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US 4,411,073 AGranted
Pitch testing apparatus
OwnerTerence J. Ryaninventor
Life of this patent
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Abstract
An instrument for measuring the pitch of propeller blades which includes a probe which can contact and remain in contact with a propeller blade while there is continuous relative rotation of the probe and the blade, there being means to measure the degree of angular rotation and the distance of movement of the probe and means whereby the two parameters can be manipulated to provide a measurement of pitch. The applications shows several forms of instrument to effect this result under different circumstances.
Claims12
An instrument for measuring the pitch of a propeller blade comprising:
- (a) a probe shaft mounted for axial movement;
- (b) means for maintaining the probe shaft in constant contact with the propeller blade at a fixed radial distance from the center of the blade;
- (c) means for providing continuous relative rotation between the probe shaft and the blade;
- (d) means for determining the amount of relative angular rotation between the blade and probe shaft;
- (e) means for determining the amount of axial movement of the probe shaft during the relative angular rotation;
- and
- (f) means for providing a direct reading of the pitch of the propeller blade at the radial distance at which the probe shaft is located and over the part of the blade traversed by the probe shaft based on the amount of relative angular rotation and the axial movement of the probe shaft.
4 more elements
Dependencies are inferred from the claim text.