Traversing hoists – Overhead – Cable
Patent
1990-01-16
1992-03-24
Peters, Jr., Joseph F.
Traversing hoists
Overhead
Cable
212114, B66C 2100
Patent
active
050979728
ABSTRACT:
A fail-safe log skidding carriage for skyline logging operations utilizes parallel clamp assemblies for engagement of the skyline or dragline in a repeating alternating sequence. The outer ends of a pivoted crank are operably connected to the movable shoes of the two clamp assemblies to move them between operative and released clamping conditions. The crank is moved over-center with respect to a reference line perpendicular to the lines of contact between the crank and the clamp assemblies and intersecting the pivot axis of the crank, thereby preventing accidental mechanical release of a locked crank assembly should hydraulic failure occur during use of the carriage. The hydraulic system is remotely controlled through a radio receiver that sequences the hydraulic cylinder from one extreme position to the other. An overriding electrical control is provided to assure clamping of the dragline when a log or logs are lifted to the carriage.
REFERENCES:
patent: 68874 (1867-09-01), Hawley
patent: 1121742 (1914-12-01), McCay
patent: 3863774 (1975-02-01), Brandt
patent: 3948398 (1976-04-01), Christensen
patent: 4262811 (1981-04-01), Montague
patent: 4456131 (1984-06-01), Kuehn
patent: 4515281 (1985-05-01), Maki
Christy Mfg., Inc.
Peters Jr. Joseph F.
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