Inventors:
Don F. Schmidt - Bismarck ND
DuWayne A. Marthaller - Mandan ND
Karl Lemmerman - Bismarck ND
Dean Bray - Bismarck ND
William Lengenfelder - Bismarck ND
R. Steven Metzger - Casper WY
Assignee:
Dakota Coal Company - Bismarck ND
International Classification:
E02F 360
Abstract:
An excavator dragline bucket is supported by a hoist line from a dragline power unit, and pivots about the connection of the hoist line to the bucket. The bucket is designed to dump toward the rear, and has a gate that is latched in position during the loading of the bucket, and which will be automatically unlatched as the bucket tilts rearwardly. The gate is connected through a double pivoting bellcrank that is operated by control links connected to the hoist member such that as the angle between the bucket and the hoist member changes, the control link loads the double pivoting lever and releases the latch. When the bucket has been dumped and is returned to its horizontal position, the tailgate first moves against the rear edges of the bucket, and subsequently the double pivoting lever permits the tailgate to slide along its plane to a latched position.