1979-06-11
1981-02-17
Blix, Trygve M.
9309, A63B 3100
Patent
active
042505844
ABSTRACT:
A collapsable swim fin includes a frame, a nonrigid blade or propulsion web, and tension members pivotally connected to the frame. The frame includes two slender, semirigid members extending forwardly from a swimmer's foot. The tensioning members include a pair of tension bars, each of which connect at one end to an opposite side of the frame members. The bars are pivotally interconnected at their other end, allowing movement of the bar members in a plane parallel with the blade. The blade or propulsion web is made of a collapsable material. Rotating the bars toward each other moves the frame members together and collapses the blade. Positioning the bars slightly past a colinear disposition to an overcenter orientation pushes the frame members apart, which tensions the blade material. The overcenter orientation causes the resilience of the propulsion webbing, in conjunction with a locking pin arrangement on the bars, to maintain the bars in a position to tension the propulsion webbing. The frame members attach to a swimmer's foot by a pair of straps which encircle the heel and the middle portion of the swimmer's foot, and by a pocket formed on the blade and enclosing encloses the forward portion of the swimmer's foot. The blade, in its collapsed form, is very compact and light and thus easily transportable.
REFERENCES:
patent: 2207923 (1940-07-01), Kelso
patent: 2903719 (1959-09-01), Wozencraft
patent: 2980926 (1961-04-01), Wolshin
patent: 3037219 (1962-06-01), Webb
patent: 3665535 (1972-05-01), Picken
Blix Trygve M.
Keen D. W.
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