Device of retractable stops for rotor blades of giroplanes, and

Details Device of retractable stops for rotor blades of giroplanes, and Device of retractable stops for rotor blades of giroplanes, and

1990-06-05

1992-05-26

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Sustained ancillary movement of rotary working member

Lead-lag type rotor blade movement

416134A, 416140, 416164, 416106, B64C 2751

Patent

active

051162091

ABSTRACT:
A device of retractable stops for the blades of articulated rotors for giroplanes, which includes a stationary stop 20 with a finger 22 radially converging towards the exterior and externally radially protruding on the external spar 9 of the articulation means 7 of each blade on the hub 3, as well as a movable stop 21 with a receptacle 36 resiliently returned by a return device 45 in a position fit around the finger, but disengaged from the finger by centrifugal force when the rotation speed of the blades is higher than a set value. The invention therefore provides absolute stops in flapping and drag in the "ground" position and sharp stops in the flight position. One advantageous application is for helicopter rotors.

REFERENCES:
patent: 4235570 (1980-11-01), Ferris et al.
patent: 4516909 (1985-05-01), Caramaschi et al.
patent: 4551067 (1985-11-01), Caramaschi et al.
patent: 4652210 (1987-03-01), Leman et al.
patent: 4732540 (1988-03-01), Mouille et al.

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