Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Including movement limit stop or damping means
Reexamination Certificate
2006-09-11
2010-06-29
Look, Edward (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Including movement limit stop or damping means
C416S107000, C416S143000
Reexamination Certificate
active
07744349
ABSTRACT:
In the absence of centrifugal force produced during rotation of helicopter blades, damage may result if a blade is rotated upward by wind or other forces. Lock units removably appended between the rotor assembly and each blade pitch housing attached to a helicopter blade are usable to restrict upward rotation. A base portion of a lock unit may be configured to be held in position by a removable pin device. An extendible device extending from the base portion to a surface of a blade pitch housing can be adjusted to press the base portion back against a surface of the rotor assembly. The lock unit thereby restricts these surfaces of the blade pitch housing and rotor assembly from moving closer to each other and thereby restricts upward rotation of the blade pitch housing and its attached helicopter blade. The lock units are readily removable in preparation for returning a helicopter to active use.
REFERENCES:
patent: 2906348 (1959-09-01), Lovegrove
patent: 4203708 (1980-05-01), Rybicki
patent: 4289448 (1981-09-01), Declerco et al.
patent: 5951252 (1999-09-01), Muylaert
patent: 6309182 (2001-10-01), Muylaert
Davis Aircraft Products Co., Inc.
Look Edward
Robinson Kenneth P.
Wiehe Nathaniel
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