New folding ladder

Abstract

New folding ladder, which includes: a folding plate (1) and two bars (2), wherein a plurality of rungs (3) are evenly and firmly connected between the two bars (2), wherein a sliding groove (4) is provided on each side surface of the hollow (2), wherein a slide (5) is slidably arranged in the sliding groove (4), wherein the folding plate (1) is rotatably connected to the slides (5) on the two sides; a support mechanism (6) comprising two rotating rods (7) which are rotatably connected to the underside of the folding plate (1), the rotating rods (7) each being slidably covered by a sheathing tube (8), the slider (5) being provided with a connecting element (9) for connection to the sheathing tube (8), the support mechanism (6) also comprising a weight block (14) which is slidably connected to the upper side of the folding plate (1), wherein return springs (15) are provided on both sides of the weight block (14) and are firmly connected to the folding plate (1), wherein a plug-in space (16) is provided in the middle of the weight block (14), wherein the folding plate (1) is connected to first tension springs (17), wherein a handle (18) is firmly connected to the upper ends of the first tension springs (17), wherein the handle (18) slidably rests against the inner wall of the plug-in space (16), wherein the rotating rods (7) are each provided with a limiting element (19), to limit the sheath tubes (8) when the handle (18) is inserted into the plug-in space (16); a control mechanism (10) comprising a plurality of control blocks (11) mounted on the sliders (5), the sliding grooves (4) each being evenly provided with a plurality of triangular recesses (12) into which the control blocks (11) can engage, the control mechanism (10) serving to automatically control the contact strength between the control blocks (11) and the triangular recesses (12) in accordance with the angle of rotation of the folding plate (1) so as to ensure that the resistance to the sliding down of the sliders (5) is greater when the angle between the uprights (2) and the wall is smaller; and a fastening mechanism (13) attached to the uprights (2) and serving to fix the sliders (5) in the upper position and to control the sliding down state of the folding plate (1).

Description

Field of the invention

[0001] The invention relates to the technical field of rescue ladders, in particular a novel folding ladder. State of the art

[0002] In an emergency, the execution of rescue operations is very important. Rescue work requires long-term and comprehensive preparation, and rescue operations can be carried out at any time and in a timely manner. There are many rescue equipment available for major accidents, such as fire engines and aerial vehicles. When emergencies occur on lower floors or in narrow alleys, rescuers often use folding ladders to rescue trapped people. The folding ladder is small and lightweight. After folding, it is flat and can be flexibly set up in narrow spaces, which greatly increases the efficiency of rescue.

[0003] The existing folding ladder has a relatively simple function and can generally only assist rescuers in ascending and descending. For some elderly people and young children who are trapped, it is relatively difficult to descend from the ladder. In the process, rescuers must carry them on their backs and climb down from the ladder, which makes the work more difficult for rescuers and consumes a lot of physical effort. At the same time, the danger in the rescue process also greatly increases. Although some existing ladders can assist in transportation, most of them are powered by motors. For practical reasons, batteries must be used, which greatly increases the cost and weight of the ladder and makes the rescue and transportation process inconvenient. For this purpose, the invention provides a novel folding ladder. Object of the invention

[0004] The object of the invention is to provide a folding ladder to improve the efficiency and comfort of rescue transports and thus solve the problems in the prior art.

