Building block type height-adjustable ladder
By using a modular adjustable ladder with pins and limit blocks, the problem of ladder height incompatibility in grain silos is solved, enabling stable use and convenient operation of ladders in grain silos, adapting to different grain surface heights, and facilitating storage and retrieval.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOGRAIN HONGHU DIRECT STORAGE CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-17
AI Technical Summary
The existing ladders in the grain warehouse are unstable due to differences in grain surface height, and the height cannot be effectively adjusted to adapt to different grain surface heights, affecting the safety and convenience of the staff.
A modular adjustable height ladder was designed. The ladder can be detachably connected and fixed by a combination of pins and limit blocks. The base plate is used to increase the contact area to prevent it from sinking into the grain pile. The pins are kept stable and fixed by counterweight handles and gravity.
It enables the stable use of ladders inside grain warehouses, can adapt to different grain surface heights, facilitates staff movement, and has a simple structure, low cost, and is easy to store and fold.
Smart Images
Figure CN224134552U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ladder technology, specifically a modular adjustable height ladder. Background Technology
[0002] In existing technologies for storing rice, wheat, corn, and soybeans in grain silos, the difference in bulk density results in different grain surface heights, leading to varying height differences between the work platform inside the silo and the upper part of the grain surface. While existing ladders can control the climbing height by tilting at different angles, they are unstable when used at the upper part of the grain surface in a grain silo. Therefore, an improved modular adjustable height ladder is needed to address this issue. Utility Model Content
[0003] The purpose of this invention is to provide a modular adjustable height ladder to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a modular adjustable height ladder, comprising a first ladder, with first uprights fixedly installed on both sides of the middle of the first ladder, a second ladder movably fitted inside the first ladder between the first uprights, a second upright fixedly installed on the middle of the inner side of the second ladder, and a third ladder movably fitted inside the second ladder between the second uprights. Fixing mechanisms are provided on the surfaces of both the first and second ladders, each fixing mechanism including a fixing block, a through groove, a pin, and a slot. Fixing blocks are fixedly installed at the four corners of the lower surfaces of both the first and second ladders, each fixing block having a through groove in its middle, with a pin movably inserted inside the through groove, and slots being provided on the surfaces of both the first and second uprights.
[0005] Preferably, a limiting block is fixedly provided at both the upper and lower ends of the pin surface. This limiting block can ensure that the pin is not easily pulled out of the slot without human intervention.
[0006] Preferably, the slots are symmetrically opened at the upper and lower ends of the surfaces of the first and second columns. When the pin of the second or third ladder is inserted into the upper slot, the second or third ladder can be fixedly protruded. Conversely, when the pin of the second or third ladder is inserted into the lower slot, the second ladder can be fixedly stored inside the first ladder, or the third ladder can be fixedly stored inside the second ladder.
[0007] Preferably, one end of the pin is chamfered, which makes it easier to insert the pin into the slot.
[0008] Preferably, a counterweight handle is fixedly provided at one end of the pin.
[0009] Preferably, a load-bearing base plate is fixedly installed at the lower end of the first ladder, such as... Figure 7 The diagram shown illustrates the use of this device. The lower end of the first ladder needs to be in contact with the surface of the grain pile. The force-bearing base plate can significantly increase the contact area of the device to prevent it from sinking into the grain pile.
[0010] Compared with the prior art, the beneficial effects of this utility model are:
[0011] 1. This utility model can be stacked together like building blocks to serve as a ladder, and can also be quickly stored together for easy storage. The foundation of the device relies on a load-bearing base plate, which can significantly increase the contact area of the device to prevent it from sinking into the grain pile. It is specially designed for use on grain warehouse work platforms and can compensate for the height distance between the work platform in the grain warehouse and the upper part of the grain surface, so that workers can walk to the upper part of the grain surface for convenient sampling and inspection.
[0012] 2. When using this utility model, under the action of the counterweight handle and gravity, the limiting block on the surface of the pin is always in a vertical state without human intervention. In this way, after the pin is inserted into the slot through the through groove in the middle of the fixing block, it is difficult for it to come out by itself because the limiting block and the through groove interfere with each other in the vertical state. When it is necessary to manually pull the pin out of the slot, the limiting block is made horizontal so that the pin can be pulled out freely from the through groove. This releases the fixation. This device can achieve a relatively simple and stable fixing effect, which is convenient to use and has a very low cost. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of the modular adjustable height ladder of this utility model;
[0014] Figure 2 This is a bottom view of the modular adjustable height ladder of this utility model;
[0015] Figure 3 This is an exploded view of the modular adjustable height ladder of this utility model;
[0016] Figure 4 This utility model is a modular adjustable height ladder. Figure 2 Enlarged view at point A in the middle;
[0017] Figure 5 This utility model is a modular adjustable height ladder. Figure 3 Enlarged view at point B;
[0018] Figure 6 This is a storage view of the device in the modular adjustable height ladder of this utility model;
[0019] Figure 7 This is a view illustrating the working principle of the device in the modular adjustable height ladder of this utility model.
[0020] In the diagram: 1. First ladder; 2. First column; 3. Second ladder; 4. Second column; 5. Third ladder; 6. Fixing block; 7. Through groove; 8. Pin; 9. Slot; 10. Limiting block; 11. Chamfer; 12. Counterweight handle; 13. Load-bearing base plate. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Please see Figure 1-7 This utility model provides a technical solution: a modular adjustable height ladder, including a first ladder 1, with first columns 2 fixedly installed on both sides of the middle of the first ladder 1, a second ladder 3 movably fitted inside the first ladder 1 between the first columns 2, a second column 4 fixedly installed on the middle of the inner side of the second ladder 3, and a third ladder 5 movably fitted inside the second ladder 3 between the second columns 4. The surfaces of the first ladder 1 and the second ladder 3 are each provided with a fixing mechanism, the fixing mechanism including a fixing block 6, a through groove 7, a pin 8, and a slot 9. Fixing blocks 6 are fixedly installed at the four corners of the lower surfaces of the first ladder 1 and the second ladder 3, the fixing block 6 has a through groove 7 in the middle, the through groove 7 has a pin 8 movably inserted inside, and the surfaces of the first column 2 and the second column 4 are each provided with a slot 9.
