Connection structure and child carrier

Abstract

The present application relates to a connection structure (200) and a child carrier (1000). The connection structure is configured to connect the child carrier to a car seat (2000). The child carrier is provided with a plurality of engaging members (101, 102). The connection structure includes: a base assembly (20); a first connection mechanism (40) configured to be detachably connected to the car seat; and a second connection mechanism (50) configured to be detachably connected to one of the plurality of engaging members. The first connection mechanism and the second connection mechanism are connected to the base assembly. A shape of the second connection mechanism is configured to be adapted for connecting part of the plurality of engaging members. The first connection mechanism is movably connected to the base assembly and has an unfolded state and a folded state.

Description

CONNECTION STRUCTURE AND CHILD CARRIER CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese patent application No. 2023116639917, filed on December 5, 2023, Chinese patent application No. 2023112818960, filed on September 28, 2023, and Chinese patent application No. 2024112565247, filed on September 6, 2024, the contents of which are hereby incorporated by reference in their entireties.TECHNICAL FIELD

[0002] The present application relates to the technical field of child products, and in particular to a connection structure and a child carrier.BACKGROUND

[0003] A car child safety seat, also referred to as a child restraint system (CRS), is a seat that is specially designed for children of different ages (or weights) and mounted in cars and can effectively improve safety of the child in the car. Generally, depending on ages or body sizes of children, there is a need to choose an appropriate safety seat style. For infants aged zero to one year old (within about ten kilograms), it is generally suitable to choose a bed-type safety seat, that is, an infant safety carrier, so that little infants can be ideally protected in suitable special seats.

[0004] Currently, a common infant safety carrier generally includes a carrying part and a base assembly. The base assembly is formed at the bottom of the carrying part. When an infant needs to be seated in a car, the infant safety carrier is directly placed on a car seat and is connected to the car seat through the base assembly. However, due to structural limitations, the above infant safety carrier is heavy and not lightweight enough. When a user carries the infant safety carrier while walking, it is easy to make the user tired and increase a burden of walking.SUMMARY

[0005] According to various embodiments of the present application, a connection structure and a child carrier are provided. The inventions are set out in the appended sets of claims. The dependent claims describe optional embodiments of the invention.

[0006] According to an aspect of the present application, a connection structure, configured to connect a child carrier to a car seat, is provided. The child carrier is provided with a plurality of engaging members. The connection structure includes: a base assembly; a first connection mechanism configured to be detachably connected to the car seat; and a second connection mechanism configured to be detachably connected to one of the plurality of engaging members. The first connection mechanism and the second connection mechanism are connected to the base assembly. A shape of the second connection mechanism is configured to be adapted for connecting part of the plurality of engaging members. The first connection mechanism is movably connected to the base assembly and has an unfolded state and a folded state.

[0007] According to another aspect of the present application, a connection structure is provided. The connection structure is configured to connect a child carrier to a car seat. The child carrier is provided with a plurality of engaging members. The connection structure includes: a base assembly, a first connection mechanism, and a second connection mechanism. The first connection mechanism is configured to be detachably connected to the car seat. The second connection mechanism is configured to be detachably connected to one of the plurality of engaging members. The first connection mechanism and the second connection mechanism are connected to the base assembly. A shape of the second connection mechanism is configured to be adapted for connecting the one of the plurality of engaging members.

[0008] In an embodiment, the base assembly includes a first base and a second base capable of telescopically sliding back and forth relative to the first base. The first connection mechanism is connected to the first base, and the second connection mechanism is connected to the second base.

[0009] In an embodiment, the first traction component is a flexible element, and the first traction component includes a first traction rope and a first traction sleeve sleeved outside the first traction rope. When the first operating member is operated, the first traction sleeve is bent and deformed so that the first traction rope pulls the linkage component to drive the driving member to move in a direction approaching the first base.

[0010] In an embodiment, the first traction component includes: a first traction rope and a first traction sleeve movably sleeved outside the first traction rope. The first traction sleeve has a first sleeve end and a second sleeve end. The first traction rope has a first rope end adjacentto the first sleeve end and a second rope end adjacent to the second sleeve end. The first rope end of the first traction rope is connected to the second base, and the second rope end of the first traction rope is connected to the linkage component. The first sleeve end of the first traction sleeve is connected to the first operating member, and the second sleeve end of the first traction sleeve is connected to the first base. When the first operating member is operated, the first traction sleeve is bent and deformed so that the first traction rope pulls the linkage component to drive the driving member to move from the first position to the second position. The first traction sleeve is a bendable wire sleeve.

[0011] In an embodiment, the first unlocking mechanism further includes a first reset member. The first reset member abuts against the linkage component and is configured to drive the linkage component to be reset, so as to hold the driving member in the first position. The base assembly further includes a second reset member. The second reset member abuts against and is between the fixed frame and the first locking member, and is configured to drive the first locking member to be reset to hold the first locking member in the locked position.

[0012] In an embodiment, the first operating member is movably arranged on the second base. A moving direction of the first operating member is the same as or opposite to a moving direction of the driving member.

[0013] In an embodiment, the sliding frame is provided with a first limiting slot. The first limiting slot extends in a sliding direction of the sliding frame. A first connecting member configured to be connected to the fixed frame is slidably provided in the first limiting slot. The first locking member is pivotally connected to the fixed frame through the first connecting member. The fixed frame is provided with a second limiting slot. The second limiting slot extends in the sliding direction of the sliding frame. A second connecting member configured to be connected to the sliding frame is slidably provided in the second limiting slot.

[0014] In an embodiment, the first connection mechanism is movably connected to the base assembly and has an unfolded state and a folded state. A projection length of the connection structure on a horizontal plane when the first connection mechanism is in the unfolded state is greater than a projection length of the connection structure on the horizontal plane when the first connection mechanism is in the folded state.

[0015] In an embodiment, the first connection mechanism is movably connected to the baseassembly and has an unfolded state and a folded state. When the first connection mechanism is in the folded state, the first connection mechanism overlaps with the base assembly in a first direction; and when the first connection mechanism is in the unfolded state, the first connection mechanism protrudes from the base assembly in the first direction.

[0016] In an embodiment, one of the limiting element and the second locking member is a limiting slot, another of the limiting element and the second locking member is a limiting protrusion. When the limiting element is a limiting slot, the second locking member is a limiting protrusion. When the limiting element is a limiting protrusion, the second locking member is a limiting slot. The limiting protrusion has a third position extending into the limiting slot and a fourth position retracting from the limiting slot. An edge of at least one of the limiting element and the second locking member is provided with a guide slope adapted to release the locking.

[0017] In an embodiment, two driving wheels mesh with each other. The base assembly further includes an eighth reset member. The two second locking members are spaced apart. The eighth reset member abuts against and is between the two second locking members to provide an elastic restoring force for the two second locking members, to hold the two second locking members in the third position.

[0018] In an embodiment, the base assembly includes a locking retention mechanism. The locking retention mechanism is movably arranged in the accommodating cavity. When the engaging hook is driven to the locked position, the locking retention mechanism is configured to lock the engaging hook in the locked position.

[0019] In an embodiment, the locking retention mechanism includes a limiting member. The limiting member is movably arranged in the accommodating cavity and has a fifth position and a sixth position. One of the limiting member and the engaging hook is provided with a locking concave, and another of the limiting member and the engaging hook is provided with a first fitting portion. When the limiting member is in the fifth position, the locking concave is in concave-convex fit with the first fitting portion to lock the engaging hook in the locked position; and when the limiting member is in the sixth position, the locking concave is separated from the first fitting portion and the engaging hook is in the unlocked position. The locking retention mechanism further includes a fifth reset member. The fifth reset member provides anelastic restoring force for the limiting member to drive the limiting member to switch to the fifth position.

[0020] In an embodiment, the locking concave is arranged at the engaging hook. A pushing bump is provided in the accommodating groove. The pushing bump is arranged on the pushing wall surface and located on a movement path of the engaging member on the pushing wall surface.

[0021] In an embodiment, the first fitting portion is arranged at the limiting member. A width of the locking concave is greater than a thickness of the first fitting portion.

[0022] In an embodiment, the base assembly further includes a second unlocking mechanism. The second unlocking mechanism is operably connected to the limiting member and configured to drive the limiting member to move from the fifth position to the sixth position.

[0023] In an embodiment, the second unlocking mechanism includes a second operating member, a second traction component, and a fourth reset member. The second operating member is slidably arranged on the base assembly and has a seventh position and an eighth position. When the second operating member is in the seventh position, the limiting member is in the fifth position; and when the second operating member is in the eighth position, the limiting member is in the sixth position. The second traction component is connected between the second operating member and the limiting member. The second traction component includes a second traction rope and a second traction sleeve movably sleeved outside the second traction rope. The second traction sleeve has a first sleeve end and a second sleeve end. The second traction rope has a first rope end adjacent to the first sleeve end and a second rope end adjacent to the second sleeve end. The first rope end of the second traction rope is connected to the limiting member, and the second rope end of the second traction rope being connected to the base assembly. The first sleeve end of the second traction sleeve is connected to the base assembly, and the second sleeve end of the second traction sleeve is connected to the second operating member. When the second operating member switches from the seventh position to the eighth position, the second traction sleeve is deformed to cause the second traction rope to pull the limiting member to switch from the fifth position to the sixth position. The fourth reset member provides an elastic restoring force for the second operating member to hold the second operating member in the seventh position.

[0024] In an embodiment, the base assembly has an unlock indication region. The unlock indication region indicates, according to a relative position between the second operating member and the base assembly, that the first locking member is in the locked position or in the unlocked position.

[0025] In an embodiment, the second connection mechanism includes two engaging hooks. The two engaging hooks are spaced apart in an extending direction of the limiting groove. The locking retention mechanism includes two limiting members respectively corresponding to the two engaging hooks. Each of the limiting member is pivotally connected to the base assembly, and the two limiting members are pivotally connected to each other.

[0026] In an embodiment, the engaging hook is provided with a locking tab. The locking retention mechanism includes a locking hook and a ninth reset member. The locking hook is provided with a hook portion and is rotatably arranged in the accommodating cavity, so that the locking hook has a ninth position and a tenth position. When the locking hook is in the ninth position and the engaging hook is in the locked position, the hook portion is located on a rotation path of the engaging hook and is engaged with and limited by the locking tab. When the locking hook is in the tenth position, the hook portion deviates from the rotation path of the engaging hook to allow the engaging hook to rotate. The ninth reset member provides an elastic restoring force for the locking hook, so as to hold the locking hook in the ninth position.

[0027] In an embodiment, a cavity wall of the accommodating cavity is provided with an avoidance groove. The avoidance groove is located on a rotation path of the hook portion. During the rotation, the locking hook can enter the avoidance groove to separate the hook portion from the locking tab, thereby releasing the limitation on the engaging hook.

[0028] In an embodiment, the base assembly is provided with a receiving groove. When one of the plurality of engaging members is accommodated in the limiting groove, the receiving groove is configured to support a mounting rib on the bottom surface of the child carrier.

[0029] In an embodiment, the latching portion is a locking hole, and the first unlocking mechanism is configured to drive the locking portion of the first locking member to withdraw from the locking hole. When the driving member is in the first position, the first locking member is in the locked position; and when the driving member slides to the second position, the driving member pushes against the driving portion, so that the first locking member rotatesfrom the locked position to the unlocked position, and the locking portion withdraws from the locking hole to allow the sliding frame to extend and move forward relative to the fixed frame.

[0030] In an embodiment, the first connection mechanism further has a semi-folded state. When the first connection mechanism is in the semi-folded state, the base assembly abuts against a backrest portion of the car seat.

[0031] In an embodiment, the plug connection component further includes an external connecting tube sleeved outside the internal connecting tube and fixedly connected to the base assembly. A tube wall of the external connecting tube is provided with an insertion hole matching the second locking member.

[0032] According to another aspect of the present application, a child carrier is provided. The child carrier includes: a carrier body including the plurality of engaging members; and the connection structure as described above. The second connection mechanism of the connection structure is adapted to be detachably connected to one of the plurality of engaging members. The first connection mechanism is an ISOFIX plug, the second connection mechanism is an engaging hook, and the plurality of engaging members comprising an engaging rod.

[0033] According to another aspect of the present application, a child carrier is further provided. The child carrier includes: a carrier body and the connection structure in any one of the above embodiments. The carrier body has a plurality of engaging members. The second connection mechanism of the connection structure is adapted to be detachably connected to one of the plurality of engaging members.

[0034] In an embodiment, the carrier body has an abutting rod member. The abutting rod member may be locked on a side of the carrier body so as to push against a backrest portion of the car seat.

[0035] In an embodiment, a front end of the carrier body is provided with an abutting member. A front end of the abutting member is provided with a vertical abutting surface for abutting against the backrest portion of the car seat.

[0036] According to yet another aspect of the present application, a connection structure is further provided, configured to connect a child carrier to a car seat. The child carrier is provided with a plurality of engaging members. The connection structure includes: a base assembly; a first connection mechanism configured to be detachably connected to the car seat; and a secondconnection mechanism configured to be detachably connected to one of the plurality of engaging members. The first connection mechanism and the second connection mechanism are connected to the base assembly respectively. A shape of the second connection mechanism is configured to be adapted for connecting the one of the plurality of engaging members.

[0037] In an embodiment, the base assembly includes a first base and a second base capable of telescopically sliding back and forth relative to the first base. The first connection mechanism is connected to the first base, and the second connection mechanism is connected to the second base.

[0038] In an embodiment, the locking portion has a guide slope. When the first locking member is in the locked state, the first locking member is capable of preventing forward extending and movement of the sliding frame relative to the fixed frame, and the guide slope can be pushed by an edge of a respective one of the locking holes to allow the sliding frame to retract backward relative to the fixed frame.

[0039] In an embodiment, the base assembly further includes a first unlocking mechanism. The first unlocking mechanism is operably connected to the first locking member and configured to drive the locking portion of the first locking member to withdraw from the locking hole. The first unlocking mechanism includes a driving member. The driving member is slidably arranged in the fixed frame and has a first position and a second position. The first locking member is pivotally connected to the fixed frame and has a locked position and an unlocked position. The first locking member has a driving portion. The driving portion slidably abuts against the driving member. When the driving member is in the first position, the first locking member is in the locked position and in the locked state; and when the driving member is in the second position, the first locking member is in the unlocked position, and the locking portion withdraws from the locking hole to allow the sliding frame to extend and move forward relative to the fixed frame.

[0040] In an embodiment, the driving member is provided with a driving slope. The driving portion slidably abuts against the driving slope so that the first locking member can switch between the locked position and the unlocked position.

[0041] In an embodiment, the first unlocking mechanism further includes: a first operating member operably arranged on the second base; a linkage component located in the first baseand connected to the driving member; and a first traction component connected to the first operating member and the linkage component. When the first operating member is operated, the first operating member can drive, through the first traction component and the linkage component, the driving members to move from the first position to the second position.

[0042] In an embodiment, the first operating member is movably arranged on the second base. A moving direction of the first operating member is parallel to a moving direction of the driving member.

[0043] In an embodiment, the first traction component includes: a first traction rope; and a first traction sleeve movably sleeved outside the first traction rope. The first traction sleeve has a first sleeve end and a second sleeve end. The first traction rope has a first rope end adjacent to the first sleeve end and a second rope end adjacent to the second sleeve end. The first rope end of the first traction rope is connected to the second base, and the second rope end of the first traction rope is connected to the linkage component. The first sleeve end of the first traction sleeve is connected to the first operating member, and the second sleeve end of the first traction sleeve is connected to the first base. When the first operating member is operated, the first traction sleeve is bent and deformed so that the first traction rope pulls the linkage component to drive the driving member to move from the first position to the second position. The first traction sleeve is a bendable wire sleeve.

[0044] In an embodiment, the first unlocking mechanism further includes a first reset member. The first reset member abuts against the linkage component and is configured to drive the linkage component to be reset, so as to hold the driving member in the first position. The base assembly further includes a second reset member. The second reset member abuts against and is between the fixed frame and the first locking member, and is configured to drive the first locking member to be reset to hold the first locking member in the locked position.

[0045] In an embodiment, the sliding frame is provided with a first limiting slot. The first limiting slot extends in a sliding direction of the sliding frame. A first connecting member configured to be connected to the fixed frame is slidably provided in the first limiting slot. The first locking member is pivotally connected to the fixed frame by the first connecting member. The fixed frame is provided with a second limiting slot. The second limiting slot extends in the sliding direction of the sliding frame. A second connecting member configured to be connectedto the sliding frame is slidably provided in the second limiting slot.

[0046] In an embodiment, the first connection mechanism is movably connected to the base assembly and has an unfolded state and a folded state.

