Adjustable Ladder Mechanisms for Uneven-Surface Stability
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Solution Overview
Problem
Conventional ladders, particularly extension ladders, are heavy and difficult to maneuver due to their rigidity requirements for stability, and they often lack sufficient safety and stability on uneven or slippery surfaces.
Innovation Solution
A ladder design featuring a slidable coupling between the fly section and base section with bearing members and adjustable legs, along with a mechanism for securing the ladder to surfaces, enhancing stability and adjustability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If extension ladders are made rigid to withstand bending and twisting under user weight, then structural strength is improved, but weight and bulk increase making them difficult to maneuver
Solution Approach 1:
The ladder is divided into multiple sections (base section and fly section) that can be separated and reconfigured. The rungs are segmented into individual components that can be independently positioned and locked, allowing the ladder to maintain strength when needed while reducing weight for maneuverability.
Solution Approach 2:
The ladder transitions from a static rigid structure to a dynamic reconfigurable system. The rungs can be moved between locked and unlocked positions, and the ladder can be disassembled into sections, enabling it to adapt its structural properties based on operational needs versus transportation needs.
2Device complexity
If conventional ladder feet are used on slippery or uneven surfaces, then simplicity is maintained, but stability and safety are compromised
Solution Approach 1:
The foot mechanism automatically adjusts to surface conditions without requiring manual intervention. The adjustable leg mechanism self-regulates to extend or retract based on the ground surface, providing stability on uneven terrain and preventing sinking into soft surfaces automatically.
Solution Approach 2:
The foot parameters (length, angle, contact surface area) are made variable rather than fixed. The adjustable legs can change their extension length and angle to adapt to different surface conditions, while the spreader bars can adjust the lateral distance between feet to optimize stability for various ladder configurations.
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 provides improved maneuverability, stability, and safety on various surfaces by allowing for adjustable length and secure footing, reducing weight and bulk while maintaining structural integrity.
Implementation Method 1
the bearing member having a body portion disposed within a recess of the first rail and an elongated L-slot formed within the body portion, the elongated L-slot matingly and slidingly engaging a first rail of the second pair of rails
Data Source
AI summary
Ladders and ladder components are provided including feet for ladders configured for securement of the ladder to a supporting surface, adjustable leg members for ladders, bearing members for ladders, and adjustment mechanisms for ladders. In one embodiment, an adjustment mechanism may include a first pair of spaced apart rails, a pair of adjustable legs having a first end hingedly coupled to one of a pair of adjustment mechanisms and a second end coupled with a foot. The adjustment mechanisms may be slidably coupled with the rails and in one embodiment, each adjustment mechanism is selectively displaceable along a length of its associated rail only when upward force is absent from the adjustment mechanism, the upward force being defined in a direction from a lower end of the associated rail towards the adjustment mechanism.