Patent ID: 8418593

Claim:
A deformable disc ( 56 ; 156 ; 256 ) which is to be fitted to the bottom of a missile container ( 15 ) and is capable of opening under the thrust of the propulsion gases of a missile ( 16 ) contained in the container and of closing again after the missile has been ejected, the disc comprising a grid ( 62 ) and a stack of resilient plates ( 63 ; 163 ; 263 ) which are clamped between at least one heat protection membrane and a sealing membrane, upstream and downstream ( 70 , 71 , 72 , 73 ), and held between an upstream bearing frame ( 61 ) and a downstream bearing frame ( 64 ), characterised in that the downstream bearing frame has an inside edge ( 80 ) which is extended in the downstream direction and is profiled so that it comprises a convex upstream portion ( 90 ) and a straight or concave downstream portion ( 91 ) capable of shaping a free end ( 96 ) of each resilient plate ( 63 ), so as to provide the disc with stop means defining a position of maximum deformation of the resilient plates, ensuring that the material constituting the plates ( 63 ; 163 ; 263 ) retains its mechanical resilience properties.