Heinz W Winter
Engineers in Salt Lake City, UT

4624787, Nov 25, 1986

May 6, 1985

6/731172

Ralph B. Haymore - Salt Lake City UT
Heinz W. Winter - Salt Lake City UT

Envirotech Corporation - Menlo Park CA

B01B 2118

210531

A lifting mechanism for a raking structure in a solids-liquid separation tank comprising a fixed column adapted to extend vertically within the tank, a movable column being adapted to support a raking structure for the tank, and a lift device for raising and lowering said movable column telescopically with respect to said fixed column. The lift device includes an elongate flexible tension member; a first series of load points on the fixed column at spaced intervals on the fixed column; and a second series of lift points on the movable column below said first series of points and at spaced intervals on the movable column, the tension member being alternately threaded between load and lift points of said first and second series of points, with the tension member thus being led over one of said load points, down and below one of said lift points and back up and over the next load point. A power driven drum is provided means for selectively pulling and paying out said tension member for drawing the lift points up toward the load points for raising the movable column, and for allowing the lift points to move down away from the load points for lowering the movable column, respectively.

4515694, May 7, 1985

May 2, 1983

6/490741

Ralph B. Haymore - Salt Lake City UT
Heinz W. Winter - Salt Lake City UT

Envirotech Corporation - Salt Lake City UT

B01D 2118

210531

A lifting mechanism for a rake arm and rake structure employed to move sediments settling out from a solids-liquid slurry in a sedimentation tank, includes a fixed center column (27) in the tank and a concentric movable column (28) in telescoping relation to the fixed column. A first series of sheave assemblies (40) are attached to or fixed with respect to the fixed column and a second series of sheave assemblies (51-55) attached to the movable column at a vertically displaced distance from the first series. The respective sheave assemblies may extend in part in an annulus (34) between the fixed and movable columns and are positioned around the peripheries of the respective columns. A continuous cable (45) extends alternately between individual sheaves in each series and the ends of the cable are attached to a vertical take-up drum (38). Rotation of the drum winds up both ends of the cable, shortening the cable spans between the respective series of sheave assemblies thus raising the movable column with respect to the fixed column.