Child carrier

Abstract

The utility model relates to a carrier for children. The child carrier comprises a frame (1), a seat part (2), a backrest (3) and a backrest adjusting device (4). The backrest adjusting device is used for adjusting the angle of the backrest (3) relative to the seat part (2). The backrest adjustment device (4) comprises: a locking mechanism (42) provided on the backrest (3); and the bridle assembly (41) is connected to the frame (1) of the child carrier and has an adjustable supporting length. The binding belt assembly (41) comprises a clamping part (4121) and a non-clamping part (4122). The engageable portion (4121) is configured to engage with the locking mechanism (42) to unidirectionally lock the strap assembly (41) at a desired bearing length. The non-engageable portion (4122) is configured to be in sliding fit with the locking mechanism (42) so that the non-engageable portion (4122) can penetrate through the locking mechanism (42) in a bidirectional sliding mode relative to the locking mechanism (42).

Description

Technical Field

[0001] The utility model relates to the technical field of children's appliances, in particular to a backrest adjusting device capable of adjusting a backrest angle and a children's carrier with the backrest adjusting device. Background Art

[0002] A child carrier is usually provided with a backrest adjustment device such as a belt-type adjustment mechanism to adjust the angle of the backrest relative to the seat. In particular, the belt-type adjustment mechanism adjusts the length of the belt to achieve infinite adjustment of the angle between the backrest and the seat. Existing belt-type adjustment mechanisms generally have the following problems: the locking effect of the belt-type adjustment mechanism is poor and it is easy to fail; the belt-type adjustment mechanism cannot avoid the lying angle range for adjustment, so when the backrest angle is adjusted in the lying angle range, it is easy to tilt, causing safety hazards. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a backrest adjustment device capable of adjusting the angle of a backrest relative to a seat and a child carrier having the backrest adjustment device.

[0004] The first aspect of the utility model provides a backrest adjustment device. The backrest adjustment device is used to adjust the angle of the backrest of the child carrier relative to the seat of the child carrier. The backrest adjustment device includes: a locking mechanism and a belt assembly. The locking mechanism is arranged on the backrest. The belt assembly is connected to the frame of the child carrier and has an adjustable supporting length, and the belt assembly is provided with a snap-fit ​​portion and a non-snap-fit ​​portion. Wherein, the locking mechanism is configured to snap-fit ​​with the snap-fit ​​portion to unidirectionally lock the belt assembly at a desired supporting length, and the non-snap-fit ​​portion is configured to slidably cooperate with the locking mechanism so that the non-snap-fit ​​portion can slide through the locking mechanism in both directions relative to the locking mechanism.

[0005] In a first aspect of the present invention, the strap assembly comprises: a strap extending from the frame through the locking mechanism provided on the backrest to limit the supporting length of the strap assembly; and an adjustment strap attached to the strap, at least one of the snap-fit ​​portion and the non-snap-fit ​​portion being arranged on the adjustment strap.

[0006] In the first aspect of the present utility model, the locking mechanism includes a stopper having a hook end, and the engageable portion includes a plurality of engaging protrusions configured to be unidirectionally engaged with the hook end.

[0007] In the first aspect of the present utility model, the strap assembly further comprises a pull ring connected to the adjustment strap or the strap.

[0008] In the first aspect of the present invention, the strap has a free end and at least two fixed ends, the at least two fixed ends are respectively connected to the frame on opposite sides of the backrest in the horizontal direction, and the free end is movable relative to the locking mechanism to adjust the supporting length of the strap assembly.

[0009] In the first aspect of the utility model, the backrest adjustment device also includes a guide member, which is arranged on the backrest, and the guide member has at least two guide bevels, and the at least two fixed ends respectively pass through the corresponding guide bevels of the at least two guide bevels, and are connected to the frame on the opposite sides of the backrest.

[0010] In a first aspect of the utility model, the locking mechanism comprises: a stopper, which is pivotally arranged on the locking mechanism and has a stopper portion, at least a portion of the strap assembly passes through the locking mechanism via the stopper stopper portion, and the stopper is configured to be switchable between a locking position and a release position. When the stopper is in the locking position, the stopper portion engages with the engageable portion to unidirectionally lock the strap assembly at the required support length, or slidably cooperates with the non-engageable portion. When the stopper is in the release position, the unidirectional movement restriction of the strap assembly by the stopper portion is released.

[0011] In the first aspect of the utility model, the locking mechanism further comprises: a support, which is arranged on the backrest. The stopper is pivotally connected to the support, and the at least a portion of the belt assembly passes through the locking mechanism between the support and the stopper.

