Foldable crib

Abstract

The present disclosure provides a foldable crib. The foldable crib includes: a fixing base including a first connecting groove; a handrail tube, one end of the handrail tube being pivotally connected to a pillar mechanism, and the other end of the handrail tube being movably connected to the fixing base; and a linking mechanism configured for assisting the folding and unfolding of the foldable crib, one end of the linking mechanism being pivotally connected to the pillar mechanism, and the other end of the linking mechanism being pivotally connected to the fixing base. The linking mechanism includes a linking rod extending parallel to the handrail tube and a linking member extending non-parallel to the linking rod.

Description

Foldable baby crib Technical Field

[0001] The present disclosure relates to a foldable baby crib, and more particularly, to a foldable baby crib that can be operated with one hand. Background Art

[0002] A crib is used to carry babies or children and provide them with a space for sleeping or playing. Common cribs require locking structures to be provided on both the bottom frame (or base) and the armrests. When the unfolded crib needs to be folded, it is necessary to manually release the bottom frame or base first, and then manually release the four armrest joints separately before the crib can be folded. In other words, the folding operation of this crib has relatively cumbersome steps. Some other existing cribs can release the base and armrests synchronously, but this crib requires an additional synchronous release device or linkage structure between the base and the armrests, so it has a more complicated structure. In addition, some cribs in the prior art do not have a positioning structure after being folded, which makes the crib unable to remain in the folded position and cannot stand on its own, making the crib inconvenient to use. Summary of the Invention

[0003] One embodiment of the present disclosure provides a foldable crib. The foldable crib includes: a fixed base including a first connecting groove; an armrest tube, one end of the armrest tube being pivotally connected to the column mechanism at a third pivot point, and the other end of the armrest tube being movably connected to the fixed base at a fourth pivot point; and a linkage mechanism configured to assist in folding and unfolding the foldable crib, one end of the linkage mechanism being pivotally connected to the column mechanism, and the other end of the linkage mechanism being pivotally connected to the fixed base. The linkage mechanism includes a linkage rod extending parallel to the armrest tube and a linkage member extending non-parallel to the linkage rod.

[0004] In one embodiment, a connecting member is provided on the linkage mechanism or the armrest tube. The connecting member is slidable relative to the first connecting groove and has a locked position and a released position. When the connecting member is in the locked position, the armrest tube is locked relative to the fixing base and the column mechanism. When the connecting member is in the released position, the armrest tube is pivotable relative to the fixing base and the column mechanism to fold the foldable crib.

[0005] In one embodiment, the first connecting groove is configured as a first sliding groove in which the connecting member can slide, the first sliding groove includes a first groove section parallel to the length direction of the handrail tube, and a second groove section arranged at an angle to the first groove section, the two opposite ends of the first groove section constitute a locking position and a release position of the connecting member, and the second groove section is connected to the first groove section at the end of the first groove section corresponding to the release position.

[0006] In one embodiment, the first connecting groove is configured as a first locking groove provided at an edge of the fixing seat. When the connecting member is in the locking position, the connecting member is locked in the first locking groove. When the connecting member is in the unlocking position, the connecting member is disengaged from the first locking groove.

[0007] In one embodiment, the linkage rod is configured to slide relative to the handrail tube. The linkage member includes: a first linkage member, one end of the first linkage member is pivotally connected to the column mechanism at a fifth pivot point, and the other end of the first linkage member is pivotally connected to the first end of the linkage rod at a first pivot point; and a second linkage member, one end of the second linkage member is pivotally connected to the fixing base at a sixth pivot point, and the other end of the second linkage member is pivotally connected to the second end of the linkage rod at a second pivot point.

[0008] In one embodiment, the connecting rod is slidably disposed in the handrail tube, and narrow slots are provided at positions of the handrail tube corresponding to the first end and the second end of the connecting rod, so that the first connecting member and the second connecting member can extend from the handrail tube.

[0009] In one embodiment, the angle between the connecting line of the third pivot point and the fifth pivot point and the linkage rod gradually decreases during the folding process.

[0010] In one embodiment, the angle between the connecting line of the fourth pivot point and the sixth pivot point and the linkage rod gradually decreases during the folding process of the foldable baby crib.

[0011] In one embodiment, the connecting rod is slidably mounted on the handrail tube.

[0012] In one embodiment, the foldable crib further includes a synchronization assembly, which includes two synchronization members arranged crosswise, wherein one end of each of the two synchronization members is pivotally connected to one of the armrest tubes, and the other end of each of the two synchronization members can be pivotally and slidably connected to the fixing seat.

[0013] In one embodiment, the two synchronizers are respectively provided with a second sliding groove and a third sliding groove. The second fastener on the fixed seat is disposed in the second sliding groove and is capable of sliding and pivoting relative to the second sliding groove. The two third sliding grooves are disposed crosswise, and a third fastener is disposed at the intersection of the two third sliding grooves. The two synchronizers are capable of pivoting relative to the third fasteners.

[0014] In one embodiment, a guide groove is provided on the fixing seat, and the third fastener is disposed in the guide groove. When the handrail tube is pivoted and retracted relative to the fixing seat, the third fastener slides in the guide groove.

[0015] In one embodiment, the foldable baby crib further comprises a synchronization assembly comprising two synchronization members, which are two synchronization gears that rotate synchronously, and each of the two synchronization gears is linked to one of the armrest tubes.

[0016] In one embodiment, the two synchronous gears are rotatably connected to the fixed base via a rotating shaft, and the two synchronous gears are meshed with each other. Each of the two synchronous gears is provided with a linkage groove, and the connecting member is movably disposed in the linkage groove, so that rotation of the handrail tube can drive rotation of the synchronous gear.

[0017] In one embodiment, the rotating shaft is a columnar structure protruding from the outer surface of the synchronous gear, or is a connecting pin passing through the synchronous gear.

[0018] In one embodiment, the synchronous gear has an extension portion extending outward from an outer diameter thereof, and the linkage groove is located on the extension portion.

[0019] In one embodiment, the linkage groove is a groove extending along the diameter direction of the synchronous gear, or is a through hole penetrating the synchronous gear.

[0020] In one embodiment, each of the two synchronous gears is pivotally connected to the fixed base at one of the fourth pivot points, and the two synchronous gears are connected by a transmission device so that the two synchronous gears rotate synchronously. A locking mechanism is provided between each of the two synchronous gears and the corresponding handrail tube, so that rotation of the handrail tube can drive rotation of the synchronous gear.

[0021] In one embodiment, the engaging mechanism includes a first engaging member provided on the handrail tube and a second engaging member provided on the synchronous gear, and the first engaging member and the second engaging member are movably connected to each other.

[0022] In one embodiment, the pivotal connection position between the handrail tube and the column mechanism and the pivotal connection position between the linkage mechanism and the column mechanism are staggered in the vertical direction.

[0023] In one embodiment, the pivotal connection position between the handrail tube and the column mechanism and the pivotal connection position between the linkage mechanism and the column mechanism are staggered in the horizontal direction and the vertical direction.

[0024] In one embodiment, the column mechanism includes a column and a top corner piece, the top corner piece is fixedly connected to the upper end of the column, and one end of the handrail tube and one end of the first linking member are pivotally connected to the top corner piece respectively.

[0025] In one embodiment, the foldable crib further comprises a bottom frame, which comprises a bottom bar and a base, wherein both ends of the bottom bar are pivotally connected to the base and the column mechanism respectively, so that the bottom bar can pivot relative to the base and fold relative to each other.

[0026] In one embodiment, the column mechanism includes a column and a base, the column is pivotally connected to the base, and the base rod is fixedly connected to the base.

[0027] In one embodiment, the foot comprises a receiving recess and a rolling element at least partially disposed in the receiving recess. When the bottom bar is in the extended position, the rolling element is not in contact with the ground. When the bottom bar is pivoted and retracted, the rolling element contacts the ground to assist in retraction.

[0028] In one embodiment, the foldable baby crib further includes a first fixing member fixedly connected to the fixing base and disposed in a cavity of the fixing base to separate a side wall of the fixing base from the linkage mechanism or the synchronizer.

[0029] In one embodiment, the foldable baby crib further includes a second fixing member, wherein the second fixing member is fixedly connected to the armrest tube and is provided with a connecting opening, and one end of the synchronizing member is connected to the armrest tube in the connecting opening.

[0030] Another embodiment of the present disclosure provides a foldable baby crib. The foldable baby crib includes: a column mechanism; an armrest mechanism connected between the upper ends of the column mechanism. The armrest mechanism includes: a fixing seat including a first connecting groove; two armrest tubes, one end of each of the two armrest tubes is pivotally connected to the column mechanism, and the other end is pivotally connected to the fixing seat; and two linkage mechanisms, the linkage mechanisms are pivotally connected between the column mechanism and the fixing seat. It also includes a synchronization component, the synchronization component includes two synchronization parts that are synchronously linked, each of the two synchronization parts is linked to the corresponding armrest tube, so that the two armrest tubes can be synchronously folded or synchronously unfolded through the synchronization component.

[0031] In one embodiment, a connecting member is provided on the armrest tube or the linkage mechanism. The connecting member is movable relative to the first sliding slot and has a locked position and a released position. When the connecting member is in the locked position, the armrest tube is locked relative to the fixing base and the column mechanism. When the connecting member is in the released position, the armrest tube is pivotable relative to the fixing base and the column mechanism to fold the foldable crib.

[0032] In one embodiment, the two synchronizers are arranged crosswise. One end of each of the two synchronizers is pivotally connected to one of the two handrail tubes, and the other end is pivotally and slidably connected to the fixing seat.

[0033] In one embodiment, the two synchronizers are two synchronized gears that rotate synchronously, and each of the two synchronized gears is linked to one of the handrail tubes.

[0034] In one embodiment, the linkage mechanism includes a first linkage member, a linkage rod, and a second linkage member, one end of the first linkage member is pivotally connected to the column mechanism, the other end of the first linkage member is pivotally connected to the first end of the linkage rod, one end of the second linkage member is pivotally connected to the fixed seat, and the other end of the second linkage member is pivotally connected to the second end of the linkage rod.

[0035] The connecting rod is slidably arranged in the handrail tube. The handrail tube is provided with narrow slots at positions corresponding to the first end and the second end of the connecting rod, so that the first connecting piece and the second connecting piece can extend from the handrail tube.

[0036] In one embodiment, the linkage mechanism is an auxiliary tube arranged parallel to the handrail tube, one end of the auxiliary tube is pivotally connected to the column mechanism, and the other end is pivotally connected to the fixing seat.

[0037] In one embodiment, each of the two synchronizers is provided with a second sliding groove and a third sliding groove spaced apart from each other. A fastener fixedly connected to the fixed seat is disposed in the second sliding groove and is capable of sliding and pivoting relative to the second sliding groove. The two third sliding grooves are disposed crosswise, and another fastener is disposed at the intersection of the two third sliding grooves, and the two synchronizers are capable of pivoting and sliding relative to the other fastener.

[0038] Another embodiment of the present disclosure provides a foldable baby crib. The foldable baby crib includes: a column mechanism; an armrest tube, one end of the armrest tube is pivotally connected to the column mechanism; a fixing seat, the other end of the armrest tube is pivotally and slidably connected to the fixing seat; and a linkage mechanism for assisting the folding and unfolding of the foldable baby crib. The linkage mechanism includes a linkage rod extending parallel to the armrest tube and a linkage member extending non-parallel to the linkage rod. The linkage mechanism is pivotally connected to the column mechanism and the fixing seat respectively through the corresponding linkage members. The linkage rod is pivotally connected to the corresponding linkage member through a first pivot point and a second pivot point.

[0039] The foldable crib has an expanded state and a folded state. During the switching process of the foldable crib between the expanded state and the folded state, the positions of the first pivot point and the second pivot point relative to the armrest tube continuously change in a direction parallel to the armrest tube.

[0040] In one embodiment, the first pivot point and the second pivot point are located further away from the connection between the armrest tube and the column mechanism when the foldable crib is in the folded state than when the foldable crib is in the expanded state.

[0041] In one embodiment, the handrail tube is pivotally connected to the column mechanism through a third pivot point, the handrail tube is pivotally connected to the fixed seat through a fourth pivot point, the corresponding connecting member connected at the first pivot point is pivotally connected to the column mechanism through a fifth pivot point, and the corresponding connecting member connected at the second pivot point is pivotally connected to the fixed seat through a sixth pivot point.

[0042] The lines connecting the first pivot point, the third pivot point, and the fifth pivot point form a first triangle, and the lines connecting the second pivot point, the fourth pivot point, and the sixth pivot point form a second triangle. During the transition of the foldable crib between the expanded and folded states, the angles of the corners of the first and second triangles continuously change.

[0043] In one embodiment, in the first triangle, the angle at the first pivot point is angle α1, the angle at the third pivot point is angle α3, and the angle at the fifth pivot point is angle α5, wherein, during the process of the foldable crib switching from the expanded state to the folded state, the angle α3 of the first triangle gradually decreases, the angle α5 gradually increases, and the angle α1 first increases and then decreases.

[0044] In one embodiment, in the second triangle, the angle at the second pivot point is angle α2, the angle at the fourth pivot point is angle α4, and the angle at the sixth pivot point is angle α6, wherein, during the process of the foldable crib switching from the expanded state to the folded state, the angle α6 of the second triangle gradually decreases, the angle α4 gradually increases, and the angle α2 first increases and then decreases.

[0045] In one embodiment, the linkage rod is slidably disposed within the handrail tube. The linkage member comprises: a first linkage member, one end of the first linkage member being pivotally connected to the column mechanism at the fifth pivot point, and the other end of the first linkage member being pivotally connected to the first end of the linkage rod at the first pivot point; and a second linkage member, one end of the second linkage member being pivotally connected to the fixing seat at the sixth pivot point, and the other end of the second linkage member being pivotally connected to the second end of the linkage rod at the second pivot point.

[0046] In one embodiment, the foldable crib further includes: a synchronization assembly, the synchronization assembly including two synchronization members arranged crosswise, one end of each of the two synchronization members being pivotally connected to the armrest tube, and the other end being pivotally and slidably connected to the fixing base, so that the armrest tubes located on both sides of the fixing base can be folded synchronously.

[0047] One embodiment of the present disclosure provides a foldable crib. The foldable crib includes: a fixed base including a first sliding groove; an armrest tube, one end of the armrest tube being pivotally connected to the column mechanism at a third pivot point, and the other end of the armrest tube being movably connected to the fixed base at a fourth pivot point; and a linkage mechanism configured to assist in folding and unfolding the foldable crib, one end of the linkage mechanism being pivotally connected to the column mechanism, and the other end of the linkage mechanism being pivotally connected to the fixed base. The linkage mechanism includes a linkage rod extending parallel to the armrest tube and a linkage member extending non-parallel to the linkage rod.

[0048] In one embodiment, a first connector is provided on the linkage mechanism or the armrest tube. The first connector is capable of sliding in the first sliding groove and has a locked position and a released position. When the first connector is in the locked position, the armrest tube is locked relative to the fixing base and the column mechanism. When the first connector is in the released position, the armrest tube is capable of pivoting relative to the fixing base and the column mechanism to fold the foldable crib.

[0049] In one embodiment, the first sliding groove includes a first groove section parallel to the length direction of the handrail tube, and a second groove section arranged at an angle to the first groove section, the two opposite ends of the first groove section constitute the locking position and the release position of the first connecting member, and the second groove section is connected to the first groove section at the end of the first groove section corresponding to the release position.

[0050] In one embodiment, the linking member includes: a first linking member, one end of the first linking member is pivotally connected to the column mechanism at a fifth pivot point, and the other end of the first linking member is pivotally connected to the first end of the linking rod at a first pivot point; and a second linking member, one end of the second linking member is pivotally connected to the fixed seat at a sixth pivot point, and the other end of the second linking member is pivotally connected to the second end of the linking rod at a second pivot point.

[0051] The connecting rod is slidably arranged in the handrail tube. The handrail tube is provided with narrow slots at positions corresponding to the first end and the second end of the connecting rod, so that the first connecting piece and the second connecting piece can extend from the handrail tube.

[0052] In one embodiment, the angle between the connecting line of the third pivot point and the fifth pivot point and the linkage rod gradually decreases during the folding process.

[0053] In one embodiment, the angle between the connecting line of the fourth pivot point and the sixth pivot point and the linkage rod gradually decreases during the folding process of the foldable baby crib.

[0054] In one embodiment, the foldable crib further includes a synchronization assembly, which includes two synchronization members arranged in an alternating manner, one end of each of the two synchronization members is pivotally connected to the armrest tube, and the other end can be pivotally and slidably connected to the fixed base.

[0055] In one embodiment, the two synchronizers are respectively provided with a second sliding groove and a third sliding groove. The second fastener on the fixed seat is disposed in the second sliding groove and is capable of sliding and pivoting relative to the second sliding groove. The two third sliding grooves are staggered, and a third fastener is disposed at the intersection of the two third sliding grooves. The two synchronizers are capable of pivoting relative to the third fasteners.

[0056] In one embodiment, a guide groove is provided on the fixing seat, and the third fastener is disposed in the guide groove. When the handrail tube is pivoted and retracted relative to the fixing seat, the third fastener slides in the guide groove.

[0057] In one embodiment, the pivotal connection position between the handrail tube and the column mechanism and the pivotal connection position between the linkage mechanism and the column mechanism are staggered in the vertical direction.

[0058] In one embodiment, the pivotal connection position between the handrail tube and the column mechanism and the pivotal connection position between the linkage mechanism and the column mechanism are staggered in the horizontal direction and the vertical direction.

[0059] In one embodiment, the column mechanism includes a column and a top corner piece, the top corner piece is fixedly connected to the upper end of the column, and one end of the handrail tube and one end of the first linking member are pivotally connected to the top corner piece respectively.

[0060] In one embodiment, the foldable crib further comprises a bottom frame, which comprises a bottom bar and a base, wherein both ends of the bottom bar are pivotally connected to the base and the column mechanism respectively, so that the bottom bar can pivot relative to the base and fold relative to each other.

[0061] In one embodiment, the column mechanism includes a column and a base, the column is pivotally connected to the base, and the base rod is fixedly connected to the base.

[0062] In one embodiment, the foot comprises a receiving recess and a rolling element at least partially disposed in the receiving recess. When the bottom bar is in the extended position, the rolling element is not in contact with the ground. When the bottom bar is pivoted and retracted, the rolling element contacts the ground to assist in retraction.

[0063] In one embodiment, the foldable baby crib further includes a first fixing member fixedly connected to the fixing base and disposed in a cavity of the fixing base to separate a side wall of the fixing base from the linkage mechanism or the synchronizer.

[0064] In one embodiment, the foldable baby crib further includes a second fixing member, wherein the second fixing member is fixedly connected to the armrest tube and is provided with a connecting opening, and one end of the synchronizing member is connected to the armrest tube in the connecting opening.

