James B Picken

US Patent:

49349716, Jun 19, 1990

Filed:

Oct 31, 1988

Appl. No.:

7/265398

Inventors:

James B. Picken - Spokane WA

International Classification:

A63B 3108

US Classification:

441 64

Abstract:

A swim fin includes a shoe assembly for attachment to the individual feet of the user, an outwardly projecting rigid support frame, a pivoted web, and a strap or band for yieldably limiting the extent of pivotal movement of the web relative to the supporting frame about a transverse pivotal axis. The web has a plan configuration that includes a substantially straight transverse trailing edge and a leading edge in the shape of a swept-back ellipse. Longitudinal sections across the web have proportional sectional configurations and a constant maximum thickness to length ratio between the upper and lower web surfaces.