A folding bed

Abstract

The utility model belongs to the technical field of folding bed, especially relates to a folding bed, including bed frame, be provided with support leg and flexible bed surface on the bed frame, and the bed frame includes the leaning frame, bracket and leg frame that are rotationally connected in proper order, and the bed surface includes the backrest part, support part and leg rest part that are arranged on the leaning frame, bracket and leg frame in proper order, the leg frame includes the adjusting frame and the lifting frame that are rotationally connected, the adjusting frame is rotationally connected with the bracket, the lifting frame, adjusting frame and bracket can be horizontally unfolded, and the adjusting frame and the lifting frame connection end can swing upwards, and make the maximum height of leg rest part higher than the height of support part, be provided with second locking piece on the bracket, and second locking piece can support adjusting frame, and make the end of adjusting frame far from the bracket tilt upwards, be provided with third locking piece on the adjusting frame, and third locking piece can support lifting frame, and avoid lifting frame naturally droop, and the utility model discloses a kind of folding bed for providing the folding bed of convenient user use.

Description

Technical Field

[0001] This utility model belongs to the field of folding bed technology, and specifically refers to a folding bed. Background Technology

[0002] A folding bed is a simple bed designed using the principle of joints that can be folded and stored, saving space and making it easy to store.

[0003] Most folding beds on the market have a three-fold structure, which generally includes a backrest, a bracket, and legs connected in sequence. When the folding bed is stored, the backrest and legs can be folded into the bracket separately. For example, a folding bed disclosed in Chinese Utility Model Patent CN 202322261371.2 includes a bed frame and support legs at the lower end of the bed frame. The bed frame includes a backrest and a reclining frame. The front end of the reclining frame has a ratchet part, and the other end of the ratchet part is connected to the reclining frame. The support legs include a front support leg and a rear support leg. The backrest and reclining frame are provided with a pad. The front end of the pad is connected to the front end of the backrest and the rear end of the backrest is connected to the reclining frame. The front end of the pad is delayed to form a movable pillow. The other end of the pillow is provided with a pillow. A storage bag for placing items is provided on one side of the reclining frame.

[0004] Elevating the legs while sleeping helps promote blood circulation, relieve lower limb edema, and may improve lower back pressure. However, when using the folding bed mentioned above, the user's torso and legs are mostly on the frame. If the user needs to raise their legs, they need to use a pillow or cushion, which is inconvenient for the user. Utility Model Content

[0005] To overcome the shortcomings and problems of the existing technology, this utility model provides a folding bed that is convenient for users to use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A folding bed includes a bed frame with supporting legs and a flexible bed surface. The bed frame includes a backrest, a bracket, and a leg frame that are rotatably connected in sequence. The bed surface includes a backrest, a support portion, and a leg support portion that are rotatably disposed on the backrest, the bracket, and the leg frame. The leg frame includes an adjustment frame and a lifting frame that are rotatably connected. The adjustment frame and the bracket are rotatably connected. The lifting frame, the adjustment frame, and the bracket can be unfolded horizontally, and the connection end between the adjustment frame and the lifting frame can swing upward, so that the maximum height of the leg support portion is higher than the height of the support portion.

[0008] The bracket is provided with a second locking member, which can support the adjustment frame and tilt the end of the adjustment frame away from the bracket upward; the adjustment frame is provided with a third locking member, which can support the lifting frame and prevent the lifting frame from drooping naturally.

[0009] The present invention is further configured such that: the adjusting frame is provided with a second ratchet portion, the second locking member is rotatably mounted on the bracket, and the second locking member is provided with a second pawl portion, and the bracket is provided with a second elastic member, the second elastic member drives the second locking member to reset and make the second pawl portion engage with the second ratchet portion, thereby restricting the adjusting frame and the bracket from unfolding relative to each other, and the adjusting frame is movably provided with a second driving block, the second driving block can drive the second pawl portion to separate from the second ratchet portion, thereby allowing the adjusting frame and the bracket to rotate freely.

[0010] The present invention is further configured such that: the second drive block is rotatably mounted on the adjustment frame, and the adjustment frame or the second drive block is provided with a second drive part; the second drive part can drive the second drive block to rotate, and cause the second drive block to drive the second pawl part to separate from the second ratchet part.

