Centering control for elevator horizontal suspension
US5367132A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1993 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | May 27, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B7/042
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An improved centering control for an elevator horizontal suspension having at least one actuator and includes a circuit for disabling the control or braking the actuator in response to an error signal indicative of the difference between a reference signal and a sensed signal indicative of the degree of centering of the car. Of course, both braking and disabling may be carried out instead of just one. For those cases in which two actuators are acting in concert to center the car, where the control is responsive to the error signal for only selecting one of the opposed actuators at a time, a small centering window is set up about the centered condition and part of the window is used to disable or brake one of the actuators and another part to disable or brake the other of the actuators. Again, both disabling and braking operations may be carried out at the same time with respect to a given actuator. For a centering control in which opposed actuators are used with individual feedback control loops to achieve a preselected preload, the improved control only uses the feedback loop when the corresponding actuator is unselected for actuation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.