| 摘要 |
<p>A mechanism for controlling the pitch changes in helicopter blades (3) with respect to the helicopter mast (27), which is connected to a lever assembly mounted in the structure and comprising a pair of command arms (31,39) and first and second bars (22,33), related by rocker arms (29,34), for the selective transmission of cyclic and collective pitches. The first bar (22) is coaxially arranged with respect to a bush (42) linked to a third transversal bar (39') and the first bar (22) has, at an intermediate point, a third rocker arm (34a) at whose ends are articulated vertical connecting rods (37) which selectively transmit the pitches to a blade positioning mechanism (43), from which connecting rods (8a) engaging the blades (3) extend through a tubular mast (27). <IMAGE></p> |
