Traversing hoists – Having counterweight or counterbalancing means – Counterweight movable relative to load support
Patent
1983-09-01
1985-12-10
Blix, Trygve M.
Traversing hoists
Having counterweight or counterbalancing means
Counterweight movable relative to load support
212148, 212150, 212232, 254291, 414719, B66C 2376, B66C 1306
Patent
active
045573905
ABSTRACT:
An apparatus is disclosed for counterbalancing a load carried by a crane by a counterweight suspended from the mast of the crane. A counterweight height control system is provided for maintaining the counterweight a few inches above the ground during operation, which system may be manually overridden by operator actuated controls. A pair of spaced counterweight positioning winches on opposite sides of the longitudinal axis of the crane's upper works move the counterweight toward or away from the vertical axis of rotation of the upper works in response to operator actuated controls and also provides side forces on the counterweight for minimizing swinging of the counterweight.
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Blix Trygve M.
FMC Corporation
Johnson R. B.
Megley R. B.
Moore A. J.
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