Adjustment device and carrier

Abstract

The present invention provides an adjustment device for adjusting the distance between two components that is easy to operate, has a simple structure, and can be used reliably, as well as a carrier having the adjustment device. [Solution] An adjustment device comprising: a locking member having a locked position and an unlocked position; a fixed end; an operating end; and an adjustment member having at least two sliding contact portions and at least one locking portion located between the fixed end and the operating end, wherein the sliding contact portions and locking portions are alternately arranged, the sliding contact portions and the locking member are slidably engaged, thereby allowing the locking member to slide against the adjustment member at the sliding contact portions; when the locking member is in the locked position, the locking portions prevent the locking member from sliding against the adjustment member from one side away from the operating end of the locking portion toward the operating end; when the locking member is in the unlocked position, the locking member can slide against the adjustment member from one side away from the operating end of the locking portion toward the operating end.

Description

Technical Field

[0001] The present disclosure relates to the technical field of carriers, and more particularly to an adjusting device and a carrier to which the adjusting device is attached.

Background Art

[0002] Currently commonly used carriers, such as child carriers or pet carriers, specifically, baby strollers in child carriers, usually include a frame, a seat portion, and a backrest. When the baby stroller is in a deployed state, the frame and the seat portion are relatively fixed, and the backrest can rotate with respect to the frame and the seat portion, and the backrest is pivotally attached to the seat portion. Thus, the inclination angle of the backrest with respect to the seat portion can be adjusted according to different needs, and thereby the backrest can be adjusted to different shift positions with respect to the seat portion, such as an upright shift position, a semi-reclining position, and a full reclining position, etc. Therefore, a backrest inclination angle adjusting mechanism is generally installed in the baby stroller, and the backrest inclination angle adjusting mechanism is generally installed between the frame and the backrest, and by adjusting the distance between the frame and the backrest, the inclination angle of the backrest with respect to the seat portion is adjusted.

[0003] However, the currently installed backrest inclination angle adjusting mechanism between the frame and the backrest cannot quickly adjust the backrest between different shift positions, and moreover, it cannot effectively alert the user that the backrest has been adjusted to the desired shift position.

Summary of the Invention

[0004] An object of the present disclosure is to provide an adjusting device for adjusting the distance between two members that is easy to operate, has a simple structure, and can be surely used, and a carrier having the adjusting device.

[0005] According to a first aspect of the present disclosure, an adjustment device is provided, the adjustment device including a locking member having a locked position and an unlocked position, a fixed end, an operating end, and an adjustment member having at least two sliding contacts and at least one locking portion located between the fixed end and the operating end, wherein the sliding contacts and locking portions are alternately arranged, the sliding contacts and the locking member being slidably engaged, thereby allowing the locking member to slide against the adjustment member at the sliding contacts, the locking portion preventing the locking member from sliding against the adjustment member from one side away from the operating end of the locking portion toward the operating end when the locking member is in the locked position, and the locking member being able to slide against the adjustment member from one side away from the operating end of the locking portion toward the operating end when the locking member is in the unlocked position.

[0006] According to some embodiments of the present disclosure, the adjustment device further includes a housing through which an adjustment member is formed; a locking member moves relative to the housing between an unlocked position and a locked position; a gap is formed between the locking member and the housing through which the adjustment member is formed; when the locking member is in the locked position, the minimum width of the gap in a direction perpendicular to the extending direction of the passage is smaller than the maximum width of a locking portion located in the passage and larger than the maximum width of a sliding contact portion located in the passage; when the locking member is in the unlocked position, the minimum width of the gap in a direction perpendicular to the extending direction of the passage is greater than or equal to the maximum width of a locking portion located in the passage and larger than the maximum width of a sliding contact portion located in the passage.

[0007] According to some embodiments of this disclosure, the circumferential outer surface of the locking portion protrudes outward from the circumferential outer surface of the sliding contact portion.

[0008] According to some embodiments of the present disclosure, the housing is provided with a guide hole through which an adjustment member passes, and the locking member is provided with a locking hole through which an adjustment member passes, and the gap is the portion in which the locking hole and the guide hole overlap in the direction of extension of the passage.

[0009] According to some embodiments of the present disclosure, when the locking member is in the locked position, the minimum gap width is jointly limited by the hole wall adjacent to the sliding contact portion of the locking hole and the hole wall of the guide hole, the hole wall of the locking hole and the hole wall of the guide hole are located on opposite sides of the sliding contact portion in a direction perpendicular to the direction of extension of the passage.

[0010] According to some embodiments of the present disclosure, each locking portion has a sliding surface and a locking surface, the sliding surface being close to the operating end and the locking surface being close to the fixed end, the sliding surface being inclined with respect to the direction of movement of the locking member between the locked position and the unlocked position, the locking surface preventing the locking member from sliding against the adjustment member from one side away from the operating end of the locking portion toward the operating end when the locking member is in the locked position, and the sliding surface allowing the locking member to slide against the adjustment member from one side close to the operating end of the locking portion toward the fixed end, thereby moving from the locked position to the unlocked position.

[0011] According to some embodiments of the present disclosure, the adjustment device further includes a release member configured to drive a locking member from a locked position to an unlocked position, and a return member that constantly applies a force to the locking member to return the locking member to the locked position.

[0012] According to some embodiments of the present disclosure, the adjustment device is provided with a locking member having a first inclined surface inclined with respect to the direction of movement of the locking member between a locked position and an unlocked position, and a unlocking member having a second inclined surface inclined with respect to the direction of movement of the unlocking member, and the first inclined surface and the second inclined surface can contact each other and slide relative to each other, thereby converting the direction of movement of the unlocking member into the direction of movement of the locking member between a locked position and an unlocked position.

[0013] According to some embodiments of the present disclosure, the adjustment member is a pull cord, the sliding contact portion is the body of the pull cord, and the locking portion is formed by a knot in the pull cord.

[0014] A second aspect of the present disclosure provides a carrier to which the adjustment device described in any one of the above embodiments is attached, the carrier comprising: a seat; a backrest pivotably connected to the seat; and a frame to which the seat is fixed when the carrier is in an unfolded state, the fixed end being connected to the frame and the locking member being connected to the backrest.

[0015] The solution of this disclosure simplifies the adjustment method for adjusting the distance between two components in a carrier, allowing the user to quickly adjust the distance between the two components and to clearly know the distance between the two components, thereby improving the user experience. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a perspective view of a carrier to which an adjustment device according to a first embodiment of the present disclosure is attached. [Figure 2] Figure 2 is a perspective view of the adjustment device in Figure 1. [Figure 3] Figure 3 is a plan cross-sectional view of the adjustment device in Figure 2. [Figure 3A] Figure 3A is a magnified view of the adjustment device taken from Figure 3, and Figure 3A shows the locking member in the locked position. [Figure 3B] Figure 3B is a schematic diagram showing the locking member in the unlocked position as shown in Figure 3A. [Figure 4] Figure 4 is a perspective view of a carrier to which an adjustment device according to a second embodiment of the present disclosure is attached. [Figure 5] Figure 5 is a perspective view of the adjustment device shown in Figure 4. [Figure 6] Figure 6 is an exploded view of a part of the structure of the adjustment device shown in Figure 5. [Figure 7A] Figure 7A is a cross-sectional view of the locking member in the locked position as shown in Figure 5, Figure 7A is a rear cross-sectional view of the adjustment device, and Figure 7B is a top cross-sectional view of the adjustment device. [Figure 7B]FIG. 7B is a cross-sectional view of the locking member in the locked position in FIG. 5, FIG. 7A is a rear cross-sectional view of the adjusting device, and FIG. 7B is a top cross-sectional view of the adjusting device. [Figure 8A] FIG. 8A is a cross-sectional view of the locking member in the unlocked position in FIG. 5, FIG. 8A is a rear cross-sectional view of the adjusting device, and FIG. 8B is a top cross-sectional view of the adjusting device. [Figure 8B] FIG. 8B is a cross-sectional view of the locking member in the unlocked position in FIG. 5, FIG. 8A is a rear cross-sectional view of the adjusting device, and FIG. 8B is a top cross-sectional view of the adjusting device. [Figure 9] FIG. 9 is a perspective view of a carrier to which an adjusting device according to a third embodiment of the present disclosure is attached. [Figure 10] FIG. 10 is a perspective view of the adjusting device in FIG. 9. [Figure 11A] FIGS. 11AB are side cross-sectional views of the adjusting device in FIG. 10, FIG. 11A is a side cross-sectional view when the locking member is in the locked position, and FIG. 11B is a side cross-sectional view when the locking member is in the unlocked position. [Figure 11B] FIG. 11B is a side cross-sectional view of the adjusting device in FIG. 10, FIG. 11A is a side cross-sectional view when the locking member is in the locked position, and FIG. 11B is a side cross-sectional view when the locking member is in the unlocked position. [Figure 12] FIG. 12 is a perspective view of an adjusting device according to a fourth embodiment of the present disclosure.

MODE FOR CARRYING OUT THE INVENTION

[0017] The present disclosure will be described in detail below with reference to the drawings. The adjustment device according to the present disclosure is used to adjust the relative distance between a first member and a second member so as to maintain, decrease or increase the distance between the first member and the second member. The adjustment device of the present disclosure can be used in various carriers, such as infant carriers or pet carriers. Here, the infant carrier may be a stroller, a baby carrier, a child seat, a children's dining chair, etc., and the pet carrier may be a pet cart, a pet carrier, etc.

[0018] To describe the technical content and structural features of the present disclosure in detail, hereinafter, taking the carrier as a stroller, specific embodiments will be further described in combination with reference to FIGS. 1 to 12. Also, for the sake of easy understanding and explanation, the descriptions of the orientations such as front and rear, left and right, up and down in this specification are based on the orientation of the carrier during normal use (for example, when a child is sitting in the carrier, the direction the child is facing is taken as the front, and the direction the child's back is facing is taken as the rear, thereby determining the left, right, up and down). It should be understood that the present disclosure is not limited to these directions and can be adjusted according to the actual situation.

[0019] FIGS. 1, 4 and 9 respectively show perspective views of the carrier 1000 with the adjustment device 2000, the adjustment device 3000, and the adjustment device 4000 attached thereto. Note that, for the sake of simplicity, the assembly drawing of the carrier 1000 and the adjustment device 5000 shown in FIG. 12 is not shown, but it should be understood that the adjustment device 5000 can also be attached to the carrier 1000.

[0020] As shown in Figures 1, 4, and 9, the carrier 1000 includes a seat 1100, a backrest 1200, and a frame 1300. When the carrier 1000 is in the deployed state (as shown in Figures 1, 4, and 9), the seat 1100 is fixed to the frame 1300. Adjustment devices 2000, 3000, 4000, and 5000 may be used to connect the backrest 1200 and the frame 1300, i.e., the first member and the second member may be the backrest 1200 and the frame 1300, respectively, thereby maintaining, decreasing, or increasing the distance between the backrest 1200 and the frame 1300. Since the frame 1300 and the seat 1100 are fixed relative to each other, and the backrest 1200 and the seat 1100 are pivotally connected, the adjustment devices 2000, 3000, 4000, and 5000 are used to adjust the distance between the backrest 1200 and the frame 1300, and to adjust the inclination angle of the backrest 1200 relative to the seat 1100, thereby maintaining, decreasing, or increasing the inclination angle of the backrest 1200 relative to the seat 1100, and further adjusting the backrest 1200 to different shift positions for use by the user, specifically shift positions such as an upright shift position, a semi-reclined position, and a fully reclined position, thereby allowing the user to sit on the seat 1100 and lean against the backrest 1200 in an upright posture, a semi-reclined posture, or a fully reclined posture. A pivotable connection between the seat 1100 and the backrest 1200 can be achieved by connecting members such as a pivot shaft or hinge.

