Practice swim fin with perforations

Details Practice swim fin with perforations Practice swim fin with perforations

1997-02-25

1998-01-20

Swinehart, Ed L.

Buoys, rafts, and aquatic devices

Swimming aid to increase stroke efficiency

Foot attached

D21239, A63B 3108

Patent

active

057095752

ABSTRACT:
A practice molded rubbery swim fin has a foot retaining section with a heel and toe portion and a tapered blade section extending outward from the toe portion a distance of two to five inches. A number of apertures perforate the blade to reduce hydrodynamic resistance. Side stiffening ridges extend part way down the blade, leaving the distal end of the blade free to flex. This fin enables the swimmer to move fast enough to simulate the more vigorous kicking of racing without as much effort. The structure reduces stress on the swimmer in practice.

REFERENCES:
patent: 915457 (1909-03-01), Marrotte
patent: 2099973 (1937-11-01), De Corlieu
patent: 2588363 (1952-03-01), De Corlieu
patent: 2672629 (1954-03-01), La Trell
patent: 3422470 (1969-01-01), Mares
patent: 3908213 (1975-09-01), Hill
patent: 4627820 (1986-12-01), Penebre
patent: 4948385 (1990-08-01), Hull
patent: 5108328 (1992-04-01), Hull

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