Development of the self-locking carriage of cuttlefish style for cable logging.

摘要

A new self-locking, mechanically functional carriage was devised and developed, for exclusive use in uphill yarding under a cable logging system consisting of a standing skyline and a main line, together with upper and lower stoppers. The carriage consists of a runner and two semicircular frames, which are connected with the runner by hinges and drawn by springs. The stoppers are movable on the skyline by release of its inside wedge, by pulling a rope from the ground. The self-locking principle depends on the relations in size among three cuttlefish shaped parts of the choker-cone and two stopper projections. The structure of the carriage is simple, its operation reliable in field tests at a felling site in Japan. The carriage accomplishes as oneoperation the process from lateral yarding to transport of the logs, and its practical use is expected soon.