B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
212/43
B66C 1/00 (2006.01)
Patent
CA 1038815
ABSTRACT OF THE DISCLOSURE A rigging arrangement and yarder are disclosed for yarding in which a single cable is used. This cable is anchored at a main storage drum on a yarder and, preferably, at an anchor in the vicinity of the tail block. The single line serves as a running skyline for supporting a carriage and includes several loops around a tram drum and an idler drum (but only one layer on said drums) which operate to hold cable or to reel equal amounts of cable in or out to both the yarder side and the anchor side of the carriage to move the carriage without introducing slack into either side. Since only a single layer of cable is wound on the tram and idler drums, no energy is lost dealing with varying speeds and torques caused by changing effective diameters, thus saving energy and weight of equipment. The yarder itself is smaller and simpler because a smaller prime mover is possible, conventional auxiliary cooling equipment for slip brakes is eliminated, the tram drums are smaller than conventional mainline drums, and certain clutches, brakes and gears are eliminated.
225761
Dargitz Larry L.
Morrow Gary R.
Skagit Corporation
LandOfFree
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