EP4460213A1

EP4460213A1 - Support leg and baby crib

Info

Publication number: EP4460213A1
Application number: EP23700452.8A
Authority: EP
Inventors: Junjie HU
Original assignee: Wonderland Switzerland AG
Current assignee: Wonderland Switzerland AG
Priority date: 2022-01-06
Filing date: 2023-01-05
Publication date: 2024-11-13
Also published as: DE112023000524T5; AU2023205315B2; TWI882280B; WO2023131653A1; JP2026034772A; JP2025502053A; TW202333607A; US20250107638A1; TW202529667A; KR20240129049A; CA3246666A1; CN116439522A; AU2023205315A1; JP7797661B2

Abstract

A support leg (300) and a baby crib are disclosed. The support leg (300) includes a main body portion (310), an extendable portion (320), an extension mechanism, and a buffer mechanism. The extendable portion (320) is slidably connected to the main body portion (310) and has an extended state and a retracted state relative to the main body portion (310). The extension mechanism is arranged between the main body portion (310) and the extendable portion (320) and configured to realize extension and retraction of the extendable portion (320). The buffer mechanism is configured to slow down an extension speed at which the extendable portion (320) is switched from the retracted state to the extended state. When the extendable portion is switched from the retracted state to the extended state, the buffer mechanism can slow down the extension speed of the extendable portion.

Description

SUPPORT LEG AND BABY CRIB

TECHNICAL FIELD

[0001] The present disclosure relates to the field of baby crib technologies, and in particular, to a support leg and a baby crib.

BACKGROUND

[0002] In order to make a baby crib abut against a big bed for adults or facilitate storage, support legs of the baby crib are generally configured to automatically eject under thrust of elastic elements. However, the support legs generally switch from a retracted state to an extended state at an excessively high speed, which easily produces impact noise or hits on a user's body, thereby having certain potential safety hazards and leading to poor user experience.

SUMMARY

[0003] Based on the above, there is a need to provide a support leg and a baby crib which have a function of slowing down an extension speed of the support leg, thereby preventing impact noise or hit on a user.

[0004] In a first aspect of the present disclosure, a support leg is provided. The support leg includes: a main body portion; an extendable portion slidably connected to the main body portion and having an extended state and a retracted state relative to the main body portion; an extension mechanism arranged between the main body portion and the extendable portion and configured to realize extension and retraction of the extendable portion; and a buffer mechanism configured to slow down an extension speed at which the extendable portion is switched from the retracted state to the extended state.

[0005] The extendable portion of the support leg realizes extension and retraction relative to the main body portion through the extension mechanism, and when the extendable portion is switched from the retracted state to the extended state, the buffer mechanism can slow down the extension speed of the extendable portion, thereby preventing impact noise, also preventing hit on a user's body, increasing a safety coefficient, and improving user experience.

[0006] In an embodiment, the main body portion includes a hollow sleeving housing, the extendable portion is partially located inside the sleeving housing and movable relative to the sleeving housing. The buffer mechanism includes a sliding plug fastened to an end of the extendable portion located inside the sleeving housing, the sliding plug is in airtight fit with the main body portion to form an air accommodation chamber with a variable volume, the sliding plug is provided with a vent, and the air accommodation chamber is communicated with outside atmosphere only through the vent.

[0007] In an embodiment, the main body portion includes a fixed member and a first guide member that are arranged inside the sleeving housing, the fixed member is fastened to the sleeving housing, and an end of the first guide member is connected to the fixed member and arranged along an extension direction of the extendable portion. The sliding plug has a first accommodating groove arranged along the extension direction of the extendable portion, the first guide member is partially accommodated in the first accommodating groove, the first guide member is in airtight fit with a wall of the first accommodating groove to form the air accommodation chamber, and the vent is arranged at a base of the first accommodating groove.

[0008] In an embodiment, an airtight flange is arranged around an end of the first guide member away from the fixed member, and the airtight flange is in airtight fit with the wall of the first accommodating groove to form the air accommodation chamber.

[0009] In an embodiment, the vent has an adjustable size.

