Integrated Pad Eye Fairlead Device for Marine Rigging
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Solution Overview
Problem
Existing rigging systems on sailing vessels are complex and cumbersome due to the need for multiple pulleys and pad eyes to manage line redirection and tension, especially in areas like the jib sheet control where multi-degree of freedom adjustments are required.
Innovation Solution
A compact deck pad eye and fairlead device that functions as both an attachment point for lines and a fairlead passage, providing isolated regions to prevent line wear and friction, and allowing for multiple attachment points and fairlead passages for advanced rigging configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional pulleys and multiple pad eyes are used for line redirection and tension management, then the rigging system can achieve multi-degree of freedom adjustments, but the device complexity and weight increase significantly
Solution Approach 1:
The patent combines the pad eye (attachment point) and fairlead (line redirection device) into a single integrated unit. This merging eliminates the need for separate pulleys and multiple attachment points, reducing overall system complexity while maintaining the ability to redirect lines at various angles and provide multi-degree of freedom adjustments for sail control
Solution Approach 2:
The combined pad eye and fairlead device performs multiple functions simultaneously: it serves as an attachment point for securing lines (pad eye function) and as a line redirection device (fairlead function). This multi-functionality allows a single device to replace what previously required multiple specialized components, simplifying the rigging system while preserving adaptability
2Device complexity
If conventional pulleys are replaced with static fairleads to reduce complexity, then the device complexity decreases, but friction losses increase and limit the range of turning angles
Solution Approach 1:
By merging the pad eye and fairlead functions into one device, the patent creates a optimized flow path where the line attachment and redirection occur in a coordinated manner. This integration allows for larger turning angles (90 degrees or greater) to be achieved without excessive friction losses, overcoming the limitation of static fairleads while avoiding the complexity of conventional pulley systems
3Adaptability or versatility
If multiple separate devices (pad eye and fairlead) are used in the same location, then both attachment and line redirection functions are achieved, but the device complexity and space requirements increase
Solution Approach 1:
The patent merges the pad eye and fairlead into a single integrated device that occupies minimal deck space. This consolidation allows both attachment and line redirection functions to be performed in the same location without requiring multiple separate devices, thereby reducing the overall area occupied on the vessel deck while maintaining full dual-function capability
Data Source
AI summary
A device is presented that can be used as both a pad eye and as a fairlead independently and simultaneously while providing separation between the two modes of use. The device provides the option for multiple attachment points and multiple fairlead passages and reduces the need of requiring both a pad eye and additional hardware such as a pulley in applications such as the implementing of a jib sheet “in-hauler” system on a sailing vessel. Additionally, the device is configured in a symmetric manner so as to allow the device to be optionally joined and mated to a second but inverted such device allowing for the assembly of two such devices into a single combined unit. Such a combined configuration has the benefit of allowing for pad eye and fairlead functions to take place in a suspended location instead of being constrained to only a fixed surface.