Firefighting Ladder Assembly With Flexible Hydraulic Coupling
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Solution Overview
Problem
Existing extendable ladder assemblies for rescue vehicles, particularly firefighting vehicles, face challenges in using rigid water tubes due to their rigidity, which restricts the movement of the terminal portion, limiting the flexibility and effectiveness of the ladder system.
Innovation Solution
A ladder assembly with telescopically arranged segments and a hydraulic equipment system that includes flexible elements and a length compensator, allowing the terminal portion to move and compensate for length variations while maintaining the rigidity of the water tubes, enabling the ladder to extend and incline for effective use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid water tubes are used in the ladder assembly, then structural integrity and firefighting functionality are improved, but the terminal portion cannot move freely
Solution Approach 1:
The water supply system is divided into multiple rigid segments that are telescopically arranged within the ladder segments. Each rigid tube segment is carried by a corresponding ladder segment, allowing the system to maintain rigidity where needed while accommodating terminal movement through the telescopic arrangement of segments.
Solution Approach 2:
The solution moves the flexibility requirement from the horizontal plane (terminal portion movement) to the longitudinal dimension (telescopic extension of ladder segments). By allowing the ladder segments to extend and retract telescopically, the system accommodates terminal portion movement without compromising the rigidity of the water tubes.
2Length of moving object
If the ladder assembly is made extendable with multiple segments, then reach capability is improved, but the complexity of the water pipe system increases
Solution Approach 1:
The water supply system is segmented and integrated with the ladder segments. Each ladder segment carries a corresponding rigid tube segment, so that the number of pipe components matches the number of ladder segments. This segmentation approach allows the ladder to extend to various lengths while keeping the pipe system manageable and organized.
Solution Approach 2:
The rigid tube segments serve multiple functions: they provide structural support for the water supply system, maintain rigidity for effective firefighting operations, and are integrated with the telescopic ladder segments to accommodate length variations. This multi-functionality reduces the need for additional components.
3Ease of operation
If the terminal portion is made movable for better positioning, then operational flexibility is improved, but rigid water tubes prevent such movement
Solution Approach 1:
The system transitions from a static rigid structure to a dynamic telescopic arrangement. The rigid water tube segments are carried by telescopic ladder segments, allowing the terminal portion to move to different positions as the ladder extends or retracts. The rigidity of the tubes is maintained within each segment while the overall system becomes adaptable through the telescopic mechanism.
Data Source
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AI summary
Ladder assembly (5) for a rescue vehicle, said ladder assembly (5) comprising a plurality of segments (5a, 5b, 5c, 5d, 5e) carried one within the other in a telescopic manner, actuator means configured to allow retraction or extraction of ladder assembly (5) between a minimum and a maximum length and a hydraulic equipment (10) provided with a plurality of rigid segments (10a, 10b, 10c, 10d, 10e) each associated to a respective segments (5a, 5b, 5c, 5d, 5e), the first segment (5a) of the ladder assembly (5) comprising a terminal portion (5a') and a main portion (5a"), the first segment (10a) of the hydraulic equipment (10) comprising a first portion (10a') and a second portion (10a") respectively carried by terminal and main portions (5a', 5a"), the first portion (10a') being connected to the second portion (10a") via a flexible element (11).