[0021] Figures 2, 5, 10, and 12 show perspective views of the adjustment devices 2000, 3000, 4000, and 5000, respectively. The adjustment devices 2000, 3000, 4000, and 5000 include adjustment members 2500, 3500, 4500, and 5500 fixed to the frame 1300 (i.e., the second member). Each adjustment member 2500, 3500, 4500, and 5500 has two or more sliding contact portions 2510, 3510, 4510, and 5510 and one or more locking portions 2520, 3520, 4520, and 5520, and the sliding contact portions 2510, 3510, 4510, and 5510 and the locking portions 2520, 3520, 4520, and 5520 are arranged alternately along the extending direction of the adjustment members 2500, 3500, 4500, and 5500, and has one locking portion 2520, 3520, 4520, and 5520 between two adjacent sliding contact portions 2510, 3510, 4510, and 5510. In other words, the sliding contact parts 2510, 3510, 4510, 5510 and the locking parts 2520, 3520, 4520, 5520 are arranged periodically. For example, one sliding contact part 2510, 3510, 4510, 5510 is followed by one locking part 2520, 3520, 4520, 5520, and so on. Selectively, as shown in Figures 2, 5, 10, and 12, the adjustment members 2500, 3500, 4500, and 5500 have four sliding contacts 2510, 3510, 4510, and 5510 and three locking parts 2520, 3520, 4520, and 5520, with the four sliding contacts 2510, 3510, 4510, and 5510 and the three locking parts 2520, 3520, 4520, and 5520 arranged alternately, and one locking part 2520, 3520, 4520, and 5520 between two adjacent sliding contacts 2510, 3510, 4510, and 5510. Furthermore, the circumferential outer surfaces of the locking portions 2520, 3520, 4520, and 5520 protrude outward more than the circumferential outer surfaces of the sliding contact portions 2510, 3510, 4510, and 5510.

[0022] As shown in Figures 2, 5, 10, and 12, the adjustment members 2500, 3500, 4500, and 5500 have fixed ends 2540, 3540, 4540, and 5540 and operating ends 2530, 3530, 4530, and 5530, while the multiple sliding contact parts 2510, 3510, 4510, and 5510 and the multiple locking parts 2520, 3520, 4520, and 5520 are located between the fixed ends 2540, 3540, 4540, and 5540 and the operating ends 2530, 3530, 4530, and 5530. Here, the fixed ends 2540, 3540, 4540, and 5540 are used to fix the device to the frame 1300 (i.e., the second member), while the operating ends 2530, 3530, 4530, and 5530 are used for operation by the user.

[0023] Figures 3-3B, 6-8B, and 11A-11B show the internal structure of the adjustment devices 2000, 3000, and 4000 in cross-sectional or exploded views, respectively. The adjustment devices 2000, 3000, and 4000 further include locking members 2200, 3200, and 4200, which are attached to the backrest 1200 (i.e., the first member) and have a locked position and an unlocked position. The sliding contact portions 2510, 3510, and 4510 are slidably engaged with the locking members 2200, 3200, and 4200, thereby allowing the locking members 2200, 3200, and 4200 to slide against the adjustment members 2500, 3500, and 4500 between the fixed ends 2540, 3540, and 4540 and the operating ends 2530, 3530, and 4530. When the locking members 2200, 3200, and 4200 are in the locked position, the locking parts 2520, 3520, and 4520 slide relative to the adjustment members 2500, 3500, and 4500 from the side away from the operating ends 2530, 3530, and 4530 of the locking parts 2520, 3520, and 4520 toward the operating ends 2530, 3530, and 4530. This prevents the locking members 2200, 3200, and 4200 from sliding toward the operating ends 2530, 3530, and 4530 of the locking parts 2520, 3520, and 4520 from the side away from the operating ends 2530, 3530, and 4530, and toward the operating ends 2530, 3530, and 4530, respectively. The internal structure of the adjustment device 5000 is the same as or similar to the internal structure of the adjustment device 4000, and therefore the internal structure of the adjustment device 5000 also includes a locking member that can be switched between a locked position and an unlocked position, and the sliding contact portion 5510 is slidably engaged with the locking member, so that the locking member can slide against the adjustment member 5500 between the fixed end 5540 and the operating end 5530, so that when in the locked position, it is prevented by the locking portion 5520 from sliding against the adjustment member 5500 from one side away from the operating end 5530 toward the operating end 5530, and when in the unlocked position, it is not prevented by the locking portion 5520 from sliding against the adjustment member 5500 from one side away from the operating end 5530 toward the operating end 5530.

[0024] When any of the sliding contact portions 2510, 3510, or 4510 slidably engage with the locking members 2200, 3200, or 4200, the locking members 2200, 3200, or 4200 can move relative to the adjustment members 2500, 3500, or 4500 toward the fixed ends 2540, 3540, or the operating ends 2530, 3530, or 4530, thereby moving toward the locking portion The distance between the material 2200 and the fixed ends 2540, 3540, and 4540 can be reduced or increased, and the distance between the backrest 1200 (i.e., the first member) and the frame 1300 (i.e., the second member) can also be reduced or increased, that is, the distance between the backrest 1200 (i.e., the first member) and the frame 1300 (i.e., the second member) can be changed within a predetermined range, thereby reducing or increasing the angle between the backrest 1200 and the seat 1100. When the locking members 2200, 3200, and 4200 are in the locked position, they are blocked by one of the multiple locking parts 2520, 3520, and 4520, so that the locking members 2200, 3200, and 4200 cannot slide from one side away from the operating ends 2530, 3530, and 4530 of the locking parts 2520, 3520, and 4520 toward the operating ends 2530, 3530, and so that the backrest 1200 (i.e., the first member) and the frame 1300 (i.e., To prevent the distance between the second member and the locking member 2200, 3200, 4200 from continuously increasing, when the locking member 2200, 3200, 4200 comes into contact with any one of the locking members 2520, 3520, 4520, the locking member 2200, 3200, 4200 is temporarily fixed to the adjustment member 2500, 3500, 4500, maintaining the distance between the locking member 2200 and the fixed end 2540, 3540, 4540 at a predetermined distance value, thereby positioning the backrest 1200 at a predetermined inclination angle relative to the seat 1100. In order for the locking members 2200, 3200, and 4200 to slide toward the operating ends 2530, 3530, and 4530 of the locking parts 2520, 3520, and 4520 from one side away from the operating ends 2530, 3530, and 4530, and not be blocked by the locking parts 2520, 3520, and 4520, it is necessary to move the locking members 2200, 3200, and 4200 from the locked position to the unlocked position.

[0025] As shown in Figures 1, 4, and 9, in the illustrated embodiment, the backrest 1200 and the seat 1100 are pivotally connected to each other, so the movement trajectories of the backrest 1200 and the locking members 2200, 3200, and 4200 fixed to the backrest 1200 are fixed, and the locking parts 2520, 3520, and 4520 are located on the trajectory in which the locking members 2200, 3200, and 4200 move from the fixed ends 2540, 3540, and 4540 toward the operating ends 2530, 3530, and 4530, preventing the locking members 2200, 3200, and 4200 from moving toward the operating ends 2530, 3530, and 4530.

[0026] According to the adjustment device of this disclosure, when the locking member moves from the fixed end toward the locking member and increases the distance between the locking member and the fixed end due to the alternating or periodic arrangement of the sliding contact portion and the locking portion, the locking member is blocked by the locking portion as quickly as possible due to the sliding engagement between the locking member and the sliding contact portion, the distance between the locking member and the fixed end reaches a predetermined distance value, and the blocking engagement between the locking member and the locking portion allows the user to clearly see that the distance between the locking member and the fixed end has reached a predetermined distance value.

[0027] As shown in Figures 2, 5, and 10, when the locking members 2200, 3200, and 4200 are in the locked position, as they move from the fixed ends 2540, 3540, and 4540 toward the operating ends 2530, 3530, and 4530, they are blocked by one of the three locking parts 2520, 3520, and 4520, thereby positioning the distance between the locking members 2200, 3200, and 4200 and the fixed ends 2540, 3540, and 4540 to one of three different distance values, and correspondingly positioning the backrest 1200 at three different inclination angles relative to the seat 1100, the three different inclination angles can correspond to the upright shift position, the semi-recline position, and the full-recline position of the backrest 1200. Between two adjacent locking portions 2520, 3520, and 4520, the locking members 2200, 3200, and 4200 slidably engage with the sliding contact portions 2510, 3510, and 4510, thereby allowing the locking members 2200, 3200, and 4200 to move quickly from one locking portion 2520, 3520, or 4520 toward the operating end 2530, 3530, or 4530 toward the other locking portion 2520, 3520, or 4520, enabling rapid adjustment and positioning of different distances between the locking members 2200, 3200, and 4200 and the fixed ends 2540, 3540, and 4540. Any one of the sliding contact portions 2510, 3510, or 4510 positioned between the two locking portions 2520, 3520, or 4520 has a predetermined length and a smooth surface, thereby allowing the locking members 2200, 3200, or 4200 to slide smoothly and stably over it. The specific predetermined length is determined based on the angle desired by the user as the inclination angle of the backrest 1200 relative to the frame 1300.

[0028] The specific solutions of the first embodiment will be described in detail below with reference to Figures 1 to 3B.

[0029] As shown in Figures 2-3B, the adjustment device 2000 includes a housing 2100, a locking member 2200, an unlocking member 2300, a return member 2400, and an adjustment member 2500. The housing 2100 defines a housing cavity 2110, and both the locking member 2200 and the return member 2400 are located within the housing cavity 2110. Selectively, the unlocking member 2300 is located partially within the housing cavity 2110 and partially protrudes from the housing 2100 for user operation, or the unlocking member 2300 is located entirely within the housing cavity 2110 and partially exposed from the housing 2100 for user operation (but not protruding from the housing). Specifically, the housing 2100 is fixed to the backrest 1200, the locking member 2200 is connected to the housing 2100, the locking member 2200 is attached to the backrest 1200 via the housing 2100 (as shown in Figure 1), and the locking member 2200 can move between a locked position and an unlocked position relative to the housing 2100. The housing 2100 has a first guide hole 2120 and a second guide hole 2130, the first guide hole 2120 and the second guide hole 2130 are located on different sides of the housing 2100 and communicate with the housing cavity 2110. An adjustment member 2500 is drilled in the housing 2100, the adjustment member 2500 is a flexible member that can undergo a certain degree of bending deformation, and the adjustment member 2500 has a fixed end 2540 fixed to the frame 1300 and an operating end 2530 extending outside the housing 2100. The operating end 2530 of the adjustment member 2500 is relatively close to the second guide hole 2130 and located outside the second guide hole 2130, while the fixed end 2540 is relatively close to the first guide hole 2120 and located outside the first guide hole 2120. Here, the dimensions of the operating end 2530 are larger than the dimensions of the second guide hole 2130, thereby preventing the adjustment member 2500 from being pulled into the housing 2100 through the second guide hole 2130.The sliding contact portion 2510 and the locking portion 2520 of the adjustment member 2500 are drilled in the housing 2100 through the first guide hole 2120 and the second guide hole 2130, in other words, the first guide hole 2120 and the second guide hole 2130 communicate with each other to form a passage through which the adjustment member 2500 passes, and the linear distance direction between the first guide hole 2120 and the second guide hole 2130 is the direction of extension of the passage through which the adjustment member 2500 passes (shown by the vertical dashed line in Figure 3), and since the adjustment member 2500 is made of a flexible material, the adjustment member 2500 can extend along the linear distance direction between the first guide hole 2120 and the second guide hole 2130. Selectively, the first guide hole 2120 and the second guide hole 2130 are provided opposite each other along a straight line. The locking member 2200 is located between the first guide hole 2120 and the second guide hole 2130 in the extending direction of the passage, and the locking member 2200 can be switched between a locked position and an unlocked position, and is configured to selectively move between the locked position and the unlocked position along a direction perpendicular to the extending direction of the passage. When the locking member 2200 is in the locked position, at least a portion of the locking member 2200 is located in the passage through which the adjustment member 2500 passes, and when the locking portion 2520 abuts against the locking member 2200 toward the operating end 2530, the locking member 2200 prevents the locking portion 2520 from moving away from the fixed end 2540 of the locking member 2200 toward the other side toward the fixed end 2540, in other words In other words, the locking portion 2520 prevents the locking member 2200 from moving from one side away from the operating end 2530 of the locking portion 2520 to the other side approaching the operating end 2530, but the locking member 2200 can slide-engage with the sliding contact portion 2510, that is, the locking member 2200 does not prevent the sliding contact portion 2510 from moving relative to the locking member 2200, that is, the locking member 2200 can move relative to the sliding contact portion 2510.When the locking member 2200 is in the unlocked position, the locking member 2200 is completely out of the passage through which the adjusting member 2500 passes, so that the locking member 2200 no longer prevents the adjusting member 2500 from moving relative to the locking member 2200, or in other words, the adjusting member 2500 no longer prevents the movement of the locking member 2200. The unlocking member 2300 is configured to drive the locking member 2200 from the locked position to the unlocked position. The return member 2400 is configured to constantly apply a force to the locking member 2200 to return it to the locked position.

