Patent ID: 7631536

Claim:
A calibration weight arrangement for a gravimetric measuring instrument having a force-measuring cell comprising a fixed part and a load-receiving part, the calibration weight arrangement comprising: at least one calibration weight, adapted to be coupled to the load-receiving part; a transfer mechanism for transferring the at least one calibration weight during a phase of movement from a rest position into a calibrating position and from the calibrating position to the rest position, the transfer mechanism comprising: at least one resetting element, selected from the group consisting of: an arm spring, a torsion-bar spring, a leaf spring, a compressive coil spring and a tensile coil spring; a lifting system; and a drive source that comprises a non-self-locking actuator that is energized only during the movement phase, and a bi-stable or tri-stable positioning element, with a first stable state thereof defining the calibrating position, a second stable state thereof defining the rest position, and with the third stable state, if present, located between the calibrating and rest positions.