In one embodiment a hinge assembly comprises a first hinge pin rotatable about a first axis, a first gear coupled to the first hinge pin and rotatable about the first axis, a second hinge pin rotatable about a second axis substantially parallel to the first axis, a second gear coupled to the second hinge pin and rotatable about the second axis, at least one connecting member to be coupled to the first hinge pin and the second hinge pin to hold the first hinge pin at a fixed distance from the second hinge pin such that the first gear is engaged with the second gear. At least one of the first gear or the second gear comprises a variable radius. Other embodiments may be described.