Patent ID: 7511240
Filing Date: 2009-03-31
Classification: H01H

Abstract:
1. A trigger switch comprising a switch mechanism equipped with a sliding circuit substrate and installed inside a case, and a control unit provided on the outside of the case to operate the switch mechanism according to sliding thereof, the switch mechanism comprising: a power control unit that turns a plurality of switches provided on the switch mechanism ON and OFF depending on a degree of retraction of the control unit by moving a pressing member over a top of a seesaw-shaped switching bar; a motor brake and control element short-circuit unit that moves a movable armature having two short-circuit contacts, the movable armature sandwiched and supported by two springs; and a speed control unit that, by sliding a plurality of moving contacts arranged in parallel over sliding circuit contacts of the sliding circuit substrate, controls a supply of power and a control element so as to control rotation of a motor, the motor brake and control element short-circuit unit simultaneously short-circuiting the two short-circuit contacts provided on the movable armature against contacts of a short-circuit terminal strip against an urging force of the springs so as to effect an electrical connection, and short-circuiting the control element at some arbitrary point in time at which the degree of retraction of the control unit is increased.