Swim fin

Abstract

The present invention discloses a swim fin, including an outsole, a middle sole and a shoe upper sequentially provided from bottom to top; wherein the shape and size of the outsole match the shape and size of a human foot, the outsole is a rubber outsole made of a rubber; the middle sole includes a support part matching the shape and size of the outsole, and a webbed paddling part extending outward along a peripheral of a sole part of the support part; the middle sole is a polyurethane middle sole made of polyurethane; the shoe upper is formed by sewing diving suit fabric; and the middle sole is integrally formed by an upper-containing injection moulding process using the polyurethane, the middle sole is respectively connected to the shoe upper and the outsole during the integral forming process of the upper-containing injection moulding process.

1 . A swim fin, comprising: an outsole, a middle sole and a shoe upper which are fixedly connected sequentially from bottom to top,
 wherein a shape and size of said outsole match a shape and size of a human foot, said outsole is a rubber outsole made of a rubber;   said middle sole comprises a support part matching the shape and size of the outsole, and a webbed paddling part extending outward along a peripheral of a sole part of the support part; said middle sole is integrally formed from polyurethane by polyurethane injection moulding; said shoe upper is formed by sewing diving suit fabric; and an accommodation cavity for accommodating a whole human foot is formed between the support part of said middle sole and the shoe upper.   
     
     
         2 . The swim fin according to  claim 1 , wherein said middle sole is integrally formed by an upper-containing injection moulding process using polyurethane, and said middle sole is respectively integrally connected to the shoe upper and the outsole during an integral forming process of the upper-containing injection moulding process. 
     
     
         3 . The swim fin according to  claim 1 , wherein said middle sole further comprises an arched extending part which is provided with an opening and is arched upward along a top face of the support part; a first accommodation cavity for accommodating a toe is formed between an inner wall of said arched extending part and the support part located directly below the arched extending part; an opening edge of said arched extending part and an edge of the support part enclose a first connection part; said shoe upper comprises a second connection part for wrapping a sole and a heel and a third connection part for wrapping an ankle; said second connection part matches the first connection part of the middle sole; said second connection part is fixedly connected to the first connection part so as to form a second accommodation cavity for accommodating the sole and the heel; and after said second accommodation cavity and said first accommodation cavity are enclosed, an accommodation cavity for accommodating the whole human foot is formed. 
     
     
         4 . The swim fin according to  claim 1 , wherein a plurality of protrusions are provided on a bottom face of said outsole. 
     
     
         5 . The swim fin according to  claim 1 , wherein a plurality of grooves are provided at air edge of the bottom face of said outsole. 
     
     
         6 . The swim fin according to  claim 1 , wherein air elastic band is further provided on an outer surface of said shoe upper. 
     
     
         7 . The swim fin according to  claim 3 , wherein a zipper is provided on a side of the third connection part of said shoe upper. 
     
     
         8 . The swim fin according to  claim 3 , wherein a lifting ring is provided on a back face of the third connection part of said shoe upper.