Closed shoe swim fin
US5356323A · kind A · utility
Inventor
Key dates
| Filing date | May 21, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | May 21, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B31/11
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A closed shoe swim fin which has a planar trapezoidal shaped flexible base (20) with a pair of symmetrical upwardly curved tips (26). An enlarged bulbous foot retainer (32) is integrally located on the base at the rear portion. The retainer has a rearward opening (34) and an inside cavity (36) larger than the size of the foot of a swimmer allowing flexing of the users foot. A strap (42) with a stiffening sleeve (46) and buckle (48) hold the foot into the swim fin. The base is planar in the middle and tapers toward the outside edge. The tips are flexible enough that they are responsive to a force urged against the upper surface, causing an arcuate shaped path curling away from the foot retainer creating a build-up of water pressure within the flexed surface, subsequently when the direction of travel is reversed a snapping action takes place producing a propelling force through the water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.