Freely-movable auxiliary hoist for a gantry crane and method for

Details Freely-movable auxiliary hoist for a gantry crane and method for Freely-movable auxiliary hoist for a gantry crane and method for

1997-06-05

1999-04-13

Brahan, Thomas J.

Traversing hoists

Overhead

Surface vehicle

212316, 212326, 212330, 212336, B66C 1900

Patent

active

058934715

ABSTRACT:
A hoist assembly is provided for an overhead crane adapted for pivoting wide panels and the like between horizontal and vertical positions. The hoist assembly is supported on an elevated horizontal beam and includes a main trolley, supporting a main lifting cable, and an auxiliary trolley, supporting an auxiliary lifting cable. The main trolley is mounted for positively drivable movement along the horizontal beam, while the auxiliary trolley is freely slidable along the horizontal beam. The freely slidable auxiliary trolley automatically moves along the beam in response to a horizontal force component of cable tension when a load is being pivoted, so that the auxiliary trolley maintains a substantially vertical position over its lifting point on the load. A method for pivoting a load with the hoist assembly is also provided.

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