| 摘要 |
<p>The cable carriage is for use with a skyline log yarding system. The carriage runs and is supported on the fixed skyline . One main-haulback cable connected to winch drums at each end moves the carriage back and forth on the skyline. A tagline wound on a tagline drum is fed out as needed and is used to pull a log toward the carriage, raise it and hold it as the carriage is moved. This is accomplished by providing a pair of idler pulleys on pivoted arms, a capstan attached to the tagline drum, a skyline brake, and clutch on the capstan. The mainline hauling cable passes around one pulley then wraps around the capstan a number of times before passing over the other pulley and exiting in the opposite direction AS the haulback line. If the main line drum is braked as the haulback line is hauled in, the tension in the cable causes the idler pulleys to move inward and apply the skyline brake and release the normally engaged clutch on the capstan, and the capstan and the tagline drum then turn to reel out the tagline. Conversely, if the haulback line drum is braked as the main line is hauled in the tagline and the log attached to it are reeled in and the log raised. This having been done, tension is removed from the haulback cable thus releasing the skyline brake and locking up the tagline drum for movement of the carriage and log toward the unloading area.</p> |
