The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 1985
Filed:
May. 02, 1983
Ralph B Haymore, Salt Lake City, UT (US);
Heinz W Winter, Salt Lake City, UT (US);
Envirotech Corporation, Salt Lake City, UT (US);
Abstract
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. The rakes, rake arms (17) and various torque members (14) and drive members (16) are attached to the movable column and are raised in unison by the take-up action of the cable ends by the drum. Spaced vertically extending multiple keys (60) and keyways (51) are affixed to facing surfaces of the fixed and movable column and the multiple sheave assemblies are positioned between the spaced keys and keyways.