Escape ladder step set

Abstract

This utility model provides an escape ladder step assembly, belonging to the field of escape ladder technology. It includes steps, each step consisting of two symmetrically arranged flexible webbings connected to a set of rungs. Each rung has two sets of symmetrically arranged through-holes, each set including a first through-hole and a second through-hole. The webbing passes through the first and second through-holes sequentially and extends to the outside of the rung's sidewall. The webbing forms on the rung: a first contact section abutting the upper surface of the rung, located between the first and second through-holes; and a second contact section abutting the lower surface of the rung, located between the second through-hole and the corresponding rung's sidewall. The second contact section is fixedly pressed to the rung by rivets. This utility model uses a multi-segment contact structure to transfer loads along the entire length of the webbing, rather than concentrating them at a single point, thus improving the utilization rate of the webbing's tensile strength and extending its service life.

Description

Technical Field

[0001] This utility model belongs to the field of escape ladder technology and relates to an escape ladder step assembly. Background Technology

[0002] With the acceleration of urbanization, more and more people are living in high-rise buildings. However, fires can occur in buildings at any time, and most residents will purchase escape equipment in their homes, such as escape ladders. Escape ladders, also known as fire escape ladders, are building facilities that serve as escape routes in case of fire. Fire protection laws in many countries stipulate their installation and include them in the inspection items for building fire protection licenses. Currently, most external escape ladders are made of ropes, with ropes on both sides and a footboard in the middle.

[0003] The existing patent document with authorization publication number CN202144719U discloses a portable combination escape ladder. The portable combination escape ladder is characterized by including symmetrically arranged hooks, each hook having a hooking portion and connecting to a step via a step connecting portion. Each step is composed of two symmetrically arranged flexible webbings connecting to a set of step stops, and the webbings are fixedly screwed to the step stops via fixing washers.

[0004] However, the aforementioned existing technologies still have the following shortcomings:

[0005] In existing technologies, the forces on the webbing are concentrated along the same axis, resulting in a high concentration of stress at the bolted joint between the webbing and the ladder rungs. This point-concentrated stress structure easily leads to stress concentration around the bolt holes, causing excessive local load on the webbing. This not only increases the risk of the webbing tearing or breaking at this weak point, reducing the overall load-bearing reliability and safety of the escape ladder, but also fails to fully utilize the overall tensile strength of the webbing material. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an escape ladder step assembly to solve the problems mentioned in the background technology. This utility model adopts a multi-segment contact structure so that the load is transmitted through the entire length of the webbing, rather than concentrated at a single point, thereby improving the utilization rate of the tensile strength of the webbing.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0008] An escape ladder step assembly includes steps, each step being formed by two symmetrically arranged flexible webbings connected to a set of steps, each set of steps having two symmetrically arranged through holes, each set of through holes including a first through hole and a second through hole.

[0009] One end of the webbing passes through the first through hole and the second through hole in sequence and extends to the outside of the side wall of the ladder rung;

[0010] The webbing is formed on the step:

[0011] The first contact section is in contact with the upper surface of the step rung, and the first contact section is located between the first through hole and the second through hole;

[0012] The second contact section is in contact with the lower surface of the step runner, and the second contact section is located between the second through hole and the corresponding side wall of the step runner;

[0013] The second contact section is fixedly pressed to the ladder rung by rivets.

[0014] Furthermore, each step of the ladder is fixed with a foot on one side that maintains a distance from the wall.

[0015] Furthermore, the step area of ​​the ladder is provided with anti-slip stripes.

[0016] Furthermore, the end of the webbing is provided with a loop structure for suspension.

[0017] Furthermore, the step also includes a storage strap, which is fixedly screwed to the uppermost step via a fixing pad. One end of the storage strap is fixed with a hook-and-loop fastener, and the other end of the storage strap is fixed with a loop fastener.

[0018] Furthermore, both the sidewall of the step and the inner wall of the first through hole have arc-shaped portions to reduce friction.

[0019] Furthermore, the two first through holes on the same step are located between the two corresponding second through holes.

[0020] Furthermore, between adjacent steps, the webbing is connected from the outside of the side wall of the lower step to the first through hole of the upper step.

[0021] Furthermore, a fastening washer is provided on the lower surface of the second contact section, and the rivet passes through the step block, the second contact section, and the fastening washer in sequence to fix them.

