Helicopter rotor blade securement device

Details Helicopter rotor blade securement device Helicopter rotor blade securement device

1985-09-19

1986-11-18

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Working member foldable, pivotable or collapsible to non-use...

Member movement in rotation plane

244 7A, B64C 2750

Patent

active

046233008

ABSTRACT:
Folded helicopter blades are secured against undesirable motion by a device that attaches to a receptacle in the underside of each blade. The device comprises a pin for engaging the receptacle, a spherical bearing disposed about the pin, an annular housing disposed about the bearing and including two diametrically opposed recesses therein, a primary strut attached at one end to the fuselage and at the other end to a clevis-type yoke, wherein the yoke ends are pivotally attached to the housing within the recesses, a secondary strut attached at one end to the fuselage and attached at the other end to the primary strut near the yoke. This arrangement forms a three bar linkage.

REFERENCES:
patent: 2110443 (1938-03-01), Larsen et al.
patent: 2220109 (1940-11-01), Larsen
patent: 2405777 (1946-08-01), Buivid
patent: 2538082 (1951-01-01), Buivid
patent: 2549886 (1951-04-01), Buivid
patent: 2679364 (1954-05-01), Pesaro
patent: 2981339 (1961-04-01), Kaplan
patent: 3112088 (1963-11-01), Speechley
patent: 3133715 (1964-05-01), Grunfelder
patent: 4268222 (1981-05-01), Bernard

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