Abstract: This automatic release and ejection locking mechanism for said equipment boxes, notably for aircraft comprises locking balls releasable from their locked condition by means of a piston constantly urged by a coiled compression spring to its release position. The locking means are held against the force of the ejection spring by means of an effort scalingdown device, so that the force to be applied to said device for keeping the locking action may be very moderate and the release can be obtained by reducing or cancelling the low retaining force exerted on the effort scaling-down device, for example by means of electromagnetic release means, in combination or not with a permanent magnet. (FIG.

Abstract: This electromechanical device with a manual emergency control for opening the door of a safety outfit box on board an aircraft comprises in said box a spring-loaded piston responsive to an electromagnet and having a head shaped to control the movements of registering locking members into or out from their locking position in which they engage a retaining hook engageable in turn with a cross member of a strap carried by the door. Said locking members may consist of balls or small ball-bearings engageable in corresponding holes formed in a sleeve concentric to said piston. Manual control means are provided for actuating said piston from the outside and thus opening the door in case of emergency.