Child carrier

Abstract

The utility model relates to a child carrier which comprises a frame (1), a seat part (2), a backrest (3) and a backrest adjusting device (4). The backrest adjusting device (4) 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); the bridle assembly (41) is connected to the frame (1) of the child carrier and has an adjustable bearing length, and the bridle assembly (41) is provided with a clamping part (4121) and a non-clamping part (4122). The engageable portion (4121) and the non-engageable portion (4122) are both adapted to enter the locking mechanism (42), and when the engageable portion (4121) enters the locking mechanism (42), a friction force applied to the engageable portion (4121) is greater than a friction force applied to the non-engageable portion (4122) when the non-engageable portion (4122) enters the locking mechanism (42).

Description

[0001] Divisional application statement

[0002] This application is a divisional application of Chinese utility model patent application filed on May 11, 2024, entitled "Children's Vehicle" and with application number 202421028494.X. Technical Field

[0003] This utility model relates to the field of children's products technology, and in particular to a backrest adjustment device capable of adjusting the backrest angle and a children's vehicle having the backrest adjustment device. Background Technology

[0004] Child vehicles typically include backrest adjustment mechanisms, such as strap-type adjustment mechanisms, to adjust the angle of the backrest relative to the seat. Specifically, the angle between the backrest and seat is infinitely adjustable by adjusting the length of the strap. Existing strap-type adjustment mechanisms generally have the following problems: poor locking effect, prone to failure; and inability to adjust beyond the flat reclining angle range, making it easy for the backrest to tilt when adjusted within this range, creating a safety hazard. Utility Model Content

[0005] To solve the above problems, this utility model provides a backrest adjustment device that can adjust the angle of the backrest relative to the seat and a child carrier having the backrest adjustment device.

[0006] A first aspect of this invention provides a backrest adjustment device. The backrest adjustment device is used to adjust the angle of the backrest of a child vehicle relative to the seat of the child vehicle. The backrest adjustment device includes a locking mechanism and a strap assembly. The locking mechanism is disposed on the backrest. The strap assembly is connected to the frame of the child vehicle and has an adjustable support length. The strap assembly is provided with a locking portion and a non-locking portion. The locking mechanism is configured to engage with the locking portion to unidirectionally lock the strap assembly to the desired support length, and the non-locking portion is configured to slide with the locking mechanism so that the non-locking portion can slide bidirectionally through the locking mechanism.

[0007] In a first aspect of the present invention, the harness assembly includes: a harness extending from the frame through the locking mechanism disposed on the backrest to define the support length of the harness assembly; and an adjustment strap attached to the harness, at least one of the engaging portion and the non-engaging portion being disposed on the adjustment strap.

[0008] In a first aspect of this utility model, the locking mechanism includes a stop member having a hook end, and the engaging portion includes a plurality of engaging protrusions configured to engage unidirectionally with the hook end.

[0009] In a first aspect of this invention, the strap assembly further includes a pull ring connected to the adjustment strap or the strap.

[0010] In a first aspect of the present invention, the strap has a free end and at least two fixed ends, the at least two fixed ends being connected to the frame on opposite sides of the back in a horizontal direction, the free end being movable relative to the locking mechanism to adjust the support length of the strap assembly.

[0011] In a first aspect of this utility model, the backrest adjustment device further includes a guide member disposed on the backrest. The guide member has at least two guide grooves, and the at least two fixed ends pass through corresponding guide grooves in the at least two guide grooves and are connected to the vehicle frame on the opposite sides of the backrest.

[0012] In a first aspect of this invention, the locking mechanism includes: a stop, pivotally disposed within the locking mechanism and having a stop portion, wherein at least a portion of the strap assembly passes through the locking mechanism via the stop portion, the stop being switchable between a locked position and an unlocked position. When the stop is in the locked position, the stop portion engages with the engaging portion to unidirectionally lock the strap assembly at the desired support length, or slides with the non-engaging portion. When the stop is in the unlocked position, the unidirectional movement restriction of the strap assembly by the stop portion is released.

[0013] In a first aspect of this invention, the locking mechanism further includes a support disposed on the backrest. The stop is pivotally connected to the support, and at least a portion of the strap assembly passes through the locking mechanism between the support and the stop.

[0014] In a first aspect of the present invention, the locking mechanism further includes: a fixing seat fixedly connected to the backrest, the fixing seat having a receiving cavity with an opening facing the backrest; and a support received within the receiving cavity via the opening and connected to the backrest via the fixing seat. A portion of the stop is located within the receiving cavity and is pivotally connected to the support, and at least a portion of the strap assembly passes through the locking mechanism between the support and the bottom wall of the receiving cavity.

[0015] In a first aspect of this utility model, the bottom wall of the receiving cavity is provided with a first through hole, and another part of the stop member extends out of the receiving cavity through the first through hole.

[0016] In a first aspect of the present invention, the fixing seat is provided with a second through hole through which the strap assembly passes, the second through hole penetrating two opposite sidewalls of the receiving cavity, and at least a portion of the strap assembly passing through the second through hole.

