Ladder Leveling Assembly with Step Lever Lock
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Solution Overview
Problem
Existing ladders often require the use of blocks and shims to stabilize on uneven surfaces, posing safety risks and necessitating extended reaches to maintain balance, while also failing to meet industry safety standards for ladder positioning.
Innovation Solution
A ladder leveling and stabilizing assembly featuring a first arcuate tube with a second arcuate tube slidably disposed within, a lock subassembly, and a step lever that allows for hands-free locking by stepping on a lower step member, ensuring secure positioning on uneven surfaces and meeting safety requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If blocks and shims are used to stabilize the ladder on uneven surfaces, then the ladder can be positioned on sloped or rough surfaces, but the ladder may shift suddenly causing safety hazards and the user must extend their reach far from the ladder
Solution Approach 1:
The patent employs dynamic adjustment mechanisms including a telescoping second arcuate tube that can slide within the first arcuate tube, allowing the ladder feet to adapt to uneven surfaces. The lock subassembly with step lever provides dynamic locking capability that secures the tubes at desired positions, combining adaptability with stability through mechanically locked positions rather than static fixed structures.
Solution Approach 2:
The ladder stabilization system is divided into separate functional components: first and second arcuate tubes for positioning, a lock subassembly for securing, and a step lever for operation. This segmentation allows each component to perform its specific function efficiently - the tubes provide adjustment range, the lock subassembly provides secure positioning, and the step lever provides easy operation without requiring hands.
2Reliability
If a lock subassembly is added to secure the second arcuate tube, then the ladder stability improves, but the device complexity increases
Solution Approach 1:
The lock subassembly is designed to be operated by the user's foot through the step lever, making the locking action part of the normal climbing process rather than a separate manual operation. The system serves itself by integrating the locking mechanism into the structural components - the step lever is part of the ladder structure, and the lock subassembly uses the natural motion of stepping to activate the locking action.
3Reliability
If the lock subassembly requires manual operation, then the locking mechanism can be precisely controlled, but the ease of operation decreases as users must use their hands instead of simply stepping on the ladder
Solution Approach 1:
The lock subassembly is designed to be operated by the user's foot through the step lever, making the locking action part of the normal climbing process rather than a separate manual operation. The system serves itself by integrating the locking mechanism into the structural components - the step lever is part of the ladder structure, and the lock subassembly uses the natural motion of stepping to activate the locking action.
Solution Approach 2:
The locking action is performed automatically as the user begins to climb the ladder by stepping on the step lever, before the user needs to concern themselves with ladder stability. This preliminary locking action ensures the ladder is secured before the user puts full weight on it, combining convenience with reliability.
4Reliability
If the lowest step is positioned to meet safety requirements, then the ladder complies with industry standards, but the ease of operation decreases as users cannot easily reach the step lever
Solution Approach 1:
The lock subassembly is designed to be operated by the user's foot through the step lever, making the locking action part of the normal climbing process rather than a separate manual operation. The system serves itself by integrating the locking mechanism into the structural components - the step lever is part of the ladder structure, and the lock subassembly uses the natural motion of stepping to activate the locking action.
Data Source
AI summary
The assembly includes a first arcuate tube attached to a ladder. A second arcuate tube is slidably disposed in the first arcuate tube. A lock subassembly is disposed on the first arcuate tube for limiting movement of the second arcuate tube relative to the first arcuate tube. A step lever extends along the first arcuate tube and is coupled with the lock subassembly. A first flange and a second flange each extend radially from the first arcuate tube. An actuating member defines a cam surface abutting the second flange. A bar extends through the flanges and attaches to the actuating member. The step lever attaches to the actuating member to move the actuating member and cause the cam surface to slightly deform the first arcuate tube about the second arcuate tube and engage the second arcuate tube. A foot is pivotably disposed at each end of the second arcuate tube.