Folding step for ladders

Abstract

The application provides a folding step for a ladder, which comprises a fixing part, a tread part and a folding mechanism. The folding mechanism is a diagonal support type link support, which comprises an upper support arm and a lower support arm. One end of the upper support arm is slidably connected with the tread part, and the other end of the upper support arm is rotatably connected with the lower support arm. One end of the lower support arm is rotatably connected with the tread part. The fixing part comprises a first fixing part and a second fixing part. The first fixing part is rotatably connected with the end of the lower support arm away from the tread part, and is detachably connected with a stand column of the ladder. The second fixing part is arranged on the tread part and is detachably connected with a tread bar of the ladder. The first fixing part is slidably connected with the stand column of the ladder, and the second fixing part is rotatably connected with the tread bar of the ladder. Through the sliding and rotating connection of the diagonal support type link support, the folding and storage of the tread part are realized, and the structure is simple and reliable, and the operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of ladder climbing equipment technology, and in particular to a folding step for ladder climbing. Background Technology

[0002] The actual working conditions on site are diverse, and many narrow spaces present difficulties for passage and construction. The only option is to cut the round pipes of the coupler-type steel pipe scaffolding into shorter lengths before transporting them into the narrow spaces for scaffolding erection. This not only wastes materials but also further shrinks the construction area in the narrow spaces due to the erection of the coupler-type steel pipe scaffolding. This further increases safety hazards and construction difficulty for construction workers when moving up and down and during construction.

[0003] To maximize safety in confined spaces and reduce construction difficulty, scaffolding ladders are directly fixed in these spaces as tools for moving up and down and for standing during construction. However, construction techniques and safety management regulations stipulate that ladders can only be used as passageways and that it is forbidden to stand on ladders for extended periods or to remove one's hands from the ladders during production or construction. This method poses a risk of falling from heights. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the existing auxiliary step for climbing ladders, such as complex structure, inconvenient installation, space occupation when not in use, and low safety, and to provide a folding step for climbing ladders.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A folding step for a ladder includes a fixing part, a step surface and a folding mechanism. The folding mechanism is a diagonal bracing linkage bracket, which includes an upper support arm and a lower support arm. One end of the upper support arm is slidably connected to the step surface, and the other end of the upper support arm is rotatably connected to the lower support arm. One end of the lower support arm is rotatably connected to the step surface.

[0007] The fixing part includes a first fixing member and a second fixing member. The first fixing member is rotatably connected to the end of the lower support arm away from the tread surface and is detachably connected to the upright of the ladder. The second fixing member is disposed on the tread surface and is detachably connected to the step bar of the ladder.

[0008] The first fixing member is slidably connected to the upright of the ladder, and the second fixing member is rotatably connected to the step bar of the ladder.

[0009] In this design, the first fixing component connects to the ladder column, and the second fixing component connects to the ladder rungs, achieving two-point stable fixation of the folding treads on the ladder. This ensures the treads can support the weight of workers during use, maintaining stability and reliability. Simultaneously, the first fixing component slides up and down on the column, coordinating with the rotation of the second fixing component on the rungs and the lever effect of the lower support arm. Simply dragging the first fixing component along the column causes the entire tread surface to rise, fall, and rotate. This linkage design allows users to quickly adjust the height and position of the treads with simple pushes and pulls. Furthermore, the second fixing component is rotatably connected to the ladder rungs. When the ladder is tilted against a wall, this rotating joint allows the treads to automatically remain level, preventing them from tilting with the ladder's inclination. This significantly improves worker comfort and safety when working or stepping on the treads. The diagonal bracing linkage bracket, through the sliding connection between the upper arm and the tread surface and the rotating connection between the upper and lower arms, allows the tread surface to flexibly switch between different support angles. The diagonal bracing linkage bracket forms a robust triangular mechanical support structure with the upper arm slidingly connecting to the tread surface and the lower arm. This diagonal bracing design efficiently converts the working load into compressive stress transmitted along the linkage axis, and stably transmits the force to the main frame of the ladder through the sliding limit end and the rotating connection end. This ensures absolute stability under heavy loads, significantly improving safety and reliability. When folded, the upper arm slides and retracts along the tread surface, keeping the entire tread close to the side of the ladder without occupying extra space.

