Load measuring apparatus for an elevator car
US5306879A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1992 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | Jan 30, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G19/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The load measuring apparatus is arranged at an elevator car and detects the car load brought about by passengers and/or goods transported by the elevator car. An upper crossbeam together with vertically extending supports and a lower crossbeam forms a support frame suspended at traction cables and moves within an elevator shaft along suitable guide rails. A floor frame mounted on isolation pads at the lower crossbeam carries the elevator car. At the roof of the elevator car there is centrally arranged a reference plate member which is part of the load measuring apparatus. A proximity sensor centrally arranged at the upper crossbeam has a predetermined frontal spacing from the reference plate member in the no-load condition of the elevator car. When the elevator car carries a load this predetermined frontal spacing increases as a function of compression of the isolation pads. The proximity sensor then generates an electrical signal or potential which is dependent upon the momentarily prevailing frontal spacing of the sensor from the reference plate member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.