Wire Rope Barrier Hanger With Dual-Axis Rotation
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Solution Overview
Problem
Existing wire rope barriers face challenges in efficiently releasing cables from posts during impact, leading to difficulties in vehicle redirection, increased debris, and complex installation processes, while also being costly and prone to premature failure.
Innovation Solution
A wire rope barrier design utilizing hangers with two legs of different axes of rotation, allowing for controlled and repeatable release of cables from posts upon impact, minimizing parts and debris, and simplifying installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wire rope barriers use simple cable-post connections, then installation is simple, but the cables cannot be controlled to release at predetermined impact levels
Solution Approach 1:
The hanger mechanism transitions from a static connection to a dynamic one that automatically responds to impact forces. The cable hanger includes a post engagement portion that rotates about a pivot point, allowing it to dynamically engage and disengage from the post based on the magnitude of applied forces during vehicle impact.
Solution Approach 2:
The system changes the release force parameter by designing the hanger geometry and pivot point location. The predetermined force level for cable release is determined by the mechanical parameters of the hanger (arm length, pivot position, engagement geometry), allowing controlled release at specific impact thresholds without complex electronics or adjustment mechanisms.
2Strength
If wire rope barriers use multiple components for secure cable attachment, then cable retention is strong, but installation becomes complex and time-consuming
Solution Approach 1:
The hanger merges multiple functions into a single integrated component: cable support, post engagement, rotational movement, and force-sensing release. This consolidation maintains strong cable retention while simplifying installation compared to systems requiring multiple separate parts and assembly steps.
Solution Approach 2:
The hanger mechanism is self-regulating and self-releasing. When impact force exceeds the predetermined threshold, the hanger automatically rotates and disengages from the post without requiring external intervention, sensors, or control systems. The cable is retained during normal conditions but releases automatically when needed.
3Reliability
If wire rope barriers are designed to release cables during impact, then vehicle redirection is improved, but debris is generated from released components
Solution Approach 1:
The hanger is designed as a sacrificial component that is replaced after impact rather than repaired. This disposable approach eliminates the need for complex repair procedures and ensures consistent performance, as each hanger is manufactured to precise specifications that guarantee predictable release characteristics.
Solution Approach 2:
The release mechanism extracts only the necessary function (cable detachment) from the system while leaving the post and cable intact. The hanger arm is designed to rotate and disengage cleanly from the post, and the cable simply drops away from the cable support, minimizing fragmented debris compared to systems where posts or cables break during release.
4Adaptability or versatility
If wire rope barriers use adjustable cable height systems, then adaptability to different applications is improved, but device complexity and installation time increase
Solution Approach 1:
The post is segmented with multiple engagement positions or slots at different heights, allowing the hanger to be installed at various cable heights by selecting different engagement points. This segmentation provides adjustability without requiring complex mechanical adjustment mechanisms, as the hanger simply engages with the post at the desired height position during installation.
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 design effectively redirects vehicles, reduces debris, and simplifies installation by minimizing parts, ensuring predictable failure modes and easy reassembly, while maintaining cable tension and preventing accidental release.
Implementation Method 1
wherein, when a predetermined impact force is imposed on the barrier, at least one hanger releases a retained cable when at least one leg or a part thereof deforms allowing the cable holding portion to in turn release the cable
Data Source
AI summary
In the above embodiment, the second leg distal end may be shaped to directly enter the slot, the distal end being aligned in a direction parallel and offset relative to the longitudinal cable axis. Also in the above embodiment, the first leg distal end may be shaped as an inverted U-shaped hook, the U-shaped hook being perpendicular and offset relative to the longitudinal cable axis and at least part of the post wall beneath the slot fits within the U-shaped hook once the hanger reaches the final seated position. The end shapes noted above are provided by way of example only and should not be seen as limiting.