| 摘要 |
<p>A weighing scale detects and indicates changes in a small weight that is embedded within a much larger residual weight (16). The scale device has a base (12) and a top weighing pan (14) above it, with a linkage (28, 30) supported between the base and the top pan. A counterbalance weight lever (40) is supported on a pivot member (42) and has one end connected to the linkage, and a counterbalance weight (46) on the other end. An adjustable tensioning spring (50) provides a balancing force for the counterbalance weight lever within the weight range of the critical weight. A potentiometer or other detecting device can provide an electrical signal to an alarm device to warn the consumer that the weight of a consumable quantity has dropped into the critical weight range.</p> |