[0030] A gap is formed between the locking member 2200 and the housing 2100 for the sliding contact portion 2510 of the adjustment member 2500 to pass through, and in a direction perpendicular to the extension direction of the passage, the minimum width W1 of the gap is greater than the maximum width W2 of the sliding contact portion 2510 located in the passage (selectively, the width of the sliding contact portion 2510 located in the passage in a direction perpendicular to the extension direction of the passage coincides with the extension direction of the sliding contact portion 2510, as shown in Figure 3). As can be understood, as the locking member 2200 moves between the locked position and the unlocked position, the minimum width W1 of the gap changes, but in any case W1 is greater than W2, so the locking member 2200 can move over the sliding contact portion 2510 without obstruction, i.e., the locking member 2200 can slidably engage with the sliding contact portion 2510. Furthermore, when in the locked position, in a direction perpendicular to the extension direction of the passage, the minimum width W1 of the gap is smaller than the maximum width of the locking portion 2520 located in the passage. As shown in Figure 3, the maximum width of the locking portion 2520 located in the passage is the width of the locking surface 2522, and the locking surface 2522 cannot penetrate the gap. This maintains or reduces only the distance between the backrest 1200 and the frame 1300, and maintains or reduces the angle between the backrest 1200 and the seat 1100. The minimum width W1 of the gap is larger than the maximum width W2 of the sliding contact portion 2510 located in the passage. Thus, in a direction perpendicular to the extension direction of the passage, the maximum width of the locking portion 2520 located in the passage is larger than the maximum width W2 of the sliding contact portion 2510 located in the passage. When in the unlocked position, the minimum width W1 of the gap is greater than the width of the locking surface 2522 of the locking part 2520 located in the passageway, and the locking surface 2522 can pass through the gap, thereby increasing or decreasing the distance between the backrest 1200 and the frame 1300, and maintaining or decreasing the angle between the backrest 1200 and the seat 1100, while at the same time the minimum width W1 of the gap is greater than the maximum width W2 of the sliding contact part 2510 located in the passageway.

[0031] Therefore, when in the locked position, the locking member 2200 can remain stationary relative to the adjustment member 2500 or move in the first direction, thereby maintaining or decreasing the distance between the backrest 1200 and the frame 1300, and maintaining or decreasing the angle between the seat 1100 and the backrest 1200. In other words, when in the locked position, the locking member 2200 forms a one-way lock with respect to the adjustment member 2500, and the locking member 2200 can still move along the first direction. When in the unlocked position, the locking member 2200 can move relative to the adjustment member 2500 in the first or second direction, thereby decreasing or increasing the distance between the backrest 1200 and the frame 1300, and further decreasing or increasing the angle between the seat 1100 and the backrest 1200, where the second direction is opposite to the first direction. The first direction described above means the direction from the operating end 2530 toward the fixed end 2540, and the second direction described above means the direction from the fixed end 2540 toward the operating end 2530. When the locking member 2200 moves in the first direction relative to the adjustment member 2500, the distance between the fixed end 2540 and the locking member 2200 decreases, and correspondingly, the length of the adjustment member 2500 between the fixed end 2540 and the locking member 2200 also decreases, and the angle between the backrest 1200 and the seat 1100 decreases (i.e., the backrest 1200 moves upward). When the locking member 2200 moves in the second direction relative to the adjustment member 2500, the distance between the fixed end 2540 and the locking member 2200 increases, and correspondingly, the length of the adjustment member 2500 between the fixed end 2540 and the locking member 2200 increases, and the angle between the backrest 1200 and the seat 1100 increases (i.e., the backrest 1200 moves downward).

[0032] On the one hand, such a one-way locking mechanism simplifies the backrest adjustment method, eliminating the need for the user to unlock the locking member, i.e., to move the locking member to the unlocked position. This allows for quick upward adjustment of the backrest angle, making it easy for the user to operate with one hand and improving operational efficiency. On the other hand, such a one-way locking mechanism only allows for one-way operation and therefore prevents risks that may arise from reverse operation (moving the backrest downward). For example, unintentional reverse operation may increase the length of the adjustment member between the frame and the locking member, increasing the distance of the backrest from the frame, or suddenly increasing the angle of the backrest from the seat, potentially injuring a child or pet sitting in the carrier due to the sudden downward movement of the backrest.

[0033] As shown in Figures 3 and 3A to 3B, each locking portion 2520 has a sliding surface 2521 and a locking surface 2522, with the sliding surface 2521 being close to the operating end 2530 and the locking surface 2522 being close to the fixed end 2540. Therefore, when the user pulls the operating end 2530 of the adjustment member 2500, causing the locking member 2200 to move along the first direction, the sliding surface 2521 first penetrates the guide hole of the housing 2100, and then the locking surface 2522 penetrates the guide hole, meaning that when the user pulls the operating end 2530 of the adjustment member 2500, the backrest 1200 can move upward. Conversely, when the user operates the unlocking member 2300 to move the locking member 2200 from the locked position to the unlocked position and unlock it, and as a result the locking member 2200 moves along the second direction, the locking surface 2522 first penetrates the guide hole of the housing 2100, and then the sliding surface 2521 penetrates the guide hole, that is, after the locking member 2200 is unlocked, the backrest 1200 can move downward.

[0034] The locking portion 2520 has a frustoconical shape that gradually narrows towards the operating end 2530, and the frustoconical includes a sliding surface 2521. For example, the locking portion 2520 consists of a substantially cylindrical body and a frustoconical, with the cylindrical body located closer to the fixed end 2540 and the frustoconical body located closer to the operating end 2530, with the locking surface 2522 being the base surface of the cylindrical body (closer to the fixed end 2540) and the sliding surface 2521 being the circumferential surface of the frustoconical. Alternatively, the locking portion 2520 as a whole is a frustoconical, i.e., the diameter of the locking portion gradually decreases along the second direction. In this case, the locking surface 2522 is the base surface of the frustoconical (closer to the fixed end 2540) and the sliding surface 2521 is the circumferential surface of the frustoconical. In either of the above cases, the locking portion 2520 has its maximum diameter at the locking surface 2522 and corresponds to the maximum width of the locking portion 2520 in a direction perpendicular to the extending direction of the passage. The diameter of the locking surface 2522 is less than or equal to the inner diameter of the first guide hole 2120 and less than or equal to the inner diameter of the second guide hole 2130, thereby allowing the locking portion 2520 to pass through the first guide hole 2120 and the second guide hole 2130 without obstruction. Due to the reduction in diameter, the sliding surface 2521 forms an inclined surface that forms a first angle α with respect to the extending direction of the passage through which the adjustment member 2500 passes.

[0035] When in the locked position, at least a portion of the locking member 2200 is located in a passage through which the adjustment member 2500 passes, one locking portion 2520 abuts against the locking member 2200 via the locking surface 2522, or the locking member 2200 is locked against the locking surface 2522, i.e., the locking member 2200 abuts against the locking surface 2522 toward the operating end 2530, thereby allowing the locking member 2200 to remain stationary relative to the adjustment member 2500 when no external force is applied. When the user applies a tensile force to the operating end 2530, the locking member 2200 moves along the first direction relative to the adjustment member 2500 to the other locking portion 2520, which engages with the locking member 2200 via the sliding surface 2521 and further pushes the locking member 2200, and the locking of the locking member 2200 by the locking surface 2522 can be temporarily released during the engagement process between the sliding surface 2521 and the locking member 2200, thereby allowing the locking member 2200 to move along the first direction relative to the other locking portion 2520. In the unlocked position, the locking member 2200 is completely displaced from the passage through which the adjustment member 2500 passes, there is no contact between the locking member 2200 and the locking portion 2520, and the locking member 2200 can move along the first and second directions relative to the adjustment member 2500.

[0036] The following will specifically describe the engagement mechanism between the locking portion 2520 of the adjustment member 2500 and the locking member 2200.

[0037] As shown in Figures 3 and 3A to 3B, the locking member 2200 includes a locking hole 2230, which penetrates the locking member 2200 along the direction of extension of the passage, and the adjustment member 2500 is drilled in the housing 2100 through the locking hole 2230, that is, the operating end 2530 penetrates the first guide hole 2120, the locking hole 2230 and the second guide hole 2130 in order to reach the outside of the housing 2100. The gap is the portion where the locking hole 2230 and the second guide hole 2130 overlap in the direction of extension of the passage. Specifically, as shown in Figures 3 and 3A, when in the locked position, the minimum width W1 of the gap is defined by both the hole wall of the lock hole 2230 adjacent to the sliding contact portion 2510 and the hole wall of the second guide hole 2130, where the hole walls of the lock hole 2230 and the hole walls of the second guide hole 2130 are located on the opposite side of the sliding contact portion 2510 in a direction perpendicular to the extending direction of the passage. As described above, since the minimum width W1 of the gap is greater than the maximum width W2 of the sliding contact portion 2510 located in the passage, the sliding contact portion 2510 can slide freely within the gap.

[0038] Furthermore, the locking member 2200 has a stopper surface 2210, which is the surface of the locking member 2200 that is close to the operating end 2530. Referring to Figures 3A and 3B, when in the locked position, the stopper surface 2210 abuts against the locking surface 2522, thereby preventing the locking member 2200 from moving along the second direction, and thus preventing the backrest 1200 from moving toward the operating end 2530. When in the unlocked position, the stopper surface 2210 and the locking surface 2522 are misaligned and separated, thereby allowing the backrest 1200 to move toward the operating end 2530 or the fixed end 2540.

[0039] Furthermore, the locking member 2200 has a sliding engagement surface 2220, which forms at least a portion of the peripheral wall of the locking hole 2230. When the user pulls the operating end 2530, the sliding engagement surface 2220 slides with the sliding surface 2521 of the locking portion 2520, driving the locking member 2200 against the restoring force of the return member 2400 to move toward the unlocked position, and the locking member 2200 passes over the locking portion 2520 in a first direction, thereby allowing the backrest 1200 to move toward the fixed end 2540. In this process, the locking member 2200 performs translational motion within the housing 2100, and both the sliding engagement surface 2220 and the sliding surface 2521 are inclined with respect to the direction of translational motion, and selectively, the direction of translational motion is perpendicular to the direction of extension of the passage. Furthermore, the sliding engagement surface 2220 forms a second clamping angle β with respect to the direction of extension of the passage, and the second clamping angle β is greater than or equal to (preferably equal to) the first clamping angle α.

[0040] In a direction perpendicular to the extension direction of the passage, the width of the lock hole 2230 itself (inner diameter in the case of a circular hole) is greater than or equal to the width of the locking surface 2522 of the locking portion 2520 in the passage (i.e., the diameter of the locking surface 2522), and therefore, when in the unlocked position, the locking portion 2520 can penetrate the first guide hole 2120, the lock hole 2230, and the second guide hole 2130. Specifically, when in the locked position, as shown in Figure 3A, the first guide hole 2120 and the second guide hole 2130 correspond to each other along the direction of passage extension, but the lock hole 2230 is partially offset from the first guide hole 2120 and the second guide hole 2130 along the direction of passage extension. The dimensions of the portion where the lock hole 2230 overlaps (i.e., corresponds) with the first guide hole 2120 and the second guide hole 2130 in the direction of passage extension are smaller than the diameter of the locking surface 2522 of the locking portion 2520. As a result, the locking surface 2522 of the locking portion 2520 abuts against the stopper surface 2210, thereby preventing the locking member 2200 from exceeding the locking portion 2520 along the second direction. Therefore, in the locked position, the locking member 2200 cannot move in the second direction, and the angle of the backrest 1200 relative to the seat 1100 cannot be increased, i.e., the backrest 1200 cannot move further downward. In the unlocked position, as shown in Figure 3B, the first guide hole 2120, the locking hole 2230 and the second guide hole 2130 correspond to each other along the extending direction of the passage, the minimum gap width W1 is greater than or equal to the maximum width of the locking portion 2520 in the passage, and the locking member 2200 can go beyond the locking portion 2520, i.e., move in the first or second direction relative to the entire adjustment member 2500, thereby adjusting the angle of the backrest 1200 relative to the seat 1100 (i.e., the backrest 1200 moves upward or downward). Selectively, the diameters of the first guide hole 2120, the locking hole 2230 and the second guide hole 2130 are the same.

