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:
Aug. 10, 1993
Filed:
Mar. 16, 1992
Applicant:
Inventors:
Kunihiro Ogihara, Hitachi, JP;
Hideaki Kaneda, Katsuta, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01M / ; F01D / ;
U.S. Cl.
CPC ...
415 16 ; 415 30 ; 36443102 ; 364507 ; 364508 ; 364565 ;
Abstract
An apparatus comprises a first rotational speed detecting device provided on a stub shaft at a position closer to a turbine than a pump, a second revolution speed detecting device provided at the other end of the stub shaft, a comparator for continuously comparing values detected by these first and second rotational speed detecting devices, and a device for tripping the turbine when a difference is determined between the values compared by the comparator.