Window assembly and lower saw guard for circular saw

摘要

A window assembly (25) is provided for use on a hand-held circular saw (10). The window assembly (25) has a transparent member (26) that is attached to an upper guard of the saw. The transparent member (26) has a forward edge and a rearward edge and slopes downwardly to form a rearwardly facing acute angle with respect a planar base (21) of the saw. The acute angle has a minimum value ( alpha ) to prevent light from overhead sources from reflecting into the user's eyes and has a maximum value ( beta ) to prevent light from forward light sources from reflecting into the user's eyes. The forward edge of the transparent member is located rearwardly of the point at which a predetermined line (30) intersects the guard. Additionally, a lower blade guard (20) is provided for use on a circular saw having a clear viewing window on the upper blade guard. The lower blade guard has a truncated portion that allows a line of sight between the workpiece being sawed and the clear viewing window even when the lower guard is in a fully retracted position.