Patent · US Expired

Four-blade rotor, especially for helicopters

US4299539A · kind A · utility

4Cited by

3References

10Claims

0Family size

Assignee

Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftung · DE

Inventors

Alois Schwarz · Putzbrunn, DE
Karlheinz Mautz · Ottobrunn, DE
Michael Stephan · Berlin, DE

Key dates

Filing date	Nov 20, 1978
Grant date	Nov 10, 1981
Priority date	—
Expiry date	Nov 20, 1998

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB64C27/45
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

The present four-blade rotor is made up of two blade pairs, each blade pair aving two rotor blades arranged diametrically opposite one another. The blades of each blade pair are coupled to each other by means of a coupling loop for taking up centrifugal forces produced by the rotation of the blades. The present rotor system also has a centering device including a centering body and tension straps for each coupling loop. The tension straps connect the respective loop end to the centering body whereby the two coupling loops may be centered in the rotor head practically without play and without substantially limiting the free movement of the coupling loops.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.