Optics: measuring and testing – Angle measuring or angular axial alignment
Patent
1981-08-13
1983-12-27
Punter, William H.
Optics: measuring and testing
Angle measuring or angular axial alignment
33286, G01B 1126
Patent
active
044227574
ABSTRACT:
The lead-lag angle or phasing of a rotor blade system for helicopter can be adjusted by using a method and apparatus which positions the blade tip at a spatial location and angular orientation approximating a no-lift, full centrifugal load condition. An optical means is used to form a line-of-sight from the blade tip to a first and second target. The first target is mounted on the lead-lag hinge pin and the second target is mounted on or near the rotor drive hub. Both the optical means and either one or both of the targets may be offset so that, when the optical means, first target and second target will lie along a linear line-of-sight, the designed lead-lag angle of the corresponding blade to which the apparatus is coupled, will be achieved. The apparatus comprises a frame member through or on which the blade tip slips and includes levels to ensure the proper spatial and angular orientation of the blade given the specific rotor blade system. The first and second targets may take various forms according to the rotor blade system and the nature of the optical sighting means. In general the first target has a portion which is adapted to be visually lined-up with a portion of the second target. A specified alignment of the first and second of targets is uniquely defined, readily observable, and easily distinguishable from a non aligned relation. When aligned the blade is in the designed lead-lag angle.
REFERENCES:
patent: 1709310 (1929-04-01), Dahl
patent: 2737722 (1956-03-01), Keim
patent: 4319406 (1982-03-01), Pehrson
Schneider, E. J., "Alignment Works Better with Telescope in First Bearing", American Machinist, 5-1956, p. 152.
Hughes Helicopters Inc.
Punter William H.
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