Helicopter rotors
US4436483A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 8, 1982 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | Jan 8, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/50
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A helicopter rotor includes a powered blade fold mechanism adapted to move a rotor blade between a spread operational position and a folded position and at least one lock pin (17) to lock the blade in its spread position. The mechanism includes a rotary power source (21) and a mechanical linkage (23, 25) having an over-center position and adapted so that energization of the power source in one direction moves the linkage through the over-center position to withdraw the lock pin and fold the blade, and energization in the other direction moves the blade to the spread position and re-inserts the lock pin automatically as the linkage moves back through its over-center position. Lock means may be provided to lock the blade in pitch and, in one embodiment particularly adapted for use in an articulated rotor, the lock means includes pitch, flap and lag locks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.