Button Fastener and Button Structure

Abstract

The button fastener comprises a fastener body and a cover member which is attached to the fastener body. The fastener body includes a disk-like base and a hollow, cylindrical post extending upward from a center area of the base concentrically. The post has a top opening at its upper end and a bottom opening in a center area of the base. The cover member covers the lower surface of the base including the bottom opening. The base includes a base bottom adjacent to the post and a base flange rising upward relative to the base bottom radially outward from the base bottom. The cover member includes a curved outer periphery curving from the lower surface side of the base and then rising upward beyond the base flange of the base.

1 . A button fastener for fastening a button to a fabric, comprising:
 a fastener body including a disk-like base and a post which extends upward from a center area of the base concentrically; and   a cover member which is attached to the fastener body so as to cover the lower surface of the base;   wherein said base includes a base bottom adjacent to the post and a base flange rising upward relative to the base bottom radially outward from the base bottom;   wherein said cover member includes a curved outer periphery curving from the lower surface side of the base and then rising upward beyond the base flange of the base.   
     
     
         2 . The button fastener according to  claim 1 , wherein said post is hollow and cylindrical and includes a top opening which is open at the upper end of the post and a bottom opening which is open in a center area of the base. 
     
     
         3 . The button fastener according to  claim 1 , wherein said upper end of the post is formed as a edge which is able to cut the fabric against the button when the button is fastened to the fabric. 
     
     
         4 . The button fastener according to  claim 3 , wherein said post includes a fold-back portion which is folded back radially inward and downward from the upper end of the post. 
     
     
         5 . The button fastener according to  claim 4 , wherein said fold-back portion includes, on its inner periphery, a first inclined surface which gently inclines radially inward and downward from the upper end of the post and a second inclined surface which steeply inclines radially inward and downward from the radially inner end of the first inclined surface. 
     
     
         6 . The button fastener according to  claim 1 , wherein said post includes a post proximal portion adjacent to the base, a post distal end including the upper end, and a post barrel portion linearly extending between the post proximal portion and the post distal portion, wherein the outer diameter of the post distal portion expands radially outward from the upper end of the post barrel portion, and the maximal outer diameter of the post distal portion is greater than the outer diameter of the post barrel portion. 
     
     
         7 . The button fastener according to  claim 6 , wherein the thickness of the post barrel portion, post distal portion and fold-back portion is gradually thinner from the lower end to the upper end of the post barrel portion, and then, via the post distal portion, from the upper end to the lower end of the fold-back portion, except for about the upper end of the post as the turn-round part of the fold-back portion. 
     
     
         8 . A button structure composed of a button and a button fastener for fastening the button to a fabric, the button fastener comprising:
 a fastener body including a disk-like base and a post which extends upward from a center area of the base concentrically; and   a cover member which is attached to the fastener body so as to cover the lower surface of the base;   wherein said base includes a base bottom adjacent to the post and a base flange rising upward relative to the base bottom radially outward from the base bottom;   wherein said cover member includes a curved outer periphery curving from the lower surface side of the base and then rising upward beyond the base flange of the base;   wherein said button includes a projection projecting upward and an annular flange extending radially outward from the projection;   wherein said projection defines a post-receiving space in the interior thereof for receiving, deforming and fixing the post which has pierced the fabric;   wherein said flange, in the state where the button has been fastened to the fabric with the post fixed in the post-receiving space, faces the curved outer periphery with the fabric held between the flange and the curved outer periphery.   
     
     
         9 . The button structure according to  claim 8 , wherein said post is hollow and cylindrical and includes a top opening which is open at the upper end of the post and a bottom opening which is open in a center area of the base.