Pilot drill with coupon retainer and hot tapping machine using the same
OwnerDonald Weilerinventor
Life of this patent
Estimating the term…
Abstract
Pilot drill with coupon retainer and hot tapping machine using the same that positively retains a coupon cut out by a hole saw. The pilot drill bit has a shank having a driving end for attachment to a drill driver and a cutting end having a cutting edge thereon, the cutting edge being sized to drill a hole of selected diameter through a workpiece, and a movable retaining finger mounted on the shank adjacent the cutting edge, the movable retaining finger having a first position fitting within the cutting diameter of the cutting edge and a second, extended position where a portion thereof lies outside the cutting diameter to retain on the drill shank a workpiece through which the drill bit may have drilled.
Claims23
A pilot drill bit comprising:
- a shank having a driving end for attachment to a drill driver and a cutting end having a cutting edge thereon, the cutting edge being sized to drill a hole of selected diameter through a workpiece;
- a movable retaining finger mounted on the shank adjacent the cutting edge, the movable retaining finger having a first position fitting within the cutting diameter of the cutting edge and a second, extended position where a portion thereof lies outside the cutting diameter to retain on the drill shank a workpiece through which the drill bit may have drilled.
A drill bit comprising:
- a shank having an engagement end to be engaged to rotate the drill bit and a drilling end, a cutting insert of hard material attached to the drilling end, the cutting insert defining the diameter of a hole which can be cut by the drill bit;
- a retaining finger mounted on the shank adjacent the cutting insert, the retaining finger having a first position inside the diameter and a second position extending outside the diameter so that when the drill bit is employed to drill through a workpiece, the retaining finger is retained in its first position during drilling and when the retaining finger passes beyond the workpiece, the retaining finger moves to its second position to retain the workpiece on the drill bit.
A drill bit comprising:
- a shank having an engagement end to be engaged for rotating the drill bit and a drilling end;
- the shank having flats on opposite sides of the shank adjacent the drilling end;
- the shank having a hole through the shank substantially perpendicular to an axis of the drill bit adjacent ends of the flats adjacent the drilling end;
- and,
- a wire extending through the hole and having its ends bent over to fit within the diameter of a hole to be drilled by the drill bit when in a first position, and to extend out to a second position so that at least one wire end extends outside the diameter of a hole to be drilled by the drill bit and to be stopped at the second position by engagement with the ends of flats.
Dependencies are inferred from the claim text.