Baby crib capable of being unfolded and folded synchronously

Abstract

A baby crib capable of being unfolded and folded synchronously comprises two crib side frames, a bottom frame structure and two surrounding rod assemblies, the two surrounding rod assemblies are hinged between the tops of the two crib side frames, the bottom frame structure comprises an unlocking base plate and two bottom frames, the unlocking base plate is located between the two bottom frames, and the unlocking base plate is located between the two bottom frames. Each bottom frame corresponds to one bed side frame, one end of each bottom frame is rotatably connected with the corresponding bed side frame, the other end of each bottom frame is provided with two gears, every two adjacent gears on the two bottom frames are meshed with each other, the gears are rotatably connected with an unlocking base plate, and elastic plug pins are arranged in the front end and the rear end of the unlocking base plate. The gear is provided with a plug pin hole, a pulling piece is arranged in the middle of the unlocking chassis, the top of the pulling piece extends out of the top face of the unlocking chassis, and the middle of the two surrounding rod assemblies can be automatically folded downwards along with external expansion of the upper portions of the two bed side frames. The folding chair is easy to fold and unfold.

Description

Technical Field

[0001] The utility model relates to the field of children's products, in particular to a baby crib which can be synchronously unfolded and folded. Background Art

[0002] A crib is a bed for infants to sleep. Today's cribs come in a variety of styles, with widely varying functions and prices. With technological advancements, there are more and more types of cribs, including portable cribs, multifunctional cribs, smart cribs, and pillow-side cribs. Chinese Patent No. 202321145422.9 discloses a folding crib comprising side panels and a chassis structure. The chassis structure is disposed at the bottom of the folding crib and is rotatably connected to the side panels. The two side panels are provided, and two sets of bed rails are disposed between the upper portions of the two side panels.

[0003] In the aforementioned patent, when the crib is to be folded, a button must be pressed to unlock it, and then the chassis structure must be pulled upward. When the chassis structure is pulled upward to 45 degrees, the bed rails must be pressed downward to fully fold the crib. When the crib is to be unfolded, the side panels of the bed are first opened, and then the chassis structure is opened accordingly. When the chassis structure is opened to 45 degrees, the bed rails must be held, and then the bed rails must be pulled upward to straighten them. Finally, the chassis structure is unfolded to a horizontal position. Therefore, in the aforementioned patent document, both folding and unfolding the crib require multiple steps, making the operation more cumbersome. Utility Model Content

[0004] The utility model provides a baby crib that can be synchronously unfolded and folded, and its main purpose is to overcome the problem that the existing baby cribs are difficult to operate when unfolding and folding.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A baby bed that can be synchronously expanded and folded includes a bed side frame, a base frame structure and a surrounding rod assembly, wherein the bed side frames are provided with two, and the two bed side frames are arranged left and right, and the surrounding rod assembly is provided with two, and the two surrounding rod assemblies are arranged front and back and hinged between the tops of the two bed side frames, and the base frame structure includes an unlocking base and two base frames, and the unlocking base is located between the two base frames, and the two base frames are arranged left and right, and each base frame corresponds to a bed side frame, and one end of the base frame is rotatably connected to the bed side frame, and the other end of the base frame is provided with two gears, and the two gears are arranged front and back. The two adjacent gears on the two base frames are meshed with each other, and the gears are rotatably connected to the unlocking chassis. The front and rear ends of the unlocking chassis are respectively provided with elastic latches, and the gears are provided with latch holes. A pulling member is provided in the middle of the unlocking chassis, and the top of the pulling member extends out of the top surface of the unlocking chassis. When the pulling member is pulled upward, the latches in the front and rear ends of the unlocking chassis move toward each other, and after the two base frames are unfolded, the latches are inserted into the latch holes. The middle parts of the two surrounding rod assemblies can be automatically folded downward as the upper parts of the two bed side frames expand outward.

[0007] Furthermore, the unlocking chassis includes a chassis cover and two movable parts, the two movable parts are arranged front to back, and the two movable parts can move back and forth in the chassis cover. The pulling part is located between the two movable parts, and the pin is provided at one end of the movable part away from the pulling part. When the pulling part is pulled upward, the two movable parts move toward each other.

