Patent ID: 6893194

Claim:
A combination of a patch and a tool for accessing hollow members comprising a patch and a tool assembly, said tool assembly further comprising a cylindrical hole saw having a cutting surface and at least one rebate blade, said rebate blade positioned adjacent to the exterior sidewall of said hole saw and said rebate blade having a cutting surface in a plane approximately parallel with the cutting surface of said hole saw and said rebate blade located a predetermined distance below said cutting surface of said cylindrical hole saw, said rebate blade further comprising an “L shaped” member, said “L shape” further comprising a cutting section having a cutting surface thereon and a base member section wherein said base member is attached to said tool assembly at angular positions with respect to said hole saw and further comprising a flange member, said flange member located on said hole saw on an end opposite said cutting surface and opposite the cutting surface of said rebate blades and said flange member extending a distance in a perpendicular direction from a central axis that is further than a distance said rebate blades extend from said central axis, wherein when said flange member engages a surface of a hollow member, further axial movement into said member is prevented and said rebate blades create an annular ledge in the surface of said member, and a circular-shaped patch, said patch having a thickness less than the distance from the cutting surface of said rebate blade to said flange member and a radius a distance less than the distance from a central axis of said hole saw and the outermost part of said rebate cutting surface, wherein said circular patch can seat on said annular ledge.