Cradle locking mechanism, cradle unlocking mechanism, and foldable infant cradle device

Abstract

The present invention discloses a foldable infant cradle device, comprising a central pipe, two frames and two connecting modules. The connecting modules are respectively arranged on corresponding frames of the two frames, and the central pipe is arranged between the two connecting modules. The connecting module comprises a cradle locking mechanism, and when the cradle locking mechanism is in an unlocked state, the central pipe can move upward, and the foldable infant cradle device switches from a non-folded position to a folded position. The supporting pipes of each frame of the foldable infant cradle device can be folded and unfolded with each other through the connecting module and the connecting rod mechanism. The cradle locking mechanism and the cradle unlocking mechanism of the present invention have the advantages of simple structure and convenient operation, so the foldable infant cradle device composed of them can be simply folded and unfolded, and the volume can be reduced for easy storage.

Description

[0001] The application date of the original application is "2018 / 6 / 12", the application number is "201810603752.5" and the invention name is "Cradle locking mechanism, cradle unlocking mechanism, and foldable infant cradle device" Technical Field

[0002] The present invention relates to a cradle locking mechanism, a cradle unlocking mechanism and related folding infant cradle equipment, and in particular to a cradle locking mechanism and a cradle unlocking mechanism that can be easily folded and unfolded, and related folding infant cradle equipment that can utilize the cradle unlocking mechanism to trigger the function of the cradle locking mechanism. Background Art

[0003] Traditional children's play beds provide a closed environment where children can play and rest safely. Infant cradles can be placed on the upper armrests of children's play beds or installed inside children's play beds for newborns or young children to rest and sleep. However, traditional children's play beds are large in size. Although they have folding and storage functions, the folding process is cumbersome and inconvenient. Therefore, how to design a related device that can support a baby cradle and also has a simple folding and unfolding mechanism is one of the key development goals of the infant industry. Summary of the invention

[0004] The object of the present invention is to provide a cradle locking mechanism and a cradle unlocking mechanism that can be easily folded and unfolded, and a foldable infant cradle device related thereto that can utilize the cradle unlocking mechanism to trigger the function of the cradle locking mechanism, so as to solve the problems existing in the above-mentioned prior art.

[0005] The cradle locking mechanism of the present invention comprises a first hub, a second hub and a locking shaft. The second hub is rotatably connected to the first hub. The locking shaft is slidably disposed between the first hub and the second hub. The locking shaft can be completely retracted into the first hub to allow relative rotation between the first hub and the second hub. The locking shaft can also partially protrude from the first hub to limit the relative rotation. The first hub comprises a first tooth unit, the second hub comprises a second tooth unit, and the locking shaft comprises a third tooth unit, which is engaged between the first tooth unit and the second tooth unit to limit the relative rotation. When the locking shaft is completely retracted into the first hub, the third tooth unit separates the second tooth unit, allowing the relative rotation between the first hub and the second hub to fold and unfold the foldable infant cradle device. When the locking shaft partially protrudes from the first hub, the third tooth unit engages the first tooth unit and the second tooth unit to limit the relative rotation to fix the mode of the foldable infant cradle device. When the second hinge member rotates and switches between the folded position and the unfolded position, the second hinge member rotates relative to the first hinge member, and the third tooth unit does not engage with the second tooth unit. When the second hinge member rotates to the folded position or the unfolded position, the third tooth unit engages with the first tooth unit and the second tooth unit at the same time.

