Infant carrier and height adjustment mechanism

Abstract

To provide a height adjustment mechanism capable of preventing accidental unlocking and an infant carrier equipped with the same. The height adjustment mechanism includes a positioning member (31), an elastic member (32), a release operation member (33), and a fixed seat (34) for assembling and connecting with the carrier body (20). The fixed seat is slidably disposed on the carrier frame (10) and is slidably adjustable relative to the carrier frame. The carrier frame includes at least two positioning portions (11). The positioning member (31) is movably assembled on the fixed seat and is selectively engageable with either of the positioning portions. The release operation member is movably attached to the fixed seat and interlocks with the positioning member via the elastic member. The force of the release operation member for causing elastic deformation in the elastic member in the disengagement process is smaller than the resistance force generated by both the fixed seat and the carrier body at the fixed seat for preventing the disengagement movement of the positioning member.

Description

Technical Field

[0001] The present disclosure relates to a baby carrier and a height adjustment mechanism.

Background Art

[0002] For a long time, strollers have been widely used in families with children. This type of stroller usually comprises a frame and a carrycot or a seat selectively arranged on the frame. To facilitate the use of strollers, some strollers are provided with a seat height adjustment mechanism between the frame and the seat. A conventional height adjustment mechanism comprises an operating mechanism and an engaging mechanism. By operating the operating mechanism, the unlocking of the engaging mechanism can be controlled, and the height of the seat relative to the frame can be adjusted.

Summary of the Invention

Problem to be Solved by the Invention

[0003] However, in the conventional seat height adjustment mechanism, the seat is adjusted immediately after the operating mechanism is operated, so the height adjustment of the seat is too accidental, and as a result, the seat may slip off the frame due to accidental contact or misoperation.

Means for Solving the Problem

[0004] A height adjustment mechanism is provided by the present disclosure, which is positioned on an infant carrier, the infant carrier comprising a carrier frame and a carrier body, the height adjustment mechanism comprising a positioning member, an elastic member, a release operating member, and a fixed seat for assembling and connecting to the carrier body, the fixed seat being slidably positioned on the carrier frame and slidably adjustable relative to the carrier frame, the carrier frame comprising at least two positioning parts, the positioning member being movably assembled to the fixed seat and selectively engageable with either of the positioning parts, the release operating member being movably mounted to the fixed seat and the release operating member being interlocked with the positioning member via an elastic member, and in the disengagement process, the force of the release operating member to cause elastic deformation of the elastic member is less than the resistance force generated by both the fixed seat and the carrier body on the fixed seat to prevent the disengagement movement of the positioning member.

[0005] In one embodiment, the release operating member is hinged to the fixed seat so as to be extendable and retractable, and in response to operation of the release operating member, the release operating member rotates and retracts into the fixed seat, thereby disengaging.

[0006] In one embodiment, the height adjustment mechanism according to the present disclosure further includes a sliding member slidably disposed within a fixed seat, wherein the sliding member and the elastic member are connected in a contact manner, and a release operating member pushes the sliding member upward in a disengagement process, and the upward sliding sliding member pushes the elastic member such that the elastic member is elastically deformed.

[0007] In one embodiment, the release operating member is provided with an outwardly protruding push projection, a positioning notch is formed between the push projection and the release operating member, the sliding member is positioned within the positioning notch and connected to the release operating member in a contact manner, and in response to the operation of the release operating member, the release operating member rotates and retracts into the fixed seat, thereby causing the push projection to push the sliding member and slide it upward.

[0008] In one embodiment, the sliding member has a bottom portion, on which a pressing inclined surface is positioned obliquely with respect to the sliding direction of the sliding member, and the pressing projection contacts the pressing inclined surface of the sliding member.

[0009] In one embodiment, the height adjustment mechanism according to the present disclosure further includes a connecting member, a positioning member attached to the first end of the connecting member, a sliding member slidably disposed at the second end of the connecting member, and an elastic member disposed between the sliding member and the connecting member.

[0010] In one embodiment, the sliding member has a mounting chamber, the second end of the connecting member is movably positioned within the mounting chamber, and the elastic member is positioned within the mounting chamber.

[0011] In one embodiment, a blocking projection is provided at the second end of the connecting member, the first end of the elastic member abuts against the blocking projection, and the second end of the elastic member abuts against the bottom wall of the mounting chamber in the sliding member.