[0041] As described above, the locking member 2200 having the locking hole 2230 forms a one-way lock with respect to the adjustment member 2500 when it is in the locked position by the stopper surface 2210 and the sliding engagement surface 2220, that is, the locking member 2200 can move along only the first direction and cannot move along the second direction.

[0042] As shown in Figures 1 to 3B, the adjustment device 2000 has two adjustment members 2500, each of which is connected to the left and right sides of the frame 1300, specifically to the left and right sides of the backrest 1200, and both pass through the same housing 2100 and the same locking member 2200. The housing 2100 is provided with a first guide hole 2230 and a second guide hole 2130 corresponding to each adjustment member 2500, and the locking member 2200 is provided with a locking hole 2230 corresponding to each adjustment member 2500. The fixed ends 2540 of each adjustment member 2500 are fixed to the frame 1300 on both sides of the backrest 1200, for example, by fixing loops.

[0043] As mentioned above, the unlocking member 2300 is configured to drive the locking member 2200 to move from the locked position to the unlocked position. The arrangement method of the unlocking member 2300 will be described below.

[0044] As shown in Figures 3A and 3B, the housing 2100 includes an opening 2140 communicating with the housing cavity 2110, and the unlocking member 2300 is movably received within the opening 2140. The unlocking member 2300 has a pressing end 2310 located outside the housing cavity 2110 and a contact end 2320 located inside the housing cavity 2110, the pressing end 2310 being configured to bias the locking member 2200 to move toward the unlocked position against the restoring force of the return member 2400.

[0045] As shown in Figures 3A-3B, the housing 2100 may include a front housing 2100a and a rear housing 2100b, which are connected to each other and define a housing cavity 2110. Furthermore, as shown in Figures 3A-3B, a hollow projection column 2150 is provided on the inner surface of the front housing 2100a, and the fasteners 2600 of the adjustment device 2000 are installed in the projection column 2150, fastening the front housing 2100a and the rear housing 2100b together, where the fasteners 2600 include, for example, bolts and nuts, or rivets. In addition, an opening 2140 for receiving the unlocking member 2300 may be provided in either the front housing 2100a or the rear housing 2100b. For example, in this embodiment, the opening 2140 is provided in the rear housing 2100b.

[0046] A portion of the unlocking member 2300 extends through the opening 2140 into the housing cavity 2110 and cooperates with the locking member 2200 to drive the locking member 2200 from the locked position to the unlocked position. The cooperative operation method between the unlocking member 2300 and the locking member 2200 will be described in detail below.

[0047] As shown in Figure 3, the locking member 2200 includes a connecting portion 2240 and a positioning portion 2250, and the connecting portion 2240 is configured to be fixedly connected to the unlocking member 2300. Specifically, when no external force is applied, the locking member 2200 is held in the locked position by the restoring force of the return member 2400. When the user presses the pressing end 2310 of the unlocking member 2300, the fixed connection between the connecting portion 2240 of the locking member 2200 and the unlocking member 2300 drives the unlocking member 2300 against the restoring force of the return member 2400, causing the locking member 2200 to move and move to the unlocked position.

[0048] As shown in Figures 3A to 3B, a first position regulating portion 2170 is provided on the inner surface of the housing 2100 (specifically the rear housing 2100b). A positioning portion 2250 is provided on the locking member 2200, and the positioning portion 2250 abuts against the first position regulating portion 2170 in the locked position in order to maintain the locking member 2200 in the locked position. For example, the positioning portion 2250 is a positioning hole formed in the locking member 2200, which penetrates the locking member 2200 along the direction of extension of the passage and is provided at a distance from the locking hole 2230 in a direction perpendicular to the direction of extension of the passage, and the first position regulating portion 2170 is located inside the positioning hole. When the locking member 2200 is in the locked position, the force acting on the return member 2400 causes the hole wall of the positioning hole to contact the first position restricting portion 2170 in a direction perpendicular to the extension direction of the passage (as shown in Figure 3A), thereby restricting the locking member 2200 to the locked position. When in the unlocked position, the hole wall of the positioning hole may be separated from the first position restricting portion 2170 or may be in contact with the first position restricting portion 2170 (as shown in Figure 3B). The hole wall of the positioning hole also contacts the first position restricting portion 2170 in the unlocked position. In this way, the engagement between the first position restricting portion 2170 and the positioning portion 2250 restricts the displacement range of the locking member 2200, preventing its displacement from exceeding the degree of elastic deformation of the return member 2400, preventing the return member 2400 from being unable to recover its deformation, or preventing the locking member 2200 and the return member 2400 from separating and becoming unable to contact each other, thus preventing the return member 2400 from being unable to apply force to the locking member. Furthermore, it is possible to prevent the entire adjustment device 2000 from becoming ineffective.

[0049] Furthermore, the first position restricting portion 2170 is also hollow, and the fastener 2600 is drilled inside it. Thus, the first position restricting portion 2170 not only performs a position restricting action on the locking member 2200, but may also be used to attach the fastener 2600, thereby making the internal structure of the housing 2100 more compact. Of course, the first position restricting portion 2170 does not have to be provided in the rear housing 2100b, and the fastener 2600 can be used as the first position restricting portion to restrict the displacement of the locking member 2200 between the locked position and the unlocked position. This contributes to reducing the number of internal parts of the housing 2100, thereby making the dimensions of the housing 2100 smaller, or providing more space for the adjustment member 2500 drilled inside the housing 2100 (in this case, it may be considered to use a thicker adjustment member 2500 to improve the load-bearing capacity and safety of the adjustment member 2500).

[0050] As shown in Figures 3-3B, the pressing end 2310 has a groove 2330, and the connecting portion 2240 is formed in a hook shape and extends into the groove 2330. Selectively, the opening direction of the groove 2330 is perpendicular to the direction of the pressing force. The engagement between the hook-shaped connecting portion 2240 and the groove 2330 causes the unlocking member 2300 to move to the unlocked position along the direction of the pressing force by driving the locking member 2200 against the restoring force of the return member 2400 under the action of the pressing force.

[0051] Furthermore, as shown in Figures 3A to 3B, the housing 2100 has a second position regulating portion 2180 on its inner surface, and the second position regulating portion 2180 and the contact end 2320 are spaced apart in a direction perpendicular to the extension direction of the passage, and the second position regulating portion 2180 and the contact end 2320 are used to regulate the position of the return member 2400. The return member 2400 includes an expansion spring located within the housing cavity 2110, one end of which abuts against the second position regulating portion 2180, and the other end which is fitted onto the contact end 2320 of the unlocking member 2300. In other words, the return member 2400 is installed between the housing 2100 and the locking member 2200, where the width of the contact end 2320 perpendicular to the extension direction of the passage is smaller than the width of the pressing end 2310 perpendicular to the extension direction of the passage, so that the other end of the spring fitted onto the contact end 2320 is regulated in position by the pressing end 2310. When the user presses the pressing end 2310 of the unlocking member 2300, the unlocking member 2300 moves inward towards the opening 2140 along the direction of the pressing force. This causes the expansion spring fitted to the contact end 2320 to compress toward the second position regulating portion 2180, accumulating energy. The locking member 2200, which cooperates with the unlocking member 2300 via the hook-shaped connecting portion 2240, moves to the unlocked position along the direction parallel to the pressing force, against the elastic force of the expansion spring. When the pressing force is removed, the expansion spring returns to its original state and drives the unlocking member 2300 toward the outside of the opening 2140, thereby driving the locking member 2200, which is hook-engaged with the unlocking member 2300, back to the locked position. Selectively, the expansion spring has a certain amount of pre-compression to ensure that the locking member 2200 is always held in the locked position.

[0052] The specific solutions of the second embodiment will be described in detail below with reference to Figures 4 to 8B.

[0053] As shown in Figures 5 and 6, the adjustment device 3000 includes a housing 3100, a locking member 3200, an unlocking member 3300, a return member 3400, and an adjustment member 3500. The housing 3100 defines a housing cavity 3110, and both the locking member 3200 and the return member 3400 are located within the housing cavity 3110. Selectively, the unlocking member 3300 is located partially within the housing cavity 3110, partially protruding from the housing 3100 for user operation, or the unlocking member 3300 is located entirely within the housing cavity 3110, partially exposed from the housing 3100 for user operation (but not protruding from the housing). Specifically, the housing 3100 is fixed to the backrest 3200, the locking member 3200 is connected to the housing 3100, the locking member 3200 is attached to the backrest 1200 via the housing 3100 (as shown in Figure 4), and the locking member 3200 can move between a locked position and an unlocked position relative to the housing 3100. The housing 3100 includes a first guide hole 3120 and a second guide hole 3130, the first guide hole 3120 and the second guide hole 3130 located on different sides of the housing 3100 and communicating with the housing cavity 3110. An adjustment member 3500 is drilled in the housing 3100, the adjustment member 3500 is a flexible member that can undergo a certain degree of bending deformation, and the adjustment member 3500 has a fixed end 3540 fixed to the frame 1300 and an operating end 3530 extending outside the housing 3100. The operating end 3530 of the adjustment member 3500 is relatively close to the second guide hole 3130 and located outside the second guide hole 3130, while the fixed end 3540 is relatively close to the first guide hole 3120 and located outside the first guide hole 3120. Here, the dimensions of the operating end 3530 are larger than the dimensions of the second guide hole 3130, thereby preventing the adjustment member 3500 from being pulled into the housing 3100 through the second guide hole 3130.The sliding contact portion 3510 and the locking portion 3520 of the adjustment member 3500 are drilled in the housing 3100 through the first guide hole 3120 and the second guide hole 3130, in other words, the first guide hole 3120 and the second guide hole 3130 communicate with each other to form a passage for the adjustment member 3500 to pass through, the linear distance direction between the first guide hole 3120 and the second guide hole 3130 is the direction of extension of the passage for the adjustment member 3500 to pass through, and since the adjustment member 3500 is made of a flexible material, the adjustment member 3500 can extend along the linear distance direction between the first guide hole 3120 and the second guide hole 3130. Selectively, the first guide hole 3120 and the second guide hole 3130 are provided opposite each other along a straight line. The locking member 3200 is located between the first guide hole 3120 and the second guide hole 3130 in the direction of extension of the passage, and the locking member 3200 can be switched between a locked position and an unlocked position, and is configured to selectively move between the locked position and the unlocked position along a direction perpendicular to the direction of extension of the passage. When the locking member 3200 is in the locked position, at least a portion of the locking member 3200 is located in the passage through which the adjustment member 3500 passes, and when the locking portion 3520 abuts against the locking member 3200 toward the operating end 3530, the locking member 3200 prevents the locking portion 2520 from moving away from the fixed end 3540 of the locking member 3200 to the other side approaching the fixed end 3540, or in other words, the locking portion 3520 prevents the locking member 3200 from moving away from the operating end 3530 of the locking portion 3520 to the other side approaching the operating end 3530. The locking member 3200 can slide-engage with the sliding contact portion 3510, that is, the locking member 3200 does not prevent the sliding contact portion 3510 from moving relative to the locking member 3200, that is, the locking member 3200 can move relative to the sliding contact portion 3510, and when the locking member 3200 is in the unlocked position, the locking member 3200 is completely out of the passage through which the adjustment member 2500 passes, so that the locking member 2200 no longer prevents the adjustment member 2500 from moving relative to the locking member 2200, in other words, the adjustment member 2500 no longer prevents the movement of the locking member 2200.The unlocking member 3300 is configured to drive the locking member 3200 to move it from the locked position to the unlocked position. The return member 3400 is configured to constantly apply a force to the locking member 3200 to return it to the locked position.

