Large-platform herringbone ladder

Abstract

The utility model relates to a large platform herringbone ladder which comprises a front ladder frame, a rear ladder frame, connecting lugs, a pedal platform, anti-skid foot sleeves and a tool box, the front ladder frame and the rear ladder frame are connected together through the connecting lugs, and the front ladder frame and the rear ladder frame are mutually unfolded or folded; the front part of the pedal platform is hinged to the front ladder frame, the pedal platform takes the hinged part as a rotating center, the rear ladder frame is provided with a pedal stick, and when the front ladder frame and the rear ladder frame are mutually unfolded, the rear part of the pedal platform is propped against the pedal stick, so that the unfolded herringbone ladder is A-shaped; according to the herringbone ladder, the front ladder frame and the rear ladder frame are connected through the connecting lugs, and the herringbone ladder is in an A shape after being unfolded, so that the ladder is more stable in use. And the pedal platform hinge structure between the front ladder frame and the rear ladder frame can reliably support the ladder when the ladder is unfolded, so that the safety of the ladder is further improved.

Description

Technical Field

[0001] The utility model relates to a large-platform herringbone ladder. Background Art

[0002] Ladders are indispensable tools in daily life and industrial fields. Their safety and stability are directly related to the personal safety of users.

[0003] Especially in scenarios such as high-altitude operations, the structural stability, load-bearing capacity and anti-slip performance of ladders require extremely high standards.

[0004] However, due to differences in standards and production cost control, the ladder products currently on the market often cannot meet stringent safety requirements.

[0005] Therefore, it is very important to invent a safe and reliable ladder that not only meets the various safety testing requirements of the ANSI standard (such as pressure test, tread bending test, ladder frame bending test, torsional stability test, horizontal pull test, slip test, etc.), but also meets the demand for high cost performance. Utility Model Content

[0006] The purpose of the utility model is to provide a large-platform stepladder that is safe and has a high cost-effectiveness ratio.

[0007] The purpose of this utility model is achieved in this way:

[0008] A large-platform stepladder comprises a front ladder frame, a rear ladder frame, connecting ears, a step platform, anti-slip foot covers and a tool box. The front ladder frame and the rear ladder frame are connected together by the connecting ears, and the front ladder frame and the rear ladder frame can be expanded or retracted with each other.

[0009] The front portion of the step platform is hinged to the front ladder frame, and the step platform rotates around the hinge. The rear ladder frame is provided with a step rod. When the front ladder frame and the rear ladder frame are unfolded, the rear portion of the step platform abuts against the step rod, so that the unfolded step ladder is in an "A" shape.

[0010] The front ladder frame includes a front ladder frame tube, and the front ladder frame tube is a "C"-shaped front ladder frame tube;

[0011] The rear ladder frame includes a rear ladder frame tube, and the rear ladder frame tube is a "C"-shaped rear ladder frame tube;

[0012] The anti-slip foot covers are respectively arranged at the lower ends of the front ladder frame tube and the rear ladder frame tube;

[0013] The tool box is arranged on the top of the front ladder frame. The front part of the tool box is provided with an opening for the user to enter at a front position corresponding to the front position of the step platform. The rear part of the tool box extends toward the rear ladder frame.

[0014] This stepladder features front and rear frames connected by connecting lugs, forming an "A" shape when unfolded, making the ladder more stable during use. The hinged structure of the step platform between the front and rear frames provides reliable support when the ladder is unfolded, further enhancing the ladder's safety.

[0015] The front and rear frames of this stepladder are connected by connecting lugs, forming an "A" shape when unfolded, ensuring the ladder's stability. The front of the step platform is hinged to the front frame, while the rear is supported by the rungs of the rear frame, forming a reliable support structure. This design ensures the overall stability and sturdiness of the ladder when unfolded, effectively reducing the risk of wobbling and tipping during use.

[0016] Both the front and rear ladder frames adopt a "C"-shaped frame tube structure. Compared with the traditional rectangular frame tube, this design saves about 1 / 4 of the material usage while ensuring strength, reduces production costs, and makes the ladder lighter, easier to carry and use.

[0017] The bottom of the front and rear ladder frames are equipped with anti-slip feet to effectively prevent the ladder from sliding on various surfaces. This design is particularly effective on wet, slippery or uneven floors, further enhancing safety during use and making it suitable for a variety of environments.

[0018] The toolbox is designed at the top of the ladder and has an opening at the front, allowing users to move freely while standing and avoiding the discomfort caused by space constraints. The rear of the toolbox extends towards the rear ladder frame, allowing users to easily access tools, reducing the frequency of going up and down the ladder and improving work efficiency.

