Releasable hoistway door safety interlock
US4469200A · kind A · utility
4Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1981 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Oct 29, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/8946
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
To prevent passengers in an elevator from opening the hoistway door when the car is well above the floor, a rotatable arm is located below the car and engages the hall door to prevent it from being opened. This arm may be reached from the floor, by opening the hoistway doors slightly, and rotated to disengage it from the door, which may then be fully opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.