Active control of elevator platform
US5322144A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1993 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Jun 11, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B11/0286
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for actively counteracting a disturbing force acting horizontally on a platform moving vertically in a hoistway is disclosed. A manifestation of the disturbing force such as acceleration is sensed and counteracted, for example, by effectively adding mass to the platform in proportion to the sensed acceleration. This may be accomplished by using an electromagnet actuator for actuating the platform in response to a control signal from a control means which is in turn responsive to the sensed signal. Whatever type of actuator is used, it may be used as well to bring the platform to rest with respect to a hoistway sill prior to transferring passengers. The control means may be analog or digital or a combination of both. A preferred analog-digital approach is disclosed in which the digital part is responsive to accelerometer signals, the analog part is responsive to a force command signal from the digital part and provides a position feedback signal in return. In a preferred embodiment, four electromagnet actuators are situated near the bottom of the platform. Each actuator may act along a line which intersects the walls of the car at a forty-five degree angle. A …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.