[0019] The toolbox is offset from the leg section, shifting the toolbox back a distance to increase the available standing space on the top platform. This ensures the user's center of gravity doesn't shift backwards during operation, further enhancing safety. This design effectively prevents accidental falls due to an unstable center of gravity and is particularly suitable for working at height.

[0020] The platform features an articulated design, with the front end hinged to the front ladder frame and the rear end resting on the rungs of the rear ladder frame, ensuring stable support when the ladder is deployed. Furthermore, the platform can be made of steel, aluminum, or plastic to meet the needs of different usage scenarios while also enhancing its durability.

[0021] This ladder is not only suitable for home use, but also meets the high-intensity work demands of industrial and commercial scenarios. Its large footplate and convenient tool box design greatly enhance the convenience and safety of the work, and is particularly suitable for users who need to frequently change tools or stand for long periods of time.

[0022] The purpose of the utility model can also be solved by the following technical measures:

[0023] Furthermore, the front ladder frame also includes pedals, the front ladder frame tubes stand opposite to each other, the distance between the front ladder frame tubes gradually decreases from bottom to top, and the pedals are spaced between the front ladder frame tubes.

[0024] The front ladder tubes stand opposite each other, and as the height increases, the distance between the two front ladder tubes gradually decreases, forming a more compact structure. This design fully utilizes the ladder's geometry, improves the stability of the overall structure, makes the ladder more stable when deployed, and thus improves user safety.

[0025] The steps are spaced between the front frame tubes, ensuring evenly distributed steps for easier operation at different heights. The appropriate spacing between each step reduces the difficulty of climbing up and down, allowing users to select the appropriate working height based on their needs and reduce fatigue.

[0026] The tight connection between the steps and the front ladder frame ensures the load-bearing capacity of each step and prevents loosening or sliding during use. This sturdy step design makes climbing and standing safer for users and is particularly suitable for scenes requiring long-term work.

[0027] By optimizing the design of the front ladder frame and the rational layout of the pedals, this improvement not only enhances the safety and comfort of the ladder, but also improves the product's space utilization efficiency and portability, further enhancing its market competitiveness.

[0028] Furthermore, the rear ladder frame tubes are opposite to each other, and the distance between the rear ladder frame tubes gradually decreases from bottom to top, and the treads are arranged at intervals between the rear ladder frame tubes.

[0029] The tapering rear ladder tubes form a stable trapezoidal structure, significantly enhancing the overall stability of the ladder. This design helps distribute and evenly transfer the load, reducing single-point stress, thereby increasing the ladder's load-bearing capacity and service life.

[0030] Furthermore, a support tube is provided at the bottom of the pedal platform, the pedal platform and the support tube are rotatably connected, and both ends of the support tube extend out of the pedal platform and are inserted into the corresponding front ladder frame tubes of the front ladder frame to connect with the corresponding front ladder frame tubes.

[0031] The step platform is larger than the other steps, forming a large platform. A support tube structure at the bottom of the step platform significantly increases the ladder's load-bearing capacity. Both ends of the support tube are inserted into the front ladder frame tube, allowing the load to be transferred directly from the step to the ladder frame, eliminating reliance solely on the step. This load-bearing distribution design allows the ladder to withstand greater loads during use, ensuring safety and stability under high load conditions.

[0032] The tight connection between the support tube and the front ladder frame further enhances the stability of the step platform, reducing bending or deformation during use. Even with long-term or frequent use, the step platform can remain stable and ensure its service life.

[0033] The support tube is pivotally connected to the step platform, ensuring the step remains stable when the ladder is deployed, preventing safety hazards caused by instability or falling. This structure ensures safer operation on the step platform and effectively reduces the possibility of slipping or tilting during operation.

[0034] The support tube is inserted into the front ladder frame tube, resulting in a simple and easy-to-install design. Compared to traditional connection methods, this design eliminates the need for additional fasteners and complex assembly steps, reducing production and maintenance costs. This also results in a more compact ladder structure, fewer components, and improved reliability.

[0035] The pivoting connection between the support tube and the platform allows the ladder to be easily folded when not in use. The flexibility of the platform and support tubes improves the efficiency of folding the ladder, reduces storage space requirements, and facilitates storage and transportation when not in use.

[0036] Furthermore, it also includes an upper connecting rod, one end of which is connected to the step platform, and the other end of which is connected to the rear ladder frame.

[0037] Through the connection between the upper connecting rod, the step platform and the rear ladder frame, when the ladder is unfolded, the upper connecting rod automatically drives the step platform to rotate and unfold synchronously, reducing the steps for users to manually adjust the step, making the ladder more convenient and quick to put into use, and improving operational convenience and work efficiency.

