Patent ID: 7975433
Filing Date: 2011-07-12
Classification: E05D,E05G,E05Y,Y10T

Abstract:
1. A security door construction, said security door construction having a fully closed position and a fully open position, said security door construction comprising: an offset hinge assembly on one side portion of said security door construction; a door having a top and a bottom, an inside and an outside, a closing edge and being slidably movable in a slide motion between the open position and the closed position, wherein the outside of the door comprises a closed door plane when in the fully closed position; a door frame having a top, a bottom, a closing style and an upright against which said door closes, said upright being located on the opposite side portion of said security door construction from said offset hinge assembly, and a door slot for slidingly receiving said closing edge of said door when said door moves into the closed position and for slidingly releasing said closing edge of said door when said door moves to the open position; wherein said door is mounted behind said door frame on said offset hinge assembly, said offset hinge assembly being located behind said door in a space protected by said door, said offset hinge assembly further comprising: a pair of aligned door hinges fixed to the door, said door hinges having a common door hinge axis, a pair of aligned frame hinges fixed to the frame, said frame hinges have a common frame hinge axis, and a pair of aligned intermediate hinges having a common intermediate hinge axis, at least one link fixing said intermediate hinges, the door hinges and the frame hinges to render the hinges axes mutually parallel, wherein the at least one link allows for the displacement of the door hinges to lie outside the closed door plane when the door is moved to the open position through 180°.