Dual-purpose skyline log-yarding carriage

Details Dual-purpose skyline log-yarding carriage Dual-purpose skyline log-yarding carriage

1977-03-24

1978-11-28

Oresky, Lawrence J.

Traversing hoists

Overhead

Cable

212 89, 254184, B66C 2100

Patent

active

041271971

ABSTRACT:
A skyline log-yarding carriage has three drums including an in-haul drum, a haul-back drum, and a drop line drum, all interconnected for rotation in the same direction at the same time. The carriage also has a drum brake and a cable clamp, the latter for holding the carriage stationary on the skyline. The brake and clamp are applied alternately by remote control. The in-haul and haul-back drums are positioned at opposite ends of the carriage above the level of the drop-line drum. However, the haul-back drum is located slightly below the level of the in-haul drum so that a slack-pull line can pass from the underside of the haul-back drum forwardly from the carriage to a powered yarder drum in a cable passage thus created between the in-haul and drop-line drums for gravity or "shotgun" yarding. In gravity yarding the slack-pull line is used to lower the drop-line under power for attachment to a load while the brake is released and the clamp applied. The carriage can also be used for conventional skyline yarding by replacing the slack-pull cable with a haulback cable which extends from the upper side of the haul-back drum rearwardly from the carriage to a tail block anchored in the woods and then forwardly to a powered yarder drum for use in pulling the carriage along the skyline away from the yarder. In another embodiment the three carriage drums are fixed side by side to a common rotatable shaft.

REFERENCES:
patent: 3523615 (1970-08-01), Anderson et al.
patent: 3718262 (1973-02-01), Lysons et al.
patent: 3776390 (1973-12-01), Junes et al.

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