Traversing hoists – Having horizontally swinging boom or bridge – And vertically swinging
Patent
1998-03-31
1999-08-03
Brahan, Thomas J.
Traversing hoists
Having horizontally swinging boom or bridge
And vertically swinging
212231, 414563, B66C 2306
Patent
active
059313218
ABSTRACT:
A crane structure for hoisting, holding and/or towing heavy loads is provided. The crane structure includes a frame, for example a wrecker truck chassis, a boom support assembly, and a pair of booms each having a first member pivotally mounted to the boom support assembly so that the first boom and the second boom are pivotal in parallel vertical planes. Each of the first boom and the second boom also has a fluid operable second member slidably received by the first member. A control system is in operative communication with the first boom, the second boom and a winch assembly to independently activate each second member to extend from and retract to its corresponding first member, to pivotally position each boom with respect to the frame, and to activate the winch assembly to retract and extend cables about free ends of the respective second members.
REFERENCES:
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patent: 1237573 (1917-08-01), Stogsdill
patent: 1359379 (1920-11-01), Holmes
patent: 2537755 (1951-01-01), Harbaugh
patent: 2726066 (1955-12-01), Lear et al.
patent: 3468439 (1969-09-01), Olitsky et al.
patent: 3684104 (1972-08-01), Oda et al.
patent: 3685673 (1972-08-01), Schweis
patent: 4519741 (1985-05-01), Testore
patent: 4993911 (1991-02-01), Grant
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