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:
Sep. 24, 2019
Filed:
Nov. 20, 2014
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Rikio Kondo, Chiyoda-ku, JP;
MITSUBISHI ELECTRIC CORPORATION, Chiyoda-ku, JP;
Abstract
In an elevator system, whether an emergency stopper thereof operates normally can be confirmed by letting a driving sheave run idle even in a case where the driving force of a hoisting machine is not large enough, the elevator system includes a main rope to suspend an elevator car and a counterweight, the emergency stopper to prevent the elevator car from dropping, the driving sheave, with the main rope wound around, to drive the main rope by a frictional force therebetween, the hoisting machine to rotate the driving sheave, and an elevator controller to drive the hoisting machine, wherein the elevator controller drives the hoisting machine, with the emergency stopper kept in operation, to let the driving sheave run idle by exciting vertical natural period vibration of the counterweight.