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. 29, 2009
Filed:
Sep. 09, 2004
Hiroyuki Nakagawa, Tokyo, JP;
Koei Matsukawa, Tokyo, JP;
Yoshikatsu Hayashi, Tokyo, JP;
Eiji Ando, Tokyo, JP;
Atsushi Mitsui, Tokyo, JP;
Hiroyuki Nakagawa, Tokyo, JP;
Koei Matsukawa, Tokyo, JP;
Yoshikatsu Hayashi, Tokyo, JP;
Eiji Ando, Tokyo, JP;
Atsushi Mitsui, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
In an elevator apparatus, a main rope suspending a car and a balance weight is looped around a traction sheave and a driven sheave of a traction machine. A driving-side speed detecting portion for detecting rotational speed of the traction sheave and a driven-side speed detecting portion for detecting rotational speed of the driven sheave are electrically connected to an operation control device. The operation control device includes a determination portion determining presence or absence of an abnormality in an elevator by calculating speed difference between rotational speeds of the traction sheave and comparing the speed difference to a fixed reference value, set in advance, and a control portion for controlling the operation of the elevator based on information from the determination portion.