Abstract: A tool for removal of rivets includes three main sections--a tubular body section, a base, and a drive shaft assembly. The drive shaft assembly includes an upper portion to be received in the chuck of a rotational source of power and a lower portion to be received in the bore of the tubular body. An internally threaded drill receiving socket is disposed at a lower end of the lower portion of the drive shaft. The body section includes a coil spring for retracting the drill and a drill stop bushing for limiting the depth of penetration of the drill bit into the rivet. The base includes an upper disc and a larger diameter lower disc and three equally spaced tubular legs connect the upper disc to the lower disc. The bottom of the base includes a non-slip polymeric pad for contacting a work surface surrounding the rivet and stabilizing the cutting path of the drill.

Abstract: A hole preparation apparatus for back drilling, upsizing and reaming mating precision holes. The apparatus includes three main sections--a tubular body section, a base and a drive shaft assembly.The drive shaft assembly includes an upper portion sized to be received in the chuck of a conventional pneumatic or electric drill, a lower portion sized to be received in the bore of the tubular body. An internal threaded drill receiving socket is disposed at a lower end of the lower portion of the drive shaft. A coil retractor spring is located in the central bore of the tubular body section. A removable pilot drill is received in the drill receiving socket. A pilot drill bushing is located in the bottom end of the bore of the tubular body. An opener drill is changeable with the pilot drill and is received in the drill receiving socket when the pilot drill is removed. An opener drill bushing, is changeable with the pilot drill bushing.

Abstract: A tool for removal of rivets includes three main sections--a tubular body section, a base, and a drive shaft assembly. The drive shaft assembly includes an upper portion to be received in the chuck of a rotational source of power and a lower portion to be received in the bore of the tubular body. An internally threaded drill receiving socket is disposed at a lower end of the lower portion of the drive shaft. The body section includes a coil spring for retracting the drill and a drill stop bushing for limiting the depth of penetration of the drill bit into the rivet. The base includes an upper disc and a larger diameter lower disc and three equally spaced tubular legs connect the upper disc to the lower disc. The bottom of the base includes a non-slip polymeric pad for contacting a work surface surrounding the rivet and stabilizing the cutting path of the drill.