Small, variable-speed yarder

Details Small, variable-speed yarder Small, variable-speed yarder

1975-10-10

1977-11-15

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

212 76, B66D 126

Patent

active

040582957

ABSTRACT:
A small, variable-speed yarder is provided with main, haulback and slack-pulling drums, each containing a planetary drive transmission with provisions for dual power inputs. A variable interlock mechanism controls the relative speed of the haulback drum to the two inhaul drums (main and slack-pulling) and a differential drive mechanism controls the relative speed and/or direction of the inhaul drums.

REFERENCES:
patent: 3107791 (1963-10-01), Michael
patent: 3405878 (1968-10-01), Lawrence

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