Abstract: A settling tank having a flat bottom and an inclined side extending from an arcuate corner along one side of said bottom, a drag-out conveyor means along said bottom around said arcuate corner and up said inclined side, and a mechanism for permitting the idler sprocket or roller of the conveyor to move away from said arcuate corner to prevent jamming, as well as to control the thickness and/or to sense the drag of the settlings on the bottom of the tank. This conveyor hold-down control mechanism comprises an adjustable elongated means parallel to said inclined side, pivoted at one end above the normal surface of liquid in said tank, and at the other end to the idler sprockets or rollers for the conveyor at the arcuate corner, for normally resiliently urging said idlers into said corner, as well as indicating when said idlers move away from said corner by encountering foreign objects which otherwise would jam the conveyor.

Abstract: A separator for solid particles from a liquid, such as a dirty industrial machine tool coolant, comprising a settling tank with one or more frames or assemblies of horizontally extending tubular filters and means to removably clamp such frames against a side of the settling tank over suction outlets. Each of the filter frames comprises a chamber into which all of the tubular filters communicate, which chamber is provided with a gasket that is pressed against the vertical wall of the settling tank around an outlet therefrom. Socks may be provided for the tubular filters, which socks may contain seams that are aligned in vertical planes for the easy severance of the cakes of solid particles which build up upon them. A bottom drag out conveyor may be provided for the settling tank and a suction pump draws the liquid through the filters into an adjacent clean tank.