010] Both the first rail and the second rail are rod-shaped and have a certain cross-sectional shape. Therefore, a slide slot portion is provided at the second end of the shoulder belt fixing member, and the slide slot portion fits onto the rod.

[0011] Each of the shoulder belt fixing members includes a shoulder belt accommodating portion, and a first member and a second member that can be interconnected in a telescopic manner. The first member is slidably inserted laterally into a hole corresponding to the seat headrest, the second member is slidably connected longitudinally to a corresponding rail, and the shoulder belt accommodating portion is fixed to the second member.

[0012] Preferably, the first rail and the second rail are provided symmetrically with respect to the central axis of the seat backrest.

[0013] The present invention also provides a child safety seat for a vehicle, the child safety seat comprising a pedestal, a seat case, a seat headrest, and a shoulder belt width adjustment mechanism. The pedestal is connected to the seat of the vehicle. The seat case includes a seat backrest and a seat bottom. The seat bottom is connected to the pedestal. Two shoulder belt holes for the shoulder belt to pass through are provided laterally in the seat backrest. The seat headrest is slidably connected vertically to the upper part of the seat backrest for arranging a child's head. The shoulder belt width adjustment mechanism is attached to the seat backrest, whereby the lateral distance between the shoulder belt holes changes according to the sliding of the seat headrest on the seat backrest.

[0014] Preferably, the lateral distance between the two shoulder belt holes increases as the distance between the seat headrest and the seat bottom increases, and decreases as the distance between the seat headrest and the seat bottom decreases.

[0015] The child safety seat of the present invention further comprises an engagement lever, which is used to position the seat headrest on the seat case.

[0016] According to the shoulder belt width adjustment mechanism of the present invention and the child safety seat including the shoulder belt width adjustment mechanism, it is possible to realize synchronous adjustment of the shoulder belt width simultaneously with the height adjustment of the headrest, thereby solving the requirements for the shoulder belt width of children of different ages and body types, and extremely enhancing the comfort and safety of the child safety seat.

[0017] Those skilled in the art will understand that the drawings are mainly used for the purpose of illustration and are not intended to limit the scope of the subject matter of the invention described in this specification. The drawings are not necessarily drawn to scale, and in some cases, various aspects of the subject matter of the invention disclosed in this specification can be exaggerated or enlarged in the drawings for the understanding of different features. In the drawings, the same reference numerals generally refer to the same features (e.g., elements that are functionally similar and / or structurally similar).

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0019] The drawings and exemplary embodiments described below do not mean to limit the scope of this embodiment to a single embodiment. The embodiments can be realized by exchanging some or all of the elements described or illustrated. Further, when some elements of the disclosed exemplary embodiments can be implemented partially or entirely using known components, in some cases, only some of such known components necessary for understanding this embodiment are described, and detailed descriptions of other parts of these known components are omitted so as not to obscure this embodiment.

[0020] As shown in FIG. 1, this figure is a schematic diagram of the child safety seat 1 in the present invention. This child safety seat 1 mainly includes a pedestal 10, a seat case 20, and a seat headrest 30. The pedestal 10 can be connected and fixed to, for example, the seat of an automobile to fix this child safety seat 1. The seat case 20 constitutes the main structure of the child safety seat 1 and includes a seat backrest 22 and a seat bottom 24. The seat backrest 22 and the seat bottom 24 together constitute a riding space for a child. The headrest 30 is connected to the seat backrest 22, and the head of the child using the child safety seat 1 can lean on this headrest 30, which can enhance comfort. Also, the headrest 30 is slidable longitudinally along the seat backrest 22, and the longitudinal distance between the headrest 30 and the seat bottom 24 can be adjusted. Thereby, the needs of children of different ages and different body types can be satisfied, and the comfort of riding on the child safety seat 1 can be enhanced. Further, in the child safety seat 1 of this embodiment, two left and right shoulder belt holes 220 provided along the lateral direction of the seat backrest 22 are provided for restraining the child safety seat 1, and the seat belt of the child safety seat can be passed through the two shoulder belt holes. Preferably, the two shoulder belt holes 220 are symmetrically distributed with respect to the longitudinal center line of the seat backrest 22.