[0006] The cradle locking mechanism of the present invention further includes an elastic member, which is arranged between the first hub and the locking shaft. The elastic restoring force of the elastic member is used to drive the locking shaft to move toward the second hub. The elastic member is a helical compression spring. One end of the helical compression spring stops against the inner surface of the first hub, and the other end of the helical compression spring is arranged on the protrusion of the locking shaft. The first hub is mounted on a pipe. A pull rope is arranged in the pipe. One end of the pull rope is connected to the locking shaft, and the locking shaft is received into the first hub by the release member driven by the pull rope. The locking shaft includes a main body, a protrusion and a retaining rib. The protrusion and the retaining rib are respectively arranged on the first surface and the second surface of the main body, and the first surface and the second surface are opposite to each other. The locking shaft includes a third tooth unit, which is arranged at the edge of the main body. The third tooth unit is used to engage the first tooth unit and the second tooth unit. A channel is formed between the main body and the protrusion. One end of the pull rope passes through the channel and extends to the second surface to abut the retaining rib. The second hub member includes a hub body and an outer cover. The outer cover is fixed to the hub body to cover the first hub member, and the second tooth unit is located in the outer cover. Alternatively, the second hub member includes a hub body and an outer cover. The outer cover is detachably connected to the hub body, and the second tooth unit is located in the hub body.

[0007] The cradle unlocking mechanism of the present invention is applied to a pipe connected to a locking shaft. The cradle unlocking mechanism includes a pull rope and a release member. The pull rope is arranged in the pipe. One end of the pull rope is connected to the locking shaft. The release member is connected to the other end of the pull rope. When the release member is triggered, the pull rope is driven to guide the movement of the locking shaft relative to the pipe. The cradle unlocking mechanism also includes a handle and a pressure member. The handle is arranged on the pipe. The pressure member is movably arranged on the handle to drive the operation of the release member. The release member is a rotating plate member rotatably arranged on the handle. The pressure member has a pressure surface for stopping the protrusion of the release member. The pressure member slides linearly relative to the handle to rotate the release member through the contact between the pressure surface and the protrusion.

[0008] The release member of the present invention includes a handle and a cushion portion connected to each other. The cushion portion is slidably disposed on the tube. An opening is formed on the cushion portion, and a rib portion is disposed next to the opening. The pull cord is locked to the opening and stops against the rib portion. The handle is subjected to force in a direction opposite to the direction where the locking shaft is located so as to pull the pull cord through the cushion portion. The cradle release mechanism also includes a protective member disposed on the tube, and the handle is hidden under a shield of the protective member.

[0009] The supporting pipes of each frame of the foldable infant cradle device can be folded and unfolded with each other through a connecting module and a connecting rod mechanism. The connecting module uses a cradle locking mechanism to adjust the relative movement between the first pipe and the second pipe. The locking shaft of the cradle locking mechanism can be slidably arranged between the first hub and the outer cover, and the first hub is fixed to the first pipe, and the outer cover is fixed to the second hub arranged on the second pipe. When the locking shaft assembled on the first hub engages with the outer cover, the rotation between the first hub and the second hub is restricted; when the locking shaft separates from the outer cover, the rotation is no longer restricted and the first hub and the second hub can be freely rotated. The foldable infant cradle device uses a cradle release mechanism arranged on the central pipe to trigger the cradle locking mechanism. When the release member is triggered, the locking shaft is pulled by the pull rope to be retracted into the first hub; in addition, if the external force applied to the release member is removed, the locking shaft can be moved out of the first hub through the action part of the elastic member. The user can directly push the release member or indirectly apply force to the release member through the pressure member to separate the locking shaft member and the outer cover member. The cradle locking mechanism and the cradle unlocking mechanism of the present invention have the advantages of simple structure and convenient operation. Therefore, the foldable infant cradle device composed of the cradle can be easily folded and unfolded, and the volume can be reduced for easy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 and Figure 2 They are schematic diagrams of the foldable infant cradle device according to the embodiment of the present invention in different operation modes.

[0011] Figure 3 and Figure 4 Exploded views of components of the cradle locking mechanism according to an embodiment of the present invention at different viewing angles.

[0012] Figure 5 It is an assembly diagram of a cradle locking mechanism according to an embodiment of the present invention.

[0013] Figure 6 and Figure 7 sectional views of the cradle locking mechanism in different operation modes according to an embodiment of the present invention.

[0014] Figure 8 and Fig. 9FIG. 4 is a partial structural diagram of a cradle unlocking mechanism according to an embodiment of the present invention.

[0015] Fig.10 and Fig.11 Schematic diagrams of some components of the cradle release mechanism according to an embodiment of the present invention at different viewing angles.

