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    • 4. 发明授权
    • Positive drive swim fin
    • 正驱动游泳
    • US4923419A
    • 1990-05-08
    • US180544
    • 1988-04-12
    • Kevin I. McCarthy
    • Kevin I. McCarthy
    • A63B31/11
    • A63B31/11
    • The specification herein shows a swimmer's fin having a foot pocket and a blade portion wherein the blade portion is offset from the foot pocket to compensate for the natural supination during a flutter kick, stroke or beat, regardless of whether or not it is a backstroke, kick, or a crawl stroke kick. The fin can be molded in a symmetrical manner so that it can be interchanged between the feet and provided with an offset ankle strap in order to create a more comfortable relationship during the swimming movement. The fin also includes an improved blade end having inner and outer curves wherein the outer curve from the body is of a larger radius than the inner curve. The offset of the foot pocket from the blade can be such wherein the axis of the blade and the axis of the foot pocket intersect within the foot pocket area to provide for improved performance.
    • 本文的说明书示出了具有足部口袋和刀片部分的游泳者鳍片,其中刀片部分从脚袋偏移以补偿在颤振踢,踢或跳动期间的自然仰卧,而不管其是否是仰泳, 踢或踢中风踢。 鳍可以以对称的方式模制,使得它可以在脚之间互换并且设置有偏移踝带,以便在游泳运动期间产生更舒适的关系。 翅片还包括具有内部和外部曲线的改进的叶片端部,其中来自主体的外部曲线具有比内部曲线更大的半径。 脚袋与刀片的偏移可以是这样的,其中刀片的轴线和脚口的轴线在脚袋区域内相交以提供改进的性能。