Arrangement for securing a panel closure

A closure comprising:

• (a) a frame defining an opening, said frame comprising a hinge jamb, a strike jamb, a lintel and a threshold;
• (b) a panel mounted via a hinge relative to said hinge jamb, said panel assuming a closed position in which said panel abuts a primary abutment surface of said hinge jamb and a primary abutment surface of another frame edge selected from said strike jamb, said lintel and said threshold, said panel providing an at least partial closure for said opening, said panel being hingedly movable towards a swing-side of said opening to an open position in which said opening is substantially unobscured, said primary abutment surfaces of said hinge jamb and said other frame edge being deployed to oppose forces tending to displace said panel away from said swing-side of said opening, said panel including a hinge-side extension extending beyond said hinge so as to close against a secondary abutment surface of said hinge jamb located in a recess of said hinge jamb and oriented to oppose forces tending to displace said panel towards said swing-side of said opening as said panel is brought into said closed state;
• and
• (c) a compression member retractably mounted relative to said other frame edge so as to be displaceable when said panel assumes said closed position between an engaged state in which said compression member is disposed between an abutment surface of said panel and a secondary abutment surface of said other frame edge oriented to oppose forces tending to displace said panel towards said swing-side of said opening, and a disengaged state in which said compression member is displaced so as to allow hinged motion of said panel towards said open position, said compression member being biased from said disengaged state towards said engaged state, and being deployed such that, when said panel is swung from said open position towards said closed position, said compression member is temporarily displaced towards said disengaged state and then returns to said engaged state to lock said panel in said closed position,
• wherein said panel abutment surface, said compression member and said secondary abutment surface of said other frame edge are configured such that, when said compression member assumes said engaged state, forces acting on said compression member are primarily compressive forces,
• and wherein said panel, said hinge jamb and said other frame edge are formed with complementary interlocking features configured to oppose motion of edges of said panel towards a center of said panel when said panel is in said closed position, wherein said complementary interlocking features include a plurality of projecting pins extending into the recess of said hinge jamb and interlocking with corresponding apertures when said panel is in said closed position, said projecting pins projecting in a direction substantially perpendicular to a plane of said opening.