[0021] The child safety seat 1 of the present invention further includes a shoulder belt width adjustment mechanism 40 so that the horizontal distance between the shoulder belt holes 220 can be changed accordingly while the headrest 30 slides vertically up and down along the seat backrest 22. For example, as shown in FIGS. 2 and 3 of the present application respectively, when the headrest 30 is in an upper position relative to the seat backrest 22 (shown in FIG. 2), the horizontal distance between the shoulder belt holes 220 is, for example, 70 mm. In FIG. 3, when the headrest 30 slides downward in the vertical direction of the seat backrest 22 to shorten the distance between the headrest 30 and the seat bottom 24, the horizontal distance between the two shoulder belt holes 220 changes accordingly to, for example, 50 mm. In this way, for children of different ages and body types, by adjusting the height of the headrest 30 and the width of the shoulder belt, the riding comfort and safety are improved.

[0022] As shown in FIG. 4, the child safety seat 1 of the present invention further includes an engagement lever 50 for positioning the headrest 30 in the seat case 20, that is, when the headrest 30 slides to an appropriate position in the vertical direction, the engagement lever 50 fixes and positions the headrest 30 in the seat case 20.

[0023] Next, with reference to FIGS. 5 to 7, the specific configuration of the shoulder belt width adjustment mechanism 40 in the present invention will be specifically described. Here, FIGS. 5 and 6 are schematic diagrams of different configurations of the shoulder belt width adjustment mechanism according to the present invention, and FIG. 7 is a schematic diagram of the shoulder belt fixing member according to the present invention. The shoulder belt width adjustment mechanism 40 mainly includes a rail device 44 including a first rail 441 and a second rail 442 respectively arranged on both sides of the seat backrest 22, and two shoulder belt fixing members 42. Preferably, the first rail 441 and the second rail 442 are distributed symmetrically about the vertical center line of the seat backrest 22. And the horizontal distance between the first rail 441 and the second rail 442 gradually increases in the direction away from the seat bottom 24.

[0024] A specific configuration example of the shoulder belt fixing member 42 is shown in FIG. 7. Referring to FIGS. 6 and 7, each shoulder belt fixing member 42 includes a first end 421 and a second end 422 that face each other, and a shoulder belt accommodating portion 423 located between the first end 421 and the second end 422. The shoulder belt of the child safety seat can be fixedly connected to this shoulder belt accommodating portion 423. Here, the first end 421 is inserted laterally into the hole 32 of the headrest 30. The length of the first end 421 inserted into the hole 32 changes according to the vertical slide of the shoulder belt fixing member 42. For example, during the process of the shoulder belt fixing member 42 sliding vertically away from the seat bottom 24, the length of the first end 421 inserted into the hole 32 gradually decreases. Conversely, during the process of the shoulder belt fixing member 42 sliding vertically closer to the seat bottom 24, the length of the first end 421 inserted into the hole 32 gradually increases. The second end 422 of the shoulder belt fixing member 42 is connected to the rail so as to be slidable vertically. For example, in FIG. 6, the second end 422 of the shoulder belt fixing member 42 provided on the left side of the seat backrest 22 is slidably provided on the first rail 441, and the second end 422 of the shoulder belt fixing member provided on the right side of the seat backrest 22 is slidably provided on the second rail 442. Also, the two first ends 421 of the two shoulder belt fixing members 42 on both the left and right sides are inserted into the two holes 32 of the headrest 30. Thus, during the process of the headrest 30 sliding vertically up and down, since the first end of the shoulder belt fixing member 42 is inserted into the hole 32 of the headrest 30, it can slide together with the headrest. On the other hand, the second end 422 of the shoulder belt fixing member 42 can slide along the first rail 441 and the second rail 442. Since the horizontal distance between the first rail 441 and the second rail 442 gradually increases in the direction away from the seat bottom 24, the horizontal distance between the two shoulder belt fixing members 42 also gradually increases in the direction away from the seat bottom 24 and gradually decreases in the direction approaching the seat bottom 24 accordingly.

[0025] As a modification example of the shoulder belt fixing member 42, the shoulder belt fixing member 42 can have a structure that is stretchable, for example, the lateral length thereof increases during the process of sliding upward, and the lateral length thereof decreases during the process of sliding downward. For example, the shoulder belt fixing member 42 in the present embodiment includes a shoulder belt accommodating portion 423 for fixing the shoulder belt, and a first member and a second member that can be interconnected in a stretchable manner. The first member is inserted into a hole 32 corresponding to the seat headrest so as to be slidable in the lateral direction, the second member is connected to a corresponding rail so as to be slidable in the longitudinal direction, and the shoulder belt accommodating portion 423 is fixed to the second member. Thereby, as the shoulder belt fixing member slides vertically in the vertical direction, a relative stretching and contracting movement is performed between the first member and the second member, so that the lateral distance between the two shoulder belt fixing members can be gradually changed as it moves in the vertical direction.

