Slatted device for stable floors. The device is suitable for being installed as a separation between the waste pits and stable compartments of stabled animals. This device comprises a chassis (2) and a movable trap door (3) with a plurality of openings (6). Trap door (3) rests on chassis (2). The device is characterised in that between chassis (2) and trap door (3) sliding hinge means (11) are provided, so that through these sliding hinge means (11), trap door (3) can swing and move with respect to chassis (2) to a position in which trap door (3) can be inserted into said pit (15).