Patent ID: 8529169
Filing Date: 2013-09-10
Classification: B23Q,Y10T

Abstract:
1. A drilling tool comprising: a motor; a transmission drive unit for transmitting a rotation force of the motor to rotate a drill bit; a dust collector for collecting dust produced from a workpiece drilled by the drill bit, the dust collector being provided with a pierced portion pierced by the drill bit, a dust collection port for sucking the produced dust and its surrounding air, and a blowoff port for blowing air against a vicinity of the piercing drill bit; and a fan for generating an air flow flowing from the dust collection port to an outside of a housing, a part of the air sucked from the dust collection port is returned to the blowoff port, wherein the dust collector has a retractable duct having a passage extending from the dust collection port to the fan via a dust collection filter and a passage extending from the fan to the blowoff port, and wherein a direction of the airflow blown from the blowoff port is a direction generally in parallel with an axial direction of the drill bit in the pierced portion of the dust collector.