[0012] In one embodiment, the positioning member includes an engaging portion and a rotating portion, the rotating portion having a first end rotatably connected to the first end of the connecting member, the engaging portion having a first end attached to the second end of the rotating portion and rotatably connected to a fixed seat, and the rotating portion being rotatably and swingably arranged on the connecting member.

[0013] In one embodiment, the positioning member further includes a pivot shaft, the pivot shaft having a first end rotatably assembled to a fixed seat and a second end attached to the second end of the rotating part, the first end of the engaging part being attached to the portion between the two ends of the pivot shaft.

[0014] In one embodiment, the engaging portion is a block-shaped member whose width gradually increases from its first end to its second end, and the bottom surface of the second end of the engaging portion is provided with an inclined surface for insertion and engagement.

[0015] In one embodiment, the height adjustment mechanism according to the present disclosure further includes an engagement restoring member disposed between a fixed seat and a connecting member, the engagement restoring member always having a tendency to slide the connecting member downward.

[0016] In one embodiment, the connecting member is a rod-shaped member, and the sliding direction of the sliding member is the same as the sliding direction of the connecting member.

[0017] In one embodiment, a sliding rail is attached to the carrier frame, a fixed seat is assembled to slide on the sliding rail, and all positioning parts are spaced apart on the sliding rail.

[0018] In one embodiment, the positioning section has a slot structure.

[0019] In one embodiment, the upper wall of the positioning portion is a sliding inclined surface that is inclined inward from the top to the bottom.

[0020] In one embodiment, the fixed seat includes a long handle portion and a retaining seat portion attached to the lower end of the long handle portion, and the release operating member is positioned at the upper end of the long handle portion, and a sleeve ring is attached to the upper end of the long handle portion, and the sleeve ring is slidably sleeve-connected to the carrier frame.

[0021] To achieve the above objectives, the infant carrier according to this disclosure includes a carrier frame, a carrier body, and a height adjustment mechanism as described above, and the fixed seat is assembled to the carrier body.

[0022] In one embodiment, the carrier frame is a pushcart frame or a baby high chair frame.

[0023] In one embodiment, the carrier body is a baby sleeping box, a child seat, or a baby high chair. [Brief explanation of the drawing]

[0024] [Figure 1] Figure 1 is a schematic diagram of the three-dimensional structure of an infant carrier according to the present disclosure. [Figure 2] Figure 2 is a schematic diagram of the three-dimensional structure of a carrier frame in an infant carrier according to the present disclosure. [Figure 3] Figure 3 is a schematic diagram of the three-dimensional structure of the height adjustment mechanism in the carrier frame shown in Figure 2 viewed from another angle, with the fixing seat removed. [Figure 4] Figure 4 is a schematic diagram of the three-dimensional structure of the carrier frame shown in Figure 3, with a part of the structure removed. [Figure 5] Figure 5 is a schematic diagram of the three-dimensional structure of the height adjustment mechanism in the carrier frame shown in Figure 4 and an enlarged schematic diagram of a partial structure thereof, with the fixing seat removed. [Figure 6] Figure 6 is a schematic diagram of the three-dimensional structure after the release operating member of the height adjustment mechanism in the carrier frame shown in Figure 5 is pressed down and an enlarged schematic diagram of a partial structure thereof. [Figure 7] Figure 7 is a schematic diagram of the three-dimensional structure of the carrier frame shown in Figure 5 and the height adjustment mechanism thereon viewed from another angle, and an enlarged schematic diagram of a partial structure. [Figure 8] Figure 8 is a schematic diagram of the three-dimensional structure of the carrier frame shown in Figure 6 and the height adjustment mechanism thereon viewed from another angle, and an enlarged schematic diagram of a partial structure. [Figure 9] Figure 9 is a schematic diagram of the three-dimensional structure of a positioning member in a height adjustment mechanism according to the present disclosure. [Figure 10] Figure 10 is a schematic plan view showing that the positioning member is released from the positioning portion when the release operating member is pressed to adjust the carrier body upward in the height adjustment mechanism according to the present disclosure. [Figure 11] Figure 11 is a schematic plan view after the positioning member is released from the positioning portion when the release operating member is pressed to adjust the carrier body upward in the height adjustment mechanism according to the present disclosure. [Figure 12]Figure 12 is a schematic diagram of the three-dimensional structure of the height adjustment mechanism according to this disclosure, viewed from a different angle. [Figure 13] Figure 13 is a schematic diagram of the three-dimensional structure of the height adjustment mechanism shown in Figure 12, and an enlarged schematic diagram of its substructure, with the substructure of the fixed base removed. [Modes for carrying out the invention]

[0025] To further illustrate the technical content and structural features of this disclosure, embodiments and accompanying drawings will be provided below.

