Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Cable and hook tackle
Patent
1995-01-17
1997-10-28
Kramer, Dean
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Cable and hook tackle
294 75, B66C 114
Patent
active
056810717
ABSTRACT:
A choker hook has a main body and a latch member rotatable relative to the main body. The latch member is biased by a spring thereby to form a pocket to hold the ferrule of a choker cable used in logging operations. The latch member has a toe piece which contacts the surface of a log when the choker hook is rotated by the choker cable relative to the log. The force between the toe piece and its attached latch member will tend to rotate the latch member relative to the main body when the effect of the force on the choker hook is such that the toe piece is brought into contact with the outside of the log. The ferrule pocket will open and the ferrule and attached cable will be released thereby releasing the log being transported without manual intervention at the point of log release.
REFERENCES:
patent: 1720069 (1929-07-01), Yeaton
patent: 1741463 (1929-12-01), Hickok
patent: 3633960 (1972-01-01), Drayton
patent: 4185863 (1980-01-01), Larson et al.
patent: 4709952 (1987-12-01), Selby
patent: 5064235 (1991-11-01), Lessard
Article entitled "Yarding made easy", by Scott Jamieson, published in the Jul./Aug. 1993 issue of Canadian Forest Industries.
Article entitled "Spreading The Word", by Scott Jamieson, published in the Jul./Aug. 1993 issue of Canadian Forest Industries.
Article entitled "Risley Slingshot, Best of both worlds", by Scott Jamieson, published in the Jun. 1993 issue of Canadian Forest Industries.
Undated publication regarding "Chokers for automatic unhooking", pp. 215-222.
Forest Engineering Research Institute of Canada
Kramer Dean
Russell Uren John
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