Ladder Leveler With Integrated Locking and Centering Mechanism
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Solution Overview
Problem
Existing ladder levelers are complex, costly, and heavy, with a high number of components, which complicates assembly and reduces reliability and design flexibility while not adequately addressing stability and safety on uneven ground surfaces.
Innovation Solution
A ladder leveler system with extendable legs that include a transverse rod for simultaneous extension and retraction control, a locking mechanism for securing the legs when both are on the ground, and a return-to-center mechanism for centering the legs when lifted, utilizing a combination of racks, pinions, and springs to simplify the design and enhance functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ladder levelers are used, then stability and safety on uneven ground are improved, but device complexity and weight increase
Solution Approach 1:
The patent combines multiple functions (leveling, locking, and centering) into a single integrated leveler assembly that attaches to the ladder rungs. The leveler assembly merges the extendable legs, transverse rod, locking mechanism, and return-to-center spring into one unified structure, reducing the total number of separate components while maintaining all necessary functions for stability and safety on uneven ground.
Solution Approach 2:
The leveler assembly is designed as a multi-functional device that simultaneously provides leveling control through extendable legs, locking capability through the pawl mechanism, and return-to-center functionality through the spring. This universal design allows a single assembly to perform multiple functions that would traditionally require separate devices, thereby reducing overall complexity.
2Reliability
If traditional ladder levelers are used, then stability and safety on uneven ground are improved, but weight increases
Solution Approach 1:
By merging the leveling legs, locking mechanism, and return-to-center spring into a single integrated leveler assembly, the patent reduces the cumulative weight that would result from using separate components. The unified structure eliminates redundant materials and reduces overall mass while maintaining the necessary stability and safety functions.
3Reliability
If traditional ladder levelers are used, then stability is improved, but assembly and maintenance difficulty increases
Solution Approach 1:
The leveler assembly is segmented into distinct functional modules: extendable legs with rungs, a locking mechanism with pawl and detent, and a return-to-center spring. This segmentation allows for simplified assembly where each module can be independently manufactured and then quickly assembled, and facilitates maintenance by allowing individual components to be easily accessed, inspected, or replaced without disassembling the entire structure.
Solution Approach 2:
The leveler assembly incorporates a self-locking mechanism where the pawl automatically engages with the detent when the extendable legs are extended, providing automatic locking without requiring additional assembly steps. The return-to-center spring automatically returns the legs to their initial position when released, providing self-service functionality that simplifies both assembly and maintenance operations.
4Reliability
If traditional ladder levelers are used, then stability is improved, but cost of components and assembly increases
Solution Approach 1:
The patent reduces the total number of separate components that need to be manufactured, purchased, and assembled. By integrating multiple functions into a single leveler assembly, the patent eliminates the need for multiple separate parts, thereby reducing material costs, manufacturing expenses, and assembly labor costs while maintaining the stability and safety functions.
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 solution reduces the complexity and weight of the leveler system, improves stability and safety by ensuring the ladder remains level on uneven surfaces, and simplifies assembly and maintenance, while maintaining design flexibility and reducing costs.
Implementation Method 1
a bottom one of the legs is biasingly moved toward the ladder
Data Source
AI summary
A ladder includes a leveler engages a bottom of each side rail for 1) causing extendable legs to move to a level ground-engaging position, 2) causing the legs to lock when both legs engage the ground, and 3) causing the extendable legs to move to a centered/retracted position when lifted from the ground. The leveler includes pawls, links, pinions, and a shaft forming a four-bar linkage for selectively moving the pawls inward to the disengaged position when the pinion and shaft are each freely rotatable, but selectively moving the pawl outward into locking engagement when the shaft resists movement due to ground engagement by both legs. The leveler can be constructed to attach to an inside of the side rails, thus facilitating pre-assembly.