Narrow kerf saw blade disc for tree felling head

A disc for a circular saw blade of a tree felling head of a type which has cutting teeth fixed about a periphery of the disc and is rotated about a generally vertical axis so that the teeth cut a generally horizontal kerf through a standing tree, comprising:

• a circular disc plate of a certain thickness having an upper surface, a lower surface and a central plane midway between said upper and lower surfaces;
• and
• a rim around said disc plate of a different thickness than said thickness of said disc plate, said rim having an upper surface, a lower surface and a central plane midway between said upper and lower surfaces of said rim, said central plane of said rim being offset from said central plane of said disc plate;
• a plurality of tooth holders carried by said rim at angularly spaced locations about a periphery thereof, each said tooth holder mounting only a single cutting tooth that defines a cutting plane which is a central plane of a kerf produced by said tooth;
• wherein said cutting plane is offset from said central plane of said plate on the side of said central plane toward said upper surface of said plate.