Game bed capable of being unfolded more stably
By introducing components such as guide sleeves, limit plates, and hooks into the children's play bed, the problem of support rod deviation was solved, achieving smooth unfolding and safe use of the play bed.
Patent Information
- Application Number
- CN202423229291.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing children's play beds are prone to misalignment of their four support rods when unfolded, leading to instability.
The design employs a four-set support rod structure, two sets of long folding rod structures, two sets of short folding rod structures, and a folding base. Through components such as guide sleeves, limiting plates, and hooks, it ensures that the chassis tube and support rods maintain the correct position during unfolding and folding.
This design ensures the play bed is stable when unfolded, preventing the support rods from deviating and guaranteeing safety and stability during use.
Smart Images
Figure CN223773431U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of children's products, specifically to a play bed that unfolds more smoothly. Background Technology
[0002] A children's playpen mainly consists of a playpen frame and a surrounding cloth. The cloth creates a safe play area for children, preventing them from climbing out and falling. Existing crib frames consist of four sets of support rods, four sets of folding support rods, and a folding base. The folding base of existing crib frames includes a connecting seat and four bottom support rods rotatably connected to the connecting seat at one end. These four bottom support rods form an "X" shape when connected to the connecting seat. When the connecting seat is lifted, the four bottom support rods fold upwards, resulting in a crib frame that is smaller at the bottom and larger at the top. Applying downward pressure to the connecting seat unfolds the crib. However, during unfolding, the four sets of support rods often shift, causing instability in the crib frame. Utility Model Content
[0003] This utility model provides a play bed that unfolds more smoothly. Its main purpose is to overcome the problem that the four sets of support rods in existing play beds often deviate when opened.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] A playbed that unfolds more smoothly includes four sets of support rod structures, two sets of long folding rail structures, two sets of short folding rail structures, and a folding base. The four sets of support rod structures are distributed at the four corners, the two sets of long folding rail structures are symmetrically arranged front and back, and the two sets of short folding rail structures are symmetrically arranged left and right. The long folding rail structures are located between the tops of two adjacent sets of support rod structures on the left and right, and the short folding rail structures are located between the tops of two adjacent sets of support rod structures on the front and back. The folding base includes a chassis, a guide seat, and four chassis tubes. The bottom of the chassis has a guide tube, and the top of the guide seat has a guide sleeve. The guide tube passes through the guide... The chassis tube and guide seat are movable along the guide sleeve. Each chassis tube corresponds to a set of support rod structures. One end of the chassis tube is hinged to the bottom of the support rod structure, and the other end of the chassis tube is hinged to the chassis. The outer periphery of the guide seat is provided with four first rod grooves, each first rod groove corresponding to one chassis tube. The four chassis tubes can be folded upward and unfolded downward as the chassis rises and falls. After being folded, the four chassis tubes are located in the corresponding first rod grooves. The two sets of long folding rod structures and the two sets of short folding rod structures fold downward and unfold upward as the chassis rises and falls. The four sets of support rod structures can move inward and unfold outward as the chassis rises and falls.
[0006] Furthermore, the guide tube is provided with two first strip-shaped grooves arranged front and back, and two limiting plates arranged front and back are provided inside the guide tube. The bottom of each of the two limiting plates is provided with an "n"-shaped shaft groove. A hook is provided between the two limiting plates. The top left end of the hook is hinged to the guide tube. The top right end of the hook is provided with a first pull rope groove. The right end of the hook is provided with a spring that abuts against it. The bottom left end of the hook is provided with an inclined surface. A limiting shaft is passed through the guide sleeve. The limiting shaft passes through the two first strip-shaped grooves and the "n"-shaped shaft grooves of the two limiting plates. The hook hooks onto the limiting shaft.
[0007] Furthermore, the top surface of the chassis is provided with a cover opening, the cover opening is provided with a chassis cover, the chassis cover is provided with a second pull rope groove that runs vertically through, the right end of the hook is provided with a spring abutment, and the spring is located between the spring abutment and the bottom surface of the chassis cover.
