Abstract: A protective enclosure for building openings such as windows and doorways wherein the protective enclosure comprises a peripheral frame member that circumscribes the openings and pivotally mounts a transparent shielding unit. The unit which may function as a window or door, depending upon the application, is provided with a unique hinge and locking arrangement which facilitates the easy opening and closing of the unit with respect to the opening; yet one which provides security against the unauthorized entry through the opening in that the unit may not be removed from the building opening from the outside of the building when the unit is in a closed position.

Abstract: A tamper resistant fastener comprising a screw having a shank portion on which a left-handed threaded surface is disposed and a head portion of a circular contour, the upper surface of which is provided with a circular bore at a location which is eccentrically disposed with respect to the longitudinal axis of the shank portion of the screw. A retainer member having a step bore that is so sized as to receive the screw such that the head portion of the screw is below the outer edge of the smaller diametered portion of the step bore.

Abstract: A casement covering comprising a metal frame rigidly secured to glazing, the glazing being substantially shatter resistant, and means securing the apparatus to a casement comprising fasteners that cannot be removed by an ordinary screwdriver.