Lifting device

Claim 2

A lifting device for lifting objects having even and uneven weight distributions comprising: a pair of support columns having lifting columns vertically moveable relative thereto, said lifting columns having load contact platforms at the lower ends thereof for lifting a load therebetween, said lifting columns having an overhead horizontal spacer connecting the upper ends thereof and vertically moveable therewith, said lifting columns, said contact platforms and said horizontal spacer comprising a lifting carriage that raises and lowers as a unit, said lifting columns having a single source fluid pressure lifting mechanism supplying substantially equal lifting power to each lifting column through interconnecting fluid pressure conducting transmission lines, equalizing cables connected at their ends to said support columns, pulleys mounted on said lifting columns, said cables passing over said pulleys, said cables applying an additional lifting force to the lifting column being subjected to an additional load of said object having an uneven weight distribution, said pulleys comprising a pair of upper pulleys at each end of said spacer and a lower pulley near the lower end of each support column, said cables passing over said upper pulleys and under said lower pulleys.

Claim 3

A lifting device as in claim 1, wherein all said interconnecting fluid pressure lines and cables between columns on opposing sides of said object to be lifted are routed over said horizontal spacer and are moveable therewith.

Claim 4

A lifting device for lifting objects having even and uneven weight distributions comprising: a pair of support columns having lifting columns vertically moveable relative thereto, said lifting columns having load contact platforms at the lower ends thereof for lifting a load therebetween, said lifting columns having an overhead horizontal spacer connecting the upper ends thereof and vertically moveable therewith, said lifting columns, said contact platforms and said horizontal spacer comprising a lifting carriage that raises and lowers as a unit, said lifting columns having a single source fluid pressure lifting mechanism supplying substantially equal lifting power to each lifting column through interconnecting fluid pressure conducting transmission lines, each of said lifting columns having a pair of side plates attached thereto, a pair of shaft supports attached to said side plates and resting on the top edges of said lifting columns, said spacer having a pair of connecting lugs with shaft receiving apertures therein, a pulley shaft on said shaft supports extending through said apertures in said connecting lugs, a pair of pulleys rotatably mounted on said pulley shaft, retainer means attached to said side plates over said pulley shaft to prevent accidental removal thereof, said pulleys having cables passing thereover for applying additional loads to said lifting columns.

Claim 5

A lifting device for lifting objects having even and uneven weight distributions comprising: a pair of support columns having lifting columns vertically moveable relative thereto, said lifting columns having load contact platforms at the lower ends thereof for lifting a load therebetween, said lifting columns having an overhead horizontal spacer connecting the upper ends thereof and vertically moveable therewith, said lifting columns, said contact platforms and said horizontal spacer comprising a lifting carriage that raises and lowers as a unit, said lifting columns having a single source fluid pressure lifting mechanism supplying substantially equal lifting power to each lifting column through interconnecting fluid pressure conducting transmission lines, each of said lifting columns having a pair of side plates attached thereto, a pair of shaft supports attached to said side plates and resting on the top edges of said lifting columns, said spacer having a pair of connecting lugs with shaft receiving apertures therein, a pulley shaft on said shaft supports extending through said apertures in said connecting lugs, a pair of pulleys rotatably mounted on said pulley shaft, retainer means attached to said side plates over said pulley shaft to prevent accidental removal thereof, said pulleys having cables passing thereover for applying additional loads to said lifting columns.

Claim 6

A lifting device for lifting objects having even and uneven weight distributions comprising: a pair of support columns having lifting columns vertically moveable relative thereto, said lifting columns having load contact platforms at the lower ends thereof for lifting a load therebetween, said lifting columns having an overhead horizontal spacer connecting the upper ends thereof and vertically moveable therewith, said lifting columns, said contact platforms and said horizontal spacer comprising a lifting carriage that raises and lowers as a unit, said lifting columns having a single source fluid pressure lifting mechanism supplying substantially equal lifting power to each lifting column through interconnecting fluid pressure conducting transmission lines, equalizing cables connected at their ends to said support columns, pulleys mounted on said lifting columns, said cables passing over said pulleys, said cables applying an additional lifting force to the lifting column being subjected to an additional load of said object having an uneven weight distribution, a pair of side plates attached to each lifting column, a pair of shaft supports affixed thereto and resting on the top edges of said lifting columns, said spacer having a pair of connecting lugs with shaft receiving apertures therein, and a shaft on said shaft supports extending through said apertures in said connecting lugs.

Claim 7

A lifting device for lifting objects having even and uneven weight distributions comprising: a pair of support columns having lifting columns vertically moveable relative thereto, said lifting columns having load contact platforms at the lower ends thereof for lifting a load therebetween, said lifting columns having an overhead horizontal spacer connecting the upper ends thereof and vertically moveable therewith, said lifting columns, said contact platforms and said horizontal spacer comprising a lifting carriage that raises and lowers as a unit, said lifting columns having a single source fluid pressure lifting mechanism supplying substantially equal lifting power to each lifting column through interconnecting fluid pressure conducting transmission lines, equalizing cables connected at their ends to said support columns, pulleys mounted on said lifting columns, said cables passing over said pulleys, said cables applying an additional lifting force to the lifting column being subjected to an additional load of said object having an uneven weight distribution, a pair of side plates attached to each lifting column, a pair of shaft supports affixed thereto and resting on the top edges of said lifting columns, said spacer having a pair of connecting lugs with shaft receiving apertures therein, and a shaft on said shaft supports extending through said apertures in said connecting lugs.