[0010] Preferably, the first fixing member and the second fixing member are double-bolt pipe clamps. The double-bolt pipe clamp includes two pipe sleeves that are correspondingly arranged and two bolts arranged on both sides of the pipe sleeve in the width direction. The pipe sleeve is provided with bolt holes, and the bolts pass through the bolt holes and connect the two pipe sleeves.

[0011] In this design, symmetrically arranged double-bolt pipe clamps serve as fixing components. This structure applies uniform force to the ladder columns or steps from both sides, effectively preventing deflection and loosening caused by unilateral clamping, and significantly enhancing the frictional anti-slip force of the contact surfaces, thus ensuring the long-term reliability of the connection. Simultaneously, because the locking forces on both sides are always in a state of internal force balance, it effectively prevents jamming defects such as thread seizing and stress deformation. Simply loosening the nuts on both sides simultaneously allows for smooth release and separation of the clamp without residual stress. Furthermore, the two pipe sleeves are connected by bolts, and the distance between the two pipe sleeves can be adjusted using the bolts. This allows for rotational or sliding adjustments between the first and second fixing components and the ladder, which can be accomplished simply by adjusting the screw-in length of the bolts, making operation convenient, safe, and reliable. Therefore, this pipe clamp, while ensuring high fastening strength, also considers the high efficiency of repeated disassembly and assembly and the accuracy of repeated assembly, significantly improving the convenience of later maintenance and repair of on-site equipment.

[0012] Preferably, the axial direction of the second fixing member is consistent with the axial direction of the ladder's rungs.

[0013] In this solution, by setting the axial direction of the second fixing member to be consistent with the axial direction of the pedal, the second fixing member can be completely aligned with the extension direction of the pedal during installation. This ensures the maximum contact area and optimal stress angle between the second fixing member and the pedal, avoids additional bending moment and stress concentration caused by axial misalignment, and improves connection strength and service life.

[0014] Preferably, the first fixing member and the lower support arm are connected by bolts, and the extension direction of the bolts is perpendicular to the extension axis of the first fixing member.

[0015] In this design, the first fixing member and the lower support arm are connected by bolts. The bolts not only serve as connectors to secure the lower support arm to the first fixing member, but also as rotatable components, allowing the first fixing member to rotate freely relative to the lower support arm. This, combined with the sliding mechanism of the first fixing member on the ladder's uprights, enables the installation, removal, and angle adjustment of the folding pedals. Furthermore, the installation is vertical, with the bolt heads and nuts typically located on the side of the first fixing member. This ensures that the entire sliding assembly does not mechanically interfere with the ladder's uprights or their top / bottom when moving up and down, guaranteeing smooth sliding and the integrity of the travel.

[0016] Preferably, there are two or more of the first fastener and the second fastener.

[0017] In this design, by setting two or more first and / or second fixing components, the tread surface receives multi-point fixed support on the ladder, further improving the installation stability of the folding tread. The layout of multiple fixing components makes the load distribution more even, and even if a single fixing component becomes loose due to accident, the other fixing components can still maintain a reliable connection on the tread surface, providing redundant safety assurance. This is particularly suitable for high-altitude scenarios that require long-term standing work.

[0018] Preferably, the upper support arm and the lower support arm are rotatably connected by bolts, and the lower support arm is rotatably connected to the tread surface by bolts.

[0019] In this solution, standard universal bolts are used as hinge axes for both rotating connections, which greatly simplifies the types of parts, significantly reduces the difficulty of production and assembly, and ensures the rapid replacement and modular maintenance of parts on site.

[0020] Preferably, there are two folding mechanisms, symmetrically arranged on both sides of the tread surface.

[0021] In this design, two folding mechanisms are symmetrically positioned on both sides of the tread surface, ensuring both sides are supported and the force is evenly distributed, effectively preventing tread surface deflection or tilting caused by unilateral support. The symmetrical double-support structure makes the tread surface more stable when bearing the weight of workers, improving safety and comfort. Simultaneously, the symmetrical folding mechanisms on both sides move synchronously during folding, making the folding action of the entire tread surface smoother and more consistent.

[0022] Preferably, the distance between the two folding mechanisms is less than the width of the tread surface and matches the distance between the uprights of the ladder.