[0026] As shown in Figures 1 and 2, the infant carrier 100 according to this disclosure includes a carrier frame 10, a carrier body 20, and a height adjustment mechanism 30. As described below, in the height adjustment mechanism 30, a fixed seat 34 is assembled to the carrier body 20, and the fixed seat 34 is slidably positioned on the carrier frame 10 and is slidably adjustable relative to the carrier frame 10. In the disengagement process, when adjusting the height of the carrier body 20, it is necessary to lift the carrier body 20 to adjust the height in order to avoid accidental operation of the height adjustment of the carrier body 20. Thus, the infant carrier 100 according to this disclosure can prevent accidental disengagement of the carrier body 20 from the carrier frame 10 due to accidental contact, and thus effectively ensures safe use. For example, the carrier body 20 is mainly a device for carrying infants such as a baby sleeping box, child seat, or baby high chair, but is not limited to these. The carrier frame 10 can be broadly divided into two types: one type is a carrier frame 10 such as a pushcart frame that can provide a mobility function, and the other type is a carrier frame 10 such as a baby high chair frame that can provide a fixing and support function, but is not limited to these. In short, those skilled in the art can connect the carrier body 20 to an existing carrier frame 10 according to their actual needs without any creative work to achieve combined use according to their actual needs, and therefore, the details will not be repeated here. The height adjustment mechanism 30 according to this disclosure will be described in more detail below with reference to Figures 2 to 13.

[0027] As shown in Figures 2 to 8 and Figures 12 and 13, the height adjustment mechanism 30 may include a positioning member 31, an elastic member 32, a release operation member 33, a fixed seat 34, a sliding member 35 slidably disposed on the fixed seat 34, and a connecting member 36. The fixed seat 34 may be slidably disposed on the carrier frame 10 and may be slidably adjustable relative to the carrier frame 10. The carrier frame 10 may have at least two positioning parts 11. The positioning member 31 may be movably assembled on the fixed seat 34 and may selectively engage with any of the positioning parts 11. The release operation member 33 may be movably assembled on the fixed seat 34 and may be interlocked with the positioning member 31 via the elastic member 32. In the disengagement process, the force of the release operation member 33 to cause elastic deformation of the elastic member 32 is less than the resistance force generated by both the fixed seat 34 and the carrier body 20 on the fixed seat 34 to prevent the disengagement movement of the positioning member 31. Thus, even when the release operation member 33 is operated, the carrier body 20 is not adjusted upward, so there is no lifting force that balances the resistance force generated by both the fixed seat 34 and the carrier body 20 to prevent the disengagement movement of the positioning member 31. Therefore, the elastic force generated by the elastic member 32 due to the operation of the release operation member 33 is not sufficient to slide the connecting member 36 upward, and the positioning member 31 attached to the connecting member 36 cannot move, and therefore the engaging portion 311 on the positioning member 31 remains engaged with one of the positioning portions 11 at all times, and the carrier body 20 may remain locked on the carrier frame 10, and as a result the height of the carrier body 20 cannot be adjusted, thereby effectively avoiding accidental disengagement due to accidental contact during the height adjustment process of the carrier body 20, which would otherwise require lifting the carrier body 20 to release the lock of the height adjustment mechanism 30. For example, the elastic member 32 is a compression spring. Depending on the actual requirements, the elastic member 32 may be a pair of magnetic members with opposite polarities, with the positive electrode member attached to the connecting member 36 and the negative electrode member attached to the sliding member 35, but is not limited to this.Specifically, the sliding member 35 and the elastic member 32 may be connected by contact. In the disengagement process, the disengagement operation member 33 pushes the sliding member 35 to slide it upward, and the sliding member 35, sliding upward, pushes the elastic member 32 to deform it elastically, facilitating the elastic deformation of the elastic member 32. More specifically, the positioning member 31 may be attached to the first end of the connecting member 36, and the sliding member 35 may be slidably positioned at the second end of the connecting member 36. The elastic member 32 may be positioned between the sliding member 35 and the connecting member 36. The arrangement of the connecting member 36 simplifies the interlocking structure between the disengagement operation member 33 and the positioning member 31. To facilitate the positioning member 31 returning to its original position and engaging with the positioning portion 11 on the carrier frame 10, the height adjustment mechanism 30 may further include an engagement restoring member 37 positioned between the fixed seat 34 and the connecting member 36, the engagement restoring member 37 may always have a tendency to slide the connecting member 36 downward.

