Self adjustable escalator handrail drive with balanced drive chain tension
US5133443A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Mar 15, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B23/04
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The handrail drive utilizes one or more pairs of drive chain sprockets and idler sprockets which form a nip over which the drive chain moves. The drive chain and idler sprockets are mounted on rotating drive shafts which in turn are eccentrically mounted in rotatable bushings. The drive rollers will automatically tighten on the handrail as friction increases between the rollers and handrail due to increased resistance to movement of the handrail. The rotatable bushings on each drive sprocket and its associated idler sprocket are connected together to ensure that chain tension equalizes between each drive and idler sprocket so that no drive chain slack will occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.