Patent ID: 8196751

Claim:
A permanent magnet drum separator for removal of a ferrous fraction from a material stream comprising: a rotatable outer shell having tubular shape with a circular cross section; a pickup magnet that is a rare earth permanent magnet positioned on a hinge plate within said rotatable outer shell; a carry magnet housed within said rotatable outer shell, said carry magnet positioned at a fixed location within said rotatable outer shell near the inside circumference of said rotatable outer shell; and said hinge plate having a first end attached to hinge and a second end attached to a movable element, said hinge positioned at a fixed location within said rotatable outer shell near the inside circumference of said rotatable outer shell, said movable element able to move said pickup magnet about said hinge to vary the distance between said pickup magnet and the inside circumference of said rotatable outer shell by moving said pickup magnet closer to the center of said rotatable outer shell.