Mast-head rigging connection with roller bearings
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Solution Overview
Problem
Existing mast-head standing rigging connection devices do not adequately support rectangular or triangular fore-aft sail configurations, particularly lacking general angled or angled-to-deck forestay, backstay, and shroud connections.
Innovation Solution
A mast-head standing rigging connection device design that includes connection lugs for two or more shrouds, forestay, and backstay, with beams determined by sail geometry and vertical angles, allowing rotation of sail assemblies and incorporating roller- and ball-bearings for reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mast-head standing rigging connection devices are used, then simple triangular mainsail configurations are supported, but general standing rigging connection capabilities for rectangular or triangular fore-aft sail configurations are not provided
Solution Approach 1:
The connection device is designed with multiple connection lugs (first lug for forestay, second lug for backstay, third and fourth lugs for shrouds) that can accommodate various rigging configurations including both triangular mainsails and rectangular or triangular fore-aft sails, making the device universal for different sail types
2Loss of energy
If friction reduction mechanisms are added to the rotatable mast system, then rotational friction is minimized, but device complexity increases
Solution Approach 1:
The patent replaces traditional sliding friction contacts with rolling element bearings (roller bearings and ball bearings) in the rotatable mast system, substituting high-friction mechanical contact with low-friction rolling motion, thereby minimizing frictional torque during rotation
3Adaptability or versatility
If multiple connection lugs for shrouds, forestay, and backstay are provided, then general rigging connection capabilities are achieved, but device complexity increases
Solution Approach 1:
The connection device is segmented into multiple independent connection lugs (first lug for forestay, second lug for backstay, third and fourth lugs for shrouds), each positioned to receive specific rigging lines, allowing the device to handle complex rigging configurations through modular connection points
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 device accommodates complex standing rigging layouts, minimizes frictional torque, and supports a wide range of sail configurations, including multi-mast and multi-sail systems, enhancing stability and operational efficiency.
Implementation Method 1
Frictional torque, induced by rotation of sail assembly or reef-furl system, is minimized due to inclusion of roller- and ball-bearings in design
Implementation Method 2
Frictional torque, induced by rotation of sail assembly or reef-furl system, is minimized due to inclusion of roller- and ball-bearings in design
Data Source
AI summary
One embodiment of a mast-head standing rigging connection device, allowing for sail module rotation about a mast axis, is disclosed. The embodiment allows for connection of shrouds and conventional single mast forestay and backstay rigging systems. Additional embodiments, utilizing modifications of the first embodiment, for multi-mast and triangular fore-aft sail mast roller reef-furl systems, are described.