[0012] In the first aspect of the utility model, the locking mechanism further comprises: a fixing seat fixedly connected to the backrest, the fixing seat having a receiving cavity with an opening facing the backrest; a support seat received in the receiving cavity via the opening and connected to the backrest through the fixing seat. A portion of the stopper is located in the receiving cavity and is pivotally connected to the support seat, and at least a portion of the strap assembly passes through the locking mechanism between the support seat and the bottom wall of the receiving cavity.

[0013] In the first aspect of the utility model, the bottom wall of the accommodating cavity is provided with a first through hole, and another part of the stopper passes through the first through hole and extends out of the accommodating cavity.

[0014] In the first aspect of the utility model, the fixing seat is provided with a second through hole for the belt assembly to pass through, the second through hole passes through two opposite side walls of the accommodating cavity, and the at least a portion of the belt assembly passes through the second through hole.

[0015] In the first aspect of the present invention, the locking mechanism further comprises: a biasing member disposed between the support and the stopper, wherein the biasing member is configured to bias the stopper to keep the stopper in the locking position.

[0016] In a first aspect of the utility model, the strap assembly includes a strap and an adjustment strap attached to the strap, the friction coefficient of the adjustment strap is smaller than that of the strap, the snap-fit ​​portion is arranged on the strap, and the non-snap-fit ​​portion is arranged on the adjustment strap.

[0017] In a first aspect of the utility model, the belt assembly includes a belt, the engageable portion and the non-engageable portion are arranged on the belt, and the friction force of the engageable portion is greater than the friction force of the non-engageable portion.

[0018] In the first aspect of the present utility model, the adjustment belt is made of a hard material.

[0019] In the first aspect of the present invention, the strap is selected from any one of a webbing strap and a leather strap, or a combination thereof.

[0020] In the first aspect of the utility model, the snap-fit ​​portion includes a first sub-snap-fit ​​portion and a second sub-snap-fit ​​portion, the first sub-snap-fit ​​portion being configured to lock the angle of the backrest relative to the seat at a value less than or equal to a preset first angle, and the second sub-snap-fit ​​portion being configured to lock the angle of the backrest relative to the seat at a value greater than or equal to a preset second angle.

[0021] In the first aspect of the present invention, the non-engageable portion is located between the first sub-engageable portion and the second sub-engageable portion.

[0022] In the first aspect of the present utility model, the preset first angle is 140°, and the preset second angle is 155°.

[0023] The second aspect of the present invention provides a child carrier, comprising a frame, a seat, a backrest, and the backrest adjustment device of the first aspect, wherein the backrest adjustment device is configured to adjust the angle of the backrest relative to the seat.

[0024] According to the child carrier and backrest adjustment device of the above aspects of the utility model, when the engageable portion of the belt assembly enters the locking mechanism, the engageable portion engages with the locking mechanism, and at this time the belt assembly can only move in one direction relative to the locking mechanism. This can keep the angle of the backrest unchanged under load-bearing conditions, and can conveniently adjust the supporting length of the belt assembly to adjust the angle. When the non-engageable portion of the belt assembly enters the locking mechanism, the non-engageable portion slides with the locking mechanism, and the two-way movement of the belt assembly is not restricted by the locking mechanism, so that the angle of the backrest relative to the seat cannot be locked, thereby avoiding setting the angle of the backrest relative to the seat within a specific angle range that does not meet safety regulations, improving the stability of the child carrier, and reducing the safety hazard of overturning the child carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a child carrier according to some embodiments of the utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the child carrier in another perspective;

[0027] Figure 3 for Figure 2 A schematic diagram of a structure in which the backrest of the child carrier is adjusted to an angle relative to the seat;

[0028] Figure 4 for Figure 3 A schematic diagram of a structure in which the angle of the backrest of the child carrier relative to the seat is adjusted to another angle;

[0029] Figure 5 It is a structural schematic diagram of a backrest adjustment device according to some embodiments of the utility model;

[0030] Figure 6 A schematic diagram of the structure of the connection between the strap assembly and the guide member according to some embodiments of the utility model

[0031] Figure 7 for Figure 5 A partial view of a cross-sectional view of the backrest adjustment device in FIG. 1 ; and

[0032] Figure 8 for Figure 5 Exploded view of the locking mechanism of the backrest adjustment device.