[0011] The present invention is further configured such that: a second driving part is provided on the adjusting frame, a driving groove is provided on the second driving block, and the second driving part is disposed in the driving groove; the adjusting frame is controlled to flip and fold towards the bracket, the second driving part can abut against the side wall of the driving groove and drive the second driving block to move, and the second driving block can drive the second pawl part to separate from the second ratchet part.

[0012] The present invention is further configured such that: a swing groove is provided on the lifting frame, a third locking member is inserted into the swing groove, a first limiting wall is provided on the side of the swing groove, and the third locking member can abut against the first limiting wall and support the lifting frame.

[0013] The present invention is further configured such that: a second limiting wall is provided on the side of the swing groove, and a third locking member can abut against the second limiting wall to allow the lifting frame and the adjusting frame to unfold horizontally.

[0014] The present invention is further configured such that: the support leg includes a first support leg, a second support leg, and a third support leg, the first support leg, the second support leg, and the third support leg are respectively rotatably mounted on the backrest, the bracket, and the leg frame, controlling the backrest, the bracket, and the leg frame to unfold horizontally, and the first support leg, the second support leg, and the third support leg can jointly support the bed frame; the bracket is provided with at least two sets of second support legs, controlling the backrest and the leg frame to tilt upwards, and the second support legs can support the bed frame individually.

[0015] The present invention is further configured such that: the support leg is provided with a support groove, the bed frame is provided with a support part connected to the support groove, the lower end of the support groove can abut against the support part and support the bed frame, and a limiting protrusion is provided on the side wall of the support groove, the limiting protrusion can restrict the relative movement of the support part in the support groove and prevent the support leg from flipping and folding towards the bed frame; under the action of external force, the support part can pass over the limiting protrusion, thereby allowing the support part to engage or disengage from the support groove.

[0016] The present invention is further configured such that: both the backrest and the support frame are U-shaped frames, the support frame includes two first side rods, two sets of second support legs are rotatably connected to the two side rods, and the two first side rods are rotatably connected to both ends of the backrest respectively; the adjustment frame includes two second side rods, the two ends of the second side rods are rotatably connected to the end of the support frame and the first side rod respectively, and an auxiliary support rod is provided between the two second side rods, the auxiliary support rod being bent downward in the middle.

[0017] The present invention is further configured such that: the support frame is provided with a first ratchet part, the bracket is provided with a first pawl and a first elastic element, the first elastic element drives the first pawl to cooperate with the first ratchet part, thereby restricting the relative unfolding of the support frame and the bracket, and a first driving block is movably provided on the support frame, the first driving block can drive the first pawl to separate from the first ratchet part, thereby allowing the support frame and the bracket to rotate freely.

[0018] The advantages of this utility model compared to the prior art are:

[0019] 1. The leg support of this utility model includes an adjustable frame and a support frame that are rotatably connected. When in use, the adjustable frame can swing upward and raise the height of the support frame. When the user rests on the folding bed, there is no need for additional objects to support the legs, which is convenient for the user. In addition, the support frame, adjustable frame and support frame in this structure can be unfolded horizontally, which makes it convenient for the user to lie flat on the folding bed and allows the user to use the folding bed flexibly.

[0020] 2. The second ratchet and second pawl in this invention allow the adjusting frame and bracket to fold freely while restricting their free unfolding. This facilitates maintaining different unfolding states of the adjusting frame and bracket during use. The second drive block allows the user to control the free unfolding of the adjusting frame and bracket, enabling flexible adjustment of the support frame's height and allowing the user to adjust the folding bed as needed. The second drive unit on the adjusting frame or second drive block allows the user to control the relative unfolding of the adjusting frame and bracket, facilitating the use of the folding bed.

