Device for limiting the flapping movements of a rotary-wing aircraft main rotor
US4289448A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1979 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | Aug 22, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/322
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
This invention concerns devices for limiting the flapping movements of the blades of a rotary-wing aircraft main rotor. The device described has a well known reciprocal ring lower abutment common to all the blades. The disadvantages of this well known arrangement is obviated by the use of separate upper abutment devices for each blade. Each upper abutment device comprises a bent lever a first arm of which forms an abutment part and a second arm supports a weight. The lever can oscillate on a pivot and is acted upon by a spring which holds it in a stop position when the rotor stops so that the first arm of the lever extends almost parallel to the axial plane of symmetry of the associated blade. When the rotor rotates at sufficient speed centrifugal force pivots the lever away from the blade root.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.