Blade guard arrangement in motor-driven chop saw

Claim 1

A saw-blade guard arrangement in a motor driven chop saw, said chop saw including a saw table; a hinging member extending from said saw table and having a pivot shaft; and a saw unit pivotally movable with respect to said hinging member; said saw unit including a sawblade, an upper safety guard for partially encasing said saw blade, said upper safety guard pivotably connected to said hinging member through said pivot shaft, a motor casing connected to said upper safety guard, a motor housed in said motor casing, a drive shaft connected to said motor and fixing said saw-blade for its rotation, and a lower guard rotatable to a first direction for covering an exposed segment of said saw blade when said saw unit is in the upper rest position and rotatable to a second direction for uncovering said segment when the saw-unit is moved to the lowered operational position, said saw-blade guard arrangement comprising: a first biasing means disposed between said upper safety guard and said hinging member for urging said upper safety guard toward its upper rest position; an operation arm having one end portion pivotally rotatable about said pivot shaft; a link member having one end pivotally connected to other end of said operation arm, and having the other end pivotally connected to said lower guard, said lower guard being rotatably connected to a bearing portion of said drive shaft; a second biasing means disposed between said operation arm and said hinging member for urging said operation arm to a direction for urging said lower guard to said first direction; and, an adjusting means for controlling orientation of said operation arm, said adjusting means being provided on said hinging member at a position adjacent an end face of said one end portion of said operation arm.