[0021] 3. The structure of the swing groove and the first limiting wall in this utility model is simple, convenient for production and processing, and facilitates the stable support of the lifting frame by the adjustment frame during use. The arrangement of the first support leg, the second support leg, and the third support leg facilitates the stable support of the bed frame and allows users to use the folding bed flexibly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a diagram showing the usage state of this utility model;

[0024] Figure 3This is a diagram showing the folded state of the bed frame and support legs in this utility model;

[0025] Figure 4 This is an exploded view of the bed frame and support legs in this utility model;

[0026] Figure 5 This is a partial sectional view of the connection structure between the support and the bracket in this utility model;

[0027] Figure 6 This is a partial sectional view of the legs and brackets in the unfolded state of this utility model;

[0028] Figure 7 This is a partial sectional view of the leg bracket and support in use in this utility model;

[0029] Figure 8 This is a partial sectional view of the leg frame and bracket in the folded state of this utility model;

[0030] Figure 9 This is a schematic diagram of the structure of the adjustment frame in this utility model;

[0031] Figure 10 This is a partial structural schematic diagram of the second support leg in this utility model;

[0032] Figure 11 This is a schematic diagram of the structure of the first driving block in this utility model.

[0033] In the diagram: 1-Backrest; 11-First ratchet part; 12-First drive part; 2-Bracket; 21-First side bar; 3-Legs; 31-Adjustment frame; 32-Lifting frame; 33-Swing groove; 34-Third locking element; 35-Second side bar; 36-Auxiliary support rod; 311-Second ratchet part; 312-Second drive part; 4-Bed surface; 41-Backrest; 42-Support part; 43-Leg support part; 5-First support leg; 51-Second support leg; 52-Third support leg; 511-Support groove; 512-Limiting protrusion; 513-Hinge part; 6-First drive block; 61-Second drive block; 62-Drive groove; 63-Protrusion; 7-First pawl; 71-Second locking element; 8-First elastic element; 81-Second elastic element. Detailed Implementation

[0034] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] like Figures 1 to 11As shown, a folding bed includes a bed frame with supporting legs and a flexible bed surface 4. The bed frame includes a backrest 1, a bracket 2, and a leg support 3 connected in sequence. The bed surface 4 includes a backrest 41, a support portion 42, and a leg support portion 43, which are sequentially arranged on the backrest 1, the bracket 2, and the leg support 3. The leg support 3 includes an adjustable frame 31 and a lifting frame 32 connected in sequence. The adjustable frame 31 is rotatably connected to the bracket 2. The lifting frame 32, the adjustable frame 31, and the bracket 2 can be unfolded horizontally, and the connection end between the adjustable frame 31 and the lifting frame 32 can swing upward, so that the maximum height of the leg support portion 43 is higher than the height of the support portion 42. The bracket 2 is provided with a second locking member 71, which can support the adjustable frame 31 and tilt the end of the adjustable frame 31 away from the bracket 2 upward. The adjustable frame 31 is provided with a third locking member 34, which can support the lifting frame 32 and prevent the lifting frame 32 from drooping naturally. In this structure, the leg support 3 includes an adjustable frame 31 and a support frame 32 that are rotatably connected. When in use, the adjustable frame 31 can swing upward and raise the height of the support frame 32. When the user rests on the folding bed, no additional object is needed to support the legs, making it convenient for the user. In addition, the support frame 32, the adjustable frame 31, and the support frame 2 can be unfolded horizontally, making it convenient for the user to lie flat on the folding bed and allowing for flexible use of the folding bed.

[0036] In this utility model, the second locking member 71 and the third locking member 34 can be fasteners. The second locking member 71 can fix the adjusting frame 31 and the bracket 2 relative to each other, and the third locking member 34 can fix the adjusting frame 31 and the lifting frame 32 relative to each other. This structure is a common technical means in mechanics. Therefore, although this technical solution is not shown in the accompanying drawings of this utility model, those skilled in the art can implement this technical solution based on their own knowledge.

[0037] Preferably, the adjusting frame 31 of this utility model is provided with a second ratchet part 311, the second locking member 71 is rotatably disposed on the bracket 2, and the second locking member 71 is provided with a second pawl part, and the bracket 2 is provided with a second elastic member 81. The second elastic member 81 drives the second locking member 71 to reset and make the second pawl part cooperate with the second ratchet part 311, thereby restricting the adjusting frame 31 and the bracket 2 from unfolding relative to each other. The adjusting frame 31 is movably provided with a second driving block 61, which can drive the second pawl part to separate from the second ratchet part 311, thereby allowing the adjusting frame 31 and the bracket 2 to rotate freely. The second ratchet part 311 and the second pawl part allow the adjustment frame 31 to be folded freely with the bracket 2, and restrict the free unfolding of the adjustment frame 31 and the bracket 2. This makes it easy for the adjustment frame 31 and the bracket 2 to maintain different unfolding states during use. The second drive block 61 makes it easy for the user to control the free unfolding of the adjustment frame 31 and the bracket 2, and allows the user to flexibly adjust the height of the lifting frame 32. This makes it easy for the user to adjust the folding bed as needed, and makes it convenient for the user to use.