[0026] According to an embodiment of the present invention, for example, both the first rail 441 and the second rail 442 are in the shape of a long groove, the long groove-shaped rail has a certain cross-sectional shape, and accordingly, a slider 4221 is provided at the second end 422 of the shoulder belt fixing member 42, and the slider 4221 can be fitted and slid in the long groove.

[0027] According to another embodiment of the present invention, for example, both the first rail 441 and the second rail 442 are in the shape of a rod, the rod-shaped rail has a certain cross-sectional shape, and therefore, a slide slot portion that can be fitted and slid on the rod is provided at the second end 422 of the shoulder belt fixing member 42.

[0028] The following inventions are also disclosed in this specification.

[0029] [1] A shoulder belt width adjustment mechanism (40) including a rail device (44) and two shoulder belt fixing members (42), The rail device (44) is provided on the seat backrest (22) and includes a first rail (441) and a second rail (442) that extend substantially longitudinally on both sides of the seat backrest (22). The lateral distance between the first rail (441) and the second rail (442) gradually changes in the longitudinal direction. The two shoulder belt fixing members (42) are connected to the seat headrest (30), are located between the seat headrest (30) and the seat backrest (22), and can slide longitudinally along the first rail (441) and the second rail (442) of the rail device (44), respectively. Each of the shoulder belt fixing members (42) includes a shoulder belt accommodating portion (423) located between a first end and a second end of the shoulder belt fixing member (42). A shoulder belt can be fixedly connected to the shoulder belt accommodating portion (423). The first end of the shoulder belt fixing member (42) is slidably inserted laterally into the corresponding hole (32) of the seat headrest. The direction in which the first end of the shoulder belt fixing member (42) is inserted into the hole (32) is the same as the lateral direction. The second end of the shoulder belt fixing member (42) is slidably connected longitudinally to the corresponding rail of the first and second rails. The shoulder belt fixing member (42) has a telescopic structure, and its lateral length can change during the up-and-down sliding in the longitudinal direction. During the process of the seat headrest (30) sliding longitudinally, the shoulder belt accommodating portion (423) slides laterally, and the shoulder belt width is synchronously adjusted. This is a characteristic of the shoulder belt width adjustment mechanism.

[0030] [2] The shoulder belt fixing member (42) includes a first member and a second member that can be telescopically interconnected. The shoulder belt accommodating portion (423) is located between the first member and the second member. This is a characteristic of the shoulder belt width adjustment mechanism according to [1].

[0031] [3] The end of the first member is the first end, the end of the second member is the second end, and the shoulder belt accommodating portion is fixed to the second member. The shoulder belt width adjustment mechanism according to [2], characterized in that.

[0032] [4] Both the first rail and the second rail are in the shape of long grooves, have a certain cross-sectional shape, a slider (4221) is provided at the second end (422) of the shoulder belt fixing member (42), and the slider (4221) fits into the long groove. The shoulder belt width adjustment mechanism according to [1], characterized in that.

[0033] [5] Both the first rail and the second rail are rod-shaped, have a certain cross-sectional shape, a slide slot portion is provided at the second end (422) of the shoulder belt fixing member (42), and the slide slot portion fits onto the rod. The shoulder belt width adjustment mechanism according to [1], characterized in that.

[0034] [6] The first rail (441) and the second rail (442) are provided symmetrically with respect to the central axis of the seat backrest (22). The shoulder belt width adjustment mechanism according to [1], characterized in that.

[0035] [7] A shoulder belt width adjustment mechanism (40) comprising a rail device (44) and two shoulder belt fixing members (42), The rail device (44) is provided on the seat backrest (22), and includes a first rail (441) and a second rail (442) extending substantially in the vertical direction on both sides of the seat backrest (22), and the horizontal distance between the first rail (441) and the second rail (442) gradually changes in the vertical direction. The two shoulder belt fixing members (42) are connected to the seat headrest (30), are located between the seat headrest (30) and the seat backrest (22), and can slide vertically along the first rail (441) and the second rail (442) of the rail device (44) respectively. Each of the shoulder belt fixing members (42) includes a shoulder belt accommodating portion (423) located between a first end portion and a second end portion of the shoulder belt fixing member (42). A shoulder belt can be fixedly connected to the shoulder belt accommodating portion (423). The first end portion of the shoulder belt fixing member (42) is inserted into the corresponding hole (32) of the seat headrest in a slidable manner in the lateral direction, and the direction in which the first end portion of the shoulder belt fixing member (42) is inserted into the hole (32) is the same as the lateral direction. The second end portion of the shoulder belt fixing member (42) is slidably connected to the corresponding rail among the first and second rails in the longitudinal direction. The length of the first end (421) which is the first end portion inserted into the hole (32) changes due to the slide in the lateral direction. During the process of the seat headrest (30) sliding in the longitudinal direction, the shoulder belt accommodating portion (423) slides in the lateral direction, and the shoulder belt width is synchronously adjusted. A shoulder belt width adjustment mechanism characterized by this.