[0005] To achieve the above object, the invention provides the following solution: A folding ladder comprising a folding plate, a support mechanism, a control mechanism, a fastening mechanism, and two stiles, wherein a plurality of rungs are evenly and firmly connected between the two stiles, wherein a sliding groove is provided on the side surfaces of each hollow, wherein a slider is slidably arranged in the sliding groove, wherein the folding plate is rotatably connected to the sliders on both sides, wherein the support mechanism includes two rotating rods that are rotatably connected to the underside of the folding plate, wherein the rotating rods are each slidably covered with a sheath, wherein the slider is provided with a connecting element for connection to the sheath, wherein the support mechanism serves to automatically control the folding plate so that it is fixed in a horizontal state when the folding plate is unfolded,wherein the pivot rods and the sheathing tubes are automatically limited according to the angle of inclination of the stiles, so that stable support of the folding plate is achieved, wherein the control mechanism includes a plurality of control blocks mounted on the sliders, wherein the sliding grooves are each evenly provided with a plurality of triangular recesses into which the control blocks can engage, wherein the control mechanism serves to automatically control the contact strength between the control blocks and the triangular recesses according to the angle of rotation of the folding plate, so as to ensure that the resistance to the sliding down of the sliders is greater when the angle between the stiles and the wall is smaller, and wherein the fixing mechanism is attached to the stiles and serves to fix the sliders in the upper position and to control the sliding down state of the folding plate,to increase the efficiency and comfort of rescue transport.

[0006] Preferably, the support mechanism also includes a weight block slidably connected to the top of the folding plate, wherein return springs are provided on both sides of the weight block and are fixedly connected to the folding plate, wherein a plug-in space is provided in the center of the weight block, wherein the folding plate is connected to first tension springs, wherein a handle is fixedly connected to the upper ends of the first tension springs, wherein the handle slidably abuts the inner wall of the plug-in space, wherein the rotating rods are each provided with a limiting element for limiting the sheathing tubes when the handle is inserted into the plug-in space to automatically control the folding plate to be fixed in a horizontal state when the folding plate is unfolded, wherein according to the inclination angle of the uprights, the rotating rods and the sheathing tubes are automatically limited so that the stable support of the folding plate is achieved.

[0007] Preferably, the restriction member comprises a first pull cord disposed in the folding plate, the middle part of the first pull cord being fixedly connected to the underside of the handle, and the two ends of the first pull cord penetrating the rotating rods on the two sides and slidably abutting the inner wall of the rotating rods, wherein a plurality of helical tooth sections are provided in the sheath tube, wherein first helical tooth blocks engageable with the first helical tooth sections are slidably disposed in the rotating rod, one end of the first helical tooth block being fixedly connected to a first spring fixedly connected to the rotating rod, wherein the two ends of the first pull cord are fixedly connected to the first helical tooth blocks on the two sides, thereby restricting the sheath tubes when the handle is inserted into the plug-in space.

[0008] Preferably, the control mechanism further includes second springs fixedly arranged on the sides of the control blocks, the end of the second spring facing away from the control block being fixedly connected to a first trapezoidal block, the control block and the first trapezoidal block both slidably abutting the inner wall of the slider, a plurality of second trapezoidal blocks being slidably provided in the slider, the inclined surface of the first trapezoidal block slidably abutting the inclined surface of the second trapezoidal block, a control element being provided in the slider for adjusting the sliding position of the second trapezoidal blocks in accordance with the angle of rotation of the folding plate, whereby the contact strength between the control blocks and the triangular recesses is automatically controlled in accordance with the angle of rotation of the folding plate and thereby ensuring that the sliding resistance of the sliders is greater when the angle between the stiles and the wall is smaller.

[0009] Preferably, the control element comprises a connecting rod slidably abutting the inner wall of the slider, wherein a plurality of second trapezoidal blocks are fixedly connected to the connecting rod, wherein a sliding rod is fixedly connected to one side of the connecting rod, wherein a connecting tube is fixedly connected in the slider, wherein the outer wall of the sliding rod slidably abuts the inner wall of the connecting tube, wherein one end of the rotating rod is fixedly connected to a second tension spring which is fixedly connected to the cladding tube, wherein the connecting element is used to connect the cladding tube to the connecting tube, whereby the positions of the second trapezoidal blocks can be adjusted according to the angle of rotation of the folding plate.