[0033] Description of reference numerals:

[0034] 1. Frame; 2. Seat; 3. Backrest;

[0035] 4. Backrest adjustment device; 41. Strap assembly; 411. Strap; 4111. Free end; 4112a / 4112b. Fixed end; 412. Adjustment belt; 4121. Engageable portion; 4121a. First sub-engageable portion; 4121b. Second sub-engageable portion; 41211. Engagement convex; 41212. Pushing surface; 41213. Abutting surface; 41214. Groove; 4122. Non-engageable portion; 413. Pull ring;

[0036] 42, locking mechanism; 421, stopper; 4211, pivoting portion; 4212, operating portion; 4213, stopper; 4213a, hook end; 4214, wedge-shaped surface; 422, support; 4221, ear plate; 4222, connecting plate; 423, fixing seat; 4231, accommodating cavity; 4232, first through hole; 4233, second through hole; 424, biasing member; 425, pivoting shaft;

[0037] 43. Guide member; 431a / 431b. Guide chute. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0044] According to an embodiment of the utility model, a child carrier and a backrest adjustment mechanism thereof are provided. The child carrier may be, for example, a child stroller. Figures 1 to 4 , a child stroller will be taken as an example to describe a child carrier according to an embodiment of the present invention. The child carrier includes a frame 1, a seat 2, a backrest 3 and a backrest adjustment device 4. The seat 2 is mounted on the frame 1. The backrest 3 is connected to the frame 1, and one end of the backrest 3 is pivotally connected to the seat 2, so that the angle θ of the backrest 3 relative to the seat 2 can be adjusted. The backrest adjustment device 4 is connected to the frame 1 and the backrest 3, respectively, to achieve the adjustment of the angle θ of the backrest 3 relative to the seat 2.

[0045] In one embodiment, if Figures 1 to 4As shown, the backrest adjustment device 4 includes a strap assembly 41, a locking mechanism 42 and a guide member 43. The guide member 43 and the locking mechanism 42 are arranged on the backrest 3, and the strap assembly 41 is connected to the frame 1 and is connected to the locking mechanism 42 through the guide member 43. The locking mechanism 42 can cooperate with the strap assembly 41 to lock the strap assembly 41 in a desired supporting length in one direction, so that the backrest 3 can be locked in a desired angle θ and the backrest can bear a certain weight. It should be noted that the one-way locking means that the locking mechanism 42 allows the strap assembly 41 to move relative to the locking mechanism 42 in the direction D1, that is, the strap assembly 41 is allowed to move in a direction that reduces the supporting length of the strap assembly 41 and reduces the angle θ of the backrest 3 relative to the seat 2, but prevents the strap assembly 41 from moving relative to the locking mechanism 42 in the direction opposite to D1.

[0046] like Figures 5 to 7 As shown, the strap assembly 41 includes a strap 411, an adjustment strap 412 and a pull ring 413. The strap 411 is made of a flexible material. The strap 411 includes, for example, a webbing, a leather strap, etc. The strap 411 has a free end 4111 and two fixed ends 4112a, 4112b. The free end 4111 is movable relative to the locking mechanism 42 to adjust the supporting length of the strap assembly 41. The fixed ends 4112a, 4112b are respectively connected to the frame 1 at opposite sides of the backrest 3 in the horizontal direction through the guide member 43 to support the backrest 3. The supporting length of the strap assembly 41 is defined by the sum of the lengths of the strap 411 between the guide member 43 and the two fixed ends 4112a, 4112b. In this embodiment, the strap 411 is formed by a flexible belt, one end of which branches into two sub-ends, which respectively form two fixed ends 4112a and 4112b, and one end of the flexible belt away from the branch forms a free end. In other embodiments, the strap 411 may be formed by two flexible belts connected (e.g., bonded, glued, sewed, etc.), wherein the two ends of one flexible belt are respectively formed into two fixed ends 4112a and 4112b, and the end of the other flexible belt away from the connection of the two flexible belts forms a free end 4111.

[0047] In this embodiment, the pull ring 413 is connected to the free end 4111, so that the pull ring 413 can be easily pulled to adjust the supporting length of the strap 411. The adjustment belt 412 is attached to the strap 411 and is located between the guide 43 and the pull ring. In other embodiments, the adjustment belt 412 may be attached to the free end 4111 of the strap 411, and the pull ring 413 may be connected to the adjustment belt 412. Optionally, the adjustment belt 412 may be fixedly attached to the strap 411 by sewing, bonding, hot melting, etc.

[0048] Continue to refer to Figures 5 to 7The adjustment belt 412 includes an engaging portion 4121 and a non-engaging portion 4122. The non-engaging portion 4122 has a flat surface, in particular, a smooth surface. The engaging portion 4121 includes a plurality of engaging protrusions 41211 configured to be unidirectionally engaged with the locking mechanism 42. In this embodiment, the engaging protrusions 41211 may be ratchet teeth. In other embodiments, the engaging protrusions may also be, for example, bosses, convex points, etc.

