Patent ID: 6177020
Filing Date: 2001-01-23
Classification: B01D,E02B

Abstract:
A stepping screen assembly interposed in a liquid waste stream for collecting and disposing of solid matter in the waste stream, the assembly comprising:(a) an upwardly inclined grid structure containing multiple parallel alternating static and dynamic bars horizontally spaced apart, the bars each having multiple vertically and equally spaced apart shelves at a right angle to the vertical axis of the bar, each dynamic bar having multiple vertically spaced apart spacers attached to a first and second side surface;(b) an outer frame adjacent a first and second side surface of the grid structure;(c) the outer frame enclosing a pair of pneumatic cylinders on both the first and second exterior side surface of the grid structure;(d) a first pneumatic cylinder on each side surface of the grid structure attached to a vertical shaft, the vertical shaft attached to a top and bottom mounting plate supporting the dynamic bars and causing the dynamic bars to move up and down vertically;(e) a second pneumatic cylinder on each side attached to a vertical rod supporting a pair of bell cranks on each side, the pair of bell cranks on each side attached to the vertical shaft causing the dynamic bars to move forward and back horizontally; and(f) the dynamic bar movement causing the solid matter in the liquid waste stream to be lifted upwardly on the shelves to a top most level from which the solid matter falls by gravity to a means for disposing of the solid matter.