Anti-two block system

Details Anti-two block system Anti-two block system

B - Operations, Transporting

66

C

212/24

B66C 13/48 (2006.01)

Patent

CA 1223844

ABSTRACT OF THE DISCLOSURE 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 differ- ential 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.

433020

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