Helicopter rotors
US4509898A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1983 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | Jun 20, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/16
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A helicopter rotor includes attachment means for attaching a rotor hub to a tubular rotor drive shaft in a manner establishing a primary thrust load path and further attachment means adapted to provide a normally passive secondary thrust load path and operative automatically to retain the rotor hub in the event of a failure in the primary thrust load path. In the described embodiments the further attachment means comprise a multi-part collet consisting of a plurality of identical collet parts located internally of the drive shaft. Each collet part has an external frusto-conical surface one end for location adjacent a mating surface formed internally of the drive shaft, and a radially extending flange portion at its other end for attachment to an end surface of the drive shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.