[0049] When the engaging portion 4121 of the strap assembly 41 enters the locking mechanism 42, the engaging portion 4121 engages with the locking mechanism 42, so that the strap assembly 41 can move unidirectionally relative to the locking mechanism 42. At this time, the strap assembly 41 can only move relative to the locking mechanism 42 in a direction that reduces the supporting length of the strap assembly 41, that is, reduces the angle θ, so that the strap assembly 41 is unidirectionally locked at the required supporting length, thereby conveniently adjusting the supporting length of the strap assembly 41 in one direction to adjust the angle θ, and keeping the angle θ of the backrest 3 unchanged when bearing weight.

[0050] When the non-engageable portion 4122 of the strap assembly 41 enters the locking mechanism 42, the non-engageable portion 4122 and the locking mechanism 42 slide together, so that the strap assembly 41 can move bidirectionally relative to the locking mechanism 42. At this time, the movement of the strap assembly 41 is not restricted by the locking mechanism 42. The strap assembly 41 can freely move in the opposite direction of D1 relative to the locking mechanism 42 within the stroke range corresponding to the non-engageable portion, so that the supporting length of the strap assembly 41 is increased, and can also move in the direction of D1 relative to the locking mechanism 42, so that the supporting length of the strap assembly 41 is reduced. Therefore, by adjusting the position and size of the non-engageable portion 4122, when the angle θ of the backrest 3 relative to the seat 2 is within the preset non-desirable angle range, the backrest cannot be unidirectionally locked at the angle θ relative to the seat. In other words, by setting the non-engageable portion 4122, the angle θ of the backrest 3 relative to the seat 2 can skip the non-desirable angle range, that is, the angle of the backrest 3 relative to the seat 2 cannot be locked within the non-desirable angle range. Specifically, the preset first angle and the preset second angle define an undesirable angle range. The preset first angle is, for example, 140°, and the preset second angle is, for example, 155°. The undesirable angle range is, for example, greater than the preset first angle and less than the preset second angle, that is, the undesirable angle range is (140°, 155°). The inventor of the utility model discovered through experiments that when the angle θ between the backrest 3 and the seat 2 is within the above-mentioned undesirable angle range, if the weight carried by the backrest 3 is large, for example, a child leans against the backrest 3, the child carrier may easily overturn, posing a safety hazard. Therefore, it is necessary to make the angle θ between the backrest 3 and the seat 2 avoid the undesirable angle range to reduce the safety hazard of the child carrier.

[0051] In one embodiment, if Figures 5 to 7As shown, the engaging portion 4121 includes a first sub-engageable portion 4121a and a second sub-engageable portion 4121b. The non-engageable portion 4122 is located between the first sub-engageable portion 4121a and the second sub-engageable portion 4121b. When the first sub-engageable portion 4121a enters the locking mechanism 42, the angle θ between the backrest 3 and the seat 2 is less than or equal to the minimum critical value defining the undesirable angle range, that is, θ≤140°. When the second sub-engageable portion 4121b enters the locking mechanism 42, the angle θ between the backrest 3 and the seat 2 is greater than or equal to the maximum critical value defining the undesirable angle range, that is, θ≥155°. When the non-engageable portion 4122 enters the locking mechanism 42, the angle θ between the backrest 3 and the seat 2 is in an undesirable angle range (140°, 155°). When no external force is applied to the backrest 3 or when a small external force is applied to the backrest 3 (for example, gently pushing the backrest 3), the backrest 3 rotates to 155° relative to the seat 2, so that the second sub-engageable portion 4121b enters the locking mechanism 42 and engages with the locking mechanism 42. In other words, the angle θ of the backrest 3 relative to the seat 2 can only be locked in a range less than or equal to 140° (for example, 100°, 121.5°, 130°, etc.) or greater than or equal to 155° (for example, 158.5°, 167°, 171°, etc.). Thus, the angle θ of the backrest 3 relative to the seat 2 is avoided from being adjusted in an undesirable angle range, the stability of the child carrier is improved, and the safety hazard of the child carrier tipping over is reduced.

[0052] In one embodiment, if Figures 5 and 6 As shown, the guide member 43 is fixed on the backrest 3. The guide member 43 is provided with two guide bevels 431a, 431b. The fixed end 4112a and the fixed end 4112b of the strap assembly pass through the guide bevel 431a and the guide bevel 431b respectively and are connected to the frame 1 on opposite sides of the backrest 3 in the horizontal direction. The sum of the length of the strap 411 between the fixed end 4112a and the guide bevel 431a and the length of the strap 411 between the fixed end 4112b and the guide bevel 431b is the supporting length of the strap 411. The two guide bevels 431a, 431b are symmetrically arranged on the guide member 43. The extension direction of each guide bevel 431a, 431b is at an angle with the moving direction (D1 direction and the opposite direction of D1) of the adjustment belt 412, for example, 45° or 135°. In this embodiment, the guide member 43 is made of a hard material such as plastic, metal, etc. In other embodiments, the guide member 43 may be made of a flexible material such as fabric, leather, or the like.

