| 摘要 |
A vacuum lifting device is attachable to a crane and operates to lift and subsequently release a sheet of material. The device comprises a support assembly including an eyebolt at its upper end for attachment to the hook, a threaded rod and a coupling nut securing the eyebolt and rod together. The lower end of the rod is connected to a vacuum pad. A cover member is fixedly secured to the eyebolt by entrapment between the coupling nut and the eyebolt to provide a protective housing. A vacuum pump is mounted within the housing. In operation, with the device resting on the sheet and with the vacuum release valve closed, actuation of the motor switch starts the motor and vacuum pump so as to create a vacuum in the vacuum chamber whereby the sheet adheres to the vacuum pad.
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