Abstract: A shaft coupling assembly comprising a coupling element including a shaft-receiving slot configured to receive a shaft. A retaining bolt is extendable through the coupling element adjacent the shaft receiving slot and to be received and retained in a bolt receiving recess in the upper shaft surface adjacent the forward shaft end after the shaft forward end is inserted in the coupling element slot. At least one projection extends from the shaft forward end adjacent the shaft upper surface to prevent improper clamping of the shaft forward end and any associated feeling of proper interconnection.

Abstract: An apparatus for mixing and dispensing an influent slurry into a tank. The apparatus may include a body having a sidewall and floor which together define a volume for the slurry to pass through. Fixed baffles and rotating paddles may be disposed within the body in an interleaved manner to promote mixing of the slurry with a flocculating reagent. The apparatus may also include scrapers for reducing built-up floc on the walls and/or floor of the apparatus. The floor of the apparatus may define a constricted opening for discharge of the slurry. The constricted opening, which serves to control the flow of the slurry through the body of the apparatus, also helps to increase mixing time of the slurry with the flocculating reagent. The constricted opening may be configured as an annular or ring-shaped port.

Abstract: A shaft coupling assembly comprising a coupling element including a shaft-receiving slot configured to receive a shaft. A retaining bolt is extendable through the coupling element adjacent the shaft receiving slot and to be received and retained in a bolt receiving recess in the upper shaft surface adjacent the forward shaft end after the shaft forward end is inserted in the coupling element slot. At least one projection extends from the shaft forward end adjacent the shaft upper surface to prevent improper clamping of the shaft forward end and any associated feeling of proper interconnection.

Abstract: A method of forming cellular rigid pavement utilizing a planar orthogonal matrix of upwardly convex domed forms over which concrete is poured to create a corresponding matrix of voids within the concrete around which downward loads are distributed and which minimizes pavement warpage and concrete volume, and a panel of such domed forms used in practicing the method.