Helicopter blade folding system

Details Helicopter blade folding system Helicopter blade folding system

1978-10-10

1981-02-24

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

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

Member movement in rotation plane

416221, B64C 2750

Patent

active

042525047

ABSTRACT:
An apparatus is disclosed for folding a helicopter rotor blade (16) for storage. The blade (16) is secured to a grip (12) by blade bolts (18, 20) which are locked in place by a latch plate (22). Each bolt (18, 20) has an annular groove (30, 31) in which is mated a corresponding aperture (42, 46) in the latch plate (22). To fold the blade (16) the latch plate (22) is translated against the tension of spring (24) to expose a blade bolt (18) to an enlarged aperture (40). This bolt (18) can then be removed to permit pivoting of the blade (16) about the remaining bolt (20). To further secure the latch plate (22), a cap (54) is provided to lock the latch plate (22) to the blade bolt (18).

REFERENCES:
patent: 2023840 (1935-12-01), Kay et al.
patent: 2967726 (1961-01-01), Weston
patent: 3125164 (1964-03-01), Merrell
patent: 3135333 (1964-06-01), Cruz et al.
patent: 3158203 (1964-11-01), Grunfelder
patent: 3749515 (1971-06-01), Covington et al.

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