[0017] In a first aspect of the present invention, the locking mechanism further includes: a biasing member disposed between the support and the stop member, the biasing member being configured to bias the stop member so that the stop member is held in the locked position.

[0018] In a first aspect of the present invention, the strap assembly includes a strap and an adjustment strap attached to the strap, the adjustment strap having a lower coefficient of friction than the strap, a snap-fit ​​portion being disposed on the strap, and a non-snap-fit ​​portion being disposed on the adjustment strap.

[0019] In a first aspect of this invention, the strap assembly includes a strap, a locking portion and a non-locking portion are arranged on the strap, and the frictional force of the locking portion is greater than the frictional force of the non-locking portion.

[0020] In a first aspect of this invention, the adjustment band is made of a rigid material.

[0021] In a first aspect of this invention, the strap is selected from either webbing or leather straps, or a combination thereof.

[0022] In a first aspect of this utility model, the latching portion includes a first latching portion and a second latching portion. The first latching portion is configured to lock the angle of the backrest relative to the seat portion at a preset first angle, and the second latching portion is configured to lock the angle of the backrest relative to the seat portion at a preset second angle.

[0023] In a first aspect of this invention, the non-locking portion is located between the first sub-locking portion and the second sub-locking portion.

[0024] In the first aspect of this utility model, the preset first angle is 140° and the preset second angle is 155°.

[0025] A second aspect of this invention provides a child vehicle. The child vehicle includes a frame, a seat, a backrest, and the backrest adjustment device described in the first aspect, the backrest adjustment device being configured to adjust the angle of the backrest relative to the seat.

[0026] A third aspect of this utility model provides a child vehicle, comprising a frame, a seat, a backrest, and a backrest adjustment device for adjusting the angle of the backrest relative to the seat. The backrest adjustment device includes: a locking mechanism disposed on the backrest; and a strap assembly connected to the frame of the child vehicle and having an adjustable support length, the strap assembly having a locking portion and a non-locking portion. Both the locking portion and the non-locking portion are adapted to engage with the locking mechanism, and the frictional force experienced by the locking portion when it engages with the locking mechanism is greater than the frictional force experienced by the non-locking portion when it engages with the locking mechanism.

[0027] In a third aspect of this invention, the locking mechanism includes a stop adapted to contact either the engaging portion or the non-engaging portion. The engaging portion has a first coefficient of friction, and the non-engaging portion has a second coefficient of friction, wherein the first coefficient of friction is greater than the second coefficient of friction.

[0028] In a third aspect of the present invention, the first coefficient of friction is set to limit the sliding of the engaging portion relative to the stop to unidirectionally lock the strap assembly at the desired support length, and the second coefficient of friction is set to allow the non-engaging portion to slide into the stop so that the non-engaging portion can slide bidirectionally through the locking mechanism relative to the locking mechanism.

[0029] In a third aspect of the present invention, the stop is pivotally arranged in the locking mechanism and is switchable between a locked position and an unlocked position; when the engaging portion is engaged in the locking mechanism, when the stop is in the locked position, the stop contacts the engaging portion to unidirectionally lock the strap assembly at the desired support length, and when the stop is in the unlocked position, the stop disengages from the engaging portion to release the restriction on unidirectional movement of the strap assembly.

[0030] In a third aspect of this invention, when the non-locking portion enters the locking mechanism, the non-locking portion can slide bidirectionally relative to the locking mechanism when the stop member is in the locked or unlocked position.

[0031] In a third aspect of the present invention, the harness assembly includes: a harness extending from the frame through the locking mechanism disposed on the backrest to define the support length of the harness assembly; and an adjustment strap attached to the harness, at least one of the engaging portion and the non-engaging portion being disposed on the adjustment strap.

[0032] In a third aspect of this invention, one of the engaging portion and the non-engaging portion is arranged on the strap, and the other of the engaging portion and the non-engaging portion is arranged on the adjustment strap.

[0033] In a third aspect of this invention, both the engaging portion and the non-engaging portion are arranged on the adjusting belt.

[0034] In a third aspect of this invention, the latching portion includes a first latching portion and a second latching portion. The first latching portion is configured to lock the angle of the backrest relative to the seat portion at a preset first angle, and the second latching portion is configured to lock the angle of the backrest relative to the seat portion at a preset second angle. The non-latching portion is located between the first and second latching portions.

[0035] A fourth aspect of this utility model provides a child vehicle, the child vehicle including a frame, a seat, a backrest, and a backrest adjustment device, the backrest adjustment device being used to adjust the angle of the backrest relative to the seat. The backrest adjustment device includes: a locking mechanism disposed on the backrest; and a strap assembly connected to the frame of the child vehicle and having an adjustable support length, the strap assembly having a locking portion and a non-locking portion. The locking mechanism includes a stop, the locking portion includes a plurality of locking protrusions configured to engage unidirectionally with the stop to unidirectionally lock the strap assembly at the desired support length, and the non-locking portion is configured to slide with the stop.

