Patent ID: 7513718

Claim:
An alignment device for hole saw, which includes: a first cone shaped alignment member which has a first end having an outer width less than an inner diameter of the hole saw and having an outer width greater than an inner diameter of the surface defining a hole of the work piece and has an inner surface defining an opening to receive a bit of the saw therethrough to enable alignment bearing surface therefor and a second tapered end at least a portion of which is less diameter than said surface defining the hole of the work piece to be received adjacent thereto and a second cone shaped alignment member having a first end having an outer width greater than the inner diameter of the surface defining the hole of the work piece and a second end at least a portion of which is less than the inner diameter of the surface defining the hole of the work piece to be received adjacent thereto; and means for bringing together said first alignment member and said second alignment member against the work piece in a manner wherein as said second ends are brought together and contact the surface defining the hole of the work piece said first end of said first alignment member is caused to be centered within the hole and thereby maintaining said first alignment member in a predetermined aligned position with respect to the work piece.