Rotary cutting tool

Claim 1

IN A PORTABLE CUTTING TOOL OF THE TYPE HAVING A HOUSING, A DRIVE SHAFT ROTATABLY SUPPORTED WITHIN THE HOUSING AND MOUNTING A CUTTING BIT THEREON, MEANS WITHIN THE HOUSING INCLUDING A MOTOR FOR ROTATABLY DRIVING THE DRIVE SHAFT AND CUTTING BIT, AND A HOUSING GUIDE BRACKET HAVING A BASE PORTION SPACED LATERALLY OF THE AXIS OF THE DRIVE SHAFT AND ENGAGEABLE WITH A SURFACE OF A WORKPIECE FOR GUIDING THE CUTTING BIT FOR TRIMMING AN EDGE THEREOF, THE IMPROVEMENT COMPRISING MEANS FOR PIVOTALLY ADJUSTING THE BASE PORTION OF THE HOUSING GUIDE BRACKET ABOUT AN AXIS EXTENDING LATERALLY OF THE AXIS OF THE DRIVE SHAFT, AND A CONTOUR GUIDE SPACED LATERALLY OF THE AXIS OF THE DRIVE SHAFT MOUNTED ON THE HOUSING, SAID CONTOUR GUIDE HAVING AN OUTER PERIPHERY WITH A PROFILE IN A LATERALLY EXTENDING PLANE OF A PORTION OF A CIRCLE HAVING ITS CENTER ON THE AXIS OF THE DRIV SHAFT, SAID CIRCLE PORTION INTERSECTING A RADIAL OF THE AXIS OF THE SHAFT EXTENDING NORMAL TO THE PIVOTAL AXIS OF THE BASE PORTION, AND MEANS FOR AXIALLY ADJUSTING THE CONTOUR GUIDE ON THE HOUSING FOR POSITIONING THE CONTOUR GUIDE PROFILE IN A PLANE INTERSECTING THE PORTION OF THE CUTTING BIT OPERATIVE FOR TRIMMING THE EDGE OF THE WORKPIECE AND EXTENDING NORMAL TO THE AXIS OF THE CUTTING BIT WHEREBY THE CONTOUR GUIDE IS AXIALLY ADJUSTABLE FOR ENGAGEMENT WITH A SURFACE AGAINST WHICH THE EDGE OF THE WORKPIECE IS TO ABUT FOR GUIDING THE CUTTING BIT ALONG THE WORKPIECE FOR TRIMMING A COMPLEMENTARY ABUTTING EDGE THEREON.