DRILL FOR MAKING HOLES WITH RELIEVING IN THE MASONRY Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: drill for making holes in the masonry has a drilling head with lateral cutting edges protruding on the side, on the drill core, and a thickening on the drill core at a certain distance from the drilling head. The thickening serves as a swinging support. The drill core adjoining the thickening toward the deepening limiter contains at least a cylindrical section with the decreased diameter. This section forms a transition with sharp edges. EFFECT: enhanced efficiency. 1 cl