[0065] Another embodiment of the present disclosure provides a foldable baby crib. The foldable baby crib includes: a column mechanism; an armrest mechanism, connected between the upper ends of the column mechanism. The armrest mechanism includes: a fixed seat, including a first sliding groove; two armrest tubes, one end of each of the two armrest tubes is pivotally connected to the column mechanism, and the other end is pivotally connected to the fixed seat; and two linkage mechanisms, the linkage mechanisms are pivotally connected between the column mechanism and the fixed seat. It also includes a synchronization component, the synchronization component includes two synchronization members arranged in an alternating manner, one end of each of the two synchronization members is pivotally connected to one of the two armrest tubes, and the other end is pivotally and slidably connected to the fixed seat.

[0066] In one embodiment, a first connector is provided on the armrest tube or the linkage mechanism. The first connector is movable within the first sliding slot and has a locked position and a released position. When the first connector is in the locked position, the armrest tube is locked relative to the fixing base and the column mechanism. When the first connector is in the released position, the armrest tube is pivotable relative to the fixing base and the column mechanism to fold the foldable crib.

[0067] In one embodiment, the linkage mechanism includes a first linkage member, a linkage rod, and a second linkage member, one end of the first linkage member is pivotally connected to the column mechanism, the other end of the first linkage member is pivotally connected to the first end of the linkage rod, one end of the second linkage member is pivotally connected to the fixed seat, and the other end of the second linkage member is pivotally connected to the second end of the linkage rod.

[0068] The connecting rod is slidably arranged in the handrail tube. The handrail tube is provided with narrow slots at positions corresponding to the first end and the second end of the connecting rod, so that the first connecting piece and the second connecting piece can extend from the handrail tube.

[0069] In one embodiment, the linkage mechanism is an auxiliary tube arranged parallel to the handrail tube, one end of the auxiliary tube is pivotally connected to the column mechanism, and the other end is pivotally connected to the fixing seat.

[0070] In one embodiment, each of the two synchronizers is provided with a second sliding groove and a third sliding groove spaced apart from each other. A fastener fixedly connected to the fixed seat is disposed in the second sliding groove and is capable of sliding and pivoting relative to the second sliding groove. The two third sliding grooves are staggered, and another fastener is disposed at the intersection of the two third sliding grooves, and the two synchronizers are capable of pivoting and sliding relative to the other fastener.

[0071] Another embodiment of the present disclosure provides a foldable baby crib. The foldable baby crib includes: a column mechanism; an armrest tube, one end of the armrest tube is pivotally connected to the column mechanism; a fixing seat, the other end of the armrest tube is pivotally and slidably connected to the fixing seat; and a linkage mechanism for assisting the folding and unfolding of the foldable baby crib. The linkage mechanism includes a linkage rod extending parallel to the armrest tube and a linkage member extending non-parallel to the linkage rod. The linkage mechanism is pivotally connected to the column mechanism and the fixing seat respectively through the corresponding linkage members. The linkage rod is pivotally connected to the corresponding linkage member through a first pivot point and a second pivot point.

[0072] The foldable crib has an expanded state and a folded state. During the switching process of the foldable crib between the expanded state and the folded state, the positions of the first pivot point and the second pivot point relative to the armrest tube continuously change in a direction parallel to the armrest tube.

[0073] In one embodiment, the first pivot point and the second pivot point are located further away from the connection between the armrest tube and the column mechanism when the foldable baby playpen is in the folded state than when the foldable baby playpen is in the unfolded state.

[0074] In one embodiment, the handrail tube is pivotally connected to the column mechanism through a third pivot point, the handrail tube is pivotally connected to the fixed seat through a fourth pivot point, the corresponding connecting member connected at the first pivot point is pivotally connected to the column mechanism through a fifth pivot point, and the corresponding connecting member connected at the second pivot point is pivotally connected to the fixed seat through a sixth pivot point.

[0075] The lines connecting the first pivot point, the third pivot point, and the fifth pivot point form a first triangle, and the lines connecting the second pivot point, the fourth pivot point, and the sixth pivot point form a second triangle. During the transition of the foldable crib between the expanded and folded states, the angles of the corners of the first and second triangles continuously change.

[0076] In one embodiment, in the first triangle, the angle at the first pivot point is angle α1, the angle at the third pivot point is angle α3, and the angle at the fifth pivot point is angle α5, wherein, during the process of the foldable crib switching from the expanded state to the folded state, the angle α3 of the first triangle gradually decreases, the angle α5 gradually increases, and the angle α1 first increases and then decreases.

[0077] In one embodiment, in the second triangle, the angle at the second pivot point is angle α2, the angle at the fourth pivot point is angle α4, and the angle at the sixth pivot point is angle α6, wherein, during the process of the foldable crib switching from the expanded state to the folded state, the angle α6 of the second triangle gradually decreases, the angle α4 gradually increases, and the angle α2 first increases and then decreases.

[0078] In one embodiment, the linkage rod is slidably disposed within the handrail tube. The linkage member comprises: a first linkage member, one end of the first linkage member being pivotally connected to the column mechanism at the fifth pivot point, and the other end of the first linkage member being pivotally connected to the first end of the linkage rod at the first pivot point; and a second linkage member, one end of the second linkage member being pivotally connected to the fixing seat at the sixth pivot point, and the other end of the second linkage member being pivotally connected to the second end of the linkage rod at the second pivot point.

[0079] In one embodiment, the foldable crib further includes: a synchronization assembly, the synchronization assembly including two synchronization members arranged in an alternating manner, one end of each of the two synchronization members being pivotally connected to the armrest tube, and the other end being pivotally and slidably connected to the fixing base, so that the armrest tubes located on both sides of the fixing base can be folded synchronously.

[0080] 14. The foldable baby crib as claimed in claim 13, wherein the first armrest tube and the second armrest tube are pivotally connected to each other and are arranged on a track to move relative to each other in a track to move the first armrest tube and the second armrest tube respectively.

[0081] In one embodiment, the foldable crib further includes a column mechanism, a first sliding groove is provided on the fixed seat, and a first connecting member is provided on each of the first armrest tube and the second armrest tube, or a first connecting member is provided on the fixed seat, and a first sliding groove is provided on each of the first armrest tube and the second armrest tube, the first connecting member can slide in the first sliding groove and has a locking position and a release position, when the first connecting member is in the locking position, the armrest tube is locked relative to the fixed seat and the column mechanism; and when the first connecting member is in the release position, the armrest tube can pivot relative to the fixed seat and the column mechanism to fold the foldable crib.

[0082] In one embodiment, the foldable baby crib further includes a linkage mechanism, wherein the column mechanism is connected to the first armrest tube and the second armrest tube, one end of the linkage mechanism is pivotally connected to the column mechanism, and the other end of the linkage mechanism is pivotally connected to the fixed seat, and the linkage mechanism is configured such that the pivoting of the column mechanism relative to the first armrest tube and the second armrest tube drives the first armrest tube and the second armrest tube to move relative to the fixed seat, so that the first armrest tube and the second armrest tube are released relative to the fixed seat.

[0083] In one embodiment, the linkage mechanism includes a linkage rod extending parallel to the first handrail tube and the second handrail tube and a linkage member extending non-parallel to the linkage rod, the linkage member including: a first linkage member, one end of the first linkage member is pivoted to the column mechanism at a fifth pivot point, and the other end of the first linkage member is pivoted to the first end of the linkage rod at a first pivot point; and a second linkage member, one end of the second linkage member is pivoted to the fixing seat at a sixth pivot point, and the other end of the second linkage member is pivoted to the second end of the linkage rod at a second pivot point, wherein the linkage rod is configured to be able to slide relative to the first handrail tube and the second handrail tube along the extension direction of the first handrail tube and the second handrail tube.

[0084] In one embodiment, the first synchronizer and the second synchronizer are arranged in an alternating manner, the first ends of the first synchronizer and the second synchronizer are respectively pivotally connected to the fixed seat in a sliding manner, and the second ends of the first synchronizer and the second synchronizer are respectively pivotally connected to the first handrail tube and the second handrail tube.

[0085] In one embodiment, a third fastener is provided at an intersection of the first synchronizer and the second synchronizer, and the first synchronizer and the second synchronizer are capable of pivoting relative to the third fastener.

[0086] In one embodiment, a guide groove is provided on the fixing seat, and the third fastener is provided in the guide groove. When the handrail tube pivots relative to the fixing seat, the third fastener slides in the guide groove.

[0087] In one embodiment, the synchronization assembly further includes a third synchronization member and a fourth synchronization member, wherein the first ends of the third synchronization member and the fourth synchronization member are pivotally connected to each other, and the second end of the third synchronization member is pivotally connected between the first end and the second end of the first synchronization member, and the second end of the fourth synchronization member is pivotally connected between the first end and the second end of the second synchronization member.

[0088] In one embodiment, the fixing base includes a fixing base shell and a fixing member connected to the fixing base shell. The lower end of the fixing base shell has an opening, and the fixing member is configured to cover the opening.

[0089] In one embodiment, the fixing member includes a first fixing member and a second fixing member, and a gap is provided between the first fixing member and the second fixing member, so that the first synchronizer and the second synchronizer are movably located between the first fixing member and the second fixing member.

[0090] In one embodiment, each of the first fixing member and the second fixing member has a rotation guide surface, and a positioning protrusion is formed on each of the rotation guide surfaces. When the foldable baby crib is in the folded state, the positioning protrusion applies resistance to the pivoting of the first armrest tube and the second armrest tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification. The accompanying drawings illustrate embodiments of the disclosure and together with the description serve to explain the concept of the disclosure.

[0092] FIG1 is a perspective view of a foldable baby crib according to a first embodiment of the present disclosure.

[0093] FIG. 2 is a front view of the armrest mechanism of the foldable crib shown in FIG. 1 .

[0094] FIG3A is a partial cross-sectional view of the armrest mechanism shown in FIG2 .

[0095] FIG. 3B is an enlarged view of portion A shown in FIG. 3A .

[0096] FIG. 3C is a schematic diagram of a triangle formed by corresponding pivot points shown in FIG. 3A .

[0097] FIG4A is a schematic diagram of the armrest mechanism shown in FIG3A in a folded state.

[0098] FIG. 4B is a schematic diagram of a triangle formed by corresponding pivot points shown in FIG. 4A .

[0099] FIG5 is a front view of a fixing base according to the first embodiment of the present disclosure.

[0100] 6A and 6B are partial perspective views of the armrest mechanism according to the first embodiment of the present disclosure.

[0101] 7 to 9 are schematic diagrams illustrating the folding process of the foldable baby crib according to the first embodiment of the present disclosure.

[0102] FIG. 10 is a perspective view of a foldable baby crib according to a second embodiment of the present disclosure.

[0103] FIG. 11A is a perspective view of the column mechanism shown in FIG. 10 .

[0104] FIG11B is a perspective view of the column mechanism shown in FIG11A in another state.

[0105] 12A and 12B are respectively partial exploded views of an armrest mechanism according to a second embodiment of the present disclosure.

[0106] FIG13 is a perspective view of an armrest mechanism according to a third embodiment of the present disclosure.

[0107] 14A to 14C are perspective views of an armrest mechanism according to a fourth embodiment of the present disclosure.

[0108] FIG15 is a perspective view of the synchronizer of the armrest mechanism shown in FIG14C.

[0109] FIG. 16 is a perspective view of a connecting rod according to a fifth embodiment of the present disclosure.

[0110] 17A and 17B are perspective views of the linkage rod shown in FIG. 16 installed in a foldable crib.

[0111] 18 is a front view of an armrest mechanism of a foldable baby playpen according to a sixth embodiment of the present disclosure.

[0112] FIG. 19A is another front view of the armrest mechanism shown in FIG. 18 , with the front fixing base removed.

[0113] FIG19B is an enlarged view of portion B shown in FIG19A .

[0114] FIG. 19C is a perspective view of the synchronization assembly shown in FIG. 19A .

[0115] 20A and 20B are partial views of the foldable crib shown in FIG. 19A in a folded state.

[0116] FIG21 is a front view of the fixing seat shown in FIG18.

[0117] 22A and 22B are side perspective views of a foldable crib in different states according to a sixth embodiment of the present disclosure.

[0118] 23A is a front view of a synchronization assembly of a foldable crib according to a seventh embodiment of the present disclosure.

[0119] FIG. 23B is a front view of the synchronization assembly shown in FIG. 23A in another state.

[0120] FIG24 is a cross-sectional view of the first synchronization gear shown in FIG23A .

[0121] FIG. 25 is a perspective view of the first synchronization gear shown in FIG. 23A .

[0122] 26A and 26B are front views of the first synchronization gear at different positions on the handrail tube, respectively.

[0123] FIG27 is a partial cross-sectional view of an armrest mechanism according to a seventh embodiment of the present disclosure.

[0124] FIG28 is a perspective view of a fixing seat provided on an armrest mechanism according to a seventh embodiment of the present disclosure.

[0125] FIG. 29 is a front view of an armrest mechanism of a foldable crib according to an eighth embodiment of the present disclosure.

[0126] FIG30 is a partial enlarged view of the armrest mechanism shown in FIG29.

[0127] FIG31 is a partially enlarged view of the armrest mechanism shown in FIG29 in another state.

[0128] 32 to 34 are partial enlarged views of the armrest mechanism shown in FIG. 29 in different states, with the front fixing seat removed.

[0129] FIG35 is a perspective view of the synchronous gear shown in FIG32.

[0130] FIG36 is a cross-sectional view taken along line XX in FIG32.

[0131] FIG37 is a schematic diagram of the armrest mechanism of the foldable baby crib according to the eighth embodiment of the present disclosure when unfolded.

[0132] FIG38 is a schematic diagram of the armrest mechanism shown in FIG37 when folded.

[0133] FIG39A is a perspective view of a foldable crib according to a ninth embodiment of the present disclosure;

[0134] FIG39B is a plan view of a foldable crib according to a ninth embodiment of the present disclosure;

[0135] FIG40 is a partial enlarged view of portion G of FIG39A;

[0136] FIG41 is a cross-sectional view of an armrest mechanism of a foldable baby crib according to a ninth embodiment of the present disclosure;

[0137] FIG42A is a partial enlarged view of portion B of FIG41 , wherein the handrail tube is in a released state relative to the fixing seat;

[0138] 42B is a partial cross-sectional view of the armrest mechanism of the foldable crib according to the ninth embodiment of the present disclosure, wherein the armrest tube is in a locked state relative to the fixing base;

[0139] 43 is a cross-sectional view of an armrest mechanism of a foldable crib according to a ninth embodiment of the present disclosure, wherein the armrest tubes are in a folded state;

[0140] FIG44 is a partial enlarged view of portion E of FIG43;

[0141] FIG45 is a perspective view of a synchronization assembly of a foldable crib according to a ninth embodiment of the present disclosure;

[0142] 46 is a perspective view of a synchronization assembly of a foldable crib according to a ninth embodiment of the present disclosure from another angle;

[0143] FIG47 is an exploded perspective view of some components of a foldable baby crib according to a ninth embodiment of the present disclosure;

[0144] FIG48 is a cross-sectional view of an armrest mechanism of a foldable baby crib according to a tenth embodiment of the present disclosure;

[0145] FIG49 is a partial enlarged view of portion D of FIG48;

[0146] FIG50 is a perspective view of a first fixing member of a foldable baby crib according to an eleventh embodiment of the present disclosure;

[0147] FIG51 is a perspective view of some components of a foldable baby playpen according to an eleventh embodiment of the present disclosure, wherein the armrest tubes are in an unfolded state;

[0148] 52 is a perspective view of some components of the armrest mechanism of the foldable baby playpen according to the eleventh embodiment of the present disclosure, wherein the armrest tubes are in an extended state;

[0149] FIG53 is a perspective view of some components of the armrest mechanism of the foldable baby crib according to the eleventh embodiment of the present disclosure, wherein the armrest tubes are in a folded state;

[0150] 54 is a partial cross-sectional view of the armrest mechanism of the foldable baby crib according to the eleventh embodiment of the present disclosure, wherein the armrest tubes are in an expanded state;

[0151] 55 is a partial cross-sectional view of the armrest mechanism of the foldable baby playpen according to the eleventh embodiment of the present disclosure, wherein the armrest tubes are in a folded state.

[0152] : The reference numerals are described as follows: Foldable crib 100, 200, 400, 500; upright column 110, 210, 310, 610, 810; fixing base 120, 220, 320, 420, 720, 820; first sliding groove 121, 621, 721; first groove section 121a, 621a; second groove section 121b, 621b; first locking groove 821; guide groove 122; first fixing member 223; transverse section 223a; vertical section 223b; through hole 223c; second fixing member 224; shape adapting member 224a; first connecting opening 224b; second connecting opening 224c; armrest tube 130, 230, 330, 430, 530, 630, 730, 830; fixing portion 530a; long hole 131, 631, 731, 831 First connecting member 132, 432, 632, 732 Second connecting member 833 Corner member 140, 340, 640, 840 Linking mechanism 150, 350, 450, 650, 850 Linking rod 151, 451, 551 Notch 551a First connecting member 152, 252, 452 Second connecting member 153, 253, 453 Auxiliary tube 351 Engaging mechanism 760 First matching member 761 Second matching member 762 Synchronizing assembly 170, 470, 670, 770, 870 First synchronizer 171, 271, 471 Second sliding groove 171a Third sliding groove 171b First sheet member 471c Second sheet member 471d Connecting piece 471e Second synchronizer 172, 272, 472 First synchronizer gear 671, 771, 871 First linkage groove 671a, 871a extension portion 672b, 872b second synchronization gear 672, 772, 872 second linkage groove 672a first rotation axis 673, 873 second rotation axis 674, 874 transmission device 775 bottom frame 180, 280 bottom bar 181, 281 base 182, 282 support member 283 bottom foot 190, 290 storage recess 291 rolling member 292 first fastening member 101, 601, 701 second fastening member 102, 202, 402 third fastening member 103, 203, 403 wear-resistant member 104 accessory 505 first pivot point P1 second pivot point P2 third pivot point P3 fourth pivot point P4 fifth pivot point P5 sixth pivot point P6 transverse direction D1 longitudinal direction D2 vertical direction D3 first triangle T1 Second triangle T2 Angles α1, α2, α3, α4, α5, α6 Foldable crib 400s Post 410s Fixing base 420s Fixing base housing 421s Opening 4211s First piece 4212s Second piece 4213s Connecting piece 4214s Fixing member 422s First fixing member 423s Second fixing member 424s Guide groove 425sSpacer 426s, Rotation Guide Surface 427s, Positioning Protrusion 4271s, Rotation Stop Surface 428s, Engaging Section 429s, Handrail Tube 430s, First Handrail Tube 430as, Second Handrail Tube 430bs, Engaging Member 432s, Abutting Section 433s, Top Angle Member 440s, Linking Mechanism 450s, Linking Rod 451s, First Linking Member 452s, Second Linking Member 453s, Synchronizing Assembly 470s, First Synchronizing Member 471s, Second Synchronizing Member 472s, Third Synchronizing Member 473s, Fourth Synchronizing Member 474s, Bottom Frame 480s, Bottom Rod 481s, Base 482s, First Fastener 401s, Second Fastener 402s, Third Fastener 403s, Fourth Fastener 404s, Fifth Fastener 405s, Sixth Fastener 406s DETAILED DESCRIPTION

[0153] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate alternative embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0154] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings.