[0008] Furthermore, the bottom of the chassis cover is an open structure, and two limiting grooves are provided in the chassis cover, each limiting groove corresponds to a movable part, and the movable part is located in the corresponding limiting groove, and two connecting columns extending downward are provided in the limiting groove, and the two connecting columns are arranged front to back. The top surface of the movable part is an open structure, and the bottom of the movable part is provided with a first strip groove and a second strip groove arranged front to back, and the two connecting columns correspond to the first strip groove and the second strip groove respectively, and the bottom of the first strip groove and the second strip groove are both provided with screws, and the screws pass through the corresponding first strip groove and the second strip groove and are threadedly connected to the connecting column.

[0009] Furthermore, a spring mounting portion and a spring are provided in the movable part, the spring mounting portion is provided with a mounting groove with an opening at one end, one end of the spring is located in the mounting groove, and the other end of the spring is in conflict with a connecting column.

[0010] Furthermore, a hinge shaft is provided in the middle of the chassis cover, and the hinge shaft passes through the pulling member. The pulling member is arranged at an angle, and a movable opening is provided on the top surface of the chassis cover. The top of the pulling member extends out of the movable opening, and the pulling member is provided with two inclined guide grooves. The inclination angles of the two guide grooves are the same, and the two guide grooves are arranged up and down along the inclination direction of the pulling member. Each guide groove corresponds to a movable member, and the movable member is provided with two connecting ears arranged on the left and right at one end close to the pulling member. A first guide pin is provided between the two connecting ears, and the first guide pin passes through the guide groove.

[0011] Furthermore, a pull rope is provided on the top of the pulling member.

[0012] Furthermore, the gear is penetrated by a screw shaft, one end of the screw shaft penetrates into the chassis cover, one end of the bolt shaft is provided with a threaded section, and a nut connected to the threaded section is provided in the chassis cover.

[0013] Furthermore, the bottom of each of the two bed side frames is provided with two universal wheels arranged front and back, and the bottom of the bed side frame is also provided with a limit block inclined toward the unlocking chassis, and the limit block is located between the two universal wheels.

[0014] Furthermore, support rods are provided at the bottoms of both ends of the chassis cover, and a hinge piece is hinged at both ends of the chassis. The bottom of the hinge piece is hinged to a guide sleeve, and the support rods pass through the guide sleeve.

[0015] Furthermore, the enclosure rod assembly includes an articulated joint, two upper enclosure rods and two lower enclosure rods, the two upper enclosure rods are symmetrically arranged on the left and right, the left and right parts of the articulated joint are provided with openings, a rod sleeve is hinged in the opening, one end of the upper enclosure rod passes through the rod sleeve, two groups of first guide grooves are provided on the articulated joint, each group of first guide grooves corresponds to an upper enclosure rod, each group of first guide grooves consists of two first guide grooves arranged front and back, each first guide groove includes an inclined groove and a card groove connected to the top of the inclined groove, a first shaft rod is passed through each group of first guide grooves, the first shaft rod passes through the upper enclosure rod, the two lower enclosure rods are symmetrically arranged on the left and right, and one end of each lower enclosure rod is hinged in the opening.

[0016] Furthermore, a rod connector is provided at one end of each lower enclosure rod, and the rod connector is hinged in the opening. Two groups of strip holes are provided on the hinge joint, and each group of strip holes corresponds to a lower enclosure rod. Each group of strip holes is composed of two strip holes arranged front and back, and each group of strip holes is passed through a second shaft rod, and the second shaft rod passes through the rod connector and the lower enclosure rod.

[0017] The invention has the following advantages over the prior art: the invention has a novel structure and an ingenious design; when the baby crib is in the unfolded state, the latch is inserted into the latch hole and the baby crib cannot be folded; when the baby crib needs to be folded, the pulling member is pulled upward, so that the latches in the front and rear ends of the unlocking chassis move toward each other and separate from the latch holes. At this time, the pulling member continues to pull upward, and the unlocking chassis moves upward. During the upward movement of the unlocking chassis, the other ends of the two base frames begin to fold. Since the two adjacent gears on the two base frames engage with each other, the two base frames can be folded synchronously when folded. When the two base frames are folded, the lower parts of the two bed side frames move toward each other and the upper parts of the two bed side frames expand outward. At this time, the middle parts of the two guardrail assemblies automatically fold downward as the two bed side frames expand outward, and the unlocking chassis is continued to be pulled upward until the baby crib is completely folded. To unfold the crib, the upper portions of the two side frames are first extended outward, and then the unlocking chassis is pressed downward. As the unlocking chassis is pressed downward, the two base frames unfold synchronously. When the unlocking chassis is pressed downward until the latch is inserted into the latch hole, the crib is fully unfolded. This utility model is simple to operate during folding and unfolding, and the two base frames and the two side frames fold and unfold synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model when it is unfolded.

