| 摘要 |
A syphon for lifting solid articles includes a piston which is guided within a cylinder on a centrally arranged upstanding guide member and it is connected to a rod portion having means for connecting the device to a hoisting unit. A rolling diaphragm is connected from the upper end of the piston to an intermediate annular wall portion of the cylinder so that upward movement of the piston creates a vacuum in the space therebelow which is communicated through a conduit to a sealing area defined below a suction plate. The plate may be guided into association with an article to be lifted by a handle and the interior of the cylinder may be vented by a hand operated valve control which will open the lower portion of the cylinder to the atmosphere only when the piston has been lowered so as to permit actuation of the valve control.
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