A SIEVE SET

Claims

A vibrating screening machine includes replaceable screen assemblies. Compression mechanisms are used to attach the replaceable screen assemblies to the vibrating screening machine. Each compression mechanism applies a force to a replaceable screen assembly that includes both a horizontal and a downward vertical component. Each replaceable screen assembly is typically substantially flat before installation on a vibrating screening machine. The force applied to a screen assembly by one or more compression mechanisms causes the screen assembly to be pushed into place against the underlying concave support members, so that the screen assembly itself assumes a concave shape with the center of the assembly lower than the side edges. The downward vertical component of the force helps to secure the screen assembly to the screening machine.