Buoys – rafts – and aquatic devices – Swimming aid to increase stroke efficiency – Foot attached
Patent
1997-02-25
1998-09-29
Basinger, Sherman
Buoys, rafts, and aquatic devices
Swimming aid to increase stroke efficiency
Foot attached
A63B 3111
Patent
active
058138897
ABSTRACT:
An expandable swim flipper includes a blade having at least an expandable portion thereof. The expandable portion radially expands in response to water resistance directed to a first surface of the blade. The surface area of the flipper is correspondingly increased to propel a swimmer at a faster rate through the water. The expandable portion radially contracts in response to water resistance directed to a second surface of the blade. The surface area of the flipper is correspondingly reduced, and is thereby subject to decreased water resistance. In a first preferred embodiment of the invention, the flipper blade is formed of expandable lateral members joined to a central member having a constant width. In a second, equally preferred embodiment, the flipper blade is formed of lateral members having a constant width and joined to an expandable central member. In a third, equally preferred embodiment of the invention, the flipper blade is expandable over its entire width. Rigid axial supports, or vertical flexors may be provided to supply additional structural support to the swim flipper.
REFERENCES:
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patent: 5536190 (1996-07-01), Althen
Muller Peter H.
Perry Alan
Basinger Sherman
Glenn Michael A.
Hendricks Donald M.
Perry Alan
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