[0053] In one embodiment, if Figures 7 and 8As shown, the locking mechanism 42 includes a stopper 421, a support 422, a fixing seat 423 and a biasing member 424. The fixing seat 423 is fixedly connected to the backrest 3 and has a receiving cavity 4231 with an opening facing the backrest 3. The fixing seat 423 has a first through hole 4232 and a second through hole 4233. The first through hole 4232 passes through the bottom wall of the receiving cavity 4231 and communicates with the receiving cavity 4231. The fixing seat 423 is provided with a second through hole 4233 for the belt assembly 41 to pass through, and the second through hole 4233 passes through two opposite side walls of the receiving cavity 4231.

[0054] like Figures 7 and 8 As shown, the support 422 has two ear plates 4221 and a connecting plate 4222 connected between the two ear plates 4221. The two ear plates 4221 are parallel to each other, and the connecting plate 4222 is located on a side of the two ear plates 4221 away from the first through hole 4232. The support 422 is accommodated in the accommodating cavity 4231 and connected to the backrest 3 through the fixing seat 423. Specifically, the connecting plate 4222 of the support 422 abuts against the backrest 3 through the fixing seat 423. In other embodiments, the fixing seat 423 may not be provided, and the support 422 is directly fixed to the backrest 3.

[0055] like Figures 7 and 8 As shown, the stopper 421 is configured to be switchable between a locking position and a release position. The stopper 421 includes a pivoting portion 4211, an operating portion 4212 and a stopper 4213. At least a portion of the stopper 421 is located in the accommodating cavity 4231 and is pivotally connected to the support 422. Specifically, the pivoting portion 4211 of the stopper 421 is pivotally connected between two ear plates 4221 of the support 422 through a pivot shaft 425. The operating portion 4212 of the stopper 421 extends out of the accommodating cavity 4231 through a first through hole 4232 to facilitate the operation of the stopper 421 to pivot. The stopper 4213 is arranged facing the connecting plate 4222 of the support 422. The strap assembly 41 is passed through the second through hole 4233 and is arranged between the connecting plate 4222 and the stopper 4213 of the stopper 421. The biasing member 424 is connected between the pivoting portion 425 of the stopper 421 and the ear plate 4221 of the support 422. The biasing member 424 is suitable for biasing the stopper 421 to keep the stopper 421 in the locked position. Specifically, the biasing member 424 applies a force to the stopper 421 to rotate toward the connecting plate 4222 of the support 422. In this embodiment, the biasing member 424 is a torsion spring. In other embodiments, the biasing member 424 can be an elastic member such as a compression spring, a pull ring, a spring, or rubber.

[0056] Continue to refer to Figures 7 and 8The stopper 4213 includes a hook end 4213a. When the stopper 421 is in the locking position, the stopper 4213 can be engaged with the engageable portion 4121, that is, the hook end 4213a can be engaged with one of the multiple engaging protrusions 41211, so that the engageable portion 4121 can only move unidirectionally along the D1 direction that shortens the supporting length relative to the stopper 421, and cannot move in the opposite direction of D1, thereby locking the strap assembly 41 in a desired supporting length in one direction. When the stopper 421 is in the unlocking position, the stopper 4213 is disengaged from the engageable portion 4121, and the movement of the engageable portion 4121 is not restricted by the locking mechanism 42, so that the engageable portion 4121 can move in the D1 direction relative to the stopper 421, and can also move in the opposite direction of D1. When the non-engageable portion 4122 cooperates with the stop portion 4213, the non-engageable portion 4122 and the stop portion 4213 are slidably engaged. At this time, the non-engageable portion 4122 can move in the direction D1 relative to the stop member 421, or can move in the opposite direction of D1. It should be noted that the non-engageable portion 4122 and the stop portion 4213 are slidably engaged, including: the non-engageable portion 4122 and the stop portion 4213 are spaced or just in contact, or the non-engageable portion 4122 and the stop portion 4213 are in contact but the friction between the two is small, so that the non-engageable portion 4122 can move in the opposite direction of D1 relative to the stop portion 4213 without external force, or when a small external force is applied to the backrest 3 (for example, gently pushing the backrest 3).

