Patent ID: 7721896

Claim:
Screen separating apparatus comprising a chassis for supporting a screen frame carrying a sieve screen, said chassis providing a first bearing surface; at least one second bearing surface opposed to said first bearing surface such that the screen frame can be clamped between the first and second bearing surfaces; at least one expandable element mountable in the chassis to be between said first and second bearing surfaces and arranged to expand in a direction transverse to said bearing surfaces, so as thereby to exert a force in a direction transverse to the bearing surfaces that effects said clamping of the screen frame; and one or more clamping members the or each of which is movable between a non-deployed position, in which said screen frame can be lifted in said transverse direction away from said first bearing surface for removal from the chassis, and a deployed position, in which the clamping member is located relative to the chassis to provide said second bearing surface or one of a combination of said second bearing surfaces.