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. 19, 1997
Filed:
Dec. 16, 1994
Applicant:
Inventor:
Philip J Koopman, Jr, Hebron, CT (US);
Assignee:
Otis Elevator Company, Farmington, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B / ; B66B / ;
U.S. Cl.
CPC ...
187291 ; 187394 ;
Abstract
An emitter and a plurality of sensors and are used to detect the relative positions between an elevator platform and landing sill. The emitters radiate energy through a reflection duct formed between the elevator platform and the landing sill. The plurality of sensors monitor the reflection duct so that radiated energy is detected. The sensors provide level signals in response to the radiated energy. A means responsive to the level signals determines when the platform is level with respect to the landing sill.