Retractable Fin Box With Spring Bias For Impact Protection
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Solution Overview
Problem
Existing watercraft fins are prone to breaking upon impact with external forces, leading to costly repairs and potential water damage, and existing retractable fin solutions are not universally compatible with various types of watercraft boards.
Innovation Solution
A self-contained retractable fin system comprising a fin box and spring mechanism that can fit both hard and inflatable boards, allowing the fin to retract upon impact and instantly snap back into place, providing a universal solution for diverse watercraft types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fins are made retractable to reduce damage upon impact, then reliability is improved, but device complexity increases
Solution Approach 1:
The fin is nested within the fin box, allowing it to retract inside the housing when not in use and extend when needed. This nesting approach protects the fin from damage while maintaining a compact structure without requiring complex external mechanisms.
Solution Approach 2:
The fin transitions from a static, fixed position to a dynamic, movable position within the fin box. This dynamic capability allows the fin to retract upon impact or during transport, improving durability while the spring mechanism provides automatic restoration to the extended position.
2Ease of operation
If fins are made retractable to enable easier transport by stacking boards, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The fin nests within the fin box housing, creating a compact configuration that eliminates protruding parts during transport. This allows boards to be stacked closely together without fin obstruction, improving transport convenience with minimal added complexity.
3Adaptability or versatility
If a universal fin system is designed to fit various watercraft types, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The fin box is designed with universal dimensions and mounting features that can accommodate various watercraft types including surfboards, SUPs, and kayaks. The standardized design allows the same fin box assembly to be used across different board types, improving adaptability while maintaining feasible manufacturing tolerances.
Solution Approach 2:
The fin system is segmented into separate components (fin, fin box, mounting hardware) that can be independently manufactured and then assembled. This segmentation allows for standardized fin boxes with precise dimensions while maintaining flexibility in adapting to different watercraft types through various mounting configurations.
4Reliability
If fins are made retractable using spring mechanism, then reliability is improved, but use of energy increases
Solution Approach 1:
The spring mechanism is pre-loaded to store potential energy that cushions against impact forces before they reach the fin. This beforehand cushioning protects the fin from damage by absorbing impact energy, improving reliability while the spring's elastic properties allow it to return to its original state without permanent energy loss.
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 retractable fin system reduces the risk of damage, enables safe navigation through shallow waters, facilitates easier transport by allowing boards to be stacked without fin obstruction, and maintains functionality as a standalone component compatible with multiple watercraft types.
Implementation Method 1
A bias (e.g., spring or other resilient member) enables the retractable fin to at least partly, if not fully, retract into the fin box
Implementation Method 2
A bias (e.g., spring or other resilient member) enables the retractable fin to at least partly, if not fully, retract into the fin box
Data Source
AI summary
A retractable fin system having a retractable fin and fin box is disclosed. An example retractable fin system includes a housing insertable into an opening in a watercraft board. The example retractable fin system also includes a retractable fin. The example retractable fin system also includes a bias to maintain the retractable fin in a default outward position from the housing. The bias retracts the retractable fin into the housing on contact with an outside force.