Patent ID: 7111358

Claim:
A spring biased pivot assembly for operative connection across a lower edge of a self-returning door structure, the pivot assembly comprising: a helical torsion spring held between a first collar member and a second collar member, wherein the first collar member is disposed within an over cover structure adapted to be operatively connected to the lower edge of the door structure, and wherein the second collar member includes a reduced diameter portion adapted to project through a bottom cover, wherein the bottom cover is attached in fixed relation to the over cover structure such that the bottom cover and over cover rotate around a common axis of rotation when the door structure is displaced, the reduced diameter portion of the second collar member having a plurality of radially disposed openings adapted to accept one end of a tension pin such that said one end of the tension pin extends through one of said openings and into engagement with a spindle extending axially through the interior of the second collar with an opposing end of the tension pin projecting outwardly from said reduced diameter portion at a position below the bottom cover, and wherein the bottom cover includes a downwardly depending shoulder structure disposed adjacent to the tension pin; wherein the improvement comprises, an adjustable set screw projecting outwardly from the shoulder structure and towards the outwardly projecting end of the tension pin in tangential relation to the axis of rotation such that the set screw contacts the tension pin when the door structure is in its normal position thereby maintaining separation between the tension pin and the shoulder structure and blocking complete release of spring tension.