[0028] As shown in Figures 4 to 8, the release operating member 33 may be hinged to the fixed seat 34 so as to be extendable and retractable. When pressed, it rotates and retracts into the fixed seat 34, releasing the engagement, making the operation of the release operating member 33 simple and convenient. Specifically, the release operating member 33 may be provided with an outwardly protruding push projection 331, and a positioning notch 332 may be formed between the push projection 331 and the release operating member 33. The sliding member 35 may be positioned within the positioning notch 332 and connected to the release operating member 33 in a contact manner. When pressed, the release operating member 33 may rotate and retract into the fixed seat 34, and the push projection 331 may press the sliding member 35 and slide it upward. Thus, the interlocking structure between the release operating member 33 and the sliding member 35 is simple and easy to implement, which is advantageous in reducing manufacturing difficulty and manufacturing costs. More specifically, a pressing inclined surface 351 is positioned at the bottom of the sliding member 35 at an angle to the sliding direction of the sliding member 35. The pushing projection 331 may be pressed against the pressing inclined surface 351 of the sliding member 35. By providing the pressing inclined surface 351 on the sliding member 35, the release operation member 33 can be easily pressed to slide the sliding member 35.

[0029] As shown in Figures 5 to 8, the sliding member 35 may have a mounting chamber 352. The second end of the connecting member 36 is movably positioned within the mounting chamber 352. The elastic member 32 is positioned within the mounting chamber 352. The cooperation between the mounting chamber 352 and the connecting member 36 allows the sliding member 35 to slide smoothly and stably on the connecting member 36, which is advantageous for concealing the elastic member 32 and further simplifies the structure. Specifically, the second end of the connecting member 36 is provided with a blocking projection 361, the first end of the elastic member 32 abuts against the blocking projection 361, and the second end of the elastic member 32 abuts against the bottom wall of the mounting chamber 352 in the sliding member 35, thereby allowing the elastic member 32 to be stably attached to the mounting chamber 352.

[0030] As shown in Figures 5 to 9, the positioning member 31 may include an engaging portion 311 and a rotating portion 312. The rotating portion 312 may have a first end that is rotatably connected to the first end of the connecting member 36. The engaging portion 311 may have a first end that is attached to the second end of the rotating portion 312 and rotatably connected to the fixed seat 34. The rotating portion 312 may be rotatably and swingably arranged on the connecting member 36, and the arrangement of the rotating portion 312 allows the positioning member 31 to be simultaneously displaced and rotated, thereby facilitating the effective and stable engagement and disengagement of the positioning member 31 with the positioning portion 11 on the carrier frame 10. In one embodiment, a rotation shaft 3121 perpendicular to the rotating portion 312 is provided at the first end of the rotating portion 312. The rotating portion 312 is rotatably connected to the first end of the connecting member 36 via the rotation shaft 3121 to facilitate the rotation of the rotating portion 312. Specifically, the positioning member 31 may further include a pivot shaft 313. The first end of the pivot shaft 313 is rotatably assembled to a fixed seat 34, and the second end of the rotating part 312 is attached to the second end of the pivot shaft 313. The first end of the engaging part 311 may be attached to a position between the two ends of the pivot shaft 313. The pivot shaft 313 provides a pivot point for rotating the positioning member 31 and facilitates the rotation of the positioning member 31. More specifically, the engaging part 311 may be a block-shaped member whose width gradually increases from the first end to the second end. The bottom surface of the second end of the engaging part 311 may be provided with an insertion and engagement inclined surface 314. The second end of the engaging part 311 may have a larger width and be less susceptible to crushing. The insertion and engagement inclined surface 314 facilitates the engagement of the engaging part 311 to or from the positioning part 11. In one embodiment, the connecting member 36 may be a rod-shaped member, and the sliding direction of the sliding member 35 may be the same as the sliding direction of the connecting member 36. Therefore, the connecting member 36 has a simple structure and is easy to arrange and manufacture. By having the sliding member 35 and the connecting member 36 slide in the same direction, the structure of the height adjustment mechanism 30 can be greatly simplified and made more compact.In one embodiment, because the rotation direction of the release operation member 33 is different from the rotation direction of the positioning member 31, the connecting member 36 oscillates slightly during the sliding process.