[0155] Referring to FIG1 , FIG1 is a perspective view of a foldable crib 100 according to a first embodiment of the present disclosure. As shown in FIG1 , the foldable crib 100 may include a column mechanism and an armrest mechanism, wherein the armrest mechanism is connected between the column mechanisms, for example, connected to the upper end or top end of the column mechanism. In one example, the column mechanism includes a column 110. In this embodiment, the foldable crib 100 may include four columns 110 and four armrest mechanisms respectively connected between two adjacent columns 110 to form a quadrilateral structure at the upper end of the crib 100. The armrest mechanism can pivot relative to the columns 110, for example, one end of the armrest mechanism can be pivotally connected (i.e., pivotally connected) to the columns 110. Through the pivotal connection between the armrest mechanism and the columns 110, the four armrest mechanisms can pivot respectively relative to the columns 110 to which they are connected, thereby enabling the columns 110 to be brought closer to each other and achieving the overall folding of the crib 100.

[0156] In one example, as shown in FIG1 , the column mechanism may further include a top corner piece 140. The top corner piece 140 may be fixedly connected to the column 110. In this embodiment, the crib 100 may have four top corner pieces 140, respectively disposed at the upper ends or top ends of the four columns 110. In this example, the armrest mechanism may be pivotally connected to the top corner pieces 140 (rather than directly to the aforementioned columns 110). In other words, each armrest mechanism may be pivotally connected between two top corner pieces 140 to enable pivoting relative to the column 110.

[0157] Optionally, the column mechanism may further include a foot 190. The foot 190 is disposed at the lower end of the column 110 and abuts against the ground to support the crib 100 on the ground. In one example, the foot 190 may be fixedly connected to the column 110, for example, being sleeved around the bottom end of the column 110.

[0158] In addition, the foldable crib 100 may further include a bottom frame 180, which is connected between the column mechanism (i.e., the columns 110 or the feet 190). In this embodiment, the bottom frame 180 can have a locked state and a released state. When the crib 100 is deployed, the bottom frame 180 can be locked to maintain the deployment state. When the bottom frame 180 is in the released state, the entire foldable crib 100 can be folded and deployed by operating the bottom frame 180. Specifically, the bottom frame 180 may include a bottom bar 181 and a base 182. The ends of the bottom bar 181 are respectively pivotally connected to the base 182 and the column mechanism (e.g., the columns 110 or the feet 190), so that the bottom bar 181 can pivot relative to the base 182 and fold relative to each other. Alternatively, the bottom bar 181 may be a tubular member (i.e., having a hollow structure) or a solid rod, but the present disclosure is not limited thereto.

[0159] In one specific example, the bottom frame 180 includes four bottom bars 181. Each bottom bar 181 has one end (i.e., the inner end) pivotally connected to the base 182 and the other end (i.e., the outer end) pivotally connected to the foot 190 or the lower end of the column 110. Optionally, the four bottom bars 181 are symmetrically arranged relative to the base 182 in the longitudinal direction D1 and the transverse direction D2 of the foldable crib 100. When the bottom frame 180 is in a locked state (see FIG. 1 ), the foldable crib 100 can remain in the deployed state. When the bottom frame 180 is in an unlocked state (not shown), the bottom bars 181 can pivot relative to the base 182 and collapse relative to each other, for example, by moving the base 182 upward (i.e., pulling the base 182 upward along the force F shown in FIG. 1 ), thereby driving the column mechanism and, in turn, the entire crib 100 to collapse. The specific folding process will be described below in conjunction with FIG. 7 to FIG. 9 and will not be described in detail here.

[0160] Figure 2 is a front view of the armrest mechanism of the foldable crib 100 shown in Figure 1, Figure 3A is a partial cross-sectional view of the armrest mechanism shown in Figure 2, Figure 3B is an enlarged view of portion A shown in Figure 3A, Figure 3C is a schematic diagram of the triangle formed by the corresponding pivot points shown in Figure 3A, Figure 4A is a view of the armrest mechanism shown in Figure 3A in a folded state, Figure 4B is a schematic diagram of the triangle formed by the corresponding pivot points shown in Figure 4A, and Figure 5 is a front view of the fixing base 120.

[0161] With reference to Figures 1 to 3B , the armrest mechanism includes a fixed base 120, an armrest tube 130, and a linkage mechanism 150. In this embodiment, the armrest tube 130 is symmetrically arranged on both sides of the fixed base 120 relative to the center line C1 of the fixed base 120 in the transverse direction (i.e., its width direction). Specifically, one end of the armrest tube 130 is pivoted to the column mechanism (such as the column 110 or the top corner piece 140), for example, see the third pivot point P3 in Figure 3A. The other end of the armrest tube 130 is movably connected to the fixed base 120. In one example, the other end of the armrest tube 130 is pivoted to the fixed base 120, for example, connected to the fourth pivot point P4 via a first fastener 101, see Figures 3A and 3B. Further, the other end of the armrest tube 130 can be slidably pivoted to the fixed base 120. For example, a long hole 131 may be provided at the position where the handrail tube 130 is connected to the fixed seat 120, that is, a hole extending along the length direction of the handrail tube 130. The first fastener 101 is fixedly connected to the fixed seat 120 and can be slidably provided in the long hole 131. In other words, as shown in Figures 2 and 3B, the first fastener 101 can pass through the long hole 131 provided on the handrail tube 130 and can slide in the long hole 131, and is fixedly connected to the fixed seat 120, so that the handrail tube 130 can not only pivot relative to the fixed seat 120, but also slide along the lateral direction of the fixed seat 120. Of course, in other embodiments, the long hole 131 can also be provided on the fixed seat 120, and the present disclosure is not limited thereto, as long as the pivoting and sliding cooperation of the handrail tube 130 relative to the fixed seat 120 can be achieved at the same time.

[0162] In this embodiment, as shown in FIG2 , the fixed base 120 may be provided with a first connecting groove, such as the first sliding groove 121 in this embodiment, and the other end of the handrail tube 130 (i.e., the end connected to the fixed base 120) may be correspondingly provided with a connecting member, such as the first connecting member 132 in this embodiment. In this embodiment, the first sliding groove 121 is provided on the fixed base 120 near the first fastener 101, and the first connecting member 132 is provided on the handrail tube 130 near the elongated hole 131, and the first connecting member 132 is fixedly connected to the handrail tube 130. The first connecting member 132 can be received in the first sliding groove 121 and can slide therein. For example, the fixed base 120 may be provided with two first sliding grooves 121, symmetrically arranged relative to the centerline C1 of the fixed base 120, respectively corresponding to the first connecting member 132 of each handrail tube 130 on either side. Optionally, as shown in FIG3A , a first connector 132 disposed at the other end of the handrail tube 130 is spaced apart from the elongated hole 131 (and the first fastener 101 received therein). For example, the first connector 132 is disposed farther away from the end of the handrail tube 130 connected to the column 110 than the elongated hole 131. In one example, the first connector 132 may be a pin, a rivet, a screw, etc., but the present disclosure is not limited thereto.

[0163] Specifically, further referring to Figures 2 to 4A , the first connector 132 has a locked position and a released position in the first sliding slot 121. When the first connector 132 is in the locked position (see Figure 2 ), the armrest tube 130 is locked relative to the fixing base 120 and the column 110, i.e., it cannot pivot relative to the fixing base 120 and / or the column 110. When the first connector 132 is in the released position (see Figure 4A ), the armrest tube 130 can pivot relative to the fixing base 120 and the column 110 to facilitate folding the collapsible crib 100.

[0164] In one example, as shown in FIG5 , the first sliding slot 121 may include a first slot section 121a and a second slot section 121b. The first slot section 121a is parallel to the longitudinal direction of the handrail tube 130 in the deployed state (i.e., the direction in which the handrail tube 130 extends in the deployed state), while the second slot section 121b is arranged at an angle relative to the first slot section 121a. Optionally, the second slot section 121b extends downward from one end (e.g., the outer end) of the first slot section 121a and forms an outwardly curved arc. Specifically, one end of the arc is located at the outer end of the first slot section 121a, while the other end extends further outward (outward in the transverse direction D1) relative to the outer end. For example, the second slot sections 121b of the two first sliding slots 121 may form a splayed configuration. The two opposing ends of the first slot section 121a (i.e., the inner and outer ends in the transverse direction of the fixing base 120) define the locking and unlocking positions of the first connector 132. Specifically, the end of the first slot segment 121a away from the second slot segment 121b (e.g., the inner end) corresponds to the locked position, while the end of the first slot segment 121a where it connects to the second slot segment 121b (e.g., the outer end) corresponds to the unlocked position. That is, the second slot segment 121b connects to the first slot segment 121a at the end of the first slot segment 121a corresponding to the unlocked position. In other examples, the second slot segment 121b is linear, in which case the length of the elongated hole 131 needs to be longer.

[0165] Furthermore, the armrest tube 130 and the fixed base 120 of the present disclosure are not limited to the connection method described above. In other examples, both ends of the armrest tube 130 can be pivotally connected to the fixed base 120 via a single pivot point. That is, the other end of the armrest tube 130 can also be pivotally connected to the fixed base 120 in a non-sliding manner. Another rod (or tube) is also provided on the underside of the armrest tube 130, pivotally and slidably connected to the fixed base 120. The ends of this other rod (or tube) are provided with two connecting members, which respectively connect to the first sliding groove 121 and the elongated hole 131 to achieve locking and unlocking of the armrest tube 130.

[0166] As shown in Figures 3A to 4A, the linkage mechanism 150 can be configured to assist in the folding and unfolding of the foldable crib 100, specifically, to drive the armrest tube 130 to lock and unlock. The linkage mechanism 150 can be movably disposed on the armrest tube 130, for example, at least a portion thereof can be slidably disposed relative to the armrest tube 130. One end of the linkage mechanism 150 can be pivotally connected to the column mechanism, and the other end of the linkage mechanism 150 can be pivotally connected to the fixed base 120. For example, one end of the linkage mechanism 150 can be pivotally connected to the top corner piece 140 (or the column 110) of the column mechanism (see the fifth pivot point P5 in Figure 3A), while the other end can be pivotally connected to the fixed base 120 via a second fastener 102 (see the sixth pivot point P6 in Figure 3A), where the second fastener 102 can be fixed to the fixed base 120. In one example, the linkage mechanism 150 can include a linkage rod 151 and linkage members 152 and 153. The connecting rod 151 extends in a direction parallel to the handrail tube 130, and at least a portion of the connecting members 152 and 153 extends in a direction non-parallel to the connecting rod 151. Optionally, at least a portion of the connecting mechanism 150 is disposed in the handrail tube 130 and is capable of sliding relative to the handrail tube 130. For example, the connecting rod 151 is slidably disposed in the handrail tube 130. The connecting rod 151 can be a tubular member with a hollow structure, or a rod member with a non-hollow structure, but the present disclosure is not limited thereto. The connecting rod 151 can also have other settings, for example, the connecting rod 151 has a hollow structure and is slidably mounted outside the handrail tube 130.

[0167] In one example, in conjunction with Figures 3A and 3B and further referring to Figure 4A, the linkages 152 and 153 may include a first linkage 152 and a second linkage 153. The first linkage 152 and the second linkage 153 are respectively connected to the two ends of the linkage rod 151. Specifically, one end of the first linkage 152 is pivotally connected to the column mechanism, specifically to the top corner piece 140 or the column 110 of the column mechanism, as shown in the fifth pivot point P5 in Figure 3A. Furthermore, the fifth pivot point P5 and the third pivot point P3 (i.e., the pivot point between the handrail tube 130 and the column mechanism) may be spaced apart in the vertical direction D3. Optionally, the fifth pivot point P5 and the third pivot point P3 may also be spaced apart in the transverse direction (or horizontal direction) D1. The other end of the first linkage 152 is pivotally connected to the first end of the linkage rod 151, as shown in the first pivot point P1 in Figure 3A. One end of the second linking member 153 is pivotally connected to the fixing base 120, for example, via the second fastener 102, to a sixth pivot point P6. Furthermore, the sixth pivot point P6 and the fourth pivot point P4 (i.e., the pivot point between the handrail tube 130 and the fixing base 120) may be spaced apart in the vertical direction D3. Alternatively, the sixth pivot point P6 and the fourth pivot point P4 may also be spaced apart in the transverse direction D1. The other end of the second linking member 153 is pivotally connected to the second end of the connecting rod 151, as shown in FIG3A at the second pivot point P2.

[0168] When the foldable crib 100 switches from the expanded state to the folded state, or vice versa, the linkage rod 151 moves relative to the armrest tube 130, such as by sliding within the armrest tube 130, causing the positions of the first pivot point P1 and the second pivot point P2 relative to the armrest tube 130 to continuously change in a direction parallel to the armrest tube 130. For example, the positions of the first pivot point P1 and the second pivot point P2 when the crib 100 is in the folded state are further away from the connection between the armrest tube 130 and the column mechanism, such as the location of the top corner fitting 140, than when the crib 100 is in the expanded state. Specifically, in this embodiment, during the transition from the expanded state to the folded state, the first pivot point P1 and the second pivot point P2 move further away from the connection between the armrest tube 130 and the column mechanism, in other words, they move closer to the connection between the armrest tube 130 and the fixing base 120. In other embodiments, during the transition of the crib 100 from the expanded state to the folded state, the first pivot point P1 and the second pivot point P2 may also have opposite position changes relative to the armrest tube 130 .

[0169] In this embodiment, since at least a portion of the first linkage 152 extends non-parallel to the armrest tube 130, when the first pivot point P1 moves relative to the armrest tube 130 away from the connection between the armrest tube 130 and the column mechanism, the linkage mechanism 150 pivots together with the armrest tube 130, thereby achieving the final folding of the crib 100. Specifically, in this embodiment, due to the vertical (i.e., vertical direction D3) relative positional relationship between the first linking member 152 and the armrest tube 130, the horizontal relative positional relationship between the locked and unlocked positions of the armrest tube 130 (such as the first connecting member 132 fixedly disposed at one end thereof) in the first sliding slot 121, and the locking and unlocking achieved through the shape and configuration of the armrest tube 130 or the linking member and their shape matching with the first sliding slot 121, during the above-described process, the end of the linking mechanism 150 connected to the fixing base 120 and the end of the armrest tube 130 connected to the fixing base 120 can pivot downward together to achieve folding of the crib 100. Furthermore, by modifying or combining the above-described factors, the same or other pivoting configurations of the linking mechanism 150 and the armrest tube 130 can also be achieved, which will not be further described in this disclosure.

[0170] Optionally, slots are provided at positions corresponding to the first end (i.e., the end connected to the first link 152) and the second end (i.e., the end connected to the second link 153) of the linkage rod 151 on the handrail tube 130, allowing the first link 152 and the second link 153 to extend from the handrail tube 130. Specifically, as shown in FIG3A , the slots may be provided on the underside of the handrail tube 130, allowing the first link 152 and the second link 153 to extend from below the handrail tube 130 and avoid the first link 152 and the second link 153 when the linkage rod 151 moves relative to the handrail tube 130.

[0171] In one example, the lines connecting the first pivot point P1, the third pivot point P3, and the fifth pivot point P5 form a first triangle T1, and the lines connecting the second pivot point P2, the fourth pivot point P4, and the sixth pivot point P6 form a second triangle T2. As the foldable crib 100 switches between the expanded and folded states, the angles of the first and second triangles T1 and T2 continuously change.

[0172] Specifically, as shown in Figures 3C and 4B, in the first triangle T1, the angle between the line connecting the pivot points P1 and P3 and the line connecting the pivot points P1 and P5 (i.e., the angle of the first triangle T1 at the first pivot point P1) is angle α1, the angle between the line connecting the pivot points P1 and P3 and the line connecting the pivot points P3 and P5 (i.e., the angle of the first triangle T1 at the third pivot point P3) is angle α3, and the angle between the line connecting the pivot points P3 and P5 and the line connecting the pivot points P1 and P5 (i.e., the angle of the first triangle T1 at the fifth pivot point P5) is angle α5. Correspondingly, in the second triangle T2, the angle between the line connecting the pivot points P2 and P4 and the line connecting the pivot points P2 and P6 (i.e., the angle of the second triangle T2 at the second pivot point P2) is angle α2, the angle between the line connecting the pivot points P2 and P4 and the line connecting the pivot points P4 and P6 (i.e., the angle of the second triangle T2 at the fourth pivot point P4) is angle α4, and the angle between the line connecting the pivot points P2 and P6 and the line connecting the pivot points P4 and P6 (i.e., the angle of the second triangle T2 at the sixth pivot point P6) is angle α6.

[0173] Further referring to Figures 3A, 3C, 4A, and 4B, when the crib 100 switches from the expanded state shown in Figure 3A to the collapsed state shown in Figure 4A, angle α3 of the first triangle T1 and angle α6 of the second triangle T2 gradually decrease, angle α5 and angle α4 gradually increase, and angle α1 and angle α2 first increase and then decrease. When the crib is in the expanded state, angle α3 can be an obtuse angle or a right angle. When the crib 100 needs to be collapsed, the armrest tube 130 is unlocked relative to the fixing base 120, that is, the first connecting member 132 moves from the locked position to the unlocked position in the first sliding groove 121, causing angle α1 to increase, angle α3 to decrease, and angle α5 to increase, while causing angle α2 to increase, angle α4 to increase, and angle α6 to decrease. At this point, the upright post 110 (and its top corner piece 140) can pivot relative to the armrest tube 130, and the armrest tube 130 can pivot relative to the fixing base 120. As the upright post 110, armrest tube 130, and fixing base 120 retract relative to each other, the linkage rod 151, under the action of the first linkage piece 152 and the second linkage piece 153, moves relative to the armrest tube 130 toward the fixing base 120, causing angle α3 to further decrease, angle α5 to further increase, angle α4 to further increase, and angle α6 to further decrease, until the crib 100 is fully folded. During this period, angles α1 and α2 will first increase and then decrease.

[0174] In conjunction with Figures 3A to 4A, optionally, the foldable crib 100 may further include a synchronization component 170. In this embodiment, four synchronization components 170 are provided, and each synchronization component 170 corresponds to an armrest mechanism. The synchronization component 170 includes two synchronization members 171 and 172 arranged in a cross-like manner. One end of each of the two synchronization members 171 and 172 is pivotally connected to an armrest tube 130, and the other end of each of the two synchronization members can be pivotally and slidably connected to the fixed base 120. Specifically, the synchronization members 171 and 172 may include a first synchronization member 171 and a second synchronization member 172, and the first synchronization member 171 and the second synchronization member 172 intersect each other and are symmetrically arranged relative to the center line C1 of the fixed base 120 in the transverse direction, that is, the intersection of the first synchronization member 171 and the second synchronization member 172 is located on the center line C1.

