Closet flange reboring tool

DETAILED DESCRIPTION The present invention provides a reboring tool specifically structured for removing plastic closet flanges from installed plastic drainage pipes.
Our reboring tool is comprised of an elongated partially threaded shank or arbor to which is a removably affixed cutting head member and a non-circular centering guide member.
The guide member is provided in a short, and a long version for accommodating the two different diameters of drainage pipes commonly used in combination with plastic closet flanges.
One size of drainage pipe has both a smaller internal and external diameter allowing the hub of the closet flange to be positioned over the outside of the pipe, with the pipe bottoming out against the reduced diameter cylindrical flange or ridge within the top of the hub.
This first pipe size is considered 3" nominally sized pipe.
The second drainage pipe is 4" nominally sized, having a larger internal and external diameter that the 3" pipe.
With 4" nominal waste pipe, the hub of the closet flange is placed inside the interior of the pipe.
It should be noted that there are commonly used transitional bell shaped adapters for making a transition from a 3" nominal waste line to fitting over the exterior of the hub of the closet flange.
For the purpose of this disclosure, and for use and structure of our tool for that matter, this arrangement of 3" nominally sized pipe and a transitional bell adaptor is identical to the use of 4" nominal pipe fitted over the exterior of the hub of the closet flange.
Most plastic closet flanges manufactured today are made to be used with either 3" or 4" nominally sized ABS or PVC plastic waste lines, with a single closet flange being useful for either pipe size depending on the choice of the plumber.
Our centering guide member is basically a rectangular flat die stamped plate having rounded ends, with the length of the longer version of guide member sized for placement into, and being of a length to generally span between and ride against the interior annular wall of the hub of the closet flange with the closet flange affixed within the interior of a 4" nominal pipe or bell adaptor fitting