[0010] Preferably, the connecting element comprises a joint part which is fixedly arranged at one end of the slide, wherein the joint part is rotatably connected to a ring which is connected to one end of the cladding tube, wherein a communication tube is provided in the joint part which is connected to the connecting tube, wherein a plurality of branch tubes are provided in the joint part which communicate with the inner wall of the ring, and wherein the branch tubes are connected at one end to the communication tube, whereby the cladding tube is communicated with the connecting tube.

[0011] Preferably, the fixing mechanism includes a second pull cord disposed between the two uprights, a second helical tooth block provided in the upright, the slider having a second helical tooth portion on one side engageable with the second helical tooth block, a third spring fixedly connected to the upright is fixedly connected to one side of the second helical tooth block, the two ends of the second pull cord being connected to the second helical tooth blocks on the two sides, thereby fixing the sliders in the upper positions and controlling the sliding-down state of the folding plate.

[0012] At the end of the sliding groove, a buffer spring is firmly connected, which buffers the folding plate when it reaches the lower position.

[0013] A step groove is provided on the folding plate, which makes it easier for the rescuer to step.

[0014] Compared with the prior art, the invention has the following advantages: The invention solves the problem that it is difficult to assist trapped people during transport and rescue from the danger zone with the existing folding ladder. Due to the arrangement of the support mechanism, the control mechanism, and the fixing mechanism, the folding plate and the stiles are in a close-fitting state when stored, which is convenient for rescue operations in confined spaces. After the inclined erection, the rescuers climb through the rungs to the desired position and rotate the folding plate. The folding plate is automatically controlled by the support mechanism and fixed in a horizontal state. According to the inclination angle of the stiles, the rotating rods and the sheathing tubes are automatically limited, thus achieving stable support of the folding plate. The trapped people can be placed on top of the folding plate for automatic transport.The control mechanism can automatically control the contact strength between the control blocks and the triangular recesses according to the rotation angle of the folding plate, thus ensuring that the resistance to the sliding down of the sliders is greater when the angle between the stiles and the wall is smaller, that is, the greater the slope, the greater the resistance, to prevent rapid sliding down and thus avoid safety hazards. After the trapped person is placed on top of the folding plate, the fixation of the sliders can be released by the fastening mechanism. The sliders will automatically slide down along the sliding grooves under gravity, thereby achieving the rescue and transportation task. The device is small and lightweight, easy to operate, and greatly increases rescue efficiency. Short description of the drawings Fig. 1 a representation of the folded state of the invention, Fig. 2 a representation of the unfolded state of the invention, Fig. 3 a representation of the support mechanism of the invention, Fig. 4 a representation of the fastening mechanism of the invention, Fig. 5 an enlarged view of zone A in Fig. 4, Fig. 6 a representation of the control mechanism of the invention, Fig. 7 an enlarged view of zone B in Fig. 6, Fig. 8 an enlarged view of zone C in Fig. 6, Fig. 9 is a partially exploded view of the control mechanism of the invention, Fig. 10an enlarged view of Zone D in Fig. 9, Fig. 11 a representation of the weight block of the invention, Fig. 12 a partial view of the limiting element of the invention.

[0015] Reference numerals: 1 folding plate, 2 stile, 3 rung, 4 sliding groove, 5 slider, 6 support mechanism, 7 rotating rod, 8 sheath tube, 9 connecting element, 10 control mechanism, 11 control block, 12 triangular recess, 13 fastening mechanism, 14 weight block, 15 return spring, 16 plug-in space, 17 first tension spring, 18 handle, 19 limiting element, 20 first pull cord, 21 first helical tooth section, 22 first helical tooth block, 23 first spring, 24 second spring, 25 first trapezoid block, 26 second trapezoid block, 27 connecting rod, 28 sliding rod, 29 connecting tube, 30 second tension spring, 31 joint part, 32 ring, 33 communication tube, 34 branch tube, 35 second pull cord, 36 second helical tooth block, 37 second helical tooth section, 38 third Spring, 39 Buffer spring, 40 Tread groove, 41 Control element Description of the preferred embodiments

