Expandable Step Stool Tray Linkage for Object Stability
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Solution Overview
Problem
Conventional step stools with tray assemblies often face challenges in maintaining the orientation of objects during the transition from a collapsed to an expanded position, leading to potential displacement of items.
Innovation Solution
The implementation of an expandable tray assembly with a tray-motion controller linkage that guides the movable tray panel between collapsed and expanded positions, ensuring the top surface remains upwardly facing, utilizing forward and rear links to maintain object stability during transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the tray assembly is made expandable to increase storage capacity, then the area of the tray is improved, but the stability of objects during transition deteriorates
Solution Approach 1:
The tray assembly transitions from a static structure to a dynamic one, allowing it to expand and collapse while maintaining object stability through controlled motion. The movable tray panel can change position between expanded and collapsed states while the linkage system ensures objects remain stable throughout the transition.
Solution Approach 2:
The tray-motion controller linkage acts as an intermediary mechanism between the movable tray panel and the fixed tray unit. It controls and guides the movement of the tray panel, ensuring that objects remain stable during transition by maintaining proper orientation and preventing displacement.
2Adaptability or versatility
If a movable tray panel is added to expand storage capacity, then the adaptability of the tray assembly is improved, but the device complexity increases
Solution Approach 1:
The tray assembly is segmented into a fixed tray unit and a movable tray panel that can independently move between positions. This segmentation allows the tray to adapt between expanded and collapsed configurations while keeping the overall structure manageable through modular components.
Solution Approach 2:
The tray assembly serves multiple functions: it provides storage in both expanded and collapsed states, maintains object stability during transition, and offers flexible configuration options. The same mechanism supports various tray positions and orientations, making the system versatile without requiring multiple separate components.
Data Source
AI summary
A step stool includes an expandable tray assembly. The expandable tray assembly has a fixed tray panel and a movable tray panel coupled to the fixed tray unit for movement relative to the fixed tray unit. The movable tray panel is illustratively movable between a collapsed position, arranged above the fixed tray panel, and an expanded position, arranged adjacent to the fixed tray panel.