Elevator car system with three guide rails
US4793441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1987 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Oct 20, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B7/02
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The elevator car is guided in its movement through the hoistway by the two conventional guide rails positioned one on each side of the car, and also by a third guide rail positioned on one side of the car adjacent one of the car doors. The blade of the third guide rail is parallel to the sides of the car, and is engaged by a pair of guide rolls which are mounted on a beam extending out from under the car floor. The third guide rail is mounted in the hoistway on the bracket beams which secure the counterweight guide rails in place. The purpose of the third guide rail is to prevent lateral oscillation of the car as it moves through the hoistway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.