Radial arm saw mortising adapter

A device for operatively coupling a chain saw blade to a power tool so that a chain saw on the blade is driven by a motor of the power tool, said device comprising:

• a base plate, said base plate including a flanged raceway which runs generally parallel to a longitudinal axis of the base plate;
• a drive spindle rotatably mounted to the base plate for rotation about a fixed axis generally perpendicular to a side face of the base plate, the drive spindle including a mechanism for directly and detachably coupling the drive spindle to an arbor of the power tool so that the power tool rotatably drives the drive spindle;
• a clamp mechanism for detachably securing the base plate to a component of the power tool, said clamp mechanism comprising a clamp bracket assembly for providing a clamping force on the component of the power tool, said clamp bracket assembly comprising two clamp brackets and permitting centering of said drive spindle on said arbor, at least one of the clamp brackets including a flanged portion for slideably engaging the flanged raceway of the base plate;
• a mechanism for adjustably and detachably mounting a chain saw blade and chain saw to the base plate such that 1) the chain saw engages and is driven by the drive spindle to move in a plane generally parallel to the side face of the base plate, 2) the chain saw blade is mounted such that a longitudinal axis of the chain saw blade intersects the axis of rotation of the drive spindle and is generally parallel to the longitudinal axis of the base plate and 3) the chain saw blade can be selectively adjusted in a direction generally parallel to the longitudinal axis of the chain saw blade to remove slack and vary tension on the chain saw engaged between the chain saw blade and the drive spindle.