Ronald W Arntzen

US Patent:

52991059, Mar 29, 1994

Filed:

Mar 8, 1993

Appl. No.:

8/031097

Inventors:

Ronald W. Arntzen - Ketchikan AK

International Classification:

B25B 2318

US Classification:

362119

Abstract:

A new and improved broken tap extraction apparatus for a broken tap in a material undergoing thread tapping, wherein the broken tap has thread cutting portions and has noncutting portions located between the cutting portions. The broken tap extraction apparatus of the invention includes a head portion adapted to receive a torque applying tool, a shank portion connected to the head portion, and at least two tap engaging portions projecting from the shank portion. The shank portion receives torque applied at the head portion and transmits the torque to the tap engaging portions that project from the shank portion. The tap engaging portions engage the noncutting portions of the tap, such that when torque is applied to the head portion, the torque is transmitted to the tap engaging portions for exerting the torque against the noncutting portions of the broken tap for turning the broken tap out of the material undergoing tapping. In addition, the head portion and the shank portion may include a first internal channel adapted to receive an optical fiber which receives light from a light source. Also, the head portion and the shank portion may include a second internal channel adapted to receive lubricating oil and to convey the received oil toward the broken tap.