[0022] The beneficial effects of this utility model are:

[0023] The webbing passes through the first through hole and the second through hole in sequence, and bends and extends to form a double contact section. The first contact section is attached to the upper surface of the ladder rung, and the second contact section is attached to the lower surface of the ladder rung and screwed in to fix it, forming at least multiple distributed stress points. The multi-segment contact structure allows the load to be transferred through the entire length of the webbing, rather than concentrated at a single point, which improves the utilization rate of the tensile strength of the webbing, extends the service life of the webbing, and effectively reduces the risk of the webbing breaking when using the escape ladder.

[0024] The ladder rungs of this utility model are equipped with foot braces to maintain a certain distance between each rung and the wall, making it easier for users to step on them. The stability of the rungs ensures that the webbing is subjected to stable force.

[0025] This invention, by setting an arc-shaped part, effectively reduces the wear of the webbing between the webbing and the rungs during the use of the escape ladder steps, thereby extending the service life of the webbing. Attached Figure Description

[0026] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model;

[0028] Figure 2 This is a partial sectional view of Embodiment 1 of the present utility model;

[0029] Figure 3 This is a side sectional view of the ladder rung of Embodiment 1 of this utility model;

[0030] Figure 4 This is a top view of the ladder rung of Embodiment 1 of this utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the storage strap according to Embodiment 1 of this utility model;

[0032] Figure 6 This is Embodiment 1 of the present utility model. Figure 2 Enlarged view of point A in the middle;

[0033] Figure 7 This is a partial structural cross-sectional view of Embodiment 2 of this utility model.

[0034] In the diagram: 1. Webbing; 2. Ladder step; 3. First through hole; 4. Second through hole; 5. First contact section; 6. Second contact section; 7. Storage strap; 8. Hook and loop fastener; 9. Loose hook and loop fastener; 10. Foot; 11. Curved part; 12. Rivet; 13. Fastening washer. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0036] Example 1

[0037] like Figure 1-4 As shown in Figure 6, an escape ladder step assembly includes steps, each step being formed by two symmetrically arranged flexible webbing 1 connected to a set of step stops 2. The step stops 2 are provided with two sets of symmetrically arranged through holes, each set of through holes including a first through hole 3 and a second through hole 4, with the two first through holes 3 located between the two second through holes 4.

[0038] The webbing 1 passes through the first through hole 3 and the second through hole 4 in sequence and extends to the outside of the side wall of the ladder rung 2;

[0039] The webbing 1 is formed on the step 2:

[0040] The first contact section 5 is in contact with the upper surface of the step 2, and the first contact section 5 is located between the first through hole 3 and the second through hole 4;

[0041] The second contact section 6 is in contact with the lower surface of the step 2, and the second contact section 6 is located between the second through hole 4 and the corresponding side wall of the step 2;

[0042] The second contact section 6 is fixedly pressed to the step 2 by rivets 12;

[0043] Between adjacent step 2, the webbing 1 is connected from the side wall of the lower step 2 to the first through hole 3 of the upper step 2. The lower surface of the second contact section 6 is provided with a fastening washer 13. The rivet 12 passes through the step 2, the second contact section 6, and the fastening washer 13 in sequence and fixes them. One end of the rivet 12 that passes through the step 2, the second contact section 6, and the fastening washer 13 is crimped by an external tool to form a locking part. The fastening washer 13 is located between the locking part and the second contact section 6.

[0044] One end of the webbing 1 passes through the first through hole 3 of the same through hole group from bottom to top, and then passes through the second through hole 4 of the same through hole group from top to bottom. When in use, the step is opened and one end of the webbing 1 extends upward around the side wall of the step 2, with the side wall of the webbing 1 abutting against the side wall of the step 2.

[0045] like Figure 1 , 5 As shown, the stair step also includes a storage strap 7, which is fixedly screwed to the uppermost step 2 via a fixing pad. A hook-and-loop fastener 8 is fixed to one end of the storage strap 7, and a loose-fitting hook-and-loop fastener 9 is fixed to the other end. By bending the storage strap 7, the hook-and-loop fastener 8 and the loose-fitting hook-and-loop fastener 9 are aligned and bonded together, forming a closed-loop storage structure.

[0046] like Figure 1 , 3 As shown, each step 2 is fixed with a pair of feet 10 on one side, maintaining a distance from the wall. The feet 10 extend outward from one side of the step 2, and the ends of the feet 10 have flat surfaces. The step area of ​​the step 2 is provided with anti-slip stripes, which can increase the friction of the step and indirectly reduce the dynamic load fluctuation of the webbing 1. The stability of personnel stepping on it makes the webbing 1 bear force smoothly.