[0036] In a fourth aspect of this invention, the locking mechanism includes a stop having a stop portion, the stop being pivotable between a locked position and an unlocked position. When the engaging portion is engaged in the locking mechanism, when the stop is in the locked position, the stop engages with one of the plurality of engaging protrusions to unidirectionally lock the strap assembly at the desired support length, and when the stop is in the unlocked position, the stop disengages from the engaging protrusion to release the restriction on unidirectional movement of the strap assembly.

[0037] In a fourth aspect of this invention, the stop portion includes a hook end. Each of the plurality of engaging protrusions has a pushing surface and an abutting surface, and a groove is formed between adjacent engaging protrusions to accommodate the hook end.

[0038] In a fourth aspect of this utility model, the hook end is provided with a wedge-shaped surface, and when the hook end is engaged with the engaging protrusion, the pushing surface is adapted to pivot the stop member toward the unlocking position by pushing against the wedge-shaped surface.

[0039] In a fourth aspect of this invention, the locking mechanism further includes: a support disposed on the backrest; and a biasing member disposed between the support and the stop, the biasing member being configured to bias the stop to hold the stop in the locked position. The stop is pivotally connected to the support, and either the engaging portion or the non-engaging portion passes through the locking mechanism between the support and the stop.

[0040] In a fourth aspect of this invention, the locking mechanism further includes: a fixed seat fixedly connected to the backrest, the fixed seat having a receiving cavity with an opening facing the backrest; and a support received within the receiving cavity via the opening and connected to the backrest via the fixed seat. A portion of the stop is located within the receiving cavity and pivotally connected to the support, and either the engaging portion or the non-engaging portion passes through the locking mechanism between the support and the bottom wall of the receiving cavity. The bottom wall of the receiving cavity is provided with a first through hole, and another portion of the stop extends out of the receiving cavity through the first through hole.

[0041] In a fourth aspect of the present invention, the fixing seat is provided with a second through hole through which the strap assembly passes, the second through hole penetrating two opposite sidewalls of the receiving cavity, and either the engaging portion or the non-engaging portion passes through the second through hole.

[0042] In a fourth aspect of this utility model, the support has two lugs and a connecting plate connected between the two lugs.

[0043] In a fourth aspect of this utility model, the stop further includes a pivot portion and an operating portion. The pivot portion is pivotally connected between the two lugs of the support via a pivot shaft. The operating portion extends out of the receiving cavity through the first through hole. The stop portion is disposed facing the connecting plate of the support.

[0044] In a fourth aspect of this invention, the strap has a free end and at least two fixed ends, the at least two fixed ends being connected to the frame on opposite sides of the backrest in a horizontal direction, and the free end being movable relative to the locking mechanism to adjust the support length of the strap assembly. The child carrier also includes a guide member disposed on the backrest, the guide member having at least two guide grooves, and the at least two fixed ends passing through corresponding guide grooves in the at least two guide grooves to be connected to the frame on opposite sides of the backrest.

[0045] According to the above-described aspects of the child vehicle and backrest adjustment device of this utility model, when the engaging portion of the strap assembly enters the locking mechanism, the engaging portion engages with the locking mechanism, at which point the strap assembly can only move in one direction relative to the locking mechanism. This ensures that the angle of the backrest remains constant under load, and also allows for convenient adjustment of the support length of the strap assembly to adjust the angle. When the non-engaging portion of the strap assembly enters the locking mechanism, the non-engaging portion slides with the locking mechanism, and the bidirectional movement of the strap assembly is not restricted by the locking mechanism. This prevents the angle of the backrest relative to the seat from being locked, thereby avoiding setting the angle of the backrest relative to the seat within a specific angle range that does not meet safety standards, improving the stability of the child vehicle, and reducing the safety hazard of the child vehicle tipping over. Attached Figure Description

[0046] Figure 1 This is a structural schematic diagram of a child vehicle according to some embodiments of the present invention;

[0047] Figure 2 for Figure 1 A structural diagram of a child vehicle from another perspective;

[0048] Figure 3 for Figure 2 A schematic diagram of the structure of a child vehicle in which the angle of the backrest relative to the seat is adjusted to a certain angle;

[0049] Figure 4 for Figure 3 A schematic diagram of the structure of a child vehicle in which the angle of the backrest relative to the seat is adjusted to another angle;

[0050] Figure 5 This is a schematic diagram of the backrest adjustment device according to some embodiments of the present invention;

[0051] Figure 6 This is a schematic diagram of the connection between the strap assembly and the guide member according to some embodiments of the present invention.

[0052] Figure 7 for Figure 5 A partial view of the cross-sectional view of the backrest adjustment device; and

[0053] Figure 8 for Figure 5 An exploded view of the locking mechanism of the back adjustment device.

