Patent ID: 7108212
Filing Date: 2006-09-19
Classification: E21C,Y10T

Abstract:
1. A cutting tool comprising: a tool holder including a base, lateral surfaces extending upward from the base to an uppermost edge of each lateral surface, a top surface connecting uppermost edges of the lateral surfaces, a slot in a first of the lateral surfaces extending through the top surface, and an opening in the first lateral surface intercepting the slot, a retainer having a perimeter surface dimensioned to be received in the opening in the tool holder first lateral surface through movement of the retainer relative to the tool holder along a line of action, the retainer including a planar tapered surface inclined with respect to the line of action and intersecting the perimeter surface, and a cutting bit including a generally rectangular body portion dimensioned to be received in the slot at a fixed orientation, an upper end projecting above the tool holder top surface and including a cutting surface, and a lower planar tapered portion obliquely inclined to face laterally and upwardly and positioned for contact by the retainer planar tapered surface so that a downward and laterally inward force can be applied to the cutting bit by the retainer to maintain the cutting bit in the tool holder slot.