Elevator apparatus with sheave rotational speed difference determination for detecting an abnormality
US7637357B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2004 |
| Grant date | Dec 29, 2009 |
| Priority date | — |
| Expiry date | Oct 19, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.