| 摘要 |
A trigger assembly for an electric power tool including an electric motor, comprising a base for fixing within the tool and a trigger supported by the base for inward and outward movement. The base has a housing having first and second compartments separated by a partition that includes an aperture. A main switch is provided in the first compartment, having first and second contacts co-operable to switch on and off the motor. A slider is provided in the first compartment and is movable by or with the trigger for moving the first and second contacts into contact with one another or apart, the slider including a sliding contact. The base includes an electronic control circuit mounted on a circuit board located in the second compartment for controlling the operation of the motor. The circuit board includes at least one conductive track for contact by the sliding contact through the aperture. A shield extends around the aperture and is in abutment with the circuit board for blocking debris resulting from switching action of the main switch against reaching the circuit board beyond the track.
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