Buoys – rafts – and aquatic devices – Swimming aid to increase stroke efficiency – Foot attached
Reexamination Certificate
2007-10-16
2007-10-16
Swinehart, Ed (Department: 3617)
Buoys, rafts, and aquatic devices
Swimming aid to increase stroke efficiency
Foot attached
Reexamination Certificate
active
11642462
ABSTRACT:
An energy-conserving swim fin, in which a blade extends from a front portion of a foot pocket of a swim fin, and at least one spring is fitted at an appropriate position on the blade. The springs are structured such that support is provided when force is inwardly applied to two ends and extensibility when force is outwardly applied, and behavior of these two different force coefficients are brought about in a two-stroke alternate flapping motion during the course of manipulating the present invention, wherein, when kicking the water to push forward, the support provided by the springs enables the blade to form an angle against the water to achieve a propulsion effect, and during a restoring motion of the swim fin, extensibility provided by the springs enables the blade to form an angle that does not resist the water, thereby achieving effectiveness to conserve energy and rapidly return to original state, and thus assisting the swimmer in conserving physical strength and increasing staying power. Moreover, occurrence of foot cramp in the swimmer is reduced, especially when there is the need to speed up the alternate flapping motion to counteract adverse currents, when function of the present invention becomes apparent.
REFERENCES:
patent: 4767368 (1988-08-01), Ciccotelli
patent: 4944703 (1990-07-01), Mosier
Pro-Techtor Int'l Services
Swinehart Ed
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