Patent ID: 8186067

Claim:
A portable circular saw comprising: a housing; a motor accommodated in the housing; a circular saw blade driven by the motor for cutting a cutting object in a cutting direction, the circular saw blade having one side surface and another side surface and further having a frontmost point in the cutting direction and a cutting point that cuts and intersects with the cutting object; a saw cover provided to the housing for partially covering the circular saw blade; a base pivotally movably supporting the housing and the saw cover and having a contact surface that contacts the cutting object, the circular saw blade protruding through the contact surface; a protrusion amount changing mechanism provided on the base for changing an amount of protrusion of the circular saw blade from the contact surface and comprising a pivot support portion provided on a front section of the base in the cutting direction for pivotally movably supporting the housing and the saw cover with respect to the base to change the amount of protrusion; and a light irradiation unit provided on the saw cover and comprising comprising: a first irradiation device located on the one side surface side of the circular saw blade, and a second irradiation device located on the another side surface side of the circular saw blade, wherein the light irradiation unit emits a light from both sides of the circular saw blade to illuminate a region including a leading end portion of the circular saw blade and a spot on the cutting object, the leading end portion being a portion that is radially inward of the circular saw blade, that is, a distance between a center of the circular saw blade and the leading end portion in a radial direction of the circular saw blade is shorter than a radius of circular saw blade, at a front side in the cutting direction of the circular saw blade, and the spot being a portion that is radially outward of the circular saw blade, that is, a distance between the center of the circular saw blade and the spot in the radial direction of the circular saw blade is greater than the radius of the circular saw blade, wherein the spot is located ahead of the leading end portion in the cutting direction and includes at least an area that is positioned below a portion of the circular saw blade between the frontmost point and the cutting point, and wherein the light irradiation unit is disposed between the center of the circular saw blade and the pivot support portion of the protrusion amount changing mechanism.