Drill bit extension
OwnerGary L. Siebrechtinventor
Life of this patent
Estimating the term…
Abstract
The drill bit extension which utilized a length of conventional pipe or thin wall conduit without modification. A chuck adapter fitting and a drill bit adapter fitting are located at opposite ends of the pipe. Both have a pilot portion adapted to extend into the pipe, and a threaded tapered portion which engages the pipe interior. The chuck adapter fitting has a reduced shank to be received in a conventional drill chuck; and the drill adapter fitting has an opening with means for locking a drill bit into the fitting. Since the fittings are used with an unmodified pipe, the pipe section can be used in drilling the holes and then left in place after the fittings are removed. In this manner, water lines and electrical conduit may be installed simultaneously with drilling the required holes therefore.
Claims13
A drill bit extension for use with a drill bit comprising, a length of pipe having an unthreaded internal wall of preselected internal pipe size, a drill bit adapter fitting removably mounted in one end of the length of pipe and a chuck adapter fitting removably mounted in the other end of the length of pipe, said adapter fittings each including an externally threaded taper portion tapering from a minor outer diameter no larger than the internal pipe size to a major outer diameter sufficiently larger than the internal pipe size to form a binding fit with the pipe when turning threinto, said adapter fittings each including a pilot portion extending from the minor outer diameter end of the threaded taper portion and having an outer diameter substantially equal to said minor outer diameter and slidable in the pipe to maintain the axis of the respective fitting in alignment with the pipe axis when turning the threaded taper portion into the pipe, the drill bit adapter fitting having chuck means coaxial therewith for receiving the shank of the drill bit, and said chuck adapter fitting having shank means extending axially from the major end of its threaded taper portion for reception in a drill chuck.
A drill bit extension kit for use with a length of pipe having an unthreaded internal wall of preselected internal pipe size to form a drill bit extension comprising, a drill bit adapter fitting adapted to be removably mounted on one end of the length of pipe and a chuck adapter fitting adapter to be mounted on the other end of the length of pipe, said adapter fittings each including an externally threaded taper portion, tapering from a minor outer diameter at one end to a major outer diameter at the other end, said adapter fittings each including a pilot portion extending from said one end of the respective threaded taper portion and having an outer diameter substantially equal to said minor outer diameter of the taper threaded portion, said adapter fittings each having a non-circular head at said other end of said threaded taper portion for receiving a tool for turning the respective adapter fitting into a length of pipe, said drill bit adapter fitting having an axial socket at the end remote from its pilot portion for receiving a drill bit shank, and said chuck adapter fitting having a shank extending axially from the end remote from its pilot portion for reception in a drill chuck.
Dependencies are inferred from the claim text.