[0054] Explanation of reference numerals in the attached figures:

[0055] 1. Frame; 2. Seat; 3. Backrest;

[0056] 4. Backrest adjustment device; 41. Strap assembly; 411. Strap; 4111. Free end; 4112a / 4112b. Fixed end; 412. Adjustment belt; 4121. Snap-fit ​​part; 4121a. First snap-fit ​​part; 4121b. Second snap-fit ​​part; 41211. Snap-fit ​​protrusion; 41212. Pushing surface; 41213. Abutting surface; 41214. Groove; 4122. Non-Snap-fit ​​part; 413. Pull ring;

[0057] 42. Locking mechanism; 421. Stop; 4211. Pivot; 4212. Operating part; 4213. Stop; 4213a. Hook end; 4214. Wedge surface; 422. Support; 4221. Ear plate; 4222. Connecting plate; 423. Fixing base; 4231. Receiving cavity; 4232. First through hole; 4233. Second through hole; 424. Biasing element; 425. Pivot shaft;

[0058] 43. Guide component; 431a / 431b. Guide groove. Detailed Implementation

[0059] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0060] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0065] An embodiment of the present invention provides a child carrier and its backrest adjustment mechanism. The child carrier may be, for example, a stroller. (See reference...) Figures 1 to 4 The following description uses a stroller as an example to illustrate 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, allowing the angle θ of the backrest 3 relative to the seat 2 to be adjusted. The backrest adjustment device 4 is connected to both the frame 1 and the backrest 3 to achieve adjustment of the angle θ of the backrest 3 relative to the seat 2.

[0066] In one embodiment, such as Figures 1 to 4As shown, the backrest adjustment device 4 includes a strap assembly 41, a locking mechanism 42, and a guide 43. The guide 43 and the locking mechanism 42 are disposed on the backrest 3. The strap assembly 41 is connected to the frame 1 and passes through the guide 43 to connect with the locking mechanism 42. The locking mechanism 42 can cooperate with the strap assembly 41 to lock the strap assembly 41 in one direction at the required support length, thereby allowing the backrest 3 to be locked at the required angle θ and enabling the backrest to bear a certain weight. It should be noted that one-way locking means that the locking mechanism 42 allows the strap assembly 41 to move relative to the locking mechanism 42 in the D1 direction, that is, allows the strap assembly 41 to move in a direction that reduces the support 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 opposite direction to D1.

[0067] 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 may include, for example, webbing, leather straps, 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 support length of the strap assembly 41. The fixed ends 4112a, 4112b pass through the guide 43 and are connected to the frame 1 on opposite sides of the backrest 3 in the horizontal direction to support the backrest 3. The support length of the strap assembly 41 is defined by the sum of the lengths of the strap 411 between the guide 43 and the two fixed ends 4112a, 4112b. In this embodiment, the strap 411 is formed from a flexible strip, one end of which branches into two sub-ends, which respectively form two fixed ends 4112a and 4112b, and the end of the flexible strip away from the branch becomes a free end. In other embodiments, the strap 411 may be formed by connecting two flexible strips (e.g., by bonding, gluing, sewing, etc.), wherein the two ends of one flexible strip are respectively formed into two fixed ends 4112a and 4112b, and the end of the other flexible strip away from the connection between the two flexible strips forms a free end 4111.

[0068] In this embodiment, the pull ring 413 is connected to the free end 4111, allowing for easy pulling of the pull ring 413 to adjust the support length of the strap 411. The adjusting strap 412 is attached to the strap 411 and located between the guide 43 and the pull ring. In other embodiments, the adjusting strap 412 may be attached to the free end 4111 of the strap 411, and the pull ring 413 may be connected to the adjusting strap 412. Optionally, the adjusting strap 412 may be fixedly attached to the strap 411 by sewing, bonding, heat fusion, or other methods.

[0069] Continue to refer to Figures 5 to 7The adjustment band 412 includes a latching portion 4121 and a non-latching portion 4122. The non-latching portion 4122 has a flat surface, particularly a smooth surface. The latching portion 4121 includes a plurality of engagement protrusions 41211 configured to engage unidirectionally with the locking mechanism 42. In this embodiment, the engagement protrusions 41211 may be ratchet teeth. In other embodiments, the engagement protrusions may also be, for example, bosses, bumps, etc.

[0070] 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, allowing the strap assembly 41 to 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 the direction that reduces the support length of the strap assembly 41, that is, reduces the angle θ, so that the strap assembly 41 is unidirectionally locked at the required support length. This allows for convenient unidirectional adjustment of the support length of the strap assembly 41 to adjust the angle θ, while keeping the angle θ of the backrest 3 constant when bearing weight.