[0019] Figure 2 This is a structural diagram of the chassis structure of the present utility model.

[0020] Figure 3 This is a structural exploded view of the chassis structure of the present invention.

[0021] Figure 4 This is an exploded view of the unlocking chassis of the utility model.

[0022] Figure 5 This is a structural exploded view of the unlocking chassis of the utility model from another angle.

[0023] Figure 6 This is a partial structural diagram of the fence assembly of the present invention.

[0024] Figure 7 This is a partial structural exploded view of the fence assembly of the present invention.

[0025] Figure 8 This is a structural diagram of the utility model in a semi-folded state.

[0026] Figure 9 This is a structural diagram of the utility model in a folded state. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] Reference Figures 1 to 4 A baby bed that can be synchronously expanded and retracted includes a bed side frame 1, a base frame structure 2 and a surrounding rod assembly 3. There are two bed side frames 1, and the two bed side frames 1 are arranged left and right. There are two surrounding rod assemblies 3, and the two surrounding rod assemblies 3 are arranged front and back and hinged between the tops of the two bed side frames 1. The base frame structure 2 includes an unlocking chassis 4 and two base frames 5. The unlocking chassis 4 is located between the two base frames 5. The two base frames 5 are symmetrically arranged left and right. Each base frame 5 corresponds to a bed side frame 1. One end of the base frame 5 is rotatably connected to the bed side frame 1. The rotatable connection method of one end of the base frame 5 and the bed side frame 1 is an existing connection method and will not be repeated here. The other end of the base frame 5 is provided with two gears 6. The two gears 6 are arranged front and back. The two adjacent gears 6 on the two base frames 5 are meshed with each other. The gears 6 are rotatably connected to the unlocking chassis 4. The front and rear ends of the unlocking chassis 4 are both provided with elastic pins 40, the gear 6 is provided with a pin hole 61, and the middle part of the unlocking chassis 4 is provided with a pulling member 7, the top of the pulling member 7 extends out of the top surface of the unlocking chassis 4, and when the pulling member 7 is pulled upward, the pins 40 in the front and rear ends of the unlocking chassis 4 move toward each other, and after the two base frames 5 are unfolded, the pins 40 are inserted into the pin holes 61, and the middle parts of the two guardrail assemblies 3 can be automatically folded downward as the upper parts of the two bed side frames 1 expand outward.

[0029] Reference Figures 2 to 5 The unlocking chassis 4 includes a chassis cover 41 and two movable parts 42. The two movable parts 42 are arranged front to back. The two movable parts 42 can move back and forth in the chassis cover 41. The pulling member 7 is located between the two movable parts 42. The movable part 42 is away from the pulling member 7 at one end thereof. Two latches 40 are provided. Each latch 40 corresponds to a latch hole 61 on a gear 6. The latch 40 can extend out of the side of the chassis cover 41. When the pulling member 7 is pulled upward, the two movable parts 42 move toward each other.

[0030] Reference Figures 2 to 5The bottom of the chassis cover 41 is an open structure. Two limiting slots 43 are provided in the chassis cover 41. Each limiting slot 43 corresponds to a movable part 42. The movable part 42 is located in the corresponding limiting slot 43 and can move forward and backward in the limiting slot 43. Two connecting columns 431 extending downward are provided in the limiting slot 43. The two connecting columns 431 are arranged front to back. The top surface of the movable part 42 is an open structure. The bottom of the movable part 42 is provided with a first strip groove 44 and a second strip groove 45 arranged front to back. The two connecting columns 431 correspond to the first strip groove 44 and the second strip groove 45 respectively. The bottom of the first strip groove 44 and the second strip groove 45 are both provided with a screw 46. The screw 46 passes through the corresponding first strip groove 44 and the second strip groove 45 and is threadedly connected to the connecting column 431. The arrangement of the first strip groove 44 and the second strip groove 45 allows the movable part 42 to move in the front to back direction after the screw 46 is connected to the connecting column 431. A spring mounting portion 47 and a spring 48 are provided in the movable member 42 . The spring mounting portion 47 is provided with a mounting groove 49 with an opening at one end. One end of the spring 48 is located in the mounting groove 49 , and the other end of the spring 48 abuts against a connecting column 431 .

