CHARLES A SCHACHT
Engineers in Pittsburgh, PA

4415425, Nov 15, 1983

Mar 15, 1982

6/358078

Charles A. Schacht - Pittsburgh PA

United States Steel Corporation - Pittsburgh PA

C01B 2130, C25D 1700

204279

Conductor rolls used for masking one face of a metal strip while electro-treating the other face thereof, comprise an elastomeric-covered cylinder having a metallic contact ring in the center thereof for electrical contact with the strip being treated. To minimize high transfer current densities, the edges of these contact rings have been provided with a cantilevered flange overlying a portion of the elastomer. It has been found, due to differential thermal expansion, at operating temperature, of both the elastomer and the metal contact ring, that the cantilevered flange section of the contact ring is forced up to an excessive extent, resulting in high bending stresses generated in the strip at the region of the contact ring-elastomer interface. By providing a taper on the cantilever flange section to compensate for the difference in thermal expansion, bending stresses in the strip are reduced to insignificant values, thereby eliminating creases and scratches in the strip.

4320582, Mar 23, 1982

Apr 28, 1980

6/144156

Karl H. Klippstein - Pittsburgh PA
Joseph Sawdai - Pittsburgh PA
Charles A. Schacht - Pittsburgh PA
Charles G. Schilling - Murrysville PA

United States Steel Corporation - Pittsburgh PA

F26B 2516

34 39

A Yankee Dryer used in drying a web of paper or like materials in which all structural components are fabricated of weldments of steel plate and forgings and in which the outer shell is formed of a weldment of steel plates expanded to roundness and machined to final dimensions. All primary welds are subject to X-ray inspection. The dryer is of lighter weight than the usual cast iron Yankee Dryers, yet designed to withstand substantially higher steam pressure within the shell.