US Patent 11093008 Synchronized dual shaft expandable hinge

A portable information handling system housing rotationally couples first and second housing portions with a hinge assembly having first and second axles held in a parallel fixed lateral disposition by interaction of a gear chassis, a drive carriage and an idler assembly. The first and second axles expand to increase the distance between the first and second housing portions in the event that the housing portions close over an object disposed between them. The idler assembly couples to the gear chassis and drive carriage to rotate with the second axle as it moves relative to the first axle.