Patent ID: 7814621

Claim:
A door hinge comprising: a door wing having first and second door wing flanges substantially orthogonal to each other, said second door wing flange comprising knuckles, said first door wing flange comprised of a first section and a second section, wherein said second section is narrower than said first section; a frame wing pivotally connected to said door wing, said frame wing comprised of a first frame wing flange, a second frame wing flange substantially orthogonal to said first frame wing flange, and a third frame wing flange substantially orthogonal to said second frame wing flange, said third frame wing flange comprising knuckles; wherein said second frame wing flange comprises an aperture to receive said narrow second section of said first door wing flange when said door hinge is in a closed position; wherein said door wing is pivotally attached to said frame wing via said door wing knuckles on said second door wing flange and said frame wing knuckles on said third frame wing flange; at least one strike or catch connected to said door wing on a door wing flange that does not comprise knuckles; at least one strike or catch attached to a frame wing flange that does not comprise knuckles, whereby said at least one door wing strike or catch is positioned to engage said at least one frame wing strike or catch when said door hinge is in a closed position; wherein said at least one strike is comprised of a ball bearing member seated on a base attached to said wing, and the gap between said second door wing flange and said third frame wing flange is less than half of the outside diameter of the hinge knuckles when said door hinge is in a closed position.