Arrangement and equipment for the displacement of blades, particularly propeller blades

Claim 1

In equipment for the adjustment of rotor blades, particularly propeller blades of fans, turbines, and the like, and especially for propulsion plants on aircraft adapted to be selectively shut-off in a low-resistance position, said equipment including a rotor hub with blades pivotally mounted thereon, said blades (20) having a longitudinal axis (L A ) and a twist (Δ.sub.θ) about said axis (L A ) between the chord line (S PF ) at the blade root and the chord line (S PS ) at the blade tip, the improvement comprising means whereby said blades (20) are each selectively pivotal about pivot support means on the hub into an operational or a collapsed position, said blades (20) when collapsed forming, by means of the position of pivot axes (33) of said pivot support means, helical cut-outs of a common cylindrical or conical envelope with the longitudinal axes (L A ) extending at a slant imparted by the twist (Δ.sub.θ) with respect to the longitudinal direction of said envelope, the position of the pivot axes (33) at a common base circle being determined by the slant of the pivot axes (33) with respect to the plane of rotation (E--E) of said blades (20) and by the slant of the axes (33) with respect to the chord line (S PF ) at the blade root.