| 摘要 |
<p>A means for folding a helicopter rotor blade includes a generally chordwise hinge located intermediate the root and tip ends of the blade, the outboard portion of the blade being rotatable about the hinge to a folded position in which it overlaps the inboard portion of the blade along at least part of its length. The hinge is formed in a generally cylindrical hollow member of aerofoil shape having leading and trailing sections and a rotatable central section. The inboard portion is secured to the leading and trailing sections, and the outboard portion is secured to the rotatable central section. A motor located in the hollow hinge, acting through a spline connection, rotates the central section relative to the leading and trailing sections. An arm formed integral with the central section abuts a surface formed in the inboard portion of the rotor blade adjacent the hinge when the outboard portion of the rotor blade is in its fully extended position. The hinge is locked and unlocked by a ram which, when extended, locates through mating holes in the arm and the abutting surface.</p> |