[0023] In this solution, by setting the spacing between the two folding mechanisms to match the spacing between the ladder columns, the folding mechanisms can precisely adapt to ladders of different specifications, ensuring that the folding mechanisms and the ladder columns are aligned. The spacing is smaller than the width of the tread surface, allowing the tread surface to completely cover the work area. At the same time, the folding mechanisms are located inside the tread surface, so they will not extend beyond the edge of the tread surface when folded, resulting in a more compact storage configuration.

[0024] Preferably, the second fixing member is positioned higher than the tread surface.

[0025] In this solution, by setting the second fixing member above the tread surface, the tread surface is slightly lower than the connection point between the second fixing member and the step bar after installation. The height difference creates an appropriate gap between the tread surface and the ladder step bar, avoiding direct contact and interference between the tread surface and the step bar. At the same time, it allows the tread surface to flip up and fold more smoothly when folding, improving the convenience of the folding operation.

[0026] Preferably, a groove is provided at the connection between the upper support arm and the tread.

[0027] In this design, a groove is provided at the connection between the upper support arm and the tread surface. This groove not only guides the upper support arm's sliding relative to the tread surface but also enables a rotational connection between them, allowing the upper support arm to maintain rotational freedom relative to the tread surface during sliding. The groove's compact structure integrates sliding and rotational motion functions, simplifying the folding mechanism and improving the reliability and consistency of the movement.

[0028] Preferably, when the upper support arm slides along the slide groove, the included angle between the upright of the ladder and the plane of the tread is in the range of 55°~70°.

[0029] In this design, by limiting the angle between the ladder's uprights and the tread surface to a range of 55° to 70° when the upper support arm slides, the optimal load-bearing angle of the tread surface is ensured when extended to the working state. Within this angle range, the tread surface provides a near-horizontal standing platform for workers, while the inclined bracing linkage is in an optimal stress state, with the most balanced stress distribution at each rotation point and sliding connection point. This ensures both load-bearing strength and avoids stability degradation caused by excessively large or small angles.

[0030] Preferably, the axial direction of the first fixing member is consistent with the extension direction of the ladder column.

[0031] In this design, by aligning the axis of the first fastener with the extension direction of the column, the first fastener can be fully fitted along the length of the column during installation. This ensures the maximum contact area and optimal stress angle between the first fastener and the column, avoiding uneven clamping force and additional bending moment caused by axial misalignment, thus improving the reliability and load-bearing capacity of the fixed connection. During actual installation, operators only need to align the first fastener along the column direction to complete the positioning, making installation more convenient and faster.

[0032] Preferably, the first fixing member is disposed on the side of the folding mechanism facing the upright of the ladder.

[0033] In this design, by placing the first fixing member on the side of the folding mechanism facing the column, the first fixing member can form the most direct connection path between the folding mechanism and the column, shortening the load transmission path, reducing intermediate connection links, and improving the overall structural rigidity. Simultaneously, the first fixing member is located inside the folding mechanism, allowing it to be shielded and protected by the folding mechanism in the folded state, reducing the risk of damage to exposed components and resulting in a cleaner and more aesthetically pleasing overall appearance.

[0034] The positive and progressive effects of this invention are as follows:

[0035] The first fixing component connects to the ladder column, and the second fixing component connects to the ladder treads, achieving two-point stable fixation of the folding treads on the ladder. This ensures the treads can bear the weight of the workers during use, maintaining stability and reliability. The diagonal bracing linkage bracket, through the sliding connection between the upper arm and the treads and the rotational engagement between the upper and lower arms, allows the treads to flexibly switch between the unfolded working state and the folded storage state. The diagonal bracing linkage bracket forms a robust triangular mechanical support structure with the upper arm slidingly connecting to the treads and the lower arm. This diagonal bracing design efficiently converts the working load into compressive stress transmitted along the linkage axis, and stably transmits the force to the main frame of the ladder through the sliding limit end and the rotational connection end. This ensures absolute stability under heavy loads, significantly improving safety and reliability. When folded, the upper arm slides along the treads, causing the entire tread to fit snugly against the side of the ladder, without occupying extra space. Attached Figure Description

[0036] Figure 1 This is a side view (a) of a folding step for a ladder and a ladder according to a preferred embodiment of the present invention.

[0037] Figure 2 This is a side view (II) of a preferred embodiment of the present invention, showing a folding step for a ladder and a ladder.