[0038] The second drive block 61 is rotatably mounted on the adjustment frame 31, and the adjustment frame 31 or the second drive block 61 is provided with a second drive part 312; the second drive part 312 can drive the second drive block 61 to rotate, and cause the second drive block 61 to drive the second pawl part to separate from the second ratchet part 311. This structure makes it convenient for the user to control the separation of the second pawl part from the second ratchet part 311 through the second drive block 61, making it convenient for the user to adjust the folding bed.

[0039] In this embodiment, the adjusting frame 31 is provided with a second driving part 312, and the second driving block 61 is provided with a driving groove 62. The second driving part 312 is disposed in the driving groove 62. When the adjusting frame 31 is controlled to flip and fold towards the bracket 2, the second driving part 312 can abut against the side wall of the driving groove 62 and drive the second driving block 61 to move. The second driving block 61 can drive the second pawl part and the second ratchet part 311 to separate. In this structure, the user does not need to drive the second driving block 61 to move separately, which is convenient for the user to adjust the folding bed. In this utility model, it is preferred that when the adjusting frame 31 and the bracket 2 are unfolded relative to each other, the second driving part 312 moves in the driving groove 62. When the adjusting frame 31 and the bracket 2 are fully unfolded, the side wall of the driving groove 62 can drive the second driving block 61 to rotate, thereby moving the second driving block 61 away from the second pawl part. The second elastic member 81 can drive the second pawl part to engage with the second ratchet part 311.

[0040] In this invention, the second drive block 61 is provided with a protrusion 63 for driving the second pawl part and the second ratchet part 311 to separate. In this structure, when the adjusting frame 31 and the bracket 2 are folded relative to each other, the second drive part 312 drives the second drive block 61 to move and separates the second pawl part and the second ratchet part 311. At this time, the adjusting frame 31 and the bracket 2 can rotate freely. When the adjusting frame 31 and the bracket 2 are unfolded relative to each other, the second drive part 312 drives the second drive block 61 to move and engages the second pawl part and the second ratchet part 311. At this time, the adjusting frame 31 can only be flipped and folded towards the bracket 2. The user can adjust the relative angle between the adjusting frame 31 and the bracket 2 as needed.

[0041] The backrest 1 of this invention is provided with a first ratchet portion 11, and the bracket 2 is provided with a first pawl 7 and a first elastic element 8. The first elastic element 8 drives the first pawl 7 to engage with the first ratchet portion 11, thereby restricting the relative unfolding of the backrest 1 and the bracket 2. A first driving block 6 is movably provided on the backrest 1, which can drive the first pawl 7 to separate from the first ratchet portion 11, allowing the backrest 1 and the bracket 2 to rotate freely. This structure facilitates the user's adjustment of the relative angle between the backrest 1 and the bracket 2, making it convenient for the user to use the folding bed. The structures of the first ratchet portion 11, the first pawl 7, the first elastic element 8, and the first driving block 6 in this structure are similar to or the same as the structures of the second ratchet portion 311, the second pawl portion, the second elastic element 81, and the second driving block 61. The backrest 1 is provided with a first driving portion 12 for driving the first driving block 6. The first driving portion 12 has the same or similar structure as the second driving portion 312, and the adjustment method of the backrest 1 is also the same as the adjustment method of the adjustment frame 31.

[0042] The lifting frame 32 is provided with a swing groove 33, and a third locking member 34 is inserted into the swing groove 33. A first limiting wall is provided on the side of the swing groove 33. The third locking member 34 can abut against the first limiting wall and support the lifting frame 32. The structure of the swing groove 33 and the first limiting wall is simple, convenient for production and processing, and facilitates the stable support of the lifting frame 32 by the adjusting frame 31 during use.

