Abstract: The knife sharpener is comprised of a pair of cutting wheels carried for rotation by a supporting block. Each cutting wheel is rotatably journaled on an axle. Each axle has a bore extending therethrough. A fastener passes through the bores to secure the axles to the supporting block. At least one of the bores is eccentrically disposed within its axle. Rotation of the axle having the eccentric bore moves the rotational axis of the cutting wheel journaled thereon to adjust the clearance between the cutting wheels.

Abstract: A self-priming centrifugal pump includes a housing having an inverted frusto-conically shaped lower portion. A centrifugal impeller is suspended from the shaft of a motor mounted in the top portion of the housing. The centrifugal impeller includes a solids collector member removably attached to its lower end. A cylindrical inlet tube, integral with the frusto-conically shaped lower housing portion, extends into the interior of the centrifugal impeller through an opening in the lower end of the solids collector member. An inverted dish shaped impeller member is located above the centrifugal impeller and directs and impels fluid pumped by the centrifugal impeller toward a plurality of efflux ports located in the pump housing. The centrifugal impeller includes an air hole in the conical wall thereof to allow air to escape as the pump is priming.