[0047] In an embodiment, the first connection mechanism includes: a plug connection component movably connected to the base assembly; and at least one connecting plug fixedly connected to the plug connection component and configured to be detachably connected to the car seat.

[0048] In an embodiment, the first connection mechanism further has a semi-folded state. When the first connection mechanism is in the semi-folded state, the base assembly abuts against the backrest portion of the car seat.

[0049] In an embodiment, the base assembly has a second locking member. The second locking member is configured to lock the first connection mechanism in the unfolded state or the folded state.

[0050] In an embodiment, the plug connection component includes an internal connecting tube. An end portion of the internal connecting tube is connected to the connecting plug. The internal connecting tube is provided with a limiting element configured to fit with the second locking member.

[0051] In an embodiment, the limiting element is a limiting slot or a limiting protrusion. When the limiting element is a limiting slot, the second locking member is a limiting protrusion. When the limiting element is a limiting protrusion, the second locking member is a limiting slot. The limiting protrusion has a third position extending into the limiting slot and a fourth position retracting from the limiting slot.

[0052] In an embodiment, an edge of at least one of the limiting element and the second locking member is provided with a guide slope adapted to release the limitation.

[0053] In an embodiment, the plug connection component further includes: an external connecting tube sleeved outside the internal connecting tube and fixedly connected to the base assembly. A tube wall of the external connecting tube is provided with an insertion hole matching the second locking member. The plug connection component further includes a wearresistant sleeve sleeved between the external connecting tube and the internal connecting tube. The wear-resistant sleeve is connected to one of the external connecting tube and the internalconnecting tube and is pivotable relative to another of the external connecting tube and the internal connecting tube. Hardness of the wear-resistant sleeve is less than that of the external connecting tube or the internal connecting tube.

[0054] In an embodiment, the second connection mechanism includes an engaging hook and a limiting groove provided on the base assembly. The limiting groove is configured to accommodate the front engaging member of the child carrier. The engaging hook is pivotally connected to the base assembly and has a locked position and an unlocked position. When the engaging hook is in the locked position, the engaging hook at least partially extends into an opening of the limiting groove to lock and limit the front engaging member.

[0055] In an embodiment, an accommodating cavity is formed in the base assembly. A groove wall of the limiting groove is provided with a perforation. The perforation is in communication with the accommodating cavity with the limiting groove. The engaging hook is provided with an accommodating groove matching the front engaging member. The accommodating groove is U-shaped. Two opposite sidewalls of the accommodating groove form a locking wall surface and a pushing wall surface respectively. When the engaging hook is in the locked position, the front engaging member abuts against the pushing wall surface, and a gap is formed between the locking wall surface and the front engaging member.

[0056] In an embodiment, the base assembly includes a locking retention mechanism. The locking retention mechanism is movably arranged in the accommodating cavity. When the engaging hook is driven to the locked position, the locking retention mechanism is configured to lock the engaging hook in the locked position. The locking retention mechanism includes a limiting member. The limiting member is movably arranged in the accommodating cavity and has a fifth position and a sixth position. One of the limiting member and the engaging hook being provided with a locking concave, and another of the limiting member and the engaging hook is provided with a first fitting portion. When the limiting member is in the fifth position, the locking concave is in concave-convex fit with the first fitting portion to lock the engaging hook in the locked position; and when the limiting member is in the sixth position, the locking concave is separated from the first fitting portion and the engaging hook is in the unlocked position. The locking retention mechanism further includes a fifth reset member. The fifth reset member provides an elastic restoring force for the limiting member to drive the limitingmember to switch to the fifth position.

[0057] In an embodiment, the locking concave is arranged at the engaging hook, the first fitting portion is arranged at the limiting member. A width of the locking concave is greater than a thickness of the first fitting portion. A pushing bump is provided in the accommodating groove. The pushing bump is arranged on the pushing wall surface and located on a movement path of the front engaging member on the pushing wall surface.

[0058] In an embodiment, the base assembly further includes a second unlocking mechanism. The second unlocking mechanism is operably connected to the limiting member and configured to drive the limiting member to move from the fifth position to the sixth position.

[0059] In an embodiment, the second unlocking mechanism includes: a second operating member slidably arranged on the base assembly and has a seventh position and an eighth position; and a second traction component connected between the second operating member and the limiting member. When the second operating member is in the seventh position, the limiting member is in the fifth position. When the second operating member is in the eighth position, the limiting member is in the sixth position. The second traction component includes a second traction rope and a second traction sleeve movably sleeved outside the second traction rope. The second traction sleeve has a first sleeve end and a second sleeve end. The second traction rope has a first rope end adjacent to the first sleeve end and a second rope end adjacent to the second sleeve end. The first rope end of the second traction rope is connected to the limiting member, and the second rope end of the second traction rope is connected to the base assembly. The first sleeve end of the second traction sleeve is connected to the base assembly, and the second sleeve end of the second traction sleeve is connected to the second operating member. When the second operating member switches from the seventh position to the eighth position, the second traction sleeve is deformed so that the second traction rope pulls the limiting member to switch from the fifth position to the sixth position. The unlocking mechanism further includes a fourth reset member. The fourth reset member provides an elastic restoring force for the second operating member to hold the second operating member in the seventh position.

[0060] In an embodiment, the base assembly has an unlock indication region. The unlock indication region indicates, according to a relative position between the second operatingmember and the base assembly, that the first locking member is in the locked position or in the unlocked position.

[0061] In an embodiment, the second connection mechanism includes two engaging hooks. The two engaging hooks are spaced apart in an extending direction of the limiting groove. The locking retention mechanism includes two limiting member respectively corresponding to the two engaging hooks. Each of the limiting members is pivotally connected to the base assembly, and the two limiting members are movably connected to each other.

[0062] In an embodiment, the unlocking mechanism includes a second operating member slidably arranged at the external connecting tube. A position of the second operating member in a left-right direction is located on an outer side the second base. The second operating member has a seventh position and an eighth position arranged in a length direction of the external connecting tube. When the second operating member is in the seventh position, relative sliding between the first base and the second base is locked. When the second operating member is in the eighth position, the first base and the second base are unlocked.

[0063] According to still another aspect of the present application, a child carrier is further provided, including: a carrier body and the connection structure according to any one of the above embodiments. A front end of the carrier body is provided with a plurality of engaging members. One of the plurality of engaging members is detachably connected to the second connection mechanism of the connection structure.

[0064] In an embodiment, the plurality of engaging members include a front engaging member arranged at the front end of the carrier body and a rear engaging member arranged at a rear end of the carrier body. A width of the second connection mechanism in a left-right direction is greater than a width of the rear engaging member in the left- right direction.

[0065] In an embodiment, a front end of the carrier body is provided with an abutting slope configured to abut against the car seat.

[0066] In an embodiment, a bottom surface of the carrier body has a mounting groove. The front engaging member is located in the mounting groove. When the connection structure is connected to the carrier body, the base assembly is engaged into the mounting groove.BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The accompanying drawings forming part of the present application are intended toprovide further understanding of the present application. Exemplary embodiments of the present application and descriptions thereof are intended to illustrate the present application, and do not constitute any inappropriate limitation on the present application.

[0068] In order to more clearly illustrate the technical solutions in embodiments of the present application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. It is apparent that, the accompanying drawings in the following description are only some embodiments of the present application, and other accompanying drawings can be obtained by those of ordinary skill in the art from the accompanying drawings without creative efforts.

[0069] In addition, the accompanying drawings are not drawn to 1 : 1 scale, and relative sizes of various elements in the accompanying drawings are drawn by way of examples only and not necessarily to true scale. In the drawings,

[0070] FIG. 1 is a perspective view of a child carrier according to an embodiment of the present application, with a carrier body connected to a connection structure;

[0071] FIG. 2 is a perspective view of the child carrier shown in FIG. 1, with the carrier body separated from the connection structure;

[0072] FIG. 3 is a perspective view of the child carrier shown in FIG. 2 from another perspective;

[0073] FIG. 4 is a perspective view of the child carrier shown in FIG. 2 from yet another perspective;

[0074] FIG. 5 is a side view of the child carrier shown in FIG. 1 mounted on a car seat;

[0075] FIG. 6 is a perspective view of the connection structure shown in FIG. 1, with an engaging hook in a locked position;

[0076] FIG. 7 is a perspective view of the connection structure shown in FIG. 1, with the engaging hook in an unlocked position;

[0077] FIG. 8 is a top view of the connection structure shown in FIG. 1, with the engaging hook in the locked position, and with a first upper shell and a second upper shell omitted;

[0078] FIG. 9 is a top view of the connection structure shown in FIG. 1, with the engaging hook in the unlocked position, and with the first upper shell and the second upper shell omitted;

[0079] FIG. 10 is a sectional view taken along a line Ul-Ul in FIG. 7, with a first lockingmember in a locked position;

[0080] FIG. 11 is a sectional view taken along the line Ul-Ul in FIG. 7, with the first locking member in an unlocked position;

[0081] FIG. 12 is a perspective view of a sliding frame in the connection structure shown in FIG. 8;

[0082] FIG. 13 is a perspective view of the sliding frame in the connection structure shown in FIG. 8 from another perspective;

[0083] FIG. 14 is a perspective view of a fixed frame in the connection structure shown in FIG. 8;

[0084] FIG. 15 is a perspective view of the first locking member in the connection structure shown in FIG. 8;

[0085] FIG. 16 is a perspective view of a driving member in the connection structure shown in FIG. 8;

[0086] FIG. 17 is a perspective view of a first operating member in the connection structure shown in FIG. 8;

[0087] FIG. 18 is a side view of the child carrier shown in FIG. 1, with a first connection mechanism in an unfolded state;

[0088] FIG. 19 is a side view of the child carrier shown in FIG. 1, with the first connection mechanism in a folded state;

[0089] FIG. 20 is a side view of the connection structure shown in FIG. 1 connected to the car seat, with the first connection mechanism in a semi-folded state;

[0090] FIG. 21 is a sectional view of the connection structure shown in FIG. 6;

[0091] FIG. 22 is a sectional view taken along a line U4-U4 in FIG. 6;

[0092] FIG. 23 is a bottom view of part of the connection structure shown in FIG. 6, with the first lower shell omitted;

[0093] FIG. 24 is a perspective view of a connector in the connection structure shown in FIG. 21;

[0094] FIG. 25 is a perspective view of a wear-resistant sleeve in the connection structure shown in FIG. 21;

[0095] FIG. 26 is a sectional view taken along a line U2-U2 in FIG. 6, with a locking hookin a locked position;

[0096] FIG. 27 is a sectional view taken along the line U2-U2 in FIG. 6, with the locking hook in an unlocked position;

[0097] FIG. 28 is a sectional view taken along a line U3-U3 in FIG. 1, with the engaging hook in the locked position;

[0098] FIG. 29 is a sectional view taken along the line U3-U3 in FIG. 1, with the engaging hook in the unlocked position;

[0099] FIG. 30 is a perspective view of the engaging hook in the connection structure shown in FIG. 8;

[0100] FIG. 31 is a perspective view of a second operating member in the connection structure shown in FIG. 8;

[0101] FIG. 32 is a perspective view of the second operating member in the connection structure shown in FIG. 8 from another perspective;

[0102] FIG. 33 is a perspective view of a child carrier according to another embodiment of the present application, with a carrier body connected to a connection structure;

[0103] FIG. 34 is a side view of the child carrier shown in FIG. 33, with a first connection mechanism in an unfolded state;

[0104] FIG. 35 is a side view of the child carrier shown in FIG. 33, with the first connection mechanism in a folded state;

[0105] FIG. 36 is a side view of the child carrier shown in FIG. 33 mounted on a car seat, with a seat surface of the car seat in a horizontal state;

[0106] FIG. 37 is a side view of the child carrier shown in FIG. 33 mounted on the car seat, with the seat surface of the car seat in an inclined state;

[0107] FIG. 38 is a perspective view of the connection structure shown in FIG. 33, with a first connection mechanism in an unfolded state;

[0108] FIG. 39 is a perspective view of the connection structure shown in FIG. 33, with the first connection mechanism in a folded state;

[0109] FIG. 40 is a perspective view of the child carrier shown in FIG. 33 from another perspective, with the connection structure separated from the carrier body;

[0110] FIG. 41 shows a perspective view of the connection structure shown in FIG. 38from another perspective, and a partial enlarged sectional view taken along a line U5-U5 in FIG. 38, with a first lower shell and a second lower shell omitted;[OHl] FIG. 42 is a sectional view taken along a line U6-U6 in FIG. 38;

[0112] FIG. 43 is a perspective view of the connection structure shown in FIG. 38 from another perspective, with the first upper shell and the second upper shell omitted;

[0113] FIG. 44 is a perspective view of the connection structure shown in FIG. 38 from yet another perspective, with the first upper shell and the second upper shell omitted;

[0114] FIG. 45 is a sectional view of the connection structure shown in FIG. 38, with a second locking member in a third position;

[0115] FIG. 46 is a sectional view of the connection structure shown in FIG. 38, with the second locking member in a fourth position;

[0116] FIG. 47 is a sectional view of a connection structure according to yet another embodiment of the present application, with the second locking member and a third unlocking mechanism omitted;

[0117] FIG. 48 is a perspective view of a child carrier according to another embodiment of the present application, with a carrier body connected to a connection structure;

[0118] FIG. 49 is a perspective view of the connection structure shown in FIG. 48, with a first upper shell omitted;

[0119] FIG. 50 is a side view of the child carrier shown in FIG. 48 mounted on a car seat, with a seat surface of the car seat in a horizontal state;

[0120] FIG. 51 is a side view of the child carrier shown in FIG. 48 mounted on the car seat, with the seat surface of the car seat in an inclined state;

[0121] FIG. 52 is a perspective view of the child carrier shown in FIG. 48 mounted on the car seat, with the connection structure including a tether strap;

[0122] FIG. 53 is a perspective view of the child carrier shown in FIG. 50;

[0123] FIG. 54 is a schematic view of part of the connection structure shown in FIG. 49, with the connection structure including another tether strap;

[0124] FIG. 55 is a sectional view taken along a line U5-U5 in FIG. 38, with the engaging hook in the locked position;

[0125] FIG. 56 is a sectional view taken along the line U5-U5 in FIG. 38, with the engaginghook in the unlocked position;

[0126] FIG. 57 is an exploded view of part of the connection structure shown in FIG. 44;

[0127] FIG. 58 is a side view of the connection structure shown in FIG. 38, with the engaging hook in the locked position; and

[0128] FIG. 59 is a side view of the connection structure shown in FIG. 38, with the engaging hook in the unlocked position.DETAILED DESCRIPTION

[0129] In order to make the above objectives, features, and advantages of the present application more obvious and understandable, specific implementations of the present application are described in detail below with reference to the accompanying drawings. In the following description, many specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other manners different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0130] FIG. 1 is a perspective view of a child carrier 1000 according to an embodiment of the present application. The child carrier 1000 may include a carrier body 100 and a connection structure 200 according to an embodiment of the present application. The child carrier 1000 and the connection structure 200 will be described below.

[0131] Referring to FIGS. 1 to 5, in an embodiment, the carrier body 100 is described by taking an infant safety carrier as an example. The infant safety carrier has a plurality of engaging members. One of the engaging members is configured to be detachably connected to the connection structure 200 according to an embodiment of the present application. According to different positions of the engaging members, the engaging members may be divided into a front engaging member 101 and a rear engaging member 102. The front engaging member 101 is located at a front end of the bottom of the infant safety carrier, and the rear engaging member 102 is located at a rear end of the bottom of the infant safety carrier. The front engaging member 101 and the rear engaging member 102 are both rod-shaped. The infant safety carrier is detachably connected to the connection structure 200 according to an embodiment of the present application through the front engaging member 101. The connection structure 200 mayalso be detachably connected to a car seat 2000, so that the infant safety carrier can be mounted on the car seat 2000. Specifically, the bottom of the carrier body 100 is provided with two mounting ribs 104. The two mounting ribs 104 are spaced apart in a left-right direction. In this way, a mounting groove 105 can be formed between the two mounting ribs 104. The front engaging member 101 and the rear engaging member 102 are both located in the mounting groove 105. A width of a portion of the mounting groove 105 corresponding to the front engaging member 101 is different from a width of a portion of the mounting groove 105 corresponding to the rear engaging member 102, so as to prevent confusion of front and rear directions when the carrier body 100 is mounted on a connection structure such as a base. In this embodiment, the width of the portion of the mounting groove 105 corresponding to the front engaging member 101 is greater than the width of the portion of the mounting groove 105 corresponding to the rear engaging member 102. In other words, a length W3 of the front engaging member 101 is greater than a length W2 of the rear engaging member 102 (see FIG. 4). It is to be noted that the left-right direction herein may refer to a second direction F2 described below. It is to be noted that the "front end" and the "rear end" as described above are distinguished based on lying postures of an infant when seated in the infant safety carrier. For example, the "front end" refers to an end of the infant safety carrier where feet of the infant are placed, and the "rear end" refers to an end where the head of the infant is placed.