[0016] Fig.12 and Fig.13 They are schematic diagrams of a pull rope and a release member in different operation stages according to an embodiment of the present invention.

[0017] Fig.14 Schematic diagram of a locking shaft according to an embodiment of the present invention.

[0018] Figures 15 to 17 They are schematic diagrams of a pull rope and a locking shaft in different operation stages according to an embodiment of the present invention.

[0019] Fig.18 and Fig.19 They are schematic diagrams of cradle unlocking mechanisms at different operation stages according to other embodiments of the present invention.

[0020] The reference numerals are described as follows:

[0021] 10 Foldable baby cradle equipment

[0022] 12 Central pipe fittings

[0023] 14 Frame

[0024] 16 connection modules

[0025] 18 Upper armrest

[0026] 20 connecting rod mechanism

[0027] 22 Support pipe fittings

[0028] 24 First pipe fitting

[0029] 26 Second pipe fitting

[0030] 28 cradle locking mechanism

[0031] 30First hub

[0032] 301 Inner surface of the first hinge member

[0033] 32 Second hub

[0034] 33 Hub Body

[0035] 34 outer cover

[0036] 36 locking shaft

[0037] 361 Locking the inner surface of the shaft

[0038] 362 protrusion

[0039] 363 Main body

[0040] 364 Keep Rib

[0041] 365 Locking the outer surface of the shaft

[0042] 366 channels

[0043] 38 elastic parts

[0044] 40 piercings

[0045] 42 first tooth unit

[0046] 44 Second tooth unit

[0047] 46Third tooth unit

[0048] 48, 48' cradle release mechanism

[0049] 50 pull rope

[0050] 501 District 1

[0051] 502 District 2

[0052] 503 District 3

[0053] 504 District 4

[0054] 52 release piece

[0055] 54 protective parts

[0056] 541 shutter

[0057] 56 handles

[0058] 58 Pad

[0059] 60 openings

[0060] 62 Ribs

[0061] 64 release parts

[0062] 66 handles

[0063] 68 pressure piece

[0064] 70 protrusion

[0065] 72 pressure surface DETAILED DESCRIPTION

[0066] See also Figure 1 and Figure 2 . Figure 1 and Figure 2They are schematic diagrams of the foldable infant cradle device 10 in different operating modes according to an embodiment of the present invention. The foldable infant cradle device 10 may include a central pipe 12, a frame 14, a connecting module 16, an upper armrest 18 and a connecting rod mechanism 20. The number of the aforementioned components is not limited to that described in this embodiment, and depends on the design requirements. The central pipe 12 is connected between two connecting modules 16. Each frame 14 may include two supporting pipes 22 for supporting the upper armrest 18. Each connecting module 16 is connected between the two supporting pipes 22 of the corresponding frame 14. The two supporting pipes 22 can be folded and unfolded with each other through the connecting module 16. The upper armrest 18 is arranged on the frame 14 through the connecting rod mechanism 20, and the soft material pad is detachably arranged on the upper armrest 18.

[0067] The soft material pad can be a sleeping pad accessory, installed on the upper armrest 18 and suspended above the central pipe 12 for a newborn baby to lie on. The soft material pad can also be a bedding accessory, installed on the upper armrest 18 and arranged on the central pipe 12, so that infants under five months old can lie down and rest. In addition, the soft material pad can also be a general mattress, installed in the upper armrest 18, and children over one year old can play or rest on the mattress. Once the soft material pad is removed, the foldable infant cradle device 10 can be easily folded and unfolded by operating the connecting module 16 and the connecting rod mechanism 20.

[0068] The connection module 16 may include a first pipe 24, a second pipe 26, and a cradle locking mechanism 28. The first pipe 24 and the second pipe 26 are rotatably connected to the support pipe 22. The cradle locking mechanism 28 is connected between the central pipe 12, the first pipe 24, and the second pipe 26. Figure 1 and Figure 2 As shown, the first tube 24 can rotate relative to the central tube 12 in a clockwise direction, and the second tube 26 can rotate relative to the central tube 12 in a counterclockwise direction, so that the first tube 24 and the second tube 26 can be folded with each other to reduce the volume of the foldable infant cradle device 10.

