Buoys – rafts – and aquatic devices – Swimming aid to increase stroke efficiency – Foot attached
Patent
1995-10-23
1997-07-08
Basinger, Sherman
Buoys, rafts, and aquatic devices
Swimming aid to increase stroke efficiency
Foot attached
441 63, A63B 3111
Patent
active
056454600
ABSTRACT:
A retractable fin assembly is disclosed for attachment to the boot of a float tube user. The assembly includes a fin member movable between a fast position projecting below the boot adapted for propelling the float tube user forwardly in the water and a second position adapted for retraction relative to the heel of the boot to permit walking on land by the float tube user. Propulsion vanes are carried by the fin member and have a closed position for providing substantial resistance to the flow of water as the fin member is moved in rearward direction relative to the user. The vanes also have an open position for providing substantially reduced resistance to the flow of water as the fin member is moved in forward direction relative to the user. Finally, a mechanism is provided for attaching the fin member to the boot of a user so that the fin member first position aligns the propulsion vanes at a pre-selected angle of approximately 90.degree. or more between the propulsion vanes and a horizontal plane defined by the boot sole as the fin member projects downwardly from and behind the heel of the boot, and the second position aligns the fin member behind the heel and the leg of the user above the horizontal plane defined by the boot sole.
REFERENCES:
patent: 2343965 (1944-03-01), Fisch
patent: 3081467 (1963-03-01), Ciccotelli
patent: 3084355 (1963-04-01), Ciccotelli
patent: 3268927 (1966-08-01), Markowitz
Basinger Sherman
Isaac John L.
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