Patent ID: 8403730

Claim:
A grinder comprising: a main body portion including a drive source, a speed reduction gear portion reducing a rotational output of the drive source, a spindle having a rotational axis in an orthogonal direction to a body length direction of the main body portion as viewed from a lateral side, and a grinding stone cover covering a part of a circumference of a circular grinding stone mounted to the spindle, and a stopper device configured to support the grinding stone cover on a gear housing receiving the speed reduction gear portion therein such that a position can be changed about the axis of the spindle to change a range of covering the circumference of the grinding stone, so that a position adjustable range about the axis of the spindle in the rotational direction of the grinding stone is restricted, wherein: the stopper device includes a first stopper member attached to the grinding stone cover, and a second stopper member attached to the gear housing, the first stopper member can abut to the second stopper member in the rotational direction of the grinding store when the first stopper member is at an abutting position, the second stopper member does not interfere with the movement of the first stopper member when the first stopper member moves from the abutting position in a direction opposite to the rotational direction of the grinding stone.