[0038] The upper link connects the step platform to the rear ladder frame, providing additional support and further enhancing the overall stability of the ladder when deployed. The link's traction keeps the step platform firmly fixed to the ladder frame, preventing any shaking or instability during use and ensuring safety during operation.

[0039] With the assistance of the upper connecting rod, users can save effort and time when unfolding the ladder. At the same time, the upper connecting rod ensures the correct unfolding position of the pedals, avoids safety hazards caused by incorrect operation, and improves the overall user experience.

[0040] Furthermore, it also includes a lower connecting rod, one end of which is connected to the front ladder frame, and the other end of which is connected to the rear ladder frame.

[0041] The lower link connects the front and rear ladder frames, forming a stable support structure that further enhances the overall stability of the ladder when deployed. When the ladder is deployed, the lower link provides support between the front and rear ladder frames, effectively preventing them from shaking or deforming, ensuring the ladder's stability and safety during use.

[0042] The lower link acts as a limiter when the ladder is fully extended, preventing over-extension between the front and rear stiles, ensuring the ladder maintains its optimal design angle during use. This feature not only protects the ladder itself but also provides a safer user experience, avoiding the dangers of over-extension.

[0043] Furthermore, the connection between the front ladder frame tube and the pedal is locked by rivets, the connection between the rear ladder frame tube and the rung is locked by rivets, the connection between the front ladder frame, the rear ladder frame and the connecting ears is locked by rivets, the connection between the tool box and the front ladder frame is locked by rivets, the connection between the anti-slip foot cover, the front ladder frame tube and the rear ladder frame tube is locked by rivets, the connection between the upper connecting rod, the pedal platform and the rear ladder frame is locked by rivets, and the connection between the lower connecting rod, the front ladder frame and the rear ladder frame is locked by rivets.

[0044] Rivet connections are more aesthetically pleasing than bolts and screws. The rivet head is smooth, without protruding or sharp parts, protecting the user from accidental scratches or contact with sharp objects during operation. This not only improves the appearance of the ladder, but also enhances its safety and user comfort.

[0045] Rivet locking securely fastens the front and rear ladder frame tubes, treads, and rungs together to form a solid, integrated structure. Rivet connections offer exceptional shear and tensile strength, making the ladder more stable during load-bearing and use, reducing the risk of loosening and displacement, thereby enhancing the overall structural strength and safety.

[0046] Rivet locking is a permanent connection that resists loosening during use. Unlike screw connections, rivet locking ensures a tight connection even after extended use, reducing the potential safety hazards associated with loose screws. This significantly improves ladder safety, ensuring the ladder remains secure, especially during frequent use.

[0047] The beneficial effects of the utility model are as follows:

[0048] This new stepladder features an A-shaped structure, with the front and rear ladder frames securely connected by connecting lugs. This provides strong support and stability when the ladder is deployed, meeting ANSI standards for ladder stability and safety. Furthermore, a support tube is installed at the bottom of the step platform, tightly connected to the front and rear ladder frames, enhancing load-bearing capacity and ensuring safety and reliability, capable of passing high-standard load tests.

[0049] This new model features anti-skid foot covers installed at the lower ends of the front and rear ladder frame tubes, ensuring the ladder maintains excellent anti-skid performance in all operating environments. This design enables the ladder to pass ANSI's stringent anti-skid testing, ensuring safety under varying ground conditions.

[0050] This new design, with its C-shaped ladder frame tube design, enhances the ladder's strength and load-bearing capacity, ensuring it can withstand the high load tests required by ANSI standards. This design not only effectively improves the ladder's safety but also extends its service life.

[0051] This utility model adopts a staggered design at the connection between the tool box and the leg tube. The tool box is moved back a distance, which increases the available standing space on the top platform. This ensures that the user's body center of gravity does not shift backward during operation, further improving the safety of the operation. This design effectively prevents accidental falls caused by unstable center of gravity and is particularly suitable for working at height.

[0052] The C-shaped front and rear ladder frame tubes of this utility model save approximately 1 / 4 of the material compared to traditional rectangular frame tubes, significantly reducing manufacturing costs. While ensuring the strength and stability of the ladder, the lightweight design reduces unnecessary material usage, thereby improving cost-effectiveness.

[0053] In this utility model, all ladder components are connected using rivets, eliminating the use of sharp fasteners. This connection method not only reduces production costs and assembly difficulty, but also improves the aesthetics and safety of the product. The simplified process effectively reduces time and labor costs during the production process.

