Abstract: A log slabbing chipper with multiple knife structures distributed about the periphery of a power-driven rotor head. Each knife structure includes a holder, and a pair of knife mounting assemblies secured to the holder. Each knife mounting assembly mounts a double-edged replaceable knife.

Abstract: A chipping cutter head having multiple spindle segments disposed side-by-side and forming a body in the cutter head. Circumferentially distributed pockets in each spindle segment have knife holders detachably mounted therein and held in place by clamps. Double-edged knife elements, that are replaceable, are detachably clamped in position on each knife holder.

Abstract: A double-edged knife detachably mounted on a counter knife. The knife overlies surfaces inclined and oriented so that when the knife is clamped in place, it is held well rearwardly an edge in the knife which is exposed for cutting. Fasteners hold the counter knife and these are protected from damage by a shoulder.

Abstract: Chipper apparatus including a rotating disc with one or more knives mounted on the disc operable to produce wood chips under the cutting action of the knives. Each knife comprises an elongate knife body bounded by opposed cutting edges. The knife includes a back side formed back knife surfaces extending inwardly on the knife from its cutting edges and the back knife surfaces meeting with a bearing surface. The front side of the knife includes front knife surfaces extending inwardly on the knife from its cutting edges joining with an elongated key-receiving channel indented inwardly into the knife body. A knife is mounted on a rotatable chipper disc through a clamp member which bears against the bearing surface of a knife and a counter-knife which supports the front side of the knife and which includes an elongate key portion fitting within the key-receiving channel of the knife.

Abstract: Chipper apparatus including a rotating disc with one or more knives mounted on the disc operable to produce wood chips under the cutting action of the knives. Each knife comprises an elongate knife body bounded by opposed cutting edges. The knife includes a back side formed by back knife surfaces extending inwardly on the knife from its cutting edges and the back knife surfaces meeting with a bearing surface. The front side of the knife includes front knife surfaces extending inwardly on the knife from its cutting edges joining with an elongate key-receiving channel indented inwardly into the knife body. A knife is mounted on a rotatable chipper disc through a clamp member which bears against the bearing surface of a knife and a counter-knife which supports the front side of the knife and which includes an elongate key portion fitting within the key-receiving channel of the knife.