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:
Mar. 19, 1985
Filed:
Oct. 06, 1983
Roy Simmons, Bristol, GB;
Rolls-Royce Limited, London, GB;
Abstract
A mechanism 25 for preventing a turbine rotor 14 exceeding a predetermined speed in the event that a shaft 24 connecting the turbine rotor 14 to a compressor rotor 12 of the engine breaks and releases its torsional and axial constraint on the turbine rotor. The mechanism 25 comprises a segmented nozzle guide vane assembly 26 downstream of a stage of the turbine rotor 14. Each of the segments 26 is pivotally mounted (hinge pins 40) on an outer casing 34 at a region adjacent a radially outer upstream end of each segment 26. The structure of the engine on which the radially innermost ends of the segments 26 are mounted includes a releasable means 46. When the structure 46 is struck by the turbine rotor 14 the innermost ends of the segments 26 are released and allowed to swing rearwards and outwards about the pivotal attachment of the segments 26 to the outer casing 34. The upstream outer ends of the segments 26 are retained in the path of rotation of the blades of the turbine rotor 14 so that they collide with the blades and decelerate the turbine rotor 14.