[0043] Preferably, a second limiting wall is provided on the side of the swing groove 33, and the third locking member 34 can abut against the second limiting wall to allow the lifting frame 32 and the adjusting frame 31 to unfold horizontally. The provision of the second limiting wall facilitates the stable unfolding of the lifting frame 32 by the adjusting frame 31. In this embodiment, the swing groove 33 is an arc-shaped groove, and the first limiting wall and the second limiting wall are the side walls at both ends of the arc-shaped groove, respectively. Although the first limiting wall and the second limiting wall are not specifically marked in the accompanying drawings, those skilled in the art can understand this technical solution.

[0044] The support legs include a first support leg 5, a second support leg 51, and a third support leg 52. These three legs are rotatably mounted on the backrest 1, the bracket 2, and the leg frame 3, respectively, controlling the backrest 1, the bracket 2, and the leg frame 3 to unfold horizontally. The first, second, and third support legs 51 and 52 together provide support for the bed frame. At least two sets of second support legs 51 are provided on the bracket 2, controlling the backrest 1 and the leg frame 3 to tilt upwards. Each second support leg 51 can individually support the bed frame. The arrangement of the first, second, and third support legs 52 facilitates stable support of the bed frame and allows users to use the folding bed flexibly.

[0045] The support leg of this invention is provided with a support groove 511, and a hinge part 513 is provided on the side of the support groove 511 for rotatable connection with the bed frame. The bed frame is provided with a connecting part connected to the support groove 511. The lower end of the support groove 511 can abut against the connecting part and support the bed frame. A limiting protrusion 512 is provided on the side wall of the support groove 511. The limiting protrusion 512 can restrict the relative movement of the connecting part in the support groove 511 and prevent the support leg from flipping and folding towards the bed frame. Under the action of external force, the connecting part can pass over the limiting protrusion 512, thereby allowing the connecting part to engage or disengage from the support groove 511. This structure facilitates the stable unfolding of the support leg and the bed frame, prevents the support leg and the bed frame from rotating freely during the use or adjustment of the folding bed, and makes it convenient for the user to unfold the folding bed.

[0046] Both the backrest 1 and the support frame 32 are U-shaped frames. The support frame 2 includes two first side rods 21, and two sets of second support legs 51 are rotatably connected to the two side rods. The two first side rods 21 are rotatably connected to both ends of the backrest 1. The adjustment frame 31 includes two second side rods 35, and the two ends of the second side rods 35 are rotatably connected to the ends of the support frame 32 and the first side rods 21, respectively. An auxiliary support rod 36 is provided between the two second side rods 35. This structure helps to improve the structural strength of the bed frame and prevents the two second side rods 35 from approaching each other during use. In this embodiment, the auxiliary support rod 36 is bent downward in the middle. This structure can prevent the bed surface 4 from contacting the auxiliary support rod 36 during deformation, which helps to improve the comfort of the folding bed.

[0047] In this embodiment, the connecting part is the part where the backrest 1, the lifting frame 32, the first side rod 21 and the second side rod 35 pass into the support groove 511. It has no obvious range, but those skilled in the art can understand this technical solution.

[0048] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A folding bed, comprising a bed frame, on which support legs and a flexible bed surface (4) are provided, the bed frame comprising a backrest (1), a bracket (2) and a leg support (3) connected in sequence, and the bed surface (4) comprising a backrest (41), a support portion (42) and a leg support portion (43) arranged in sequence on the backrest (1), the bracket (2) and the leg support (3), characterized in that: The leg support (3) includes an adjusting frame (31) and a support frame (32) that are rotatably connected. The adjusting frame (31) is rotatably connected to the support frame (2). The support frame (32), the adjusting frame (31) and the support frame (2) can be horizontally unfolded. The connecting end of the adjusting frame (31) and the support frame (32) can swing upward, so that the maximum height of the leg support (43) is higher than the height of the support (42). The bracket (2) is provided with a second locking member (71), which can support the adjusting frame (31) and tilt the adjusting frame (31) upward away from the bracket (2); the adjusting frame (31) is provided with a third locking member (34), which can support the lifting frame (32) and prevent the lifting frame (32) from drooping naturally.

