A hinge assembly includes a first frame member having two spaced-apart portions with a first pair of opposing cam slots defining a first cam path. A second frame member has two spaced-apart portions with a second pair of opposing cam slots defining a second cam path and a second cam pin in the second pair of opposing cam slots. A first cam pin is in the first pair of opposing cam slots and moves along the pin cam path. A second cam pin is in the second pair of opposing cam slots and moves along the second cam path. The frame members are configured to move between a closed position and an open position as the first and second cam pins move in the respective first and second cam paths when the first and second frame members are rotated between the closed position and the open position.