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention and not all embodiments. Based on the embodiments of the present invention, all other embodiments that can be achieved by ordinary technicians in this field without any creative work are intended to fall within the scope of the present invention. Embodiment 1

[0017] Fig. 1 to 8 show the novel folding ladder of the invention, which comprises a folding plate 1, a support mechanism 6, a control mechanism 10, a fastening mechanism 13, and two stiles 2. A plurality of rungs 3 are evenly and firmly connected between the two stiles 2. A sliding groove 4 is provided on each side surface of the hollow 2. A slider 5 is slidably arranged in the sliding groove 4. The folding plate 1 is rotatably connected to the sliders 5 on both sides. A buffer spring 39 is firmly connected to the end of the sliding groove 4. A tread groove 40 is provided on the folding plate 1. The support mechanism 6 includes two pivot rods 7, which are rotatably connected to the underside of the folding plate 1. The pivot rods 7 are each slidably covered by a sheath 8. The slider 5 is provided with a connecting element 9 for connection to the sheath 8.The support mechanism 6 serves to automatically control the folding plate 1 so that it is fixed in a horizontal state when the folding plate 1 is unfolded. According to the inclination angle of the stiles 2, the rotating rods 7 and the sheathing tubes 8 are automatically limited, so that the stable support of the folding plate 1 is achieved. The control mechanism 10 includes a plurality of control blocks 11 mounted on the sliders 5. The sliding grooves 4 are each evenly provided with a plurality of triangular recesses 12 into which the control blocks 11 can engage. The control mechanism 10 serves to automatically control the contact strength between the control blocks 11 and the triangular recesses 12 according to the rotation angle of the folding plate 1, thus ensuring that the resistance to the sliding down of the sliders 5 is greater when the angle between the stiles 2 and the wall is smaller.The fastening mechanism 13 is attached to the bars 2 and serves to fix the sliders 5 in the upper position and to control the sliding down state of the folding plate 1.

[0018] Referring to Fig. 2 to 11, the support mechanism 6 also includes a weight block 14 slidably connected to the top of the folding plate 1. Return springs 15 are provided on both sides of the weight block 14 and are fixedly connected to the folding plate 1. A plug-in space 16 is provided in the center of the weight block 14. The folding plate 1 is connected to first tension springs 17. A handle 18 is fixedly connected to the upper ends of the first tension springs 17. The handle 18 slidably abuts the inner wall of the plug-in space 16. The pivot rods 7 are each provided with a limiting element 19 to limit the sheath tubes 8 when the handle 18 is inserted into the plug-in space 16.

[0019] As in Fig. 6 to 12, the limiting member 19 has a first pull cord 20 arranged in the folding plate 1. The middle part of the first pull cord 20 is fixedly connected to the bottom of the handle 18, and the two ends of the first pull cord 20 penetrate the rotating rods 7 on the two sides and slidably rest against the inner wall of the rotating rods 7. A plurality of helical tooth portions 21 are provided in the casing 8. First helical tooth blocks 22, which can engage with the first helical tooth portions 21, are slidably arranged in the rotating rod 7. One end of the first helical tooth block 22 is fixedly connected to a first spring 23, which is fixedly connected to the rotating rod 7. The two ends of the first pull cord 20 are fixedly connected to the first helical tooth blocks 22 on the two sides.

[0020] In this embodiment, the stiles 2 are erected at an angle on the outside of the wall. The rescuer climbs to the desired position using the rungs 3 and pulls the handle 18 to rotate the folding plate 1. The handle 18 pulls the first pull cord 20. The first pull cord 20 pulls the first oblique tooth blocks 22 on both sides, compressing the first springs 23, thus releasing the blockage by the first oblique tooth blocks 22. The folding plate 1 is then rotated upward, and the handle 18 slides out of the slot 16. Under the influence of gravity, the weight block 14 slides to the downward-sloping side. After that, the handle 18 is released and can no longer be inserted into the slot 16.When the folding plate 1 is rotated to the horizontal state, the weight block 14 is in a stable position under the pressure of the return springs 15, and the handle 18 is pulled by the first tension springs 17 and inserted into the plug-in space 16. The first springs 23 return and press the first helical tooth blocks 22 into the first helical tooth portions 21, thereby limiting the positions of the rotating rods 7 and the sheath tubes 8, so that the folding plate 1 is fixed. After that, the trapped people can be placed on top of the folding plate 1 for transport. After that, the limitation is released by the fastening mechanism 13, and the sliders 5 and the folding plate 1 can slide down along the sliding grooves 4 to the lower ends of the spars 2 by gravity, thus completing the rescue transport.

