Traversing hoists – Having counterweight or counterbalancing means – Counterweight movable relative to load support
Patent
1984-07-30
1987-03-31
Blix, Trygve M.
Traversing hoists
Having counterweight or counterbalancing means
Counterweight movable relative to load support
212256, 212261, B66C 2352
Patent
active
046536566
ABSTRACT:
A load lifting crane for raising the load at a site and moving the load in a substantially horizontal direction to a remote site where the load is lowered. The crane includes a base support member which has a pivotally supported vertically extending mast carried thereon. A substantially horizontally extending boom is carried by the upper end of the mast for pendulous movement. An actuator strut is connected between the upper end of the mast and the base support member so that by selectively varying the length of the actuator strut, the mast is pivoted for shifting the boom. As the boom is shifted, it is shifted in a substantially pendulous movement relative to the mast thereby moving the load-carrying end of the boom substantially horizontally after lifting the load off of a site. There is a rear suspender extending from the base support member to the rear end of the boom and it includes a rear suspender rotational link that engages a stop pin carried on the base of the support member for changing the radius of rotation of the rear suspender as the mast is rotated rearwardly for aiding in maintaining the load at the same height as it is shifted rearwardly.
REFERENCES:
patent: 951433 (1910-03-01), Carey
patent: 1023507 (1912-04-01), Davison
patent: 1359379 (1920-11-01), Holmes
patent: 3557968 (1971-01-01), Thaeter
patent: 3685668 (1972-08-01), Suverkrop
patent: 3754666 (1973-08-01), Suverkrop
Avila Stephen P.
Blix Trygve M.
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