[0071] When the non-locking portion 4122 of the strap assembly 41 enters the locking mechanism 42, the non-locking portion 4122 slides with the locking mechanism 42, allowing the strap assembly 41 to 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. Within the stroke range corresponding to the non-locking portion, the strap assembly 41 can move freely relative to the locking mechanism 42 in the opposite direction of D1, increasing the supporting length of the strap assembly 41, or it can move relative to the locking mechanism 42 in the direction of D1, decreasing the supporting length of the strap assembly 41. Therefore, by adjusting the position and size of the non-locking portion 4122, when the angle θ between the backrest 3 and the seat 2 is within a preset undesired angle range, the backrest cannot be locked unidirectionally at that angle θ. In other words, by setting the non-locking portion 4122, the angle θ between the backrest 3 and the seat 2 can skip this undesired angle range, meaning the angle between the backrest 3 and the seat 2 cannot be locked within this undesired angle range. Specifically, the preset first angle and the preset second angle define the range of undesirable angles. For example, the preset first angle is 140°, the preset second angle is 155°, and the undesirable angle range is, for example, greater than the preset first angle and less than the preset second angle, i.e., the undesirable angle range is (140°, 155°). Through experiments, the inventors have found that when the angle θ between the backrest 3 and the seat 2 is within the aforementioned undesirable angle range, if the weight supported by the backrest 3 is large, such as when a child is leaning against the backrest 3, the child vehicle is prone to tipping over, posing a safety hazard. Therefore, it is necessary to ensure that the angle θ between the backrest 3 and the seat 2 avoids this undesirable angle range to reduce the safety hazard of the child vehicle.

[0072] In one embodiment, such as Figures 5 to 7As shown, the locking portion 4121 includes a first sub-locking portion 4121a and a second sub-locking portion 4121b. A non-locking portion 4122 is located between the first sub-locking portion 4121a and the second sub-locking portion 4121b. When the first sub-locking 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, i.e., θ ≤ 140°. When the second sub-locking 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 undesired angle range, i.e., θ ≥ 155°. When the non-locking part 4122 enters the locking mechanism 42, the angle θ between the backrest 3 and the seat 2 is within the undesired angle range (140°, 155°). Without external force or with a small external force applied to the backrest 3 (e.g., a light push), the backrest 3 rotates relative to the seat 2 to 155°, causing the second sub-locking part 4121b to enter and engage with the locking mechanism 42. In other words, the angle θ between the backrest 3 and the seat 2 can only be locked within a range less than or equal to 140° (e.g., 100°, 121.5°, 130°, etc.) or greater than or equal to 155° (e.g., 158.5°, 167°, 171°, etc.). This avoids adjusting the angle θ between the backrest 3 and the seat 2 within the undesired angle range, improving the stability of the child vehicle and reducing the safety hazard of tipping over.

[0073] In one embodiment, such as Figures 5 to 6 As shown, guide member 43 is fixed to backrest 3. Guide member 43 is provided with two guide grooves 431a and 431b. Fixed ends 4112a and 4112b of the strap assembly pass through guide grooves 431a and 431b respectively and are connected to the frame 1 on opposite sides of backrest 3 in the horizontal direction. The sum of the length of strap 411 between fixed end 4112a and guide groove 431a and the length of strap 411 between fixed end 4112b and guide groove 431b is the supporting length of strap 411. The two guide grooves 431a and 431b are symmetrically arranged on guide member 43. The extending direction of each guide groove 431a and 431b is at an angle to the moving direction of adjustment belt 412 (direction D1 and the opposite direction of D1), for example, 45° or 135°. In this embodiment, guide member 43 is made of a rigid material such as plastic or metal. In other embodiments, the guide 43 may be made of a flexible material such as fabric, leather, etc.

[0074] In one embodiment, such as Figures 7 to 8As shown, the locking mechanism 42 includes a stop 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 penetrates 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 through which the strap assembly 41 passes, and the second through hole 4233 penetrates the two opposite side walls of the receiving cavity 4231.

[0075] like Figures 7 to 8 As shown, the support 422 has two lugs 4221 and a connecting plate 4222 connecting the two lugs 4221. The two lugs 4221 are parallel to each other, and the connecting plate 4222 is located on the side of the two lugs 4221 away from the first through hole 4232. The support 422 is accommodated in the receiving cavity 4231 and connected to the backrest 3 through a 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 be omitted, and the support 422 may be directly fixed to the backrest 3.

[0076] like Figures 7 to 8 As shown, the stop 421 is configured to be switchable between a locked position and an unlocked position. The stop 421 includes a pivot portion 4211, an operating portion 4212, and a stop portion 4213. At least a portion of the stop 421 is located within a receiving cavity 4231 and is pivotally connected to a support 422. Specifically, the pivot portion 4211 of the stop 421 is pivotally connected between two lugs 4221 of the support 422 via a pivot shaft 425. The operating portion 4212 of the stop 421 extends out of the receiving cavity 4231 through a first through-hole 4232 to facilitate pivoting of the stop 421. The stop portion 4213 is disposed facing the connecting plate 4222 of the support 422. A strap assembly 41 passes through a second through-hole 4233 between the connecting plate 4222 and the stop portion 4213 of the stop 421. A biasing member 424 is connected between the pivot portion 425 of the stop 421 and the lug 4221 of the support 422. The biasing member 424 is adapted to bias the stop 421 to keep the stop 421 in a locked position. Specifically, the biasing member 424 applies a force to the stop 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 a compression spring, a pull ring, a spring sheet, rubber, or other elastic element.