[0175] In this embodiment, the first synchronizer 171 and the second synchronizer 172 have the same structure and are arranged crosswise and symmetrically with each other. For example, the first synchronizer 171 and the second synchronizer 172 can be elongated sheet-like members. For ease of explanation, the following description will mainly take the first synchronizer 171 as an example. One end of the first synchronizer 171 is pivotally connected to the handrail tube 130 via the first connecting member 132, and the other end thereof is pivotally and slidably connected to the fixed seat 120 via the second fastener 102. As shown in Figures 3A to 4A, the first synchronizer 171 can be provided with a second sliding groove 171a and a third sliding groove 171b. In one example, the third sliding groove 171b is arranged spaced apart from the second sliding groove 171a. For example, the third sliding groove 171b can be located at or near the end of the first synchronizer 171 pivotally connected to the handrail tube 130, while the second sliding groove 171a can be provided at the other end of the first synchronizer 171 (i.e., the end opposite the end pivotally connected to the handrail tube 130). Specifically, the second sliding groove 171a is provided near the connection between the second linking member 153 and the fixed base 120. Optionally, the second fastener 102 on the fixed base 120 (wherein the second linking member 153 is pivotally connected to the fixed base 120 via the second fastener 102) is provided in the second sliding groove 171a and is capable of sliding and pivoting relative to the second sliding groove 171a, as shown in the sixth pivot point P6. In other words, the first synchronizer 171 is slidably and pivotally connected to the lower end of the fixed base via the second fastener 102. However, the second fastener 102 may not pass through the second sliding slot 171 a. For example, an additional fastener may be provided to pass through the second sliding slot 171 a so as to enable the first synchronizer 171 to be slidably and pivotally connected to the lower end of the fixing seat.

[0176] In addition, the two third sliding grooves (i.e., the third sliding groove 171b of the first synchronizer 171 and the third sliding groove 172b of the second synchronizer 172) can be arranged crosswise. For example, during the folding or unfolding process of the foldable crib 100, the intersection of the two third sliding grooves can always be located at the center line C1 of the fixed base 120. Optionally, a third fastener 103 is provided at the intersection of the two third sliding grooves, and the first synchronizer 171 and the second synchronizer 172 can both pivot and slide relative to the third fastener 103. In one example, a guide groove 122 can be provided on the fixed base 120, and the third fastener 103 is disposed in the guide groove 122 and can move in the guide groove 122. Optionally, the guide groove 122 can extend in the vertical direction of the fixed base 120. Additionally or alternatively, the guide groove 122 can extend along the center line C1 of the fixed base 120. When the handrail tube 130 is pivoted and retracted relative to the fixing base 120 , the third fastening member 103 can slide in the guide groove 122 .

[0177] In other words, the third fastener 103 can pass through the third sliding grooves provided on the first and second synchronizers 171, 172 and the guide groove 122 provided on the fixed base 120, and can slide within the guide groove 122. As shown in FIG3B , when the armrest tube 130 is locked relative to the fixed base 120, that is, when the crib 100 is in the deployed state, the third fastener 103 is located at the uppermost end of the guide groove 122 and at the end of the third sliding groove 171b closest to the first connecting member 132 (that is, the end where the first synchronizer 171 is connected to the armrest tube 130). As shown in FIG4A , when the armrest tubes 130 are retracted relative to each other, that is, pivoted relative to the fixed base 120 to a position close to each other, the third fastener 103 is located at the lowermost end of the guide groove 122 and at the end of the third sliding groove 171b farthest from the first connecting member 132.

[0178] Specifically, during the folding process of the crib 100, as the armrest tube 130 pivots relative to the upright 110 and the fixing base 120, the linkage rod 151 moves within the armrest tube 130 toward the fixing base 120, and the second linkage member 153 pivots relative to the fixing base 120. This allows the second fastener 102, pivoted between the second linkage member 153 and the fixing base 120, to slide within the second sliding groove 171a of the first synchronizer 171, for example, toward a position further away from the end pivotally connected to the armrest tube 130, thereby driving the first synchronizer 171 to pivot and move relative to the fixing base 120. At this time, the third fastener 103 also synchronously slides within the third sliding groove 171b in the same direction as the second fastener 102 slides within the second sliding groove 171a. During the folding process of the crib 100, the ends of the armrest tubes 130 on both sides of the fixing base 120 move from the first groove section 121a to the second groove section 121b, and the ends of the armrest tubes 130 on both sides drive the first connecting members 132 on both sides to move downward relative to the fixing base 120, thereby causing the first and second synchronizing members 171, 172 to rotate downward, and drive the third fastening member 103 to move downward along the guide groove 122. Since the third fastening member 103 always abuts the uppermost end of the third sliding grooves 171b, 172b during the pivoting process, the first and second synchronizing members 171, 172 always rotate downward synchronously, so that the armrest tubes 130 on both sides always fold synchronously.

[0179] 6A and 6B are partial perspective views of the armrest mechanism according to the first embodiment of the present disclosure, wherein the outer shell of the fixing base 120 is removed in FIG. 6A so as to illustrate the internal structure of the fixing base 120 from the front side thereof.

[0180] In a specific example, referring to Figures 6A and 6B, each of the first synchronizer 171 and the second synchronizer 172 can have a single-layer sheet structure and at least partially penetrate the corresponding handrail tube 130. For example, at least a portion of each of the first synchronizer 171 and the second synchronizer 172 can extend from the corresponding handrail tube 130. More specifically, the end of the handrail tube 130 connecting to the first synchronizer 171 and / or the second synchronizer 172 can be provided with a notch to accommodate and avoid the movement trajectory of the first synchronizer 171 and / or the second synchronizer 172.

[0181] In addition, as shown in Figures 6A and 6B, the armrest mechanism may also be provided with a wear-resistant part 104 to prevent or at least reduce friction between the various components and / or to limit the various components. In one example, the third fastener 103 may be provided with a wear-resistant part 104, for example, sleeved on the third fastener 103, to prevent or at least reduce friction with the first synchronizer 171 and / or the second synchronizer 172 and / or the second linkage 153, and / or to limit them. Optionally, the wear-resistant part 104 provided on the third fastener 103 can space the first synchronizer 171 and the second synchronizer 172 apart from each other in the extension direction of the third fastener 103. Optionally, the wear-resistant part 104 can be a washer, but the present disclosure is not limited to this.

[0182] Figures 7 through 9 illustrate the folding process of the foldable crib 100 of the present disclosure. To facilitate illustration of the structural changes in the armrest mechanism during folding, the bottom frame 180 and feet 190 are not shown in Figures 7 through 9. Specifically, Figures 7 through 9 illustrate the states and relative positions of the armrest mechanism and uprights 110 during the unfolded state, during the folding process, and after folding, respectively.

[0183] 1 , 3A , 4A , and 7 to 9 , when the crib 100 needs to be folded, the user can operate the base 182 to fold it. Specifically, as shown in FIG1 , the user can pull the base 182, for example, with an upward force F, to cause the bottom bar 181 to pivot relative to the base 182, thereby driving the bottom of the upright 110 to move inward. In this embodiment, the user can pull the base 182 upward with a single hand. However, it should be understood that in other embodiments, the direction of the force applied to the base 182 can be changed, such as downward, and this is not detailed in this disclosure.

[0184] At this point, referring to Figures 3A, 7, and 8, because the linkage mechanism 150 is connected to the corner fitting 140 and the fixing base 120, respectively, and cannot produce relative horizontal displacement, as the bottom of the column 110 moves inward, the upper end of the column 110, together with the corner fitting 140, pivots outward about the pivot point P5 between the linkage mechanism 150 and the corner fitting 140. At this point, the armrest tube 130 is also driven outward by the corner fitting 140, causing the first connector 132 at the end of the armrest tube 130 to move outward along the first slot section 121a to the unlocking position of the first slot section 121a, thereby releasing the armrest tube 130. As the folding process continues, the first connector 132 slides within the second slot section 121b, causing the armrest tube 130 to pivot relative to the corner fitting 140 and the fixing base 120, ultimately completing the folding of the crib 100 (see Figures 4A and 9). Optionally, the synchronous folding of the handrail tubes 130 on both sides of the fixing seat 120 can be achieved through the synchronization component 170, making the folding process smoother.

[0185] Fig. 10 is a perspective view of a foldable baby crib 200 according to a second embodiment of the present disclosure. Fig. 11A and Fig. 11B are perspective views of the upright column 210 and the foot 290 shown in Fig. 10 in different states, respectively.

[0186] As shown in FIG10 , a foldable baby crib 200 according to a second embodiment of the present disclosure is provided. The column mechanism of the foldable baby crib 200 may include a column 210 and a foot 290 .

[0187] 11A and 11B , a foot 290 can be pivotally connected to the column 210. In one example, the foot 290 can be disposed at the lower end of the column 210 and can pivot relative to the column 210, thereby reducing the packaging volume. A bottom bar 281 is connected to the foot 290, for example, by a fastener. When the bottom bar 281 pivots and retracts, the bottom bar 281 drives the foot 290 to pivot relative to the column 210 (see FIG. 11B ), so that the column mechanism is reduced in size, at least in the vertical direction, after being retracted. This can reduce the packaging volume and facilitate transportation.

[0188] Preferably, the foot 290 may include a receiving recess 291 and a rolling member 292 at least partially accommodated in the receiving recess 291. The rolling member 292 is at least partially exposed from the receiving recess 291, that is, it at least partially protrudes from the receiving recess 291. When the bottom bar 281 is in the unfolded position (see Figure 11A), the bottom surface of the foot 290 is on the ground, and the rolling member 292 does not contact the ground, and thus does not move the crib 100. When the bottom bar 281 is pivoted and folded, the foot 290 pivots relative to the column 210 (see Figure 11B), for example, when it pivots inward, the rolling member 292 contacts the ground to assist in folding, making the folding process smoother. In one example, the rolling member 292 can be a wheel, but the present disclosure is not limited to this.

[0189] As shown in FIG. 10 , a support member 283 may be further provided on the bottom frame 280 , for example, on the base 282 , so that the foldable crib 100 can be more stably supported on the ground in the unfolded state.

[0190] Figures 12A and 12B are partially exploded views of an armrest mechanism according to a second embodiment of the present disclosure. Specifically, Figure 12A removes the outer shell of the mounting base 220 to illustrate its internal structure, while Figure 12B further removes the armrest tube 230 on one side of the mounting base 220 and the first fixing member 223 shown in Figure 12A.

[0191] With reference to Figures 10 and 12A, a first fixing member 223 may also be provided on the armrest mechanism (e.g., the fixing base 220). The first fixing member 223 may be fixedly connected to the fixing base 220, for example, by a second fastener 202, and may be disposed within the cavity of the fixing base 220 (e.g., the fixing base 220 may be sleeved on the outside of the first fixing member 223) to separate the side wall of the fixing base 220 (i.e., the inner side wall of the shell) from the first synchronizer 271 and / or the second synchronizer 272, thereby positioning the first synchronizer 271 and / or the second synchronizer 272 to ensure that they move smoothly and without shaking. Optionally, the first fixing member 223 may also separate the side wall of the fixing base 220 from the various components of the linkage mechanism. In one example, the first fixing member 223 may be made of materials such as plastic, resin, and plastic.

[0192] For example, as shown in FIG12A , the first fixing member 223 may include a transverse section 223a extending along the transverse direction D1 and, optionally, a vertical section 223b extending along the vertical direction D3. The ends of the transverse section 223a may be fixed to the fixing base (see “220” in FIG10 ) via second fasteners 202 . One end of the vertical section 223b may be fixedly connected to one side of the transverse section 223a , for example, the upper side of the transverse section 223a . In other words, the vertical section 223b may extend upward from the upper side of the transverse section 223a . The other end of the vertical section 223b is disposed between adjacent ends of two handrail tubes 130 connected to the same fixing base 120 . Furthermore, a through-hole 223c may be provided in the vertical section 223b . The through-hole 223c can be arranged to penetrate the first fixing member 223 along the thickness direction (e.g., longitudinal direction D2) of the first fixing member 223. Furthermore, the third fastener 203, which passes through the guide groove of the fixing seat 220 and the third sliding grooves of the two synchronizers, can also pass through the through-hole 223c of the vertical section 223b. In one example, the first fixing member 223 can be an integrally formed component, i.e., the transverse section 223a and the vertical section 223b are integrally formed.

[0193] Optionally, the first fixing member 223 may have a multi-layer structure, for example, having multiple layers spaced apart from each other in its thickness direction, and the second linking member 253, the first synchronizing member 271 and the second synchronizing member 272 connected to the fixing seat 120 may be respectively located in different intervals formed by different adjacent layers, thereby separating the side wall of the fixing seat 220 located outside the first fixing member 223 from the first synchronizing member 271, the second synchronizing member 272 and / or the second linking member 253, thereby positioning these components and improving the smoothness of movement therebetween.

[0194] Optionally or alternatively, the first fixing member 223 may be integrally formed with the fixing base 220. For example, the fixing base 220 may be formed as an integrally formed structure having a plurality of spacer layers therein.

[0195] In addition, as shown in Figures 12A and 12B, a second fixing member 224 may also be provided on the armrest mechanism. The second fixing member 224 is fixedly connected to the armrest tube 230, and one end thereof (i.e., the end located at or near the end where the armrest tube 230 is connected to the fixing base 220) is provided with an opening. Specifically, the opening can be configured to extend outward from the end of the second fixing member 224 by a distance to form a space for accommodating the first synchronizer 271 and / or the second synchronizer 272. In one example, a first connecting opening 224b and a second connecting opening 224c spaced apart from each other may be provided in the opening of the second fixing member 224 to respectively accommodate the upper ends of the first synchronizer 271 and the second synchronizer 272, thereby separating the two. Optionally, the second fixing member 224 may include a shape adaptor 224a, which is disposed in the opening and has a first connecting opening 224b to adapt to the shape of the first synchronizer 271 at the opening. The portion of the opening excluding the shape adaptor 224a forms a second connecting opening 224c. The shape adaptor 224a can be fixedly connected to the opening or integrally formed with the rest of the second fixing member 224, i.e., the second fixing member 224 is a one-piece structure. Optionally or alternatively, the second fixing member 224 can be integrally formed with the handrail tube 230; and / or the second fixing member 224 can be made of materials such as plastic, resin, or plastic glue.

[0196] 13 is a perspective view of an armrest mechanism according to a third embodiment of the present disclosure.

[0197] As shown in FIG13 , unlike the previous embodiment, the linkage mechanism 350 can also be an auxiliary tube 351 disposed parallel to the handrail tube 330. Specifically, one end of the auxiliary tube 351 can be pivotally connected to the column mechanism, i.e., the column 310 or the top corner fitting 340 fixedly connected to the column 310, and the other end of the auxiliary tube 351 can be pivotally connected to the fixing base 320.

[0198] Referring to Figures 14A to 14C, Figure 14A is a perspective view of an armrest mechanism according to a fourth embodiment of the present disclosure, Figure 14B is the armrest mechanism shown in Figure 14A viewed from another angle, and Figure 14C is another perspective view of the armrest mechanism shown in Figure 14A with the fixing base 420 removed to illustrate its internal structure. Furthermore, Figure 15 is a perspective view of a first synchronizer 471 according to a fourth embodiment of the present disclosure.

[0199] In a fourth embodiment of the present disclosure, an armrest mechanism may include a fixed base 420, an armrest tube 430, and a linkage mechanism 450. Similar to the previous embodiments (e.g., the first embodiment), the linkage mechanism 450 may be configured to assist in the folding and unfolding of the foldable crib. That is, the linkage mechanism 450 may be configured to drive the armrest tube 430 to move when the column mechanism (not shown) moves (e.g., pivots). One end of the linkage mechanism 450 may be pivotally connected to the column mechanism, while the other end of the linkage mechanism 450 may be movably connected to the fixed base 420, for example, by a second fastener 402, such as being pivotally connected and optionally slidably connected to the fixed base 420.

[0200] As shown in FIG14A , in this embodiment, a linkage mechanism 450 may be disposed on the handrail tube 430, with at least a portion thereof being slidable relative to the handrail tube 430. Specifically, the linkage mechanism 450 may include a linkage rod 451, a first linkage member 452, and a second linkage member 453. The linkage rod 451 may extend parallel to the handrail tube 430, while at least a portion of each of the first linkage member 452 and the second linkage member 453 may extend non-parallel to the handrail tube 430. One end of each of the first linkage member 452 and the second linkage member 453 is pivotally connected to opposite ends of the linkage rod 451, respectively. The other end of the first linkage member 452 is pivotally connected to the column mechanism, while the other end of the second linkage member 453 is pivotally connected to the fixed base 420, so as to pivot as the linkage rod 451 slides on the handrail tube 430. Alternatively, the linkage rod 451 in this embodiment may have a tubular structure and be slidably mounted on the outside of the handrail tube 430. For example, the connecting rod 451 can be a plastic sleeve with a hollow structure that is sleeved on the outside of the handrail tube 430, but the present disclosure is not limited to this. The connecting rod 451 can also be made of other materials, or have other shapes that can be slid outside the handrail tube 430 and relative to the handrail tube 430.

[0201] Referring to Figures 14B and 14C , this embodiment may also include a synchronization assembly 470 to synchronize the folding and unfolding of the armrest mechanisms at both ends of the fixed base 420. The synchronization assembly 470 includes a first synchronization member 471 and a second synchronization member 472 (hereinafter referred to as "synchronization members") arranged in a cross pattern. The first synchronization member 471 and the second synchronization member 472 each have one end pivotally connected to the armrest tube 430 and their other ends movably (e.g., pivotally and slidably) connected to the fixed base 420.

[0202] Further referring to Figures 14B, 14C, and 15, the synchronization assembly 170 of this embodiment differs from the first embodiment in that the synchronization members 471 and 472 of this embodiment can have a width in the diametrical direction of the handrail tube 430 to provide a more stable connection between the handrail tube 430 and the synchronization members 471 and 472. For example, taking the first synchronization member 471 as an example, the first synchronization member 471 can include two parallel sheet members. Specifically, the first synchronization member 471 can include a first sheet member 471c, a second sheet member 471d, and a connecting piece 471e connecting the first and second sheet members 471c and 471d. The first and second sheet members 471c and 471d are respectively located on opposite sides of the handrail tube 430 in the diametrical direction. The connecting piece 471e spans the diameter of the handrail tube 430 to connect the first and second sheet members 471c and 471d into a single piece. In one example, the connecting piece 471e can be disposed on the bottom sides of the first and second sheet members 471c, 471d, and optionally, can extend along a portion of the bottom sides of the first and second sheet members 471c, 471d. Optionally, the first synchronizer 471 is a one-piece structure. Optionally or alternatively, the first sheet member 471c, the second sheet member 471d, and the connecting piece 471e of the first synchronizer 471 are separate components that are assembled together. The second synchronizer 472 can have the same structure as the first synchronizer 471 and be disposed in a mirror-image relationship with the first synchronizer 472, which will not be described in detail here. Regarding the specific connection between each sheet member in the synchronizers 471 and 472 and the fixed seat 420, the handrail tube 430, and / or the linkage mechanism 450, please refer to the synchronizer assembly 170 described in the first embodiment above. The difference is that the sheet members of this embodiment are disposed on both sides of the handrail tube 430 along its diameter, rather than being disposed through the handrail tube 430.