[0038] Figure 3 This is a front view of a folding step for climbing a ladder and a climbing ladder according to a preferred embodiment of the present invention.

[0039] Figure 4 This is a top view schematic diagram of a folding step for a ladder and a ladder according to a preferred embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of the structure of a folding step for a ladder according to a preferred embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures

[0042] Folding step 100 for ladder; fixing part 1; first fixing part 11; second fixing part 12; step surface 2; support structure 21; step 22; folding mechanism 3; upper support arm 31; lower support arm 32; ladder column 4; ladder rung 5; double bolt pipe clamp 6; bolt 61; pipe sleeve 62; slide groove 7; ladder 8. Detailed Implementation

[0043] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0044] like Figures 1-5As shown, this embodiment provides a folding step 100 for a ladder, which includes a fixing part 1, a step surface 2, and a folding mechanism 3. The folding mechanism 3 is a diagonal bracing linkage bracket, which includes an upper support arm 31 and a lower support arm 32. One end of the upper support arm 31 is slidably connected to the step surface 2, and the other end of the upper support arm 31 is rotatably connected to the lower support arm 32. One end of the lower support arm 32 is rotatably connected to the step surface 2. The fixing part 1 includes a first fixing member 11 and a second fixing member 12. The first fixing member 11 is rotatably connected to the end of the lower support arm 32 away from the step surface 2 and is detachably connected to the ladder column 4. The second fixing member 12 is disposed on the step surface 2 and is detachably connected to the ladder runner 5. The first fixing member 11 is slidably connected to the ladder column 4, and the second fixing member 12 is rotatably connected to the ladder runner 5.

[0045] In this embodiment, the first fixing member 11 and the second fixing member 12 form a double-point anchor with the uprights and steps of the ladder 8, ensuring that the steps 22 can bear load stably. Its inclined bracing linkage bracket adopts a sliding rotation linkage design. When unfolded, it forms a triangular mechanical configuration, which efficiently converts the working load into axial compressive stress and transmits it to the main frame of the ladder 8, significantly enhancing the structural rigidity and safety reliability under heavy load. When folded, it is slidably retracted through the upper support arm 31, so that the whole is tightly attached to the side wall of the ladder 8, effectively avoiding the occupation of external space.

[0046] Specifically, in this embodiment, the upper support arm 31 and the lower support arm 32 are rotatably connected by bolts, and the lower support arm 32 is rotatably connected to the tread surface 2 by bolts.

[0047] In other embodiments, pins or bearings may be provided at the above connection nodes for rotatable connection, which will not be described in detail here.

[0048] like Figures 1-4 As shown, the tread surface 2 also includes a support structure 21 and a footplate 22. The support structure 21 is located at the bottom of the footplate 22 and is made of equilateral angle steel. The footplate 22 is made of wire mesh. The support structure 21 uses equilateral angle steel as its bottom frame. Utilizing its high bending and torsional stiffness and symmetrical force characteristics, it can effectively distribute and bear the vertical load of the workers, significantly suppressing structural deflection under heavy loads and ensuring the high load-bearing stability of the footplate 22. The area of ​​the footplate 22 matches the size of the ladder 8. The wire mesh laid on the tread surface provides excellent anti-slip grip through its rough mesh structure to ensure climbing safety. Its hollow design significantly reduces the overall weight, facilitating folding operations. Furthermore, its porous nature gives the tread surface good water permeability, air permeability, and self-cleaning functions, effectively preventing water accumulation and corrosion.

[0049] In other embodiments, the material of the pedal 22 may also be an aluminum alloy plate or a wooden board, which will not be described in detail here.

