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:
Sep. 14, 1999
Filed:
Aug. 15, 1997
Applicant:
Inventor:
Sanjay Kamani, Unionville, CT (US);
Assignee:
Otis Elevator Company, Farmington, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
187335 ; 187280 ;
Abstract
A safety chain of an elevator system utilizes optical fiber to verify mechanical locking of elevator doors. The elevator doors have locks which incorporate the optical fiber to determine if each of the doors has been locked. The optical safety chain provides the necessary feedback to the elevator controller for safe operation of the elevator system.