[0008] Furthermore, the folding base also includes two symmetrical support legs, one end of which is hinged to the chassis. The outer periphery of the guide seat is provided with two second rod grooves, each corresponding to one support leg. The two support legs can be folded upward and unfolded downward as the chassis rises and falls. After being folded, the two support legs are located in the corresponding second rod grooves.
[0009] Furthermore, the lower outer periphery of the guide sleeve is provided with two symmetrical hinge parts, the middle of the hinge parts is recessed inward, and the left and right ends of the hinge parts are provided with first hinge interfaces. The folding base also includes four first linkage pieces, one end of the first linkage piece is hinged to the base tube, and the other end of the first linkage piece is hinged in the first hinge interface.
[0010] Furthermore, the support rod structure includes a lower connector, a column, and a fixed corner. The fixed corner is located above the lower connector. The column connects the lower connector and the fixed corner. The lower connector has a second hinge interface with an upward opening. One end of the base tube is hinged to the second hinge interface. The bottom of the lower connector is provided with a roller. The fixed corner has a third hinge interface with a downward opening and a fourth hinge interface with a downward opening. The third hinge interface and the fourth hinge interface are arranged at 90°. The end of the long folding rod structure is hinged to the third hinge interface, and the end of the short folding rod structure is hinged to the fourth hinge interface.
[0011] Furthermore, the long folding rail structure includes a first hinge joint, two first upper rails, and two first lower rails. The two first upper rails are symmetrically arranged left and right. Two inverted U-shaped guide plates are hinged inside the first hinge joint. One end of the first upper rail passes through the U-shaped guide plate. The first hinge joint is provided with two sets of first guide grooves, each set of first guide grooves corresponding to one first upper rail. Each set of first guide grooves consists of two first guide grooves arranged front and rear. Each first guide groove includes a first inclined groove and a first locking groove communicating with the top of the first inclined groove. A first shaft is inserted into each set of first guide grooves. The first shaft passes through the first upper rail. The first hinge joint is provided with a first support shaft for supporting the first upper rail. The first support shaft passes through the bottom of the U-shaped guide plate. The two first lower rails are symmetrically arranged left and right. One end of the first lower rail passes through a first sleeve. The first hinge joint is provided with a second shaft. The second shaft passes through the first sleeve and one end of the first lower rail.
[0012] Furthermore, the first hinge joint has two second strip-shaped grooves arranged front to back in the middle, and two sets of grooves arranged left to right in the bottom of the first hinge joint. Each set of grooves corresponds to a first lower support rod. One end of the first lower support rod is provided with a third shaft rod, which is located in the groove. A fourth shaft rod is provided between the two second strip-shaped grooves. Two second linkage plates are provided on one side of the first hinge joint. Each second linkage plate corresponds to a first lower support rod. The fourth shaft rod passes through the top of the two second linkage plates, and the third shaft rod passes through the bottom of the corresponding second linkage plate.
[0013] Furthermore, the short folding bar structure includes a second hinge joint, two second upper bars, and two second lower bars. The two second upper bars are symmetrically arranged front to back. The second hinge joint is provided with two sets of second guide grooves, each set of second guide grooves corresponding to one second upper bar. Each set of second guide grooves consists of two second guide grooves arranged left to right. Each second guide groove includes a second inclined groove and a second locking groove communicating with the top of the second inclined groove. A fifth shaft is inserted in each set of second guide grooves. A tube plug is provided in one end of the second upper bar. The fifth shaft passes through the second upper bar and the tube plug. The second hinge joint is provided with a second support shaft for supporting the second upper bar. The two second lower bars are symmetrically arranged front to back. One end of the second lower bar passes through a second tube sleeve. A sixth shaft passes through the second hinge joint. The sixth shaft passes through the second tube sleeve and one end of the second lower bar.
[0014] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages: when the play bed needs to be folded, the chassis is pulled upward, and the four chassis tubes can be folded upward as the chassis rises. The two sets of long folding rail structures and the two sets of short folding rail structures fold downward as the chassis rises. The four sets of support rod structures can move inward as the chassis rises. After the four chassis tubes are folded, they are located in the corresponding first rod groove, so that the four chassis tubes can be limited after folding. When the play bed needs to be unfolded, it is opened to a shape that is smaller at the bottom and larger at the top. Then, pressure is applied downwards to the base, and the four base tubes unfold downwards as the base descends. The two sets of long folding side rails and the two sets of short folding side rails unfold upwards as the base descends. The four sets of support rods unfold outwards as the base descends. During the unfolding process, the first rod groove guides the unfolding of the four base tubes, ensuring that the four base tubes and the four sets of support rods do not deviate during the unfolding process, making the play bed more stable when opened. Attached Figure Description
[0015] Figure 1 This is a structural diagram of the present invention.
