Child chair

Abstract

A child chair comprises a chair frame, the chair frame comprises a chair frame body and an enclosure frame arranged on the chair frame body, and the enclosure frame can be arranged in an angle adjusting mode and is at least locked at a first working position through an angle adjusting mechanism so that a seat can be detachably connected with the enclosure frame. A novel mounting and grafting mode is provided between the seat and the seat frame, the angle-adjustable enclosure frame is arranged on the seat frame, and the enclosure frame is rotated to an angle position to be fixed to form a first station position so as to be matched with the shape of the seat, so that the seat is convenient to erect, mount and graft, and when the seat is not mounted, the enclosure frame can be folded and folded, so that the seat is convenient to mount and graft. When the child chair frame is folded, the size of the folded child chair frame is reduced, and the enclosure frame can be unfolded to be used independently to form a safety enclosure, a toy frame and the like for children, so that the child chair frame is more harmonious in shape and has more use functions.

Description

Technical Field

[0001] The utility model relates to a children's chair. Background Art

[0002] In the prior art, a child chair generally comprises a seat and a chair frame. In order to achieve a small folded volume or to achieve multiple usage functions, the seat and the chair frame are arranged in a detachable installation manner.

[0003] For example, patent publication number CN218738136U discloses a multi-purpose children's dining chair, and patent publication number CN205131329U discloses a baby carriage seat clamping device, etc., both of which have sockets for installing and receiving seats on both sides of the chair frame. The two sides of the seat are plugged into and matched with the sockets, and are disassembled and assembled through a locking mechanism, so that when the seat is removed, the sockets on both sides are directly exposed and a gap is formed between the two, which affects the appearance and is not safe enough.

[0004] Therefore, it is necessary to design a new installation method between the seat and the chair frame, if it can avoid the socket being directly exposed and avoid the gap between the two when the seat is removed. It is even more desirable if it can also make the child chair frame more beautiful, safer, or add more functions. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a children's chair.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a children's chair, including a chair frame, the chair frame includes a chair frame body, and a surrounding frame arranged on the chair frame body, the surrounding frame can be angle-adjusted and locked in at least a first working position through an angle adjustment mechanism to allow a detachable connection between the seat and the surrounding frame.

[0007] In some embodiments, when the frame is in the first working position, at least the front portion of the frame is tilted forward and downward, allowing the front portion of the seat bottom to be detachably connected to the front portion of the frame, and / or the left and right sides of the seat to be detachably connected to the left and right sides of the frame, and / or the rear portion of the seat to be detachably connected to the rear portion of the frame. The frame can be a fixed whole that rotates relative to the chair frame and is tilted forward and downward as a whole, or it can be composed of front and back split parts, with only the front portion of the frame rotated forward and downward and then tilted to match the shape of the seat. The seat can be fixedly fitted to the frame from front to back, or it can be fitted to the frame from front to left and right, or it can be fitted to the frame from back to left and right.

[0008] In some embodiments, the seat bottom has a seat slot with an opening facing forward or facing forward and downward, and a seat stopper located below the seat slot, and when the seat is connected to the surrounding frame, a front crossbar at the front of the surrounding frame is inserted into the seat slot, and the seat stopper abuts against the bottom side of the front crossbar. The seat bottom and the front crossbar are snap-fitted.

[0009] In some embodiments, the rear portion of the seat and the rear portion of the surrounding frame are detachably connected through a rear lock mechanism, the rear lock mechanism comprising a lock hook mounted on the rear portion of the seat backrest through a lock hook shaft pivotally mounted thereon, the lock hook having a hook groove at a lower portion, a hook body located at a lower portion of the hook groove, and a pushing portion located at an upper opening portion of the hook groove, and also comprising a lock hook elastic member arranged between the lock hook and the backrest to cause the hook body to bounce backwards to a released position. During the locking process of the rear lock mechanism, the frame rear cross bar at the rear portion of the surrounding frame touches the pushing portion to cause the lock hook to overcome the elastic force of the lock hook elastic member and rotate until the hook body hooks the frame rear cross bar in a locked position, one of the frame rear cross bar and the hook body having a convex portion, and the other having a groove, and the convex portion is plugged into the groove in the locked position, the rear lock mechanism also comprising an unlocking handle movably arranged on the backrest, and a first elastic body that applies force to the unlocking handle to stably engage with the lock hook to prevent the hook body from bouncing backwards to release the frame rear cross bar. The seat back is provided with an elastic locking hook. When the seat is placed in the frame, the rear cross bar of the frame touches the upper part of the locking hook, causing it to automatically overcome the elastic force of the locking hook elastic member and rotate, so that the lower hook body of the locking hook automatically hooks the rear cross bar of the frame, and the unlocking handle is pressed into the locking hook under the action of the first elastic member to prevent it from resetting, thereby locking the seat back and the rear cross bar of the frame in a secure manner.

