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:
Feb. 05, 2013
Filed:
Apr. 15, 2008
Takaharu Ueda, Tokyo, JP;
Takaharu Ueda, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
In an elevator device, a car is raised and lowered by a plurality of hoisting machines respectively including hoisting machine brakes. Each of the hoisting machine brakes has a braking force large enough to stop the car by itself. Each of a plurality of brake control sections respectively for controlling the corresponding hoisting machine brakes includes a plurality of calculation sections. The calculation sections can detect a failure of the calculation sections by comparing own results of calculations and cause a corresponding one of the hoisting machine brakes to perform a braking operation upon detection of the failure of the calculation sections.