Abstract: A sieve has a rigid outer frame having longitudinally extending side beams and transverse end beams bridging the side beams, at least one cross bar in the frame extending generally parallel to the end beams, a mesh fixed to the cross bar and end beams, and spring elements resiliently supporting the cross bar on the frame for movement relative thereto. A drive reciprocates the outer frame at least generally parallel to the side beams and thereby also moves the cross bar. Thus the spring elements will transmit the movement of the outer frame to the inner cross bar with some delay. The mesh secured to the outer frame and cross bar will therefore be subdivided into panels that will be alternately tightened and slackened for excellent agitation of the material being sifted.

Abstract: The invention relates to a straining apparatus for the separating of solid-liquid mixtures with a downwardly tapering straining basket, the basket inside wall of which has an inclination (.alpha.) increasing from top to bottom, the charging of material to be strained being carried out approximately tangentially at the upper end of the straining basket and the material to be strained flowing downwards helically with radii becoming narrower, the straining basket wall forming at least one helical, inwardly open channel, which is bounded at top and bottom by helical side walls, between which the channel base having straining openings is arranged, the radius of which base decreases from top to bottom and which is inclined with respect to the vertical axis by the angle (.alpha.) in such a way that, in feeding, the inclination is at first small and then increases constantly.