[0010] In some embodiments, the rear lock mechanism also includes a second lock button movably arranged on the top of the backrest, a second elastomer, a slide, and the first elastomer that are sequentially arranged between the second lock button and the unlocking handle, a second lock movably arranged on the backrest, and a second lock elastic member that is arranged between the second lock and the backrest and applies force to the second lock so that it can be snap-fitted with the slide and cannot move; the second lock button and the second lock are slidably fitted via an inclined surface, and when the second lock button is pressed, the second lock is driven to slide and disengage from the slide. The method of unlocking by pressing the unlocking handle alone is too direct and there is a risk of unlocking by mistake. A second lock is added. During normal locking, the second lock cooperates with the slider, the position of the slider is fixed, and the first elastic body under the slider presses the unlocking handle downward. Even if the unlocking handle is pressed manually, it cannot be pushed, so that the lock hook is locked stably. If you want to unlock, you must first press the second lock button, and the second lock button pushes the second lock to disengage from the slider. At this time, the first elastic member, the slider and the second elastic member constitute an elastic component, and the unlocking handle can be pressed. The elastic component allows the second lock button to move, thereby disengaging from the lock hook. Under the action of the lock hook elastic member, the lock hook bounces backward to release the rear cross bar of the frame, thereby unlocking the door. The lock is safe and avoids misoperation.

[0011] In some embodiments, the frame includes a front frame and a rear frame, the rear frame is fixed to the chair frame body, and the two ends of the front frame are respectively pivotally connected to the corresponding parts of the rear frame and locked by an angle adjustment mechanism, so that the front frame has at least a first working position tilted in the forward and downward direction.

[0012] In some embodiments, the rear frame includes a rear cross bar, a frame support rod formed by extending downward from both ends of the rear cross bar, and two angle adjustment seats respectively located on the left and right sides and fixed on the corresponding frame support rods and / or the rear cross bar, and the two ends of the front frame are respectively pivotally connected to the corresponding angle adjustment seats and locked by the angle adjustment mechanism.

[0013] In some embodiments, the surrounding frame further has a second working position relative to the chair frame body, in which the front portion of the surrounding frame extends forward.

[0014] In some embodiments, the chair frame body also includes a support platform that can be folded or disassembled, and the support platform is located below the frame. When the frame is in the second working position, the support platform forms a standing platform for the child to stand, and the frame constitutes a device for safely protecting the child's waist.

[0015] In some embodiments, the chair frame body further comprises:

[0016] Front support legs, the left and right upper ends of the front support legs are respectively connected to the frame support rods on the left and right sides of the frame;

[0017] The rear supporting legs, the two upper ends of the rear supporting legs are respectively pivotally connected to the front supporting legs, and the supporting platform is installed between the front supporting legs and the rear supporting legs.

[0018] One of the front side and the rear side of the support platform is detachably connected to the corresponding support leg through a platform lock mechanism, and the other is pivotally connected to the corresponding support leg.

[0019] At least one ladder pedal is fixedly connected, foldably connected or detachably connected to the front support leg and / or the rear support leg, and at least one ladder pedal is located below the side of the support platform. The front support leg, the rear support leg and the support platform form a triangle relationship, and the structure is simple. After the platform lock mechanism is disassembled, the three can be folded to reduce the volume. In the second working position, the child chair forms a ladder, the support platform forms a standing platform for the child to stand, and the enclosure frame forms a device for safely enclosing the child's waist.

