Swim flipper

Abstract

A swimming fin with a foot part (1, 3, 4) attachable to a swimmer's foot and a swimming fin vane (2) attachable to the foot part (1, 3, 4) is described. The swimming fin vane (2) comprises an elongated holder (5) and at least two streamlined blades (7, 7i, 8, 8i) arranged protruding laterally from the holder (5) and rotatably arranged in both directions by a predefined angle. According to a first object of the invention, the swimming fin is characterized by a movable arrangement of the elongated holder (5) relative to the foot part (1, 3, 4) attachable to the swimmer's foot. According to an alternative or additional second object of the invention, the swimming fin is characterized in that the streamlined blades (7, 7i, 8, 8i) protruding on opposite sides in relation to the longitudinal axis (9) of the holder (5) are interconnected via a plate-shaped crossbar (46). The plate-shaped crossbar (46) runs through a hole (45, 45i) in the elongated holder (5). The hole (45, 45i) in the elongated holder (5) is equipped with blade movement limiters (47, 48) in the form of protrusions and has a larger size than the crossbar (46) passing through it.

1 . Swim fin, comprising:
 a foot part attachable to the foot of a swimmer; and   fin vane attachable to the foot part, comprising an elongated holder and at least two streamlined blades extending laterally from the holder and rotatable in both directions by a predetermined angle, featuring a movable arrangement of the elongated holder relative to the foot part attachable to the swimmer's foot, characterized in that the elasticity of the elongated holder is higher in a vertical plane than in a horizontal plane arranged perpendicular to this vertical plane, standing normal on the vertical plan spanned by the streamlined blades and enclosing the longitudinal axis of the holder.   
     
     
         2 . Swim fin according to  claim 1 , wherein a joint is arranged between the elongated holder and the foot part. 
     
     
         3 . Swim fin according to  claim 2 , wherein the joint is provided with at least one return spring and the holder is designed to be elastically deformable. 
     
     
         4 . Swim fin according to  claim 2 , wherein the joint is provided with at least one return spring and the holder is designed to be rigid. 
     
     
         5 . Swim fin according to  claim 1 , wherein the elongated holder rotates and/or bends relative to the foot part attachable to the swimmer's foot during fin stroke movements. 
     
     
         6 . (canceled) 
     
     
         7 . Swim fin according to  claim 1 , wherein the elongated holder has ribs, holes, water-filled or water-free inner cavities that serve to adjust the elasticity of the holder in the vertical and horizontal plane. 
     
     
         8 . Swim fin according to  claim 1 , wherein the elongated holder of the fin vane is at least partially composed of modules with streamlined blades. 
     
     
         9 . Swim fin according to  claim 1 , wherein the foot part attachable to the swimmer's foot comprises a sole with reinforcement, to which the elongated holder of the fin vane is attached. 
     
     
         10 . Swim fin according to a  claim 1 , wherein the elongated holder is provided on at least one side with at least one projection that limits the rotation of the streamlined blades. 
     
     
         11 . Swim fin according to  claim 1 , wherein the blades extend on both sides of the elongated holder. 
     
     
         12 . Swim fin according to  claim 11 , wherein the blades extending on opposite sides relative to the longitudinal axis of the holder are rotatably mounted around a common axis in the elongated holder. 
     
     
         13 . Swim fin according to  claim 1 , wherein the streamlined blades extending on opposite sides relative to the longitudinal axis of the holder are connected via a plate-shaped crosspiece that runs through a hole in the elongated holder, while the hole in the elongated holder is equipped with blade movement limiters in the form of projections and has a larger size than the crosspiece passing through it. 
     
     
         14 . (canceled) 
     
     
         15 . Swim fin according to  claim 13 , wherein the streamlined blades are provided at their ends facing the holder with discs that close off the holes in the elongated holder.