Tightline apparatus for draglines

Details Tightline apparatus for draglines Tightline apparatus for draglines

1992-06-01

1993-07-13

Taylor, Dennis L.

Excavating

Snow or ice removing or grooming by portable device

Railway clearer

200332, 212149, 212153, 212167, E02F 348, E02F 920

Patent

active

052262499

ABSTRACT:
A tightline apparatus for draglines which includes a pair of mechanical safety devices, each having an engaging bar pivotally attached to a swivel frame of the dragline above each drag rope at the point where the respective drag rope extends between each set of guide rollers. A limit switch is also mounted on each fairlead frame in close proximity to the corresponding engaging bar, such that movement of the drag ropes upwardly responsive to swinging of the dragline bucket past a predetermined point toward the boom causes the drag ropes to engage the engaging bar element of each tightline apparatus and pivot the engaging bar into contact with the limit switches, respectively, to terminate operation of the dragline bucket.

REFERENCES:
patent: 4368521 (1983-01-01), Sholes
patent: 4370713 (1983-01-01), McCoy, Jr. et al.

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