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:
Mar. 07, 2000
Filed:
Apr. 27, 1998
Steven D Coste, Berlin, CT (US);
August J Dobler, West Simsbury, CT (US);
Otis Elevator, Farmington, CT (US);
Abstract
An emergency terminal speed limiting device (ETSLD) uses terminal zone position checkpoint detection with a binary coding method for the sensible stationary part mounted in the terminal zone. Instead of using three separate stationary vanes of different lengths as cams for actuating three separate switches on the car as they pass by the cams, only two vanes are needed. They can be of shorter length, e.g. equal length, and overlapped in a central part of the terminal zone to create three distinct subzones to thereby create a sensible binary coded subzone indicator. The boundaries of the subzones can be used as position checkpoints. Material and manpower for installation are thereby reduced. The stationary part need not be vanes but could take other forms such as reflective tape. Likewise, the moving sensor part can be other than a cam-operated switch, such as an optical transceiver.