[0057] Reference Figures 7 and 8, the hook end 4213a is provided with a wedge surface 4214. Each engaging protrusion 41211 has a pushing surface 41212 and an abutting surface 41213. A groove 41214 capable of accommodating the hook end 4213a is formed between two adjacent engaging protrusions 41211. When the hook end 4213a is engaged with the engaging protrusion 41211, when the adjustment belt 412 is subjected to a force in the direction D1, the pushing surface 41212 can push the wedge surface 4214 to make the stopper 421 pivot to the unlocking position and the hook end 4213a withdraw from the current groove 41214. When the current pushing surface 41212 moves to the disengagement wedge surface 4214, the stopper is pivoted from the unlocking position to the locking position under the biasing action of the biasing member 424 and to another groove adjacent to the current groove 41214. 41214 is engaged, thereby achieving the movement of the adjustment belt 412 in the direction of D1; when the adjustment belt 412 is subjected to a force in the opposite direction of D1, for example, when the backrest 3 is subjected to an external force (for example, when a child leans on the backrest 3), the belt assembly 41 is subjected to a force in the opposite direction of D1, at which time the engagement protrusion 41211 of the belt assembly 41 is abutted by the hook end 4213a of the stopper 421, and the stopper 421 cannot pivot from the locked position to the unlocked position, so that the belt assembly 41 cannot move in the opposite direction of D1 that increases the supporting length. Thus, the belt assembly 41 is unidirectionally locked at the required supporting length, that is, the backrest 3 is unidirectionally locked at the required angle θ.

[0058] The operating principle of the backrest adjustment device 4 according to the embodiment of the present application is as follows:

[0059] Reference Figure 7 , when the engaging portion 4121 of the stopper 421 cooperates with the stopper 4213, when it is necessary to reduce the angle θ of the backrest 3 relative to the seat 2, the pull ring 413 is pulled along the direction D1, so that the supporting length of the strap assembly 41 is reduced. When it is necessary to increase the angle θ of the backrest 3 relative to the seat 2, a force F is applied to the operating portion 4212 of the stopper 421 so that the stopper 4213 pivots away from the engaging portion 4121, and the hook end 4213a withdraws from the groove 41214, that is, the stopper 421 pivots from the locking position to the unlocking position, and the strap assembly 41 is movable in the opposite direction of D1, thereby increasing the supporting length of the strap assembly 41 and correspondingly increasing the angle θ between the backrest 3 and the seat 2. When the backrest 3 is adjusted to a desired angle θ, the external force F is released, and the stopper 421 pivots to a locking position under the biasing action of the biasing member 424 , thereby unidirectionally locking the belt assembly 41 at a desired supporting length.

[0060] In some embodiments not shown, the strap assembly 41 includes a strap 411 and an adjustment strap 412 attached to the strap 411. The strap 411 is made of a flexible material such as fabric, leather, etc. The adjustment strap 412 forms a snap-fit ​​portion 4121. The snap-fit ​​portion 4121 includes a plurality of snap-fit ​​protrusions 41211 configured to snap-fit ​​with the stop portion 4213 in one direction, thereby locking the strap assembly in one direction at the required support length. Among them, the snap-fit ​​protrusion 41211 can be at least one of a ratchet, a boss, or a convex point. The snap-fit ​​portion 4121 includes a first sub-snap-fit ​​portion 4121a and a second sub-snap-fit ​​portion 4121b. When the first sub-snap-fit ​​portion 4121a enters the locking mechanism 42, the angle θ between the backrest 3 and the seat 2 is less than or equal to the minimum critical value defining the undesired angle range, that is, θ≤140°. When the second sub-engageable portion 4121b enters the locking mechanism 42, the angle θ between the backrest 3 and the seat 2 is greater than or equal to the maximum critical value defining the undesirable angle range, that is, θ≥155°. The difference between this embodiment and the above-mentioned embodiment is that the strap 411 forms a non-engageable portion 4122. The friction coefficient of the non-engageable portion 4122 is small, so that when the non-engageable portion 4122 cooperates with the hook end 4213a, the non-engageable portion 4122 can move bidirectionally along the D1 direction and the opposite direction of D1 relative to the stopper 421. The non-engageable portion 4122 is located between the first sub-engageable portion 4121a and the second sub-engageable portion 4121b, so that the angle of the backrest 3 relative to the seat 2 cannot be locked within the undesirable angle range. In other embodiments, the friction force of the engageable portion 4121 is greater than the friction force of the non-engageable portion 4122. The snap-fitting portion 4121 and the stop portion 4213 can cooperate with each other through a sufficiently large friction force so that the strap assembly can be unidirectionally locked at a required supporting length.

