Folding Ladder Assembly with Linkage Mechanisms for Compact Retraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing machines with elevated platforms face challenges in safely and efficiently retracting ladders or stairs for access, particularly in mobile machines, as current systems often require manual operation or multiple operators and can collide with obstructions, necessitating a solution for safe and single-operator controlled retraction.
Innovation Solution
A folding ladder assembly with linkage assemblies, including a first, second, and third linkage assembly, and a retractable railing assembly using a four-bar linkage mechanism, allowing the ladder and railing to be moved between extended and retracted positions with an actuating linkage member, enabling single-operator operation and automatic movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the ladder and railing are made retractable to reduce machine profile and prevent collisions, then the machine's transport width is reduced and collision risk is minimized, but the complexity of the retraction mechanism increases
Solution Approach 1:
The ladder sections are designed to nest within each other during retraction, with the second ladder section folding against the first ladder section, and the railing nesting within the ladder structure. This nesting arrangement minimizes the overall volume and profile of the retracted components while maintaining structural integrity.
Solution Approach 2:
The ladder and railing are designed with dynamic, movable joints and linkage assemblies that allow the structure to transition between extended and retracted configurations. The linkage assemblies enable smooth mechanical transformation while maintaining stability in both positions, reducing the need for complex locking mechanisms.
2Device complexity
If manual operation is used for ladder retraction, then the device complexity is reduced, but the ease of operation deteriorates and multiple operators may be required
Solution Approach 1:
The linkage assembly is designed to automatically coordinate the movement of multiple ladder sections and the railing during retraction. When one section is moved, the mechanical linkages automatically drive the other sections through their respective motion paths, eliminating the need for multiple operators to manually position each component.
3Volume of moving object
If the ladder is designed to fold against the platform for retraction, then the profile is minimized, but the reliability of the folding mechanism may be compromised
Solution Approach 1:
The ladder is divided into multiple independent sections (first ladder section, second ladder section) that can move relative to each other through separate but coordinated linkage assemblies. This segmentation allows each section to be optimized for its specific motion while maintaining overall structural reliability through the interconnected linkage system.
Data Source
AI summary
Folding ladder assembly includes upper and lower ladder sections, and first, second, and third linkage assemblies. First linkage assembly includes at least a first linkage assembly linkage member. Second linkage assembly includes at least a second linkage assembly first linkage member pivotably coupled to upper and lower ladder sections. Third linkage assembly includes at least portions of the first linkage assembly linkage member and the second linkage assembly first linkage member. Movement of the first linkage assembly results in movement of the upper ladder section, the second linkage assembly, the third linkage assembly, and the lower ladder section.