Traversing hoists – Overhead – Cable
Patent
1975-01-27
1976-04-06
Spar, Robert J.
Traversing hoists
Overhead
Cable
188 44, 212 94, 2541391, B66C 2100
Patent
active
039483983
ABSTRACT:
A self-locking log skidding carriage for skidding logs uphill along a skyline to a powered skidding machine. The carriage includes two freely rotatable sheaves, a first for engaging a taut skyline, and a second for rotatable engagement with a dragline commonly utilized for skidding and hauling logs from one point to another. A locking wheel is positioned between the two sheaves and is actuated by members positioned on the skyline and dragline. The first actuator member on the skyline operates the locking wheel of the carriage in response to gravitational movement of the carriage down the skyline. As the carriage engages the first actuating member, the locking wheel is moved to lock the carriage to the first actuating member and to release the dragline from a previously locked position. The dragline is then free to be pulled outward from the carriage in substantially any direction to be secured to a log or group of logs. The skidding machine may then be operated to retract the dragline over the second sheave. The carriage is locked to the skyline and first actuating member, so the dragline will move over the second sheave to pull the log or logs toward the carriage. A second actuator member on the end of the dragline eventually comes into contact with the locking wheel, moving it back to its skidding position to lock the carriage to the dragline and unlock the carriage from the skyline. Once this is accomplished, the skidding machine may be utilized to pull both the carriage and engaged log up the grade to a landing.
REFERENCES:
patent: 1504753 (1924-08-01), Guerin
patent: 2649209 (1953-08-01), Wilson
Gladhart David
Oresky Lawrence J.
Spar Robert J.
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