Hook structure of a soft hook strap of a hook-and-loop fastener

Abstract

An improved hook structure, of a soft hook strap of a hook-and-loop fastener, has a width W and includes: a hook body integrally protruding upright from a substrate of the hook strap; and a curved head portion curvedly bent downwardly from a top end of the hook body, the head portion including a hook end and a neck portion extending between the hook body and the hook end, wherein a lower side of the neck portion has a curvature defined by an imaginary circle located in a space between the hook body and the hook end and the head portion has a height H defined by points A and B on head portion which are intersection points of a imaginary vertical line passing through the center of the circle intersecting with an upper side and the lower side of the head portion respectively. The width W of the hook structure and the height H of the head portion satisfies a relationship defined below: 0.1 <  1 - H W  < 0.3 .

1 . An improved hook structure of a soft hook strap of a hook-and-loop fastener having a width (W) and comprising:
 a hook body integrally protruding upright from a substrate of the hook strap; and   a curved head portion curvedly bent downwardly from a top end of the hook body, the head portion including a hook end and a neck portion extending between the hook body and the hook end, wherein a lower side of the neck portion has a curvature defined by an imaginary circle located in a space between the hook body and the hook end and the head portion has a height (H) defined by points (A) and (B) on the head portion which are intersection points of an imaginary vertical line passing through the center of the circle intersecting with an upper side and the lower side of the head portion respectively,   the improved hook structure being characterized in that the width (W) hook structure and the height (H) of the head portion satisfy a relationship defined below:   
       
         
           
             
               0.1 
               < 
               
                  
                 
                   1 
                   - 
                   
                     H 
                     W 
                   
                 
                  
               
               < 
               
                 0.3 
                 . 
               
             
           
         
       
     
     
         2 . The improved hook structure of a soft hook strap of a hook-and-loop fastener according to  claim 1 , wherein the hook structure is formed of a material containing about 40 wt % of Nylon and about 60 wt % of elastomer.