Patent ID: 7934350

Claim:
A security screen comprising a frame having an outer edge which defines an outer perimeter of the frame and further having an inner edge which surrounds an open portion of the frame, the outer edge of the frame being dimensioned such that in use the security screen is receivable across an opening to close the opening, a perforate sheet element being dimensioned to be received in the open portion of the frame to close the open portion; the edge of the perforate sheet element being formed with a lip extending transversely from one face of the perforate sheet element, the inner edge of the frame formed with a recess having an entry extending across at least a portion of the width of the inner edge, the recess extending a first length along the inner edge, the recess having two opposed side faces each extending from the inner edge, the inner portion of the recess having a zone which extends transversely from the one side face in opposed relation to the other side face, the other side face comprising a proximal end adjacent the inner edge and a distal end defining said first length therebetween, the zone defined at least in part by an outermost side wall which extends transversely from the one side face, the edge of the perforate sheet element received within the recess such that the lip is located within the zone and the one face of the perforate sheet element adjacent the lip overlies the one side face, a locking member fixed within the recess between the other face of the perforate sheet element and the other side face of the recess to close the space between the perforate sheet element and the other side face and to retain the lip within the zone to lie adjacent the outermost side wall which prevents movement of the lip from the zone towards the inner edge, said locking member comprising a second length substantially equal to the first length and being arranged and configured to clamp the perforate sheet material against the said side face at least in part through the inter-engagement of complementary formations provided on the opposed face of the recess and an opposed face of the locking member, said complementary formations comprising of serrated-like or corrugated-like configurations.