COOLANT SUPPLY DEVICE AND ELECTRIC DRILL UNIT PROVIDED WITH COOLANT SUPPLY DEVICE

摘要

The present invention relates to a coolant supply device (A) attached to an electric drill device to supply coolant to a piercing portion at a tip end of the drill (10) at the time of piercing. The coolant supply device comprises a first flange member (3) and a second flange member (4) on a rotation shaft (1) provided coaxially with the drill so that the first flange member (3) is provided along the shaft and located on the drill side and the second flange member (4) is provided along the shaft and located farther from the drill than the first flange member, a space (S) formed between the both flange members and to which the coolant is introduced, a coolant supply passage (P) formed between the first flange member and the drill to guide the coolant in the space to the drill, and a coolant extrusion mechanism to extrude the coolant in the space toward the coolant supply passage.