Rescue Ladder Cable Routing for Independent Pivoting
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Solution Overview
Problem
Existing turntable ladders for rescue vehicles are limited in their ability to pivot the end part independently of the other ladder parts, requiring all mobile ladder parts to be extended to a certain length before pivoting is possible, which restricts their use and results in complex, heavy, and cost-intensive designs.
Innovation Solution
The extension cable is routed through individual roller pairs in the connecting parts, allowing the end part to be extended independently, with a braking system ensuring that only the end part moves initially, enabling free pivoting without extending the other ladder parts, and subsequent connecting parts are extended sequentially using tensile force and locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all mobile ladder parts are extended to a certain length before pivoting, then pivoting becomes possible, but the ladder set becomes complex, heavy, and cost-intensive
Solution Approach 1:
The cable guidance system is segmented into multiple independent cable paths, with each connecting part having its own roller pair. This allows independent control of each ladder section's extension, enabling the end part to be extended for pivoting without requiring all other parts to be extended, thus reducing structural complexity while maintaining pivoting capability
Solution Approach 2:
The system transitions from a static configuration where all parts must be extended to a dynamic configuration where individual parts can be extended independently. The roller pairs and cable arrangement enable dynamic control of each section, allowing the end part to be positioned for pivoting while other parts remain retracted
2Adaptability or versatility
If all mobile ladder parts are extended to a certain length before pivoting, then pivoting becomes possible, but the ladder set becomes heavy
Solution Approach 1:
By segmenting the cable guidance system into independent paths with individual roller pairs for each connecting part, the system allows only the necessary end part to be extended for pivoting operations. This eliminates the need to extend and support unnecessary ladder sections, thereby reducing the overall weight of the moving ladder set while maintaining full pivoting capability
3Stability of the object's composition
If coupling cables are used to force synchronized movement, then all ladder parts extend together, but the end part cannot be pivoted until all parts are fully extended
Solution Approach 1:
The cable guidance system is divided into separate cable paths, each with its own roller pair associated with a specific connecting part. This segmentation allows the end part to be extended independently through its dedicated cable path, enabling pivoting operations without requiring synchronized extension of all ladder parts, thus providing independent pivoting capability while maintaining stable composition when needed
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 design allows for independent extension of the end part and smooth transition of ladder part movements, enabling pivoting without extending the entire ladder set, reducing complexity and weight while maintaining functionality.
Implementation Method 1
The extension cable is attached at one end to the end part and, on its way to the deflecting roller in the base part, is guided over the individual roller pairs consecutively
Implementation Method 2
a braking system ensuring that only the end part moves initially, enabling free pivoting without extending the other ladder parts
Data Source
AI summary
A ladder set for rescue vehicles, including a base mounted on a vehicle, an end part and connecting parts disposed therebetween. A traction device is mounted for an extension cable and a roller arrangement for guiding the cable. Roller pairs are mounted on connecting parts, of which each include a front roller and a rear roller. A deflecting roller is located on the end of base part pointing in the direction of extension, via which extension cable is guided in the direction of the traction device. Extension cable is secured to end part by its end opposite traction device and is guided from fixation point to deflecting roller then via roller pairs of connecting parts in their connecting order, in such a way that extension cable first passes the first and then the rear rollers of a roller pair.