US Patent 7752938 Concentric double axis mechanism having bevel gears

In a concentric double axis mechanism (1); a driving bevel gear (7) is placed concentrically with and freely from any interference with an axis-A (3), a follower bevel gear (8) is meshed with the driving bevel gear (7), and an axis-B (9) is concentrically connected and fixed to the follower bevel gear (8). Since the driving bevel gear (7) is driven by the axis-B actuator (12) that is independent from the axis-A actuator (11), the axis-B (9) can be driven being free from any interference with the axis-A (3). The axis-A actuator (11) does not become a load for the axis-B actuator (12), nor does the axis-B actuator (12) become a load for the axis-A actuator (11).