Abstract: Apparatus for securing hoist rigging comprising a first and a second polyhedral frame, and support members having two ends, wherein one end is attached to a corner of the first polyhedral frame and the second end is attached to a corner of the second polyhedral frame, so as to position the frames in a substantially parallel and superposed position.

Abstract: A slack pulling carriage having a skidding line drum arrangement that achieves efficient and accurate movement of the carriage along the skidding line. The drum arrangement is preferably configured such that the skidding line loops around at least approximately 180 degrees of the circumference of the drum. A hydraulic driving system, a multiple speed motor and locking clamps are also disclosed.

Abstract: An improved carriage for use in a skyline logging system simultaneously utilizing more than one load cable wth the same carriage for connecting to and dragging separate "turns" of logs from the area in which they were felled to a landing area next to the yarder machine.

Abstract: A carriage is provided for guided movement along a skyline and includes guide structure for supporting a dragline for longitudinal shifting relative to the carriage. A skyline stop is provided for coaction with the carriage to limit downward movement of the carriage along the skyline and latch structure is shiftably supported from the carriage for movement between applied and released positions and is spring biased toward the applied position. The latch structure is engageable with the skyline stop to prevent upward movement of the carriage along the skyline from its lower limit position established by the stop upon movement of the latch structure to the applied position. Further, abutment structure is carried by the lower end of the dragline depending downwardly from the carriage and is engageable with the latch structure for swinging the latter to its released position.

Abstract: A carriage is described for utilization along a highline for the purpose of guiding a mainline along the highline between a yarder at a landing and an anchor point along an adjacent hillside. The carriage is suspended by freewheeling sheaves on the skyline. The mainline also extends through the carriage. A highline clamp and mainline clamp are provided within the carriage and are actuated to clamp and release the highline and mainline relative to the carriage frame. Actuation is accomplished through the mainline winch at the yarder by producing tension along the mainline and by moving an abutment on the mainline against the actuator.