Device incorporating retractable stops for limiting the flappings of the blades of the main rotor of a rotorcraft
US4652210A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1984 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Sep 7, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/322
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The invention relates to a device incorporating retractable stops for limiting the flappings of the blades of the main rotor of a rotorcraft. Each lower stop comprises a convex roller presenting a convex stop surface and bearing a weight at the end of an arm. By its convex roller, the lower stop is mounted to pivot about the pin for retaining the blade on the hub. On the ground, the bearing member is in contact with a lower bearing surface fast with the blade at the level of the pitch control lever, in order to limit the downward flappings of the blade. The lower stop pivots about the pin above the lower plate. The upward flappings of the blade may be limited by upper stops disposed substantially symmetrically below the upper plate. A second lower weight, returned by a spring, and engaging by a nose-shaped element in a notch in the rear of the bearing surface, acts as upper stop. The invention is more particularly applicable to equipping helicopters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.