Collison prevention in hoistway with two elevator cars
US7819228B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2005 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Oct 7, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/286
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elevator system (8) includes a hoistway (9) having a plurality of cars (10, 11) traveling therein, the hoistway includes a steel tape (14), each car having two tape readers (20, 21; 22, 23) which feed corresponding position detectors (29, 30: 31, 32) to provide independent position signals (35, 26: 37, 38). A group controller (52) assigns calls in a fashion to avoid collisions. Controllers (45, 46) for each car communicate with each other and when deemed necessary, either lower the speed, acceleration, deceleration of one or both of the cars, or stop (with or without reversing) one or both of the cars. Independent processors (41, 42) will drop the brake (49, 50) of either or both cars if they come within a first distance of each other, or will engage the safeties (18, 19) of either or both cars if they come within a lesser distance of each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.