2. A folding bed according to claim 1, characterized in that: The adjusting frame (31) is provided with a second ratchet part (311), and a second locking member (71) is rotatably mounted on the bracket (2). The second locking member (71) is provided with a second pawl part, and the bracket (2) is provided with a second elastic member (81). The second elastic member (81) drives the second locking member (71) to reset and makes the second pawl part cooperate with the second ratchet part (311), thereby restricting the adjusting frame (31) and the bracket (2) from unfolding relative to each other. A second driving block (61) is movably mounted on the adjusting frame (31). The second driving block (61) can drive the second pawl part and the second ratchet part (311) to separate, thereby allowing the adjusting frame (31) and the bracket (2) to rotate freely.

3. A folding bed according to claim 2, characterized in that: The second drive block (61) is rotatably mounted on the adjustment frame (31), and the adjustment frame (31) or the second drive block (61) is provided with a second drive part (312); the second drive part (312) can drive the second drive block (61) to rotate, and cause the second drive block (61) to drive the second pawl part to separate from the second ratchet part (311).

4. A folding bed according to claim 3, characterized in that: The adjustment frame (31) is provided with a second drive unit (312), and the second drive block (61) is provided with a drive groove (62). The second drive unit (312) is located in the drive groove (62). The adjustment frame (31) is controlled to flip and fold towards the bracket (2). The second drive unit (312) can abut against the side wall of the drive groove (62) and drive the second drive block (61) to move. The second drive block (61) can drive the second pawl part to separate from the second ratchet part (311).

5. A folding bed according to claim 1, 2, 3, or 4, characterized in that: The lifting frame (32) is provided with a swing groove (33), and a third locking member (34) is inserted into the swing groove (33). A first limiting wall is provided on the side of the swing groove (33), and the third locking member (34) can abut against the first limiting wall and support the lifting frame (32).

6. A folding bed according to claim 5, characterized in that: The swing groove (33) is provided with a second limiting wall on its side, and the third locking member (34) can abut against the second limiting wall to make the lifting frame (32) and the adjusting frame (31) unfold horizontally.

7. A folding bed according to claim 1, 2, 3, 4, or 6, characterized in that: The support legs include a first support leg (5), a second support leg (51), and a third support leg (52). The first support leg (5), the second support leg (51), and the third support leg (52) are rotatably mounted on the backrest (1), the bracket (2), and the leg frame (3), respectively, controlling the backrest (1), the bracket (2), and the leg frame (3) to unfold horizontally. The first support leg (5), the second support leg (51), and the third support leg (52) can jointly support the bed frame. The bracket (2) is provided with at least two sets of second support legs (51), controlling the backrest (1) and the leg frame (3) to tilt upwards. The second support leg (51) can support the bed frame individually.

8. A folding bed according to claim 7, characterized in that: The support leg is provided with a support groove (511), and the bed frame is provided with a connecting part that connects to the support groove (511). The lower end of the support groove (511) can abut against the connecting part and support the bed frame. The side wall of the support groove (511) is provided with a limiting protrusion (512). The limiting protrusion (512) can restrict the relative movement of the connecting part in the support groove (511) and prevent the support leg from flipping and folding towards the bed frame. Under the action of external force, the connecting part can pass over the limiting protrusion (512), so that the connecting part can cooperate with or disengage from the support groove (511).

9. A folding bed according to claim 7, characterized in that: Both the support frame (1) and the lifting frame (32) are U-shaped frames. The support frame (2) includes two first side rods (21), and two sets of second support legs (51) are rotatably connected to the two side rods. The two first side rods (21) are rotatably connected to both ends of the support frame (1). The adjusting frame (31) includes two second side rods (35). The two ends of the second side rods (35) are rotatably connected to the end of the lifting frame (32) and the first side rods (21) respectively. An auxiliary support rod (36) is provided between the two second side rods (35). The auxiliary support rod (36) is bent downward in the middle.

10. A folding bed according to claim 1, 2, 3, 4, 6, 8, or 9, characterized in that: The support frame (1) is provided with a first ratchet part (11), and the bracket (2) is provided with a first pawl (7) and a first elastic element (8). The first elastic element (8) drives the first pawl (7) to cooperate with the first ratchet part (11), thereby restricting the relative unfolding of the support frame (1) and the bracket (2). The support frame (1) is movably provided with a first driving block (6), which can drive the first pawl (7) to separate from the first ratchet part (11), thereby allowing the support frame (1) and the bracket (2) to rotate freely.

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