Elevator with traction sheave
US4756388A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1987 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Mar 16, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B11/08
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elevator has a drive mechanism connected to a traction sheave provided with grooves, over which run parallel suspension cables, and an elevator cage and an associated counterweight suspended from the suspension cables. The elevator is also provided with at least two diverting pulleys over which the suspension cables run and of which at least one diverting pulley is associated with the traction sheave in such manner that the suspension cables extending from the elevator cage to the counterweight have first and second wraps around the traction sheave and, between these wraps, a further wrap around the diverting pulley. Prior art traction sheave elevators exhibit insufficient friction between the traction sheave and the suspension cable, for which reason it is necessary, in the case of elevators of great heights, to use so-called compensating cables, which add to the weight of the elevator. With the present invention, this disadvantage is avoided by giving each of the first and second wraps an angle of wrap of at least 180.degree..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.