[0016] Figure 2 This is an exploded view of the support rod structure of this utility model.
[0017] Figure 3 This is a structural diagram of the folding base of this utility model.
[0018] Figure 4 This is an exploded view of the folding base of this utility model.
[0019] Figure 5 This is a structural diagram of the chassis of this utility model.
[0020] Figure 6 This is a structural diagram of the long folding fence structure of this utility model.
[0021] Figure 7 This is an exploded view of the long folding fence structure of this utility model.
[0022] Figure 8 This is a structural diagram of the short folding fence structure of this utility model.
[0023] Figure 9 This is an exploded view of the short folding fence structure of this utility model. Detailed Implementation
[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0025] Reference Figure 1 , Figure 3 and Figure 4 A play bed that unfolds more smoothly includes four sets of support rod structures 1, two sets of long folding rail structures 2, two sets of short folding rail structures 3, and a folding base 4. The four sets of support rod structures 1 are distributed at the four corners. The two sets of long folding rail structures 2 are symmetrically arranged front and back, and the two sets of short folding rail structures 3 are symmetrically arranged left and right. The long folding rail structures 2 are located between the tops of two adjacent sets of support rod structures 1 on the left and right, and the short folding rail structures 3 are located between the tops of two adjacent sets of support rod structures 1 on the front and back. The folding base 4 includes a chassis 5, a guide seat 6, and four chassis tubes 7. The bottom of the chassis 5 is provided with a guide tube 51, and the top of the guide seat 6 is provided with a guide sleeve 61. The guide tube 51 passes through the guide sleeve 61 and the guide seat 6 and can rise and fall along the guide sleeve 61. Each chassis tube 7 corresponds to a set of support rod structures 1. One end of the chassis tube 7 is hinged to the bottom of the support rod structure 1, and the other end of the chassis tube 7 is hinged to the chassis 5. The guide seat 6 has four first rod grooves 62 on its outer periphery. Each first rod groove 62 corresponds to a base plate tube 7. The four base plate tubes 7 can be folded upward and unfolded downward as the base plate 5 rises and falls. After being folded, the four base plate tubes 7 are located in the corresponding first rod grooves 62. The two sets of long folding rod structures 2 and the two sets of short folding rod structures 3 can be folded downward and unfolded upward as the base plate 5 rises and falls. The four sets of support rod structures 1 can be moved inward and unfolded outward as the base plate 5 rises and falls.
[0026] Reference Figures 3 to 5The guide tube 51 has two first strip grooves 52 arranged front to back. Two limiting plates 53 are arranged front to back inside the guide tube 51. The bottom of each limiting plate 53 has an "n"-shaped shaft groove 54. A hook 55 is provided between the two limiting plates 53. The top left end of the hook 55 is hinged to the guide tube 51. The top right end of the hook 55 has a first pull rope groove 56. The right end of the hook 55 has a spring 57 that abuts against it. The bottom left end of the hook 55 has an inclined surface 58. A limiting shaft 63 passes through the guide sleeve 61. The limiting shaft 63 passes through the two first strip grooves 52 and the "n"-shaped shaft grooves 54 of the two limiting plates 53. When the play bed is unfolded for use, the hook 55 hooks onto the limiting shaft 63.
[0027] Reference Figure 3 and Figure 4 The chassis 5 has a cover opening 59 on its top surface, and a chassis cover 50 is provided on the cover opening 59. The chassis cover 50 has a second pull rope groove 501 that runs vertically through it. The right end of the hook 55 has a spring abutment part 551, and the spring 57 is located between the spring abutment part 551 and the bottom surface of the chassis cover 50. A pull rope 561 is tied to the first pull rope groove 56, and the top of the pull rope 561 passes through the second pull rope groove 501. When the pull rope 561 is pulled upward, the hook 55 can rotate, causing the hook 55 to disengage from the limiting shaft 63. At the same time, the chassis 5 is also pulled upward, and the guide tube 51 can move upward along the guide sleeve 61. The first strip groove 52 is used to limit the movement distance of the chassis 5.