[0054] A gap is formed between the locking member 3200 and the housing 3100 for the sliding contact portion 3510 of the adjustment member 3500 to pass through, and in a direction perpendicular to the extending direction of the passage, the minimum width W1 of the gap is greater than the maximum width W2 of the sliding contact portion 3510 located in the passage (selectively, the width of the sliding contact portion 3510 located in the passage in a direction perpendicular to the extending direction of the passage coincides with the extending direction of the sliding contact portion 3510, as shown in Figure 7B). As can be understood, as the locking member 3200 moves between the locked position and the unlocked position, the minimum width W1 of the gap changes, but in any case W1 is greater than W2, so the locking member 3200 can move over the sliding contact portion 3510 without obstruction, i.e., the locking member 3200 can slidably engage with the sliding contact portion 3510. Furthermore, when in the locked position, in a direction perpendicular to the extension direction of the passage, the minimum width W1 of the gap is smaller than the maximum width of the locking portion 3520 located in the passage. As shown in Figure 7B, the maximum width of the locking portion 3520 located in the passage is the width of the locking surface 3522, and the locking surface 3522 cannot penetrate the gap. This maintains or reduces only the distance between the backrest 1200 and the frame 1300, and at the same time maintains or reduces the angle between the backrest 1200 and the seat 1100. The minimum width W1 of the gap is larger than the maximum width W2 of the sliding contact portion 3510 located in the passage. Thus, in a direction perpendicular to the extension direction of the passage, the maximum width of the locking portion 3520 located in the passage is larger than the maximum width W2 of the sliding contact portion 3510 located in the passage. When in the unlocked position, the minimum width W1 of the gap is greater than the width of the locking surface 3522 of the locking part 3520 located in the passageway, and the locking surface 3522 can pass through the gap, thereby increasing or decreasing the distance between the backrest 1200 and the frame 1300, and at the same time maintaining or decreasing the angle between the backrest 1200 and the seat 1100, and at the same time the minimum width W1 of the gap is greater than the maximum width W2 of the sliding contact part 3510 located in the passageway.

[0055] Therefore, when in the locked position, the locking member 3200 can remain stationary relative to the adjustment member 3500 or move in the first direction, thereby maintaining or decreasing the distance between the backrest 1200 and the frame 1300, and maintaining or decreasing the angle between the seat 1100 and the backrest 1200. In other words, when in the locked position, the locking member 3200 forms a one-way lock with respect to the adjustment member 3500, and the locking member 3200 can still move along the first direction. When in the unlocked position, the locking member 3200 can move relative to the adjustment member 3500 in the first or second direction, thereby decreasing or increasing the distance between the backrest 1200 and the frame 1300, and further decreasing or increasing the angle between the seat 1100 and the backrest 1200, where the second direction is opposite to the first direction. The first direction described above means the direction from the operating end 3530 toward the fixed end 3540, and the second direction described above means the direction from the fixed end 3540 toward the operating end 3530. When the locking member 3200 moves in the first direction relative to the adjustment member 3500, the distance between the fixed end 3540 and the locking member 3200 decreases, and correspondingly, the length of the adjustment member 3500 between the fixed end 3540 and the locking member 3200 also decreases, and the angle between the backrest 1200 and the seat 1100 decreases (i.e., the backrest 1200 moves upward). When the locking member 3200 moves in the second direction relative to the adjustment member 3500, the distance between the fixed end 3540 and the locking member 3200 increases, and correspondingly, the length of the adjustment member 3500 between the fixed end 3540 and the locking member 3200 increases, and the angle between the backrest 1200 and the seat 1100 increases (i.e., the backrest 1200 moves downward).

[0056] As shown in Figures 7B and 8B, each locking portion 3520 has a sliding surface 3521 and a locking surface 3522, with the sliding surface 3521 being close to the operating end 3530 and the locking surface 3522 being close to the fixed end 3540. Therefore, when the user pulls the operating end 3530 of the adjustment member 3500, causing the locking member 3200 to move along the first direction, the sliding surface 3521 first passes through the guide hole of the housing 3100, and then the locking surface 3522 passes through the guide hole, meaning that when the user pulls the operating end 3530 of the adjustment member 3500, the backrest 1200 can move upward. Conversely, when the user operates the unlocking member 3300 to move the locking member 3200 from the locked position to the unlocked position and unlock it, and as a result the locking member 3200 moves along the second direction, the locking surface 3522 first penetrates the guide hole of the housing 3100, and then the sliding surface 3521 penetrates the guide hole, that is, after the locking member 3200 is unlocked, the backrest 1200 can move downward.

[0057] The locking portion 3520 has a frustoconical shape that gradually narrows towards the operating end 3530, and the frustoconical includes a sliding surface 3521. For example, the locking portion 3520 consists of a substantially cylindrical body and a frustoconical, with the cylindrical body located closer to the fixed end 3540 and the frustoconical body located closer to the operating end 3530, with the locking surface 3522 being the base surface of the cylindrical body (closer to the fixed end 3540) and the sliding surface 3521 being the circumferential surface of the frustoconical. Alternatively, the locking portion 3520 is a frustoconical body as a whole, that is, the diameter of the locking portion gradually decreases along the second direction, in which case the locking surface 3522 is the base surface of the frustoconical (closer to the fixed end 3540) and the sliding surface 3521 is the circumferential surface of the frustoconical. In either of the above cases, the locking portion 3520 has its maximum diameter at the locking surface 3522 and corresponds to the maximum width of the locking portion 3520 in a direction perpendicular to the extending direction of the passage. The diameter of the locking surface 3522 is less than or equal to the inner diameter of the first guide hole 3120 and less than or equal to the inner diameter of the second guide hole 3130, thereby allowing the locking portion 3520 to pass through the first guide hole 3120 and the second guide hole 3130 without obstruction.

[0058] When in the locked position, at least a portion of the locking member 3200 is located in a passage through which the adjustment member 3500 passes, one locking portion 3520 abuts against the locking member 3200 via the locking surface 3522, or the locking member 3200 is locked against the locking surface 3522, that is, the locking member 3200 abuts against the locking surface 3522 toward the operating end 3530, thereby allowing the locking member 3200 to remain stationary relative to the adjustment member 3500 when no external force is applied. When the user applies a tensile force to the operating end 3530, the locking member 2200 moves along the first direction relative to the adjustment member 3500 to the other locking portion 3520, which then engages with the locking member 3200 via the sliding surface 3521, further pushing the locking member 3200. The locking of the locking surface 3522 with respect to the locking member 3200 can be temporarily released during the engagement process between the sliding surface 3521 and the locking member 3200, thereby allowing the locking member 3200 to move along the first direction relative to the other locking portion 3520. In the unlocked position, the locking member 3200 is completely displaced from the passage through which the adjustment member 2500 passes, eliminating contact between the locking member 3200 and the locking portion 3520, and allowing the locking member 3200 to move along the first and second directions relative to the adjustment member 3500.

[0059] The following will specifically describe the engagement mechanism between the locking portion 3520 of the adjustment member 3500 and the locking member 3200.

[0060] As shown in Figure 6, the locking member 3200 includes a locking hole 3230 which penetrates the locking member 3200 along the direction of extension of the passage, and the adjustment member 3500 is drilled in the housing 3100 through the locking hole 3230, that is, the operating end 3530 passes through the first guide hole 3120, the locking hole 3230 and the second guide hole 3130 in order to reach the outside of the housing 3100. The gap is the portion where the locking hole 3230 and the second guide hole 3130 overlap in the direction of extension of the passage. Specifically, as shown in Figure 7B, when in the locked position, the width W1 of the gap is defined by both the hole wall of the lock hole 3230 adjacent to the sliding contact portion 3510 and the hole wall of the second guide hole 3130, where the hole walls of the lock hole 3230 and the hole walls of the second guide hole 3130 are located on the opposite side of the sliding contact portion 3510 in a direction perpendicular to the extending direction of the passage. As described above, since the width W1 of the gap is greater than the width W2 of the sliding contact portion 3510 located in the passage, the sliding contact portion 3510 can slide freely in the gap.

[0061] Furthermore, the locking member 3200 has a stopper surface 3210, which is the surface of the locking member 3200 that is close to the operating end 3530. Referring to Figures 7B and 8B, when in the locked position, the stopper surface 3210 abuts against the locking surface 3522, thereby preventing the locking member 3200 from moving along the second direction, and thus preventing the backrest 1200 from moving toward the operating end 3530. When in the unlocked position, the stopper surface 3210 and the locking surface 3522 are separated by displacement, thereby allowing the backrest 1200 to move toward the operating end 3530 or the fixed end 3540.

[0062] Furthermore, although the locking member 3200 does not have a sliding engagement surface that slidably engages with the sliding surface 3521, as can be understood, the edge of the hole wall of the locking hole 3230 of the locking member 3200 can still slidably engage with the sliding surface 3521, thereby driving the locking member 3200 against the restoring force of the return member 3400 to move toward the unlocked position, the locking member 3200 passing over the locking portion 3520 in the first direction, thereby allowing the housing 3100 to further move the backrest 1200 toward the fixed end 3540. In this process, the locking member 3200 performs translational motion within the housing 3100, the sliding surface 3521 is inclined with respect to the direction of translational motion, and selectively, the direction of translational motion is perpendicular to the direction of extension of the passage.

[0063] In a direction perpendicular to the extension direction of the passage, the width of the lock hole 3230 itself (inner diameter in the case of a circular hole) is greater than or equal to the width of the locking surface 3522 of the locking portion 3520 in the passage (i.e., the diameter of the locking surface 3522). Therefore, when in the unlocked position, the locking portion 3520 can penetrate the first guide hole 3120, the lock hole 3230, and the second guide hole 3130. Specifically, when in the locked position, as shown in Figure 7B, the first guide hole 3120 and the second guide hole 3130 correspond to each other along the direction of passage extension, but the lock hole 3230 is partially offset from the first guide hole 3120 and the second guide hole 3130 along the direction of passage extension. The dimensions of the portion where the lock hole 3230 overlaps (i.e., corresponds) with the first guide hole 3120 and the second guide hole 3130 in the direction of passage extension are smaller than the diameter of the locking surface 3522 of the locking portion 3520. As a result, the locking surface 3522 of the locking portion 3520 abuts against the stopper surface 3210, thereby preventing the locking member 3200 from exceeding the locking portion 3520 along the second direction. Therefore, in the locked position, the locking member 3200 cannot move in the second direction, and the angle of the backrest 1200 relative to the seat 1100 cannot be increased, i.e., the backrest 1200 cannot move further downward. In the unlocked position, as shown in Figure 8B, the first guide hole 3120, the locking hole 3230 and the second guide hole 3130 correspond to each other along the extending direction of the passage, the gap width W1 is greater than or equal to the maximum width of the locking portion 3520 in the passage, and the locking member 3200 can go beyond the locking portion 3520, i.e., move in the first or second direction relative to the entire adjustment member 3500, thereby adjusting the angle of the backrest 1200 relative to the seat 1100 (i.e., the backrest 1200 moves upward or downward). Selectively, the diameters of the first guide hole 3120, the locking hole 3230 and the second guide hole 3130 are the same.

[0064] Similarly, the locking member 3200 having the locking hole 3230 forms a one-way lock with respect to the adjustment member 3500 when in the locked position, that is, the locking member 3200 can move along only the first direction and cannot move along the second direction.

[0065] As shown in Figures 4, 5, 7B, and 8B, the adjustment device 3000 has two adjustment members 3500, each of which is connected to the left and right sides of the frame 1300, specifically to the left and right sides of the backrest 1200, and both pass through the same housing 3100 and the same locking member 3200. The housing 3100 is provided with a first guide hole 3230 and a second guide hole 3130, corresponding to each adjustment member 3500, and the locking member 3200 is provided with a locking hole 3230, corresponding to each adjustment member 3500. The fixed ends 3540 of each adjustment member 3500 are fixed to the frame 1300 on both sides of the backrest 1200, for example, by fixing loops.

[0066] As mentioned above, the unlocking member 3300 is configured to drive the locking member 3200 to move from the locked position to the unlocked position. The method of arranging the unlocking member 3300 will be described below.

[0067] As shown in Figures 5 and 6, the housing 3100 includes an opening 3140 that communicates with the housing cavity 3110, and the unlocking member 3300 is movably received within the opening 3140. The unlocking member 3300 has a pressing end 3310 located outside the housing cavity 3110 and a contact end 3320 located inside the housing cavity 3110, the pressing end 3310 being configured to bias the locking member 3200 to move toward the unlocked position against the restoring force of the return member 3400.