[0031] Reference Figures 2 to 5 A hinge shaft 411 is provided in the middle of the chassis cover 41, and the hinge shaft 411 passes through the pulling member 7, and the pulling member 7 is arranged at an angle. A movable opening 412 is provided on the top surface of the chassis cover 41, and the top of the pulling member 7 extends out of the movable opening 412. A pull rope 71 is provided on the top of the pulling member 7. The pulling member 7 is provided with two inclined guide grooves 72, and the inclination angles of the two guide grooves 72 are the same. The two guide grooves 72 are arranged up and down along the inclination direction of the pulling member 7, and each guide groove 72 corresponds to a movable member 42. The movable member 42 is provided with two connecting ears 421 arranged on the left and right at one end close to the pulling member 7, and a first guide pin 422 is provided between the two connecting ears 421, and the first guide pin 422 passes through the guide groove 72. In this embodiment, the connecting ears 421 on the two movable members 42 are staggered up and down.

[0032] Reference Figures 2 to 5 The pull rope 71 makes it convenient for the hand to pull the pulling member 7 upward. When the pulling member 7 is pulled upward, the two movable members 42 move toward each other under the cooperation of the guide groove 72 and the first guide pin 422, so that the latch 40 is separated from the latch hole 61; when the pulling member 7 is released, the two movable members 42 automatically reset under the action of the spring 48.

[0033] Reference Figures 2 to 5Gear 6 is threaded with a screw shaft 62, one end of which extends into the chassis cover 41. One end of the screw shaft 62 is provided with a threaded section 63, and a nut (not shown in the figure due to the viewing angle) is provided within the chassis cover 41 to connect to the threaded section 63. The screw shaft 62 and nut connect the gear 6 to the chassis cover 41. When the latch 40 is separated from the latch hole 61, the gear 6 can rotate relative to the chassis cover 41.

[0034] Reference Figure 1 The bottom of each of the two bed side frames 1 is provided with two universal wheels 11 arranged front and back. The universal wheels 11 have a brake function. The universal wheels 11 facilitate the overall movement of the crib and make folding of the bed side frames 1 smoother. The bottom of the bed side frames 1 is also provided with a limit block 12 inclined toward the unlocking chassis 4. The limit block 12 is located between the two universal wheels 11. The limit blocks 12 on the two bed side frames 1 are used to prevent the angle between the bottoms of the two bed side frames 1 from being too small when folding and unfolding, thereby preventing smooth folding and unfolding. When the limit blocks 12 on the two bed side frames 1 collide with each other, it proves that the angle between the bottoms of the bed side frames 1 is at the minimum angle.

[0035] Reference Figures 2 to 5 Support rods 413 are provided at the bottom of each end of the chassis cover 41. A hinged piece 51 is hingedly connected to each end of the chassis 5. The bottom of the hinged piece 51 is hingedly connected to a guide sleeve 52, through which the support rods 413 pass. The support rods 413 provide support for the unlocking chassis 4 when the crib is deployed. The guide sleeve 52 guides the unlocking chassis 4 during its vertical movement, ensuring that the unlocking chassis 4 moves vertically. A clearance space 423 is provided at the end of the movable member 42 that is away from the pulling member 7, allowing the support rods 413 to pass through.

[0036] Reference Figure 1 、 Figure 6 and Figure 7The enclosure rod assembly 3 includes a hinge joint 31, two upper enclosure rods 32, and two lower enclosure rods 33. The two upper enclosure rods 32 are symmetrically arranged. The left and right portions of the hinge joint 31 are each provided with an opening 34. Two rod sleeves 35 are hingedly connected within the openings 34. Each rod sleeve 35 corresponds to an upper enclosure rod 32, and one end of each upper enclosure rod 32 passes through the rod sleeve 35. The hinge joint 31 is provided with two sets of first guide grooves 36, each set of first guide grooves 36 corresponding to an upper enclosure rod 32. Each set of first guide grooves 36 consists of two first guide grooves 36 arranged in a front-to-rear manner. Each first guide groove 36 includes an inclined groove 37 and a latching groove 38 connected to the top of the inclined groove 37. A first shaft 39 is passed through each set of first guide grooves 36, and the first shaft 39 passes through the upper enclosure rod 32. The two lower enclosure rods 33 are symmetrically arranged, and one end of each lower enclosure rod 33 is hingedly connected to the opening 34.

