Traversing hoists – Having vertically swinging boom – Having means to swing boom vertically
Patent
1984-12-24
1986-04-29
Blix, Trygve M.
Traversing hoists
Having vertically swinging boom
Having means to swing boom vertically
212267, 212264, 52121, B66C 2304
Patent
active
045851328
ABSTRACT:
A multi-section telescopic boom is disclosed having a base section supported for pivotal movement, a manual section telescopically received in said base section, a mid section, and a tip section which sections are progressively lighter from the base section to the tip section when excluding the weight of head machinery connected to the tip section. The heavy manual section is stored in the base section when a load to be transferred between two locations can be reached with the mid and tip sections extended thereby substantially decreasing the turning moment about the pivot axis due to the weight of the boom sections resulting in an increased load carrying capacity of the boom. The boom is preferably supported by a pendant line operatively connected to the outer end of the tip and base sections and trained within the boom to aid a single hydraulic ram to extend and retract selected sections of the boom.
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Rathe Robert A.
Volkman Thomas M.
Avila Stephen P.
Blix Trygve M.
FMC Corporation
Kamp R. C.
Megley R. B.
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