[0050] Specifically, such as Figures 1-3 As shown, in this embodiment, the first fixing member 11 and the second fixing member 12 are double-bolt pipe clamps 6. The double-bolt pipe clamp 6 includes two correspondingly arranged pipe sleeves 62 and two bolts 61 arranged on both sides of the width direction of the pipe sleeves 62. Bolt holes are provided on the pipe sleeves 62, and the bolts 61 pass through the bolt holes and connect the two pipe sleeves 62. Adjusting the length of the bolts 61 screwed into the bolt holes can adjust the distance between the two pipe sleeves 62 and the space formed by the enclosed space between the two pipe sleeves 62. Furthermore, this progressive thread adjustment method, compared to traditional snap-fit ​​or pin release, avoids the mechanical impact and hand-pinning hazards caused by instantaneous pop-out, significantly improving the safety factor for workers operating at heights or in complex environments while ensuring structural stability. The axial direction of the second fixing member 12 is the same as the axial direction of the ladder 8's steps (e.g., Figure 3 (As shown by arrow C). There is one second fixing member 12, which is continuously arranged along the extension direction of the ladder's treads 5. There are two first fixing members 11, which are symmetrically arranged on both sides of the tread surface 2. The first fixing member 11 and the second fixing member 12 are double-bolt pipe clamps 6. The double-bolt pipe clamp 6 also includes bolts 61 symmetrically arranged along the axis. There are two bolts 61 on the first fixing member 11 and four bolts 61 on the second fixing member 12, which are symmetrically arranged along the center line of the body of the double-bolt pipe clamp 6.

[0051] like Figure 5 As shown, there are two folding mechanisms 3, symmetrically arranged on both sides of the tread surface 2. The distance between the two folding mechanisms 3 is less than the width of the tread surface 2 and matches the distance between the uprights 4 of the ladder. Setting the distance between the two folding mechanisms 3 to match the distance between the uprights of the ladder 8 achieves precise adaptation of ladders 8 of different specifications and reliable alignment between the mechanism and the upright. At the same time, this distance is set to be less than the width of the tread surface 2. This size layout ensures that the pedal 22 can completely cover the working area and that the folding mechanism 3 is always retracted within the boundary of the tread surface when stored, preventing it from protruding outwards during unfolding or folding. This significantly improves the overall compactness and space utilization of the folding and storage.

[0052] In other embodiments, the number of folding mechanisms 3 may be more than two, and the distance between the two folding mechanisms 3 may be wider than the distance between the columns 4 of the ladder. Two first fixing members 11 connected to the folding mechanism 3 are disposed on the side of the folding mechanism 3 facing the column 4 of the ladder. The distance between the two first fixing members 11 is matched with the distance between the columns 4 of the ladder, which will not be described in detail here.

[0053] Furthermore, in this embodiment, such as Figures 1-2As shown, a groove 7 is provided at the connection between the upper support arm 31 and the tread surface 2. A slider that cooperates with the groove 7 is provided at one end of the upper support arm 31 that connects to the tread surface 2. The extending direction of the groove 7 is the same as the extending direction of the support structures 21 at both ends of the pedal 22 (e.g., Figure 1 (As shown by arrow A in the diagram). The technical effect of this solution is mainly reflected in the synergistic improvement of manufacturing quality, motion performance, and assembly efficiency. The combined motion mode of rotation and sliding allows the upper support arm 31 to both rotate around its axis and slide in a specific direction. The extension direction of the slide groove 7 is consistent with the support structure 21 at both ends of the pedal 22, ensuring that the sliding guide matches the overall force direction, thereby effectively improving the stress distribution on the contact surface, avoiding local overload, and making the motion more stable and efficient.

[0054] In other embodiments, the slide 7 may also be a sliding hinge seat or a sliding bearing node, so as to adjust the tilt angle of the lower support arm 32 after the tilt angle of the ladder 8 changes, ensuring that the tread 22 is always parallel to the horizontal plane, which will not be described in detail here.

[0055] like Figures 1-2 As shown, in this embodiment, the second fixing member 12 is positioned higher than the tread surface 2. When the folding pedal 22 is assembled onto the ladder 8, the tread surface is lower than the height of the ladder's rung 5, which is assembled with the second fixing member 12. By positioning the second fixing member 12 higher than the tread surface 2, the top surface of the tread surface 2 is slightly lower than the connection point between the second fixing member 12 and the rung. This height difference creates a reasonable clearance between the tread surface 2 and the ladder 8 rung. This arrangement effectively avoids direct contact and movement interference between the tread surface 2 and the rung, and provides ample space for the tread surface 2 to move during folding and flipping, making its upward folding action smoother and more unobstructed, thereby significantly improving the convenience of folding operation and overall efficiency.

