Ergonomic Extendable Ladder Bracket and Locking Mechanism
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Solution Overview
Problem
Existing extendable/retractable ladders lack improved construction and handling features, particularly in mechanisms that facilitate easy assembly and efficient height adjustment.
Innovation Solution
The design incorporates telescoping columns with a bracket system that includes height indicators and a latch assembly with a locking pin and spring mechanism, allowing for easy extension and retraction, and a two-piece bracket design made from thermoplastic materials for enhanced assembly and fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch assembly with locking pin and spring mechanism is used, then the ladder provides secure locking in extended positions, but the mechanism complexity increases
Solution Approach 1:
The spring mechanism automatically engages the locking pin with the detent features on the telescoping columns without requiring manual intervention. The system self-locks when columns are extended and self-unlocks when manually released, reducing the need for complex control systems while maintaining reliable locking.
Solution Approach 2:
The locking pin acts as an intermediary element between the two telescoping columns, providing a simple mechanical connection that enables secure locking while keeping the overall mechanism relatively simple. The pin translates the expansion/contraction motion into discrete locked positions.
2Adaptability or versatility
If telescoping columns are used for extension and retraction, then the ladder can be adjusted to multiple heights, but the device complexity increases
Solution Approach 1:
The telescoping columns are nested within each other, with one column sliding inside the other to provide height adjustment. This nesting arrangement allows multiple height positions while maintaining a compact form when retracted, achieving versatility without excessive complexity.
Solution Approach 2:
The ladder structure transitions from a static fixed-height design to a dynamic adjustable-height design through the telescoping columns. The columns can expand and contract smoothly to provide multiple stable positions, enabling adaptability while using relatively simple mechanical components.
3Ease of manufacture
If a two-piece bracket design made from thermoplastic materials is used, then the assembly and fit are enhanced, but the manufacturing complexity increases
Solution Approach 1:
The bracket is divided into two separate pieces that can be manufactured independently using thermoplastic materials. This segmentation allows for easier manufacturing and assembly, as each piece can be produced separately and then joined, improving ease of manufacture while the modular nature reduces overall complexity.
Solution Approach 2:
The use of thermoplastic materials in the bracket design leverages the properties of composite or engineered plastics that provide both structural integrity and ease of assembly. These materials can be molded into complex shapes that simplify the overall assembly process while maintaining fit and function.
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
This solution provides improved handling and assembly of extendable/retractable ladders by allowing users to easily adjust the height and securely lock the columns, enhancing user safety and operational efficiency.
Implementation Method 1
a latch assembly with a locking pin and spring mechanism, allowing for easy extension and retraction
Data Source
Figure 1A~1E
Figure 2
Figure 3
AI summary
An extendable/retractable ladder assembly includes a first column and a second column, the first column nesting in the second column, and a first rung coupled to, and extending from the second column. A ladder assembly bracket includes a collar portion, which extends about the second column, and a rung portion, which extends from the collar portion into the first rung. The collar portion may be gripped by a hand of an operator in order to position a thumb of the hand in engagement with a button to retract a locking pin of a latch assembly mounted within the rung portion of the bracket.