[0068] As shown in Figure 6, the housing 3100 may include a front housing 3100a and a rear housing 3100b, which are connected to each other and define a housing cavity 3110. The front housing 3100a includes a first notch 3141, and the rear housing 4100b includes a second notch 3142, and the first notch 3141 and the second notch 3142 combine to form an opening 3140.

[0069] As shown in Figures 6 and 7A, the inner surface of one of the front housing 3100a and the rear housing 3100b (for example, the rear housing 3100b) has a plurality of hollow projections 3150, and the inner surface of the other (for example, the front housing 3100a) has a plurality of hollow projections 3160, with the plurality of projections 3160 arranged in a one-to-one correspondence with the plurality of projections 3150. The adjustment device 3000 is provided with a plurality of fasteners (not shown), each fastener correspondingly passing through the opposing projections 3160 and projection columns 3150, thereby fastening the front housing 3100a and the rear housing 3100b together, where the fasteners include, for example, bolts and nuts, or rivets. Furthermore, this disclosure does not limit the number of projection columns 3150, projections 3160, and fasteners.

[0070] A portion of the unlocking member 3300 extends through the opening 3140 into the housing cavity 3110 and cooperates with the locking member 3200 to drive the locking member 3200 from the locked position to the unlocked position. The cooperative operation method between the unlocking member 3300 and the locking member 3200 will be described in detail below.

[0071] As shown in Figures 6, 7A, and 8A, the locking member 3200 includes a connecting portion 3240 and a positioning portion 3250, and the connecting portion 3240 is configured to specifically contact the unlocking member 3300 so as to be movably connected to it. Specifically, when no external force is applied, the locking member 3200 is held in the locked position by the restoring force of the return member 3400, and when the user presses the pressing end 3310 of the unlocking member 3300, the contact between the connecting portion 3240 of the locking member 3200 and the unlocking member 3300 drives the unlocking member 3300 to move against the restoring force of the return member 3400, moving it to the unlocked position. The movable connection between the connecting portion 3240 and the unlocking member 3300 does not need to exist when the locking member 3200 is in the locked position; that is, the connecting portion 3240 and the unlocking member 3300 are installed with a gap between them, and after the unlocking member 3300 moves a certain distance, the unlocking member 3300 is movably connected to the connecting portion 3240.

[0072] Specifically, the connecting portion 3240 is provided with a first inclined surface 3270 that is inclined with respect to the direction of movement of the locking member 3200 and the pressing direction of the unlocking member 3300, and the abutting end 3320 has a second inclined surface 3350 that is inclined with respect to the direction of movement of the locking member 3200 and the pressing direction of the unlocking member 3300. The first inclined surface 3270 and the second inclined surface 3350 abut each other and can slide relative to each other, thereby converting the movement of the unlocking member 3300 along the pressing direction into sliding in the direction of movement of the locking member 3200. The inclination of the first inclined surface 3270 coincides with the inclination of the second inclined surface 3350. The sliding engagement between the first inclined surface 3270 and the second inclined surface 3350 causes the unlocking member 3300, under the action of a pressing force, to drive the locking member 3200 to the unlocked position against the restoring force of the return member 3400. Due to the inclined surface engagement, the movement of the locking member 3200 is further restricted by other components (described later), and the direction of movement of the locking member 3200 is perpendicular to the direction of movement of the unlocking member 3300.

[0073] In this case, as shown in Figure 6, the locking member 3200 also includes two corresponding locking holes 3230, and the first inclined surface 3270 (shown in Figure 7A) formed on the connecting portion 3240 is located between the two locking holes 3230. Specifically, the portion of the locking member 3200 located between the two locking holes 3210 is partially thinned in the direction of the passage extension to provide space for the contact end 3320 of the unlocking member 3300, and forms the first inclined surface 3270 which slidably engages with the second inclined surface 3350 of the contact end 3320. Since the first inclined surface 3270 is formed between the two locking holes 3230 and is located approximately in the middle of the locking member 3200, when the contact end 3320 cooperates to push the locking member 3200 through the inclined surface, the force received by the entire locking member 3200 can be made more uniform, thereby allowing for smoother movement when switching between the locked position and the unlocked position.

[0074] As shown in Figures 7A and 8A, a first position restricting portion 3170 is provided on the inner surface of the housing 3100 (specifically the front housing 3100a). The locking member 3200 is provided with a positioning portion 3250, which contacts the first position restricting portion 3170 in the locked position to maintain the locking member 3200 in the locked position. For example, the positioning portion 3250 is a projection formed to extend from the body of the locking member 3200. When the locking member 3200 is in the locked position, the positioning portion 3250 contacts the first position restricting portion 3170 in a direction perpendicular to the extension direction of the passage (as shown in Figure 7A), thereby restricting the locking member 3200 to the locked position. When in the unlocked position, the positioning portion 3250 is separated from the first position restricting portion 3170 (as shown in Figure 8A). In this way, the engagement between the first position restricting portion 3170 and the positioning portion 3250 restricts the locked position of the locking member 3200, preventing the locking member 3200 and the return member 3400 from separating and coming into contact, thus preventing the return member 3400 from applying force to the locking member and avoiding the entire device becoming inoperable.

[0075] Furthermore, Figures 7A and 8A also show a second position regulating portion 3180 on the inner surface of the front housing 3100a, the second position regulating portion 3180 and the positioning portion 3250 are spaced apart in a direction perpendicular to the extension direction of the passage, and the second position regulating portion 3180 and the positioning portion 3250 are used to regulate the position of the return member 3400. The return member 3400 includes an expansion and contraction spring located within the housing cavity 3110, one end of which abuts against the second position regulating portion 3180 and the other end which is fitted into the positioning portion 3250 of the locking member 3200, i.e., the return member 3400 is installed between the housing 3100 and the locking member 3200. Selectively, the positioning portion 3250 is L-shaped, and the other end of the expansion and contraction spring is fitted into the lateral leg of the L shape and secured by the longitudinal leg of the L shape. When the user presses the pressing end 3310 of the unlocking member 3300, the unlocking member 3300 moves inward toward the opening 3140 along the direction of the pressing force, and the locking member 3200, which forms an inclined engagement with the unlocking member 3300, moves to the unlocked position along a direction perpendicular to the pressing force, against the elastic force of the expansion and contraction spring. At this time, the positioning portion 3250 of the locking member 3200 moves away from the first position restricting portion 3170, thereby driving the expansion and contraction spring fitted onto the positioning portion 3250 to compress toward the second position restricting portion 3180 and store energy. When the pressing force disappears, the expansion and contraction spring returns to its original state, driving the positioning portion 3250 to move toward the first position restricting portion 3170, thereby returning the entire locking member 3200 to the locked position. At this time, the unlocking member 3300, which forms an inclined engagement with the locking member 3200, is biased to move outward toward the opening 3140. Selectively, the expansion spring has a certain amount of pre-compression to better always hold the locking member 3200 in the locked position.

[0076] Furthermore, as shown in Figures 7A and 8A, the inner surface of the front housing 3100a is further provided with a third position restricting portion 3190 and a fourth position restricting portion 3191 for restricting the displacement range of the unlocking member 3300. The intermediate portion of the unlocking member 3300, located between the pressing end 3310 and the contact end 3320, forms a flange 3340, which is located within the housing cavity 3110. The dimensions of the opening 3140 are greater than or equal to the dimensions of the pressing end 3310 and less than the dimensions of the flange 3340. Both the third position restricting portion 3190 and the fourth position restricting portion 3191 protrude beyond the main body of the front housing 3100a along the direction of passage extension and abut against the flange 3340, thereby restricting the vertical displacement of the unlocking member 3300 after it has been mounted laterally to the front housing 3100a, and preventing the unlocking member from being completely detached from the housing 3100a in the vertical direction.

[0077] Specifically, when used to apply a pressing force to the pressing end 3310, the pressing end 3310 can move in the direction of entering the opening 3140, and at this time, the third position restricting part 3190 contacts the flange 3340 to restrict the limit position to which the unlocking member 3300 will move downward. When the pressing force is lost, the positioning part 3250 moves in the direction of the first position restricting part 3170 by the action of the return member 3400, driving the entire locking member 3200 to return to the locked position and driving the unlocking member 3300 to move backward, and in this case, the fourth position restricting part 3191 contacts the flange 3340 to restrict the limit position to which the unlocking member 3300 will move upward. The third position restricting part 3190 and the fourth position restricting part 3191 further have a guiding function when the unlocking member 3300 moves up and down.

[0078] Selectively, the inner surface of the front housing 3100a does not need to have a fourth position restricting portion 3191. This is because, when the unlocking member 3300 moves upward, the flange 3340 returns to the opening 3140, and since the dimensions of the flange 3340 are larger than the dimensions of the opening 3140, the flange 3340 abuts against the edge of the opening 3140, preventing further movement of the unlocking member 3300 and preventing the unlocking member from detaching upward from the front housing 3100a through the opening 3140.

[0079] Furthermore, as shown in Figures 6, 7A, and 8A, the inner surface of the housing 3100 further has guide grooves 3192, specifically, guide grooves 3192 are provided on the inner surface of both the front housing 3100a and the rear housing 3100b, and the locking member 3200 has a guide rib 3260 on at least one of its front and rear surfaces, the guide rib 3260 is movably engaged in the corresponding guide groove 3192, where the front and rear surfaces of the locking member 3200 are two surfaces facing each other in the direction of the extension of its passage. When the locking member 3200 is switched between the locked position and the unlocked position under the action of an external force applied by the user or a restoring force applied by the return member 3400, the locking member 3200 moves along the guide groove 3192 by the engagement of the guide rib 3260 with the guide groove 3192. The engagement of the guide rib 3260 with the guide groove 3192 allows the locking member 3200 to move along a predetermined path, ensuring smooth position switching. Selectively, the guide groove 3192 extends along the left-right direction (which is also the longitudinal direction of the locking member 3200), as shown in the figure. Selectively, the guide groove 3192 is defined by at least two baffles provided on the inner surface of the housing 3100, which is advantageous in ensuring the structural strength and stability of the housing 3100 compared to a method of forming the guide groove by partially recessing the inner surface of the housing (i.e., reducing the thickness of a part of the housing).

[0080] The following method can be used when assembling the adjustment device. First, the front housing 3100a is placed upside down on the base surface, then the locking member 3200, the return member 3400, and the unlocking member 3300 are attached to the front housing 3100a, then the rear housing 3100b is placed over the front housing 3100a, and finally the fasteners are attached to the front housing 3100a and the rear housing 3100b. The fourth position regulating part 3191 protrudes toward the rear housing 3100b beyond the groove wall of the guide groove 3192, better guiding the assembly of the front housing 3100a and the rear housing 3100b.

[0081] The specific solutions of the third embodiment will be described in detail below with reference to Figures 9 to 11B.