[0028] Reference Figure 3 and Figure 4 The folding base 4 also includes two symmetrical support legs 8. One end of the support legs 8 is hinged to the chassis 5. The outer periphery of the guide seat 6 is provided with two second rod grooves 64, each second rod groove 64 corresponding to one support leg 8. The two support legs 8 can be folded upward and unfolded downward as the chassis 5 rises and falls. After being folded, the two support legs 8 are located in the corresponding second rod grooves 64.
[0029] Reference Figure 3 and Figure 4 The guide sleeve 61 has two symmetrical hinge portions 65 on its lower outer periphery. The middle of each hinge portion 65 is recessed inward to provide space for the two support legs 8 after folding. Each hinge portion 65 has a first hinge interface 66 at its left and right ends. The folding base 4 also includes four first linkage pieces 9. One end of each first linkage piece 9 is hinged to the base tube 7, and the other end of each first linkage piece 9 is hinged within the first hinge interface 66.
[0030] Reference Figure 3 and Figure 4When the pull rope 561 pulls the chassis 5 upward or presses the chassis 5 downward, the four chassis tubes 7 and the two support legs 8 fold upward and unfold downward as the chassis 5 rises and falls. The four first linkage plates 9 provide orientation for the corresponding chassis tubes 7 when folding and unfolding, ensuring that the chassis tubes 7 are located in the corresponding first rod grooves 62 after folding and that the chassis tubes 7 unfold along the first rod grooves 62 when unfolding.
[0031] Reference Figure 1 and Figure 2 The support rod structure 1 includes a lower connector 11, a column 12, and a fixed corner 13. The fixed corner 13 is located above the lower connector 11. The column 12 connects the lower connector 11 and the fixed corner 13. The lower connector 11 has a second hinge interface 14 with an upward opening. One end of the base tube 7 is hinged to the second hinge interface 14. A roller 15 is provided at the bottom of the lower connector 11. The fixed corner 13 has a third hinge interface 16 with a downward opening and a fourth hinge interface with a downward opening (not shown in the figure due to view limitations). The third hinge interface 16 and the fourth hinge interface (not shown in the figure due to view limitations) are arranged at 90°. The end of the long folding fence structure 2 is hinged to the third hinge interface 16, and the end of the short folding fence structure 3 is hinged to the fourth hinge interface (not shown in the figure due to view limitations).
[0032] Reference Figure 1 , Figure 2 , Figure 6 and Figure 7The long folding parapet structure 2 includes a first hinge joint 21, two first upper parapets 22, and two first lower parapets 23. The two first upper parapets 22 are symmetrically arranged. Two inverted U-shaped guide plates 24 are hinged within the first hinge joint 21, and one end of each first upper parapet 22 passes through the U-shaped guide plate 24. The first hinge joint 21 is provided with two sets of first guide grooves 25, each set of first guide grooves 25 corresponding to one first upper parapet 22. Each set of first guide grooves 25 consists of two first guide grooves 25 arranged front and rear. Each first guide groove 25 includes a first inclined groove 251 and a first locking groove 252 communicating with the top of the first inclined groove 251. A first shaft 26 passes through each set of first guide grooves 25, and the first shaft 26 passes through the first upper parapet 22. The first hinge joint 21 is provided with a first support shaft 27 for supporting the first upper parapet 22, and the first support shaft 27 passes through the bottom of the U-shaped guide plate 24. Two first lower surrounding rods 23 are symmetrically arranged on the left and right sides. One end of the first lower surrounding rod 23 passes through a first sleeve 28. A second shaft 29 passes through the first hinge joint 21. The second shaft 29 passes through the first sleeve 28 and one end of the first lower surrounding rod 23. The first sleeve 28 is used to eliminate the gap between the first lower surrounding rod 23 and the interior of the first hinge joint 21. The other end of the first upper surrounding rod 22 and the other end of the first lower surrounding rod 23 are hinged in a third hinge interface 16.
