Swim fin
US5304081A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1993 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Feb 8, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B31/11
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
Swimmer's downkick causes a swim fin to be incurved transversely thereof to generate a powerful propulsive force. The swim fin 1 comprises a foot pocket 2 and a propulsion blade 3 which is, in turn, provided at the transverse middle and between this transverse middle and respective side rails 6, 6 with a groove 15 and grooves 16, 16, respectively, wherein each of these grooves 15, 16, 16 is curved convexly from the topside toward the underside of the propulsion blade 3 and extends from a forward end of the propulsion blade 3 toward the foot pocket 2. The swim fin 1 is integrally molded from a hard type elastic material 40 and a soft type elastic material 30, wherein opposite side edges 10, 10 of the propulsion blade 3 are formed from the hard type elastic material 40 and a zone defined between these side edges 10, 10 is formed from the soft type elastic material 30.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.