Robert A Dubs

US Patent:

47023244, Oct 27, 1987

Filed:

May 14, 1984

Appl. No.:

6/609857

Inventors:

Dale R. Peinecke - Glenshaw PA
Casimir B. Robak - Newburgh IN
Robert A. Dubs - Rochester PA

Assignee:

Aluminum Company of America - Pittsburgh PA

International Classification:

E21B 1504

US Classification:

173 39

Abstract:

A control system controlling the movements of a pneumatic percussion tool for breaking crust away from anode butts in an electrolysis cell. The system comprises a control arm extending through first and second plates connected to respective first and second valve stems. In a preferred embodiment, the first valve stem operates a hydraulic scissors jack for extending and retracting the tool, and the second valve stem operates a hydraulic rotator motor for radially rotating a mast supporting the tool. A preferred system also comprises a pneumatic control valve connected to the control arm for positioning and energizing the percussion tool.