[0010] In an embodiment, the main body portion further includes a fixed member arranged inside the sleeving housing, the fixed member is fastened to the sleeving housing, and the extension mechanism includes a reset member. Two ends of the reset member abut against the fixed member and the sliding plug respectively.

[0011] In an embodiment, the main body portion is further provided with a second guide member arranged along an extension direction of the extendable portion, an end of the second guide member is connected to the fixed member, and the reset member is arranged outside the second guide member.

[0012] In an embodiment, the sliding plug has a second accommodating groove arranged along the extension direction of the extendable portion, the second guide member is partially accommodated in the second accommodating groove, and two ends of the reset member abut against the fixed member and a base of the second accommodating groove respectively.

[0013] In an embodiment, the support leg further includes a locking mechanism configured to limit the extendable portion to the extended state.

[0014] In an embodiment, the locking mechanism includes a first mating member arranged on the sliding plug and a second mating member arranged on the fixed member, the first mating member and the second mating member are in sliding fit, one of the first mating member and the second mating member is provided with a resistance portion, and the other of the first mating member and the second mating member is adapted to overcome resistance of the resistance portion to implement switching of the extendable portion from the extended state to the retracted state.

[0015] In an embodiment, the first mating member is a slider having a guide slot, the second mating member is a guide post in sliding fit with the guide slot, and the resistance portion is arranged on the slider.

[0016] In an embodiment, the guide post is adapted to squeeze the resistance portion to elastically deform so that the extendable portion is switched to the retracted state, when the extendable portion is in the extended state and a force is applied to the extendable portion.

[0017] In an embodiment, the slider has a sliding main body and an elastic sheet, the sliding main body and the elastic sheet enclose and form the guide slot, an end of the elastic sheet is connected to the sliding main body, another end of the elastic sheet is spaced apart from the sliding main body to form a gap, and an end of the elastic sheet close to the gap is provided with the resistance portion.

[0018] In an embodiment, the resistance portion is a blocking bulge arranged on the elastic sheet and extending towards the guide slot.

[0019] In an embodiment, two sides of the main body portion are each provided with the extendable portion, and the extension mechanism and the buffer mechanism are arranged between the main body portion and each of the extendable portions located on the two sides of the main body portion respectively.

[0020] In an embodiment, the sliding plug of each of the buffer mechanisms located on the two sides of the main body portion respectively is in airtight fit with the main body portion to form the air accommodation chamber with the variable volume, each of the sliding plugs located on the two sides of the main body portion respectively is provided with the vent, and the air accommodation chamber is communicated with the outside atmosphere only through the vent.

[0021] In a second aspect of the present disclosure, a baby crib is provided. The baby crib includes a bed body, at least one column, and at least one support leg described above. Two ends of the column are connected to the bottom of the bed body and the top of the support leg respectively.

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a schematic structural diagram illustrating a baby crib according to an embodiment of the present disclosure;

[0023] FIG. 2 is a side partial sectional view of FIG. 1, with an extendable portion being in a full retracted state relative to a main body portion.

[0024] FIG. 3 is an enlarged view of portion A in FIG. 2.

[0025] FIG. 4 is another side partial sectional view of FIG. 1, with the extendable portion being in a partial retracted state relative to the main body portion.

[0026] FIG. 5 is an enlarged view of portion B in FIG. 4.

[0027] FIG. 6 is yet another side partial sectional view of FIG. 1, with the extendable portion being in a full extended state relative to the main body portion.

[0028] FIG. 7 is an enlarged view of portion C in FIG. 6.

[0029] FIG. 8 is a perspective view of a sliding plug in FIG. 2.

[0030] Reference signs:

100: bed body,

110: accommodating space, 200: column,

300: support leg,

310: main body portion,

311 : sleeving housing,

312: fixed member,

313: first guide member,

313a: airtight flange,

314: second guide member,

320: extendable portion,

321 : roller,

322: installation opening,

330: locking mechanism,

331 : slider,

331a: sliding main body,

331b: elastic sheet,

331c: guide slot,

33 Id: gap,

33 le: blocking bulge,

332: guide post,

340: sliding plug,

341 : first accommodating portion,

341a: first accommodating groove,

341b: vent,

342: second accommodating portion, 342a: second accommodating groove, 343: connecting portion,

344: abutting boss,

350: air accommodation chamber, and 360: reset member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to make the objectives, technical solutions, and advantages of the present disclosure clearer, the present disclosure is described in further detail below with reference to the drawings and specific implementations. It should be understood that the specific implementations described here are intended only to interpret the present disclosure, and not to limit the protection scope of the present disclosure.