[0020] Due to the application of the above technical scheme, the utility model has the following advantages compared with the prior art: the utility model provides a children's chair, which provides a new installation grafting method between the seat and the chair frame, and an angle-adjustable frame is arranged on the chair frame. The frame is rotated to an angle position and fixed to form a first working position so as to match the shape of the seat, thereby facilitating the installation and grafting of the seat; when the seat is not installed, the frame can be folded and collected to reduce the volume after folding, and the frame can also be unfolded and used alone to form a safety enclosure for children, a toy rack, etc., thereby making the shape of the children's chair frame more harmonious and adding more usage functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 This is a schematic diagram of the use status of the utility model climbing ladder;

[0022] Attached Figure 2 This is a schematic diagram of the use status of the children's dining chair of the utility model;

[0023] Attached Figure 3 This is a three-dimensional schematic diagram of the utility model seat and chair frame being disassembled;

[0024] Attached Figure 4 The process of installing the utility model seat on the chair frame Figure 1 ;

[0025] Attached Figure 5 The process of installing the utility model seat on the chair frame Figure 2 ;

[0026] Attached Figure 6 The process of installing the utility model seat on the chair frame Figure 3 ;

[0027] Attached Figure 7 The process of installing the utility model seat on the chair frame Figure 4 ;

[0028] Attached Figure 8 for Figure 6 A magnified schematic diagram;

[0029] Attached Fig. 9 for Figure 7 Schematic diagram of the cross section at point B;

[0030] Among them: 1. Chair frame; 11. Front support legs; 12. Rear support legs; 13. Support platform; 14. Ladder pedal;

[0031] 2. Surrounding frame; 21. Front surrounding frame; 21a. Front cross bar of frame; 22. Rear surrounding frame; 22a. Rear cross bar of frame; 22b. Surrounding frame support rod; 22c. Angle adjustment seat;

[0032] 30. rear lock mechanism; 31. lock hook; 31a. hook groove; 31b. hook body; 31c. push part; 32. unlock handle; 33. second lock button; 34a. first elastic body; 34b. slide; 34c. second elastic body; 35. second lock; 36. lock hook shaft;

[0033] 100. chair; 101. seat portion; 101a. seat slot; 101b. seat stop portion; 102. backrest; 103. dining tray. DETAILED DESCRIPTION

[0034] As shown in the accompanying drawings, a children's chair includes a chair frame, wherein the chair frame includes a chair frame body 1 and a surrounding frame 2 arranged on the chair frame body 1.

[0035] The frame 2 includes a front frame 21 and a rear frame 22. The two ends of the front frame 21 are pivotally connected to the corresponding parts of the rear frame 22 and the angle is locked by an angle adjustment mechanism, so that the front frame 21 has a first working position tilted forward and downward, allowing the seat 100 and the frame 2 to be detachably connected, a second working position where the front frame 21 is extended forward, and a third working position where it is folded.

[0036] The rear frame 22 includes a rear cross bar 22a, a frame support rod 22b formed by extending downward from both ends of the rear cross bar 22a, and two angle adjustment seats 22c respectively located on the left and right sides and fixed to the upper parts of the corresponding frame support rods 22b. The lower part of the frame support rod 22b is fixed to the chair frame body 1, and the two ends of the front frame 21 are respectively pivotally connected to the corresponding angle adjustment seats 22c and locked by an angle adjustment mechanism.

[0037] The angle adjustment mechanism is not the key point of the invention of this scheme. Any mechanism that can lock two rotating parts can be applied, such as the common sliding tooth block mechanism, including a first locking groove opened on the angle adjustment seat 22c, a second locking groove opened on the end of the front frame 21, a button slidably arranged on the end of the front frame, and a tooth block elastic member located in the first locking groove and abutting on one side of the sliding tooth block, and the button abutting on the other side of the sliding tooth block. Pressing the button allows it to overcome the elastic member and completely enter the first locking groove to unlock the door, so that the front frame 21 can rotate relative to the rear frame 22.

[0038] As attached Figure 2 As shown, the surrounding frame 2 is in the first working position, the front surrounding frame 21 is tilted forward and downward and locked, the front bottom of the seat 100 is buckled on the front cross bar 21a of the frame, and the rear of the seat 100 is detachably connected to the rear of the surrounding frame 2 through the rear locking mechanism 30.

[0039] The detailed structure is as follows:

[0040] The bottom of the seat 100 has a seat slot 101a with an opening facing forward or facing forward and downward, and a seat stopper 101b located below the seat slot 101a. When the seat 100 is connected to the frame 2, the front cross bar 21a at the front of the frame 2 is inserted into the seat slot 101a, and the seat stopper 101b is against the bottom side of the front cross bar 21a.