[0132] In order to improve safety of the infant seated in the infant safety carrier, generally, the infant safety carrier is mounted on the car seat 2000 in a rear-facing manner (see FIG. 5). It may be understood that, when the infant is seated in the infant safety carrier, the face of the infant is facing away from a traveling direction of a car, that is, the face is facing the rear of the car. In an embodiment, as shown in FIGS. 1 and 5, an abutting slope 103 is formed at a front end of the infant safety carrier. When the infant safety carrier is mounted on the car seat 2000, the abutting slope 103 is configured to abut against a backrest portion of the car seat 2000. In this way, stability of the infant safety carrier mounted on the car seat 2000 can be improved. In another embodiment, as shown in FIGS. 33 to 35, the front end of the infant safety carrier is provided with an abutting member 106. A front end of the abutting member 106 is provided with a vertical abutting surface 1061. The vertical abutting surface 1061 is configured to abut against the backrest portion of the car seat 2000 (see FIGS. 36 and 37). In this way, an abuttingarea between the infant safety carrier and the backrest portion of the car seat 2000 is increased, which prevents backward flipping of the infant safety carrier relative to the car seat 2000, and improves safety of the infant safety carrier.

[0133] Referring to FIG. 5, an embodiment of the present application provides a connection structure 200. The connection structure 200 is configured to connect the carrier body 100 (e.g., infant safety carrier) to the car seat 2000. Specifically, as shown in FIGS. 2 to 4, the connection structure 200 may include a base assembly 20, a first connection mechanism 40, and a second connection mechanism 50. The first connection mechanism 40 and the second connection mechanism 50 are connected to the base assembly 20. Moreover, the first connection mechanism 40 is configured to be detachably connected to the car seat 2000, and the second connection mechanism 50 is configured to be detachably connected to the front engaging member 101 of the carrier body 100. Further, a shape of the second connection mechanism 50 is configured to be adapted for connecting the front engaging member 101. In this embodiment, to prevent the problem of incorrect connection (for example, the rear engaging member 102 is connected to the second connection mechanism 50), in an embodiment, a width W1 of the second connection mechanism 50 in a left-right direction (i.e., a with W1 of the portion of the base assembly 20 in the left-right direction corresponding to the second connection mechanism 50) is greater than a length W2 of the rear engaging member 102 in the left-right direction (see FIG. 4), so that the rear engaging member 102 cannot be connected to the second connection mechanism 50. It is to be noted that, in another embodiment, the second connection mechanism 50 may be engaged with the rear engaging member 102. Alternatively, in some other embodiments, the second connection mechanism 50 may be engaged with one of the front engaging member 101 and the rear engaging member 102, which is not limited herein.

[0134] In the above connection structure 200, since the first connection mechanism 40 can be detachably connected to the car seat 2000, and the second connection mechanism 50 can be detachably connected to the front engaging member 101 of the carrier body 100, when the carrier body 100 is required to be mounted on the car seat 2000, the carrier body 100 may be connected to the base assembly 20 by the second connection mechanism 50, and then the base assembly 20 is connected to the car seat 2000 by the first connection mechanism 40; or the base assembly 20 is connected to the car seat 2000 by the first connection mechanism 40, andthen the carrier body 100 is connected to the base assembly 20 by the second connection mechanism 50, to achieve a connection between the carrier body 100 and the car seat 2000. In addition, when the carrier body 100 is required to be carried by hand, the carrier body 100 may be directly separated from the base assembly 20, without carrying the entire connection structure 200. In this way, a burden of the user when carrying the carrier body 100 can be effectively reduced.

[0135] Referring to FIGS. 6 and 7, in an embodiment, the base assembly 20 includes a first base 201 and a second base 202 capable of telescopically sliding back and forth relative to the first base 201. Specifically, the second base 202 is slidably sleeved outside the first base 201. In another alternative embodiment, the first base 201 is slidably sleeved outside the second base 202. In another embodiment, the first base 201 and the second base 202 are fixedly connected and cannot slide relative to each other. Still referring to FIGS. 6 and 7, in an embodiment, the first connection mechanism 40 is connected to the first base 201, and the second connection mechanism 50 is connected to the second base 202. In this way, by sliding the second base 202 relative to the first base 201, a length of the base assembly 20 in a frontrear direction (which may also be referred to as a first direction Fl) can be adjusted, thereby enabling the connection structure 200 to adapt to car seats 2000 of different sizes. In another alternative embodiment, the first connection mechanism 40 is connected to the second base 202, and the second connection mechanism 50 is connected to the first base 201. Specifically, in this embodiment, FIGS. 6 and 7 show that the second base 202 is sleeved on the first base 201, the first connection mechanism 40 is connected to the first base 201, and the second connection mechanism 50 is connected to the second base 202. In an embodiment, as shown in FIGS. 1 and 4, in order to make the structure of the base assembly 20 more compact, a width of the second base 202 of the base assembly 20 is less than a width of the mounting groove 105 of the carrier body 100. When the connection structure 200 is connected to the front engaging member 101 of the carrier body 100, the second base 202 of the base assembly 20 is engaged into the mounting groove 105 of the carrier body 100. In this case, the two mounting ribs 104 at the bottom of the carrier body 100 are respectively located on two sides of the second base 202 (see FIG. 1).

[0136] In another embodiment, as shown in FIGS. 33, 38, and 40, the width of the secondbase 202 may be greater than the width of the mounting groove 105 of the carrier body 100, or the width of the second base 202 may be greater than a width of the carrier body 100. Specifically, the second base 202 is provided with two receiving grooves 204. The two receiving grooves 204 are respectively located on two sides of the second connection mechanism 50. Therefore, when the connection structure 200 is connected to the front engaging member 101 of the carrier body 100, a middle part of the second base 202 of the base assembly 20 (i.e., a part provided with the second connection mechanism 50) is engaged into the mounting groove 105, and the two mounting ribs 104 are respectively accommodated in the two receiving grooves 204 (see FIG. 33). In this way, an area of contact between the carrier body 100 and the base assembly 20 can be increased, which improves stability of support for the carrier body 100. It is to be noted that unless otherwise specified, orientational terms such as "front" and "back" in the embodiments of the present application are based on orientations shown in the figures. In the figures, an arrow B and an arrow P indicate a front direction and a rear direction respectively. These orientational terms are only used to make the description of the embodiments of the present application clearer, and are not used to improperly limit the protection scope of the present application. Specifically, the front-rear direction in this embodiment may specifically refer to an orientation of the car during normal driving.

[0137] Referring to FIGS. 6 to 9, the first base 201 includes a first upper shell 201 A and a first lower shell 201B that are fastened to each other. The first upper shell 201A and the first lower shell 20 IB define a first chamber 201C with an opening. The second base 202 includes a second upper shell 202A and a second lower shell 202B that are fastened to each other. The second upper shell 202A and the second lower shell 202B define a second chamber 202C with an opening. The first chamber 201C and the second chamber 202C are in communication with each other through the respective openings to form an accommodating cavity 203.

[0138] Referring to FIGS. 8 to 11, in an embodiment, the base assembly 20 further includes a fixed frame 210 and a sliding frame 220. The fixed frame 210 and the sliding frame 220 are both accommodated in the accommodating cavity 203. The fixed frame 210 is connected to the first base 201. The sliding frame 220 is connected to the second base 202 and is slidingly connected to the fixed frame 210. The sliding frame 220 can slide forward and backward relative to the fixed frame 210. In another alternative embodiment, the fixed frame 210 isconnected to the second base 202, and the sliding frame 220 is connected to the first base 201. In this way, the relative position between the second base 202 and the first base 201 can be changed by changing the relative position between the sliding frame 220 and the fixed frame 210. That is, a length of the base assembly 20 in the front-rear direction (i.e., the first direction Fl) is changed.

[0139] Referring to FIGS. 8 and 9, in an embodiment, the fixed frame 210 is detachably or fixedly arranged in the first chamber 201C; and the sliding frame 220 is detachably or fixedly arranged in the second chamber 202C.

[0140] Still referring to FIGS. 8 and 9, in an embodiment, one of the sliding frame 220 and the fixed frame 210 is provided with a plurality of latching portions 221. The plurality of latching portions 221 are spaced apart in a sliding direction of the sliding frame 220 (i.e., the front-rear direction). The base assembly 20 further includes a first locking member 230. The first locking member 230 is movably supported on another of the sliding frame 220 and the fixed frame 210 to allow a first locking portion 231 of the first locking member 230 to be engaged with and disengaged from a respective one of the latching portions 221. The latching portions 221 are, for example, locking holes or locking teeth. Specifically, in this embodiment, the latching portions 221 are locking holes. When the sliding frame 220 is provided with a plurality of locking holes 221 (see FIGS. 12 and 13 for details), the first locking member 230 is pivotably arranged on the fixed frame 210. Alternatively, when the fixed frame 210 is provided with a plurality of locking holes 221, the first locking member 230 is pivotably arranged on the sliding frame 220. In this embodiment, referring to FIGS. 10 to 13, the sliding frame 220 is provided with the plurality of locking holes 221, and the first locking member 230 is pivotably arranged on the fixed frame 210. Specifically, as shown in FIGS. 10 and 11, the first locking portion 231 has a guide slope 2311 (see FIG. 15 for details). The guide slope 2311 faces forward. When the first locking member 230 is engaged with the locking hole, that is, when the first locking member 230 extends into the locking hole, the first locking portion 231 of the first locking member 230 can limit forward extending and movement of the sliding frame 220 relative to the fixed frame 210, and the guide slope 2311 of the first locking portion 231 can be pushed by an edge of a respective one of the locking holes 221 to cause the first locking portion 231 to withdraw from the locking hole 221, thereby allowing the sliding frame 220 toretract backward relative to the fixed frame 210. In other words, when the first locking portion 231 of the first locking member 230 is inserted into the locking hole 221, under the action of the guide slope 2311, the sliding frame 220 (and hence the second base 202) can be allowed to move backward relative to the fixed frame 210 (and hence the first base 201), thereby shortening the length of the base assembly 20 in the front-rear direction (i.e., the first direction Fl), but the sliding frame 220 (and hence the second base 202) is not allowed to move forward relative to the fixed frame 210 (and hence the first base 201), thereby preventing an increase in the length of the base assembly 20 in the front-rear direction (i.e., the first direction Fl).

[0141] Specifically, in this embodiment, as shown in FIGS. 10 and 11, the first locking member 230 is pivotally connected to the fixed frame 210, and the guide slope 2311 faces forward.

[0142] In order to improve convenience of adjustment of the length of the base assembly 20 in the front-rear direction (i.e., the first direction Fl), as shown in FIGS. 8 to 11, in an embodiment, the base assembly 20 may further include a first unlocking mechanism 240. The first unlocking mechanism 240 is operably connected to the first locking member 230 and is configured to drive the first locking portion 231 of the first locking member 230 to withdraw from the locking hole 221. In this way, after the first locking portion 231 withdraws from the locking hole 221, the sliding between the sliding frame 220 and the fixed frame 210 is not limited, and then the sliding frame 220 (and hence the second base 202) can be pushed to move forward relative to the fixed frame 210 (and hence the first base 201), to increase the length of the base assembly 20.

[0143] Referring to FIGS. 10 and 11, in an embodiment, the first unlocking mechanism240 may include a driving member 241. The driving member 241 is slidably arranged in the fixed frame 210 and has a first position and a second position. The driving member 241 is provided with a driving slope 2411 (see FIG. 16 for details). Specifically, the driving member241 slides on the fixed frame 210 in the front-rear direction (i.e., the first direction Fl). The fixed frame 210 is provided with a first guide hole 214 (see FIG. 14). The driving member 241 is provided with a guide post 2412 (see FIG. 16). The guide post 2412 is in sliding fit with the first guide hole 214 and is configured to guide the movement of the driving member 241. More specifically, the first locking member 230 is pivotally connected to the fixed frame 210 and hasa locked position and an unlocked position. The first locking member 230 further has a driving portion 232. The driving portion 232 is configured to abut against the driving slope 2411 and slidable along the driving slope 2411 to enable the first locking member 230 to switch between the locked position and the unlocked position. More specifically, when the driving member 241 is in the first position, the first locking member 230 is in the locked position and in the locked state. When the driving member 241 moves from the first position to the second position, the driving portion 232 slides along the driving slope 2411, thereby driving the first locking member 230 to pivot from the locked position to the unlocked position. When the driving member 241 is in the second position, the first locking member 230 is in the unlocked position, and the first locking portion 231 withdraws from the locking hole 221 to allow the sliding frame 220 to extend and move forward relative to the fixed frame 210.

[0144] In order to facilitate the control over switching of the driving member 241 between the first position and the second position, in an embodiment, as shown in FIGS. 8 and 9, the first unlocking mechanism 240 may further include a first operating member 242, a linkage component 243, and a first traction component 244. Specifically, the first operating member 242 is operably arranged on the second base 202. The linkage component 243 is at least partially located in the first base 201 and is connected to the driving member 241. The first traction component 244 is connected to the first operating member 242 and the linkage component 243. More specifically, when the first operating member 242 is operated, the first operating member 242 can, through the first traction component 244 and the linkage component 243, drive the driving member 241 to move from the first position to the second position.

[0145] Referring to FIGS. 8 and 9, in an embodiment, the first operating member 242 is movably arranged on the second base 202, and the moving direction of the first operating member 242 is parallel to a moving direction of the driving member 241. That is, the first operating member 242 can move on the second base 202 in the front-rear direction (i.e., the first direction Fl).

[0146] Specifically, as shown in FIGS. 3 and 4, the second base 202 is provided with an operating hole 2021. The operating hole 2021 is located on a side of the second base 202 away from the first base 201. As shown in FIGS. 8 and 9, the first operating member 242 extendsthrough the operating hole 2021 and is connected to a first traction sleeve 2442 (which will be described later).

[0147] Still referring to FIGS. 8 and 9, in an embodiment, the first traction component 244 includes a first traction rope 2441 and a first traction sleeve 2442 movably sleeved on the first traction rope 2441. The first traction sleeve 2442 has a first sleeve end 24421 and a second sleeve end 24422. The first traction rope 2441 has a first rope end (not shown) adjacent to the first sleeve end 24421 and a second rope end 24412 adjacent to the second sleeve end 24422. Specifically, the first rope end of the first traction rope 2441 is connected to the second base 202, and the second rope end 24412 of the first traction rope 2441 is connected to the linkage component 243. The first sleeve end 24421 of the first traction sleeve 2442 is connected to the first operating member 242, and the second sleeve end 24422 of the first traction sleeve 2442 is connected to the first base 201. When the first operating member 242 is operated, the first traction sleeve 2442 may be bent and deformed so that the first traction rope 2441 pulls the linkage component 243 to drive the driving member 241 to move from the first position to the second position.

[0148] Specifically, in this embodiment, the first traction sleeve 2442 is a bendable wire sleeve. Moreover, it is to be noted that the first traction sleeve 2442 may be made of a hard but bendable material, for example, may be a bendable tubular structure made of metal (such as steel) or plastic (such as polyvinyl chloride (PVC)).

[0149] In an embodiment, as shown in FIG. 14, the fixed frame 210 is provided with an avoidance hole 211. The avoidance hole 211 extends in a sliding direction of the driving member 241. As shown in FIGS. 8 and 9, the linkage component 243 includes a linkage block 2431 and a linkage rod 2432 that are connected to each other. The second rope end 24412 of the first traction rope 2441 is connected to the linkage block 2431. The linkage rod 2432 extends through the avoidance hole 211 and is connected to the driving member 241 in a driven manner to allow the first traction component 244 to drive, through the second rope end 24412, the linkage block 2431 to move, thereby driving, through the linkage rod 2432, the driving member 241 to move.

[0150] In an embodiment, as shown in FIG. 17, the first operating member 242 is provided with a first fixed portion 2421 and a second guide hole 2422. As shown in FIGS. 8 and 9, thefirst fixed portion 2421 is configured to be connected to the first sleeve end 24421 of the first traction sleeve 2442. The second guide hole 2422 extends in the moving direction of the first operating member 242. More specifically, the second chamber 202C is provided with a column 245. The column 245 is inserted into the second guide hole 2422. Through the guide fit between the column 245 and the second guide hole 2422, the offset of the movement of the first operating member 242 can be prevented. In this embodiment, two second guide holes 2422 are provided. The two second guide holes 2422 are distributed on two sides of the first fixed portion 2421. The column 245 is formed by a threaded connector (such as a screw or a bolt) connected to the second base 201. Two columns 245 are provided. The two columns 245 are in guide fit with the second guide holes 2422 respectively.