[0032] It should be noted that when one element is referred to as "fastened to" another element, it may be directly disposed on the another element or an intermediate element may exist. When one element is considered to be "connected to" another element, it may be directly connected to the another element or an intermediate element may co-exist. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only, and do not represent unique implementations.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. The terms used in the specification of the present disclosure are intended only to describe specific implementations and are not intended to limit the present disclosure. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

[0034] As shown in FIG. 1 , an embodiment of the present disclosure provides a baby crib. The baby crib includes a bed body 100, at least one column 200, and at least one support leg 300. The baby crib has a function of slowing down an extension speed of the support leg 300, thereby preventing impact noise or hit on a user.

[0035] Specifically, as shown in FIG. 1 , the bed body 100 has an accommodating space 110 for accommodating a baby. The column 200 has an end connected to the bottom of the bed body 100 and another end connected to the top of the support leg 300. In this way, the column 200 and the support leg 300 form a support structure for the bed body 100. In this embodiment, two columns 200 are provided and respectively arranged on two sides in a length direction of the baby crib. Two support legs 300 are also correspondingly provided. Certainly, in other embodiments, numbers and positions of the column 200 and the support leg 300 may also be adjusted as required. [0036] Specifically, as shown in FIG. 2 to FIG. 7, the support leg 300 includes a main body portion 310, an extendable portion 320, a buffer mechanism, an extension mechanism, and a locking mechanism 330.

[0037] Specifically, as shown in FIG. 3, FIG. 5, and FIG. 7, the main body portion 310 includes a sleeving housing 311, a fixed member 312, a first guide member 313, and a second guide member 314. The sleeving housing 311 is of a hollow structure. The fixed member 312, the first guide member 313, and the second guide member 314 are all arranged inside the sleeving housing 311. In this embodiment, the fixed member 312 is fixed in the sleeving housing 311 at a substantially middle portion of the sleeving housing

311. In this embodiment, the first guide member 313, the second guide member 314, and the fixed member 312 are formed integrally. Certainly, in other embodiments, the first guide member 313, the second guide member 314, and the fixed member 312 may also be independent components.

[0038] Specifically, as shown in FIG. 3, the first guide member 313 is substantially rod- shaped, and an end of the first guide member 313 is fastened to the fixed member 312. The first guide member 313 is arranged along an extension direction of the extendable portion 320 (that is, a horizontal direction in this embodiment). An airtight flange 313a is arranged around an end of the first guide member 313 away from the fixed member 312. In this embodiment, two first guide members 313 are provided and symmetrically fastened to left and right sides of the fixed member 312. Certainly, in other embodiments, the number and position of the first guide member 313 may also be adjusted as required.

[0039] Specifically, as shown in FIG. 3, the second guide member 314 is substantially rod-shaped, and an end of the second guide member 314 is fastened to the fixed member

312. The second guide member 314 is arranged along the extension direction of the extendable portion 320. In this embodiment, two second guide members 314 are provided and symmetrically fastened to left and right sides of the fixed member 312, and the two second guide members 314 are located below the two first guide members 313 respectively. Certainly, in other embodiments, the number and position of the second guide member 314 may also be adjusted as required, and relative position between the second guide member 314 and the first guide member 313 may also be adjusted as required. For example, the first guide member 313 may be located below the second guide member 314.

[0040] Specifically, as shown in FIG. 2 and FIG. 3, the extendable portion 320 is of a substantially hollow tubular structure, and the extendable portion 320 is partially located inside the sleeving housing 311 and movable relative to the sleeving housing 311. In this embodiment, two extendable portions 320 are provided. The two extendable portions 320 are partially located inside the sleeving housing 311 respectively and movable relative to the sleeving housing 311 respectively. An end of each of the extendable portions 320 away from the sleeving housing 311 is provided with a roller 321 to facilitate movement of the baby crib.