[0069] See also Figures 3 to 7 . Figure 3 and Figure 4 Exploded views of the cradle locking mechanism 28 at different viewing angles according to an embodiment of the present invention. Figure 5 1 is an assembly diagram of a cradle locking mechanism 28 according to an embodiment of the present invention. Figure 6 and Figure 7sectional views of the cradle locking mechanism 28 of an embodiment of the present invention in different operation modes. The cradle locking mechanism 28 may include a first hub member 30, a second hub member 32, a locking shaft member 36 and an elastic member 38. The second hub member 32 may include a hub body 33 and an outer cover member 34. The outer cover member 34 is detachably connected to the hub body 33. The first hub member 30 may be fixed to the first tube member 24. The second hub member 32 may be fixed to the second tube member 26 and rotatably connected to the first hub member 30. The outer cover member 34 is fixed to the second hub member 32 to cover the first hub member 30. The locking shaft member 36 may be disposed on the central tube member 12 and slidably disposed between the first hub member 30 and the outer cover member 34. The elastic member 38 may be disposed between the first hub member 30 and the locking shaft member 36.

[0070] The first hub member 30 may have a through hole 40, through which the central tube 12 is engaged. Therefore, one end of the central tube 12 may pass through the through hole 40 to connect the locking shaft member 36. The first hub member 30 may include a first tooth unit 42, and the second hub member 32 may include a second tooth unit 44 disposed on the hub body 33. The locking shaft member 36 may include a third tooth unit 46. When the locking shaft member 36 slides into the space formed by the first hub member 30 and the second hub member 32, the third tooth unit 46 can be movably engaged between the first tooth unit 42 and the second tooth unit 44.

[0071] In other possible embodiments, the second hub member 32 may include a hub body 33 and an outer cover member 34 that are fixedly connected together. The second tooth unit 44 may be disposed inside the outer cover member 34. When the second hub member 32 is coupled to the first hub member 30, the third tooth unit 46 may slide between the first tooth unit 42 and the second tooth unit 44 to constrain or release the relative rotation between the first hub member 30 and the second hub member 32.

[0072] like Figure 6 As shown, the locking shaft 36 partially protrudes from the first hinge 30 to engage the third tooth unit 46 with the first tooth unit 42 and the second tooth unit 44 at the same time, so that the relative rotation between the first hinge 30 and the second hinge 32 is restricted. Figure 1 Unfolded position shown or Figure 2 The folded position shown can be locked. Figure 7As shown, the locking shaft 36 is completely retracted into the first hub 30 to separate the third tooth unit 46 and the second tooth unit 44, so that the first hub 30 and the second hub 32 can rotate relative to each other. The second hub 32 can rotate freely relative to the first hub 30 and switch between the folded position and the unfolded position at will. When the locking shaft 36 is completely retracted into the first hub 30, the elastic member 38 is compressed to store the elastic restoring force. After the force that retracts the locking shaft 36 into the first hub 30 is removed, the elastic restoring force is released to push the locking shaft 36 to partially protrude from the first hub 30, that is, the elastic member 38 can push the locking shaft 36 toward the second hub 32 so that the third tooth unit 46 engages with the first tooth unit 42 and the second tooth unit 44.

[0073] In this embodiment, the elastic member 38 may be a helical compression spring, but the actual application is not limited thereto. One end of the elastic member 38 may abut against the inner surface 301 of the first hinge member 30, and the other end of the elastic member 38 may abut against the inner surface 361 of the locking shaft member 36. The elastic member 38 may be sleeved on the protrusion 362 of the locking shaft member 36, and the protrusion 362 is inserted into the central tube member 12 to connect the locking shaft member 36 and the central tube member 12. Furthermore, the elastic member 38 may be disposed in the space formed between the first hinge member 30 and the outer cover member 34, but between the side walls of the first hinge member 30 and the outer cover member 34 and the protrusion 362. Therefore, the elastic member 38 may not be sleeved on the protrusion 362.

