초록 ▼

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 l

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.

대표청구항 ▼

A vacuum lifting device suspendable from and movable by a crane or the like and releasably attachable to a smooth surface of an object to be moved comprising: a support assembly having an upper end and a lower end; attachment means at said upper end of said support assembly; a vacuum pad connected t

A vacuum lifting device suspendable from and movable by a crane or the like and releasably attachable to a smooth surface of an object to be moved comprising: a support assembly having an upper end and a lower end; attachment means at said upper end of said support assembly; a vacuum pad connected to said lower end of said support assembly and having a cavity on its underside cooperable with a smooth surface of an object to define a vacuum chamber; a vacuum pump assembly mounted in said device and selectively operable to control air pressure conditions in said vacuum chamber whereby said object adheres to or is released from said vacuum pad, a cover member mounted on said support assembly above said vacuum pump assembly to define a protective housing for said vacuum pump assembly; said support assembly comprising upper means connectable to said crane and having a threaded shank, a threaded rod, a threaded sleeve connecting said shank and said rod together in end-to-end relationship, said rod having a lower end which is threadedly engaged with said vacuum pad; said threaded shank of said upper means extending through said cover member, whereby said cover member is secured by entrapment between said threaded sleeve and said upper means.