[0041] Specifically, as shown in FIG. 2, FIG. 3, and FIG. 8, the buffer mechanism includes a sliding plug 340. The sliding plug 340 is fastened to an end of the extendable portion 320 located inside the sleeving housing 311. The sliding plug 340 includes a first accommodating portion 341, a second accommodating portion 342, and a connecting portion 343 connected between the first accommodating portion 341 and the second accommodating portion 342. The first accommodating portion 341 is provided with a first accommodating groove 341a arranged along the extension direction of the extendable portion 320, and the second accommodating portion 342 is provided with a second accommodating groove 342a arranged along the extension direction of the extendable portion 320. During the retraction of the extendable portion 320, as shown in FIG. 7, FIG. 5 and FIG. 3, the first guide member 313 is gradually inserted into the first accommodating groove 341a, and the second guide member 314 is gradually inserted into the second accommodating groove 342a. With the arrangement, the movement of the extendable portion 320 can be guided to some extent. The airtight flange 313a is in airtight fit with a wall of the first accommodating groove 341a to form an air accommodation chamber 350 with a variable volume. A base of the first accommodating groove 341a is provided with a vent 341b communicated with the air accommodation chamber 350.

[0042] As shown in FIG. 3 and FIG. 8, an abutting boss 344 is arranged around a periphery at an end of the sliding plug 340 close to notches of the first accommodating groove 341a and the second accommodating groove 342a. The end of the extendable portion 320 located inside the sleeving housing 311 is provided with an installation opening 322, and the sliding plug 340 is partially inserted into the extendable portion 320 via the installation opening 322. The abutting boss 344 is located outside the extendable portion 320, and a side of the abutting boss 344 away from the fixed member 312 abuts against a wall of the installation opening 322.

[0043] Further, the vent 314b has an adjustable size. For example, a movable blocking plate (not shown) may cover the vent 341b, and the size of the vent 314b is adjusted by adjusting a range of blocking of the vent 314b by the blocking plate. Certainly, the size of the vent 314b may also be adjusted in other manners.

[0044] In this embodiment, as shown in FIG. 2 and FIG. 3, the sliding plugs 340 are fastened to the extendable portions 320 on two sides of the main body portion 310. In this way, the sliding plugs 340 located on the two sides of the main body portion 310 are in airtight fit with the airtight flanges 313a on the corresponding first guide members 313 to form the air accommodation chambers 350 with the variable volume, the sliding plugs 340 located on the two sides are provided with the vents 341b, and the air accommodation chambers 350 are communicated with outside atmosphere only through the vents 341b.

[0045] In this way, when the extendable portion 320 is switched from a retracted state to an extended state relative to the main body portion 310 (as shown in FIG. 3, FIG. 5 and FIG. 7), the sliding plug(s) 340 located on one side (or two sides) of the main body portion 310 moves/move with the extendable portion 320 towards a direction away from the fixed member 312, so that the volume of the air accommodation chamber 350 becomes larger. Air pressure in the air accommodation chamber 350 is less than external atmospheric pressure, that is, negative pressure is generated in the air accommodation chamber 350, which forms resistance to the extension of the extendable portion(s) 320 located on the one side (or the two sides) of the main body portion 310. Therefore, the extension speed of the extendable portion(s) 320 located on the one side (or the two sides) of the main body portion 310 is slowed down. In this process, external air may gradually enter the air accommodation chambers 350 via the vents 341b in the sliding plugs 340 on the two sides of the main body portion 310, so as to gradually reduce the negative pressure in the air accommodation chambers 350. Therefore, the extendable portion(s) 320 located on the one side (or the two sides) of the main body portion 310 may gradually realize full extension at a relatively uniform speed under a dynamic balanced air pressure environment of the air accommodation chamber(s) 350, as shown in FIG. 6 and FIG. 7. In this way, impact noise or hit on the user due to an excessively high extension speed of the extendable portion(s) 320 can be prevented. At the same time, an air inlet speed of an air inlet can be adjusted by adjusting the size of the vent 341b, so that the extension speed of the extendable portion(s) 320 can be adjusted according to the user's requirement.