[0077] Continue to refer to Figures 7 to 8The stop portion 4213 includes a hook end 4213a. When the stop member 421 is in the locked position, the stop portion 4213 can engage with the engaging portion 4121, that is, the hook end 4213a can engage with one of the multiple engaging protrusions 41211, so that the engaging portion 4121 can only move unidirectionally relative to the stop member 421 in the direction of D1, which shortens the support length, and cannot move in the opposite direction of D1, thereby unidirectionally locking the strap assembly 41 at the required support length. When the stop member 421 is in the unlocked position, the stop portion 4213 is released from engagement with the engaging portion 4121, and the movement of the engaging portion 4121 is not restricted by the locking mechanism 42, so that the engaging portion 4121 can move relative to the stop member 421 in both the direction of D1 and the opposite direction of D1. When the non-locking part 4122 engages with the stop part 4213, the non-locking part 4122 and the stop part 4213 are in a sliding engagement. At this time, the non-locking part 4122 can move relative to the stop part 421 in either the D1 direction or the opposite direction of D1. It should be noted that the sliding engagement of the non-locking part 4122 and the stop part 4213 includes: the non-locking part 4122 and the stop part 4213 are spaced apart or just in contact, or the non-locking part 4122 and the stop part 4213 abut against each other but the friction between them is small, so that when no external force is applied, or when a small external force is applied to the backrest 3 (e.g., a light push on the backrest 3), the non-locking part 4122 can move relative to the stop part 4213 in the opposite direction of D1.

[0078] Reference Figures 7 to 8The latch end 4213a is provided with a wedge-shaped surface 4214. Each engaging protrusion 41211 has a pushing surface 41212 and an abutting surface 41213. A groove 41214 is formed between two adjacent engaging protrusions 41211 to accommodate the latch end 4213a. When the latch end 4213a is engaged with the engaging protrusion 41211, when the adjusting band 412 is subjected to a force along the D1 direction, the pushing surface 41212 can pivot the stop 421 to the unlocking position by pushing against the wedge-shaped surface 4214, and the latch end 4213a exits the current groove 41214. When the current pushing surface 41212 moves to disengage from the wedge-shaped surface 4214, the stop pivots from the unlocking position to the locking position under the biasing action of the biasing member 424, and another groove adjacent to the current groove 41214. 41214 engages, thereby enabling the adjustment belt 412 to move along the D1 direction. 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 (e.g., a child leaning against the backrest 3), the strap assembly 41 is subjected to a force in the opposite direction of D1. At this time, the engaging protrusion 41211 of the strap assembly 41 is abutted by the hook end 4213a of the stop 421, and the stop 421 cannot pivot from the locked position to the unlocked position, so that the strap assembly 41 cannot move in the opposite direction of D1, which increases the support length. This achieves unidirectional locking of the strap assembly 41 at the required support length, that is, unidirectional locking of the backrest 3 at the required angle θ.

[0079] The operating principle of the backrest adjustment device 4 according to the embodiment of this application is as follows:

[0080] Reference Figure 7 When the engaging portion 4121 of the stop 421 engages with the stop portion 4213, if it is necessary to reduce the angle θ between the backrest 3 and the seat 2, the pull ring 413 is pulled along the D1 direction, thereby reducing the supporting length of the strap assembly 41. If it is necessary to increase the angle θ between the backrest 3 and the seat 2, a force F is applied to the operating portion 4212 of the stop 421, causing the stop portion 4213 to pivot away from the engaging portion 4121, and the hook end 4213a exits from the groove 41214, thus allowing the stop 421 to pivot from the locked position to the unlocked position. At this time, the strap assembly 41 can move 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 the desired angle θ, the external force F is released, and the stop 421 pivots to the locked position under the biasing action of the biasing member 424, thereby locking the strap assembly 41 in one direction at the desired support length.

[0081] 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 or leather. The adjustment strap 412 forms a locking portion 4121. The locking portion 4121 includes a plurality of engagement protrusions 41211 configured to engage unidirectionally with the stop portion 4213, thereby locking the strap assembly unidirectionally at the desired support length. The engagement protrusions 41211 may be at least one of ratchet teeth, bosses, or protrusions. The locking portion 4121 includes a first sub-locking portion 4121a and a second sub-locking portion 4121b. When the first sub-locking portion 4121a engages with the locking mechanism 42, the angle θ between the backrest 3 and the seat portion 2 is less than or equal to a minimum critical value defining the undesired angle range, i.e., θ ≤ 140°. When the second sub-engaging 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 undesired angle range, i.e., θ ≥ 155°. This embodiment differs from the previous embodiment in that the strap 411 forms a non-engaging portion 4122. The non-engaging portion 4122 has a lower coefficient of friction, allowing it to move bidirectionally relative to the stop member 421 in both the D1 direction and the opposite direction when engaged with the hook end 4213a. The non-engaging portion 4122 is located between the first sub-engaging portion 4121a and the second sub-engaging portion 4121b, thus preventing the angle between the backrest 3 and the seat 2 from being locked within the undesired angle range. In other embodiments, the frictional force of the engaging portion 4121 is greater than that of the non-engaging portion 4122. The locking part 4121 and the stop part 4213 can engage with a sufficiently large frictional force to lock the strap assembly in one direction at the required support length.

