Swim fin

Details Swim fin Swim fin

1993-02-08

1994-04-19

Basinger, Sherman

Buoys, rafts, and aquatic devices

Swimming aid to increase stroke efficiency

Foot attached

A63B 3111

Patent

active

053040813

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.

REFERENCES:
patent: 5163859 (1992-11-01), Beltrani

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