[0046] Certainly, the configuration of the buffer mechanism is not limited thereto, which may also be in other forms.

[0047] Specifically, as shown in FIG. 2 and FIG. 3, the extension mechanism includes a reset member 360. Optionally, the reset member 360 is a spring. Certainly, in other embodiments, the reset member 360 may also be other elastic member, such as a rubber column. In this embodiment, the spring is arranged around the second guide member 314, and the spring has an end abutting against the fixed member 312 and another end abutting against a base of the second accommodating groove 342a. In this way, for example, when the baby crib is required to be spliced with a big bed to be used as a bedside bed, the extendable portion 320 abuts against the big bed to retract towards the main body portion 310 to cause the reset member 360 to elastically deform, as shown in FIG. 2 and FIG. 3. However, when the baby crib is required to be spliced with the big bed and is moved away from the big bed, the extendable portion 320 automatically extends under the action of the reset member 360, as shown in FIG. 6 and FIG. 7. In this embodiment, two reset members 360 are provided and respectively arranged around the second guide members 314 located on two sides of the fixed member 312, so as to realize automatic ejection of the extendable portions 320 on the two sides of the main body portion 310.

[0048] Certainly, in other embodiments, the first guide member 313 and the second guide member 314 may be in a same configuration, and the first accommodating portion 341 and the second accommodating portion 342 may be in a same configuration. That is, a side of the fixed member 312 is provided with only one guide member, and the sliding plug 340 is required to be provided with only one accommodating portion. In this way, the configuration of the support leg 300 may be simplified, thereby reducing manufacturing difficulty. [0049] Specifically, as shown in FIG. 3, FIG. 5, and FIG. 7, the locking mechanism 330 includes a first mating member and a second mating member. In this embodiment, the first mating member is a slider 331. The slider 331 is of a substantially long strip structure and is arranged along the extension direction of the extendable portion 320. An end of the slider 331 is connected to the sliding plug 340. In this embodiment, the slider 331 and the sliding plug 340 are formed integrally. Certainly, in other embodiments, the slider 331 and the sliding plug 340 may also be two independent components. The slider 331 includes a sliding main body 331a and an elastic sheet 331b. The sliding main body 331a and the elastic sheet 331b enclose and form a guide slot 331c, an end of the elastic sheet 331b is connected to the sliding main body 331a, another end of the elastic sheet 331b is spaced apart from the sliding main body 331a to form a gap 33 Id, and an end of the elastic sheet 331b close to the gap 33 Id is provided with a resistance portion. In this embodiment, the resistance portion is a blocking bulge 33 le arranged on the elastic sheet 331b and extending towards the guide slot 331c. Certainly, in other embodiments, the resistance portion may also be in other configurations. The second mating member is a guide post 332 in sliding fit with the guide slot 331c, and the guide post 332 is arranged on the fixed member 312.

[0050] When the extendable portion 320 extends outwards, the slider 331 moves relative to the fixed member 312 to cause the guide post 332 slides relative to the guide slot 331c until the guide post 332 abuts against the blocking bulge 33 le. In this case, the guide post 332 presses against the blocking bulge 33 le under elastic force of the reset member 360 to cause the blocking bulge 331 e to deform, and then the guide post 332 enters a left end of the guide slot 331c and is blocked at the left end of the guide slot 331c by the blocking bulge 33 le with recovered deformation, so that the extendable portion 320 is locked in the extended state, as shown in FIG. 6 and FIG. 7. When the extendable portion 320 is required to switch from the extended state to the retracted state, certain external force is required to be applied to the extendable portion 320 to enable the guide post 332 to overcome resistance of the blocking bulge 33 le and unlock the extendable portion 320, so that the extendable portion 320 can be retracted to a suitable extent to abut against the big bed, as shown in FIG. 2 to FIG. 5. Certainly, in other embodiments, the locking mechanism 330 may also be in other forms.

[0051] Based on the above, specific operating principles of the support leg 300 and the baby crib are described as follows.

