Patent ID: 7557321

Claim:
A trigger switch comprising: a chassis; a slide member slidably retained in the chassis; a trigger connected to the slide member and projected from the chassis, the trigger configured to slide the slide member when the trigger is drawn towards the chassis; a pair of power-supply connecting terminals connected to a power supply; a pair of motor output terminals connected to a motor, a speed control circuit configured to output a current to the motor output terminal while controlling the current when the speed control circuit is connected to the power supply; a first contact mechanism configured to connect the power-supply connecting terminal to the speed control circuit when the trigger is drawn by a first amount; and a second contact mechanism configured to connect the power-supply connecting terminal to the motor output terminal when the trigger is drawn by a second amount, wherein each of the first contact mechanism and the second contact mechanism includes a movable piece and a fixed contact, the movable piece being formed by a swingably-supported metal plate, and the fixed contact being able to abut on the movable piece, the movable piece includes a support portion, an arm portion, and a lever portion, the support portion being swingably supported, the arm portion extending from the support portion, a movable contact being provided at a front end of the support portion, the movable contact being configured to abut the fixed contact, a spring seat being provided in an intermediate portion of the support portion, the spring seat receiving one end of a compression spring, the compression spring biasing the spring seat such that the support portion is separated from and brought into contact with the slide member, the lever portion being extended from the support portion toward an opposite side to the arm portion, the lever portion configured to abut on the slide member, and steps are formed in front of and at the back of the spring seat in the arm portion, the arm portion being bent such that the spring seat is recessed toward an opposite side to the slide member.