Foldable Step Stool Handrail Adjustment Mechanism
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Solution Overview
Problem
Conventional foldable step stools lack a convenient mechanism for adjusting the handrail's position, making it difficult to switch between storage and use modes efficiently, and often require manual manipulation to secure the handrail in place.
Innovation Solution
A foldable step stool design featuring a handrail with spring-biased locking bolts and a handrail-release unit that allows for up-and-down movement, enabling easy transition between lowered and raised positions, and a C-shaped handle-support arm for sliding movement on the step frame, facilitating secure retention in both modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handrail is fixed in a fixed position on conventional step stools, then the structure is simple and stable, but the user cannot adjust the handrail position to switch between storage and use modes efficiently
Solution Approach 1:
The handrail is transformed from a fixed structure to a movable one, allowing it to slide between lowered and raised positions. The handle-support arms are designed to slide along the front legs, enabling dynamic position adjustment. This is complemented by spring-biased locking bolts that automatically lock the handrail in either position, resolving the contradiction between ease of operation and device complexity.
Solution Approach 2:
The spring-biased locking bolts provide automatic locking functionality without requiring manual intervention. When the handrail reaches either the lowered or raised position, the springs automatically engage the locking bolts to secure the position. This self-service mechanism reduces operational complexity while maintaining ease of position adjustment.
2Ease of operation
If manual manipulation is required to secure the handrail in place, then the locking mechanism is simple, but the operation becomes difficult and time-consuming
Solution Approach 1:
The spring-biased locking bolts automatically engage with the front legs when the handrail is in either the lowered or raised position, securing the handrail without requiring manual manipulation. The springs provide the necessary force to push the locking bolts into engagement, creating a self-service locking system that improves ease of operation while maintaining appropriate automation level.
3Productivity
If the step frame is made foldable for ease of storage, then storage efficiency is improved, but the structural stability during use may be compromised
Solution Approach 1:
The step frame incorporates foldable legs that can transition between extended (stable) and collapsed (storage) configurations. The linkage mechanisms allow the frame to maintain structural stability when legs are extended for use, while enabling easy folding for storage. This dynamic design resolves the contradiction between storage efficiency and structural stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances user convenience by allowing effortless adjustment of the handrail between storage and use positions, ensuring secure retention in both modes without the need for manual locking, thus improving usability and storage efficiency.
Implementation Method 1
spring-biased locking bolts
Data Source
AI summary
A step stool includes a step frame including a plurality of legs and a handrail coupled to the step frame. The step frame is foldable so as to assume a flat profile for storage. The handrail is mounted on the step frame and is movable relative to the step frame. The handrail provides support for a user standing on the step frame.