[0052] When the baby crib is required to be spliced with the big bed or the extendable portion 320 is required to retract relative to the main body portion 310 in other cases, certain external force is required to be applied to the extendable portion(s) 320 located on one side (or two sides) of the main body portion 310 to enable the guide post 332 to overcome the resistance of the blocking bulge 33 le and unlock the extendable portion(s) 320. The extendable portion(s) 320 located on the one side (or the two sides) of the main body portion 310 retracts/retract into the main body portion 310 under abutment of other objects to cause the reset member 360 to elastically deform, as shown in FIG. 2 and FIG. 3.

[0053] When the baby crib is not required to be spliced with the big bed and is moved away from the big bed or the extendable portion 320 is required to extend relative to the main body portion 310 in other cases, the extendable portion(s) 320 located on the one side (or the two sides) of the main body portion 310 releases/release the abutment against the big bed, and the extendable portion(s) 320 moves/move towards a direction away from the fixed member 312 under the elastic force of the reset member 360 and also drives/drive the corresponding sliding plug(s) 340 to move in a same direction, so that the volume(s) of the air accommodation chamber(s) 350 becomes/become larger. The air pressure in the air accommodation chamber(s) 350 is less than the external atmospheric pressure, that is, negative pressure is generated in the air accommodation chamber(s) 350, which forms resistance to the extension of the extendable portion(s) 320 located on the one side (or the two sides) of the main body portion 310. Therefore, the extension speed of the extendable portion(s) 320 located on the one side (or the two sides) of the main body portion 310 is slowed down. In this process, the external air may gradually enter the air accommodation chambers 350 via the vents 341b in the sliding plugs 340 on the two sides of the main body portion 310, so as to gradually reduce the negative pressure in the air accommodation chambers 350. Therefore, the extendable portion(s) 320 located on the one side (or the two sides) of the main body portion 310 may gradually realize full extension at a relatively uniform speed under a dynamic balanced air pressure environment of the air accommodation chamber(s) 350. In this way, impact noise or hit on the user due to an excessively high extension speed of the extendable portion(s) 320 can be prevented. The guide post 332 presses against the blocking bulge 33 le under the elastic force of the reset member 360 to cause the blocking bulge 331 e to deform, and then the guide post 332 enters the left end of the guide slot 331c and is blocked at the left end of the guide slot 331c by the blocking bulge 33 le with recovered deformation, so that the extendable portion(s) 320 is/are locked in the extended state, as shown in FIG. 6 and FIG. 7.

[0054] The support leg 300 and the baby crib have at least the following technical effects.

[0055] The extendable portion 320 of the support leg 300 realizes extension and retraction relative to the main body portion 310 through the extension mechanism, and when the extendable portion 320 is switched from the retracted state to the extended state, the buffer mechanism can slow down the extension speed of the extendable portion 320, thereby preventing impact noise, also preventing hit on a user's body, increasing a safety coefficient, and improving user experience.

[0056] The technical features in the above embodiments may be randomly combined. For concise description, not all possible combinations of the technical features in the above embodiments are described. However, all the combinations of the technical features are to be considered as falling within the scope described in this specification provided that they do not conflict with each other.

[0057] The above embodiments only describe several implementations of the present disclosure, and their description is specific and detailed, but cannot therefore be understood as a limitation on the patent scope of the invention. It should be noted that those of ordinary skill in the art may further make variations and improvements without departing from the conception of the present disclosure, and these all fall within the protection scope of the present disclosure. Therefore, the patent protection scope of the present disclosure should be subject to the appended claims.

Claims

CLAIMS What is claimed is:

1. A support leg, comprising: a main body portion; an extendable portion slidably connected to the main body portion and having an extended state and a retracted state relative to the main body portion; an extension mechanism arranged between the main body portion and the extendable portion and configured to realize extension and retraction of the extendable portion; and a buffer mechanism configured to slow down an extension speed at which the extendable portion is switched from the retracted state to the extended state.

2. The support leg according to claim 1 , wherein the main body portion includes a hollow sleeving housing, and the extendable portion is partially located inside the sleeving housing and movable relative to the sleeving housing, and wherein the buffer mechanism includes a sliding plug fastened to an end of the extendable portion located inside the sleeving housing, the sliding plug is in airtight fit with the main body portion to form an air accommodation chamber with a variable volume, the sliding plug is provided with a vent, and the air accommodation chamber is communicated with outside atmosphere only through the vent.