[0082] Figures 9-10 are perspective views showing the external structure of the adjustment device 4000. Figures 11A-11B are cross-sectional views showing the internal structure of the adjustment device 4000. The adjustment device 4000 includes a housing 4100, a locking member 4200, an unlocking member 4300, a return member 4400, and an adjustment member 4500. The housing 4100 defines a housing cavity 4110, and optionally, the housing 4100 may include a front housing 4100a and a rear housing 4100b, which are connected to each other to define the housing cavity 4110. Both the locking member 4200 and the return member 4400 are located within the housing cavity 4110, and optionally, the unlocking member 4300 is partially located within the housing cavity 4110 and partially protrudes from the housing 4100 for user operation, or the unlocking member 4300 is fully located within the housing cavity 4110 and partially exposed from the housing 4100 for user operation (but not protruding from the housing). Specifically, the housing 4100 is fixed to the backrest 4200, the locking member 4200 is connected to the housing 4100, and the locking member 4200 is attached to the backrest 1200 via the housing 4100 (as shown in Figure 9). The housing 4100 includes a first guide hole 4120 and a second guide hole 4130, the first and second guide holes located on different sides of the housing 4100 and communicating with the housing cavity 4110. The adjustment member 4500 is drilled into the housing 4100 and is a flexible member that can undergo a certain degree of bending deformation. The adjustment member 4500 has a fixed end 4540 fixed to the frame 1300 and an operating end 4530 extending outside the housing 4100. The operating end 4530 of the adjustment member 4500 is relatively close to the second guide hole 4130 and located outside the second guide hole 4130, and the fixed end 4540 is relatively close to the first guide hole 4120 and located outside the first guide hole 4120. Here, the dimensions of the operating end 4530 are larger than the dimensions of the second guide hole 4130, thereby preventing the adjustment member 4500 from being pulled into the housing 4100 through the second guide hole 4130.The sliding contact portion 4510 and the locking portion 4520 of the adjustment member 4500 are drilled in the housing 4100 through the first guide hole 4120 and the second guide hole 4130, in other words, the first guide hole 4120 and the second guide hole 4130 communicate with each other to form a passage for the adjustment member 4500 to pass through, and the linear distance direction between the first guide hole 4120 and the second guide hole 4130 is the direction of extension of the passage for the adjustment member 4500 to pass through (shown in Figure 11A), and since the adjustment member 4500 is made of a flexible material, the adjustment member 4500 can extend along the linear distance direction between the first guide hole 4120 and the second guide hole 4130. The locking member 4200 is configured to be switchable between a locked position and an unlocked position. When the locking member 4200 is in the locked position, at least a portion of the locking member 4200 is located in the passage through which the adjustment member 4500 passes, and when the locking portion 4520 abuts against the locking member 4200 toward the operating end 4530, the locking member 4200 prevents the locking portion 4520 from moving away from the fixed end 4540 of the locking member 4200 to the other side approaching the fixed end 4540, in other words, In other words, the locking portion 4520 prevents the locking member 4200 from moving from one side away from the operating end 4530 to the other side approaching the operating end 4530, but the locking member 4200 can slide-engage with the sliding contact portion 4510, that is, the locking member 4200 does not prevent the sliding contact portion 4510 from moving relative to the locking member 4200, that is, the locking member 4200 can move relative to the sliding contact portion 4510. When the locking member 4200 is in the unlocked position, the locking member 4200 is completely out of the passage through which the adjustment member 4500 passes, and as a result the locking member 4200 no longer prevents the adjustment member 4500 from moving relative to the locking member 4200, in other words, the adjustment member 4500 no longer prevents the movement of the locking member 4200. The unlocking member 4300 is configured to drive the locking member 4200 to move from the locked position to the unlocked position. The return member 4400 is configured to constantly apply a force to the locking member 4200 that returns the locking member 4200 to the locked position.

[0083] A gap is formed between the locking member 4200 and the housing 4100 for the sliding contact portion 4510 of the adjustment member 4500 to pass through, and in a direction perpendicular to the extension direction of the passage, the minimum width W1 of the gap is greater than the maximum width W2 of the sliding contact portion 4510 located in the passage (selectively, the width of the sliding contact portion 4510 located in the passage in a direction perpendicular to the extension direction of the passage coincides with the extension direction of the sliding contact portion 4510, as shown in Figure 11A). As can be understood, as the locking member 4200 moves between the locked position and the unlocked position, the minimum width W1 of the gap changes, but in any case W1 is greater than W2, so the locking member 4200 can move over the sliding contact portion 4510 without obstruction, i.e., the locking member 4200 can slidably engage with the sliding contact portion 4510. Furthermore, when in the locked position, the minimum width W1 of the gap in a direction perpendicular to the extension direction of the passage is smaller than the maximum width of the locking portion 4520 located in the passage. As shown in Figure 11A, the maximum width of the locking portion 4520 located in the passage is the width of the locking surface 4522, and the locking surface 4522 cannot penetrate the gap. This maintains or reduces only the distance between the backrest 1200 and the frame 1300, and maintains or reduces the angle between the backrest 1200 and the seat 1100. Thus, in a direction perpendicular to the extension direction of the passage, the maximum width of the locking portion 4520 located in the passage is larger than the maximum width W2 of the sliding contact portion 4510 located in the passage. When in the unlocked position, the width W1 of the gap is greater than the width of the locking surface 4522 of the locking part 4520 located in the passageway, allowing the locking surface 4522 to pass through the gap, thereby increasing or decreasing the distance between the backrest 1200 and the frame 1300, and maintaining or decreasing the angle between the backrest 1200 and the seat 1100.

[0084] Therefore, when in the locked position, the locking member 4200 can remain stationary relative to the adjustment member 4500 or move in the first direction, thereby maintaining or decreasing the distance between the backrest 1200 and the frame 1300, and maintaining or decreasing the angle between the seat 1100 and the backrest 1200. In other words, when in the locked position, the locking member 4200 forms a one-way lock with respect to the adjustment member 4500, and the locking member 4200 can still move along the first direction. When in the unlocked position, the locking member 4200 can move relative to the adjustment member 4500 in the first or second direction, thereby decreasing or increasing the distance between the backrest 1200 and the frame 1300, and further decreasing or increasing the angle between the seat 1100 and the backrest 1200, where the second direction is opposite to the first direction. The first direction described above means the direction from the operating end 4530 toward the fixed end 4540, and the second direction described above means the direction from the fixed end 4540 toward the operating end 4530. When the locking member 4200 moves in the first direction relative to the adjustment member 4500, the distance between the fixed end 4540 and the locking member 4200 decreases, and correspondingly, the length of the adjustment member 4500 between the fixed end 4540 and the locking member 4200 also decreases, and the angle between the backrest 1200 and the seat 1100 decreases (i.e., the backrest 1200 moves upward). When the locking member 4200 moves in the second direction relative to the adjustment member 4500, the distance between the fixed end 4540 and the locking member 4200 increases, and correspondingly, the length of the adjustment member 4500 between the fixed end 4540 and the locking member 4200 increases, and the angle between the backrest 1200 and the seat 1100 increases (i.e., the backrest 1200 moves downward).

[0085] As shown in Figures 11A to 11B, each locking portion 4520 has a sliding surface 4521 and a locking surface 4522, with the sliding surface 4521 being close to the operating end 4530 and the locking surface 4522 being close to the fixed end 4540. Therefore, when the user pulls the operating end 4530 of the adjustment member 4500, causing the locking member 4200 to move along the first direction, the sliding surface 4521 first penetrates the guide hole of the housing 4100, and then the locking surface 4522 penetrates the guide hole, meaning that when the user pulls the operating end 4530 of the adjustment member 4500, the backrest 1200 can move upward. Conversely, when the user operates the unlocking member 4300 to move the locking member 4200 from the locked position to the unlocked position and unlock it, and as a result the locking member 4200 moves along the second direction, the locking surface 4522 first penetrates the guide hole of the housing 4100, and then the sliding surface 4521 penetrates the guide hole, that is, after the locking member 4200 is unlocked, the backrest 1200 can move downward.

[0086] The locking portion 4520 has a frustoconical shape that gradually narrows towards the operating end 4530, and the frustoconical includes a sliding surface 4521. For example, the locking portion 4520 consists of a substantially cylindrical body and a frustoconical, with the cylindrical body located closer to the fixed end 4540 and the frustoconical body located closer to the operating end 4530, with the locking surface 4522 being the base surface of the cylindrical body (closer to the fixed end 4540) and the sliding surface 4521 being the circumferential surface of the frustoconical. Alternatively, the locking portion 4520 as a whole is a frustoconical, i.e., the diameter of the locking portion gradually decreases along the second direction. In this case, the locking surface 4522 is the base surface of the frustoconical (closer to the fixed end 4540) and the sliding surface 4521 is the circumferential surface of the frustoconical. In either of the above cases, the locking portion 4520 has its maximum diameter at the locking surface 4522 and corresponds to the maximum width of the locking portion 4520 in a direction perpendicular to the extending direction of the passage. The diameter of the locking surface 4522 is less than or equal to the inner diameter of the first guide hole 4120 and less than or equal to the inner diameter of the second guide hole 4130, thereby allowing the locking portion 4520 to pass through the first guide hole 4120 and the second guide hole 4130 without obstruction. Due to the reduction in diameter, the sliding surface 4521 forms an inclined surface that forms a first angle α with the extending direction of the passage through which the adjustment member 4500 passes.

[0087] When in the locked position, at least a portion of the locking member 4200 is located in a passage through which the adjustment member 4500 passes, one locking portion 4520 abuts against the locking member 4200 via the locking surface 4522, or the locking member 4200 is locked against the locking surface 4522, i.e., the locking member 4200 abuts against the locking surface 4522 toward the operating end 4530, thereby allowing the locking member 4200 to remain stationary relative to the adjustment member 4500 when no external force is applied. When the user applies a tensile force to the operating end 4530, the locking member 4200 moves along the first direction relative to the adjustment member 4500 to the other locking portion 4520, which engages with the locking member 4200 via the sliding surface 4521 and further pushes the locking member 4200, and the locking of the locking surface 4522 with respect to the locking member 4200 can be temporarily released during the engagement process between the sliding surface 4521 and the locking member 4200, thereby allowing the locking member 4200 to move along the first direction relative to the other locking portion 2520. In the unlocked position, the locking member 4200 is completely out of the passage for the adjustment member 4500 to pass through, there is no contact between the locking member 4200 and the locking portion 4520, and the locking member 4200 can move along the first and second directions relative to the adjustment member 4500.

[0088] The following will specifically describe the engagement mechanism between the locking portion 4520 of the adjustment member 4500 and the locking member 4200.

[0089] As shown in Figures 11A to 11B, the locking member 4200 includes the locking end 4280, and the adjustment member 4500 penetrates the housing 4100 and is sandwiched between the locking end 4280 and the housing 4100. The width W1 of the gap is defined, when in the locked position, by the side surface of the locking end 4280 adjacent to the sliding contact portion 4510 and the inner surface of the housing 4100 (or front housing 4100a), where the side surface of the locking end 4280 and the inner surface of the housing 4100 are located opposite the sliding contact portion 4510 in a direction perpendicular to the extension direction of the passage. Specifically, as shown in Figure 11A, when in the locked position, the width W1 of the gap is defined by the inner surface of the front housing 4100a and the side of the lock end 4280 closest to the front housing 4100a. Since the width W1 of the gap is greater than the width W2 of the sliding contact portion 4510 located in the passage, the lock end 4280 can slide freely within the gap.

[0090] The locking member 4200 (specifically the locking end 4280) can be switched between a locked position and an unlocked position. The locking end 4280 can contact the locking portion 4520 when in the locked position and separates from the locking portion 4520 when in the unlocked position. Specifically, the locking end 4280 includes a stopper surface 4210 and a sliding engagement surface 4220. As shown in Figures 11A to 11B, when in the locked position, the stopper surface 4210 contacts the locking surface 4522, thereby preventing the locking member 4200 from moving beyond the locking portion 4520 along the second direction, and thus preventing the housing 4100 from moving, and further preventing the backrest 1200 from moving toward the operating end 4530. When in the unlocked position, the stopper surface 4210 and the locking surface 4522 become misaligned and separate, thereby allowing the backrest 1200 to move toward the operating end 4530 or the fixed end 4540.

[0091] Furthermore, the sliding engagement surface 4220 is configured to slide-engage with the sliding surface 4521 of the locking portion 4520 when the lock end 4280 is in the locked position. Specifically, when the user pulls the operating end 4530, the sliding engagement surface 4220 slides into engagement with the sliding surface 4521 of the locking portion 4520, pushing the locking member 4200 against the restoring force of the return member 4400 and moving it toward the unlocked position, causing the locking member 4200 to move beyond the locking portion 4520 in a first direction, thereby allowing the housing 4100 and consequently the backrest 1200 to move toward the fixed end 4540. Both the sliding engagement surface 4220 and the sliding surface 4521 are inclined with respect to the direction of passage extension in the locked position. As shown in Figure 11A, a second clamping angle β is formed between the sliding engagement surface 4220 and the extension direction of the passage, and the second clamping angle β is greater than or equal to (preferably equal to) the first clamping angle α.

[0092] As described above, the locking member 4200 constituting the locking end 4280 forms a unidirectional lock with respect to the adjustment member 4500 when it is in the locked position due to the stopper surface 4210 and the sliding engagement surface 4220. That is, the locking member 4200 can move along only the first direction and cannot move along the second direction.