[0082] 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 or leather. The adjustment strap 412 forms a locking portion 4121 and a non-locking portion 4122. The frictional force of the locking portion 4121 is greater than that of the non-locking portion 4122. The locking portion 4121 and the stop portion 4213 can engage with a sufficiently large frictional force to lock the strap assembly unidirectionally at the desired support length. The stop portion 4213 of the stop 421 is a hook end 4213a to increase the frictional force between the locking portion 4121 and the hook end 4213a. The non-locking portion 4122 has a low coefficient of friction, allowing it to move bidirectionally relative to the stop 421 in both the D1 direction and the opposite direction when engaged with the hook end 4213a. The non-locking portion 4122 is located between the first sub-locking portion 4121a and the second sub-locking portion 4121b, thus preventing the angle of the backrest 3 relative to the seat 2 from being locked within the 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 fabric or leather. The strap 411 forms the locking portion 4121. The locking portion 4121 and the stop 4213 can engage with sufficiently large frictional force to lock the strap assembly unidirectionally at the desired support length. The stop part 4213 of the stop member 421 is a hook end 4213a to increase the friction between the engaging part 4121 and the hook end 4213a. Specifically, when the adjusting band 412 is subjected to an external force along the D1 direction, the engaging portion 4121 drives the hook end 4213a to rotate, reducing the pressure of the hook end 4213a on the engaging portion 4121, thereby reducing the friction between the hook end 4213a and the engaging portion 4121, and thus allowing the adjusting band 412 to move along the D1 direction. When the adjusting band 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 against the engaging portion 4121, increasing the pressure of the hook end 4213a on the engaging portion 4121, thereby increasing the friction between the hook end 4213a and the engaging portion 4121, and thus making the adjusting band 412 immovable in the opposite direction of D1. In some embodiments, the engaging portion 4121 may also be provided with protrusions to increase friction. The adjusting band 412 is made of a rigid, flat material, such as a plastic sheet. The adjusting band 412 forms a non-locking portion 4122. The non-locking portion 4122 slides in engagement with the stop 421. The surface of the non-locking portion 4122 is flat and smooth, allowing it to move bidirectionally relative to the stop 421 in both the D1 direction and the opposite direction when engaged with the hook end 4213a. The adjusting band 412 can be fixedly connected to the strap 411 by means of sewing, bonding, heat fusion, etc.The other components in this embodiment are the same as those in the above embodiment, and will not be described again here.

[0083] In other embodiments not shown, the strap assembly 41 includes a strap 411 made of materials such as webbing or leather. The strap 411 includes a locking portion 4121 and a non-locking portion 4122. The principle of one-way locking by engaging the locking portion 4121 with the stop 421 can be referred to in the above embodiments. The non-locking portion 4122 slides with the stop 421. The coefficient of friction of the non-locking portion 4122 is less than that of the locking portion 4121, so that when the non-locking portion 4122 engages with the hook end 4213a, the non-locking portion 4122 can move bidirectionally relative to the stop 421 in the D1 direction and the opposite direction. In other embodiments, the coefficient of friction of the non-locking portion 4122 may be the same as that of the locking portion 4121. The thickness of the non-locking portion 4122 is less than the thickness of the locking portion 4121, so that when the non-locking portion 4122 engages with the hook end 4213a, the non-locking portion 4122 is spaced apart from the locking portion 4122 or only contacts the locking portion 4122, thereby allowing the non-locking portion 4122 to move bidirectionally relative to the stop member 421 in the direction of D1 and the opposite direction of D1.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0085] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A child vehicle comprising a frame, a seat, a backrest, and a backrest adjustment device, the backrest adjustment device being used to adjust the angle of the backrest relative to the seat, characterized in that, The backrest adjustment device includes: A locking mechanism is provided on the backrest; and A strap assembly, connected to the frame of the child vehicle and having an adjustable support length, the strap assembly being provided with a locking part and a non-locking part; Both the engaging portion and the non-engaging portion are adapted to enter the locking mechanism. When the engaging portion enters the locking mechanism, the frictional force experienced by the engaging portion is greater than the frictional force experienced by the non-engaging portion when the non-engaging portion enters the locking mechanism.

2. The child vehicle according to claim 1, characterized in that: The locking mechanism includes a stop adapted to engage either the engaging portion or the non-engaging portion. The coefficient of friction of the non-locking portion is less than that of the locking portion.

3. The child vehicle according to claim 2, characterized in that, The coefficient of friction of the engaging portion is set to limit the sliding of the engaging portion relative to the stop to unidirectionally lock the strap assembly at the desired support length, and the coefficient of friction of the non-engaging portion is set to allow the non-engaging portion to slide into the stop so that the non-engaging portion can slide bidirectionally through the locking mechanism relative to the locking mechanism.