[0037] Reference Figure 1 、 Figure 6 and Figure 7 Each lower enclosure bar 33 has a rod connector 30 at one end, hinged within an opening 34. The hinge joint 31 is provided with two groups of strip holes 311, each corresponding to a lower enclosure bar 33. Each group of strip holes 311 consists of two strip holes 311 arranged in a front-to-rear arrangement. Each group of strip holes 311 is penetrated by a second shaft 312, which passes through the rod connector 30 and the lower enclosure bar 33. When the upper and lower enclosure bars 32 and 33 are deployed, the first shaft 39 is located within the slot 38, and the second shaft 312 is located at the bottom of the shaft hole 311. The articulated connection between the enclosure bar assembly 3 and the bed side frame 1 is conventional and will not be further described here.

[0038] Reference Figure 1 、 Figure 6 and Figure 7 When the first shafts 39 of the two surrounding rod assemblies 3 are disengaged from the slots 38 , the two upper surrounding rods 32 and the two lower surrounding rods 33 in each surrounding rod assembly 3 can be folded relative to the hinge joint 31 .

[0039] Reference Figures 1 to 9The working principle of the present invention is as follows: when the crib is in the unfolded state, the latch 40 is inserted into the latch hole 61, and the crib cannot be folded at this time; when the crib needs to be folded, the pulling member 7 is pulled upward, the two movable members 42 move toward each other, the latches 40 on the two movable members 42 move toward each other and separate from the latch hole 61, and the pulling member 7 continues to be pulled upward, and the unlocking chassis 4 moves upward. During the upward movement of the unlocking chassis 4, the other ends of the two base frames 5 begin to fold. Since the two adjacent gears 6 on the two base frames 5 are meshed with each other, the two base frames 5 can fold synchronously when folding. When the two base frames 5 are folding, the lower portions of the two bed side frames 1 move toward each other, and the upper portions of the two bed side frames 1 expand outward. At this time, the first shafts 39 of the two surrounding rod assemblies 3 disengage from the slots 38, and the first shafts 39 enter the inclined slots 37. The middle portions of the two surrounding rod assemblies 3 automatically fold downward as the two bed side frames 1 expand outward. The unlocking chassis 4 is then pulled upward until the crib is fully folded. When the crib is to be unfolded, the upper portions of the two bed side frames 1 are first expanded outward, and then the unlocking chassis 4 is pressed downward. During the downward pressing process of the unlocking chassis 4, the two base frames 5 can be unfolded synchronously. When the unlocking chassis 4 is pressed down until the latch 40 is inserted into the latch hole 61, the crib is fully unfolded.

[0040] The above is only a specific implementation method of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A baby crib that can be expanded and retracted synchronously, characterized by: The invention comprises a bed side frame, a base frame structure and a surrounding rod assembly, wherein the bed side frames are provided with two, and the two bed side frames are arranged left and right, and the surrounding rod assembly is provided with two, and the two surrounding rod assemblies are arranged front and back and hinged between the tops of the two bed side frames, and the base frame structure comprises an unlocking base and two base frames, and the unlocking base frame is located between the two base frames, and the two base frames are arranged left and right, and each base frame corresponds to a bed side frame, and one end of the base frame is rotatably connected to the bed side frame, and the other end of the base frame is provided with two gears, and the two gears are arranged front and back. The two adjacent gears on the chassis are meshed with each other, and the gears are rotatably connected to the unlocking chassis. Elastic pins are provided in the front and rear ends of the unlocking chassis, and the gears are provided with pin holes. A pulling member is provided in the middle of the unlocking chassis, and the top of the pulling member extends out of the top surface of the unlocking chassis. When the pulling member is pulled upward, the pins in the front and rear ends of the unlocking chassis move toward each other. After the two chassis are unfolded, the pins are inserted into the pin holes, and the middle parts of the two guardrail assemblies can be automatically folded downward as the upper parts of the two bed side frames expand outward.

