Cellar door

Claim 1

IN A METALLIC CELLAR DOOR CONSTRUCTION, THE COMBINATION OF SIMILAR LEFT AND RIGHT-HAND SHEET METAL SIDE FRAME MEMBERS EACH COMPRISING A NARROW LONGITUDINALLY EXTENDING TOP WALL INCLINED FROM THE HORIZONTAL AND PROVIDED WITH AN UPRIGHT LONGITUDINAL FLANGE, A TRANSVERSE SHEET METAL TOP FRAME MEMBER CONNECTED BETWEEN SAID LEFT AND RIGHT-HAND FRAME MEMBERS AT UPPER END PORTIONS OF THEIR TOP WALLS, A GENERALLY RECTANGULAR LEFT-HAND SHEET METAL DOOR PROVIDED WITH A DEPENDING MARGINAL FLANGE WHICH IS DISPOSED OUTWARDLY OF AND WHICH EXTENDS LONGITUDINALLY IN SPACED PARALLEL RELATIONSHIP WITH SAID UPRIGHT FLANGE ON SAID LEFT-HAND SIDE FRAME MEMBER WHEN THE DOOR IS IN A CLOSED POSITION, A GENERALLY RECTANGULAR RIGHT-HAND SHEET METAL DOOR PROVIDED WITH A DEPENDING MARGINAL FLANGE WHICH IS DISPOSED OUTWARDLY OF AND WHICH EXTENDS LONGITUDINALLY IN SPACED PARALLEL RELATIONSHIP WITH SAID UPRIGHT FLANGE ON SAID RIGHT-HAND SIDE FRAME MEMBER WHEN THE DOOR IS IN A CLOSED POSITION, AND SIMILAR LEFT AND RIGHTHAND HINGE AND SPRING ASSEMBLIES RESPECTIVELY SWINGABLY CONNECTING SAID LEFT AND RIGHT-HAND DOORS WITH SAID LEFT AND RIGHT-HAND SIDE FRAME MEMBERS AND BIASING SAID DOORS TOWARD OPEN POSITIONS, SAID LEFT AND RIGHT-HAND HINGE AND SPRING ASSEMBLIES BEING WHOLLY DISPOSED RESPECTIVELY WITHIN THE SPACES BETWEEN SAID UPRIGHT LONGITUDINAL FLANGES ON SAID SIDE FRAME MEMBERS AND THE ASSOCIATED DEPENDING DOOR FLANGES AND EACH COMPRISING UPPER AND LOWER HINGES AND AT LEAST ONE ELONGATED TORSION SPRING WHICH IS CONNECTED AT OPPOSITE ENDS TO THE ADJACENT DOOR AND SIDE FRAME MEMBER.