[0047] The end of the webbing 1 is provided with a loop structure for suspension.

[0048] The specific operation method of this utility model is as follows:

[0049] Open the storage strap 7 to detach the hook-and-loop fastener 8 from the loop fastener 9. Hold the top rung 2 and open the rung assembly. Hang the loop structure formed at the end of the webbing 1 on the matching escape ladder hook. After hanging, the footrest 10 of each rung 2 is close to the wall to prevent the ladder from shaking. At the same time, there is a certain distance between the rung 2 and the wall, so that the user's feet can more easily step on the rung 2.

[0050] When storing: Fold the ladder set, hold the free end of the storage strap 7, bend the storage bag, and press the hook and loop fasteners 8 and 9 together to form a closed loop structure to lock the folded escape ladder.

[0051] In this invention, the webbing 1 passes sequentially through the first through hole 3 and the second through hole 4, and is bent and extended to form a double contact segment. The first contact segment 5 is attached to the upper surface of the step 2, and the second contact segment 6 is attached to the lower surface of the step 2 and screwed in. With the frictional contact of the sidewalls of the first through hole 3 and the second through hole 4, multiple stress points are formed. The multi-segment contact structure allows the load to be transferred along the entire length of the webbing 1, rather than being concentrated at a single point, thus greatly improving the utilization rate of the tensile strength of the webbing 1.

[0052] Effectively improves the overall reliability of the escape ladder steps: even if a certain contact point fails unexpectedly, such as a loose screw connection, the remaining contact points can still maintain a large load-bearing capacity through friction and the tension of the webbing 1.

[0053] Example 2

[0054] like Figure 7 As shown, both the sidewall of the ladder step 2 and the inner sidewall of the first through hole 3 have arc-shaped portions 11 for reducing friction. Compared to Embodiment 1, the arc-shaped portions in Embodiment 2 effectively reduce wear on the contact surfaces between the webbing and the ladder step 2 during use, thus extending the service life of the webbing.

[0055] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An escape ladder staircase assembly, comprising steps, wherein the steps are formed by two symmetrically arranged flexible webbing (1) connected to a set of ladder supports (2), characterized in that: The step (2) is provided with two sets of symmetrically arranged through holes, each set of through holes including a first through hole (3) and a second through hole (4); One end of the webbing (1) passes through the first through hole (3) and the second through hole (4) in sequence and extends to the outside of the side wall of the ladder rung (2); The webbing (1) is formed on the step (2): The first contact section (5) is in contact with the upper surface of the step (2), and the first contact section (5) is located between the first through hole (3) and the second through hole (4); The second contact section (6) is in contact with the lower surface of the step (2), and the second contact section (6) is located between the second through hole (4) and the side wall of the corresponding step (2); The second contact section (6) is fixedly pressed to the step (2) by rivets (12).

2. The escape ladder step assembly according to claim 1, characterized in that, Each of the step runners (2) has a foot (10) fixed on one side to maintain a distance from the wall.

3. The escape ladder step assembly according to claim 1, characterized in that, The step (2) is provided with anti-slip stripes at the foot.

4. The escape ladder step assembly according to claim 1, characterized in that, The end of the webbing (1) is provided with a loop structure for suspension.

5. An escape ladder staircase assembly according to claim 1, characterized in that, The step also includes a storage strip (7), which is fixedly screwed to the uppermost step (2) by a fixing pad. One end of the storage strip (7) is fixed with a hook-and-loop fastener (8), and the other end of the storage strip (7) is fixed with a loop fastener (9).

6. The escape ladder step assembly according to claim 1, characterized in that, The sidewall of the step (2) and the inner sidewall of the first through hole (3) both have arc-shaped portions (11) for reducing friction.

7. An escape ladder staircase assembly according to claim 1, characterized in that, The two first through holes (3) on the same step (2) are located between the two corresponding second through holes (4).

8. An escape ladder staircase assembly according to claim 1, characterized in that, Between adjacent steps (2), the webbing (1) is connected from the outside of the side wall of the lower step (2) to the first through hole (3) of the upper step (2).

9. An escape ladder staircase assembly according to claim 1, characterized in that, The lower surface of the second contact section (6) is provided with a fastening washer (13), and one end of the rivet (12) passes through the step (2), the second contact section (6), and the fastening washer (13) in sequence and fixes it.

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