[0074] In order to trigger the cradle locking mechanism 28, the central tube 12 of the foldable infant cradle device 10 may include a cradle release mechanism 48, which is used to pull the locking shaft 36 so that the third tooth unit 46 separates from the second tooth unit 44. The locking shaft 36 can be driven by a variety of cradle release mechanisms and retracted into the first hinge member 30. In a possible embodiment, the central tube 12 may have a twisting function and directly serve as the cradle release mechanism 48. For example, the locking shaft 36 is connected to the central tube 12, and the central tube 12 is shortened by twisting, so that the locking shaft 36 can be retracted into the first hinge member 30 to trigger the cradle locking mechanism 28. In other possible embodiments, the cradle release mechanism 48 is assembled from multiple mechanical components. Please refer to Figures 8 to 11 . Figure 8 and Fig. 9 FIG. 4 is a partial structural diagram of a cradle release mechanism 48 according to an embodiment of the present invention. Fig.10 and Fig.11Schematic diagrams of some components of the cradle release mechanism 48 according to an embodiment of the present invention at different viewing angles. The cradle release mechanism 48 may include a pull cord 50, a release member 52, and a protective member 54. The pull cord 50 is disposed in the central tube 12. One end of the pull cord 50 is connected to the locking shaft 36, and the other end of the pull cord 50 is connected to the release member 52. By pulling the pull cord 50, the release member 52 can pull the locking shaft 36 to retract the locking shaft 36 into the first hub 30.

[0075] In other possible embodiments, the first hinge member 30 can be tightly coupled to the central tube member 12, and the second hinge member 32 can rotate relative to the central tube member 12 in a counterclockwise direction. The first tube member 24 fixed to the first hinge member 30 and the second tube member 26 fixed to the second hinge member 32 can rotate relative to each other. The first hinge member 30 tightly coupled to the central tube member 12 can properly align the cradle release mechanism 48 and the pull rope 50 with the locking shaft member 36 of the cradle locking mechanism 28, thereby preventing the pull rope 50 from generating tension due to the relative rotation between the cradle release mechanism 48 and the locking shaft member 36.

[0076] In this embodiment, the release member 52 may include a handle 56 and a cushion portion 58 connected to each other. The handle 56 is an operation interface provided for the user to touch. The cushion portion 58 is slidably disposed on the central tube 12. The cushion portion 58 may have an opening 60. The inner surface of the cushion portion 58 may also have a rib 62, and the rib 62 is disposed beside the opening 60. The pull cord 50 may be fixed on the opening 60 and stop at the rib 62. The protective member 54 may be disposed on the central tube 12, and the handle 56 may be hidden under the shield 541 of the protective member 54 to avoid accidental touch. In this way, the user can apply force to the release member 52 to move the release member 52 to the direction opposite to the cradle locking mechanism 28. The cushion portion 58 of the release member 52 can pull the locking shaft 36 through the pull cord 50 to retract it into the first hub member 30, and the second hub member 32 can freely rotate relative to the first hub member 30.

[0077] See also Fig.12 and Fig.13 . Fig.12 and Fig.13 Schematic diagrams of the pull rope 50 and the release member 52 in different operation stages according to the embodiment of the present invention. Fig.12 As shown, the pull cord 50 can be divided into a first area 501, a second area 502, a third area 503 and a fourth area 504 connected to each other. The first area 501 and the fourth area 504 are two ends of the pull cord 50. The third area 503 is bent relative to the fourth area 504. The second area 502 is bent relative to the first area 501 and the third area 503, so that the first area 501 can be parallel to the third area 503. First, the first area 501 can be obliquely inserted into the opening 60 from the inner surface of the lining portion 58, as shown in FIG. Fig.12Then, the third area 503 can be rotated so that the second area 502 abuts against the groove structure of the rib 62, and the rib 62 can stably support the pull rope 50, such as Fig.13 shown.