[0036] [8] Both the first rail and the second rail are in the shape of a long groove and have a certain cross-sectional shape. A slider (4221) is provided at the second end (422) of the shoulder belt fixing member (42), and the slider (4221) fits into the long groove. The shoulder belt width adjustment mechanism according to [7], characterized by this.

[0037] [9] Both the first rail and the second rail are rod-shaped and have a certain cross-sectional shape. A slide slot portion is provided at the second end (422) of the shoulder belt fixing member (42), and the slide slot portion fits into the rod. The shoulder belt width adjustment mechanism according to [7], characterized by this.

[0038]

[10] A child safety seat (1) for a vehicle, comprising a pedestal (10), a seat case (20), a seat headrest (30), and the shoulder belt width adjustment mechanism (40) according to any one of claims 1 to 9. The seat case (20) includes a seat backrest (22) and a seat bottom (24). The seat bottom (24) is connected to the pedestal (10). Two shoulder belt holes (220) for the shoulder belts to pass through are provided horizontally in the seat backrest (22). The seat headrest (30) is connected to the upper part of the seat backrest (22) so as to be slidable vertically. The shoulder belt width adjustment mechanism (40) is attached to the seat backrest (22), and the width of the shoulder belt fixedly connected to the two shoulder belt holes (220) changes according to the sliding of the seat headrest (30) on the seat backrest (22). A child safety seat characterized by this.

[0039]

[11] The width of the shoulder belt increases as the distance between the seat headrest (30) and the seat bottom (24) increases, and decreases as the distance between the seat headrest (30) and the seat bottom (24) decreases. The child safety seat according to

[10] , characterized by this.

[0040]

[12] Further comprising an engagement lever (50), the engagement lever (50) is used to position the seat headrest (30) on the seat case (20). The child safety seat according to

[10] , characterized by this.

[0041] According to the shoulder belt width adjustment mechanism 40 of the present invention and the child safety seat 1 including the shoulder belt width adjustment mechanism 40, it is possible to realize synchronous adjustment of the shoulder belt width simultaneously with the height adjustment of the headrest 30, thereby solving the requirements for the shoulder belt width of children of different ages and body types, and the comfort and safety of the child safety seat 1 can be extremely improved.

[0042] The specification of the present application describes various features by its preferred exemplary embodiments. Those skilled in the art can make many other embodiments, modifications and variations that accompany the scope and spirit of the claims by reading this specification.

Explanation of reference numerals

[0043] 1 Child safety seat 10 Pedestal 20 Seat case 22 Seat backrest 220 Shoulder belt holes 24 Seat bottom 30 Seat headrest 32 Hole 40 Shoulder belt width adjustment mechanism 44 Rail device 441 First rail 442 Second rail 42 Shoulder belt fixing member 421 First end 422 Second end 423 Shoulder belt storage part 4221 Slider 50 Engagement lever

Claims

1. A shoulder belt width adjustment mechanism (40) comprising a rail device (44) and two shoulder belt fixing members (42), The rail device (44) is provided on the seat backrest (22) and includes a first rail (441) and a second rail (442) that are provided on both sides of the seat backrest (22) and extend in a substantially vertical direction, and a lateral distance between the first rail (441) and the second rail (442) gradually changes in the vertical direction; the two shoulder belt fixing members (42) are connected to a seat headrest (30), are located between the seat headrest (30) and the seat backrest (22), and can slide vertically along a first rail (441) and a second rail (442) of the rail device (44), respectively; Each of the shoulder belt fixing members (42) includes a shoulder belt receiving portion (423) located between a first end and a second end of the shoulder belt fixing member (42); A shoulder belt can be fixedly connected to the shoulder belt receiving portion (423), a first end of the shoulder belt fixing member (42) is slidably inserted into the corresponding hole (32) of the seat headrest in a transverse direction, and the direction in which the first end of the shoulder belt fixing member (42) is inserted into the hole (32) is the same as the transverse direction; and a second end of the shoulder belt fixing member (42) is connected to a corresponding one of the first and second rails in a longitudinal direction, The shoulder belt fixing member (42) has an expandable structure, and its horizontal length can be changed in the process of sliding up and down in the vertical direction, In the process of sliding the seat headrest (30) in the vertical direction, the shoulder belt storage portion (423) slides in the horizontal direction, and the shoulder belt width is synchronously adjusted. A shoulder belt width adjustment mechanism.

