Calibration weight arrangement for an electronic balance
US7975526B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2010 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Sep 20, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G23/012
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A calibration weight arrangement (4, 104) for an electronic balance with a force-transmitting mechanism (1) has a calibration weight (3, 103) adapted to be coupled to the force-transmitting mechanism. The arrangement also has a transfer mechanism and a drive source to manipulate the calibration weight in a guided movement. The drive source includes an actuator (18) cooperating with the transfer mechanism and at least one piezoelectric element (19) which drives the movement of the actuator. The piezoelectric element interacts with a drive wheel (17, 117) that is centrally positioned relative to the calibration weight arrangement and drives a likewise centrally positioned shaft (16, 126). The interaction between the piezoelectric element and the drive wheel occurs during the advance movement in one direction through the repeated engagement and release of a frictional contact force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.