Patent ID: 7347073

Claim:
A rolling mill stand for rolling stock that requires high and low rolling forces, the stand comprising: a frame; a lower working roll in the frame; an upper working roll in the frame above the lower working roll; respective upper and lower backup rolls in the frame respectively bearing downward and upward on the upper and lower working rolls; chocks supporting the backup rolls in the frame; respective upper and lower pairs of telescoping adjusters between the frame and the chocks of the backup rolls, the telescoping adjusters each comprising a large-diameter outer cylinder for the high rolling forces, a large-diameter outer piston in the large-diameter outer cylinder, defining therewith a substantially closed outer annular large-diameter chamber pressurizable to press the large-diameter outer piston in one direction against a bottom of the large-diameter outer cylinder, and in turn defining a concentric small-diameter inner cylinder for the low rolling forces, and a small-diameter inner piston forming in the concentric small-diameter inner cylinder in the large-diameter outer piston with the bottom of the large-diameter outer cylinder a small-diameter first compartment separate from and not a connected to the outer large-diameter chamber and serving to shift the small-diameter inner piston in the small-diameter inner cylinder in a direction opposite the one direction; means including a first pressure-medium fitting extending through the large-diameter outer cylinder and opening into the outer large-diameter chamber for pressurizing the outer large-diameter chamber and pressing the large-diameter outer piston in the one direction against the cylinder bottom; and means including a second pressure-medium fitting extending through the bottom of the large-diameter outer cylinder and opening into the small-diameter first compartment for pressurizing the small-diameter first compartment.