Process for manufacturing a variable pitch multi-blade propeller by molding resin-impregnated fails around a preform
US4639284A · kind A · utility
30Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1985 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Jan 4, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1043
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A variable pitch multi-blade propeller suitable for use on a helicopter is constructed of a foam preform joined with a fibrous spar enclosed in resin-impregnated foils and fitted with a metal leading edge. Various components are assembled in a mold and the resins, then cured. The structure may further include a reinforcing yoke of carbon fiber fabrics preimpregnated with a polymerizable synthetic resin. The process may further include a heat treating step to effect polymerization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.