Buoys – rafts – and aquatic devices – Swimming aid to increase stroke efficiency – Foot attached
441 55, 441 61, A63B 3100
A flipper-type swimming propulsion aid assembly for attachment to the feet of a swimmer to increase the swimmer's effective foot area. The swimming aid for each foot includes a collapsible frame of generally isosceles triangular configuration having side frame members of substantially equal length which are pivotally joined through a heel plate at the heel end of the frame and a foldable cross frame member joining the free or toe ends of the side frame members. The swimming aid also includes a fabric or plastic sheet web component which is placed over the collapsed frame assembly and thereater the side frame members are separated with the cross frame member opened and extended. The web component is provided with a flap portion at its toe end and such portion is positioned to surround and maintain the cross frame member in its extended orientation and thereby stretch the triangular web component over the assembled frame so that when the swimming propulsion aids are affixed to the swimmer's feet the effective propulsion area of the sole are of each foot is increased by at least double that of the sole per se. Foot and ankle straps are provided for affixing the swimming aid assemblies to the swimmer's feet.
patent: 1607857 (1926-11-01), Zukal
patent: 2672629 (1954-03-01), Trell
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patent: 4250584 (1981-02-01), Korn
patent: 4599071 (1986-07-01), Juang
Bartz Clifford T.
Junkins Philip D.
Peters Jr. Joseph F.
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