| 摘要 |
<p>A high precision weighing-machine using strain-gauges wherein a load Q generates bending moments M straining a pair of horizontal parallel beams 19. The ends 25 of each beam 19, 77, 125 are shaped so that points XQ, XR thereof where load and reactive forces FQ, FR are applied form edges 33, 35 lying in a single horizontal plane xy containing the neutral axis n of the beam 77, 125. Each beam 77, 125 is longitudinally elastic so that these edges 33, 35 keep their longitudinal position XQ, XR when the beams 77, 125 bend under load Q so that the loaded arched beam 77, 125 may variably extend without horizontally urging its ends 25. Each beam 77, 125 comprises two interlinked horizontal members 81, 133, each integral with a respective beam end-plate 79, 135, which move vertically together and longitudinally independently of each other. Each beam 77, 125 includes flexible portions 75, 137 where the strain-gauges 37 are symmetrically connected to obtain a weight reading of the load independent of its eccentricity.</p> |
