Gravity crane

Details Gravity crane Gravity crane

1984-08-06

1985-07-16

Blix, Trygve M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

212195, 212196, 212255, 212263, B66B 1104, B66C 2372, B66C 2306, B66C 2382

Patent

active

045290644

ABSTRACT:
A gravity crane which is manually operated by an operator who is harnessed to one end of a cantilevered balance beam. Clockwise moments are furnished by a fixed counterweight and by a adjustable ballast for coarse balancing. Counterclockwise moment is provided by the weight of the operator. By displacing a control weight located close to the operator the net sum of clockwise and counterclockwise moments may be smoothly shifted so that the operator can raise or lower himself with a minimum of effort, thereby simulating weightlessness. The operating control cord is always within reach of the operator and the entire crane may be swiveled on a rotatable base.

REFERENCES:
patent: 7236 (1876-07-01), Bates
patent: 445824 (1891-03-01), Smith
patent: 2195299 (1940-03-01), Frankel
patent: 3098539 (1963-07-01), Gorman
patent: 3472342 (1969-10-01), Wuesthoff
patent: 4360307 (1982-11-01), Larsson
patent: 4449884 (1984-05-01), Motoda

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