Emergency stop apparatus for electric elevators
US4284175A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1979 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Jun 27, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/24
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An emergency stop apparatus for electric elevators which comprises a DC motor for driving a cage and being controllingly driven by variable DC power source connected to an AC power source, a power stoppage memorizing circuit which detects the power stoppage of the AC power source and memorizes the power stoppage, a motor stopping circuit for stopping the motor when the power stoppage memorizing circuit operates, and a memory erasing circuit for erasing the memory for the memorizing circuit after the cage stops. In the apparatus, a start command issued through the operation from a floor or the cage inside releases the motor stopping circuit to permit the cage to restart its travel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.