Adjustable fin

Abstract

An adjustable fin apparatus includes an elongated blade portion and elongated first and second frame members adapted for pivotal connection to the blade. An adjustment system for the first and second frame members rotates the pivotal connection of the frame members with respect to the blade. A thin web of a flexible polymeric material extends between the first frame member and the blade portion and between the second frame member and the blade portion.

1 . An adjustable fin apparatus, comprising:
 an elongated blade portion;   an elongated first frame member and an elongated second frame member adapted for pivotal connection to the blade;   an adjustment system for the first and second frame members to rotate the pivotal connection of the frame members with respect to the blade; and   a thin web of a flexible polymeric material, the web extending between the first frame member and the blade portion and between the second frame member and the blade portion.   
     
     
         2 . The apparatus of  claim 1  further comprising a shoe is removable attached to the blade portion. 
     
     
         3 . The apparatus of  claim 2  wherein the shoe is removably attached to the blade portion by one or more fasteners. 
     
     
         4 . The apparatus of  claim 2  wherein the shoe is removably attached to the blade portion by one or more straps. 
     
     
         5 . The apparatus of  claim 1  wherein the second frame member is pivotally connected to the blade portion at substantially the same location as the first frame member and wherein the second frame member substantially equal in length to the first frame member. 
     
     
         6 . The apparatus of  claim 1  wherein the adjustment system for the first and second frame members comprises at least one fastener connected to the frame members wherein rotation of the fastener pivotally moves the frame members. 
     
     
         7 . The apparatus of  claim 6  wherein the fastener is pivotally connected to the frame. 
     
     
         8 . The apparatus of  claim 1  wherein the pivotal connection of the first and second frame members to the blade portion allows the frame members to pivot from a fully closed position wherein the frame members and web are located within the blade portion to a fully open position wherein the frame members are located greater distance from one another and substantially outside the blade portion. 
     
     
         9 . The apparatus of  claim 8  wherein the adjustment system for the first and second frame members comprises at least one fastener connected to the frame members wherein rotation of the fastener pivotally moves the frame members. 
     
     
         10 . The apparatus of  claim 9  wherein the first and second frame members are pivotally connected to the blade at a location adjacent to the shoe attachment system. 
     
     
         11 . An adjustable fin apparatus, comprising:
 an elongated blade portion formed of a polymeric material, the blade including a shoe portion;   an elongated first frame member and an elongated second frame member adapted for pivotal connection to the blade portion;   an adjustment system for the first and second frame members to regulate the pivoting connection of the frame members with respect to the blade portion; and   a thin web of a flexible polymeric material, the web extending between the first frame member and the blade and between the second frame member and the blade.   
     
     
         12 . The apparatus of  claim 11  wherein the shoe portion comprises a foot pocket and ankle strap. 
     
     
         13 . The apparatus of  claim 11  wherein the pivotal connection of the first and second frame members to the blade portion is at a location substantially close to the shoe portion. 
     
     
         14 . The apparatus of  claim 11  wherein the second frame member is pivotally connected to the blade at substantially the same location as the first frame member and wherein the second frame member substantially equal in length to the first frame member. 
     
     
         15 . The apparatus of  claim 11  wherein the adjustment system for the first and second frame members comprises a fastener connected to the frame member wherein rotation of the fastener pivotally moves the frame member. 
     
     
         16 . The apparatus of  claim 11  wherein the pivotal connection of the first and second frame members to the blade portion allows the frame members to pivot from a fully closed position wherein the frame members and web are located within the blade portion to a fully open position wherein the frame members and web are exterior to the blade portion. 
     
     
         17 . The apparatus of  claim 15  wherein the fastener is pivotally connected to the frame. 
     
     
         18 . The apparatus of  claim 16  wherein the adjustment system for the first and second frame members comprises a fastener connected to the frame member wherein rotation of the fastener pivotally moves the frame member. 
     
     
         19 . The apparatus of  claim 18  wherein the first and second frame members are pivotally connected to the blade portion at a location substantially close to the shoe attachment system.