Log grapple device

Details Log grapple device Log grapple device

B - Operations, Transporting

66

C

294/19

B66C 3/18 (2006.01) B66C 3/16 (2006.01)

Patent

CA 1201142

ABSTRACT A hydraulic system (10) for a log grapple device (12), including an unloader valve (20) and an accumulator (22) located downstream of a control valve (18) which determines the direction of fluid flow to the actuating cylinder (108) controlling the opening and closing of the grapple device. When a predetermined operating pressure is reached the unloader valve diverts outlet flow from a pump (16) to a reservoir (14) and isolates the system downstream of the unloader valve, the accumulator maintaining pressure on the grapple device. When the grapple device is to be opened, a pilot check valve assembly (60) within the unloader valve permits reverse flow through the unloader valve.

410004

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