| 摘要 |
This patent consists of two superposed plates, of suitable dimensions and type so that one is able loosely to straddle the other and to constitute a kind of box, of variable height, the inside of the enclosure thus obtained containing electric cells which are sensitive to pressure, arranged, preferably, at corners of the actual platform and fixed on the one hand to the base of the lower plate and on the other hand, elastically, to the roof of the upper plate, from which plates the first one is unable to be moved, whilst the second is able to move over the former in accordance with the loads deposited on the aforesaid platform. <IMAGE>
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