4. The child vehicle according to claim 3, characterized in that: The stop is pivotally arranged in the locking mechanism and can be switched between a locked position and an unlocked position; When the engaging portion enters the locking mechanism, when the stop is in the locked position, the stop contacts the engaging portion to unidirectionally lock the strap assembly at the desired support length, and when the stop is in the unlocked position, the stop disengages from the engaging portion to release the restriction on unidirectional movement of the strap assembly.

5. The child vehicle according to claim 4, characterized in that, When the non-locking portion enters the locking mechanism, the non-locking portion slides into the locking mechanism, allowing the non-locking portion to slide bidirectionally relative to the locking mechanism.

6. The child vehicle according to claim 1, characterized in that, The strap assembly includes: A strap extends from the frame through the locking mechanism disposed on the backrest to define the support length of the strap assembly; and An adjustment band is attached to the strap, and at least one of the locking portion and the non-locking portion is arranged on the adjustment band.

7. The child vehicle according to claim 6, characterized in that: One of the latching portion and the non-latching portion is arranged on the strap, and the other of the latching portion and the non-latching portion is arranged on the adjustment strap; or Both the engaging and non-engaging portions are arranged on the adjustment belt.

8. The child vehicle according to claim 1, characterized in that: The locking part includes a first locking part and a second locking part. The first locking part is configured to lock the angle of the backrest relative to the seat at a preset first angle, and the second locking part is configured to lock the angle of the backrest relative to the seat at a preset second angle. The non-locking portion is located between the first sub-locking portion and the second sub-locking portion.

9. A child vehicle comprising a frame, a seat, a backrest, and a backrest adjustment device, the backrest adjustment device being used to adjust the angle of the backrest relative to the seat, characterized in that, The backrest adjustment device includes: A locking mechanism is provided on the backrest; and A strap assembly, connected to the frame of the child vehicle and having an adjustable support length, the strap assembly being provided with a locking part and a non-locking part; The locking mechanism includes a stop, the engaging portion includes multiple engaging protrusions, the multiple engaging protrusions are configured to engage with the stop in one direction to lock the strap assembly in one direction at the required support length, and the non-engaging portion is configured to slide with the stop.

10. The child vehicle according to claim 9, characterized in that: The stop has a stop portion and is configured to pivot between a locked position and an unlocked position; When the engaging portion enters the locking mechanism, when the stop is in the locked position, the stop engages with one of the plurality of engaging protrusions to unidirectionally lock the strap assembly at the desired support length, and when the stop is in the unlocked position, the stop disengages from the engaging protrusion to release the unidirectional movement restriction on the strap assembly.

11. The child vehicle according to claim 10, characterized in that: The stop portion includes a hook end; Each of the plurality of engaging protrusions has a pushing surface and a contact surface, and a groove is formed between two adjacent engaging protrusions to accommodate the hook end.

12. The child vehicle according to claim 11, characterized in that, The hook end is provided with a wedge-shaped surface. When the hook end is engaged with the engaging protrusion, the pushing surface is adapted to pivot the stop member toward the unlocking position by pushing against the wedge-shaped surface.

13. The child vehicle according to claim 10, characterized in that, The locking mechanism also includes: Support, provided on the backrest; and A biasing member is disposed between the support and the stop, the biasing member being configured to bias the stop to hold the stop in the locked position; The stop is pivotally connected to the support, and either the engaging portion or the non-engaging portion passes through the locking mechanism between the support and the stop.

14. The child vehicle according to claim 10, 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; and The support is received within the receiving cavity through the opening and connected to the backrest through the fixing seat; A portion of the stop is located within the receiving cavity and is pivotally connected to the support, and either the engaging portion or the non-engaging portion passes through the locking mechanism between the support and the bottom wall of the receiving cavity; The bottom wall of the receiving cavity is provided with a first through hole, and another part of the stop extends out of the receiving cavity through the first through hole.

15. The child vehicle according to claim 14, characterized in that, The mounting base is provided with a second through hole through which the strap assembly passes. The second through hole penetrates the two opposite sidewalls of the receiving cavity, and either the engaging portion or the non-engaging portion passes through the second through hole.

16. The child vehicle according to claim 14, characterized in that, The support has two lugs and a connecting plate connecting the two lugs.

17. The child vehicle according to claim 16, characterized in that, The stop also includes a pivot part and an operating part. The pivot part is pivotally connected between the two lugs of the support via a pivot shaft. The operating part extends out of the receiving cavity through the first through hole. The stop part is disposed facing the connecting plate of the support.

18. The child vehicle according to claim 9, characterized in that: The strap has a free end and at least two fixed ends, the at least two fixed ends being connected to the frame on opposite sides of the back in a horizontal direction, and the free end being movable relative to the locking mechanism to adjust the support length of the strap assembly. The child vehicle also includes a guide member disposed on the backrest. The guide member has at least two guide grooves, and the at least two fixed ends pass through corresponding guide grooves in the at least two guide grooves and are connected to the frame on the opposite sides of the backrest.

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