[0203] In one example, as shown in Figure 14C, the first linking member 452 and / or the second linking member 453 may have a width in the diameter direction of the handrail tube 430 (i.e., have a widened shape) to adapt to the width of the first synchronizer 471 and / or the second synchronizer 472, so as to be more stably connected (e.g., clamped) between the two sheet members of the first synchronizer 471 and / or the second synchronizer 472.

[0204] By designing such synchronizers 471, 472 and / or linkages 452, 453, the various structures of the armrest mechanism and their connection to the synchronizer assembly 470 are more stable, preventing forward and backward shaking during sliding and / or pivoting. Furthermore, based on the design of this embodiment, the wear-resistant member 104 (such as a washer) described in the first embodiment can be omitted, resulting in a simpler structure and easier assembly.

[0205] 16 and 17A and 17B , FIG. 16 is a perspective view of a linkage rod 551 according to a fifth embodiment of the present disclosure, and FIG. 17A and 17B are perspective views of the linkage rod 551 shown in FIG. 16 installed in a foldable crib 500 .

[0206] 16 to 17B , the connecting rod 551 may have a tubular structure that is sleeved onto the outside of the armrest tube 530. In this embodiment (as a variation of the fourth embodiment), a notch 551a may be provided along the length of the connecting rod 551 to expose at least a portion of the armrest tube 530 from the tubular structure of the connecting rod 551, thereby leaving space for the accessory 505 to connect. This allows the accessory 505 to engage with the armrest tube 530 when the crib is unfolded, specifically, to engage with the armrest tube 530 exposed through the notch 551a. Furthermore, as shown in FIG17A and FIG17B , the armrest tube 530 may also be provided with a fixing portion 530a for fixing the accessory 505. In one example, the fixing portion 530a can be located at a position of the handrail tube 530 corresponding to the notch 551a, that is, when the connecting rod 551 is installed on the handrail tube 530, the fixing portion 530a can be exposed through the notch 551a. For example, the fixing portion 530a can be a hole or a recess for the corresponding structure of the accessory 505 to engage. In this embodiment, the fixing portion 530a is an elongated recess that extends along the length direction of the handrail tube 530. And two fixing portions 530a are provided on each handrail tube 530, and the two fixing portions 530a are spaced apart and arranged side by side along the length direction of the handrail tube 530. However, the present disclosure is not limited to this, and the fixing portion 530a can also have other structures according to the requirements of the accessory 505.

[0207] It should be noted that, in the absence of structural conflict, the relevant structures in the aforementioned first to fifth embodiments of the present disclosure can be used optionally, in combination, or alternatively. For example, the armrest mechanism of the fourth embodiment and / or the fifth embodiment of the present disclosure can replace the armrest mechanism or a part thereof as described in the first embodiment to be used in the foldable crib 100; and / or, the corresponding structure described in the second embodiment and / or the third embodiment can be adopted, which is not described in detail here.

[0208] Referring to Figures 18 to 21, Figure 18 is a front view of the armrest mechanism of the foldable crib according to the sixth embodiment of the present disclosure; Figure 19A is another front view of the armrest mechanism shown in Figure 18, wherein the front fixing seat 620 is removed to show the structure of the synchronization assembly 670; Figure 19B is an enlarged view of part B shown in Figure 19A; Figure 19C is a three-dimensional view of the synchronization assembly shown in Figure 19A; Figures 20A and 20B are respectively partial views of the foldable crib shown in Figure 19A when in a folded state, to show the synchronization assembly and the structure connected thereto; and Figure 21 is a front view of the fixing seat 620 shown in Figure 18.

[0209] The foldable crib of this embodiment may include a column mechanism and an armrest mechanism, wherein the armrest mechanism is connected between the column mechanisms, for example, between the upper ends or top ends of the two column mechanisms. The column mechanism may include a column 610, and if there is no structural conflict, the specific structure of the column mechanism and its connection with the armrest mechanism (and optional bottom frame) may be similar to any of the aforementioned embodiments, and thus will not be described in detail here.

[0210] 18 to 19B , the armrest mechanism includes a fixed base 620, an armrest tube 630, and a linkage mechanism 650. The armrest tube 630 is disposed on both sides of the fixed base 620 in the transverse direction, for example, symmetrically disposed at both ends of the fixed base 620 relative to the center line C6 of the fixed base 620. Specifically, as shown in FIG18 , one end of the armrest tube 630 is pivotally connected to the column mechanism (including the column 610 and the optional top corner piece 640), while the other end thereof is movably connected (e.g., pivotally connected) to the fixed base 620 via, for example, a first fastener 601. In one example, in conjunction with FIG18 and FIG19A , the armrest tube 630 is slidably pivoted to the fixed base 620. Optionally, an elongated hole 631 may be provided at one end of the armrest tube 630 connected to the fixing base 620 (i.e., the "other end" of the armrest tube 630). The elongated hole 631 may extend in the longitudinal direction of the armrest tube 630, so that the first fastener 601 fixed to the fixing base 620 can be slidably inserted into the elongated hole 631, thereby enabling the armrest tube 630 to pivot and slide relative to the fixing base 620. In a specific example, with reference to Figures 19A and 20A, when the armrest mechanism is in the deployed state, the first fastener 601 is located at the end of the elongated hole 631 that is closer to the column mechanism (i.e., the first end); and when the armrest mechanism is in the retracted state, the first fastener 601 is located at the end of the elongated hole 631 that is farther from the column mechanism (i.e., the second end). With respect to other structures of the armrest tube 630 and the linkage mechanism 650, reference may be made to the corresponding structures of any one or more of the aforementioned embodiments (such as the first embodiment or the fourth embodiment), and no further description is given here.

[0211] In conjunction with Figures 18, 19A, and 21, a first connecting groove may be provided on the fixed base 620, and a connecting member may be provided corresponding to one end (i.e., the other end) of each handrail tube 630 connected to the fixed base 620. The connecting member can slide relative to the first connecting groove and has a locked position and a released position. Specifically, in this embodiment, the first connecting groove may be configured as a first sliding groove 621 in which the connecting member can slide, and the connecting member may be referred to as a first connecting member 632. The first connecting member 632 can be accommodated in the first sliding groove 621 and can slide in the first sliding groove 621 as the handrail tube 630 is folded and expanded. The first sliding groove 621 is provided on the fixed base 620 near the first fastener 601, and the first connecting member 632 is provided on the handrail tube 630 near the elongated hole 631, and the first connecting member 632 is fixedly connected to the handrail tube 630. For example, the fixing base 620 may be provided with two symmetrically arranged first sliding grooves 621, corresponding to the first connecting members 632 of each of the handrail tubes 630 on either side. Optionally, the first connecting member 632 is disposed farther away from one end of the column mechanism than the elongated hole 631. The first connecting member 632 may be a pin, a rivet, a screw, etc., but the present disclosure is not limited thereto.

[0212] Further referring to FIG. 22A and FIG. 22B , FIG. 22A and FIG. 22B are schematic diagrams of a foldable baby crib in an expanded state and a folded state, respectively, according to a sixth embodiment of the present disclosure.

[0213] Similar to the first embodiment described above, the first connector 632 of this embodiment can also have a locked position and a released position within the first sliding slot 621. When the first connector 632 is in the locked position (see, for example, FIG. 22A ), the armrest tube 630 can be locked relative to the mounting base 620 and the column mechanism. When the first connector 632 is in the released position (see, for example, FIG. 22B ), the armrest tube 630 can pivot relative to the mounting base 620 and the column mechanism (including the column 610) to fold the collapsible crib.

[0214] In a specific example, referring to Figures 21 and 22A and 22B, the first sliding slot 621 of this embodiment may include a first slot section 621a and a second slot section 621b. The first slot section 621a is parallel to the extension direction of the handrail tube 630 when deployed, while the second slot section 621b is arranged at an angle relative to the first slot section 621a. Optionally, the second slot section 621b extends downward from one end (e.g., the outer end) of the first slot section 621a and curves outward. The two opposing ends of the first slot section 621a (i.e., the inner and outer ends in the transverse direction of the fixing base 620) define the locked position (see Figure 22A) and the unlocked position (see Figure 22B) of the first connecting member 632. Specifically, the end of the first slot section 621a facing away from the second slot section 621b (e.g., the inner end) corresponds to the locked position, while the end of the first slot section 621a connecting to the second slot section 621b (e.g., the outer end) corresponds to the unlocked position. In one example, the fixing seat 620 may be provided with two symmetrically arranged first sliding grooves 621 , wherein the two first sliding grooves 621 (especially the second groove sections 621 b thereof) may form a splayed structure.

[0215] In an alternative embodiment, the first sliding groove 621 may not be provided with the first groove section 621 a , and the handrail tube 630 can be locked and released through other structures.

[0216] Referring back to Figures 19A to 20B, the foldable crib may further include a synchronization assembly 670. The foldable crib of the embodiment may be provided with four synchronization assemblies 670, each corresponding to an armrest mechanism. The synchronization assembly 670 includes two synchronization members, which in this embodiment are two synchronization gears, namely, a first synchronization gear 671 and a second synchronization gear 672. The first synchronization gear 671 and the second synchronization gear 672 can rotate synchronously, for example, they are meshed with each other and are respectively linked to an armrest tube 630, so that the two armrest tubes 630 located on both sides of the fixed base 620 can be synchronously folded or unfolded. Specifically, as shown in Figures 19B and 20A, the first synchronization gear 671 can be rotatably connected to the fixed base 620 via a first rotation axis 673 (e.g., centered on the first rotation axis 673), and the second synchronization gear 672 can be rotatably connected to the fixed base 620 via a second rotation axis 674 (e.g., centered on the second rotation axis 674). In a specific example, as shown in Figures 19C and 20B, the first synchronization gear 671 and the second synchronization gear 672 can be respectively composed of two plate gears, and the two plate gears are respectively connected to both sides of the handrail tube 630 along its diameter direction, thereby increasing the connection stability between the synchronization gears 671 and 672.

[0217] Furthermore, as shown in Figures 19A and 19B , the first synchronous gear 671 is provided with a first linkage groove 671a, for example, near the outer diameter of the first synchronous gear 671. Similarly, the second synchronous gear 672 is provided with a second linkage groove 672a, for example, near the outer diameter of the second synchronous gear 672. A first connecting member 632 fixed to the handrail tube 630 can be movably disposed in the first linkage groove 671a and the second linkage groove 672a, respectively, so that rotation of the corresponding handrail tube 630 can drive the rotation of the first synchronous gear 671 and / or the second synchronous gear 672, thereby driving the other synchronous gear through the linkage between the first synchronous gear 671 and the second synchronous gear 672. In one example, the first linkage groove 671a and / or the second linkage groove 672a can be a through hole or a through hole for the first connecting member 632 to pass through (i.e., passing through the extension portion 671b of the first synchronization gear 671), but the present disclosure is not limited to this. It can also be set to a depression or protrusion that does not pass through the first synchronization gear 671 and / or the second synchronization gear 672 according to the shape or structure of the first connecting member 632.

[0218] Through the above arrangement, the first synchronous gear 671 is rotatably connected to the fixed base 620 through the first rotating shaft 673 as the center, and the second synchronous gear 672 is rotatably connected to the fixed base 620 through the second rotating shaft 674 as the center. The handrail tubes 630 on both sides of the fixed base 620 are respectively pivotally connected to the fixed base 620 through the first fastener 601, and the first connecting members 632 fixed to one end of each of the two handrail tubes 630 are respectively slidably arranged in the first linkage groove 671a and the second linkage groove 672a. Thus, when the handrail tubes 630 can be retracted relative to each other When the first connecting member 632 is in the unlocked position (i.e., the first connecting member 632 is in the unlocked position), the armrest tube 630 rotates, and drives at least one of the synchronous gears (671 and / or 672) through the cooperation of the first connecting groove 671a and / or the second connecting groove 672a and the first fastener 601, and then drives the other synchronous gear (672 and / or 671) to rotate through the engagement between the two synchronous gears 671 and 672, and the other synchronous gear then drives the other corresponding armrest tube 630 to move, thereby realizing the synchronous movement of the two armrest tubes 630 located on both sides of the fixed seat 620.

[0219] In one example, as shown in Figures 19B and 20A, the first linkage groove 671a can be configured to extend in the diametrical direction of the first synchronous gear 671, and the second linkage groove 672a can be configured to extend in the diametrical direction of the second synchronous gear 672, so that the first connecting member 632 can slide in the first linkage groove 671a and / or the second linkage groove 672a along the diametrical direction of the synchronous gears 671 and 672. Specifically, the first synchronous gear 671 can have an extension 671b extending outward from its outer diameter, and at least a portion of the first linkage groove 671a is located on the extension 671b and extends in the diametrical direction of the first synchronous gear 671. Similarly, the second synchronous gear 672 can have a similar structure, which will not be described in detail here. Optionally, the first linkage groove 671a and the second linkage groove 672a are arranged in mirror symmetry. For example, when the armrest mechanism is in the deployed state (see FIG19B ), the first linkage groove 671a and the second linkage groove 672a are respectively located at the upper ends of the first synchronization gear 671 and the second synchronization gear 672. When the armrest mechanism gradually changes from the deployed state to the retracted state (see FIG20B ), the first linkage groove 671a changes with the counterclockwise rotation of the first synchronization gear 671, and synchronously, the second linkage groove 672a changes with the clockwise rotation of the second synchronization gear 672, such that the first linkage groove 671a and the second linkage groove 672a are always mirror-symmetrical with respect to the mutually meshing positions of the synchronization gears 671 and 672. In one example, when the armrest mechanism is in the retracted state, the first linkage groove 671a and the second linkage groove 672a may be located at substantially the same horizontal position, but the present disclosure is not limited thereto.

[0220] Referring to Figures 23A and 23B , Figure 23A is a front view of a synchronization assembly 770 of a foldable crib according to a seventh embodiment of the present disclosure, and Figure 23B is a front view of the synchronization assembly 770 shown in Figure 23A in another state. It should be noted that the synchronization assembly 770 of this embodiment can be applied to other structures of the foldable cribs of the aforementioned embodiments (e.g., the first embodiment or the sixth embodiment), that is, it can serve as an alternative example to the synchronization assembly 770 of the aforementioned embodiments. Therefore, the following description will mainly focus on its structures that differ from the aforementioned embodiments, and other details will not be repeated.

[0221] As shown in Figures 23A and 23B, the synchronization assembly 770 may include two synchronization gears 771 and 772, namely a first synchronization gear 771 and a second synchronization gear 772. The first synchronization gear 771 and the second synchronization gear 772 may each be linked to a handrail tube 730. Specifically, the first synchronization gear 771 and the second synchronization gear 772 may each be rotatably connected to the fixed base 720 via a rotation shaft. In this embodiment, the rotation shaft may be a first fastener 701. The first synchronization gear 771 and the second synchronization gear 772 are connected to each other via a transmission device so that they can rotate synchronously. In one example, the transmission device may be a transmission belt 775, and the transmission belt 775 does not slide relative to the first synchronization gear 771 and the second synchronization gear 772 to ensure synchronization between the two. For example, the transmission belt 775 may be fixedly connected to the first synchronization gear 771 and the second synchronization gear 772. As shown in FIG23A , two transmission belts 775 are provided: one fixedly connected to the upper side of the first synchronous gear 771 and the lower side of the second synchronous gear 772, and the other fixedly connected to the lower side of the first synchronous gear 771 and the upper side of the second synchronous gear 772. Alternatively, the transmission belt 775 may be a belt, chain, or the like. However, it should be understood that the transmission device disclosed herein is not limited to the above structure; any structure capable of achieving synchronized rotation between the first synchronous gear 771 and the second synchronous gear 772 may be employed. For example, the transmission belt 775 may also be a single, cross-shaped transmission belt.

[0222] Further referring to Figures 24 to 28, Figure 24 is a cross-sectional view of the first synchronization gear 771 shown in Figure 23A, Figure 25 is a stereoscopic view of the first synchronization gear 771 shown in Figure 23A, Figures 26A and 26B are front views of the first synchronization gear 771 at different positions on the armrest tube 730, Figure 27 is a partial cross-sectional view of the armrest mechanism of the seventh embodiment of the present disclosure, and Figure 28 is a stereoscopic view of a fixed seat set on the armrest mechanism of the seventh embodiment of the present disclosure.

[0223] 24 , 25 and 27 , a locking mechanism 760 may be provided between the synchronous gears 771 and 772 and the corresponding handrail tubes 730 , so that the rotation of the handrail tubes 730 can drive the synchronous gears 771 and 772 to rotate.

[0224] For example, taking the first synchronous gear 771 as an example (the second synchronous gear 772 can have the same structure and will not be described in detail here), the locking mechanism 760 includes a first mating piece 761 provided on the armrest tube 730 and a second mating piece 762 provided on the first synchronous gear 771. The first mating piece 761 and the second mating piece 762 can movably engage with each other. In one example, as shown in Figures 24 and 27, the first mating piece 761 can be a sliding groove provided on the armrest tube 730. For example, the sliding groove can extend in the length direction of the armrest tube 730. Correspondingly, as shown in Figures 25 and 27, the second mating piece 762 can be a sliding protrusion provided on the first synchronous gear 771.

[0225] Optionally, as shown in FIG25 , two sliding protrusions may be provided on the first synchronous gear 771, and the two sliding protrusions may be provided on a diameter line C7 passing through the center of the first synchronous gear 771. Correspondingly, two sliding grooves may be provided on the handrail tube 730, each corresponding to one of the sliding protrusions. In this way, the handrail tube 730 can be allowed to move outward to release the lock without affecting the fit between the handrail tube 730 and the synchronous gear, and the fit stability between the first synchronous gear 771 and the handrail tube 730 can be increased to improve the synchronization rate of the synchronous rotation with the handrail tube 730. Of course, the two sliding protrusions may not be provided on a diameter line C7 passing through the center of the first synchronous gear 771, but may be provided on a straight line perpendicular to the length direction of the handrail tube without passing through the center of the gear.

