Self-stabilizing suspension and hoisting system

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

Reexamination Certificate

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Details

C254S285000, C254S397000

Reexamination Certificate

active

07407150

ABSTRACT:
A load hoisting system for raising and lowering a load. A first line supports a rigid beam with unequal mechanical advantages on either side of the load. A second line supports the same rigid beam with mechanical advantages on either side of the load that are, in total, equal to those on the first line but with a ratio of mechanical advantages unequal to the ratio of mechanical advantages of the first line. One end of each line is fastened to a fixed support and the other ends of the two lines are drawn at the same rate by a power source, which system eliminates all axial rotation of the beam. The system may be applied to both ends of a long load by drawing of all lines in synchronism, advantageously being applied to lift both ends of a boat.

REFERENCES:
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patent: 4181291 (1980-01-01), Gulliksson
patent: 4401335 (1983-08-01), Godbersen
patent: 5074528 (1991-12-01), Long, Jr.
patent: 5090841 (1992-02-01), Penick, Jr. et al.
patent: 5257891 (1993-11-01), Baumann et al.
patent: 5427471 (1995-06-01), Godbersen
patent: 5603420 (1997-02-01), Swanson
patent: 6640736 (2003-11-01), McLaughlin et al.
patent: 6926260 (2005-08-01), De Groot et al.
patent: 7070171 (2006-07-01), Mangin

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