Fish Hook Convex Facets Reduce Penetration Energy
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Solution Overview
Problem
Conical fish hooks require significant energy to penetrate a fish's mouth due to the need to stretch and puncture the membrane, while faceted points are weak and prone to bending or breaking due to material loss during the grinding process.
Innovation Solution
A fish hook with multiple convex facets, which provides a stronger point with more material at the tip and multiple cutting edges, formed by varying radii and lengths to enhance durability and penetration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conical point is used, then the point can penetrate the fish's mouth, but a significant amount of energy is required
Solution Approach 1:
The point is divided into multiple facets (typically three) instead of a single conical surface. Each facet creates a cutting edge that acts independently to slice through the membrane, distributing the penetration force across multiple edges rather than relying on a single conical point to stretch and puncture the membrane all at once.
Solution Approach 2:
The facets are formed with specific curvature radii (R1 and R2) that create optimized cutting edges. The curved surfaces of the facets allow for progressive engagement with the membrane, enabling the point to slice through tissue more efficiently than a sharp conical point, thereby reducing the energy required for penetration.
2Use of energy by moving object
If faceted surfaces are ground to reduce penetration energy, then cutting edges are provided, but the point becomes weak and prone to bending or breaking
Solution Approach 1:
Different regions of the point have different facet configurations optimized for their specific functions. The cutting edges at the tip are formed with specific curvature radii for penetration efficiency, while the body of the point maintains sufficient material thickness and structural integrity. This local differentiation allows the point to be both sharp/efficient at the tip and strong along its length.
Solution Approach 2:
The invention specifies precise parameter ranges for facet curvature radii (R1 from 0.05mm to 0.5mm, R2 from 0.5mm to 5mm) and facet angles to optimize the balance between cutting efficiency and structural strength. By controlling these geometric parameters, the point achieves optimal performance with reduced material removal compared to traditional grinding methods.
3Use of energy by moving object
If faceted surfaces are ground, then cutting edges are created, but material is lost leaving little material at the apex
Solution Approach 1:
The facet geometry is pre-designed with specific curvature radii and angles before the grinding process begins. This preliminary design ensures that the grinding process removes minimal material while still creating effective cutting edges. The pre-planned geometric parameters guide the manufacturing process to preserve maximum material at the apex and along the point body.
Solution Approach 2:
The use of curved facet surfaces with optimized radii (R1 and R2) allows for more efficient material removal patterns during grinding. The curvature enables the creation of functional cutting edges with less material loss compared to flat or concave facets, as the curved surfaces naturally distribute stress and require less aggressive grinding to achieve the desired edge geometry.
Data Source
AI summary
A fish hook with multiple convex facets is provided. Each facet may have a length that is some multiple of the diameter of the hook body. In addition, each convex facet has a radius of curvature that is some multiple of the diameter of the wire. Each facet may alternatively be formed from first and second convex surfaces, having first and second curvatures.