[0031] As shown in Figures 2 to 8, a sliding rail 12 may be attached to the carrier frame 10. The fixed seat 34 may be assembled to slide on the sliding rail 12. All positioning parts 11 may be spaced apart on the sliding rail 12. In this way, the fixed seat 34 can slide quickly and stably on the carrier frame 10 along the sliding rail 12, facilitating quick height adjustment of the carrier body 20 on the carrier frame 10. For example, the positioning part 11 may, but is not limited to, a slot structure such as a counterbore structure to facilitate engagement between the positioning member 31 and the positioning part 11. Specifically, the upper wall of the positioning part 11 is a sliding inclined surface 111 that is inclined inward from the top to the bottom. When the carrier body 20 is adjusted upward, the positioning member 31 is driven to move upward, and then the engaging part 311 is quickly pushed out from the positioning member 31 by the sliding inclined surface 111, facilitating quick disengagement. More specifically, as shown in Figure 12, the fixed seat 34 may include a long handle portion 341 and a retaining seat portion 342 attached to the lower end of the long handle portion 341, and a through hole 341a through which the engaging portion 311 passes is formed at the lower end positions of the long handle portion 341 and the retaining seat portion 342 corresponding to the engaging portion 311. The release operation member 33 is positioned at the upper end of the long handle portion 341. A sleeve ring 343 is attached to the upper end of the long handle portion 341. The sleeve ring 343 is slidably sleeve-connected to the carrier frame 10. The sleeve ring 343 prevents displacement of the fixed seat 34, thereby allowing the fixed seat 34 to slide stably on the carrier frame 10. The carrier body 20 can be assembled to the carrier frame 10 by the retaining seat portion 342, and the carrier body 20 and the carrier frame 10 can be easily removed. For example, the retaining seat portion 342 has an engagement chamber, which facilitates engaging the carrier body 20 with the engagement chamber. The release operating member 33 is positioned at the upper end of the long handle portion 341 to facilitate user operation.

[0032] The operating principle of the infant carrier 100 according to this disclosure will be explained with reference to Figures 1 to 13. When in use, the carrier body 20 is engaged with the retaining seat portion 342 of the fixed seat 34. When it is necessary to adjust the height of the carrier body 20, the release operating member 33 can be pressed, rotated, and retracted into the fixed seat 34. The push projection 331 of the release operation member 33 presses the sliding member 35 and causes it to slide upward. The sliding member 35, sliding upward, continuously compresses the elastic member 32 upward. However, at this time, the blocking projection 361 at the second end of the connecting member 36 does not slide upward under the action of the elastic member 32. In other words, the connecting member 36 does not slide upward. The reason for this is that the weight of the fixed seat 34 and the carrier body 20 keeps the engaging portion 311 of the positioning member 31 attached to the first end of the connecting member 36 constantly engaged with the positioning portion 11, and the insertion of the engaging portion 311 of the positioning member 31 and the inclined surface 314 for engaging The elastic member 32 is always in contact with the bottom surface of the positioning part 11, while the elastic deformation force of the elastic member 32 is less than the resistance force generated by both the fixed seat 34 and the carrier body 20 to prevent the positioning member from disengaging. That is, the elastic force generated after the elastic member 32 is compressed is not sufficient to disengage the engaging part 311 of the positioning member 31 from the positioning part 11, and therefore the positioning member 31 cannot move, preventing the carrier body 20 from disengaging by accidental contact with the disengagement operating member 33. Subsequently, when the carrier body 20 is lifted upward, the weight of the fixed seat 34 and the carrier body 20 no longer acts on the engagement point between the engaging part 311 and the positioning part 11, thereby allowing the insertion and engaging inclined surface 314 of the engaging part 311 to disengage from contact with the positioning part 11. At this time, the compressed elastic member 32 returns to its original shape, pushing the blocking projection 361 and the connecting member 36 upward, causing the connecting member 36 to rotate and swing the rotating portion 312 of the positioning member 31, the rotating shaft 313 rotates around its own axis so as to rotate the engaging portion 311 of the positioning member 31, and the engaging portion 311 of the positioning member 31 is disengaged from the positioning portion 11. In this way, the fixed seat 34 can be slidably adjusted relative to the carrier frame 10, and the height of the carrier body 20 can be adjusted.In the process of adjusting the height of the carrier body 20, the height adjustment mechanism 30 cannot be unlocked by simply operating the release operating member 33. Therefore, it is necessary to lift the carrier body 20 to unlock the height adjustment mechanism 30, which effectively prevents accidental unlocking due to accidental contact with the release operating member 33. The relevant operating principle is as described above.

