Wood chipper

Claim 1

A wood chipper comprising, (a) a drive shaft mounted for rotation in a supporting housing, (b) a disc unit having a pair of adjacent disc elements mounted on said drive shaft for rotation therewith the inner surface of one said disc element in face-to-face relationship with the inner surface of the other said disc element, (c) means securing said one disc element to said other disc element, (d) angularly spaced aligned passageways through said one disc element and said other disc element, (e) there being a recess in said one disc element at the trailing side of each angularly spaced passageway therethrough as viewed in the direction of rotation of said disc unit, (f) a knife holder mounted within each said recess in said one disc element with the end of said knife holder removed from said aligned passageways being spaced from said one disc element to define means therebetween for receiving a babbit-like metal that accurately locates said knife holder and limits movement thereof, (g) means securing said knife holder to said other disc element, (h) a knife carried by each said knife holder adjacent said aligned passageways with the edge of said knife opposite its cutting edge engaging an abutment carried by said knife holder so that said knife holder takes the thrust of said knife, (i) a knife clamp at the opposite side of said knife from said knife holder, (j) means connecting said knife clamp to said knife holder to secure said knife therebetween, (k) interlocking means carried by said knife clamp and said knife holder engaging each other and limiting relative movement therebetween both axially and radially to maintain accuracy of the knives relative to each other in all directions, and (l) means to feed wood to one side of said disc unit so that the wood is cut into chips which pass through said aligned passageways to the other side of said disc unit.