A materials handling device comprising a cascade of vibrating conveyors (61, 71, 81), each upstream conveyor (61, 71) being nestable in an adjacent downstream conveyor (71, 81) with clearance, and at least one of any two adjacent conveyors being movable relative to the other conveyor from a nested condition in which product is conveyed from the upstream conveyor to the adjacent downstream conveyor to a separated condition in which product falls from the upstream conveyor into a gap formed between the upstream and downstream conveyors. The invention avoids mechanical gates which are noisy, unreliable and are liable to trap the product being conveyed.