Device preventing the simultaneous opening of a plurality of superposed drawers in a common piece of furniture

For use in a cabinet having a plurality of drawers movable from a closed position to a front of the cabinet for opening thereof and toward a rear of the cabinet for closing thereof, a semiautomatic safety mechanism for enabling any one of the drawers to be opened when all the drawers are closed and for enabling only one closed drawer to be opened at a time comprising, a single vertical guide mountable in use vertically inside of a side of the cabinet adjacent to the front of the cabinet, a single rigid safety bar freely slidable vertically in said vertical guide to a terminal raised position and to a terminal lowered position as individual drawers are opened and closed, said safety bar having a plurality of rollers rotatably mounted thereon spaced longitudinally on the safety bar, each drawer having a rigid rail mounted along a side thereof, each drawer other than a lowermost drawer having said rail thereof disposed for coaction with a corresponding roller on said safety bar for activating the safety bar individually to move the safety bar longitudinally upwardly only as individual closed drawers other than said lowermost drawer are opened and for effectively allowing the safety bar to move downwardly under control of the individual rails of said drawers when restored to a closed condition, said rollers being disposed on said safety bar at fixed points of rotation thereon to move upwardly and downwardly with the safety bar to operative positions for effecting cooperation with the corresponding individual rails on the individual drawers for enabling individually the corresponding individual rails to ride on a corresponding roller only one at a time for enabling opening of only one drawer at a time and at said operative positions effectively disenabling the opening of closed drawers other than the drawer corresponding to the enabled individual rail, each rail having a leading end for cooperating with the corresponding roller and configured for lifting of the safety bar progressively as the corresponding drawer is opened and for allowing the safety bar to move downwardly progressively, as the corresponding drawer is closed, said safety bar being disposed at said terminal lowered position when all said drawers are closed and the rollers thereon being disposed effectively enabling any one of all the closed drawers to be opened only one at a time, and the rigid rail of the lowermost drawer being disposed for bearing on a lowermost roller on said safety bar to preclude moving the safety bar upwardly when said lowermost drawer is opened with said safety bar disposed at said terminal lowered position whereby when the lowermost drawer is opened no other drawer can be opened until the lowermost drawer is closed.