[0151] Referring to FIGS. 8 and again, in an embodiment, the first unlocking mechanism 240 further includes a first reset member 250. The first reset member 250 abuts against the linkage component 243 and is configured to drive the linkage component 243 to be reset, so as to hold the driving member 241 in the first position. The first reset member 250 is, for example, a spring. The spring is sleeved outside the first traction rope 2441, and abuts against and is between the linkage block 2431 and the second sleeve end 24422. Further, in an embodiment, the first unlocking mechanism 240 further includes an operating reset member (not shown). The operating reset member abuts against the first operating member 242 and is configured to drive the first operating member 242 to be reset.

[0152] Still referring to FIGS. 8 and 9, in an embodiment, the base assembly 20 further includes a second reset member 260. The second reset member 260 abuts against and is between the fixed frame 210 and the first locking member 230 and is configured to drive the first locking member 230 to be reset to hold the first locking member 230 in the locked position. The second reset member 260 is, for example, a torsion spring. The torsion spring is sleeved on the first connecting member 223, and abuts against and is between the fixed frame 210 and the first locking member 230.

[0153] An operating principle and process of the first unlocking mechanism 240 are illustrated below with reference to FIGS. 8 to 11.

[0154] Referring to FIG. 10, specifically, when the length of the base assembly 20 in the front-rear direction is required to be reduced, the user may directly push the second base 202backward, and the edge of the locking hole 221 pushes against the guide slope 2311 of the first locking portion 231 so that the first locking portion 231 withdraws from the locking hole 221, thereby allowing the sliding frame 220 to retract backward relative to the fixed frame 210 and shortening the length of the base assembly 20 in the front-rear direction (i.e., the first direction Fl).

[0155] Referring to FIGS. 8 and 9, when the length of the base assembly 20 in the frontrear direction is required to be increased, the user needs to push the first operating member 242 backward in the front-rear direction. When moving backward, the first operating member 242 may drive the first sleeve end 24421 of the first traction sleeve 2442 to move together, so that the first traction sleeve 2442 may be bent, thereby causing the first traction rope 2441 to bend along with the first traction sleeve 2442. Since the first rope end of the first traction rope 2441 is fixed, when the first traction rope 2441 is bent, a distance between the first rope end and the second rope end 24412 is shortened, causing the second rope end 24412 to move towards the first rope end, that is, causing the second rope end 24412 to move forward in the front-rear direction. In other words, when moving backward, the first operating member 242 may drive the first sleeve end 24421 of the first traction sleeve 2442 to move together, a distance between the first sleeve end 24421 and the first rope end becomes large, and a length of the first traction rope 2441 between the first sleeve end 24421 and the second sleeve end 24422 remains unchanged. Therefore, a distance between the second sleeve end 24422 and the second rope end 24412 is shortened. That is, the second rope end 24412 moves forward in the front-rear direction. Therefore, the second rope end 24412 can drive the linkage component 243 to move forward in the front-rear direction, that is, drive the driving member 241 to move forward, so that the driving member 241 may move from the first position to the second position. Since the driving slope 2411 abuts against the driving portion 232, when the driving member 241 moves forward, the first locking member 230 can be rotated counterclockwise around the first connecting member 223, that is, can switch from the state shown in FIG. 10 to the state shown in FIG. 11, so that the first locking portion 231 can withdraw from the locking hole 221. That is, the first locking member 230 is switched from the locked position (see FIG. 10) to the unlocked position (see FIG. 11). In this case, relative movement between the sliding frame 220 and the fixed frame 210 is not limited, and the length of the base assembly 20 can be freelyadjusted, for example, the length of the base assembly 20 can be increased herein.

[0156] After a movement position of the sliding frame 220 relative to the fixed frame 210 is determined, that is, after a movement position of the second base 202 relative to the first base 201 is determined, the first operating member 242 is released, and the first reset member 250 is reset to push the linkage component 243 to move backward in the front-rear direction, thereby causing the driving member 241 to move backward. That is, the driving member 241 is moved from the second position to the first position. In this case, under the action of the second reset member 260, the first locking member 230 can rotate clockwise around the first connecting member 223, i.e., switch from the state shown in FIG. 11 to the state shown in FIG. 10), so that the first locking portion 231 extends into the locking hole 221. That is, the first locking member 230 is switched from the unlocked position (see FIG. 11) to the locked position (see FIG. 10). In this case, the sliding frame 220 is allowed to move backward relative to the fixed frame 210 (that is, the length of the base assembly 20 is shortened), and is prevented from moving forward relative to the fixed frame 210 (that is, an increase in the length of the base assembly 20 is prevented).

[0157] Referring to FIGS. 41 and 42, in some other embodiments, the first unlocking mechanism 240 includes a driving member 241, a first operating member 242, and a linkage component 243. This embodiment (see FIGS. 41 and 42) differs from the above embodiments (see FIG. 10 and FIG. 11) in at least following configurations.

[0158] As shown in FIGS. 41 and 42, in another embodiment, the first base 201 (e.g., the first lower shell 201B) is provided with an operating hole 2021. The first operating member 242 is movably arranged at the operating hole 2021. A moving direction of the first operating member 242 is the same as a moving direction of the driving member 241, that is, moves in the front-rear direction (i.e., the first direction Fl). The linkage component 243 is located in the first base 201 (i.e., the first chamber 201C) and is connected between the first operating member 242 and the driving member 241. Therefore, when the first operating member 242 is operated, for example, when the first operating member 242 is pushed and pulled in the frontrear direction, the first operating member 242 drives the linkage component 243 to move to drive the driving member 241 to move from the first position to the second position. It is to be noted that, in this embodiment, the linkage component 243 may include only the linkage rod2432. In this embodiment, the first unlocking mechanism 240 further includes a first reset member 250. The first reset member 250 abuts against the driving member 241 and is configured to drive the driving member 241 to be reset, so as to hold the driving member 241 in the first position. Specifically, the first reset member 250 is, for example, a spring. The driving member 241 is provided with a driving slot 2413. An extending direction of the driving slot 2413 is substantially the same as the moving direction of the driving member 241. That is, the driving slot 2413 extends in the front-rear direction (i.e., the first direction Fl). The fixed frame 210 is provided with an abutting portion 215. The abutting portion 215 at least partially extends into the driving slot 2413. The first reset member 250 is arranged in the driving slot 2413. An end of the first reset member 250 abuts against the abutting portion 215, and another end of the first reset member 250 abuts against an inner sidewall of the driving slot 2413 facing away from the driving slope 2411. In this way, the first reset member 250 pushes the driving member 241 to move backward in the front-rear direction. The first unlocking mechanism 240 in this embodiment has a simple structure and is relatively convenient to operate.

[0159] Still referring to FIGS. 41 and 42, in another embodiment, the base assembly 20 further includes an elastic member 350. A first stopping portion 206 is provided in the first base 201. A second stopping portion 207 is provided in the second base 202. The elastic member 350 abuts against and is between the first stopping portion 206 and the second stopping portion 207, so that the first base 201 and the second base 202 have a tendency to move away from each other. In this way, after the first locking portion 231 of the first locking member 230 withdraws from the locking hole 221, the relative movement between the sliding frame 220 and the fixed frame 210 is not limited. Therefore, pushed by the elastic member 350, the second base 202 can directly slide relative to the first base 201. In this way, the length of the base assembly 20 can be automatically increased.

[0160] Specifically, as shown in FIGS. 41 and 42, at least one of the first stopping portion 206 and the second stopping portion 207 is provided with a guide rod 208. The elastic member 350 is, for example, a compression spring. The elastic member 350 is sleeved outside the guide rod 208. Two ends of the elastic member 350 abut against the first stopping portion 206 and the second stopping portion 207 respectively. In this way, when the sliding frame 220 moves relative to the fixed frame 210 to reduce the length of the base assembly 20, the guide rod 208can prevent deflection or bending of the elastic member 350 during compression.

[0161] As shown in FIGS. 10 and 11, in an embodiment, to prevent the offset of the movement of the sliding frame 220 as it moves relative to the fixed frame 210 and also to prevent separation of the sliding frame 220 from the fixed frame 210due to excessive sliding, the sliding frame 220 is provided with a first limiting slot 222. The first limiting slot 222 extends in the sliding direction of the sliding frame 220. A first connecting member 223 configured to be connected to the fixed frame 210 is slidably provided in the first limiting slot 222. The first locking member 230 is pivotally connected to the fixed frame 210 by the first connecting member 223. In this embodiment, the fixed frame 210 is further provided with a second limiting slot 212. The second limiting slot 212 extends in the sliding direction of the sliding frame 220. A second connecting member 213 configured to be connected to the sliding frame 220 is slidably provided in the second limiting slot 212. In this way, the sliding frame 220 can slide relative to the fixed frame 210 more stably, further preventing shaking or offset of the sliding frame 220 as it moves relative to the fixed frame 210. In this embodiment, the second connecting member 213 is located at the rear of the first connecting member 223 at a level higher than the first connecting member 223, that is, is located above and behind the first connecting member 213. The first locking portion 231 of the first locking member 230 is located at the rear of the first connecting member 223, and at least part of the first locking member 230 is located below the second connecting member 213. When the first locking member 230 is in the locked position, the first locking member 230 and the second connecting member 213 are spaced apart. When the first locking member 230 is pushed by the driving member 241 and pivots to the unlocked position, the first locking member 230 is blocked by the second connecting member 213, thereby preventing the first locking member 230 from further pivoting, so that a movement stroke of the driving member 241 can be limited.

[0162] Referring to FIGS. 8 and 9, in an embodiment, two sliding frames 220 and two fixed frames 210 are provided in the accommodating cavity 203 and are in one-to-one correspondence and in sliding connection. Specifically, the two fixed frames 210 are spaced apart in the left-right direction (which may be referred to as a second direction F2). The second direction F2 is not parallel to the first direction Fl. More specifically, the second direction F2 is substantially perpendicular to the first direction Fl. Further, two first locking members 230and two driving members 241 are provided. Each fixed frame 210 is pivotally connected to one first locking member 230, and each fixed frame 210 is provided with one driving member 241. More specifically, components such as the first operating member 242 and the linkage component 243 are all arranged between the two fixed frames 210, and two ends of the linkage rod 2432 are connected to the two driving members 241 respectively in a driven manner. In this way, when the first operating member 242 is pushed, under the action of the linkage component 243, the two driving members 241 can be switched from the first position to the second position at the same time. That is, the two first locking members 230 are driven to switch from the locked position to the unlocked position at the same time.

[0163] It is to be noted that unless otherwise specified, orientational terms such as "left" and "right" in the embodiments of the present application are based on orientations shown in the figures. In the figures, an arrow L and an arrow R indicate a left direction and a right direction respectively. These orientational terms are only used to make the description of the embodiments of the present application clearer, and are not used to improperly limit the protection scope of the present application. Specifically, the left-right direction in this embodiment may specifically refer to an orientation of the width of the car.

[0164] Referring to FIG. 5, when the above connection structure 200 is used, the base assembly 20 may be first mounted on the car seat 2000 of the car through the first connection mechanism 40. Then, the first locking member 230 may be switched to the unlocked position by manipulating (such as pressing or pushing) the first operating member 242, thereby releasing the limitation on the sliding frame 220. As such, the second base 202 may move forward relative to the first base 201 so that the length of the base assembly 20 is relatively large, thereby leaving a large operating space between the base assembly 20 and the backrest portion of the car seat 2000, so as to quickly mount the carrier body 100 on the base assembly 20 through the second connection mechanism 50. After the carrier body 100 is mounted on the base assembly 20, the position of the carrier body 100 may be adjusted through the base assembly 20 according to an actual situation. For example, when the carrier body 100 is required to be moved backward to enable the abutting slope 103 of the carrier body 100 to abut against the backrest portion of the car seat 2000, the second base 202 may be directly pushed backward. As can be seen, when the above base assembly 20 has a telescopic structure, it isbeneficial to achieve rapid mounting of the carrier body 100, and at the same time, the connection structure 200 can adapt to car seats 2000 of different sizes.

[0165] Referring to FIGS. 18 and 19 or FIGS. 34 and 35, in an embodiment, the first connection mechanism 40 is movably connected to the base assembly 20 and has an unfolded state and a folded state. A projection length of the connection structure 200 on a horizontal plane when the first connection mechanism 40 is in the unfolded state is greater than a projection length of the connection structure 200 on the horizontal plane when the first connection mechanism 40 is in the folded state. In this embodiment, the horizontal plane is roughly parallel to the front-rear direction (i.e., the first direction Fl) and parallel to the leftright direction (i.e., the second direction F2 below). When the first connection mechanism 40 is in the folded state, the first connection mechanism 40 may overlap with the base assembly 20 in the first direction F 1 ; and when the first connection mechanism 40 is in the unfolded state, the first connection mechanism 40 protrudes from the base assembly 20 in the first direction. In other embodiments, the first connection mechanism 40 is fixedly mounted on the base assembly 20.

[0166] It is to be noted that the "movably" may mean that the first connection mechanism 40 is pivotally connected to the base assembly 20, so that the first connection mechanism 40 has an unfolded state and a folded state; or mean that the first connection mechanism 40 is telescopically connected to the base assembly 20, so that the first connection mechanism 40 has an unfolded state and a folded state.

[0167] Referring to FIGS. 8 and 9 or FIGS. 21 and 22, in an embodiment, the first connection mechanism 40 may include a plug connection component 410 and at least one connecting plug 420. The plug connection component 410 is pivotally connected to the base assembly 20, specifically pivotally connected to the first base 201. The connecting plug 420 is fixedly connected to the plug connection component 410, mainly configured to be detachably connected to the car seat 2000. Specifically, two connecting plugs 420 are provided. The two connecting plugs 420 are respectively arranged at two ends of the plug connection component 410. More specifically, in an embodiment, when the first connection mechanism 40 is in the unfolded state, an angle al between the connecting plug 420 and the base assembly 20 is substantially 180 degrees (see FIGS. 8 and 18 or FIGS. 34 and 38). When the angle al is about180 degrees, the connection structure 200 is mainly configured to mount the carrier body 100 to the car seat 2000 with a seat surface in a horizontal state (the details of this mounting will be described later). In other embodiments, when the first connection mechanism 40 is in the unfolded state, the angle al may alternatively be greater than 180 degrees, such as 200 degrees or 220 degrees (see FIG. 37). When the angle al is greater than 180 degrees, the connection structure 200 is mainly configured to mount the carrier body 100 to the car seat 2000 with the seat surface in an inclined state (the details of this mounting will be described later). When the first connection mechanism 40 is in the folded state, the angle al between the connecting plug 420 and the base assembly 20 is substantially 0 degrees (see FIGS. 19 or 35). In this way, when the carrier body 100 is required to be mounted to the car seat 2000 by using the connection structure 200, the first connection mechanism 40 is directly unfolded to be in the unfolded state (see FIGS. 18 or 34), and then the connection between the carrier body 100 and the car seat 2000 is achieved through the first connection mechanism 40 and the second connection mechanism 50. When the connection structure 200 is required to be carried along with the carrier body 100, the connection between the carrier body 100 and the base assembly 20 can be maintained. Then, the connecting plug 420 is rotated to cause the plug connection component 410 to rotate by nearly 180 degrees in the first base 201, so that the first connection mechanism 40 is in the folded state, that is, the first connection mechanism 40 is folded on the carrier body 100 (see FIGS. 19 or 35) for easy carrying.

[0168] Referring to FIG. 20, in an embodiment, the first connection mechanism 40 further has a semi-folded state. Moreover, when the first connection mechanism 40 is in the semifolded state, the angle al between the connecting plug 420 and the base assembly 20 is an acute angle, and the base assembly 20 abuts against the backrest portion of the car seat 2000. After the carrier body 100 is separated from the connection structure 200, the base assembly 20 may be rotated so that the base assembly 20 and the plug connection component 410 rotate relative to each other until the angle al between the connecting plug 420 and the base assembly 20 becomes an acute angle, which can reduce an area occupied by the connection structure 200 on the car seat 2000, thereby not affecting normal use of the car seat 2000.

