Fin

Abstract

A fin comprising a foot pocket, two ribs and a web portion is provided in this invention. The foot pocket has a surrounding portion and a base portion, which together define a foot receiving space. The surrounding portion has a plurality of first and second structures; the ribs extend forwards from two sides of the foot pocket respectively; and the web portion is formed between the two ribs. The first structures and the second structures are alternately arranged, and a first thickness of each of the first structures is thicker than a second thickness of each of the second structures. Thereby, the foot pocket of the fin is made flexible and elastic for swimmers or divers with different foot forms and sizes.

1 . A fin, comprising:
 a foot pocket, having a surrounding portion and a base portion for defining a foot receiving space, and the surrounding portion having a plurality of first structures and a plurality of second structures;   two ribs, extending forwards from two sides of the foot pocket respectively; and   a web portion, being formed between the two ribs,   wherein the first structures and the second structures are alternately arranged, and a first thickness of each of the first structures is thicker than a second thickness of each of the second structures.   
     
     
         2 . The fin as claimed in  claim 1 , wherein the surrounding portion comprises a dorsum pedis area. 
     
     
         3 . The fin as claimed in  claim 2 , wherein the surrounding portion further comprises two ankle areas and a heel area, and the ankle areas extend from two ends of the dorsum pedis area respectively and connect to the heel area to define the foot receiving space with the base portion. 
     
     
         4 . The fin as claimed in  claim 3 , wherein the first structures and the second structures are formed on at least one of the dorsum pedis area, the ankle areas or the heel area. 
     
     
         5 . The fin as claimed in  claim 3 , wherein the dorsum pedis area comprises a front end and a rear end, and the first structures and the second structures are formed on at least one of the front end or the rear end. 
     
     
         6 . The fin as claimed in  claim 3 , wherein each of the ankle areas has at least one hole. 
     
     
         7 . The fin as claimed in  claim 3 , wherein a vertical height of the ankle areas and a vertical height of the heel area define an altitude difference therebetween. 
     
     
         8 . The fin as claimed in  claim 7 , wherein the altitude difference is between 10 mm and 80 mm. 
     
     
         9 . The fin as claimed in  claim 5 , further comprising a hollow portion formed in front of the front end. 
     
     
         10 . The fin as claimed in  claim 1 , wherein the first structures and the second structures are alternately disposed along a direction. 
     
     
         11 . The fin as claimed in  claim 1 , wherein the first structures and the second structures are radially and alternately disposed. 
     
     
         12 . The fin as claimed in  claim 1 , wherein the first thickness is between 1 mm and 15 mm, the second thickness is between 0.5 mm and 5 mm, and the first thickness is 0.5 mm to 14.5 mm thicker than the second thickness. 
     
     
         13 . The fin as claimed in  claim 1 , wherein a material of the foot pocket is a soft material selected from Thermoplastic Rubber (TPR), Thermoplastic Polyurethane (TPU), Thermoplastic Elastomer (TPE), Polyvinyl Chloride (PVC), Silicone Rubber, Natural Rubber, Ethylene Vinyl Acetate (EVA) or a combination thereof. 
     
     
         14 . The fin as claimed in  claim 1 , further comprising two connecting components and a flexible belt, each of the connecting components being disposed on each of the sides of the foot pocket respectively, each of the connecting components having at least one protrusion, two ends of the flexible belt having at least one hole respectively, and the at least one hole mating with and being connected to the at least one protrusion. 
     
     
         15 . The fin as claimed in  claim 14 , wherein the at least one protrusion comprises a plurality of protrusions, the at least one hole comprises a hole, and one of the protrusions mates with and is connected to the hole. 
     
     
         16 . The fin as claimed in  claim 14 , wherein the surrounding portion further comprises at least one securing ring, and the flexible belt passes through the at least one securing ring. 
     
     
         17 . The fin as claimed in  claim 14 , wherein the at least one protrusion extends forwards to the web portion. 
     
     
         18 . The fin as claimed in  claim 14 , wherein the surrounding portion further comprises a heel area, and the at least one protrusion extends backwards to the heel area. 
     
     
         19 . The fin as claimed in  claim 14 , wherein a material of the protrusions is selected from Ethylene Vinyl Acetate (EVA), Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (PC), Polypropylene (PP), Polyoxymethylene (POM) and the combination thereof. 
     
     
         20 . The fin as claimed in  claim 14 , wherein a material of the flexible belt is a soft material selected from Thermoplastic Rubber (TPR), Thermoplastic Polyurethane (TPU), Thermoplastic Elastomer (TPE), Polyvinyl Chloride (PVC), Silicone Rubber, Natural Rubber and a combination thereof.