[0033] Reference Figure 6 and Figure 7 The first hinge joint 21 has two second strip-shaped grooves 211 arranged front-to-back in the middle. The bottom of the first hinge joint 21 has two sets of grooves 212 arranged left-to-right. Each set of grooves 212 corresponds to a first lower support rod 23. One end of the first lower support rod 23 has a third shaft 231 located within the groove 212. A fourth shaft 213 is provided between the two second strip-shaped grooves 211. Two second linkage plates 214 are provided on one side of the first hinge joint 21. Each second linkage plate 214 corresponds to a first lower support rod 23. The fourth shaft 213 passes through the top of the two second linkage plates 214, and the third shaft 231 passes through the bottom of the corresponding second linkage plate 214.
[0034] Reference Figure 1 , Figure 2 , Figure 6 and Figure 7When the play bed is unfolded, the first axle 26 is located in the first slot 252, and the fourth axle 213 is located at the top of the two second strip slots 211. When the top of the column 12 expands outward, under the action of outward pulling force, the first axle 26 disengages from the first slot 252 and enters the first inclined slot 251. At this time, the first upper arm 22 and the first lower arm 23 can be folded. During the folding process of the first upper arm 22, the first axle 26 slides from top to bottom along the first inclined slot 251. The two second linkage plates 214 form a synchronization mechanism, so that the first upper arm 22 and the first lower arm 23 on the left and right sides of the long folding arm structure 2 can be folded and unfolded synchronously, so that the play bed is subjected to parallel forces when folding and unfolding, and will not tilt to one side.
[0035] Reference Figure 1 , Figure 2 , Figure 8 and Figure 9 The short folding rail structure 3 includes a second hinge joint 31, two second upper rails 32, and two second lower rails 33. The two second upper rails 32 are symmetrically arranged front and rear. The second hinge joint 31 is provided with two sets of second guide grooves 34, each set of second guide grooves 34 corresponding to one second upper rail 32. Each set of second guide grooves 34 consists of two second guide grooves 34 arranged left and right. Each second guide groove 34 includes a second inclined groove 341 and a second locking groove 342 communicating with the top of the second inclined groove 341. A fifth shaft 35 passes through each set of second guide grooves 34. A tube plug 36 is provided in one end of the second upper rail 32. The fifth shaft 35 passes through the second upper rail 32 and the tube plug 36. The second hinge joint 31 is provided with a second support shaft 37 for supporting the second upper rail 32. Two second lower surrounding rods 33 are symmetrically arranged front and rear. One end of each second lower surrounding rod 33 passes through a second sleeve 38. A sixth shaft 39 passes through the second hinge joint 31, with the sixth shaft 39 passing through one end of the second sleeve 38 and one end of the second lower surrounding rod 33. The plug 36 is used to strengthen one end of the second upper surrounding rod 32, and the second sleeve 38 is used to eliminate the gap between the second lower surrounding rod 33 and the interior of the second hinge joint 31. The other ends of the second upper surrounding rod 32 and the second lower surrounding rod 33 are hinged to a fourth hinge interface (not shown in the figure due to view limitations).
[0036] Reference Figure 1 , Figure 2 , Figure 8 and Figure 9When the play bed is unfolded, the fifth axle 35 is located in the second slot 342. When the top of the column 12 expands outward, the fifth axle 35 disengages from the second slot 342 and enters the second inclined groove 341 under the action of outward pulling force. At this time, the second upper rod 32 and the second lower rod 33 can be folded. During the folding process of the second upper rod 32, the fifth axle 35 slides from top to bottom along the second inclined groove 341.
[0037] Reference Figures 6 to 9 One end of the first lower band 23 has a first clearance space 231, one end of the second upper band 32 has a cut 321, the other end of the tube plug 36 is located in the cut 321, the other end of the tube plug 36 has a second clearance space 361, and one end of the second lower band 33 has a third clearance space 331. The first clearance space 231, the second clearance space 361, and the third clearance space 331 provide clearance for the first lower band 23, the second upper band 32, and the second lower band 33 after folding, making the first upper band 22, the first lower band 23, the second upper band 32, and the second lower band 33 more vertical after folding.