[0041] As attached Figure 8 As shown, the rear lock mechanism 30 includes a lock hook 31 pivotally mounted at the rear of the backrest 102 of the seat 100 through a lock hook shaft 36, the lock hook 31 has a hook groove 31a at the lower part, a hook body 31b located at the lower part of the hook groove 31a, and a pushing portion 31c located at the upper opening of the hook groove 31a (not shown), and also includes a lock hook elastic member arranged between the lock hook 31 and the backrest 102 to make the hook body 31b bounce back to a released position. When the rear lock mechanism 30 is locked, the rear cross bar 22a at the rear of the surrounding frame 2 touches the pushing portion 31c, prompting the lock hook 31 to overcome the elastic force of the lock hook elastic member and rotate until the hook body 31b hooks the rear cross bar 22a at the locked position, as shown in the attached figure. Figure 3 , 9 As shown, the middle part of the rear crossbar 22a of the frame has a convex part convex downward, and the middle part of the hook body 31b has a groove. The lower convex part and the groove are plugged and matched in the locking position, and cannot move left and right.

[0042] The rear lock mechanism 30 also includes an unlocking handle 32 slidably disposed on the backrest 102, a second lock button 33 slidably disposed on the top of the backrest 102, a second elastic body 34c, a sliding member 34b, and a first elastic body 34a disposed in sequence from top to bottom between the second lock button 33 and the unlocking handle 32, and a second lock 35 slidably disposed on the backrest 102, and a second lock elastic member disposed between the second lock 35 and the backrest 102 to apply force to the second lock 35 so that it is snap-fitted with the sliding member 34b and cannot move upward, and the second lock button 33 3 and the second lock 35 are slidably matched through the slope. When the second lock button 33 is pressed, the second lock 35 can be driven to slide and thus disengage from the slide 34b. At this time, the unlocking handle 32 is pressed upward to apply force. The first elastic member, the slide and the second elastic member form an integral elastic component that is compressed upward, and the unlocking handle 32 is disengaged from the upper part of the lock hook 31. The lock hook bounces back under the action of the lock hook elastic member to release the rear cross bar of the frame, thereby unlocking. That is, the second lock button 33 must be pressed first, and then the unlocking handle 32 can be pressed to unlock the lock hook, which is safe and avoids misoperation. It is stably engaged with the lock hook 31 to prevent the hook body 31b from bouncing back to release the first elastic body 34a of the rear cross bar 22a of the frame.

[0043] During the locking process, the rear locking mechanism 30 is automatically locked. Figure 4 As shown, first align the seat slot 101a of the seat 100 downwardly with the front crossbar 21a of the frame and insert it. Figure 5-6 As shown, the seat 100 is then rotated backward around the front crossbar 21a of the frame, as shown in the attached Figure 8 As shown in the figure, when the rear cross bar 22a of the frame touches the pushing portion 31c, the lock hook 31 is forced to overcome the elastic force of the lock hook elastic member and rotate. Figure 7 As shown, until the hook body 31b hooks the rear cross bar 22a of the frame and is in the locked position, at this time, the overall elastic assembly composed of the first elastic member, the sliding member and the second elastic member pushes the unlocking handle 32 downward, and during the rotation of the lock hook 31, the locking head at the lower part of the unlocking handle 32 moves along the upper arc surface of the lock hook 31 and automatically snaps into the recessed position, thereby positioning the lock hook 31, and without applying force to the second lock button 33, the second lock 35 automatically snaps into the sliding member 34b under the action of the elastic force, thereby locking the position of the sliding member 34b, and at this time, the space that the unlocking handle 32 can slide upward is not enough to disengage from the lock hook, so pressing the unlocking handle 32 upward alone cannot unlock the door.

