High efficiency hydrofoil and swim fin designs
US6482059B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Feb 1, 2001 |
| Grant date | Nov 19, 2002 |
| Priority date | — |
| Expiry date | Feb 1, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2281/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Methods are disclosed for increasing lift and decreasing turbulence and drag on hydrofoils and swim fins. Fins are disclosed having at least one pivoting blade region connected to the swim fin with a flexible joint element made from reduced blade thickness, blade cutout regions, and injection molding of the flexible material of the foot pocket. Methods are also provided for limiting the deflections of at least one pivoting blade region with a movable blade limiting member connected to both the pivoting blade region and a blade limiting load bearing member with a chemical bond created during molding. Methods are disclosed for orienting at least one pivoting blade region at a reduced angle of attack sufficient for increased efficiency and reduced effort. Injection molding assembly methods with chemical bonds and mechanical bonds are provided. Fins having transverse flexible elements, transverse recesses, longitudinal recesses and venting systems are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.