US Patent 7478659 Sticker weight pressurizer for wheels

A sticker weight pressurizer includes a base plate, a hanger which protrudes upwards from a center portion of the base plate, double-acting cylinders which are disposed on the base plate on opposite sides of the hanger, a pressure block on one end of a piston rod of each of the double-acting cylinders, a regulator valve which adjusts pressure of compressed air supplied from a pneumatic pressure source, and a direction control valve which transfers pressure, supplied from the regulator valve, to the double-acting cylinders while controlling the direction of the pressure.