Rotor without flapping hinges and without lead-lag hinges
Patent 4201515 Issued on May 6, 1980. Estimated Expiration Date: 
July 10, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 10, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3669566 3695779 3879153 3880551 3893788 Connecting element for a part of fiber-reinforced plastic Patent #: 4038885 InventorsAssigneeApplicationNo. 05/923339 filed on 07/10/1978US Classes:416/134A, Aircraft rotors403/291, FLEXIBLE MEMBER IS JOINT COMPONENT416/141Plural articulationExaminersPrimary: Vrablik, John J.Attorney, Agent or FirmInternational ClassesB64C 27/32 (20060101)B64C 27/33 (20060101) Foreign Application Priority Data1977-07-22 DEAbstractA rotor, especially for rotary wing aircraft, is constructed without flapping hinges and without lead-lag hinges. The rotor comprises a rigid rotor head and rotor blades secured to the rotor head by flexible coupling rods, for example, made of fiber reinforced composite material. One end of each rod is secured to the rotor head. The other end of each rod is secured to the root of the respective rotor blade. The rods are so arranged that their central longitudinal axes coincide with a generatrix of two coaxial cones having a central axis. One of the cones is located with its base in the respective rotor blade while the other cone is located with its base in the rotor head. This type of structure is surprisingly simple, yet capable of transferring substantial forces between the rotor head on the one hand and the rotor blades on the other hand.Field of SearchAircraft rotors | |