[0044] In this embodiment, as shown in the attached Figure 2-7 As shown, the upper frame of the chair frame is placed in the first position to match the shape of the seat, so that the seat frame is installed and grafted to form a children's dining chair. After the seat is removed, as shown in the attached Figure 1As shown, the front part of the frame is unfolded forward to form a safety enclosure for children. Combined with the support platform 13 and the ladder pedal 14 below, it can be used as a climbing ladder. The structure is reasonably designed and the seat is easy to install. No matter what state it is in, the shape is more harmonious. The detailed structure is as follows:

[0045] The chair frame body 1 also includes:

[0046] The front supporting leg 11, the left and right upper ends of the front supporting leg 11 are respectively connected to the frame support rods 22b on the left and right sides of the frame 2;

[0047] The rear supporting legs 12, the two upper ends of the rear supporting legs 12 are respectively pivotally connected to the front supporting legs 11, and the supporting platform 13 is installed between the front supporting legs 11 and the rear supporting legs 12.

[0048] The front side of the support platform 13 is detachably connected to the corresponding front support leg through a platform lock mechanism, and the other is pivotally connected to the rear support leg.

[0049] A ladder pedal 14 is fixedly connected to the front support leg 11 and is located below the front side of the support platform 13 to form a ladder.

[0050] In this embodiment, the front supporting leg 11 and the rear supporting leg 12 are respectively in a U shape, with good left and right rigidity, and an H shape is also acceptable.

[0051] In this embodiment, the support platform 13 is located below the surrounding frame 2, and the front part of the support platform 13 is detachably connected between the left and right sides of the front support legs 11. The inner sides of the vertical rods on the two side parts of the front support legs 11 are respectively fixed with mounting brackets, and the mounting brackets include a tubular support platform body extending left and right. The two side parts of the support platform 13 respectively have upper grooves buckled on the support platform body 31. When the front part of the support platform 13 is installed between the left and right sides of the front support legs 11, the left and right side parts of the front part of the support platform 13 are respectively buckled on the support platform body, and the two support platform bodies are respectively located in the upper grooves.

[0052] The left and right sides of the front part of the support platform 13 are respectively provided with sliding spring pins, and spring pin locking holes are respectively opened on the mounting brackets on both sides. When the front part of the support platform 13 is installed between the left and right sides of the front support legs 11, the spring pins are inserted into the corresponding spring pin locking holes. The front part of the support platform 13 is also provided with a lower knob for sliding back and forth, and a traction rope is provided between the lower knob and the spring pins on both sides. By pressing the lower knob, the spring pins on both sides can be dragged inward, thereby disengaging from the spring pin locking holes, and the support platform 13 can be lifted up, the front support legs and the rear support legs are brought together front and back, the chair frame is folded, and then the seat 100 is detached, the angle adjustment mechanism between the front frame and the rear frame is unlocked, the front frame is rotated downward and folded, and the entire children's chair is folded.

[0053] In this embodiment, the front support legs and the rear support legs are respectively positioned by upper and lower plug-in and pull-out spring pins. When packing and transporting, they can be disassembled to further reduce the volume. The two sides of the ladder pedal 14 have sleeves, which are respectively sleeved on the corresponding pipe fittings of the corresponding front support legs, and can be fixed and disassembled by screws.

[0054] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A children's chair, comprising a chair frame, characterized in that: The chair frame comprises a chair frame body (1) and a surrounding frame (2) arranged on the chair frame body (1); the surrounding frame (2) is capable of being adjusted in angle and is locked in at least a first working position by an angle adjustment mechanism, so as to allow a detachable connection between the seat (100) and the surrounding frame (2).

2. A children's chair according to claim 1, characterized in that: When the surrounding frame (2) is in the first working position, at least the front portion of the surrounding frame (2) is tilted forward and downward, allowing the front portion of the bottom of the seat (100) to be detachably connected to the front portion of the surrounding frame (2), and / or the left and right side portions of the seat (100) to be detachably connected to the left and right side portions of the surrounding frame (2), and / or the rear portion of the seat (100) to be detachably connected to the rear portion of the surrounding frame (2).

3. A children's chair according to claim 1, characterized in that: The bottom of the seat (100) comprises a seat slot (101a) with an opening facing forward or arranged facing forward and downward, and a seat stopper (101b) located below the seat slot (101a); when the seat (100) is in a connected state with the surrounding frame (2), a front cross bar (21a) at the front of the surrounding frame (2) is inserted into the seat slot (101a), and the seat stopper (101b) abuts against the bottom side of the front cross bar (21a).

