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. 19, 2002
Filed:
May. 09, 2000
Harry Z. Huang, Plainville, CT (US);
Juan A. Lence Barreiro, Santiago de Compostela, ES;
Chouhwan Moon, Glastonbury, CT (US);
Ronald R. Pepin, Windsor Locks, CT (US);
Gary L. Freeland, Plainville, CT (US);
Robert H. Mashiak, Somers, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
The mean number of elevator door reversals, &mgr;, in groups of related door reversals, and the standard deviation, &sgr;, from the mean, are used to determine the likelihood that door reversals are caused by passenger interference; the likelihood is low if a recent number of reversals exceeds &mgr;+3&sgr;, , is medium if two out of three recent reversals exceed &mgr;+2&sgr;, and otherwise is high. The floors at which related notable elevator features occur are compared to determine a floor factor, F, depending on whether the notable feature occurs only at one floor or at more than one floor. Estimated probabilities, P′(S/C), that any component, C, will result in a symptom, S, (where S=first and second notable features in a related group and the accompanying floor factor, F) are provided by experts; the probability of P′(C) of any failure being of any given component is determined from failure history; and an estimated probability, P′(C/S), that symptom S is caused by component C is given by: