Adjustable Stepladder Locks and Cross-Braced Spreaders for Stability
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Solution Overview
Problem
Existing ladders often pose challenges in terms of ease of use, stability, and safety, particularly when adjusting height, storing tools, and maintaining structural stability during use.
Innovation Solution
The proposed solution involves a ladder design with adjustable rail configurations, including locking mechanisms with levers and engagement pins, tray and platform configurations, and a spreader mechanism with cross-bracing for enhanced stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If locking members are actuated by lateral displacement outward from side rails, then the ladder height can be adjusted, but the operation becomes awkward and difficult requiring significant effort
Solution Approach 1:
Instead of displacing the locking member outward from the side rail to engage/disengage, the invention inverts the mechanism so that the locking member is displaced inward toward the side rail. The cam surface converts this inward linear motion into rotational motion of the locking member, making actuation easier and more intuitive for the user.
Solution Approach 2:
The cam surface acts as an intermediary between the user's linear pushing motion and the rotational locking mechanism. By introducing this intermediate element, the difficult lateral displacement action is transformed into an easier inward pushing action that naturally rotates the locking member through the cam geometry.
2Volume of moving object
If spreaders are hinged or collapsing to allow compact storage, then the ladder can be stored efficiently, but finger or hand pinching can occur during collapse
Solution Approach 1:
The hazardous hinge mechanism is completely extracted and removed from the spreader design. Instead of using a hinge that creates pinching zones, the invention uses a telescoping mechanism with interlocking rails that collapse without any pinching points, eliminating the harmful factor while maintaining compact storage capability.
Solution Approach 2:
The invention converts the potential harm of collapse into a beneficial feature by designing the spreader to collapse in a controlled manner where the rails slide into each other. The interlocking mechanism ensures that during collapse, the structure actually enhances stability rather than creating pinching hazards, turning a potentially dangerous operation into a safe one.
3Ease of manufacture
If minimal structure is used in spreaders, then manufacturing is simpler, but structural stability and prevention of ladder walk is reduced
Solution Approach 1:
The spreader uses a composite structure combining multiple functional elements within the telescoping rails: structural support sections, locking features, adjustment mechanisms, and stabilization components. This composite approach provides enhanced stability and prevents ladder walk while still maintaining manufacturing simplicity through modular construction.
Data Source
AI summary
Ladders, ladder components and related methods are provided. In some embodiments, adjustable stepladders are provided which include locking mechanisms that enable height adjustment of the ladder through application of a force towards the rails of the ladder. In other embodiments, spreader mechanisms are provided with cross bracing located and configured to provide additional stability to the ladder while also incorporating a handle that enables efficient collapsing of the ladder while reducing the potential of pinching ones hands or fingers. In another embodiment, a device is provided for selective coupling with the ladder that includes a support or safety rail and an adjustable tray. The device may be coupled with the ladder in a number of different positions including a stowed position. In another embodiment, a hinge assembly is provided having a magnetic component configured to be magnetically coupled with and temporarily store an object on the ladder.