[0169] As can be seen from the above description, the first connection mechanism 40 has a first pivot position, a second pivot position, a third pivot position, and a fourth pivot positionrelative to the base assembly 20. Moreover, the first connection mechanism 40 may also be locked at each of the above pivot positions. That is, the first connection mechanism 40 may be respectively locked at the first pivot position, the second pivot position, the third pivot position, and the fourth pivot position. Specifically, when the first connection mechanism 40 is in the first pivot position (see FIG. 19), the first connection mechanism 40 is in the folded state. In this case, the angle al is about 0 degrees. When the first connection mechanism 40 is in the second pivot position (see FIGS. 18 or 36 or 50), the first connection mechanism 40 is in the unfolded state. In this case, the angle al is about 180 degrees. When the first connection mechanism 40 is in the third pivot position (see FIGS. 37 or 51), the first connection mechanism 40 is in the unfolded state, and extending directions of the first connection mechanism 40 and the base assembly 20 are not parallel to each other. In this case, the angle al is greater than 180 degrees. When the first connection mechanism 40 is in the fourth pivot position (see FIG. 20), the first connection mechanism 40 is in the semi-folded state, and the base assembly 20 is adapted to abut against the backrest portion of the car seat 2000. In this case, the angle al is greater than 180 degrees.

[0170] Referring to FIG. 21, in an embodiment, the base assembly 20 has a second locking member 270. The second locking member 270 is configured to lock the first connection mechanism 40 in the unfolded state or the folded state.

[0171] Referring to FIGS. 21 to 24, in an embodiment, the plug connection component 410 is provided with a limiting slot 430. The second locking member 270 is a limiting protrusion. The second locking member 270 is movably arranged relative to the plug connection component 410, so that the second locking member 270 has a third position at which the second locking member 270 extends into the limiting slot 430, and a fourth position at which the second locking member 270 retracts from the limiting slot 430. Specifically, in this embodiment, the plug connection component 410 includes a connector 411 and two internal connecting tubes 412 fixedly connected to two ends of the connector 411 respectively. The two internal connecting tubes 412 are connected to the connector 411 through fasteners such as screws. Specifically, the connector 411 and the internal connecting tubes 412 respectively connected to the two ends of the connector 411 are rotatably arranged in the first base 201. More specifically, the connector 411 can rotate about a rotation axis X-X. The connector 411is provided with the limiting slot 430. The second locking member 270 is movably arranged relative to the connector 411. An end of each internal connecting tube 412 away from the connector 411 is connected to the corresponding connecting plug 420. In one or more embodiments, the second locking member 270 may be a limiting slot, the plug connection component 410 may include only a complete internal connecting tube, and a limiting protrusion is provided in the middle of the internal connecting tube.

[0172] In an embodiment, as shown in FIGS. 21 and 24, the limiting slot 430 is provided with a first slot 431 and a second slot 432. The first slot 431 and the second slot 432 are arranged opposite to each other. When the second locking member 270 extends into the first slot 431, the first connection mechanism 40 is locked to the unfolded state. When the second locking member 270 extends into the second slot 432, the first connection mechanism 40 is locked to the folded state. In another embodiment, alternatively, when the second locking member 270 extends into the first slot 431, the first connection mechanism 40 is locked to the folded state, and when the second locking member 270 extends into the second slot 432, the first connection mechanism 40 is locked to the unfolded state.

[0173] Referring to FIG. 21, in an embodiment, the base assembly 20 further includes a third reset member 280. The third reset member 280 abuts against the second locking member 270 and is configured to drive the second locking member 270 to remain in the third position. The third reset member 280 is, for example, a spring. The spring abuts against the second locking member 270.

[0174] Referring to FIG. 24, in an embodiment, edges of the first slot 431 and the second slot 432 are respectively provided with guide slopes 433 to allow the second locking member 270 to withdraw from the first slot 431 or the second slot 432 along the respective one of the guide slopes 433. In this way, when the user needs to change the state of the first connection mechanism 40, that is, switch the first connection mechanism from the folded state to the unfolded state or from the unfolded state to the folded state, the connecting plug 420 can be directly rotated without unlocking, so that the connecting plug 420 drives the internal connecting tube 412 and the connector 411 to rotate around the rotation axis X-X, thereby improving convenience of switching between states. In addition, after the carrier body 100 is mounted on the car seat 2000 through the connection structure 200, if the car accelerates rapidly,the carrier body 100 and the base assembly 20 both have a tendency to tilt backward clockwise under an inertial force. In this case, under the action of the guide slope 433, the second locking member 270 can withdraw from the first slot 431 and the base assembly 20 has a tendency to rotate around the rotation axis X-X relative to the internal connecting tube 412 and the connector 411, thereby preventing detachment of the carrier body 100 from the base assembly 20 due to separation of the carrier body 100 from the second connection mechanism 50 when the carrier body 100 tilts backward.

[0175] Referring to FIGS. 21 and 22, in an embodiment, the plug connection component 410 further includes an external connecting tube 413 and a rotation locking mechanism 415. The external connecting tube 413 is sleeved outside the internal connecting tube 412 and is fixedly connected to the base assembly 20. The internal connecting tube 412 can rotate relative to the external connecting tube 413. A tube wall of the external connecting tube 413 is provided with an insertion hole through which the second locking member 270 can extend through. The second locking member 270, after extending through the insertion hole, may extend into the first slot 431 or the second slot 432. The rotation locking mechanism 415 is connected between the internal connecting tube 412 and the external connecting tube 413. The rotation locking mechanism 415 has a locked state and an unlocked state. When the rotation locking mechanism 415 is in the locked state, the internal connecting tube 412 is prevented from rotating relative to the external connecting tube 413. When the rotation locking mechanism 415 is in the unlocked state, the internal connecting tube 412 is allowed to rotate relative to the external connecting tube 413. The rotation locking mechanism 415 includes a second locking member 270 arranged on the internal connecting tube 412 and a second fitting portion 4131 arranged on the external connecting tube 413. The second locking member 270 can be in locking fit with the second fitting portion 4131 to prevent the internal connecting tube 412 from rotating relative to the external connecting tube 413. How the second locking member 270 and the second fitting portion 4131 achieve locking fit will be described in detail below. Details thereof are not described herein.

[0176] Referring to FIGS. 21 and 25, in an embodiment, the plug connection component 410 further includes a wear-resistant sleeve 414. The wear-resistant sleeve 414 is sleeved between the external connecting tube 413 and the internal connecting tube 412 in a sleevingmanner. The wear-resistant sleeve 414 is connected to one of the external connecting tube 413 and the internal connecting tube 412 and is pivotable relative to another of the external connecting tube 413 and the internal connecting tube 412. In this way, smoothness of the rotation of the internal connecting tube 412 is improved, and the service life of the internal connecting tube 412 and the external connecting tube 413 is prolonged. Specifically, in this embodiment, the wear-resistant sleeve 414 is connected to the external connecting tube 413 and is pivotable relative to the internal connecting tube 412. More specifically, the wearresistant sleeve 414 is provided with an elastic arm 4141. The elastic arm 4141 is provided with a limiting structure 4142. The external connecting tube 413 is provided with an engaging hole. The engaging hole is configured to be engaged with the limiting structure 4142. In an embodiment, the external connecting tube 413 and the internal connecting tube 412 are made of steel, aluminum, or other metals, the wear-resistant sleeve 414 is made of resin, polyethylene, or other materials, and hardness of the wear-resistant sleeve 414 is less than that of the external connecting tube 413 or the internal connecting tube 412.

[0177] Referring to FIGS. 43 to 46, in another embodiment, the second locking member 270 may be, for example, a sleeve structure. The second locking member 270 is sleeved outside the internal connecting tube 412 and is slidable relative to the internal connecting tube 412, so that the second locking member 270 has a third position and a fourth position on the internal connecting tube 412. Specifically, the second locking member 270 is provided with a limiting portion 271. The limiting portion 271 is configured to limit rotation of the second locking member 270 relative to the internal connecting tube 412. Atube wall of the internal connecting tube 412 is provided with a strip hole 4121. The limiting portion 271 may be, for example, a protruding strip formed on or detachably connected to the second locking member 270. The protruding strip runs through the strip hole 4121 to extend into the internal connecting tube 412. In this way, when one of the internal connecting tube 412 and the second locking member 270 rotates, another of the internal connecting tube 412 and the second locking member 270 rotates accordingly without affecting the sliding of the second locking member 270 on the internal connecting tube 412. As shown in FIGS. 45 and 46, the second locking member 270 is further provided with a locking portion 272, the external connecting tube 413 is provided with a second fitting portion 4131. The second fitting portion 4131 is configured to be in locking fitwith the locking portion 272. Specifically, when the second locking member 270 is in the third position (see FIG. 45), the locking portion 272 is in locking fit with the second fitting portion 4131, and the internal connecting tube 412 and the external connecting tube 413 are relatively fixed. When the second locking member 270 is in the fourth position (see FIG. 46), the locking portion 272 is separated from the second fitting portion 4131, and the internal connecting tube 412 and the external connecting tube 413 is rotatable relative to each other. It is to be noted that one of the locking portion 272 and the second fitting portion 4131 is a locking protrusion, another of the locking portion 272 and the second fitting portion 4131 is a locking recess; and the locking recess is in concave-convex fit with the locking protrusion to achieve relative fixation between the second locking member 270 and the external connecting tube 413.

[0178] Referring to FIGS. 43 and 44, in another embodiment, the base assembly 20 further includes a third unlocking mechanism 370. The third unlocking mechanism 370 is operably connected to the second locking member 270 and configured to drive the second locking member 270 to move from the third position to the fourth position. In this way, the user can directly control the position of the second locking member 270 through the third unlocking mechanism 370. Specifically, as shown in FIGS. 43 to 46, the third unlocking mechanism 370 includes a driving wheel 371, a third operating member 372, and a third traction component 373. More specifically, the second locking member 270 is provided with a tooth slot 273. The driving wheel 371 is rotatably arranged in the base assembly 20 and provided with meshing teeth 3711. The driving wheel 371 meshes with the tooth slot 273 through the meshing teeth 3711 to drive the second locking member 270 to move. The third operating member 372 is slidably arranged on the base assembly 20. The third traction component 373 is connected between the third operating member 372 and the driving wheel 371. When the third operating member 372 is operated, the third operating member 372 can drive the driving wheel 371 to rotate through the third traction component 373, to drive the second locking member 270 to move from the third position to the fourth position.

[0179] As shown in FIGS. 43 to 46, in another embodiment, the third traction component 373 includes a third traction rope 3731 and a third traction sleeve 3732 movably sleeved outside the third traction rope 3731. The third traction sleeve 3732 is a bendable wire sleeve and has a first sleeve end 37321 and a second sleeve end 37322. The third traction rope 3731 has a firstrope end 37311 adjacent to the first sleeve end 37321 and a second rope end 37312 adjacent to the second sleeve end 37322. The first rope end 37311 of the third traction rope 3731 is connected to the driving wheel 371, and the second rope end 37312 of the third traction rope 3731 is connected to the base assembly 20. The first sleeve end 37321 of the third traction sleeve 3732 is connected to the base assembly 20, and the second sleeve end 37322 of the third traction sleeve 3732 is connected to the third operating member 372. When the third operating member 372 is operated, the third traction sleeve 3732 is deformed to cause the third traction rope 3731 to pull the driving wheel 371 to rotate, thereby driving the second locking member 270 to move from the third position to the fourth position.

[0180] It is to be noted that the third traction sleeve 3732 has the same configuration as that of the first traction sleeve 2442, and both the third traction sleeve 3732 and the first traction sleeve 2442 are bendable wire sleeves.

[0181] Referring to FIGS. 43 to 46, in another embodiment, the first base 201 generally has a T-shaped structure, and the driving wheel 371 is rotatably arranged in a vertical part of the T-shaped structure. The external connecting tube 413 is fixedly arranged in a horizontal part of the T-shaped structure, and the third operating member 372 is movable in the left-right direction (i.e., the second direction F2) on the horizontal part of the T-shaped structure. When the second locking member 270 is required to switch from the third position to the fourth position, the third operating member 372 is pushed towards an inner side of the base assembly 20 in the second direction F2, and then the third operating member 372 drives the second sleeve end 37322 to move, and at the same time, the second traction sleeve 3122 is pressed and bent, so that the third traction rope 3731 is bent along with the third traction sleeve 3732. Since the second rope end 37312 of the third traction rope 3731 is fixed, when the third traction rope 3731 is bent, a distance between the first rope end 37311 and the second rope end 37312 is shortened, causing the first rope end 37311 to move towards the first sleeve end 37321, to drive the driving wheel 371 to rotate. In other words, when the third operating member 372 is pushed towards the inner side of the base assembly 20 in the second direction, the third operating member 372 drives the second sleeve end 37322 to move, and a length of a section L3 of the third traction rope 3731 between the second sleeve end 37322 and the second rope end 37312 is increased (see FIGS. 44 to 46). In this case, under a transmission effect of the third tractionsleeve 3732, a length of a section L4 of the third traction rope 3731 between the first rope end 37311 and the first sleeve end 37321 is decreased (see FIGS. 44 to 46). The first rope end 37311 pulls the driving wheel 371 to rotate, so that the second locking member 270 switches from the third position to the fourth position.

[0182] Optionally, in this embodiment, the internal connecting tube 412 may include two short segment bodies that are detachably connected to each other. In other embodiments, the internal connecting tube 412 may also be a complete internal connecting tube 412, that is, one long segment body.

[0183] Still referring to FIGS. 43 to 46, in another embodiment, two external connecting tubes 413 are provided. The two external connecting tubes 413 are spaced apart in a length direction of the internal connecting tube 412. Two second locking members 270 are provided. The two second locking members 270 are located between the two external connecting tubes 413 and respectively correspond to the two external connecting tubes 413. Two third unlocking mechanisms 370 are provided and are respectively operably connected to the second locking members 270. Specifically, two driving wheels 371 in the two third unlocking mechanisms 370 mesh with each other. Therefore, one of the two driving wheels 371, when rotating, may drive another of the two driving wheels 371 to rotate, so that the two second locking members 270 may be moved at the same time. In this way, the user can manipulate any of the third operating members 372 to change positions of the two second locking members 270 at the same time.

[0184] As shown in FIGS. 43 to 46, in another embodiment, to enable the second locking member 270 to be automatically reset, that is, automatically move from the fourth position to the third position, the base assembly 20 further includes an eighth reset member 380. The two second locking members 270 are spaced apart, and the eighth reset member 380 abuts against and is between the two second locking members 270 to provide an elastic restoring force for the two second locking members 270, to hold the two second locking members 270 in the third position.

[0185] A switching process of the first connection mechanism 40 between the unfolded state and the folded state according to another embodiment of the present application will be described below with reference to FIGS. 43 to 46.

[0186] When the first connection mechanism 40 remains in the unfolded state, the secondlocking member 270 is in the third position. In this case, the locking portion 272 of the second locking member 270 is engaged with the second fitting portion 4131 on the external connecting tube 413 (see FIGS. 43 and 45), and the internal connecting tube 412 and the external connecting tube 413 remain relatively fixed.

[0187] When the first connection mechanism 40 is required to switch from the unfolded state to the folded state, the user may directly push any third operating member 372 towards the inner side, for example, push the third operating member 372 on the left side towards the inner side, then, the third operating member 372 moves rightward in the left-right direction (i.e., the second direction F2); and under the transmission effect of the third traction rope 3731 and the third traction sleeve 3732, the driving wheel 371 on the left side may be rotated counterclockwise. Since the driving wheel 371 meshes with the tooth slot 273 on the second locking member 270, when the driving wheel 371 on the left side rotates counterclockwise, the second locking member 270 on the left side may be driven to move rightward, so that the locking portion 272 of the second locking member 270 is separated from the second fitting portion 4131 on the external connecting tube 413 (see FIG. 46). After the locking portion 272 is separated from the second fitting portion 4131, the rotation of the internal connecting tube 412 is not limited, and the user can hold the connecting plug 420 to drive the internal connecting tube 412 to rotate around the rotation axis X-X. It is to be noted that since the two driving wheels 371 mesh with each other, when the driving wheel 371 on the left side rotates counterclockwise, the driving wheel 371 on the right side may rotate clockwise. In this way, the second locking member 270 on the right side can be driven to move leftward, so that the locking portion 272 of the second locking member 270 is separated from the second fitting portion 4131 on the corresponding external connecting tube 413.

[0188] After the first connection mechanism 40 switches to the folded state, the second fitting portion 4131 on the external connecting tube 413 is aligned again with the locking portion 272 of the second locking member 270. Since the eighth reset member 380 is provided between the two second locking members 270, after the user releases the third operating member 372, the second locking member 270 on the left side moves leftward, and the second locking member 270 on the right side moves rightward. In this way, the locking portions 272 of the two second locking members 270 may be in concave-convex engagement again with thesecond fitting portions 4131 on the external connecting tube 413 respectively, so that the rotation of the two second locking members 270 and the rotation of the internal connecting tube 412 are limited, and the first connection mechanism 40 is kept in the folded state.

