Patent ID: 8007345

Claim:
A portable belt sander comprising: a main body accommodating therein a motor; a drive shaft rotationally driven by the motor; a drive pulley coupled to the drive shaft to rotate therewith; a driven pulley rotatably disposed at a lower portion of the main body; and a polishing belt mounted between the drive pulley and the driven pulley; wherein the drive pulley comprises: a cylindrical base section coupled to the drive shaft and made from a rigid material, the base section having an outer end face and an outer peripheral surface extending in an axial direction of the base section; a plurality of protrusions formed on the outer peripheral surface and spaced away from each other in the circumferential direction of the outer peripheral surface, the plurality of protrusions extending in the axial direction; and an outer low hardness section made from an elastomer material by injection molding and formed over the outer end face and the outer peripheral surface of the cylindrical base section, the outer low hardness section having an inner peripheral surface formed with a plurality of complementary recesses fittingly engaged with the protrusions on the outer peripheral surface of the base section.