Collapsible Ladder with Rotatable Steps and Top Caps
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Solution Overview
Problem
Conventional ladders that fold do not effectively collapse their steps and top caps, leading to inefficient storage and potential instability, as they often require complex mechanisms or do not securely hold the position when erected.
Innovation Solution
A collapsible ladder design featuring rotatable siderails, steps, top caps, and spreaders with a spreader lock and gear system that allows for secure erection and efficient folding by sliding components along grooves, ensuring all parts can be neatly collapsed for storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional folding ladder designs are used, then the rails can be collapsed, but the steps and top caps cannot be effectively collapsed leading to inefficient storage
Solution Approach 1:
The ladder is divided into modular segments including siderails, steps, spreaders, and top caps, each capable of independent rotation and collapse. The steps are segmented to rotate individually, and top caps are separated to fold back, enabling complete collapse of all components for compact storage.
Solution Approach 2:
The ladder employs dynamic rotatable joints at critical connection points including step-to-rail interfaces, spreader-to-rail connections, and top cap-to-siderail attachments. These dynamic joints allow the structure to transition between extended and collapsed states, with each component able to rotate into a compact configuration.
2Volume of moving object
If the ladder structure is made collapsible for storage, then storage efficiency improves, but stability and security during use may be compromised
Solution Approach 1:
The spreader lock mechanism prevents accidental collapse by locking the spreaders in their extended position during ladder use. This preliminary anti-action counteracts any forces that might cause unintended folding, ensuring stability while allowing easy manual release when collapsing is desired.
Solution Approach 2:
The rotatable joints and hinge connections are pre-configured to maintain rigid structural relationships when the ladder is extended. The geometry of the spreaders and their attachment points is designed to create inherent structural stability before use, ensuring the ladder stands firm when deployed.
3Volume of moving object
If all components including top caps are made rotatable for complete collapse, then storage efficiency improves, but the mechanism complexity increases
Solution Approach 1:
The top caps are merged with the siderail structure through rotatable connections that allow them to fold back along the rails. This integration eliminates the need for separate top cap storage mechanisms, as they collapse into place within the overall ladder structure, reducing total component count.
Solution Approach 2:
The rotatable joint mechanism serves multiple functions: it connects steps to rails, connects spreaders to rails, and connects top caps to siderails. This universal joint design provides consistent rotational capability across all components without requiring different mechanisms for each part, simplifying the overall system.
Data Source
AI summary
A collapsible ladder that collapse not only the rails but also the steps, as well as the top caps, so that the ladder may be erected and then collapsed flat, saving storage space. The ladder has a pair of right siderails rotatably connected to a pair of left siderails. The right top cap and the right steps are rotatably attached in between the pair of right siderails. The right top cap and the right steps are also rotatably attached in between the pair of right linking rails. Likewise, the ladder also has a pair of left siderails rotatably connected to a pair of left siderails. The left top cap and the left steps are rotatably attached in between the pair of left siderails. The left top cap and the left steps are also rotatably attached in between the pair of left linking rails. Because the siderails, the steps, the linking rails are all rotatably attached to form the ladder, the ladder may be open and erected and also may be folded and collapsed to save space for storage and for carrying.