Randall T Fields

US Patent:

52496341, Oct 5, 1993

Filed:

Mar 23, 1992

Appl. No.:

7/855788

Inventors:

John C. Bueter - Fort Wayne IN
Randall T. Fields - Monroeville IN
Martin D. Chandler - Roanoke IN
Frederick W. Neuls - Roanoke IN
Harry P. Laffkas - Fort Wayne IN

Assignee:

Industrial Engineering, Inc. - Fort Wayne IN

International Classification:

E21B 706

US Classification:

173 91

Abstract:

An impact borer having a shell and an air drive within the shell. The air drive includes a ram for reciprocation within the shell and a manifold joined to the shell. The manifold defining an inlet passage delivering air to the air drive and an outlet passage exhausting air from the air drive, and a duplicate passage interconnecting the inlet and outlet passages within the manifold.

US Patent:

51099322, May 5, 1992

Filed:

Dec 10, 1990

Appl. No.:

7/625080

Inventors:

John C. Bueter - Fort Wayne IN
Randall T. Fields - Monroeville IN
Martin D. Chandler - Roanoke IN
Frederick W. Neuls - Roanoke IN
Harry P. Laffkas - Fort Wayne IN

Assignee:

Industrial Engineering, Inc. - Fort Wayne IN

International Classification:

E21B 706

US Classification:

173 17

Abstract:

An impact borer is disclosed for embedding lines and for sinking geothermal wells. The impact borer has a shell, which has a longitudinal bore. An anvil closes one end of the bore. A ram is reciprocally slideable within the bore, against and away from the anvil. The ram divides the bore into front, rear, and ram chambers. A director is joined to the shell. The director is monolithic. The director isolates the front and rear chambers in alternation upon reciprocation of the ram. The director defines an inlet passage communicating with the ram chamber and an outlet passage communicating with the rear chamber.