4. A children's chair according to claim 1, characterized in that: The rear part of the seat (100) is detachably connected to the rear part of the surrounding frame (2) via a rear locking mechanism (30). The rear locking mechanism (30) comprises a locking hook (31) pivotally mounted on the rear part of the seat back (102) via a locking hook shaft (36). The lower part of the locking hook (31) comprises a hook groove (31a), a hook body (31b) located at the lower part of the hook groove (31a), and a pushing part (31c) located at the upper opening of the hook groove (31a). The locking hook elastic member is arranged between the locking hook (31) and the backrest (102) to make the hook body (31b) bounce back to a released position. When the rear locking mechanism (30) is locked, the rear cross bar (21c) at the rear of the surrounding frame (2) is locked. 2a) touches the pushing portion (31c) to cause the lock hook (31) to rotate against the elastic force of the lock hook elastic member until the hook body (31b) hooks the frame rear cross bar (22a) and is in a locked position, one of the frame rear cross bar (22a) and the hook body (31b) having a convex portion, and the other having a concave portion, and the convex portion and the concave portion are plugged into each other in the locked position, and the rear lock mechanism (30) further comprises an unlocking handle (32) movably arranged on the backrest (102), and a first elastic body (34a) for applying force to the unlocking handle (32) so that it is stably engaged with the lock hook (31) to prevent the hook body (31b) from springing back to release the frame rear cross bar (22a).

5. A children's chair according to claim 4, characterized in that: The rear lock mechanism (30) further comprises a second lock button (33) movably arranged on the top of the backrest (102), a second elastic body (34c), a sliding member (34b), and the first elastic body (34a) which are sequentially arranged between the second lock button (33) and the unlocking handle (32), a second lock (35) movably arranged on the backrest (102), and a second lock elastic member arranged between the second lock (35) and the backrest (102) for applying force to the second lock (35) so that it is snap-fitted with the sliding member (34b) and cannot move. The second lock button (33) and the second lock (35) are slidably matched via an inclined surface. When the second lock button (33) is pressed, the second lock (35) is driven to slide and thus disengage from the sliding member (34b).

6. The child chair according to claim 1, characterized in that: The enclosure frame (2) comprises a front enclosure frame (21) and a rear enclosure frame (22); the rear enclosure frame (22) is fixed to the chair frame body (1); two end portions of the front enclosure frame (21) are respectively pivotally connected to corresponding portions of the rear enclosure frame (22) and locked via an angle adjustment mechanism, so that the front enclosure frame (21) has at least a first working position tilted in a forward and downward direction.

7. A children's chair according to claim 6, characterized in that: The rear enclosure frame (22) comprises a rear frame cross bar (22a), a enclosure support rod (22b) formed by respectively extending downward from two end portions of the rear frame cross bar (22a), and two angle adjustment seats (22c) respectively located on the left and right sides and fixed on the corresponding enclosure support rod (22b) and / or the rear frame cross bar (22a), and the two end portions of the front enclosure frame (21) are respectively pivotally connected to the corresponding angle adjustment seats (22c) and locked by the angle adjustment mechanism.

8. A children's chair according to any one of claims 2 to 7, characterized in that: The surrounding frame (2) also has a second working position relative to the chair frame body (1), in which the front part of the surrounding frame (2) is extended forward.

9. A children's chair according to claim 8, characterized in that: The chair frame body (1) further comprises a support platform (13) which can be folded or disassembled, wherein the support platform (13) is located below the surrounding frame (2); when the surrounding frame (2) is in the second working position, the support platform (13) forms a standing platform for a child to stand on, and the surrounding frame (2) constitutes a device for protecting the child's waist.

10. A children's chair according to claim 9, characterized in that: The chair frame body (1) further comprises: A front supporting leg (11), the left and right upper ends of the front supporting leg (11) being respectively connected to the frame support rods (22b) on the left and right sides of the frame (2); a rear supporting leg (12), wherein two upper ends of the rear supporting leg (12) are respectively pivotally connected to the front supporting leg (11), and the supporting platform (13) is installed between the front supporting leg (11) and the rear supporting leg (12). One of the front side and the rear side of the support platform (13) is detachably connected to the corresponding support leg through a platform locking mechanism, and the other is pivotally connected to the corresponding support leg. At least one ladder pedal (14) is fixedly connected, foldably connected or detachably connected to the front supporting leg (11) and / or the rear supporting leg (12), and at least one ladder pedal (14) is located below the side of the supporting platform (13).

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