Weighing apparatus with calibration weight means
US4977969A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Oct 11, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G23/012
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic weighing apparatus is provided, including a self-contained calibration weight module that is operated by a motor to alternately connect and disconnect, respectively, a calibration weight relative to the vertically-displaceable parallelogram-guided load receiving member of the scale. The calibration weight is normally suspended in an inoperable condition by means of a pair of internally threaded sleeves rotatably supported in the cover portion of the housing of the calibration weight module. A motor is operable to rotate the sleeves and thereby lower lifting screws threadably connected therewith, whereby the calibration weight is lowered toward a supported position between and in engagement with a pair of parallel carrier arms that extend horizontally from the load receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.