Method and apparatus for reducing elevator service calls
US4623040A · kind A · utility
1Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1985 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Mar 4, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/0087
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for reducing unnecessary elevator service calls by cycling open and shut a nonresponsive car's door, is disclosed. The doors are cycled in the presence of car demand and indications the car door is shut but the hoistway door is ajar. The doors are cycled only after these conditions persist for a selected period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.