Patent ID: 9725940
Date: 2017-08-08
CPC Classifications: E05D,E05F,E06B,Y10T

Claim:
1. In a door assembly having a door and a door frame and a door hinge mechanism the improvement comprising: a torsion bar about which the door rotates between an open and a closed position wherein one end of the torsion bar is attached to the door frame so as not to rotate with respect to the door frame and another end of the torsion bar is fixedly attached to the door so as to become twisted as the door is pivoted between open and closed positions, whereby when the door is moved between the closed and open positions the torsion bar twists between the ends thereof so as to build-up potential energy in the torsion bar; and a force adjustment mechanism which releases built-up potential energy in the torsion bar in a controlled manner so as to close the door in a controlled manner, wherein the door hinge mechanism includes a static hinge bracket having a structure defining a central bore one side and a pivotal hinge bracket having structures defining upper and lower bores on one side, the static hinge bracket being attached to the door frame and the pivotal hinge bracket attached to the door, and the central bore of the static hinge bracket axially aligned with and between the upper and lower bores of the pivotal hinge bracket to receive the force adjusting mechanism in the aligned central, upper and lower bores with the torsion bar coupled to and extending outward from one of the upper or lower bores without extending into the central bore, whereby the torsion bar rotates with the pivotal hinge bracket.