| 摘要 |
In an inflatable lifting device comprising an upper platform to support a load, a lower base platform and a flexible, fluidtight diaphragm interposed between the two platforms for inflation to lift the load, the improvement comprising a diaphragm of truncated conical configuration. In some practices of the invention, two such diaphragms are effectively stacked on top of each other to increase the jacking height of the device. Constructuion of the conical diaphragm provides approximately uniform strength of the diaphragm around its entire periphery. Safety means are provided to prevent over-pressurization of the diaphragm at its maximum lifting height. Means are also provided to prevent collapse of the loaded device in the event the fluid supply line should inadvertantly be disconnected.
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