[0061] In other embodiments not shown, the strap assembly 41 includes a strap 411 and an adjustment strap 412 attached to the strap 411. The strap 411 is made of a flexible material such as fabric, leather, etc. The adjustment strap 412 forms a snap-fit ​​portion 4121 and a non-snap-fit ​​portion 4122. The friction force of the snap-fit ​​portion 4121 is greater than the friction force of the non-snap-fit ​​portion 4122. The snap-fit ​​portion 4121 and the stop portion 4213 can cooperate with a sufficiently large friction force to lock the strap assembly unidirectionally at the required supporting length. The stop portion 4213 of the stop member 421 is a hook end 4213a to increase the friction force between the snap-fit ​​portion 4121 and the hook end 4213a. The friction coefficient of the non-engageable portion 4122 is small, so that when the non-engageable portion 4122 cooperates with the hook end 4213a, the non-engageable portion 4122 can move bidirectionally relative to the stopper 421 along the D1 direction and the opposite direction of D1. The non-engageable portion 4122 is located between the first sub-engageable portion 4121a and the second sub-engageable portion 4121b, so that the angle of the backrest 3 relative to the seat 2 cannot be locked within the non-desired angle range. In some other embodiments not shown, the strap assembly 41 includes a strap 411 and an adjustment strap 412. The strap 411 is made of a flexible material such as woven cloth, leather, etc. The strap 411 forms the engageable portion 4121. The engageable portion 4121 and the stopper 4213 can cooperate with a sufficiently large friction force so that the strap assembly is unidirectionally locked at the required supporting length. The stopping portion 4213 of the stopping member 421 is a hook end 4213 a to increase the friction force between the engageable portion 4121 and the hook end 4213 a. Specifically, when the adjustment belt 412 is subjected to an external force in the direction of D1, the engaging portion 4121 drives the hook end 4213a to rotate, so that the pressure of the hook end 4213a on the engaging portion 4121 is reduced, thereby reducing the friction between the hook end 4213a and the engaging portion 4121, thereby making the adjustment belt 412 movable in the direction of D1; when the adjustment belt 412 is subjected to an external force in the opposite direction of D1, the engaging portion 4121 drives the hook end 4213a to deflect, and the hook end 4213a further presses the engaging portion 4121, so that the pressure of the hook end 4213a on the engaging portion 4121 is increased, thereby increasing the friction between the hook end 4213a and the engaging portion 4121, thereby making the adjustment belt 412 immovable in the opposite direction of D1. In some embodiments, the engaging portion 4121 may also be provided with a protrusion to increase the friction. The adjustment belt 412 is made of a rigid flat material, such as a plastic sheet. The adjustment belt 412 forms a non-engageable portion 4122. The non-engageable portion 4122 is slidably matched with the stopper 421, and the surface of the non-engageable portion 4122 is flat and smooth, so that when the non-engageable portion 4122 is matched with the hook end 4213a, the non-engageable portion 4122 can move bidirectionally along the D1 direction and the opposite direction of D1 relative to the stopper 421. The adjustment belt 412 can be fixedly connected to the strap 411 by suturing, bonding, hot melting, etc.The other components in this embodiment are the same as those in the above embodiment and will not be described in detail here.

[0062] In other embodiments not shown, the strap assembly 41 includes a strap 411, which is made of materials such as webbing, leather, etc. The strap 411 includes a snap-fit ​​portion 4121 and a non-snap-fit ​​portion 4122. The snap-fit ​​portion 4121 snaps into the stopper 421 to achieve a one-way locking principle, which can refer to the above embodiment. The non-snap-fit ​​portion 4122 is slidably matched with the stopper 421, and the friction coefficient of the non-snap-fit ​​portion 4122 is less than the friction coefficient of the snap-fit ​​portion 4121, so that when the non-snap-fit ​​portion 4122 is matched with the hook end 4213a, the non-snap-fit ​​portion 4122 can move bidirectionally relative to the stopper 421 along the D1 direction and the opposite direction of D1. In other embodiments, the friction coefficient of the non-snap-fit ​​portion 4122 can be the same as the friction coefficient of the snap-fit ​​portion 4121. The thickness of the non-engageable portion 4122 is smaller than the thickness of the engageable portion 4121, so that when the non-engageable portion 4122 cooperates with the hook end 4213a, the non-engageable portion 4122 is spaced apart from the engageable portion 4122 or only contacts the engageable portion 4122, so that the non-engageable portion 4122 can move bidirectionally relative to the stop member 421 along the direction D1 and the opposite direction of D1.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A child carrier, comprising a frame, a seat, a backrest and a backrest adjustment device, wherein the backrest adjustment device is used to adjust the angle of the backrest relative to the seat, characterized in that: The backrest adjustment device comprises: a locking mechanism, disposed on the backrest; and A belt assembly connected to the frame of the child carrier and having an adjustable supporting length, wherein the belt assembly is provided with a snap-fit ​​portion and a non-snap-fit ​​portion; Wherein, the locking mechanism is configured to engage with the engageable portion to unidirectionally lock the strap assembly at a desired supporting length, and the non-engageable portion is configured to slidably cooperate with the locking mechanism so that the non-engageable portion can slide through the locking mechanism in both directions relative to the locking mechanism.

