Robert Kennedy Shoemaker

US Patent:

42513529, Feb 17, 1981

Filed:

Dec 28, 1979

Appl. No.:

6/107809

Inventors:

Robert S. Shoemaker - Burlingame CA

Assignee:

Bechtel International Corporation - San Francisco CA

International Classification:

B03B 502
C22B 302

US Classification:

209 45

Abstract:

An improvement in the screen circumscribing or partially circumscribing the rim of an agitation tank is disclosed. A screen substantially impermeable to the charcoal is provided which is inclined inwardly at an angle between about 35. degree. and 55. degree. from vertical. The metal-bearing charcoal adhering to the screen is readily washed from the screen by the rolling motion of the mixture in the tank.

US Patent:

40183963, Apr 19, 1977

Filed:

May 5, 1975

Appl. No.:

5/574217

Inventors:

Robert S. Shoemaker - Millbrae CA
Donald H. Moyer - El Cerrito CA
Joseph J. Newman - Orinda CA

Assignee:

Bechtel International Corporation - San Francisco CA

International Classification:

B02C 2300

US Classification:

241301

Abstract:

An improved housing embedded in the ground for use in crushing of ore. The housing has a generally figure eight configuration in plan defined by a pair of hollow, upright cylindrical segments with a common wall between the points of intersection of the segments. One segment houses a dump pocket, an ore crusher, a surge chamber and a discharge feeder and conveyor in descending order, and the other segment contains drive machinery, dust control apparatus, a lubrication system, hoist ways, elevator shaft, and other service facilities. The crusher in the first segment is supported on a floor supported by the wall of the first segment itself. The housing requires only a minimum of concrete and reinforcing steel since the cylindrical configuration of the sections thereof provide the most efficient resistance to lateral pressures resulting from earth backfill and surcharge from heavy haul trucks.