Fastening member and siding boards attachment structure using the fastening member

Abstract

A fastening member 10 produced from a single steel sheet that is capable of stably supporting an exterior wall board and ensuring ventilation between the board and a building frame. The fastening member 10 comprises a left-side support portion 12 L and a right-side support portion 12 R on either side thereof that abut on the back surface of a board when fastened. In the intermediate region between the left-side and right-side support portions 12 L and 12 R, there are provided, from top to bottom, a substrate portion 11 that functions as a mount portion to be fixed to the building frame, a central support portion 12 C to be abutted against the back surface of a board when fastened, a locking portion 21 to be locked on the upper and lower edges of boards when fastened, and a lower support portion 12 U to be abutted against the back surface of a board when fastened.

1 . A fastening member for an exterior wall board, said fastening member comprising a left-side and a right-side support portion on either side thereof, said support portions being adapted to abut on a back surface of a board when said board is fastened, said fastening member comprising, in the intermediate region between said left-side and right-side support portions, from top to bottom: 
 a substrate portion that constitutes a mount portion to be fixed to a building frame;    a central support portion that abuts on the back surface of the board when fastened;    a locking portion extending from a lower edge of said central support portion and being adapted to be locked on an upper and a lower edge of the board when fastened; and    a lower support portion that abuts on the back surface of the board when fastened, wherein    said fastening member is formed from a single sheet of steel, wherein said substrate portion is formed by depressing a portion of an upper region of the steel sheet toward the back surface, and said locking portion is formed by cutting a portion of a lower region of the steel sheet and raising it toward the front surface.    
   
   
       2 . The fastening member according to  claim 1 , wherein said locking portion comprises at least one rise portion and at least one fall portion at an edge thereof.  
   
   
       3 . The fastening member according to  claim 2 , wherein an area on either side of said fall portion near the lower edge thereof is bent toward the back surface of said fastening member such that the bent portions press against the board when fastened.  
   
   
       4 . The fastening member according to  claim 1 , wherein at least one of said right-side, left-side, and lower support portions comprises a collar portion extending from an external edge thereof further outward, wherein said collar portion is located in the same plane as that of said substrate portion.  
   
   
       5 . The fastening member according to  claim 1 , wherein a cut is provided in an upper edge of said substrate portion near said left-side and right-side support portion.  
   
   
       6 . An exterior-wall structure comprising a plurality of said fastening members according to  claim 1  that are mounted in multiple rows such that their substrate portions abut on a fixing surface of a building frame, and a plurality of boards each with a rabetted portion provided at at least an upper edge and a lower edge, wherein said boards are fastened in multiple rows such that they have their back surfaces abutting on said left-side, right-side, central, and lower support portions of the fastening members, the rabetted portion at the upper edge is locked on said locking portion of an upper fastening member, and the rabetted portion at the lower edge is locked on said locking portion of a lower fastening member.