To provide a board fastener capable of improving working efficiency, to obtain several-time support effects more than a previous one, and to prevent a deficit resulting from an installation failure and the excessive compression of a hole edge.
The board fastener 1 is a board fastener having especially at least a three-stepped polymerization supporting effect, and comprised of a nail setting portion 30 and a bolt 14. The nail setting portion is formed of a tubular body wound with a plane object. A plurality of longitudinally long holes 316 and a plurality of long and narrow parts 310 are formed in a working section arranged in the middle step. After being pulled by a pulling tool and bent by a stress concentration, the board fastener combined with the component prevents the deficit resulting from the installation failure and the excessive compression of the hole edge by generating a polymerization support force by the material.
COPYRIGHT: (C)2008,JPO&INPIT
CHEN CHIH-TSUNG
Hideo Sugiyama
Koichi Yuda
Uozumi Takahiro
Naohiko Teshima