[0226] In addition, it should be noted that the positions of the sliding protrusion and the sliding groove described above can be interchanged, or the first mating piece and the second mating piece can also be other forms of structures, such as hook mating, etc., and the present disclosure is not limited thereto.

[0227] Through such a setting, when the armrest tubes 730 need to be folded together, the first mating piece 761 (for example, a sliding groove) provided on the armrest tube 730 drives the first synchronous gear 771 (or the second synchronous gear 772) to rotate through cooperation with the second mating piece 762 (sliding protrusion), and then drives the second synchronous gear 772 (or the first synchronous gear 771) to move synchronously through the transmission device 775, thereby realizing the synchronous rotation and synchronous folding of the armrest tubes 730 on both sides of the fixed seat 720.

[0228] Similar to the previous embodiment, and with reference to Figures 26A to 27 , the handrail tube 730 of this embodiment may also be provided with an elongated hole 731, which may extend in the longitudinal direction of the handrail tube 730. A first fastener 701, serving as a rotation axis and fixed to the fixing base 720, is slidably disposed in the elongated hole 731, allowing the handrail tube 730 to slide relative to the fixing base 720. Specifically, during the folding or unfolding of the handrail tube 730, the handrail tube 730 can move relative to the fixing base 720 through the elongated hole 731. For example, Figure 26A shows a first position of the first synchronization gear 771 (and the first fastener 701, serving as its rotation axis) relative to the elongated hole 731 when the handrail tube 730 is unfolded, while Figure 26B shows a second position of the first synchronization gear 772 (and the first fastener 701) relative to the elongated hole 731 when the handrail tube 730 is folded. The first and second positions may be located at opposite ends of the elongated hole 731. However, during the folding or unfolding process, the relative positions of the first synchronizing gear 771 and the second synchronizing gear 772 remain unchanged.

[0229] Referring to Figures 29 to 31, Figure 29 is a front view of an armrest mechanism of a foldable crib according to an eighth embodiment of the present disclosure; and Figures 30 and 31 are partial enlarged views of the armrest mechanism shown in Figure 29 (specifically, portion C in Figure 29) in different states. For example, the armrest mechanism in Figure 30 is in a locked state, while the armrest mechanism in Figure 31 is in an unlocked state.

[0230] In this embodiment, the foldable crib may include a column mechanism and an armrest mechanism. Specifically, the armrest mechanism may be arranged between the column mechanisms, for example, each armrest mechanism may be connected between two column mechanisms (such as their upper ends or top ends). The column mechanism may include a column 810, and optionally, a top corner piece 840. In the case of no structural conflict, the column mechanism of this embodiment may have a similar structure to the aforementioned embodiments, and may adopt a similar arrangement method (such as connection with the bottom frame, etc.) as the aforementioned embodiments, and therefore will not be described in detail.

[0231] As shown in Figure 29, the armrest mechanism includes a fixed base 820, an armrest tube 830 and a linkage mechanism 850. The armrest tube 830 is arranged on both sides of the fixed base 820 and is connected between the column mechanism and the fixed base 820. In one example, the armrest tube 830 can be arranged to be symmetrically connected to both ends of the fixed base 820 relative to the center line C8 of the fixed base 820 in the transverse direction. The linkage mechanism 850 is used to assist in the folding and unfolding of the foldable crib. One end of the linkage mechanism 850 is pivotally connected to the column mechanism, such as the column 810 and / or the top corner piece 840. The other end of the linkage mechanism 850 is pivotally connected to both ends of the fixed base 820, wherein the connection position between the linkage mechanism 850 and the fixed base 820 and the connection position between the armrest tube 830 and the fixed base 820 can be spaced apart from each other.

[0232] With reference to Figures 29 and 30 , one end of the handrail tube 830 is pivotally connected to the column 810 and / or the top corner piece 840 of the column mechanism, and the other end is movably connected to the fixed base 820, for example, by being pivotally connected to the fixed base 820 via a first fastener 801. The first fastener 801 can be a fastening device fixedly provided on the fixed base 820, such as a screw, a pin, a fastening column, etc. In one example, the handrail tube 830 is slidably pivoted to the fixed base 820, that is, the handrail tube 830 can both slide and pivot relative to the fixed base 820. The specific connection method between the handrail tube 830 and the fixed base 820 will be described below in conjunction with Figures 32 to 34.

[0233] As shown in Figures 30 and 31, the fixing base 820 may be provided with a first connecting groove, and each handrail tube 830 may be provided with a corresponding connecting member at one end connected to the fixing base 820. The connecting member can slide relative to the first connecting groove and has a locked position and a released position. In this embodiment, the first connecting groove may be a first locking groove 821 for locking the connecting member, and the connecting member may be referred to as a second connecting member 833. The second connecting member 833 is fixedly connected to the handrail tube 830. For example, the second connecting member 833 may be a locking pin, a locking rod, a screw, a rivet, etc.

[0234] As shown in FIG31 , the first locking groove 821 can be provided on the edge of the fixing base 820 and, for example, can be configured as a groove or notch extending inward from the edge of the fixing base 820. In one example, when the armrest mechanism is in the deployed position, the first locking groove 821 can be at approximately the same level as the armrest tube 830 (particularly, the second connector 833 provided thereon), so that the second connector 833 fixed to the armrest tube 830 is locked (e.g., snapped) into the first locking groove 821. Specifically, the fixing base 820 can be provided with two symmetrically arranged first locking grooves 821, corresponding to the second connector 833 provided on the armrest tubes 830 on either side. Optionally, the first locking groove 821 is provided on the fixing base 820 near the first fastener 801. When the second connector 833 and the first locking groove 821 engage with each other (i.e., the second connector 833 is locked into the first locking groove 821), the second connector 833 and the first fastener 801 are spaced apart from each other.

[0235] More specifically, when the second connector 833 is in the locked position (see, for example, FIG. 30 ), that is, when the second connector 833 is locked (e.g., engaged) in the first locking slot 821, the armrest tube 830 is locked relative to the fixing base 820 and the column mechanism. When the second connector 833 is in the unlocked position (see, for example, FIG. 31 ), that is, when the second connector 833 is disengaged from the first locking slot 821, the armrest tube 830 can pivot relative to the fixing base 820 and the column mechanism, thereby folding the foldable crib.

[0236] 32 to 34 , which are partial enlarged views of the armrest mechanism shown in FIG. 29 in different states, wherein the front fixing seat 820 is removed to illustrate the internal structure of the armrest mechanism.

[0237] As shown in Figures 32 to 34, the handrail tube 830 is slidably pivoted to the fixed base 820. The handrail tube 830 is provided with an elongated hole 831 for connecting with the first fastener 801 fixedly disposed on the fixed base 820. Optionally, the elongated hole 831 is a hole extending along the length of the handrail tube 830. The first fastener 801 is slidably disposed in the elongated hole 831. That is, the first fastener 801 can be connected to the handrail tube 830 by passing through the elongated hole 831 and can slide within the elongated hole 831, so that the handrail tube 830 can both pivot relative to the fixed base 820 and slide relative to the fixed base 820, for example, sliding in the transverse direction of the fixed base 820. Optionally, the elongated hole 831 (and the first fastener 801 accommodated therein) and the second connecting member 833 are spaced apart from each other. For example, the second connecting member 833 is closer to the end of the handrail tube 830 connected to the column mechanism than the elongated hole 831. Alternatively or additionally, when the second connecting member 833 and the first locking groove 821 are engaged with each other, the second connecting member 833 and the long hole 831 (and the first fastening member 801 ) are at substantially the same level.

[0238] It should be noted that, in other embodiments, the long hole 831 may also be provided on the fixing seat 820 , and the present disclosure is not limited thereto, as long as the armrest tube 830 can simultaneously pivot and slide relative to the fixing seat 820 .

[0239] As shown in FIG32 , the foldable crib may further include a synchronization assembly 870. The synchronization assembly 870 includes two synchronization components, such as two synchronization gears, namely, a first synchronization gear 871 and a second synchronization gear 872. In this embodiment, the first synchronization gear 871 and the second synchronization gear 872 are engaged with each other (e.g., meshed) to enable synchronous rotation, and are each linked to a handrail tube 830, allowing the two handrail tubes 830 connected to either side of the fixing base 820 to be synchronously folded or unfolded.

[0240] Specifically, referring to Figures 32, 35, and 36, Figure 32 illustrates a front view of the synchronization assembly 870 mounted on the fixed base 820, Figure 35 illustrates a perspective view of the synchronization gears (e.g., the first synchronization gear 871 and / or the second synchronization gear 872) of Figure 32, and Figure 36 illustrates a cross-sectional view taken along line XX in Figure 32. The first synchronization gear 871 can be pivotally connected to the fixed base 820 via a first rotation axis 873 (e.g., centered around the first rotation axis 873), while the second synchronization gear 872 can be pivotally connected to the fixed base 820 via a second rotation axis 874 (e.g., centered around the second rotation axis 874). Specifically, the first rotation axis 873 can be provided on the first synchronization gear 871, and the second rotation axis 874 can be provided on the second synchronization gear 872, so as to engage with corresponding holes in the fixed base 820, thereby achieving a rotational connection between the first and second synchronization gears 871, 872, and the fixed base 820. In one example, as shown in Figures 35 and 36, the first rotating shaft 873 and / or the second rotating shaft 874 can be a columnar structure protruding from the outer surface of the first synchronous gear 871 and / or the second synchronous gear 872, or can be a connecting pin that passes through the first synchronous gear 871 and / or the second synchronous gear 872, but the present disclosure is not limited to this. In addition, the first synchronous gear 871 and the second synchronous gear 872 can have the same structure, or can have similar but different structures, such as having different rotating shafts. Optionally, the first synchronous gear 871 and the second synchronous gear 872 have meshing teeth on at least a portion of their circumferences, for example, meshing teeth are provided at least at the position where the two mesh with each other.

[0241] In the present disclosure, the foldable crib can be provided with four synchronization assemblies 870, and each synchronization assembly 870 corresponds to an armrest mechanism. In this embodiment, the four synchronization assemblies 870 can have the same structure, but the present disclosure is not limited to this. The synchronization assemblies 870 can each have a different structure, for example, the same structure as the synchronization assembly in any of the aforementioned embodiments.

[0242] As shown in Figures 35 and 36 , taking the first synchronous gear 871 as an example, a first linkage groove 871a is provided on the first synchronous gear 871, for example, near the outer diameter of the first synchronous gear 871. Specifically, with further reference to Figures 32 to 34 , the first synchronous gear 871 may have an extension 871b extending outward from its outer diameter. The first linkage groove 871a is located on the extension 871b and extends along the extension 871b in the diametrical direction of the first synchronous gear 871. Correspondingly, a plastic inner plug is provided at the end of the handrail tube 830. The plastic inner plug partially passes through the handrail tube 830 and is secured by a second connecting member 833. The portion of the plastic inner plug exposed from the handrail tube 830 is provided with a first connecting member 832. The first connecting member 832 is movably connected to the first linkage groove 871a, for example, slidably received in the first linkage groove 871a. Of course, the first connecting member 832 can also be provided in other ways. For example, the first connecting member 832 can be a connecting column fixedly provided on the outer surface of the handrail tube 830 , or a protrusion protruding from the outer surface of the handrail tube 830 .

[0243] 32 and 36 , the first connector 832 may be provided at the end of the handrail tube 830. Optionally, the first connector 832 is provided farther from the end of the handrail tube 830 connected to the column 810 than the first fastener 801 and the second connector 833.

[0244] Optionally, the first connecting member 832 may be integrally formed with the handrail tube 830. Optionally or alternatively, the first connecting member 832 may also be detachably connected to the handrail tube 830, such as a connecting pin passing through the handrail tube 830, but the present disclosure is not limited thereto.

[0245] In one specific example, the first linkage groove 871a can be a groove or depression extending along the diameter of the first synchronous gear 871. Alternatively, the first linkage groove 871a can be provided on the extension portion 871b. That is, the first linkage groove 871a does not penetrate the extension portion 871b. However, the present disclosure is not limited thereto. The first linkage groove 871a can also have the same structure as the first linkage groove 671a in the sixth embodiment, and the first linkage groove 871a can also penetrate the extension portion 871b.

[0246] Similarly, the second synchronous gear 872 is provided with a second linkage groove having the same structure as the first linkage groove 871a. The second linkage groove is also movably connected to the first connecting member. Optionally, the first linkage groove 871a and the second linkage groove can be arranged in mirror symmetry, for example, relative to the centerline C8 of the fixed base 820 in the transverse direction.

[0247] For example, with reference to Figures 32 to 35, when the armrest mechanism is in the expanded state, the first linkage groove 871a and the second linkage groove are respectively located at the upper ends of the first synchronization gear 871 and the second synchronization gear 872 (refer to the position of the extension portion 871b); and when the armrest mechanism gradually changes from the expanded state (see Figure 32) to the folded state (see Figures 33 and 34), the relative position of the first linkage groove 871a and the first connecting member 832 changes with the counterclockwise rotation of the first synchronization gear 871, and synchronously, the relative position of the second linkage groove and the first connecting member changes with the clockwise rotation of the second synchronization gear 872, so that the first linkage groove 871a and the second linkage groove are always mirror-symmetrical with respect to the position where the synchronization gears 871 and 872 are meshed with each other (for example, the center line C8).

[0248] The following will further describe the expanded and folded states of the foldable crib of the eighth embodiment of the present disclosure with reference to Figures 37 and 38. Specifically, Figure 37 is a schematic diagram of the armrest mechanism of this embodiment when expanded, and Figure 38 is a schematic diagram of the armrest mechanism shown in Figure 37 when folded.

[0249] As shown in FIG37 , when the second connector 833 is in the locked position, the second connector 833 engages with the first locking groove 821, locking the armrest tube 830 relative to the fixing base 820 and the column mechanism (including the column 810 and / or the top corner member 840), thereby placing the armrest mechanism (and the entire foldable crib) in the deployed state. Referring to FIG38 , and further in conjunction with FIG31 and FIG32 to FIG34 , when the foldable crib needs to be folded, the armrest tubes 830 on both sides are moved outward (e.g., pulled) to disengage the second connector 833 from the first locking groove 821, i.e., moving the second connector 833 to the unlocked position, allowing the armrest tube 830 to pivot relative to the fixing base 820 and the column mechanism until it pivots to the position shown in FIG38 (i.e., the foldable crib is in the folded state). At the same time, by providing a synchronization assembly 870, specifically a first synchronization gear 871 and a second synchronization gear 872 that engage with each other, when the armrest tube 830 on either side pivots relative to the fixed base 820, it can drive the armrest tube 830 on the other side to pivot synchronously, so that the two armrest tubes 830 on both sides of the fixed base 820 move synchronously, thereby achieving synchronous folding of the various armrest mechanisms of the foldable crib. Correspondingly, the synchronization assembly 870 can also achieve synchronous deployment of the various armrest mechanisms of the foldable crib.

[0250] A ninth embodiment of the present disclosure will be described below.

[0251] 39A and 39B , the foldable crib 400s includes a column mechanism, which includes columns 410s. Optionally, the foldable crib 400s may include four columns 410s, but the present application is not limited thereto. The columns 410s may be substantially perpendicular to the ground and used to support the foldable crib 400s. The four columns 410s may collectively form a quadrilateral structure (e.g., a rectangular structure), but the present application is not limited thereto. The column mechanism may also include multiple columns, such as six or eight, to form a hexagonal or octagonal crib structure.

[0252] The foldable crib 400s includes an armrest tube 430s, which is connected between the upper ends of each two columns 410s. The interior of the armrest tube 430s may be hollow. The armrest tube 430s may be substantially parallel to the ground, or may be substantially perpendicular to the columns 410s. The armrest tube 430s may include a first armrest tube 430as and a second armrest tube 430bs. As shown in Figure 39A, the first armrest tube 430as may be located on the right side of the fixed base 420s (described in detail below), and the second armrest tube 430bs may be located on the left side of the fixed base 420s. The foldable crib 400s may have a folded state and an expanded state (described in detail below).

[0253] In some embodiments, the foldable crib 400s may include a top corner piece 440s. The top corner piece 440s may be fixedly connected to the upper end of the column 410s (i.e., the end away from the ground). When viewed from above the foldable crib 400s, the top corner piece 440s may be formed into a right-angled shape, and the corners of the top corner piece 440s are arc-shaped. The crib 400s may have four top corner pieces 440s, which are respectively arranged at the upper ends of the four columns 410s, but the present application is not limited thereto. The armrest tube 430s may be pivotally connected to the top corner piece 440s. A handrail tube 430s may be pivotally connected to each of the two sides of the corner of each top corner piece 440s. In other words, a top corner piece 440s may be pivotally connected to each of the two ends of the handrail tube 430s.

[0254] The foldable crib 400s includes a fixing base 420s. Specifically, the foldable crib 400s may include four fixing bases 420s, but the present application is not limited thereto. Each fixing base 420s is pivotally connected on both sides between a first armrest tube 430as and a second armrest tube 430bs, such that a first armrest tube 430as, a second armrest tube 430bs, and a fixing base 420s are located between every two corner pieces 440s.

[0255] In some embodiments, the fixing base 420s can be locked and released with the ends of the first and second armrest tubes 430as, 430bs, thereby enabling the foldable crib 400s to transition between an expanded state and a collapsed state. Specifically, when the fixing base 420s is locked relative to the armrest tubes 430s, the foldable crib 400s can be maintained in the expanded state, and when the fixing base 420s is released relative to the armrest tubes 430s, the foldable crib 400s can transition from the expanded state to the collapsed state.

[0256] In some embodiments, the foldable crib 400s may further include a bottom frame 480s. The bottom frame 480s may include bottom bars 481s and a base 482s. Specifically, the bottom frame 480s may include four bottom bars 481s and one base 482s, but the present application is not limited thereto. One end of each bottom bar 481s is pivotally connected to the base 482s, and the other end of each bottom bar 481s is pivotally connected to the lower end of the column 410s. The position where the bottom bars 481s are connected to the column 410s is near the end of the column 410s that contacts the ground. When viewed from above the foldable crib 400s, the bottom frame 480s may be formed in a shape similar to the letter "X". The bottom frame 480s may have a locked state and a released state. The bottom bars 481s may be tubular (i.e., having a hollow structure) or may be solid rods, but the present disclosure is not limited thereto. In some embodiments, when the crib 400s is in the expanded state, the bottom frame 480s can be locked to assist in maintaining the expansion of the crib 400s; and when the bottom frame 480s is in the unlocked state, the bottom frame 480s can be operated to drive the fixing seat 420s and the armrest tube 430s to be unlocked relative to each other, thereby driving the entire foldable crib 400s to be folded and expanded.