[0054] This utility model supports a variety of materials (iron, aluminum, plastic) and adopts a standardized design, which provides high interchangeability. Based on customer needs, materials can be flexibly selected to control costs or meet the needs of specific usage scenarios, further improving the product's market competitiveness and cost-effectiveness.

[0055] The upper and lower connecting rods in this utility model further enhance the overall stability of the ladder, making the entire ladder sturdy and durable even under high loads, while also increasing safety during operation. While improving strength, this design does not significantly increase material usage, maintaining the advantage of cost control. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a schematic diagram of the usage status of the large platform herringbone ladder.

[0057] Figure 2 This is a schematic diagram of the folded state of the large platform herringbone ladder.

[0058] Figure 3 This is an overhead view of the large platform herringbone ladder.

[0059] Figure 4 This is a cross-sectional view of the rear ladder frame tube.

[0060] Figure 5 This is a cross-sectional view of the front ladder frame tube. DETAILED DESCRIPTION

[0061] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0062] Example, combined with Figures 1 to 5 As shown, a large platform herringbone ladder comprises a front ladder frame 1, a rear ladder frame 2, connecting ears 3, a step platform 4, anti-slip foot covers 5 and a tool box 6. The front ladder frame 1 and the rear ladder frame 2 are connected together by the connecting ears 3, and the front ladder frame 1 and the rear ladder frame 2 can be expanded or retracted with each other;

[0063] The front portion of the step platform 4 is hinged to the front ladder frame 1, and the step platform 4 rotates around the hinge. The rear ladder frame 2 is provided with a rung. When the front ladder frame 1 and the rear ladder frame 2 are unfolded, the rear portion of the step platform 4 rests against the rung 22, so that the unfolded step ladder is in an "A" shape.

[0064] The front ladder frame 1 includes a front ladder frame tube 11, and the front ladder frame tube 11 is a "C"-shaped front ladder frame tube 11;

[0065] The rear ladder frame 2 includes a rear ladder frame tube 21, and the rear ladder frame tube 21 is a "C"-shaped rear ladder frame tube 21;

[0066] The anti-slip foot covers 5 are respectively arranged at the lower ends of the front ladder frame tube 11 and the rear ladder frame tube 21;

[0067] The tool box 6 is arranged on the top of the front ladder frame 1. The front of the tool box 6 corresponds to the front position of the step platform 4 and is provided with an opening 61 for the user to enter. The rear of the tool box 6 extends toward the rear ladder frame 2.

[0068] Furthermore, the front ladder frame 1 also includes pedals 12. The front ladder frame tubes 11 stand opposite to each other, and the distance between the front ladder frame tubes 11 gradually decreases from bottom to top. The pedals 12 are spaced apart between the front ladder frame tubes 11.

[0069] Furthermore, the rear ladder frame tubes 21 stand opposite to each other, and the distance between the rear ladder frame tubes 21 decreases gradually from bottom to top, and the rungs 22 are arranged at intervals between the rear ladder frame tubes 21 and the rear ladder frame tubes 21.

[0070] Furthermore, a support tube 7 is provided at the bottom of the step platform 4, and the step platform 4 and the support tube 7 are rotatably connected. Both ends of the support tube 7 extend out of the step platform 4 and are inserted into the front ladder frame tube 11 corresponding to the front ladder frame 1 to connect with the corresponding front ladder frame tube 11.

[0071] Furthermore, it also includes an upper connecting rod 8, one end of which is connected to the step platform 4, and the other end of which is connected to the rear ladder frame 2.

[0072] Furthermore, it also includes a lower connecting rod 9, one end of the lower connecting rod 9 is connected to the front ladder frame 1, and the other end of the lower connecting rod 9 is connected to the rear ladder frame 2.

[0073] Furthermore, the connection between the front ladder frame tube 11 and the pedal 12 is locked by a rivet 10, the connection between the rear ladder frame tube 21 and the tread 22 is locked by a rivet 10, the connection between the front ladder frame 1, the rear ladder frame 2 and the connecting ear 3 is locked by a rivet 10, the connection between the tool box 6 and the front ladder frame 1 is locked by a rivet 10, the connection between the anti-slip foot cover 5, the front ladder frame tube 11 and the rear ladder frame tube 21 is locked by a rivet 10, the connection between the upper connecting rod 8, the pedal platform 4 and the rear ladder frame 2 is locked by a rivet 10, and the connection between the lower connecting rod 9, the front ladder frame 1 and the rear ladder frame 2 is locked by a rivet 10.

