Traversing hoists – With haul-in line
Patent
1984-08-31
1985-06-18
Blix, Trygve M.
Traversing hoists
With haul-in line
212163, 60444, B66C 1348
Patent
active
045236860
ABSTRACT:
An improved anti-two block system having a boom hoist drum driven by a first hydraulic motor with a first variable displacement motor controlled by a first ram moveable in a given direction to supply fluid pressure for driving the boom drum to lower a boom and a hook block drum driven by a second hydraulic motor with a second variable displacement pump controlled by second ram moveable in a given direction to supply fluid pressure for driving the hook drum to raise a hook block. A differential mechanism sums the movement of the hook block and boom and activates a switch to energize solenoid valve means, when the hook block is a predetermined distance from the boom, to preclude movement of said rams in the given directions.
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Moore Donald E.
Olsen David W.
Blix Trygve M.
Brahan Thomas J.
FMC Corporation
Kamp R. C.
Megley Richard B.
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