Patent ID: 7891388

Claim:
In an L-type planer side head body for rotation about a cylindrical axis and having a plurality of axially extending pockets uniformly and azimuthally spaced-apart along the circumference of the body, each pocket having a back surface for receiving the back side of a removable first knife disposed in the pocket, the back surfaces joining said circumference at respective lines of joinder, each back surface being aligned with a radial line drawn through the cylindrical axis and passing through the corresponding line of joinder within 5 degrees, the body including one or more toe bolts associated with each pocket and threadably received in the body in such manner that threaded ends of the bolts extend into the associated pocket adjustable amounts, for contacting and thereby clamping the first knife so as to provide a first cutting angle, the improvement comprising: a knife carrier for each pocket adapted to be clamped therein by the associated said toe bolts, said knife carrier having a slot for receiving a second knife having substantially less mass than the first knife, the slot defining in said knife carrier a front cantilevered portion for bearing against a front side surface of said second knife facing the direction of rotation of the side head and a back cantilevered portion for bearing against a back side surface of said second knife facing opposite said direction of rotation, and one or more clamping bolts for drawing said front and back cantilevered portions together so as to firmly clamp said second knife therebetween, said knife carrier as clamped in the pocket and said second knife as clamped in said knife carrier establishing a second cutting angle that is substantially the same as the first cutting angle.