Fender hook
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Solution Overview
Problem
Existing fender hooks fail to securely mount nautical lines to a vessel, especially in wet conditions due to low coefficient of friction, leading to inadvertent displacement and potential damage to the vessel hull.
Innovation Solution
A fender hook design featuring a non-marking base material with a high coefficient of friction gripping material, such as 3M Gripping Material, and a one-way biased cleat that engages the nautical line, ensuring secure attachment to a railing regardless of dry or wet conditions, with a coefficient of friction greater than 3.0 according to ASTMD-1984.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fender hooks with low friction materials (plastic, metal, fabric) are used, then the device complexity is low and ease of manufacture is high, but the coefficient of friction is insufficient especially in wet conditions, leading to fender displacement
Solution Approach 1:
The patent applies composite materials by combining a base material (plastic, metal, or fabric) with a gripping material layer having high coefficient of friction (greater than 3.0). This composite structure integrates the structural properties of the base material with the frictional properties of the gripping material, resolving the contradiction between device simplicity and fender security in wet conditions
Solution Approach 2:
The patent applies local quality by adding gripping material only to the specific contact surfaces that require high friction (the portions contacting the fender and railing), while maintaining the simplicity of the base structure. This localized application of high-friction material provides reliable fender security without requiring the entire device to be complex
2Reliability
If traditional mounting methods are used, then the ease of operation is high, but the coefficient of friction decreases when wet, causing the fender to become displaceable
Solution Approach 1:
The patent applies parameter changes by modifying the coefficient of friction parameter of the mounting surface through the application of gripping material. The gripping material maintains a coefficient of friction greater than 3.0 even when wet, fundamentally changing the friction parameter from insufficient (traditional materials) to sufficient (gripping material), thereby ensuring mounting security without complicating installation
3Reliability
If high friction gripping material is added to the base material, then the coefficient of friction exceeds 3.0 in wet conditions, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies composite materials by layering gripping material over a conventional base material. This approach allows manufacturers to use standard base materials (plastic, metal, or fabric) that are easy to manufacture, and simply add the gripping material layer to achieve the required coefficient of friction greater than 3.0, thus maintaining ease of manufacture while improving grip reliability
Solution Approach 2:
The patent applies local quality by applying gripping material only to specific surfaces where friction is needed, rather than requiring the entire device to be made of high-friction material. This localized approach reduces manufacturing complexity while achieving the necessary grip coefficient for reliable fender mounting in wet conditions
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 fender hook effectively maintains fenders in place on a vessel, preventing displacement and damage, even in wet conditions, by providing a secure grip with a coefficient of friction greater than 3.0, ensuring the fender remains attached and protected.
Implementation Method 1
a length of gripping material... exhibiting a coefficient of frictional greater than 3.0... The gripping material... provides a secure grip
Data Source
AI summary
A fender hook is disclosed that is formed by a base material carrying a gripping material disposed between sections of hook and loop material. By wrapping the base material over upon itself, the gripping material is brought into frictional engagement with a mounting substrate such as a nautical railing and is held in place by the hook and loop material.