| 摘要 |
<p>According to the invention, a drilling tool includes: a driving source; a transmission drive unit for transmitting a rotation force of the driving source to rotate an end tool; and a dust collector (10) for collecting dust produced from a workpiece drilled by the end tool and blowing air against a vicinity of a drilled portion, characterized in that a filtering means (13) for filtering the air mixed with the collected dust and a centrifugal fan (14) for taking in the filtered air and sending out the filtered air in a circumferential direction are provided, the centrifugal fan is disposed in a housing formed with an airflow sending port for sending a part of the air taken in to the dust collector (10) for a blowing operation and a discharge port for discharging a rest of the air to an outside, and a distance from the airflow sending port to the discharge port in a forward direction in a direction of rotation of the centrifugal fan is longer than the distance from the airflow sending port to the discharge port in a backward direction in the direction of rotation.</p> |