[0189] Similarly, when the first connection mechanism 40 is required to switch from the folded state to the unfolded state, an operating principle thereof is the same as that when the first connection mechanism 40 switches from the unfolded state to the folded state, except that an operating process thereof is the opposite of that described above. Details thereof are not described herein.

[0190] Referring to FIG. 47, in yet another embodiment, both the second locking member 270 and the third unlocking mechanism 370 may be omitted. In this case, the internal connecting tube 412 can rotate freely relative to the external connecting tube 413. When the first connection mechanism 40 can freely switch from the folded state and the unfolded state, after the connection structure 200 connects the infant safety carrier to the car seat 2000, if the car accelerates rapidly, the infant safety carrier and the base assembly 20 have a tendency to tilt backward clockwise relative to the seat 2000 under an inertial force. To prevent the above problems, referring to FIGS. 48 to 51, the connection structure 200 further includes an abutting rod member 60. The abutting rod member 60 is configured to abut against the backrest portion of the car seat 2000. Optionally, the abutting rod member 60 may be directly arranged on the base assembly 20 (for example, on the first base 201). Alternatively, the abutting rod member 60 may extend through the base assembly 20 and be connected to the external connecting tube 413. Alternatively, the abutting rod member 60 may extend through the base assembly 20 and the external connecting tube 413 and be connected to the internal connecting tube. Since an angle between the abutting rod member 60 and the base assembly 20 remains fixed, after the abutting rod member 60 abuts against the backrest portion, the base assembly 20 cannot tilt backward relative to the car seat 2000. In this way, stability of the infant safety carrier after being mounted can be improved.

[0191] It is to be noted that the abutting rod member 60 may be fixedly mounted on the base assembly 20 or the external connecting tube 413 or the internal connecting tube 412. In other embodiments, the abutting rod member 60 may be pivotally connected to the base assembly 20 or the external connecting tube 413 or the internal connecting tube 412. When theabutting rod member 60 may pivot relative to the base assembly 20 or the external connecting tube 413 or the internal connecting tube 412, the base assembly 20 further includes another locking mechanism configured to lock the abutting rod member 60. In another embodiment, the abutting rod member 60 may also be detachably connected to the base assembly 20 or the external connecting tube 413 or the internal connecting tube 412.

[0192] As shown in FIG. 49, in another embodiment where the base assembly 20 has the second locking member 270 and the third unlocking mechanism 370, the connection structure 200 may still include the abutting rod member 60. That is, the base assembly 20 is still provided with the abutting rod member 60. Compared with a situation where the abutting rod member 60 is not provided, after the abutting rod member 60 is provided, an abutting area between the infant safety carrier and the backrest portion is indirectly increased. In this way, the stability of the infant safety carrier after being mounted can be further improved. It is to be noted that, when the connection structure 200 includes the abutting rod member 60, that is, when the base assembly 20 is provided with the abutting rod member 60, the abutting member 106 at the front end of the carrier body 100 may be omitted.

[0193] Referring to FIG. 52, in some embodiments where the abutting rod member 60 is provided, the connection structure 200 further includes a tether strap 70. The tether strap 70 includes a fixing portion 710 and a connecting portion 720. The fixing portion 710 is connected to the abutting rod member 60. The connecting portion 720 is configured to be connected to an anchor point of the car seat 2000. In this way, stability of fixation of the connection structure 200 and the infant safety carrier to the car seat 2000 can be ensured, to prevent the frontward and backward and / or leftward and rightward sliding thereof. Specifically, the fixing portion 710 and / or the connecting portion 720 are / is provided with a connecting member 730, such as a hook, a collar, and other components. In this way, convenience and stability of connection can be improved. More specifically, the tether strap 70 is provided with an adjuster 80. The adjuster 80 is configured to adjust an available length of the tether strap 70.

[0194] Referring to FIGS. 53 and 54, the abutting rod member 60 is provided with a through portion 601. After the tether strap 70 extends through the through portion 601, the fixing portion 710 thereof is configured to be connected to a connecting buckle 107 of the infant safety carrier, and the connecting portion 720 is still configured to be connected to theanchor point of the car seat 2000. Specifically, in this embodiment, the tether strap 70 has a Y- shaped structure. That is, the tether strap has two branches extending outward from one end of the connecting portion 720 such that two fixing portions 710 may be provided. The two fixing portions 710 drive the two branches to surround the infant safety carrier, that is, the two branches are connected to the connecting buckle 107 on the back of the infant safety carrier in a "wrap-around" manner. As shown in FIGS. 4 and 6, in an embodiment, the first base 201 generally has a T-shaped structure, the second base 202 generally has a rectangular structure. A width of the second base 202 in the left-right direction may be regarded as a width W1 of the second connection mechanism 50. As shown in FIGS. 38 and 39, in another embodiment, the second base 202 may generally also have a T-shaped structure. Specifically, the vertical part of the T-shaped structure of the first base 201 and the vertical part of the T-shaped structure of the second base 202 are connected to each other. In this way, an empty groove 205 with an opening at one end can be formed on either side of the base assembly 20. Referring to FIGS. 45 and 46, since the plug connection component 410 is arranged on the horizontal part of the T-shaped structure of the first base 201, specifically, the external connecting tube 413 is fixedly mounted on the horizontal part of the first base 201, and the internal connecting tube 412 is rotatably mounted on the horizontal part of the first base 201, and an end portion of the internal connecting tube 412 is connected to the connecting plug 420, so when the internal connecting tube 412 rotates to cause the first connection mechanism 40 to be in the folded state, at least part of the connecting plug 420 covers the opening of the empty groove 205 (see FIG. 39). In this way, it is convenient for the user to reach into the empty groove 205 to hold the horizontal part of the T-shaped structure of the first base 201 or the connecting plug 420, thereby improving portability of the connection structure 200.

[0195] Referring to FIGS. 55 to 58, in another embodiment, a bottom surface of the second base 202 is arranged obliquely with respect to a bottom surface of the first base 201, that is, the first lower shell 20 IB and the second lower shell 202B are arranged at an angle to each other, so that, when the infant safety carrier is engaged with the second connection mechanism 50, the bottom surface of the first base 201 is not in contact with the car seat 2000. As shown in FIGS. 36 and 37, when the base assembly 20 is connected to the car seat 2000 through the first connection mechanism 40 (i.e., the connecting plug 420), an opening of an angle a2 betweenthe first lower shell 20 IB and the second lower shell 202B faces a seat portion of the car seat 2000, and the first lower shell 20 IB and part of the second lower shell 202B (that is, other than a part at an end of the second lower shell 202B away from the first lower shell 20 IB) are suspended in the air and are not in contact with the seat portion. In this way, a movable space can be provided to turn the connecting plug 420 and the base assembly 20 relative to each other.

[0196] Referring to FIGS. 3 and 5 or FIGS. 33 and 34, in some of the above embodiments, the bottom of the mounting rib 104 of the carrier body 100 has an arc-shaped structure. In this way, when the infant safety carrier is placed on the horizontal plane, the user can shake the infant safety carrier by pressing the end portion of the infant safety carrier in the up-down direction to comfort the infant lying in the infant safety carrier. Specifically, the front engaging member 101 may be arranged in a region between a front end of the arc-shaped structure, and a middle portion in a circumferential direction of the arc-shaped structure. When the front engaging member 101 is connected to the second connection mechanism 50, the base assembly 20 (for example, the receiving groove 204) may support a front-end region of the arc-shaped structure. In this way, when the infant safety carrier is connected to the car seat 2000 through the connection structure 200, a support area of the seat portion of the car seat 2000 for the mounting rib 104 (bottom of the infant safety carrier) is indirectly increased, so that the infant safety carrier is less likely to shake in the front-rear direction.

[0197] Currently, the seat portion of the car seat 2000 may be roughly divided into two situations. One is that the seat portion is parallel to the horizontal plane, that is, the seat surface thereof is parallel to the horizontal plane (see FIGS. 36 or 50). The other is that the seat portion is inclined relative to the horizontal plane, that is, the seat surface thereof is inclined relative to the horizontal plane (see FIGS. 37 or 51). Since the connecting plug 420 may rotate with the internal connecting tube 412, for car seats 2000 with different seat surfaces, an angle a3 between the connecting plug 420 and the base assembly 20 may be changed by rotating the base assembly 20 or the connecting plug 420, so that the infant safety carrier can adapt to different car seats 2000. Specifically, as shown in FIG. 36, when the seat surface is in the horizontal state, the infant safety carrier is fixed to the car seat 2000 through the connection structure 200. In this case, the angle a3 between the connecting plug 420 and the base assembly 20 is approximately 180°, and there is no need to turn the connecting plug 420 and the baseassembly 20 relative to each other. As shown in FIG. 37, when the seat surface is in the inclined state, in order to ensure that the infant safety carrier can be directly supported on the seat surface, the base assembly 20 is required to be turned so that the angle a3 between the connecting plug420 and the base assembly 20 is approximately an obtuse angle. Further, the angle a3 between the connecting plug 420 and the first base 201 may also be adaptively adjusted according to different inclination angles of the seat surfaces, which can improve adaptability of the connection structure 200 to different car seats 2000. In addition, the manner of rotating the internal connecting tube 412 to change the angle a3 between the connecting plug 420 and the base assembly 20 may also be used to adjust the inclination angle of the infant safety carrier relative to the seat surface, which can adjust a pitch angle of the infant safety carrier relative to the car seat 2000, thereby changing a state (for example, sitting posture or lying-flat posture) of the infant in the infant safety carrier relative to the car seat 2000.

[0198] The connecting plug 420 is, for example, an ISOFIX plug or another suitable plug. Specifically, as shown in FIGS. 26 and 27, in an embodiment, the connecting plug 420 is an ISOFIX plug. The connecting plug 420 may include a housing 421, a locking hook 422, and a locking member 423. A cavity 4211 is formed in the housing 421, and an end of the housing421 away from the plug connection component 410 has a locking groove 4212. The locking groove 4212 is configured to accommodate an engaging rod (not shown) on the car seat 2000. A groove wall of the locking groove 4212 is provided with a through hole. The through hole is in communication with the locking groove 4212 and the cavity 4211. The locking hook 422 is located in the cavity 4211 and pivotally connected to the housing 421, so that the locking hook422 has a locked position and an unlocked position. Specifically, when the locking hook 422 is in the locked position (see FIG. 26), the locking hook 422 at least partially blocks an opening of the locking groove 4212, to lock and limit the engaging rod to achieve the connection between the first connection mechanism 40 and the car seat 2000. When the locking hook 422 is in the unlocked position (see FIG. 27), the opening of the locking groove 4212 is opened, and the engaging rod can be separated from the locking hook 422. More specifically, the locking member 423 is located in the cavity 4211 and may slide relative to the locking hook 422 to approach the locking hook 422 or be away from the locking hook 422. One of the locking hook 422 and a side of the locking member 423 facing the locking hook 422 is provided withan engaging groove4221, and another of the locking hook 422 and the side of the locking member 423 facing the locking hook 422 is provided with an engaging block 4231. When the locking hook 422 is in the locked position, the engaging block 4231 is engaged in the engaging groove 4221 to hold the locking hook 422 in the locked position. When the engaging block 4231 withdraws from the engaging groove 4221, the locking hook 422 can pivot to enable the locking hook 422 to switch to the unlocked position. Further, a seventh reset member (not shown) is provided in the cavity 4211. The seventh reset member is, for example, a torsion spring. The seventh reset member abuts against the locking hook 422 and is adapted to bias the locking hook 422 to rotate towards the unlocked position. Therefore, after the engaging block 4231 withdraws from the engaging groove 4221, the locking hook 422 automatically switches to the unlocked position under the action of the seventh reset member, so that the unlocking can be performed conveniently and smoothly, and the problem of deadlock of the locking hook 422 is unlikely to occur.

[0199] Referring to FIGS. 28 and 29, in an embodiment, the second connection mechanism 50 includes an engaging hook 510 and a limiting groove 520 disposed in the base assembly 20. The limiting groove 520 is configured to accommodate the front engaging member 101 of the carrier body 100. The engaging hook 510 is pivotally connected to the base assembly 20 and has a locked position and an unlocked position. When the engaging hook 510 is in the locked position, the engaging hook 510 at least partially extends into an opening of the limiting groove 520 (see FIG. 28), to lock and limit the front engaging member 101. When the engaging hook 510 is in the unlocked position, the opening of the limiting groove 520 is opened (see FIG. 29), and the front engaging member 101 may be separated from the engaging hook 510. When the front engaging member 101 is engaged with the limiting groove 520, edges at two sides of the top of the limiting groove 520, that is, an upper surface of the base assembly 20, abut against a lower surface of the carrier body 100 to prevent pivoting of the carrier body 100 relative to the base assembly 20.

[0200] Referring to FIGS. 28 and 29, in an embodiment, a groove wall of the limiting groove 520 is provided with a perforation (not shown). The perforation is in communication with the accommodating cavity 203 with the limiting groove 520. Specifically, the engaging hook 510 is provided with an accommodating groove 511 matching the front engaging member101. The accommodating groove 511 is U-shaped, and two opposite sidewalls of the accommodating groove 511 form a locking wall surface 5111 and a pushing wall surface 5112 respectively (see FIG. 30). The pushing wall surface 5112 is adapted to be pushed by the front engaging member 101 to drive the engaging hook 510 to pivot from the unlocked position to the locked position. Part of the engaging hook 510 is accommodated in the accommodating cavity 203 and pivotally connected to a sidewall of the accommodating cavity 203 through a pivot shaft 530. Specifically, in this embodiment, the engaging hook 510 is pivotally connected to the sliding frame 220 through the pivot shaft (see FIGS. 8 and 9), and the sliding frame 220 is provided with an engaging slot 224 (see FIGS. 12 and 13). The sidewall of the limiting groove 520 in the accommodating cavity 203 forms an engaging portion 2023 (see FIGS. 10 and 29). A shape of the engaging slot 224 matches the engaging portion 2023, so that the engaging portion 2023 is engaged with the engaging slot 224. More specifically, when the engaging hook 510 is in the locked position, the locking wall surface 5111 is located in the limiting groove 520 and blocks the opening of the limiting groove 520. When the engaging hook 510 is in the unlocked position, the pushing wall surface 5112 is located in the limiting groove 520, and the locking wall surface 5111 is located in the accommodating cavity 203.

[0201] In an embodiment, as shown in FIG. 28, when the engaging hook 510 is in the locked position, the front engaging member 101 abuts against the pushing wall surface 5112, and a gap is formed between the locking wall surface 5111 and the front engaging member 101. In this way, when the engaging hook 510 pivots around the pivot shaft 530 to switch the engaging hook 510 to the unlocked position, it is convenient for the front engaging member 101 to be disengaged from the engaging hook 510.

[0202] In an embodiment, the base assembly 20 further includes a locking retention mechanism 290. As shown in FIGS. 8, 9, 28, and 29, the locking retention mechanism 290 is movably arranged in the accommodating cavity 203. When the engaging hook 510 is driven to the locked position, the locking retention mechanism 290 is configured to lock the engaging hook 510 in the locked position.

[0203] Referring to FIGS. 8 and 9, in an embodiment, the locking retention mechanism 290 may include a limiting member 291. The limiting member 291 is movably arranged in the accommodating cavity 203 and has a fifth position and a sixth position. Specifically, thelimiting member 291 is pivotally connected to a bottom wall of the base assembly 20 at a first pivot point QI. One of the limiting member 291 and the engaging hook 510 is provided with a locking concave 513, and another of the limiting member 291 and the engaging hook 510 is provided with a first fitting portion 2911. In other words, when the limiting member 291 is provided with the locking concave 513, the engaging hook 510 is provided with the first fitting portion 2911; or when the engaging hook 510 is provided with the locking concave 513, the limiting member 291 is provided with the first fitting portion 2911. Specifically, in this embodiment, the engaging hook 510 is provided with the locking concave 513, the locking concave 513 is a locking notch. The limiting member 291 is provided with the first fitting portion 2911, and the first fitting portion 2911 is a convex portion. More specifically, when the limiting member 291 is in the fifth position, the locking concave 513 is in concave-convex fit with the first fitting portion 2911 to lock the engaging hook 510 in the locked position. When the limiting member 291 is in the sixth position, the locking concave 513 is separated from the first fitting portion 2911 and the engaging hook 510 is in the unlocked position.

