Elevator relevelling control apparatus
US4337846A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1980 |
| Grant date | Jul 6, 1982 |
| Priority date | — |
| Expiry date | Apr 22, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/44
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elevator relevelling control apparatus for controlling the movement of an elevator car (11) such that when the car is misaligned with the landing position of a selected landing floor, the car is restarted and brought into alignment. A traction motor (M) is controlled by a landing means (1) which generates a speed command signal (1a) of a magnitude which increases linearly with the extent of misalignment. First and second position detecting devices (15, 16, 17, 18) are provided in the hoistway to detect misalignment from the landing position by a first or second predetermined distance, respectively. The car is provided with load detecting means (12) for detecting whether or not the car is overloaded. If the load detecting means (12) detects that the car is not overloaded, and a switching device (15, 16) detects that the car is misaligned by a first predetermined distance, a speed command signal (1a) of suitable magnitude is supplied to the traction motor (M), thereby effecting relevelling. If, on the other hand, the car is detected to be in an overloaded state, and a switching device (17, 18) detects that the car is misaligned by a second, greater, predetermined distance, a speed…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.