Patent ID: 9102032
Filing Date: 2015-08-11
Classification: B24B

Abstract:
1. A disc grinder comprising: a body section having a drive source for producing a rotational output; a reduction gear section configured to reduce the rotational output of the drive source; a spindle coupled to the reduction gear section and configured to receive the reduced rotational output from the reduction gear section; wherein the spindle has a rotational axis in a direction intersecting with a longitudinal axis of the body section as viewed from a lateral side and is configured to be able to mount a circular grinding wheel thereto; a grinding wheel cover including a cover body portion configured to be able to cover the circumference of the grinding wheel and a mounting band portion capable of being mounted to a gear housing of the reduction gear section, wherein the mounting band portion is capable of being fastened around the gear housing as a fixing screw is tightened; a stopper projection provided on the mounting band portion; and a stopper contact portion provided on the gear housing; wherein a position adjustable range of the grinding wheel cover about the rotational axis of the spindle is restricted through contact between a stopper surface of the stopper projection and a stopper surface of the stopper contact portion; wherein the stopper contact portion extends along the gear housing in a circumferential direction about the rotational axis, the stopper contact portion forming a continuous cylindrical inner surface with one of opposite end portions of the stopper contact portion opposing to the stopper projection having an inclined surface so that a cross sectional area of the stopper contact portion with in a plane perpendicular to the rotational axis decreases in the circumferential direction toward the stopper projection: and wherein the inclined surface is inclined relative to a radial direction with respect to the rotational axis of the spindle, so that the inclined surface is deformed such that the cross sectional area of the stopper contact portion at the inclined surface increases at the stopper projection in order to absorb an impact produced when the stopper surfaces contact with each other.