[0021] It should be noted that the control mechanism 10 can automatically control the contact strength between the control blocks 11 and the triangular recesses 12 according to the rotation angle of the folding plate 1. This ensures that the smaller the angle between the uprights 2 and the wall, the greater the sliding resistance of the sliders 5, that is, the greater the slope, the greater the resistance, preventing rapid sliding down and thus avoiding safety hazards. The device is compact and easy to operate. The downward transport of trapped people can be completed without the use of a motor drive. At the same time, the transport speed is relatively stable.A pull cord may be provided on the upper side of the folding plate 1 or the slider 5 to pull the folding plate back to the top of the stiles 2 so that transportation can be carried out again, thereby greatly increasing rescue efficiency. After use, the handle 18 is pulled to release the restriction by the first helical tooth blocks 22 and the first helical tooth sections 21. The folding plate 1 is rotated toward the stiles 2, and then the handle 18 is released, thereby completing the folding. In the storage state, the folding plate 1 rests against the stiles 2, thus facilitating rescue operations in narrow spaces. Embodiment 2

[0022] Fig. 4 to 10 show embodiment 2, and embodiment 1 is explained in more detail. The control mechanism 10 shown in the figure also includes second springs 24, which are fixedly arranged on the sides of the control blocks 11. The end of the second spring 24 facing away from the control block 11 is fixedly connected to a first trapezoidal block 25. The control block 11 and the first trapezoidal block 25 both lie slidably on the inner wall of the slider 5. A plurality of second trapezoidal blocks 26 are slidably provided in the slider 5. The inclined surface of the first trapezoidal block 25 lies slidably on the inclined surface of the second trapezoidal block 26. A control element 41 for adjusting the sliding position of the second trapezoidal blocks 26 according to the rotation angle of the folding plate 1 is provided in the slider 5.

[0023] As in Fig. 6 to 10, the control element 41 in the figure has a connecting rod 27 that slidably rests on the inner wall of the slider 5. A plurality of second trapezoidal blocks 26 are fixedly connected to the connecting rod 27. A slide rod 28 is attached to one side of the connecting rod 27. A connecting tube 29 is fixedly connected in the slider 5. The outer wall of the slide rod 28 slidably rests on the inner wall of the connecting tube 29. One end of the rotating rod 7 is fixedly connected to a second tension spring 30, which is fixedly connected to the cladding tube 8. A connecting element 9 is used to connect the cladding tube 8 to the connecting tube 29.

[0024] As in Fig. As shown in Figures 6 to 10, the connecting element 9 in the figure has a joint part 31 fixedly arranged at one end of the slide 5. The joint part 31 is rotatably connected to a ring 32, which is connected to one end of the cladding tube 8. A communication tube 33 is provided in the joint part 31 and is connected to the connecting tube 29. A plurality of branch tubes 34 are provided in the joint part 31 and communicate with the inner wall of the ring 32. The branch tubes 34 are connected to the communication tube 33 at one end.

