An Envoy Airlines Embraer ERJ-145, registration N905JH performing flight AA-3594 from Chicago O'Hare,IL to Detroit,MI (USA) with 43 people on board, was in the initial climb out of O'Hare's runway 09R when the crew declared emergency reporting a landing gear malfunction with the nose gear. The aircraft stopped the climb at 5000 feet, the crew requested a low approach to have the gear inspected from the ground and advised they'd be needed to be towed off the runway. ATC advised the crew to expect runway 09L for the low approach and 10L for landing. Following the low approach tower as well as the crew of another aircraft looking at the landing gear reported all three gear appeared to be down. The aircraft climbed back to 5000 feet, positioned for the approach to runway 10L and landed safely about 40 minutes after departure. About 15 minutes after landing the aircraft was towed to the apron.