Derrick structure

Details Derrick structure Derrick structure

1996-02-05

1997-03-11

Brahan, Thomas J.

Traversing hoists

Having random condition sensor combined with an indicator or...

Sensor regulates counterweight or counterbalancing means

212198, B66C 2376

Patent

active

056092601

ABSTRACT:
An improved derrick structure comprising a column for supporting the derrick structure, a bracket horizontally rotatably mounted on the column, a boom vertically pivoted on the bracket so that the boom is divided into a first boom portion and a second boom portion, a winch drivable to hoist a hook for engaging an article intended to be transported by the derrick structure, a first dolly drivable to move the hook along the first boom portion, a counterweight drivable to move along the second boom portion to effectively balance the loading of the article hoisted by the derrick structure, and a controlling device for activating an electrical control circuit to control the driving of the winch, the dolly and the counterweight.

REFERENCES:
patent: 2453082 (1948-11-01), Allard
patent: 4067446 (1978-01-01), Ray

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