[0038] Reference Figures 1 to 9The design principle of this utility model is as follows: When the pull rope 561 is pulled upward, the hook 55 can rotate, causing the hook 55 to disengage from the limiting shaft 63. At the same time, the chassis 5 is also pulled upward, and the four chassis tubes 7 and the two support legs 8 fold upward as the chassis 5 rises. During the upward folding of the four chassis tubes 7, the bottoms of the four columns 12 move inward and the tops expand outward. The outward expansion of the tops of the four columns 12 pulls the first upper ring rod 22 and the second upper ring rod 32, causing the first shaft 26 to engage with the first slot. 252 disengages and enters the first inclined groove 251, and the fifth shaft 35 disengages from the second slot 342 and enters the second inclined groove 341. At this time, as the chassis 5 rises, the two sets of long folding rod structures 2 and the two sets of short folding rod structures 3 fold downward as the chassis 5 rises. The four sets of support rod structures 1 move inward as the chassis 5 rises. After the four chassis tubes 7 are folded, they are located in the corresponding first rod groove 62, and the two support leg rods 8 are located in the corresponding second rod groove 64, so that the four chassis tubes 7 and the two support leg rods 8 can be limited after folding. When the play bed needs to be unfolded, it is opened to a shape that is smaller at the bottom and larger at the top. Then, pressure is applied downwards to the base 5. The four base tubes 7 can unfold downwards as the base 5 descends. The two sets of long folding rail structures 2 and the two sets of short folding rail structures 3 unfold upwards as the base 5 descends. The four sets of support rod structures 1 can unfold outwards as the base 5 descends. During the unfolding process of the four base tubes 7 and the two support rods 8, the first rod groove 62 and the second rod groove 64 can respectively guide the unfolding of the corresponding base tubes 7 and support rods 8. When the play bed is unfolded into place, the hook 55 descends and the inclined surface 58 abuts against the limiting shaft 63, and the hook 55 re-hooks the limiting shaft 63.
[0039] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.
Claims
1. A play bed that unfolds more smoothly, characterized in that: The system includes four sets of support rod structures, two sets of long folding rod structures, two sets of short folding rod structures, and a folding base. The four sets of support rod structures are distributed at the four corners, the two sets of long folding rod structures are symmetrically arranged front to back, and the two sets of short folding rod structures are symmetrically arranged left to right. The long folding rod structures are located between the tops of two adjacent sets of support rod structures on the left and right, and the short folding rod structures are located between the tops of two adjacent sets of support rod structures on the front and back. The folding base includes a chassis, a guide seat, and four chassis tubes. The bottom of the chassis has a guide tube, and the top of the guide seat has a guide sleeve. The guide tube passes through the guide sleeve and the guide seat. It can also rise and fall along the guide sleeve. Each chassis tube corresponds to a set of support rod structures. One end of the chassis tube is hinged to the bottom of the support rod structure, and the other end of the chassis tube is hinged to the chassis. The outer periphery of the guide seat is provided with four first rod grooves, each first rod groove corresponding to one chassis tube. The four chassis tubes can fold upward and unfold downward as the chassis rises and falls. After folding, the four chassis tubes are located in the corresponding first rod grooves. The two sets of long folding rod structures and the two sets of short folding rod structures fold downward and unfold upward as the chassis rises and falls. The four sets of support rod structures can move inward and unfold outward as the chassis rises and falls.
2. The play bed that unfolds more smoothly as described in claim 1, characterized in that: The guide tube has two first strip-shaped grooves arranged front and back. The guide tube has two limiting plates arranged front and back. The bottom of each limiting plate has an "n"-shaped shaft groove. A hook is provided between the two limiting plates. The top left end of the hook is hinged to the guide tube. The top right end of the hook has a first pull rope groove. The right end of the hook has a spring that abuts against it. The bottom left end of the hook has an inclined surface. A limiting shaft is passed through the guide sleeve. The limiting shaft passes through the two first strip-shaped grooves and the "n"-shaped shaft grooves of the two limiting plates. The hook hooks onto the limiting shaft.
