Swim fin with hinged, spring-biased blade displaced from toe of foot pocket
US4767368A · kind A · utility
Inventor
Key dates
| Filing date | Oct 27, 1987 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | Oct 27, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B31/11
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A swim fin including a foot pocket has a rigid blade pivotally attached to a spring-biased strut assembly, one end of which is attached to the toe of the foot pocket, the other end of which is attached to the leading edge of the rigid blade. In one form the swim fins are provided as a pair, the blade of one having its trailing edges inclined, the leading edge of the blade of the other fin having leading edges inclined to accommodate the trailing edge of the other fin. The hinge point of one fin is located farther from the toe of the foot pocket than is the case for the other fin so that the swim fins can be used without their blades striking each other. The structure requires a minimum amount of energy for blade angle reversal during swimming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.