Torsion rod isolator

A hinge assembly comprising:

• a first hinge member fixedly attached to a closure member and movably attached to a structure defining an opening, the first hinge member being disposed proximate a first end of the opening;
• a second hinge member fixedly attached to the closure member and movably attached to the structure, the second hinge member being disposed proximate a second end of the opening;
• a first torsion rod having a first end attached to the first hinge member for movement therewith and a second end fixed relative to the structure proximate the second hinge member;
• a second torsion rod having a first end attached to the second hinge member for movement therewith and a second end fixed relative to the structure proximate the first hinge member;
• and
• a sleeve attached to the first torsion rod and including an outer surface having a profile defining a plurality of peaks and valleys, the outer surface contacting the second torsion bar to prevent direct contact between the first and second torsion rods,
• wherein a cross section of the sleeve includes the plurality of peaks and valleys, the cross section defined by a plane that is perpendicular to a longitudinal axis of the first torsion rod.