Abstract: The present invention is a rotary tool cutter tooth having a readily replaceable cutting portion and a tool employing the tooth. The tooth consists of an elongated shank for mounting the tooth on the tool body with a cutter element being bolted to the forward end of the shank. Preferably the back face of the cutter element is vertically grooved to receive the forward end of the shank so that the two are precisely aligned and any forces which tend to rotate the cutter element during use are resisted. The face of the shank that adjoins the cutter element may further be provided with a negative or inverted step which engages a corresponding step across the groove of the cutter element. These steps interlock to resist forces which would tend to translate the cutter element radially outward when in use. The cutter element may be made of a tool steel or other hard alloy, whereas the shank is typically formed from a mild steel.

Abstract: The present invention is an improved heavy duty circular saw useful for tree falling in conjunction with mechanized feller/buncher equipment. The saw is characterized by ruggedness, easy field repairability, and safety of operation. It is constructed using a flat metallic saw plate of circular configuration. A series of flat segment members are attached around the periphery of the saw plate on each face. Each of these segment members has a plurality of buttress- or tooth-shaped tooth retaining portions on the outer periphery. These buttresses are formed with gullet-shaped spaces between them. The segment members are in an abutting end-to-end relationship on each face of the saw plate. Segment members on opposite sides of the plate are in a staggered configuration so that the abutting end portions of the members on one side are generally located opposite the central portions of the segment members on the opposite side. The tooth retaining buttresses on each side are maintained in an aligned relationship.