[0204] Still referring to FIGS. 8 and 9, in an embodiment, the locking retention mechanism 290 further includes a fifth reset member 292. The fifth reset member 292 provides an elastic restoring force for the limiting member 291 to drive the limiting member 291 to switch to the fifth position. The fifth reset member 292 is, for example, a spring. In this way, when the engaging hook 510 pivots from the unlocked position to the locked position, under the action of the fifth reset member 292, the limiting member 291 can automatically switch to the fifth position, so that the first fitting portion 2911 of the limiting member 291 extends into the locking concave 513 of the engaging hook 510 to lock the engaging hook 510, and the engaging hook 510 is held in the locked position.

[0205] Further, referring to FIGS. 8 to 10, in an embodiment, the second connection mechanism 50 further includes a sixth reset member 330. The sixth reset member 330 abuts against the engaging hook 510 and is configured to hold the engaging hook 510 in the unlocked position. The sixth reset member 330 is, for example, a torsion spring. The torsion spring is sleeved on the pivot shaft 530 and abuts against the engaging hook 510. In this way, when the first fitting portion 2911 withdraws from the locking concave 513, the engaging hook 510 can automatically rotate around the pivot shaft 530 to be in the unlocked position, so that theunlocking is performed conveniently and smoothly, and the problem of deadlock of the engaging hook 510 is unlikely to occur.

[0206] Locking and unlocking principles of the engaging hook 510 according to an embodiment of the present application are described below with reference to FIGS. 8, 9, 28, and 29.

[0207] Referring to FIGS. 9 and 29, when the carrier body 100 is not mounted on the base assembly 20, the engaging hook 510 is held in the unlocked position under the action of the sixth reset member 330. At the same time, the limiting member 291 is in the sixth position, and the first fitting portion 2911 withdraws from the locking concave 513.

[0208] Still referring to FIGS. 9 and 29, when the carrier body 100 is required to be mounted on the base assembly 20, that is, the front engaging member 101 is required to be connected to the second connection mechanism 50, the user may first place the front engaging member 101 in the limiting groove 520 and cause the front engaging member 101 to abut against the pushing wall surface 5112. Then, the front engaging member 101 is pushed downward to drive the engaging hook 510 to rotate clockwise around the pivot shaft 530 until the pushing wall surface 5112 withdraws from the limiting groove 520, and the locking wall surfaces 5111 extends into the limiting groove 520 to block the opening of the limiting groove 520. At the same time, the engaging hook 510 rotates to cause the locking concave 513 to face the first fitting portion 2911, and the fifth reset member 292 drives the first fitting portion 2911 to move to extend into the locking concave 513, and finally, the engaging hook 510 is held in the locked position, thereby achieving a stable connection between the engaging hook 510 and the front engaging member 101.

[0209] Referring to FIGS. 8 and 28, when the carrier body 100 is required to be separated from the base assembly 20, that is, the front engaging member 101 is required to be separated from the second connection mechanism 50, the user may move the limiting member 291 from the fifth position to the sixth position. In this process, the first fitting portion 2911 gradually withdraws from the locking concave 513. When the first fitting portion 2911 completely withdraws from the locking concave 513, under the action of the sixth reset member 330, the engaging hook 510 automatically rotates counterclockwise around the pivot shaft 530, and the locking wall surface 5111 withdraws from the limiting groove 520, so that the opening of thelimiting groove 520 is opened.

[0210] In an embodiment, as shown in FIGS. 29 and 30, a pushing bump 512 is provided in the accommodating groove 511. The pushing bump 512 is arranged on the pushing wall surface 5112 and located on a movement path of the front engaging member 101 on the pushing wall surface 5112. The pushing bump 512 is adapted to be pushed by the front engaging member 101 to enable the engaging hook 510 to pivot to the locked position. Specifically, when the engaging hook 510 is required to switch from the unlocked position to the locked position, the user may push the pushing wall surface 5112 downward through the front engaging member 101. During the downward pressing, the engaging hook 510 pivots, and the front engaging member 101 gradually moves from the pushing wall surface 5112 towards the bottom of the U-shaped accommodating groove 511. At the same time, the locking concave 513 on the engaging hook 510 gradually approaches the first fitting portion 2911 of the limiting member 291. Since the pushing bump 512 is arranged on the movement path of the front engaging member 101 on the pushing wall surface 5112 and protrudes from the pushing wall surface 5112, so the front engaging member 101, when passing over the pushing bump 512, can drive the engaging hook 510 to further pivot, so that the first fitting portion 2911 can be fully inserted into the locking concave 513 when the front engaging member 101 moves to the bottom of the accommodating groove 511. A width of the locking concave 513 is greater than that of the first fitting portion 2911. When the front engaging member 101 is at the top of the pushing bump 512, a middle portion of the locking concave 513 faces the first fitting portion 2911, so that the first fitting portion 2911 can be inserted into the bottom of the locking concave 513 without contacting a sidewall of the locking concave 513. When the front engaging member 101 passes over the top of the pushing bump 512 and reaches an engaged position, the locking concave 513 pivots relative to the first fitting portion 2911, and the sidewall of the locking concave 513 abuts against the first fitting portion 2911, so that the locking concave 513 and the first fitting portion 2911 are tightly engaged with each other. More specifically, when the engaging hook 510 is in the locked position, the pushing bump 512 is in interference fit with the front engaging member 101.

[0211] To facilitate the user to manipulate the limiting member 291 to cause the engaging hook 510 to be in the unlocked position, in an embodiment, as shown in FIGS. 8 and 9, thebase assembly 20 further includes a second unlocking mechanism 310. The second unlocking mechanism 310 is operably connected to the limiting member 291 and configured to drive the limiting member 291 to move from the fifth position to the sixth position. In this way, the user can switch the limiting member 291 from the fifth position to the sixth position by manipulating the second unlocking mechanism 310.

[0212] Referring to FIGS. 8 and 9, in an embodiment, the second unlocking mechanism 310 includes a second operating member 311 and a second traction component 312. The second operating member 311 is slidably arranged on the base assembly 20 and has a seventh position and an eighth position. The second traction component 312 is connected between the second operating member 311 and the limiting member 291. When the second operating member 311 is in the seventh position, the limiting member 291 is in the fifth position. In this case, the first fitting portion 2911 of the limiting member 291 extends into the locking concave of the engaging hook 510 to hold the engaging hook 510 in the locked position. When the second operating member 311 is in the eighth position, the limiting member 291 is in the sixth position. In this case, the first fitting portion 2911 of the limiting member 291 is separated from the locking concave of the engaging hook 510 to enable the engaging hook 510 to switch to the unlocked position.

[0213] Still referring to FIGS. 8 and 9, specifically, in this embodiment, the second traction component 312 includes a second traction rope 3121 and a second traction sleeve 3122 movably sleeved outside the second traction rope 3121. The second traction sleeve 3122 has a first sleeve end 31221 and a second sleeve end 31222 (see FIG. 6). The second traction rope 3121 has a first rope end 31211 adjacent to the first sleeve end 31221 and a second rope end (not shown) adjacent to the second sleeve end 31222. More specifically, the first rope end 31211 of the second traction rope 3121 is connected to the limiting member 291, and the second rope end of the second traction rope 3121 is connected to the base assembly 20. The first sleeve end 31221 of the second traction sleeve 3122 is connected to the base assembly 20, and the second sleeve end 31222 of the second traction sleeve 3122 is connected to the second operating member 311. Specifically, the second operating member 311 is provided with a second fixed portion 3113 (see FIGS. 23 and 31). The second fixed portion 3113 is configured to be connected to the second sleeve end 31222 of the second traction sleeve 3122. When thesecond operating member 311 switches from the seventh position to the eighth position, the second traction sleeve 3122 is deformed so that the second traction rope 3121 pulls the limiting member 291 to switch from the fifth position to the sixth position.

[0214] It is to be noted that the second traction sleeve 3122 has the same configuration as that of the first traction sleeve 2442, and both the second traction sleeve 3122 and the first traction sleeve 2442 are bendable wire sleeves.

[0215] Referring to FIGS. 8, 9, and 23, in this embodiment, the base assembly 20 is generally T-shaped. The limiting member 291 slides within the vertical part of the T-shaped base assembly 20. The second operating member 311 moves on the horizontal part of the T- shaped base assembly 20. Correspondingly, the second traction rope 3121 and the second traction sleeve 3122 are bent in the base assembly 20 so that the first rope end 31211 is connected to the limiting member 291 and the first sleeve end 31221 is connected to the vertical part of the base assembly 20. The second rope end is connected to the horizontal part of the base assembly 20, and the second sleeve end 31222 is connected to the second operating member 311. More specifically, the second operating member 311 moves in the left-right direction (i.e., the second direction F2) on the horizontal part of the T-shaped base assembly 20. When the limiting member 291 is required to switch from the fifth position to the sixth position, the second operating member 311 is pushed towards the inner side of the base assembly 20 in the second direction F2, the second operating member 311 drives the second sleeve end 31222 to move, and at the same time, the second traction sleeve 3122 is pressed and bent, so that the second traction rope 3121 is bent along with the second traction sleeve 3122. Since the second rope end of the second traction rope 3121 is fixed, when the second traction rope 3121 is bent, a distance between the first rope end 31211 and the second rope end is shortened, causing the first rope end 31211 to move towards the first sleeve end 31221, that is, the first rope end 31211 moves forward in the front-rear direction). In other words, when the second operating member 311 is pushed towards the inner side of the base assembly 20 in the second direction F2, the second operating member 311 drives the second sleeve end 31222 to move, and a length of a section L2 of the second traction rope 3121 between the second sleeve end 31222 and the second rope end is increased (see FIG. 23). At the same time, under a transmission effect of the second traction sleeve 3122, a length of a section LI of the secondtraction rope 3121 between the first rope end 31211 and the first sleeve end 31221 is decreased (see FIGS. 8 and 9), and the first rope end 31211 pulls the limiting member 291 to pivot, so that the limiting member 291 switches from the fifth position to the sixth position.

[0216] Referring to FIG. 5, generally, after the carrier body 100 is connected to the base assembly 20 through the second connection mechanism 50, a gap between the carrier body 100 and the base assembly 20 is small. In this embodiment, convenience of unlocking can be improved by pushing the second operating member 311 inward. In other words, the problem of inconvenient unlocking due to the small gap between the carrier body 100 and the base assembly 20 after the carrier body 100 is mounted to the base assembly 20 can be solved by pushing the second operating member 311 inward. Specifically, in this embodiment, referring to FIGS. 5, 22, and 31, the second operating member 311 has a pushing portion 3112. The pushing portion 3112 protrudes from a sliding plane of the second operating member 311 on the base assembly 20. When manipulating the second operating member 311, the user only needs to push the pushing portion 3112 with finger.

[0217] Certainly, in other embodiments, the second traction component 312 may include only the second traction rope 3121. The first rope end 31211 of the second traction rope 3121 is connected to the limiting member 291, and the second rope end of the second traction rope 3121 is connected to the second operating member 311. In this case, when the limiting member 291 is required to switch from the fifth position to the sixth position, the second operating member 311 may be pulled towards an outer side of the base assembly 20 in the second direction F2 to drive the limiting member 291 to rotate to cause the first fitting portion 2911 to withdraw from the locking concave 513.

[0218] Referring to FIGS. 6, 8, and 23, in an embodiment, the second unlocking mechanism 310 further includes a fourth reset member 320. The fourth reset member 320 provides an elastic restoring force for the second operating member 311 to hold the second operating member 311 in the seventh position.

[0219] In an embodiment, as shown in FIG. 6, the base assembly 20 has an unlock indication region 340. The unlock indication region 340 indicates, according to a relative position between the second operating member 311 and the base assembly 200, that the first locking member 230 is in the locked position or the unlocked position. The unlock indicationregion 340 is, for example, two color blocks located on the base assembly 20 (for example, a green block and a red block). The second operating member 311 is provided with an observation hole 3111 (see FIGS. 7 and 32) used to observe the unlock indication region 340. When the second operating member 311 slides on the base assembly 20, the observation hole 3111 can switch between the two color blocks. Therefore, the user can determine, through a color displayed in the observation hole 3111, whether the first locking member 230 is in the locked position or the unlocked position. More specifically, in this embodiment, when the first locking member 230 is in the locked position, the color block displayed in the observation hole 3111 is green; and when the first locking member 230 is in the unlocked position, the color block displayed in the observation hole 3111 is red. More specifically, the red block is closer to the outer side of the base assembly 20 than the green block.

[0220] Referring to FIGS. 8 and 9, in an embodiment, the second connection mechanism 50 includes two engaging hooks 510. The two engaging hooks 510 are spaced apart in an extending direction of the limiting groove 520. Specifically, the limiting groove 520 extends in the first direction Fl. The locking retention mechanism 290 includes two limiting members 291 respectively corresponding to the two engaging hooks 510. Each limiting member 291 is pivotally connected to the base assembly 20, and the two limiting members 291 are pivotally connected to each other. Specifically, the two limiting members 291 are pivotally connected at a second pivot point Q2. Correspondingly, the base assembly 20 is provided with two second operating members 311 and two second traction components 312. The two second operating members 311 are respectively slidably arranged at two ends of the horizontal part of the T- shaped base assembly 20. The second traction component 312 is connected between the corresponding second operating member 311 and the corresponding limiting member 291. Therefore, when one of the limiting members 291 switches between the fifth position and the sixth position, another of the limiting members 291 may simultaneously switch between the fifth position and the sixth position. In other words, when one of the limiting members 291 switches from the fifth position to the sixth position, another of the limiting members 291 simultaneously switches from the fifth position to the sixth position.

[0221] Referring to FIGS. 55 to 59, another embodiment of the present application provides a second connection mechanism 50. The second connection mechanism 50 includesan engaging hook 510 and a limiting groove 520 provided on the base assembly 20. Specifically, the configuration and the position of the limiting groove 520 in this embodiment are the same as those in one of the above embodiments, and the position of the engaging hook 510 in this embodiment is the same as that in one of the above embodiments, only except that the configuration of the engaging hook 510 is slightly different. Without any conflict, the configuration of the engaging hook 510 and a connection relationship between it and other components in this embodiment may be obtained with reference to the embodiments described above, and details thereof are not described herein. Differences between this embodiment and the above embodiments (i.e., related embodiments with respect to the second connection mechanism 50) are mainly described below.

[0222] Referring to FIGS. 55 and 56, in another embodiment, the engaging hook 510 is provided with a locking tab 514, and the locking concave 513 in the above embodiments is omitted. Correspondingly, in this embodiment, another locking retention mechanism 290 is provided in the base assembly 20. The locking retention mechanism 290 is movably arranged in the accommodating cavity 203 and is configured to fit with the locking concave 513 to hold the engaging hook 510 in the locked position.

[0223] Referring to FIG. 57, the locking retention mechanism 290 includes a locking hook 293 and a ninth reset member 294. The locking hook 293 is provided with a hook portion 2931. The locking hook 293 is rotatably arranged in the accommodating cavity 203, so that the locking hook 293 has a ninth position and a tenth position. Specifically, when the locking hook 293 is in the ninth position and the engaging hook 510 is in the locked position, the hook portion 2931 is located on a rotation path of the engaging hook 510 and is engaged with and limited by the locking tab 514. When the locking hook 293 is in the tenth position, the hook portion 2931 deviates from the rotation path of the engaging hook 510 to allow the engaging hook 510 to rotate. Specifically, the ninth reset member 294 is mainly configured to provide an elastic restoring force for the locking hook 293, so as to hold the locking hook 293 in the ninth position. More specifically, the ninth reset member 294 is located at an end of the locking hook 293 away from the hook portion 2931. Optionally, the ninth reset member 294 may be a tension spring or a compression spring.

[0224] Referring to FIGS. 55 and 56, in another embodiment, a cavity wall of theaccommodating cavity 203 (that is, the second lower shell 202B) is provided with an avoidance groove 2022. The avoidance groove 2022 is located on a rotation path of the hook portion 2931. The avoidance groove 2022 can increase a rotation stroke of the locking hook 293 to ensure that the locking hook 293 can enter the avoidance groove 2022 during the rotation to cause the hook portion 2931 to be completely separated from the locking tab 514, thereby releasing the limitation on the engaging hook 510. Certainly, in other embodiments, the avoidance groove 2022 may be omitted.

