Railways – Traction – Cable
Patent
1995-05-26
1997-10-07
Le, Mark T.
Railways
Traction
Cable
104117, 104178, 104180, B61B 700
Patent
active
056736258
ABSTRACT:
A method and apparatus for yarding logs by introducing slack is provided for use with a mono-cable system having a continuous loop of cable strung through a logging area along a path that the harvested timber is conveyed. The invention includes advancing the mono-cable system along the path of the mono-cable system until a length of cable not being used to secure a log is available. Slack is then created in the cable of the mono-cable system, after which the cable is transported to a log located on either side and distant from the path. The choker is then secured to the log, and the hook of the choker is secured to the cable. The slack of the cable is then eliminated, such that the secured log is retrieved from its felled position distant from the path to a position adjacent the path. The cable is then advanced such that the hook of the choker is caught on a stopper of the mono-cable system, and the log is moved along the path to a transport location from which the log is removed from the logging area. The use of slack in the mono-cable system provides superior selective harvesting of trees at a logging site, reduces the labor required for retrieving such logs, increases the capacity of the mono-cable system, and reduces dangers heretofore inherent in conventional mono-cable systems caused by the height and constant tension required in the cable, while retaining the advantages of mono-cable systems over conventional line systems.
REFERENCES:
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patent: 2652157 (1953-09-01), Wyssen
patent: 3012518 (1961-12-01), Sawyer et al.
patent: 4023502 (1977-05-01), Elsing
patent: 4523525 (1985-06-01), Foster
patent: 4782761 (1988-11-01), Asberg
patent: 4920892 (1990-05-01), Pesek
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