[0033] Compared to the prior art, the height adjustment mechanism 30 according to this disclosure may include a positioning member 31, an elastic member 32, a release operating member 33, a fixed seat 34, a sliding member 35 slidably disposed on the fixed seat 34, and a connecting member 36. The fixed seat 34 may be slidably disposed on the carrier frame 10 and may be slidably adjusted relative to the carrier frame 10. The carrier frame 10 may have at least two positioning parts 11. The positioning member 31 may be movably assembled to the fixed seat 34 and selectively engage with any of the positioning parts 11. The release operating member 33 is movably mounted on the fixed seat 34. The release operating member 33 may also be interlocked with the positioning member 31 via the elastic member 32. In the disengagement process, the force of the release operating member 33 to cause elastic deformation of the elastic member 32 is less than the resistance force generated by both the fixed seat 34 and the carrier body 20 on the fixed seat 34 to prevent the disengagement movement of the positioning member 31. Therefore, even when the release operation member 33 is operated, the carrier body 20 is not adjusted upward, resulting in insufficient force to lift the carrier body 20 to balance the resistance force generated by both the fixed seat 34 and the carrier body 20, which prevents the disengagement movement of the positioning member 31. Consequently, the elastic force generated by the elastic member 32 due to the operation of the release operation member 33 is not sufficient to slide the connecting member 36 upward, and the positioning member 31 attached to the connecting member 36 cannot move as expected. Therefore, the engaging portion 311 on the positioning member 31 remains engaged with one of the positioning portions 11 at all times, and the carrier body 20 remains locked on the carrier frame 10. As a result, the height of the carrier body 20 cannot be adjusted, and thus, in the process of adjusting the height of the carrier body 20, it is necessary to lift the carrier body 20 to release the lock of the height adjustment mechanism 30, effectively avoiding accidental disengagement due to accidental contact.

[0034] Furthermore, since the infant carrier 100 according to this disclosure includes a carrier frame 10, a carrier body 20, and a height adjustment mechanism 30, the infant carrier 100 according to this disclosure can prevent accidental unlocking of the carrier body 20 on the carrier frame 10 due to accidental contact.

[0035] The information disclosed above is merely a preferred example of the present disclosure and cannot be used to limit the scope of protection of the present disclosure. Accordingly, all equivalent modifications made in accordance with the claims of this application fall within the scope of the present disclosure.

Claims

1. A height adjustment mechanism for placement on an infant carrier, The infant carrier includes a carrier frame and a carrier body. The height adjustment mechanism is Connecting member, A positioning member attached to the connecting member, Elastic member and Release operation member and It includes a fixing base for assembling and connecting to the carrier body, The fixed seat is slidably positioned on the carrier frame and is slidably adjustable relative to the carrier frame. The carrier frame includes at least two positioning parts, the positioning member is movably assembled to the fixed seat and selectively engageable with either of the positioning parts, the release operating member is movably mounted to the fixed seat, the release operating member is interlocked with the positioning member via the elastic member, and the disengagement process involves the positioning member disengaging from the positioning parts, wherein in the disengagement process of lifting the carrier body to adjust its height, the elastic force causing elastic deformation of the elastic member has a tendency to disengage the positioning member from the positioning parts, and the fixed seat and The resistance force generated by both the carrier body and the fixed seat tends to prevent the disengagement movement of the positioning member, and because the elastic force is smaller than the resistance force when the carrier body is attached to the fixed seat, the elastic force generated by the elastic member due to the operation of the disengagement operation member when the carrier body is not lifted is not sufficient to slide the connecting member upward, and the positioning member attached to the connecting member cannot move, and as a result the elastic force generated by the elastic member prevents the positioning member from disengaging from the positioning part. Height adjustment mechanism.

