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:
Dec. 19, 2000
Filed:
Feb. 01, 1999
Otis Elevator Company, Farmington, CT (US);
Abstract
An elevator system includes an electronic driver which transmits a multi-phased electric current through a relay to a motor driving an elevator car. Under normal operating conditions, the motor uses the current from the driver to move the elevator car in a hoistway. When electric power fails, the elevator car is moved by gravity for any necessary rescue or maintenance operations, and consequently moves the motor. The movement of the motor generates a multi-phased electric current therein. The generated current is utilized to power a display panel of a movement indicator, which is automatically connected to the motor by the relay when power fails in the elevator system. The powered display panel informs the operator of the direction and speed of travel of the elevator car.