3. The support leg according to claim 2, wherein the main body portion includes a fixed member and a first guide member that are arranged inside the sleeving housing, the fixed member is fastened to the sleeving housing, and an end of the first guide member is connected to the fixed member and the first guide member is arranged along an extension direction of the extendable portion, and wherein the sliding plug has a first accommodating groove arranged along the extension direction of the extendable portion, the first guide member is partially accommodated in the first accommodating groove, the first guide member is in airtight fit with a wall of the first accommodating groove to form the air accommodation chamber, and the vent is arranged at a base of the first accommodating groove.

4. The support leg according to claim 3, wherein an airtight flange is arranged around an end of the first guide member away from the fixed member, and the airtight flange is in airtight fit with the wall of the first accommodating groove to form the air accommodation chamber.

5. The support leg according to any of the claims 2 to 4, wherein the vent has an adjustable size.

6. The support leg according to any of the claims 2 to 5, wherein the main body portion further includes a fixed member arranged inside the sleeving housing, the fixed member is fastened to the sleeving housing, and the extension mechanism includes a reset member, two ends of the reset member abutting against the fixed member and the sliding plug, respectively.

7. The support leg according to claim 6, wherein the main body portion is further provided with a second guide member arranged along an extension direction of the extendable portion, an end of the second guide member is connected to the fixed member, and the reset member is arranged around the second guide member.

8. The support leg according to claim 7, wherein the sliding plug has a second accommodating groove arranged along the extension direction of the extendable portion, the second guide member is partially accommodated in the second accommodating groove, and two ends of the reset member abut against the fixed member and a base of the second accommodating groove, respectively.

9. The support leg according to any of the preceding claims, further comprising a locking mechanism configured to limit the extendable portion to the extended state.

10. The support leg according to claim 9 in combination with any of the claims 2 to 8, wherein the locking mechanism includes a first mating member arranged on the sliding plug and a second mating member arranged on the fixed member, wherein the first mating member and the second mating member are in sliding fit, one of the first mating member and the second mating member is provided with a resistance portion, and the other of the first mating member and the second mating member is adapted to overcome resistance of the resistance portion to implement switching of the extendable portion from the extended state to the retracted state.

11. The support leg according to claim 10, wherein the first mating member is a slider having a guide slot, the second mating member is a guide post in sliding fit with the guide slot, and the resistance portion is arranged on the slider.

12. The support leg according to claim 11, wherein the guide post is adapted to press against the resistance portion to cause the resistance portion to elastically deform so that the extendable portion is switched to the retracted state, when the extendable portion is in the extended state and a force is applied to the extendable portion.

13. The support leg according to claim 11 or 12, wherein the slider has a sliding main body and an elastic sheet, wherein the sliding main body and the elastic sheet enclose and form the guide slot, an end of the elastic sheet is connected to the sliding main body, another end of the elastic sheet is spaced apart from the sliding main body to form a gap, and an

16 end of the elastic sheet close to the gap is provided with the resistance portion.

14. The support leg according to claim 13, wherein the resistance portion is a blocking bulge arranged on the elastic sheet and extending towards the guide slot.

15. The support leg according to any one of the preceding claims, wherein two sides of the main body portion are each provided with the extendable portion, and the extension mechanism and the buffer mechanism are arranged between the main body portion and each of the extendable portions located on the two sides of the main body portion, respectively.

16. The support leg according to claim 15 in combination with claim 2, optionally further in combination with any of the claims 3 to 14, wherein the sliding plug of each of the buffer mechanisms located on the two sides of the main body portion, respectively, is in airtight fit with the main body portion to form the air accommodation chamber with the variable volume, wherein each of the sliding plugs located on the two sides of the main body portion, respectively is provided with the vent, and the air accommodation chamber is communicated with the outside atmosphere only through the vent.

17. A baby crib, comprising a bed body, at least one column, and at least one support leg according to any one of claims 1 to 16, two ends of the column being connected to the bottom of the bed body and the top of the support leg, respectively.

17