[0257] In some embodiments, as shown in Figures 39B and 41 , the foldable crib 400s may further include a linkage mechanism 450s. The linkage mechanism 450s may include a linkage rod 451s, a first linkage member 452s, and a second linkage member 453s. Each first armrest tube 430As and second armrest tube 430Bs is provided with a corresponding linkage mechanism 450s. The linkage rod 451s is slidably disposed relative to the armrest tube 430s. For example, the linkage rod 451s may be disposed within the armrest tube 430s or may be disposed externally thereto. Each linkage rod 451s is pivotally connected to a first linkage member 452s at one end near the top corner fitting 440s, and each linkage rod 451s is pivotally connected to a second linkage member 453s at one end near the fixing base 420s. The first linkage member 452s is pivotally connected to the top corner fitting 440s at one end away from the linkage rod 451s. The location where the first link 452s connects to the top corner fitting 440s may be lower than the location where the handrail tube 430s connects to the top corner fitting 440s. In other words, the location where the first link 452s connects to the top corner fitting 440s is closer to the ground than the location where the handrail tube 430s connects to the top corner fitting 440s. The second link 453s is pivotally connected to the fixed base 420s at one end away from the link rod 451s. In some embodiments, the first link 452s and the second link 453s may be formed as straight pieces, but the present application is not limited to this. In other embodiments, the first link 452s and / or the second link 453s may be curved. The link rod 451s may be formed to match the interior space or exterior shape of the handrail tube 430s, thereby preventing shaking and noise when the link rod 451s slides relative to the handrail tube 430s.

[0258] In some embodiments, when the bottom frame 480s is unlocked, by pulling the bottom frame 480s upward along the F direction, the bottom end of the column 410s is driven to fold inward, so that the column 410s and the top corner piece 440s are pivoted relative to the linkage mechanism 450s with the connection point between the first linkage piece 452s and the top corner piece 440s as the pivot point, thereby driving the armrest tube 430s pivotally connected to the upper end of the top corner piece 440s to move outward relative to the fixing seat 420s, so that the armrest tube 430s and the fixing seat 420s are unlocked, and finally the foldable crib 400s can be converted from the expanded state to the folded state.

[0259] In some embodiments, referring to Figures 40 and 47, the fixing seat 420s may include a fixing seat shell 421s and a fixing member 422s connected to the fixing seat shell 421s. The fixing seat shell 421s may be formed by bending a single sheet, or may be formed by, for example, two sheets fixedly connected, but the present application is not limited thereto. The lower end (the end facing the ground) of the fixing seat shell 421s may have an opening 4211s. The fixing member 422s is configured to block the opening 4211s, and the fixing member 422s includes a vertical extension and a horizontal extension, the vertical extension being used to be inserted into the fixing seat shell 421s, and the horizontal extension being used to block the opening 4211s. In other words, the fixing member 422s is inserted into the fixing seat shell 421s from the opening 4211s. When viewed from the side of the fixing base housing 421s (i.e., from the side of the handrail tube 430s inserted into the fixing base housing 421s), the fixing base housing 421s may have a shape similar to the letter "U". Specifically, the fixing base housing 421s may include a first piece 4212s, a second piece 4213s, and a connecting piece 4214s. The first piece 4212s and the second piece 4213s may have the same shape, but the present application is not limited to this. The first piece 4212s and the second piece 4213s may both be formed into a trapezoidal shape, but the present application is not limited to this. Alternatively, the first piece 4212s and the second piece 4213s may both be formed into a rectangular shape. The connecting piece 4214s may connect the upper ends of the first piece 4212s and the second piece 4213s to each other. The first and second handrail tubes 430as and 430bs may be connected to each other on both sides of the upper portion of the fixing base housing 421s via first fasteners 401s. The two sides of the lower portion of the mounting base housing 421s can be pivotally connected to the two second linkage members 453s via second fasteners 402s. The second fasteners 402s can form a pivot axis for the second linkage members 453s to pivot relative to the mounting base housing 421s. The second fasteners 402s can be rivets, but the present application is not limited thereto.

[0260] The fixing member 422s may be made of plastic, but the present application is not limited thereto. The fixing member 422s may be partially inserted into the fixing base housing 421s through the opening 4211s, thereby sealing the lower end of the fixing base. This prevents the seat fabric from entering the fixing base 420s and obstructing the folding or unfolding of the foldable crib 400s, and also prevents a person's hand from entering the fixing base 420s and causing injury. The outer surface of the portion of the fixing member 422s located outside the fixing base housing 421s may be flush with the outer surface of the fixing base housing 421s, providing a good tactile feel. The fixing member 422s may include a first fixing member 423s and a second fixing member 424s. The first fixing member 423s and the second fixing member 424s may have the same shape. A gap may be provided between the first fixing member 423s and the second fixing member 424s, allowing the first synchronizing member 471s and the second synchronizing member 472s to be movably positioned between the first fixing member 423s and the second fixing member 424s. The first fixing member 423s and the second fixing member 424s can be fixed to the first plate 4212s and the second plate 4213s, respectively. The second fastener 402s can pass through the first fixing member 423s and the second fixing member 424s simultaneously, fixing the first fixing member 423s and the second fixing member 424s to each other and fixedly connected to the fixing base housing 421s. The first fixing member 423s and the second fixing member 424s are arranged to overlap with each other. The two second linkage members 453s can be inserted between the first fixing member 423s and the second fixing member 424s from both sides.

[0261] Referring to Figures 41, 42A, and 42B, the foldable crib 400s further includes a snap-fit ​​member 432s. Specifically, each first armrest tube 430as and second armrest tube 430bs is provided with a corresponding snap-fit ​​member 432s, but the present application is not limited thereto. The snap-fit ​​member 432s may be fixedly connected to the armrest tube 430s. Each snap-fit ​​member 432s is fixed to the interior of one end of an armrest tube 430s near the fixed base 420s. The snap-fit ​​member 432s and the armrest tube 430s are movably and pivotally connected to the fixed base 420s. Specifically, the snap-fit ​​member 432s may have an elongated hole or sliding groove 431s (the armrest tube 430s also has a corresponding elongated hole or sliding groove). The elongated hole 431s may extend along the length of the armrest tube 430s (i.e., when the foldable crib 400s is unfolded, the elongated hole 431s extends in a generally horizontal direction). The first fastener 401s is fixedly connected to the upper portion of the fixing base 420s and can be connected to the engaging member 432s by passing through the elongated hole 431s, thereby connecting to the handrail tube 430s. The first fastener 401s can move and rotate within the elongated hole 431s, thereby allowing the handrail tube 430s to move and pivot relative to the fixing base 420s (specifically, the fixing base housing 421s). The first fastener 401s can form a pivot axis for the handrail tube 430s to pivot relative to the fixing base housing 421s.

[0262] Referring to Figures 42A, 42B, 45, and 46, the foldable crib 400s further includes a synchronization assembly 470s, which is configured to allow the armrest tubes on both sides of the fixed base 420s (i.e., the first armrest tube 430as and the second armrest tube 430bs) to pivot and fold synchronously. Specifically, the foldable crib 400s may include four synchronization assemblies 470s, i.e., one synchronization assembly 470s for each armrest tube 430s, or one synchronization assembly 470s for each fixed base 420s. The synchronization assembly 470s may include a first synchronization member 471s, a second synchronization member 472s, a third synchronization member 473s, and a fourth synchronization member 474s. The first synchronization member 471s, the second synchronization member 472s, the third synchronization member 473s, and the fourth synchronization member 474s may be formed as a sheet, specifically, may be formed from an iron sheet, but the present application is not limited thereto. The first synchronizer 471s and the second synchronizer 472s may have symmetrical shapes and may be formed into a curved shape, the third synchronizer 473s and the fourth synchronizer 474s may have the same shape and may be formed into a straight shape, and the lengths of the first synchronizer 471s and the second synchronizer 472s may be greater than the third synchronizer 473s and the fourth synchronizer 474s, but the present application is not limited thereto. The first synchronizer 471s and the second synchronizer 472s may be bent along the length direction, such that the first synchronizer 471s and the second synchronizer 472s overlap each other at the first end and bend upward at the second end.

[0263] In some embodiments, the fixing member 422s may include a guide groove 425s. Of course, the guide groove 425s may also be provided on the fixing base 420s. The guide groove 425s is elongated and extends in a vertical direction (perpendicular to the ground). The first ends of the first synchronizer 471s and the second synchronizer 472s are movably connected to the fixing base 420s. Specifically, the first ends of the first synchronizer 471s and the second synchronizer 472s can be pivotally and slidably connected to the fixing base 420s; the second ends of the first synchronizer 471s and the second synchronizer 472s can be pivotally connected to the handrail tube 430s, more specifically, pivotally connected to the engaging member 432s. The first synchronizer 471s and the second synchronizer 472s are arranged in an interlaced manner. In some embodiments, the first ends of the first synchronizer 471s and the second synchronizer 472s are arranged in an interlaced manner. A third fastener 403s is provided at the intersection of the first synchronizer 471s and the second synchronizer 472s. The first and second synchronizers 471s and 472s can pivot relative to the third fastener 403s. The first ends of the first and second synchronizers 471s and 472s can be pivotally connected to each other via the third fastener 403. The third fastener 403s can be disposed within the guide groove 425s. When the first and / or second armrest tubes 430as and 430bs pivot relative to the fixed base 420s, the third fastener 403s slides within the guide groove 425s.

[0264] The first ends of the third synchronizer 473s and the fourth synchronizer 474s may be pivotally connected to each other. The second end of the third synchronizer 473s may be pivotally connected between the first and second ends of the first synchronizer 471s, and the second end of the fourth synchronizer 474s may be pivotally connected between the first and second ends of the second synchronizer 472s. The first ends of the third synchronizer 473s and the fourth synchronizer 474s may be pivotally connected to each other via a fourth fastener 404s and constrained within the guide slot 425s. Within the guide slot 425s, the first ends of the third synchronizer 473s and the fourth synchronizer 474s may be located above the first ends of the first synchronizer 471s and the second synchronizer 472s, but the present application is not limited thereto. The second end of the third synchronizer 473s may be pivotally connected to the first synchronizer 471s via a fifth fastener 405s. Specifically, the second end of the third synchronizer 473s is connected to a position between the first and second ends of the first synchronizer 471s, for example, near the third fastener 403s. The function of the synchronizer assembly 470s is to synchronize the movement of the first and second handrail tubes 430as and 430bs on both sides of the fixed base 420s. The provision of the third synchronizer 473s and the fourth synchronizer 474s can enhance synchronization of the synchronizer assembly 470s. The second end of the fourth synchronizer 474s is pivotally connected to the second synchronizer 472s via another fifth fastener 405s. Specifically, the second end of the fourth synchronizer 474s is connected to a position between the first and second ends of the second synchronizer 472s, for example, near the third fastener 403s. The second ends of the first and second synchronizers 471s and 472s are pivotally connected to the first and second handrail tubes 430as and 430bs, respectively. The second end (opposite the first end) of the first synchronizer 471s is movably connected to the first handrail tube 430as. Specifically, the second end of the first synchronizer 471s can be pivotally connected to the end of the first handrail tube 430as via the sixth fastener 406s. The second end of the second synchronizer 472s can be movably connected to the second handrail tube 430bs. Specifically, the second end of the second synchronizer 472 can be pivotally connected to the end of the second handrail tube 430bs via the sixth fastener 406s. The first fastener 401s and the sixth fastener 406s can be located at approximately the same level, with the sixth fastener 406s being closer to the interior of the fixing base 420s than the first fastener 401s.

[0265] The function of the synchronization assembly is illustrated by taking the pivoting of the first armrest tube 430as as an example. When the armrest tube 430s is released and the first armrest tube 430as pivots relative to the fixed seat 420s, the armrest tube 430as drives the first synchronization member 471s pivotally connected thereto to rotate and slide downward, thereby driving the third fastener 403s to slide downward, and at the same time driving the third synchronization member 473s to slide downward and rotate. The downward sliding of the third fastener 403s will drive the second synchronization member 472s to slide downward and rotate, and the downward sliding and rotation of the third synchronization member 473s will drive the fourth synchronization member 474s to slide downward and rotate as well. The downward sliding and rotation of the fourth synchronization member 474s will also drive the second synchronization member 472s to slide downward and rotate, further driving the second armrest tube 430bs to rotate relative to the fixed seat 420s, thereby realizing the synchronous retraction of the first armrest tube 430as and the second armrest tube 430bs.

[0266] In some embodiments, as shown in FIG42A , a snap-fit ​​member 432s is disposed within the handrail tube 430s. Optionally, the snap-fit ​​member 432s may partially extend from the end of the handrail tube 430s. The snap-fit ​​member 432s may have an abutment portion 433s on the side facing the first synchronizer 471s and the second synchronizer 472s. The abutment portion 433s may abut one end of the first synchronizer 471s and the second synchronizer 472s, thereby further stabilizing the rotation of the first synchronizer 471s and the second synchronizer 472s. The upper side of the fixing member 422s may have a spacer 426s. The spacer 426s protrudes vertically upward from the fixing member 422s.

[0267] In some embodiments, the fixing member 422s may have a bilaterally symmetrical shape. As shown in FIG42A , the upper surfaces of the fixing member 422s may each have a rotation guide surface 427s, a rotation stop surface 428s, and a locking portion 429s. The rotation stop surface 428s is generally vertical and located outside the rotation guide surface 427s. The locking portion 429s is generally horizontal and located inside the rotation guide surface 427s. The rotation stop surface 428s and the locking portion 429s may be flat, but the present application is not limited thereto. The rotation guide surface 427s may also be curved.

[0268] When the foldable crib 400s is in the expanded state, the spacer 426s is located between the armrest tubes 430s on both sides (the first armrest tube 430as and the second armrest tube 430bs). The lower side of the engaging member 432s is abutted by the engaging portion 429s of the fixing member 422s, preventing the armrest tubes 430s from pivoting around the first fastener 401s. Optionally, a flexible material is formed on the outer side of the spacer 426s to prevent it from being hit by the engaging member 432s and generating noise.

[0269] In some embodiments, the fixing member 422s includes a first fixing member 423s and a second fixing member 424s. Each of the first fixing member 423s and the second fixing member 424s may have a guide groove 425s, a spacer 426s, a rotation guide surface 427s, and a rotation stop surface 428s. Alternatively, only one of the first fixing member 423s and the second fixing member 424s may have a guide groove 425s, a spacer 426s, a rotation guide surface 427s, and a rotation stop surface 428s.

[0270] The following will describe the folding and unfolding process of the foldable crib 400s.

[0271] During the conversion of the foldable crib 400s from the expanded state to the folded state, the pivotal movement of one of the first armrest tube 430as and the second armrest tube 430bs relative to the fixed seat 420s drives the first synchronizer 471s and the second synchronizer 472s to move relative to the fixed seat 420s, thereby driving the other of the first armrest tube 430as and the second armrest tube 430bs to pivot relative to the fixed seat 420s, thereby achieving synchronous folding of the first armrest tube 430as and the second armrest tube 430bs.

[0272] Specifically, referring to Figures 39A and 39B , when folding the crib 400s, the base 482s is first released and then pulled upward (as indicated by arrow F in Figure 39A ). The base 482s drives the bottom rod 481s, causing the lower end of the column 410s to move inward and the top corner piece 440s at the upper end of the column 410s to pivot about the connecting axis between the first link 452s and the top corner piece 440s. This, in turn, pulls the armrest tube 430s outward (away from the fixed base 420s).

[0273] Referring to Figures 41, 42A, and 42B, when the handrail tubes 430s (first handrail tube 430as and second handrail tube 430bs) on either side of the fixed base 420s are pulled away from the fixed base 420s (this process can be seen from the transition from Figure 42B to Figure 42A), the two handrail tubes 430s move outward, causing the ends of the engaging members 432s to be positioned above the rotation guide surface 427s and no longer contacting the engaging portion 429s. Simultaneously, the first fastener 401s relatively moves from the outer end of the elongated hole 431s to the inner end of the elongated hole 431s, preventing the handrail tubes 430s from moving further away from the fixed base 420s. Furthermore, the second ends of the first and second synchronizers 471s and 472s (the ends connected to the sixth fastener 406s) move with the handrail tubes 430s.

[0274] Then, referring to Figures 43 and 44 , the fixed base 420s is pushed downward (or the fixed base 420s relies on its own weight), causing the handrail tube 430s to pivot relative to the first fastener 401s (the second handrail tube 430bs pivots clockwise, and the first handrail tube 430as pivots counterclockwise). Under the action of the synchronization assembly 470s, one end of the two engaging members 432s on the handrail tubes 430s on both sides of the fixed base 420s (the first handrail tube 430as and the second handrail tube 430bs) respectively moves synchronously along the two rotation guide surfaces 427s on both sides of the fixed member 422s. The end of the engaging member 432s that contacts the rotation guide surface 427s may have a profile that matches the rotation guide surface 427s. The second ends of the first and second synchronizers 471s and 472s (the ends connected to the sixth fastener 406s) move further outward along the armrest tube 430s. Furthermore, the first ends of the first and second synchronizers 471s and 472s (the ends located within the guide groove 425s), as well as the ends of the third and fourth synchronizers 473s and 474s located within the guide groove 425s, can move along the guide groove 425s. When the armrest tube 430s further pivots and abuts against the rotation stop surface 428s, the armrest tube 430s is stopped by the rotation stop surface 428s. This completes the folding process of the foldable crib 400s, at which point all upright posts 410s are maximally close to one another and remain substantially upright.

[0275] It can be understood that when the base 482s is unlocked and pulled upward, each fixing seat 420s and the handrail tubes 430s on both sides thereof (the first handrail tube 430as and the second handrail tube 430bs) can be folded at the same time.

[0276] When the foldable crib 400s is unfolded, the fixing base 420s is pushed upward, causing the first and second armrest tubes 430as and 430bs to pivot relative to the sixth fastener 406s (the second armrest tube 430bs pivots counterclockwise, and the first armrest tube 430as pivots clockwise). Under the action of the synchronization assembly 470s, one end of the two engaging members 432s on the first and second armrest tubes 430as and 430bs moves synchronously along the two rotation guide surfaces 427s on either side of the fixing member 422s. The second ends of the first and second synchronizing members 471s and 472s move inward along with the armrest tubes 430s. When the armrest tubes 430s further pivot to a substantially horizontal position, the engaging members 432s extending from one end of the armrest tube 430s leave the rotation guide surface 427s and are positioned above the engaging portion 429s.

[0277] Then, the base 482s can be pushed or pulled downward. The bottom rod 481s is driven by the base 482s, causing the lower end of the column 410s to move outward and causing the top corner piece 440s at the upper end of the column 410s to pivot about the connecting axis between the first link 452s and the top corner piece 440s, which in turn pushes the armrest tube 430s inward (in a direction toward the fixed seat 420s). Ultimately, when the end of the engaging member 432s extending out of the armrest tube 430s abuts the spacer 426s or the first fastener 401s moves to the outer end of the elongated hole 431s, the armrest tube 430s stops moving. At this point, the base 482s is in its lowest position and can be locked, thereby preventing the unfolded foldable crib 400s from being accidentally folded.