2. The height adjustment mechanism according to claim 1, wherein the release operating member is movably assembled to the fixed seat, and when the carrier body is lifted, the release operating member rotates and retracts into the fixed seat, thereby disengaging the engagement.

3. The height adjustment mechanism according to claim 1 or 2, further comprising a sliding member slidably disposed within the fixed seat, wherein the sliding member and the elastic member are connected in a contact manner, and the release operating member pushes the sliding member upward in the release process, and the sliding member sliding upward pushes the elastic member such that the elastic member is elastically deformed.

4. The height adjustment mechanism according to claim 3, wherein the release operating member is provided with a push projection that protrudes outward, and when the carrier body is lifted, the release operating member rotates and retracts into the fixed seat, thereby the push projection pushes the sliding member and slides it upward.

5. The height adjustment mechanism according to claim 4, wherein the sliding member has a bottom, and a pressing inclined surface is arranged at an angle to the sliding direction of the sliding member on the bottom, and the pressing projection contacts the pressing inclined surface of the sliding member.

6. The height adjustment mechanism according to any one of claims 3 to 5, wherein the positioning member is attached to the first end of the connecting member, the sliding member is slidably disposed at the second end of the connecting member, and the elastic member is disposed between the sliding member and the connecting member.

7. The height adjustment mechanism according to claim 6, wherein the sliding member has a mounting chamber, the second end of the connecting member is movably disposed within the mounting chamber, and the elastic member is disposed within the mounting chamber.

8. The height adjustment mechanism according to claim 7, wherein a blocking projection is provided at the second end of the connecting member, the first end of the elastic member abuts against the blocking projection, and the second end of the elastic member abuts against the bottom wall of the mounting chamber in the sliding member.

9. The height adjustment mechanism according to any one of claims 6 to 8, wherein the positioning member includes an engaging portion and a rotating portion, the rotating portion has a first end that is rotatably connected to the first end of the connecting member, the engaging portion has a first end that is attached to the second end of the rotating portion and rotatably connected to the fixed seat, and the rotating portion is rotatably and swingably arranged on the connecting member.

10. The height adjustment mechanism according to claim 9, wherein the positioning member further includes a pivot shaft, the pivot shaft having a first end rotatably assembled to the fixed seat and a second end attached to the second end of the rotating part, and the first end of the engaging part is attached between the first end and the second end of the pivot shaft.

11. The height adjustment mechanism according to claim 9 or 10, wherein the engaging portion is a block-shaped member whose width gradually increases from its first end to its second end, and the bottom surface of the second end of the engaging portion is provided with an inclined surface for insertion and engagement.

12. The height adjustment mechanism according to any one of claims 6 to 11, further comprising an engagement restoring member disposed between the fixed seat and the connecting member, wherein the engagement restoring member always tends to slide the connecting member downward.

13. The height adjustment mechanism according to any one of claims 6 to 12, wherein the connecting member is a rod-shaped member, and the sliding direction of the sliding member is the same as the sliding direction of the connecting member.

14. A height adjustment mechanism according to any one of claims 1 to 13, wherein a sliding rail is attached to the carrier frame, the fixed seat is assembled to be slidable on the sliding rail, and all the positioning parts are arranged at intervals on the sliding rail.

15. The height adjustment mechanism according to any one of claims 1 to 14, wherein the positioning portion has a slot structure.

16. The height adjustment mechanism according to claim 15, wherein the upper wall of the positioning portion is a sliding inclined surface arranged to be inclined inward from the top to the bottom.

17. The height adjustment mechanism according to any one of claims 1 to 16, wherein the fixed seat includes a long handle portion and a retaining seat portion attached to the lower end of the long handle portion, the release operating member is positioned at the upper end of the long handle portion, a sleeve ring is attached to the upper end of the long handle portion, and the sleeve ring is slidably sleeve-connected to the carrier frame.

18. An infant carrier comprising a carrier frame and a carrier body, wherein the infant carrier further comprises a height adjustment mechanism according to any one of claims 1 to 17, and the fixed seat is assembled to the carrier body.

19. The infant carrier according to claim 18, wherein the carrier frame is a pushcart frame or a baby high chair frame.

20. The infant carrier according to claim 18 or 19, wherein the carrier body is a baby sleeping box, a child seat, or a baby high chair.

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