Screen basket having a removable and replaceable cylindrical mesh liner

A screen basket for removing contaminants from an aqueous papermaking stock, said screen basket comprising:

• an upper support ring that includes an upper circular anchor channel and a plurality of circumferentially arranged longitudinal upper threaded apertures;
• a lower support ring that includes a lower circular anchor channel and a plurality of circumferentially arranged longitudinal lower threaded apertures each of which is coaxial with an associated one of said plurality of longitudinal upper threaded apertures;
• a support ring having a plurality of circumferentially arranged middle apertures each uniquely associated with one of said upper threaded apertures and one of said lower threaded apertures;
• a removable and replaceable cylindrical mesh liner having an upper anchor that engageably seats in said upper circular anchor channel and a lower anchor that engageably seats in said lower circular anchor channel;
• and
• a plurality of support rods each of which passes through an associated one of said longitudinal lower and upper threaded apertures and said middle apertures, wherein each rod includes first and second threaded ends that are oppositely threaded, said support rods extending between said support rings to engage said anchors to said channels upon rotation in one direction, and disengage said anchors from said anchor channels upon rotation in an opposite direction.