Variable-pitch multi-blade propeller incorporating individually dismountable blades made of composite materials, process for manufacturing such blades and blades thus produced

Patent 4626173 Issued on December 2, 1986. Estimated Expiration Date:

March 8, 2004. 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.

Abstract Claims Description Full Text

Patent References

3303889

3594097

3754840

3765267

3824037

3869221

3923422

Plastics rotor blade
Patent #: 3950115
Issued on: 04/13/1976
Inventor: Euler

Multi-blade propellers
Patent #: 4281966
Issued on: 08/04/1981
Inventor: Duret , et al.

Air craft propeller assembly with composite blades
Patent #: 4302155
Issued on: 11/24/1981
Inventor: Grimes , et al.

More ...

Inventors

Assignee

Societe Nationale Industrielle Aerospatiale

Application

No. 06/587649 filed on 03/08/1984

US Classes:

416/134A, Aircraft rotors416/168R, Link connection to working member416/226, Formed with main spar416/230Wire, fiber, strand or fabric

Examiners

Primary: Garrett, Robert E.
Assistant: Pitko, Joseph M.

Attorney, Agent or Firm

Browdy and neimark

International Classes

B29D 31/00 (20060101)
B64C 11/26 (20060101)
B64C 11/00 (20060101)
B64C 27/00 (20060101)
B64C 27/32 (20060101)
B64C 27/473 (20060101)
B64C 27/82 (20060101)
F01D 5/28 (20060101)

Foreign Application Priority Data

1983-03-18 FR

Abstract

Each blade is fixed to the hub by the root part of the spar, arranged in the form of a loop surrounding a connection element bolted on the hub, with the interposition of rigid rings by a pin simultaneously fixing the hub on a drive sleeve transmitting thereto the driving torque of the central shaft. The hub comprises two coaxial cylindrical walls in each of which is pierced, for each blade, a circular opening in which the member for controlling the angle of attach which is fast with the blade root is mounted to rotate via self-lubricating rings. The invention is particularly applicable to helicopters.