Propeller assembly
US3999887A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Jul 9, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/35
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A propeller assembly comprises a rotatable drive shaft and two separate blade subassemblies resiliently coupled to and driven by the shaft. Each blade subassembly has a pair of interconnected propeller blades extending in opposite directions radially of the shaft. The blade subassemblies are disposed in parallel planes with the blades of one subassembly oriented transversely of the blades of the other subassembly. Rotational movement of the shaft is transmitted to the blade subassemblies through viscoelastic material which is torsionally loaded and stressed in shear. The viscoelastic material resiliently permits and damps in plane or lead-lag movement of each blade subassembly relative to the drive shaft. The subassemblies are also interconnected so that the viscoelastic material resiliently permits and damps relative in-plane movement between the subassemblies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.