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

B - Operations, Transporting

66

F

294/19, 138/56

B66F 9/22 (2006.01) B66C 3/16 (2006.01)

Patent

CA 1205838

AUTOMATIC GRIP CONTROL CIRCUIT FOR A GRAPPLE MECHANISM ABSTRACT OF THE DISCLOSURE 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.

404816

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