[0278] The following describes a tenth embodiment of the present disclosure. The same parts as those of the ninth embodiment will be omitted to avoid repeated description.

[0279] Referring to Figures 48 and 49 , the tenth embodiment differs from the ninth embodiment in that the synchronization assembly 470s of the foldable crib 400s in the tenth embodiment includes only the first and second synchronization members 471s, 472s, and does not include the third and fourth synchronization members 473s, 474s. Consequently, only the first ends of the first and second synchronization members 471s, 472s are positioned within the guide groove 425s. The function of the synchronization assembly will be explained using the pivoting of the first armrest tube 430as as an example. When the armrest tube 430s is released and pivots relative to the fixed base 420s, the armrest tube 430as drives the pivotally connected first synchronization member 471s to rotate and slide downward, thereby driving the third fastener 403s to slide downward. This in turn drives the second synchronization member 472s to slide downward and rotate, further driving the second armrest tube 430bs to rotate relative to the fixed base 420s, thereby achieving synchronized folding of the first and second armrest tubes 430as, 430bs.

[0280] The following describes an eleventh embodiment of the present disclosure. The same parts as those of the ninth embodiment will be omitted to avoid repeated description.

[0281] Referring to Figure 50, the first fixing member 423s may include a spacer 426s, a rotation guide surface 427s, a rotation stop surface 428s, and a locking portion 429s. The first fixing member 423s may have a symmetrical shape. The spacer 426s is located in the middle of the first fixing member 423s and extends vertically upward. Two rotation guide surfaces 427s, two rotation stop surfaces 428s, and two locking portions 429s are respectively provided on either side of the spacer 426s. The two locking portions 429s are adjacent to the spacer 426s and form an angle with the spacer 426s. The two rotation stop surfaces 428s are located at opposite ends of the first fixing member 423s and extend generally parallel to the spacer 426s, that is, they extend generally vertically upward. Each of the two rotation guide surfaces 427s may be located between a locking portion 429s and a rotation stop surface 428s. The engaging portion 429s may be formed as a substantially horizontal surface, the rotation stop surface 428s may be formed as a substantially vertical surface, and the rotation guide surface 427s may be formed as a curved surface, but the present application is not limited thereto. A positioning protrusion 4271s may be formed on each rotation guide surface 427s. The positioning protrusion 4271s may be integrally formed with the rotation guide surface 427s, or the positioning protrusion 4271s may be formed separately and connected to the rotation guide surface 427s. The positioning protrusion 4271s may protrude from the rotation guide surface 427s so that the rotation guide surface 427s does not form a smooth curved surface at the positioning protrusion 4271s. The first fixing member 423s may be made of plastic, but the present application is not limited thereto.

[0282] As in the previous embodiment, the fixing member 422s of this embodiment may include a first fixing member 423s and a second fixing member 424s. The first fixing member 423s and the second fixing member 424s may be formed to be substantially mirror-symmetrical with each other. In other words, the second fixing member 424s may also have the aforementioned spacer 426s, rotation guide surface 427s, rotation stop surface 428s, engaging portion 429s, and positioning protrusion 4271s.

[0283] The following description will only be made by taking the first fixing member 423s as an example. The specific structure of the second fixing member 424s can refer to the description of the first fixing member 423s and the description of the aforementioned embodiment.

[0284] 51 to 53 , the foldable crib 400s can have an expanded state (as shown in FIG. 51 and FIG. 52 ) and a collapsed state (as shown in FIG. 53 ). The armrest tubes 430s may include a first armrest tube 430as and a second armrest tube 430bs. When the foldable crib 400s is in the expanded state, the ends of the first and second armrest tubes 430as and 430bs and the portions of the two engaging members 432s extending from the first and second armrest tubes 430as and 430bs engage with the engaging portions 429s, thereby maintaining the crib 400s in the expanded state (see FIG. 52 and FIG. 54 ). When the crib 430s is in the collapsed state, the portions of the two engaging members 432s extending from the first and second armrest tubes 430as and 430bs are respectively retained by the two positioning protrusions 4271s, thereby maintaining the crib 400s in the collapsed state (see FIG. 53 and FIG. 55 ). Thus, the two positioning protrusions 4271s can respectively prevent the first armrest tube 430as and the second armrest tube 430bs from being unintentionally pivoted, thereby changing the crib 400s from the folded state to the expanded state. Due to the positioning protrusions 4271s, the crib 400s can be maintained in the folded position and can stand on its own in the folded position, making it easy to use.

[0285] 52 to 55 , when the crib 400s is moved from the expanded state to the collapsed state, the first and second armrest tubes 430as and 430bs move away from the partition 426s (the linkage between the first and second armrest tubes 430as and 430bs can be seen in the previous embodiment). This causes the ends of the two engaging members 432s on the first and second armrest tubes 430as and 430bs to disengage from the two engaging members 429s. Simultaneously, the two first fasteners 401s on the first and second armrest tubes 430as and 430bs move relative to each other from the outer ends of the two elongated holes 431s to the inner ends of the two elongated holes 431s, preventing the first and second armrest tubes 430as and 430bs from further outward movement.

[0286] Then, the fixing base 420s (see FIG. 39A ) moves downward, while the first and second armrest tubes 430as and 430bs pivot relative to their corresponding first fasteners 401s (as shown in FIG. 52 through FIG. 55 , the second armrest tube 430bs pivots clockwise, while the first armrest tube 430as pivots counterclockwise). One end of each of the two engaging members 432s on the first and second armrest tubes 430as and 430bs moves synchronously along the two rotation guide surfaces 427s on either side of the fixing member 422s. Optionally, the end of each engaging member 432s that contacts the corresponding rotation guide surface 427s may have a profile that matches that of the rotation guide surface 427s, but the present application is not limited thereto. When the two engaging members 432s move to the positions of the two positioning protrusions 4271s, the pivoting of the first and second armrest tubes 430as and 430bs is blocked by the two positioning protrusions 4271s. At this point, the force required to pivot the first and second armrest tubes 430as and 430bs must be increased to overcome the resistance exerted by the two positioning protrusions 4271s. The first and second armrest tubes 430as and 430bs then pivot further, passing over the two positioning protrusions 4271s. Finally, the first and second armrest tubes 430as and 430bs abut against the two rotation stop surfaces 428s, preventing further pivoting. This completes the folding process of the foldable crib 400s. At this point, all uprights 410s are maximally aligned and substantially vertical, with the first and second armrest tubes 430as and 430bs in a vertically aligned position. The two positioning protrusions 4271s are adjacent to the two engaging members 432s on the first and second armrest tubes 430as and 430bs, respectively, to prevent undesirable pivoting of the first and second armrest tubes 430as and 430bs.

[0287] As can be seen from the above description, when the foldable crib 400s is in the folded state, the positioning protrusions 4271s resist the pivoting of the first and second armrest tubes 430as, 430bs, thereby preventing the crib 400s from transitioning from the folded state to the expanded state. To transition the crib 400s from the folded state to the expanded state, a thrust is applied to the first and second armrest tubes 430as, 430bs to overcome the resistance of the two positioning protrusions 4271s. The first and second armrest tubes 430as, 430bs then pivot further and pass through the two positioning protrusions 4271s, respectively. Finally, the two engaging members 432s on the first and second armrest tubes 430as, 430bs engage with the two engaging portions 429s, respectively, preventing the first and second armrest tubes 430as, 430bs from further pivoting. In this way, the unfolding process of the foldable crib 400s is completed. At this time, all the columns 410s are far away from each other to the greatest extent and basically maintain a vertical state, and the first armrest tube 430as and the second armrest tube 430bs are in a horizontally unfolded state.

[0288] In other variant embodiments, the first fixing member 423s and the second fixing member 424s can be integrally formed with the fixing seat shell 421s, that is, the first fixing member 423s and the second fixing member 424s form a part of the fixing seat 420s, which can also achieve the effect of keeping the crib 400s in the folded state.

[0289] Although this embodiment only describes maintaining the crib 400s in the folded state by the positioning protrusion 4271s, in other embodiments, other structures may be provided to prevent the armrest tube 430s from changing from the folded state to the expanded state, thereby achieving a similar function to the positioning protrusion 4271s.

[0290] For other descriptions of how the crib 400s of this embodiment changes from an expanded state to a collapsed state, or vice versa, please refer to the previous embodiments and will not be repeated here. It should be noted that during the transition from the collapsed state to the expanded state, this embodiment differs from the previous embodiments in that the first and second armrest tubes 430as, 430bs first need to overcome the resistance exerted by the positioning projections 4271s on the pivoting of the first and second armrest tubes 430as, 430bs.

[0291] Although relative terms such as "upper" and "lower" are used in this specification to describe the relationship of one component to another component in the drawings, these terms are used in this specification for convenience only, such as based on the orientation of the examples depicted in the drawings. It is understood that if the illustrated device is flipped upside down, the component described as "upper" will become the component "lower." Other relative terms such as "top," "bottom," "left," and "right" have similar meanings. When a structure is "on" another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0292] In this specification, the terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising", "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and do not limit the quantity of their objects.

[0293] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. It should also be understood that terms should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined herein.

[0294] It should be understood that although preferred embodiments have been shown and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the appended claims. Therefore, it should be noted that various modifications and variations should not be considered as exceeding the technical spirit and scope of the present disclosure.

Claims

1. A foldable baby crib, comprising: Column mechanism; The fixing seat includes a first connecting groove; a handrail tube, one end of the handrail tube being pivotally connected to the column mechanism at a third pivot point, and the other end of the handrail tube being movably connected to the fixing seat at a fourth pivot point; as well as a linkage mechanism configured to assist in folding and unfolding the foldable crib, one end of the linkage mechanism being pivotally connected to the column mechanism, and the other end of the linkage mechanism being pivotally connected to the fixing seat, wherein the linkage mechanism comprises a linkage rod extending parallel to the armrest tube and a linkage member extending non-parallel to the linkage rod; In which, a connecting member is provided on the linkage mechanism or the armrest tube, and the connecting member can slide relative to the first connecting groove and has a locking position and a releasing position. When the connecting member is located at the locking position, the armrest tube is locked relative to the fixing seat and the column mechanism; and when the connecting member is located at the releasing position, the armrest tube can pivot relative to the fixing seat and the column mechanism to fold the foldable crib.

2. The foldable baby crib according to claim 1, wherein: The first connecting groove is configured as a first sliding groove in which the connecting member can slide, and the first sliding groove includes a first groove section parallel to the length direction of the handrail tube, and a second groove section arranged at an angle to the first groove section, the two opposite ends of the first groove section constitute a locking position and a release position of the connecting member, and the second groove section is connected to the first groove section at the end of the first groove section corresponding to the release position.

3. The foldable baby crib according to claim 1, wherein: The connecting rod is configured to be slidable relative to the handrail tube, and The linkage comprises: a first linking member, one end of the first linking member being pivotally connected to the column mechanism at a fifth pivot point, and the other end of the first linking member being pivotally connected to the first end of the linking rod at a first pivot point; and A second linking member, one end of the second linking member is pivotally connected to the fixing seat at a sixth pivot point, and the other end of the second linking member is pivotally connected to the second end of the linking rod at a second pivot point.

4. The foldable baby crib according to claim 3, wherein: The connecting rod is slidably arranged in the handrail tube. The handrail tube is provided with narrow slots at positions corresponding to the first end and the second end of the connecting rod, so that the first connecting piece and the second connecting piece can extend from the handrail tube.

5. The foldable baby crib according to claim 4, characterized in that: The angle between the connecting line of the third pivot point and the fifth pivot point and the connecting rod gradually decreases during the folding process of the foldable baby crib; and / or The angle between the connecting line of the fourth pivot point and the sixth pivot point and the connecting rod gradually decreases during the folding process of the foldable baby crib.

6. The foldable crib according to any one of claims 1 to 5, further comprising a synchronization assembly, wherein the synchronization assembly comprises two synchronization members arranged crosswise, wherein one end of each of the two synchronization members is pivotally connected to one of the armrest tubes, and the other end of each of the two synchronization members is pivotally and slidably connected to the fixing seat.

7. The foldable baby crib according to claim 6, wherein: The two synchronizers are respectively provided with a second sliding groove and a third sliding groove. The second fastener on the fixing seat is disposed in the second sliding slot and can slide and pivot relative to the second sliding slot, and The two third sliding grooves are cross-arranged, a third fastener is provided at the intersection of the two third sliding grooves, and the two synchronizers can pivot relative to the third fastener.

8. The foldable baby crib according to claim 1, wherein: The column mechanism includes a column and a top corner piece, the top corner piece is fixedly connected to the upper end of the column, and one end of the handrail tube and one end of the first linking piece are pivotally connected to the top corner piece respectively.

9. A foldable baby crib, comprising: Column mechanism; a handrail tube, one end of which is pivotally connected to the column mechanism; A fixing seat, to which the other end of the handrail tube is pivotally and slidably connected; as well as A linkage mechanism is used to assist the folding and unfolding of the foldable baby crib, the linkage mechanism comprising a linkage rod extending parallel to the armrest tube and a linkage member extending non-parallel to the linkage rod, the linkage mechanism being pivotally connected to the column mechanism and the fixing seat via corresponding linkage members, the linkage rod being pivotally connected to the corresponding linkage member via a first pivot point and a second pivot point. The foldable crib has an expanded state and a folded state. During the switching process of the foldable crib between the expanded state and the folded state, the positions of the first pivot point and the second pivot point relative to the armrest tube continuously change in a direction parallel to the armrest tube.

10. The foldable baby crib according to claim 9, wherein: The first pivot point and the second pivot point are located further away from the connection between the armrest tube and the column mechanism when the foldable crib is in the folded state than when the foldable crib is in the unfolded state.

11. The foldable baby crib according to claim 9, wherein: The handrail tube is pivotally connected to the column mechanism through a third pivot point, the handrail tube is pivotally connected to the fixing seat through a fourth pivot point, the corresponding linking member connected at the first pivot point is pivotally connected to the column mechanism through a fifth pivot point, and the corresponding linking member connected at the second pivot point is pivotally connected to the fixing seat through a sixth pivot point. The lines connecting the first pivot point, the third pivot point, and the fifth pivot point form a first triangle, the lines connecting the second pivot point, the fourth pivot point, and the sixth pivot point form a second triangle, and During the switching of the foldable baby playpen between the expanded state and the folded state, angles of respective corners of the first triangle and the second triangle continuously change.

12. The foldable baby crib according to claim 11, wherein: In the first triangle, the angle at the first pivot point is angle α1, the angle at the third pivot point is angle α3, and the angle at the fifth pivot point is angle α5, wherein, during the process of switching the foldable crib from the expanded state to the folded state, the angle α3 of the first triangle gradually decreases, the angle α5 gradually increases, and the angle α1 first increases and then decreases; and / or In the second triangle, the angle at the second pivot point is angle α2, the angle at the fourth pivot point is angle α4, and the angle at the sixth pivot point is angle α6, wherein, during the process of the foldable crib switching from the expanded state to the folded state, the angle α6 of the second triangle gradually decreases, the angle α4 gradually increases, and the angle α2 first increases and then decreases.

13. A foldable baby crib, comprising: Fixed seat; A first handrail tube and a second handrail tube pivotally connected to the fixing seat; as well as a synchronization assembly, the synchronization assembly comprising a first synchronization member and a second synchronization member, wherein a first end of the first synchronization member is movably connected to the fixing seat, a second end of the first synchronization member is movably connected to the first handrail tube, a first end of the second synchronization member is movably connected to the fixing seat, and a second end of the second synchronization member is movably connected to the second handrail tube; In which, the foldable baby crib has an expanded state and a folded state. During the process of the foldable baby crib being converted from the expanded state to the folded state, the pivotal movement of one of the first armrest tube and the second armrest tube relative to the fixed seat drives the first synchronizer and the second synchronizer to move relative to the fixed seat, thereby driving the other of the first armrest tube and the second armrest tube to pivot relative to the fixed seat, so as to achieve synchronous folding of the first armrest tube and the second armrest tube.

14. The foldable baby crib according to claim 13, wherein: The foldable baby crib further includes a column mechanism, the fixing seat is provided with a first sliding groove, and each of the first handrail tube and the second handrail tube is provided with a first connecting piece, or the fixing seat is provided with a first connecting piece, and each of the first handrail tube and the second handrail tube is provided with a first sliding groove, The first connecting member can slide in the first sliding groove and has a locking position and a releasing position. When the first connecting member is in the locking position, the armrest tube is locked relative to the fixing seat and the column mechanism; and when the first connecting member is in the releasing position, the armrest tube can pivot relative to the fixing seat and the column mechanism to fold the foldable crib.

15. The foldable crib according to claim 14 further includes a linkage mechanism, wherein the column mechanism is connected to the first armrest tube and the second armrest tube, one end of the linkage mechanism is pivotally connected to the column mechanism, and the other end of the linkage mechanism is pivotally connected to the fixed seat, and the linkage mechanism is configured so that the pivoting of the column mechanism relative to the first armrest tube and the second armrest tube drives the first armrest tube and the second armrest tube to move relative to the fixed seat, so that the first armrest tube and the second armrest tube are released relative to the fixed seat.

16. The foldable baby crib according to claim 15, wherein: The linkage mechanism includes a linkage rod extending parallel to the first handrail tube and the second handrail tube and a linkage member extending non-parallel to the linkage rod, wherein the linkage member includes: a first linking member, one end of the first linking member being pivotally connected to the column mechanism at a fifth pivot point, and the other end of the first linking member being pivotally connected to the first end of the linking rod at a first pivot point; and a second linking member, one end of the second linking member being pivotally connected to the fixing seat at a sixth pivot point, and the other end of the second linking member being pivotally connected to the second end of the linking rod at a second pivot point, Wherein, the connecting rod is configured to be able to slide relative to the first handrail tube and the second handrail tube along the extension direction of the first handrail tube and the second handrail tube.

17. The foldable baby crib according to claim 13, wherein: The first synchronizer and the second synchronizer are arranged alternately, and the first ends of the first synchronizer and the second synchronizer are respectively pivotally connected to the fixing seat in a sliding manner, and the second ends of the first synchronizer and the second synchronizer are respectively pivotally connected to the first handrail tube and the second handrail tube.

18. The foldable baby crib according to claim 17, wherein: A third fastener is provided at an intersection of the first synchronizer and the second synchronizer, and the first synchronizer and the second synchronizer are capable of pivoting relative to the third fastener.

19. The foldable baby crib according to claim 18, wherein: The fixing seat is provided with a guide groove, and the third fastener is arranged in the guide groove. When the handrail tube pivots relative to the fixing seat, the third fastener slides in the guide groove.

20. The foldable baby crib according to claim 13, wherein: The fixing seat comprises a fixing seat shell and a fixing piece connected to the fixing seat shell. The lower end of the fixing seat shell is provided with an opening, and the fixing piece is configured to cover the opening.

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