Patent ID: 8513545
Filing Date: 2013-08-20
Classification: G01G

Abstract:
1. A built-in weight lifting and lowering device that adds and removes a load of a built-in weight to and from a load measuring mechanism of a weighing apparatus to perform calibration of the weighing apparatus and a normal weighing operation, comprising, a built-in weight latched in a weight holder, the weight holder being configured to be lifted and lowered with respect to a fixed portion, an elastic body interposed between the weight holder and a lower fixed portion of the fixed portion, a driving container disposed between the weight holder and an upper fixed portion of the fixed portion, a volume of the driving container being variable according to an interior content therein, the weight holder being lowered by an increase in volume of the driving container, and the weight holder being lifted by a repulsive force of the elastic body due to a decrease in volume of the driving container, whereby the load of the built-in weight is directly added to and removed from the load measuring mechanism by a change in volume of the driving container and the repulsive force of the elastic body.