Lubricated rotatable log coupling for haulback line and choker

Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Cable and hook tackle

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Details

403 78, 403165, B66C 134, F16D 112

Patent

active

047238046

ABSTRACT:
A rotatable coupling is provided for connecting the haulback line ferrule of a cable yarding system to cable chokers. The coupling includes a top member and a bottom member rotatably joined along a pair of opposing flat faces which abut each other and allow rotation about only one axis. A slot in the top member includes a wide bottom cavity and a narrow top cavity which meet to form an annular shoulder against which a top face of the ferrule seats. A stop formed by the sidewall of the top member obstructs radial movement of the ferrule out of the bottom cavity when the top face of the ferrule abuts the shoulder. A lock bolt selectively supports the ferrule against the shoulder. A log bundle carried by cable chokers rotates freely with the bottom member while the top member remains stationary. The coupling thereby prevents torsional forces from being introduced into the cable by rotation of the log bundle.

REFERENCES:
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patent: 4600331 (1986-07-01), Gray

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