Abstract: A wiskar for sharpening cutting teeth of a chain provided on a chain bar of a chain saw. A housing is removably attached to the chain bar and includes a recess to receive the wiskar therein. The wiskar includes a first member configured to be operationally engaged by the recess of the housing; and a second member configured to frictionally engage a bottom surface of the cutting teeth. The second member includes a body portion intermediate the opposing ends, wherein opposing ends of the second member each have at least one lobe defined therein. Abrasives are uniformly impregnated throughout the first and second member to sharpen the bottom surface of the cutting teeth. At least the second member is manufactured from a pliable material that erodes due to friction caused by the cutting teeth engaging the lobes of the second member.

Abstract: A saw chain sharpener for a chain saw and a chain saw having a sharpener in which the bottom surfaces of the cutting teeth of a conventional bottom sharpened saw chain are conveniently sharpened automatically by running the chain under power through the sharpener. The saw chain can be sharpened using the sharpener in a matter of typically twenty to thirty seconds without removing the chain from the chain bar. The sharpener is preferably adapted to be removably mounted to a bracket which is itself preferably removably disposed on the chain saw. The sharpener comprises a sharpening tooth disposed in a housing which is mounted on the chain bar. A top surface of the sharpening tooth frictionally engages bottom surfaces of the cutting teeth of the chain as the chain is run under power. A device for dispensing a sharpening compound to the sharpening tooth during sharpening may be disposed on the sharpener housing.