Elevator system
US4258829A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1979 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Jul 27, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/285
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elevator system having an elevator car operable in the up and down travel directions in a selected one of first and second speed modes. The elevator system develops a bi-directional speed pattern signal from a selected one of first and second unidirectional speed pattern input signals, with the polarity of the bi-directional speed pattern signal being responsive to the selected travel direction. su PAC BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates in general to elevator systems, and more specifically to speed pattern processing apparatus for elevator systems. 2. Description of the Prior Art Elevator systems of the traction type conventionally control the travel and speed of an elevator car via an error signal responsive to the difference between the desired speed and the actual speed. The desired speed is provided by a speed pattern generator which generates a speed pattern signal for comparison with a signal responsive to actual speed, such as a signal from a tachogenerator linked to the elevator drive machine. The speed pattern signal is a bi-directional signal, with one polarity requesting travel in one travel direction, and the other polarity re…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.