US Patent 7526894 Door and method of manufacturing

A door can comprise first and second panel sections for mounting to a doorframe for pivoting about an upright door pivot axis. A hinge for coupling the door to the door frame can comprise a spine with an elongated passageway comprising first and second hinge receiving pocket portions. First and second cam members and a biasing spring can be mounted within the hinge receiving pocket portions of the elongated passageway. Upon pivoting of the door about the pivot axis to an open position, the first and second cam members are pivoted relative to one another to create a gap therebetween with the biasing spring urging the first cam member toward the second cam member to urge the door closed following pivoting of the door to the open position.