Board anchor

Year	Description
1999	Invention patented by Katsuo Ito on July 28th, 1999. Abstract: An anchor that screws directly into a board without requiring a tap drill hole. A male screw is provided around the shaft part of the anchor with a drill part at one end and a flange part at the other end; at the end where the flange part is provided, a turning tool engagement hole and a female screw formed hole part continuous therewith are provided. The drill part is formed into a tapered-pyramid shape, multiple split shaft parts being formed by providing a slit that extends from the end surface of the pyramid-shaped drill part to midway up the shaft part. The tip of the split shaft part incorporate connected multiple drill bits that are formed by splitting the pyramid-shaped drill part.
Source: selected by the editor from original sources.

Invention: Board anchor