[0093] As shown in Figures 9-10, the adjustment device 4000 has two adjustment members 4500, each of which is connected to the left and right sides of the frame 1300, specifically to the left and right sides of the backrest 1200, and both pass through the same housing 4100 and are located on one side of the same locking member 4200. Specifically, the housing 4100 is provided with a first guide hole 4120 corresponding to each adjustment member 4500, and the sliding contact portion 4510 and locking portion 4520 of the two adjustment members 4500 enter the housing cavity 4110 through the corresponding first guide hole 4120 and exit the housing 4100 from the housing cavity 4110 through the same second guide hole 4130. Specifically, the first guide hole 4120 is provided on both the left and right sides of the housing 4100, and the second guide hole 4130 is provided on the upper side of the housing 4100, meaning that the operating ends 4530 of the two adjustment members 4500 can move upward of the housing 4100 through the first guide hole 4120 and the second guide hole 4130.

[0094] As mentioned above, the unlocking member 4300 is configured to drive the locking member 4200 to move from the locked position to the unlocked position. The method of arranging the unlocking member 4300 will be described below.

[0095] As shown in Figures 10 to 11B, the housing 4100 includes an opening 4140 communicating with the housing cavity 4110, and the unlocking member 4300 is movably received within the opening 4140. The unlocking member 4300 includes a pressing end 4310 located outside the housing cavity 4110 and a contact end 4320 located in the opening 4140. The pressing end 4310 is configured to drive the locking member 4200 against the restoring force of the return member 4400, thereby biasing it toward the unlocked position.

[0096] As shown in Figures 10 to 11B, the housing 4100 may include a front housing 4100a and a rear housing 4100b, which are connected to each other and define a housing cavity 4110. An opening 4140 for receiving the unlocking member 4300 may be provided in either the front housing 4100a or the rear housing 4100b, but this embodiment is not limited thereto. Since the description of the previous embodiment is also applicable to this embodiment, a description of the specific structure and modifications of the housing 4100 will be omitted.

[0097] The unlocking member 4300 further includes an insertion portion 4360 configured to enter the housing cavity 4110 through the opening 4140 when the unlocking member 4300 is moved from the locked position to the unlocked position. The cooperative operation method between the unlocking member 4300 and the locking member 4200 will be described in detail below.

[0098] The locking member 4200 is installed as a rotatable ratchet, which includes a locking end 4280. The unlocking member 4300 is configured separately from or integrally with the locking member 4200 at its contact end 4320. The return member 4400 is a torsion spring and is installed within the locking member 4200. As shown in Figure 11A, when no external force is applied, the locking end 4280 contacts the locking surface 4522 via the stopper surface 4210 under the elastic force of the torsion spring, and the contact end 4320 of the unlocking member 4300 contacts the edge of the opening 4140, defining the locked position of the locking member 4200. As shown in Figure 11B, when an external force is present, 1) when the user presses the pressing end 4310 of the unlocking member 4300, the unlocking member 4300 drives the locking member 4200 against the elastic force of the torsion spring, rotating it to the unlocked position. At this time, the locking member 4200 can move relative to the adjustment member 4200 along the first or second direction. 2) When the user pulls the operating end 4530, the sliding surface 4521 of the locking portion 4520 slidably engages with the sliding engagement surface 4220 of the locking end 4280, thereby driving the locking member 4200 to rotate toward the unlocked position against the elastic force of the torsion spring. At this time, the unlocking member 4300 also rotates, and the insertion portion 4360 enters the housing cavity 4110 through the opening 4140. When the user pulls the operating end 4530, the locking member 4200 can move toward the adjustment member 4200 along the first direction. The locking member 4200 pivots when the locking end 4280 switches between the locked position and the unlocked position.

[0099] Selectively, the insertion portion 4360 is configured to have at least a partially arc-shaped outer surface, and the edge of the opening 4140 is chamfered, so that when the insertion portion 4360 rotates toward the interior of the housing 4100, the insertion portion 4360 can smoothly enter the housing cavity 4110 due to the fit between its arc-shaped outer surface and the chamfered edge of the opening.

[0100] The specific solutions of the fourth embodiment will be described in detail below with reference to Figure 12.

[0101] Figure 12 is a perspective view of an adjustment device 5000 according to a fourth embodiment of the present disclosure. The main difference between this embodiment and the third embodiment is that two operating ends 5530 are connected to form a single node, allowing the user to pull both adjustment members 5500 through this node, preventing the user from forgetting to pull one of the operating ends 5530. Otherwise, the length between the fixed end 5540 and the locking member of the unpulled adjustment member 5500 would not change, resulting in an imbalance in the load-bearing on both sides of the backrest 1200, which could cause the backrest 1200 to tilt, posing a safety risk to children or pets sitting in the carrier 1000. Preferably, as shown in Figure 12, the adjustment member 5500 has a pull-ring shape formed on the operating end 5530, further facilitating the user to pull the adjustment member and enabling convenient and quick backrest adjustment.

[0102] Selectively, the adjustment device 5000 includes a single adjustment member 5500, the ends of which are fixed to the frame 1300 as fixed ends 5540, and the intermediate position of the adjustment member 5500 functions as an operating end 5530. During the manufacturing process, it is assumed that the ends of the adjustment member 5500 first pass through a second guide hole 5130 and then through a first guide hole 5120, thereby being fixed to the frame 1300, for example, by a fixing loop. This makes the operation simple and quick, as the user only needs to pull the intermediate position of the adjustment member 5500 when adjusting the backrest 1200. However, as with the other embodiments described above, the dimensions of the operating end 5530 are larger than the dimensions of the second guide hole 5130 to prevent the adjustment member 5500 from being pulled into the housing 5100 through the second guide hole 5130.

[0103] Selectively, the adjustment device 5000 includes a plurality of separate adjustment members 5500 to increase the overall strength of the adjustment members. Correspondingly, the housing 5100 includes a plurality of first guide holes 5120 and a plurality of second guide holes 5130, which are used for the plurality of adjustment members to pass through, respectively. Although only two adjustment members are schematically shown in the figure, it should be understood that more than two adjustment members are also possible. Specifically, the frame 1300 may be provided with a plurality of fixing points (for example, two on the left side and two on the right side), the fixed ends of the plurality of adjustment members may be connected to these fixing points, and the operating ends may pass through the first guide holes and second guide holes in the housing, respectively. In this case, if the locking member has a configuration with locking holes, there may also be a plurality of locking holes, for example, they may be arranged in two rows on both the left and right sides of the first inclined surface, or they may be arranged to encircle the first inclined surface. This disclosure is not specifically limited thereto.

[0104] In this embodiment, the adjustment member 5500 is a pull cord, the sliding contact portion 5510 is the body of the pull cord, and the locking portion 5520 is directly formed by the knot of the pull cord. The maximum width of the locking portion 5520 located within the passage of the adjustment member 5500 in the housing, in a direction perpendicular to the extension direction of the passage, is greater than the maximum width of the sliding contact portion 5510 located within the passage of the adjustment member 5500 in the housing, in a direction perpendicular to the extension direction of the passage.

[0105] As described above, according to the adjustment device of this disclosure, the adjustment member includes alternately arranged sliding contacts and locking parts, with one locking part between every two adjacent sliding contacts. Therefore, the locking member can be locked to the locking parts within the range of motion of the two sliding contacts, thereby maintaining the backrest at a desired distance from the frame of the carrier to which the adjustment device is attached. Furthermore, the locking member can slide freely over the sliding contacts and lock into the locking parts, and at the same time, the locking parts and the locking member can engage with each other through their respective inclined surfaces. Thus, when attempting to tilt the backrest backward, the user does not need to press the release member, and after releasing the lock, a downward pressure is applied to the backrest. After the locking member passes the locking part, there is no need to apply force to the release member, the locking member slides freely over the sliding contacts until it contacts the next locking part, and is locked by the next locking part. In this way, the user can perform the backrest tilt adjustment process with less effort. When attempting to move the backrest upward, the user can do so simply by pulling the adjustment member at the operating end (without needing to press the release member). In short, the locking member forms a one-way lock relative to the adjustment member. Thus, the child's back is always supported by the backrest as it moves upward, and the lock must be specially released to move the backrest downward, thus avoiding the risk of the child losing support and potentially getting injured due to the backrest suddenly moving downward.

[0106] Accordingly, carriers equipped with the adjustment device of this disclosure have the same technical effect, and therefore, a detailed explanation is omitted here.

[0107] It should be understood that the above description is merely an exemplary embodiment of the Disclosure and does not limit the scope of protection of the Disclosure, and therefore any equivalent modifications made pursuant to the claims of the Disclosure fall within the scope of the Disclosure.

Claims

1. A locking member having a locked position and an unlocked position, The adjustment member includes a fixed end, an operating end, and at least two sliding contact portions and at least one locking portion located between the fixed end and the operating end, wherein the sliding contact portions and the locking portions are arranged alternately. The sliding contact portion and the locking member are slidably engaged, thereby allowing the locking member to slide against the adjusting member at the sliding contact portion. When the locking member is in the locked position, the locking portion prevents the locking member from sliding toward the operating end of the locking portion toward the operating end, An adjustment device wherein, when the locking member is in the unlocked position, the locking member can slide relative to the adjustment member from one side away from the operating end of the locking portion toward the operating end.

2. The housing further includes a passage formed in the housing through which the adjustment member passes, and the locking member moves relative to the housing between the unlocked position and the locked position. A gap is formed between the locking member and the housing for the adjustment member to pass through. When the locking member is in the locked position, in a direction perpendicular to the extending direction of the passage, the minimum width of the gap is smaller than the maximum width of the locking portion located in the passage, and larger than the maximum width of the sliding contact portion located in the passage. The adjustment device according to claim 1, wherein when the locking member is in the unlocked position, the minimum width of the gap in a direction perpendicular to the extending direction of the passage is greater than or equal to the maximum width of the locking portion located in the passage, and greater than the maximum width of the sliding contact portion located in the passage.

3. The adjustment device according to claim 1, wherein the circumferential outer surface of the locking portion protrudes outward from the circumferential outer surface of the sliding contact portion.

4. The housing is provided with a guide hole through which the adjustment member passes, and the locking member is provided with a locking hole through which the adjustment member passes. The adjustment device according to claim 2, wherein the gap is the portion in which the lock hole and the guide hole overlap in the extending direction of the passage.

5. When the locking member is in the locked position, the minimum width of the gap is jointly limited by the hole wall adjacent to the sliding contact portion of the locking hole and the hole wall of the guide hole. The adjustment device according to claim 4, wherein the hole wall of the lock hole and the hole wall of the guide hole are located on opposite sides of the sliding contact portion in a direction perpendicular to the extending direction of the passage.

6. Each of the aforementioned locking parts has a sliding surface and a locking surface. The sliding surface is close to the operating end, the locking surface is close to the fixed end, and the sliding surface is inclined with respect to the direction of movement of the locking member between the locked position and the unlocked position. The adjustment device according to any one of claims 1 to 5, wherein when the locking member is in the locked position, the locking surface prevents the locking member from sliding relative to the adjustment member from one side away from the operating end of the locking portion toward the operating end, and the sliding surface allows the locking member to slide relative to the adjustment member from one side close to the operating end of the locking portion toward the fixed end, thereby moving from the locked position to the unlocked position.

7. A lock release member configured to drive the lock member and move it from the locked position to the unlocked position, The adjustment device according to any one of claims 1 to 5, further comprising a return member that constantly applies a force to the locking member to return the locking member to the locked position.

8. The locking member is provided with a first inclined surface that is inclined with respect to the direction of movement of the locking member between the locked position and the unlocked position. The adjustment device according to claim 7, wherein the unlocking member has a second inclined surface that is inclined with respect to the direction of movement of the unlocking member, and the first inclined surface and the second inclined surface can contact each other and slide relative to each other, thereby converting the direction of movement of the unlocking member to the direction of movement of the locking member between the locked position and the unlocked position.

9. The adjustment device according to any one of claims 1 to 5, wherein the adjustment member is a pull cord, the sliding contact portion is the body of the pull cord, and the locking portion is formed by a knot in the pull cord.

10. A carrier to which the adjustment device described in any one of claims 1 to 5 is attached, the carrier is The seat and, A backrest pivotably connected to the aforementioned seat, A frame, which, when the carrier is in an unfolded state, includes a frame to which the seat portion is fixed. A carrier in which the fixed end is connected to the frame and the locking member is connected to the backrest.

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