[0074] Meets ANSI standards:

[0075] The entire ladder features an A-shaped structure, with the front and rear ladder frames 1 and 2 securely connected by connecting ears 3. This provides strong support and high stability when the ladder is deployed, meeting ANSI standards for ladder stability and safety. Furthermore, a support tube 7 is installed at the bottom of the step platform 4, tightly connected to the front and rear ladder frames 1 and 2, enhancing the load-bearing capacity and ensuring safety and reliability, capable of passing high-standard load tests.

[0076] Anti-slip foot covers 5 are installed at the lower ends of the front and rear ladder frame tubes 21 to ensure that the ladder has good anti-slip performance in various working environments. This design enables the ladder to pass the strict ANSI anti-slip testing for ladders, ensuring safety when used in different ground conditions.

[0077] The C-shaped ladder frame tube design enhances the ladder's strength and load-bearing capacity, ensuring it can withstand the high load tests required by ANSI standards. This design not only effectively improves the ladder's safety but also extends its service life.

[0078] Reduce costs and improve cost-effectiveness:

[0079] The C-shaped front and rear ladder frame tubes 11 and 21 save approximately one-quarter of the material used compared to traditional rectangular frame tubes, significantly reducing manufacturing costs. While maintaining the ladder's strength and stability, the lightweight design reduces unnecessary material usage, thereby improving cost-effectiveness.

[0080] All ladder components are connected using rivets 10, eliminating the need for sharp fasteners. This connection method not only reduces production costs and assembly difficulty, but also improves the product's aesthetics and safety. The simplified process effectively reduces time and labor costs during production.

[0081] The Pedal Platform 4 supports a variety of materials (iron, aluminum, and plastic) and utilizes a standardized design for high interchangeability. Based on customer needs, materials can be flexibly selected to control costs or meet the requirements of specific usage scenarios, further enhancing the product's market competitiveness and cost-effectiveness.

Claims

1. A large platform stepladder, comprising a front ladder frame, a rear ladder frame, connecting ears, a step platform, non-slip foot covers and a tool box, characterized by: The front ladder frame and the rear ladder frame are connected together by connecting ears, and the front ladder frame and the rear ladder frame can be expanded or retracted with each other; The front portion of the step platform is hinged to the front ladder frame, and the step platform rotates around the hinge. The rear ladder frame is provided with a step rod. When the front ladder frame and the rear ladder frame are unfolded, the rear portion of the step platform abuts against the step rod, so that the unfolded step ladder is in an "A" shape. The front ladder frame includes a front ladder frame tube, and the front ladder frame tube is a "C"-shaped front ladder frame tube; The rear ladder frame includes a rear ladder frame tube, and the rear ladder frame tube is a "C"-shaped rear ladder frame tube; The anti-slip foot covers are respectively arranged at the lower ends of the front ladder frame tube and the rear ladder frame tube; The tool box is arranged on the top of the front ladder frame. The front part of the tool box is provided with an opening for the user to enter at a front position corresponding to the front position of the step platform. The rear part of the tool box extends toward the rear ladder frame.

2. The large platform herringbone ladder according to claim 1, characterized in that: The front ladder frame also includes pedals. The front ladder frame tubes stand opposite to each other, and the distance between the front ladder frame tubes gradually decreases from bottom to top. The pedals are spaced between the front ladder frame tubes.

3. The large platform herringbone ladder according to claim 1, characterized in that: The rear ladder frame tubes are opposite to each other, and the distance between the rear ladder frame tubes gradually decreases from bottom to top. The treads are arranged at intervals between the rear ladder frame tubes.

4. The large platform herringbone ladder according to claim 1, characterized in that: A support tube is provided at the bottom of the pedal platform, and the pedal platform and the support tube are rotatably connected. Both ends of the support tube extend out of the pedal platform and are inserted into the corresponding front ladder frame tubes of the front ladder frame to connect with the corresponding front ladder frame tubes.

5. The large platform herringbone ladder according to claim 1, characterized in that: It also includes an upper connecting rod, one end of which is connected to the step platform, and the other end of which is connected to the rear ladder frame.

6. The large platform herringbone ladder according to claim 1, characterized in that: The utility model also comprises a lower connecting rod, one end of which is connected to the front ladder frame, and the other end of which is connected to the rear ladder frame.

7. The stepladder according to claim 1, characterized in that: The connection between the front ladder frame, the rear ladder frame and the connecting ears is locked by rivets, the connection between the tool box and the front ladder frame is locked by rivets, and the connection between the anti-slip foot cover, the front ladder frame tube and the rear ladder frame tube is locked by rivets.

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