| 摘要 |
The present invention relates to a drilling bit capable of easily installing a steel pipe using a foldable wing bit. The drilling bit comprises: a bit body having a cutting edge excavation surface on one side, and a guide groove on an other side; a wing bit which has a shaft protrusion, guided along the guide groove of the bit body, on one side or both sides and be rotated by being assembled with the bit body around the shaft protrusion guided along the guide groove; a stopper member installed in the bit body in order for the shaft protrusion not to be separated from the guide groove; and an inclined support member installed in the bit body or the stopper member, and diagonally supporting a wing bit in order for the wing bit to rotate and be diagonally spread at a support angle in a direction of the wing bit. |
