Vacuum lifting apparatus

Details Vacuum lifting apparatus Vacuum lifting apparatus

1989-12-08

1991-08-13

Spar, Robert J.

Material or article handling

Horizontally swinging load support

Swinging about pivot

1984684, 294 641, 901 40, 414752, B25J 102

Patent

active

050392743

ABSTRACT:
Vacuum lifting apparatus 1 containing a lift tube 2 which is extendable and retractable in length, and is located in an upright disposition with an upper end 3 connectable to a fixed or movable anchorage point or support 4, the lift tube interior 6 being connectable to a vacuum generating structure and each end 3, 7 of the tube 2 provided with air sealing structure, valve means 10 to connect the interior of the lift tube 2 at a controllable level to atmosphere to regulate the vacuum therein and hence the axial extension of the lift tube 2, and a relatively rigid device 11 located within the lift tube 2, which device 11 is axially displaceable or extendable and retractable with the lift tube 2 and carries at a lower end a means 14 for engaging a load to be lifted, transported and lowered.

REFERENCES:
patent: 2716497 (1955-08-01), Wahl et al.
patent: 3558171 (1971-01-01), Netsch et al.
patent: 3704038 (1972-11-01), Glanemann
patent: 3743340 (1973-07-01), Williamann
patent: 4413853 (1983-11-01), Andersson
patent: 4620831 (1986-11-01), Poncet et al.
patent: 4648786 (1987-03-01), Sakurai

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