Emergency control system for elevators
US4690251A · kind A · utility
5Cited by
2References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 10, 1986 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Apr 10, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An emergency control system for an elevator has a circuit for producing a signal in response to a relatively small vibration of a structure in which the elevator is installed; a first circuit responsive to the signal for controlling the operation of the elevator under a predetermined mode for a first predetermined time interval; and a second circuit for disabling the signal producing circuit simultaneously with the start of operation of the first circuit and enabling the signal producing circuit for a second predetermined time interval longer than the first predetermined time interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.