Automatic grip control circuit for a grapple mechanism

Details Automatic grip control circuit for a grapple mechanism Automatic grip control circuit for a grapple mechanism

1981-06-29

1983-08-09

Cherry, Johnny D.

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Locking device

91437, 414730, B66C 316, F15B 13042

Patent

active

043974953

ABSTRACT:
An automatic grip control circuit for a grapple mechanism providing a first pilot circuit to actuate a main hydraulic valve which operates the grapple cylinder and a second pilot circuit to actuate a grip control valve which causes excess fluid to dump to tank when the pressure is too high or directs fluid to the first pilot circuit to reactivate the main control valve to increase pressure on the grapple cylinder when the pressure is too low. The automatic grip control circuit automatically senses changes in pressure to maintain adequate gripping pressure on logs held within the grapple tongs.

REFERENCES:
patent: 3407951 (1968-10-01), Faust et al.
patent: 3627351 (1971-12-01), Zimmerman
patent: 3631989 (1972-01-01), McCormick
patent: 3854766 (1974-12-01), Jordan
patent: 3865424 (1975-02-01), Jabkowski
patent: 3905635 (1975-09-01), Esser
patent: 4201510 (1980-05-01), Muntjanoff
patent: 4313633 (1982-02-01), Muntjanoff et al.

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