3. A play bed that unfolds more smoothly as described in claim 2, characterized in that: The top surface of the chassis is provided with a cover opening, the cover opening is provided with a chassis cover, the chassis cover is provided with a second pull rope groove that runs vertically through, the right end of the hook is provided with a spring abutment, and the spring is located between the spring abutment and the bottom surface of the chassis cover.
4. The play bed that unfolds more smoothly as described in claim 1, characterized in that: The folding base also includes two symmetrical support legs. One end of each support leg is hinged to the chassis. The outer periphery of the guide seat is provided with two second rod grooves, each second rod groove corresponding to one support leg. The two support legs can be folded upward and unfolded downward as the chassis rises and falls. After being folded, the two support legs are located in the corresponding second rod groove.
5. A play bed that unfolds more smoothly as described in claim 4, characterized in that: The lower outer periphery of the guide sleeve is provided with two symmetrical hinge parts. The middle part of the hinge part is recessed inward. The left and right ends of the hinge part are provided with first hinge interfaces. The folding base also includes four first linkage pieces. One end of the first linkage piece is hinged to the base tube, and the other end of the first linkage piece is hinged to the first hinge interface.
6. A play bed that unfolds more smoothly as described in claim 1, characterized in that: The support rod structure includes a lower connector, a column, and a fixed corner. The fixed corner is located above the lower connector. The column connects the lower connector and the fixed corner. The lower connector has a second hinge interface with an upward opening. One end of the base tube is hinged to the second hinge interface. The bottom of the lower connector is provided with a roller. The fixed corner has a third hinge interface with a downward opening and a fourth hinge interface with a downward opening. The third and fourth hinge interfaces are arranged at 90°. The end of the long folding rod structure is hinged to the third hinge interface, and the end of the short folding rod structure is hinged to the fourth hinge interface.
7. A play bed that unfolds more smoothly as described in claim 1, characterized in that: The long folding rail structure includes a first hinge joint, two first upper rails, and two first lower rails. The two first upper rails are symmetrically arranged. Two inverted U-shaped guide plates are hinged within the first hinge joint. One end of each first upper rail passes through the U-shaped guide plate. The first hinge joint has two sets of first guide grooves, each set corresponding to one first upper rail. Each set of first guide grooves consists of two first guide grooves arranged front to back. Each first guide groove includes a first inclined groove and a first locking groove communicating with the top of the first inclined groove. A first shaft passes through each set of first guide grooves and through the first upper rail. The first hinge joint has a first support shaft for supporting the first upper rails. The first support shaft passes through the bottom of the U-shaped guide plate. The two first lower rails are symmetrically arranged. One end of each first lower rail passes through a first sleeve. The first hinge joint has a second shaft that passes through the first sleeve and one end of each first lower rail.
8. A play bed that unfolds more smoothly as described in claim 7, characterized in that: The first hinge joint has two second strip-shaped grooves arranged front to back in the middle. The bottom of the first hinge joint has two sets of grooves arranged left to right. Each set of grooves corresponds to a first lower support rod. One end of the first lower support rod is provided with a third shaft rod, which is located in the groove. A fourth shaft rod is provided between the two second strip-shaped grooves. Two second linkage plates are provided on one side of the first hinge joint. Each second linkage plate corresponds to a first lower support rod. The fourth shaft rod passes through the top of the two second linkage plates, and the third shaft rod passes through the bottom of the corresponding second linkage plate.
9. A play bed that unfolds more smoothly as described in claim 1, characterized in that: The short folding bar structure includes a second hinge joint, two second upper bars, and two second lower bars. The two second upper bars are symmetrically arranged front to back. The second hinge joint has two sets of second guide grooves, each set corresponding to one second upper bar. Each set of second guide grooves consists of two second guide grooves arranged left to right. Each second guide groove includes a second inclined groove and a second locking groove communicating with the top of the second inclined groove. A fifth shaft is inserted into each set of second guide grooves. A tube plug is provided at one end of the second upper bar. The fifth shaft passes through the second upper bar and the tube plug. The second hinge joint has a second support shaft for supporting the second upper bars. The two second lower bars are symmetrically arranged front to back. One end of the second lower bar passes through a second tube sleeve. The second hinge joint has a sixth shaft, which passes through the second tube sleeve and one end of the second lower bar.