| 摘要 |
Embodiments of the invention provide a trigger switch (1) in which a trigger (11) is pulled into a housing (5) so as to operate a contact mechanism, thereby driving a motor of an electric drill (10). The inside of the housing (5) is divided into a first region (201) including a circuit in which a main electric current for driving the motor flows, and a second region (202) including the contact mechanism of a signal circuit which controls a rotation of the motor. An air vent (100) is disposed on an outer circumferential surface of the first region (201) of the housing (5). The trigger switch (1) can reduce operational failure due to dust and the like without making the structure thereof complicated. |