[0056] When the upper support arm 31 slides along the slide groove 7, the angle between the upright 4 of the ladder and the plane of the tread surface 2 (e.g.) Figure 1 and Figure 2 The angle α (as shown in the figure) ranges from 55° to 70°. By strictly limiting the angle between the ladder 8 upright and the tread surface 2 plane during the sliding of the upper support arm 31 to the range of 55° to 70°, the tread surface 2 can be at the optimal load-bearing angle when extended to the working state. Within this angle range, the tread surface 2 can provide workers with a near-horizontal standing platform, while the inclined bracing linkage also achieves the most ideal stress conditions. The load distribution on each rotating and sliding connection point tends to be balanced, thereby effectively avoiding stability degradation caused by excessively large or small angles while ensuring overall load-bearing strength.

[0057] In other embodiments, the included angle between the uprights 4 and the plane of the tread 2 of the ladder can be other angles to adapt to different placement scenarios of the inclined ladder, which will not be elaborated here.

[0058] like Figures 1-2 As shown, the axial direction of the first fixing member 11 is parallel to the extension direction of the ladder 8 upright (e.g., Figure 1 As indicated by arrow B, the first fixing member 11 is located on the side of the folding mechanism 3 facing the ladder 8 column. The first fixing member 11 is connected to the folding mechanism 3 by bolts 61, and the extension direction of bolts 61 is perpendicular to the extension axis of the first fixing member 11. Bolts 61 have the dual functions of fastening connection and hinge pivot, and together with the sliding of the ladder column 4, they enable convenient disassembly and assembly of the steps and angle adjustment. At the same time, the bolts 61 adopt a lateral installation layout, which effectively avoids mechanical interference with the ladder column 4 vertically, thereby ensuring the smoothness of the sliding process and the integrity of the lifting stroke.

[0059] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A folding step for a ladder, characterized in that, The folding tread for the ladder includes a fixing part, a tread part and a folding mechanism. The folding mechanism is a diagonal bracing linkage bracket. The diagonal bracing linkage bracket includes an upper support arm and a lower support arm. One end of the upper support arm is slidably connected to the tread part, and the other end of the upper support arm is rotatably connected to the lower support arm. One end of the lower support arm is rotatably connected to the tread part. The fixing part includes a first fixing member and a second fixing member. The first fixing member is rotatably connected to the end of the lower support arm away from the tread surface and is detachably connected to the upright of the ladder. The second fixing member is disposed on the tread surface and is detachably connected to the step bar of the ladder. The first fixing member is slidably connected to the upright of the ladder, and the second fixing member is rotatably connected to the step bar of the ladder.

2. The folding step for a ladder as described in claim 1, characterized in that, The first fixing member and the second fixing member are double-bolt pipe clamps. The double-bolt pipe clamp includes two pipe sleeves that are correspondingly arranged and two bolts arranged on both sides of the pipe sleeve in the width direction. The pipe sleeve is provided with bolt holes, and the bolts pass through the bolt holes and connect the two pipe sleeves. And / or, the axial direction of the second fastener is consistent with the axial direction of the ladder's rungs; And / or, the first fixing member is connected to the lower support arm by bolts, wherein the extension direction of the bolts is perpendicular to the extension axis of the first fixing member.

3. The folding step for a ladder as described in claim 1, characterized in that, The number of the first fastener and / or the second fastener is two or more; And / or, the upper support arm and the lower support arm are rotatably connected by bolts, and the lower support arm is rotatably connected to the tread surface by bolts.

4. The folding step for a ladder as described in claim 1, characterized in that, There are two folding mechanisms, symmetrically arranged on both sides of the tread surface.

5. The folding step for a ladder as described in claim 4, characterized in that, The spacing between the two folding mechanisms is less than the width of the tread surface and matches the spacing between the ladder posts.

6. The folding step for a ladder as described in claim 1, characterized in that, The second fastener is positioned above the tread surface.

7. The folding step for a ladder as described in claim 1, characterized in that, A sliding groove is provided at the connection between the upper support arm and the tread.

8. The folding step for a ladder as described in claim 7, characterized in that, When the upper support arm slides along the slide groove, the angle between the upright of the ladder and the plane of the tread is in the range of 55°~70°.

9. The folding step for a ladder as described in claim 1, characterized in that, The axial direction of the first fixing member is consistent with the extension direction of the ladder column.

10. The folding step for a ladder as described in claim 1, characterized in that, The first fixing member is disposed on the side of the folding mechanism facing the ladder column.

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