| 摘要 |
A double-pole, trigger-operated switch for controlling the speed of an electric motor, particularly in a portable tool, comprises two screw-clamp terminals for connection to the power lines and having respective stationary contacts 36, 38 connected thereto, two movable contacts 30, 32 pivotally mounted at their upper ends to a printed circuit board to which a control circuit is connected and pivotally connected at mid-points to respective limbs of a nylon cam follower 28, so that depression of the trigger 6, depressing with it an actuator 26 having a cam 26c, causes downwards movement of cam follower 28, guided in a race 2m, to spread its limbs and pivot the movable contacts into contact with stationary contacts 36, 38. |
