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:
Apr. 01, 2008
Filed:
Oct. 15, 2002
James L. Hubbard, Kensington, CT (US);
Armando Servia-reymundo, Madrid, ES;
Michael Mann, Berlin, DE;
James L. Hubbard, Kensington, CT (US);
Armando Servia-Reymundo, Madrid, ES;
Michael Mann, Berlin, DE;
Otis Elevator Company, Farmington, CT (US);
Abstract
Elevator brake or other drag is checked by establishing (-) baseline motor currents at plural determined positions as the car is moved up and down both empty and with full load. In a normal run (), the load is recorded () and the motor current required to drive the load at rated speed at the next determined position is both predicted () and measured. If the difference between the predicted and actual current exceeds a tolerance (), the car stops at the next floor (), the system is shut down () and a message generated (). When the brake is in proper operating condition, baseline motor current required to move a car with the brake engaged is recorded. Thereafter, a high fraction (such as 90%) of baseline motor current is applied to attempt to move the car. If the car moves, the system is shut down () and a message generated ().