[0225] Still referring to FIGS. 55 and 56, the bottom of the locking tab 514 is provided with a pushing slope 5141. The pushing slope 5141 is adapted to push against the hook portion 2931 to enable the engaging hook 510 to pivot to the locked position. Specifically, after placing the front engaging member 101 in the limiting groove 520, the user may push downward the pushing wall surface 5112 of the engaging hook 510. During the downward pressing, the engaging hook 510 pivots so that a vertex Bl of the locking tab 514 rotates to abut against the hook portion 2931 of the locking hook 293. When the vertex Bl passes over the hook portion 2931, the hook portion 2931 directly contacts the pushing slope 5141. In this process, the ninth reset member 294 continues to provide a restoring force for the locking hook 293, so that the hook portion 2931 of the locking hook 293 has a tendency of moving substantially upward. Therefore, after the hook portion 2931 contacts the pushing slope 5141, the hook portion 2931 may move upward along the pushing slope 5141 and push against the pushing slope 5141 so that the engaging hook 510 continues to pivot, thereby causing the locking wall surface 5111 of the engaging hook 510 to fully extend into the limiting groove 520.

[0226] As shown in FIGS. 57 and 58, in another embodiment, in order to facilitate the user to manipulate the locking hook 293, the locking retention mechanism 290 further includes an operating rod 295 and an operating handle 296. The operating rod 295 is mounted in the accommodating cavity 203 and is connected to the locking hook 293. An end portion of the operating rod 295 extends through the base assembly 20 (for example, the second base 202) and is connected to the operating handle 296. The operating handle 296 is operable to drive the locking hook 293 to switch from the ninth position to the tenth position. Specifically, the locking hook 293 is fixedly arranged on the operating rod 295. Therefore, when the operating handle 296 is rotated, the operating rod 295 may rotate accordingly, so that the locking hook293 can be rotated to switch between the ninth position and the tenth position. More specifically, as shown in FIGS. 55 to 59, the user may rotate the operating handle 296 clockwise. In this way, the operating rod 295 may drive the locking hook 293 to rotate clockwise to enable the hook portion 2931 to move substantially downward, to withdraw from a pivot path of the engaging hook 510 (for example, the locking tab 514). In this embodiment, the operating handle 296 is fixedly connected to the operating rod 295. For example, the operating handle 296 is engaged with the operating rod 295; or the operating handle 296 may be fixedly connected to the operating rod 295 through a connecting member 730 such as a screw. Specifically, as shown in FIG. 54, the operating handle 296 is provided with an arc-shaped slot 2961 on one side facing the base assembly 20, and an end portion of the operating lever 295 is provided with a jointing portion 2951. The jointing portion 2951 is arranged at an angle to a main body of the operating rod 295. The jointing portion 2951 is configured to be inserted into the arc-shaped slot 2961 to enable the operating rod 295 to rotate together with the operating handle 296.

[0227] Referring to FIGS. 57 and 58, the second connection mechanism 50 includes two engaging hooks 510. The two engaging hooks 510 are spaced apart in the extending direction of the limiting groove 520. Correspondingly, the locking retention mechanism 290 includes two locking hooks 293 that respectively disposed corresponding to the two engaging hooks 510. The two locking hooks 293 are both arranged on the operating rod 295. Each of two ends of the operating rod 295 are respectively connected to the operating handle 296. In this way, when one of the operating handles 296 is rotated, under a linkage action of the operating rod 295, the two locking hooks 293 can be controlled to rotate at the same time to simultaneously unlock the two engaging hooks 510.

[0228] In the connection structure and the child carrier with the connection structure according to the embodiments of the present application, since the first connection mechanism can be detachably connected to the car seat and the second connection mechanism can be detachably connected to the front engaging member of the carrier body, so when the carrier body is required to be mounted on the car seat, the carrier body may be first connected to the base assembly through the second connection mechanism, and then the base assembly is connected to the car seat through the first connection mechanism; or the base assembly may befirst connected to the car seat through the first connection mechanism, and then the carrier body is connected to the base assembly through the second connection mechanism, to achieve a connection between the carrier body and the car seat. In addition, when the carrier body is required to be carried by hands separately, the carrier body may be directly separated from the base assembly, without carrying the entire connection structure. In this way, a burden of the user when carrying the carrier body can be effectively reduced.

[0229] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features are described in the embodiments. However, as long as there is no contradiction in the combination of these technical features, the combinations should be considered as in the scope of the specification.

[0230] The above-described embodiments only illustrate several implementations of the present application, and the descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be understood by those of ordinary skill in the art that various modifications and improvements can be made without departing from the concept of the present application, and all fall within the protection scope of the present application. Therefore, the patent protection of the present application shall be defined by the appended claims.

Claims

CLAIMS1. A connection structure, configured to connect a child carrier to a car seat, the child carrier being provided with a plurality of engaging members, wherein the connection structure comprises: a base assembly; a first connection mechanism configured to be detachably connected to the car seat; and a second connection mechanism configured to be detachably connected to one of the plurality of engaging members; wherein the first connection mechanism and the second connection mechanism are connected to the base assembly; a shape of the second connection mechanism is configured to be adapted for connecting part of the plurality of engaging members; and the first connection mechanism is movably connected to the base assembly and has an unfolded state and a folded state.

2. The connection structure according to claim 1, wherein the base assembly comprises: a first base configured to be connected to the first connection mechanism; and a second base capable of sliding back and forth relative to the first base, and configured to be connected to the second connection mechanism.

3. The connection structure according to claim 2, wherein the base assembly further comprises: a fixed frame configured to be connected to the first base; a sliding frame configured to be connected to the second base and slidingly connected to the fixed frame, the sliding frame being capable of sliding back and forth relative to the fixed frame; and a first locking member, wherein one of the sliding frame and the fixed frame is provided with a plurality of latching portions, the plurality of latching portions being spaced apart in a sliding direction of the sliding frame; and the first locking member is movably arranged on another of the sliding frame and the fixed frame, to allow a first locking portion of the first locking member to be engaged with anddisengaged from a respective one of the latching portions; the latching portions are locking holes or locking teeth.

4. The connection structure according to claim 3, wherein the latching portions are locking holes, and the first locking member has a guide slope; and when the first locking member is engaged with the respective one of the latching portions, the first locking member is capable of limiting forward extending and movement of the sliding frame relative to the fixed frame, and the guide slope is pushed by an edge of a respective one of the locking holes to allow the sliding frame to retract backward relative to the fixed frame.

5. The connection structure according to claim 3 or 4, wherein the first locking member is pivotally connected to the fixed frame and has a locked position and an unlocked position; the base assembly further comprises a first unlocking mechanism operably connected to the first locking member; wherein the first unlocking mechanism comprises a driving member, the driving member being slidably arranged in the fixed frame and having a first position and a second position; and the first locking member has a driving portion, the driving member being adapted to abut against the driving portion and slide relative to the driving portion; wherein when the driving member is in the first position, the first locking member is in the locked position; and when the driving member slides to the second position, the driving member pushes against the driving portion, so that the first locking member rotates from the locked position to the unlocked position to allow the sliding frame to extend and move forward relative to the fixed frame; and the driving member is provided with a driving slope, and the driving portion is adapted to abut against the driving slope and slide along the driving slope to enable the first locking member to switch between the locked position and the unlocked position.

6. The connection structure according to claim 5, wherein a plurality of first locking members and a plurality of driving members are provided and are in one-to-one correspondence; the first unlocking mechanism further comprises: a first operating member operably arranged on the second base and exposed from thesecond base; a linkage component located in the first base and connected to each of the driving members to synchronously drive the driving members; and a first traction component connected to the first operating member and the linkage component; wherein when the first operating member is operated, the first operating member drives, through the first traction component, the linkage component to move, so as to drive the driving members to move from the first position to the second position.

7. The connection structure according to any one of claims 2 to 6, wherein the base assembly further comprises an elastic member; a first stopping portion is provided in the first base, and a second stopping portion is provided in the second base, wherein the elastic member abuts against and is between the first stopping portion and the second stopping portion, so that the first base and the second base have a tendency to move away from each other.

8. The connection structure according to any one of claims 1 to 7, wherein the first connection mechanism comprises: at least one connecting plug configured to be detachably connected to the car seat; and a plug connection component, the at least one connecting plug being rotatably connected to the base assembly through the plug connection component; wherein the first connection mechanism has a first pivot position and a second pivot position that are relative to the base assembly, the first connection mechanism is lockable in the first pivot position, and when the first connection mechanism is in the first pivot position, the first connection mechanism is in the folded state; and the first connection mechanism is lockable in the second pivot position, and when the first connection mechanism is in the second pivot position, the first connection mechanism is in the unfolded state.

9. The connection structure according to claim 8, wherein the plug connection component comprises: an internal connecting tube, an end portion of the internal connecting tube being connectedto a respective one of the at least one connecting plug; an external connecting tube rotatably sleeved outside the internal connecting tube and being fixedly connected to the base assembly; and a rotation locking mechanism connected between the internal connecting tube and the external connecting tube, the rotation locking mechanism having a locked state and an unlocked state, wherein when the rotation locking mechanism is in the locked state, the internal connecting tube is prevented from rotating relative to the external connecting tube, and when the rotation locking mechanism is in the unlocked state, the internal connecting tube is allowed to rotate relative to the external connecting tube.

10. The connection structure according to claim 8 or 9, wherein the first connection mechanism further has a third pivot position relative to the base assembly, wherein the first connection mechanism is lockable in the third pivot position, and when the first connection mechanism is in the third pivot position, the first connection mechanism is in the unfolded state, and extending directions of the first connection mechanism and the base assembly are not parallel to each other; and the third pivot position is different from the second pivot position; and / or the first connection mechanism further has a fourth pivot position relative to the base assembly, and when the first connection mechanism is in the fourth pivot position, a surface of the base assembly is adapted to abut against a backrest portion of the car seat.

11. The connection structure according to any one of claims 8 to 10, wherein the base assembly comprises a second locking member; and the plug connection component comprises an internal connecting tube, wherein an end portion of the internal connecting tube is connected to a respective one of the at least one connecting plug; the internal connecting tube is provided with a limiting element, the limiting element being configured to fit with the second locking member to enable a locking of the first connection mechanism in the unfolded state or in the folded state.

12. The connection structure according to claim 9 and optionally any one of claims 10 or 11, wherein the plug connection component further comprises a wear-resistant sleeve sleeved between the external connecting tube and the internal connecting tube,wherein the wear-resistant sleeve is connected to one of the external connecting tube and the internal connecting tube and is pivotable relative to another of the external connecting tube and the internal connecting tube, and hardness of the wear-resistant sleeve is less than that of the external connecting tube or the internal connecting tube.

13. The connection structure according to claim 9 and optionally any one of claims 10 to 12, wherein the rotation locking mechanism comprises: a second locking member slidably sleeved outside the internal connecting tube and being non-rotatable relative to the internal connecting tube, the second locking member being provided with a limiting portion and a second locking portion; and a second fitting portion arranged on the external connecting tube; wherein the second locking member has a third position and a fourth position, and when the second locking member is in the third position, the second locking portion is in locking fit with the second fitting portion to prevent the internal connecting tube from rotating relative to the external connecting tube; and when the second locking member is at the fourth position, the second locking portion is separated from the second fitting portion to allow the internal connecting tube to rotate relative to the external connecting tube, one of the second locking portion and the second fitting portion is a locking protrusion, another of the second locking portion and the second fitting portion is a locking recess, the locking recess is in concave-convex fit with the locking protrusion, and the base assembly further comprises a third unlocking mechanism, the third unlocking mechanism being operably connected to the second locking member and configured to drive the second locking member to move from the third position to the fourth position.

14. The connection structure according to claim 13, wherein the second locking member is provided with a tooth slot; and the third unlocking mechanism comprises: a driving wheel provided with meshing teeth, the driving wheel being rotatably arranged in the base assembly and meshing with the tooth slot through the meshing teeth to drive the second locking member to move.

15. The connection structure according to claim 14, wherein the third unlocking mechanism further comprises: a third operating member slidably arranged on the base assembly; and a third traction component connected between the third operating member and the driving wheel; wherein when the third operating member is operated, the third operating member is capable of driving, through the third traction component, the driving wheel to rotate to drive the second locking member to move from the third position to the fourth position, and the third traction component comprises: a third traction rope; and a third traction sleeve movably sleeved outside the third traction rope, wherein the third traction sleeve being a bendable wire sleeve and having a first sleeve end and a second sleeve end; the third traction rope has a first rope end adjacent to the first sleeve end and a second rope end adjacent to the second sleeve end; the first rope end of the third traction rope is connected to the driving wheel, and the second rope end of the third traction rope is connected to the base assembly; the first sleeve end of the third traction sleeve is connected to the base assembly, and the second sleeve end of the third traction sleeve is connected to the third operating member; and wherein when the third operating member is operated, the third traction sleeve is deformed to cause the third traction rope to pull the driving wheel to rotate, thereby driving the second locking member to move from the third position to the fourth position.

16. The connection structure according to claim 14 or 15, wherein two external connecting tubes are provided, and the two external connecting tubes are spaced apart in a length direction of the internal connecting tube; two second locking members are provided, the two second locking members are located between the two external connecting tubes and respectively corresponding to the two external connecting tubes; and two third unlocking mechanisms are provided and are respectively operably connected to the second locking members.

17. The connection structure according to claim 9 and optionally any one of claims 10 to 16, wherein the connection structure further comprises an abutting rod member configured to abut against a backrest portion of the car seat; wherein the abutting rod member is arranged on the base assembly; or the abutting rod member extends through the base assembly and is pivotally connected to the external connecting tube; or the abutting rod member extends through the base assembly and is pivotally connected to the internal connecting tube, wherein the connection structure further comprises a tether strap, the tether strap comprising a fixing portion and a connecting portion, and wherein the fixing portion is connected to the abutting rod member, and the connecting portion is configured to be connected to an anchor point of the car seat; or the connection structure further comprises a tether strap, the tether strap comprising a fixing portion and a connecting portion, wherein the abutting rod member is provided with a through portion, the tether strap extending through the through portion and connects the fixing portion to the child carrier; and the connecting portion is configured to be connected to an anchor point of the car seat.

18. The connection structure according to any one of claims 1 to 7, wherein the second connection mechanism comprises an engaging hook and a limiting groove provided on the base assembly, wherein the limiting groove is configured to accommodate one of the plurality of engaging members of the child carrier, and the engaging hook is pivotally connected to the base assembly and has a locked position and an unlocked position; when the engaging hook is in the locked position, the engaging hook at least partially extends into an opening of the limiting groove to lock and limit the one of the plurality of engaging members; an accommodating cavity is formed in the base assembly, and a groove wall of the limiting groove is provided with a perforation, the perforation being in communication with the accommodating cavity with the limiting groove; the engaging hook is provided with an accommodating groove matching the engaging member, wherein the accommodating groove is U-shaped, and two opposite sidewalls of the accommodating groove form a locking wall surface and a pushing wall surface respectively,wherein when the engaging hook is in the locked position, the one of the plurality of engaging members abuts against the pushing wall surface, a gap is formed between the locking wall surface and the engaging member.

19. The connection structure according to any one of claims 1 to 18, wherein the base assembly has a T-shaped structure; the first connection mechanism is pivotably connected to a vertical end portion of the T- shaped structure and has an unfolded state for connection with the car seat and a folded state for storage; and when the first connection mechanism is in the folded state, the first connection mechanism and the base assembly form an empty groove suitable for a user to hold.

20. The connection structure according to any one of claims 1 to 19, wherein the base assembly comprises a first base and a second base that are connected to each other, the first connection mechanism is configured to be connected to the first base, and the second connection mechanism is configured to be connected to the second base; and a bottom surface of the second base is arranged obliquely relative to a bottom surface of the first base, and an opening of an angle formed between the bottom surface of the second base and the bottom surface of the first base faces the car seat, so that when the child carrier is engaged with the second connection mechanism, the bottom surface of the first base is not in contact with the car seat.

21. A child carrier, comprising: a carrier body comprising the plurality of engaging members; and the connection structure according to any one of claims 1 to 20, the second connection mechanism of the connection structure being adapted to be detachably connected to one of the plurality of engaging members, wherein the first connection mechanism is an ISOFIX plug, the second connection mechanism is an engaging hook, and the plurality of engaging members comprising an engaging rod.

22. The child carrier according to claim 21, wherein the plurality of engaging members comprise:a front engaging member arranged at a front end of the carrier body; and a rear engaging member arranged at a rear end of the carrier body, wherein a width of the front engaging member in a left-right direction is greater than a width of the rear engaging member in the left-right direction; a width of the second connection mechanism in the left-right direction is greater than the width of the rear engaging member in the left-right direction; and when the carrier body is mounted on the connection structure, the second connection mechanism is engaged with the front engaging member.

23. The child carrier according to claim 22, wherein a bottom surface of the carrier body has a mounting groove, the front engaging member is located in the mounting groove, and when the connection structure is connected to the carrier body, the second base is engaged into the mounting groove.

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