Logging grapple

Details Logging grapple Logging grapple

1994-09-19

1996-09-24

Kramer, Dean

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Locking device

294106, 414730, B66C 142

Patent

active

055583806

ABSTRACT:
A grapple comprising a grapple head to which is pivotally mounted left and right tongs. Two double acting hydraulic cylinders extend between the tong pivot points and the other tong. The piston side of the hydraulic cylinders are hydraulically coupled together by a closed center flow divider valve. A cross over relief valve assembly is mounted in parallel with the flow divider valve.

REFERENCES:
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patent: 3371952 (1968-03-01), Hunger
patent: 3439818 (1969-04-01), O'Neil
patent: 3817567 (1974-06-01), Lull
patent: 3854766 (1974-12-01), Jordan
patent: 3990594 (1976-11-01), Olson et al.
patent: 4023848 (1977-05-01), Bennett
patent: 4379674 (1983-04-01), Meisel, Jr. et al.
patent: 4396215 (1983-08-01), McCutcheon
patent: 4431365 (1984-02-01), Sturtz, Jr.
patent: 4452479 (1984-06-01), Terai et al.
patent: 4542929 (1985-09-01), Possinger
patent: 4576406 (1986-03-01), Johnson et al.
patent: 4682931 (1987-07-01), House
Drawings from SUN entitled "High Capacity Flow Divider/Combiners", p. 7.15, No Date.
Drawings labelled "FS*A&FS*H Model Valves", No Date.

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