[0025] In the present embodiment, the rotating rod 7, the sheath tube 8, and the ring 32 are driven to rotate around the hinge part 31 when the folding plate 1 is rotated. The branch tubes 34 always keep the communication tube 33 and the ring 32 in a communicated state. When the rotating rod 7 slides in the sheath tube 8, the air in the connecting tube 29 can be exhausted through the communicating tube 33. The pressure in the connecting tube 29 is reduced, causing the sliding rod 28 to slide in the connecting tube 29, so that the connecting rod 27 and the second keystone blocks 26 are driven to slide. The inclined surfaces of the second keystone blocks 26 press against the inclined surfaces of the first keystone blocks 25, thereby compressing the second springs 24. The control blocks 11 are pressed into the triangular recesses 12.The greater the extended length of the pivot rods 7, the greater the tensile length of the second trapezoidal blocks 26, and the higher the compressive force on the control blocks 11, the higher the resistance with the triangular recesses 12. Therefore, when the angle between the stiles 2 and the wall is smaller, the resistance for the folding plate 1 is greater to prevent rapid sliding down and thus avoid safety risks. Conversely, when the angle is larger, the resistance is reduced to increase the sliding down speed. Embodiment 3

[0026] Fig.2 to 8 show embodiment 3, and embodiment 1 is explained in more detail. The fastening mechanism 13 shown in the figure includes a second pull cord 35 arranged between the two bars 2. A second helical tooth block 36 is provided in the bar 2. The slider 5 has a second helical tooth portion 37 on one side, which can engage with the second helical tooth block 36. A third spring 38, which is fixedly connected to the bar 2, is fixedly connected to one side of the second helical tooth block 36. The two ends of the second pull cord 35 are connected to the second helical tooth blocks 36 on the two sides.

[0027] In this embodiment, when the slider 5 slides upward and reaches the upper end of the sliding groove 4, the second helical tooth block 36 engages with the second helical tooth portion 37, thereby limiting the position of the slider 5, so that the folding plate 1 and the sliders 5 are prevented from sliding directly downward when the trapped person sits on the folding plate 1. When the person sits on the folding plate 1, the second pull cord 35 is pulled to move the second helical tooth blocks 36 on the both sides and simultaneously compress the third springs 38, thereby releasing the fixation by the second helical tooth portions 37. After that, the sliders 5 slide downward together with the folding plate 1 to complete the transportation and rescue operation.

[0028] It should be noted that in this specification, terms such as "first" and "second," etc., are used merely to distinguish one entity or operation from another and do not necessarily require or imply any actual relationship or sequence between those entities or operations. Furthermore, the terms "comprising," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device that includes a list of elements includes not only those elements, but also other elements not expressly listed, or also includes elements inherent in such a process, method, article, or device.

