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, 1993
Filed:
Sep. 08, 1992
Applicant:
Inventors:
Gerald E Johnson, Farmington, CT (US);
Vlad Zaharia, Rocky Hill, CT (US);
Assignee:
Otis Elevator Company, Farmington, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ; B65G / ;
U.S. Cl.
CPC ...
340541 ; 198323 ; 340555 ;
Abstract
An optical fiber (28) disposed at the entry edge (32) of an escalator handrail guard (22) receives light from an LED (38), the magnitude of which is sensed by a detector (40), the output of which is compared (48) to determine whether its magnitude is sufficient to indicate the lack of intrusion of objects into the guard (22); if not a relay (56, 58) will drop power to the motor (62).