Excavator boom derrick

Details Excavator boom derrick Excavator boom derrick

1985-12-20

1987-09-15

Peters, Jr., Joseph F.

Traversing hoists

Having vertically swinging boom

And trolley

212261, 212238, 414687, B66C 2356

Patent

active

046933840

ABSTRACT:
An articulated arm-type excavator machine has a boom which has a trolley track affixed onto its underside. A trolley member from which a pulley block can be suspended travels along this track, and is urged into an operator-selected position by a double-acting hydraulic cylinder. A power winch is mounted on the overcarriage of the machine and a lifting cable runs from the winch, over the pulley block, to a lifting hook or other device.

REFERENCES:
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patent: 3977548 (1976-08-01), McCannon et al.
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patent: 4214840 (1980-07-01), Beales
patent: 4253793 (1981-03-01), Brand
patent: 4355945 (1982-10-01), Pilch
patent: 4571146 (1986-02-01), Eriksson

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