[0023] The upper and lower ends of the pin 8 are fixedly provided with limiting blocks 10. The limiting blocks 10 can ensure that the pin 8 is not easily pulled out of the slot 9 without human operation.
[0024] The slots 9 are symmetrically opened at the upper and lower ends of the surfaces of the first column 2 and the second column 4. When the pin 8 of the second ladder 3 or the third ladder 5 is inserted into the upper slot 9, the second ladder 3 or the third ladder 5 can be fixedly protruded. Conversely, when the pin 8 of the second ladder 3 or the third ladder 5 is inserted into the lower slot 9, the second ladder 3 can be fixedly stored inside the first ladder 1, or the third ladder 5 can be fixedly stored inside the second ladder 3.
[0025] The pin 8 has a chamfer 11 at one end, which makes it easier to insert the pin 8 into the slot 9.
[0026] A counterweight handle 12 is fixedly installed at one end of the pin 8. This design is ingenious; under the action of the counterweight handle 12 and gravity, the limiting block 10 on the surface of the pin 8 remains vertical unless manually operated. This makes it difficult for the pin 8 to retract on its own after being inserted into the slot 9 through the through groove 7 in the middle of the fixing block 6, because the vertically positioned limiting block 10 and through groove 7 interfere with each other. Therefore, when manual removal of the pin 8 from the slot 9 is required, a counterweight handle 12 is fixed at one end of the pin 8. Figure 5 Rotate the pin 890 degrees away from the third ladder 5 from the indicated perspective, so that the limiting block 10 is horizontal. This allows the pin 8 to be freely pulled out of the through slot 7, thus releasing the fixation. This allows the second ladder 3 to be stored inside the first ladder 1, or the third ladder 5 to be stored inside the second ladder 3. In this way, the device can be stacked like building blocks or quickly stored together. Moreover, the entire process of fixing and releasing the device requires no tools, such as wrenches or screwdrivers, and can be done by hand, making the device more convenient to operate. At the same time, the fixing mechanism of the device is very low in cost, making it easy to promote and use.
[0027] The lower end of the first ladder 1 is fixedly equipped with a load-bearing base plate 13, such as Figure 7 The diagram shown illustrates the use of this device. The lower end of the first ladder 1 needs to be in contact with the surface of the grain pile. The force-bearing base plate 13 can significantly increase the contact area of the device to prevent it from sinking into the grain pile.
[0028] Working principle: When using this device, it can be stacked together like building blocks to serve as a ladder, or it can be quickly stored together for easy storage. The device's foundation relies on the load-bearing base plate 13, which significantly increases the device's contact area to prevent it from sinking into the grain pile. It is specifically designed for use on grain warehouse work platforms and can compensate for the height distance between the work platform inside the grain warehouse and the upper part of the grain surface, making it easier for workers to walk to the upper part of the grain surface for spot checks and other tasks.
[0029] Furthermore, during use, the counterweight handle 12 and gravity ensure that the limiting block 10 on the surface of the pin 8 remains vertical unless manually operated. This makes it difficult for the pin 8 to retract on its own after being inserted into the slot 9 through the through groove 7 in the middle of the fixing block 6, because the vertically positioned limiting block 10 and through groove 7 interfere with each other. Therefore, when manual removal of the pin 8 from the slot 9 is required, [further instructions are needed]. Figure 5 Rotate the pin 8 90 degrees away from the third ladder 5 from the shown perspective, so that the limiting block 10 is horizontal. In this way, the pin 8 can be freely pulled out from the through slot 7, thus releasing the fixation. This allows the device to achieve a stable fixing effect with a relatively simple fixing structure, which is convenient to use and has a very low cost.
[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A modular height adjustable ladder comprising a first ladder (1), characterized in that: First columns (2) are fixedly installed on both sides of the middle of the first ladder (1). A second ladder (3) is movably fitted inside the first ladder (1) between the first columns (2). A second column (4) is fixedly installed in the middle of the inner side of the second ladder (3). A third ladder (5) is movably fitted inside the second ladder (3) between the second columns (4). Fixing mechanisms are provided on the surfaces of the first ladder (1) and the second ladder (3). The fixing mechanisms include fixing blocks (6), through grooves (7), pins (8), and slots (9). Fixing blocks (6) are fixedly installed at the four corners of the lower surfaces of the first ladder (1) and the second ladder (3). A through groove (7) is opened in the middle of the fixing block (6). A pin (8) is movably inserted inside the through groove (7). Slots (9) are opened on the surfaces of the first column (2) and the second column (4).
2. The modular height-adjustable ladder of claim 1, wherein: Limiting blocks (10) are fixedly provided at both the upper and lower ends of the surface of the pin (8).
3. The modular height-adjustable ladder of claim 1, wherein: The slots (9) are symmetrically opened at the upper and lower ends of the surfaces of the first column (2) and the second column (4).
4. The modular height-adjustable ladder of claim 1, wherein: One end of the pin (8) is provided with a chamfer (11).
5. The modular height-adjustable ladder of claim 1, wherein: A counterweight handle (12) is fixedly installed at one end of the pin (8).
6. The modular height-adjustable ladder of claim 1, wherein: The first ladder (1) has a fixed load-bearing base plate (13) at its lower end.