Foldable Step Stool Lock Mechanism to Prevent Accidental Collapse
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foldable step stools lack a reliable mechanism to securely lock the steps in place when transitioning from the collapsed storage mode to the expanded use mode, leading to instability and potential accidents.
Innovation Solution
A fold-blocking lock mechanism, specifically a step-retainer lock with a pivotable crossbar latch and latch base, is coupled to the metal top step of the foldable step stool, engaging with the step-support crossbar to stabilize the frame when opened, ensuring the step remains stationary and secure without damaging the step panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fold-blocking lock mechanism is added to secure the steps in place, then the stability and safety of the step stool is improved, but the device complexity increases
Solution Approach 1:
The lock mechanism is designed to automatically engage and disengage based on the frame's configuration. When the frame transitions between collapsed and expanded states, the lock automatically secures itself without requiring user intervention, thereby improving reliability while minimizing operational complexity
Solution Approach 2:
The lock mechanism incorporates movable components that dynamically adapt to the frame's position. The lock engages automatically when the frame is in the expanded configuration and disengages when collapsed, providing stability when needed without adding permanent complexity to the structure
2Ease of manufacture
If the lock mechanism is coupled to the step panel directly, then the ease of manufacture is improved, but the step panel may be damaged or blemished
Solution Approach 1:
The latch base serves as an intermediary component between the lock mechanism and the step panel. It provides a mounting surface for the lock components while distributing forces away from the step panel, preventing direct attachment that would cause damage or visible blemishes to the finished surface
Solution Approach 2:
The lock assembly is segmented into multiple components: the latch base that interfaces with the step structure, the crossbar latch that provides the locking function, and mounting brackets that distribute attachment points. This segmentation allows the lock to be coupled to the step assembly without directly attaching to the step panel surface
Data Source
AI summary
A foldable step stool includes an expandable step frame, steps pivotably coupled to the expandable step frame, and a fold-blocking lock coupled to one of the steps. The fold-blocking lock is operable to block pivotable movement of the steps relative to the expandable step frame when once foldable step stool has been opened.