The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 2021
Filed:
Feb. 25, 2019
Bell Helicopter Textron Inc., Fort Worth, TX (US);
David Heverly, Arlington, TX (US);
Frank Bradley Stamps, Colleyville, TX (US);
Gary Miller, North Richland Hills, TX (US);
Richard E. Rauber, Euless, TX (US);
Thomas C. Parham, Jr., Colleyville, TX (US);
Michael R. Smith, Colleyville, TX (US);
Michael Scott Seifert, Southlake, TX (US);
Jouyoung Jason Choi, Southlake, TX (US);
Textron Innovations Inc., Providence, RI (US);
Abstract
A vibration attenuator for a rotor is rotatable about a mast axis and has a frame configured for rotation about the mast axis relative to the rotor. A first mass is axially translatable in a first direction relative to the frame parallel to a first axis, and a first biasing force urges the first mass toward a first-mass rest position in which the first mass is symmetric about the mast axis. A second mass is axially translatable in a second direction relative to the frame parallel to a second axis, and a second biasing force urges the second mass toward a second-mass rest position in which the second mass is symmetric about the mast axis. A selected first or second mass moves radially outward from the rest position to oppose vibrations in the rotor.