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. 30, 2011
Filed:
Jan. 30, 2006
Applicants:
Edward D. Piedra, Holyoke, MA (US);
Jeffrey M. Izard, Bolton, CT (US);
Ismail Agirman, Southington, CT (US);
Inventors:
Edward D. Piedra, Holyoke, MA (US);
Jeffrey M. Izard, Bolton, CT (US);
Ismail Agirman, Southington, CT (US);
Assignee:
Otis Elevator Company, Farmington, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B 1/34 (2006.01);
U.S. Cl.
CPC ...
Abstract
An encoder failure in an elevator drive system is detected and managed. A velocity of the elevator drive system is provided by an encoder signal () and compared with a minimum velocity threshold (). An encoder fault timer is incremented when the velocity is less than the minimum velocity threshold (). The elevator drive system is disabled when the encoder fault timer reaches a fault threshold time ().