[0078] See also Figures 12 to 17 . Fig.14 FIG. 4 is a schematic diagram of a locking shaft 36 according to an embodiment of the present invention. Figures 15 to 17 Schematic diagrams of the pull rope 50 and the locking shaft 36 in different operation stages according to the embodiment of the present invention. The locking shaft 36 may further include a main body 363 and a retaining rib 364. The protrusion 362 and the retaining rib 364 are respectively disposed on the first surface and the second surface of the main body 363. The first surface and the second surface are opposite to each other, for example, the first surface may be the inner surface 361, and the second surface may be the outer surface 365. In particular, the third tooth unit 46 may be disposed on the outer edge of the main body 363.

[0079] A channel 366 may be formed between the main body 363 and the protrusion 362. Fig.15 As shown, the other end of the pull rope 50 (i.e., the fourth region 504) can pass through the channel 366 to reach the second surface (i.e., the outer surface 365), and the third region 503 can be supported by the protrusion 362. Fig.16 As shown, the locking shaft 36 can be completely slid into the central tube 12 until the fourth section 504 of the pull cord 50 exceeds the retaining rib 364 and the outer surface 365. Fig.17 As shown, the locking shaft 36 can be rotated to a specific angle (eg, ninety degrees) so that the fourth region 504 abuts against the retaining rib 364 , so that the locking shaft 36 can fit tightly against the pull rope 50 .

[0080] See also Fig.18 and Fig.19 . Fig.18 and Fig.19 Schematic diagrams of cradle unlocking mechanisms 48' in other embodiments of the present invention at different operation stages. In this embodiment, components with the same number as those in the previous embodiment have the same structure and function, so they are not described again. The cradle unlocking mechanism 48' may include a pull cord 50, a release member 64, a handle 66, and a pressure member 68. The pull cord 50 may be disposed in the central tube 12. Both ends of the pull cord 50 may be connected to the locking shaft 36 and the release member 64, respectively. The release member 64 is rotatably disposed on the handle 66. The handle 66 may be disposed on the central tube 12. In addition, a pressure member 68 is movably disposed on the handle 66 to drive the release member 64 to generate a rotational action.

[0081] The release member 64 may be a rotating plate member having a protrusion 70. The protrusion 70 is detachably stopped against the pressure surface 72 of the pressure member 68. Fig.18As shown, the elastic member 38 moves the locking shaft member 36 away from the first hinge member 30. The pull rope 50 is tightened by the movement of the locking shaft member 36. At this time, the protrusion 70 pushes the pressure surface 72 to move the pressure member 68 partially out of the handle 66. Fig.19 As shown, when the pressure member 68 is pressed by the user, it can slide linearly relative to the handle 66. The pressure surface 72 pushes the protrusion 70, and the release member 64 can rotate relative to the handle 66 in the clockwise direction through the contact between the pressure surface 72 and the protrusion 70. The release member 64 can pull the pull rope 50 to retract the locking shaft member 36 into the first hub member 30, that is, the third tooth unit 46 of the locking shaft member 36 is separated from the second tooth unit 44 of the outer cover member 34.

[0082] In summary, the supporting tubes of each frame of the foldable infant cradle device can be folded and unfolded with each other through the connecting module and the connecting rod mechanism. The connecting module uses the cradle locking mechanism to adjust the relative movement between the first tube and the second tube. The locking shaft of the cradle locking mechanism can be slidably arranged between the first hub and the outer cover, and the first hub is fixed to the first tube, and the outer cover is fixed to the second hub arranged on the second tube. When the locking shaft assembled on the first hub engages with the outer cover, the rotation between the first hub and the second hub is restricted; when the locking shaft separates the outer cover, the rotation is no longer restricted and the first hub and the second hub can be freely rotated.