2. The shoulder belt fixing member (42) comprises a first member and a second member which are elastically connectable to each other, and the shoulder belt receiving portion (423) is located between the first member and the second member.

2. The shoulder belt width adjustment mechanism according to claim 1 .

3. An end of the first member is the first end, an end of the second member is the second end, and the shoulder belt receiving portion is fixed to the second member.

3. The shoulder belt width adjustment mechanism according to claim 2.

4. The first rail and the second rail are both long-groove shaped and have a constant cross-sectional shape, and a slider (4221) is provided at the second end (422) of the shoulder belt fixing member (42), and the slider (4221) fits into the long groove.

2. The shoulder belt width adjustment mechanism according to claim 1 .

5. The first rail and the second rail are both rod-shaped and have a certain cross-sectional shape, and a slide slot portion is provided at the second end (422) of the shoulder belt fixing member (42), and the slide slot portion fits into the rod.

2. The shoulder belt width adjustment mechanism according to claim 1 .

6. The first rail (441) and the second rail (442) are provided symmetrically with respect to the central axis of the seat backrest (22).

2. The shoulder belt width adjustment mechanism according to claim 1 .

7. A shoulder belt width adjustment mechanism (40) comprising a rail device (44) and two shoulder belt fixing members (42), The rail device (44) is provided on the seat backrest (22) and includes a first rail (441) and a second rail (442) that are provided on both sides of the seat backrest (22) and extend in a substantially vertical direction, and a lateral distance between the first rail (441) and the second rail (442) gradually changes in the vertical direction; the two shoulder belt fixing members (42) are connected to a seat headrest (30), are located between the seat headrest (30) and the seat backrest (22), and can slide vertically along a first rail (441) and a second rail (442) of the rail device (44), respectively; Each of the shoulder belt fixing members (42) includes a shoulder belt receiving portion (423) located between a first end and a second end of the shoulder belt fixing member (42); A shoulder belt can be fixedly connected to the shoulder belt receiving portion (423), a first end of the shoulder belt fixing member (42) is slidably inserted into the corresponding hole (32) of the seat headrest in a transverse direction, and the direction in which the first end of the shoulder belt fixing member (42) is inserted into the hole (32) is the same as the transverse direction; and a second end of the shoulder belt fixing member (42) is connected to a corresponding one of the first and second rails in a longitudinal direction, The length of the first end (421) inserted into the hole (32) is changed by sliding in the lateral direction, In the process of sliding the seat headrest (30) in the vertical direction, the shoulder belt storage portion (423) slides in the horizontal direction, and the shoulder belt width is synchronously adjusted. A shoulder belt width adjustment mechanism.

8. The first rail and the second rail are both long-groove shaped and have a constant cross-sectional shape, and a slider (4221) is provided at the second end (422) of the shoulder belt fixing member (42), and the slider (4221) fits into the long groove.

8. The shoulder belt width adjustment mechanism according to claim 7.

9. The first rail and the second rail are both rod-shaped and have a certain cross-sectional shape, and a slide slot portion is provided at the second end (422) of the shoulder belt fixing member (42), and the slide slot portion fits into the rod.

8. The shoulder belt width adjustment mechanism according to claim 7.

10. A child safety seat (1) for a vehicle, comprising a base (10), a seat case (20), a seat headrest (30), and the shoulder belt width adjustment mechanism (40) according to any one of claims 1 to 9, The seat case (20) includes a seat backrest (22) and a seat bottom (24), the seat bottom (24) is connected to the base (10), and the seat backrest (22) is provided with two shoulder belt holes (220) in the lateral direction for a shoulder belt to pass through. The seat headrest (30) is connected to an upper portion of the seat backrest (22) so as to be vertically slidable; The shoulder belt width adjustment mechanism (40) is attached to the seat backrest (22), and the width of the shoulder belt fixedly connected to the two shoulder belt holes (220) changes according to the sliding of the seat headrest (30) toward the seat backrest (22). A child safety seat characterized by the above.

11. the width of the shoulder belt increases as the distance between the seat headrest (30) and the seat bottom (24) increases and decreases as the distance between the seat headrest (30) and the seat bottom (24) decreases; 11. A child safety seat as claimed in claim 10.

12. The seat further includes an engagement lever (50), the engagement lever (50) being used to position the seat headrest (30) in the seat case (20).

11. A child safety seat as claimed in claim 10.

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