2. The child carrier according to claim 1, characterized in that: The belt assembly comprises: a tether extending from the frame through the locking mechanism disposed on the backrest to define the support length of the tether assembly; and An adjustment belt is attached to the belt, and at least one of the engageable portion and the non-engageable portion is arranged on the adjustment belt.

3. The child carrier according to claim 2, characterized in that: The locking mechanism comprises a stopper having a hook end, and the engageable portion comprises a plurality of engaging protrusions configured to be engaged with the hook end in one direction.

4. The child carrier according to claim 2, characterized in that: The strap has a free end and at least two fixed ends, wherein the at least two fixed ends are respectively connected to the frame at opposite sides of the backrest in a horizontal direction, and the free end is movable relative to the locking mechanism to adjust the supporting length of the strap assembly.

5. The child carrier according to claim 4, characterized in that: It also includes a guide member, which is arranged on the backrest, and has at least two guide bevel grooves. The at least two fixed ends respectively pass through corresponding guide bevel grooves of the at least two guide bevel grooves and are connected to the frame at the opposite sides of the backrest.

6. The child carrier according to claim 1, characterized in that: The locking mechanism comprises: a stopper, which is pivotally arranged at the locking mechanism and has a stopper portion, at least a portion of the belt assembly passes through the locking mechanism via the stopper stopper portion, and the stopper is configured to be switchable between a locking position and a release position; Wherein, when the stopper is in the locking position, the stopper engages with the engageable portion to unidirectionally lock the strap assembly at the required supporting length, or slidably cooperates with the non-engageable portion; Wherein, when the stopper is in the unlocking position, the one-way movement restriction of the belt assembly by the stopper is released.

7. The child carrier according to claim 6, characterized in that: The locking mechanism also includes: A support, arranged on the backrest; a biasing member disposed between the support and the stopper, the biasing member being configured to bias the stopper to keep the stopper in the locked position; The stopper is pivotally connected to the support, and at least a portion of the belt assembly passes through the locking mechanism between the support and the stopper.

8. The child carrier according to claim 6, characterized in that: The locking mechanism also includes: A fixing seat, fixedly connected to the backrest, the fixing seat having a receiving cavity with an opening facing the backrest; A support, accommodated in the accommodation cavity via the opening and connected to the backrest via the fixing seat; wherein a portion of the stopper is located within the accommodating cavity and is pivotally connected to the support, and the at least a portion of the strap assembly passes through the locking mechanism between the support and the bottom wall of the accommodating cavity; Wherein, the bottom wall of the accommodating cavity is provided with a first through hole, and another part of the stopper passes through the first through hole and extends out of the accommodating cavity; The fixing seat is provided with a second through hole for the strap assembly to pass through, the second through hole passes through two opposite side walls of the accommodating cavity, and at least a portion of the strap assembly passes through the second through hole.

9. The child carrier according to claim 2, characterized in that: The engageable portion and the non-engageable portion are arranged in one of the following ways: The engageable portion is arranged on the strap, and the non-engageable portion is arranged on the adjustment belt, wherein the friction coefficient of the adjustment belt is smaller than that of the strap; The engageable portion is arranged on the adjustment belt, and the non-engageable portion is arranged on the strap; The engageable portion and the non-engageable portion are arranged on the adjustment belt, wherein a friction force of the engageable portion is greater than a friction force of the non-engageable portion.

10. The child carrier according to claim 1, characterized in that: The snap-fit ​​portion includes a first sub-snap-fit ​​portion and a second sub-snap-fit ​​portion, wherein the first sub-snap-fit ​​portion is configured to lock the angle of the backrest relative to the seat at a value less than or equal to a preset first angle, and the second sub-snap-fit ​​portion is configured to lock the angle of the backrest relative to the seat at a value greater than or equal to a preset second angle; Wherein, the non-engageable portion is located between the first sub-engageable portion and the second sub-engageable portion.

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