| 摘要 |
This invention relates to a dowel fastening device for holes drilled in wood, masonry, plasterboard and other stable surfaces. In more detail a dowel fastening support device comprises a support end portion and a shank portion, a plurality of triangular-shaped members each having a curved gripping surface and two straight side surfaces, a hinge joint for each member connecting the adjacent ends of said two straight side surfaces to said shank portion whereby said members are pivotable in one direction when said shank is inserted in said opening, and when force is applied to said dowel fastening support in a direction away from said structural element said curved surfaces pivot in the opposite direction to frictionally grip the interior surfaces of said opening to thereby prevent the dowel fastening support from being dislodged from said structural element, each of said curved gripping surfaces having a configuration whereby the forward edge thereof at the junction of said curved gripping surface and adjacent straight side is spaced from said interior surfaces when said device is inserted in said bored opening, and a spade-shaped element having forward curved surfaces and a rear linear surface connected to the forward end of said shank portion, the distance between the junctions of the forward and rear surfaces on said spade-shaped element corresponding substantially to the interior diameter of said bored opening whereby said dowel is automatically centered when inserted in said bored opening. |
