Foldable Two-Step Stool with Linkage Mechanism for Compact Storage
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Solution Overview
Problem
Conventional two-step step stools are bulky due to non-foldable designs, leading to high transportation costs and cumbersome movement, and existing foldable models suffer from structural instability, narrow surfaces, and poor comfort.
Innovation Solution
A two-step step stool with a primary and secondary stool, connected by a linkage mechanism allowing synchronous folding and unfolding, featuring a middle plate and connecting rods with a locking mechanism for stability and a yielding slot to prevent interference, along with anti-skid pads for enhanced support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional two-step step stools are made non-foldable for simplicity, then manufacturing is easier, but packaging size increases and transportation cost rises
Solution Approach 1:
The step stool is divided into multiple independent components: primary stool body, secondary stool body, connecting rods, and linkage mechanisms. Each component can be manufactured separately and assembled through hinge connections, enabling both ease of manufacturing individual parts and foldability of the complete structure for compact packaging
Solution Approach 2:
The step stool incorporates hinge joints and linkage mechanisms that transform the structure from a static rigid form to a dynamic foldable system. The connecting rods and linkages enable the stool to transition between extended and folded states, reducing packaging volume while maintaining manufacturing simplicity through standardized hinge components
2Ease of operation
If foldable two-step step stools use full hinge connection for mobility, then ease of operation improves, but structural stability deteriorates causing swinging
Solution Approach 1:
The linkage mechanism uses asymmetric connecting rod arrangements where rods of different lengths and positions create a mechanically locked configuration. This asymmetric design prevents unintended swinging while maintaining foldability, as the linkage geometry itself provides stability rather than relying on symmetric hinge connections alone
Solution Approach 2:
The linkage mechanism dynamically adjusts the structural configuration: when folded, the connecting rods align to provide stability; when extended, the same linkage provides mobility. The dynamic interplay between the linkage components creates automatic stabilization without compromising ease of operation
3Ease of manufacture
If the stool surface is made narrow to reduce material, then manufacturing cost decreases, but comfort level deteriorates
Solution Approach 1:
The step stool design extends the stool surface area by utilizing the lateral dimension through the width of the primary and secondary stool bodies. Rather than increasing surface area solely in the vertical dimension, the design spreads the support surface horizontally across both stool levels, providing comfortable foot placement without excessive material consumption in any single dimension
Data Source
AI summary
A two-step step stool includes a primary stool and a secondary stool. The primary stool includes a primary supporting plate and a primary pedal hinged with a top of the primary supporting plate. The secondary stool includes a secondary supporting plate and a secondary pedal hinged with a top of the secondary supporting plate. The secondary pedal is higher than the primary pedal. A middle plate is arranged between the primary stool and the secondary stool and is respectively hinged with the primary pedal and the secondary pedal. A linkage mechanism capable of folding the primary stool and the secondary stool synchronously is further arranged between the primary stool and the secondary stool. The two-step step stool can be drawn close towards the middle plate when being folded by hinging the primary pedal with the middle plate and hinging the secondary pedal with the middle plate.