Month in the Patent Office

Abstract

A piston‐and‐cylinder friction type vibration damper 16 is disposed between each pair of adjacent rotor blades 10 of a helicopter rotor. There is no damper provided at the drag hinge 14 between each blade 10 and the hub structure 13 of the rotor. The damper 16 comprises a scrubbing action with vibration damping and it provides constant damping for normal blade‐to‐blade oscillations and an increased degree of damping when abnormal oscillations take place. As shown in fig. 1, the damper provides resistance to compression movements only. Another damper is described which is double‐acting.

Citation

(1958), "Month in the Patent Office", Aircraft Engineering and Aerospace Technology, Vol. 30 No. 10, pp. 321-321. https://doi.org/10.1108/eb033032