Traversing hoists – Having vertically swinging boom – Having means to swing boom vertically
Patent
1981-03-05
1984-03-06
Blix, Trygve M.
Traversing hoists
Having vertically swinging boom
Having means to swing boom vertically
52118, B66C 2304
Patent
active
044349025
ABSTRACT:
A telescopic boom includes at least two sections and a manual section is sections being extended and retracted by a single hydraulic ram. A first coupling selectively connects or releases the ram's cylinder case from the second boom section while a second coupling connects or releases the other end of the cylinder case to the manual section. The first coupling includes a crank for coupling and uncoupling the cylinder case and second section. The second coupling includes a retrieval pin movable into position for connecting the cylinder case to the manual section when retracting the manual section within the second section, and releasable lock mechanisms are provided to lock the manual section in extended position. The method of operating the boom includes the step of pivoting the boom to a near vertical position prior to extending the manual section relative to the second section.
REFERENCES:
patent: 3171545 (1965-03-01), Knight et al.
patent: 3243052 (1966-03-01), Grove
patent: 3368696 (1968-02-01), Johnston et al.
patent: 3386594 (1968-06-01), Grove
patent: 3398645 (1968-08-01), Nansel
patent: 3462023 (1969-08-01), Grove
patent: 3648850 (1972-03-01), Rochon et al.
patent: 3770138 (1973-11-01), Chalupsky et al.
patent: 3795321 (1974-03-01), Johnston
patent: 3842985 (1974-10-01), Svede
patent: 3921819 (1975-11-01), Spain
patent: 3987594 (1976-10-01), Rao et al.
patent: 4057942 (1977-11-01), Kranefeld et al.
patent: 4100707 (1978-07-01), Kranefeld et al.
Cox, Jr. James W.
Evans John D.
Goode Frederick R.
Blix Trygve M.
Brahan Thomas J.
FMC Corporation
Megley R. B.
Moore A. J.
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