Patent ID: 7178438

Claim:
A power miter saw comprising: a support base; a mounting arm connected to the support base; a fixed guard pivotally connected to the mounting arm by a first rotating shaft, the fixed guard being pivotal about the rotating shaft between an upper at rest position and a lower cutting position; a drive means having an output rotating shaft; a circular saw blade fixed to the output rotating shaft and mounted within the fixed guard; a movable guard rotatably connected to the fixed guard by a second rotating shaft; an actuating link for linking the mounting arm with the movable guard, wherein the front end of the actuating link is connected to the movable guard causing the movable guard to be rotatably openable to expose the circular saw blade for cutting in response to movement of the fixed guard from the upper at rest position to the lower cutting position characterized in that the power miter saw further comprises: a first guide coupling between the rear end of the actuating link and the mounting arm, wherein the first guide coupling guides the rear end of the actuating link in an arcuate direction relative to the mounting arm in response to movement of the fixed guard from the upper at rest position to the lower cutting position such that the movable guard moves substantially outwardly; and a third guide coupling between the rear end of the actuating link and the mounting arm, wherein the third guide coupling guides the rear end of the actuating link in a direction relative to the mounting arm which is substantially along its longitudinal axis in response to movement of the fixed guard from the upper at rest position to the lower cutting position.