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:
Jul. 20, 2004
Filed:
Oct. 10, 2002
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B 1/34 ;
U.S. Cl.
CPC ...
B66B 1/34 ;
Abstract
A vibration reduction apparatus for an elevator includes acceleration sensors for detecting vibrations of a elevator car, controllers for calculating forces to be applied to the elevator car, based an signals output by the acceleration sensors, and actuators for applying forces to the elevator car in accordance with the forces calculated by the controller. A dead band filter, which has a dead band region corresponding to noise level of the acceleration sensors, and an integrator, which integrates the signals output by the acceleration sensors after filtering by the dead band filter, are located in the acceleration sensors, or in the controllers, or between them.