[0029] Although embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

[1] New folding ladder, which includes: a folding plate (1) and two bars (2), wherein a plurality of rungs (3) are evenly and firmly connected between the two bars (2), wherein a sliding groove (4) is provided on each side surface of the hollow (2), wherein a slide (5) is slidably arranged in the sliding groove (4), wherein the folding plate (1) is rotatably connected to the slides (5) on the two sides; a support mechanism (6) comprising two rotating rods (7) which are rotatably connected to the underside of the folding plate (1), the rotating rods (7) each being slidably covered by a sheathing tube (8), the slider (5) being provided with a connecting element (9) for connection to the sheathing tube (8), the support mechanism (6) also comprising a weight block (14) which is slidably connected to the upper side of the folding plate (1), wherein return springs (15) are provided on both sides of the weight block (14) and are firmly connected to the folding plate (1), wherein a plug-in space (16) is provided in the middle of the weight block (14), wherein the folding plate (1) is connected to first tension springs (17), wherein a handle (18) is firmly connected to the upper ends of the first tension springs (17), wherein the handle (18) slidably rests against the inner wall of the plug-in space (16), wherein the rotating rods (7) are each provided with a limiting element (19), to limit the sheath tubes (8) when the handle (18) is inserted into the plug-in space (16); a control mechanism (10) comprising a plurality of control blocks (11) mounted on the sliders (5), the sliding grooves (4) each being evenly provided with a plurality of triangular recesses (12) into which the control blocks (11) can engage, the control mechanism (10) serving to automatically control the contact strength between the control blocks (11) and the triangular recesses (12) in accordance with the angle of rotation of the folding plate (1) so as to ensure that the resistance to the sliding down of the sliders (5) is greater when the angle between the uprights (2) and the wall is smaller; and a fastening mechanism (13) attached to the uprights (2) and serving to fix the sliders (5) in the upper position and to control the sliding down state of the folding plate (1). [2] Novel folding ladder according to claim 1, characterized byin that the limiting element (19) has a first pull cord (20) which is arranged in the folding plate (1), wherein the middle part of the first pull cord (20) is firmly connected to the underside of the handle (18) and the two ends of the first pull cord (20) penetrate the rotating rods (7) on the two sides and slidably rest on the inner wall of the rotating rods (7), wherein a plurality of helical tooth sections (21) are provided in the casing tube (8), wherein first helical tooth blocks (22) which can engage in the first helical tooth sections (21) are slidably arranged in the rotating rod (7), wherein one end of the first helical tooth block (22) is firmly connected to a first spring (23) which is firmly connected to the rotating rod (7), wherein the two ends of the first pull cord (20) are firmly connected to the first helical tooth blocks (22) on the two sides. [3] Novel folding ladder according to claim 1, characterized byin that the control mechanism (10) also includes second springs (24) which are fixedly arranged on the sides of the control blocks (11), wherein the end of the second spring (24) facing away from the control block (11) is fixedly connected to a first trapezoidal block (25), wherein the control block (11) and the first trapezoidal block (25) both bear slidably against the inner wall of the slide (5), wherein a plurality of second trapezoidal blocks (26) are provided slidably in the slide (5), wherein the inclined surface of the first trapezoidal block (25) bears slidably against the inclined surface of the second trapezoidal block (26), wherein a control element (41) for adjusting the sliding position of the second trapezoidal blocks (26) in accordance with the angle of rotation of the folding plate (1) is provided in the slide (5). [4] Novel folding ladder according to claim 3, characterized byin that the control element (41) has a connecting rod (27) which bears slidably against the inner wall of the slide (5), wherein a plurality of second trapezoidal blocks (26) are firmly connected to the connecting rod (27), wherein a sliding rod (28) is fastened to one side of the connecting rod (27), wherein a connecting tube (29) is firmly connected in the slide (5), wherein the outer wall of the sliding rod (28) bears slidably against the inner wall of the connecting tube (29), wherein one end of the rotating rod (7) is firmly connected to a second tension spring (30) which is firmly connected to the cladding tube (8), and wherein the connecting element (9) is used to connect the cladding tube (8) to the connecting tube (29). [5] Novel folding ladder according to claim 4, characterized byin that the connecting element (9) has a joint part (31) which is fixedly arranged at one end of the slide (5), wherein the joint part (31) is rotatably connected to a ring (32) which is connected to one end of the cladding tube (8), wherein a communication tube (33) is provided in the joint part (31) and is connected to the connecting tube (29), wherein a plurality of branch tubes (34) are provided in the joint part (31) which communicate with the inner wall of the ring (32), and wherein the branch tubes (34) are connected at one end to the communication tube (33). [6] Novel folding ladder according to claim 1, characterized byin that the fastening mechanism (13) includes a second pull cord (35) arranged between the two bars (2), a second helical tooth block (36) being provided in the bar (2), the slider (5) having a second helical tooth portion (37) on one side which can engage with the second helical tooth block (36), a third spring (38) which is fixedly connected to the bar (2) being fixedly connected to one side of the second helical tooth block (36), the two ends of the second pull cord (35) being connected to the second helical tooth blocks (36) on the two sides. [7] Novel folding ladder according to claim 1, characterized by that a buffer spring (39) is firmly connected to the end of the sliding groove (4). [8] Novel folding ladder according to claim 1, characterized by that a step groove (40) is provided on the folding plate (1).

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