B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
294/2
B66C 1/02 (2006.01)
Patent
CA 2014866
VACUUM LIFTING DEVICE FOR HANDLING SHEET MATERIAL Abstract of the Disclosure A small, compact, self-contained vacuum lifting device is attachable to a crane and operates to lift and subsequently release a sheet of material. The device comprises a vertically extending 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 which is cooperable with the sheet to define a vacuum chamber. A base plate located above the vacuum pad is fixedly secured to the support assembly by entrapment between the vacuum pad and a jam nut of the rod. A cover member is fixedly secured to the eyebolt by entrapment between the coupling nut and the eyebolt and cooperates with the base plate to provide a protective housing. A vacuum pump driven by an electric motor having an on/off switch is mounted on the base plate within the housing and has a suction port which is connected to the vacuum chamber through an air filter, a one-way check valve and an air passage in the vacuum pad. A manually operable closed/open vacuum release valve is connected between the suction port and the one-way check valve and atmosphere. A vacuum gauge is connected to the suction port. Manually operable actuators for the motor switch and vacuum release valve and the vacuum gauge are mounted on the exterior of 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 (which is maintained by the one-way check valve) whereby the sheet adheres to the vacuum pad. The crane is then operated to raise, transport and lower the lifting device and sheet adhereing thereto. Manually opening the vacuum release valve to admit air into the vacuum chamber enables the lifting device to be detached from the sheet.
Dost James A.
Dost Incorporated
Smart & Biggar
LandOfFree
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