2. The synchronously deployable crib according to claim 1, characterized in that: The unlocking chassis includes a chassis cover and two movable parts, the two movable parts are arranged front to back, and the two movable parts can move back and forth in the chassis cover. The pulling part is located between the two movable parts, and the latch is provided at one end of the movable part away from the pulling part. When the pulling part is pulled upward, the two movable parts move toward each other.

3. The synchronously deployable crib according to claim 2, wherein: The bottom of the chassis cover is an open structure, and two limiting grooves are provided in the chassis cover, each limiting groove corresponds to a movable part, and the movable part is located in the corresponding limiting groove, and two connecting columns extending downward are provided in the limiting groove, and the two connecting columns are arranged front to back. The top surface of the movable part is an open structure, and the bottom of the movable part is provided with a first strip groove and a second strip groove arranged front to back, and the two connecting columns correspond to the first strip groove and the second strip groove respectively, and the bottom of the first strip groove and the second strip groove are both provided with screws, and the screws pass through the corresponding first strip groove and the second strip groove and are threadedly connected to the connecting column.

4. The synchronously deployable crib according to claim 3, wherein: A spring mounting portion and a spring are provided in the movable part. The spring mounting portion is provided with a mounting groove with an opening at one end. One end of the spring is located in the mounting groove, and the other end of the spring is in conflict with a connecting column.

5. The synchronously deployable crib according to claim 2, wherein: A hinge shaft is provided in the middle of the chassis cover, and the hinge shaft passes through the pulling member. The pulling member is arranged at an angle. A movable opening is provided on the top surface of the chassis cover, and the top of the pulling member extends out of the movable opening. The pulling member is provided with two inclined guide grooves, and the inclination angles of the two guide grooves are the same. The two guide grooves are arranged up and down along the inclination direction of the pulling member, and each guide groove corresponds to a movable member. Two connecting ears arranged on the left and right are provided at one end of the movable member close to the pulling member, and a first guide pin is provided between the two connecting ears, and the first guide pin passes through the guide groove.

6. The synchronously deployable crib according to claim 1, characterized in that: A pull rope is provided on the top of the pulling member.

7. The synchronously deployable crib according to claim 2, wherein: A screw shaft is passed through the gear, one end of the screw shaft passes through the chassis cover, one end of the bolt shaft is provided with a threaded section, and a nut connected with the threaded section is provided in the chassis cover.

8. The synchronously deployable crib according to claim 1, wherein: The bottom of each of the two bed side frames is provided with two universal wheels arranged front and back. The bottom of the bed side frame is also provided with a limit block inclined toward the unlocking chassis, and the limit block is located between the two universal wheels.

9. The synchronously deployable crib according to claim 2, wherein: The bottoms of both ends of the chassis cover are provided with support rods, and both ends of the chassis are hinged with a hinge piece, the bottom of the hinge piece is hinged with a guide sleeve, and the support rod passes through the guide sleeve.

10. The synchronously expandable and retractable baby crib according to claim 1, characterized in that: The enclosure rod assembly includes an articulated joint, two upper enclosure rods and two lower enclosure rods, the two upper enclosure rods are symmetrically arranged on the left and right sides, the left and right sides of the articulated joint are provided with openings, a rod sleeve is hinged in the opening, one end of the upper enclosure rod passes through the rod sleeve, two groups of first guide grooves are provided on the articulated joint, each group of first guide grooves corresponds to an upper enclosure rod, each group of first guide grooves consists of two first guide grooves arranged front and back, each first guide groove includes an inclined groove and a card groove connected to the top of the inclined groove, a first shaft rod is passed through each group of first guide grooves, the first shaft rod passes through the upper enclosure rod, the two lower enclosure rods are symmetrically arranged on the left and right sides, and one end of each lower enclosure rod is hinged in the opening.

11. The synchronously expandable and retractable baby crib according to claim 10, characterized in that: A rod connector is provided at one end of each lower enclosure rod, and the rod connector is hinged in the opening. Two groups of strip holes are provided on the hinge joint, and each group of strip holes corresponds to a lower enclosure rod. Each group of strip holes consists of two strip holes arranged front and back, and each group of strip holes is passed through a second shaft rod, which passes through the rod connector and the lower enclosure rod.

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