[0083] The foldable infant cradle device utilizes a cradle release mechanism disposed on a central tube to trigger the cradle locking mechanism. When the release member is triggered, the locking shaft member is pulled into the first pivot member through a pull rope; in addition, if the external force applied to the release member is removed, the locking shaft member can be moved out of the first pivot member through the action portion of the elastic member. The user can directly push the release member, or indirectly apply force to the release member through a pressure member, so as to separate the locking shaft member and the outer cover member. Compared with the prior art, the cradle locking mechanism and the cradle release mechanism of the present invention have the advantages of simple structure and convenient operation, so the foldable infant cradle device composed of them can be easily folded and unfolded, and the volume can be reduced for easy storage.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cradle locking mechanism for a foldable infant cradle device, characterized in that: The cradle locking mechanism comprises: The first hub piece; A second hinge member rotatably connected to the first hinge member via a rotation axis; a locking shaft, slidably disposed between the first hub and the second hub, the locking shaft being able to be completely received in the first hub to allow relative rotation between the first hub and the second hub, and the locking shaft being able to partially protrude from the first hub to limit the relative rotation between the first hub and the second hub; and One end of the link mechanism is connected to the locking shaft, wherein the link mechanism is positioned so that an external force applied to the link mechanism in a direction parallel to the rotation axis helps to receive the locking shaft into the first hub.

2. The cradle locking mechanism according to claim 1, characterized in that: The first hub member includes a first tooth unit, the second hub member includes a second tooth unit, and the locking shaft member includes a third tooth unit. The third tooth unit is engaged between the first tooth unit and the second tooth unit to limit the relative rotation.

3. The cradle locking mechanism according to claim 2, characterized in that: When the locking shaft is completely retracted into the first hinge member, the third tooth unit separates the second tooth unit, allowing the relative rotation between the first hinge member and the second hinge member to fold and unfold the foldable infant cradle device; when the locking shaft partially protrudes from the first hinge member, the third tooth unit engages the first tooth unit and the second tooth unit to limit the relative rotation to fix the mode of the foldable infant cradle device.

4. The cradle locking mechanism according to claim 2, characterized in that: When the second hub member rotates and switches between the folded position and the unfolded position, the second hub member rotates relative to the first hub member, and the third tooth unit does not engage with the second tooth unit. When the second hub member rotates to the folded position or the unfolded position, the third tooth unit engages with the first tooth unit and the second tooth unit at the same time.

5. The cradle locking mechanism according to claim 1, characterized in that: The cradle locking mechanism also includes: The elastic member is arranged between the first hinge member and the locking shaft member, and the elastic restoring force of the elastic member is used to drive the locking shaft member to move toward the second hinge member.

6. The cradle locking mechanism according to claim 5, characterized in that: The elastic member is a helical compression spring, one end of which abuts against the inner surface of the first hub member, and the other end of which is arranged on the protrusion of the locking shaft member.

7. The cradle locking mechanism according to claim 1, characterized in that: The first hub is mounted on the pipe, a drawstring is arranged in the pipe, one end of the drawstring is connected to the locking shaft, and the locking shaft is received into the first hub by a releasing member driven by the drawstring.

8. The cradle locking mechanism according to claim 1, characterized in that: The locking shaft comprises a main body, a protrusion and a retaining rib. The protrusion and the retaining rib are respectively arranged on a first surface and a second surface of the main body, and the first surface and the second surface are opposite to each other.

9. The cradle locking mechanism according to claim 8, characterized in that: The locking shaft member includes a third tooth unit disposed at the edge of the main body, and the third tooth unit is used to engage with the first tooth unit of the first hinge member and the second tooth unit of the second hinge member.

10. The cradle locking mechanism according to claim 8, characterized in that: A channel is formed between the main body and the protrusion, and the link mechanism is a pull rope. One end of the pull rope passes through the channel and extends to the second surface to abut against the retaining rib.

11. The cradle locking mechanism according to claim 2, characterized in that: The second hinge member includes a hinge body and an outer cover member, the outer cover member is fixedly connected to the hinge body to cover the first hinge member, and the second tooth unit is located inside the outer cover member.

12. The cradle locking mechanism according to claim 2, characterized in that: The second hinge member includes a hinge body and an outer cover member, the outer cover member is detachably connected to the hinge body, and the second tooth unit is located in the hinge body.

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