Drill bit extension

Details Drill bit extension Drill bit extension

1974-03-29

1978-02-28

Gilden, Leon

Cutting by use of rotating axially moving tool

Tool or tool with support

Including detailed shank

408239A, B23B 3144

Patent

active

040764443

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.

REFERENCES:
patent: 1225209 (1917-05-01), Beaulieu
patent: 2110202 (1938-03-01), Crane
patent: 2752965 (1956-07-01), Mackey
patent: 3073633 (1963-01-01), Jeffs
patent: 3797865 (1974-03-01), Ballentine

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