Soffit saw and extension

A soffit saw and extension, comprising:

• a) a first hole saw, the first hole saw being cup shaped and having extended sides terminating in cutting teeth, the first hole saw further having a base, the base having a centrally threaded hole defined therein;
• b) a coupling arbor, the coupling arbor having a first portion, the first portion having a first threaded portion the first threaded portion threadably receiving the centrally threaded hole in the first hole saw, the first threaded portion of the coupling arbor having a central hole defined therein, the central hole positioning and fixing a centrally located pilot bit central pilot bit, the centrally located pilot bit being fixed by either a friction fit or by threadably securing the central pilot bit into the coupling arbor;
• c) a first retainer plate is slideably positioned on the first portion of the coupling arbor, the first retainer plate having a centrally located clearance hole defined therein, the centrally located clearance hole allows for a slip fit around the first threaded portion of the coupling arbor;
• d) a first retaining nut is threadably placed on the first threaded portion (24) of the coupling arbor, a grommet is placed between the retaining nut (90) and the first retainer plate;
• e) the base of the first hole saw further having cylindrical cutouts defined therein, the cylindrical cutouts in the base of the first hole saw slideably receiving cylindrical bosses on the first retainer plate;
• f) the cylindrical cutouts in the base of the first hole saw are positionally aligned with corresponding cylindrical bosses on the first retainer plate that rotationally secures the first hole saw onto the coupling arbor when the first retainer plate is slidably moved to allow the cylindrical bosses to engage the cylindrical cutouts, a first retaining nut rotatably secures the first retainer plate by tightly bearing against a grommet and the first retainer plate;
• g) The coupling arbor has a second opposing end, the second opposing end having a second threaded portion defined thereon, the second threaded portion of the coupling arbor having a central hexagonal hole defined therein, allowing a hexagonal shank to be secured into the hexagonal hole;
• h) a first drive cup is cup-shaped, and having elongated sides terminating in a plurality of cutting teeth, and further having a base, where the base has a centrally located threaded hole defined therein, where the centrally threaded hole of the first drive cup is threadably secured onto the second threaded portion of the coupling arbor;
• i) the coupling arbor has a second retainer plate defined thereon, the second retainer plate has a centrally located clearance hole defined therein, the second retainer plate is slideably positioned on the second threaded portion of the coupling arbor;
• j) the base of the first drive cup has two cylindrical cutouts defined therein where the cylindrical cutouts are positionally aligned with corresponding cylindrical bosses positioned on the second retainer plate thereby rotationally securing the first drive cup onto the coupling arbor when the second retainer plate is slidably positioned to allow the cylindrical bosses to engage the cylindrical cutouts on the second hole saw, a second retaining nut rotatably secures the second retainer plate by tightly bearing against a grommet and the second retainer plate, the first drive cup has a diameter that is selected to allow a slip fit on to a first end of an extension tube, the first drive cup has a first means to rotationally secure the extension tube and drive when in use;
• k) The extension tube has a second end opposing the first end, where the second end of the extension tube is adapted to receive a second drive cup, the second drive cup is slip fit onto the second end of the extension tube, a second means to secure the second drive cup, to the second end of the extension tube, a third retaining nut rotatably secures the third retainer plate by tightly bearing against a grommet and the third retainer plate, the second drive cup is essentially cup-shaped, having elongated sides terminating in a plurality of cutting teeth, the second drive cup also has a base, where the base has a centrally threaded hole defined therein allowing the second drive cup to threadably engage a threaded portion of a drive coupling arbor, securing the second drive cup and prevents adverse rotational and translational movement when in use, the second drive cup is sized specifically to provide a tight friction fit onto the extension tube;
• l) The drive coupling arbor has a third retainer plate, the third retainer plate has a centrally located clearance hole defined therein, and is slideably positioned on the first portion of the drive coupling arbor;
• m) the base of the second drive cup has two cylindrical cutouts defined therein, and are positionally aligned with corresponding cylindrical bosses on the retainer plate rotationally securing the second drive cup onto the coupling arbor when the cylindrical retainer plate is slidably moved to causing the cylindrical bosses on the retainer plate to engage the cylindrical cutouts in the base of the drive cup, a third retaining nut rotatably secures the third retainer plate by tightly bearing against a grommet and the third retainer plate, the threaded portion of the drive coupling arbor having a central hexagonal hole defined therein allowing a hexagonal shank to be press fit into the central hexagonal hole, the hexagonal shank may be attached to a drill chuck;
• and
• n) the second drive cup provides rotational motion from a drive device to the extension tube causing the first drive cup to rotate thereby causing the first hole saw to cut through a beam or soffit.